| /* |
| * Copyright (C) 2009 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package android.webkit; |
| |
| import android.os.Handler; |
| import android.os.Message; |
| import android.util.Log; |
| import java.util.concurrent.locks.Condition; |
| import java.util.concurrent.locks.Lock; |
| import java.util.concurrent.locks.ReentrantLock; |
| import java.util.Set; |
| |
| |
| /** |
| * Implements the Java side of GeolocationPermissions. Simply marshalls calls |
| * from the UI thread to the WebKit thread. |
| * @hide |
| */ |
| public final class GeolocationPermissions { |
| /** |
| * Callback interface used by the browser to report a Geolocation permission |
| * state set by the user in response to a permissions prompt. |
| */ |
| public interface Callback { |
| public void invoke(String origin, boolean allow, boolean remember); |
| }; |
| |
| // Log tag |
| private static final String TAG = "geolocationPermissions"; |
| |
| // Global instance |
| private static GeolocationPermissions sInstance; |
| |
| private Handler mHandler; |
| |
| // Members used to transfer the origins and permissions between threads. |
| private Set<String> mOrigins; |
| private boolean mAllowed; |
| private static Lock mLock = new ReentrantLock(); |
| private static boolean mUpdated; |
| private static Condition mUpdatedCondition = mLock.newCondition(); |
| |
| // Message ids |
| static final int GET_ORIGINS = 0; |
| static final int GET_ALLOWED = 1; |
| static final int CLEAR = 2; |
| static final int CLEAR_ALL = 3; |
| |
| /** |
| * Gets the singleton instance of the class. |
| */ |
| public static GeolocationPermissions getInstance() { |
| if (sInstance == null) { |
| sInstance = new GeolocationPermissions(); |
| } |
| return sInstance; |
| } |
| |
| /** |
| * Creates the message handler. Must be called on the WebKit thread. |
| */ |
| public void createHandler() { |
| if (mHandler == null) { |
| mHandler = new Handler() { |
| @Override |
| public void handleMessage(Message msg) { |
| // Runs on the WebKit thread. |
| switch (msg.what) { |
| case GET_ORIGINS: |
| getOriginsImpl(); |
| break; |
| case GET_ALLOWED: |
| getAllowedImpl((String) msg.obj); |
| break; |
| case CLEAR: |
| nativeClear((String) msg.obj); |
| break; |
| case CLEAR_ALL: |
| nativeClearAll(); |
| break; |
| } |
| } |
| }; |
| } |
| } |
| |
| /** |
| * Utility function to send a message to our handler. |
| */ |
| private void postMessage(Message msg) { |
| assert(mHandler != null); |
| mHandler.sendMessage(msg); |
| } |
| |
| /** |
| * Gets the set of origins for which Geolocation permissions are stored. |
| * Note that we represent the origins as strings. These are created using |
| * WebCore::SecurityOrigin::toString(). As long as all 'HTML 5 modules' |
| * (Database, Geolocation etc) do so, it's safe to match up origins for the |
| * purposes of displaying UI. |
| */ |
| public Set getOrigins() { |
| // Called on the UI thread. |
| Set origins = null; |
| mLock.lock(); |
| try { |
| mUpdated = false; |
| postMessage(Message.obtain(null, GET_ORIGINS)); |
| while (!mUpdated) { |
| mUpdatedCondition.await(); |
| } |
| origins = mOrigins; |
| } catch (InterruptedException e) { |
| Log.e(TAG, "Exception while waiting for update", e); |
| } finally { |
| mLock.unlock(); |
| } |
| return origins; |
| } |
| |
| /** |
| * Helper method to get the set of origins. |
| */ |
| private void getOriginsImpl() { |
| // Called on the WebKit thread. |
| mLock.lock(); |
| mOrigins = nativeGetOrigins(); |
| mUpdated = true; |
| mUpdatedCondition.signal(); |
| mLock.unlock(); |
| } |
| |
| /** |
| * Gets the permission state for the specified origin. |
| */ |
| public boolean getAllowed(String origin) { |
| // Called on the UI thread. |
| boolean allowed = false; |
| mLock.lock(); |
| try { |
| mUpdated = false; |
| postMessage(Message.obtain(null, GET_ALLOWED, origin)); |
| while (!mUpdated) { |
| mUpdatedCondition.await(); |
| } |
| allowed = mAllowed; |
| } catch (InterruptedException e) { |
| Log.e(TAG, "Exception while waiting for update", e); |
| } finally { |
| mLock.unlock(); |
| } |
| return allowed; |
| } |
| |
| /** |
| * Helper method to get the permission state. |
| */ |
| private void getAllowedImpl(String origin) { |
| // Called on the WebKit thread. |
| mLock.lock(); |
| mAllowed = nativeGetAllowed(origin); |
| mUpdated = true; |
| mUpdatedCondition.signal(); |
| mLock.unlock(); |
| } |
| |
| /** |
| * Clears the permission state for the specified origin. |
| */ |
| public void clear(String origin) { |
| // Called on the UI thread. |
| postMessage(Message.obtain(null, CLEAR, origin)); |
| } |
| |
| /** |
| * Clears the permission state for all origins. |
| */ |
| public void clearAll() { |
| // Called on the UI thread. |
| postMessage(Message.obtain(null, CLEAR_ALL)); |
| } |
| |
| // Native functions, run on the WebKit thread. |
| private static native Set nativeGetOrigins(); |
| private static native boolean nativeGetAllowed(String origin); |
| private static native void nativeClear(String origin); |
| private static native void nativeClearAll(); |
| } |