| /* |
| * Copyright (C) 2016 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 com.android.server.webkit; |
| |
| import android.app.ActivityManager; |
| import android.app.AppGlobals; |
| import android.content.Context; |
| import android.content.pm.ApplicationInfo; |
| import android.content.pm.IPackageDeleteObserver; |
| import android.content.pm.PackageInfo; |
| import android.content.pm.PackageManager; |
| import android.content.pm.PackageManager.NameNotFoundException; |
| import android.content.pm.UserInfo; |
| import android.content.res.XmlResourceParser; |
| import android.database.ContentObserver; |
| import android.os.Build; |
| import android.os.RemoteException; |
| import android.os.UserHandle; |
| import android.os.UserManager; |
| import android.provider.Settings.Global; |
| import android.provider.Settings; |
| import android.util.AndroidRuntimeException; |
| import android.util.Log; |
| import android.webkit.UserPackage; |
| import android.webkit.WebViewFactory; |
| import android.webkit.WebViewProviderInfo; |
| import android.webkit.WebViewZygote; |
| |
| import com.android.internal.util.XmlUtils; |
| |
| import java.io.IOException; |
| import java.util.ArrayList; |
| import java.util.List; |
| |
| import org.xmlpull.v1.XmlPullParserException; |
| |
| /** |
| * Default implementation for the WebView preparation Utility interface. |
| * @hide |
| */ |
| public class SystemImpl implements SystemInterface { |
| private static final String TAG = SystemImpl.class.getSimpleName(); |
| private static final String TAG_START = "webviewproviders"; |
| private static final String TAG_WEBVIEW_PROVIDER = "webviewprovider"; |
| private static final String TAG_PACKAGE_NAME = "packageName"; |
| private static final String TAG_DESCRIPTION = "description"; |
| // Whether or not the provider must be explicitly chosen by the user to be used. |
| private static final String TAG_AVAILABILITY = "availableByDefault"; |
| private static final String TAG_SIGNATURE = "signature"; |
| private static final String TAG_FALLBACK = "isFallback"; |
| private final WebViewProviderInfo[] mWebViewProviderPackages; |
| |
| // Initialization-on-demand holder idiom for getting the WebView provider packages once and |
| // for all in a thread-safe manner. |
| private static class LazyHolder { |
| private static final SystemImpl INSTANCE = new SystemImpl(); |
| } |
| |
| public static SystemImpl getInstance() { |
| return LazyHolder.INSTANCE; |
| } |
| |
| private SystemImpl() { |
| int numFallbackPackages = 0; |
| int numAvailableByDefaultPackages = 0; |
| int numAvByDefaultAndNotFallback = 0; |
| XmlResourceParser parser = null; |
| List<WebViewProviderInfo> webViewProviders = new ArrayList<WebViewProviderInfo>(); |
| try { |
| parser = AppGlobals.getInitialApplication().getResources().getXml( |
| com.android.internal.R.xml.config_webview_packages); |
| XmlUtils.beginDocument(parser, TAG_START); |
| while(true) { |
| XmlUtils.nextElement(parser); |
| String element = parser.getName(); |
| if (element == null) { |
| break; |
| } |
| if (element.equals(TAG_WEBVIEW_PROVIDER)) { |
| String packageName = parser.getAttributeValue(null, TAG_PACKAGE_NAME); |
| if (packageName == null) { |
| throw new AndroidRuntimeException( |
| "WebView provider in framework resources missing package name"); |
| } |
| String description = parser.getAttributeValue(null, TAG_DESCRIPTION); |
| if (description == null) { |
| throw new AndroidRuntimeException( |
| "WebView provider in framework resources missing description"); |
| } |
| boolean availableByDefault = "true".equals( |
| parser.getAttributeValue(null, TAG_AVAILABILITY)); |
| boolean isFallback = "true".equals( |
| parser.getAttributeValue(null, TAG_FALLBACK)); |
| WebViewProviderInfo currentProvider = new WebViewProviderInfo( |
| packageName, description, availableByDefault, isFallback, |
| readSignatures(parser)); |
| if (currentProvider.isFallback) { |
| numFallbackPackages++; |
| if (!currentProvider.availableByDefault) { |
| throw new AndroidRuntimeException( |
| "Each WebView fallback package must be available by default."); |
| } |
| if (numFallbackPackages > 1) { |
| throw new AndroidRuntimeException( |
| "There can be at most one WebView fallback package."); |
| } |
| } |
| if (currentProvider.availableByDefault) { |
| numAvailableByDefaultPackages++; |
| if (!currentProvider.isFallback) { |
| numAvByDefaultAndNotFallback++; |
| } |
| } |
| webViewProviders.add(currentProvider); |
| } |
| else { |
| Log.e(TAG, "Found an element that is not a WebView provider"); |
| } |
| } |
| } catch (XmlPullParserException | IOException e) { |
| throw new AndroidRuntimeException("Error when parsing WebView config " + e); |
| } finally { |
| if (parser != null) parser.close(); |
| } |
| if (numAvailableByDefaultPackages == 0) { |
| throw new AndroidRuntimeException("There must be at least one WebView package " |
| + "that is available by default"); |
| } |
| if (numAvByDefaultAndNotFallback == 0) { |
| throw new AndroidRuntimeException("There must be at least one WebView package " |
| + "that is available by default and not a fallback"); |
| } |
| mWebViewProviderPackages = |
| webViewProviders.toArray(new WebViewProviderInfo[webViewProviders.size()]); |
| } |
| /** |
| * Returns all packages declared in the framework resources as potential WebView providers. |
| * @hide |
| * */ |
| @Override |
| public WebViewProviderInfo[] getWebViewPackages() { |
| return mWebViewProviderPackages; |
| } |
| |
| public int getFactoryPackageVersion(String packageName) throws NameNotFoundException { |
| PackageManager pm = AppGlobals.getInitialApplication().getPackageManager(); |
| return pm.getPackageInfo(packageName, PackageManager.MATCH_FACTORY_ONLY).versionCode; |
| } |
| |
| /** |
| * Reads all signatures at the current depth (within the current provider) from the XML parser. |
| */ |
| private static String[] readSignatures(XmlResourceParser parser) throws IOException, |
| XmlPullParserException { |
| List<String> signatures = new ArrayList<String>(); |
| int outerDepth = parser.getDepth(); |
| while(XmlUtils.nextElementWithin(parser, outerDepth)) { |
| if (parser.getName().equals(TAG_SIGNATURE)) { |
| // Parse the value within the signature tag |
| String signature = parser.nextText(); |
| signatures.add(signature); |
| } else { |
| Log.e(TAG, "Found an element in a webview provider that is not a signature"); |
| } |
| } |
| return signatures.toArray(new String[signatures.size()]); |
| } |
| |
| @Override |
| public int onWebViewProviderChanged(PackageInfo packageInfo) { |
| return WebViewFactory.onWebViewProviderChanged(packageInfo); |
| } |
| |
| @Override |
| public String getUserChosenWebViewProvider(Context context) { |
| return Settings.Global.getString(context.getContentResolver(), |
| Settings.Global.WEBVIEW_PROVIDER); |
| } |
| |
| @Override |
| public void updateUserSetting(Context context, String newProviderName) { |
| Settings.Global.putString(context.getContentResolver(), |
| Settings.Global.WEBVIEW_PROVIDER, |
| newProviderName == null ? "" : newProviderName); |
| } |
| |
| @Override |
| public void killPackageDependents(String packageName) { |
| try { |
| ActivityManager.getService().killPackageDependents(packageName, |
| UserHandle.USER_ALL); |
| } catch (RemoteException e) { |
| } |
| } |
| |
| @Override |
| public boolean isFallbackLogicEnabled() { |
| // Note that this is enabled by default (i.e. if the setting hasn't been set). |
| return Settings.Global.getInt(AppGlobals.getInitialApplication().getContentResolver(), |
| Settings.Global.WEBVIEW_FALLBACK_LOGIC_ENABLED, 1) == 1; |
| } |
| |
| @Override |
| public void enableFallbackLogic(boolean enable) { |
| Settings.Global.putInt(AppGlobals.getInitialApplication().getContentResolver(), |
| Settings.Global.WEBVIEW_FALLBACK_LOGIC_ENABLED, enable ? 1 : 0); |
| } |
| |
| @Override |
| public void uninstallAndDisablePackageForAllUsers(Context context, String packageName) { |
| enablePackageForAllUsers(context, packageName, false); |
| try { |
| PackageManager pm = AppGlobals.getInitialApplication().getPackageManager(); |
| ApplicationInfo applicationInfo = pm.getApplicationInfo(packageName, 0); |
| if (applicationInfo != null && applicationInfo.isUpdatedSystemApp()) { |
| pm.deletePackage(packageName, new IPackageDeleteObserver.Stub() { |
| public void packageDeleted(String packageName, int returnCode) { |
| enablePackageForAllUsers(context, packageName, false); |
| } |
| }, PackageManager.DELETE_SYSTEM_APP | PackageManager.DELETE_ALL_USERS); |
| } |
| } catch (NameNotFoundException e) { |
| } |
| } |
| |
| @Override |
| public void enablePackageForAllUsers(Context context, String packageName, boolean enable) { |
| UserManager userManager = (UserManager)context.getSystemService(Context.USER_SERVICE); |
| for(UserInfo userInfo : userManager.getUsers()) { |
| enablePackageForUser(packageName, enable, userInfo.id); |
| } |
| } |
| |
| @Override |
| public void enablePackageForUser(String packageName, boolean enable, int userId) { |
| try { |
| AppGlobals.getPackageManager().setApplicationEnabledSetting( |
| packageName, |
| enable ? PackageManager.COMPONENT_ENABLED_STATE_DEFAULT : |
| PackageManager.COMPONENT_ENABLED_STATE_DISABLED_USER, 0, |
| userId, null); |
| } catch (RemoteException | IllegalArgumentException e) { |
| Log.w(TAG, "Tried to " + (enable ? "enable " : "disable ") + packageName |
| + " for user " + userId + ": " + e); |
| } |
| } |
| |
| @Override |
| public boolean systemIsDebuggable() { |
| return Build.IS_DEBUGGABLE; |
| } |
| |
| @Override |
| public PackageInfo getPackageInfoForProvider(WebViewProviderInfo configInfo) |
| throws NameNotFoundException { |
| PackageManager pm = AppGlobals.getInitialApplication().getPackageManager(); |
| return pm.getPackageInfo(configInfo.packageName, PACKAGE_FLAGS); |
| } |
| |
| @Override |
| public List<UserPackage> getPackageInfoForProviderAllUsers(Context context, |
| WebViewProviderInfo configInfo) { |
| return UserPackage.getPackageInfosAllUsers(context, configInfo.packageName, PACKAGE_FLAGS); |
| } |
| |
| @Override |
| public int getMultiProcessSetting(Context context) { |
| return Settings.Global.getInt(context.getContentResolver(), |
| Settings.Global.WEBVIEW_MULTIPROCESS, 0); |
| } |
| |
| @Override |
| public void setMultiProcessSetting(Context context, int value) { |
| Settings.Global.putInt(context.getContentResolver(), |
| Settings.Global.WEBVIEW_MULTIPROCESS, value); |
| } |
| |
| @Override |
| public void notifyZygote(boolean enableMultiProcess) { |
| WebViewZygote.setMultiprocessEnabled(enableMultiProcess); |
| } |
| |
| @Override |
| public boolean isMultiProcessDefaultEnabled() { |
| // Multiprocess is enabled for all 64-bit devices, since the ability to run the renderer |
| // process in 32-bit when it's a separate process typically results in a net memory saving. |
| // Multiprocess is also enabled for 32-bit devices unless they report they are "low ram". |
| return Build.SUPPORTED_64_BIT_ABIS.length > 0 || !ActivityManager.isLowRamDeviceStatic(); |
| } |
| |
| // flags declaring we want extra info from the package manager for webview providers |
| private final static int PACKAGE_FLAGS = PackageManager.GET_META_DATA |
| | PackageManager.GET_SIGNATURES | PackageManager.MATCH_DEBUG_TRIAGED_MISSING |
| | PackageManager.MATCH_ANY_USER; |
| } |