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[ie/youtube] Fix n function name extraction for player 20dfca59 (#10611)

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Closes #10608
Authored by: bashonly
This commit is contained in:
bashonly 2024-07-31 16:19:30 -05:00 committed by GitHub
parent 7e3e4779ad
commit 011b4a04db
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2 changed files with 24 additions and 6 deletions
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4
test/test_youtube_signature.py
View file

@ -175,6 +175,10 @@
'https://www.youtube.com/s/player/3400486c/player_ias.vflset/en_US/base.js',
'lL46g3XifCKUZn1Xfw', 'z767lhet6V2Skl',
),
(
'https://www.youtube.com/s/player/20dfca59/player_ias.vflset/en_US/base.js',
'-fLCxedkAk4LUTK2', 'O8kfRq1y1eyHGw',
),
]

26
yt_dlp/extractor/youtube.py
View file

@ -3174,18 +3174,32 @@ def _decrypt_nsig(self, s, video_id, player_url):
return ret
def _extract_n_function_name(self, jscode):
# Examples (with placeholders nfunc, narray, idx):
# * .get("n"))&&(b=nfunc(b)
# * .get("n"))&&(b=narray[idx](b)
# * b=String.fromCharCode(110),c=a.get(b))&&c=narray[idx](c)
# * 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("")
funcname, idx = self._search_regex(
r'''(?x)
(?:
\.get\("n"\)\)&&\(b=|
(?:
b=String\.fromCharCode\(110\)|
([a-zA-Z0-9$.]+)&&\(b="nn"\[\+\1\]
),c=a\.get\(b\)\)&&\(c=
)
(?P<nfunc>[a-zA-Z0-9$]+)(?:\[(?P<idx>\d+)\])?\([a-zA-Z0-9]\)''',
jscode, 'Initial JS player n function name', group=('nfunc', 'idx'))
if not idx:
(?P<str_idx>[a-zA-Z0-9_$.]+)&&\(b="nn"\[\+(?P=str_idx)\]
),c=a\.get\(b\)\)&&\(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)''',
jscode, 'n function name', group=('nfunc', 'idx'), default=(None, None))
if not funcname:
self.report_warning('Falling back to generic n function search')
return self._search_regex(
r'''(?xs)
;\s*(?P<name>[a-zA-Z0-9_$]+)\s*=\s*function\([a-zA-Z0-9_$]+\)
\s*\{(?:(?!};).)+?["']enhanced_except_''',
jscode, 'Initial JS player n function name', group='name')
elif not idx:
return funcname
return json.loads(js_to_json(self._search_regex(