Home | History | Annotate | Download | only in mbms 
      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.telephony.MbmsDownloadSession;
     26 import android.telephony.MbmsStreamingSession;
     27 import android.util.Log;
     28 
     29 import java.io.File;
     30 import java.io.IOException;
     31 import java.util.List;
     32 
     33 /**
     34  * @hide
     35  */
     36 public class MbmsUtils {
     37     private static final String LOG_TAG = "MbmsUtils";
     38 
     39     public static boolean isContainedIn(File parent, File child) {
     40         try {
     41             String parentPath = parent.getCanonicalPath();
     42             String childPath = child.getCanonicalPath();
     43             return childPath.startsWith(parentPath);
     44         } catch (IOException e) {
     45             throw new RuntimeException("Failed to resolve canonical paths: " + e);
     46         }
     47     }
     48 
     49     public static ComponentName toComponentName(ComponentInfo ci) {
     50         return new ComponentName(ci.packageName, ci.name);
     51     }
     52 
     53     public static ComponentName getOverrideServiceName(Context context, String serviceAction) {
     54         String metaDataKey = null;
     55         switch (serviceAction) {
     56             case MbmsDownloadSession.MBMS_DOWNLOAD_SERVICE_ACTION:
     57                 metaDataKey = MbmsDownloadSession.MBMS_DOWNLOAD_SERVICE_OVERRIDE_METADATA;
     58                 break;
     59             case MbmsStreamingSession.MBMS_STREAMING_SERVICE_ACTION:
     60                 metaDataKey = MbmsStreamingSession.MBMS_STREAMING_SERVICE_OVERRIDE_METADATA;
     61                 break;
     62         }
     63         if (metaDataKey == null) {
     64             return null;
     65         }
     66 
     67         ApplicationInfo appInfo;
     68         try {
     69             appInfo = context.getPackageManager()
     70                     .getApplicationInfo(context.getPackageName(), PackageManager.GET_META_DATA);
     71         } catch (PackageManager.NameNotFoundException e) {
     72             return null;
     73         }
     74         if (appInfo.metaData == null) {
     75             return null;
     76         }
     77         String serviceComponent = appInfo.metaData.getString(metaDataKey);
     78         if (serviceComponent == null) {
     79             return null;
     80         }
     81         return ComponentName.unflattenFromString(serviceComponent);
     82     }
     83 
     84     public static ServiceInfo getMiddlewareServiceInfo(Context context, String serviceAction) {
     85         // Query for the proper service
     86         PackageManager packageManager = context.getPackageManager();
     87         Intent queryIntent = new Intent();
     88         queryIntent.setAction(serviceAction);
     89 
     90         ComponentName overrideService = getOverrideServiceName(context, serviceAction);
     91         List<ResolveInfo> services;
     92         if (overrideService == null) {
     93             services = packageManager.queryIntentServices(queryIntent,
     94                     PackageManager.MATCH_SYSTEM_ONLY);
     95         } else {
     96             queryIntent.setComponent(overrideService);
     97             services = packageManager.queryIntentServices(queryIntent,
     98                     PackageManager.MATCH_ALL);
     99         }
    100 
    101         if (services == null || services.size() == 0) {
    102             Log.w(LOG_TAG, "No MBMS services found, cannot get service info");
    103             return null;
    104         }
    105 
    106         if (services.size() > 1) {
    107             Log.w(LOG_TAG, "More than one MBMS service found, cannot get unique service");
    108             return null;
    109         }
    110         return services.get(0).serviceInfo;
    111     }
    112 
    113     public static int startBinding(Context context, String serviceAction,
    114             ServiceConnection serviceConnection) {
    115         Intent bindIntent = new Intent();
    116         ServiceInfo mbmsServiceInfo =
    117                 MbmsUtils.getMiddlewareServiceInfo(context, serviceAction);
    118 
    119         if (mbmsServiceInfo == null) {
    120             return MbmsErrors.ERROR_NO_UNIQUE_MIDDLEWARE;
    121         }
    122 
    123         bindIntent.setComponent(MbmsUtils.toComponentName(mbmsServiceInfo));
    124 
    125         context.bindService(bindIntent, serviceConnection, Context.BIND_AUTO_CREATE);
    126         return MbmsErrors.SUCCESS;
    127     }
    128 
    129     /**
    130      * Returns a File linked to the directory used to store temp files for this file service
    131      */
    132     public static File getEmbmsTempFileDirForService(Context context, String serviceId) {
    133         // Replace all non-alphanumerics/underscores with an underscore. Some filesystems don't
    134         // like special characters.
    135         String sanitizedServiceId = serviceId.replaceAll("[^a-zA-Z0-9_]", "_");
    136 
    137         File embmsTempFileDir = MbmsTempFileProvider.getEmbmsTempFileDir(context);
    138 
    139         return new File(embmsTempFileDir, sanitizedServiceId);
    140     }
    141 }
    142