mirror of
https://github.com/ytdl-org/youtube-dl.git
synced 2024-12-22 07:56:49 +00:00
Implement n-param descrambling using JSInterp
Fixes #29326, closes #29790, closes #30004, closes #30024, closes #30052, closes #30088, closes #30097, closes #30102, closes #30109, closes #30119, closes #30125, closes #30128, closes #30162, closes #30173, closes #30186, closes #30192, closes #30221, closes #30239, closes #30539, closes #30552.
This commit is contained in:
df
dirkf
parent
6ca7b77696
commit
af9e72507e
@ -1254,6 +1254,17 @@ class YoutubeIE(YoutubeBaseInfoExtractor):
|
||||
raise ExtractorError('Cannot identify player %r' % player_url)
|
||||
return id_m.group('id')
|
||||
|
||||
def _get_player_code(self, video_id, player_url, player_id=None):
|
||||
if not player_id:
|
||||
player_id = self._extract_player_info(player_url)
|
||||
|
||||
if player_id not in self._code_cache:
|
||||
self._code_cache[player_id] = self._download_webpage(
|
||||
player_url, video_id,
|
||||
note='Downloading player ' + player_id,
|
||||
errnote='Download of %s failed' % player_url)
|
||||
return self._code_cache[player_id]
|
||||
|
||||
def _extract_signature_function(self, video_id, player_url, example_sig):
|
||||
player_id = self._extract_player_info(player_url)
|
||||
|
||||
@ -1266,12 +1277,7 @@ class YoutubeIE(YoutubeBaseInfoExtractor):
|
||||
if cache_spec is not None:
|
||||
return lambda s: ''.join(s[i] for i in cache_spec)
|
||||
|
||||
if player_id not in self._code_cache:
|
||||
self._code_cache[player_id] = self._download_webpage(
|
||||
player_url, video_id,
|
||||
note='Downloading player ' + player_id,
|
||||
errnote='Download of %s failed' % player_url)
|
||||
code = self._code_cache[player_id]
|
||||
code = self._get_player_code(video_id, player_url, player_id)
|
||||
res = self._parse_sig_js(code)
|
||||
|
||||
test_string = ''.join(map(compat_chr, range(len(example_sig))))
|
||||
@ -1350,11 +1356,6 @@ class YoutubeIE(YoutubeBaseInfoExtractor):
|
||||
if player_url is None:
|
||||
raise ExtractorError('Cannot decrypt signature without player_url')
|
||||
|
||||
if player_url.startswith('//'):
|
||||
player_url = 'https:' + player_url
|
||||
elif not re.match(r'https?://', player_url):
|
||||
player_url = compat_urlparse.urljoin(
|
||||
'https://www.youtube.com', player_url)
|
||||
try:
|
||||
player_id = (player_url, self._signature_cache_id(s))
|
||||
if player_id not in self._player_cache:
|
||||
@ -1371,6 +1372,88 @@ class YoutubeIE(YoutubeBaseInfoExtractor):
|
||||
raise ExtractorError(
|
||||
'Signature extraction failed: ' + tb, cause=e)
|
||||
|
||||
def _extract_player_url(self, webpage):
|
||||
player_url = self._search_regex(
|
||||
r'"(?:PLAYER_JS_URL|jsUrl)"\s*:\s*"([^"]+)"',
|
||||
webpage or '', 'player URL', fatal=False)
|
||||
if not player_url:
|
||||
return
|
||||
if player_url.startswith('//'):
|
||||
player_url = 'https:' + player_url
|
||||
elif not re.match(r'https?://', player_url):
|
||||
player_url = compat_urlparse.urljoin(
|
||||
'https://www.youtube.com', player_url)
|
||||
return player_url
|
||||
|
||||
# from yt-dlp
|
||||
# See also:
|
||||
# 1. https://github.com/ytdl-org/youtube-dl/issues/29326#issuecomment-894619419
|
||||
# 2. https://code.videolan.org/videolan/vlc/-/blob/4fb284e5af69aa9ac2100ccbdd3b88debec9987f/share/lua/playlist/youtube.lua#L116
|
||||
# 3. https://github.com/ytdl-org/youtube-dl/issues/30097#issuecomment-950157377
|
