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      1 /*
      2  * Copyright (C) 2015 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 android.app;
     18 
     19 import android.annotation.SystemApi;
     20 import android.app.Service;
     21 import android.content.Context;
     22 import android.content.Intent;
     23 import android.content.pm.EphemeralResolveInfo;
     24 import android.os.Bundle;
     25 import android.os.Handler;
     26 import android.os.IBinder;
     27 import android.os.IRemoteCallback;
     28 import android.os.Looper;
     29 import android.os.Message;
     30 import android.os.RemoteException;
     31 
     32 import java.util.List;
     33 
     34 /**
     35  * Base class for implementing the resolver service.
     36  * @hide
     37  */
     38 @SystemApi
     39 public abstract class EphemeralResolverService extends Service {
     40     public static final String EXTRA_RESOLVE_INFO = "android.app.extra.RESOLVE_INFO";
     41     public static final String EXTRA_SEQUENCE = "android.app.extra.SEQUENCE";
     42     private static final String EXTRA_PREFIX = "android.app.PREFIX";
     43     private Handler mHandler;
     44 
     45     /**
     46      * Called to retrieve resolve info for ephemeral applications.
     47      *
     48      * @param digestPrefix The hash prefix of the ephemeral's domain.
     49      * @param prefixMask A mask that was applied to each digest prefix. This should
     50      *      be used when comparing against the digest prefixes as all bits might
     51      *      not be set.
     52      */
     53     public abstract List<EphemeralResolveInfo> onEphemeralResolveInfoList(
     54             int digestPrefix[], int prefixMask);
     55 
     56     @Override
     57     public final void attachBaseContext(Context base) {
     58         super.attachBaseContext(base);
     59         mHandler = new ServiceHandler(base.getMainLooper());
     60     }
     61 
     62     @Override
     63     public final IBinder onBind(Intent intent) {
     64         return new IEphemeralResolver.Stub() {
     65             @Override
     66             public void getEphemeralResolveInfoList(
     67                     IRemoteCallback callback, int digestPrefix[], int prefixMask, int sequence) {
     68                 final Message msg = mHandler.obtainMessage(
     69                         ServiceHandler.MSG_GET_EPHEMERAL_RESOLVE_INFO, prefixMask, sequence, callback);
     70                 final Bundle data = new Bundle();
     71                 data.putIntArray(EXTRA_PREFIX, digestPrefix);
     72                 msg.setData(data);
     73                 msg.sendToTarget();
     74             }
     75         };
     76     }
     77 
     78     private final class ServiceHandler extends Handler {
     79         public static final int MSG_GET_EPHEMERAL_RESOLVE_INFO = 1;
     80 
     81         public ServiceHandler(Looper looper) {
     82             super(looper, null /*callback*/, true /*async*/);
     83         }
     84 
     85         @Override
     86         @SuppressWarnings("unchecked")
     87         public void handleMessage(Message message) {
     88             final int action = message.what;
     89             switch (action) {
     90                 case MSG_GET_EPHEMERAL_RESOLVE_INFO: {
     91                     final IRemoteCallback callback = (IRemoteCallback) message.obj;
     92                     final int[] digestPrefix = message.getData().getIntArray(EXTRA_PREFIX);
     93                     final List<EphemeralResolveInfo> resolveInfo =
     94                             onEphemeralResolveInfoList(digestPrefix, message.arg1);
     95                     final Bundle data = new Bundle();
     96                     data.putInt(EXTRA_SEQUENCE, message.arg2);
     97                     data.putParcelableList(EXTRA_RESOLVE_INFO, resolveInfo);
     98                     try {
     99                         callback.sendResult(data);
    100                     } catch (RemoteException e) {
    101                     }
    102                 } break;
    103 
    104                 default: {
    105                     throw new IllegalArgumentException("Unknown message: " + action);
    106                 }
    107             }
    108         }
    109     }
    110 }
    111