import hmac

import base64

import hashlib

import json

import time

import uuid

import requests

from urllib.parse import urlparse

def sha256 (content):

x = hashlib.sha256()

x.update(content.encode())

return x.hexdigest().upper()

def hmac_sha256 (key, content):

sign = hmac.new(key, content, digestmod="sha256").digest()

ret = base64.b64encode(sign)

return ret

# 计算签名

def get_signature (ak, sk, app_key, params):

*# 创建待签名字符串*

*# 一、header部分*

*# 主要包括3个header需要作为签名内容：appkey、ctyun-eop-request-id、eop-date*

*# 1. 首先通过uuid生成ctyun-eop-request-id*

request_id = str(uuid.uuid1())

*# 2. 获取当前时间戳并对时间进行格式化*

now_time = time.localtime()

eop_date = time.strftime("%Y%m%dT%H%M%SZ", now_time)

eop_date_simple = time.strftime("%Y%m%d", now_time)

*# 3. 对header部分按照字母顺序进行排序并格式化*

camp_header = "appkey:{0}\nctyun-eop-request-id:{1}\neop-date:{2}\n".format(app_key, request_id, eop_date)

*# 二、query部分*

*# 对url的query部分进行排序*

parsed_url = urlparse(request_url)

query = parsed_url.query

query_params =  **sorted** (query.split("&"))

after_query = ""

for query_param in query_params:

    if  **len** (after_query) < 1:

        after_query += query_param

    else:

        after_query += "&" + query_param

*# 三、body参数进行sha256摘要*

*# sha256 body*

content_hash = sha256(json.dumps(params)).lower()

*# 完成创建待签名字符串*

pre_signature = camp_header + "\n" + after_query + "\n" + content_hash

*# 构造动态密钥*

k_time = hmac_sha256(sk.encode("utf-8"), eop_date.encode("utf-8"))

k_ak = hmac_sha256(base64.b64decode(k_time), ak.encode("utf-8"))

k_date = hmac_sha256(base64.b64decode(k_ak), eop_date_simple.encode("utf-8"))

*# 签名的使用*

signature = hmac_sha256(base64.b64decode(k_date), pre_signature.encode("utf-8"))

*# 将数据整合得到真正的header中的内容*

sign_header = "{0} Headers=appkey;ctyun-eop-request-id;eop-date Signature={1}".format(ak, signature.decode())

*# 返回request-id eop-date和sign_header*

return request_id, eop_date, sign_header

# 向服务发送请求

def do_post (url, headers, params):

response = requests.post(url, data=json.dumps(params), headers=headers)

try:

     **print** (response.status_code)

     **print** (response.json())

except AttributeError:

     **print** ("请求失败")

if name == 'main':

*# 请求地址，替换为请求能力的地址*

request_url = "https://ai-global.ctapi.ctyun.cn/v1/aiop/api/2f6hqix09mv4/face/PERSON/person/detectFaceFromBase64"

*# 官网accessKey，登录云网门户，在“账号中心”->“安全设置”->“登录保护”->“用户AccessKey”点击“查看”获取。*

ctyun_ak = 'accessKey'

*# 官网securityKey，登录云网门户，在“账号中心”->“安全设置”->“登录保护”->“用户AccessKey”点击“查看”获取，securityKey只在创建时展示*

ctyun_sk = 'securityKey'

*#产品控制台（https://ai.ctyun.cn/console/apps/list）-我的应用中获取的appKey*

ai_app_key = 'appKey'

*# body内容从本地文件中获取*

*# 打开图片文件*

f =  **open** (r'test.jpeg', 'rb')

img_base64 = base64.b64encode(f.read()).decode()

*# body内容，替换为请求能力的参数，具体参数参考能力的API文档*

params = {"imageContent": img_base64}

*# 调用get_signature方法获取签名*

request_id, eop_date, sign_header = get_signature(ctyun_ak, ctyun_sk, ai_app_key, params)

*# 生成请求header*

*# 请求header*

headers = {

    'Content-Type': 'application/json;charset=UTF-8',

    'ctyun-eop-request-id': request_id,

    'appkey': ai_app_key,

    'Eop-Authorization': sign_header,

    'eop-date': eop_date,

    'host': 'ai-global.ctapi.ctyun.cn'

}

 **print** ("请求头部:")

 **print** (headers)

*# 执行post请求*

do_post(request_url, headers, params)