||||
def _extract_n_function_name(self, jscode):
|
||||
return self._search_regex(
|
||||
(r'\.get\("n"\)\)&&\(b=(?P<nfunc>[a-zA-Z0-9$]{3})\([a-zA-Z0-9]\)',),
|
||||
jscode, 'Initial JS player n function name', group='nfunc')
|
||||
|
||||
def _extract_n_function(self, video_id, player_url):
|
||||
player_id = self._extract_player_info(player_url)
|
||||
func_code = self._downloader.cache.load('youtube-nsig', player_id)
|
||||
|
||||
if func_code:
|
||||
jsi = JSInterpreter(func_code)
|
||||
else:
|
||||
player_id = self._extract_player_info(player_url)
|
||||
jscode = self._get_player_code(video_id, player_url, player_id)
|
||||
funcname = self._extract_n_function_name(jscode)
|
||||
jsi = JSInterpreter(jscode)
|
||||
func_code = jsi.extract_function_code(funcname)
|
||||
self._downloader.cache.store('youtube-nsig', player_id, func_code)
|
||||
|
||||
if self._downloader.params.get('youtube_print_sig_code'):
|
||||
self.to_screen('Extracted nsig function from {0}:\n{1}\n'.format(player_id, func_code[1]))
|
||||
|
||||
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
|
||||
|
||||
Args:
|
||||
n_param -- challenge string that is the value of the
|
||||
URL's "n" query parameter
|
||||
player_url -- URL of YT player JS
|
||||
video_id
|
||||
"""
|
||||
|
||||
sig_id = ('nsig_value', n_param)
|
||||
if sig_id in self._player_cache:
|
||||
return self._player_cache[sig_id]
|
||||
|
||||
try:
|
||||
player_id = ('nsig', player_url)
|
||||
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)
|
||||
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]
|
||||
except Exception as e:
|
||||
raise ExtractorError(traceback.format_exc(), cause=e, video_id=video_id)
|
||||
|
||||
def _unthrottle_format_urls(self, video_id, player_url, formats):
|
||||
for fmt in formats:
|
||||
parsed_fmt_url = compat_urlparse.urlparse(fmt['url'])
|
||||
qs = compat_urlparse.parse_qs(parsed_fmt_url.query)
|
||||
n_param = qs.get('n')
|
||||
if not n_param:
|
||||
continue
|
||||
n_param = n_param[-1]
|
||||
n_response = self._n_descramble(n_param, player_url, video_id)
|
||||
if n_response:
|
||||
qs['n'] = [n_response]
|
||||
fmt['url'] = compat_urlparse.urlunparse(
|
||||
parsed_fmt_url._replace(query=compat_urllib_parse_urlencode(qs, True)))
|
||||
|
||||
def _mark_watched(self, video_id, player_response):
|
||||
playback_url = url_or_none(try_get(
|
||||
player_response,
|
||||
@ -1632,11 +1715,7 @@ class YoutubeIE(YoutubeBaseInfoExtractor):
|
||||
if not (sc and fmt_url and encrypted_sig):
|
||||
continue
|
||||
if not player_url:
|
||||
if not webpage:
|
||||
continue
|
||||
player_url = self._search_regex(
|
||||
r'"(?:PLAYER_JS_URL|jsUrl)"\s*:\s*"([^"]+)"',
|
||||
webpage, 'player URL', fatal=False)
|
||||
player_url = self._extract_player_url(webpage)
|
||||
if not player_url:
|
||||
continue
|
||||
signature = self._decrypt_signature(sc['s'][0], video_id, player_url)
|
||||
@ -1782,6 +1861,10 @@ class YoutubeIE(YoutubeBaseInfoExtractor):
|
||||
is_live = video_details.get('isLive')
|
||||
owner_profile_url = microformat.get('ownerProfileUrl')
|
||||
|
||||
if not player_url:
|
||||
player_url = self._extract_player_url(webpage)
|
||||
self._unthrottle_format_urls(video_id, player_url, formats)
|
||||
|
||||
info = {
|
||||
'id': video_id,
|
||||
'title': self._live_title(video_title) if is_live else video_title,
|
||||
|
||||
Loading…
Reference in New Issue
Block a user