[facebook] add support for watchparty pages(closes #27507)

youtube_dl/extractor/facebook.py

@@ -1,6 +1,7 @@
 # coding: utf-8
 from __future__ import unicode_literals
 
+import json
 import re
 import socket
 
@@ -8,6 +9,7 @@ from .common import InfoExtractor
 from ..compat import (
     compat_etree_fromstring,
     compat_http_client,
+    compat_str,
     compat_urllib_error,
     compat_urllib_parse_unquote,
     compat_urllib_parse_unquote_plus,
@@ -47,7 +49,8 @@ class FacebookIE(InfoExtractor):
                             )\?(?:.*?)(?:v|video_id|story_fbid)=|
                             [^/]+/videos/(?:[^/]+/)?|
                             [^/]+/posts/|
-                            groups/[^/]+/permalink/
+                            groups/[^/]+/permalink/|
+                            watchparty/
                         )|
                     facebook:
                 )
@@ -280,8 +283,18 @@ class FacebookIE(InfoExtractor):
         # data.video.creation_story.attachments[].media
         'url': 'https://www.facebook.com/watch/live/?v=1823658634322275',
         'only_matching': True,
+    }, {
+        'url': 'https://www.facebook.com/watchparty/211641140192478',
+        'info_dict': {
+            'id': '211641140192478',
+        },
+        'playlist_count': 1,
+        'skip': 'Requires logging in',
     }]
     _SUPPORTED_PAGLETS_REGEX = r'(?:pagelet_group_mall|permalink_video_pagelet|hyperfeed_story_id_[0-9a-f]+)'
+    _api_config = {
+        'graphURI': '/api/graphql/'
+    }
 
     @staticmethod
     def _extract_urls(webpage):
@@ -405,6 +418,17 @@ class FacebookIE(InfoExtractor):
 
             self._sort_formats(formats)
 
+        def extract_relay_data(_filter):
+            return self._parse_json(self._search_regex(
+                r'handleWithCustomApplyEach\([^,]+,\s*({.*?%s.*?})\);' % _filter,
+                webpage, 'replay data', default='{}'), video_id, fatal=False) or {}
+
+        def extract_relay_prefetched_data(_filter):
+            replay_data = extract_relay_data(_filter)
+            for require in (replay_data.get('require') or []):
+                if require[0] == 'RelayPrefetchedStreamCache':
+                    return try_get(require, lambda x: x[3][1]['__bbox']['result']['data'], dict) or {}
+
         if not video_data:
             server_js_data = self._parse_json(self._search_regex([
                 r'bigPipe\.onPageletArrive\(({.+?})\)\s*;\s*}\s*\)\s*,\s*["\']onPageletArrive\s+' + self._SUPPORTED_PAGLETS_REGEX,
@@ -413,11 +437,9 @@ class FacebookIE(InfoExtractor):
             video_data = extract_from_jsmods_instances(server_js_data)
 
         if not video_data:
-            graphql_data = self._parse_json(self._search_regex(
-                r'handleWithCustomApplyEach\([^,]+,\s*({.*?"(?:dash_manifest|playable_url(?:_quality_hd)?)"\s*:\s*"[^"]+".*?})\);',
-                webpage, 'graphql data', default='{}'), video_id, fatal=False) or {}
-            for require in (graphql_data.get('require') or []):
-                if require[0] == 'RelayPrefetchedStreamCache':
+            data = extract_relay_prefetched_data(
+                r'"(?:dash_manifest|playable_url(?:_quality_hd)?)"\s*:\s*"[^"]+"')
+            if data:
                 entries = []
 
                 def parse_graphql_video(video):
@@ -459,8 +481,6 @@ class FacebookIE(InfoExtractor):
                     if media.get('__typename') == 'Video':
                         return parse_graphql_video(media)
 
-                    data = try_get(require, lambda x: x[3][1]['__bbox']['result']['data'], dict) or {}
-
                 nodes = data.get('nodes') or []
                 node = data.get('node') or {}
                 if not nodes and node:
@@ -504,6 +524,43 @@ class FacebookIE(InfoExtractor):
             elif '>You must log in to continue' in webpage:
                 self.raise_login_required()
 
+        if not video_data and '/watchparty/' in url:
+            post_data = {
+                'doc_id': 3731964053542869,
+                'variables': json.dumps({
+                    'livingRoomID': video_id,
+                }),
+            }
+
+            prefetched_data = extract_relay_prefetched_data(r'"login_data"\s*:\s*{')
+            if prefetched_data:
+                lsd = try_get(prefetched_data, lambda x: x['login_data']['lsd'], dict)
+                if lsd:
+                    post_data[lsd['name']] = lsd['value']
+
+            relay_data = extract_relay_data(r'\[\s*"RelayAPIConfigDefaults"\s*,')
+            for define in (relay_data.get('define') or []):
+                if define[0] == 'RelayAPIConfigDefaults':
+                    self._api_config = define[2]
+
+            living_room = self._download_json(
+                urljoin(url, self._api_config['graphURI']), video_id,
+                data=urlencode_postdata(post_data))['data']['living_room']
+
+            entries = []
+            for edge in (try_get(living_room, lambda x: x['recap']['watched_content']['edges']) or []):
+                video = try_get(edge, lambda x: x['node']['video']) or {}
+                v_id = video.get('id')
+                if not v_id:
+                    continue
+                v_id = compat_str(v_id)
+                entries.append(self.url_result(
+                    self._VIDEO_PAGE_TEMPLATE % v_id,
+                    self.ie_key(), v_id, video.get('name')))
+
+            return self.playlist_result(entries, video_id)
+
+        if not video_data:
             # Video info not in first request, do a secondary request using
             # tahoe player specific URL
             tahoe_data = self._download_webpage(