| /* |
| * Copyright (C) 2012 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.content.BroadcastReceiver; |
| import android.content.Context; |
| import android.content.Intent; |
| import android.content.IntentFilter; |
| import android.os.Binder; |
| import android.os.Process; |
| import android.util.Slog; |
| import android.webkit.IWebViewUpdateService; |
| import android.webkit.WebViewFactory; |
| |
| import com.android.server.SystemService; |
| |
| /** |
| * Private service to wait for the updatable WebView to be ready for use. |
| * @hide |
| */ |
| public class WebViewUpdateService extends SystemService { |
| |
| private static final String TAG = "WebViewUpdateService"; |
| private static final int WAIT_TIMEOUT_MS = 5000; // Same as KEY_DISPATCHING_TIMEOUT. |
| |
| private boolean mRelroReady32Bit = false; |
| private boolean mRelroReady64Bit = false; |
| |
| private BroadcastReceiver mWebViewUpdatedReceiver; |
| |
| public WebViewUpdateService(Context context) { |
| super(context); |
| } |
| |
| @Override |
| public void onStart() { |
| mWebViewUpdatedReceiver = new BroadcastReceiver() { |
| @Override |
| public void onReceive(Context context, Intent intent) { |
| String webviewPackage = "package:" + WebViewFactory.getWebViewPackageName(); |
| if (webviewPackage.equals(intent.getDataString())) { |
| onWebViewUpdateInstalled(); |
| } |
| } |
| }; |
| IntentFilter filter = new IntentFilter(); |
| filter.addAction(Intent.ACTION_PACKAGE_REPLACED); |
| filter.addDataScheme("package"); |
| getContext().registerReceiver(mWebViewUpdatedReceiver, filter); |
| |
| publishBinderService("webviewupdate", new BinderService()); |
| } |
| |
| private void onWebViewUpdateInstalled() { |
| Slog.d(TAG, "WebView Package updated!"); |
| |
| synchronized (this) { |
| mRelroReady32Bit = false; |
| mRelroReady64Bit = false; |
| } |
| WebViewFactory.onWebViewUpdateInstalled(); |
| } |
| |
| private class BinderService extends IWebViewUpdateService.Stub { |
| |
| /** |
| * The shared relro process calls this to notify us that it's done trying to create a relro |
| * file. This method gets called even if the relro creation has failed or the process |
| * crashed. |
| */ |
| @Override // Binder call |
| public void notifyRelroCreationCompleted(boolean is64Bit, boolean success) { |
| // Verify that the caller is either the shared relro process (nominal case) or the |
| // system server (only in the case the relro process crashes and we get here via the |
| // crashHandler). |
| if (Binder.getCallingUid() != Process.SHARED_RELRO_UID && |
| Binder.getCallingUid() != Process.SYSTEM_UID) { |
| return; |
| } |
| |
| synchronized (WebViewUpdateService.this) { |
| if (is64Bit) { |
| mRelroReady64Bit = true; |
| } else { |
| mRelroReady32Bit = true; |
| } |
| WebViewUpdateService.this.notifyAll(); |
| } |
| } |
| |
| /** |
| * WebViewFactory calls this to block WebView loading until the relro file is created. |
| */ |
| @Override // Binder call |
| public void waitForRelroCreationCompleted(boolean is64Bit) { |
| // The WebViewUpdateService depends on the prepareWebViewInSystemServer call, which |
| // happens later (during the PHASE_ACTIVITY_MANAGER_READY) in SystemServer.java. If |
| // another service there tries to bring up a WebView in the between, the wait below |
| // would deadlock without the check below. |
| if (Binder.getCallingPid() == Process.myPid()) { |
| throw new IllegalStateException("Cannot create a WebView from the SystemServer"); |
| } |
| |
| final long NS_PER_MS = 1000000; |
| final long timeoutTimeMs = System.nanoTime() / NS_PER_MS + WAIT_TIMEOUT_MS; |
| boolean relroReady = (is64Bit ? mRelroReady64Bit : mRelroReady32Bit); |
| synchronized (WebViewUpdateService.this) { |
| while (!relroReady) { |
| final long timeNowMs = System.nanoTime() / NS_PER_MS; |
| if (timeNowMs >= timeoutTimeMs) break; |
| try { |
| WebViewUpdateService.this.wait(timeoutTimeMs - timeNowMs); |
| } catch (InterruptedException e) {} |
| relroReady = (is64Bit ? mRelroReady64Bit : mRelroReady32Bit); |
| } |
| } |
| if (!relroReady) Slog.w(TAG, "creating relro file timed out"); |
| } |
| } |
| |
| } |