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[ie/youtube] Only cache nsig code on successful decoding (#12750)

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Authored by: seproDev, bashonly

Co-authored-by: bashonly <88596187+bashonly@users.noreply.github.com>
This commit is contained in:
sepro 2025-03-26 00:47:45 +01:00 committed by GitHub
parent a550dfc904
commit ecee97b4fa
No known key found for this signature in database
GPG Key ID: B5690EEEBB952194
1 changed files with 21 additions and 2 deletions
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23
yt_dlp/extractor/youtube/_video.py
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@ -2087,6 +2087,24 @@ class YoutubeIE(YoutubeBaseInfoExtractor):
return ret
return inner
def _load_nsig_code_from_cache(self, player_id):
cache_id = ('nsig code', player_id)
if func_code := self._player_cache.get(cache_id):
return func_code
func_code = self.cache.load('youtube-nsig', player_id, min_ver='2025.03.26')
if func_code:
self._player_cache[cache_id] = func_code
return func_code
def _store_nsig_code_to_cache(self, player_id, func_code):
cache_id = ('nsig code', player_id)
if cache_id not in self._player_cache:
self.cache.store('youtube-nsig', player_id, func_code)
self._player_cache[cache_id] = func_code
def _decrypt_signature(self, s, video_id, player_url):
"""Turn the encrypted s field into a working signature"""
extract_sig = self._cached(
@ -2127,6 +2145,8 @@ class YoutubeIE(YoutubeBaseInfoExtractor):
video_id=video_id, note='Executing signature code').strip()
self.write_debug(f'Decrypted nsig {s} => {ret}')
# Only cache nsig func JS code to disk if successful, and only once
self._store_nsig_code_to_cache(player_id, func_code)
return ret
def _extract_n_function_name(self, jscode, player_url=None):
@ -2200,7 +2220,7 @@ class YoutubeIE(YoutubeBaseInfoExtractor):
def _extract_n_function_code(self, video_id, player_url):
player_id = self._extract_player_info(player_url)
func_code = self.cache.load('youtube-nsig', player_id, min_ver='2025.03.26')
func_code = self._load_nsig_code_from_cache(player_id)
jscode = func_code or self._load_player(video_id, player_url)
jsi = JSInterpreter(jscode)
@ -2212,7 +2232,6 @@ class YoutubeIE(YoutubeBaseInfoExtractor):
# XXX: Workaround for the global array variable and lack of `typeof` implementation
func_code = self._fixup_n_function_code(*jsi.extract_function_code(func_name), jscode)
self.cache.store('youtube-nsig', player_id, func_code)
return jsi, player_id, func_code
def _extract_n_function_from_code(self, jsi, func_code):