Ticket #19036: 19036-1.diff

django/http/multipartparser.py

@@ -199 +199 @@
                         for chunk in field_stream:
                             if transfer_encoding == 'base64':
                                 # We only special-case base64 transfer encoding
+                                # We should always read base64 streams by multiple of 4
+                                over_bytes = len(chunk) % 4
+                                if over_bytes:
+                                    over_chunk = field_stream.read(4 - over_bytes)
+                                    chunk += over_chunk
+
                                 try:
                                     chunk = base64.b64decode(chunk)
                                 except Exception as e:

tests/regressiontests/file_uploads/tests.py

@@ -60 +60 @@
 
         self.assertEqual(response.status_code, 200)
 
-    def test_base64_upload(self):
-        test_string = "This data will be transmitted base64-encoded."
+    def _test_base64_upload(self, content):
         payload = "\r\n".join([
             '--' + client.BOUNDARY,
             'Content-Disposition: form-data; name="file"; filename="test.txt"',
             'Content-Type: application/octet-stream',
             'Content-Transfer-Encoding: base64',
             '',
-            base64.b64encode(force_bytes(test_string)).decode('ascii'),
+            base64.b64encode(force_bytes(content)).decode('ascii'),
             '--' + client.BOUNDARY + '--',
             '',
         ]).encode('utf-8')
@@ -82 +81 @@
         response = self.client.request(**r)
         received = json.loads(response.content.decode('utf-8'))
 
-        self.assertEqual(received['file'], test_string)
+        self.assertEqual(received['file'], content)
+
+    def test_base64_upload(self):
+        self._test_base64_upload("This data will be transmitted base64-encoded.")
+
+    def test_big_base64_upload(self):
+        self._test_base64_upload("Big data" * 68000)  # > 512Kb
 
     def test_unicode_file_name(self):
         tdir = tempfile.gettempdir()