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douyin checksum calc.
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# -*- coding: utf-8 -*- | |
# @Time : 2017/12/23 16:07 | |
# @Author : ddvv | |
# @Site : | |
# @File : douyincore.py | |
# @Software: PyCharm | |
import hashlib | |
class calcSig(object): | |
key1 = '57218436' | |
key2 = '15387264' | |
rstr = 'efc84c17' | |
def shuffle(self, p1, p2): | |
p = '' | |
p += p1[int(p2[0], 10) - 1] | |
p += p1[int(p2[1], 10) - 1] | |
p += p1[int(p2[2], 10) - 1] | |
p += p1[int(p2[3], 10) - 1] | |
p += p1[int(p2[4], 10) - 1] | |
p += p1[int(p2[5], 10) - 1] | |
p += p1[int(p2[6], 10) - 1] | |
p += p1[int(p2[7], 10) - 1] | |
return p.lower() | |
# 生成 as和cp字段 | |
def ppp(self, u_md5, u_key1, u_key2): | |
ascp = [0] * 36 | |
ascp[0] = 'a' | |
ascp[1] = '1' | |
for i in range(0, 8): | |
ascp[2 * (i + 1)] = u_md5[i] | |
ascp[2 * i + 3] = u_key2[i] | |
ascp[2 * i + 18] = u_key1[i] | |
ascp[2 * i + 1 + 18] = u_md5[i + 24] | |
ascp[-2] = 'e' | |
ascp[-1] = '1' | |
return ''.join(ascp) | |
# 解析url参数 | |
def parseURL(self, url): | |
param_index = url.find('?') | |
param = url[param_index + 1:] | |
param_list = param.split('&') | |
param_list.append('rstr='+self.rstr) | |
param_list = sorted(param_list) | |
result = '' | |
for a in param_list: | |
tmp = a.split('=') | |
tmp[1] = tmp[1].replace('+', 'a') | |
tmp[1] = tmp[1].replace(' ', 'a') | |
result += tmp[1] | |
return result | |
# 计算md5 | |
def calcMD5(self, str_encode): | |
m = hashlib.md5() | |
m.update(str_encode.encode('utf-8')) | |
return m.hexdigest() | |
def work(self, url, curtime): | |
url_param = self.parseURL(url) | |
p_md5 = self.calcMD5(url_param) | |
if curtime & 1: | |
p_md5 = self.calcMD5(p_md5) | |
hexTime = hex(curtime)[2:] | |
aa = self.shuffle(hexTime, self.key1) | |
bb = self.shuffle(hexTime, self.key2) | |
sig = self.ppp(p_md5, aa, bb) | |
return ('%s&as=%s&cp=%s' % (url, sig[:18], sig[18:])) | |
def main(): | |
c = calcSig() | |
url = '/aweme/v1/comment/list/?aweme_id=5506468984815426696&cursor=0&count=20&comment_style=2&ts=1516946960&app_type=normal&os_api=23&device_type=HUAWEI NXT-AL10&device_platform=android&ssmix=a&iid=22634572655&manifest_version_code=166&dpi=480&uuid=863336037184660&version_code=166&app_name=aweme&version_name=1.6.6&openudid=3f4f9a09bd6ea55e&device_id=46408460323&resolution=1080*1812&os_version=6.0&language=zh&device_brand=HUAWEI&ac=wifi&update_version_code=1662&aid=1128&channel=aweGW&_rticket=1516946961275' | |
t = 1516946960 | |
print(c.work(url,t)) | |
if __name__ == "__main__": | |
main() |
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