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/*
* Copyright (C) 2022 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.adservices;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.content.pm.PackageManager;
import android.content.pm.ResolveInfo;
import android.os.Handler;
import android.os.HandlerThread;
import android.os.UserHandle;
import android.util.Log;
import com.android.internal.annotations.VisibleForTesting;
import com.android.server.SystemService;
import java.util.List;
/**
* @hide
*/
public class AdServicesManagerService {
private static final String TAG = "AdServicesManagerService";
/**
* Broadcast send from the system service to the AdServices module when a package has been
* installed/uninstalled. This intent must match the intent defined in the AdServices manifest.
*/
private static final String PACKAGE_CHANGED_BROADCAST =
"com.android.adservices.PACKAGE_CHANGED";
/** Key for designating the specific action. */
private static final String ACTION_KEY = "action";
/** Value if the package change was an uninstallation. */
private static final String PACKAGE_FULLY_REMOVED = "package_fully_removed";
/** Value if the package change was an installation. */
private static final String PACKAGE_ADDED = "package_added";
/** Value if the package has its data cleared. */
private static final String PACKAGE_DATA_CLEARED = "package_data_cleared";
private final Context mContext;
private final Handler mHandler;
@VisibleForTesting
AdServicesManagerService(Context context) {
mContext = context;
// Start the handler thread.
HandlerThread handlerThread = new HandlerThread("AdServicesManagerServiceHandler");
handlerThread.start();
mHandler = new Handler(handlerThread.getLooper());
registerPackagedChangedBroadcastReceivers();
}
/** @hide */
public static class Lifecycle extends SystemService {
private AdServicesManagerService mService;
/** @hide */
public Lifecycle(Context context) {
super(context);
mService = new AdServicesManagerService(getContext());
}
/** @hide */
@Override
public void onStart() {
Log.d(TAG, "AdServicesManagerService started!");
}
}
/**
* Registers a receiver for any broadcasts regarding changes to any packages for all users on
* the device at boot up. After receiving the broadcast, send an explicit broadcast to the
* AdServices module as that user.
*/
private void registerPackagedChangedBroadcastReceivers() {
final IntentFilter packageChangedIntentFilter = new IntentFilter();
packageChangedIntentFilter.addAction(Intent.ACTION_PACKAGE_FULLY_REMOVED);
packageChangedIntentFilter.addAction(Intent.ACTION_PACKAGE_DATA_CLEARED);
packageChangedIntentFilter.addAction(Intent.ACTION_PACKAGE_ADDED);
packageChangedIntentFilter.addDataScheme("package");
BroadcastReceiver systemServicePackageChangedReceiver =
new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
UserHandle user = getSendingUser();
mHandler.post(() -> onPackageChange(intent, user));
}
};
mContext.registerReceiverForAllUsers(
systemServicePackageChangedReceiver,
packageChangedIntentFilter,
/* broadcastPermission */ null,
mHandler);
Log.d(TAG, "Package changed broadcast receivers registered.");
}
/** Sends an explicit broadcast to the AdServices module when a package change occurs. */
@VisibleForTesting
public void onPackageChange(Intent intent, UserHandle user) {
Intent explicitBroadcast = new Intent();
explicitBroadcast.setAction(PACKAGE_CHANGED_BROADCAST);
explicitBroadcast.setData(intent.getData());
final Intent i = new Intent(PACKAGE_CHANGED_BROADCAST);
final List<ResolveInfo> resolveInfo =
mContext.getPackageManager()
.queryBroadcastReceiversAsUser(
i,
PackageManager.ResolveInfoFlags.of(PackageManager.GET_RECEIVERS),
user);
if (resolveInfo != null && !resolveInfo.isEmpty()) {
for (ResolveInfo info : resolveInfo) {
explicitBroadcast.setClassName(
info.activityInfo.packageName, info.activityInfo.name);
int uidChanged = intent.getIntExtra(Intent.EXTRA_UID, -1);
Log.v(TAG, "Package changed with UID " + uidChanged);
explicitBroadcast.putExtra(Intent.EXTRA_UID, uidChanged);
switch (intent.getAction()) {
case Intent.ACTION_PACKAGE_DATA_CLEARED:
explicitBroadcast.putExtra(ACTION_KEY, PACKAGE_DATA_CLEARED);
mContext.sendBroadcastAsUser(explicitBroadcast, user);
break;
case Intent.ACTION_PACKAGE_FULLY_REMOVED:
// TODO (b/233373604): Propagate broadcast to users not currently running
explicitBroadcast.putExtra(ACTION_KEY, PACKAGE_FULLY_REMOVED);
mContext.sendBroadcastAsUser(explicitBroadcast, user);
break;
case Intent.ACTION_PACKAGE_ADDED:
explicitBroadcast.putExtra(ACTION_KEY, PACKAGE_ADDED);
// For users where the app is merely being updated rather than added, we
// don't want to send the broadcast.
if (!intent.getExtras().getBoolean(Intent.EXTRA_REPLACING, false)) {
mContext.sendBroadcastAsUser(explicitBroadcast, user);
}
break;
}
}
}
}
}
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