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[ie/youtube] Fix n sig extraction for player 3bb1f723 (#11750)

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Closes #11744
Authored by: bashonly
This commit is contained in:
bashonly 2024-12-06 15:35:18 +00:00 committed by GitHub
parent 4c85ccd136
commit a95ee6d880
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GPG key ID: B5690EEEBB952194
2 changed files with 20 additions and 6 deletions
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11
test/test_youtube_signature.py
View file

@ -188,6 +188,10 @@ _NSIG_TESTS = [
'https://www.youtube.com/s/player/b12cc44b/player_ias.vflset/en_US/base.js',
'keLa5R2U00sR9SQK', 'N1OGyujjEwMnLw',
),
(
'https://www.youtube.com/s/player/3bb1f723/player_ias.vflset/en_US/base.js',
'gK15nzVyaXE9RsMP3z', 'ZFFWFLPWx9DEgQ',
),
]
@ -259,8 +263,11 @@ def signature(jscode, sig_input):
def n_sig(jscode, sig_input):
funcname = YoutubeIE(FakeYDL())._extract_n_function_name(jscode)
return JSInterpreter(jscode).call_function(funcname, sig_input)
ie = YoutubeIE(FakeYDL())
funcname = ie._extract_n_function_name(jscode)
jsi = JSInterpreter(jscode)
func = jsi.extract_function_from_code(*ie._fixup_n_function_code(*jsi.extract_function_code(funcname)))
return func([sig_input])
make_sig_test = t_factory(

15
yt_dlp/extractor/youtube.py
View file

@ -3212,6 +3212,7 @@ class YoutubeIE(YoutubeBaseInfoExtractor):
# * a.D&&(b="nn"[+a.D],c=a.get(b))&&(c=narray[idx](c),a.set(b,c),narray.length||nfunc("")
# * a.D&&(PL(a),b=a.j.n||null)&&(b=narray[0](b),a.set("n",b),narray.length||nfunc("")
# * a.D&&(b="nn"[+a.D],vL(a),c=a.j[b]||null)&&(c=narray[idx](c),a.set(b,c),narray.length||nfunc("")
# * J.J="";J.url="";J.Z&&(R="nn"[+J.Z],mW(J),N=J.K[R]||null)&&(N=narray[idx](N),J.set(R,N))}};
funcname, idx = self._search_regex(
r'''(?x)
(?:
@ -3228,7 +3229,7 @@ class YoutubeIE(YoutubeBaseInfoExtractor):
)\)&&\(c=|
\b(?P<var>[a-zA-Z0-9_$]+)=
)(?P<nfunc>[a-zA-Z0-9_$]+)(?:\[(?P<idx>\d+)\])?\([a-zA-Z]\)
(?(var),[a-zA-Z0-9_$]+\.set\("n"\,(?P=var)\),(?P=nfunc)\.length)''',
(?(var),[a-zA-Z0-9_$]+\.set\((?:"n+"|[a-zA-Z0-9_$]+)\,(?P=var)\))''',
jscode, 'n function name', group=('nfunc', 'idx'), default=(None, None))
if not funcname:
self.report_warning(join_nonempty(
@ -3237,7 +3238,7 @@ class YoutubeIE(YoutubeBaseInfoExtractor):
return self._search_regex(
r'''(?xs)
;\s*(?P<name>[a-zA-Z0-9_$]+)\s*=\s*function\([a-zA-Z0-9_$]+\)
\s*\{(?:(?!};).)+?["']enhanced_except_''',
\s*\{(?:(?!};).)+?return\s*(?P<q>["'])[\w-]+_w8_(?P=q)\s*\+\s*[a-zA-Z0-9_$]+''',
jscode, 'Initial JS player n function name', group='name')
elif not idx:
return funcname
@ -3246,6 +3247,11 @@ class YoutubeIE(YoutubeBaseInfoExtractor):
rf'var {re.escape(funcname)}\s*=\s*(\[.+?\])\s*[,;]', jscode,
f'Initial JS player n function list ({funcname}.{idx})')))[int(idx)]
def _fixup_n_function_code(self, argnames, code):
return argnames, re.sub(
rf';\s*if\s*\(\s*typeof\s+[a-zA-Z0-9_$]+\s*===?\s*(["\'])undefined\1\s*\)\s*return\s+{argnames[0]};',
';', code)
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='2024.07.09')
@ -3257,7 +3263,8 @@ class YoutubeIE(YoutubeBaseInfoExtractor):
func_name = self._extract_n_function_name(jscode, player_url=player_url)
func_code = jsi.extract_function_code(func_name)
# XXX: Workaround for the `typeof` gotcha
func_code = self._fixup_n_function_code(*jsi.extract_function_code(func_name))
self.cache.store('youtube-nsig', player_id, func_code)
return jsi, player_id, func_code
@ -3273,7 +3280,7 @@ class YoutubeIE(YoutubeBaseInfoExtractor):
except Exception as e:
raise JSInterpreter.Exception(traceback.format_exc(), cause=e)
if ret.startswith('enhanced_except_'):
if ret.startswith('enhanced_except_') or ret.endswith(f'_w8_{s}'):
raise JSInterpreter.Exception('Signature function returned an exception')
return ret