abstract facebook _extract_metadata method out from inside '_extract_from_url'

yt_dlp/extractor/facebook.py

@@ -478,11 +478,7 @@ class FacebookIE(InfoExtractor):
             self.report_warning(f'unable to log in: {err}')
             return
         
-    def _extract_from_url(self, url, video_id):
-        webpage = self._download_webpage(
-            url.replace('://m.facebook.com/', '://www.facebook.com/'), video_id)
-
-        def extract_metadata(webpage):
+    def _extract_metadata(self, webpage, video_id):
         post_data = [self._parse_json(j, video_id, fatal=False) for j in re.findall(
             r'data-sjs>({.*?ScheduledServerJS.*?})</script>', webpage)]
         post = traverse_obj(post_data, (
@@ -543,6 +539,10 @@ class FacebookIE(InfoExtractor):
                                     or (description or '').replace('\n', ' ') or f'Facebook video #{video_id}')
         return merge_dicts(info_json_ld, info_dict)
 
+    def _extract_from_url(self, url, video_id):
+        webpage = self._download_webpage(
+            url.replace('://m.facebook.com/', '://www.facebook.com/'), video_id)
+
         video_data = None
 
         def extract_video_data(instances):
@@ -753,7 +753,7 @@ class FacebookIE(InfoExtractor):
                     return self.playlist_result(entries, video_id)
 
                 video_info = entries[0] if entries else {'id': video_id}
-                webpage_info = extract_metadata(webpage)
+                webpage_info = self._extract_metadata(webpage, video_id)
                 # honor precise duration in video info
                 if video_info.get('duration'):
                     webpage_info['duration'] = video_info['duration']
@@ -885,7 +885,7 @@ class FacebookIE(InfoExtractor):
             'subtitles': subtitles,
         }
         process_formats(info_dict)
-        info_dict.update(extract_metadata(webpage))
+        info_dict.update(self._extract_metadata(webpage, video_id))
 
         return info_dict