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[YouTube] Improve error check for n-sig processing

pull/31213/head
dirkf 2022-08-25 12:14:59 +01:00
parent 66e58dccc2
commit 573b13410e
1 changed files with 12 additions and 6 deletions
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12
youtube_dl/extractor/youtube.py
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@ -1500,7 +1500,8 @@ class YoutubeIE(YoutubeBaseInfoExtractor):
return lambda s: jsi.extract_function_from_code(*func_code)([s])
def _n_descramble(self, n_param, player_url, video_id):
"""Compute the response to YT's "n" parameter challenge
"""Compute the response to YT's "n" parameter challenge,
or None
Args:
n_param -- challenge string that is the value of the
@ -1518,7 +1519,10 @@ class YoutubeIE(YoutubeBaseInfoExtractor):
if player_id not in self._player_cache:
self._player_cache[player_id] = self._extract_n_function(video_id, player_url)
func = self._player_cache[player_id]
self._player_cache[sig_id] = func(n_param)
ret = func(n_param)
if ret.startswith('enhanced_except_'):
raise ExtractorError('Unhandled exception in decode')
self._player_cache[sig_id] = ret
if self._downloader.params.get('verbose', False):
self._downloader.to_screen('[debug] [%s] %s' % (self.IE_NAME, 'Decrypted nsig {0} => {1}'.format(n_param, self._player_cache[sig_id])))
return self._player_cache[sig_id]
@ -1539,7 +1543,9 @@ class YoutubeIE(YoutubeBaseInfoExtractor):
continue
n_param = n_param[-1]
n_response = self._n_descramble(n_param, player_url, video_id)
if n_response:
if n_response is None:
# give up if descrambling failed
break
qs['n'] = [n_response]
fmt['url'] = compat_urlparse.urlunparse(
parsed_fmt_url._replace(query=compat_urllib_parse_urlencode(qs, True)))