# -*- coding: utf-8 -*-
from __future__ import absolute_import, unicode_literals
import inspect
import logging
import requests
import xmltodict
from xml.parsers.expat import ExpatError
from optionaldict import optionaldict
from wechatpy.crypto import WeChatRefundCrypto
from wechatpy.utils import random_string
from wechatpy.exceptions import WeChatPayException, InvalidSignatureException
from wechatpy.pay.utils import (
calculate_signature, calculate_signature_hmac, _check_signature, dict_to_xml
)
from wechatpy.pay.base import BaseWeChatPayAPI
from wechatpy.pay import api
logger = logging.getLogger(__name__)
def _is_api_endpoint(obj):
return isinstance(obj, BaseWeChatPayAPI)
[文档]class WeChatPay(object):
"""
微信支付接口
:param appid: 微信公众号 appid
:param sub_appid: 当前调起支付的小程序APPID
:param api_key: 商户 key,不要在这里使用小程序的密钥
:param mch_id: 商户号
:param sub_mch_id: 可选，子商户号，受理模式下必填
:param mch_cert: 必填，商户证书路径
:param mch_key: 必填，商户证书私钥路径
:param timeout: 可选，请求超时时间，单位秒，默认无超时设置
:param sandbox: 可选，是否使用测试环境，默认为 False
"""
redpack = api.WeChatRedpack()
"""红包接口"""
transfer = api.WeChatTransfer()
"""企业付款接口"""
coupon = api.WeChatCoupon()
"""代金券接口"""
order = api.WeChatOrder()
"""订单接口"""
refund = api.WeChatRefund()
"""退款接口"""
micropay = api.WeChatMicroPay()
"""刷卡支付接口"""
tools = api.WeChatTools()
"""工具类接口"""
jsapi = api.WeChatJSAPI()
"""公众号网页 JS 支付接口"""
withhold = api.WeChatWithhold()
"""代扣接口"""
API_BASE_URL = 'https://api.mch.weixin.qq.com/'
def __new__(cls, *args, **kwargs):
self = super(WeChatPay, cls).__new__(cls)
api_endpoints = inspect.getmembers(self, _is_api_endpoint)
for name, _api in api_endpoints:
api_cls = type(_api)
_api = api_cls(self)
setattr(self, name, _api)
return self
def __init__(self, appid, api_key, mch_id, sub_mch_id=None,
mch_cert=None, mch_key=None, timeout=None, sandbox=False, sub_appid=None):
self.appid = appid
self.sub_appid = sub_appid
self.api_key = api_key
self.mch_id = mch_id
self.sub_mch_id = sub_mch_id
self.mch_cert = mch_cert
self.mch_key = mch_key
self.timeout = timeout
self.sandbox = sandbox
self._sandbox_api_key = None
self._http = requests.Session()
def _fetch_sandbox_api_key(self):
nonce_str = random_string(32)
sign = calculate_signature({'mch_id': self.mch_id, 'nonce_str': nonce_str}, self.api_key)
payload = dict_to_xml({
'mch_id': self.mch_id,
'nonce_str': nonce_str,
}, sign=sign)
headers = {'Content-Type': 'text/xml'}
api_url = '{base}sandboxnew/pay/getsignkey'.format(base=self.API_BASE_URL)
response = self._http.post(api_url, data=payload, headers=headers)
return xmltodict.parse(response.text)['xml'].get('sandbox_signkey')
def _request(self, method, url_or_endpoint, **kwargs):
if not url_or_endpoint.startswith(('http://', 'https://')):
api_base_url = kwargs.pop('api_base_url', self.API_BASE_URL)
if self.sandbox:
api_base_url = '{url}sandboxnew/'.format(url=api_base_url)
url = '{base}{endpoint}'.format(
base=api_base_url,
endpoint=url_or_endpoint
)
else:
url = url_or_endpoint
if isinstance(kwargs.get('data', ''), dict):
data = kwargs['data']
if 'mchid' not in data:
# Fuck Tencent
data.setdefault('mch_id', self.mch_id)
data.setdefault('sub_mch_id', self.sub_mch_id)
data.setdefault('nonce_str', random_string(32))
data = optionaldict(data)
if data.get('sign_type', 'MD5') == 'HMAC-SHA256':
sign = calculate_signature_hmac(data, self.sandbox_api_key if self.sandbox else self.api_key)
else:
sign = calculate_signature(data, self.sandbox_api_key if self.sandbox else self.api_key)
