Proxy configurators

src/org/adblockplus/android/configurators/ManualProxyConfigurator.java

+/*
+ * This file is part of Adblock Plus <http://adblockplus.org/>,
+ * Copyright (C) 2006-2014 Eyeo GmbH
+ *
+ * Adblock Plus is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 3 as
+ * published by the Free Software Foundation.
+ *
+ * Adblock Plus is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Adblock Plus.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package org.adblockplus.android.configurators;
+
+import java.net.InetAddress;
+import java.util.concurrent.Semaphore;
+import java.util.concurrent.locks.ReentrantLock;
+
+import org.adblockplus.android.ConfigurationActivity;
+import org.adblockplus.android.ProxyService;
+import org.adblockplus.android.R;
+import org.adblockplus.android.compat.ProxyProperties;
+import org.adblockplus.brazil.RequestHandler;
+
+import android.app.NotificationManager;
+import android.app.PendingIntent;
+import android.content.Context;
+import android.content.Intent;
+import android.os.Handler;
+import android.support.v4.app.NotificationCompat;
+
+/**
+ * A dummy registrator only holding callbacks and checks.
+ */
+public class ManualProxyConfigurator implements ProxyConfigurator
+{
+  final Context context;
+  private ProxyProperties proxyProperties = null;
+  private static final int NOTRAFFIC_NOTIFICATION_ID = R.string.proxysettings_name;
+  private static final int NO_TRAFFIC_TIMEOUT = 5 * 60 * 1000; // 5 minutes
+  private volatile boolean isRegistered = false;
+  private NoTrafficWorker noTrafficWorker = null;
+  private final ReentrantLock noTrafficAccessLock = new ReentrantLock();
+  private final Handler uiHandler;
+
+  public ManualProxyConfigurator(final Context context)
+  {
+    this.uiHandler = new Handler();
+    this.context = context;
+  }
+
+  @Override
+  public boolean initialize()
+  {
+    return true;
+  }
+
+  @Override
+  public boolean registerProxy(final InetAddress address, final int port)
+  {
+    this.proxyProperties = new ProxyProperties(address.getHostName(), port, "");
+    this.startNoTrafficCheck();
+    return true;
+  }
+
+  @Override
+  public void unregisterProxy()
+  {
+    this.isRegistered = false;
+    this.abortNoTrafficCheck();
+  }
+
+  @Override
+  public void shutdown()
+  {
+    this.removeErrorNotification();
+  }
+
+  @Override
+  public ProxyRegistrationType getType()
+  {
+    return ProxyRegistrationType.MANUAL;
+  }
+
+  @Override
+  public boolean isRegistered()
+  {
+    return this.isRegistered;
+  }
+
+  @Override
+  public boolean isSticky()
+  {
+    return true;
+  }
+
+  @Override
+  public String toString()
+  {
+    return "[ProxyConfigurator: " + this.getType() + "]";
+  }
+
+  private void removeErrorNotification()
+  {
+    final NotificationManager notificationManager =
+        (NotificationManager) this.context.getSystemService(Context.NOTIFICATION_SERVICE);
+    notificationManager.cancel(NOTRAFFIC_NOTIFICATION_ID);
+  }
+
+  private void startNoTrafficCheck()
+  {
+    this.noTrafficAccessLock.lock();
+    try
+    {
+      if (this.noTrafficWorker == null)
+      {
+        this.noTrafficWorker = new NoTrafficWorker(this);
+        final Thread t = new Thread(this.noTrafficWorker);
+        t.setDaemon(true);
+        t.start();
+      }
+    }
+    finally
+    {
+      this.noTrafficAccessLock.unlock();
+    }
+  }
+
+  private void abortNoTrafficCheck()
+  {
+    this.noTrafficAccessLock.lock();
+    try
+    {
+      if (this.noTrafficWorker != null)
+      {
+        this.noTrafficWorker.stop();
+      }
+    }
+    finally
+    {
+      this.noTrafficWorker = null;
+      this.noTrafficAccessLock.unlock();
+    }
+  }
+
+  private synchronized void trafficReceived()
+  {
+    this.isRegistered = true;
+    this.abortNoTrafficCheck();
+
+    this.uiHandler.post(new Runnable()
+    {
+      @Override
+      public void run()
+      {
+        ManualProxyConfigurator.this.removeErrorNotification();
+        ManualProxyConfigurator.this.context.sendBroadcast(new Intent(ProxyService.PROXY_STATE_CHANGED_ACTION));
+      }
+    });
+  }
+
+  private synchronized void noTrafficReceived()
+  {
+    this.isRegistered = false;
+    this.abortNoTrafficCheck();
+
+    this.uiHandler.post(new Runnable()
+    {
+      @Override
+      public void run()
+      {
+        final Context context = ManualProxyConfigurator.this.context;
+        // Show warning notification
+        final Intent intent =
+            new Intent(context, ConfigurationActivity.class)
+                .addFlags(Intent.FLAG_ACTIVITY_NEW_TASK)
+                .putExtra("port", ManualProxyConfigurator.this.proxyProperties.getPort());
+
+        final PendingIntent contentIntent =
+            PendingIntent.getActivity(context, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT);
+
+        final NotificationCompat.Builder builder =
+            new NotificationCompat.Builder(context)
+                .setSmallIcon(R.drawable.ic_stat_warning)
+                .setWhen(System.currentTimeMillis())
+                .setAutoCancel(true)
+                .setContentIntent(contentIntent)
+                .setContentTitle(context.getText(R.string.app_name))
+                .setContentText(context.getText(R.string.notif_notraffic));
+
+        final NotificationManager notificationManager = (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);
+        notificationManager.notify(NOTRAFFIC_NOTIFICATION_ID, builder.getNotification());
+
+        context.sendBroadcast(new Intent(ProxyService.PROXY_STATE_CHANGED_ACTION));
+      }
+    });
+  }
+
+  private static class NoTrafficWorker implements Runnable
+  {
+    private volatile boolean running = true;
+    private final Semaphore finished = new Semaphore(1);
+    private final ManualProxyConfigurator manualProxyConfigurator;
+
+    public NoTrafficWorker(final ManualProxyConfigurator manualProxyConfigurator)
+    {
+      this.manualProxyConfigurator = manualProxyConfigurator;
+      this.finished.acquireUninterruptibly();
+    }
+
+    @Override
+    public void run()
+    {
+      try
+      {
+        final long endTime = System.currentTimeMillis() + NO_TRAFFIC_TIMEOUT;
+
+        final long blockedStart = RequestHandler.getBlockedRequestCount();
+        final long unblockedStart = RequestHandler.getUnblockedRequestCount();
+
+        while (this.running)
+        {
+          try
+          {
+            if (System.currentTimeMillis() >= endTime)
+            {
+              this.running = false;
+              this.manualProxyConfigurator.noTrafficReceived();
+              break;
+            }
+
+            if (RequestHandler.getBlockedRequestCount() != blockedStart
+                || RequestHandler.getUnblockedRequestCount() != unblockedStart)
+            {
+              this.running = false;
+              this.manualProxyConfigurator.trafficReceived();
+              break;
+            }
+
+            Thread.sleep(100);
+          }
+          catch (final Throwable t)
+          {
+            // Swallow everything to keep this thread alive at all cost
+          }
+        }
+      }
+      finally
+      {
+        this.finished.release();
+      }
+    }
+
+    public synchronized void stop()
+    {
+      if (this.running)
+      {
+        this.running = false;
+        this.finished.acquireUninterruptibly();
+      }
+    }
+  }
+}