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Move the decrypting function to a static method

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This commit is contained in:
Jaime Marquínez Ferrándiz 2013-06-22 13:20:06 +02:00
parent ef75f76f5c
commit b37fbb990b
1 changed files with 13 additions and 9 deletions
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22
youtube_dl/InfoExtractors.py
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@ -379,6 +379,17 @@ def report_rtmp_download(self):
"""Indicate the download will use the RTMP protocol.""" """Indicate the download will use the RTMP protocol."""
self.to_screen(u'RTMP download detected') self.to_screen(u'RTMP download detected')
@staticmethod
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 ExtractorError(u'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 _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)
request = compat_urllib_request.Request('http://video.google.com/timedtext?hl=en&type=list&v=%s' % video_id) request = compat_urllib_request.Request('http://video.google.com/timedtext?hl=en&type=list&v=%s' % video_id)
@ -747,15 +758,8 @@ def _real_extract(self, url):
if 'sig' in url_data: if 'sig' in url_data:
url += '&signature=' + url_data['sig'][0] url += '&signature=' + url_data['sig'][0]
if 's' in url_data: if 's' in url_data:
def k(s): signature = self._decrypt_signature(url_data['s'][0])
"""Decrypt the key the two subkeys must have a length of 43""" url += '&signature=' + signature
(a,b) = s.split('.')
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
key = k(url_data['s'][0])
url += '&signature=' + key
if 'ratebypass' not in url: if 'ratebypass' not in url:
url += '&ratebypass=yes' url += '&ratebypass=yes'
url_map[url_data['itag'][0]] = url url_map[url_data['itag'][0]] = url