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      1 /*
      2  * Copyright (C) 2017 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 package com.android.server.am;
     18 
     19 import static com.android.server.am.ActivityManagerDebugConfig.TAG_AM;
     20 import static com.android.server.am.ActivityManagerDebugConfig.TAG_WITH_CLASS_NAME;
     21 
     22 import android.app.IAssistDataReceiver;
     23 import android.graphics.Bitmap;
     24 import android.os.Binder;
     25 import android.os.Bundle;
     26 import android.os.RemoteException;
     27 import android.util.Log;
     28 
     29 import com.android.server.am.AssistDataRequester.AssistDataRequesterCallbacks;
     30 
     31 /**
     32  * Proxies assist data to the given receiver, skipping all callbacks if the receiver dies.
     33  */
     34 class AssistDataReceiverProxy implements AssistDataRequesterCallbacks,
     35         Binder.DeathRecipient {
     36 
     37     private static final String TAG = TAG_WITH_CLASS_NAME ? "AssistDataReceiverProxy" : TAG_AM;
     38 
     39     private String mCallerPackage;
     40     private IAssistDataReceiver mReceiver;
     41 
     42     public AssistDataReceiverProxy(IAssistDataReceiver receiver, String callerPackage) {
     43         mReceiver = receiver;
     44         mCallerPackage = callerPackage;
     45         linkToDeath();
     46     }
     47 
     48     @Override
     49     public boolean canHandleReceivedAssistDataLocked() {
     50         // We are forwarding, so we can always receive this data
     51         return true;
     52     }
     53 
     54     @Override
     55     public void onAssistDataReceivedLocked(Bundle data, int activityIndex, int activityCount) {
     56         if (mReceiver != null) {
     57             try {
     58                 mReceiver.onHandleAssistData(data);
     59             } catch (RemoteException e) {
     60                 Log.w(TAG, "Failed to proxy assist data to receiver in package="
     61                         + mCallerPackage, e);
     62             }
     63         }
     64     }
     65 
     66     @Override
     67     public void onAssistScreenshotReceivedLocked(Bitmap screenshot) {
     68         if (mReceiver != null) {
     69             try {
     70                 mReceiver.onHandleAssistScreenshot(screenshot);
     71             } catch (RemoteException e) {
     72                 Log.w(TAG, "Failed to proxy assist screenshot to receiver in package="
     73                         + mCallerPackage, e);
     74             }
     75         }
     76     }
     77 
     78     @Override
     79     public void onAssistRequestCompleted() {
     80         unlinkToDeath();
     81     }
     82 
     83     @Override
     84     public void binderDied() {
     85         unlinkToDeath();
     86     }
     87 
     88     private void linkToDeath() {
     89         try {
     90             mReceiver.asBinder().linkToDeath(this, 0);
     91         } catch (RemoteException e) {
     92             Log.w(TAG, "Could not link to client death", e);
     93         }
     94     }
     95 
     96     private void unlinkToDeath() {
     97         if (mReceiver != null) {
     98             mReceiver.asBinder().unlinkToDeath(this, 0);
     99         }
    100         mReceiver = null;
    101     }
    102 }