Handle missing Content-Type header when accessing remote media (#11200)

* add code to handle missing content-type header and a test to verify that it works

* add handling for missing content-type in the /upload endpoint as well

* slightly refactor test code to put private method in approriate place

* handle possible null value for content-type when pulling from the local db

* add changelog

* refactor test and add code to handle missing content-type in cached remote media

* requested changes

* Update changelog.d/11200.bugfix

Co-authored-by: Sean Quah <8349537+squahtx@users.noreply.github.com>

Co-authored-by: Sean Quah <8349537+squahtx@users.noreply.github.com>

1 files changed, 16 insertions, 2 deletions

diff --git a/tests/rest/media/v1/test_media_storage.py b/tests/rest/media/v1/test_media_storage.py
index 4ae00755c9..4cf1ed5ddf 100644
--- a/tests/rest/media/v1/test_media_storage.py
+++ b/tests/rest/media/v1/test_media_storage.py
@@ -248,7 +248,7 @@ class MediaRepoTests(unittest.HomeserverTestCase):
 
         self.media_id = "example.com/12345"
 
-    def _req(self, content_disposition):
+    def _req(self, content_disposition, include_content_type=True):
 
         channel = make_request(
             self.reactor,
@@ -271,8 +271,11 @@ class MediaRepoTests(unittest.HomeserverTestCase):
 
         headers = {
             b"Content-Length": [b"%d" % (len(self.test_image.data))],
-            b"Content-Type": [self.test_image.content_type],
         }
+
+        if include_content_type:
+            headers[b"Content-Type"] = [self.test_image.content_type]
+
         if content_disposition:
             headers[b"Content-Disposition"] = [content_disposition]
 
@@ -285,6 +288,17 @@ class MediaRepoTests(unittest.HomeserverTestCase):
 
         return channel
 
+    def test_handle_missing_content_type(self):
+        channel = self._req(
+            b"inline; filename=out" + self.test_image.extension,
+            include_content_type=False,
+        )
+        headers = channel.headers
+        self.assertEqual(channel.code, 200)
+        self.assertEqual(
+            headers.getRawHeaders(b"Content-Type"), [b"application/octet-stream"]
+        )
+
     def test_disposition_filename_ascii(self):
         """
         If the filename is filename=<ascii> then Synapse will decode it as an