The Tor Browser: mobile/android/base/OrderedBroadcastHelper.java@fc2d59ddac77

     1 /* -*- Mode: Java; c-basic-offset: 4; tab-width: 20; indent-tabs-mode: nil; -*-

     2  * This Source Code Form is subject to the terms of the Mozilla Public

     3  * License, v. 2.0. If a copy of the MPL was not distributed with this

     4  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

     6 package org.mozilla.gecko;

     8 import org.mozilla.gecko.background.common.GlobalConstants;

     9 import org.mozilla.gecko.EventDispatcher;

    10 import org.mozilla.gecko.util.GeckoEventListener;

    12 import org.json.JSONException;

    13 import org.json.JSONObject;

    15 import android.app.Activity;

    17 import android.content.BroadcastReceiver;

    18 import android.content.Context;

    19 import android.content.Intent;

    21 import android.util.Log;

    23 /**

    24  * Helper class to send Android Ordered Broadcasts.

    25  */

    26 public final class OrderedBroadcastHelper

    27              implements GeckoEventListener

    28 {

    29     public static final String LOGTAG = "GeckoOrdBroadcast";

    31     public static final String SEND_EVENT = "OrderedBroadcast:Send";

    33     protected final Context mContext;

    35     public OrderedBroadcastHelper(Context context) {

    36         mContext = context;

    38         EventDispatcher dispatcher = GeckoAppShell.getEventDispatcher();

    39         if (dispatcher == null) {

    40             Log.e(LOGTAG, "Gecko event dispatcher must not be null", new RuntimeException());

    41             return;

    42         }

    43         dispatcher.registerEventListener(SEND_EVENT, this);

    44     }

    46     public synchronized void uninit() {

    47         EventDispatcher dispatcher = GeckoAppShell.getEventDispatcher();

    48         if (dispatcher == null) {

    49             Log.e(LOGTAG, "Gecko event dispatcher must not be null", new RuntimeException());

    50             return;

    51         }

    52         dispatcher.unregisterEventListener(SEND_EVENT, this);

    53     }

    55     @Override

    56     public void handleMessage(String event, JSONObject message) {

    57         if (!SEND_EVENT.equals(event)) {

    58             Log.e(LOGTAG, "OrderedBroadcastHelper got unexpected message " + event);

    59             return;

    60         }

    62         try {

    63             final String action = message.getString("action");

    64             if (action == null) {

    65                 Log.e(LOGTAG, "action must not be null");

    66                 return;

    67             }

    69             final String responseEvent = message.getString("responseEvent");

    70             if (responseEvent == null) {

    71                 Log.e(LOGTAG, "responseEvent must not be null");

    72                 return;

    73             }

    75             // It's fine if the caller-provided token is missing or null.

    76             final JSONObject token = (message.has("token") && !message.isNull("token")) ?

    77                 message.getJSONObject("token") : null;

    79             // A missing (undefined) permission means the intent will be limited

    80             // to the current package. A null means no permission, so any

    81             // package can receive the intent.

    82             final String permission = message.has("permission") ?

    83                                       (message.isNull("permission") ? null : message.getString("permission")) :

    84                                       GlobalConstants.PER_ANDROID_PACKAGE_PERMISSION;

    86             final BroadcastReceiver resultReceiver = new BroadcastReceiver() {

    87                 @Override

    88                 public void onReceive(Context context, Intent intent) {

    89                     int code = getResultCode();

    91                     if (code == Activity.RESULT_OK) {

    92                         String data = getResultData();

    94                         JSONObject res = new JSONObject();

    95                         try {

    96                             res.put("action", action);

    97                             res.put("token", token);

    98                             res.put("data", data);

    99                         } catch (JSONException e) {

   100                             Log.e(LOGTAG, "Got exception in onReceive handling action " + action, e);

   101                             return;

   102                         }

   104                         GeckoEvent event = GeckoEvent.createBroadcastEvent(responseEvent, res.toString());

   105                         GeckoAppShell.sendEventToGecko(event);

   106                     }

   107                 }

   108             };

   110             Intent intent = new Intent(action);

   111             // OrderedBroadcast.jsm adds its callback ID to the caller's token;

   112             // this unwraps that wrapping.

   113             if (token != null && token.has("data")) {

   114                 intent.putExtra("token", token.getString("data"));

   115             }

   117             mContext.sendOrderedBroadcast(intent,

   118                                           permission,

   119                                           resultReceiver,

   120                                           null,

   121                                           Activity.RESULT_OK,

   122                                           null,

   123                                           null);

   124         } catch (JSONException e) {

   125             Log.e(LOGTAG, "Got exception in handleMessage handling event " + event, e);

   126             return;

   127         }

   128     }

   129 }

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