v0.6.5

app/build.gradle.kts

@@ -0,0 +1,195 @@
+import com.android.build.gradle.internal.tasks.factory.dependsOn
+import org.jlleitschuh.gradle.ktlint.reporter.ReporterType
+
+plugins {
+    alias(libs.plugins.android.application)
+    alias(libs.plugins.kotlin.android)
+    alias(libs.plugins.ktlint)
+    alias(libs.plugins.ksp)
+    alias(libs.plugins.hilt)
+    alias(libs.plugins.kotlin.serialization)
+    alias(libs.plugins.kotlin.parcelize)
+}
+
+android {
+    val latestVersionName = "0.6.5"
+    namespace = "com.looker.droidify"
+    buildToolsVersion = "35.0.0"
+    compileSdk = 35
+    defaultConfig {
+        minSdk = 23
+        targetSdk = 35
+        applicationId = "com.looker.droidify"
+        versionCode = 650
+        versionName = latestVersionName
+        vectorDrawables.useSupportLibrary = false
+        testInstrumentationRunner = "androidx.test.runner.AndroidJUnitRunner"
+    }
+
+    compileOptions {
+        sourceCompatibility = JavaVersion.VERSION_17
+        targetCompatibility = JavaVersion.VERSION_17
+        isCoreLibraryDesugaringEnabled = true
+    }
+
+    kotlinOptions {
+        jvmTarget = "17"
+        freeCompilerArgs = listOf(
+            "-opt-in=kotlin.RequiresOptIn",
+            "-opt-in=kotlinx.coroutines.ExperimentalCoroutinesApi",
+            "-opt-in=kotlinx.coroutines.FlowPreview",
+            "-Xcontext-receivers"
+        )
+    }
+
+    androidResources {
+        generateLocaleConfig = true
+    }
+
+    sourceSets.forEach { source ->
+        val javaDir = source.java.srcDirs.find { it.name == "java" }
+        source.java {
+            srcDir(File(javaDir?.parentFile, "kotlin"))
+        }
+    }
+
+    buildTypes {
+        debug {
+            applicationIdSuffix = ".debug"
+            resValue("string", "application_name", "Droid-ify-Debug")
+        }
+        release {
+            isMinifyEnabled = true
+            isShrinkResources = true
+            resValue("string", "application_name", "Droid-ify")
+            proguardFiles(
+                getDefaultProguardFile("proguard-android-optimize.txt"),
+                "proguard.pro"
+            )
+        }
+        create("alpha") {
+            initWith(getByName("debug"))
+            applicationIdSuffix = ".alpha"
+            resValue("string", "application_name", "Droid-ify Alpha")
+            proguardFiles(
+                getDefaultProguardFile("proguard-android-optimize.txt"),
+                "proguard.pro"
+            )
+            isDebuggable = true
+            isMinifyEnabled = true
+        }
+        all {
+            buildConfigField(
+                type = "String",
+                name = "VERSION_NAME",
+                value = "\"v$latestVersionName\""
+            )
+        }
+    }
+    packaging {
+        resources {
+            excludes += listOf(
+                "/DebugProbesKt.bin",
+                "/kotlin/**.kotlin_builtins",
+                "/kotlin/**.kotlin_metadata",
+                "/META-INF/**.kotlin_module",
+                "/META-INF/**.pro",
+                "/META-INF/**.version",
+                "/META-INF/{AL2.0,LGPL2.1,LICENSE*}",
+                "/META-INF/versions/9/previous-**.bin",
+            )
+        }
+    }
+    buildFeatures {
+        resValues = true
+        viewBinding = true
+        buildConfig = true
+    }
+    dependenciesInfo {
+        includeInApk = false
+        includeInBundle = false
+    }
+}
+
+ktlint {
+    android.set(true)
+    ignoreFailures.set(true)
+    debug.set(true)
+    reporters {
+        reporter(ReporterType.HTML)
+    }
+    filter {
+        exclude("**/generated/**")
+    }
+}
+
+dependencies {
+    coreLibraryDesugaring(libs.desugaring)
+
+    implementation(libs.material)
+    implementation(libs.core.ktx)
+    implementation(libs.activity)
+    implementation(libs.appcompat)
+    implementation(libs.fragment.ktx)
+    implementation(libs.lifecycle.viewModel)
+    implementation(libs.recyclerview)
+    implementation(libs.sqlite.ktx)
+
+    implementation(libs.image.viewer)
+    implementation(libs.bundles.coil)
+
+    implementation(libs.datastore.core)
+    implementation(libs.datastore.proto)
+
+    implementation(libs.kotlin.stdlib)
+    implementation(libs.datetime)
+
+    implementation(libs.coroutines.core)
+    implementation(libs.coroutines.android)
+    implementation(libs.coroutines.guava)
+
+    implementation(libs.libsu.core)
+    implementation(libs.shizuku.api)
+    api(libs.shizuku.provider)
+
+    implementation(libs.jackson.core)
+    implementation(libs.serialization)
+
+    implementation(libs.ktor.core)
+    implementation(libs.ktor.okhttp)
+
+    implementation(libs.work.ktx)
+
+    implementation(libs.hilt.core)
+    implementation(libs.hilt.android)
+    implementation(libs.hilt.ext.work)
+    ksp(libs.hilt.compiler)
+    ksp(libs.hilt.ext.compiler)
+
+    testImplementation(platform(libs.junit.bom))
+    testImplementation(libs.bundles.test.unit)
+    testRuntimeOnly(libs.junit.platform)
+    androidTestImplementation(platform(libs.junit.bom))
+    androidTestImplementation(libs.bundles.test.android)
+
+//    debugImplementation(libs.leakcanary)
+}
+
+// using a task as a preBuild dependency instead of a function that takes some time insures that it runs
+task("detectAndroidLocals") {
+    val langsList: MutableSet<String> = HashSet()
+
+    // in /res are (almost) all languages that have a translated string is saved. this is safer and saves some time
+    fileTree("src/main/res").visit {
+        if (this.file.path.endsWith("strings.xml") &&
+            this.file.canonicalFile.readText().contains("<string")
+        ) {
+            var languageCode = this.file.parentFile.name.replace("values-", "")
+            languageCode = if (languageCode == "values") "en" else languageCode
+            langsList.add(languageCode)
+        }
+    }
+    val langsListString = "{${langsList.sorted().joinToString(",") { "\"${it}\"" }}}"
+    android.defaultConfig.buildConfigField("String[]", "DETECTED_LOCALES", langsListString)
+}
+tasks.preBuild.dependsOn("detectAndroidLocals")

app/proguard.pro

@@ -0,0 +1,9 @@
+-dontobfuscate
+
+# Disable ServiceLoader reproducibility-breaking optimizations
+-keep class kotlinx.coroutines.CoroutineExceptionHandler
+-keep class kotlinx.coroutines.internal.MainDispatcherFactory
+
+-dontwarn kotlinx.serialization.KSerializer
+-dontwarn kotlinx.serialization.Serializable
+-dontwarn org.slf4j.impl.StaticLoggerBinder

app/src/androidTest/assets/izzy_entry.json

@@ -0,0 +1 @@
+{"timestamp": 1725903808000, "version": 20002, "index": {"name": "/index-v2.json", "sha256": "5c5d5b6495efd95c0e7b849df4f1411b6337272cdee2b28defc4eb0f1c4bae42", "size": 7134576, "numPackages": 1201}, "diffs": {"1725491992000": {"name": "/diff/1725491992000.json", "sha256": "58b2633fd72a8b517a69354f15ee88d028c55c92b4122158f0dd63cca82ff37b", "size": 220333, "numPackages": 55}, "1725492213000": {"name": "/diff/1725492213000.json", "sha256": "7aa22b070d9f6f77fd069cab7fdbb38aa9f734d01982d9b9fadb3560807367ff", "size": 218833, "numPackages": 55}, "1725558218000": {"name": "/diff/1725558218000.json", "sha256": "cfae51610c44ec8dd73f390f7af46f71ebf4b2233151ec2f40f8c403775d815b", "size": 208567, "numPackages": 54}, "1725581280000": {"name": "/diff/1725581280000.json", "sha256": "9c5e39cc363e2a98c35fab6ec389f6b1a272fb92298c8f7f8eb158ba5ad3f7b1", "size": 207136, "numPackages": 48}, "1725645028000": {"name": "/diff/1725645028000.json", "sha256": "996c8e982e21dbdbcf25424ea4d3f32a7b67f7eea249db2392ea31a2bef033f6", "size": 98678, "numPackages": 47}, "1725731263000": {"name": "/diff/1725731263000.json", "sha256": "5dd06ef6da469b3881933b076ca0d989372477300b1f43070ae6b041763539da", "size": 80050, "numPackages": 37}, "1725746579000": {"name": "/diff/1725746579000.json", "sha256": "8bb1c009b828a3cecaa8180c08ac7a81b51c2d8b036566ec08fb7159dc61127a", "size": 58098, "numPackages": 31}, "1725807608000": {"name": "/diff/1725807608000.json", "sha256": "95ffb733c6e1e839f18c90e1cc704e554b0ae0eb26b52f0cf6437ee7a91ec96e", "size": 53358, "numPackages": 30}, "1725817837000": {"name": "/diff/1725817837000.json", "sha256": "21fed03d9e1b89cc2c4753084bcf49b681b4e4219375d9fdb5db1dd48a9a2fd3", "size": 16366, "numPackages": 28}, "1725885326000": {"name": "/diff/1725885326000.json", "sha256": "f2f22d1a56262276e07c68d5d71a149a50ddfa8c47b82bb3b63e0077f58121b6", "size": 13324, "numPackages": 9}}}

app/src/androidTest/kotlin/com/looker/droidify/index/RepositoryUpdaterTest.kt

@@ -0,0 +1,92 @@
+package com.looker.droidify.index
+
+import android.content.Context
+import androidx.test.ext.junit.runners.AndroidJUnit4
+import androidx.test.filters.SmallTest
+import androidx.test.platform.app.InstrumentationRegistry
+import com.looker.droidify.model.Repository
+import org.junit.Before
+import org.junit.Test
+import org.junit.runner.RunWith
+import java.io.File
+import kotlin.math.sqrt
+import kotlin.system.measureTimeMillis
+
+@RunWith(AndroidJUnit4::class)
+@SmallTest
+class RepositoryUpdaterTest {
+
+    private lateinit var context: Context
+    private lateinit var repository: Repository
+
+    @Before
+    fun setup() {
+        context = InstrumentationRegistry.getInstrumentation().context
+        repository = Repository(
+            id = 15,
+            address = "https://apt.izzysoft.de/fdroid/repo",
+            mirrors = emptyList(),
+            name = "IzzyOnDroid F-Droid Repo",
+            description = "",
+            version = 20002,
+            enabled = true,
+            fingerprint = "3BF0D6ABFEAE2F401707B6D966BE743BF0EEE49C2561B9BA39073711F628937A",
+            lastModified = "",
+            entityTag = "",
+            updated = 1735315749835,
+            timestamp = 1725352450000,
+            authentication = "",
+        )
+    }
+
+    @Test
+    fun processFile() {
+        testRepetition(1) {
+            val createFile = File.createTempFile("index", "entry")
+            val mergerFile = File.createTempFile("index", "merger")
+            val jarStream = context.resources.assets.open("index-v1.jar")
+            jarStream.copyTo(createFile.outputStream())
+            process(createFile, mergerFile)
+        }
+    }
+
+    private fun process(file: File, merger: File) = measureTimeMillis {
+        RepositoryUpdater.processFile(
+            context = context,
+            repository = repository,
+            indexType = RepositoryUpdater.IndexType.INDEX_V1,
+            unstable = false,
+            file = file,
+            mergerFile = merger,
+            lastModified = "",
+            entityTag = "",
+            callback = { stage, current, total ->
+
+            },
+        )
+    }
+
+    private inline fun testRepetition(repetition: Int, block: () -> Long) {
+        val times = (1..repetition).map {
+            System.gc()
+            System.runFinalization()
+            block().toDouble()
+        }
+        val meanAndDeviation = times.culledMeanAndDeviation()
+        println(times)
+        println("${meanAndDeviation.first} ± ${meanAndDeviation.second}")
+    }
+}
+
+private fun List<Double>.culledMeanAndDeviation(): Pair<Double, Double> = when {
+    isEmpty() -> Double.NaN to Double.NaN
+    size == 1 || size == 2 -> this.meanAndDeviation()
+    else -> sorted().subList(1, size - 1).meanAndDeviation()
+}
+
+private fun List<Double>.meanAndDeviation(): Pair<Double, Double> {
+    val mean = average()
+    return mean to sqrt(fold(0.0) { acc, value -> acc + (value - mean).squared() } / size)
+}
+
+private fun Double.squared() = this * this

app/src/androidTest/kotlin/com/looker/droidify/sync/Downloader.kt

@@ -0,0 +1,68 @@
+package com.looker.droidify.sync
+
+import com.looker.droidify.network.Downloader
+import com.looker.droidify.network.NetworkResponse
+import com.looker.droidify.network.ProgressListener
+import com.looker.droidify.network.header.HeadersBuilder
+import com.looker.droidify.network.validation.FileValidator
+import com.looker.droidify.sync.common.assets
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.ensureActive
+import kotlinx.coroutines.withContext
+import java.io.File
+import java.io.InputStream
+import java.net.Proxy
+
+val FakeDownloader = object : Downloader {
+    override fun setProxy(proxy: Proxy) {
+        TODO("Not yet implemented")
+    }
+
+    override suspend fun headCall(
+        url: String,
+        headers: HeadersBuilder.() -> Unit
+    ): NetworkResponse {
+        TODO("Not yet implemented")
+    }
+
+    override suspend fun downloadToFile(
+        url: String,
+        target: File,
+        validator: FileValidator?,
+        headers: HeadersBuilder.() -> Unit,
+        block: ProgressListener?
+    ): NetworkResponse {
+        return if (url.endsWith("fail")) NetworkResponse.Error.Unknown(Exception("You asked for it"))
+        else {
+            val index = when {
+                url.endsWith("fdroid-index-v1.jar") -> assets("fdroid_index_v1.jar")
+                url.endsWith("fdroid-index-v1.json") -> assets("fdroid_index_v1.json")
+                url.endsWith("fdroid-index-v2.json") -> assets("fdroid_index_v2.json")
+                url.endsWith("index-v1.jar") -> assets("izzy_index_v1.jar")
+                url.endsWith("index-v2.json") -> assets("izzy_index_v2.json")
+                url.endsWith("index-v2-updated.json") -> assets("izzy_index_v2_updated.json")
+                url.endsWith("entry.jar") -> assets("izzy_entry.jar")
+                url.endsWith("/diff/1725731263000.json") -> assets("izzy_diff.json")
+                // Just in case we try these in future
+                url.endsWith("index-v1.json") -> assets("izzy_index_v1.json")
+                url.endsWith("entry.json") -> assets("izzy_entry.json")
+                else -> error("Unknown URL: $url")
+            }
+            index.writeTo(target)
+            NetworkResponse.Success(200, null, null)
+        }
+    }
+
+    suspend infix fun InputStream.writeTo(file: File) = withContext(Dispatchers.IO) {
+        val buffer = ByteArray(DEFAULT_BUFFER_SIZE)
+        var bytesRead = read(buffer)
+        file.outputStream().use { output ->
+            while (bytesRead != -1) {
+                ensureActive()
+                output.write(buffer, 0, bytesRead)
+                bytesRead = read(buffer)
+            }
+            output.flush()
+        }
+    }
+}

app/src/androidTest/kotlin/com/looker/droidify/sync/EntrySyncableTest.kt

@@ -0,0 +1,130 @@
+package com.looker.droidify.sync
+
+import android.content.Context
+import androidx.test.ext.junit.runners.AndroidJUnit4
+import androidx.test.platform.app.InstrumentationRegistry
+import com.looker.droidify.domain.model.Repo
+import com.looker.droidify.sync.common.IndexJarValidator
+import com.looker.droidify.sync.common.Izzy
+import com.looker.droidify.sync.common.JsonParser
+import com.looker.droidify.sync.common.assets
+import com.looker.droidify.sync.common.downloadIndex
+import com.looker.droidify.sync.common.benchmark
+import com.looker.droidify.sync.v2.EntryParser
+import com.looker.droidify.sync.v2.EntrySyncable
+import com.looker.droidify.sync.v2.model.Entry
+import com.looker.droidify.sync.v2.model.IndexV2
+import kotlinx.coroutines.CoroutineDispatcher
+import kotlinx.coroutines.test.StandardTestDispatcher
+import kotlinx.coroutines.test.runTest
+import kotlinx.serialization.ExperimentalSerializationApi
+import kotlinx.serialization.json.decodeFromStream
+import org.junit.Before
+import org.junit.runner.RunWith
+import kotlin.system.measureTimeMillis
+import kotlin.test.Test
+import kotlin.test.assertContentEquals
+import kotlin.test.assertEquals
+
+@RunWith(AndroidJUnit4::class)
+class EntrySyncableTest {
+
+    private lateinit var dispatcher: CoroutineDispatcher
+    private lateinit var context: Context
+    private lateinit var syncable: Syncable<Entry>
+    private lateinit var parser: Parser<Entry>
+    private lateinit var validator: IndexValidator
+    private lateinit var repo: Repo
+    private lateinit var newIndex: IndexV2
+
+    /**
+     * In this particular test 1 package is removed and 36 packages are updated
+     */
+
+    @OptIn(ExperimentalSerializationApi::class)
+    @Before
+    fun before() {
+        context = InstrumentationRegistry.getInstrumentation().context
+        dispatcher = StandardTestDispatcher()
+        validator = IndexJarValidator(dispatcher)
+        parser = EntryParser(dispatcher, JsonParser, validator)
+        syncable = EntrySyncable(context, FakeDownloader, dispatcher)
+        newIndex = JsonParser.decodeFromStream<IndexV2>(assets("izzy_index_v2_updated.json"))
+        repo = Izzy
+    }
+
+    @Test
+    fun benchmark_sync_full() = runTest(dispatcher) {
+        val output = benchmark(10) {
+            measureTimeMillis { syncable.sync(repo) }
+        }
+        println(output)
+    }
+
+    @Test
+    fun benchmark_entry_parser() = runTest(dispatcher) {
+        val output = benchmark(10) {
+            measureTimeMillis {
+                parser.parse(
+                    file = FakeDownloader.downloadIndex(
+                        context = context,
+                        repo = repo,
+                        fileName = "izzy",
+                        url = "entry.jar"
+                    ),
+                    repo = repo
+                )
+            }
+        }
+        println(output)
+    }
+
+    @Test
+    fun check_if_patch_applies() = runTest(dispatcher) {
+        // Downloads old index file as the index file does not exist
+        val (fingerprint1, index1) = syncable.sync(repo)
+        assert(index1 != null)
+        // Downloads the diff as the index file exists and is older than entry version
+        val (fingerprint2, index2) = syncable.sync(
+            repo.copy(
+                versionInfo = repo.versionInfo.copy(
+                    timestamp = index1!!.repo.timestamp
+                )
+            )
+        )
+        assert(index2 != null)
+        // Does not download anything
+        val (fingerprint3, index3) = syncable.sync(
+            repo.copy(
+                versionInfo = repo.versionInfo.copy(
+                    timestamp = index2!!.repo.timestamp
+                )
+            )
+        )
+        assert(index3 == null)
+
+        // Check if all the packages are same
+        assertContentEquals(newIndex.packages.keys.sorted(), index2.packages.keys.sorted())
+        // Check if all the version hashes are same
+        assertContentEquals(
+            newIndex.packages.values.flatMap { it.versions.keys }.sorted(),
+            index2.packages.values.flatMap { it.versions.keys }.sorted(),
+        )
+
+        // Check if repo antifeatures are same
+        assertContentEquals(
+            newIndex.repo.antiFeatures.keys.sorted(),
+            index2.repo.antiFeatures.keys.sorted()
+        )
+
+        // Check if repo categories are same
+        assertContentEquals(
+            newIndex.repo.categories.keys.sorted(),
+            index2.repo.categories.keys.sorted()
+        )
+
+        assertEquals(fingerprint1, fingerprint2)
+        assertEquals(fingerprint2, fingerprint3)
+    }
+
+}

app/src/androidTest/kotlin/com/looker/droidify/sync/IndexValidator.kt

@@ -0,0 +1,13 @@
+package com.looker.droidify.sync
+
+import com.looker.droidify.domain.model.Fingerprint
+import java.util.jar.JarEntry
+
+val FakeIndexValidator = object : IndexValidator {
+    override suspend fun validate(
+        jarEntry: JarEntry,
+        expectedFingerprint: Fingerprint?
+    ): Fingerprint {
+        return expectedFingerprint ?: Fingerprint("0".repeat(64))
+    }
+}

app/src/androidTest/kotlin/com/looker/droidify/sync/V1SyncableTest.kt

@@ -0,0 +1,308 @@
+package com.looker.droidify.sync
+
+import android.content.Context
+import androidx.test.ext.junit.runners.AndroidJUnit4
+import androidx.test.platform.app.InstrumentationRegistry
+import com.looker.droidify.domain.model.Repo
+import com.looker.droidify.sync.common.IndexJarValidator
+import com.looker.droidify.sync.common.Izzy
+import com.looker.droidify.sync.common.JsonParser
+import com.looker.droidify.sync.common.downloadIndex
+import com.looker.droidify.sync.common.benchmark
+import com.looker.droidify.sync.common.toV2
+import com.looker.droidify.sync.v1.V1Parser
+import com.looker.droidify.sync.v1.V1Syncable
+import com.looker.droidify.sync.v1.model.IndexV1
+import com.looker.droidify.sync.v2.V2Parser
+import com.looker.droidify.sync.v2.model.FileV2
+import com.looker.droidify.sync.v2.model.IndexV2
+import com.looker.droidify.sync.v2.model.MetadataV2
+import com.looker.droidify.sync.v2.model.VersionV2
+import kotlinx.coroutines.CoroutineDispatcher
+import kotlinx.coroutines.test.StandardTestDispatcher
+import kotlinx.coroutines.test.runTest
+import org.junit.Before
+import org.junit.runner.RunWith
+import kotlin.system.measureTimeMillis
+import kotlin.test.Test
+import kotlin.test.assertContentEquals
+import kotlin.test.assertEquals
+import kotlin.test.assertNotNull
+
+@RunWith(AndroidJUnit4::class)
+class V1SyncableTest {
+
+    private lateinit var dispatcher: CoroutineDispatcher
+    private lateinit var context: Context
+    private lateinit var syncable: Syncable<IndexV1>
+    private lateinit var parser: Parser<IndexV1>
+    private lateinit var v2Parser: Parser<IndexV2>
+    private lateinit var validator: IndexValidator
+    private lateinit var repo: Repo
+
+    @Before
+    fun before() {
+        context = InstrumentationRegistry.getInstrumentation().context
+        dispatcher = StandardTestDispatcher()
+        validator = IndexJarValidator(dispatcher)
+        parser = V1Parser(dispatcher, JsonParser, validator)
+        v2Parser = V2Parser(dispatcher, JsonParser)
+        syncable = V1Syncable(context, FakeDownloader, dispatcher)
+        repo = Izzy
+    }
+
+    @Test
+    fun benchmark_sync_v1() = runTest(dispatcher) {
+        val output = benchmark(10) {
+            measureTimeMillis { syncable.sync(repo) }
+        }
+        println(output)
+    }
+
+    @Test
+    fun benchmark_v1_parser() = runTest(dispatcher) {
+        val file = FakeDownloader.downloadIndex(context, repo, "izzy", "index-v1.jar")
+        val output = benchmark(10) {
+            measureTimeMillis {
+                parser.parse(
+                    file = file,
+                    repo = repo
+                )
+            }
+        }
+        println(output)
+    }
+
+    @Test
+    fun benchmark_v1_vs_v2_parser() = runTest(dispatcher) {
+        val v1File = FakeDownloader.downloadIndex(context, repo, "izzy-v1", "index-v1.jar")
+        val v2File = FakeDownloader.downloadIndex(context, repo, "izzy-v2", "index-v2.json")
+        val output1 = benchmark(10) {
+            measureTimeMillis {
+                parser.parse(
+                    file = v1File,
+                    repo = repo
+                )
+            }
+        }
+        val output2 = benchmark(10) {
+            measureTimeMillis {
+                parser.parse(
+                    file = v2File,
+                    repo = repo,
+                )
+            }
+        }
+        println(output1)
+        println(output2)
+    }
+
+    @Test
+    fun v1tov2() = runTest(dispatcher) {
+        testIndexConversion("index-v1.jar", "index-v2-updated.json")
+    }
+
+    // @Test
+    fun v1tov2FDroidRepo() = runTest(dispatcher) {
+        testIndexConversion("fdroid-index-v1.jar", "fdroid-index-v2.json")
+    }
+
+    private suspend fun testIndexConversion(
+        v1: String,
+        v2: String,
+        targeted: String? = null,
+    ) {
+        val fileV1 = FakeDownloader.downloadIndex(context, repo, "data-v1", v1)
+        val fileV2 = FakeDownloader.downloadIndex(context, repo, "data-v2", v2)
+        val (fingerV1, foundIndexV1) = parser.parse(fileV1, repo)
+        val (fingerV2, expectedIndex) = v2Parser.parse(fileV2, repo)
+        val foundIndex = foundIndexV1.toV2()
+        assertEquals(fingerV2, fingerV1)
+        assertNotNull(foundIndex)
+        assertNotNull(expectedIndex)
+        assertEquals(expectedIndex.repo.timestamp, foundIndex.repo.timestamp)
+        assertEquals(expectedIndex.packages.size, foundIndex.packages.size)
+        assertContentEquals(
+            expectedIndex.packages.keys.sorted(),
+            foundIndex.packages.keys.sorted(),
+        )
+        if (targeted == null) {
+            expectedIndex.packages.keys.forEach { key ->
+                val expectedPackage = expectedIndex.packages[key]
+                val foundPackage = foundIndex.packages[key]
+
+                println("**".repeat(25))
+                println("Testing: ${expectedPackage?.metadata?.name?.get("en-US")} <$key>")
+
+                assertNotNull(expectedPackage)
+                assertNotNull(foundPackage)
+                assertMetadata(expectedPackage.metadata, foundPackage.metadata)
+                assertVersion(expectedPackage.versions, foundPackage.versions)
+            }
+        } else {
+            val expectedPackage = expectedIndex.packages[targeted]
+            val foundPackage = foundIndex.packages[targeted]
+
+            println("**".repeat(25))
+            println("Testing: ${expectedPackage?.metadata?.name?.get("en-US")} <$targeted>")
+
+            assertNotNull(expectedPackage)
+            assertNotNull(foundPackage)
+            assertMetadata(expectedPackage.metadata, foundPackage.metadata)
+            assertVersion(expectedPackage.versions, foundPackage.versions)
+        }
+    }
+}
+
+/*
+* Cannot assert following:
+* - `name` => because fdroidserver behaves weirdly
+* */
+private fun assertMetadata(expectedMetaData: MetadataV2, foundMetadata: MetadataV2) {
+    assertEquals(expectedMetaData.preferredSigner, foundMetadata.preferredSigner)
+//    assertLocalizedString(expectedMetaData.name, foundMetadata.name)
+    assertLocalizedString(expectedMetaData.summary, foundMetadata.summary)
+    assertLocalizedString(expectedMetaData.description, foundMetadata.description)
+    assertContentEquals(expectedMetaData.categories, foundMetadata.categories)
+    // Update
+    assertEquals(expectedMetaData.changelog, foundMetadata.changelog)
+    assertEquals(expectedMetaData.added, foundMetadata.added)
+    assertEquals(expectedMetaData.lastUpdated, foundMetadata.lastUpdated)
+    // Author
+    assertEquals(expectedMetaData.authorEmail, foundMetadata.authorEmail)
+    assertEquals(expectedMetaData.authorName, foundMetadata.authorName)
+    assertEquals(expectedMetaData.authorPhone, foundMetadata.authorPhone)
+    assertEquals(expectedMetaData.authorWebSite, foundMetadata.authorWebSite)
+    // Donate
+    assertEquals(expectedMetaData.bitcoin, foundMetadata.bitcoin)
+    assertEquals(expectedMetaData.liberapay, foundMetadata.liberapay)
+    assertEquals(expectedMetaData.flattrID, foundMetadata.flattrID)
+    assertEquals(expectedMetaData.openCollective, foundMetadata.openCollective)
+    assertEquals(expectedMetaData.litecoin, foundMetadata.litecoin)
+    assertContentEquals(expectedMetaData.donate, foundMetadata.donate)
+    // Source
+    assertEquals(expectedMetaData.translation, foundMetadata.translation)
+    assertEquals(expectedMetaData.issueTracker, foundMetadata.issueTracker)
+    assertEquals(expectedMetaData.license, foundMetadata.license)
+    assertEquals(expectedMetaData.sourceCode, foundMetadata.sourceCode)
+    // Graphics
+    assertLocalizedString(expectedMetaData.video, foundMetadata.video)
+    assertLocalized(expectedMetaData.icon, foundMetadata.icon) { expected, found ->
+        assertEquals(expected.name, found.name)
+    }
+    assertLocalized(expectedMetaData.promoGraphic, foundMetadata.promoGraphic) { expected, found ->
+        assertEquals(expected.name, found.name)
+    }
+    assertLocalized(expectedMetaData.tvBanner, foundMetadata.tvBanner) { expected, found ->
+        assertEquals(expected.name, found.name)
+    }
+    assertLocalized(
+        expectedMetaData.featureGraphic,
+        foundMetadata.featureGraphic
+    ) { expected, found ->
+        assertEquals(expected.name, found.name)
+    }
+    assertLocalized(
+        expectedMetaData.screenshots?.phone,
+        foundMetadata.screenshots?.phone
+    ) { expected, found ->
+        assertFiles(expected, found)
+    }
+    assertLocalized(
+        expectedMetaData.screenshots?.sevenInch,
+        foundMetadata.screenshots?.sevenInch
+    ) { expected, found ->
+        assertFiles(expected, found)
+    }
+    assertLocalized(
+        expectedMetaData.screenshots?.tenInch,
+        foundMetadata.screenshots?.tenInch
+    ) { expected, found ->
+        assertFiles(expected, found)
+    }
+    assertLocalized(
+        expectedMetaData.screenshots?.tv,
+        foundMetadata.screenshots?.tv
+    ) { expected, found ->
+        assertFiles(expected, found)
+    }
+    assertLocalized(
+        expectedMetaData.screenshots?.wear,
+        foundMetadata.screenshots?.wear
+    ) { expected, found ->
+        assertFiles(expected, found)
+    }
+}
+
+/*
+* Cannot assert following:
+* - `whatsNew` => we added same changelog to all versions
+* - `antiFeatures` => anti features are now version specific
+* */
+private fun assertVersion(
+    expected: Map<String, VersionV2>,
+    found: Map<String, VersionV2>,
+) {
+    assertEquals(expected.keys.size, found.keys.size)
+    assertContentEquals(expected.keys.sorted(), found.keys.sorted().asIterable())
+    expected.keys.forEach { versionHash ->
+        val expectedVersion = expected[versionHash]
+        val foundVersion = found[versionHash]
+        assertNotNull(expectedVersion)
+        assertNotNull(foundVersion)
+
+        assertEquals(expectedVersion.added, foundVersion.added)
+        assertEquals(expectedVersion.file.name, foundVersion.file.name)
+        assertEquals(expectedVersion.src?.name, foundVersion.src?.name)
+
+        val expectedMan = expectedVersion.manifest
+        val foundMan = foundVersion.manifest
+
+        assertEquals(expectedMan.versionCode, foundMan.versionCode)
+        assertEquals(expectedMan.versionName, foundMan.versionName)
+        assertEquals(expectedMan.maxSdkVersion, foundMan.maxSdkVersion)
+        assertEquals(expectedMan.usesSdk, foundMan.usesSdk)
+
+        assertContentEquals(
+            expectedMan.features.sortedBy { it.name },
+            foundMan.features.sortedBy { it.name },
+        )
+        assertContentEquals(expectedMan.usesPermission, foundMan.usesPermission)
+        assertContentEquals(expectedMan.usesPermissionSdk23, foundMan.usesPermissionSdk23)
+        assertContentEquals(expectedMan.signer?.sha256?.sorted(), foundMan.signer?.sha256?.sorted())
+        assertContentEquals(expectedMan.nativecode.sorted(), foundMan.nativecode.sorted())
+    }
+}
+
+private fun assertLocalizedString(
+    expected: Map<String, String>?,
+    found: Map<String, String>?,
+    message: String? = null,
+) {
+    assertLocalized(expected, found) { one, two ->
+        assertEquals(one, two, message)
+    }
+}
+
+private fun <T> assertLocalized(
+    expected: Map<String, T>?,
+    found: Map<String, T>?,
+    block: (expected: T, found: T) -> Unit,
+) {
+    if (expected == null || found == null) {
+        assertEquals(expected, found)
+        return
+    }
+    assertNotNull(expected)
+    assertNotNull(found)
+    assertEquals(expected.size, found.size)
+    assertContentEquals(expected.keys.sorted(), found.keys.sorted().asIterable())
+    expected.keys.forEach {
+        if (expected[it] != null && found[it] != null) block(expected[it]!!, found[it]!!)
+    }
+}
+
+private fun assertFiles(expected: List<FileV2>, found: List<FileV2>, message: String? = null) {
+    // Only check name, because we cannot add sha to old index
+    assertContentEquals(expected.map { it.name }, found.map { it.name }.asIterable(), message)
+}

app/src/androidTest/kotlin/com/looker/droidify/sync/common/Benchmark.kt

@@ -0,0 +1,43 @@
+package com.looker.droidify.sync.common
+
+import kotlin.math.pow
+import kotlin.math.sqrt
+
+internal inline fun benchmark(
+    repetition: Int,
+    extraMessage: String? = null,
+    block: () -> Long,
+): String {
+    if (extraMessage != null) {
+        println("=".repeat(50))
+        println(extraMessage)
+        println("=".repeat(50))
+    }
+    val times = DoubleArray(repetition)
+    repeat(repetition) { iteration ->
+        System.gc()
+        System.runFinalization()
+        times[iteration] = block().toDouble()
+    }
+    val meanAndDeviation = times.culledMeanAndDeviation()
+    return buildString {
+        append("=".repeat(50))
+        append("\n")
+        append(times.joinToString(" | "))
+        append("\n")
+        append("${meanAndDeviation.first} ms ± ${meanAndDeviation.second.toFloat()} ms")
+        append("\n")
+        append("=".repeat(50))
+        append("\n")
+    }
+}
+
+private fun DoubleArray.culledMeanAndDeviation(): Pair<Double, Double> {
+    sort()
+    return meanAndDeviation()
+}
+
+private fun DoubleArray.meanAndDeviation(): Pair<Double, Double> {
+    val mean = average()
+    return mean to sqrt(fold(0.0) { acc, value -> acc + (value - mean).pow(2) } / size)
+}

app/src/androidTest/kotlin/com/looker/droidify/sync/common/Repo.kt

@@ -0,0 +1,20 @@
+package com.looker.droidify.sync.common
+
+import com.looker.droidify.domain.model.Authentication
+import com.looker.droidify.domain.model.Fingerprint
+import com.looker.droidify.domain.model.Repo
+import com.looker.droidify.domain.model.VersionInfo
+
+val Izzy = Repo(
+    id = 1L,
+    enabled = true,
+    address = "https://apt.izzysoft.de/fdroid/repo",
+    name = "IzzyOnDroid F-Droid Repo",
+    description = "This is a repository of apps to be used with F-Droid. Applications in this repository are official binaries built by the original application developers, taken from their resp. repositories (mostly Github, GitLab, Codeberg). Updates for the apps are usually fetched daily, and you can expect daily index updates.",
+    fingerprint = Fingerprint("3BF0D6ABFEAE2F401707B6D966BE743BF0EEE49C2561B9BA39073711F628937A"),
+    authentication = Authentication("", ""),
+    versionInfo = VersionInfo(0L, null),
+    mirrors = emptyList(),
+    antiFeatures = emptyList(),
+    categories = emptyList(),
+)

app/src/androidTest/kotlin/com/looker/droidify/sync/common/Resource.kt

@@ -0,0 +1,8 @@
+package com.looker.droidify.sync.common
+
+import androidx.test.platform.app.InstrumentationRegistry
+import java.io.InputStream
+
+fun assets(name: String): InputStream {
+    return InstrumentationRegistry.getInstrumentation().context.assets.open(name)
+}

app/src/main/AndroidManifest.xml

@@ -0,0 +1,188 @@
+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:tools="http://schemas.android.com/tools">
+
+    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
+    <uses-permission android:name="android.permission.INTERNET" />
+    <uses-permission android:name="android.permission.FOREGROUND_SERVICE" />
+    <uses-permission android:name="android.permission.FOREGROUND_SERVICE_DATA_SYNC" />
+    <uses-permission android:name="android.permission.POST_NOTIFICATIONS" />
+    <uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />
+    <uses-permission android:name="android.permission.REQUEST_INSTALL_PACKAGES" />
+    <uses-permission android:name="android.permission.REQUEST_DELETE_PACKAGES" />
+    <uses-permission android:name="android.permission.RUN_USER_INITIATED_JOBS" />
+    <uses-permission android:name="android.permission.UPDATE_PACKAGES_WITHOUT_USER_ACTION" />
+    <uses-permission android:name="android.permission.ENFORCE_UPDATE_OWNERSHIP" />
+    <uses-permission android:name="android.permission.REQUEST_IGNORE_BATTERY_OPTIMIZATIONS" />
+    <uses-permission
+        android:name="android.permission.QUERY_ALL_PACKAGES"
+        tools:ignore="QueryAllPackagesPermission" />
+
+    <uses-feature
+        android:name="android.software.leanback"
+        android:required="false" />
+    <uses-feature
+        android:name="android.hardware.touchscreen"
+        android:required="false" />
+
+    <application
+        android:name=".Droidify"
+        android:allowBackup="true"
+        android:banner="@drawable/tv_banner"
+        android:enableOnBackInvokedCallback="true"
+        android:icon="@mipmap/ic_launcher"
+        android:label="@string/application_name"
+        android:networkSecurityConfig="@xml/network_security_config"
+        android:supportsRtl="true"
+        android:theme="@style/MainTheme"
+        tools:ignore="UnusedAttribute">
+
+        <receiver
+            android:name=".Droidify$BootReceiver"
+            android:exported="true">
+
+            <intent-filter>
+                <action android:name="android.intent.action.BOOT_COMPLETED" />
+            </intent-filter>
+
+        </receiver>
+
+        <activity
+            android:name=".MainActivity"
+            android:exported="true"
+            android:windowSoftInputMode="adjustResize">
+            <intent-filter>
+                <action android:name="android.intent.action.SHOW_APP_INFO" />
+            </intent-filter>
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+
+                <category android:name="android.intent.category.LAUNCHER" />
+                <category android:name="android.intent.category.LEANBACK_LAUNCHER" />
+            </intent-filter>
+
+            <intent-filter>
+                <action android:name="android.intent.action.VIEW" />
+
+                <category android:name="android.intent.category.DEFAULT" />
+                <category android:name="android.intent.category.BROWSABLE" />
+
+                <data android:scheme="fdroid.app" />
+            </intent-filter>
+
+            <intent-filter>
+                <action android:name="android.intent.action.VIEW" />
+
+                <category android:name="android.intent.category.DEFAULT" />
+                <category android:name="android.intent.category.BROWSABLE" />
+
+                <data
+                    android:host="details"
+                    android:scheme="market" />
+            </intent-filter>
+
+            <intent-filter>
+                <action android:name="android.intent.action.VIEW" />
+
+                <category android:name="android.intent.category.DEFAULT" />
+                <category android:name="android.intent.category.BROWSABLE" />
+
+                <data android:scheme="http" />
+                <data android:scheme="https" />
+                <data android:host="f-droid.org" />
+                <data android:host="www.f-droid.org" />
+                <data android:host="staging.f-droid.org" />
+                <data android:pathPattern="/app/.*" />
+                <data android:pathPattern="/packages/.*" />
+                <data android:pathPattern="/.*/packages/.*" />
+            </intent-filter>
+
+            <intent-filter>
+                <action android:name="android.intent.action.VIEW" />
+
+                <category android:name="android.intent.category.DEFAULT" />
+                <category android:name="android.intent.category.BROWSABLE" />
+
+                <data android:scheme="http" />
+                <data android:scheme="https" />
+                <data android:host="apt.izzysoft.de" />
+                <data android:pathPattern="/fdroid/index/apk/.*" />
+            </intent-filter>
+
+            <intent-filter android:autoVerify="true">
+                <action android:name="android.intent.action.VIEW" />
+
+                <category android:name="android.intent.category.DEFAULT" />
+                <category android:name="android.intent.category.BROWSABLE" />
+
+                <data android:scheme="https" />
+                <data android:host="droidify.eu.org" />
+                <data android:pathPattern="/app/.*" />
+            </intent-filter>
+
+            <!--Adding repo with special url-->
+            <intent-filter>
+                <action android:name="android.intent.action.VIEW" />
+
+                <category android:name="android.intent.category.DEFAULT" />
+                <category android:name="android.intent.category.BROWSABLE" />
+
+                <data android:scheme="fdroidrepo" />
+                <data android:scheme="fdroidrepos" />
+            </intent-filter>
+
+        </activity>
+
+        <service
+            android:name=".service.SyncService"
+            android:foregroundServiceType="dataSync" />
+
+        <service
+            android:name=".service.SyncService$Job"
+            android:exported="false"
+            android:permission="android.permission.BIND_JOB_SERVICE" />
+
+        <service
+            android:name=".service.DownloadService"
+            android:foregroundServiceType="dataSync" />
+
+        <receiver
+            android:name=".installer.installers.session.SessionInstallerReceiver"
+            android:exported="false" />
+
+        <service
+            android:name="androidx.work.impl.foreground.SystemForegroundService"
+            android:foregroundServiceType="dataSync"
+            tools:node="merge" />
+
+        <service
+            android:name="androidx.appcompat.app.AppLocalesMetadataHolderService"
+            android:enabled="false"
+            android:exported="false">
+            <meta-data
+                android:name="autoStoreLocales"
+                android:value="true" />
+        </service>
+
+        <provider
+            android:name="rikka.shizuku.ShizukuProvider"
+            android:authorities="${applicationId}.shizuku"
+            android:enabled="true"
+            android:exported="true"
+            android:multiprocess="false"
+            android:permission="android.permission.INTERACT_ACROSS_USERS_FULL" />
+
+        <provider
+            android:name=".utility.common.cache.Cache$Provider"
+            android:authorities="${applicationId}.provider.cache"
+            android:exported="false"
+            android:grantUriPermissions="true" />
+
+        <provider
+            android:name="androidx.startup.InitializationProvider"
+            android:authorities="${applicationId}.androidx-startup"
+            tools:node="remove" />
+
+    </application>
+
+</manifest>

