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Code Issues Releases Wiki Activity

[youtube] improved decrypt_signature, closes #1060

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Anton Novosyolov 2013-07-17 10:41:43 +04:00
parent ec00e1d8a0
commit fe6fad1242
1 changed files with 17 additions and 18 deletions
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35
youtube_dl/extractor/youtube.py
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@ -179,25 +179,24 @@ class YoutubeIE(InfoExtractor):
def _decrypt_signature(self, s): def _decrypt_signature(self, s):
"""Turn the encrypted s field into a working signature""" """Turn the encrypted s field into a working signature"""
if len(s) == 88: def voodoo(a, b):
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] c = a[0];
elif len(s) == 87: a[0] = a[b % len(a)];
return s[62] + s[82:62:-1] + s[83] + s[61:52:-1] + s[0] + s[51:2:-1] a[b] = c;
elif len(s) == 86: return a;
return s[2:63] + s[82] + s[64:82] + s[63]
elif len(s) == 85:
return s[76] + s[82:76:-1] + s[83] + s[75:60:-1] + s[0] + s[59:50:-1] + s[1] + s[49:2:-1]
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: s = list(s)
raise ExtractorError(u'Unable to decrypt signature, key length %d not supported; retrying might work' % (len(s))) s = s[2:len(s)];
s = s[::-1];
s = s[3:len(s)];
s = voodoo(s, 9);
s = s[3:len(s)];
s = voodoo(s, 43);
s = s[3:len(s)];
s = s[::-1];
s = voodoo(s, 23);
s = "".join(s);
return s;
def _get_available_subtitles(self, video_id): def _get_available_subtitles(self, video_id):
self.report_video_subtitles_download(video_id) self.report_video_subtitles_download(video_id)