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/*
* Copyright (C) 2017 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.am;
import static com.android.server.am.ActivityStackSupervisor.MATCH_TASK_IN_STACKS_OR_RECENT_TASKS;
import static com.android.server.am.ActivityStackSupervisor.REMOVE_FROM_RECENTS;
import android.app.ActivityManager;
import android.app.ActivityOptions;
import android.app.IAppTask;
import android.app.IApplicationThread;
import android.content.Intent;
import android.os.Binder;
import android.os.Bundle;
import android.os.IBinder;
import android.os.UserHandle;
/**
* An implementation of IAppTask, that allows an app to manage its own tasks via
* {@link android.app.ActivityManager.AppTask}. We keep track of the callingUid to ensure that
* only the process that calls getAppTasks() can call the AppTask methods.
*/
class AppTaskImpl extends IAppTask.Stub {
private ActivityManagerService mService;
private int mTaskId;
private int mCallingUid;
public AppTaskImpl(ActivityManagerService service, int taskId, int callingUid) {
mService = service;
mTaskId = taskId;
mCallingUid = callingUid;
}
private void checkCaller() {
if (mCallingUid != Binder.getCallingUid()) {
throw new SecurityException("Caller " + mCallingUid
+ " does not match caller of getAppTasks(): " + Binder.getCallingUid());
}
}
@Override
public void finishAndRemoveTask() {
checkCaller();
synchronized (mService) {
long origId = Binder.clearCallingIdentity();
try {
// We remove the task from recents to preserve backwards
if (!mService.mStackSupervisor.removeTaskByIdLocked(mTaskId, false,
REMOVE_FROM_RECENTS, "finish-and-remove-task")) {
throw new IllegalArgumentException("Unable to find task ID " + mTaskId);
}
} finally {
Binder.restoreCallingIdentity(origId);
}
}
}
@Override
public ActivityManager.RecentTaskInfo getTaskInfo() {
checkCaller();
synchronized (mService) {
long origId = Binder.clearCallingIdentity();
try {
TaskRecord tr = mService.mStackSupervisor.anyTaskForIdLocked(mTaskId,
MATCH_TASK_IN_STACKS_OR_RECENT_TASKS);
if (tr == null) {
throw new IllegalArgumentException("Unable to find task ID " + mTaskId);
}
return mService.getRecentTasks().createRecentTaskInfo(tr);
} finally {
Binder.restoreCallingIdentity(origId);
}
}
}
@Override
public void moveToFront() {
checkCaller();
// Will bring task to front if it already has a root activity.
final int callingPid = Binder.getCallingPid();
final int callingUid = Binder.getCallingUid();
final long origId = Binder.clearCallingIdentity();
try {
synchronized (this) {
mService.mStackSupervisor.startActivityFromRecents(callingPid, callingUid, mTaskId,
null);
}
} finally {
Binder.restoreCallingIdentity(origId);
}
}
@Override
public int startActivity(IBinder whoThread, String callingPackage,
Intent intent, String resolvedType, Bundle bOptions) {
checkCaller();
int callingUser = UserHandle.getCallingUserId();
TaskRecord tr;
IApplicationThread appThread;
synchronized (mService) {
tr = mService.mStackSupervisor.anyTaskForIdLocked(mTaskId,
MATCH_TASK_IN_STACKS_OR_RECENT_TASKS);
if (tr == null) {
throw new IllegalArgumentException("Unable to find task ID " + mTaskId);
}
appThread = IApplicationThread.Stub.asInterface(whoThread);
if (appThread == null) {
throw new IllegalArgumentException("Bad app thread " + appThread);
}
}
return mService.getActivityStartController().obtainStarter(intent, "AppTaskImpl")
.setCaller(appThread)
.setCallingPackage(callingPackage)
.setResolvedType(resolvedType)
.setActivityOptions(bOptions)
.setMayWait(callingUser)
.setInTask(tr)
.execute();
}
@Override
public void setExcludeFromRecents(boolean exclude) {
checkCaller();
synchronized (mService) {
long origId = Binder.clearCallingIdentity();
try {
TaskRecord tr = mService.mStackSupervisor.anyTaskForIdLocked(mTaskId,
MATCH_TASK_IN_STACKS_OR_RECENT_TASKS);
if (tr == null) {
throw new IllegalArgumentException("Unable to find task ID " + mTaskId);
}
Intent intent = tr.getBaseIntent();
if (exclude) {
intent.addFlags(Intent.FLAG_ACTIVITY_EXCLUDE_FROM_RECENTS);
} else {
intent.setFlags(intent.getFlags()
& ~Intent.FLAG_ACTIVITY_EXCLUDE_FROM_RECENTS);
}
} finally {
Binder.restoreCallingIdentity(origId);
}
}
}
}
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