Find mime from file extension if the mime is empty

Fix for bug 3170039

Change-Id: I6d32ae157ec276575aad8fbcd73f02c48fe219d0

1 files changed, 12 insertions, 0 deletions

diff --git a/core/java/android/webkit/BrowserFrame.java b/core/java/android/webkit/BrowserFrame.java
index d3c0ffd..61a30ab 100644
--- a/core/java/android/webkit/BrowserFrame.java
+++ b/core/java/android/webkit/BrowserFrame.java
@@ -1075,6 +1075,18 @@ class BrowserFrame extends Handler {
      */
     private void downloadStart(String url, String userAgent,
             String contentDisposition, String mimeType, long contentLength) {
+        // This will only work if the url ends with the filename
+        if (mimeType.isEmpty()) {
+            try {
+                String extension = url.substring(url.lastIndexOf('.') + 1);
+                mimeType = libcore.net.MimeUtils.guessMimeTypeFromExtension(extension);
+                // MimeUtils might return null, not sure if downloadmanager is happy with that
+                if (mimeType == null)
+                    mimeType = "";
+            } catch(IndexOutOfBoundsException exception) {
+                // mimeType string end with a '.', not much to do
+            }
+        }
         mimeType = MimeTypeMap.getSingleton().remapGenericMimeType(
                 mimeType, url, contentDisposition);
         mCallbackProxy.onDownloadStart(url, userAgent,