feat: add plasma-face-unlock

src/daemon/client.cpp

@@ -0,0 +1,82 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#include "client.h"
+
+#include <QJsonDocument>
+
+#include <sys/socket.h>
+
+namespace
+{
+// A request is a line of JSON a few hundred bytes long. Anything that keeps
+// talking without a newline for this long is not a client.
+constexpr qsizetype MaxLine = 64 * 1024;
+} // namespace
+
+Client::Client(QLocalSocket *socket, QObject *parent)
+    : QObject(parent)
+    , m_socket(socket)
+{
+    m_socket->setParent(this);
+
+    ucred cred{};
+    socklen_t len = sizeof(cred);
+    if (::getsockopt(int(m_socket->socketDescriptor()), SOL_SOCKET, SO_PEERCRED, &cred, &len) == 0) {
+        m_uid = cred.uid;
+        m_pid = cred.pid;
+        m_known = true;
+    }
+
+    connect(m_socket, &QLocalSocket::readyRead, this, &Client::readLines);
+    connect(m_socket, &QLocalSocket::disconnected, this, [this] {
+        if (!m_gone) {
+            m_gone = true;
+            Q_EMIT disconnected(this);
+        }
+    });
+}
+
+Client::~Client() = default;
+
+void Client::readLines()
+{
+    m_buffer += m_socket->readAll();
+    if (m_buffer.size() > MaxLine && !m_buffer.contains('\n')) {
+        close();
+        return;
+    }
+
+    qsizetype nl;
+    while ((nl = m_buffer.indexOf('\n')) >= 0) {
+        const QByteArray line = m_buffer.left(nl).trimmed();
+        m_buffer.remove(0, nl + 1);
+        if (line.isEmpty()) {
+            continue;
+        }
+        const QJsonDocument doc = QJsonDocument::fromJson(line);
+        if (!doc.isObject()) {
+            send({{QStringLiteral("event"), QStringLiteral("result")},
+                  {QStringLiteral("ok"), false},
+                  {QStringLiteral("reason"), QStringLiteral("bad-request")}});
+            continue;
+        }
+        Q_EMIT request(this, doc.object());
+    }
+}
+
+void Client::send(const QJsonObject &message)
+{
+    if (m_gone || m_socket->state() != QLocalSocket::ConnectedState) {
+        return;
+    }
+    m_socket->write(QJsonDocument(message).toJson(QJsonDocument::Compact) + '\n');
+    m_socket->flush();
+}
+
+void Client::close()
+{
+    if (m_socket->state() == QLocalSocket::ConnectedState) {
+        m_socket->flush();
+        m_socket->disconnectFromServer();
+    }
+}