content: /*
   * 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 android.telephony.mbms;
  
  import android.content.ComponentName;
  import android.content.Context;
  import android.content.Intent;
  import android.content.ServiceConnection;
  import android.content.pm.*;
  import android.content.pm.ServiceInfo;
  import android.telephony.MbmsDownloadSession;
  import android.telephony.MbmsGroupCallSession;
  import android.telephony.MbmsStreamingSession;
  import android.util.Log;
  
  import java.io.File;
  import java.io.IOException;
  import java.util.List;
  
  /**
   * @hide
   */
  public class MbmsUtils {
      private static final String LOG_TAG = "MbmsUtils";
  
      public static boolean isContainedIn(File parent, File child) {
          try {
              String parentPath = parent.getCanonicalPath();
              String childPath = child.getCanonicalPath();
              return childPath.startsWith(parentPath);
          } catch (IOException e) {
              throw new RuntimeException("Failed to resolve canonical paths: " + e);
          }
      }
  
      public static ComponentName toComponentName(ComponentInfo ci) {
          return new ComponentName(ci.packageName, ci.name);
      }
  
      public static ComponentName getOverrideServiceName(Context context, String serviceAction) {
          String metaDataKey = null;
          switch (serviceAction) {
              case MbmsDownloadSession.MBMS_DOWNLOAD_SERVICE_ACTION:
                  metaDataKey = MbmsDownloadSession.MBMS_DOWNLOAD_SERVICE_OVERRIDE_METADATA;
                  break;
              case MbmsStreamingSession.MBMS_STREAMING_SERVICE_ACTION:
                  metaDataKey = MbmsStreamingSession.MBMS_STREAMING_SERVICE_OVERRIDE_METADATA;
                  break;
              case MbmsGroupCallSession.MBMS_GROUP_CALL_SERVICE_ACTION:
                  metaDataKey = MbmsGroupCallSession.MBMS_GROUP_CALL_SERVICE_OVERRIDE_METADATA;
                  break;
          }
          if (metaDataKey == null) {
              return null;
          }
  
          ApplicationInfo appInfo;
          try {
              appInfo = context.getPackageManager()
                      .getApplicationInfo(context.getPackageName(), PackageManager.GET_META_DATA);
          } catch (PackageManager.NameNotFoundException e) {
              return null;
          }
          if (appInfo.metaData == null) {
              return null;
          }
          String serviceComponent = appInfo.metaData.getString(metaDataKey);
          if (serviceComponent == null) {
              return null;
          }
          return ComponentName.unflattenFromString(serviceComponent);
      }
  
      public static ServiceInfo getMiddlewareServiceInfo(Context context, String serviceAction) {
          // Query for the proper service
          PackageManager packageManager = context.getPackageManager();
          Intent queryIntent = new Intent();
          queryIntent.setAction(serviceAction);
  
          ComponentName overrideService = getOverrideServiceName(context, serviceAction);
          List<ResolveInfo> services;
          if (overrideService == null) {
              services = packageManager.queryIntentServices(queryIntent,
                      PackageManager.MATCH_SYSTEM_ONLY);
          } else {
              queryIntent.setComponent(overrideService);
              services = packageManager.queryIntentServices(queryIntent,
                      PackageManager.MATCH_ALL);
          }
  
          if (services == null || services.size() == 0) {
              Log.w(LOG_TAG, "No MBMS services found, cannot get service info");
              return null;
          }
  
          if (services.size() > 1) {
              Log.w(LOG_TAG, "More than one MBMS service found, cannot get unique service");
              return null;
          }
          return services.get(0).serviceInfo;
      }
  
      public static int startBinding(Context context, String serviceAction,
              ServiceConnection serviceConnection) {
          Intent bindIntent = new Intent();
          ServiceInfo mbmsServiceInfo =
                  MbmsUtils.getMiddlewareServiceInfo(context, serviceAction);
  
          if (mbmsServiceInfo == null) {
              return MbmsErrors.ERROR_NO_UNIQUE_MIDDLEWARE;
          }
  
          bindIntent.setComponent(MbmsUtils.toComponentName(mbmsServiceInfo));
  
          context.bindService(bindIntent, serviceConnection, Context.BIND_AUTO_CREATE);
          return MbmsErrors.SUCCESS;
      }
  
      /**
       * Returns a File linked to the directory used to store temp files for this file service
       */
      public static File getEmbmsTempFileDirForService(Context context, String serviceId) {
          // Replace all non-alphanumerics/underscores with an underscore. Some filesystems don't
          // like special characters.
          String sanitizedServiceId = serviceId.replaceAll("[^a-zA-Z0-9_]", "_");
  
          File embmsTempFileDir = MbmsTempFileProvider.getEmbmsTempFileDir(context);
  
          return new File(embmsTempFileDir, sanitizedServiceId);
      }
  }
  