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youtube: Support for a silly protection

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Not sure I can even call that DRM.

closes #1277
This commit is contained in:
Laurent Bachelier 2013-07-21 01:13:40 +02:00
commit aa8f0999a0
1 changed files with 33 additions and 1 deletions
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34
modules/youtube/pages.py
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@ -97,6 +97,33 @@ class VideoPage(BaseYoutubePage):
45: 'webm',
}
def _decrypt_signature(self, s):
"""Turn the encrypted s field into a working signature"""
if len(s) == 92:
return s[25] + s[3:25] + s[0] + s[26:42] + s[79] + s[43:79] + s[91] + s[80:83]
elif len(s) == 90:
return s[25] + s[3:25] + s[2] + s[26:40] + s[77] + s[41:77] + s[89] + s[78:81]
elif len(s) == 88:
return s[48] + s[81:67:-1] + s[82] + s[66:62:-1] + s[85] + s[61:48:-1] + s[67] + s[47:12:-1] + s[3] + s[11:3:-1] + s[2] + s[12]
elif len(s) == 87:
return s[62] + s[82:62:-1] + s[83] + s[61:52:-1] + s[0] + s[51:2:-1]
elif len(s) == 86:
return s[2:63] + s[82] + s[64:82] + s[63]
elif len(s) == 85:
return s[2:8] + s[0] + s[9:21] + s[65] + s[22:65] + s[84] + s[66:82] + s[21]
elif len(s) == 84:
return s[83:36:-1] + s[2] + s[35:26:-1] + s[3] + s[25:3:-1] + s[26]
elif len(s) == 83:
return s[6] + s[3:6] + s[33] + s[7:24] + s[0] + s[25:33] + s[53] + s[34:53] + s[24] + s[54:]
elif len(s) == 82:
return s[36] + s[79:67:-1] + s[81] + s[66:40:-1] + s[33] + s[39:36:-1] + s[40] + s[35] + s[0] + s[67] + s[32:0:-1] + s[34]
elif len(s) == 81:
return s[6] + s[3:6] + s[33] + s[7:24] + s[0] + s[25:33] + s[2] + s[34:53] + s[24] + s[54:81]
else:
raise BrokenPageError(u'Unable to decrypt signature, key length %d not supported; retrying might work' % (len(s)))
def get_video_url(self, format=38):
formats = {}
for script in self.parser.select(self.document.getroot(), 'script'):
@ -114,7 +141,12 @@ class VideoPage(BaseYoutubePage):
for part in a['args']['url_encoded_fmt_stream_map'].split(','):
args = dict(parse_qsl(part))
formats[int(args['itag'])] = args['url'] + '&signature=' + args['sig']
url = args['url']
if 'sig' in args:
signature = args['sig']
elif 's' in args:
signature = self._decrypt_signature(args['s'])
formats[int(args['itag'])] = args['url'] + '&signature=' + signature
break