From ff7b57a0657fb467c10bb74c6b34f1e29dcde87f Mon Sep 17 00:00:00 2001
From: Mort Yao <mort.yao@gmail.com>
Date: Thu, 7 Aug 2014 21:21:35 +0200
Subject: [PATCH] Youku: fix #383, using the new ep generation algorithm

---
 src/you_get/extractors/youku.py | 53 +++++++++++++++++++++++++++++++--
 1 file changed, 51 insertions(+), 2 deletions(-)

diff --git a/src/you_get/extractors/youku.py b/src/you_get/extractors/youku.py
index 0f2d593..9b2c402 100644
--- a/src/you_get/extractors/youku.py
+++ b/src/you_get/extractors/youku.py
@@ -4,6 +4,9 @@
 from ..common import *
 from ..extractor import VideoExtractor
 
+import base64
+import time
+
 class Youku(VideoExtractor):
     name = "优酷 (Youku)"
 
@@ -17,6 +20,36 @@ class Youku(VideoExtractor):
         {'id': '3gphd', 'container': '3gp', 'video_profile': '高清（3GP）'},
     ]
 
+    def generate_ep(vid, ep):
+        f_code_1 = 'becaf9be'
+        f_code_2 = 'bf7e5f01'
+
+        def trans_e(a, c):
+            f = h = 0
+            b = list(range(256))
+            result = ''
+            while h < 256:
+                f = (f + b[h] + ord(a[h % len(a)])) % 256
+                b[h], b[f] = b[f], b[h]
+                h += 1
+            q = f = h = 0
+            while q < len(c):
+                h = (h + 1) % 256
+                f = (f + b[h]) % 256
+                b[h], b[f] = b[f], b[h]
+                if isinstance(c[q], int):
+                    result += chr(c[q] ^ b[(b[h] + b[f]) % 256])
+                else:
+                    result += chr(ord(c[q]) ^ b[(b[h] + b[f]) % 256])
+                q += 1
+
+            return result
+
+        e_code = trans_e(f_code_1, base64.b64decode(ep))
+        sid, token = e_code.split('_')
+        new_ep = trans_e(f_code_2, '%s_%s_%s' % (sid, vid, token))
+        return base64.b64encode(bytes(new_ep, 'latin')), sid, token
+
     def parse_m3u8(m3u8):
         return re.findall(r'(http://[^?]+)\?ts_start=0', m3u8)
 
@@ -57,7 +90,7 @@ class Youku(VideoExtractor):
                 self.download_playlist_by_url(self.url, **kwargs)
                 exit(0)
 
-        meta = json.loads(get_html('http://v.youku.com/player/getPlayList/VideoIDS/%s' % self.vid))
+        meta = json.loads(get_html('http://v.youku.com/player/getPlayList/VideoIDS/%s/Pf/4/ctype/12/ev/1' % self.vid))
         if not meta['data']:
             log.wtf('[Failed] Video not found.')
         metadata0 = meta['data'][0]
@@ -72,6 +105,9 @@ class Youku(VideoExtractor):
 
         self.title = metadata0['title']
 
+        self.ep = metadata0['ep']
+        self.ip = metadata0['ip']
+
         if 'dvd' in metadata0 and 'audiolang' in metadata0['dvd']:
             self.audiolang = metadata0['dvd']['audiolang']
             for i in self.audiolang:
@@ -102,7 +138,20 @@ class Youku(VideoExtractor):
             # Extract stream with the best quality
             stream_id = self.streams_sorted[0]['id']
 
-        m3u8_url = "http://v.youku.com/player/getM3U8/vid/{vid}/type/{stream_id}/video.m3u8".format(vid=self.vid, stream_id=stream_id)
+        new_ep, sid, token = __class__.generate_ep(self.vid, self.ep)
+        m3u8_query = parse.urlencode(dict(
+            ctype=12,
+            ep=new_ep,
+            ev=1,
+            keyframe=1,
+            oip=self.ip,
+            sid=sid,
+            token=token,
+            ts=int(time.time()),
+            type=stream_id,
+            vid=self.vid,
+        ))
+        m3u8_url = 'http://pl.youku.com/playlist/m3u8?' + m3u8_query
 
         if not kwargs['info_only']:
             if self.password_protected:
-- 
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