在django中实现支付宝支付(支付宝接口调用)

支付宝支付
正式环境:用营业执照,申请商户号,appid
测试环境:沙箱环境:https://openhome.alipay.com/platform/appDaily.htm?tab=info
支付宝提供接口:给商户使用,收钱
-Java,php,C#的demo,没有python的demo
-git有人封装了
-需要安装模块:pip3 install 
-应用私钥---自己保存,一定不能丢
-应用公钥---给别人用
-支付宝公钥---支付宝用的
-生成公钥私钥:https://docs.open.alipay.com/291/105971
-把应用公钥配置在支付宝上:应用公钥,配置完成以后,支付宝自动生成一个支付宝公钥
-在程序中:配置应用私钥,支付宝公钥
-如果支付成功,支付宝会回调,但是如果你的服务器挂掉了怎么办?
-支付宝24小时以内不定时再给你发,你修改掉订单状态即可
-支付成功,支付宝会有一个get回调,一个post回调:修改订单状态

一  支付宝接口

from datetime import datetime
from Crypto.PublicKey import RSA
from Crypto.Signature import PKCS1_v1_5
from Crypto.Hash import SHA256
from urllib.parse import quote_plus
from base64 import decodebytes, encodebytes
import json

class AliPay(object):
    """
    支付宝支付接口(PC端支付接口)
    """
    def __init__(self, appid, app_notify_url, app_private_key_path,
                 alipay_public_key_path, return_url, debug=False):
        self.appid = appid
        self.app_notify_url = app_notify_url
        self.app_private_key_path = app_private_key_path
        self.app_private_key = None
        self.return_url = return_url
        with open(self.app_private_key_path) as fp:
            self.app_private_key = RSA.importKey(fp.read())
        self.alipay_public_key_path = alipay_public_key_path
        with open(self.alipay_public_key_path) as fp:
            self.alipay_public_key = RSA.importKey(fp.read())

        if debug is True:
            self.__gateway = "https://openapi.alipaydev.com/gateway.do"
        else:
            self.__gateway = "https://openapi.alipay.com/gateway.do"

    def direct_pay(self, subject, out_trade_no, total_amount, return_url=None, **kwargs):
        biz_content = {
            "subject": subject,
            "out_trade_no": out_trade_no,
            "total_amount": total_amount,
            "product_code": "FAST_INSTANT_TRADE_PAY",
            # "qr_pay_mode":4
        }

        biz_content.update(kwargs)
        data = self.build_body("alipay.trade.page.pay", biz_content, self.return_url)
        return self.sign_data(data)

    def build_body(self, method, biz_content, return_url=None):
        data = {
            "app_id": self.appid,
            "method": method,
            "charset": "utf-8",
            "sign_type": "RSA2",
            "timestamp": datetime.now().strftime("%Y-%m-%d %H:%M:%S"),
            "version": "1.0",
            "biz_content": biz_content
        }

        if return_url is not None:
            data["notify_url"] = self.app_notify_url
            data["return_url"] = self.return_url

        return data

    def sign_data(self, data):
        data.pop("sign", None)
        # 排序后的字符串
        unsigned_items = self.ordered_data(data)
        unsigned_string = "&".join("{0}={1}".format(k, v) for k, v in unsigned_items)
        sign = self.sign(unsigned_string.encode("utf-8"))
        # ordered_items = self.ordered_data(data)
        quoted_string = "&".join("{0}={1}".format(k, quote_plus(v)) for k, v in unsigned_items)

        # 获得最终的订单信息字符串
        signed_string = quoted_string + "&sign=" + quote_plus(sign)
        return signed_string

    def ordered_data(self, data):
        complex_keys = []
        for key, value in data.items():
            if isinstance(value, dict):
                complex_keys.append(key)

        # 将字典类型的数据dump出来
        for key in complex_keys:
            data[key] = json.dumps(data[key], separators=(',', ':'))

        return sorted([(k, v) for k, v in data.items()])

    def sign(self, unsigned_string):
        # 开始计算签名
        key = self.app_private_key
        signer = PKCS1_v1_5.new(key)
        signature = signer.sign(SHA256.new(unsigned_string))
        # base64 编码，转换为unicode表示并移除回车
        sign = encodebytes(signature).decode("utf8").replace("
", "")
        return sign

    def _verify(self, raw_content, signature):
        # 开始计算签名
        key = self.alipay_public_key
        signer = PKCS1_v1_5.new(key)
        digest = SHA256.new()
        digest.update(raw_content.encode("utf8"))
        if signer.verify(digest, decodebytes(signature.encode("utf8"))):
            return True
        return False

    def verify(self, data, signature):
        if "sign_type" in data:
            sign_type = data.pop("sign_type")
        # 排序后的字符串
        unsigned_items = self.ordered_data(data)
        message = "&".join(u"{}={}".format(k, v) for k, v in unsigned_items)
        return self._verify(message, signature)

二  视图函数

from django.shortcuts import render, redirect, HttpResponse
from utils.pay import AliPay
import json
import time
def ali():
    # 沙箱环境地址：https://openhome.alipay.com/platform/appDaily.htm?tab=info
    app_id = "2016092000554611"
    # 支付宝收到用户的支付,会向商户发两个请求,一个get请求,一个post请求
    # POST请求，用于最后的检测
    notify_url = "http://42.56.89.12:80/page2/"
    # GET请求，用于页面的跳转展示
    return_url = "http://42.56.89.12:80/page2/"
    merchant_private_key_path = "keys/app_private_2048.txt"
    alipay_public_key_path = "keys/alipay_public_2048.txt"
    # 生成一个AliPay的对象
    alipay = AliPay(
        appid=app_id,
        app_notify_url=notify_url,
        return_url=return_url,
        app_private_key_path=merchant_private_key_path,
        alipay_public_key_path=alipay_public_key_path,  # 支付宝的公钥，验证支付宝回传消息使用，不是你自己的公钥
        debug=True,  # 默认False,
    )
    return alipay


def page1(request):
    if request.method == "GET":

        return render(request, 'page1.html')
    else:
        money = float(request.POST.get('money'))
        # 生成一个对象
        alipay = ali()
        # 生成支付的url
        # 对象调用direct_pay
        query_params = alipay.direct_pay(
            subject="充气娃娃",  # 商品简单描述
            out_trade_no="x2" + str(time.time()),  # 商户订单号
            total_amount=money,  # 交易金额(单位: 元 保留俩位小数)
        )

        pay_url = "https://openapi.alipaydev.com/gateway.do?{}".format(query_params)
        print(pay_url)
        # 朝这个地址发get请求
        return redirect(pay_url)


def page2(request):
    alipay = ali()
    if request.method == "POST":
        # 检测是否支付成功
        # 去请求体中获取所有返回的数据：状态/订单号
        from urllib.parse import parse_qs
        body_str = request.body.decode('utf-8')
        print(body_str)

        post_data = parse_qs(body_str)
        print('支付宝给我的数据:::---------',post_data)
        post_dict = {}
        for k, v in post_data.items():
            post_dict[k] = v[0]
        print('转完之后的字典',post_dict)

        sign = post_dict.pop('sign', None)
        status = alipay.verify(post_dict, sign)
        print('POST验证', status)
        return HttpResponse('POST返回')

    else:
        params = request.GET.dict()
        sign = params.pop('sign', None)
        status = alipay.verify(params, sign)
        print('GET验证', status)
        return HttpResponse('支付成功')