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/*
* 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.content.ContentResolver;
import android.content.Context;
import android.content.SharedPreferences;
import android.content.SharedPreferences.Editor;
import android.database.ContentObserver;
import android.os.Handler;
import android.preference.PreferenceManager;
import android.provider.Settings;
import java.util.HashSet;
/**
* A class to manage the interaction between the system setting 'Location &
* Security - Share with Google' and the browser. When this setting is set
* to true, we allow Geolocation for Google origins. When this setting is
* set to false, we clear Geolocation permissions for Google origins.
* @hide pending API council review
*/
class GoogleLocationSettingManager {
// The observer used to listen to the system setting.
private GoogleLocationSettingObserver mSettingObserver;
// The value of the system setting that indicates true.
private final static int sSystemSettingTrue = 1;
// The value of the system setting that indicates false.
private final static int sSystemSettingFalse = 0;
// The value of the USE_LOCATION_FOR_SERVICES system setting last read
// by the browser.
private final static String LAST_READ_USE_LOCATION_FOR_SERVICES =
"lastReadUseLocationForServices";
// The Browser package name.
private static final String BROWSER_PACKAGE_NAME = "com.android.browser";
// The Google origins we consider.
private static HashSet<String> sGoogleOrigins;
static {
sGoogleOrigins = new HashSet<String>();
// NOTE: DO NOT ADD A "/" AT THE END!
sGoogleOrigins.add("http://www.google.com");
sGoogleOrigins.add("http://www.google.co.uk");
}
private static GoogleLocationSettingManager sGoogleLocationSettingManager = null;
private static int sRefCount = 0;
static GoogleLocationSettingManager getInstance() {
if (sGoogleLocationSettingManager == null) {
sGoogleLocationSettingManager = new GoogleLocationSettingManager();
}
return sGoogleLocationSettingManager;
}
private GoogleLocationSettingManager() {}
/**
* Starts the manager. Checks whether the setting has changed and
* installs an observer to listen for future changes.
*/
public void start(Context context) {
// Are we running in the browser?
if (context == null || !BROWSER_PACKAGE_NAME.equals(context.getPackageName())) {
return;
}
// Increase the refCount
sRefCount++;
// Are we already registered?
if (mSettingObserver != null) {
return;
}
// Read and apply the settings if needed.
maybeApplySetting(context);
// Register to receive notifications when the system settings change.
mSettingObserver = new GoogleLocationSettingObserver();
mSettingObserver.observe(context);
}
/**
* Stops the manager.
*/
public void stop() {
// Are we already registered?
if (mSettingObserver == null) {
return;
}
if (--sRefCount == 0) {
mSettingObserver.doNotObserve();
mSettingObserver = null;
}
}
/**
* Checks to see if the system setting has changed and if so,
* updates the Geolocation permissions accordingly.
* @param the Application context
*/
private void maybeApplySetting(Context context) {
int setting = getSystemSetting(context);
if (settingChanged(setting, context)) {
applySetting(setting);
}
}
/**
* Gets the current system setting for 'Use location for Google services'.
* @param the Application context
* @return The system setting.
*/
private int getSystemSetting(Context context) {
return Settings.Secure.getInt(context.getContentResolver(),
Settings.Secure.USE_LOCATION_FOR_SERVICES,
sSystemSettingFalse);
}
/**
* Determines whether the supplied setting has changed from the last
* value read by the browser.
* @param setting The setting.
* @param the Application context
* @return Whether the setting has changed from the last value read
* by the browser.
*/
private boolean settingChanged(int setting, Context context) {
SharedPreferences preferences =
PreferenceManager.getDefaultSharedPreferences(context);
// Default to false. If the system setting is false the first time it is ever read by the
// browser, there's nothing to do.
int lastReadSetting = sSystemSettingFalse;
lastReadSetting = preferences.getInt(LAST_READ_USE_LOCATION_FOR_SERVICES,
lastReadSetting);
if (lastReadSetting == setting) {
return false;
}
Editor editor = preferences.edit();
editor.putInt(LAST_READ_USE_LOCATION_FOR_SERVICES, setting);
editor.commit();
return true;
}
/**
* Applies the supplied setting to the Geolocation permissions.
* @param setting The setting.
*/
private void applySetting(int setting) {
for (String origin : sGoogleOrigins) {
if (setting == sSystemSettingTrue) {
GeolocationPermissions.getInstance().allow(origin);
} else {
GeolocationPermissions.getInstance().clear(origin);
}
}
}
/**
* This class implements an observer to listen for changes to the
* system setting.
*/
private class GoogleLocationSettingObserver extends ContentObserver {
private Context mContext;
GoogleLocationSettingObserver() {
super(new Handler());
}
void observe(Context context) {
if (mContext != null) {
return;
}
ContentResolver resolver = context.getContentResolver();
resolver.registerContentObserver(Settings.Secure.getUriFor(
Settings.Secure.USE_LOCATION_FOR_SERVICES), false, this);
mContext = context;
}
void doNotObserve() {
if (mContext == null) {
return;
}
ContentResolver resolver = mContext.getContentResolver();
resolver.unregisterContentObserver(this);
mContext = null;
}
@Override
public void onChange(boolean selfChange) {
// This may come after the call to doNotObserve() above,
// so mContext may be null.
if (mContext != null) {
maybeApplySetting(mContext);
}
}
}
}
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