Python3生成腾讯云cos的签名sign

这两天在折腾有关腾讯云的对象存储COS功能，之前用java语言写过，下载了相关的SDK，这次开发语言变为了python，遇到从bucket桶中下载私有读写文件的签名问题，一般的文件下载链接格式如下：
https://桶名-APP_ID.cos.所属区.myqcloud.com/test.txt?sign=XXXX
前面路径好说，关键是生成签名问题，下面便是用python生成签名的代码：

#!/usr/local/bin/python3
# coding=utf-8

import time
import random
import hmac
import hashlib
import base64

SecretId = 'XXXXXXXXXXXXXXXXXXX'
SecretKey = 'XXXXXXXXXXXXXXXXX'
Bucket = 'XXXXXX'
AppId = '125xxxxx06'
TimeStamp = int(time.time())
ExpireTime = TimeStamp + 86400 * 90
Random = random.randint(0, 100000)
Original = "a="+AppId+"&b="+Bucket+"&k="+SecretId+"&e="+str(ExpireTime)+"&t="+str(TimeStamp)+"&r="+str(Random)+"&f="

Hmac = hmac.new(bytes(SecretKey, 'utf-8'), bytes(Original, 'utf-8'), hashlib.sha1)
Sha1 = Hmac.digest()
Signature = bytes(Sha1) + bytes(Original, 'utf-8')
Signature2 = base64.b64encode(Signature)
-- 最后生成的sign如下
sign = str(Signature2, 'UTF-8')
print("Original: ", Original)
print("HMAC-SHA1: ", Sha1)
print("Signature before BASE64: ", Signature)
print("Signature after BASE64: ", sign)

以上希望对大家有用~

生成逻辑及签名工具请参考官方文档：

签名工具

签名算法