Allowing metadata to be read from blob urls

content/public/android/java/src/org/chromium/content/browser/MediaResourceGetter.java

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 package org.chromium.content.browser;
 
 import android.content.Context;
 import android.content.pm.PackageManager;
 import android.media.MediaMetadataRetriever;
 import android.net.ConnectivityManager;
@@ skipping 19 matching lines @@
  * Java counterpart of android MediaResourceGetter.
  */
 @JNINamespace("content")
 class MediaResourceGetter {
 
     private static final String TAG = "MediaResourceGetter";
     private final MediaMetadata EMPTY_METADATA = new MediaMetadata(0,0,0,false);
 
     private final MediaMetadataRetriever mRetriever = new MediaMetadataRetriever();
 
+    private static String PACKAGE_NAME = null;
+
     @VisibleForTesting
     static class MediaMetadata {
         private final int mDurationInMilliseconds;
         private final int mWidth;
         private final int mHeight;
         private final boolean mSuccess;
 
         MediaMetadata(int durationInMilliseconds, int width, int height, boolean success) {
             mDurationInMilliseconds = durationInMilliseconds;
             mWidth = width;
@@ skipping 56 matching lines @@
                 return false;
             return true;
         }
     }
 
     @CalledByNative
     private static MediaMetadata extractMediaMetadata(final Context context,
                                                       final String url,
                                                       final String cookies,
                                                       final String userAgent) {
+        PACKAGE_NAME = context.getPackageName();
         return new MediaResourceGetter().extract(
                 context, url, cookies, userAgent);
     }
 
     @VisibleForTesting
     MediaMetadata extract(final Context context, final String url,
                           final String cookies, final String userAgent) {
         if (!androidDeviceOk(android.os.Build.MODEL, android.os.Build.VERSION.SDK_INT)) {
             return EMPTY_METADATA;
         }
@@ skipping 211 matching lines @@
             Log.d(TAG, "no active network");
             return null;
         }
         return info.getType();
     }
 
     private List<String> getRawAcceptableDirectories() {
         List<String> result = new ArrayList<String>();
         result.add("/mnt/sdcard/");
         result.add("/sdcard/");
+        result.add("/data/data/" + PACKAGE_NAME + "/cache/");

[qinmin, 2014/08/13 17:33:59]

add a check here that PACKAGE_NAME cannot be null

         return result;
     }
 
     private List<String> canonicalize(List<String> paths) {
         List<String> result = new ArrayList<String>(paths.size());
         try {
             for (String path : paths) {
                 result.add(new File(path).getCanonicalPath());
             }
             return result;
@@ skipping 17 matching lines @@
     @VisibleForTesting
     void configure(String path) {
         mRetriever.setDataSource(path);
     }
 
     @VisibleForTesting
     String extractMetadata(int key) {
         return mRetriever.extractMetadata(key);
     }
 }