app/src/main/kotlin/com/looker/droidify/Droidify.kt

@@ -0,0 +1,267 @@
+package com.looker.droidify
+
+import android.annotation.SuppressLint
+import android.app.Application
+import android.content.BroadcastReceiver
+import android.content.Context
+import android.content.Intent
+import android.content.IntentFilter
+import android.os.Build
+import android.os.StrictMode
+import androidx.annotation.RequiresApi
+import androidx.appcompat.app.AppCompatDelegate
+import androidx.hilt.work.HiltWorkerFactory
+import androidx.work.Configuration
+import androidx.work.NetworkType
+import coil3.ImageLoader
+import coil3.PlatformContext
+import coil3.SingletonImageLoader
+import coil3.asImage
+import coil3.disk.DiskCache
+import coil3.disk.directory
+import coil3.memory.MemoryCache
+import coil3.request.crossfade
+import com.looker.droidify.content.ProductPreferences
+import com.looker.droidify.database.Database
+import com.looker.droidify.datastore.SettingsRepository
+import com.looker.droidify.datastore.get
+import com.looker.droidify.datastore.model.AutoSync
+import com.looker.droidify.datastore.model.ProxyPreference
+import com.looker.droidify.datastore.model.ProxyType
+import com.looker.droidify.index.RepositoryUpdater
+import com.looker.droidify.installer.InstallManager
+import com.looker.droidify.network.Downloader
+import com.looker.droidify.receivers.InstalledAppReceiver
+import com.looker.droidify.service.Connection
+import com.looker.droidify.service.SyncService
+import com.looker.droidify.sync.SyncPreference
+import com.looker.droidify.sync.toJobNetworkType
+import com.looker.droidify.utility.common.Constants
+import com.looker.droidify.utility.common.SdkCheck
+import com.looker.droidify.utility.common.cache.Cache
+import com.looker.droidify.utility.common.extension.getDrawableCompat
+import com.looker.droidify.utility.common.extension.getInstalledPackagesCompat
+import com.looker.droidify.utility.common.extension.jobScheduler
+import com.looker.droidify.utility.common.log
+import com.looker.droidify.utility.extension.toInstalledItem
+import com.looker.droidify.work.CleanUpWorker
+import dagger.hilt.android.HiltAndroidApp
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.SupervisorJob
+import kotlinx.coroutines.cancel
+import kotlinx.coroutines.flow.collectIndexed
+import kotlinx.coroutines.flow.drop
+import kotlinx.coroutines.launch
+import java.net.InetSocketAddress
+import java.net.Proxy
+import javax.inject.Inject
+import kotlin.time.Duration.Companion.INFINITE
+import kotlin.time.Duration.Companion.hours
+
+@HiltAndroidApp
+class Droidify : Application(), SingletonImageLoader.Factory, Configuration.Provider {
+
+    private val parentJob = SupervisorJob()
+    private val appScope = CoroutineScope(Dispatchers.Default + parentJob)
+
+    @Inject
+    lateinit var settingsRepository: SettingsRepository
+
+    @Inject
+    lateinit var installer: InstallManager
+
+    @Inject
+    lateinit var downloader: Downloader
+
+    @Inject
+    lateinit var workerFactory: HiltWorkerFactory
+
+    override fun onCreate() {
+        super.onCreate()
+
+        if (BuildConfig.DEBUG && SdkCheck.isOreo) strictThreadPolicy()
+
+        val databaseUpdated = Database.init(this)
+        ProductPreferences.init(this, appScope)
+        RepositoryUpdater.init(appScope, downloader)
+        listenApplications()
+        checkLanguage()
+        updatePreference()
+        appScope.launch { installer() }
+
+        if (databaseUpdated) forceSyncAll()
+    }
+
+    override fun onTerminate() {
+        super.onTerminate()
+        appScope.cancel("Application Terminated")
+        installer.close()
+    }
+
+    private fun listenApplications() {
+        appScope.launch(Dispatchers.Default) {
+            registerReceiver(
+                InstalledAppReceiver(packageManager),
+                IntentFilter().apply {
+                    addAction(Intent.ACTION_PACKAGE_ADDED)
+                    addAction(Intent.ACTION_PACKAGE_REMOVED)
+                    addDataScheme("package")
+                }
+            )
+            val installedItems =
+                packageManager.getInstalledPackagesCompat()
+                    ?.map { it.toInstalledItem() }
+                    ?: return@launch
+            Database.InstalledAdapter.putAll(installedItems)
+        }
+    }
+
+    private fun checkLanguage() {
+        appScope.launch {
+            val lastSetLanguage = settingsRepository.getInitial().language
+            val systemSetLanguage = AppCompatDelegate.getApplicationLocales().toLanguageTags()
+            if (systemSetLanguage != lastSetLanguage && lastSetLanguage != "system") {
+                settingsRepository.setLanguage(systemSetLanguage)
+            }
+        }
+    }
+
+    private fun updatePreference() {
+        appScope.launch {
+            launch {
+                settingsRepository.get { unstableUpdate }.drop(1).collect {
+                    forceSyncAll()
+                }
+            }
+            launch {
+                settingsRepository.get { autoSync }.collectIndexed { index, syncMode ->
+                    // Don't update sync job on initial collect
+                    updateSyncJob(index > 0, syncMode)
+                }
+            }
+            launch {
+                settingsRepository.get { cleanUpInterval }.drop(1).collect {
+                    if (it == INFINITE) {
+                        CleanUpWorker.removeAllSchedules(applicationContext)
+                    } else {
+                        CleanUpWorker.scheduleCleanup(applicationContext, it)
+                    }
+                }
+            }
+            launch {
+                settingsRepository.get { proxy }.collect(::updateProxy)
+            }
+        }
+    }
+
+    private fun updateProxy(proxyPreference: ProxyPreference) {
+        val type = proxyPreference.type
+        val host = proxyPreference.host
+        val port = proxyPreference.port
+        val socketAddress = when (type) {
+            ProxyType.DIRECT -> null
+            ProxyType.HTTP, ProxyType.SOCKS -> {
+                try {
+                    InetSocketAddress.createUnresolved(host, port)
+                } catch (e: IllegalArgumentException) {
+                    log(e)
+                    null
+                }
+            }
+        }
+        val androidProxyType = when (type) {
+            ProxyType.DIRECT -> Proxy.Type.DIRECT
+            ProxyType.HTTP -> Proxy.Type.HTTP
+            ProxyType.SOCKS -> Proxy.Type.SOCKS
+        }
+        val determinedProxy = socketAddress?.let { Proxy(androidProxyType, it) } ?: Proxy.NO_PROXY
+        downloader.setProxy(determinedProxy)
+    }
+
+    private fun updateSyncJob(force: Boolean, autoSync: AutoSync) {
+        if (autoSync == AutoSync.NEVER) {
+            jobScheduler?.cancel(Constants.JOB_ID_SYNC)
+            return
+        }
+        val jobScheduler = jobScheduler
+        val syncConditions = when (autoSync) {
+            AutoSync.ALWAYS -> SyncPreference(NetworkType.CONNECTED)
+            AutoSync.WIFI_ONLY -> SyncPreference(NetworkType.UNMETERED)
+            AutoSync.WIFI_PLUGGED_IN -> SyncPreference(NetworkType.UNMETERED, pluggedIn = true)
+            else -> null
+        }
+        val isCompleted = jobScheduler?.allPendingJobs
+            ?.any { it.id == Constants.JOB_ID_SYNC } == false
+        if ((force || isCompleted) && syncConditions != null) {
+            val period = 12.hours.inWholeMilliseconds
+            val job = SyncService.Job.create(
+                context = this,
+                periodMillis = period,
+                networkType = syncConditions.toJobNetworkType(),
+                isCharging = syncConditions.pluggedIn,
+                isBatteryLow = syncConditions.batteryNotLow
+            )
+            jobScheduler?.schedule(job)
+        }
+    }
+
+    private fun forceSyncAll() {
+        Database.RepositoryAdapter.getAll().forEach {
+            if (it.lastModified.isNotEmpty() || it.entityTag.isNotEmpty()) {
+                Database.RepositoryAdapter.put(it.copy(lastModified = "", entityTag = ""))
+            }
+        }
+        Connection(SyncService::class.java, onBind = { connection, binder ->
+            binder.sync(SyncService.SyncRequest.FORCE)
+            connection.unbind(this)
+        }).bind(this)
+    }
+
+    class BootReceiver : BroadcastReceiver() {
+        @SuppressLint("UnsafeProtectedBroadcastReceiver")
+        override fun onReceive(context: Context, intent: Intent) = Unit
+    }
+
+    override val workManagerConfiguration: Configuration
+        get() = Configuration.Builder()
+            .setWorkerFactory(workerFactory)
+            .build()
+
+    override fun newImageLoader(context: PlatformContext): ImageLoader {
+        val memoryCache = MemoryCache.Builder()
+            .maxSizePercent(context, 0.25)
+            .build()
+
+        val diskCache = DiskCache.Builder()
+            .directory(Cache.getImagesDir(this))
+            .maxSizePercent(0.05)
+            .build()
+
+        return ImageLoader.Builder(this)
+            .memoryCache(memoryCache)
+            .diskCache(diskCache)
+            .error(getDrawableCompat(R.drawable.ic_cannot_load).asImage())
+            .crossfade(350)
+            .build()
+    }
+}
+
+@RequiresApi(Build.VERSION_CODES.O)
+fun strictThreadPolicy() {
+    StrictMode.setThreadPolicy(
+        StrictMode.ThreadPolicy.Builder()
+            .detectDiskReads()
+            .detectDiskWrites()
+            .detectNetwork()
+            .detectUnbufferedIo()
+            .penaltyLog()
+            .build()
+    )
+    StrictMode.setVmPolicy(
+        StrictMode.VmPolicy.Builder()
+            .detectAll()
+            .penaltyLog()
+            .build()
+    )
+}

app/src/main/kotlin/com/looker/droidify/MainActivity.kt

@@ -0,0 +1,307 @@
+package com.looker.droidify
+
+import android.content.Intent
+import android.os.Build
+import android.os.Bundle
+import android.os.Parcelable
+import android.view.ViewGroup
+import android.widget.FrameLayout
+import androidx.activity.OnBackPressedCallback
+import androidx.activity.result.contract.ActivityResultContracts
+import androidx.appcompat.app.AppCompatActivity
+import androidx.appcompat.widget.Toolbar
+import androidx.core.view.WindowCompat
+import androidx.fragment.app.Fragment
+import androidx.fragment.app.commit
+import androidx.lifecycle.lifecycleScope
+import com.looker.droidify.utility.common.DeeplinkType
+import com.looker.droidify.utility.common.SdkCheck
+import com.looker.droidify.utility.common.deeplinkType
+import com.looker.droidify.utility.common.extension.homeAsUp
+import com.looker.droidify.utility.common.extension.inputManager
+import com.looker.droidify.utility.common.getInstallPackageName
+import com.looker.droidify.utility.common.requestNotificationPermission
+import com.looker.droidify.database.CursorOwner
+import com.looker.droidify.datastore.SettingsRepository
+import com.looker.droidify.datastore.extension.getThemeRes
+import com.looker.droidify.datastore.get
+import com.looker.droidify.installer.InstallManager
+import com.looker.droidify.installer.model.installFrom
+import com.looker.droidify.ui.appDetail.AppDetailFragment
+import com.looker.droidify.ui.favourites.FavouritesFragment
+import com.looker.droidify.ui.repository.EditRepositoryFragment
+import com.looker.droidify.ui.repository.RepositoriesFragment
+import com.looker.droidify.ui.repository.RepositoryFragment
+import com.looker.droidify.ui.settings.SettingsFragment
+import com.looker.droidify.ui.tabsFragment.TabsFragment
+import dagger.hilt.EntryPoint
+import dagger.hilt.InstallIn
+import dagger.hilt.android.AndroidEntryPoint
+import dagger.hilt.android.EntryPointAccessors
+import dagger.hilt.components.SingletonComponent
+import kotlinx.coroutines.flow.drop
+import kotlinx.coroutines.flow.first
+import kotlinx.coroutines.launch
+import kotlinx.coroutines.runBlocking
+import kotlinx.parcelize.Parcelize
+import javax.inject.Inject
+
+@AndroidEntryPoint
+class MainActivity : AppCompatActivity() {
+    companion object {
+        private const val STATE_FRAGMENT_STACK = "fragmentStack"
+        const val ACTION_UPDATES = "${BuildConfig.APPLICATION_ID}.intent.action.UPDATES"
+        const val ACTION_INSTALL = "${BuildConfig.APPLICATION_ID}.intent.action.INSTALL"
+        const val EXTRA_CACHE_FILE_NAME =
+            "${BuildConfig.APPLICATION_ID}.intent.extra.CACHE_FILE_NAME"
+    }
+
+    private val notificationPermission =
+        registerForActivityResult(ActivityResultContracts.RequestPermission()) { }
+
+    @Inject
+    lateinit var installer: InstallManager
+
+    @Parcelize
+    private class FragmentStackItem(
+        val className: String, val arguments: Bundle?, val savedState: Fragment.SavedState?
+    ) : Parcelable
+
+    lateinit var cursorOwner: CursorOwner
+        private set
+
+    private var onBackPressedCallback: OnBackPressedCallback? = null
+
+    private val fragmentStack = mutableListOf<FragmentStackItem>()
+
+    private val currentFragment: Fragment?
+        get() {
+            supportFragmentManager.executePendingTransactions()
+            return supportFragmentManager.findFragmentById(R.id.main_content)
+        }
+
+    @EntryPoint
+    @InstallIn(SingletonComponent::class)
+    interface CustomUserRepositoryInjector {
+        fun settingsRepository(): SettingsRepository
+    }
+
+    private fun collectChange() {
+        val hiltEntryPoint = EntryPointAccessors.fromApplication(
+            this, CustomUserRepositoryInjector::class.java
+        )
+        val newSettings = hiltEntryPoint.settingsRepository().get { theme to dynamicTheme }
+        runBlocking {
+            val theme = newSettings.first()
+            setTheme(
+                resources.configuration.getThemeRes(
+                    theme = theme.first, dynamicTheme = theme.second
+                )
+            )
+        }
+        lifecycleScope.launch {
+            newSettings.drop(1).collect { themeAndDynamic ->
+                setTheme(
+                    resources.configuration.getThemeRes(
+                        theme = themeAndDynamic.first, dynamicTheme = themeAndDynamic.second
+                    )
+                )
+                recreate()
+            }
+        }
+    }
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        collectChange()
+        super.onCreate(savedInstanceState)
+        val rootView = FrameLayout(this).apply { id = R.id.main_content }
+        addContentView(
+            rootView, ViewGroup.LayoutParams(
+                ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT
+            )
+        )
+
+        requestNotificationPermission(request = notificationPermission::launch)
+
+        supportFragmentManager.addFragmentOnAttachListener { _, _ ->
+            hideKeyboard()
+        }
+
+        if (savedInstanceState == null) {
+            cursorOwner = CursorOwner()
+            supportFragmentManager.commit {
+                add(cursorOwner, CursorOwner::class.java.name)
+            }
+        } else {
+            cursorOwner =
+                supportFragmentManager.findFragmentByTag(CursorOwner::class.java.name) as CursorOwner
+        }
+
+        savedInstanceState?.getParcelableArrayList<FragmentStackItem>(STATE_FRAGMENT_STACK)
+            ?.let { fragmentStack += it }
+        if (savedInstanceState == null) {
+            replaceFragment(TabsFragment(), null)
+            if ((intent.flags and Intent.FLAG_ACTIVITY_LAUNCHED_FROM_HISTORY) == 0) {
+                handleIntent(intent)
+            }
+        }
+        if (SdkCheck.isR) {
+            window.statusBarColor = resources.getColor(android.R.color.transparent, theme)
+            window.navigationBarColor = resources.getColor(android.R.color.transparent, theme)
+            WindowCompat.setDecorFitsSystemWindows(window, false)
+        }
+        backHandler()
+    }
+
+    override fun onDestroy() {
+        super.onDestroy()
+        onBackPressedCallback = null
+    }
+
+    override fun onSaveInstanceState(outState: Bundle) {
+        super.onSaveInstanceState(outState)
+        outState.putParcelableArrayList(STATE_FRAGMENT_STACK, ArrayList(fragmentStack))
+    }
+
+    private fun backHandler() {
+        if (onBackPressedCallback == null) {
+            onBackPressedCallback = object : OnBackPressedCallback(enabled = false) {
+                override fun handleOnBackPressed() {
+                    hideKeyboard()
+                    popFragment()
+                }
+            }
+            onBackPressedDispatcher.addCallback(
+                this,
+                onBackPressedCallback!!,
+            )
+        }
+        onBackPressedCallback?.isEnabled = fragmentStack.isNotEmpty()
+    }
+
+    private fun replaceFragment(fragment: Fragment, open: Boolean?) {
+        if (open != null) {
+            currentFragment?.view?.translationZ =
+                (if (open) Int.MIN_VALUE else Int.MAX_VALUE).toFloat()
+        }
+        supportFragmentManager.commit {
+            if (open != null) {
+                setCustomAnimations(
+                    if (open) R.animator.slide_in else 0,
+                    if (open) R.animator.slide_in_keep else R.animator.slide_out
+                )
+            }
+            setReorderingAllowed(true)
+            replace(R.id.main_content, fragment)
+        }
+    }
+
+    private fun pushFragment(fragment: Fragment) {
+        currentFragment?.let {
+            fragmentStack.add(
+                FragmentStackItem(
+                    it::class.java.name,
+                    it.arguments,
+                    supportFragmentManager.saveFragmentInstanceState(it)
+                )
+            )
+        }
+        replaceFragment(fragment, true)
+        backHandler()
+    }
+
+    private fun popFragment(): Boolean {
+        return fragmentStack.isNotEmpty() && run {
+            val stackItem = fragmentStack.removeAt(fragmentStack.size - 1)
+            val fragment = Class.forName(stackItem.className).newInstance() as Fragment
+            stackItem.arguments?.let(fragment::setArguments)
+            stackItem.savedState?.let(fragment::setInitialSavedState)
+            replaceFragment(fragment, false)
+            backHandler()
+            true
+        }
+    }
+
+    private fun hideKeyboard() {
+        inputManager?.hideSoftInputFromWindow((currentFocus ?: window.decorView).windowToken, 0)
+    }
+
+    internal fun onToolbarCreated(toolbar: Toolbar) {
+        if (fragmentStack.isNotEmpty()) {
+            toolbar.navigationIcon = toolbar.context.homeAsUp
+            toolbar.setNavigationOnClickListener { onBackPressedDispatcher.onBackPressed() }
+        }
+    }
+
+    override fun onNewIntent(intent: Intent) {
+        super.onNewIntent(intent)
+        handleIntent(intent)
+    }
+
+    private fun handleIntent(intent: Intent?) {
+        when (intent?.action) {
+            ACTION_UPDATES -> {
+                if (currentFragment !is TabsFragment) {
+                    fragmentStack.clear()
+                    replaceFragment(TabsFragment(), true)
+                }
+                val tabsFragment = currentFragment as TabsFragment
+                tabsFragment.selectUpdates()
+                backHandler()
+            }
+
+            ACTION_INSTALL -> {
+                val packageName = intent.getInstallPackageName
+                if (!packageName.isNullOrEmpty()) {
+                    navigateProduct(packageName)
+                    val cacheFile = intent.getStringExtra(EXTRA_CACHE_FILE_NAME) ?: return
+                    val installItem = packageName installFrom cacheFile
+                    lifecycleScope.launch { installer install installItem }
+                }
+            }
+
+            Intent.ACTION_VIEW -> {
+                when (val deeplink = intent.deeplinkType) {
+                    is DeeplinkType.AppDetail -> {
+                        val fragment = currentFragment
+                        if (fragment !is AppDetailFragment) {
+                            navigateProduct(deeplink.packageName, deeplink.repoAddress)
+                        }
+                    }
+
+                    is DeeplinkType.AddRepository -> {
+                        navigateAddRepository(repoAddress = deeplink.address)
+                    }
+
+                    null -> {}
+                }
+            }
+
+            Intent.ACTION_SHOW_APP_INFO -> {
+                if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
+                    val packageName = intent.getStringExtra(Intent.EXTRA_PACKAGE_NAME)
+
+                    if (packageName != null && currentFragment !is AppDetailFragment) {
+                        navigateProduct(packageName)
+                    }
+                }
+
+            }
+        }
+    }
+
+    fun navigateFavourites() = pushFragment(FavouritesFragment())
+    fun navigateProduct(packageName: String, repoAddress: String? = null) =
+        pushFragment(AppDetailFragment(packageName, repoAddress))
+
+    fun navigateRepositories() = pushFragment(RepositoriesFragment())
+    fun navigatePreferences() = pushFragment(SettingsFragment.newInstance())
+    fun navigateAddRepository(repoAddress: String? = null) =
+        pushFragment(EditRepositoryFragment(null, repoAddress))
+
+    fun navigateRepository(repositoryId: Long) =
+        pushFragment(RepositoryFragment(repositoryId))
+
+    fun navigateEditRepository(repositoryId: Long) =
+        pushFragment(EditRepositoryFragment(repositoryId, null))
+}

app/src/main/kotlin/com/looker/droidify/content/ProductPreferences.kt

@@ -0,0 +1,79 @@
+package com.looker.droidify.content
+
+import android.content.Context
+import android.content.SharedPreferences
+import com.looker.droidify.utility.common.extension.Json
+import com.looker.droidify.utility.common.extension.parseDictionary
+import com.looker.droidify.utility.common.extension.writeDictionary
+import com.looker.droidify.model.ProductPreference
+import com.looker.droidify.database.Database
+import com.looker.droidify.utility.serialization.productPreference
+import com.looker.droidify.utility.serialization.serialize
+import java.io.ByteArrayOutputStream
+import java.nio.charset.Charset
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.flow.MutableSharedFlow
+import kotlinx.coroutines.flow.asSharedFlow
+import kotlinx.coroutines.launch
+
+object ProductPreferences {
+    private val defaultProductPreference = ProductPreference(false, 0L)
+    private lateinit var preferences: SharedPreferences
+    private val mutableSubject = MutableSharedFlow<Pair<String, Long?>>()
+    private val subject = mutableSubject.asSharedFlow()
+
+    fun init(context: Context, scope: CoroutineScope) {
+        preferences = context.getSharedPreferences("product_preferences", Context.MODE_PRIVATE)
+        Database.LockAdapter.putAll(
+            preferences.all.keys.mapNotNull { packageName ->
+                this[packageName].databaseVersionCode?.let { Pair(packageName, it) }
+            }
+        )
+        scope.launch {
+            subject.collect { (packageName, versionCode) ->
+                if (versionCode != null) {
+                    Database.LockAdapter.put(Pair(packageName, versionCode))
+                } else {
+                    Database.LockAdapter.delete(packageName)
+                }
+            }
+        }
+    }
+
+    private val ProductPreference.databaseVersionCode: Long?
+        get() = when {
+            ignoreUpdates -> 0L
+            ignoreVersionCode > 0L -> ignoreVersionCode
+            else -> null
+        }
+
+    operator fun get(packageName: String): ProductPreference {
+        return if (preferences.contains(packageName)) {
+            try {
+                Json.factory.createParser(preferences.getString(packageName, "{}"))
+                    .use { it.parseDictionary { productPreference() } }
+            } catch (e: Exception) {
+                e.printStackTrace()
+                defaultProductPreference
+            }
+        } else {
+            defaultProductPreference
+        }
+    }
+
+    operator fun set(packageName: String, productPreference: ProductPreference) {
+        val oldProductPreference = this[packageName]
+        preferences.edit().putString(
+            packageName,
+            ByteArrayOutputStream().apply {
+                Json.factory.createGenerator(this)
+                    .use { it.writeDictionary(productPreference::serialize) }
+            }.toByteArray().toString(Charset.defaultCharset())
+        ).apply()
+        if (oldProductPreference.ignoreUpdates != productPreference.ignoreUpdates ||
+            oldProductPreference.ignoreVersionCode != productPreference.ignoreVersionCode
+        ) {
+            mutableSubject.tryEmit(Pair(packageName, productPreference.databaseVersionCode))
+        }
+    }
+}

app/src/main/kotlin/com/looker/droidify/database/CursorOwner.kt

@@ -0,0 +1,145 @@
+package com.looker.droidify.database
+
+import android.database.Cursor
+import android.os.Bundle
+import androidx.fragment.app.Fragment
+import androidx.loader.app.LoaderManager
+import androidx.loader.content.Loader
+import com.looker.droidify.datastore.model.SortOrder
+import com.looker.droidify.model.ProductItem
+
+class CursorOwner : Fragment(), LoaderManager.LoaderCallbacks<Cursor> {
+    sealed class Request {
+        internal abstract val id: Int
+
+        class Available(
+            val searchQuery: String,
+            val section: ProductItem.Section,
+            val order: SortOrder,
+        ) : Request() {
+            override val id: Int
+                get() = 1
+        }
+
+        class Installed(
+            val searchQuery: String,
+            val section: ProductItem.Section,
+            val order: SortOrder,
+        ) : Request() {
+            override val id: Int
+                get() = 2
+        }
+
+        class Updates(
+            val searchQuery: String,
+            val section: ProductItem.Section,
+            val order: SortOrder,
+            val skipSignatureCheck: Boolean,
+        ) : Request() {
+            override val id: Int
+                get() = 3
+        }
+
+        object Repositories : Request() {
+            override val id: Int
+                get() = 4
+        }
+    }
+
+    interface Callback {
+        fun onCursorData(request: Request, cursor: Cursor?)
+    }
+
+    private data class ActiveRequest(
+        val request: Request,
+        val callback: Callback?,
+        val cursor: Cursor?,
+    )
+
+    init {
+        retainInstance = true
+    }
+
+    private val activeRequests = mutableMapOf<Int, ActiveRequest>()
+
+    fun attach(callback: Callback, request: Request) {
+        val oldActiveRequest = activeRequests[request.id]
+        if (oldActiveRequest?.callback != null &&
+            oldActiveRequest.callback != callback && oldActiveRequest.cursor != null
+        ) {
+            oldActiveRequest.callback.onCursorData(oldActiveRequest.request, null)
+        }
+        val cursor = if (oldActiveRequest?.request == request && oldActiveRequest.cursor != null) {
+            callback.onCursorData(request, oldActiveRequest.cursor)
+            oldActiveRequest.cursor
+        } else {
+            null
+        }
+        activeRequests[request.id] = ActiveRequest(request, callback, cursor)
+        if (cursor == null) {
+            LoaderManager.getInstance(this).restartLoader(request.id, null, this)
+        }
+    }
+
+    fun detach(callback: Callback) {
+        for (id in activeRequests.keys) {
+            val activeRequest = activeRequests[id]!!
+            if (activeRequest.callback == callback) {
+                activeRequests[id] = activeRequest.copy(callback = null)
+            }
+        }
+    }
+
+    override fun onCreateLoader(id: Int, args: Bundle?): Loader<Cursor> {
+        val request = activeRequests[id]!!.request
+        return QueryLoader(requireContext()) {
+            when (request) {
+                is Request.Available ->
+                    Database.ProductAdapter
+                        .query(
+                            installed = false,
+                            updates = false,
+                            searchQuery = request.searchQuery,
+                            section = request.section,
+                            order = request.order,
+                            signal = it,
+                        )
+
+                is Request.Installed ->
+                    Database.ProductAdapter
+                        .query(
+                            installed = true,
+                            updates = false,
+                            searchQuery = request.searchQuery,
+                            section = request.section,
+                            order = request.order,
+                            signal = it,
+                        )
+
+                is Request.Updates ->
+                    Database.ProductAdapter
+                        .query(
+                            installed = true,
+                            updates = true,
+                            searchQuery = request.searchQuery,
+                            section = request.section,
+                            order = request.order,
+                            signal = it,
+                            skipSignatureCheck = request.skipSignatureCheck,
+                        )
+
+                is Request.Repositories -> Database.RepositoryAdapter.query(it)
+            }
+        }
+    }
+
+    override fun onLoadFinished(loader: Loader<Cursor>, data: Cursor?) {
+        val activeRequest = activeRequests[loader.id]
+        if (activeRequest != null) {
+            activeRequests[loader.id] = activeRequest.copy(cursor = data)
+            activeRequest.callback?.onCursorData(activeRequest.request, data)
+        }
+    }
+
+    override fun onLoaderReset(loader: Loader<Cursor>) = onLoadFinished(loader, null)
+}

