Python快速開發支付寶支付方法

1、前期准備（安裝依賴模塊）

pip3 install pycryptodome

2、去螞蟻金服開放平台申請

螞蟻金服開放平台網址

https://open.alipay.com/platform/home.htm

注冊流程（注意正式支付開發與其一樣只不過獲取就不是沙箱的各項信息了）

登錄螞蟻金服開放平台（與支付寶同意賬號）---》注冊成為開發者---》填寫各種信息---》成功后點擊頂部開發者中心----》啟動沙箱環境---》沙箱應用-----》生成RSA2(SHA256)密鑰(推薦）【查看生成方法文檔】-----填寫完畢

3由於螞蟻金服未提供Python開發的SDK（需要去github上下載其方法）

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 urllib.parse import urlparse, parse_qs
from base64 import decodebytes, encodebytes
import json


class AliPay(object):
    """
    支付寶支付接口(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())
        # 注意如果debug如果不是True將不是沙箱環境【標識非正式環境url中含有dev字樣】
        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)

        # 獲得最終的訂單信息字符串
        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)

        # 將字典類型的數據dump出來
        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):
        # 開始計算簽名
        key = self.app_private_key
        signer = PKCS1_v1_5.new(key)
        signature = signer.sign(SHA256.new(unsigned_string))
        # base64 編碼，轉換為unicode表示並移除回車
        sign = encodebytes(signature).decode("utf8").replace("\n", "")
        return sign

    def _verify(self, raw_content, signature):
        # 開始計算簽名
        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)

4、其他部分源碼

<!DOCTYPE html>
<html lang="zh-CN">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <meta name="viewport" content="width=device-width, initial-scale=1">
</head>
<body>
    <form method="post">
        {% csrf_token %}
        <input type="text" name="price" placeholder="請輸入要支付的金額">
        <input type="submit" value="支付">
    </form>
</body>
</html>

from django.shortcuts import render,redirect,HttpResponse
from django.views.decorators.csrf import csrf_exempt
from utils.pay import AliPay
import time
from django.conf import settings

def aliPay():
    obj = AliPay(
        appid=settings.APPID,
        app_notify_url=settings.NOTIFY_URL,  # 如果支付成功，支付寶會向這個地址發送POST請求（校驗是否支付已經完成）
        return_url=settings.RETURN_URL,  # 如果支付成功，重定向回到你的網站的地址。
        alipay_public_key_path=settings.PUB_KEY_PATH,  # 支付寶公鑰
        app_private_key_path=settings.PRI_KEY_PATH,  # 應用私鑰
        debug=True,  # 默認False,
    )
    return obj

def index(request):
    if request.method == 'GET':
        return render(request,'index.html')



    alipay = aliPay()

    # 對購買的數據進行加密
    money = float(request.POST.get('price'))
    out_trade_no = "x2" + str(time.time())
    # 1. 在數據庫創建一條數據：狀態（待支付）

    query_params = alipay.direct_pay(
        subject="【全地形代步工具而二點零】",  # 商品簡單描述
        out_trade_no= out_trade_no,  # 商戶訂單號
        total_amount=money,  # 交易金額(單位: 元 保留倆位小數)
    )

    pay_url = "https://openapi.alipaydev.com/gateway.do?{}".format(query_params)

    return redirect(pay_url)


def pay_result(request):
    """
    支付完成后，跳轉回的地址
    :param request:
    :return:
    """
    params = request.GET.dict()
    sign = params.pop('sign', None)

    alipay = aliPay()

    status = alipay.verify(params, sign)

    if status:
        return HttpResponse('支付成功')
    return HttpResponse('支付失敗')



@csrf_exempt
def update_order(request):
    """
    支付成功后，支付寶向該地址發送的POST請求（用於修改訂單狀態）
    :param request:
    :return:
    """
    if request.method == 'POST':
        from urllib.parse import parse_qs

        body_str = request.body.decode('utf-8')
        post_data = parse_qs(body_str)

        post_dict = {}
        for k, v in post_data.items():
            post_dict[k] = v[0]

        alipay = aliPay()

        sign = post_dict.pop('sign', None)
        status = alipay.verify(post_dict, sign)
        if status:
            # 修改訂單狀態
            out_trade_no = post_dict.get('out_trade_no')
            print(out_trade_no)
            # 2. 根據訂單號將數據庫中的數據進行更新
            return HttpResponse('支付成功')
        else:
            return HttpResponse('支付失敗')
    return HttpResponse('')

from django.conf.urls import url
from django.contrib import admin
from pay import views
urlpatterns = [
    url(r'^admin/', admin.site.urls),
    url(r'^index/', views.index),
    url(r'^pay_result/', views.pay_result),
    url(r'^update_order/', views.update_order),
]

# 支付相關配置
APPID = "申請下來的APPID "
# 如果支付成功，支付寶會向這個地址發送POST請求（校驗是否支付已經完成）
NOTIFY_URL = "http://xxx.xxx.xx.xx:xx/update_order/"
# 如果支付成功，重定向回到你的網站的地址。
RETURN_URL = "http://xxx.xxx.xx.xx:xxxx/pay_result/"
PRI_KEY_PATH = "keys/app_private_2048.txt"  # # 支付寶公鑰
PUB_KEY_PATH = "keys/alipay_public_2048.txt"  # 應用私鑰

文件名：alipay_public_2048.txt

注意秘鑰需要以
-----BEGIN PUBLIC KEY-----
支付寶公鑰
-----END PUBLIC KEY-----



文件名：app_private_2048.txt

-----BEGIN RSA PRIVATE KEY-----
應用私鑰
-----END RSA PRIVATE KEY-----

5、目錄結構：

6、運行中可能報的錯【Not a valid PEM post boundary】

 　　導致期中的一種原因為在生成應用公鑰與應用私鑰后使用的記事本打開的，未將記事本的自動換行關閉，導致存在不可見得換行符，故在使用記事本打開后請關閉掉自動換行。