/*
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* Copyright (C) 2016 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.android.server.tv;
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import android.Manifest;
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import android.content.BroadcastReceiver;
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import android.content.ComponentName;
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import android.content.Context;
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import android.content.Intent;
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import android.content.IntentFilter;
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import android.content.pm.PackageManager;
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import android.content.pm.ResolveInfo;
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import android.content.pm.ServiceInfo;
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import android.os.Handler;
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import android.os.UserHandle;
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import android.util.Log;
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import android.util.Slog;
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import java.util.ArrayList;
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import java.util.Collections;
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/**
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* Watches for emote provider services to be installed.
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* Adds a provider for each registered service.
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*
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* @see TvRemoteProviderProxy
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*/
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final class TvRemoteProviderWatcher {
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private static final String TAG = "TvRemoteProvWatcher"; // max. 23 chars
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private static final boolean DEBUG = Log.isLoggable(TAG, Log.VERBOSE);
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private final Context mContext;
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private final ProviderMethods mProvider;
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private final Handler mHandler;
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private final PackageManager mPackageManager;
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private final ArrayList<TvRemoteProviderProxy> mProviderProxies = new ArrayList<>();
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private final int mUserId;
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private final String mUnbundledServicePackage;
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private boolean mRunning;
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public TvRemoteProviderWatcher(Context context, ProviderMethods provider, Handler handler) {
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mContext = context;
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mProvider = provider;
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mHandler = handler;
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mUserId = UserHandle.myUserId();
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mPackageManager = context.getPackageManager();
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mUnbundledServicePackage = context.getString(
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com.android.internal.R.string.config_tvRemoteServicePackage);
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}
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public void start() {
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if (DEBUG) Slog.d(TAG, "start()");
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if (!mRunning) {
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mRunning = true;
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IntentFilter filter = new IntentFilter();
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filter.addAction(Intent.ACTION_PACKAGE_ADDED);
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filter.addAction(Intent.ACTION_PACKAGE_REMOVED);
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filter.addAction(Intent.ACTION_PACKAGE_CHANGED);
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filter.addAction(Intent.ACTION_PACKAGE_REPLACED);
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filter.addAction(Intent.ACTION_PACKAGE_RESTARTED);
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filter.addDataScheme("package");
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mContext.registerReceiverAsUser(mScanPackagesReceiver,
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new UserHandle(mUserId), filter, null, mHandler);
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// Scan packages.
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// Also has the side-effect of restarting providers if needed.
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mHandler.post(mScanPackagesRunnable);
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}
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}
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public void stop() {
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if (mRunning) {
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mRunning = false;
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mContext.unregisterReceiver(mScanPackagesReceiver);
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mHandler.removeCallbacks(mScanPackagesRunnable);
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// Stop all providers.
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for (int i = mProviderProxies.size() - 1; i >= 0; i--) {
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mProviderProxies.get(i).stop();
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}
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}
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}
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private void scanPackages() {
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if (!mRunning) {
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return;
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}
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if (DEBUG) Log.d(TAG, "scanPackages()");
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// Add providers for all new services.
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// Reorder the list so that providers left at the end will be the ones to remove.
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int targetIndex = 0;
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Intent intent = new Intent(TvRemoteProviderProxy.SERVICE_INTERFACE);
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for (ResolveInfo resolveInfo : mPackageManager.queryIntentServicesAsUser(
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intent, 0, mUserId)) {
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ServiceInfo serviceInfo = resolveInfo.serviceInfo;
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if (serviceInfo != null && verifyServiceTrusted(serviceInfo)) {
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int sourceIndex = findProvider(serviceInfo.packageName, serviceInfo.name);
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if (sourceIndex < 0) {
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TvRemoteProviderProxy providerProxy =
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new TvRemoteProviderProxy(mContext,
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new ComponentName(serviceInfo.packageName, serviceInfo.name),
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mUserId, serviceInfo.applicationInfo.uid);
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providerProxy.start();
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mProviderProxies.add(targetIndex++, providerProxy);
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mProvider.addProvider(providerProxy);
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} else if (sourceIndex >= targetIndex) {
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TvRemoteProviderProxy provider = mProviderProxies.get(sourceIndex);
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provider.start(); // restart the provider if needed
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provider.rebindIfDisconnected();
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Collections.swap(mProviderProxies, sourceIndex, targetIndex++);
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}
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}
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}
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if (DEBUG) Log.d(TAG, "scanPackages() targetIndex " + targetIndex);
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// Remove providers for missing services.
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if (targetIndex < mProviderProxies.size()) {
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for (int i = mProviderProxies.size() - 1; i >= targetIndex; i--) {
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TvRemoteProviderProxy providerProxy = mProviderProxies.get(i);
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mProvider.removeProvider(providerProxy);
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mProviderProxies.remove(providerProxy);
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providerProxy.stop();
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}
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}
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}
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private boolean verifyServiceTrusted(ServiceInfo serviceInfo) {
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if (serviceInfo.permission == null || !serviceInfo.permission.equals(
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Manifest.permission.BIND_TV_REMOTE_SERVICE)) {
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// If the service does not require this permission then any app could
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// potentially bind to it and cause the atv remote provider service to
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// misbehave. So we only want to trust providers that require the
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// correct permissions.
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Slog.w(TAG, "Ignoring atv remote provider service because it did not "
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+ "require the BIND_TV_REMOTE_SERVICE permission in its manifest: "
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+ serviceInfo.packageName + "/" + serviceInfo.name);
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return false;
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}
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// Check if package name is white-listed here.
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if (!serviceInfo.packageName.equals(mUnbundledServicePackage)) {
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Slog.w(TAG, "Ignoring atv remote provider service because the package has not "
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+ "been set and/or whitelisted: "
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+ serviceInfo.packageName + "/" + serviceInfo.name);
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return false;
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}
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if (!hasNecessaryPermissions(serviceInfo.packageName)) {
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// If the service does not have permission to be
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// a virtual tv remote controller, do not trust it.
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Slog.w(TAG, "Ignoring atv remote provider service because its package does not "
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+ "have TV_VIRTUAL_REMOTE_CONTROLLER permission: " + serviceInfo.packageName);
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return false;
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}
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// Looks good.
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return true;
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}
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// Returns true only if these permissions are present in calling package.
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// Manifest.permission.TV_VIRTUAL_REMOTE_CONTROLLER : virtual remote controller on TV
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private boolean hasNecessaryPermissions(String packageName) {
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if ((mPackageManager.checkPermission(Manifest.permission.TV_VIRTUAL_REMOTE_CONTROLLER,
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packageName) == PackageManager.PERMISSION_GRANTED)) {
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return true;
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}
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return false;
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}
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private int findProvider(String packageName, String className) {
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int count = mProviderProxies.size();
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for (int i = 0; i < count; i++) {
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TvRemoteProviderProxy provider = mProviderProxies.get(i);
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if (provider.hasComponentName(packageName, className)) {
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return i;
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}
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}
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return -1;
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}
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private final BroadcastReceiver mScanPackagesReceiver = new BroadcastReceiver() {
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@Override
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public void onReceive(Context context, Intent intent) {
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if (DEBUG) {
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Slog.d(TAG, "Received package manager broadcast: " + intent);
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}
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mHandler.post(mScanPackagesRunnable);
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}
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};
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private final Runnable mScanPackagesRunnable = new Runnable() {
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@Override
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public void run() {
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scanPackages();
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}
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};
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public interface ProviderMethods {
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void addProvider(TvRemoteProviderProxy providerProxy);
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void removeProvider(TvRemoteProviderProxy providerProxy);
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}
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}
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