From 0ac031b3d29c6de90895c875991585812dc7388f Mon Sep 17 00:00:00 2001 From: Steve Block Date: Tue, 28 Jul 2009 11:53:20 +0100 Subject: Adds the Java GeolocationPermissions class. This is used by the Browser 'Website Settings' menu to get information about Geolocation permissions. --- .../android/webkit/GeolocationPermissions.java | 194 +++++++++++++++++++++ 1 file changed, 194 insertions(+) create mode 100755 core/java/android/webkit/GeolocationPermissions.java (limited to 'core/java/android/webkit/GeolocationPermissions.java') diff --git a/core/java/android/webkit/GeolocationPermissions.java b/core/java/android/webkit/GeolocationPermissions.java new file mode 100755 index 0000000..0f3079a --- /dev/null +++ b/core/java/android/webkit/GeolocationPermissions.java @@ -0,0 +1,194 @@ +/* + * 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 { + // 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 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(); +} -- cgit v1.1