app/src/main/kotlin/com/looker/droidify/database/Database.kt

@@ -0,0 +1,982 @@
+package com.looker.droidify.database
+
+import android.content.ContentValues
+import android.content.Context
+import android.database.Cursor
+import android.database.sqlite.SQLiteDatabase
+import android.database.sqlite.SQLiteOpenHelper
+import android.os.CancellationSignal
+import androidx.core.database.sqlite.transaction
+import com.fasterxml.jackson.core.JsonGenerator
+import com.fasterxml.jackson.core.JsonParser
+import com.looker.droidify.BuildConfig
+import com.looker.droidify.datastore.model.SortOrder
+import com.looker.droidify.model.InstalledItem
+import com.looker.droidify.model.Product
+import com.looker.droidify.model.ProductItem
+import com.looker.droidify.model.Repository
+import com.looker.droidify.utility.common.extension.Json
+import com.looker.droidify.utility.common.extension.asSequence
+import com.looker.droidify.utility.common.extension.firstOrNull
+import com.looker.droidify.utility.common.extension.parseDictionary
+import com.looker.droidify.utility.common.extension.writeDictionary
+import com.looker.droidify.utility.common.log
+import com.looker.droidify.utility.serialization.product
+import com.looker.droidify.utility.serialization.productItem
+import com.looker.droidify.utility.serialization.repository
+import com.looker.droidify.utility.serialization.serialize
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.channels.awaitClose
+import kotlinx.coroutines.delay
+import kotlinx.coroutines.flow.Flow
+import kotlinx.coroutines.flow.callbackFlow
+import kotlinx.coroutines.flow.emitAll
+import kotlinx.coroutines.flow.flowOf
+import kotlinx.coroutines.flow.flowOn
+import kotlinx.coroutines.flow.map
+import kotlinx.coroutines.flow.onCompletion
+import kotlinx.coroutines.flow.onEach
+import kotlinx.coroutines.withContext
+import java.io.ByteArrayOutputStream
+import kotlin.collections.component1
+import kotlin.collections.component2
+import kotlin.collections.set
+
+object Database {
+    fun init(context: Context): Boolean {
+        val helper = Helper(context)
+        db = helper.writableDatabase
+        if (helper.created) {
+            for (repository in Repository.defaultRepositories.sortedBy { it.name }) {
+                RepositoryAdapter.put(repository)
+            }
+        }
+        RepositoryAdapter.removeDuplicates()
+        return helper.created || helper.updated
+    }
+
+    private lateinit var db: SQLiteDatabase
+
+    private interface Table {
+        val memory: Boolean
+        val innerName: String
+        val createTable: String
+        val createIndex: String?
+            get() = null
+
+        val databasePrefix: String
+            get() = if (memory) "memory." else ""
+
+        val name: String
+            get() = "$databasePrefix$innerName"
+
+        fun formatCreateTable(name: String): String {
+            return buildString(128) {
+                append("CREATE TABLE ")
+                append(name)
+                append(" (")
+                trimAndJoin(createTable)
+                append(")")
+            }
+        }
+
+        val createIndexPairFormatted: Pair<String, String>?
+            get() = createIndex?.let {
+                Pair(
+                    "CREATE INDEX ${innerName}_index ON $innerName ($it)",
+                    "CREATE INDEX ${name}_index ON $innerName ($it)",
+                )
+            }
+    }
+
+    private object Schema {
+        object Repository : Table {
+            const val ROW_ID = "_id"
+            const val ROW_ENABLED = "enabled"
+            const val ROW_DELETED = "deleted"
+            const val ROW_DATA = "data"
+
+            override val memory = false
+            override val innerName = "repository"
+            override val createTable = """
+        $ROW_ID INTEGER PRIMARY KEY AUTOINCREMENT,
+        $ROW_ENABLED INTEGER NOT NULL,
+        $ROW_DELETED INTEGER NOT NULL,
+        $ROW_DATA BLOB NOT NULL
+      """
+        }
+
+        object Product : Table {
+            const val ROW_REPOSITORY_ID = "repository_id"
+            const val ROW_PACKAGE_NAME = "package_name"
+            const val ROW_NAME = "name"
+            const val ROW_SUMMARY = "summary"
+            const val ROW_DESCRIPTION = "description"
+            const val ROW_ADDED = "added"
+            const val ROW_UPDATED = "updated"
+            const val ROW_VERSION_CODE = "version_code"
+            const val ROW_SIGNATURES = "signatures"
+            const val ROW_COMPATIBLE = "compatible"
+            const val ROW_DATA = "data"
+            const val ROW_DATA_ITEM = "data_item"
+
+            override val memory = false
+            override val innerName = "product"
+            override val createTable = """
+        $ROW_REPOSITORY_ID INTEGER NOT NULL,
+        $ROW_PACKAGE_NAME TEXT NOT NULL,
+        $ROW_NAME TEXT NOT NULL,
+        $ROW_SUMMARY TEXT NOT NULL,
+        $ROW_DESCRIPTION TEXT NOT NULL,
+        $ROW_ADDED INTEGER NOT NULL,
+        $ROW_UPDATED INTEGER NOT NULL,
+        $ROW_VERSION_CODE INTEGER NOT NULL,
+        $ROW_SIGNATURES TEXT NOT NULL,
+        $ROW_COMPATIBLE INTEGER NOT NULL,
+        $ROW_DATA BLOB NOT NULL,
+        $ROW_DATA_ITEM BLOB NOT NULL,
+        PRIMARY KEY ($ROW_REPOSITORY_ID, $ROW_PACKAGE_NAME)
+      """
+            override val createIndex = ROW_PACKAGE_NAME
+        }
+
+        object Category : Table {
+            const val ROW_REPOSITORY_ID = "repository_id"
+            const val ROW_PACKAGE_NAME = "package_name"
+            const val ROW_NAME = "name"
+
+            override val memory = false
+            override val innerName = "category"
+            override val createTable = """
+        $ROW_REPOSITORY_ID INTEGER NOT NULL,
+        $ROW_PACKAGE_NAME TEXT NOT NULL,
+        $ROW_NAME TEXT NOT NULL,
+        PRIMARY KEY ($ROW_REPOSITORY_ID, $ROW_PACKAGE_NAME, $ROW_NAME)
+      """
+            override val createIndex = "$ROW_PACKAGE_NAME, $ROW_NAME"
+        }
+
+        object Installed : Table {
+            const val ROW_PACKAGE_NAME = "package_name"
+            const val ROW_VERSION = "version"
+            const val ROW_VERSION_CODE = "version_code"
+            const val ROW_SIGNATURE = "signature"
+
+            override val memory = true
+            override val innerName = "installed"
+            override val createTable = """
+        $ROW_PACKAGE_NAME TEXT PRIMARY KEY,
+        $ROW_VERSION TEXT NOT NULL,
+        $ROW_VERSION_CODE INTEGER NOT NULL,
+        $ROW_SIGNATURE TEXT NOT NULL
+      """
+        }
+
+        object Lock : Table {
+            const val ROW_PACKAGE_NAME = "package_name"
+            const val ROW_VERSION_CODE = "version_code"
+
+            override val memory = true
+            override val innerName = "lock"
+            override val createTable = """
+        $ROW_PACKAGE_NAME TEXT PRIMARY KEY,
+        $ROW_VERSION_CODE INTEGER NOT NULL
+      """
+        }
+
+        object Synthetic {
+            const val ROW_CAN_UPDATE = "can_update"
+            const val ROW_MATCH_RANK = "match_rank"
+        }
+    }
+
+    private class Helper(context: Context) : SQLiteOpenHelper(context, "droidify", null, 5) {
+        var created = false
+            private set
+        var updated = false
+            private set
+
+        override fun onCreate(db: SQLiteDatabase) = Unit
+        override fun onUpgrade(db: SQLiteDatabase, oldVersion: Int, newVersion: Int) =
+            onVersionChange(db)
+
+        override fun onDowngrade(db: SQLiteDatabase, oldVersion: Int, newVersion: Int) =
+            onVersionChange(db)
+
+        private fun onVersionChange(db: SQLiteDatabase) {
+            handleTables(db, true, Schema.Product, Schema.Category)
+            addRepos(db, Repository.newlyAdded)
+            this.updated = true
+        }
+
+        override fun onOpen(db: SQLiteDatabase) {
+            val create = handleTables(db, false, Schema.Repository)
+            val updated = handleTables(db, create, Schema.Product, Schema.Category)
+            db.execSQL("ATTACH DATABASE ':memory:' AS memory")
+            handleTables(db, false, Schema.Installed, Schema.Lock)
+            handleIndexes(
+                db,
+                Schema.Repository,
+                Schema.Product,
+                Schema.Category,
+                Schema.Installed,
+                Schema.Lock,
+            )
+            dropOldTables(db, Schema.Repository, Schema.Product, Schema.Category)
+            this.created = this.created || create
+            this.updated = this.updated || create || updated
+        }
+    }
+
+    private fun handleTables(db: SQLiteDatabase, recreate: Boolean, vararg tables: Table): Boolean {
+        val shouldRecreate = recreate || tables.any { table ->
+            val sql = db.query(
+                "${table.databasePrefix}sqlite_master",
+                columns = arrayOf("sql"),
+                selection = Pair("type = ? AND name = ?", arrayOf("table", table.innerName)),
+            ).use { it.firstOrNull()?.getString(0) }.orEmpty()
+            table.formatCreateTable(table.innerName) != sql
+        }
+        return shouldRecreate && run {
+            val shouldVacuum = tables.map {
+                db.execSQL("DROP TABLE IF EXISTS ${it.name}")
+                db.execSQL(it.formatCreateTable(it.name))
+                !it.memory
+            }
+            if (shouldVacuum.any { it } && !db.inTransaction()) {
+                db.execSQL("VACUUM")
+            }
+            true
+        }
+    }
+
+    private fun addRepos(db: SQLiteDatabase, repos: List<Repository>) {
+        if (BuildConfig.DEBUG) {
+            log("Add Repos: $repos", "RepositoryAdapter")
+        }
+        if (repos.isEmpty()) return
+        db.transaction {
+            repos.forEach {
+                RepositoryAdapter.put(it, database = this)
+            }
+        }
+    }
+
+    private fun handleIndexes(db: SQLiteDatabase, vararg tables: Table) {
+        val shouldVacuum = tables.map { table ->
+            val sqls = db.query(
+                "${table.databasePrefix}sqlite_master",
+                columns = arrayOf("name", "sql"),
+                selection = Pair("type = ? AND tbl_name = ?", arrayOf("index", table.innerName)),
+            )
+                .use { cursor ->
+                    cursor.asSequence()
+                        .mapNotNull { it.getString(1)?.let { sql -> Pair(it.getString(0), sql) } }
+                        .toList()
+                }
+                .filter { !it.first.startsWith("sqlite_") }
+            val createIndexes = table.createIndexPairFormatted?.let { listOf(it) }.orEmpty()
+            createIndexes.map { it.first } != sqls.map { it.second } && run {
+                for (name in sqls.map { it.first }) {
+                    db.execSQL("DROP INDEX IF EXISTS $name")
+                }
+                for (createIndexPair in createIndexes) {
+                    db.execSQL(createIndexPair.second)
+                }
+                !table.memory
+            }
+        }
+        if (shouldVacuum.any { it } && !db.inTransaction()) {
+            db.execSQL("VACUUM")
+        }
+    }
+
+    private fun dropOldTables(db: SQLiteDatabase, vararg neededTables: Table) {
+        val tables = db.query(
+            "sqlite_master",
+            columns = arrayOf("name"),
+            selection = Pair("type = ?", arrayOf("table")),
+        )
+            .use { cursor -> cursor.asSequence().mapNotNull { it.getString(0) }.toList() }
+            .filter { !it.startsWith("sqlite_") && !it.startsWith("android_") }
+            .toSet() - neededTables.mapNotNull { if (it.memory) null else it.name }.toSet()
+        if (tables.isNotEmpty()) {
+            for (table in tables) {
+                db.execSQL("DROP TABLE IF EXISTS $table")
+            }
+            if (!db.inTransaction()) {
+                db.execSQL("VACUUM")
+            }
+        }
+    }
+
+    sealed class Subject {
+        data object Repositories : Subject()
+        data class Repository(val id: Long) : Subject()
+        data object Products : Subject()
+    }
+
+    private val observers = mutableMapOf<Subject, MutableSet<() -> Unit>>()
+
+    private fun dataObservable(subject: Subject): (Boolean, () -> Unit) -> Unit =
+        { register, observer ->
+            synchronized(observers) {
+                val set = observers[subject] ?: run {
+                    val set = mutableSetOf<() -> Unit>()
+                    observers[subject] = set
+                    set
+                }
+                if (register) {
+                    set += observer
+                } else {
+                    set -= observer
+                }
+            }
+        }
+
+    fun flowCollection(subject: Subject): Flow<Unit> = callbackFlow {
+        val callback: () -> Unit = { trySend(Unit) }
+        val dataObservable = dataObservable(subject)
+        dataObservable(true, callback)
+
+        awaitClose { dataObservable(false, callback) }
+    }.flowOn(Dispatchers.IO)
+
+    private fun notifyChanged(vararg subjects: Subject) {
+        synchronized(observers) {
+            subjects.asSequence().mapNotNull { observers[it] }.flatten().forEach { it() }
+        }
+    }
+
+    private fun SQLiteDatabase.insertOrReplace(
+        replace: Boolean,
+        table: String,
+        contentValues: ContentValues,
+    ): Long {
+        return if (replace) {
+            replace(table, null, contentValues)
+        } else {
+            insert(
+                table,
+                null,
+                contentValues,
+            )
+        }
+    }
+
+    private fun SQLiteDatabase.query(
+        table: String,
+        columns: Array<String>? = null,
+        selection: Pair<String, Array<String>>? = null,
+        orderBy: String? = null,
+        signal: CancellationSignal? = null,
+    ): Cursor {
+        return query(
+            false,
+            table,
+            columns,
+            selection?.first,
+            selection?.second,
+            null,
+            null,
+            orderBy,
+            null,
+            signal,
+        )
+    }
+
+    private fun Cursor.observable(subject: Subject): ObservableCursor {
+        return ObservableCursor(this, dataObservable(subject))
+    }
+
+    fun <T> ByteArray.jsonParse(callback: (JsonParser) -> T): T {
+        return Json.factory.createParser(this).use { it.parseDictionary(callback) }
+    }
+
+    fun jsonGenerate(callback: (JsonGenerator) -> Unit): ByteArray {
+        val outputStream = ByteArrayOutputStream()
+        Json.factory.createGenerator(outputStream).use { it.writeDictionary(callback) }
+        return outputStream.toByteArray()
+    }
+
+    object RepositoryAdapter {
+        internal fun putWithoutNotification(
+            repository: Repository,
+            shouldReplace: Boolean,
+            database: SQLiteDatabase,
+        ): Long {
+            return database.insertOrReplace(
+                shouldReplace,
+                Schema.Repository.name,
+                ContentValues().apply {
+                    if (shouldReplace) {
+                        put(Schema.Repository.ROW_ID, repository.id)
+                    }
+                    put(Schema.Repository.ROW_ENABLED, if (repository.enabled) 1 else 0)
+                    put(Schema.Repository.ROW_DELETED, 0)
+                    put(Schema.Repository.ROW_DATA, jsonGenerate(repository::serialize))
+                },
+            )
+        }
+
+        fun put(repository: Repository, database: SQLiteDatabase = db): Repository {
+            val shouldReplace = repository.id >= 0L
+            val newId = putWithoutNotification(repository, shouldReplace, database)
+            val id = if (shouldReplace) repository.id else newId
+            notifyChanged(Subject.Repositories, Subject.Repository(id), Subject.Products)
+            return if (newId != repository.id) repository.copy(id = newId) else repository
+        }
+
+        fun removeDuplicates() {
+            db.transaction {
+                val all = getAll()
+                val different = all.distinctBy { it.address }
+                val duplicates = all - different.toSet()
+                duplicates.forEach {
+                    markAsDeleted(it.id)
+                }
+            }
+        }
+
+        fun getStream(id: Long): Flow<Repository?> = flowOf(Unit)
+            .onCompletion { if (it == null) emitAll(flowCollection(Subject.Repositories)) }
+            .map { get(id) }
+            .flowOn(Dispatchers.IO)
+
+        fun get(id: Long): Repository? {
+            return db.query(
+                Schema.Repository.name,
+                selection = Pair(
+                    "${Schema.Repository.ROW_ID} = ? AND ${Schema.Repository.ROW_DELETED} == 0",
+                    arrayOf(id.toString()),
+                ),
+            ).use { it.firstOrNull()?.let(::transform) }
+        }
+
+        fun getAllStream(): Flow<List<Repository>> = flowOf(Unit)
+            .onCompletion { if (it == null) emitAll(flowCollection(Subject.Repositories)) }
+            .map { getAll() }
+            .flowOn(Dispatchers.IO)
+
+        fun getEnabledStream(): Flow<List<Repository>> = flowOf(Unit)
+            .onCompletion { if (it == null) emitAll(flowCollection(Subject.Repositories)) }
+            .map { getEnabled() }
+            .flowOn(Dispatchers.IO)
+
+        private suspend fun getEnabled(): List<Repository> = withContext(Dispatchers.IO) {
+            db.query(
+                Schema.Repository.name,
+                selection = Pair(
+                    "${Schema.Repository.ROW_ENABLED} != 0 AND " +
+                        "${Schema.Repository.ROW_DELETED} == 0",
+                    emptyArray(),
+                ),
+                signal = null,
+            ).use { it.asSequence().map(::transform).toList() }
+        }
+
+        fun getAll(): List<Repository> {
+            return db.query(
+                Schema.Repository.name,
+                selection = Pair("${Schema.Repository.ROW_DELETED} == 0", emptyArray()),
+                signal = null,
+            ).use { it.asSequence().map(::transform).toList() }
+        }
+
+        fun getAllRemovedStream(): Flow<Map<Long, Boolean>> = flowOf(Unit)
+            .onCompletion { if (it == null) emitAll(flowCollection(Subject.Repositories)) }
+            .map { getAllDisabledDeleted() }
+            .flowOn(Dispatchers.IO)
+
+        private fun getAllDisabledDeleted(): Map<Long, Boolean> {
+            return db.query(
+                Schema.Repository.name,
+                columns = arrayOf(Schema.Repository.ROW_ID, Schema.Repository.ROW_DELETED),
+                selection = Pair(
+                    "${Schema.Repository.ROW_ENABLED} == 0 OR " +
+                        "${Schema.Repository.ROW_DELETED} != 0",
+                    emptyArray(),
+                ),
+                signal = null,
+            ).use { parentCursor ->
+                parentCursor.asSequence().associate {
+                    val idIndex = it.getColumnIndexOrThrow(Schema.Repository.ROW_ID)
+                    val isDeletedIndex = it.getColumnIndexOrThrow(Schema.Repository.ROW_DELETED)
+                    it.getLong(idIndex) to (it.getInt(isDeletedIndex) != 0)
+                }
+            }
+        }
+
+        fun markAsDeleted(id: Long) {
+            db.update(
+                Schema.Repository.name,
+                ContentValues().apply {
+                    put(Schema.Repository.ROW_DELETED, 1)
+                },
+                "${Schema.Repository.ROW_ID} = ?",
+                arrayOf(id.toString()),
+            )
+            notifyChanged(Subject.Repositories, Subject.Repository(id), Subject.Products)
+        }
+
+        fun cleanup(removedRepos: Map<Long, Boolean>) {
+            val result = removedRepos.map { (id, isDeleted) ->
+                val idsString = id.toString()
+                val productsCount = db.delete(
+                    Schema.Product.name,
+                    "${Schema.Product.ROW_REPOSITORY_ID} IN ($idsString)",
+                    null,
+                )
+                val categoriesCount = db.delete(
+                    Schema.Category.name,
+                    "${Schema.Category.ROW_REPOSITORY_ID} IN ($idsString)",
+                    null,
+                )
+                if (isDeleted) {
+                    db.delete(
+                        Schema.Repository.name,
+                        "${Schema.Repository.ROW_ID} IN ($id)",
+                        null,
+                    )
+                }
+                productsCount != 0 || categoriesCount != 0
+            }
+            if (result.any { it }) {
+                notifyChanged(Subject.Products)
+            }
+        }
+
+        fun importRepos(list: List<Repository>) {
+            db.transaction {
+                val currentAddresses = getAll().map { it.address }
+                val newRepos = list
+                    .filter { it.address !in currentAddresses }
+                newRepos.forEach { put(it) }
+                removeDuplicates()
+            }
+        }
+
+        fun query(signal: CancellationSignal?): Cursor {
+            return db.query(
+                Schema.Repository.name,
+                selection = Pair("${Schema.Repository.ROW_DELETED} == 0", emptyArray()),
+                orderBy = "${Schema.Repository.ROW_ENABLED} DESC",
+                signal = signal,
+            ).observable(Subject.Repositories)
+        }
+
+        fun transform(cursor: Cursor): Repository {
+            return cursor.getBlob(cursor.getColumnIndexOrThrow(Schema.Repository.ROW_DATA))
+                .jsonParse {
+                    it.repository().apply {
+                        this.id =
+                            cursor.getLong(cursor.getColumnIndexOrThrow(Schema.Repository.ROW_ID))
+                    }
+                }
+        }
+    }
+
+    object ProductAdapter {
+
+        fun getStream(packageName: String): Flow<List<Product>> = flowOf(Unit)
+            .onCompletion { if (it == null) emitAll(flowCollection(Subject.Products)) }
+            .map { get(packageName, null) }
+            .flowOn(Dispatchers.IO)
+
+        suspend fun getUpdates(skipSignatureCheck: Boolean): List<ProductItem> =
+            withContext(Dispatchers.IO) {
+                query(
+                    installed = true,
+                    updates = true,
+                    searchQuery = "",
+                    skipSignatureCheck = skipSignatureCheck,
+                    section = ProductItem.Section.All,
+                    order = SortOrder.NAME,
+                    signal = null,
+                ).use {
+                    it.asSequence()
+                        .map(ProductAdapter::transformItem)
+                        .toList()
+                }
+            }
+
+        fun getUpdatesStream(skipSignatureCheck: Boolean): Flow<List<ProductItem>> = flowOf(Unit)
+            .onCompletion { if (it == null) emitAll(flowCollection(Subject.Products)) }
+            // Crashes due to immediate retrieval of data?
+            .onEach { delay(50) }
+            .map { getUpdates(skipSignatureCheck) }
+            .flowOn(Dispatchers.IO)
+
+        fun get(packageName: String, signal: CancellationSignal?): List<Product> {
+            return db.query(
+                Schema.Product.name,
+                columns = arrayOf(
+                    Schema.Product.ROW_REPOSITORY_ID,
+                    Schema.Product.ROW_DESCRIPTION,
+                    Schema.Product.ROW_DATA,
+                ),
+                selection = Pair("${Schema.Product.ROW_PACKAGE_NAME} = ?", arrayOf(packageName)),
+                signal = signal,
+            ).use { it.asSequence().map(::transform).toList() }
+        }
+
+        fun getCountStream(repositoryId: Long): Flow<Int> = flowOf(Unit)
+            .onCompletion { if (it == null) emitAll(flowCollection(Subject.Products)) }
+            .map { getCount(repositoryId) }
+            .flowOn(Dispatchers.IO)
+
+        private fun getCount(repositoryId: Long): Int {
+            return db.query(
+                Schema.Product.name,
+                columns = arrayOf("COUNT (*)"),
+                selection = Pair(
+                    "${Schema.Product.ROW_REPOSITORY_ID} = ?",
+                    arrayOf(repositoryId.toString()),
+                ),
+            ).use { it.firstOrNull()?.getInt(0) ?: 0 }
+        }
+
+        fun query(
+            installed: Boolean,
+            updates: Boolean,
+            skipSignatureCheck: Boolean = false,
+            searchQuery: String,
+            section: ProductItem.Section,
+            order: SortOrder,
+            signal: CancellationSignal?,
+        ): Cursor {
+            val builder = QueryBuilder()
+
+            val signatureMatches = if (skipSignatureCheck) "1"
+            else """installed.${Schema.Installed.ROW_SIGNATURE} IS NOT NULL AND
+                product.${Schema.Product.ROW_SIGNATURES} LIKE ('%.' || installed.${Schema.Installed.ROW_SIGNATURE} || '.%') AND
+                product.${Schema.Product.ROW_SIGNATURES} != ''"""
+
+            builder += """SELECT product.rowid AS _id, product.${Schema.Product.ROW_REPOSITORY_ID},
+        product.${Schema.Product.ROW_PACKAGE_NAME}, product.${Schema.Product.ROW_NAME},
+        product.${Schema.Product.ROW_SUMMARY}, installed.${Schema.Installed.ROW_VERSION},
+        (COALESCE(lock.${Schema.Lock.ROW_VERSION_CODE}, -1) NOT IN (0, product.${Schema.Product.ROW_VERSION_CODE}) AND
+        product.${Schema.Product.ROW_COMPATIBLE} != 0 AND product.${Schema.Product.ROW_VERSION_CODE} >
+        COALESCE(installed.${Schema.Installed.ROW_VERSION_CODE}, 0xffffffff) AND $signatureMatches)
+        AS ${Schema.Synthetic.ROW_CAN_UPDATE}, product.${Schema.Product.ROW_COMPATIBLE},
+        product.${Schema.Product.ROW_DATA_ITEM},"""
+
+            if (searchQuery.isNotEmpty()) {
+                builder += """(((product.${Schema.Product.ROW_NAME} LIKE ? OR
+          product.${Schema.Product.ROW_SUMMARY} LIKE ?) * 7) |
+          ((product.${Schema.Product.ROW_PACKAGE_NAME} LIKE ?) * 3) |
+          (product.${Schema.Product.ROW_DESCRIPTION} LIKE ?)) AS ${Schema.Synthetic.ROW_MATCH_RANK},"""
+                builder %= List(4) { "%$searchQuery%" }
+            } else {
+                builder += "0 AS ${Schema.Synthetic.ROW_MATCH_RANK},"
+            }
+
+            builder += """MAX((product.${Schema.Product.ROW_COMPATIBLE} AND
+        (installed.${Schema.Installed.ROW_SIGNATURE} IS NULL OR $signatureMatches)) ||
+        PRINTF('%016X', product.${Schema.Product.ROW_VERSION_CODE})) FROM ${Schema.Product.name} AS product"""
+            builder += """JOIN ${Schema.Repository.name} AS repository
+        ON product.${Schema.Product.ROW_REPOSITORY_ID} = repository.${Schema.Repository.ROW_ID}"""
+            builder += """LEFT JOIN ${Schema.Lock.name} AS lock
+        ON product.${Schema.Product.ROW_PACKAGE_NAME} = lock.${Schema.Lock.ROW_PACKAGE_NAME}"""
+
+            if (!installed && !updates) {
+                builder += "LEFT"
+            }
+            builder += """JOIN ${Schema.Installed.name} AS installed
+        ON product.${Schema.Product.ROW_PACKAGE_NAME} = installed.${Schema.Installed.ROW_PACKAGE_NAME}"""
+
+            if (section is ProductItem.Section.Category) {
+                builder += """JOIN ${Schema.Category.name} AS category
+          ON product.${Schema.Product.ROW_PACKAGE_NAME} = category.${Schema.Product.ROW_PACKAGE_NAME}"""
+            }
+
+            builder += """WHERE repository.${Schema.Repository.ROW_ENABLED} != 0 AND
+        repository.${Schema.Repository.ROW_DELETED} == 0"""
+
+            if (section is ProductItem.Section.Category) {
+                builder += "AND category.${Schema.Category.ROW_NAME} = ?"
+                builder %= section.name
+            } else if (section is ProductItem.Section.Repository) {
+                builder += "AND product.${Schema.Product.ROW_REPOSITORY_ID} = ?"
+                builder %= section.id.toString()
+            }
+
+            if (searchQuery.isNotEmpty()) {
+                builder += """AND ${Schema.Synthetic.ROW_MATCH_RANK} > 0"""
+            }
+
+            builder += "GROUP BY product.${Schema.Product.ROW_PACKAGE_NAME} HAVING 1"
+
+            if (updates) {
+                builder += "AND ${Schema.Synthetic.ROW_CAN_UPDATE}"
+            }
+            builder += "ORDER BY"
+
+            if (searchQuery.isNotEmpty()) {
+                builder += """${Schema.Synthetic.ROW_MATCH_RANK} DESC,"""
+            }
+
+            when (order) {
+                SortOrder.UPDATED -> builder += "product.${Schema.Product.ROW_UPDATED} DESC,"
+                SortOrder.ADDED -> builder += "product.${Schema.Product.ROW_ADDED} DESC,"
+                SortOrder.NAME -> Unit
+            }::class
+            builder += "product.${Schema.Product.ROW_NAME} COLLATE LOCALIZED ASC"
+
+            return builder.query(db, signal).observable(Subject.Products)
+        }
+
+        private fun transform(cursor: Cursor): Product {
+            return cursor.getBlob(cursor.getColumnIndexOrThrow(Schema.Product.ROW_DATA))
+                .jsonParse {
+                    it.product().apply {
+                        this.repositoryId = cursor
+                            .getLong(cursor.getColumnIndexOrThrow(Schema.Product.ROW_REPOSITORY_ID))
+                        this.description = cursor
+                            .getString(cursor.getColumnIndexOrThrow(Schema.Product.ROW_DESCRIPTION))
+                    }
+                }
+        }
+
+        fun transformPackageName(cursor: Cursor): String {
+            return cursor.getString(cursor.getColumnIndexOrThrow(Schema.Product.ROW_PACKAGE_NAME))
+        }
+
+        fun transformItem(cursor: Cursor): ProductItem {
+            return cursor.getBlob(cursor.getColumnIndexOrThrow(Schema.Product.ROW_DATA_ITEM))
+                .jsonParse {
+                    it.productItem().apply {
+                        this.repositoryId = cursor
+                            .getLong(cursor.getColumnIndexOrThrow(Schema.Product.ROW_REPOSITORY_ID))
+                        this.packageName = cursor
+                            .getString(cursor.getColumnIndexOrThrow(Schema.Product.ROW_PACKAGE_NAME))
+                        this.name = cursor
+                            .getString(cursor.getColumnIndexOrThrow(Schema.Product.ROW_NAME))
+                        this.summary = cursor
+                            .getString(cursor.getColumnIndexOrThrow(Schema.Product.ROW_SUMMARY))
+                        this.installedVersion = cursor
+                            .getString(cursor.getColumnIndexOrThrow(Schema.Installed.ROW_VERSION))
+                            .orEmpty()
+                        this.compatible = cursor
+                            .getInt(cursor.getColumnIndexOrThrow(Schema.Product.ROW_COMPATIBLE)) != 0
+                        this.canUpdate = cursor
+                            .getInt(cursor.getColumnIndexOrThrow(Schema.Synthetic.ROW_CAN_UPDATE)) != 0
+                        this.matchRank = cursor
+                            .getInt(cursor.getColumnIndexOrThrow(Schema.Synthetic.ROW_MATCH_RANK))
+                    }
+                }
+        }
+    }
+
+    object CategoryAdapter {
+
+        fun getAllStream(): Flow<Set<String>> = flowOf(Unit)
+            .onCompletion { if (it == null) emitAll(flowCollection(Subject.Products)) }
+            .map { getAll() }
+            .flowOn(Dispatchers.IO)
+
+        private suspend fun getAll(): Set<String> = withContext(Dispatchers.IO) {
+            val builder = QueryBuilder()
+
+            builder += """SELECT DISTINCT category.${Schema.Category.ROW_NAME}
+        FROM ${Schema.Category.name} AS category
+        JOIN ${Schema.Repository.name} AS repository
+        ON category.${Schema.Category.ROW_REPOSITORY_ID} = repository.${Schema.Repository.ROW_ID}
+        WHERE repository.${Schema.Repository.ROW_ENABLED} != 0 AND
+        repository.${Schema.Repository.ROW_DELETED} == 0"""
+
+            builder.query(db, null).use { cursor ->
+                cursor.asSequence().map {
+                    it.getString(it.getColumnIndexOrThrow(Schema.Category.ROW_NAME))
+                }.toSet()
+            }
+        }
+    }
+
+    object InstalledAdapter {
+
+        fun getStream(packageName: String): Flow<InstalledItem?> = flowOf(Unit)
+            .onCompletion { if (it == null) emitAll(flowCollection(Subject.Products)) }
+            .map { get(packageName, null) }
+            .flowOn(Dispatchers.IO)
+
+        fun get(packageName: String, signal: CancellationSignal?): InstalledItem? {
+            return db.query(
+                Schema.Installed.name,
+                columns = arrayOf(
+                    Schema.Installed.ROW_PACKAGE_NAME,
+                    Schema.Installed.ROW_VERSION,
+                    Schema.Installed.ROW_VERSION_CODE,
+                    Schema.Installed.ROW_SIGNATURE,
+                ),
+                selection = Pair("${Schema.Installed.ROW_PACKAGE_NAME} = ?", arrayOf(packageName)),
+                signal = signal,
+            ).use { it.firstOrNull()?.let(::transform) }
+        }
+
+        private fun put(installedItem: InstalledItem, notify: Boolean) {
+            db.insertOrReplace(
+                true,
+                Schema.Installed.name,
+                ContentValues().apply {
+                    put(Schema.Installed.ROW_PACKAGE_NAME, installedItem.packageName)
+                    put(Schema.Installed.ROW_VERSION, installedItem.version)
+                    put(Schema.Installed.ROW_VERSION_CODE, installedItem.versionCode)
+                    put(Schema.Installed.ROW_SIGNATURE, installedItem.signature)
+                },
+            )
+            if (notify) {
+                notifyChanged(Subject.Products)
+            }
+        }
+
+        fun put(installedItem: InstalledItem) = put(installedItem, true)
+
+        fun putAll(installedItems: List<InstalledItem>) {
+            db.transaction {
+                db.delete(Schema.Installed.name, null, null)
+                installedItems.forEach { put(it, false) }
+            }
+        }
+
+        fun delete(packageName: String) {
+            val count = db.delete(
+                Schema.Installed.name,
+                "${Schema.Installed.ROW_PACKAGE_NAME} = ?",
+                arrayOf(packageName),
+            )
+            if (count > 0) {
+                notifyChanged(Subject.Products)
+            }
+        }
+
+        private fun transform(cursor: Cursor): InstalledItem {
+            return InstalledItem(
+                cursor.getString(cursor.getColumnIndexOrThrow(Schema.Installed.ROW_PACKAGE_NAME)),
+                cursor.getString(cursor.getColumnIndexOrThrow(Schema.Installed.ROW_VERSION)),
+                cursor.getLong(cursor.getColumnIndexOrThrow(Schema.Installed.ROW_VERSION_CODE)),
+                cursor.getString(cursor.getColumnIndexOrThrow(Schema.Installed.ROW_SIGNATURE)),
+            )
+        }
+    }
+
+    object LockAdapter {
+        private fun put(lock: Pair<String, Long>, notify: Boolean) {
+            db.insertOrReplace(
+                true,
+                Schema.Lock.name,
+                ContentValues().apply {
+                    put(Schema.Lock.ROW_PACKAGE_NAME, lock.first)
+                    put(Schema.Lock.ROW_VERSION_CODE, lock.second)
+                },
+            )
+            if (notify) {
+                notifyChanged(Subject.Products)
+            }
+        }
+
+        fun put(lock: Pair<String, Long>) = put(lock, true)
+
+        fun putAll(locks: List<Pair<String, Long>>) {
+            db.transaction {
+                db.delete(Schema.Lock.name, null, null)
+                locks.forEach { put(it, false) }
+            }
+        }
+
+        fun delete(packageName: String) {
+            db.delete(Schema.Lock.name, "${Schema.Lock.ROW_PACKAGE_NAME} = ?", arrayOf(packageName))
+            notifyChanged(Subject.Products)
+        }
+    }
+
+    object UpdaterAdapter {
+        private val Table.temporaryName: String
+            get() = "${name}_temporary"
+
+        fun createTemporaryTable() {
+            db.execSQL("DROP TABLE IF EXISTS ${Schema.Product.temporaryName}")
+            db.execSQL("DROP TABLE IF EXISTS ${Schema.Category.temporaryName}")
+            db.execSQL(Schema.Product.formatCreateTable(Schema.Product.temporaryName))
+            db.execSQL(Schema.Category.formatCreateTable(Schema.Category.temporaryName))
+        }
+
+        fun putTemporary(products: List<Product>) {
+            db.transaction {
+                for (product in products) {
+                    // Format signatures like ".signature1.signature2." for easier select
+                    val signatures = product.signatures.joinToString { ".$it" }
+                        .let { if (it.isNotEmpty()) "$it." else "" }
+                    db.insertOrReplace(
+                        true,
+                        Schema.Product.temporaryName,
+                        ContentValues().apply {
+                            put(Schema.Product.ROW_REPOSITORY_ID, product.repositoryId)
+                            put(Schema.Product.ROW_PACKAGE_NAME, product.packageName)
+                            put(Schema.Product.ROW_NAME, product.name)
+                            put(Schema.Product.ROW_SUMMARY, product.summary)
+                            put(Schema.Product.ROW_DESCRIPTION, product.description)
+                            put(Schema.Product.ROW_ADDED, product.added)
+                            put(Schema.Product.ROW_UPDATED, product.updated)
+                            put(Schema.Product.ROW_VERSION_CODE, product.versionCode)
+                            put(Schema.Product.ROW_SIGNATURES, signatures)
+                            put(Schema.Product.ROW_COMPATIBLE, if (product.compatible) 1 else 0)
+                            put(Schema.Product.ROW_DATA, jsonGenerate(product::serialize))
+                            put(
+                                Schema.Product.ROW_DATA_ITEM,
+                                jsonGenerate(product.item()::serialize),
+                            )
+                        },
+                    )
+                    for (category in product.categories) {
+                        db.insertOrReplace(
+                            true,
+                            Schema.Category.temporaryName,
+                            ContentValues().apply {
+                                put(Schema.Category.ROW_REPOSITORY_ID, product.repositoryId)
+                                put(Schema.Category.ROW_PACKAGE_NAME, product.packageName)
+                                put(Schema.Category.ROW_NAME, category)
+                            },
+                        )
+                    }
+                }
+            }
+        }
+
+        fun finishTemporary(repository: Repository, success: Boolean) {
+            if (success) {
+                db.transaction {
+                    db.delete(
+                        Schema.Product.name,
+                        "${Schema.Product.ROW_REPOSITORY_ID} = ?",
+                        arrayOf(repository.id.toString()),
+                    )
+                    db.delete(
+                        Schema.Category.name,
+                        "${Schema.Category.ROW_REPOSITORY_ID} = ?",
+                        arrayOf(repository.id.toString()),
+                    )
+                    db.execSQL(
+                        "INSERT INTO ${Schema.Product.name} SELECT * " +
+                            "FROM ${Schema.Product.temporaryName}",
+                    )
+                    db.execSQL(
+                        "INSERT INTO ${Schema.Category.name} SELECT * " +
+                            "FROM ${Schema.Category.temporaryName}",
+                    )
+                    RepositoryAdapter.putWithoutNotification(repository, true, db)
+                    db.execSQL("DROP TABLE IF EXISTS ${Schema.Product.temporaryName}")
+                    db.execSQL("DROP TABLE IF EXISTS ${Schema.Category.temporaryName}")
+                }
+                notifyChanged(
+                    Subject.Repositories,
+                    Subject.Repository(repository.id),
+                    Subject.Products,
+                )
+            } else {
+                db.execSQL("DROP TABLE IF EXISTS ${Schema.Product.temporaryName}")
+                db.execSQL("DROP TABLE IF EXISTS ${Schema.Category.temporaryName}")
+            }
+        }
+    }
+}

app/src/main/kotlin/com/looker/droidify/database/ObservableCursor.kt

@@ -0,0 +1,64 @@
+package com.looker.droidify.database
+
+import android.database.ContentObservable
+import android.database.ContentObserver
+import android.database.Cursor
+import android.database.CursorWrapper
+
+class ObservableCursor(
+    cursor: Cursor,
+    private val observable: (
+        register: Boolean,
+        observer: () -> Unit
+    ) -> Unit
+) : CursorWrapper(cursor) {
+    private var registered = false
+    private val contentObservable = ContentObservable()
+
+    private val onChange: () -> Unit = {
+        contentObservable.dispatchChange(false, null)
+    }
+
+    init {
+        observable(true, onChange)
+        registered = true
+    }
+
+    override fun registerContentObserver(observer: ContentObserver) {
+        super.registerContentObserver(observer)
+        contentObservable.registerObserver(observer)
+    }
+
+    override fun unregisterContentObserver(observer: ContentObserver) {
+        super.unregisterContentObserver(observer)
+        contentObservable.unregisterObserver(observer)
+    }
+
+    @Deprecated("Deprecated in Java")
+    @Suppress("DEPRECATION")
+    override fun requery(): Boolean {
+        if (!registered) {
+            observable(true, onChange)
+            registered = true
+        }
+        return super.requery()
+    }
+
+    @Deprecated("Deprecated in Java")
+    @Suppress("DEPRECATION")
+    override fun deactivate() {
+        super.deactivate()
+        deactivateOrClose()
+    }
+
+    override fun close() {
+        super.close()
+        contentObservable.unregisterAll()
+        deactivateOrClose()
+    }
+
+    private fun deactivateOrClose() {
+        observable(false, onChange)
+        registered = false
+    }
+}

app/src/main/kotlin/com/looker/droidify/database/QueryBuilder.kt

@@ -0,0 +1,94 @@
+package com.looker.droidify.database
+
+import android.database.Cursor
+import android.database.sqlite.SQLiteDatabase
+import android.os.CancellationSignal
+import com.looker.droidify.BuildConfig
+import com.looker.droidify.utility.common.extension.asSequence
+import com.looker.droidify.utility.common.log
+
+class QueryBuilder {
+
+    private val builder = StringBuilder(256)
+    private val arguments = mutableListOf<String>()
+
+    operator fun plusAssign(query: String) {
+        if (builder.isNotEmpty()) {
+            builder.append(" ")
+        }
+        builder.trimAndJoin(query)
+    }
+
+    operator fun remAssign(argument: String) {
+        this.arguments += argument
+    }
+
+    operator fun remAssign(arguments: List<String>) {
+        this.arguments += arguments
+    }
+
+    fun query(db: SQLiteDatabase, signal: CancellationSignal?): Cursor {
+        val query = builder.toString()
+        val arguments = arguments.toTypedArray()
+        if (BuildConfig.DEBUG) {
+            synchronized(QueryBuilder::class.java) {
+                log(query)
+                db.rawQuery("EXPLAIN QUERY PLAN $query", arguments).use {
+                    it.asSequence()
+                        .forEach { log(":: ${it.getString(it.getColumnIndex("detail"))}") }
+                }
+            }
+        }
+        return db.rawQuery(query, arguments, signal)
+    }
+}
+
+fun StringBuilder.trimAndJoin(
+    input: String,
+) {
+    var isFirstLine = true
+    var startOfLine = 0
+    for (i in input.indices) {
+        val char = input[i]
+        when {
+            char == '\n' -> {
+                trimAndAppendLine(input, startOfLine, i, this, isFirstLine)
+                isFirstLine = false
+                startOfLine = i + 1
+            }
+
+            else -> {
+                if (i == input.lastIndex) {
+                    trimAndAppendLine(input, startOfLine, i + 1, this, isFirstLine)
+                }
+            }
+        }
+    }
+}
+
+private fun trimAndAppendLine(
+    input: String,
+    start: Int,
+    end: Int,
+    builder: StringBuilder,
+    isFirstLine: Boolean,
+) {
+    var lineStart = start
+    var lineEnd = end - 1
+
+    while (lineStart <= lineEnd && input[lineStart].isWhitespace()) {
+        lineStart++
+    }
+
+    while (lineEnd >= lineStart && input[lineEnd].isWhitespace()) {
+        lineEnd--
+    }
+
+    if (lineStart <= lineEnd) {
+        if (!isFirstLine) {
+            builder.append(' ')
+        }
+        builder.append(input, lineStart, lineEnd + 1)
+    }
+}
+

app/src/main/kotlin/com/looker/droidify/database/QueryLoader.kt

@@ -0,0 +1,94 @@
+package com.looker.droidify.database
+
+import android.content.Context
+import android.database.Cursor
+import android.os.CancellationSignal
+import android.os.OperationCanceledException
+import androidx.loader.content.AsyncTaskLoader
+
+class QueryLoader(context: Context, private val query: (CancellationSignal) -> Cursor?) :
+    AsyncTaskLoader<Cursor>(context) {
+    private val observer = ForceLoadContentObserver()
+    private var cancellationSignal: CancellationSignal? = null
+    private var cursor: Cursor? = null
+
+    override fun loadInBackground(): Cursor? {
+        val cancellationSignal = synchronized(this) {
+            if (isLoadInBackgroundCanceled) {
+                throw OperationCanceledException()
+            }
+            val cancellationSignal = CancellationSignal()
+            this.cancellationSignal = cancellationSignal
+            cancellationSignal
+        }
+        try {
+            val cursor = query(cancellationSignal)
+            if (cursor != null) {
+                try {
+                    cursor.count // Ensure the cursor window is filled
+                    cursor.registerContentObserver(observer)
+                } catch (e: Exception) {
+                    cursor.close()
+                    throw e
+                }
+            }
+            return cursor
+        } finally {
+            synchronized(this) {
+                this.cancellationSignal = null
+            }
+        }
+    }
+
+    override fun cancelLoadInBackground() {
+        super.cancelLoadInBackground()
+
+        synchronized(this) {
+            cancellationSignal?.cancel()
+        }
+    }
+
+    override fun deliverResult(data: Cursor?) {
+        if (isReset) {
+            data?.close()
+        } else {
+            val oldCursor = cursor
+            cursor = data
+            if (isStarted) {
+                super.deliverResult(data)
+            }
+            if (oldCursor != data) {
+                oldCursor.closeIfNeeded()
+            }
+        }
+    }
+
+    override fun onStartLoading() {
+        cursor?.let(this::deliverResult)
+        if (takeContentChanged() || cursor == null) {
+            forceLoad()
+        }
+    }
+
+    override fun onStopLoading() {
+        cancelLoad()
+    }
+
+    override fun onCanceled(data: Cursor?) {
+        data.closeIfNeeded()
+    }
+
+    override fun onReset() {
+        super.onReset()
+
+        stopLoading()
+        cursor.closeIfNeeded()
+        cursor = null
+    }
+
+    private fun Cursor?.closeIfNeeded() {
+        if (this != null && !isClosed) {
+            close()
+        }
+    }
+}

app/src/main/kotlin/com/looker/droidify/database/RepositoryExporter.kt

@@ -0,0 +1,73 @@
+package com.looker.droidify.database
+
+import android.content.Context
+import android.net.Uri
+import com.fasterxml.jackson.core.JsonToken
+import com.looker.droidify.utility.common.Exporter
+import com.looker.droidify.utility.common.extension.Json
+import com.looker.droidify.utility.common.extension.forEach
+import com.looker.droidify.utility.common.extension.forEachKey
+import com.looker.droidify.utility.common.extension.parseDictionary
+import com.looker.droidify.utility.common.extension.writeArray
+import com.looker.droidify.utility.common.extension.writeDictionary
+import com.looker.droidify.di.ApplicationScope
+import com.looker.droidify.di.IoDispatcher
+import com.looker.droidify.model.Repository
+import com.looker.droidify.utility.serialization.repository
+import com.looker.droidify.utility.serialization.serialize
+import dagger.hilt.android.qualifiers.ApplicationContext
+import javax.inject.Inject
+import javax.inject.Singleton
+import kotlinx.coroutines.CoroutineDispatcher
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.launch
+import kotlinx.coroutines.withContext
+
+@Singleton
+class RepositoryExporter @Inject constructor(
+    @ApplicationContext private val context: Context,
+    @ApplicationScope private val scope: CoroutineScope,
+    @IoDispatcher private val ioDispatcher: CoroutineDispatcher
+) : Exporter<List<Repository>> {
+    override suspend fun export(item: List<Repository>, target: Uri) {
+        scope.launch(ioDispatcher) {
+            val stream = context.contentResolver.openOutputStream(target)
+            Json.factory.createGenerator(stream).use { generator ->
+                generator.writeDictionary {
+                    writeArray("repositories") {
+                        item.map {
+                            it.copy(
+                                id = -1,
+                                mirrors = if (it.enabled) it.mirrors else emptyList(),
+                                lastModified = "",
+                                entityTag = ""
+                            )
+                        }.forEach { repo ->
+                            writeDictionary {
+                                repo.serialize(this)
+                            }
+                        }
+                    }
+                }
+            }
+        }
+    }
+
+    override suspend fun import(target: Uri): List<Repository> = withContext(ioDispatcher) {
+        val list = mutableListOf<Repository>()
+        val stream = context.contentResolver.openInputStream(target)
+        Json.factory.createParser(stream).use { generator ->
+            generator?.parseDictionary {
+                forEachKey {
+                    if (it.array("repositories")) {
+                        forEach(JsonToken.START_OBJECT) {
+                            val repo = repository()
+                            list.add(repo)
+                        }
+                    }
+                }
+            }
+        }
+        list
+    }
+}

app/src/main/kotlin/com/looker/droidify/datastore/PreferenceSettingsRepository.kt

