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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.ContentValues;
import android.content.Context;
import android.content.SharedPreferences;
import android.content.SharedPreferences.Editor;
import android.database.ContentObserver;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteException;
import android.database.sqlite.SQLiteStatement;
import android.os.Handler;
import android.preference.PreferenceManager;
import android.provider.Settings;
import android.util.Log;
import java.io.File;
import java.util.HashSet;
/**
* Donut-specific hack to keep Gears permissions in sync with the
* system location setting.
*/
class GearsPermissionsManager {
// The application context.
Context mContext;
// The path to gears.so.
private String mGearsPath;
// The Gears permissions database directory.
private final static String GEARS_DATABASE_DIR = "gears";
// The Gears permissions database file name.
private final static String GEARS_DATABASE_FILE = "permissions.db";
// The Gears location permissions table.
private final static String GEARS_LOCATION_ACCESS_TABLE_NAME =
"LocationAccess";
// The Gears storage access permissions table.
private final static String GEARS_STORAGE_ACCESS_TABLE_NAME = "Access";
// The Gears permissions db schema version table.
private final static String GEARS_SCHEMA_VERSION_TABLE_NAME =
"VersionInfo";
// The shared pref name.
private static final String LAST_KNOWN_LOCATION_SETTING =
"lastKnownLocationSystemSetting";
// The Browser package name.
private static final String BROWSER_PACKAGE_NAME = "com.android.browser";
// The Secure Settings observer that will be notified when the system
// location setting changes.
private SecureSettingsObserver mSettingsObserver;
// The Google URLs whitelisted for Gears location access.
private static HashSet<String> sGearsWhiteList;
static {
sGearsWhiteList = new HashSet<String>();
// NOTE: DO NOT ADD A "/" AT THE END!
sGearsWhiteList.add("http://www.google.com");
sGearsWhiteList.add("http://www.google.co.uk");
}
private static final String LOGTAG = "webcore";
static final boolean DEBUG = false;
static final boolean LOGV_ENABLED = DEBUG;
GearsPermissionsManager(Context context, String gearsPath) {
mContext = context;
mGearsPath = gearsPath;
}
public void doCheckAndStartObserver() {
// Are we running in the browser?
if (!BROWSER_PACKAGE_NAME.equals(mContext.getPackageName())) {
return;
}
// Do the check.
checkGearsPermissions();
// Install the observer.
mSettingsObserver = new SecureSettingsObserver();
mSettingsObserver.observe();
}
private void checkGearsPermissions() {
// Get the current system settings.
int setting = Settings.Secure.getInt(mContext.getContentResolver(),
Settings.Secure.USE_LOCATION_FOR_SERVICES, -1);
// Check if we need to set the Gears permissions.
if (setting != -1 && locationSystemSettingChanged(setting)) {
setGearsPermissionForGoogleDomains(setting);
}
}
private boolean locationSystemSettingChanged(int newSetting) {
SharedPreferences prefs =
PreferenceManager.getDefaultSharedPreferences(mContext);
int oldSetting = 0;
oldSetting = prefs.getInt(LAST_KNOWN_LOCATION_SETTING, oldSetting);
if (oldSetting == newSetting) {
return false;
}
Editor ed = prefs.edit();
ed.putInt(LAST_KNOWN_LOCATION_SETTING, newSetting);
ed.commit();
return true;
}
private void setGearsPermissionForGoogleDomains(int systemPermission) {
// Transform the system permission into a Gears permission
int gearsPermission = (systemPermission == 1 ? 1 : 2);
// Build the path to the Gears library.
File file = new File(mGearsPath).getParentFile();
if (file == null) {
return;
}
// Build the Gears database file name.
file = new File(file.getAbsolutePath() + File.separator
+ GEARS_DATABASE_DIR + File.separator + GEARS_DATABASE_FILE);
// Remember whether or not we need to create the LocationAccess table.
boolean needToCreateTables = !file.exists();
// Try opening the Gears database.
SQLiteDatabase permissions;
try {
permissions = SQLiteDatabase.openOrCreateDatabase(file, null);
} catch (SQLiteException e) {
if (LOGV_ENABLED) {
Log.v(LOGTAG, "Could not open Gears permission DB: "
+ e.getMessage());
}
// Just bail out.
return;
}
// We now have a database open. Begin a transaction.
permissions.beginTransaction();
try {
if (needToCreateTables) {
// Create the tables. Note that this creates the
// Gears tables for the permissions DB schema version 2.
// The Gears schema upgrade process will take care of the rest.
// First, the storage access table.
SQLiteStatement statement = permissions.compileStatement(
"CREATE TABLE IF NOT EXISTS "
+ GEARS_STORAGE_ACCESS_TABLE_NAME
+ " (Name TEXT UNIQUE, Value)");
statement.execute();
// Next the location access table.
statement = permissions.compileStatement(
"CREATE TABLE IF NOT EXISTS "
+ GEARS_LOCATION_ACCESS_TABLE_NAME
+ " (Name TEXT UNIQUE, Value)");
statement.execute();
// Finally, the schema version table.
statement = permissions.compileStatement(
"CREATE TABLE IF NOT EXISTS "
+ GEARS_SCHEMA_VERSION_TABLE_NAME
+ " (Name TEXT UNIQUE, Value)");
statement.execute();
// Set the schema version to 2.
ContentValues schema = new ContentValues();
schema.put("Name", "Version");
schema.put("Value", 2);
permissions.insert(GEARS_SCHEMA_VERSION_TABLE_NAME, null,
schema);
}
ContentValues permissionValues = new ContentValues();
for (String url : sGearsWhiteList) {
permissionValues.put("Name", url);
permissionValues.put("Value", gearsPermission);
permissions.replace(GEARS_LOCATION_ACCESS_TABLE_NAME, null,
permissionValues);
permissionValues.clear();
}
// Commit the transaction.
permissions.setTransactionSuccessful();
} catch (SQLiteException e) {
if (LOGV_ENABLED) {
Log.v(LOGTAG, "Could not set the Gears permissions: "
+ e.getMessage());
}
} finally {
permissions.endTransaction();
permissions.close();
}
}
class SecureSettingsObserver extends ContentObserver {
SecureSettingsObserver() {
super(new Handler());
}
void observe() {
ContentResolver resolver = mContext.getContentResolver();
resolver.registerContentObserver(Settings.Secure.getUriFor(
Settings.Secure.USE_LOCATION_FOR_SERVICES), false, this);
}
@Override
public void onChange(boolean selfChange) {
checkGearsPermissions();
}
}
}
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