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#-*- coding: utf8 -*-
import requests
import json
import hashlib
import base64
import hmac
import datetime
import uuid

METHOD_GET = 'GET'
METHOD_POST = 'POST'

#官網accessKey
AK = '3d98d123d633xxxxxxxxxxx5a60d4bb3'
#官網securityKey
SK = '173615ae4177xxxxxxxxxxxd17b1c3ed'

def hmac_sha256(secret, data):
    secret = bytearray(secret)
    data = bytearray(data)
    return hmac.new(secret, data, digestmod=hashlib.sha256).digest()

def base64_of_hmac(data):
    return base64.b64encode(data)

def get_request_uuid():
    return str(uuid.uuid1())

def get_sorted_str(data):
    """
    鑒權用的參數整理
    :param data: dict 需要整理的參數
    :return: str
    """
    sorted_data = sorted(data.items(), key=lambda item: item[0])
    str_list = map(lambda x_y: '%s=%s' % (x_y[0], x_y[1]), sorted_data)
    return '&'.join(str_list)

def build_sign(query_params, body_params, eop_date, request_uuid):
    """
    計算鑒權字段
    :param query_params: dict get請求中的參數
    :param body_params: dict post請求中的參數
    :param eop_date: str 請求時間，格式為：'%Y%m%dT%H%M%SZ'
    :return: str
    """
    #body_str = json.dumps(body_params) if body_params else ''
    body_str = json.dumps(body_params)
    body_digest = hashlib.sha256(body_str.encode('utf-8')).hexdigest()
    #請求頭中必要的兩個參數
    header_str = 'ctyun-eop-request-id:%s\neop-date:%s\n' % (request_uuid,       eop_date)
    #url中的參數，或get參數
    query_str = get_sorted_str(query_params)
  
    signature_str = '%s\n%s\n%s' % (header_str, query_str, body_digest)
  
    print_log(repr('signature_str is: %s' % signature_str))
    sign_date = eop_date.split('T')[0]
  
    #計算鑒權密鑰
    k_time = hmac_sha256(SK, eop_date)
    k_ak = hmac_sha256(k_time, AK)
    k_date = hmac_sha256(k_ak, sign_date)
  
    signature_base64 = base64_of_hmac(hmac_sha256(k_date, signature_str))
  
    #構建請求頭的鑒權字段值
  
    sign_header = '%s Headers=ctyun-eop-request-id;eop-date Signature=%s' % (AK, signature_base64)
    return sign_header

def get_sign_headers(query_params, body):
    """
    獲取鑒權用的請求頭參數
    :param query_params: dict get請求中的參數
    :param body: dict post請求中的參數
    :return:
    """
    now = datetime.datetime.now()
    eop_date = datetime.datetime.strftime(now, '%Y%m%dT%H%M%SZ')
    request_uuid = get_request_uuid()
    headers = {  # 三個鑒權用的參數
       'eop-date': eop_date,
       'ctyun-eop-request-id': request_uuid,
       'Eop-Authorization': build_sign(query_params=query_params,    body_params=body, eop_date=eop_date,
                                    request_uuid=request_uuid),
    }
    return headers

def get(url, params=None, header_params=None, get_body=None):
    return execute(url, method=METHOD_GET, params=params,  header_params=header_params, get_body=get_body)

def post(url, params=None, header_params=None):
    return execute(url, method=METHOD_POST, params=params, header_params=header_params)

def execute(url, method, params=None, header_params=None, get_body=None):
    get_body = get_body or {}
    params = params or {}
    header_params = header_params or {}
    query_params, body = (params, get_body) if method == METHOD_GET else ({}, params)
    headers = get_sign_headers(query_params, body)
    headers.update(header_params)

    print_log(u'url: %s' % url)
    print_log(u'請求方式: %s' % method)
    print_log(u'請求頭: %s' % headers)
    print_log(u'請求參數: %s' % params)

    if method == METHOD_GET:
       res = requests.get(url, params=params, headers=headers, verify=False,    json=get_body)
    else:
       res = requests.post(url, json=params, headers=headers, verify=False)
  
    print_log(u'返回狀態碼: %s' % res.status_code)
    print_log(u'返回: %s' % res.text)
    return res

def print_log(log_info):
    now = datetime.datetime.now()
    log_info = u'[%s]: %s' % (str(now), log_info)
    print log_info

#操作類示例
post("//ctcdr-global.ctapi.daliqc.cn/v4/disaster/open-service-disaster",
     params={
         "regionID": "41f64827xxxxxxxxxffa3a5deb5d15d"
     })

#查詢類示例
get("//ctcdr-global.ctapi.daliqc.cn/v4/disaster/info-pair-disaster",
     params={
        "regionID": "81f772xxxxxxxxxxx307d5b"
    })