@@ -0,0 +1,217 @@
+package com.looker.droidify.datastore
+
+import android.net.Uri
+import android.util.Log
+import androidx.datastore.core.DataStore
+import androidx.datastore.core.IOException
+import androidx.datastore.preferences.core.MutablePreferences
+import androidx.datastore.preferences.core.Preferences
+import androidx.datastore.preferences.core.booleanPreferencesKey
+import androidx.datastore.preferences.core.edit
+import androidx.datastore.preferences.core.intPreferencesKey
+import androidx.datastore.preferences.core.longPreferencesKey
+import androidx.datastore.preferences.core.stringPreferencesKey
+import androidx.datastore.preferences.core.stringSetPreferencesKey
+import com.looker.droidify.datastore.model.AutoSync
+import com.looker.droidify.datastore.model.InstallerType
+import com.looker.droidify.datastore.model.ProxyPreference
+import com.looker.droidify.datastore.model.ProxyType
+import com.looker.droidify.datastore.model.SortOrder
+import com.looker.droidify.datastore.model.Theme
+import com.looker.droidify.utility.common.Exporter
+import com.looker.droidify.utility.common.extension.updateAsMutable
+import kotlinx.coroutines.flow.Flow
+import kotlinx.coroutines.flow.catch
+import kotlinx.coroutines.flow.first
+import kotlinx.coroutines.flow.map
+import kotlinx.datetime.Clock
+import kotlinx.datetime.Instant
+import kotlin.time.Duration
+import kotlin.time.Duration.Companion.hours
+
+class PreferenceSettingsRepository(
+    private val dataStore: DataStore<Preferences>,
+    private val exporter: Exporter<Settings>,
+) : SettingsRepository {
+    override val data: Flow<Settings> = dataStore.data
+        .catch { exception ->
+            if (exception is IOException) {
+                Log.e("TAG", "Error reading preferences.", exception)
+            } else {
+                throw exception
+            }
+        }.map(::mapSettings)
+
+    override suspend fun getInitial(): Settings {
+        return data.first()
+    }
+
+    override suspend fun export(target: Uri) {
+        val currentSettings = getInitial()
+        exporter.export(currentSettings, target)
+    }
+
+    override suspend fun import(target: Uri) {
+        val importedSettings = exporter.import(target)
+        val updatedFavorites = importedSettings.favouriteApps +
+            getInitial().favouriteApps
+        val updatedSettings = importedSettings.copy(favouriteApps = updatedFavorites)
+        dataStore.edit {
+            it.setting(updatedSettings)
+        }
+    }
+
+    override suspend fun setLanguage(language: String) =
+        LANGUAGE.update(language)
+
+    override suspend fun enableIncompatibleVersion(enable: Boolean) =
+        INCOMPATIBLE_VERSIONS.update(enable)
+
+    override suspend fun enableNotifyUpdates(enable: Boolean) =
+        NOTIFY_UPDATES.update(enable)
+
+    override suspend fun enableUnstableUpdates(enable: Boolean) =
+        UNSTABLE_UPDATES.update(enable)
+
+    override suspend fun setIgnoreSignature(enable: Boolean) =
+        IGNORE_SIGNATURE.update(enable)
+
+    override suspend fun setTheme(theme: Theme) =
+        THEME.update(theme.name)
+
+    override suspend fun setDynamicTheme(enable: Boolean) =
+        DYNAMIC_THEME.update(enable)
+
+    override suspend fun setInstallerType(installerType: InstallerType) =
+        INSTALLER_TYPE.update(installerType.name)
+
+    override suspend fun setAutoUpdate(allow: Boolean) =
+        AUTO_UPDATE.update(allow)
+
+    override suspend fun setAutoSync(autoSync: AutoSync) =
+        AUTO_SYNC.update(autoSync.name)
+
+    override suspend fun setSortOrder(sortOrder: SortOrder) =
+        SORT_ORDER.update(sortOrder.name)
+
+    override suspend fun setProxyType(proxyType: ProxyType) =
+        PROXY_TYPE.update(proxyType.name)
+
+    override suspend fun setProxyHost(proxyHost: String) =
+        PROXY_HOST.update(proxyHost)
+
+    override suspend fun setProxyPort(proxyPort: Int) =
+        PROXY_PORT.update(proxyPort)
+
+    override suspend fun setCleanUpInterval(interval: Duration) =
+        CLEAN_UP_INTERVAL.update(interval.inWholeHours)
+
+    override suspend fun setCleanupInstant() =
+        LAST_CLEAN_UP.update(Clock.System.now().toEpochMilliseconds())
+
+    override suspend fun setHomeScreenSwiping(value: Boolean) =
+        HOME_SCREEN_SWIPING.update(value)
+
+    override suspend fun toggleFavourites(packageName: String) {
+        dataStore.edit { preference ->
+            val currentSet = preference[FAVOURITE_APPS] ?: emptySet()
+            val newSet = currentSet.updateAsMutable {
+                if (!add(packageName)) remove(packageName)
+            }
+            preference[FAVOURITE_APPS] = newSet
+        }
+    }
+
+    private fun mapSettings(preferences: Preferences): Settings {
+        val installerType =
+            InstallerType.valueOf(preferences[INSTALLER_TYPE] ?: InstallerType.Default.name)
+
+        val language = preferences[LANGUAGE] ?: "system"
+        val incompatibleVersions = preferences[INCOMPATIBLE_VERSIONS] ?: false
+        val notifyUpdate = preferences[NOTIFY_UPDATES] ?: true
+        val unstableUpdate = preferences[UNSTABLE_UPDATES] ?: false
+        val ignoreSignature = preferences[IGNORE_SIGNATURE] ?: false
+        val theme = Theme.valueOf(preferences[THEME] ?: Theme.SYSTEM.name)
+        val dynamicTheme = preferences[DYNAMIC_THEME] ?: false
+        val autoUpdate = preferences[AUTO_UPDATE] ?: false
+        val autoSync = AutoSync.valueOf(preferences[AUTO_SYNC] ?: AutoSync.WIFI_ONLY.name)
+        val sortOrder = SortOrder.valueOf(preferences[SORT_ORDER] ?: SortOrder.UPDATED.name)
+        val type = ProxyType.valueOf(preferences[PROXY_TYPE] ?: ProxyType.DIRECT.name)
+        val host = preferences[PROXY_HOST] ?: "localhost"
+        val port = preferences[PROXY_PORT] ?: 9050
+        val proxy = ProxyPreference(type = type, host = host, port = port)
+        val cleanUpInterval = preferences[CLEAN_UP_INTERVAL]?.hours ?: 12L.hours
+        val lastCleanup = preferences[LAST_CLEAN_UP]?.let { Instant.fromEpochMilliseconds(it) }
+        val favouriteApps = preferences[FAVOURITE_APPS] ?: emptySet()
+        val homeScreenSwiping = preferences[HOME_SCREEN_SWIPING] ?: true
+
+        return Settings(
+            language = language,
+            incompatibleVersions = incompatibleVersions,
+            notifyUpdate = notifyUpdate,
+            unstableUpdate = unstableUpdate,
+            ignoreSignature = ignoreSignature,
+            theme = theme,
+            dynamicTheme = dynamicTheme,
+            installerType = installerType,
+            autoUpdate = autoUpdate,
+            autoSync = autoSync,
+            sortOrder = sortOrder,
+            proxy = proxy,
+            cleanUpInterval = cleanUpInterval,
+            lastCleanup = lastCleanup,
+            favouriteApps = favouriteApps,
+            homeScreenSwiping = homeScreenSwiping,
+        )
+    }
+
+    private suspend inline fun <T> Preferences.Key<T>.update(newValue: T) {
+        dataStore.edit { preferences ->
+            preferences[this] = newValue
+        }
+    }
+
+    companion object PreferencesKeys {
+        val LANGUAGE = stringPreferencesKey("key_language")
+        val INCOMPATIBLE_VERSIONS = booleanPreferencesKey("key_incompatible_versions")
+        val NOTIFY_UPDATES = booleanPreferencesKey("key_notify_updates")
+        val UNSTABLE_UPDATES = booleanPreferencesKey("key_unstable_updates")
+        val IGNORE_SIGNATURE = booleanPreferencesKey("key_ignore_signature")
+        val DYNAMIC_THEME = booleanPreferencesKey("key_dynamic_theme")
+        val AUTO_UPDATE = booleanPreferencesKey("key_auto_updates")
+        val PROXY_HOST = stringPreferencesKey("key_proxy_host")
+        val PROXY_PORT = intPreferencesKey("key_proxy_port")
+        val CLEAN_UP_INTERVAL = longPreferencesKey("key_clean_up_interval")
+        val LAST_CLEAN_UP = longPreferencesKey("key_last_clean_up_time")
+        val FAVOURITE_APPS = stringSetPreferencesKey("key_favourite_apps")
+        val HOME_SCREEN_SWIPING = booleanPreferencesKey("key_home_swiping")
+
+        // Enums
+        val THEME = stringPreferencesKey("key_theme")
+        val INSTALLER_TYPE = stringPreferencesKey("key_installer_type")
+        val AUTO_SYNC = stringPreferencesKey("key_auto_sync")
+        val SORT_ORDER = stringPreferencesKey("key_sort_order")
+        val PROXY_TYPE = stringPreferencesKey("key_proxy_type")
+
+        fun MutablePreferences.setting(settings: Settings): Preferences {
+            set(LANGUAGE, settings.language)
+            set(INCOMPATIBLE_VERSIONS, settings.incompatibleVersions)
+            set(NOTIFY_UPDATES, settings.notifyUpdate)
+            set(UNSTABLE_UPDATES, settings.unstableUpdate)
+            set(THEME, settings.theme.name)
+            set(DYNAMIC_THEME, settings.dynamicTheme)
+            set(INSTALLER_TYPE, settings.installerType.name)
+            set(AUTO_UPDATE, settings.autoUpdate)
+            set(AUTO_SYNC, settings.autoSync.name)
+            set(SORT_ORDER, settings.sortOrder.name)
+            set(PROXY_TYPE, settings.proxy.type.name)
+            set(PROXY_HOST, settings.proxy.host)
+            set(PROXY_PORT, settings.proxy.port)
+            set(CLEAN_UP_INTERVAL, settings.cleanUpInterval.inWholeHours)
+            set(LAST_CLEAN_UP, settings.lastCleanup?.toEpochMilliseconds() ?: 0L)
+            set(FAVOURITE_APPS, settings.favouriteApps)
+            set(HOME_SCREEN_SWIPING, settings.homeScreenSwiping)
+            return this.toPreferences()
+        }
+    }
+}

app/src/main/kotlin/com/looker/droidify/datastore/Settings.kt

@@ -0,0 +1,67 @@
+package com.looker.droidify.datastore
+
+import androidx.datastore.core.Serializer
+import com.looker.droidify.datastore.model.AutoSync
+import com.looker.droidify.datastore.model.InstallerType
+import com.looker.droidify.datastore.model.ProxyPreference
+import com.looker.droidify.datastore.model.SortOrder
+import com.looker.droidify.datastore.model.Theme
+import java.io.IOException
+import java.io.InputStream
+import java.io.OutputStream
+import kotlin.time.Duration
+import kotlin.time.Duration.Companion.hours
+import kotlinx.datetime.Instant
+import kotlinx.serialization.ExperimentalSerializationApi
+import kotlinx.serialization.Serializable
+import kotlinx.serialization.SerializationException
+import kotlinx.serialization.json.Json
+import kotlinx.serialization.json.decodeFromStream
+import kotlinx.serialization.json.encodeToStream
+
+@Serializable
+data class Settings(
+    val language: String = "system",
+    val incompatibleVersions: Boolean = false,
+    val notifyUpdate: Boolean = true,
+    val unstableUpdate: Boolean = false,
+    val ignoreSignature: Boolean = false,
+    val theme: Theme = Theme.SYSTEM,
+    val dynamicTheme: Boolean = false,
+    val installerType: InstallerType = InstallerType.Default,
+    val autoUpdate: Boolean = false,
+    val autoSync: AutoSync = AutoSync.WIFI_ONLY,
+    val sortOrder: SortOrder = SortOrder.UPDATED,
+    val proxy: ProxyPreference = ProxyPreference(),
+    val cleanUpInterval: Duration = 12.hours,
+    val lastCleanup: Instant? = null,
+    val favouriteApps: Set<String> = emptySet(),
+    val homeScreenSwiping: Boolean = true,
+)
+
+@OptIn(ExperimentalSerializationApi::class)
+object SettingsSerializer : Serializer<Settings> {
+
+    private val json = Json { encodeDefaults = true }
+
+    override val defaultValue: Settings = Settings()
+
+    override suspend fun readFrom(input: InputStream): Settings {
+        return try {
+            json.decodeFromStream(input)
+        } catch (e: SerializationException) {
+            e.printStackTrace()
+            defaultValue
+        }
+    }
+
+    override suspend fun writeTo(t: Settings, output: OutputStream) {
+        try {
+            json.encodeToStream(t, output)
+        } catch (e: SerializationException) {
+            e.printStackTrace()
+        } catch (e: IOException) {
+            e.printStackTrace()
+        }
+    }
+}

app/src/main/kotlin/com/looker/droidify/datastore/SettingsRepository.kt

@@ -0,0 +1,63 @@
+package com.looker.droidify.datastore
+
+import android.net.Uri
+import com.looker.droidify.datastore.model.AutoSync
+import com.looker.droidify.datastore.model.InstallerType
+import com.looker.droidify.datastore.model.ProxyType
+import com.looker.droidify.datastore.model.SortOrder
+import com.looker.droidify.datastore.model.Theme
+import kotlinx.coroutines.flow.Flow
+import kotlinx.coroutines.flow.distinctUntilChanged
+import kotlinx.coroutines.flow.map
+import kotlin.time.Duration
+
+interface SettingsRepository {
+
+    val data: Flow<Settings>
+
+    suspend fun getInitial(): Settings
+
+    suspend fun export(target: Uri)
+
+    suspend fun import(target: Uri)
+
+    suspend fun setLanguage(language: String)
+
+    suspend fun enableIncompatibleVersion(enable: Boolean)
+
+    suspend fun enableNotifyUpdates(enable: Boolean)
+
+    suspend fun enableUnstableUpdates(enable: Boolean)
+
+    suspend fun setIgnoreSignature(enable: Boolean)
+
+    suspend fun setTheme(theme: Theme)
+
+    suspend fun setDynamicTheme(enable: Boolean)
+
+    suspend fun setInstallerType(installerType: InstallerType)
+
+    suspend fun setAutoUpdate(allow: Boolean)
+
+    suspend fun setAutoSync(autoSync: AutoSync)
+
+    suspend fun setSortOrder(sortOrder: SortOrder)
+
+    suspend fun setProxyType(proxyType: ProxyType)
+
+    suspend fun setProxyHost(proxyHost: String)
+
+    suspend fun setProxyPort(proxyPort: Int)
+
+    suspend fun setCleanUpInterval(interval: Duration)
+
+    suspend fun setCleanupInstant()
+
+    suspend fun setHomeScreenSwiping(value: Boolean)
+
+    suspend fun toggleFavourites(packageName: String)
+}
+
+inline fun <T> SettingsRepository.get(crossinline block: suspend Settings.() -> T): Flow<T> {
+    return data.map(block).distinctUntilChanged()
+}

app/src/main/kotlin/com/looker/droidify/datastore/exporter/SettingsExporter.kt

@@ -0,0 +1,57 @@
+package com.looker.droidify.datastore.exporter
+
+import android.content.Context
+import android.net.Uri
+import com.looker.droidify.utility.common.Exporter
+import com.looker.droidify.datastore.Settings
+import kotlinx.coroutines.CoroutineDispatcher
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.cancel
+import kotlinx.coroutines.launch
+import kotlinx.coroutines.withContext
+import kotlinx.serialization.ExperimentalSerializationApi
+import kotlinx.serialization.SerializationException
+import kotlinx.serialization.json.Json
+import kotlinx.serialization.json.decodeFromStream
+import kotlinx.serialization.json.encodeToStream
+import java.io.IOException
+
+@OptIn(ExperimentalSerializationApi::class)
+class SettingsExporter(
+    private val context: Context,
+    private val scope: CoroutineScope,
+    private val ioDispatcher: CoroutineDispatcher,
+    private val json: Json
+) : Exporter<Settings> {
+
+    override suspend fun export(item: Settings, target: Uri) {
+        scope.launch(ioDispatcher) {
+            try {
+                context.contentResolver.openOutputStream(target).use {
+                    if (it != null) json.encodeToStream(item, it)
+                }
+            } catch (e: SerializationException) {
+                e.printStackTrace()
+                cancel()
+            } catch (e: IOException) {
+                e.printStackTrace()
+                cancel()
+            }
+        }
+    }
+
+    override suspend fun import(target: Uri): Settings = withContext(ioDispatcher) {
+        try {
+            context.contentResolver.openInputStream(target).use {
+                checkNotNull(it) { "Null input stream for import file" }
+                json.decodeFromStream(it)
+            }
+        } catch (e: SerializationException) {
+            e.printStackTrace()
+            throw IllegalStateException(e.message)
+        } catch (e: IOException) {
+            e.printStackTrace()
+            throw IllegalStateException(e.message)
+        }
+    }
+}

app/src/main/kotlin/com/looker/droidify/datastore/extension/Preferences.kt

@@ -0,0 +1,123 @@
+package com.looker.droidify.datastore.extension
+
+import android.content.Context
+import android.content.res.Configuration
+import com.looker.droidify.R
+import com.looker.droidify.R.string as stringRes
+import com.looker.droidify.R.style as styleRes
+import com.looker.droidify.utility.common.SdkCheck
+import com.looker.droidify.datastore.model.AutoSync
+import com.looker.droidify.datastore.model.InstallerType
+import com.looker.droidify.datastore.model.ProxyType
+import com.looker.droidify.datastore.model.SortOrder
+import com.looker.droidify.datastore.model.Theme
+import kotlin.time.Duration
+
+fun Configuration.getThemeRes(theme: Theme, dynamicTheme: Boolean) = when (theme) {
+    Theme.SYSTEM -> {
+        if ((uiMode and Configuration.UI_MODE_NIGHT_YES) != 0) {
+            if (SdkCheck.isSnowCake && dynamicTheme) {
+                styleRes.Theme_Main_DynamicDark
+            } else {
+                styleRes.Theme_Main_Dark
+            }
+        } else {
+            if (SdkCheck.isSnowCake && dynamicTheme) {
+                styleRes.Theme_Main_DynamicLight
+            } else {
+                styleRes.Theme_Main_Light
+            }
+        }
+    }
+
+    Theme.SYSTEM_BLACK -> {
+        if ((uiMode and Configuration.UI_MODE_NIGHT_YES) != 0) {
+            if (SdkCheck.isSnowCake && dynamicTheme) {
+                styleRes.Theme_Main_DynamicAmoled
+            } else {
+                styleRes.Theme_Main_Amoled
+            }
+        } else {
+            if (SdkCheck.isSnowCake && dynamicTheme) {
+                styleRes.Theme_Main_DynamicLight
+            } else {
+                styleRes.Theme_Main_Light
+            }
+        }
+    }
+
+    Theme.LIGHT -> if (SdkCheck.isSnowCake && dynamicTheme) {
+        styleRes.Theme_Main_DynamicLight
+    } else {
+        styleRes.Theme_Main_Light
+    }
+    Theme.DARK -> if (SdkCheck.isSnowCake && dynamicTheme) {
+        styleRes.Theme_Main_DynamicDark
+    } else {
+        styleRes.Theme_Main_Dark
+    }
+    Theme.AMOLED -> if (SdkCheck.isSnowCake && dynamicTheme) {
+        styleRes.Theme_Main_DynamicAmoled
+    } else {
+        styleRes.Theme_Main_Amoled
+    }
+}
+
+fun Context?.toTime(duration: Duration): String {
+    val time = duration.inWholeHours.toInt()
+    val days = duration.inWholeDays.toInt()
+    if (duration == Duration.INFINITE) return this?.getString(stringRes.never) ?: ""
+    return if (time >= 24) {
+        "$days " + this?.resources?.getQuantityString(
+            R.plurals.days,
+            days
+        )
+    } else {
+        "$time " + this?.resources?.getQuantityString(R.plurals.hours, time)
+    }
+}
+
+fun Context?.themeName(theme: Theme) = this?.let {
+    when (theme) {
+        Theme.SYSTEM -> getString(stringRes.system)
+        Theme.SYSTEM_BLACK -> getString(stringRes.system) + " " + getString(stringRes.amoled)
+        Theme.LIGHT -> getString(stringRes.light)
+        Theme.DARK -> getString(stringRes.dark)
+        Theme.AMOLED -> getString(stringRes.amoled)
+    }
+} ?: ""
+
+fun Context?.sortOrderName(sortOrder: SortOrder) = this?.let {
+    when (sortOrder) {
+        SortOrder.UPDATED -> getString(stringRes.recently_updated)
+        SortOrder.ADDED -> getString(stringRes.whats_new)
+        SortOrder.NAME -> getString(stringRes.name)
+// 		SortOrder.SIZE -> getString(stringRes.size)
+    }
+} ?: ""
+
+fun Context?.autoSyncName(autoSync: AutoSync) = this?.let {
+    when (autoSync) {
+        AutoSync.NEVER -> getString(stringRes.never)
+        AutoSync.WIFI_ONLY -> getString(stringRes.only_on_wifi)
+        AutoSync.WIFI_PLUGGED_IN -> getString(stringRes.only_on_wifi_with_charging)
+        AutoSync.ALWAYS -> getString(stringRes.always)
+    }
+} ?: ""
+
+fun Context?.proxyName(proxyType: ProxyType) = this?.let {
+    when (proxyType) {
+        ProxyType.DIRECT -> getString(stringRes.no_proxy)
+        ProxyType.HTTP -> getString(stringRes.http_proxy)
+        ProxyType.SOCKS -> getString(stringRes.socks_proxy)
+    }
+} ?: ""
+
+fun Context?.installerName(installerType: InstallerType) = this?.let {
+    when (installerType) {
+        InstallerType.LEGACY -> getString(stringRes.legacy_installer)
+        InstallerType.SESSION -> getString(stringRes.session_installer)
+        InstallerType.SHIZUKU -> getString(stringRes.shizuku_installer)
+        InstallerType.ROOT -> getString(stringRes.root_installer)
+    }
+} ?: ""

app/src/main/kotlin/com/looker/droidify/datastore/migration/ProtoToPreferenceMigration.kt

@@ -0,0 +1,23 @@
+package com.looker.droidify.datastore.migration
+
+import com.looker.droidify.datastore.PreferenceSettingsRepository.PreferencesKeys.setting
+import com.looker.droidify.datastore.Settings
+import kotlinx.coroutines.flow.first
+
+class ProtoToPreferenceMigration(
+    private val oldDataStore: androidx.datastore.core.DataStore<Settings>
+) : androidx.datastore.core.DataMigration<androidx.datastore.preferences.core.Preferences> {
+    override suspend fun cleanUp() {
+    }
+
+    override suspend fun shouldMigrate(currentData: androidx.datastore.preferences.core.Preferences): Boolean {
+        return currentData.asMap().isEmpty()
+    }
+
+    override suspend fun migrate(currentData: androidx.datastore.preferences.core.Preferences): androidx.datastore.preferences.core.Preferences {
+        val settings = oldDataStore.data.first()
+        val preferences = currentData.toMutablePreferences()
+        preferences.setting(settings)
+        return preferences
+    }
+}

app/src/main/kotlin/com/looker/droidify/datastore/model/AutoSync.kt

@@ -0,0 +1,8 @@
+package com.looker.droidify.datastore.model
+
+enum class AutoSync {
+    ALWAYS,
+    WIFI_ONLY,
+    WIFI_PLUGGED_IN,
+    NEVER
+}

app/src/main/kotlin/com/looker/droidify/datastore/model/InstallerType.kt

@@ -0,0 +1,19 @@
+package com.looker.droidify.datastore.model
+
+import com.looker.droidify.utility.common.device.Miui
+
+enum class InstallerType {
+    LEGACY,
+    SESSION,
+    SHIZUKU,
+    ROOT;
+
+    companion object {
+        val Default: InstallerType
+            get() = if (Miui.isMiui) {
+                if (Miui.isMiuiOptimizationDisabled()) SESSION else LEGACY
+            } else {
+                SESSION
+            }
+    }
+}

app/src/main/kotlin/com/looker/droidify/datastore/model/ProxyPreference.kt

@@ -0,0 +1,20 @@
+package com.looker.droidify.datastore.model
+
+import kotlinx.serialization.Serializable
+
+@Serializable
+data class ProxyPreference(
+    val type: ProxyType = ProxyType.DIRECT,
+    val host: String = "localhost",
+    val port: Int = 9050
+) {
+    fun update(
+        newType: ProxyType? = null,
+        newHost: String? = null,
+        newPort: Int? = null
+    ): ProxyPreference = copy(
+        type = newType ?: type,
+        host = newHost ?: host,
+        port = newPort ?: port
+    )
+}

app/src/main/kotlin/com/looker/droidify/datastore/model/ProxyType.kt

@@ -0,0 +1,7 @@
+package com.looker.droidify.datastore.model
+
+enum class ProxyType {
+    DIRECT,
+    HTTP,
+    SOCKS
+}

app/src/main/kotlin/com/looker/droidify/datastore/model/SortOrder.kt

@@ -0,0 +1,8 @@
+package com.looker.droidify.datastore.model
+
+// todo: Add Support for sorting by size
+enum class SortOrder {
+    UPDATED,
+    ADDED,
+    NAME
+}

app/src/main/kotlin/com/looker/droidify/datastore/model/Theme.kt

@@ -0,0 +1,9 @@
+package com.looker.droidify.datastore.model
+
+enum class Theme {
+    SYSTEM,
+    SYSTEM_BLACK,
+    LIGHT,
+    DARK,
+    AMOLED
+}

app/src/main/kotlin/com/looker/droidify/di/CoroutinesModule.kt

@@ -0,0 +1,44 @@
+package com.looker.droidify.di
+
+import dagger.Module
+import dagger.Provides
+import dagger.hilt.InstallIn
+import dagger.hilt.components.SingletonComponent
+import kotlinx.coroutines.CoroutineDispatcher
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.SupervisorJob
+import javax.inject.Qualifier
+import javax.inject.Singleton
+
+@Retention(AnnotationRetention.RUNTIME)
+@Qualifier
+annotation class IoDispatcher
+
+@Retention(AnnotationRetention.RUNTIME)
+@Qualifier
+annotation class DefaultDispatcher
+
+@Retention(AnnotationRetention.RUNTIME)
+@Qualifier
+annotation class ApplicationScope
+
+@Module
+@InstallIn(SingletonComponent::class)
+object CoroutinesModule {
+
+    @Provides
+    @IoDispatcher
+    fun providesIODispatcher(): CoroutineDispatcher = Dispatchers.IO
+
+    @Provides
+    @DefaultDispatcher
+    fun providesDefaultDispatcher(): CoroutineDispatcher = Dispatchers.Default
+
+    @Provides
+    @Singleton
+    @ApplicationScope
+    fun providesCoroutineScope(
+        @DefaultDispatcher dispatcher: CoroutineDispatcher
+    ): CoroutineScope = CoroutineScope(SupervisorJob() + dispatcher)
+}

app/src/main/kotlin/com/looker/droidify/di/DatastoreModule.kt

@@ -0,0 +1,80 @@
+package com.looker.droidify.di
+
+import android.content.Context
+import androidx.datastore.core.DataStore
+import androidx.datastore.core.DataStoreFactory
+import androidx.datastore.dataStoreFile
+import androidx.datastore.preferences.core.PreferenceDataStoreFactory
+import androidx.datastore.preferences.core.Preferences
+import androidx.datastore.preferences.preferencesDataStoreFile
+import com.looker.droidify.utility.common.Exporter
+import com.looker.droidify.datastore.PreferenceSettingsRepository
+import com.looker.droidify.datastore.Settings
+import com.looker.droidify.datastore.SettingsRepository
+import com.looker.droidify.datastore.SettingsSerializer
+import com.looker.droidify.datastore.exporter.SettingsExporter
+import com.looker.droidify.datastore.migration.ProtoToPreferenceMigration
+import dagger.Module
+import dagger.Provides
+import dagger.hilt.InstallIn
+import dagger.hilt.android.qualifiers.ApplicationContext
+import dagger.hilt.components.SingletonComponent
+import kotlinx.coroutines.CoroutineDispatcher
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.serialization.json.Json
+import javax.inject.Singleton
+
+private const val PREFERENCES = "settings_file"
+
+private const val SETTINGS = "settings"
+
+@Module
+@InstallIn(SingletonComponent::class)
+object DatastoreModule {
+
+    @Singleton
+    @Provides
+    fun provideProtoDatastore(
+        @ApplicationContext context: Context,
+    ): DataStore<Settings> = DataStoreFactory.create(
+        serializer = SettingsSerializer,
+    ) {
+        context.dataStoreFile(PREFERENCES)
+    }
+
+    @Singleton
+    @Provides
+    fun providePreferenceDatastore(
+        @ApplicationContext context: Context,
+        oldDatastore: DataStore<Settings>,
+    ): DataStore<Preferences> = PreferenceDataStoreFactory.create(
+        migrations = listOf(
+            ProtoToPreferenceMigration(oldDatastore)
+        )
+    ) {
+        context.preferencesDataStoreFile(SETTINGS)
+    }
+
+    @Singleton
+    @Provides
+    fun provideSettingsExporter(
+        @ApplicationContext context: Context,
+        @ApplicationScope scope: CoroutineScope,
+        @IoDispatcher dispatcher: CoroutineDispatcher
+    ): Exporter<Settings> = SettingsExporter(
+        context = context,
+        scope = scope,
+        ioDispatcher = dispatcher,
+        json = Json {
+            encodeDefaults = true
+            prettyPrint = true
+        }
+    )
+
+    @Singleton
+    @Provides
+    fun provideSettingsRepository(
+        dataStore: DataStore<Preferences>,
+        exporter: Exporter<Settings>
+    ): SettingsRepository = PreferenceSettingsRepository(dataStore, exporter)
+}

app/src/main/kotlin/com/looker/droidify/di/InstallModule.kt

@@ -0,0 +1,23 @@
+package com.looker.droidify.di
+
+import android.content.Context
+import com.looker.droidify.datastore.SettingsRepository
+import com.looker.droidify.installer.InstallManager
+import dagger.Module
+import dagger.Provides
+import dagger.hilt.InstallIn
+import dagger.hilt.android.qualifiers.ApplicationContext
+import dagger.hilt.components.SingletonComponent
+import javax.inject.Singleton
+
+@Module
+@InstallIn(SingletonComponent::class)
+object InstallModule {
+
+    @Singleton
+    @Provides
+    fun providesInstaller(
+        @ApplicationContext context: Context,
+        settingsRepository: SettingsRepository
+    ): InstallManager = InstallManager(context, settingsRepository)
+}

app/src/main/kotlin/com/looker/droidify/di/NetworkModule.kt

@@ -0,0 +1,27 @@
+package com.looker.droidify.di
+
+import com.looker.droidify.network.Downloader
+import com.looker.droidify.network.KtorDownloader
+import dagger.Module
+import dagger.Provides
+import dagger.hilt.InstallIn
+import dagger.hilt.components.SingletonComponent
+import io.ktor.client.engine.okhttp.OkHttp
+import kotlinx.coroutines.CoroutineDispatcher
+import javax.inject.Singleton
+
+@Module
+@InstallIn(SingletonComponent::class)
+object NetworkModule {
+
+    @Singleton
+    @Provides
+    fun provideDownloader(
+        @IoDispatcher
+        dispatcher: CoroutineDispatcher
+    ): Downloader = KtorDownloader(
+        httpClientEngine = OkHttp.create(),
+        dispatcher = dispatcher,
+    )
+
+}

app/src/main/kotlin/com/looker/droidify/domain/AppRepository.kt

@@ -0,0 +1,25 @@
+package com.looker.droidify.domain
+
+import com.looker.droidify.domain.model.App
+import com.looker.droidify.domain.model.AppMinimal
+import com.looker.droidify.domain.model.Author
+import com.looker.droidify.domain.model.Package
+import com.looker.droidify.domain.model.PackageName
+import kotlinx.coroutines.flow.Flow
+
+interface AppRepository {
+
+    fun getApps(): Flow<List<AppMinimal>>
+
+    fun getApp(packageName: PackageName): Flow<List<App>>
+
+    fun getAppFromAuthor(author: Author): Flow<List<App>>
+
+    fun getPackages(packageName: PackageName): Flow<List<Package>>
+
+    /**
+     * returns true is the app is added successfully
+     * returns false if the app was already in the favourites and so it is removed
+     */
+    suspend fun addToFavourite(packageName: PackageName): Boolean
+}

app/src/main/kotlin/com/looker/droidify/domain/RepoRepository.kt

@@ -0,0 +1,19 @@
+package com.looker.droidify.domain
+
+import com.looker.droidify.domain.model.Repo
+import kotlinx.coroutines.flow.Flow
+
+interface RepoRepository {
+
+    suspend fun getRepo(id: Long): Repo?
+
+    fun getRepos(): Flow<List<Repo>>
+
+    suspend fun updateRepo(repo: Repo)
+
+    suspend fun enableRepository(repo: Repo, enable: Boolean)
+
+    suspend fun sync(repo: Repo): Boolean
+
+    suspend fun syncAll(): Boolean
+}

app/src/main/kotlin/com/looker/droidify/domain/model/App.kt

@@ -0,0 +1,83 @@
+package com.looker.droidify.domain.model
+
+data class App(
+    val repoId: Long,
+    val appId: Long,
+    val categories: List<String>,
+    val links: Links,
+    val metadata: Metadata,
+    val author: Author,
+    val screenshots: Screenshots,
+    val graphics: Graphics,
+    val donation: Donation,
+    val preferredSigner: String = "",
+    val packages: List<Package>
+)
+
+data class Author(
+    val id: Long,
+    val name: String,
+    val email: String,
+    val web: String
+)
+
+data class Donation(
+    val regularUrl: String? = null,
+    val bitcoinAddress: String? = null,
+    val flattrId: String? = null,
+    val liteCoinAddress: String? = null,
+    val openCollectiveId: String? = null,
+    val librePayId: String? = null,
+)
+
+data class Graphics(
+    val featureGraphic: String = "",
+    val promoGraphic: String = "",
+    val tvBanner: String = "",
+    val video: String = ""
+)
+
+data class Links(
+    val changelog: String = "",
+    val issueTracker: String = "",
+    val sourceCode: String = "",
+    val translation: String = "",
+    val webSite: String = ""
+)
+
+data class Metadata(
+    val name: String,
+    val packageName: PackageName,
+    val added: Long,
+    val description: String,
+    val icon: String,
+    val lastUpdated: Long,
+    val license: String,
+    val suggestedVersionCode: Long,
+    val suggestedVersionName: String,
+    val summary: String
+)
+
+data class Screenshots(
+    val phone: List<String> = emptyList(),
+    val sevenInch: List<String> = emptyList(),
+    val tenInch: List<String> = emptyList(),
+    val tv: List<String> = emptyList(),
+    val wear: List<String> = emptyList()
+)
+
+data class AppMinimal(
+    val appId: Long,
+    val name: String,
+    val summary: String,
+    val icon: String,
+    val suggestedVersion: String,
+)
+
+fun App.minimal() = AppMinimal(
+    appId = appId,
+    name = metadata.name,
+    summary = metadata.summary,
+    icon = metadata.icon,
+    suggestedVersion = metadata.suggestedVersionName,
+)

app/src/main/kotlin/com/looker/droidify/domain/model/DataFile.kt

@@ -0,0 +1,7 @@
+package com.looker.droidify.domain.model
+
+interface DataFile {
+    val name: String
+    val hash: String
+    val size: Long
+}

app/src/main/kotlin/com/looker/droidify/domain/model/Fingerprint.kt

@@ -0,0 +1,43 @@
+package com.looker.droidify.domain.model
+
+import java.security.MessageDigest
+import java.security.cert.Certificate
+import java.util.Locale
+
+@JvmInline
+value class Fingerprint(val value: String) {
+    init {
+        require(value.isNotBlank() && value.length == FINGERPRINT_LENGTH) { "Invalid Fingerprint: $value" }
+    }
+
+    override fun toString(): String = value
+}
+
+@Suppress("NOTHING_TO_INLINE")
+inline fun Fingerprint.check(found: Fingerprint): Boolean {
+    return found.value.equals(value, ignoreCase = true)
+}
+
+private const val FINGERPRINT_LENGTH = 64
+
+fun ByteArray.hex(): String = joinToString(separator = "") { byte ->
+    "%02x".format(Locale.US, byte.toInt() and 0xff)
+}
+
+fun Fingerprint.formattedString(): String = value.windowed(2, 2, false)
+    .take(FINGERPRINT_LENGTH / 2).joinToString(separator = " ") { it.uppercase(Locale.US) }
+
+fun Certificate.fingerprint(): Fingerprint {
+    val bytes = encoded
+    return if (bytes.size >= 256) {
+        try {
+            val fingerprint = MessageDigest.getInstance("sha256").digest(bytes)
+            Fingerprint(fingerprint.hex().uppercase())
+        } catch (e: Exception) {
+            e.printStackTrace()
+            Fingerprint("")
+        }
+    } else {
+        Fingerprint("")
+    }
+}

app/src/main/kotlin/com/looker/droidify/domain/model/Package.kt

@@ -0,0 +1,42 @@
+package com.looker.droidify.domain.model
+
+data class Package(
+    val id: Long,
+    val installed: Boolean,
+    val added: Long,
+    val apk: ApkFile,
+    val platforms: Platforms,
+    val features: List<String>,
+    val antiFeatures: List<String>,
+    val manifest: Manifest,
+    val whatsNew: String
+)
+
+data class ApkFile(
+    override val name: String,
+    override val hash: String,
+    override val size: Long
+) : DataFile
+
+data class Manifest(
+    val versionCode: Long,
+    val versionName: String,
+    val usesSDKs: SDKs,
+    val signer: Set<String>,
+    val permissions: List<Permission>
+)
+
+@JvmInline
+value class Platforms(val value: List<String>)
+
+data class SDKs(
+    val min: Int = -1,
+    val max: Int = -1,
+    val target: Int = -1
+)
+
+// means the max sdk here and any sdk value as -1 means not valid
+data class Permission(
+    val name: String,
+    val sdKs: SDKs
+)

app/src/main/kotlin/com/looker/droidify/domain/model/PackageName.kt

@@ -0,0 +1,6 @@
+package com.looker.droidify.domain.model
+
+@JvmInline
+value class PackageName(val name: String)
+
+fun String.toPackageName() = PackageName(this)

app/src/main/kotlin/com/looker/droidify/domain/model/Repo.kt

@@ -0,0 +1,49 @@
+package com.looker.droidify.domain.model
+
+data class Repo(
+    val id: Long,
+    val enabled: Boolean,
+    val address: String,
+    val name: String,
+    val description: String,
+    val fingerprint: Fingerprint?,
+    val authentication: Authentication,
+    val versionInfo: VersionInfo,
+    val mirrors: List<String>,
+    val antiFeatures: List<AntiFeature>,
+    val categories: List<Category>
+) {
+    val shouldAuthenticate =
+        authentication.username.isNotEmpty() && authentication.password.isNotEmpty()
+
+    fun update(fingerprint: Fingerprint, timestamp: Long? = null, etag: String? = null): Repo {
+        return copy(
+            fingerprint = fingerprint,
+            versionInfo = timestamp?.let { VersionInfo(timestamp = it, etag = etag) } ?: versionInfo
+        )
+    }
+}
+
+data class AntiFeature(
+    val id: Long,
+    val name: String,
+    val icon: String = "",
+    val description: String = ""
+)
+
+data class Category(
+    val id: Long,
+    val name: String,
+    val icon: String = "",
+    val description: String = ""
+)
+
+data class Authentication(
+    val username: String,
+    val password: String
+)
+
+data class VersionInfo(
+    val timestamp: Long,
+    val etag: String?
+)

app/src/main/kotlin/com/looker/droidify/graphics/DrawableWrapper.kt

@@ -0,0 +1,56 @@
+package com.looker.droidify.graphics
+
+import android.graphics.Canvas
+import android.graphics.ColorFilter
+import android.graphics.Rect
+import android.graphics.drawable.Drawable
+
+open class DrawableWrapper(val drawable: Drawable) : Drawable() {
+    init {
+        drawable.callback = object : Callback {
+            override fun invalidateDrawable(who: Drawable) {
+                callback?.invalidateDrawable(who)
+            }
+
+            override fun scheduleDrawable(who: Drawable, what: Runnable, `when`: Long) {
+                callback?.scheduleDrawable(who, what, `when`)
+            }
+
+            override fun unscheduleDrawable(who: Drawable, what: Runnable) {
+                callback?.unscheduleDrawable(who, what)
+            }
+        }
+    }
+
+    override fun onBoundsChange(bounds: Rect) {
+        drawable.bounds = bounds
+    }
+
+    override fun getIntrinsicWidth(): Int = drawable.intrinsicWidth
+    override fun getIntrinsicHeight(): Int = drawable.intrinsicHeight
+    override fun getMinimumWidth(): Int = drawable.minimumWidth
+    override fun getMinimumHeight(): Int = drawable.minimumHeight
+
+    override fun draw(canvas: Canvas) {
+        drawable.draw(canvas)
+    }
+
+    override fun getAlpha(): Int {
+        return drawable.alpha
+    }
+
+    override fun setAlpha(alpha: Int) {
+        drawable.alpha = alpha
+    }
+
+    override fun getColorFilter(): ColorFilter? {
+        return drawable.colorFilter
+    }
+
+    override fun setColorFilter(colorFilter: ColorFilter?) {
+        drawable.colorFilter = colorFilter
+    }
+
+    @Suppress("DEPRECATION")
+    override fun getOpacity(): Int = drawable.opacity
+}

app/src/main/kotlin/com/looker/droidify/graphics/PaddingDrawable.kt

@@ -0,0 +1,30 @@
+package com.looker.droidify.graphics
+
+import android.graphics.Rect
+import android.graphics.drawable.Drawable
+import kotlin.math.roundToInt
+
+class PaddingDrawable(
+    drawable: Drawable,
+    private val horizontalFactor: Float,
+    private val aspectRatio: Float = 16f / 9f
+) : DrawableWrapper(drawable) {
+    override fun getIntrinsicWidth(): Int =
+        (horizontalFactor * super.getIntrinsicWidth()).roundToInt()
+
+    override fun getIntrinsicHeight(): Int =
+        ((horizontalFactor * aspectRatio) * super.getIntrinsicHeight()).roundToInt()
+
+    override fun onBoundsChange(bounds: Rect) {
+        val width = (bounds.width() / horizontalFactor).roundToInt()
+        val height = (bounds.height() / (horizontalFactor * aspectRatio)).roundToInt()
+        val left = (bounds.width() - width) / 2
+        val top = (bounds.height() - height) / 2
+        drawable.setBounds(
+            bounds.left + left,
+            bounds.top + top,
+            bounds.left + left + width,
+            bounds.top + top + height
+        )
+    }
+}

app/src/main/kotlin/com/looker/droidify/index/IndexMerger.kt

@@ -0,0 +1,118 @@
+package com.looker.droidify.index
+
+import android.content.ContentValues
+import android.database.sqlite.SQLiteDatabase
+import com.fasterxml.jackson.core.JsonToken
+import com.looker.droidify.utility.common.extension.Json
+import com.looker.droidify.utility.common.extension.asSequence
+import com.looker.droidify.utility.common.extension.collectNotNull
+import com.looker.droidify.utility.common.extension.writeDictionary
+import com.looker.droidify.model.Product
+import com.looker.droidify.model.Release
+import com.looker.droidify.utility.serialization.product
+import com.looker.droidify.utility.serialization.release
+import com.looker.droidify.utility.serialization.serialize
+import java.io.ByteArrayOutputStream
+import java.io.Closeable
+import java.io.File
+
+class IndexMerger(file: File) : Closeable {
+    private val db = SQLiteDatabase.openOrCreateDatabase(file, null)
+
+    init {
+        db.execWithResult("PRAGMA synchronous = OFF")
+        db.execWithResult("PRAGMA journal_mode = OFF")
+        db.execSQL(
+            "CREATE TABLE product (" +
+                "package_name TEXT PRIMARY KEY," +
+                "description TEXT NOT NULL, " +
+                "data BLOB NOT NULL)"
+        )
+        db.execSQL("CREATE TABLE releases (package_name TEXT PRIMARY KEY, data BLOB NOT NULL)")
+        db.beginTransaction()
+    }
+
+    fun addProducts(products: List<Product>) {
+        for (product in products) {
+            val outputStream = ByteArrayOutputStream()
+            Json.factory.createGenerator(outputStream)
+                .use { it.writeDictionary(product::serialize) }
+            db.insert(
+                "product",
+                null,
+                ContentValues().apply {
+                    put("package_name", product.packageName)
+                    put("description", product.description)
+                    put("data", outputStream.toByteArray())
+                }
+            )
+        }
+    }
+
+    fun addReleases(pairs: List<Pair<String, List<Release>>>) {
+        for (pair in pairs) {
+            val (packageName, releases) = pair
+            val outputStream = ByteArrayOutputStream()
+            Json.factory.createGenerator(outputStream).use {
+                it.writeStartArray()
+                for (release in releases) {
+                    it.writeDictionary(release::serialize)
+                }
+                it.writeEndArray()
+            }
+            db.insert(
+                "releases",
+                null,
+                ContentValues().apply {
+                    put("package_name", packageName)
+                    put("data", outputStream.toByteArray())
+                }
+            )
+        }
+    }
+
+    private fun closeTransaction() {
+        if (db.inTransaction()) {
+            db.setTransactionSuccessful()
+            db.endTransaction()
+        }
+    }
+
+    fun forEach(repositoryId: Long, windowSize: Int, callback: (List<Product>, Int) -> Unit) {
+        closeTransaction()
+        db.rawQuery(
+            """SELECT product.description, product.data AS pd, releases.data AS rd FROM product
+          LEFT JOIN releases ON product.package_name = releases.package_name""",
+            null
+        ).use { cursor ->
+            cursor.asSequence().map { currentCursor ->
+                val description = currentCursor.getString(0)
+                val product = Json.factory.createParser(currentCursor.getBlob(1)).use {
+                    it.nextToken()
+                    it.product().apply {
+                        this.repositoryId = repositoryId
+                        this.description = description
+                    }
+                }
+                val releases = currentCursor.getBlob(2)?.let { bytes ->
+                    Json.factory.createParser(bytes).use {
+                        it.nextToken()
+                        it.collectNotNull(
+                            JsonToken.START_OBJECT
+                        ) { release() }
+                    }
+                }.orEmpty()
+                product.copy(releases = releases)
+            }.windowed(windowSize, windowSize, true)
+                .forEach { products -> callback(products, cursor.count) }
+        }
+    }
+
+    override fun close() {
+        db.use { closeTransaction() }
+    }
+
+    private inline fun SQLiteDatabase.execWithResult(sql: String) {
+        rawQuery(sql, null).use { it.count }
+    }
+}

