1 /* 2 * Copyright (C) 2017 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 17 package com.android.server.timezone; 18 19 import com.android.server.EventLogTags; 20 21 import android.app.timezone.RulesUpdaterContract; 22 import android.content.BroadcastReceiver; 23 import android.content.Context; 24 import android.content.Intent; 25 import android.content.IntentFilter; 26 import android.os.PatternMatcher; 27 import android.os.UserHandle; 28 import android.util.Slog; 29 30 /** 31 * The bona fide implementation of {@link PackageTrackerIntentHelper}. 32 */ 33 final class PackageTrackerIntentHelperImpl implements PackageTrackerIntentHelper { 34 35 private final static String TAG = "timezone.PackageTrackerIntentHelperImpl"; 36 37 private final Context mContext; 38 private String mUpdaterAppPackageName; 39 40 PackageTrackerIntentHelperImpl(Context context) { 41 mContext = context; 42 } 43 44 @Override 45 public void initialize(String updaterAppPackageName, String dataAppPackageName, 46 PackageTracker packageTracker) { 47 mUpdaterAppPackageName = updaterAppPackageName; 48 49 // Register for events of interest. 50 51 // The intent filter that triggers when package update events happen that indicate there may 52 // be work to do. 53 IntentFilter packageIntentFilter = new IntentFilter(); 54 55 packageIntentFilter.addDataScheme("package"); 56 packageIntentFilter.addDataSchemeSpecificPart( 57 updaterAppPackageName, PatternMatcher.PATTERN_LITERAL); 58 packageIntentFilter.addDataSchemeSpecificPart( 59 dataAppPackageName, PatternMatcher.PATTERN_LITERAL); 60 61 // ACTION_PACKAGE_ADDED is fired when a package is upgraded or downgraded (in addition to 62 // ACTION_PACKAGE_REMOVED and ACTION_PACKAGE_REPLACED). A system/priv-app can never be 63 // removed entirely so we do not need to trigger on ACTION_PACKAGE_REMOVED or 64 // ACTION_PACKAGE_FULLY_REMOVED. 65 packageIntentFilter.addAction(Intent.ACTION_PACKAGE_ADDED); 66 67 // ACTION_PACKAGE_CHANGED is used when a package is disabled / re-enabled. It is not 68 // strictly necessary to trigger on this but it won't hurt anything and may catch some cases 69 // where a package has changed while disabled. 70 // Note: ACTION_PACKAGE_CHANGED is not fired when updating a suspended app, but 71 // ACTION_PACKAGE_ADDED, ACTION_PACKAGE_REMOVED and ACTION_PACKAGE_REPLACED are (and the app 72 // is left in an unsuspended state after this). 73 packageIntentFilter.addAction(Intent.ACTION_PACKAGE_CHANGED); 74 75 // We do not register for ACTION_PACKAGE_RESTARTED because it doesn't imply an update. 76 // We do not register for ACTION_PACKAGE_DATA_CLEARED because the updater / data apps are 77 // not expected to need local data. 78 79 Receiver packageUpdateReceiver = new Receiver(packageTracker); 80 mContext.registerReceiverAsUser( 81 packageUpdateReceiver, UserHandle.SYSTEM, packageIntentFilter, 82 null /* broadcastPermission */, null /* default handler */); 83 } 84 85 /** Sends an intent to trigger an update check. */ 86 @Override 87 public void sendTriggerUpdateCheck(CheckToken checkToken) { 88 RulesUpdaterContract.sendBroadcast( 89 mContext, mUpdaterAppPackageName, checkToken.toByteArray()); 90 EventLogTags.writeTimezoneTriggerCheck(checkToken.toString()); 91 } 92 93 @Override 94 public synchronized void scheduleReliabilityTrigger(long minimumDelayMillis) { 95 TimeZoneUpdateIdler.schedule(mContext, minimumDelayMillis); 96 } 97 98 @Override 99 public synchronized void unscheduleReliabilityTrigger() { 100 TimeZoneUpdateIdler.unschedule(mContext); 101 } 102 103 private static class Receiver extends BroadcastReceiver { 104 private final PackageTracker mPackageTracker; 105 106 private Receiver(PackageTracker packageTracker) { 107 mPackageTracker = packageTracker; 108 } 109 110 @Override 111 public void onReceive(Context context, Intent intent) { 112 Slog.d(TAG, "Received intent: " + intent.toString()); 113 mPackageTracker.triggerUpdateIfNeeded(true /* packageChanged */); 114 } 115 } 116 } 117