[utils] `urlhandle_detect_ext`: Use `x-amz-meta-file-type` headers (#13749)

Authored by: bashonly

yt_dlp/utils/_utils.py

@@ -3106,21 +3106,15 @@ def get_compatible_ext(*, vcodecs, acodecs, vexts, aexts, preferences=None):
 def urlhandle_detect_ext(url_handle, default=NO_DEFAULT):
     getheader = url_handle.headers.get
 
-    cd = getheader('Content-Disposition')
-    if cd:
-        m = re.match(r'attachment;\s*filename="(?P<filename>[^"]+)"', cd)
-        if m:
-            e = determine_ext(m.group('filename'), default_ext=None)
-            if e:
-                return e
-
-    meta_ext = getheader('x-amz-meta-name')
-    if meta_ext:
-        e = meta_ext.rpartition('.')[2]
-        if e:
-            return e
+    if cd := getheader('Content-Disposition'):
+        if m := re.match(r'attachment;\s*filename="(?P<filename>[^"]+)"', cd):
+            if ext := determine_ext(m.group('filename'), default_ext=None):
+                return ext
 
-    return mimetype2ext(getheader('Content-Type'), default=default)
+    return (
+        determine_ext(getheader('x-amz-meta-name'), default_ext=None)
+        or getheader('x-amz-meta-file-type')
+        or mimetype2ext(getheader('Content-Type'), default=default))
 
 
 def encode_data_uri(data, mime_type):