76 lines
2.1 KiB
TypeScript
76 lines
2.1 KiB
TypeScript
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import crypto from "crypto"
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export interface AlipayConfig {
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appId: string
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partnerId: string
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key: string
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returnUrl: string
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notifyUrl: string
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}
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export class AlipayService {
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constructor(private config: AlipayConfig) {}
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// 创建支付宝订单
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createOrder(params: {
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outTradeNo: string
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subject: string
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totalAmount: number
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body?: string
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}) {
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const orderInfo = {
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app_id: this.config.appId,
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method: "alipay.trade.wap.pay",
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format: "JSON",
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charset: "utf-8",
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sign_type: "MD5",
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timestamp: new Date().toISOString().slice(0, 19).replace("T", " "),
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version: "1.0",
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notify_url: this.config.notifyUrl,
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return_url: this.config.returnUrl,
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biz_content: JSON.stringify({
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out_trade_no: params.outTradeNo,
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product_code: "QUICK_WAP_WAY",
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total_amount: params.totalAmount.toFixed(2),
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subject: params.subject,
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body: params.body || params.subject,
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}),
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}
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const sign = this.generateSign(orderInfo)
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return {
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...orderInfo,
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sign,
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paymentUrl: this.buildPaymentUrl(orderInfo, sign),
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}
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}
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// 生成签名
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generateSign(params: Record<string, string>): string {
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const sortedKeys = Object.keys(params).sort()
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const signString = sortedKeys
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.filter((key) => params[key] && key !== "sign")
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.map((key) => `${key}=${params[key]}`)
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.join("&")
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const signWithKey = `${signString}${this.config.key}`
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return crypto.createHash("md5").update(signWithKey, "utf8").digest("hex")
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}
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// 验证回调签名
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verifySign(params: Record<string, string>): boolean {
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const receivedSign = params.sign
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if (!receivedSign) return false
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const calculatedSign = this.generateSign(params)
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return receivedSign.toLowerCase() === calculatedSign.toLowerCase()
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}
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// 构建支付URL
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private buildPaymentUrl(params: Record<string, string>, sign: string): string {
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const gateway = "https://openapi.alipay.com/gateway.do"
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const queryParams = new URLSearchParams({ ...params, sign })
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return `${gateway}?${queryParams.toString()}`
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}
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}
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