WebViewUpdateService.java revision 810c052d9b117217152c2a609ccec056a2a61d1e 
1/*
2 * Copyright (C) 2012 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17package com.android.server.webkit;
18
19import android.content.BroadcastReceiver;
20import android.content.Context;
21import android.content.Intent;
22import android.content.IntentFilter;
23import android.os.Binder;
24import android.os.Process;
25import android.util.Log;
26import android.util.Slog;
27import android.webkit.IWebViewUpdateService;
28import android.webkit.WebViewFactory;
29
30/**
31 * Private service to wait for the updatable WebView to be ready for use.
32 * @hide
33 */
34// TODO This should be implemented using the new pattern for system services.
35// See comments in CL 509840.
36public class WebViewUpdateService extends IWebViewUpdateService.Stub {
37
38    private static final String TAG = "WebViewUpdateService";
39
40    private boolean mRelroReady32Bit = false;
41    private boolean mRelroReady64Bit = false;
42
43    private BroadcastReceiver mWebViewUpdatedReceiver;
44
45    public WebViewUpdateService(Context context) {
46        mWebViewUpdatedReceiver = new BroadcastReceiver() {
47                @Override
48                public void onReceive(Context context, Intent intent) {
49                    String webviewPackage = "package:" + WebViewFactory.getWebViewPackageName();
50                    if (webviewPackage.equals(intent.getDataString())) {
51                        onWebViewUpdateInstalled();
52                    }
53                }
54        };
55        IntentFilter filter = new IntentFilter();
56        filter.addAction(Intent.ACTION_PACKAGE_REPLACED);
57        filter.addDataScheme("package");
58        context.registerReceiver(mWebViewUpdatedReceiver, filter);
59    }
60
61    /**
62     * The shared relro process calls this to notify us that it's done trying to create a relro
63     * file. This method gets called even if the relro creation has failed or the process crashed.
64     */
65    @Override // Binder call
66    public void notifyRelroCreationCompleted(boolean is64Bit, boolean success) {
67        // Verify that the caller is either the shared relro process (nominal case) or the system
68        // server (only in the case the relro process crashes and we get here via the crashHandler).
69        if (Binder.getCallingUid() != Process.SHARED_RELRO_UID &&
70                Binder.getCallingUid() != Process.SYSTEM_UID) {
71            return;
72        }
73
74        synchronized (this) {
75            if (is64Bit) {
76                mRelroReady64Bit = true;
77            } else {
78                mRelroReady32Bit = true;
79            }
80            this.notifyAll();
81        }
82    }
83
84    /**
85     * WebViewFactory calls this to block WebView loading until the relro file is created.
86     */
87    @Override // Binder call
88    public void waitForRelroCreationCompleted(boolean is64Bit) {
89        if (Binder.getCallingUid() == Process.SYSTEM_UID) {
90            Slog.wtf(TAG, "Trying to load WebView from the SystemServer",
91                     new IllegalStateException());
92        }
93
94        synchronized (this) {
95            if (is64Bit) {
96                while (!mRelroReady64Bit) {
97                    try {
98                        this.wait();
99                    } catch (InterruptedException e) {}
100                }
101            } else {
102                while (!mRelroReady32Bit) {
103                    try {
104                        this.wait();
105                    } catch (InterruptedException e) {}
106                }
107            }
108        }
109    }
110
111    private void onWebViewUpdateInstalled() {
112        Log.d(TAG, "WebView Package updated!");
113
114        synchronized (this) {
115            mRelroReady32Bit = false;
116            mRelroReady64Bit = false;
117        }
118        WebViewFactory.prepareWebViewInSystemServer();
119    }
120}
121