app/src/main/kotlin/com/looker/droidify/index/IndexV1Parser.kt

@@ -0,0 +1,559 @@
+package com.looker.droidify.index
+
+import android.content.res.Resources
+import androidx.core.os.ConfigurationCompat.getLocales
+import androidx.core.os.LocaleListCompat
+import com.fasterxml.jackson.core.JsonParser
+import com.fasterxml.jackson.core.JsonToken
+import com.looker.droidify.utility.common.extension.Json
+import com.looker.droidify.utility.common.extension.collectDistinctNotEmptyStrings
+import com.looker.droidify.utility.common.extension.collectNotNull
+import com.looker.droidify.utility.common.extension.forEach
+import com.looker.droidify.utility.common.extension.forEachKey
+import com.looker.droidify.utility.common.extension.illegal
+import com.looker.droidify.model.Product
+import com.looker.droidify.model.Product.Donate.Bitcoin
+import com.looker.droidify.model.Product.Donate.Liberapay
+import com.looker.droidify.model.Product.Donate.Litecoin
+import com.looker.droidify.model.Product.Donate.OpenCollective
+import com.looker.droidify.model.Product.Donate.Regular
+import com.looker.droidify.model.Product.Screenshot.Type.LARGE_TABLET
+import com.looker.droidify.model.Product.Screenshot.Type.PHONE
+import com.looker.droidify.model.Product.Screenshot.Type.SMALL_TABLET
+import com.looker.droidify.model.Product.Screenshot.Type.TV
+import com.looker.droidify.model.Product.Screenshot.Type.VIDEO
+import com.looker.droidify.model.Product.Screenshot.Type.WEAR
+import com.looker.droidify.model.Release
+import com.looker.droidify.utility.common.SdkCheck
+import com.looker.droidify.utility.common.nullIfEmpty
+import java.io.InputStream
+
+object IndexV1Parser {
+    interface Callback {
+        fun onRepository(
+            mirrors: List<String>,
+            name: String,
+            description: String,
+            version: Int,
+            timestamp: Long
+        )
+
+        fun onProduct(product: Product)
+        fun onReleases(packageName: String, releases: List<Release>)
+    }
+
+    private class Screenshots(
+        val video: List<String>,
+        val phone: List<String>,
+        val smallTablet: List<String>,
+        val largeTablet: List<String>,
+        val wear: List<String>,
+        val tv: List<String>,
+    )
+
+    private class Localized(
+        val name: String,
+        val summary: String,
+        val description: String,
+        val whatsNew: String,
+        val metadataIcon: String,
+        val screenshots: Screenshots?
+    )
+
+    private fun <T> Map<String, Localized>.getAndCall(
+        key: String,
+        callback: (String, Localized) -> T?
+    ): T? {
+        return this[key]?.let { callback(key, it) }
+    }
+
+    /**
+     * Gets the best localization for the given [localeList]
+     * from collections.
+     */
+    private fun <T> Map<String, T>?.getBestLocale(localeList: LocaleListCompat): T? {
+        if (isNullOrEmpty()) return null
+        val firstMatch = localeList.getFirstMatch(keys.toTypedArray()) ?: return null
+        val tag = firstMatch.toLanguageTag()
+        // try first matched tag first (usually has region tag, e.g. de-DE)
+        return get(tag) ?: run {
+            // split away stuff like script and try language and region only
+            val langCountryTag = "${firstMatch.language}-${firstMatch.country}"
+            getOrStartsWith(langCountryTag) ?: run {
+                // split away region tag and try language only
+                val langTag = firstMatch.language
+                // try language, then English and then just take the first of the list
+                getOrStartsWith(langTag) ?: get("en-US") ?: get("en") ?: values.first()
+            }
+        }
+    }
+
+    /**
+     * Returns the value from the map with the given key or if that key is not contained in the map,
+     * tries the first map key that starts with the given key.
+     * If nothing matches, null is returned.
+     *
+     * This is useful when looking for a language tag like `fr_CH` and falling back to `fr`
+     * in a map that has `fr_FR` as a key.
+     */
+    private fun <T> Map<String, T>.getOrStartsWith(s: String): T? = get(s) ?: run {
+        entries.forEach { (key, value) ->
+            if (key.startsWith(s)) return value
+        }
+        return null
+    }
+
+    private fun <T> Map<String, Localized>.find(callback: (String, Localized) -> T?): T? {
+        return getAndCall("en-US", callback)
+            ?: getAndCall("en_US", callback)
+            ?: getAndCall("en", callback)
+    }
+
+    private fun <T> Map<String, Localized>.findLocalized(callback: (Localized) -> T?): T? {
+        return getBestLocale(getLocales(Resources.getSystem().configuration))?.let { callback(it) }
+    }
+
+    private fun Map<String, Localized>.findString(
+        fallback: String,
+        callback: (Localized) -> String
+    ): String {
+        return (find { _, localized -> callback(localized).nullIfEmpty() } ?: fallback).trim()
+    }
+
+    private fun Map<String, Localized>.findLocalizedString(
+        fallback: String,
+        callback: (Localized) -> String
+    ): String {
+        // @BLumia: it's possible a key of a certain Localized object is empty, so we still need a fallback
+        return (
+            findLocalized { localized -> callback(localized).trim().nullIfEmpty() } ?: findString(
+                fallback,
+                callback
+            )
+            ).trim()
+    }
+
+    internal object DonateComparator : Comparator<Product.Donate> {
+        private val classes = listOf(
+            Regular::class,
+            Bitcoin::class,
+            Litecoin::class,
+            Liberapay::class,
+            OpenCollective::class
+        )
+
+        override fun compare(donate1: Product.Donate, donate2: Product.Donate): Int {
+            val index1 = classes.indexOf(donate1::class)
+            val index2 = classes.indexOf(donate2::class)
+            return when {
+                index1 >= 0 && index2 == -1 -> -1
+                index2 >= 0 && index1 == -1 -> 1
+                else -> index1.compareTo(index2)
+            }
+        }
+    }
+
+    private const val DICT_REPO = "repo"
+    private const val DICT_PRODUCT = "apps"
+    private const val DICT_RELEASE = "packages"
+
+    private const val KEY_REPO_ADDRESS = "address"
+    private const val KEY_REPO_MIRRORS = "mirrors"
+    private const val KEY_REPO_NAME = "name"
+    private const val KEY_REPO_DESC = "description"
+    private const val KEY_REPO_VER = "version"
+    private const val KEY_REPO_TIME = "timestamp"
+
+    fun parse(repositoryId: Long, inputStream: InputStream, callback: Callback) {
+        val jsonParser = Json.factory.createParser(inputStream)
+        if (jsonParser.nextToken() != JsonToken.START_OBJECT) {
+            jsonParser.illegal()
+        } else {
+            jsonParser.forEachKey { key ->
+                when {
+                    key.dictionary(DICT_REPO) -> {
+                        var address = ""
+                        var mirrors = emptyList<String>()
+                        var name = ""
+                        var description = ""
+                        var version = 0
+                        var timestamp = 0L
+                        forEachKey {
+                            when {
+                                it.string(KEY_REPO_ADDRESS) -> address = valueAsString
+                                it.array(KEY_REPO_MIRRORS) -> mirrors =
+                                    collectDistinctNotEmptyStrings()
+
+                                it.string(KEY_REPO_NAME) -> name = valueAsString
+                                it.string(KEY_REPO_DESC) -> description = valueAsString
+                                it.number(KEY_REPO_VER) -> version = valueAsInt
+                                it.number(KEY_REPO_TIME) -> timestamp = valueAsLong
+                                else -> skipChildren()
+                            }
+                        }
+                        val realMirrors = (
+                            if (address.isNotEmpty()) {
+                                listOf(address)
+                            } else {
+                                emptyList()
+                            }
+                            ) + mirrors
+                        callback.onRepository(
+                            mirrors = realMirrors.distinct(),
+                            name = name,
+                            description = description,
+                            version = version,
+                            timestamp = timestamp
+                        )
+                    }
+
+                    key.array(DICT_PRODUCT) -> forEach(JsonToken.START_OBJECT) {
+                        val product = parseProduct(repositoryId)
+                        callback.onProduct(product)
+                    }
+
+                    key.dictionary(DICT_RELEASE) -> forEachKey {
+                        if (it.token == JsonToken.START_ARRAY) {
+                            val packageName = it.key
+                            val releases = collectNotNull(JsonToken.START_OBJECT) { parseRelease() }
+                            callback.onReleases(packageName, releases)
+                        } else {
+                            skipChildren()
+                        }
+                    }
+
+                    else -> skipChildren()
+                }
+            }
+        }
+    }
+
+    private const val KEY_PRODUCT_PACKAGENAME = "packageName"
+    private const val KEY_PRODUCT_NAME = "name"
+    private const val KEY_PRODUCT_SUMMARY = "summary"
+    private const val KEY_PRODUCT_DESCRIPTION = "description"
+    private const val KEY_PRODUCT_ICON = "icon"
+    private const val KEY_PRODUCT_AUTHORNAME = "authorName"
+    private const val KEY_PRODUCT_AUTHOREMAIL = "authorEmail"
+    private const val KEY_PRODUCT_AUTHORWEBSITE = "authorWebSite"
+    private const val KEY_PRODUCT_SOURCECODE = "sourceCode"
+    private const val KEY_PRODUCT_CHANGELOG = "changelog"
+    private const val KEY_PRODUCT_WEBSITE = "webSite"
+    private const val KEY_PRODUCT_ISSUETRACKER = "issueTracker"
+    private const val KEY_PRODUCT_ADDED = "added"
+    private const val KEY_PRODUCT_LASTUPDATED = "lastUpdated"
+    private const val KEY_PRODUCT_SUGGESTEDVERSIONCODE = "suggestedVersionCode"
+    private const val KEY_PRODUCT_CATEGORIES = "categories"
+    private const val KEY_PRODUCT_ANTIFEATURES = "antiFeatures"
+    private const val KEY_PRODUCT_LICENSE = "license"
+    private const val KEY_PRODUCT_DONATE = "donate"
+    private const val KEY_PRODUCT_BITCOIN = "bitcoin"
+    private const val KEY_PRODUCT_LIBERAPAYID = "liberapay"
+    private const val KEY_PRODUCT_LITECOIN = "litecoin"
+    private const val KEY_PRODUCT_OPENCOLLECTIVE = "openCollective"
+    private const val KEY_PRODUCT_LOCALIZED = "localized"
+    private const val KEY_PRODUCT_WHATSNEW = "whatsNew"
+    private const val KEY_PRODUCT_PHONE_SCREENSHOTS = "phoneScreenshots"
+    private const val KEY_PRODUCT_SEVEN_INCH_SCREENSHOTS = "sevenInchScreenshots"
+    private const val KEY_PRODUCT_TEN_INCH_SCREENSHOTS = "tenInchScreenshots"
+    private const val KEY_PRODUCT_WEAR_SCREENSHOTS = "wearScreenshots"
+    private const val KEY_PRODUCT_TV_SCREENSHOTS = "tvScreenshots"
+    private const val KEY_PRODUCT_VIDEO = "video"
+
+    private fun JsonParser.parseProduct(repositoryId: Long): Product {
+        var packageName = ""
+        var nameFallback = ""
+        var summaryFallback = ""
+        var descriptionFallback = ""
+        var icon = ""
+        var authorName = ""
+        var authorEmail = ""
+        var authorWeb = ""
+        var source = ""
+        var changelog = ""
+        var web = ""
+        var tracker = ""
+        var added = 0L
+        var updated = 0L
+        var suggestedVersionCode = 0L
+        var categories = emptyList<String>()
+        var antiFeatures = emptyList<String>()
+        val licenses = mutableListOf<String>()
+        val donates = mutableListOf<Product.Donate>()
+        val localizedMap = mutableMapOf<String, Localized>()
+        forEachKey { key ->
+            when {
+                key.string(KEY_PRODUCT_PACKAGENAME) -> packageName = valueAsString
+                key.string(KEY_PRODUCT_NAME) -> nameFallback = valueAsString
+                key.string(KEY_PRODUCT_SUMMARY) -> summaryFallback = valueAsString
+                key.string(KEY_PRODUCT_DESCRIPTION) -> descriptionFallback = valueAsString
+                key.string(KEY_PRODUCT_ICON) -> icon = validateIcon(valueAsString)
+                key.string(KEY_PRODUCT_AUTHORNAME) -> authorName = valueAsString
+                key.string(KEY_PRODUCT_AUTHOREMAIL) -> authorEmail = valueAsString
+                key.string(KEY_PRODUCT_AUTHORWEBSITE) -> authorWeb = valueAsString
+                key.string(KEY_PRODUCT_SOURCECODE) -> source = valueAsString
+                key.string(KEY_PRODUCT_CHANGELOG) -> changelog = valueAsString
+                key.string(KEY_PRODUCT_WEBSITE) -> web = valueAsString
+                key.string(KEY_PRODUCT_ISSUETRACKER) -> tracker = valueAsString
+                key.number(KEY_PRODUCT_ADDED) -> added = valueAsLong
+                key.number(KEY_PRODUCT_LASTUPDATED) -> updated = valueAsLong
+                key.string(KEY_PRODUCT_SUGGESTEDVERSIONCODE) ->
+                    suggestedVersionCode =
+                        valueAsString.toLongOrNull() ?: 0L
+
+                key.array(KEY_PRODUCT_CATEGORIES) -> categories = collectDistinctNotEmptyStrings()
+                key.array(KEY_PRODUCT_ANTIFEATURES) -> antiFeatures =
+                    collectDistinctNotEmptyStrings()
+
+                key.string(KEY_PRODUCT_LICENSE) -> licenses += valueAsString.split(',')
+                    .filter { it.isNotEmpty() }
+
+                key.string(KEY_PRODUCT_DONATE) -> donates += Regular(valueAsString)
+                key.string(KEY_PRODUCT_BITCOIN) -> donates += Bitcoin(valueAsString)
+                key.string(KEY_PRODUCT_LIBERAPAYID) -> donates += Liberapay(valueAsString)
+                key.string(KEY_PRODUCT_LITECOIN) -> donates += Litecoin(valueAsString)
+                key.string(KEY_PRODUCT_OPENCOLLECTIVE) -> donates += OpenCollective(valueAsString)
+
+                key.dictionary(KEY_PRODUCT_LOCALIZED) -> forEachKey { localizedKey ->
+                    if (localizedKey.token == JsonToken.START_OBJECT) {
+                        val locale = localizedKey.key
+                        var name = ""
+                        var summary = ""
+                        var description = ""
+                        var whatsNew = ""
+                        var metadataIcon = ""
+                        var phone = emptyList<String>()
+                        var smallTablet = emptyList<String>()
+                        var largeTablet = emptyList<String>()
+                        var wear = emptyList<String>()
+                        var tv = emptyList<String>()
+                        var video = emptyList<String>()
+                        forEachKey {
+                            when {
+                                it.string(KEY_PRODUCT_NAME) -> name = valueAsString
+                                it.string(KEY_PRODUCT_SUMMARY) -> summary = valueAsString
+                                it.string(KEY_PRODUCT_DESCRIPTION) -> description = valueAsString
+                                it.string(KEY_PRODUCT_WHATSNEW) -> whatsNew = valueAsString
+                                it.string(KEY_PRODUCT_ICON) -> metadataIcon = valueAsString
+                                it.string(KEY_PRODUCT_VIDEO) -> video = listOf(valueAsString)
+                                it.array(KEY_PRODUCT_PHONE_SCREENSHOTS) ->
+                                    phone = collectDistinctNotEmptyStrings()
+
+                                it.array(KEY_PRODUCT_SEVEN_INCH_SCREENSHOTS) ->
+                                    smallTablet = collectDistinctNotEmptyStrings()
+
+                                it.array(KEY_PRODUCT_TEN_INCH_SCREENSHOTS) ->
+                                    largeTablet = collectDistinctNotEmptyStrings()
+
+                                it.array(KEY_PRODUCT_WEAR_SCREENSHOTS) ->
+                                    wear = collectDistinctNotEmptyStrings()
+
+                                it.array(KEY_PRODUCT_TV_SCREENSHOTS) ->
+                                    tv = collectDistinctNotEmptyStrings()
+
+                                else -> skipChildren()
+                            }
+                        }
+                        val isScreenshotEmpty =
+                            arrayOf(video, phone, smallTablet, largeTablet, wear, tv)
+                                .any { it.isNotEmpty() }
+                        val screenshots =
+                            if (isScreenshotEmpty) {
+                                Screenshots(video, phone, smallTablet, largeTablet, wear, tv)
+                            } else {
+                                null
+                            }
+                        localizedMap[locale] = Localized(
+                            name = name,
+                            summary = summary,
+                            description = description,
+                            whatsNew = whatsNew,
+                            metadataIcon = metadataIcon.nullIfEmpty()?.let { "$locale/$it" }
+                                .orEmpty(),
+                            screenshots = screenshots,
+                        )
+                    } else {
+                        skipChildren()
+                    }
+                }
+
+                else -> skipChildren()
+            }
+        }
+        val name = localizedMap.findLocalizedString(nameFallback) { it.name }
+        val summary = localizedMap.findLocalizedString(summaryFallback) { it.summary }
+        val description =
+            localizedMap.findLocalizedString(descriptionFallback) { it.description }.replace(
+                "\n",
+                "<br/>"
+            )
+        val whatsNew = localizedMap.findLocalizedString("") { it.whatsNew }.replace("\n", "<br/>")
+        val metadataIcon = localizedMap.findLocalizedString("") { it.metadataIcon }.ifEmpty {
+            localizedMap.firstNotNullOfOrNull { it.value.metadataIcon }.orEmpty()
+        }
+        val screenshotPairs =
+            localizedMap.find { key, localized -> localized.screenshots?.let { Pair(key, it) } }
+        val screenshots = screenshotPairs?.let { (key, screenshots) ->
+            screenshots.video.map { Product.Screenshot(key, VIDEO, it) } +
+                screenshots.phone.map { Product.Screenshot(key, PHONE, it) } +
+                screenshots.smallTablet.map { Product.Screenshot(key, SMALL_TABLET, it) } +
+                screenshots.largeTablet.map { Product.Screenshot(key, LARGE_TABLET, it) } +
+                screenshots.wear.map { Product.Screenshot(key, WEAR, it) } +
+                screenshots.tv.map { Product.Screenshot(key, TV, it) }
+        }.orEmpty()
+        return Product(
+            repositoryId = repositoryId,
+            packageName = packageName,
+            name = name,
+            summary = summary,
+            description = description,
+            whatsNew = whatsNew,
+            icon = icon,
+            metadataIcon = metadataIcon,
+            author = Product.Author(authorName, authorEmail, authorWeb),
+            source = source,
+            changelog = changelog,
+            web = web,
+            tracker = tracker,
+            added = added,
+            updated = updated,
+            suggestedVersionCode = suggestedVersionCode,
+            categories = categories,
+            antiFeatures = antiFeatures,
+            licenses = licenses,
+            donates = donates.sortedWith(DonateComparator),
+            screenshots = screenshots,
+            releases = emptyList()
+        )
+    }
+
+    private const val KEY_RELEASE_VERSIONNAME = "versionName"
+    private const val KEY_RELEASE_VERSIONCODE = "versionCode"
+    private const val KEY_RELEASE_ADDED = "added"
+    private const val KEY_RELEASE_SIZE = "size"
+    private const val KEY_RELEASE_MINSDKVERSION = "minSdkVersion"
+    private const val KEY_RELEASE_TARGETSDKVERSION = "targetSdkVersion"
+    private const val KEY_RELEASE_MAXSDKVERSION = "maxSdkVersion"
+    private const val KEY_RELEASE_SRCNAME = "srcname"
+    private const val KEY_RELEASE_APKNAME = "apkName"
+    private const val KEY_RELEASE_HASH = "hash"
+    private const val KEY_RELEASE_HASHTYPE = "hashType"
+    private const val KEY_RELEASE_SIG = "sig"
+    private const val KEY_RELEASE_OBBMAINFILE = "obbMainFile"
+    private const val KEY_RELEASE_OBBMAINFILESHA256 = "obbMainFileSha256"
+    private const val KEY_RELEASE_OBBPATCHFILE = "obbPatchFile"
+    private const val KEY_RELEASE_OBBPATCHFILESHA256 = "obbPatchFileSha256"
+    private const val KEY_RELEASE_USESPERMISSION = "uses-permission"
+    private const val KEY_RELEASE_USESPERMISSIONSDK23 = "uses-permission-sdk-23"
+    private const val KEY_RELEASE_FEATURES = "features"
+    private const val KEY_RELEASE_NATIVECODE = "nativecode"
+
+    private fun JsonParser.parseRelease(): Release {
+        var version = ""
+        var versionCode = 0L
+        var added = 0L
+        var size = 0L
+        var minSdkVersion = 0
+        var targetSdkVersion = 0
+        var maxSdkVersion = 0
+        var source = ""
+        var release = ""
+        var hash = ""
+        var hashTypeCandidate = ""
+        var signature = ""
+        var obbMain = ""
+        var obbMainHash = ""
+        var obbPatch = ""
+        var obbPatchHash = ""
+        val permissions = linkedSetOf<String>()
+        var features = emptyList<String>()
+        var platforms = emptyList<String>()
+        forEachKey { key ->
+            when {
+                key.string(KEY_RELEASE_VERSIONNAME) -> version = valueAsString
+                key.number(KEY_RELEASE_VERSIONCODE) -> versionCode = valueAsLong
+                key.number(KEY_RELEASE_ADDED) -> added = valueAsLong
+                key.number(KEY_RELEASE_SIZE) -> size = valueAsLong
+                key.number(KEY_RELEASE_MINSDKVERSION) -> minSdkVersion = valueAsInt
+                key.number(KEY_RELEASE_TARGETSDKVERSION) -> targetSdkVersion = valueAsInt
+                key.number(KEY_RELEASE_MAXSDKVERSION) -> maxSdkVersion = valueAsInt
+                key.string(KEY_RELEASE_SRCNAME) -> source = valueAsString
+                key.string(KEY_RELEASE_APKNAME) -> release = valueAsString
+                key.string(KEY_RELEASE_HASH) -> hash = valueAsString
+                key.string(KEY_RELEASE_HASHTYPE) -> hashTypeCandidate = valueAsString
+                key.string(KEY_RELEASE_SIG) -> signature = valueAsString
+                key.string(KEY_RELEASE_OBBMAINFILE) -> obbMain = valueAsString
+                key.string(KEY_RELEASE_OBBMAINFILESHA256) -> obbMainHash = valueAsString
+                key.string(KEY_RELEASE_OBBPATCHFILE) -> obbPatch = valueAsString
+                key.string(KEY_RELEASE_OBBPATCHFILESHA256) -> obbPatchHash = valueAsString
+                key.array(KEY_RELEASE_USESPERMISSION) -> collectPermissions(permissions, 0)
+                key.array(KEY_RELEASE_USESPERMISSIONSDK23) -> collectPermissions(permissions, 23)
+                key.array(KEY_RELEASE_FEATURES) -> features = collectDistinctNotEmptyStrings()
+                key.array(KEY_RELEASE_NATIVECODE) -> platforms = collectDistinctNotEmptyStrings()
+                else -> skipChildren()
+            }
+        }
+        val hashType =
+            if (hash.isNotEmpty() && hashTypeCandidate.isEmpty()) "sha256" else hashTypeCandidate
+        val obbMainHashType = if (obbMainHash.isNotEmpty()) "sha256" else ""
+        val obbPatchHashType = if (obbPatchHash.isNotEmpty()) "sha256" else ""
+        return Release(
+            selected = false,
+            version = version,
+            versionCode = versionCode,
+            added = added,
+            size = size,
+            minSdkVersion = minSdkVersion,
+            targetSdkVersion = targetSdkVersion,
+            maxSdkVersion = maxSdkVersion,
+            source = source,
+            release = release,
+            hash = hash,
+            hashType = hashType,
+            signature = signature,
+            obbMain = obbMain,
+            obbMainHash = obbMainHash,
+            obbMainHashType = obbMainHashType,
+            obbPatch = obbPatch,
+            obbPatchHash = obbPatchHash,
+            obbPatchHashType = obbPatchHashType,
+            permissions = permissions.toList(),
+            features = features,
+            platforms = platforms,
+            incompatibilities = emptyList()
+        )
+    }
+
+    private fun JsonParser.collectPermissions(permissions: LinkedHashSet<String>, minSdk: Int) {
+        forEach(JsonToken.START_ARRAY) {
+            val firstToken = nextToken()
+            val permission = if (firstToken == JsonToken.VALUE_STRING) valueAsString else ""
+            if (firstToken != JsonToken.END_ARRAY) {
+                val secondToken = nextToken()
+                val maxSdk = if (secondToken == JsonToken.VALUE_NUMBER_INT) valueAsInt else 0
+                if (permission.isNotEmpty() &&
+                    SdkCheck.sdk >= minSdk && (
+                        maxSdk <= 0 ||
+                            SdkCheck.sdk <= maxSdk
+                        )
+                ) {
+                    permissions.add(permission)
+                }
+                if (secondToken != JsonToken.END_ARRAY) {
+                    while (true) {
+                        val token = nextToken()
+                        if (token == JsonToken.END_ARRAY) {
+                            break
+                        } else if (token.isStructStart) {
+                            skipChildren()
+                        }
+                    }
+                }
+            }
+        }
+    }
+
+    private fun validateIcon(icon: String): String {
+        return if (icon.endsWith(".xml")) "" else icon
+    }
+}

app/src/main/kotlin/com/looker/droidify/index/RepositoryUpdater.kt

@@ -0,0 +1,461 @@
+package com.looker.droidify.index
+
+import android.content.Context
+import android.net.Uri
+import com.looker.droidify.database.Database
+import com.looker.droidify.domain.model.fingerprint
+import com.looker.droidify.model.Product
+import com.looker.droidify.model.Release
+import com.looker.droidify.model.Repository
+import com.looker.droidify.network.Downloader
+import com.looker.droidify.network.NetworkResponse
+import com.looker.droidify.utility.common.SdkCheck
+import com.looker.droidify.utility.common.cache.Cache
+import com.looker.droidify.utility.common.extension.toFormattedString
+import com.looker.droidify.utility.common.result.Result
+import com.looker.droidify.utility.extension.android.Android
+import com.looker.droidify.utility.getProgress
+import kotlinx.coroutines.*
+import kotlinx.coroutines.flow.drop
+import kotlinx.coroutines.flow.filter
+import kotlinx.coroutines.flow.map
+import java.io.File
+import java.security.CodeSigner
+import java.security.cert.Certificate
+import java.util.jar.JarEntry
+import java.util.jar.JarFile
+
+object RepositoryUpdater {
+    enum class Stage {
+        DOWNLOAD, PROCESS, MERGE, COMMIT
+    }
+
+    // TODO Add support for Index-V2 and also cleanup everything here
+    enum class IndexType(
+        val jarName: String,
+        val contentName: String
+    ) {
+        INDEX_V1("index-v1.jar", "index-v1.json")
+    }
+
+    enum class ErrorType {
+        NETWORK, HTTP, VALIDATION, PARSING
+    }
+
+    class UpdateException : Exception {
+        val errorType: ErrorType
+
+        constructor(errorType: ErrorType, message: String) : super(message) {
+            this.errorType = errorType
+        }
+
+        constructor(errorType: ErrorType, message: String, cause: Exception) : super(
+            message,
+            cause
+        ) {
+            this.errorType = errorType
+        }
+    }
+
+    private val updaterLock = Any()
+    private val cleanupLock = Any()
+
+    private lateinit var downloader: Downloader
+
+    fun init(scope: CoroutineScope, downloader: Downloader) {
+        this.downloader = downloader
+        scope.launch {
+            // No need of mutex because it is in same coroutine scope
+            var lastDisabled = emptyMap<Long, Boolean>()
+            Database.RepositoryAdapter
+                .getAllRemovedStream()
+                .map { deletedRepos ->
+                    deletedRepos
+                        .filterNot { it.key in lastDisabled.keys }
+                        .also { lastDisabled = deletedRepos }
+                }
+                // To not perform complete cleanup on startup
+                .drop(1)
+                .filter { it.isNotEmpty() }
+                .collect(Database.RepositoryAdapter::cleanup)
+        }
+    }
+
+    fun await() {
+        synchronized(updaterLock) { }
+    }
+
+    suspend fun update(
+        context: Context,
+        repository: Repository,
+        unstable: Boolean,
+        callback: (Stage, Long, Long?) -> Unit
+    ) = update(
+        context = context,
+        repository = repository,
+        unstable = unstable,
+        indexTypes = listOf(IndexType.INDEX_V1),
+        callback = callback
+    )
+
+    private suspend fun update(
+        context: Context,
+        repository: Repository,
+        unstable: Boolean,
+        indexTypes: List<IndexType>,
+        callback: (Stage, Long, Long?) -> Unit
+    ): Result<Boolean> = withContext(Dispatchers.IO) {
+        val indexType = indexTypes[0]
+        when (val request = downloadIndex(context, repository, indexType, callback)) {
+            is Result.Error -> {
+                val result = request.data
+                    ?: return@withContext Result.Error(request.exception, false)
+
+                val file = request.data?.file
+                    ?: return@withContext Result.Error(request.exception, false)
+                file.delete()
+                if (result.statusCode == 404 && indexTypes.isNotEmpty()) {
+                    update(
+                        context = context,
+                        repository = repository,
+                        indexTypes = indexTypes.subList(1, indexTypes.size),
+                        unstable = unstable,
+                        callback = callback
+                    )
+                } else {
+                    Result.Error(
+                        UpdateException(
+                            ErrorType.HTTP,
+                            "Invalid response: HTTP ${result.statusCode}"
+                        )
+                    )
+                }
+            }
+
+            is Result.Success -> {
+                if (request.data.isUnmodified) {
+                    request.data.file.delete()
+                    Result.Success(false)
+                } else {
+                    try {
+                        val isFileParsedSuccessfully = processFile(
+                            context = context,
+                            repository = repository,
+                            indexType = indexType,
+                            unstable = unstable,
+                            file = request.data.file,
+                            lastModified = request.data.lastModified,
+                            entityTag = request.data.entityTag,
+                            callback = callback
+                        )
+                        Result.Success(isFileParsedSuccessfully)
+                    } catch (e: UpdateException) {
+                        Result.Error(e)
+                    }
+                }
+            }
+        }
+    }
+
+    private suspend fun downloadIndex(
+        context: Context,
+        repository: Repository,
+        indexType: IndexType,
+        callback: (Stage, Long, Long?) -> Unit
+    ): Result<IndexFile> = withContext(Dispatchers.IO) {
+        val file = Cache.getTemporaryFile(context)
+        val result = downloader.downloadToFile(
+            url = Uri.parse(repository.address).buildUpon()
+                .appendPath(indexType.jarName).build().toString(),
+            target = file,
+            headers = {
+                ifModifiedSince(repository.lastModified)
+                etag(repository.entityTag)
+                authentication(repository.authentication)
+            }
+        ) { read, total ->
+            callback(Stage.DOWNLOAD, read.value, total.value.takeIf { it != 0L })
+        }
+
+        when (result) {
+            is NetworkResponse.Success -> {
+                Result.Success(
+                    IndexFile(
+                        isUnmodified = result.statusCode == 304,
+                        lastModified = result.lastModified?.toFormattedString() ?: "",
+                        entityTag = result.etag ?: "",
+                        statusCode = result.statusCode,
+                        file = file
+                    )
+                )
+            }
+
+            is NetworkResponse.Error -> {
+                file.delete()
+                when (result) {
+                    is NetworkResponse.Error.Http -> {
+                        val errorType = if (result.statusCode in 400..499) {
+                            ErrorType.HTTP
+                        } else {
+                            ErrorType.NETWORK
+                        }
+
+                        Result.Error(
+                            UpdateException(
+                                errorType = errorType,
+                                message = "Failed with Status: ${result.statusCode}"
+                            )
+                        )
+                    }
+
+                    is NetworkResponse.Error.ConnectionTimeout -> Result.Error(result.exception)
+                    is NetworkResponse.Error.IO -> Result.Error(result.exception)
+                    is NetworkResponse.Error.SocketTimeout -> Result.Error(result.exception)
+                    is NetworkResponse.Error.Unknown -> Result.Error(result.exception)
+                    // TODO: Add Validator
+                    is NetworkResponse.Error.Validation -> Result.Error()
+                }
+            }
+        }
+    }
+
+    fun processFile(
+        context: Context,
+        repository: Repository,
+        indexType: IndexType,
+        unstable: Boolean,
+        file: File,
+        mergerFile: File = Cache.getTemporaryFile(context),
+        lastModified: String,
+        entityTag: String,
+        callback: (Stage, Long, Long?) -> Unit
+    ): Boolean {
+        var rollback = true
+        return synchronized(updaterLock) {
+            try {
+                val jarFile = JarFile(file, true)
+                val indexEntry = jarFile.getEntry(indexType.contentName) as JarEntry
+                val total = indexEntry.size
+                Database.UpdaterAdapter.createTemporaryTable()
+                val features = context.packageManager.systemAvailableFeatures
+                    .asSequence().map { it.name }.toSet() + setOf("android.hardware.touchscreen")
+
+                var changedRepository: Repository? = null
+
+                try {
+                    val unmergedProducts = mutableListOf<Product>()
+                    val unmergedReleases = mutableListOf<Pair<String, List<Release>>>()
+                    IndexMerger(mergerFile).use { indexMerger ->
+                        jarFile.getInputStream(indexEntry).getProgress {
+                            callback(Stage.PROCESS, it, total)
+                        }.use { entryStream ->
+                            IndexV1Parser.parse(
+                                repository.id,
+                                entryStream,
+                                object : IndexV1Parser.Callback {
+                                    override fun onRepository(
+                                        mirrors: List<String>,
+                                        name: String,
+                                        description: String,
+                                        version: Int,
+                                        timestamp: Long
+                                    ) {
+                                        changedRepository = repository.update(
+                                            mirrors,
+                                            name,
+                                            description,
+                                            version,
+                                            lastModified,
+                                            entityTag,
+                                            timestamp
+                                        )
+                                    }
+
+                                    override fun onProduct(product: Product) {
+                                        if (Thread.interrupted()) {
+                                            throw InterruptedException()
+                                        }
+                                        unmergedProducts += product
+                                        if (unmergedProducts.size >= 50) {
+                                            indexMerger.addProducts(unmergedProducts)
+                                            unmergedProducts.clear()
+                                        }
+                                    }
+
+                                    override fun onReleases(
+                                        packageName: String,
+                                        releases: List<Release>
+                                    ) {
+                                        if (Thread.interrupted()) {
+                                            throw InterruptedException()
+                                        }
+                                        unmergedReleases += Pair(packageName, releases)
+                                        if (unmergedReleases.size >= 50) {
+                                            indexMerger.addReleases(unmergedReleases)
+                                            unmergedReleases.clear()
+                                        }
+                                    }
+                                }
+                            )
+
+                            if (Thread.interrupted()) {
+                                throw InterruptedException()
+                            }
+                            if (unmergedProducts.isNotEmpty()) {
+                                indexMerger.addProducts(unmergedProducts)
+                                unmergedProducts.clear()
+                            }
+                            if (unmergedReleases.isNotEmpty()) {
+                                indexMerger.addReleases(unmergedReleases)
+                                unmergedReleases.clear()
+                            }
+                            var progress = 0
+                            indexMerger.forEach(repository.id, 50) { products, totalCount ->
+                                if (Thread.interrupted()) {
+                                    throw InterruptedException()
+                                }
+                                progress += products.size
+                                callback(
+                                    Stage.MERGE,
+                                    progress.toLong(),
+                                    totalCount.toLong()
+                                )
+                                Database.UpdaterAdapter.putTemporary(
+                                    products
+                                        .map { transformProduct(it, features, unstable) }
+                                )
+                            }
+                        }
+                    }
+                } finally {
+                    mergerFile.delete()
+                }
+
+                val workRepository = changedRepository ?: repository
+                if (workRepository.timestamp < repository.timestamp) {
+                    throw UpdateException(
+                        ErrorType.VALIDATION,
+                        "New index is older than current index:" +
+                            " ${workRepository.timestamp} < ${repository.timestamp}"
+                    )
+                }
+
+                val fingerprint = indexEntry
+                    .codeSigner
+                    .certificate
+                    .fingerprint()
+                    .toString()
+                    .uppercase()
+
+                val commitRepository = if (!workRepository.fingerprint.equals(
+                        fingerprint,
+                        ignoreCase = true
+                    )
+                ) {
+                    if (workRepository.fingerprint.isNotEmpty()) {
+                        throw UpdateException(
+                            ErrorType.VALIDATION,
+                            "Certificate fingerprints do not match"
+                        )
+                    }
+
+                    workRepository.copy(fingerprint = fingerprint)
+                } else {
+                    workRepository
+                }
+                if (Thread.interrupted()) {
+                    throw InterruptedException()
+                }
+                callback(Stage.COMMIT, 0, null)
+                synchronized(cleanupLock) {
+                    Database.UpdaterAdapter.finishTemporary(commitRepository, true)
+                }
+                rollback = false
+                true
+            } catch (e: Exception) {
+                throw when (e) {
+                    is UpdateException, is InterruptedException -> e
+                    else -> UpdateException(ErrorType.PARSING, "Error parsing index", e)
+                }
+            } finally {
+                file.delete()
+                if (rollback) {
+                    Database.UpdaterAdapter.finishTemporary(repository, false)
+                }
+            }
+        }
+    }
+
+    @get:Throws(UpdateException::class)
+    private val JarEntry.codeSigner: CodeSigner
+        get() = codeSigners?.singleOrNull()
+            ?: throw UpdateException(
+                ErrorType.VALIDATION,
+                "index.jar must be signed by a single code signer"
+            )
+
+    @get:Throws(UpdateException::class)
+    private val CodeSigner.certificate: Certificate
+        get() = signerCertPath?.certificates?.singleOrNull()
+            ?: throw UpdateException(
+                ErrorType.VALIDATION,
+                "index.jar code signer should have only one certificate"
+            )
+
+    private fun transformProduct(
+        product: Product,
+        features: Set<String>,
+        unstable: Boolean
+    ): Product {
+        val releasePairs = product.releases
+            .distinctBy { it.identifier }
+            .sortedByDescending { it.versionCode }
+            .map { release ->
+                val incompatibilities = mutableListOf<Release.Incompatibility>()
+                if (release.minSdkVersion > 0 && SdkCheck.sdk < release.minSdkVersion) {
+                    incompatibilities += Release.Incompatibility.MinSdk
+                }
+                if (release.maxSdkVersion > 0 && SdkCheck.sdk > release.maxSdkVersion) {
+                    incompatibilities += Release.Incompatibility.MaxSdk
+                }
+                if (release.platforms.isNotEmpty() &&
+                    (release.platforms intersect Android.platforms).isEmpty()
+                ) {
+                    incompatibilities += Release.Incompatibility.Platform
+                }
+                incompatibilities += (release.features - features).sorted()
+                    .map { Release.Incompatibility.Feature(it) }
+                Pair(release, incompatibilities.toList())
+            }
+
+        val predicate: (Release) -> Boolean = {
+            unstable ||
+                product.suggestedVersionCode <= 0 ||
+                it.versionCode <= product.suggestedVersionCode
+        }
+
+        val firstSelected =
+            releasePairs.firstOrNull { it.second.isEmpty() && predicate(it.first) }
+                ?: releasePairs.firstOrNull { predicate(it.first) }
+
+        val releases = releasePairs
+            .map { (release, incompatibilities) ->
+                release.copy(
+                    incompatibilities = incompatibilities,
+                    selected = firstSelected?.let {
+                        it.first.versionCode == release.versionCode &&
+                            it.second == incompatibilities
+                    } ?: false
+                )
+            }
+        return product.copy(releases = releases)
+    }
+}
+
+data class IndexFile(
+    val isUnmodified: Boolean,
+    val lastModified: String,
+    val entityTag: String,
+    val statusCode: Int,
+    val file: File
+)

app/src/main/kotlin/com/looker/droidify/installer/InstallManager.kt

@@ -0,0 +1,129 @@
+package com.looker.droidify.installer
+
+import android.content.Context
+import com.looker.droidify.utility.common.extension.addAndCompute
+import com.looker.droidify.utility.common.extension.filter
+import com.looker.droidify.utility.common.extension.notificationManager
+import com.looker.droidify.utility.common.extension.updateAsMutable
+import com.looker.droidify.datastore.SettingsRepository
+import com.looker.droidify.datastore.get
+import com.looker.droidify.datastore.model.InstallerType
+import com.looker.droidify.domain.model.PackageName
+import com.looker.droidify.installer.installers.Installer
+import com.looker.droidify.installer.installers.LegacyInstaller
+import com.looker.droidify.installer.installers.root.RootInstaller
+import com.looker.droidify.installer.installers.session.SessionInstaller
+import com.looker.droidify.installer.installers.shizuku.ShizukuInstaller
+import com.looker.droidify.installer.model.InstallItem
+import com.looker.droidify.installer.model.InstallState
+import com.looker.droidify.installer.notification.createInstallNotification
+import com.looker.droidify.installer.notification.installNotification
+import com.looker.droidify.installer.notification.removeInstallNotification
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.channels.Channel
+import kotlinx.coroutines.channels.consumeEach
+import kotlinx.coroutines.coroutineScope
+import kotlinx.coroutines.flow.MutableStateFlow
+import kotlinx.coroutines.flow.collectLatest
+import kotlinx.coroutines.flow.update
+import kotlinx.coroutines.launch
+import kotlinx.coroutines.sync.Mutex
+import kotlinx.coroutines.sync.withLock
+
+class InstallManager(
+    private val context: Context,
+    settingsRepository: SettingsRepository
+) {
+
+    private val installItems = Channel<InstallItem>()
+    private val uninstallItems = Channel<PackageName>()
+
+    val state = MutableStateFlow<Map<PackageName, InstallState>>(emptyMap())
+
+    private var _installer: Installer? = null
+        set(value) {
+            field?.close()
+            field = value
+        }
+    private val installer: Installer get() = _installer!!
+
+    private val lock = Mutex()
+    private val installerPreference = settingsRepository.get { installerType }
+
+    suspend operator fun invoke() = coroutineScope {
+        setupInstaller()
+        installer()
+        uninstaller()
+    }
+
+    fun close() {
+        _installer = null
+        uninstallItems.close()
+        installItems.close()
+    }
+
+    suspend infix fun install(installItem: InstallItem) {
+        installItems.send(installItem)
+    }
+
+    suspend infix fun uninstall(packageName: PackageName) {
+        uninstallItems.send(packageName)
+    }
+
+    infix fun remove(packageName: PackageName) {
+        updateState { remove(packageName) }
+    }
+
+    private fun CoroutineScope.setupInstaller() = launch {
+        installerPreference.collectLatest(::setInstaller)
+    }
+
+    private fun CoroutineScope.installer() = launch {
+        val currentQueue = mutableSetOf<String>()
+        installItems.filter { item ->
+            currentQueue.addAndCompute(item.packageName.name) { isAdded ->
+                if (isAdded) {
+                    updateState { put(item.packageName, InstallState.Pending) }
+                }
+            }
+        }.consumeEach { item ->
+            if (state.value.containsKey(item.packageName)) {
+                updateState { put(item.packageName, InstallState.Installing) }
+                context.notificationManager?.installNotification(
+                    packageName = item.packageName.name,
+                    notification = context.createInstallNotification(
+                        appName = item.packageName.name,
+                        state = InstallState.Installing,
+                    )
+                )
+                val success = installer.use {
+                    it.install(item)
+                }
+                context.notificationManager?.removeInstallNotification(item.packageName.name)
+                updateState { put(item.packageName, success) }
+                currentQueue.remove(item.packageName.name)
+            }
+        }
+    }
+
+    private fun CoroutineScope.uninstaller() = launch {
+        uninstallItems.consumeEach {
+            installer.uninstall(it)
+        }
+    }
+
+    private suspend fun setInstaller(installerType: InstallerType) {
+        lock.withLock {
+            _installer = when (installerType) {
+                InstallerType.LEGACY -> LegacyInstaller(context)
+                InstallerType.SESSION -> SessionInstaller(context)
+                InstallerType.SHIZUKU -> ShizukuInstaller(context)
+                InstallerType.ROOT -> RootInstaller(context)
+            }
+        }
+    }
+
+    private inline fun updateState(block: MutableMap<PackageName, InstallState>.() -> Unit) {
+        state.update { it.updateAsMutable(block) }
+    }
+}

app/src/main/kotlin/com/looker/droidify/installer/installers/Installer.kt

@@ -0,0 +1,13 @@
+package com.looker.droidify.installer.installers
+
+import com.looker.droidify.domain.model.PackageName
+import com.looker.droidify.installer.model.InstallItem
+import com.looker.droidify.installer.model.InstallState
+
+interface Installer : AutoCloseable {
+
+    suspend fun install(installItem: InstallItem): InstallState
+
+    suspend fun uninstall(packageName: PackageName)
+
+}

app/src/main/kotlin/com/looker/droidify/installer/installers/InstallerPermission.kt

