[telegram] Add extractor (#2922)

Closes #2910

Authored by: hatienl0i261299

yt_dlp/extractor/telegram.py

@@ -0,0 +1,37 @@
+from .common import InfoExtractor
+
+
+class TelegramEmbedIE(InfoExtractor):
+    IE_NAME = 'telegram:embed'
+    _VALID_URL = r'https?://t\.me/(?P<channel_name>[^/]+)/(?P<id>\d+)'
+    _TESTS = [{
+        'url': 'https://t.me/europa_press/613',
+        'info_dict': {
+            'id': '613',
+            'ext': 'mp4',
+            'title': 'Europa Press',
+            'description': '6ce2d7e8d56eda16d80607b23db7b252',
+            'thumbnail': r're:^https?:\/\/cdn.*?telesco\.pe\/file\/\w+',
+        },
+    }]
+
+    def _real_extract(self, url):
+        video_id = self._match_id(url)
+        webpage = self._download_webpage(url, video_id)
+        webpage_embed = self._download_webpage(f'{url}?embed=1', video_id)
+
+        formats = [{
+            'url': self._proto_relative_url(self._search_regex(
+                '<video[^>]+src="([^"]+)"', webpage_embed, 'source')),
+            'ext': 'mp4',
+        }]
+        self._sort_formats(formats)
+
+        return {
+            'id': video_id,
+            'title': self._html_search_meta(['og:title', 'twitter:title'], webpage, fatal=True),
+            'description': self._html_search_meta(['og:description', 'twitter:description'], webpage, fatal=True),
+            'thumbnail': self._search_regex(r'tgme_widget_message_video_thumb"[^>]+background-image:url\(\'([^\']+)\'\)',
+                                            webpage_embed, 'thumbnail'),
+            'formats': formats,
+        }