More robust handling of the Content-Type header for thumbnail generation (#9788)

Signed-off-by: Sergey Shpikin <rkfg@rkfg.me>

1 files changed, 3 insertions, 0 deletions

diff --git a/synapse/rest/media/v1/media_repository.py b/synapse/rest/media/v1/media_repository.py

index 87e3645ddc..e8a875b900 100644
--- a/synapse/rest/media/v1/media_repository.py
+++ b/synapse/rest/media/v1/media_repository.py
@@ -467,6 +467,9 @@ class MediaRepository:
         return media_info
 
     def _get_thumbnail_requirements(self, media_type):
+        scpos = media_type.find(";")
+        if scpos > 0:
+            media_type = media_type[:scpos]
         return self.thumbnail_requirements.get(media_type, ())
 
     def _generate_thumbnail(