@@ -0,0 +1,60 @@
+package com.looker.droidify.installer.installers
+
+import android.content.ComponentName
+import android.content.Context
+import android.content.Intent
+import android.content.pm.PackageManager
+import com.looker.droidify.utility.common.extension.getLauncherActivities
+import com.looker.droidify.utility.common.extension.getPackageInfoCompat
+import com.looker.droidify.utility.common.extension.intent
+import kotlinx.coroutines.suspendCancellableCoroutine
+import rikka.shizuku.ShizukuProvider
+import kotlin.coroutines.resume
+
+private const val SHIZUKU_PERMISSION_REQUEST_CODE = 87263
+
+fun launchShizuku(context: Context) {
+    val activities =
+        context.packageManager.getLauncherActivities(ShizukuProvider.MANAGER_APPLICATION_ID)
+    val intent = intent(Intent.ACTION_MAIN) {
+        addCategory(Intent.CATEGORY_LAUNCHER)
+        setComponent(
+            ComponentName(
+                ShizukuProvider.MANAGER_APPLICATION_ID,
+                activities.first().first
+            )
+        )
+        setFlags(Intent.FLAG_ACTIVITY_NEW_TASK)
+    }
+    context.startActivity(intent)
+}
+
+fun isShizukuInstalled(context: Context) =
+    context.packageManager.getPackageInfoCompat(ShizukuProvider.MANAGER_APPLICATION_ID) != null
+
+fun isShizukuAlive() = rikka.shizuku.Shizuku.pingBinder()
+
+fun isShizukuGranted() = rikka.shizuku.Shizuku.checkSelfPermission() == PackageManager.PERMISSION_GRANTED
+
+suspend fun requestPermissionListener() = suspendCancellableCoroutine {
+    val listener = rikka.shizuku.Shizuku.OnRequestPermissionResultListener { requestCode, grantResult ->
+        if (requestCode == SHIZUKU_PERMISSION_REQUEST_CODE) {
+            it.resume(grantResult == PackageManager.PERMISSION_GRANTED)
+        }
+    }
+    rikka.shizuku.Shizuku.addRequestPermissionResultListener(listener)
+    rikka.shizuku.Shizuku.requestPermission(SHIZUKU_PERMISSION_REQUEST_CODE)
+    it.invokeOnCancellation {
+        rikka.shizuku.Shizuku.removeRequestPermissionResultListener(listener)
+    }
+}
+
+fun requestShizuku() {
+    rikka.shizuku.Shizuku.shouldShowRequestPermissionRationale()
+    rikka.shizuku.Shizuku.requestPermission(SHIZUKU_PERMISSION_REQUEST_CODE)
+}
+
+fun isMagiskGranted(): Boolean {
+    com.topjohnwu.superuser.Shell.getCachedShell() ?: com.topjohnwu.superuser.Shell.getShell()
+    return com.topjohnwu.superuser.Shell.isAppGrantedRoot() == true
+}

app/src/main/kotlin/com/looker/droidify/installer/installers/LegacyInstaller.kt

@@ -0,0 +1,71 @@
+package com.looker.droidify.installer.installers
+
+import android.content.Context
+import android.content.Intent
+import android.util.AndroidRuntimeException
+import androidx.core.net.toUri
+import com.looker.droidify.domain.model.PackageName
+import com.looker.droidify.installer.model.InstallItem
+import com.looker.droidify.installer.model.InstallState
+import com.looker.droidify.utility.common.SdkCheck
+import com.looker.droidify.utility.common.cache.Cache
+import com.looker.droidify.utility.common.extension.intent
+import kotlinx.coroutines.suspendCancellableCoroutine
+import kotlin.coroutines.resume
+
+@Suppress("DEPRECATION")
+class LegacyInstaller(private val context: Context) : Installer {
+
+    companion object {
+        private const val APK_MIME = "application/vnd.android.package-archive"
+    }
+
+    override suspend fun install(
+        installItem: InstallItem,
+    ): InstallState = suspendCancellableCoroutine { cont ->
+        val installFlag = if (SdkCheck.isNougat) Intent.FLAG_GRANT_READ_URI_PERMISSION else 0
+        val fileUri = if (SdkCheck.isNougat) {
+            Cache.getReleaseUri(
+                context,
+                installItem.installFileName
+            )
+        } else {
+            Cache.getReleaseFile(context, installItem.installFileName).toUri()
+        }
+        val installIntent = intent(Intent.ACTION_INSTALL_PACKAGE) {
+            setDataAndType(fileUri, APK_MIME)
+            flags = installFlag
+        }
+        try {
+            context.startActivity(installIntent)
+            cont.resume(InstallState.Installed)
+        } catch (e: AndroidRuntimeException) {
+            installIntent.flags = installFlag or Intent.FLAG_ACTIVITY_NEW_TASK
+            context.startActivity(installIntent)
+            cont.resume(InstallState.Installed)
+        } catch (e: Exception) {
+            cont.resume(InstallState.Failed)
+        }
+    }
+
+    override suspend fun uninstall(packageName: PackageName) =
+        context.uninstallPackage(packageName)
+
+    override fun close() {}
+}
+
+suspend fun Context.uninstallPackage(packageName: PackageName) =
+    suspendCancellableCoroutine { cont ->
+        try {
+            startActivity(
+                intent(Intent.ACTION_UNINSTALL_PACKAGE) {
+                    data = "package:${packageName.name}".toUri()
+                    flags = Intent.FLAG_ACTIVITY_NEW_TASK
+                }
+            )
+            cont.resume(Unit)
+        } catch (e: Exception) {
+            e.printStackTrace()
+            cont.resume(Unit)
+        }
+    }

app/src/main/kotlin/com/looker/droidify/installer/installers/root/RootInstaller.kt

@@ -0,0 +1,69 @@
+package com.looker.droidify.installer.installers.root
+
+import android.content.Context
+import com.looker.droidify.domain.model.PackageName
+import com.looker.droidify.installer.installers.Installer
+import com.looker.droidify.installer.installers.uninstallPackage
+import com.looker.droidify.installer.model.InstallItem
+import com.looker.droidify.installer.model.InstallState
+import com.looker.droidify.utility.common.SdkCheck
+import com.looker.droidify.utility.common.cache.Cache
+import com.topjohnwu.superuser.Shell
+import kotlinx.coroutines.suspendCancellableCoroutine
+import kotlin.coroutines.resume
+
+class RootInstaller(private val context: Context) : Installer {
+
+    override suspend fun install(
+        installItem: InstallItem,
+    ): InstallState = suspendCancellableCoroutine { cont ->
+        val releaseFile = Cache.getReleaseFile(context, installItem.installFileName)
+        val installCommand = INSTALL_COMMAND.format(
+            releaseFile.absolutePath,
+            currentUser(),
+            releaseFile.length(),
+        )
+        Shell.cmd(installCommand).submit { shellResult ->
+            val result = if (shellResult.isSuccess) InstallState.Installed
+            else InstallState.Failed
+            cont.resume(result)
+            val deleteCommand = DELETE_COMMAND.format(utilBox(), releaseFile.absolutePath)
+            Shell.cmd(deleteCommand).submit()
+        }
+    }
+
+    override suspend fun uninstall(packageName: PackageName) =
+        context.uninstallPackage(packageName)
+
+    override fun close() {}
+
+}
+
+private const val INSTALL_COMMAND = "cat %s | pm install --user %s -t -r -S %s"
+private const val DELETE_COMMAND = "%s rm %s"
+
+/** Returns the path of either toybox or busybox, or empty string if not found. */
+private fun utilBox(): String {
+    listOf("toybox", "busybox").forEach {
+        // Returns the path of the requested [command], or empty string if not found
+        val out = Shell.cmd("which $it").exec().out
+        if (out.isEmpty()) return ""
+        if (out.first().contains("not found")) return ""
+        return out.first()
+    }
+    return ""
+}
+
+/** Returns the current user of the device. */
+private fun currentUser() = if (SdkCheck.isOreo) {
+    Shell.cmd("am get-current-user")
+        .exec()
+        .out[0]
+} else {
+    Shell.cmd("dumpsys activity | grep -E \"mUserLru\"")
+        .exec()
+        .out[0]
+        .trim()
+        .removePrefix("mUserLru: [")
+        .removeSuffix("]")
+}

app/src/main/kotlin/com/looker/droidify/installer/installers/session/SessionInstaller.kt

@@ -0,0 +1,111 @@
+package com.looker.droidify.installer.installers.session
+
+import android.annotation.SuppressLint
+import android.app.PendingIntent
+import android.content.Context
+import android.content.Intent
+import android.content.pm.PackageInstaller
+import android.os.Build
+import android.os.Handler
+import android.os.Looper
+import android.util.Log
+import com.looker.droidify.utility.common.SdkCheck
+import com.looker.droidify.utility.common.cache.Cache
+import com.looker.droidify.utility.common.log
+import com.looker.droidify.utility.common.sdkAbove
+import com.looker.droidify.domain.model.PackageName
+import com.looker.droidify.installer.installers.Installer
+import com.looker.droidify.installer.model.InstallItem
+import com.looker.droidify.installer.model.InstallState
+import kotlinx.coroutines.suspendCancellableCoroutine
+import kotlin.coroutines.resume
+
+class SessionInstaller(private val context: Context) : Installer {
+
+    private val installer = context.packageManager.packageInstaller
+    private val intent = Intent(context, SessionInstallerReceiver::class.java)
+
+    companion object {
+        private var installerCallbacks: PackageInstaller.SessionCallback? = null
+        private val flags = if (SdkCheck.isSnowCake) PendingIntent.FLAG_MUTABLE else 0
+        private val sessionParams =
+            PackageInstaller.SessionParams(PackageInstaller.SessionParams.MODE_FULL_INSTALL).apply {
+                sdkAbove(sdk = Build.VERSION_CODES.S) {
+                    setRequireUserAction(PackageInstaller.SessionParams.USER_ACTION_NOT_REQUIRED)
+                }
+                sdkAbove(sdk = Build.VERSION_CODES.UPSIDE_DOWN_CAKE) {
+                    setRequestUpdateOwnership(true)
+                }
+            }
+    }
+
+    override suspend fun install(
+        installItem: InstallItem
+    ): InstallState = suspendCancellableCoroutine { cont ->
+        val cacheFile = Cache.getReleaseFile(context, installItem.installFileName)
+        val id = installer.createSession(sessionParams)
+        val installerCallback = object : PackageInstaller.SessionCallback() {
+            override fun onCreated(sessionId: Int) {}
+            override fun onBadgingChanged(sessionId: Int) {}
+            override fun onActiveChanged(sessionId: Int, active: Boolean) {}
+            override fun onProgressChanged(sessionId: Int, progress: Float) {}
+            override fun onFinished(sessionId: Int, success: Boolean) {
+                if (sessionId == id) cont.resume(InstallState.Installed)
+            }
+        }
+        installerCallbacks = installerCallback
+
+        installer.registerSessionCallback(
+            installerCallbacks!!,
+            Handler(Looper.getMainLooper())
+        )
+
+        val session = installer.openSession(id)
+
+        session.use { activeSession ->
+            val sizeBytes = cacheFile.length()
+            cacheFile.inputStream().use { fileStream ->
+                activeSession.openWrite(cacheFile.name, 0, sizeBytes).use { outputStream ->
+                    if (cont.isActive) {
+                        fileStream.copyTo(outputStream)
+                        activeSession.fsync(outputStream)
+                    }
+                }
+            }
+
+            val pendingIntent = PendingIntent.getBroadcast(context, id, intent, flags)
+
+            if (cont.isActive) activeSession.commit(pendingIntent.intentSender)
+        }
+
+        cont.invokeOnCancellation {
+            try {
+                installer.abandonSession(id)
+            } catch (e: SecurityException) {
+                e.printStackTrace()
+            }
+        }
+    }
+
+    @SuppressLint("MissingPermission")
+    override suspend fun uninstall(packageName: PackageName) =
+        suspendCancellableCoroutine { cont ->
+            intent.putExtra(SessionInstallerReceiver.ACTION_UNINSTALL, true)
+            val pendingIntent = PendingIntent.getBroadcast(context, -1, intent, flags)
+
+            installer.uninstall(packageName.name, pendingIntent.intentSender)
+            cont.resume(Unit)
+        }
+
+    override fun close() {
+        installerCallbacks?.let {
+            installer.unregisterSessionCallback(it)
+            installerCallbacks = null
+        }
+        try {
+            installer.mySessions.forEach { installer.abandonSession(it.sessionId) }
+        } catch (e: SecurityException) {
+            log(e.message, type = Log.ERROR)
+        }
+    }
+}

app/src/main/kotlin/com/looker/droidify/installer/installers/session/SessionInstallerReceiver.kt

@@ -0,0 +1,106 @@
+package com.looker.droidify.installer.installers.session
+
+import android.content.BroadcastReceiver
+import android.content.Context
+import android.content.Intent
+import android.content.pm.PackageInstaller
+import com.looker.droidify.utility.common.Constants.NOTIFICATION_CHANNEL_INSTALL
+import com.looker.droidify.R
+import com.looker.droidify.utility.common.createNotificationChannel
+import com.looker.droidify.utility.common.extension.getPackageName
+import com.looker.droidify.utility.common.extension.notificationManager
+import com.looker.droidify.domain.model.toPackageName
+import com.looker.droidify.installer.InstallManager
+import com.looker.droidify.installer.model.InstallState
+import com.looker.droidify.installer.notification.createInstallNotification
+import com.looker.droidify.installer.notification.installNotification
+import com.looker.droidify.installer.notification.removeInstallNotification
+import dagger.hilt.android.AndroidEntryPoint
+import javax.inject.Inject
+
+@AndroidEntryPoint
+class SessionInstallerReceiver : BroadcastReceiver() {
+
+    // This is a cyclic dependency injection, I know but this is the best option for now
+    @Inject
+    lateinit var installManager: InstallManager
+
+    override fun onReceive(context: Context, intent: Intent) {
+        val status = intent.getIntExtra(PackageInstaller.EXTRA_STATUS, -1)
+
+        if (status == PackageInstaller.STATUS_PENDING_USER_ACTION) {
+            // prompts user to enable unknown source
+            val promptIntent: Intent? = intent.getParcelableExtra(Intent.EXTRA_INTENT)
+
+            promptIntent?.let {
+                it.putExtra(Intent.EXTRA_NOT_UNKNOWN_SOURCE, true)
+                it.putExtra(Intent.EXTRA_INSTALLER_PACKAGE_NAME, "com.android.vending")
+                it.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK)
+
+                context.startActivity(it)
+            }
+        } else {
+            notifyStatus(intent, context)
+        }
+    }
+
+    private fun notifyStatus(intent: Intent, context: Context) {
+        val packageManager = context.packageManager
+        val notificationManager = context.notificationManager
+
+        context.createNotificationChannel(
+            id = NOTIFICATION_CHANNEL_INSTALL,
+            name = context.getString(R.string.install)
+        )
+
+        val status = intent.getIntExtra(PackageInstaller.EXTRA_STATUS, -1)
+        val packageName = intent.getStringExtra(PackageInstaller.EXTRA_PACKAGE_NAME)
+        val message = intent.getStringExtra(PackageInstaller.EXTRA_STATUS_MESSAGE)
+        val isUninstall = intent.getBooleanExtra(ACTION_UNINSTALL, false)
+
+        val appName = packageManager.getPackageName(packageName)
+
+        if (packageName != null) {
+            when (status) {
+                PackageInstaller.STATUS_SUCCESS -> {
+                    notificationManager?.removeInstallNotification(packageName)
+                    val notification = context.createInstallNotification(
+                        appName = (appName ?: packageName.substringAfterLast('.')).toString(),
+                        state = InstallState.Installed,
+                        isUninstall = isUninstall,
+                    ) {
+                        setTimeoutAfter(SUCCESS_TIMEOUT)
+                    }
+                    notificationManager?.installNotification(
+                        packageName = packageName.toString(),
+                        notification = notification,
+                    )
+                }
+
+                PackageInstaller.STATUS_FAILURE_ABORTED -> {
+                    installManager.remove(packageName.toPackageName())
+                }
+
+                else -> {
+                    installManager.remove(packageName.toPackageName())
+                    val notification = context.createInstallNotification(
+                        appName = appName.toString(),
+                        state = InstallState.Failed,
+                    ) {
+                        setContentText(message)
+                    }
+                    notificationManager?.installNotification(
+                        packageName = packageName,
+                        notification = notification
+                    )
+                }
+            }
+        }
+    }
+
+    companion object {
+        const val ACTION_UNINSTALL = "action_uninstall"
+
+        private const val SUCCESS_TIMEOUT = 5_000L
+    }
+}

app/src/main/kotlin/com/looker/droidify/installer/installers/shizuku/ShizukuInstaller.kt

@@ -0,0 +1,87 @@
+package com.looker.droidify.installer.installers.shizuku
+
+import android.content.Context
+import com.looker.droidify.utility.common.SdkCheck
+import com.looker.droidify.utility.common.cache.Cache
+import com.looker.droidify.utility.common.extension.size
+import com.looker.droidify.domain.model.PackageName
+import com.looker.droidify.installer.installers.Installer
+import com.looker.droidify.installer.installers.uninstallPackage
+import com.looker.droidify.installer.model.InstallItem
+import com.looker.droidify.installer.model.InstallState
+import kotlinx.coroutines.suspendCancellableCoroutine
+import java.io.BufferedReader
+import java.io.InputStream
+import kotlin.coroutines.resume
+
+class ShizukuInstaller(private val context: Context) : Installer {
+
+    companion object {
+        private val SESSION_ID_REGEX = Regex("(?<=\\[).+?(?=])")
+    }
+
+    override suspend fun install(
+        installItem: InstallItem
+    ): InstallState = suspendCancellableCoroutine { cont ->
+        var sessionId: String? = null
+        val file = Cache.getReleaseFile(context, installItem.installFileName)
+        val packageName = installItem.packageName.name
+        try {
+            val fileSize = file.size ?: run {
+                cont.cancel()
+                error("File is not valid: Size ${file.size}")
+            }
+            if (cont.isCompleted) return@suspendCancellableCoroutine
+            file.inputStream().use {
+                val createCommand =
+                    if (SdkCheck.isNougat) {
+                        "pm install-create --user current -i $packageName -S $fileSize"
+                    } else {
+                        "pm install-create -i $packageName -S $fileSize"
+                    }
+                val createResult = exec(createCommand)
+                sessionId = SESSION_ID_REGEX.find(createResult.out)?.value
+                    ?: run {
+                        cont.cancel()
+                        throw RuntimeException("Failed to create install session")
+                    }
+                if (cont.isCompleted) return@suspendCancellableCoroutine
+
+                val writeResult = exec("pm install-write -S $fileSize $sessionId base -", it)
+                if (writeResult.resultCode != 0) {
+                    cont.cancel()
+                    throw RuntimeException("Failed to write APK to session $sessionId")
+                }
+                if (cont.isCompleted) return@suspendCancellableCoroutine
+
+                val commitResult = exec("pm install-commit $sessionId")
+                if (commitResult.resultCode != 0) {
+                    cont.cancel()
+                    throw RuntimeException("Failed to commit install session $sessionId")
+                }
+                if (cont.isCompleted) return@suspendCancellableCoroutine
+                cont.resume(InstallState.Installed)
+            }
+        } catch (e: Exception) {
+            if (sessionId != null) exec("pm install-abandon $sessionId")
+            cont.resume(InstallState.Failed)
+        }
+    }
+
+    override suspend fun uninstall(packageName: PackageName) =
+        context.uninstallPackage(packageName)
+
+    override fun close() {}
+
+    private data class ShellResult(val resultCode: Int, val out: String)
+
+    private fun exec(command: String, stdin: InputStream? = null): ShellResult {
+        val process = rikka.shizuku.Shizuku.newProcess(arrayOf("sh", "-c", command), null, null)
+        if (stdin != null) {
+            process.outputStream.use { stdin.copyTo(it) }
+        }
+        val output = process.inputStream.bufferedReader().use(BufferedReader::readText)
+        val resultCode = process.waitFor()
+        return ShellResult(resultCode, output)
+    }
+}

app/src/main/kotlin/com/looker/droidify/installer/model/InstallItem.kt

@@ -0,0 +1,11 @@
+package com.looker.droidify.installer.model
+
+import com.looker.droidify.domain.model.PackageName
+import com.looker.droidify.domain.model.toPackageName
+
+class InstallItem(
+    val packageName: PackageName,
+    val installFileName: String
+)
+
+infix fun String.installFrom(fileName: String) = InstallItem(this.toPackageName(), fileName)

app/src/main/kotlin/com/looker/droidify/installer/model/InstallState.kt

@@ -0,0 +1,6 @@
+package com.looker.droidify.installer.model
+
+enum class InstallState { Failed, Pending, Installing, Installed }
+
+inline val InstallState.isCancellable: Boolean
+    get() = this == InstallState.Pending

app/src/main/kotlin/com/looker/droidify/installer/notification/InstallNotification.kt

@@ -0,0 +1,87 @@
+package com.looker.droidify.installer.notification
+
+import android.app.Notification
+import android.app.NotificationManager
+import android.content.Context
+import android.graphics.Color
+import androidx.core.app.NotificationCompat
+import com.looker.droidify.utility.common.Constants.NOTIFICATION_CHANNEL_INSTALL
+import com.looker.droidify.utility.common.Constants.NOTIFICATION_ID_INSTALL
+import com.looker.droidify.installer.model.InstallState
+import com.looker.droidify.R
+
+fun NotificationManager.installNotification(
+    packageName: String,
+    notification: Notification,
+) {
+    notify(
+        installTag(packageName),
+        NOTIFICATION_ID_INSTALL,
+        notification
+    )
+}
+
+fun NotificationManager.removeInstallNotification(
+    packageName: String,
+) {
+    cancel(installTag(packageName), NOTIFICATION_ID_INSTALL)
+}
+
+fun installTag(name: String): String = "install-${name.trim().replace(' ', '_')}"
+
+private const val SUCCESS_TIMEOUT = 5_000L
+
+fun Context.createInstallNotification(
+    appName: String,
+    state: InstallState,
+    isUninstall: Boolean = false,
+    autoCancel: Boolean = true,
+    block: NotificationCompat.Builder.() -> Unit = {},
+): Notification {
+    return NotificationCompat
+        .Builder(this, NOTIFICATION_CHANNEL_INSTALL)
+        .apply {
+            setAutoCancel(autoCancel)
+            setOngoing(false)
+            setOnlyAlertOnce(true)
+            setColor(Color.GREEN)
+            val (title, text) = if (isUninstall) {
+                setTimeoutAfter(SUCCESS_TIMEOUT)
+                setSmallIcon(R.drawable.ic_delete)
+                getString(R.string.uninstalled_application) to
+                    getString(R.string.uninstalled_application_DESC, appName)
+            } else {
+                when (state) {
+                    InstallState.Failed -> {
+                        setSmallIcon(R.drawable.ic_bug_report)
+                        getString(R.string.installation_failed) to
+                            getString(R.string.installation_failed_DESC, appName)
+                    }
+
+                    InstallState.Pending -> {
+                        setSmallIcon(R.drawable.ic_download)
+                        getString(R.string.downloaded_FORMAT, appName) to
+                            getString(R.string.tap_to_install_DESC)
+                    }
+
+                    InstallState.Installing -> {
+                        setSmallIcon(R.drawable.ic_download)
+                        setProgress(-1, -1, true)
+                        getString(R.string.installing) to
+                            appName
+                    }
+
+                    InstallState.Installed -> {
+                        setTimeoutAfter(SUCCESS_TIMEOUT)
+                        setSmallIcon(R.drawable.ic_check)
+                        getString(R.string.installed) to
+                            appName
+                    }
+                }
+            }
+            setContentTitle(title)
+            setContentText(text)
+            block()
+        }
+        .build()
+}

app/src/main/kotlin/com/looker/droidify/model/InstalledItem.kt

@@ -0,0 +1,8 @@
+package com.looker.droidify.model
+
+class InstalledItem(
+    val packageName: String,
+    val version: String,
+    val versionCode: Long,
+    val signature: String
+)

app/src/main/kotlin/com/looker/droidify/model/Product.kt

@@ -0,0 +1,128 @@
+package com.looker.droidify.model
+
+import android.content.Context
+import com.looker.droidify.utility.common.extension.getColorFromAttr
+import com.looker.droidify.utility.common.extension.videoPlaceHolder
+import com.google.android.material.R as MaterialR
+
+data class Product(
+    var repositoryId: Long,
+    val packageName: String,
+    val name: String,
+    val summary: String,
+    var description: String,
+    val whatsNew: String,
+    val icon: String,
+    val metadataIcon: String,
+    val author: Author,
+    val source: String,
+    val changelog: String,
+    val web: String,
+    val tracker: String,
+    val added: Long,
+    val updated: Long,
+    val suggestedVersionCode: Long,
+    val categories: List<String>,
+    val antiFeatures: List<String>,
+    val licenses: List<String>,
+    val donates: List<Donate>,
+    val screenshots: List<Screenshot>,
+    val releases: List<Release>
+) {
+    data class Author(val name: String, val email: String, val web: String)
+
+    sealed class Donate {
+        data class Regular(val url: String) : Donate()
+        data class Bitcoin(val address: String) : Donate()
+        data class Litecoin(val address: String) : Donate()
+        data class Liberapay(val id: String) : Donate()
+        data class OpenCollective(val id: String) : Donate()
+    }
+
+    class Screenshot(val locale: String, val type: Type, val path: String) {
+        enum class Type(val jsonName: String) {
+            VIDEO("video"),
+            PHONE("phone"),
+            SMALL_TABLET("smallTablet"),
+            LARGE_TABLET("largeTablet"),
+            WEAR("wear"),
+            TV("tv")
+        }
+
+        val identifier: String
+            get() = "$locale.${type.name}.$path"
+
+        fun url(
+            context: Context,
+            repository: Repository,
+            packageName: String
+        ): Any {
+            if (type == Type.VIDEO) return context.videoPlaceHolder.apply {
+                setTintList(context.getColorFromAttr(MaterialR.attr.colorOnSurfaceInverse))
+            }
+            val phoneType = when (type) {
+                Type.PHONE -> "phoneScreenshots"
+                Type.SMALL_TABLET -> "sevenInchScreenshots"
+                Type.LARGE_TABLET -> "tenInchScreenshots"
+                Type.WEAR -> "wearScreenshots"
+                Type.TV -> "tvScreenshots"
+                else -> error("Should not be here, video url already returned")
+            }
+            return "${repository.address}/$packageName/$locale/$phoneType/$path"
+        }
+    }
+
+    // Same releases with different signatures
+    val selectedReleases: List<Release>
+        get() = releases.filter { it.selected }
+
+    val displayRelease: Release?
+        get() = selectedReleases.firstOrNull() ?: releases.firstOrNull()
+
+    val version: String
+        get() = displayRelease?.version.orEmpty()
+
+    val versionCode: Long
+        get() = selectedReleases.firstOrNull()?.versionCode ?: 0L
+
+    val compatible: Boolean
+        get() = selectedReleases.firstOrNull()?.incompatibilities?.isEmpty() == true
+
+    val signatures: List<String>
+        get() = selectedReleases.mapNotNull { it.signature.ifBlank { null } }.distinct().toList()
+
+    fun item(): ProductItem {
+        return ProductItem(
+            repositoryId,
+            packageName,
+            name,
+            summary,
+            icon,
+            metadataIcon,
+            version,
+            "",
+            compatible,
+            false,
+            0
+        )
+    }
+
+    fun canUpdate(installedItem: InstalledItem?): Boolean {
+        return installedItem != null && compatible && versionCode > installedItem.versionCode &&
+            installedItem.signature in signatures
+    }
+}
+
+fun List<Pair<Product, Repository>>.findSuggested(
+    installedItem: InstalledItem?
+): Pair<Product, Repository>? = maxWithOrNull(
+    compareBy(
+        { (product, _) ->
+            product.compatible &&
+                (installedItem == null || installedItem.signature in product.signatures)
+        },
+        { (product, _) ->
+            product.versionCode
+        }
+    )
+)

app/src/main/kotlin/com/looker/droidify/model/ProductItem.kt

@@ -0,0 +1,56 @@
+package com.looker.droidify.model
+
+import android.os.Parcelable
+import android.view.View
+import com.looker.droidify.utility.common.extension.dpi
+import kotlinx.parcelize.Parcelize
+
+data class ProductItem(
+    var repositoryId: Long,
+    var packageName: String,
+    var name: String,
+    var summary: String,
+    val icon: String,
+    val metadataIcon: String,
+    val version: String,
+    var installedVersion: String,
+    var compatible: Boolean,
+    var canUpdate: Boolean,
+    var matchRank: Int
+) {
+    sealed interface Section : Parcelable {
+
+        @Parcelize
+        object All : Section
+
+        @Parcelize
+        class Category(val name: String) : Section
+
+        @Parcelize
+        class Repository(val id: Long, val name: String) : Section
+    }
+
+    private val supportedDpi = intArrayOf(120, 160, 240, 320, 480, 640)
+    private var deviceDpi: Int = -1
+
+    fun icon(
+        view: View,
+        repository: Repository
+    ): String? {
+        if (packageName.isBlank()) return null
+        if (icon.isBlank() && metadataIcon.isBlank()) return null
+        if (repository.version < 11 && icon.isNotBlank()) {
+            return "${repository.address}/icons/$icon"
+        }
+        if (icon.isNotBlank()) {
+            if (deviceDpi == -1) {
+                deviceDpi = supportedDpi.find { it >= view.dpi } ?: supportedDpi.last()
+            }
+            return "${repository.address}/icons-$deviceDpi/$icon"
+        }
+        if (metadataIcon.isNotBlank()) {
+            return "${repository.address}/$packageName/$metadataIcon"
+        }
+        return null
+    }
+}

app/src/main/kotlin/com/looker/droidify/model/ProductPreference.kt

@@ -0,0 +1,7 @@
+package com.looker.droidify.model
+
+data class ProductPreference(val ignoreUpdates: Boolean, val ignoreVersionCode: Long) {
+    fun shouldIgnoreUpdate(versionCode: Long): Boolean {
+        return ignoreUpdates || ignoreVersionCode == versionCode
+    }
+}

app/src/main/kotlin/com/looker/droidify/model/Release.kt

@@ -0,0 +1,46 @@
+package com.looker.droidify.model
+
+import android.net.Uri
+
+data class Release(
+    val selected: Boolean,
+    val version: String,
+    val versionCode: Long,
+    val added: Long,
+    val size: Long,
+    val minSdkVersion: Int,
+    val targetSdkVersion: Int,
+    val maxSdkVersion: Int,
+    val source: String,
+    val release: String,
+    val hash: String,
+    val hashType: String,
+    val signature: String,
+    val obbMain: String,
+    val obbMainHash: String,
+    val obbMainHashType: String,
+    val obbPatch: String,
+    val obbPatchHash: String,
+    val obbPatchHashType: String,
+    val permissions: List<String>,
+    val features: List<String>,
+    val platforms: List<String>,
+    val incompatibilities: List<Incompatibility>
+) {
+    sealed class Incompatibility {
+        object MinSdk : Incompatibility()
+        object MaxSdk : Incompatibility()
+        object Platform : Incompatibility()
+        class Feature(val feature: String) : Incompatibility()
+    }
+
+    val identifier: String
+        get() = "$versionCode.$hash"
+
+    fun getDownloadUrl(repository: Repository): String {
+        return Uri.parse(repository.address).buildUpon().appendPath(release).build().toString()
+    }
+
+    val cacheFileName: String
+        get() = "${hash.replace('/', '-')}.apk"
+}

