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YouTube: fix #203, using decryption algorithm from youtube-dl

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This commit is contained in:
Mort Yao 2013-06-27 23:38:23 +08:00
parent d2128789e5
commit da66e127b8
1 changed files with 19 additions and 11 deletions
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30
src/you_get/downloader/youtube.py
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@ -78,16 +78,24 @@ def parse_video_info(raw_info):
for item in
raw_info.split('&')])
# Imported from youtube-dl
def _decrypt_signature(s):
"""Decrypt the key the two subkeys must have a length of 43"""
(a, b) = s.split('.')
if len(a) != 43 or len(b) != 43:
raise Exception('Unable to decrypt signature, subkeys lengths not valid')
b = ''.join([b[:8], a[0], b[9:18], b[-4], b[19:39], b[18]])[0:40]
a = a[-40:]
s_dec = '.'.join((a, b))[::-1]
return s_dec
# Signature decryption algorithm, reused code from youtube-dl
def decrypt_signature(s):
if 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[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[52] + s[81:55:-1] + s[2] + s[54:52:-1] + s[82] + s[51:36:-1] + s[55] + s[35:2:-1] + s[36]
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]
else:
raise Exception(u'Unable to decrypt signature, key length %d not supported; retrying might work' % (len(s)))
def youtube_download_by_id(id, title = None, output_dir = '.', merge = True, info_only = False):
@ -129,7 +137,7 @@ def youtube_download_by_id(id, title = None, output_dir = '.', merge = True, inf
url = r1(r'url=([^\\]+)', fmt)
url = unicodize(url)
url = parse.unquote(url)
sig = r1(r'sig=([^\\]+)', fmt) or _decrypt_signature(r1(r's=([^\\]+)', fmt))
sig = r1(r'sig=([^\\]+)', fmt) or decrypt_signature(r1(r's=([^\\]+)', fmt))
url = url + '&signature=' + sig
break
try: