Fix encoded filename parsing to allow for lang

rest_framework/parsers.py

@@ -303,7 +303,7 @@ class FileUploadParser(BaseParser):
         """
         encoded_filename = force_text(disposition['filename*'])
         try:
-            charset, filename = encoded_filename.split('\'\'', 1)
+            charset, lang, filename = encoded_filename.split('\'', 2)
             filename = urlparse.unquote(filename)
         except (ValueError, LookupError):
             filename = force_text(disposition['filename'])

tests/test_parsers.py

@@ -127,6 +127,10 @@ class TestFileUploadParser(TestCase):
         filename = parser.get_filename(self.stream, None, self.parser_context)
         self.assertEqual(filename, 'ÀĥƦ.txt')
 
+        self.__replace_content_disposition('inline; filename=fallback.txt; filename*=utf-8\'en-us\'ÀĥƦ.txt')
+        filename = parser.get_filename(self.stream, None, self.parser_context)
+        self.assertEqual(filename, 'ÀĥƦ.txt')
+
         self.__replace_content_disposition('inline; filename=fallback.txt; filename*=utf-8--ÀĥƦ.txt')
         filename = parser.get_filename(self.stream, None, self.parser_context)
         self.assertEqual(filename, 'fallback.txt')