app/src/main/kotlin/com/looker/droidify/model/Repository.kt

@@ -0,0 +1,417 @@
+package com.looker.droidify.model
+
+import java.net.URL
+
+data class Repository(
+    var id: Long,
+    val address: String,
+    val mirrors: List<String>,
+    val name: String,
+    val description: String,
+    val version: Int,
+    val enabled: Boolean,
+    val fingerprint: String,
+    val lastModified: String,
+    val entityTag: String,
+    val updated: Long,
+    val timestamp: Long,
+    val authentication: String,
+) {
+
+    fun edit(address: String, fingerprint: String, authentication: String): Repository {
+        val isAddressChanged = this.address != address
+        val isFingerprintChanged = this.fingerprint != fingerprint
+        val shouldForceUpdate = isAddressChanged || isFingerprintChanged
+        return copy(
+            address = address,
+            fingerprint = fingerprint,
+            lastModified = if (shouldForceUpdate) "" else lastModified,
+            entityTag = if (shouldForceUpdate) "" else entityTag,
+            authentication = authentication
+        )
+    }
+
+    fun update(
+        mirrors: List<String>,
+        name: String,
+        description: String,
+        version: Int,
+        lastModified: String,
+        entityTag: String,
+        timestamp: Long,
+    ): Repository {
+        return copy(
+            mirrors = mirrors,
+            name = name,
+            description = description,
+            version = if (version >= 0) version else this.version,
+            lastModified = lastModified,
+            entityTag = entityTag,
+            updated = System.currentTimeMillis(),
+            timestamp = timestamp
+        )
+    }
+
+    fun enable(enabled: Boolean): Repository {
+        return copy(enabled = enabled, lastModified = "", entityTag = "")
+    }
+
+    @Suppress("SpellCheckingInspection")
+    companion object {
+
+        fun newRepository(
+            address: String,
+            fingerprint: String,
+            authentication: String,
+        ): Repository {
+            val name = try {
+                URL(address).let { "${it.host}${it.path}" }
+            } catch (e: Exception) {
+                address
+            }
+            return defaultRepository(address, name, "", 0, true, fingerprint, authentication)
+        }
+
+        private fun defaultRepository(
+            address: String,
+            name: String,
+            description: String,
+            version: Int = 21,
+            enabled: Boolean = false,
+            fingerprint: String,
+            authentication: String = "",
+        ): Repository {
+            return Repository(
+                -1, address, emptyList(), name, description, version, enabled,
+                fingerprint, "", "", 0L, 0L, authentication
+            )
+        }
+
+        val defaultRepositories = listOf(
+            defaultRepository(
+                address = "https://f-droid.org/repo",
+                name = "F-Droid",
+                description = "The official F-Droid Free Software repos" +
+                    "itory. Everything in this repository is always buil" +
+                    "t from the source code.",
+                enabled = true,
+                fingerprint = "43238D512C1E5EB2D6569F4A3AFBF5523418B82E0A3ED1552770ABB9A9C9CCAB"
+            ),
+            defaultRepository(
+                address = "https://f-droid.org/archive",
+                name = "F-Droid Archive",
+                description = "The archive of the official F-Droid Free" +
+                    " Software repository. Apps here are old and can co" +
+                    "ntain known vulnerabilities and security issues!",
+                fingerprint = "43238D512C1E5EB2D6569F4A3AFBF5523418B82E0A3ED1552770ABB9A9C9CCAB"
+            ),
+            defaultRepository(
+                address = "https://guardianproject.info/fdroid/repo",
+                name = "Guardian Project Official Releases",
+                description = "The official repository of The Guardian " +
+                    "Project apps for use with the F-Droid client. Appl" +
+                    "ications in this repository are official binaries " +
+                    "built by the original application developers and " +
+                    "signed by the same key as the APKs that are relea" +
+                    "sed in the Google Play Store.",
+                fingerprint = "B7C2EEFD8DAC7806AF67DFCD92EB18126BC08312A7F2D6F3862E46013C7A6135"
+            ),
+            defaultRepository(
+                address = "https://guardianproject.info/fdroid/archive",
+                name = "Guardian Project Archive",
+                description = "The official repository of The Guardian Pr" +
+                    "oject apps for use with the F-Droid client. This con" +
+                    "tains older versions of applications from the main repository.",
+                fingerprint = "B7C2EEFD8DAC7806AF67DFCD92EB18126BC08312A7F2D6F3862E46013C7A6135"
+            ),
+            defaultRepository(
+                address = "https://apt.izzysoft.de/fdroid/repo",
+                name = "IzzyOnDroid F-Droid Repo",
+                description = "This is a repository of apps to be used with" +
+                    " F-Droid the original application developers, taken" +
+                    " from the resp. repositories (mostly GitHub). At thi" +
+                    "s moment I cannot give guarantees on regular updates" +
+                    " for all of them, though most are checked multiple times a week ",
+                enabled = true,
+                fingerprint = "3BF0D6ABFEAE2F401707B6D966BE743BF0EEE49C2561B9BA39073711F628937A"
+            ),
+            defaultRepository(
+                address = "https://microg.org/fdroid/repo",
+                name = "MicroG Project",
+                description = "The official repository for MicroG." +
+                    " MicroG is a lightweight open-source implementation" +
+                    " of Google Play Services.",
+                fingerprint = "9BD06727E62796C0130EB6DAB39B73157451582CBD138E86C468ACC395D14165"
+            ),
+            defaultRepository(
+                address = "https://repo.netsyms.com/fdroid/repo",
+                name = "Netsyms Technologies",
+                description = "Official collection of open-source apps created" +
+                    " by Netsyms Technologies.",
+                fingerprint = "2581BA7B32D3AB443180C4087CAB6A7E8FB258D3A6E98870ECB3C675E4D64489"
+            ),
+            defaultRepository(
+                address = "https://molly.im/fdroid/foss/fdroid/repo",
+                name = "Molly",
+                description = "The official repository for Molly. " +
+                    "Molly is a fork of Signal focused on security.",
+                fingerprint = "5198DAEF37FC23C14D5EE32305B2AF45787BD7DF2034DE33AD302BDB3446DF74"
+            ),
+            defaultRepository(
+                address = "https://archive.newpipe.net/fdroid/repo",
+                name = "NewPipe",
+                description = "The official repository for NewPipe." +
+                    " NewPipe is a lightweight client for Youtube, PeerTube" +
+                    ", Soundcloud, etc.",
+                fingerprint = "E2402C78F9B97C6C89E97DB914A2751FDA1D02FE2039CC0897A462BDB57E7501"
+            ),
+            defaultRepository(
+                address = "https://www.collaboraoffice.com/downloads/fdroid/repo",
+                name = "Collabora Office",
+                description = "Collabora Office is an office suite based on LibreOffice.",
+                fingerprint = "573258C84E149B5F4D9299E7434B2B69A8410372921D4AE586BA91EC767892CC"
+            ),
+            defaultRepository(
+                address = "https://fdroid.libretro.com/repo",
+                name = "LibRetro",
+                description = "The official canary repository for this great" +
+                    " retro emulators hub.",
+                fingerprint = "3F05B24D497515F31FEAB421297C79B19552C5C81186B3750B7C131EF41D733D"
+            ),
+            defaultRepository(
+                address = "https://cdn.kde.org/android/fdroid/repo",
+                name = "KDE Android",
+                description = "The official nightly repository for KDE Android apps.",
+                fingerprint = "B3EBE10AFA6C5C400379B34473E843D686C61AE6AD33F423C98AF903F056523F"
+            ),
+            defaultRepository(
+                address = "https://calyxos.gitlab.io/calyx-fdroid-repo/fdroid/repo",
+                name = "Calyx OS Repo",
+                description = "The official Calyx Labs F-Droid repository.",
+                fingerprint = "C44D58B4547DE5096138CB0B34A1CC99DAB3B4274412ED753FCCBFC11DC1B7B6"
+            ),
+            defaultRepository(
+                address = "https://divestos.org/fdroid/official",
+                name = "Divest OS Repo",
+                description = "The official Divest OS F-Droid repository.",
+                fingerprint = "E4BE8D6ABFA4D9D4FEEF03CDDA7FF62A73FD64B75566F6DD4E5E577550BE8467"
+            ),
+            defaultRepository(
+                address = "https://fdroid.fedilab.app/repo",
+                name = "Fedilab",
+                description = "The official repository for Fedilab. Fedilab is a " +
+                    "multi-accounts client for Mastodon, Peertube, and other free" +
+                    " software social networks.",
+                fingerprint = "11F0A69910A4280E2CD3CCC3146337D006BE539B18E1A9FEACE15FF757A94FEB"
+            ),
+            defaultRepository(
+                address = "https://store.nethunter.com/repo",
+                name = "Kali Nethunter",
+                description = "Kali Nethunter's official selection of original b" +
+                    "inaries.",
+                fingerprint = "7E418D34C3AD4F3C37D7E6B0FACE13332364459C862134EB099A3BDA2CCF4494"
+            ),
+            defaultRepository(
+                address = "https://secfirst.org/fdroid/repo",
+                name = "Umbrella",
+                description = "The official repository for Umbrella. Umbrella is" +
+                    " a collection of security advices, tutorials, tools etc.",
+                fingerprint = "39EB57052F8D684514176819D1645F6A0A7BD943DBC31AB101949006AC0BC228"
+            ),
+            defaultRepository(
+                address = "https://thecapslock.gitlab.io/fdroid-patched-apps/fdroid/repo",
+                name = "Patched Apps",
+                description = "A collection of patched applications to provid" +
+                    "e better compatibility, privacy etc..",
+                fingerprint = "313D9E6E789FF4E8E2D687AAE31EEF576050003ED67963301821AC6D3763E3AC"
+            ),
+            defaultRepository(
+                address = "https://mobileapp.bitwarden.com/fdroid/repo",
+                name = "Bitwarden",
+                description = "The official repository for Bitwarden. Bitward" +
+                    "en is a password manager.",
+                fingerprint = "BC54EA6FD1CD5175BCCCC47C561C5726E1C3ED7E686B6DB4B18BAC843A3EFE6C"
+            ),
+            defaultRepository(
+                address = "https://briarproject.org/fdroid/repo",
+                name = "Briar",
+                description = "The official repository for Briar. Briar is a" +
+                    " serverless/offline messenger that focused on privacy, s" +
+                    "ecurity, and decentralization.",
+                fingerprint = "1FB874BEE7276D28ECB2C9B06E8A122EC4BCB4008161436CE474C257CBF49BD6"
+            ),
+            defaultRepository(
+                address = "https://guardianproject-wind.s3.amazonaws.com/fdroid/repo",
+                name = "Wind Project",
+                description = "A collection of interesting offline/serverless apps.",
+                fingerprint = "182CF464D219D340DA443C62155198E399FEC1BC4379309B775DD9FC97ED97E1"
+            ),
+            defaultRepository(
+                address = "https://nanolx.org/fdroid/repo",
+                name = "NanoDroid",
+                description = "A companion repository to microG's installer.",
+                fingerprint = "862ED9F13A3981432BF86FE93D14596B381D75BE83A1D616E2D44A12654AD015"
+            ),
+            defaultRepository(
+                address = "https://releases.threema.ch/fdroid/repo",
+                name = "Threema Libre",
+                description = "The official repository for Threema Libre. R" +
+                    "equires Threema Shop license. Threema Libre is an open" +
+                    "-source messanger focused on security and privacy.",
+                fingerprint = "5734E753899B25775D90FE85362A49866E05AC4F83C05BEF5A92880D2910639E"
+            ),
+            defaultRepository(
+                address = "https://fdroid.getsession.org/fdroid/repo",
+                name = "Session",
+                description = "The official repository for Session. Session" +
+                    " is an open-source messanger focused on security and privacy.",
+                fingerprint = "DB0E5297EB65CC22D6BD93C869943BDCFCB6A07DC69A48A0DD8C7BA698EC04E6"
+            ),
+            defaultRepository(
+                address = "https://www.cromite.org/fdroid/repo",
+                name = "Cromite",
+                description = "The official repository for Cromite. Cromite" +
+                    " is a Chromium with ad blocking and enhanced privacy.",
+                fingerprint = "49F37E74DEE483DCA2B991334FB5A0200787430D0B5F9A783DD5F13695E9517B"
+            ),
+            defaultRepository(
+                address = "https://fdroid.twinhelix.com/fdroid/repo",
+                name = "TwinHelix",
+                description = "TwinHelix F-Droid Repository, used for Signa" +
+                    "l-FOSS, an open-source fork of Signal Private Messenger.",
+                fingerprint = "7b03b0232209b21b10a30a63897d3c6bca4f58fe29bc3477e8e3d8cf8e304028"
+            ),
+            defaultRepository(
+                address = "https://fdroid.typeblog.net",
+                name = "PeterCxy's F-Droid",
+                description = "You have landed on PeterCxy's F-Droid repo. T" +
+                    "o use this repository, please add the page's URL to your F-Droid client.",
+                fingerprint = "1a7e446c491c80bc2f83844a26387887990f97f2f379ae7b109679feae3dbc8c"
+            ),
+            defaultRepository(
+                address = "https://s2.spiritcroc.de/fdroid/repo",
+                name = "SpiritCroc.de",
+                description = "While some of my apps are available from" +
+                    " the official F-Droid repository, I also maintain my" +
+                    " own repository for a small selection of apps. These" +
+                    " might be forks of other apps with only minor change" +
+                    "s, or apps that are not published on the Play Store f" +
+                    "or other reasons. In contrast to the official F-Droid" +
+                    " repos, these might also include proprietary librarie" +
+                    "s, e.g. for push notifications.",
+                fingerprint = "6612ade7e93174a589cf5ba26ed3ab28231a789640546c8f30375ef045bc9242"
+            ),
+            defaultRepository(
+                address = "https://s2.spiritcroc.de/testing/fdroid/repo",
+                name = "SpiritCroc.de Test Builds",
+                description = "SpiritCroc.de Test Builds",
+                fingerprint = "52d03f2fab785573bb295c7ab270695e3a1bdd2adc6a6de8713250b33f231225"
+            ),
+            defaultRepository(
+                address = "https://static.cryptomator.org/android/fdroid/repo",
+                name = "Cryptomator",
+                description = "No Description",
+                fingerprint = "f7c3ec3b0d588d3cb52983e9eb1a7421c93d4339a286398e71d7b651e8d8ecdd"
+            ),
+            defaultRepository(
+                address = "https://divestos.org/apks/unofficial/fdroid/repo",
+                name = "DivestOS Unofficial",
+                description = "This repository contains unofficial builds of open source apps" +
+                    " that are not included in the other repos.",
+                fingerprint = "a18cdb92f40ebfbbf778a54fd12dbd74d90f1490cb9ef2cc6c7e682dd556855d"
+            ),
+            defaultRepository(
+                address = "https://cdn.kde.org/android/stable-releases/fdroid/repo",
+                name = "KDE Stables",
+                description = "This repository contains unofficial builds of open source apps" +
+                    " that are not included in the other repos.",
+                fingerprint = "13784ba6c80ff4e2181e55c56f961eed5844cea16870d3b38d58780b85e1158f"
+            ),
+            defaultRepository(
+                address = "https://zimbelstern.eu/fdroid/repo",
+                name = "Zimbelstern's F-Droid repository",
+                description = "This is the official repository of apps from zimbelstern.eu," +
+                    " to be used with F-Droid.",
+                fingerprint = "285158DECEF37CB8DE7C5AF14818ACBF4A9B1FBE63116758EFC267F971CA23AA"
+            ),
+            defaultRepository(
+                address = "https://app.simplex.chat/fdroid/repo",
+                name = "SimpleX Chat F-Droid",
+                description = "SimpleX Chat official F-Droid repository.",
+                fingerprint = "9F358FF284D1F71656A2BFAF0E005DEAE6AA14143720E089F11FF2DDCFEB01BA"
+            ),
+            defaultRepository(
+                address = "https://f-droid.monerujo.io/fdroid/repo",
+                name = "Monerujo Wallet",
+                description = "Monerujo Monero Wallet official F-Droid repository.",
+                fingerprint = "A82C68E14AF0AA6A2EC20E6B272EFF25E5A038F3F65884316E0F5E0D91E7B713"
+            ),
+            defaultRepository(
+                address = "https://fdroid.cakelabs.com/fdroid/repo",
+                name = "Cake Labs",
+                description = "Cake Labs official F-Droid repository for Cake Wallet and Monero.com",
+                fingerprint = "EA44EFAEE0B641EE7A032D397D5D976F9C4E5E1ED26E11C75702D064E55F8755"
+            ),
+            defaultRepository(
+                address = "https://app.futo.org/fdroid/repo",
+                name = "FUTO",
+                description = "FUTO official F-Droid repository.",
+                fingerprint = "39D47869D29CBFCE4691D9F7E6946A7B6D7E6FF4883497E6E675744ECDFA6D6D"
+            ),
+            defaultRepository(
+                address = "https://fdroid.mm20.de/repo",
+                name = "MM20 Apps",
+                description = "Apps developed and distributed by MM20",
+                fingerprint = "156FBAB952F6996415F198F3F29628D24B30E725B0F07A2B49C3A9B5161EEE1A"
+            ),
+            defaultRepository(
+                address = "https://breezy-weather.github.io/fdroid-repo/fdroid/repo",
+                name = "Breezy Weather",
+                description = "The F-Droid repository for Breezy Weather",
+                fingerprint = "3480A7BB2A296D8F98CB90D2309199B5B9519C1B31978DBCD877ADB102AF35EE"
+            ),
+            defaultRepository(
+                address = "https://gh.artemchep.com/keyguard-repo-fdroid/repo",
+                name = "Keyguard Project",
+                description = "Mirrors artifacts available on https://github.com/AChep/keyguard-app/releases",
+                fingerprint = "03941CE79B081666609C8A48AB6E46774263F6FC0BBF1FA046CCFFC60EA643BC"
+            ),
+            defaultRepository(
+                address = "https://f5a.torus.icu/fdroid/repo",
+                name = "Fcitx 5 For Android F-Droid Repo",
+                description = "Out-of-tree fcitx5-android plugins.",
+                fingerprint = "5D87CE1FAD3772425C2A7ED987A57595A20B07543B9595A7FD2CED25DFF3CF12"
+            ),
+            defaultRepository(
+                address = "https://fdroid.i2pd.xyz/fdroid/repo/",
+                name = "PurpleI2P F-Droid repository",
+                description = "This is a repository of PurpleI2P. It contains applications developed and supported by our team.",
+                fingerprint = "5D87CE1FAD3772425C2A7ED987A57595A20B07543B9595A7FD2CED25DFF3CF12"
+            ),
+        )
+
+        val newlyAdded: List<Repository> = listOf(
+            defaultRepository(
+                address = "https://fdroid.ironfoxoss.org/fdroid/repo",
+                name = "IronFox",
+                description = "The official repository for IronFox:" +
+                    " A privacy and security-oriented Firefox-based browser for Android.",
+                fingerprint = "C5E291B5A571F9C8CD9A9799C2C94E02EC9703948893F2CA756D67B94204F904"
+            ),
+            defaultRepository(
+                address = "https://raw.githubusercontent.com/chrisgch/tca/master/fdroid/repo",
+                name = "Total Commander",
+                description = "The official repository for Total Commander",
+                fingerprint = "3576596CECDD70488D61CFD90799A49B7FFD26A81A8FEF1BADEC88D069FA72C1"
+            ),
+            defaultRepository(
+                address = "https://www.cromite.org/fdroid/repo",
+                name = "Cromite",
+                description = "The official repository for Cromite. " +
+                    "Cromite is a Chromium fork based on Bromite with " +
+                    "built-in support for ad blocking and an eye for privacy.",
+                fingerprint = "49F37E74DEE483DCA2B991334FB5A0200787430D0B5F9A783DD5F13695E9517B"
+            )
+        )
+    }
+}

app/src/main/kotlin/com/looker/droidify/network/DataSize.kt

@@ -0,0 +1,30 @@
+package com.looker.droidify.network
+
+import java.util.Locale
+
+@JvmInline
+value class DataSize(val value: Long) {
+
+    companion object {
+        private const val BYTE_SIZE = 1024L
+        private val sizeFormats = listOf("%.0f B", "%.0f kB", "%.1f MB", "%.2f GB")
+    }
+
+    override fun toString(): String {
+        val (size, index) = generateSequence(Pair(value.toFloat(), 0)) { (size, index) ->
+            if (size >= BYTE_SIZE) {
+                Pair(size / BYTE_SIZE, index + 1)
+            } else {
+                null
+            }
+        }.take(sizeFormats.size).last()
+        return sizeFormats[index].format(Locale.US, size)
+    }
+}
+
+infix fun DataSize.percentBy(denominator: DataSize?): Int = value percentBy denominator?.value
+
+infix fun Long.percentBy(denominator: Long?): Int {
+    if (denominator == null || denominator < 1) return -1
+    return (this * 100 / denominator).toInt()
+}

app/src/main/kotlin/com/looker/droidify/network/Downloader.kt

@@ -0,0 +1,26 @@
+package com.looker.droidify.network
+
+import com.looker.droidify.network.header.HeadersBuilder
+import com.looker.droidify.network.validation.FileValidator
+import java.io.File
+import java.net.Proxy
+
+interface Downloader {
+
+    fun setProxy(proxy: Proxy)
+
+    suspend fun headCall(
+        url: String,
+        headers: HeadersBuilder.() -> Unit = {}
+    ): NetworkResponse
+
+    suspend fun downloadToFile(
+        url: String,
+        target: File,
+        validator: FileValidator? = null,
+        headers: HeadersBuilder.() -> Unit = {},
+        block: ProgressListener? = null
+    ): NetworkResponse
+}
+
+typealias ProgressListener = suspend (bytesReceived: DataSize, contentLength: DataSize) -> Unit

app/src/main/kotlin/com/looker/droidify/network/KtorDownloader.kt

@@ -0,0 +1,153 @@
+package com.looker.droidify.network
+
+import com.looker.droidify.BuildConfig
+import com.looker.droidify.network.header.HeadersBuilder
+import com.looker.droidify.network.header.KtorHeadersBuilder
+import com.looker.droidify.network.validation.FileValidator
+import com.looker.droidify.network.validation.ValidationException
+import com.looker.droidify.utility.common.extension.size
+import io.ktor.client.HttpClient
+import io.ktor.client.HttpClientConfig
+import io.ktor.client.engine.HttpClientEngine
+import io.ktor.client.engine.okhttp.OkHttp
+import io.ktor.client.network.sockets.ConnectTimeoutException
+import io.ktor.client.network.sockets.SocketTimeoutException
+import io.ktor.client.plugins.HttpTimeout
+import io.ktor.client.plugins.UserAgent
+import io.ktor.client.plugins.onDownload
+import io.ktor.client.request.head
+import io.ktor.client.request.headers
+import io.ktor.client.request.prepareGet
+import io.ktor.client.request.request
+import io.ktor.client.request.url
+import io.ktor.client.statement.HttpResponse
+import io.ktor.client.statement.bodyAsChannel
+import io.ktor.http.HttpStatusCode
+import io.ktor.http.etag
+import io.ktor.http.isSuccess
+import io.ktor.http.lastModified
+import io.ktor.utils.io.jvm.javaio.copyTo
+import kotlinx.coroutines.CoroutineDispatcher
+import kotlinx.coroutines.withContext
+import java.io.File
+import java.io.IOException
+import java.net.Proxy
+import kotlin.coroutines.cancellation.CancellationException
+
+internal class KtorDownloader(
+    httpClientEngine: HttpClientEngine,
+    private val dispatcher: CoroutineDispatcher,
+) : Downloader {
+
+    private var client = client(httpClientEngine)
+        set(newClient) {
+            field.close()
+            field = newClient
+        }
+
+    override fun setProxy(proxy: Proxy) {
+        client = client(OkHttp.create { this.proxy = proxy })
+    }
+
+    override suspend fun headCall(
+        url: String,
+        headers: HeadersBuilder.() -> Unit
+    ): NetworkResponse {
+        val headRequest = createRequest(
+            url = url,
+            headers = headers
+        )
+        return client.head(headRequest).asNetworkResponse()
+    }
+
+    override suspend fun downloadToFile(
+        url: String,
+        target: File,
+        validator: FileValidator?,
+        headers: HeadersBuilder.() -> Unit,
+        block: ProgressListener?
+    ): NetworkResponse = withContext(dispatcher) {
+        try {
+            val request = createRequest(
+                url = url,
+                headers = {
+                    inRange(target.size)
+                    headers()
+                },
+                fileSize = target.size,
+                block = block
+            )
+            client.prepareGet(request).execute { response ->
+                val networkResponse = response.asNetworkResponse()
+                if (networkResponse !is NetworkResponse.Success) {
+                    return@execute networkResponse
+                }
+                response.bodyAsChannel().copyTo(target.outputStream())
+                validator?.validate(target)
+                networkResponse
+            }
+        } catch (e: SocketTimeoutException) {
+            NetworkResponse.Error.SocketTimeout(e)
+        } catch (e: ConnectTimeoutException) {
+            NetworkResponse.Error.ConnectionTimeout(e)
+        } catch (e: IOException) {
+            NetworkResponse.Error.IO(e)
+        } catch (e: ValidationException) {
+            target.delete()
+            NetworkResponse.Error.Validation(e)
+        } catch (e: Exception) {
+            if (e is CancellationException) throw e
+            NetworkResponse.Error.Unknown(e)
+        }
+    }
+
+    private fun client(
+        engine: HttpClientEngine = OkHttp.create()
+    ): HttpClient {
+        return HttpClient(engine) {
+            userAgentConfig()
+            timeoutConfig()
+        }
+    }
+
+
+    private fun createRequest(
+        url: String,
+        headers: HeadersBuilder.() -> Unit,
+        fileSize: Long? = null,
+        block: ProgressListener? = null
+    ) = request {
+        url(url)
+        this.headers {
+            KtorHeadersBuilder(this).headers()
+        }
+        onDownload { read, total ->
+            if (block != null) {
+                block(
+                    DataSize(read + (fileSize ?: 0L)),
+                    DataSize((total ?: 0L) + (fileSize ?: 0L))
+                )
+            }
+        }
+    }
+}
+
+private const val CONNECTION_TIMEOUT = 30_000L
+private const val SOCKET_TIMEOUT = 15_000L
+private const val USER_AGENT = "Droid-ify/${BuildConfig.VERSION_NAME}-${BuildConfig.BUILD_TYPE}"
+
+private fun HttpClientConfig<*>.userAgentConfig() = install(UserAgent) {
+    agent = USER_AGENT
+}
+
+private fun HttpClientConfig<*>.timeoutConfig() = install(HttpTimeout) {
+    connectTimeoutMillis = CONNECTION_TIMEOUT
+    socketTimeoutMillis = SOCKET_TIMEOUT
+}
+
+private fun HttpResponse.asNetworkResponse(): NetworkResponse =
+    if (status.isSuccess() || status == HttpStatusCode.NotModified) {
+        NetworkResponse.Success(status.value, lastModified(), etag())
+    } else {
+        NetworkResponse.Error.Http(status.value)
+    }

app/src/main/kotlin/com/looker/droidify/network/NetworkResponse.kt

@@ -0,0 +1,28 @@
+package com.looker.droidify.network
+
+import com.looker.droidify.network.validation.ValidationException
+import java.util.Date
+
+sealed interface NetworkResponse {
+
+    sealed interface Error : NetworkResponse {
+
+        data class ConnectionTimeout(val exception: Exception) : Error
+
+        data class SocketTimeout(val exception: Exception) : Error
+
+        data class IO(val exception: Exception) : Error
+
+        data class Validation(val exception: ValidationException) : Error
+
+        data class Unknown(val exception: Exception) : Error
+
+        data class Http(val statusCode: Int) : Error
+    }
+
+    data class Success(
+        val statusCode: Int,
+        val lastModified: Date?,
+        val etag: String?
+    ) : NetworkResponse
+}

app/src/main/kotlin/com/looker/droidify/network/header/HeadersBuilder.kt

@@ -0,0 +1,20 @@
+package com.looker.droidify.network.header
+
+import java.util.Date
+
+interface HeadersBuilder {
+
+    infix fun String.headsWith(value: Any?)
+
+    fun etag(etagString: String)
+
+    fun ifModifiedSince(date: Date)
+
+    fun ifModifiedSince(date: String)
+
+    fun authentication(username: String, password: String)
+
+    fun authentication(base64: String)
+
+    fun inRange(start: Number?, end: Number? = null)
+}

app/src/main/kotlin/com/looker/droidify/network/header/KtorHeadersBuilder.kt

@@ -0,0 +1,55 @@
+package com.looker.droidify.network.header
+
+import io.ktor.http.HttpHeaders
+import io.ktor.util.encodeBase64
+import java.text.SimpleDateFormat
+import java.util.Date
+import java.util.Locale
+import java.util.TimeZone
+
+internal class KtorHeadersBuilder(
+    private val builder: io.ktor.http.HeadersBuilder
+) : HeadersBuilder {
+
+    override fun String.headsWith(value: Any?) {
+        if (value == null) return
+        with(builder) {
+            append(this@headsWith, value.toString())
+        }
+    }
+
+    override fun etag(etagString: String) {
+        HttpHeaders.ETag headsWith etagString
+    }
+
+    override fun ifModifiedSince(date: Date) {
+        HttpHeaders.IfModifiedSince headsWith date.toFormattedString()
+    }
+
+    override fun ifModifiedSince(date: String) {
+        HttpHeaders.IfModifiedSince headsWith date
+    }
+
+    override fun authentication(username: String, password: String) {
+        HttpHeaders.Authorization headsWith "Basic ${"$username:$password".encodeBase64()}"
+    }
+
+    override fun authentication(base64: String) {
+        HttpHeaders.Authorization headsWith base64
+    }
+
+    override fun inRange(start: Number?, end: Number?) {
+        if (start == null) return
+        val valueString = if (end != null) "bytes=$start-$end" else "bytes=$start-"
+        HttpHeaders.Range headsWith valueString
+    }
+
+    private companion object {
+        val HTTP_DATE_FORMAT: SimpleDateFormat
+            get() = SimpleDateFormat("EEE, dd MMM yyyy HH:mm:ss z", Locale.US).apply {
+                timeZone = TimeZone.getTimeZone("GMT")
+            }
+
+        fun Date.toFormattedString(): String = HTTP_DATE_FORMAT.format(this)
+    }
+}

app/src/main/kotlin/com/looker/droidify/network/validation/FileValidator.kt

@@ -0,0 +1,10 @@
+package com.looker.droidify.network.validation
+
+import java.io.File
+
+interface FileValidator {
+
+    @Throws(ValidationException::class)
+    suspend fun validate(file: File)
+
+}

app/src/main/kotlin/com/looker/droidify/network/validation/ValidationException.kt

@@ -0,0 +1,6 @@
+package com.looker.droidify.network.validation
+
+class ValidationException(override val message: String) : Exception(message)
+
+@Suppress("NOTHING_TO_INLINE")
+inline fun invalid(message: String): Nothing = throw ValidationException(message)

app/src/main/kotlin/com/looker/droidify/receivers/InstalledAppReceiver.kt

@@ -0,0 +1,30 @@
+package com.looker.droidify.receivers
+
+import android.content.BroadcastReceiver
+import android.content.Context
+import android.content.Intent
+import android.content.pm.PackageManager
+import com.looker.droidify.utility.common.extension.getPackageInfoCompat
+import com.looker.droidify.database.Database
+import com.looker.droidify.utility.extension.toInstalledItem
+
+class InstalledAppReceiver(private val packageManager: PackageManager) : BroadcastReceiver() {
+    override fun onReceive(context: Context, intent: Intent) {
+        val packageName =
+            intent.data?.let { if (it.scheme == "package") it.schemeSpecificPart else null }
+        if (packageName != null) {
+            when (intent.action.orEmpty()) {
+                Intent.ACTION_PACKAGE_ADDED,
+                Intent.ACTION_PACKAGE_REMOVED
+                -> {
+                    val packageInfo = packageManager.getPackageInfoCompat(packageName)
+                    if (packageInfo != null) {
+                        Database.InstalledAdapter.put(packageInfo.toInstalledItem())
+                    } else {
+                        Database.InstalledAdapter.delete(packageName)
+                    }
+                }
+            }
+        }
+    }
+}

app/src/main/kotlin/com/looker/droidify/service/Connection.kt

@@ -0,0 +1,43 @@
+package com.looker.droidify.service
+
+import android.content.ComponentName
+import android.content.Context
+import android.content.Intent
+import android.content.ServiceConnection
+import android.os.IBinder
+
+class Connection<B : IBinder, S : ConnectionService<B>>(
+    private val serviceClass: Class<S>,
+    private val onBind: ((Connection<B, S>, B) -> Unit)? = null,
+    private val onUnbind: ((Connection<B, S>, B) -> Unit)? = null
+) : ServiceConnection {
+    var binder: B? = null
+        private set
+
+    private fun handleUnbind() {
+        binder?.let {
+            binder = null
+            onUnbind?.invoke(this, it)
+        }
+    }
+
+    override fun onServiceConnected(componentName: ComponentName, binder: IBinder) {
+        @Suppress("UNCHECKED_CAST")
+        binder as B
+        this.binder = binder
+        onBind?.invoke(this, binder)
+    }
+
+    override fun onServiceDisconnected(componentName: ComponentName) {
+        handleUnbind()
+    }
+
+    fun bind(context: Context) {
+        context.bindService(Intent(context, serviceClass), this, Context.BIND_AUTO_CREATE)
+    }
+
+    fun unbind(context: Context) {
+        context.unbindService(this)
+        handleUnbind()
+    }
+}

app/src/main/kotlin/com/looker/droidify/service/ConnectionService.kt

@@ -0,0 +1,22 @@
+package com.looker.droidify.service
+
+import android.app.Service
+import android.content.Intent
+import android.os.IBinder
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.SupervisorJob
+import kotlinx.coroutines.cancel
+
+abstract class ConnectionService<T : IBinder> : Service() {
+
+    private val supervisorJob = SupervisorJob()
+    val lifecycleScope = CoroutineScope(Dispatchers.Main + supervisorJob)
+
+    abstract override fun onBind(intent: Intent): T
+
+    override fun onDestroy() {
+        super.onDestroy()
+        lifecycleScope.cancel()
+    }
+}

app/src/main/kotlin/com/looker/droidify/service/DownloadService.kt

@@ -0,0 +1,475 @@
+package com.looker.droidify.service
+
+import android.app.PendingIntent
+import android.content.Intent
+import android.graphics.Color
+import android.net.Uri
+import android.util.Log
+import androidx.core.app.NotificationCompat
+import com.looker.droidify.BuildConfig
+import com.looker.droidify.MainActivity
+import com.looker.droidify.datastore.SettingsRepository
+import com.looker.droidify.datastore.get
+import com.looker.droidify.datastore.model.InstallerType
+import com.looker.droidify.installer.InstallManager
+import com.looker.droidify.installer.model.InstallState
+import com.looker.droidify.installer.model.installFrom
+import com.looker.droidify.installer.notification.createInstallNotification
+import com.looker.droidify.installer.notification.installNotification
+import com.looker.droidify.model.Release
+import com.looker.droidify.model.Repository
+import com.looker.droidify.network.DataSize
+import com.looker.droidify.network.Downloader
+import com.looker.droidify.network.NetworkResponse
+import com.looker.droidify.network.percentBy
+import com.looker.droidify.network.validation.ValidationException
+import com.looker.droidify.utility.common.Constants
+import com.looker.droidify.utility.common.Constants.NOTIFICATION_CHANNEL_INSTALL
+import com.looker.droidify.utility.common.SdkCheck
+import com.looker.droidify.utility.common.cache.Cache
+import com.looker.droidify.utility.common.createNotificationChannel
+import com.looker.droidify.utility.common.extension.notificationManager
+import com.looker.droidify.utility.common.extension.startServiceCompat
+import com.looker.droidify.utility.common.extension.stopForegroundCompat
+import com.looker.droidify.utility.common.extension.toPendingIntent
+import com.looker.droidify.utility.common.extension.updateAsMutable
+import com.looker.droidify.utility.common.log
+import dagger.hilt.android.AndroidEntryPoint
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.Job
+import kotlinx.coroutines.flow.MutableStateFlow
+import kotlinx.coroutines.flow.asStateFlow
+import kotlinx.coroutines.flow.collectLatest
+import kotlinx.coroutines.flow.filter
+import kotlinx.coroutines.flow.first
+import kotlinx.coroutines.flow.sample
+import kotlinx.coroutines.flow.update
+import kotlinx.coroutines.launch
+import kotlinx.coroutines.sync.Mutex
+import kotlinx.coroutines.sync.withLock
+import kotlinx.coroutines.yield
+import java.io.File
+import javax.inject.Inject
+import com.looker.droidify.R.string as stringRes
+
+@AndroidEntryPoint
+class DownloadService : ConnectionService<DownloadService.Binder>() {
+    companion object {
+        private const val ACTION_CANCEL = "${BuildConfig.APPLICATION_ID}.intent.action.CANCEL"
+    }
+
+    @Inject
+    lateinit var settingsRepository: SettingsRepository
+
+    @Inject
+    lateinit var downloader: Downloader
+
+    private val installerType
+        get() = settingsRepository.get { installerType }
+
+    @Inject
+    lateinit var installer: InstallManager
+
+    sealed class State(val packageName: String) {
+        data object Idle : State("")
+        data class Connecting(val name: String) : State(name)
+        data class Downloading(val name: String, val read: DataSize, val total: DataSize?) : State(
+            name
+        )
+
+        data class Error(val name: String) : State(name)
+        data class Cancel(val name: String) : State(name)
+        data class Success(val name: String, val release: Release) : State(name)
+    }
+
+    data class DownloadState(
+        val currentItem: State = State.Idle,
+        val queue: List<String> = emptyList()
+    ) {
+        infix fun isDownloading(packageName: String): Boolean =
+            currentItem.packageName == packageName && (
+                currentItem is State.Connecting || currentItem is State.Downloading
+                )
+
+        infix fun isComplete(packageName: String): Boolean =
+            currentItem.packageName == packageName && (
+                currentItem is State.Error ||
+                    currentItem is State.Cancel ||
+                    currentItem is State.Success ||
+                    currentItem is State.Idle
+                )
+    }
+
+    private val _downloadState = MutableStateFlow(DownloadState())
+
+    private class Task(
+        val packageName: String,
+        val name: String,
+        val release: Release,
+        val url: String,
+        val authentication: String,
+        val isUpdate: Boolean = false
+    ) {
+        val notificationTag: String
+            get() = "download-$packageName"
+    }
+
+    private data class CurrentTask(val task: Task, val job: Job, val lastState: State)
+
+    private var started = false
+    private val tasks = mutableListOf<Task>()
+    private var currentTask: CurrentTask? = null
+
+    private val lock = Mutex()
+
+    inner class Binder : android.os.Binder() {
+        val downloadState = _downloadState.asStateFlow()
+        fun enqueue(
+            packageName: String,
+            name: String,
+            repository: Repository,
+            release: Release,
+            isUpdate: Boolean = false
+        ) {
+            val task = Task(
+                packageName = packageName,
+                name = name,
+                release = release,
+                url = release.getDownloadUrl(repository),
+                authentication = repository.authentication,
+                isUpdate = isUpdate
+            )
+            if (Cache.getReleaseFile(this@DownloadService, release.cacheFileName).exists()) {
+                lifecycleScope.launch { publishSuccess(task) }
+                return
+            }
+            cancelTasks(packageName)
+            cancelCurrentTask(packageName)
+            notificationManager?.cancel(
+                task.notificationTag,
+                Constants.NOTIFICATION_ID_DOWNLOADING
+            )
+            tasks += task
+            if (currentTask == null) {
+                handleDownload()
+            } else {
+                updateCurrentQueue { add(packageName) }
+            }
+        }
+
+        fun cancel(packageName: String) {
+            cancelTasks(packageName)
+            cancelCurrentTask(packageName)
+        }
+    }
+
+    private val binder = Binder()
+    override fun onBind(intent: Intent): Binder = binder
+
+    override fun onCreate() {
+        super.onCreate()
+        createNotificationChannel(
+            id = Constants.NOTIFICATION_CHANNEL_DOWNLOADING,
+            name = getString(stringRes.downloading),
+        )
+        createNotificationChannel(
+            id = NOTIFICATION_CHANNEL_INSTALL,
+            name = getString(stringRes.install)
+        )
+
+        lifecycleScope.launch {
+            _downloadState
+                .filter { currentTask != null }
+                .sample(400)
+                .collectLatest {
+                    publishForegroundState(false, it.currentItem)
+                }
+        }
+    }
+
+    override fun onTimeout(startId: Int) {
+        super.onTimeout(startId)
+        onDestroy()
+        stopSelf()
+    }
+
+    override fun onDestroy() {
+        super.onDestroy()
+        cancelTasks(null)
+        cancelCurrentTask(null)
+    }
+
+    override fun onStartCommand(intent: Intent?, flags: Int, startId: Int): Int {
+        if (intent?.action == ACTION_CANCEL) {
+            currentTask?.let { binder.cancel(it.task.packageName) }
+        }
+        return START_NOT_STICKY
+    }
+
+    private fun cancelTasks(packageName: String?) {
+        tasks.removeAll {
+            (packageName == null || it.packageName == packageName) && run {
+                updateCurrentState(State.Cancel(it.packageName))
+                true
+            }
+        }
+    }
+
+    private fun cancelCurrentTask(packageName: String?) {
+        currentTask?.let {
+            if (packageName == null || it.task.packageName == packageName) {
+                it.job.cancel()
+                currentTask = null
+                updateCurrentState(State.Cancel(it.task.packageName))
+            }
+        }
+    }
+
+    private sealed interface ErrorType {
+        data object IO : ErrorType
+        data object Http : ErrorType
+        data object SocketTimeout : ErrorType
+        data object ConnectionTimeout : ErrorType
+        class Validation(val exception: ValidationException) : ErrorType
+    }
+
+    private fun showNotificationError(task: Task, errorType: ErrorType) {
+        val intent = Intent(this, MainActivity::class.java)
+            .setAction(Intent.ACTION_VIEW)
+            .setData(Uri.parse("package:${task.packageName}"))
+            .setFlags(Intent.FLAG_ACTIVITY_NEW_TASK or Intent.FLAG_ACTIVITY_CLEAR_TASK)
+            .toPendingIntent(this)
+        notificationManager?.notify(
+            task.notificationTag,
+            Constants.NOTIFICATION_ID_DOWNLOADING,
+            NotificationCompat
+                .Builder(this, Constants.NOTIFICATION_CHANNEL_DOWNLOADING)
+                .setAutoCancel(true)
+                .setSmallIcon(android.R.drawable.stat_notify_error)
+                .setColor(Color.GREEN)
+                .setOnlyAlertOnce(true)
+                .setContentIntent(intent)
+                .errorNotificationContent(task, errorType)
+                .build()
+        )
+    }
+
+    private fun NotificationCompat.Builder.errorNotificationContent(
+        task: Task,
+        errorType: ErrorType
+    ): NotificationCompat.Builder {
+        val title = if (errorType is ErrorType.Validation) {
+            stringRes.could_not_validate_FORMAT
+        } else {
+            stringRes.could_not_download_FORMAT
+        }
+        val description = when (errorType) {
+            ErrorType.ConnectionTimeout -> getString(stringRes.connection_error_DESC)
+            ErrorType.Http -> getString(stringRes.http_error_DESC)
+            ErrorType.IO -> getString(stringRes.io_error_DESC)
+            ErrorType.SocketTimeout -> getString(stringRes.socket_error_DESC)
+            is ErrorType.Validation -> errorType.exception.message
+        }
+        setContentTitle(getString(title, task.name))
+        return setContentText(description)
+    }
+
+    private fun showNotificationInstall(task: Task) {
+        val intent = Intent(this, MainActivity::class.java)
+            .setAction(MainActivity.ACTION_INSTALL)
+            .setData(Uri.parse("package:${task.packageName}"))
+            .putExtra(MainActivity.EXTRA_CACHE_FILE_NAME, task.release.cacheFileName)
+            .setFlags(Intent.FLAG_ACTIVITY_NEW_TASK or Intent.FLAG_ACTIVITY_CLEAR_TASK)
+            .toPendingIntent(this)
+        val notification = createInstallNotification(
+            appName = task.name,
+            state = InstallState.Pending,
+            autoCancel = true,
+        ) {
+            setContentIntent(intent)
+        }
+        notificationManager?.installNotification(
+            packageName = task.packageName,
+            notification = notification,
+        )
+    }
+
+    private suspend fun publishSuccess(task: Task) {
+        val currentInstaller = installerType.first()
+        updateCurrentQueue { add("") }
+        updateCurrentState(State.Success(task.packageName, task.release))
+        val autoInstallWithSessionInstaller =
+            SdkCheck.canAutoInstall(task.release.targetSdkVersion) &&
+                currentInstaller == InstallerType.SESSION &&
+                task.isUpdate
+
+        showNotificationInstall(task)
+        if (currentInstaller == InstallerType.ROOT ||
+            currentInstaller == InstallerType.SHIZUKU ||
+            autoInstallWithSessionInstaller
+        ) {
+            val installItem = task.packageName installFrom task.release.cacheFileName
+            installer install installItem
+        }
+    }
+
+    private val stateNotificationBuilder by lazy {
+        NotificationCompat
+            .Builder(this, Constants.NOTIFICATION_CHANNEL_DOWNLOADING)
+            .setSmallIcon(android.R.drawable.stat_sys_download)
+            .setColor(Color.GREEN)
+            .addAction(
+                0,
+                getString(stringRes.cancel),
+                PendingIntent.getService(
+                    this,
+                    0,
+                    Intent(this, this::class.java).setAction(ACTION_CANCEL),
+                    PendingIntent.FLAG_UPDATE_CURRENT or PendingIntent.FLAG_IMMUTABLE
+                )
+            )
+    }
+
+    private fun publishForegroundState(force: Boolean, state: State) {
+        if (!force && currentTask == null) return
+        currentTask = currentTask!!.copy(lastState = state)
+        stateNotificationBuilder.downloadingNotificationContent(state)
+            ?.let { notification ->
+                startForeground(
+                    Constants.NOTIFICATION_ID_DOWNLOADING,
+                    notification.build()
+                )
+            } ?: run {
+            log("Invalid Download State: $state", "DownloadService", Log.ERROR)
+        }
+    }
+
+    private fun NotificationCompat.Builder.downloadingNotificationContent(
+        state: State
+    ): NotificationCompat.Builder? {
+        return when (state) {
+            is State.Connecting -> {
+                setContentTitle(getString(stringRes.downloading_FORMAT, currentTask!!.task.name))
+                setContentText(getString(stringRes.connecting))
+                setProgress(1, 0, true)
+            }
+
+            is State.Downloading -> {
+                setContentTitle(getString(stringRes.downloading_FORMAT, currentTask!!.task.name))
+                if (state.total != null) {
+                    setContentText("${state.read} / ${state.total}")
+                    setProgress(100, state.read.value percentBy state.total.value, false)
+                } else {
+                    setContentText(state.read.toString())
+                    setProgress(0, 0, true)
+                }
+            }
+
+            else -> null
+        }
+    }
+
+    private fun handleDownload() {
+        if (currentTask != null) return
+        if (tasks.isEmpty() && started) {
+            started = false
+            stopForegroundCompat()
+            return
+        }
+        if (!started) {
+            started = true
+            startServiceCompat()
+        }
+        val task = tasks.removeFirstOrNull() ?: return
+        with(stateNotificationBuilder) {
+            setWhen(System.currentTimeMillis())
+            setContentIntent(createNotificationIntent(task.packageName))
+        }
+        val connectionState = State.Connecting(task.packageName)
+        val partialReleaseFile =
+            Cache.getPartialReleaseFile(this, task.release.cacheFileName)
+        val job = lifecycleScope.downloadFile(task, partialReleaseFile)
+        currentTask = CurrentTask(task, job, connectionState)
+        publishForegroundState(true, connectionState)
+        updateCurrentState(State.Connecting(task.packageName))
+    }
+
+    private fun createNotificationIntent(packageName: String): PendingIntent? =
+        Intent(this, MainActivity::class.java)
+            .setAction(Intent.ACTION_VIEW)
+            .setData(Uri.parse("package:$packageName"))
+            .setFlags(Intent.FLAG_ACTIVITY_NEW_TASK)
+            .toPendingIntent(this)
+
+    private fun CoroutineScope.downloadFile(
+        task: Task,
+        target: File
+    ) = launch {
+        try {
+            val releaseValidator = ReleaseFileValidator(
+                context = this@DownloadService,
+                packageName = task.packageName,
+                release = task.release
+            )
+            val response = downloader.downloadToFile(
+                url = task.url,
+                target = target,
+                validator = releaseValidator,
+                headers = { authentication(task.authentication) }
+            ) { read, total ->
+                yield()
+                updateCurrentState(State.Downloading(task.packageName, read, total))
+            }
+
+            when (response) {
+                is NetworkResponse.Success -> {
+                    val releaseFile = Cache.getReleaseFile(
+                        this@DownloadService,
+                        task.release.cacheFileName
+                    )
+                    target.renameTo(releaseFile)
+                    publishSuccess(task)
+                }
+
+                is NetworkResponse.Error -> {
+                    updateCurrentState(State.Error(task.packageName))
+                    val errorType = when (response) {
+                        is NetworkResponse.Error.ConnectionTimeout -> ErrorType.ConnectionTimeout
+                        is NetworkResponse.Error.IO -> ErrorType.IO
+                        is NetworkResponse.Error.SocketTimeout -> ErrorType.SocketTimeout
+                        is NetworkResponse.Error.Validation -> ErrorType.Validation(
+                            response.exception
+                        )
+
+                        else -> ErrorType.Http
+                    }
+                    showNotificationError(task, errorType)
+                }
+            }
+        } finally {
+            lock.withLock { currentTask = null }
+            handleDownload()
+        }
+    }
+
+    private fun updateCurrentState(state: State) {
+        _downloadState.update {
+            val newQueue =
+                if (state.packageName in it.queue) {
+                    it.queue.updateAsMutable {
+                        removeAll { name -> name == "" }
+                        remove(state.packageName)
+                    }
+                } else {
+                    it.queue
+                }
+            it.copy(currentItem = state, queue = newQueue)
+        }
+    }
+
+    private fun updateCurrentQueue(block: MutableList<String>.() -> Unit) {
+        _downloadState.update { state ->
+            state.copy(queue = state.queue.updateAsMutable(block))
+        }
+    }
+}

