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/*
* Copyright (C) 2016 The CyanogenMod 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 cyanogenmod.app;
import android.annotation.NonNull;
import android.app.AppGlobals;
import android.app.Service;
import android.content.Intent;
import android.content.pm.ApplicationInfo;
import android.content.pm.PackageManager;
import android.os.Binder;
import android.os.IBinder;
import android.os.RemoteCallbackList;
import android.os.RemoteException;
import android.os.UserHandle;
import android.util.Log;
import cyanogenmod.platform.Manifest;
/**
* Base Live lock screen manager service to be extended by applications that implement the
* {@link LiveLockScreenManager#SERVICE_INTERFACE}
*
* @hide
*/
abstract public class BaseLiveLockManagerService extends Service
implements ILiveLockScreenManagerProvider {
private static final String TAG = BaseLiveLockManagerService.class.getSimpleName();
private final RemoteCallbackList<ILiveLockScreenChangeListener> mChangeListeners =
new RemoteCallbackList<>();
@Override
public final IBinder onBind(Intent intent) {
return mService;
}
@Override
public final IBinder asBinder() {
return mService;
}
@Override
abstract public void enqueueLiveLockScreen(String pkg, int id, LiveLockScreenInfo lls,
int[] idReceived, int userId) throws RemoteException;
@Override
abstract public void cancelLiveLockScreen(String pkg, int id, int userId)
throws RemoteException;
@Override
abstract public LiveLockScreenInfo getCurrentLiveLockScreen() throws RemoteException;
@Override
abstract public void updateDefaultLiveLockScreen(LiveLockScreenInfo llsInfo)
throws RemoteException;
@Override
public boolean getLiveLockScreenEnabled() throws RemoteException {
return false;
}
@Override
public final boolean registerChangeListener(
ILiveLockScreenChangeListener listener) throws RemoteException {
return mChangeListeners.register(listener);
}
@Override
public final boolean unregisterChangeListener(
ILiveLockScreenChangeListener listener) throws RemoteException {
return mChangeListeners.unregister(listener);
}
/**
* This method should be called whenever there is an update to the current Live lock screen
* to be displayed.
*
* @param llsInfo LiveLockScreenInfo for the current Live lock screen
*/
protected final void notifyChangeListeners(LiveLockScreenInfo llsInfo) {
int N = mChangeListeners.beginBroadcast();
for (int i = 0; i < N; i++) {
ILiveLockScreenChangeListener listener = mChangeListeners.getBroadcastItem(i);
try {
listener.onLiveLockScreenChanged(llsInfo);
} catch (RemoteException e) {
Log.w(TAG, "Unable to notifiy change listener", e);
}
}
mChangeListeners.finishBroadcast();
}
/**
* Returns true if the caller has been granted the
* {@link cyanogenmod.platform.Manifest.permission#LIVE_LOCK_SCREEN_MANAGER_ACCESS_PRIVATE}
* permission.
*
* @return
*/
private final boolean hasPrivatePermissions() {
return checkCallingPermission(Manifest.permission
.LIVE_LOCK_SCREEN_MANAGER_ACCESS_PRIVATE) == PackageManager.PERMISSION_GRANTED;
}
/**
* Enforces the {@link cyanogenmod.platform.Manifest.permission#LIVE_LOCK_SCREEN_MANAGER_ACCESS}
* permission.
*/
protected final void enforceAccessPermission() {
if (hasPrivatePermissions()) return;
enforceCallingPermission(Manifest.permission.LIVE_LOCK_SCREEN_MANAGER_ACCESS,
null);
}
/**
* Enforces the
* {@link cyanogenmod.platform.Manifest.permission#LIVE_LOCK_SCREEN_MANAGER_ACCESS_PRIVATE}
* permission.
*/
protected final void enforcePrivateAccessPermission() {
enforceCallingPermission(
Manifest.permission.LIVE_LOCK_SCREEN_MANAGER_ACCESS_PRIVATE, null);
}
/**
* Enforces the LLS being shown/canceled is from the calling package or from a system app that
* has the
* {@link cyanogenmod.platform.Manifest.permission#LIVE_LOCK_SCREEN_MANAGER_ACCESS_PRIVATE}
* permission.
*
* @param pkg Package name of caller
* @param llsInfo Live lock screen info with component to check
*/
protected final void enforceSamePackageOrSystem(String pkg,
@NonNull LiveLockScreenInfo llsInfo) {
// only apps with the private permission can show/cancel live lock screens from other
// packages
if (hasPrivatePermissions()) return;
if (llsInfo.component != null && !llsInfo.component.getPackageName().equals(pkg)) {
throw new SecurityException("Modifying Live lock screen from different packages not " +
"allowed. Calling package: " + pkg + " LLS package: " +
llsInfo.component.getPackageName());
}
final int uid = Binder.getCallingUid();
try {
ApplicationInfo ai = AppGlobals.getPackageManager().getApplicationInfo(
pkg, 0, UserHandle.getCallingUserId());
if (ai == null) {
throw new SecurityException("Unknown package " + pkg);
}
if (!UserHandle.isSameApp(ai.uid, uid)) {
throw new SecurityException("Calling uid " + uid + " gave package"
+ pkg + " which is owned by uid " + ai.uid);
}
} catch (RemoteException re) {
throw new SecurityException("Unknown package " + pkg + "\n" + re);
}
}
private final IBinder mService = new ILiveLockScreenManagerProvider.Stub() {
@Override
public void enqueueLiveLockScreen(String pkg, int id, LiveLockScreenInfo llsInfo,
int[] idReceived, int userId) throws RemoteException {
enforceAccessPermission();
enforceSamePackageOrSystem(pkg, llsInfo);
BaseLiveLockManagerService.this.enqueueLiveLockScreen(pkg, id, llsInfo, idReceived,
userId);
}
@Override
public void cancelLiveLockScreen(String pkg, int id, int userId) throws RemoteException {
enforceAccessPermission();
BaseLiveLockManagerService.this.cancelLiveLockScreen(pkg, id, userId);
}
@Override
public LiveLockScreenInfo getCurrentLiveLockScreen() throws RemoteException {
enforceAccessPermission();
return BaseLiveLockManagerService.this.getCurrentLiveLockScreen();
}
@Override
public void updateDefaultLiveLockScreen(LiveLockScreenInfo llsInfo) throws RemoteException {
enforcePrivateAccessPermission();
BaseLiveLockManagerService.this.updateDefaultLiveLockScreen(llsInfo);
}
@Override
public boolean getLiveLockScreenEnabled() throws RemoteException {
enforceAccessPermission();
return BaseLiveLockManagerService.this.getLiveLockScreenEnabled();
}
@Override
public boolean registerChangeListener(
ILiveLockScreenChangeListener listener) throws RemoteException {
enforcePrivateAccessPermission();
return BaseLiveLockManagerService.this.registerChangeListener(listener);
}
@Override
public boolean unregisterChangeListener(
ILiveLockScreenChangeListener listener) throws RemoteException {
enforcePrivateAccessPermission();
return BaseLiveLockManagerService.this.unregisterChangeListener(listener);
}
};
}
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