Home | History | Annotate | Download | only in downloads
      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 import android.util.Log;
     23 
     24 public class DownloadDrmHelper {
     25 
     26     /** The MIME type of special DRM files */
     27     public static final String MIMETYPE_DRM_MESSAGE = "application/vnd.oma.drm.message";
     28 
     29     /** The extensions of special DRM files */
     30     public static final String EXTENSION_DRM_MESSAGE = ".dm";
     31 
     32     public static final String EXTENSION_INTERNAL_FWDL = ".fl";
     33 
     34     /**
     35      * Checks if the Media Type is a DRM Media Type
     36      *
     37      * @param drmManagerClient A DrmManagerClient
     38      * @param mimetype Media Type to check
     39      * @return True if the Media Type is DRM else false
     40      */
     41     public static boolean isDrmMimeType(Context context, String mimetype) {
     42         boolean result = false;
     43         if (context != null) {
     44             try {
     45                 DrmManagerClient drmClient = new DrmManagerClient(context);
     46                 if (drmClient != null && mimetype != null && mimetype.length() > 0) {
     47                     result = drmClient.canHandle("", mimetype);
     48                 }
     49             } catch (IllegalArgumentException e) {
     50                 Log.w(Constants.TAG,
     51                         "DrmManagerClient instance could not be created, context is Illegal.");
     52             } catch (IllegalStateException e) {
     53                 Log.w(Constants.TAG, "DrmManagerClient didn't initialize properly.");
     54             }
     55         }
     56         return result;
     57     }
     58 
     59     /**
     60      * Checks if the Media Type needs to be DRM converted
     61      *
     62      * @param mimetype Media type of the content
     63      * @return True if convert is needed else false
     64      */
     65     public static boolean isDrmConvertNeeded(String mimetype) {
     66         return MIMETYPE_DRM_MESSAGE.equals(mimetype);
     67     }
     68 
     69     /**
     70      * Modifies the file extension for a DRM Forward Lock file NOTE: This
     71      * function shouldn't be called if the file shouldn't be DRM converted
     72      */
     73     public static String modifyDrmFwLockFileExtension(String filename) {
     74         if (filename != null) {
     75             int extensionIndex;
     76             extensionIndex = filename.lastIndexOf(".");
     77             if (extensionIndex != -1) {
     78                 filename = filename.substring(0, extensionIndex);
     79             }
     80             filename = filename.concat(EXTENSION_INTERNAL_FWDL);
     81         }
     82         return filename;
     83     }
     84 
     85     /**
     86      * Gets the original mime type of DRM protected content.
     87      *
     88      * @param context The context
     89      * @param path Path to the file
     90      * @param containingMime The current mime type of of the file i.e. the
     91      *            containing mime type
     92      * @return The original mime type of the file if DRM protected else the
     93      *         currentMime
     94      */
     95     public static String getOriginalMimeType(Context context, String path, String containingMime) {
     96         String result = containingMime;
     97         DrmManagerClient drmClient = new DrmManagerClient(context);
     98         try {
     99             if (drmClient.canHandle(path, null)) {
    100                 result = drmClient.getOriginalMimeType(path);
    101             }
    102         } catch (IllegalArgumentException ex) {
    103             Log.w(Constants.TAG,
    104                     "Can't get original mime type since path is null or empty string.");
    105         } catch (IllegalStateException ex) {
    106             Log.w(Constants.TAG, "DrmManagerClient didn't initialize properly.");
    107         }
    108         return result;
    109     }
    110 }
    111