app/src/main/kotlin/com/looker/droidify/service/ReleaseFileValidator.kt

@@ -0,0 +1,51 @@
+package com.looker.droidify.service
+
+import android.content.Context
+import androidx.annotation.StringRes
+import com.looker.droidify.utility.common.extension.calculateHash
+import com.looker.droidify.utility.common.extension.getPackageArchiveInfoCompat
+import com.looker.droidify.utility.common.extension.singleSignature
+import com.looker.droidify.utility.common.extension.versionCodeCompat
+import com.looker.droidify.network.validation.FileValidator
+import com.looker.droidify.utility.common.signature.Hash
+import com.looker.droidify.network.validation.invalid
+import com.looker.droidify.utility.common.signature.verifyHash
+import com.looker.droidify.model.Release
+import java.io.File
+import com.looker.droidify.R.string as strings
+
+class ReleaseFileValidator(
+    private val context: Context,
+    private val packageName: String,
+    private val release: Release
+) : FileValidator {
+
+    override suspend fun validate(file: File) {
+        val hash = Hash(release.hashType, release.hash)
+        if (!file.verifyHash(hash)) {
+            invalid(getString(strings.integrity_check_error_DESC))
+        }
+        val packageInfo = context.packageManager.getPackageArchiveInfoCompat(file.path)
+            ?: invalid(getString(strings.file_format_error_DESC))
+        if (packageInfo.packageName != packageName ||
+            packageInfo.versionCodeCompat != release.versionCode
+        ) {
+            invalid(getString(strings.invalid_metadata_error_DESC))
+        }
+
+        packageInfo.singleSignature
+            ?.calculateHash()
+            ?.takeIf { it.isNotBlank() || it == release.signature }
+            ?: invalid(getString(strings.invalid_signature_error_DESC))
+
+        packageInfo.permissions
+            ?.asSequence()
+            .orEmpty()
+            .map { it.name }
+            .toSet()
+            .takeIf { release.permissions.containsAll(it) }
+            ?: invalid(getString(strings.invalid_permissions_error_DESC))
+    }
+
+    private fun getString(@StringRes id: Int): String = context.getString(id)
+}

app/src/main/kotlin/com/looker/droidify/service/SyncService.kt

@@ -0,0 +1,667 @@
+package com.looker.droidify.service
+
+import android.annotation.SuppressLint
+import android.app.PendingIntent
+import android.app.job.JobInfo
+import android.app.job.JobParameters
+import android.app.job.JobService
+import android.content.ComponentName
+import android.content.Context
+import android.content.Intent
+import android.graphics.Color
+import android.os.Build
+import android.text.SpannableStringBuilder
+import android.text.style.ForegroundColorSpan
+import android.view.ContextThemeWrapper
+import androidx.core.app.NotificationCompat
+import androidx.fragment.app.Fragment
+import com.looker.droidify.utility.common.Constants
+import com.looker.droidify.utility.common.SdkCheck
+import com.looker.droidify.utility.common.createNotificationChannel
+import com.looker.droidify.utility.common.extension.getColorFromAttr
+import com.looker.droidify.utility.common.extension.notificationManager
+import com.looker.droidify.utility.common.extension.startServiceCompat
+import com.looker.droidify.utility.common.extension.stopForegroundCompat
+import com.looker.droidify.utility.common.result.Result
+import com.looker.droidify.utility.common.sdkAbove
+import com.looker.droidify.datastore.SettingsRepository
+import com.looker.droidify.BuildConfig
+import com.looker.droidify.MainActivity
+import com.looker.droidify.database.Database
+import com.looker.droidify.index.RepositoryUpdater
+import com.looker.droidify.model.ProductItem
+import com.looker.droidify.model.Repository
+import com.looker.droidify.utility.extension.startUpdate
+import com.looker.droidify.network.DataSize
+import com.looker.droidify.network.percentBy
+import dagger.hilt.android.AndroidEntryPoint
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.NonCancellable
+import kotlinx.coroutines.cancel
+import kotlinx.coroutines.flow.MutableSharedFlow
+import kotlinx.coroutines.flow.SharedFlow
+import kotlinx.coroutines.flow.asSharedFlow
+import kotlinx.coroutines.flow.collectLatest
+import kotlinx.coroutines.flow.filter
+import kotlinx.coroutines.flow.sample
+import kotlinx.coroutines.launch
+import kotlinx.coroutines.sync.Mutex
+import kotlinx.coroutines.sync.withLock
+import kotlinx.coroutines.withContext
+import java.lang.ref.WeakReference
+import javax.inject.Inject
+import com.looker.droidify.R
+import kotlinx.coroutines.FlowPreview
+import kotlin.math.roundToInt
+import android.R as AndroidR
+import com.looker.droidify.R.string as stringRes
+import com.looker.droidify.R.style as styleRes
+import kotlinx.coroutines.Job as CoroutinesJob
+
+@AndroidEntryPoint
+class SyncService : ConnectionService<SyncService.Binder>() {
+
+    companion object {
+        private const val MAX_PROGRESS = 100
+
+        private const val NOTIFICATION_UPDATE_SAMPLING = 400L
+
+        private const val MAX_UPDATE_NOTIFICATION = 5
+        private const val ACTION_CANCEL = "${BuildConfig.APPLICATION_ID}.intent.action.CANCEL"
+
+        val syncState = MutableSharedFlow<State>()
+    }
+
+    @Inject
+    lateinit var settingsRepository: SettingsRepository
+
+    sealed class State(val name: String) {
+        class Connecting(appName: String) : State(appName)
+
+        class Syncing(
+            val appName: String,
+            val stage: RepositoryUpdater.Stage,
+            val read: DataSize,
+            val total: DataSize?
+        ) : State(appName)
+
+        data object Finish : State("")
+
+        val progress: Int
+            get() = when (this) {
+                is Connecting -> Int.MIN_VALUE
+                Finish -> Int.MAX_VALUE
+                is Syncing -> when(stage) {
+                    RepositoryUpdater.Stage.DOWNLOAD -> ((read percentBy total) * 0.4F).roundToInt()
+                    RepositoryUpdater.Stage.PROCESS -> 50
+                    RepositoryUpdater.Stage.MERGE -> 75
+                    RepositoryUpdater.Stage.COMMIT -> 90
+                }
+            }
+    }
+
+    private class Task(val repositoryId: Long, val manual: Boolean)
+    private data class CurrentTask(
+        val task: Task?,
+        val job: CoroutinesJob,
+        val hasUpdates: Boolean,
+        val lastState: State
+    )
+
+    private enum class Started { NO, AUTO, MANUAL }
+
+    private var started = Started.NO
+    private val tasks = mutableListOf<Task>()
+    private var currentTask: CurrentTask? = null
+
+    private var updateNotificationBlockerFragment: WeakReference<Fragment>? = null
+
+    private val downloadConnection = Connection(DownloadService::class.java)
+    private val lock = Mutex()
+
+    enum class SyncRequest { AUTO, MANUAL, FORCE }
+
+    inner class Binder : android.os.Binder() {
+
+        val state: SharedFlow<State>
+            get() = syncState.asSharedFlow()
+
+        private fun sync(ids: List<Long>, request: SyncRequest) {
+            val cancelledTask =
+                cancelCurrentTask { request == SyncRequest.FORCE && it.task?.repositoryId in ids }
+            cancelTasks { !it.manual && it.repositoryId in ids }
+            val currentIds = tasks.asSequence().map { it.repositoryId }.toSet()
+            val manual = request != SyncRequest.AUTO
+            tasks += ids.asSequence().filter {
+                it !in currentIds &&
+                    it != currentTask?.task?.repositoryId
+            }.map { Task(it, manual) }
+            handleNextTask(cancelledTask?.hasUpdates == true)
+            if (request != SyncRequest.AUTO && started == Started.AUTO) {
+                started = Started.MANUAL
+                startServiceCompat()
+                handleSetStarted()
+                currentTask?.lastState?.let { publishForegroundState(true, it) }
+            }
+        }
+
+        fun sync(request: SyncRequest) {
+            val ids = Database.RepositoryAdapter.getAll()
+                .asSequence().filter { it.enabled }.map { it.id }.toList()
+            sync(ids, request)
+        }
+
+        fun sync(repository: Repository) {
+            if (repository.enabled) {
+                sync(listOf(repository.id), SyncRequest.FORCE)
+            }
+        }
+
+        suspend fun updateAllApps() {
+            val skipSignature = settingsRepository.getInitial().ignoreSignature
+            updateAllAppsInternal(skipSignature)
+        }
+
+        fun setUpdateNotificationBlocker(fragment: Fragment?) {
+            updateNotificationBlockerFragment = fragment?.let(::WeakReference)
+            if (fragment != null) {
+                notificationManager?.cancel(Constants.NOTIFICATION_ID_UPDATES)
+            }
+        }
+
+        fun setEnabled(repository: Repository, enabled: Boolean): Boolean {
+            Database.RepositoryAdapter.put(repository.enable(enabled))
+            if (enabled) {
+                val isRepoInTasks = repository.id != currentTask?.task?.repositoryId &&
+                    !tasks.any { it.repositoryId == repository.id }
+                if (isRepoInTasks) {
+                    tasks += Task(repository.id, true)
+                    handleNextTask(false)
+                }
+            } else {
+                cancelTasks { it.repositoryId == repository.id }
+                val cancelledTask = cancelCurrentTask {
+                    it.task?.repositoryId == repository.id
+                }
+                handleNextTask(cancelledTask?.hasUpdates == true)
+            }
+            return true
+        }
+
+        fun isCurrentlySyncing(repositoryId: Long): Boolean {
+            return currentTask?.task?.repositoryId == repositoryId
+        }
+
+        fun deleteRepository(repositoryId: Long): Boolean {
+            val repository = Database.RepositoryAdapter.get(repositoryId)
+            return repository != null && run {
+                setEnabled(repository, false)
+                Database.RepositoryAdapter.markAsDeleted(repository.id)
+                true
+            }
+        }
+
+        fun cancelAuto(): Boolean {
+            val removed = cancelTasks { !it.manual }
+            val currentTask = cancelCurrentTask { it.task?.manual == false }
+            handleNextTask(currentTask?.hasUpdates == true)
+            return removed || currentTask != null
+        }
+    }
+
+    private val binder = Binder()
+    override fun onBind(intent: Intent): Binder = binder
+
+    @OptIn(FlowPreview::class)
+    override fun onCreate() {
+        super.onCreate()
+
+        createNotificationChannel(
+            id = Constants.NOTIFICATION_CHANNEL_SYNCING,
+            name = getString(stringRes.syncing),
+        )
+        createNotificationChannel(
+            id = Constants.NOTIFICATION_CHANNEL_UPDATES,
+            name = getString(stringRes.updates),
+        )
+
+        downloadConnection.bind(this)
+        lifecycleScope.launch {
+            syncState
+                .sample(NOTIFICATION_UPDATE_SAMPLING)
+                .collectLatest {
+                    publishForegroundState(false, it)
+                }
+        }
+    }
+
+    override fun onTimeout(startId: Int) {
+        super.onTimeout(startId)
+        onDestroy()
+        stopSelf()
+    }
+
+    override fun onDestroy() {
+        super.onDestroy()
+        downloadConnection.unbind(this)
+        cancelTasks { true }
+        cancelCurrentTask { true }
+    }
+
+    override fun onStartCommand(intent: Intent?, flags: Int, startId: Int): Int {
+        if (intent?.action == ACTION_CANCEL) {
+            tasks.clear()
+            val cancelledTask = cancelCurrentTask { it.task != null }
+            handleNextTask(cancelledTask?.hasUpdates == true)
+        }
+        return START_NOT_STICKY
+    }
+
+    private fun cancelTasks(condition: (Task) -> Boolean): Boolean {
+        return tasks.removeAll(condition)
+    }
+
+    private fun cancelCurrentTask(condition: ((CurrentTask) -> Boolean)): CurrentTask? {
+        return currentTask?.let {
+            if (condition(it)) {
+                currentTask = null
+                it.job.cancel()
+                RepositoryUpdater.await()
+                it
+            } else {
+                null
+            }
+        }
+    }
+
+    private fun showNotificationError(repository: Repository, exception: Exception) {
+        val description = getString(
+            when (exception) {
+                is RepositoryUpdater.UpdateException -> when (exception.errorType) {
+                    RepositoryUpdater.ErrorType.NETWORK -> stringRes.network_error_DESC
+                    RepositoryUpdater.ErrorType.HTTP -> stringRes.http_error_DESC
+                    RepositoryUpdater.ErrorType.VALIDATION -> stringRes.validation_index_error_DESC
+                    RepositoryUpdater.ErrorType.PARSING -> stringRes.parsing_index_error_DESC
+                }
+
+                else -> stringRes.unknown_error_DESC
+            }
+        )
+        notificationManager?.notify(
+            "repository-${repository.id}",
+            Constants.NOTIFICATION_ID_SYNCING,
+            NotificationCompat
+                .Builder(this, Constants.NOTIFICATION_CHANNEL_SYNCING)
+                .setSmallIcon(AndroidR.drawable.stat_sys_warning)
+                .setColor(
+                    ContextThemeWrapper(this, styleRes.Theme_Main_Light)
+                        .getColorFromAttr(AndroidR.attr.colorPrimary).defaultColor
+                )
+                .setContentTitle(getString(stringRes.could_not_sync_FORMAT, repository.name))
+                .setContentText(description)
+                .build()
+        )
+    }
+
+    private val stateNotificationBuilder by lazy {
+        NotificationCompat
+            .Builder(this, Constants.NOTIFICATION_CHANNEL_SYNCING)
+            .setSmallIcon(R.drawable.ic_sync)
+            .setColor(
+                ContextThemeWrapper(this, styleRes.Theme_Main_Light)
+                    .getColorFromAttr(AndroidR.attr.colorPrimary).defaultColor
+            )
+            .addAction(
+                0,
+                getString(stringRes.cancel),
+                PendingIntent.getService(
+                    this,
+                    0,
+                    Intent(this, this::class.java).setAction(ACTION_CANCEL),
+                    PendingIntent.FLAG_UPDATE_CURRENT or PendingIntent.FLAG_IMMUTABLE
+                )
+            )
+    }
+
+    private fun publishForegroundState(force: Boolean, state: State) {
+        if (force || currentTask?.lastState != state) {
+            currentTask = currentTask?.copy(lastState = state)
+            if (started == Started.MANUAL) {
+                startForeground(
+                    Constants.NOTIFICATION_ID_SYNCING,
+                    stateNotificationBuilder.apply {
+                        setContentTitle(getString(stringRes.syncing_FORMAT, state.name))
+                        when (state) {
+                            is State.Connecting -> {
+                                setContentText(getString(stringRes.connecting))
+                                setProgress(0, 0, true)
+                            }
+
+                            is State.Syncing -> {
+                                when (state.stage) {
+                                    RepositoryUpdater.Stage.DOWNLOAD -> {
+                                        if (state.total != null) {
+                                            setContentText("${state.read} / ${state.total}")
+                                            setProgress(
+                                                MAX_PROGRESS,
+                                                state.read percentBy state.total,
+                                                false
+                                            )
+                                        } else {
+                                            setContentText(state.read.toString())
+                                            setProgress(0, 0, true)
+                                        }
+                                    }
+
+                                    RepositoryUpdater.Stage.PROCESS -> {
+                                        val progress = (state.read percentBy state.total)
+                                            .takeIf { it != -1 }
+                                        setContentText(
+                                            getString(
+                                                stringRes.processing_FORMAT,
+                                                "${progress ?: 0}%"
+                                            )
+                                        )
+                                        setProgress(MAX_PROGRESS, progress ?: 0, progress == null)
+                                    }
+
+                                    RepositoryUpdater.Stage.MERGE -> {
+                                        val progress = (state.read percentBy state.total)
+                                        setContentText(
+                                            getString(
+                                                stringRes.merging_FORMAT,
+                                                "${state.read.value} / ${state.total?.value ?: state.read.value}"
+                                            )
+                                        )
+                                        setProgress(MAX_PROGRESS, progress, false)
+                                    }
+
+                                    RepositoryUpdater.Stage.COMMIT -> {
+                                        setContentText(getString(stringRes.saving_details))
+                                        setProgress(0, 0, true)
+                                    }
+                                }
+                            }
+
+                            is State.Finish -> {}
+                        }
+                    }.build()
+                )
+            }
+        }
+    }
+
+    private fun handleSetStarted() {
+        stateNotificationBuilder.setWhen(System.currentTimeMillis())
+    }
+
+    private fun handleNextTask(hasUpdates: Boolean) {
+        if (currentTask != null) return
+        if (tasks.isEmpty()) {
+            if (started != Started.NO) {
+                lifecycleScope.launch {
+                    val setting = settingsRepository.getInitial()
+                    handleUpdates(
+                        hasUpdates = hasUpdates,
+                        notifyUpdates = setting.notifyUpdate,
+                        autoUpdate = setting.autoUpdate,
+                        skipSignature = setting.ignoreSignature,
+                    )
+                }
+            }
+            return
+        }
+        val task = tasks.removeAt(0)
+        val repository = Database.RepositoryAdapter.get(task.repositoryId)
+        if (repository == null || !repository.enabled) handleNextTask(hasUpdates)
+        val lastStarted = started
+        val newStarted = if (task.manual || lastStarted == Started.MANUAL) {
+            Started.MANUAL
+        } else {
+            Started.AUTO
+        }
+        started = newStarted
+        if (newStarted == Started.MANUAL && lastStarted != Started.MANUAL) {
+            startServiceCompat()
+            handleSetStarted()
+        }
+        val initialState = State.Connecting(repository!!.name)
+        publishForegroundState(true, initialState)
+        lifecycleScope.launch {
+            val unstableUpdates =
+                settingsRepository.getInitial().unstableUpdate
+            val downloadJob = downloadFile(
+                task = task,
+                repository = repository,
+                hasUpdates = hasUpdates,
+                unstableUpdates = unstableUpdates
+            )
+            currentTask = CurrentTask(task, downloadJob, hasUpdates, initialState)
+        }
+    }
+
+    private fun CoroutineScope.downloadFile(
+        task: Task,
+        repository: Repository,
+        hasUpdates: Boolean,
+        unstableUpdates: Boolean
+    ): CoroutinesJob = launch(Dispatchers.Default) {
+        var passedHasUpdates = hasUpdates
+        try {
+            val response = RepositoryUpdater.update(
+                this@SyncService,
+                repository,
+                unstableUpdates
+            ) { stage, progress, total ->
+                launch {
+                    syncState.emit(
+                        State.Syncing(
+                            appName = repository.name,
+                            stage = stage,
+                            read = DataSize(progress),
+                            total = total?.let { DataSize(it) }
+                        )
+                    )
+                }
+            }
+            passedHasUpdates = when (response) {
+                is Result.Error -> {
+                    response.exception?.let {
+                        it.printStackTrace()
+                        if (task.manual) showNotificationError(repository, it as Exception)
+                    }
+                    response.data == true || hasUpdates
+                }
+
+                is Result.Success -> response.data || hasUpdates
+            }
+        } finally {
+            withContext(NonCancellable) {
+                lock.withLock { currentTask = null }
+                handleNextTask(passedHasUpdates)
+            }
+        }
+    }
+
+    private suspend fun handleUpdates(
+        hasUpdates: Boolean,
+        notifyUpdates: Boolean,
+        autoUpdate: Boolean,
+        skipSignature: Boolean,
+    ) {
+        try {
+            if (!hasUpdates) {
+                syncState.emit(State.Finish)
+                val needStop = started == Started.MANUAL
+                started = Started.NO
+                if (needStop) stopForegroundCompat()
+                return
+            }
+            val blocked = updateNotificationBlockerFragment?.get()?.isAdded == true
+            val updates = Database.ProductAdapter.getUpdates(skipSignature)
+            if (!blocked && updates.isNotEmpty()) {
+                if (notifyUpdates) displayUpdatesNotification(updates)
+                if (autoUpdate) updateAllAppsInternal(skipSignature)
+            }
+            handleUpdates(
+                hasUpdates = false,
+                notifyUpdates = notifyUpdates,
+                autoUpdate = autoUpdate,
+                skipSignature = skipSignature,
+            )
+        } finally {
+            withContext(NonCancellable) {
+                lock.withLock { currentTask = null }
+                handleNextTask(false)
+            }
+        }
+    }
+
+    private suspend fun updateAllAppsInternal(skipSignature: Boolean) {
+        Database.ProductAdapter
+            .getUpdates(skipSignature)
+            // Update Droid-ify the last
+            .sortedBy { if (it.packageName == packageName) 1 else -1 }
+            .map {
+                Database.InstalledAdapter.get(it.packageName, null) to
+                    Database.RepositoryAdapter.get(it.repositoryId)
+            }
+            .filter { it.first != null && it.second != null }
+            .forEach { (installItem, repo) ->
+                val productRepo = Database.ProductAdapter.get(installItem!!.packageName, null)
+                    .filter { it.repositoryId == repo!!.id }
+                    .map { it to repo!! }
+                downloadConnection.startUpdate(
+                    installItem.packageName,
+                    installItem,
+                    productRepo
+                )
+            }
+    }
+
+    private fun displayUpdatesNotification(productItems: List<ProductItem>) {
+        notificationManager?.notify(
+            Constants.NOTIFICATION_ID_UPDATES,
+            NotificationCompat
+                .Builder(this, Constants.NOTIFICATION_CHANNEL_UPDATES)
+                .setSmallIcon(R.drawable.ic_new_releases)
+                .setContentTitle(getString(stringRes.new_updates_available))
+                .setContentText(
+                    resources.getQuantityString(
+                        R.plurals.new_updates_DESC_FORMAT,
+                        productItems.size,
+                        productItems.size
+                    )
+                )
+                .setColor(
+                    ContextThemeWrapper(this, styleRes.Theme_Main_Light)
+                        .getColorFromAttr(AndroidR.attr.colorPrimary).defaultColor
+                )
+                .setContentIntent(
+                    PendingIntent.getActivity(
+                        this,
+                        0,
+                        Intent(this, MainActivity::class.java)
+                            .setAction(MainActivity.ACTION_UPDATES),
+                        PendingIntent.FLAG_UPDATE_CURRENT or PendingIntent.FLAG_IMMUTABLE
+                    )
+                )
+                .setStyle(
+                    NotificationCompat.InboxStyle().also {
+                        for (productItem in productItems.take(MAX_UPDATE_NOTIFICATION)) {
+                            val builder = SpannableStringBuilder(productItem.name)
+                            builder.setSpan(
+                                ForegroundColorSpan(Color.BLACK),
+                                0,
+                                builder.length,
+                                SpannableStringBuilder.SPAN_EXCLUSIVE_EXCLUSIVE
+                            )
+                            builder.append(' ').append(productItem.version)
+                            it.addLine(builder)
+                        }
+                        if (productItems.size > MAX_UPDATE_NOTIFICATION) {
+                            val summary =
+                                getString(
+                                    stringRes.plus_more_FORMAT,
+                                    productItems.size - MAX_UPDATE_NOTIFICATION
+                                )
+                            if (SdkCheck.isNougat) {
+                                it.addLine(summary)
+                            } else {
+                                it.setSummaryText(summary)
+                            }
+                        }
+                    }
+                )
+                .build()
+        )
+    }
+
+    @SuppressLint("SpecifyJobSchedulerIdRange")
+    class Job : JobService() {
+        private val jobScope = CoroutineScope(Dispatchers.Default)
+        private var syncParams: JobParameters? = null
+        private val syncConnection =
+            Connection(SyncService::class.java, onBind = { connection, binder ->
+                jobScope.launch {
+                    binder.state.filter { it is State.Finish }.collect {
+                        val params = syncParams
+                        if (params != null) {
+                            syncParams = null
+                            connection.unbind(this@Job)
+                            jobFinished(params, false)
+                        }
+                    }
+                }
+                binder.sync(SyncRequest.AUTO)
+            }, onUnbind = { _, binder ->
+                binder.cancelAuto()
+                jobScope.cancel()
+                val params = syncParams
+                if (params != null) {
+                    syncParams = null
+                    jobFinished(params, true)
+                }
+            })
+
+        override fun onStartJob(params: JobParameters): Boolean {
+            syncParams = params
+            syncConnection.bind(this)
+            return true
+        }
+
+        override fun onStopJob(params: JobParameters): Boolean {
+            syncParams = null
+            jobScope.cancel()
+            val reschedule = syncConnection.binder?.cancelAuto() == true
+            syncConnection.unbind(this)
+            return reschedule
+        }
+
+        companion object {
+            fun create(
+                context: Context,
+                periodMillis: Long,
+                networkType: Int,
+                isCharging: Boolean,
+                isBatteryLow: Boolean
+            ): JobInfo = JobInfo.Builder(
+                Constants.JOB_ID_SYNC,
+                ComponentName(context, Job::class.java)
+            ).apply {
+                setRequiredNetworkType(networkType)
+                sdkAbove(sdk = Build.VERSION_CODES.O) {
+                    setRequiresCharging(isCharging)
+                    setRequiresBatteryNotLow(isBatteryLow)
+                    setRequiresStorageNotLow(true)
+                }
+                if (SdkCheck.isNougat) {
+                    setPeriodic(periodMillis, JobInfo.getMinFlexMillis())
+                } else {
+                    setPeriodic(periodMillis)
+                }
+            }.build()
+        }
+    }
+}

app/src/main/kotlin/com/looker/droidify/sync/IndexValidator.kt

@@ -0,0 +1,15 @@
+package com.looker.droidify.sync
+
+import com.looker.droidify.domain.model.Fingerprint
+import com.looker.droidify.network.validation.ValidationException
+import java.util.jar.JarEntry
+
+interface IndexValidator {
+
+    @Throws(ValidationException::class)
+    suspend fun validate(
+        jarEntry: JarEntry,
+        expectedFingerprint: Fingerprint?,
+    ): Fingerprint
+
+}

app/src/main/kotlin/com/looker/droidify/sync/Parser.kt

@@ -0,0 +1,14 @@
+package com.looker.droidify.sync
+
+import com.looker.droidify.domain.model.Fingerprint
+import com.looker.droidify.domain.model.Repo
+import java.io.File
+
+interface Parser<out T> {
+
+    suspend fun parse(
+        file: File,
+        repo: Repo,
+    ): Pair<Fingerprint, T>
+
+}

app/src/main/kotlin/com/looker/droidify/sync/SyncPreference.kt

@@ -0,0 +1,23 @@
+package com.looker.droidify.sync
+
+import android.app.job.JobInfo
+import androidx.work.Constraints
+import androidx.work.NetworkType
+
+data class SyncPreference(
+    val networkType: NetworkType,
+    val pluggedIn: Boolean = false,
+    val batteryNotLow: Boolean = true,
+)
+
+fun SyncPreference.toJobNetworkType() = when (networkType) {
+    NetworkType.NOT_REQUIRED -> JobInfo.NETWORK_TYPE_NONE
+    NetworkType.UNMETERED -> JobInfo.NETWORK_TYPE_UNMETERED
+    else -> JobInfo.NETWORK_TYPE_ANY
+}
+
+fun SyncPreference.toWorkConstraints(): Constraints = Constraints(
+    requiredNetworkType = networkType,
+    requiresCharging = pluggedIn,
+    requiresBatteryNotLow = batteryNotLow
+)

app/src/main/kotlin/com/looker/droidify/sync/Syncable.kt

@@ -0,0 +1,20 @@
+package com.looker.droidify.sync
+
+import com.looker.droidify.domain.model.Fingerprint
+import com.looker.droidify.domain.model.Repo
+
+/**
+ * Expected Architecture: [https://excalidraw.com/#json=JqpGunWTJONjq-ecDNiPg,j9t0X4coeNvIG7B33GTq6A]
+ *
+ * Current Issue: When downloading entry.jar we need to re-call the synchronizer,
+ * which this arch doesn't allow.
+ */
+interface Syncable<T> {
+
+    val parser: Parser<T>
+
+    suspend fun sync(
+        repo: Repo,
+    ): Pair<Fingerprint, com.looker.droidify.sync.v2.model.IndexV2?>
+
+}

app/src/main/kotlin/com/looker/droidify/sync/common/IndexConverter.kt

@@ -0,0 +1,248 @@
+package com.looker.droidify.sync.common
+
+import com.looker.droidify.sync.v1.model.AppV1
+import com.looker.droidify.sync.v1.model.IndexV1
+import com.looker.droidify.sync.v1.model.Localized
+import com.looker.droidify.sync.v1.model.PackageV1
+import com.looker.droidify.sync.v1.model.RepoV1
+import com.looker.droidify.sync.v1.model.maxSdk
+import com.looker.droidify.sync.v1.model.name
+import com.looker.droidify.sync.v2.model.AntiFeatureV2
+import com.looker.droidify.sync.v2.model.CategoryV2
+import com.looker.droidify.sync.v2.model.FeatureV2
+import com.looker.droidify.sync.v2.model.FileV2
+import com.looker.droidify.sync.v2.model.IndexV2
+import com.looker.droidify.sync.v2.model.LocalizedFiles
+import com.looker.droidify.sync.v2.model.LocalizedIcon
+import com.looker.droidify.sync.v2.model.LocalizedString
+import com.looker.droidify.sync.v2.model.ManifestV2
+import com.looker.droidify.sync.v2.model.MetadataV2
+import com.looker.droidify.sync.v2.model.MirrorV2
+import com.looker.droidify.sync.v2.model.PackageV2
+import com.looker.droidify.sync.v2.model.PermissionV2
+import com.looker.droidify.sync.v2.model.RepoV2
+import com.looker.droidify.sync.v2.model.ScreenshotsV2
+import com.looker.droidify.sync.v2.model.SignerV2
+import com.looker.droidify.sync.v2.model.UsesSdkV2
+import com.looker.droidify.sync.v2.model.VersionV2
+
+private const val V1_LOCALE = "en-US"
+
+internal fun IndexV1.toV2(): IndexV2 {
+    val antiFeatures: MutableList<String> = mutableListOf()
+    val categories: MutableList<String> = mutableListOf()
+
+    val packagesV2: HashMap<String, PackageV2> = hashMapOf()
+
+    apps.forEach { app ->
+        antiFeatures.addAll(app.antiFeatures)
+        categories.addAll(app.categories)
+        val versions = packages[app.packageName]
+        val preferredSigner = versions?.firstOrNull()?.signer
+        val whatsNew: LocalizedString? = app.localized
+            ?.localizedString(null) { it.whatsNew }
+        val packageV2 = PackageV2(
+            versions = versions?.associate { packageV1 ->
+                packageV1.hash to packageV1.toVersionV2(
+                    whatsNew = whatsNew,
+                    packageAntiFeatures = app.antiFeatures + (packageV1.antiFeatures ?: emptyList())
+                )
+            } ?: emptyMap(),
+            metadata = app.toV2(preferredSigner)
+        )
+        packagesV2.putIfAbsent(app.packageName, packageV2)
+    }
+
+    return IndexV2(
+        repo = repo.toRepoV2(
+            categories = categories,
+            antiFeatures = antiFeatures
+        ),
+        packages = packagesV2,
+    )
+}
+
+private fun RepoV1.toRepoV2(
+    categories: List<String>,
+    antiFeatures: List<String>,
+): RepoV2 = RepoV2(
+    address = address,
+    timestamp = timestamp,
+    icon = mapOf(V1_LOCALE to FileV2("/icons/$icon")),
+    name = mapOf(V1_LOCALE to name),
+    description = mapOf(V1_LOCALE to description),
+    mirrors = mirrors.toMutableList()
+        .apply { add(0, address) }
+        .map { MirrorV2(url = it, isPrimary = (it == address).takeIf { it }) },
+    antiFeatures = antiFeatures.associateWith { name ->
+        AntiFeatureV2(
+            name = mapOf(V1_LOCALE to name),
+            icon = mapOf(V1_LOCALE to FileV2("/icons/ic_antifeature_${name.normalizeName()}.png")),
+        )
+    },
+    categories = categories.associateWith { name ->
+        CategoryV2(
+            name = mapOf(V1_LOCALE to name),
+            icon = mapOf(V1_LOCALE to FileV2("/icons/category_${name.normalizeName()}.png")),
+        )
+    },
+)
+
+private fun String.normalizeName(): String = lowercase().replace(" & ", "_")
+
+private fun AppV1.toV2(preferredSigner: String?): MetadataV2 = MetadataV2(
+    added = added ?: 0L,
+    lastUpdated = lastUpdated ?: 0L,
+    icon = localized?.localizedIcon(packageName, icon) { it.icon },
+    name = localized?.localizedString(name) { it.name },
+    description = localized?.localizedString(description) { it.description },
+    summary = localized?.localizedString(summary) { it.summary },
+    authorEmail = authorEmail,
+    authorName = authorName,
+    authorPhone = authorPhone,
+    authorWebSite = authorWebSite,
+    bitcoin = bitcoin,
+    categories = categories,
+    changelog = changelog,
+    donate = if (donate != null) listOf(donate) else emptyList(),
+    featureGraphic = localized?.localizedIcon(packageName) { it.featureGraphic },
+    flattrID = flattrID,
+    issueTracker = issueTracker,
+    liberapay = liberapay,
+    license = license,
+    litecoin = litecoin,
+    openCollective = openCollective,
+    preferredSigner = preferredSigner,
+    promoGraphic = localized?.localizedIcon(packageName) { it.promoGraphic },
+    screenshots = localized?.screenshotV2(packageName),
+    sourceCode = sourceCode,
+    translation = translation,
+    tvBanner = localized?.localizedIcon(packageName) { it.tvBanner },
+    video = localized?.localizedString(null) { it.video },
+    webSite = webSite,
+)
+
+private fun Map<String, Localized>.screenshotV2(
+    packageName: String,
+): ScreenshotsV2? = ScreenshotsV2(
+    phone = localizedScreenshots { locale, screenshot ->
+        screenshot.phoneScreenshots?.map {
+            "/$packageName/$locale/phoneScreenshots/$it"
+        }
+    },
+    sevenInch = localizedScreenshots { locale, screenshot ->
+        screenshot.sevenInchScreenshots?.map {
+            "/$packageName/$locale/sevenInchScreenshots/$it"
+        }
+    },
+    tenInch = localizedScreenshots { locale, screenshot ->
+        screenshot.tenInchScreenshots?.map {
+            "/$packageName/$locale/tenInchScreenshots/$it"
+        }
+    },
+    tv = localizedScreenshots { locale, screenshot ->
+        screenshot.tvScreenshots?.map {
+            "/$packageName/$locale/tvScreenshots/$it"
+        }
+    },
+    wear = localizedScreenshots { locale, screenshot ->
+        screenshot.wearScreenshots?.map {
+            "/$packageName/$locale/wearScreenshots/$it"
+        }
+    },
+).takeIf { !it.isNull }
+
+private fun PackageV1.toVersionV2(
+    whatsNew: LocalizedString?,
+    packageAntiFeatures: List<String>,
+): VersionV2 = VersionV2(
+    added = added ?: 0L,
+    file = FileV2(
+        name = "/$apkName",
+        sha256 = hash,
+        size = size,
+    ),
+    src = srcName?.let { FileV2("/$it") },
+    whatsNew = whatsNew ?: emptyMap(),
+    antiFeatures = packageAntiFeatures.associateWith { mapOf(V1_LOCALE to it) },
+    manifest = ManifestV2(
+        versionName = versionName,
+        versionCode = versionCode ?: 0L,
+        signer = signer?.let { SignerV2(listOf(it)) },
+        usesSdk = sdkV2(),
+        maxSdkVersion = maxSdkVersion,
+        usesPermission = usesPermission.map { PermissionV2(it.name, it.maxSdk) },
+        usesPermissionSdk23 = usesPermission23.map { PermissionV2(it.name, it.maxSdk) },
+        features = features?.map { FeatureV2(it) } ?: emptyList(),
+        nativecode = nativeCode ?: emptyList()
+    ),
+)
+
+private fun PackageV1.sdkV2(): UsesSdkV2? {
+    return if (minSdkVersion == null && targetSdkVersion == null) {
+        null
+    } else {
+        UsesSdkV2(
+            minSdkVersion = minSdkVersion ?: 1,
+            targetSdkVersion = targetSdkVersion ?: 1,
+        )
+    }
+}
+
+private inline fun Map<String, Localized>.localizedString(
+    default: String?,
+    crossinline block: (Localized) -> String?,
+): LocalizedString? {
+    // Because top level fields are null if there are localized fields underneath
+    // Turns out no
+    if (isEmpty() && default != null) {
+        return mapOf(V1_LOCALE to default)
+    }
+    val checkDefault = get(V1_LOCALE)?.let { block(it) }
+    if (checkDefault == null && default != null) {
+        return mapOf(V1_LOCALE to default)
+    }
+    return mapValuesNotNull { (_, localized) ->
+        block(localized)
+    }.takeIf { it.isNotEmpty() }
+}
+
+
+private inline fun Map<String, Localized>.localizedIcon(
+    packageName: String,
+    default: String? = null,
+    crossinline block: (Localized) -> String?,
+): LocalizedIcon? {
+    if (isEmpty() && default != null) {
+        return mapOf(V1_LOCALE to FileV2("/icons/$default"))
+    }
+    val checkDefault = get(V1_LOCALE)?.let { block(it) }
+    if (checkDefault == null && default != null) {
+        return mapOf(V1_LOCALE to FileV2("/icons/$default"))
+    }
+    return mapValuesNotNull { (locale, localized) ->
+        block(localized)?.let {
+            FileV2("/$packageName/$locale/$it")
+        }
+    }.takeIf { it.isNotEmpty() }
+}
+
+private inline fun Map<String, Localized>.localizedScreenshots(
+    crossinline block: (String, Localized) -> List<String>?,
+): LocalizedFiles? {
+    return mapValuesNotNull { (locale, localized) ->
+        val files = block(locale, localized)
+        if (files.isNullOrEmpty()) null
+        else files.map(::FileV2)
+    }.takeIf { it.isNotEmpty() }
+}
+
+private inline fun <K, V, M> Map<K, V>.mapValuesNotNull(
+    block: (Map.Entry<K, V>) -> M?
+): Map<K, M> {
+    val map = HashMap<K, M>()
+    forEach { entry ->
+        block(entry)?.let { map[entry.key] = it }
+    }
+    return map
+}

app/src/main/kotlin/com/looker/droidify/sync/common/IndexDownloader.kt

@@ -0,0 +1,40 @@
+package com.looker.droidify.sync.common
+
+import android.content.Context
+import com.looker.droidify.utility.common.cache.Cache
+import com.looker.droidify.domain.model.Repo
+import com.looker.droidify.network.Downloader
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.withContext
+import java.io.File
+import java.util.Date
+
+suspend fun Downloader.downloadIndex(
+    context: Context,
+    repo: Repo,
+    fileName: String,
+    url: String,
+    diff: Boolean = false,
+): File = withContext(Dispatchers.IO) {
+    val tempFile = Cache.getIndexFile(context, "repo_${repo.id}_$fileName")
+    downloadToFile(
+        url = url,
+        target = tempFile,
+        headers = {
+            if (repo.shouldAuthenticate) {
+                authentication(
+                    repo.authentication.username,
+                    repo.authentication.password
+                )
+            }
+            if (repo.versionInfo.timestamp > 0L && !diff) {
+                ifModifiedSince(Date(repo.versionInfo.timestamp))
+            }
+        }
+    )
+    tempFile
+}
+
+const val INDEX_V1_NAME = "index-v1.jar"
+const val ENTRY_V2_NAME = "entry.jar"
+const val INDEX_V2_NAME = "index-v2.json"

app/src/main/kotlin/com/looker/droidify/sync/common/IndexJarValidator.kt

@@ -0,0 +1,43 @@
+package com.looker.droidify.sync.common
+
+import com.looker.droidify.domain.model.Fingerprint
+import com.looker.droidify.domain.model.check
+import com.looker.droidify.domain.model.fingerprint
+import com.looker.droidify.network.validation.invalid
+import com.looker.droidify.sync.utils.certificate
+import com.looker.droidify.sync.utils.codeSigner
+import kotlinx.coroutines.CoroutineDispatcher
+import kotlinx.coroutines.withContext
+import java.util.jar.JarEntry
+
+class IndexJarValidator(
+    private val dispatcher: CoroutineDispatcher
+) : com.looker.droidify.sync.IndexValidator {
+    override suspend fun validate(
+        jarEntry: JarEntry,
+        expectedFingerprint: Fingerprint?
+    ): Fingerprint = withContext(dispatcher) {
+        val fingerprint = try {
+            jarEntry
+                .codeSigner
+                .certificate
+                .fingerprint()
+        } catch (e: IllegalStateException) {
+            invalid(e.message ?: "Unknown Exception")
+        } catch (e: IllegalArgumentException) {
+            invalid(e.message ?: "Error creating Fingerprint object")
+        }
+        if (expectedFingerprint == null) {
+            fingerprint
+        } else {
+            if (expectedFingerprint.check(fingerprint)) {
+                expectedFingerprint
+            } else {
+                invalid(
+                    "Expected Fingerprint: ${expectedFingerprint}, " +
+                        "Acquired Fingerprint: $fingerprint"
+                )
+            }
+        }
+    }
+}

app/src/main/kotlin/com/looker/droidify/sync/common/JsonParser.kt

@@ -0,0 +1,9 @@
+package com.looker.droidify.sync.common
+
+import kotlinx.serialization.json.Json
+
+val JsonParser = Json {
+    ignoreUnknownKeys = true
+    coerceInputValues = true
+    isLenient = true
+}