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      1 /*
      2  * Copyright (C) 2012 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.messaging.mmslib.util;
     19 
     20 import android.content.Context;
     21 import android.drm.DrmManagerClient;
     22 import android.util.Log;
     23 
     24 public class DownloadDrmHelper {
     25     private static final String TAG = "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 is a DRM Media Type
     37      *
     38      * @param drmManagerClient A DrmManagerClient
     39      * @param mimetype         Media Type to check
     40      * @return True if the Media Type is DRM else false
     41      */
     42     public static boolean isDrmMimeType(Context context, String mimetype) {
     43         boolean result = false;
     44         if (context != null) {
     45             try {
     46                 DrmManagerClient drmClient = new DrmManagerClient(context);
     47                 if (drmClient != null && mimetype != null && mimetype.length() > 0) {
     48                     result = drmClient.canHandle("", mimetype);
     49                 }
     50             } catch (IllegalArgumentException e) {
     51                 Log.w(TAG,
     52                         "DrmManagerClient instance could not be created, context is Illegal.");
     53             } catch (IllegalStateException e) {
     54                 Log.w(TAG, "DrmManagerClient didn't initialize properly.");
     55             }
     56         }
     57         return result;
     58     }
     59 
     60     /**
     61      * Checks if the Media Type needs to be DRM converted
     62      *
     63      * @param mimetype Media type of the content
     64      * @return True if convert is needed else false
     65      */
     66     public static boolean isDrmConvertNeeded(String mimetype) {
     67         return MIMETYPE_DRM_MESSAGE.equals(mimetype);
     68     }
     69 
     70     /**
     71      * Modifies the file extension for a DRM Forward Lock file NOTE: This
     72      * function shouldn't be called if the file shouldn't be DRM converted
     73      */
     74     public static String modifyDrmFwLockFileExtension(String filename) {
     75         if (filename != null) {
     76             int extensionIndex;
     77             extensionIndex = filename.lastIndexOf(".");
     78             if (extensionIndex != -1) {
     79                 filename = filename.substring(0, extensionIndex);
     80             }
     81             filename = filename.concat(EXTENSION_INTERNAL_FWDL);
     82         }
     83         return filename;
     84     }
     85 
     86     /**
     87      * Gets the original mime type of DRM protected content.
     88      *
     89      * @param context        The context
     90      * @param path           Path to the file
     91      * @param containingMime The current mime type of of the file i.e. the
     92      *                       containing mime type
     93      * @return The original mime type of the file if DRM protected else the
     94      *         currentMime
     95      */
     96     public static String getOriginalMimeType(Context context, String path, String containingMime) {
     97         String result = containingMime;
     98         DrmManagerClient drmClient = new DrmManagerClient(context);
     99         try {
    100             if (drmClient.canHandle(path, null)) {
    101                 result = drmClient.getOriginalMimeType(path);
    102             }
    103         } catch (IllegalArgumentException ex) {
    104             Log.w(TAG,
    105                     "Can't get original mime type since path is null or empty string.");
    106         } catch (IllegalStateException ex) {
    107             Log.w(TAG, "DrmManagerClient didn't initialize properly.");
    108         }
    109         return result;
    110     }
    111 }
    112