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/*
* Copyright (C) 2014 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.media;
import android.content.Context;
import android.media.IMediaSession;
import android.media.IMediaSessionCallback;
import android.media.IMediaSessionManager;
import android.os.Binder;
import android.os.RemoteException;
import android.text.TextUtils;
import android.util.Log;
import com.android.server.SystemService;
import java.util.ArrayList;
/**
* System implementation of MediaSessionManager
*/
public class MediaSessionService extends SystemService {
private static final String TAG = "MediaSessionService";
private static final boolean DEBUG = Log.isLoggable(TAG, Log.DEBUG);
private final SessionManagerImpl mSessionManagerImpl;
private final ArrayList<MediaSessionRecord> mSessions
= new ArrayList<MediaSessionRecord>();
private final Object mLock = new Object();
public MediaSessionService(Context context) {
super(context);
mSessionManagerImpl = new SessionManagerImpl();
}
@Override
public void onStart() {
publishBinderService(Context.MEDIA_SESSION_SERVICE, mSessionManagerImpl);
}
void sessionDied(MediaSessionRecord session) {
synchronized (mSessions) {
destroySessionLocked(session);
}
}
void destroySession(MediaSessionRecord session) {
synchronized (mSessions) {
destroySessionLocked(session);
}
}
private void destroySessionLocked(MediaSessionRecord session) {
mSessions.remove(session);
}
private void enforcePackageName(String packageName, int uid) {
if (TextUtils.isEmpty(packageName)) {
throw new IllegalArgumentException("packageName may not be empty");
}
String[] packages = getContext().getPackageManager().getPackagesForUid(uid);
final int packageCount = packages.length;
for (int i = 0; i < packageCount; i++) {
if (packageName.equals(packages[i])) {
return;
}
}
throw new IllegalArgumentException("packageName is not owned by the calling process");
}
private MediaSessionRecord createSessionInternal(int pid, String packageName,
IMediaSessionCallback cb, String tag) {
synchronized (mLock) {
return createSessionLocked(pid, packageName, cb, tag);
}
}
private MediaSessionRecord createSessionLocked(int pid, String packageName,
IMediaSessionCallback cb, String tag) {
final MediaSessionRecord session = new MediaSessionRecord(pid, packageName, cb, tag, this);
try {
cb.asBinder().linkToDeath(session, 0);
} catch (RemoteException e) {
throw new RuntimeException("Media Session owner died prematurely.", e);
}
synchronized (mSessions) {
mSessions.add(session);
}
if (DEBUG) {
Log.d(TAG, "Created session for package " + packageName + " with tag " + tag);
}
return session;
}
class SessionManagerImpl extends IMediaSessionManager.Stub {
@Override
public IMediaSession createSession(String packageName, IMediaSessionCallback cb, String tag)
throws RemoteException {
final int pid = Binder.getCallingPid();
final int uid = Binder.getCallingUid();
final long token = Binder.clearCallingIdentity();
try {
enforcePackageName(packageName, uid);
if (cb == null) {
throw new IllegalArgumentException("Controller callback cannot be null");
}
return createSessionInternal(pid, packageName, cb, tag).getSessionBinder();
} finally {
Binder.restoreCallingIdentity(token);
}
}
}
}
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