body = dict_to_xml(data, sign)
body = body.encode('utf-8')
kwargs['data'] = body
# 商户证书
if self.mch_cert and self.mch_key:
kwargs['cert'] = (self.mch_cert, self.mch_key)
kwargs['timeout'] = kwargs.get('timeout', self.timeout)
logger.debug('Request to WeChat API: %s %s\n%s', method, url, kwargs)
res = self._http.request(
method=method,
url=url,
**kwargs
)
try:
res.raise_for_status()
except requests.RequestException as reqe:
raise WeChatPayException(
return_code=None,
client=self,
request=reqe.request,
response=reqe.response
)
return self._handle_result(res)
def _handle_result(self, res):
res.encoding = 'utf-8'
xml = res.text
logger.debug('Response from WeChat API \n %s', xml)
try:
data = xmltodict.parse(xml)['xml']
except (xmltodict.ParsingInterrupted, ExpatError):
# 解析 XML 失败
logger.debug('WeChat payment result xml parsing error', exc_info=True)
return xml
return_code = data['return_code']
return_msg = data.get('return_msg')
result_code = data.get('result_code')
errcode = data.get('err_code')
errmsg = data.get('err_code_des')
if return_code != 'SUCCESS' or result_code != 'SUCCESS':
# 返回状态码不为成功
raise WeChatPayException(
return_code,
result_code,
return_msg,
errcode,
errmsg,
client=self,
request=res.request,
response=res
)
return data
def get(self, url, **kwargs):
return self._request(
method='get',
url_or_endpoint=url,
**kwargs
)
def post(self, url, **kwargs):
return self._request(
method='post',
url_or_endpoint=url,
**kwargs
)
def check_signature(self, params):
return _check_signature(params, self.api_key if not self.sandbox else self.sandbox_api_key)
[文档] @classmethod
def get_payment_data(cls, xml):
"""
解析微信支付结果通知，获得appid, mch_id, out_trade_no, transaction_id
如果你需要进一步判断，请先用appid, mch_id来生成WeChatPay,
然后用`wechatpay.parse_payment_result(xml)`来校验支付结果
使用示例::
from wechatpy.pay import WeChatPay
# 假设你已经获取了微信服务器推送的请求中的xml数据并存入xml变量
data = WeChatPay.get_payment_appid(xml)
{
"appid": "公众号或者小程序的id",
"mch_id": "商户id",
}
"""
try:
data = xmltodict.parse(xml)
except (xmltodict.ParsingInterrupted, ExpatError):
raise ValueError("invalid xml")
if not data or 'xml' not in data:
raise ValueError("invalid xml")
data = data["xml"]
return {
"appid": data["appid"],
"mch_id": data["mch_id"],
"out_trade_no": data["out_trade_no"],
"transaction_id": data["transaction_id"],
}
[文档] def parse_payment_result(self, xml):
"""解析微信支付结果通知"""
try:
data = xmltodict.parse(xml)
except (xmltodict.ParsingInterrupted, ExpatError):
raise InvalidSignatureException()
if not data or 'xml' not in data:
raise InvalidSignatureException()
data = data['xml']
sign = data.pop('sign', None)
real_sign = calculate_signature(data, self.api_key if not self.sandbox else self.sandbox_api_key)
if sign != real_sign:
raise InvalidSignatureException()
for key in ('total_fee', 'settlement_total_fee', 'cash_fee', 'coupon_fee', 'coupon_count'):
if key in data:
data[key] = int(data[key])
data['sign'] = sign
return data
[文档] def parse_refund_notify_result(self, xml):
"""解析微信退款结果通知"""
refund_crypto = WeChatRefundCrypto(self.api_key if not self.sandbox else self.sandbox_api_key)
data = refund_crypto.decrypt_message(xml, self.appid, self.mch_id)
for key in ('total_fee', 'settlement_total_fee', 'refund_fee', 'settlement_refund_fee'):
if key in data:
data[key] = int(data[key])
return data
@property
def sandbox_api_key(self):
if self.sandbox and self._sandbox_api_key is None:
self._sandbox_api_key = self._fetch_sandbox_api_key()
return self._sandbox_api_key