解析youku视频地址的python脚本

几个月前写的东西，偶然翻出来发现还能用，就贴出来吧。非专业python程序员，代码比较乱 :-(

'''
Created on 2013-3-6

@author: nightxie
'''

import sys
import urllib.request
import urllib.parse
import json

def GetKeyString(seed):
    base_string = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ/\\:._-1234567890';
    target_string = '';
    while len(base_string) != 0 :
        seed = (seed * 211 + 30031) % 65536;
        index = (seed / 65536 * len(base_string));
        target_string += base_string[int(index)];
        base_string = base_string[:int(index)] + base_string[int(index)+1:];
    return target_string;

def GetFildId(daye_str, seed):

    new_list = daye_str.split('*');
    target_string = '';
    base_string = GetKeyString(seed);
    length = len(new_list);
    i = 0;
    while i < length - 1:
        index = int(new_list[i]);
        target_string += base_string[index];
        i += 1;
    return target_string;

def GetFlvPath(videoids, flv_type):
    url = 'http://v.youku.com/player/getPlayList/VideoIDS/' + videoids + '/timezone/+08/version/5/source/video'
    req = urllib.request.Request(url);
    req.add_header('Referer', 'http://static.youku.com/v1.0.0307/v/swf/player_yk.swf');
    req.add_header('User-Agent', 'Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.17 (KHTML, like Gecko) Chrome/24.0.1312.56 Safari/537.17');
    play_list = urllib.request.urlopen(req).read().decode("utf8");
   
    play_list_data = json.loads(play_list)['data'][0];
    seed = play_list_data['seed'];
    streamfileids = play_list_data['streamfileids'];
    regs = play_list_data['segs'];
    
    type_fileid = streamfileids[flv_type];
    type_list = regs[flv_type];
    url_type = flv_type;
    if url_type == 'hd2':
        url_type = 'flv'
    
    type_list_count = len(type_list);
    i = 0;
    while i < type_list_count :
        fileid = GetFildId(type_fileid, seed);
        fileid = fileid[:8] + ("%0.2X" % i) + fileid[10:];
        fileid += '?k=';
        fileid += type_list[i]['k'];
        flv_path = 'http://f.youku.com/player/getFlvPath/sid/00_00/st/'+url_type+'/fileid/' + fileid;
        print(flv_path);
        i += 1;
        
def GetVideoIdsFromUrl(url):
    url_object = urllib.parse.urlparse(url);
    url_path = url_object.path;
    return url_path[11:-5]

def GetFlvPathFromUrl(url, video_type):
    video_ids = GetVideoIdsFromUrl(url);
    GetFlvPath(video_ids, video_type);

if __name__ == '__main__':
    if len(sys.argv) == 3:
        GetFlvPathFromUrl(sys.argv[1], sys.argv[2]);
    else:
        print("youku.py  ");