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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 android.telephony.mbms;
     18 
     19 import android.content.ComponentName;
     20 import android.content.Context;
     21 import android.content.Intent;
     22 import android.content.ServiceConnection;
     23 import android.content.pm.*;
     24 import android.content.pm.ServiceInfo;
     25 import android.util.Log;
     26 
     27 import java.io.File;
     28 import java.io.IOException;
     29 import java.util.List;
     30 
     31 /**
     32  * @hide
     33  */
     34 public class MbmsUtils {
     35     private static final String LOG_TAG = "MbmsUtils";
     36 
     37     public static boolean isContainedIn(File parent, File child) {
     38         try {
     39             String parentPath = parent.getCanonicalPath();
     40             String childPath = child.getCanonicalPath();
     41             return childPath.startsWith(parentPath);
     42         } catch (IOException e) {
     43             throw new RuntimeException("Failed to resolve canonical paths: " + e);
     44         }
     45     }
     46 
     47     public static ComponentName toComponentName(ComponentInfo ci) {
     48         return new ComponentName(ci.packageName, ci.name);
     49     }
     50 
     51     public static ServiceInfo getMiddlewareServiceInfo(Context context, String serviceAction) {
     52         // Query for the proper service
     53         PackageManager packageManager = context.getPackageManager();
     54         Intent queryIntent = new Intent();
     55         queryIntent.setAction(serviceAction);
     56         List<ResolveInfo> downloadServices = packageManager.queryIntentServices(queryIntent,
     57                 PackageManager.MATCH_SYSTEM_ONLY);
     58 
     59         if (downloadServices == null || downloadServices.size() == 0) {
     60             Log.w(LOG_TAG, "No download services found, cannot get service info");
     61             return null;
     62         }
     63 
     64         if (downloadServices.size() > 1) {
     65             Log.w(LOG_TAG, "More than one download service found, cannot get unique service");
     66             return null;
     67         }
     68         return downloadServices.get(0).serviceInfo;
     69     }
     70 
     71     public static int startBinding(Context context, String serviceAction,
     72             ServiceConnection serviceConnection) {
     73         Intent bindIntent = new Intent();
     74         ServiceInfo mbmsServiceInfo =
     75                 MbmsUtils.getMiddlewareServiceInfo(context, serviceAction);
     76 
     77         if (mbmsServiceInfo == null) {
     78             return MbmsErrors.ERROR_NO_UNIQUE_MIDDLEWARE;
     79         }
     80 
     81         bindIntent.setComponent(MbmsUtils.toComponentName(mbmsServiceInfo));
     82 
     83         context.bindService(bindIntent, serviceConnection, Context.BIND_AUTO_CREATE);
     84         return MbmsErrors.SUCCESS;
     85     }
     86 
     87     /**
     88      * Returns a File linked to the directory used to store temp files for this file service
     89      */
     90     public static File getEmbmsTempFileDirForService(Context context, String serviceId) {
     91         File embmsTempFileDir = MbmsTempFileProvider.getEmbmsTempFileDir(context);
     92 
     93         return new File(embmsTempFileDir, serviceId);
     94     }
     95 }
     96