ABP/Android proxy service

src/org/adblockplus/android/ProxySettings.java

Index: src/org/adblockplus/android/ProxySettings.java
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+++ b/src/org/adblockplus/android/ProxySettings.java
@@ -0,0 +1,194 @@
+package org.adblockplus.android;
+
+import java.lang.reflect.Constructor;
+import java.lang.reflect.Method;
+
+import android.content.Context;
+import android.content.Intent;
+import android.net.ConnectivityManager;
+import android.net.NetworkInfo;
+import android.os.Parcelable;
+import android.util.Log;
+
+public class ProxySettings
+{
+  private static final String TAG = "ProxySettings";
+  
+  /**
+   * Reads system proxy settings on Android 3.1+ using Java reflection.
+   * 
+   * @return string array of host, port and exclusion list
+   */
+  public static String[] getUserProxy(Context context)
+  {
+    Method method = null;
+    try
+    {
+      /*
+       * ProxyProperties proxyProperties = ConnectivityManager.getProxy();
+       */
+      method = ConnectivityManager.class.getMethod("getProxy");
+    }
+    catch (NoSuchMethodException e)
+    {
+      // This is normal situation for pre-ICS devices
+      return null;
+    }
+    catch (Exception e)
+    {
+      // This should not happen
+      Log.e(TAG, "getProxy failure", e);
+      return null;
+    }
+
+    try
+    {
+      ConnectivityManager connectivityManager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
+      Object pp = method.invoke(connectivityManager);
+      if (pp == null)
+        return null;
+
+      return getUserProxy(pp);
+    }
+    catch (Exception e)
+    {
+      // This should not happen
+      Log.e(TAG, "getProxy failure", e);
+      return null;
+    }
+  }
+
+  /**
+   * Reads system proxy settings on Android 3.1+ using Java reflection.
+   * 
+   * @param pp
+   *          ProxyProperties object
+   * @return string array of host, port and exclusion list
+   * @throws Exception
+   */
+  protected static String[] getUserProxy(Object pp) throws Exception
+  {
+    String[] userProxy = new String[3];
+
+    String className = "android.net.ProxyProperties";
+    Class<?> c = Class.forName(className);
+    Method method;
+
+    /*
+     * String proxyHost = pp.getHost()
+     */
+    method = c.getMethod("getHost");
+    userProxy[0] = (String) method.invoke(pp);
+
+    /*
+     * int proxyPort = pp.getPort();
+     */
+    method = c.getMethod("getPort");
+    userProxy[1] = String.valueOf((Integer) method.invoke(pp));
+
+    /*
+     * String proxyEL = pp.getExclusionList()
+     */
+    method = c.getMethod("getExclusionList");
+    userProxy[2] = (String) method.invoke(pp);
+
+    if (userProxy[0] != null)
+      return userProxy;
+    else
+      return null;
+  }
+
+  /**
+   * Tries to set local proxy in system settings via native call on Android 3.1+
+   * devices using Java reflection.
+   * 
+   * @return true if device supports native proxy setting
+   */
+  public static boolean setConnectionProxy(Context context, String host, int port, String excl)
+  {
+    Method method = null;
+    try
+    {
+      /*
+       * android.net.LinkProperties lp =
+       * ConnectivityManager.getActiveLinkProperties();
+       */
+      method = ConnectivityManager.class.getMethod("getActiveLinkProperties");
+    }
+    catch (NoSuchMethodException e)
+    {
+      // This is normal situation for pre-ICS devices
+      return false;
+    }
+    catch (Exception e)
+    {
+      // This should not happen
+      Log.e(TAG, "setHttpProxy failure", e);
+      return false;
+    }
+    try
+    {
+      ConnectivityManager connectivityManager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
+      Object lp = method.invoke(connectivityManager);
+      if (lp == null) // There is no active link now, but device has native proxy support
+        return true;
+      
+      String className = "android.net.ProxyProperties";
+      Class<?> c = Class.forName(className);
+      method = lp.getClass().getMethod("setHttpProxy", c);
+      if (host != null)
+      {
+        /*
+         * ProxyProperties pp = new ProxyProperties(host, port, excl);
+         */
+        Class<?>[] parameter = new Class[] {String.class, int.class, String.class};
+        Object args[] = new Object[3];
+        args[0] = host;
+        args[1] = Integer.valueOf(port);
+        args[2] = excl;
+        Constructor<?> cons = c.getConstructor(parameter);
+        Object pp = cons.newInstance(args);
+        /*
+         * lp.setHttpProxy(pp);
+         */
+        method.invoke(lp, pp);
+      }
+      else
+      {
+        /*
+         * lp.setHttpProxy(null);
+         */
+        method.invoke(lp, new Object[] {null});
+      }
+
+      Intent intent = null;
+      NetworkInfo ni = connectivityManager.getActiveNetworkInfo();
+      switch (ni.getType())
+      {
+        case ConnectivityManager.TYPE_WIFI:
+          intent = new Intent("android.net.wifi.LINK_CONFIGURATION_CHANGED");
+          break;
+        case ConnectivityManager.TYPE_MOBILE:
+          // TODO We leave it here for future, it does not work now
+          // intent = new Intent("android.intent.action.ANY_DATA_STATE");
+          break;
+      }
+      if (intent != null)
+      {
+        if (lp != null)
+        {
+          intent.putExtra("linkProperties", (Parcelable) lp);
+        }
+        context.sendBroadcast(intent);
+      }
+
+      return true;
+    }
+    catch (Exception e)
+    {
+      // This should not happen
+      Log.e(TAG, "setHttpProxy failure", e);
+      return false;
+    }
+  }
+}