analysis_video.py

import urllib.request, urllib.parse, urllib.error
import re
import hashlib


def get_gcid(murl):
    '''
    gcid is a critical parameter to acquire vidoe address and key value
    and it is stored in mobile web page, which is represented as murl
    '''
    with urllib.request.urlopen(murl) as fhand:
        for line in fhand:
            if re.search(b'msurls', line):
                line = line.rstrip()
                line = line.split(b',')
                for item in line:
                    if re.search(b'msurls', item):
                        ids = item.split(b'/')
                        gcid = str(ids[4].upper())
                        gcid = re.sub('b|\'', '', gcid)
                        return gcid

def get_url(gcid):
    ''' 
    '''
    #send a GET request to a page with gcid as parameter
    url1 = 'http://mp4.cl.kankan.com/getCdnresource_flv?gcid=' + gcid
    response = urllib.request.urlopen(url1)
    html_doc = response.read().decode("utf-8")
    script_text = str(html_doc)
    lines = script_text.split()
    #get video adress
    addr = lines[17]
    addr = re.sub('\"', ' ', addr)
    addr = addr.split()
    ip = addr[1]
    address = addr[3]
    #get parameters and encode them with md5 to get final key value
    keys = lines[23]
    key_list = re.sub('\{|\:|,|\}', ' ', keys)
    keys = key_list.split()
    param1 = keys[1]
    param2 = keys[3]
    preco = 'xl_mp43651'
    key0 = preco + param1 + param2
    m = hashlib.md5()
    m.update(key0.encode('utf-8'))
    key0 = m.hexdigest()
    #form the final url, the real address of video
    url = 'http://' + ip +':80/' + address + '?key=' + key0 + '&key1' + param2
    return url

if __name__ == '__main__':
    #translate the web url into mobile url
    #which consist of gcid information
    inurl = input('please input the original url of video:\n')
    murl = re.sub('vod', 'm', inurl)

    gcid = get_gcid(murl)
    print(get_url(gcid))