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
# 計算簽名
def get_signature(ak, sk, app_key, params):
# 創建待簽名字符串
# 一、header部分
# 主要包括3個header需要作為簽名內容：appkey、ctyun-eop-request-id、eop-date
# 1. 首先通過uuid生成ctyun-eop-request-id
request_id = str(uuid.uuid1())
# 2. 獲取當前時間戳并對時間進行格式化
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. 對header部分按照字母順序進行排序并格式化
camp_header = "appkey:{0}\nctyun-eop-request-id:{1}\neop-date:{2}\n".format(app_key, request_id, eop_date)
# 二、query部分
# 對url的query部分進行排序
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參數進行sha256摘要
# sha256 body
content_hash = sha256(json.dumps(params)).lower()
# 完成創建待簽名字符串
pre_signature = camp_header + "\n" + after_query + "\n" + content_hash
# 構造動態密鑰
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"))
# 簽名的使用
signature = hmac_sha256(base64.b64decode(k_date), pre_signature.encode("utf-8"))
# 將數據整合得到真正的header中的內容
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
# 向服務發送請求
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("請求失敗")
if __name__ == '__main__':
# 請求地址，下面為示例地址，需要替換為請求能力的地址
request_url = "//ai-global.ctapi.daliqc.cn/XXXXXXXXXXX"
# 官網accessKey，登錄云網門戶，在“賬號中心”>“安全設置”>“登錄保護”>“用戶AccessKey”點擊查看獲取
ctyun_ak = 'accessKey'
# 官網securityKey，登錄云網門戶，在“賬號中心”>“安全設置”>“登錄保護”>“用戶AccessKey”點擊查看獲取，securityKey只在創建時展示
ctyun_sk = 'securityKey'
# 產品控制臺（//ai.daliqc.cn/console/apps/list）-我的應用中獲取的appKey
ai_app_key = 'appKey'
# body內容從本地文件中獲取
# 打開圖片文件
f = open(r'test.jpeg', 'rb')
img_base64 = base64.b64encode(f.read()).decode()
# body內容，替換為請求能力的參數，具體參數參考能力的API文檔
params = {"imageContent": img_base64}
# 調用get_signature方法獲取簽名
request_id, eop_date, sign_header = get_signature(ctyun_ak, ctyun_sk, ai_app_key, params)
# 生成請求header
# 請求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.daliqc.cn'
}
print("請求頭部:")
print(headers)
# 執行post請求
do_post(request_url, headers, params)
