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      1 /*
      2  * Copyright (C) 2011 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 
     18 package com.android.providers.downloads;
     19 
     20 import android.content.Context;
     21 import android.drm.DrmManagerClient;
     22 
     23 import java.io.File;
     24 
     25 public class DownloadDrmHelper {
     26 
     27     /** The MIME type of special DRM files */
     28     public static final String MIMETYPE_DRM_MESSAGE = "application/vnd.oma.drm.message";
     29 
     30     /** The extensions of special DRM files */
     31     public static final String EXTENSION_DRM_MESSAGE = ".dm";
     32 
     33     public static final String EXTENSION_INTERNAL_FWDL = ".fl";
     34 
     35     /**
     36      * Checks if the Media Type needs to be DRM converted
     37      *
     38      * @param mimetype Media type of the content
     39      * @return True if convert is needed else false
     40      */
     41     public static boolean isDrmConvertNeeded(String mimetype) {
     42         return MIMETYPE_DRM_MESSAGE.equals(mimetype);
     43     }
     44 
     45     /**
     46      * Modifies the file extension for a DRM Forward Lock file NOTE: This
     47      * function shouldn't be called if the file shouldn't be DRM converted
     48      */
     49     public static String modifyDrmFwLockFileExtension(String filename) {
     50         if (filename != null) {
     51             int extensionIndex;
     52             extensionIndex = filename.lastIndexOf(".");
     53             if (extensionIndex != -1) {
     54                 filename = filename.substring(0, extensionIndex);
     55             }
     56             filename = filename.concat(EXTENSION_INTERNAL_FWDL);
     57         }
     58         return filename;
     59     }
     60 
     61     /**
     62      * Return the original MIME type of the given file, using the DRM framework
     63      * if the file is protected content.
     64      */
     65     public static String getOriginalMimeType(Context context, File file, String currentMime) {
     66         final DrmManagerClient client = new DrmManagerClient(context);
     67         try {
     68             final String rawFile = file.toString();
     69             if (client.canHandle(rawFile, null)) {
     70                 return client.getOriginalMimeType(rawFile);
     71             } else {
     72                 return currentMime;
     73             }
     74         } finally {
     75             client.release();
     76         }
     77     }
     78 }
     79