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