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YouTube: decrypt ciphered signature, temporarily fix #203

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This commit is contained in:
Mort Yao 2013-06-27 00:50:25 +08:00
parent 8e2165af47
commit 6c1be0f936
1 changed files with 13 additions and 2 deletions
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15
src/you_get/downloader/youtube.py
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@ -78,13 +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
def youtube_download_by_id(id, title = None, output_dir = '.', merge = True, info_only = False):
raw_info = request.urlopen('http://www.youtube.com/get_video_info?video_id=%s' % id).read().decode('utf-8')
video_info = parse_video_info(raw_info)
if video_info['status'] == 'ok': # use get_video_info data
if video_info['status'] == 'ok' and not video_info['use_cipher_signature'] == 'True': # use get_video_info data
title = parse.unquote(video_info['title'].replace('+', ' '))
@ -118,7 +129,7 @@ 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)
sig = r1(r'sig=([^\\]+)', fmt) or _decrypt_signature(r1(r's=([^\\]+)', fmt))
url = url + '&signature=' + sig
break
try: