Small fixes to bugs in the streaming handler for use with magic and radosgw.

data/userfiles.py

@@ -5,6 +5,8 @@ import magic
 from uuid import uuid4
 from flask import url_for, request, send_file, make_response, abort
 from flask.views import View
+from io import BufferedReader
+
 
 logger = logging.getLogger(__name__)
 
@@ -22,7 +24,9 @@ class UserfilesHandlers(View):
     path = self._files.get_file_id_path(file_id)
     try:
       file_stream = self._storage.stream_read_file(self._locations, path)
-      return send_file(file_stream)
+      buffered = BufferedReader(file_stream)
+      file_header_bytes = buffered.peek(1024)
+      return send_file(buffered, mimetype=self._magic.from_buffer(file_header_bytes))
     except IOError:
       abort(404)