Fix DLNA local file playback for Sony TA-AN1000 by returning content type for HEAD requests (home-assistant#165807)

Author: sanpoChew

homeassistant/components/media_source/local_source.py

@@ -314,15 +314,17 @@ async def _validate_media_path(self, source_dir_id: str, location: str) -> Path:
 
     async def head(
         self, request: web.Request, source_dir_id: str, location: str
-    ) -> None:
+    ) -> web.Response:
         """Handle a HEAD request.
 
         This is sent by some DLNA renderers, like Samsung ones, prior to sending
         the GET request.
 
         Check whether the location exists or not.
         """
-        await self._validate_media_path(source_dir_id, location)
+        media_path = await self._validate_media_path(source_dir_id, location)
+        mime_type, _ = mimetypes.guess_type(str(media_path))
+        return web.Response(content_type=mime_type)
 
     async def get(
         self, request: web.Request, source_dir_id: str, location: str

tests/components/media_source/test_local_source.py

@@ -132,10 +132,15 @@ async def test_media_view(
     # Fetch available media
     resp = await client.head("/media/local/test.mp3")
     assert resp.status == HTTPStatus.OK
+    assert resp.content_type == "audio/mpeg"
 
     resp = await client.get("/media/local/test.mp3")
     assert resp.status == HTTPStatus.OK
 
+    resp = await client.head("/media/local/Epic Sax Guy 10 Hours.mp4")
+    assert resp.status == HTTPStatus.OK
+    assert resp.content_type == "video/mp4"
+
     resp = await client.get("/media/local/Epic Sax Guy 10 Hours.mp4")
     assert resp.status == HTTPStatus.OK