[ceskatelevize] Fetch iframe from nextJS data (#1904)

Closes #1899
Authored by: mkubecek

yt_dlp/extractor/ceskatelevize.py

@@ -12,8 +12,7 @@ from ..utils import (
     ExtractorError,
     float_or_none,
     sanitized_Request,
-    unescapeHTML,
-    update_url_query,
+    traverse_obj,
     urlencode_postdata,
     USER_AGENTS,
 )
@@ -99,11 +98,13 @@ class CeskaTelevizeIE(InfoExtractor):
             playlist_description = playlist_description.replace('\xa0', ' ')
 
         if parsed_url.path.startswith('/porady/'):
-            refer_url = update_url_query(unescapeHTML(self._search_regex(
-                (r'<span[^>]*\bdata-url=(["\'])(?P<url>(?:(?!\1).)+)\1',
-                 r'<iframe[^>]+\bsrc=(["\'])(?P<url>(?:https?:)?//(?:www\.)?ceskatelevize\.cz/ivysilani/embed/iFramePlayer\.php.*?)\1'),
-                webpage, 'iframe player url', group='url')), query={'autoStart': 'true'})
-            webpage = self._download_webpage(refer_url, playlist_id)
+            next_data = self._search_nextjs_data(webpage, playlist_id)
+            idec = traverse_obj(next_data, ('props', 'pageProps', 'data', ('show', 'mediaMeta'), 'idec'), get_all=False)
+            if not idec:
+                raise ExtractorError('Failed to find IDEC id')
+            iframe_hash = self._download_webpage('https://www.ceskatelevize.cz/v-api/iframe-hash/', playlist_id)
+            webpage = self._download_webpage('https://www.ceskatelevize.cz/ivysilani/embed/iFramePlayer.php', playlist_id,
+                                             query={'hash': iframe_hash, 'origin': 'iVysilani', 'autoStart': 'true', 'IDEC': idec})
 
         NOT_AVAILABLE_STRING = 'This content is not available at your territory due to limited copyright.'
         if '%s</p>' % NOT_AVAILABLE_STRING in webpage: