535 lines
15 KiB
Go
535 lines
15 KiB
Go
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package payment
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import (
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"context"
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"errors"
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"fmt"
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"net/http"
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"sort"
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"strings"
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"time"
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"github.com/wechatpay-apiv3/wechatpay-go/core"
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"github.com/wechatpay-apiv3/wechatpay-go/core/auth/verifiers"
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"github.com/wechatpay-apiv3/wechatpay-go/core/downloader"
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"github.com/wechatpay-apiv3/wechatpay-go/core/notify"
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"github.com/wechatpay-apiv3/wechatpay-go/core/option"
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"github.com/wechatpay-apiv3/wechatpay-go/services/payments"
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"github.com/wechatpay-apiv3/wechatpay-go/services/payments/app"
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"github.com/wechatpay-apiv3/wechatpay-go/services/payments/h5"
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"github.com/wechatpay-apiv3/wechatpay-go/services/payments/jsapi"
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"github.com/wechatpay-apiv3/wechatpay-go/services/refunddomestic"
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"github.com/wechatpay-apiv3/wechatpay-go/utils"
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)
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const (
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TradeStateSuccess = "SUCCESS" // 支付成功
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TradeStateRefund = "REFUND" // 转入退款
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TradeStateNotPay = "NOTPAY" // 未支付
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TradeStateClosed = "CLOSED" // 已关闭
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TradeStateRevoked = "REVOKED" // 已撤销（付款码支付）
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TradeStateUserPaying = "USERPAYING" // 用户支付中（付款码支付）
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TradeStatePayError = "PAYERROR" // 支付失败（其他原因，如银行返回失败）
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)
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// WechatPayConfig 微信支付配置
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type WechatPayConfig struct {
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AppID string `json:"app_id"` // 应用ID
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MchID string `json:"mch_id"` // 商户号
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MchAPIv3Key string `json:"mch_api_v3_key"` // 商户APIv3密钥
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SerialNo string `json:"serial_no"` // 商户证书序列号
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PrivateKey string `json:"private_key"` // 商户私钥
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NotifyURL string `json:"notify_url"` // 支付通知地址
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RefundURL string `json:"refund_url"` // 退款通知地址
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}
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// WechatPayService 微信支付服务
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type WechatPayService struct {
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config WechatPayConfig
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client *core.Client
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jsapiService *jsapi.JsapiApiService
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}
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// NewWechatPayService 创建微信支付服务
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func NewWechatPayService(config *WechatPayConfig) (*WechatPayService, error) {
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if err := validateWechatPayConfig(config); err != nil {
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return nil, err
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}
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// 加载商户私钥
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privateKey, err := utils.LoadPrivateKey(config.PrivateKey)
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if err != nil {
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return nil, fmt.Errorf("加载商户私钥失败: %w", err)
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}
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// 创建微信支付客户端
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opts := []core.ClientOption{
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option.WithWechatPayAutoAuthCipher(config.MchID, config.SerialNo, privateKey, config.MchAPIv3Key),
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}
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client, err := core.NewClient(context.Background(), opts...)
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if err != nil {
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return nil, fmt.Errorf("创建微信支付客户端失败: %w", err)
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}
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// 下载并加载微信支付平台证书
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certDownloader, err := downloader.NewCertificateDownloader(context.Background(), config.MchID, privateKey, config.MchAPIv3Key, config.SerialNo)
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if err != nil {
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return nil, fmt.Errorf("创建证书下载器失败: %w", err)
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}
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if err := certDownloader.DownloadCertificates(context.Background()); err != nil {
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return nil, fmt.Errorf("下载微信支付平台证书失败: %w", err)
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}
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return &WechatPayService{
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config: *config,
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client: client,
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jsapiService: &jsapi.JsapiApiService{Client: client},
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}, nil
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}
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// CreateOrder 创建支付订单
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func (w *WechatPayService) CreateOrder(order *Order) (*OrderResult, error) {
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if err := validateCreateOrder(order); err != nil {
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return nil, err
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}
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switch order.Platform {
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case PlatformApp:
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return w.createAppOrder(order)
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case PlatformH5:
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return w.createH5Order(order)
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case PlatformMiniProg:
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return w.createJsapiOrder(order)
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default:
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return nil, errors.New("不支持的支付平台")
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}
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}
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// createAppOrder 创建APP支付订单
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func (w *WechatPayService) createAppOrder(order *Order) (*OrderResult, error) {
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svc := app.AppApiService{Client: w.client}
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amount := &app.Amount{
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Total: core.Int64(int64(order.Amount * 100)), // 转换为分
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Currency: core.String("CNY"),
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}
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req := app.PrepayRequest{
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Appid: core.String(w.config.AppID),
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Mchid: core.String(w.config.MchID),
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Description: core.String(order.Subject),
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OutTradeNo: core.String(order.OutTradeNo),
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NotifyUrl: core.String(w.config.NotifyURL),
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Amount: amount,
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}
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resp, _, err := svc.Prepay(context.Background(), req)
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if err != nil {
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return nil, fmt.Errorf("创建APP支付订单失败: %w", err)
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}
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// 生成支付参数
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params, err := w.generateAppPayParams(resp.PrepayId)
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if err != nil {
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return nil, err
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}
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return &OrderResult{
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OrderNo: order.OutTradeNo,
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PayParams: params,
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ExpireTime: time.Now().Add(30 * time.Minute),
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CreateTime: time.Now(),
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}, nil
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}
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// createH5Order 创建H5支付订单
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func (w *WechatPayService) createH5Order(order *Order) (*OrderResult, error) {
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svc := h5.H5ApiService{Client: w.client}
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amount := &h5.Amount{
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Total: core.Int64(int64(order.Amount * 100)), // 转换为分
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Currency: core.String("CNY"),
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}
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req := h5.PrepayRequest{
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Appid: core.String(w.config.AppID),
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Mchid: core.String(w.config.MchID),
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Description: core.String(order.Subject),
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OutTradeNo: core.String(order.OutTradeNo),
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NotifyUrl: core.String(w.config.NotifyURL),
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Amount: amount,
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SceneInfo: &h5.SceneInfo{
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PayerClientIp: core.String("127.0.0.1"), // TODO: 获取真实IP
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H5Info: &h5.H5Info{
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Type: core.String("Wap"),
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},
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},
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}
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resp, _, err := svc.Prepay(context.Background(), req)
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if err != nil {
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return nil, fmt.Errorf("创建H5支付订单失败: %w", err)
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}
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return &OrderResult{
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OrderNo: order.OutTradeNo,
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PayParams: resp.H5Url,
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ExpireTime: time.Now().Add(30 * time.Minute),
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CreateTime: time.Now(),
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}, nil
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}
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// createJsapiOrder 创建小程序支付订单
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func (w *WechatPayService) createJsapiOrder(order *Order) (*OrderResult, error) {
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if order.OpenID == "" {
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return nil, errors.New("小程序支付必须提供OpenID")
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}
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svc := jsapi.JsapiApiService{Client: w.client}
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amount := &jsapi.Amount{
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Total: core.Int64(int64(order.Amount * 100)), // 转换为分
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Currency: core.String("CNY"),
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}
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req := jsapi.PrepayRequest{
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Appid: core.String(w.config.AppID),
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Mchid: core.String(w.config.MchID),
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Description: core.String(order.Subject),
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OutTradeNo: core.String(order.OutTradeNo),
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NotifyUrl: core.String(w.config.NotifyURL),
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Amount: amount,
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Payer: &jsapi.Payer{
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Openid: core.String(order.OpenID),
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},
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}
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resp, _, err := svc.Prepay(context.Background(), req)
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if err != nil {
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return nil, fmt.Errorf("创建小程序支付订单失败: %w", err)
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}
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// 生成支付参数
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params, err := w.generateJsapiPayParams(resp.PrepayId)
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if err != nil {
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return nil, err
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}
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return &OrderResult{
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OrderNo: order.OutTradeNo,
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PayParams: params,
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ExpireTime: time.Now().Add(30 * time.Minute),
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CreateTime: time.Now(),
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}, nil
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}
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// Refund 申请退款
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func (w *WechatPayService) Refund(refund *Refund) (*RefundResult, error) {
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if err := validateRefund(refund); err != nil {
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return nil, err
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}
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svc := refunddomestic.RefundsApiService{Client: w.client}
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amount := &refunddomestic.AmountReq{
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Refund: core.Int64(int64(refund.RefundAmount * 100)), // 转换为分
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Total: core.Int64(int64(refund.TotalAmount * 100)), // 转换为分
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Currency: core.String("CNY"),
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}
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req := refunddomestic.CreateRequest{
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OutTradeNo: core.String(refund.OrderNo),
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OutRefundNo: core.String(refund.RefundNo),
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Reason: core.String(refund.Reason),
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NotifyUrl: core.String(refund.NotifyURL),
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Amount: amount,
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}
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resp, _, err := svc.Create(context.Background(), req)
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if err != nil {
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return nil, fmt.Errorf("申请退款失败: %w", err)
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}
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return &RefundResult{
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OrderNo: refund.OrderNo,
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RefundNo: refund.RefundNo,
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RefundID: *resp.RefundId,
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Status: string(*resp.Status),
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RefundTime: time.Now(),
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RefundAmount: refund.RefundAmount,
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}, nil
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}
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// QueryOrder 查询订单
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func (w *WechatPayService) QueryOrder(query *OrderQuery) (*OrderQueryResult, error) {
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if err := validateOrderQuery(query); err != nil {
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return nil, err
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}
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var resp *payments.Transaction
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var err error
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if query.TransactionID != "" {
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resp, _, err = w.jsapiService.QueryOrderById(context.Background(),
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jsapi.QueryOrderByIdRequest{
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TransactionId: core.String(query.TransactionID),
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})
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} else {
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resp, _, err = w.jsapiService.QueryOrderByOutTradeNo(context.Background(),
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jsapi.QueryOrderByOutTradeNoRequest{
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OutTradeNo: core.String(query.OrderNo),
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Mchid: core.String(w.config.MchID),
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})
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}
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if err != nil {
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return nil, fmt.Errorf("查询订单失败: %w", err)
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}
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// 转换支付状态
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status := convertWechatPayStatus(*resp.TradeState)
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// 解析支付时间
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payTime, _ := time.Parse(time.RFC3339, *resp.SuccessTime)
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return &OrderQueryResult{
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OrderNo: *resp.OutTradeNo,
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TransactionID: *resp.TransactionId,
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Status: status,
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Amount: float64(*resp.Amount.Total) / 100, // 转换为元
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PayTime: payTime,
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PayMethod: MethodWechat,
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Platform: getWechatPayPlatform(*resp.TradeType),
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}, nil
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}
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// HandlePaymentNotification 处理支付结果通知
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func (w *WechatPayService) HandlePaymentNotification(r *http.Request) (*OrderQueryResult, error) {
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// 初始化通知处理器
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handler := notify.NewNotifyHandler(w.config.MchAPIv3Key, verifiers.NewSHA256WithRSAVerifier(downloader.MgrInstance().GetCertificateVisitor(w.config.MchID)))
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// 解析通知数据
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transaction := new(payments.Transaction)
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notifyReq, err := handler.ParseNotifyRequest(context.Background(), r, transaction)
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if err != nil {
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return nil, fmt.Errorf("解析支付通知失败: %w", err)
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}
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// 验证通知数据
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if notifyReq.EventType != "TRANSACTION.SUCCESS" {
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return nil, errors.New("非支付成功通知")
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}
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// 转换支付状态
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status := convertWechatPayStatus(*transaction.TradeState)
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// 解析支付时间
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payTime, _ := time.Parse(time.RFC3339, *transaction.SuccessTime)
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return &OrderQueryResult{
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OrderNo: *transaction.OutTradeNo,
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TransactionID: *transaction.TransactionId,
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Status: status,
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Amount: float64(*transaction.Amount.Total) / 100, // 转换为元
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PayTime: payTime,
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PayMethod: MethodWechat,
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Platform: getWechatPayPlatform(*transaction.TradeType),
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}, nil
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}
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// 生成APP支付参数
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func (w *WechatPayService) generateAppPayParams(prepayID *string) (map[string]string, error) {
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if prepayID == nil {
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return nil, errors.New("预支付ID不能为空")
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}
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params := make(map[string]string)
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params["appid"] = w.config.AppID
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params["partnerid"] = w.config.MchID
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params["prepayid"] = *prepayID
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params["package"] = "Sign=WXPay"
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nonce, err := utils.GenerateNonce()
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if err != nil {
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|
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return nil, fmt.Errorf("生成随机字符串失败: %w", err)
|
||
|
|
}
|
||
|
|
params["noncestr"] = nonce
|
||
|
|
params["timestamp"] = fmt.Sprintf("%d", time.Now().Unix())
|
||
|
|
|
||
|
|
// 生成签名
|
||
|
|
sign, err := w.signParams(params)
|
||
|
|
if err != nil {
|
||
|
|
return nil, err
|
||
|
|
}
|
||
|
|
params["sign"] = sign
|
||
|
|
|
||
|
|
return params, nil
|
||
|
|
}
|
||
|
|
|
||
|
|
// 生成小程序支付参数
|
||
|
|
func (w *WechatPayService) generateJsapiPayParams(prepayID *string) (map[string]string, error) {
|
||
|
|
if prepayID == nil {
|
||
|
|
return nil, errors.New("预支付ID不能为空")
|
||
|
|
}
|
||
|
|
|
||
|
|
params := make(map[string]string)
|
||
|
|
params["appId"] = w.config.AppID
|
||
|
|
params["timeStamp"] = fmt.Sprintf("%d", time.Now().Unix())
|
||
|
|
nonce, err := utils.GenerateNonce()
|
||
|
|
if err != nil {
|
||
|
|
return nil, fmt.Errorf("生成随机字符串失败: %w", err)
|
||
|
|
}
|
||
|
|
params["nonceStr"] = nonce
|
||
|
|
params["package"] = "prepay_id=" + *prepayID
|
||
|
|
params["signType"] = "RSA"
|
||
|
|
|
||
|
|
// 生成签名
|
||
|
|
sign, err := w.signParams(params)
|
||
|
|
if err != nil {
|
||
|
|
return nil, err
|
||
|
|
}
|
||
|
|
params["paySign"] = sign
|
||
|
|
|
||
|
|
return params, nil
|
||
|
|
}
|
||
|
|
|
||
|
|
// 签名参数
|
||
|
|
func (w *WechatPayService) signParams(params map[string]string) (string, error) {
|
||
|
|
// 按字典序排序参数
|
||
|
|
var keys []string
|
||
|
|
for k := range params {
|
||
|
|
keys = append(keys, k)
|
||
|
|
}
|
||
|
|
sort.Strings(keys)
|
||
|
|
|
||
|
|
var pairs []string
|
||
|
|
for _, k := range keys {
|
||
|
|
pairs = append(pairs, fmt.Sprintf("%s=%s", k, params[k]))
|
||
|
|
}
|
||
|
|
message := strings.Join(pairs, "&")
|
||
|
|
|
||
|
|
// 使用商户私钥签名
|
||
|
|
privateKey, err := utils.LoadPrivateKey(w.config.PrivateKey)
|
||
|
|
if err != nil {
|
||
|
|
return "", fmt.Errorf("加载商户私钥失败: %w", err)
|
||
|
|
}
|
||
|
|
|
||
|
|
signature, err := utils.SignSHA256WithRSA(message, privateKey)
|
||
|
|
if err != nil {
|
||
|
|
return "", fmt.Errorf("签名失败: %w", err)
|
||
|
|
}
|
||
|
|
|
||
|
|
return signature, nil
|
||
|
|
}
|
||
|
|
|
||
|
|
// 转换微信支付状态
|
||
|
|
func convertWechatPayStatus(tradeState string) PaymentStatus {
|
||
|
|
switch tradeState {
|
||
|
|
case "SUCCESS":
|
||
|
|
return StatusSuccess
|
||
|
|
case "REFUND":
|
||
|
|
return StatusRefunded
|
||
|
|
case "NOTPAY":
|
||
|
|
return StatusPending
|
||
|
|
case "CLOSED":
|
||
|
|
return StatusClosed
|
||
|
|
case "PAYERROR":
|
||
|
|
return StatusFailed
|
||
|
|
default:
|
||
|
|
return StatusPending
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
// 获取微信支付平台
|
||
|
|
func getWechatPayPlatform(tradeType string) PaymentPlatform {
|
||
|
|
switch tradeType {
|
||
|
|
case "APP":
|
||
|
|
return PlatformApp
|
||
|
|
case "JSAPI":
|
||
|
|
return PlatformMiniProg
|
||
|
|
case "NATIVE", "MWEB":
|
||
|
|
return PlatformH5
|
||
|
|
default:
|
||
|
|
return PlatformApp
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
// 验证微信支付配置
|
||
|
|
func validateWechatPayConfig(config *WechatPayConfig) error {
|
||
|
|
if config == nil {
|
||
|
|
return errors.New("配置不能为空")
|
||
|
|
}
|
||
|
|
if config.AppID == "" {
|
||
|
|
return errors.New("应用ID不能为空")
|
||
|
|
}
|
||
|
|
if config.MchID == "" {
|
||
|
|
return errors.New("商户号不能为空")
|
||
|
|
}
|
||
|
|
if config.MchAPIv3Key == "" {
|
||
|
|
return errors.New("商户APIv3密钥不能为空")
|
||
|
|
}
|
||
|
|
if config.SerialNo == "" {
|
||
|
|
return errors.New("商户证书序列号不能为空")
|
||
|
|
}
|
||
|
|
if config.PrivateKey == "" {
|
||
|
|
return errors.New("商户私钥不能为空")
|
||
|
|
}
|
||
|
|
if config.NotifyURL == "" {
|
||
|
|
return errors.New("支付通知地址不能为空")
|
||
|
|
}
|
||
|
|
return nil
|
||
|
|
}
|
||
|
|
|
||
|
|
// 验证创建订单参数
|
||
|
|
func validateCreateOrder(order *Order) error {
|
||
|
|
if order == nil {
|
||
|
|
return errors.New("订单信息不能为空")
|
||
|
|
}
|
||
|
|
if order.OutTradeNo == "" {
|
||
|
|
return errors.New("商户订单号不能为空")
|
||
|
|
}
|
||
|
|
if order.Subject == "" {
|
||
|
|
return errors.New("商品描述不能为空")
|
||
|
|
}
|
||
|
|
if order.Amount <= 0 {
|
||
|
|
return errors.New("支付金额必须大于0")
|
||
|
|
}
|
||
|
|
if order.NotifyURL == "" {
|
||
|
|
return errors.New("通知地址不能为空")
|
||
|
|
}
|
||
|
|
return nil
|
||
|
|
}
|
||
|
|
|
||
|
|
// 验证退款参数
|
||
|
|
func validateRefund(refund *Refund) error {
|
||
|
|
if refund == nil {
|
||
|
|
return errors.New("退款信息不能为空")
|
||
|
|
}
|
||
|
|
if refund.OrderNo == "" {
|
||
|
|
return errors.New("商户订单号不能为空")
|
||
|
|
}
|
||
|
|
if refund.RefundNo == "" {
|
||
|
|
return errors.New("商户退款单号不能为空")
|
||
|
|
}
|
||
|
|
if refund.RefundAmount <= 0 {
|
||
|
|
return errors.New("退款金额必须大于0")
|
||
|
|
}
|
||
|
|
if refund.TotalAmount <= 0 {
|
||
|
|
return errors.New("订单总金额必须大于0")
|
||
|
|
}
|
||
|
|
if refund.RefundAmount > refund.TotalAmount {
|
||
|
|
return errors.New("退款金额不能大于订单总金额")
|
||
|
|
}
|
||
|
|
if refund.NotifyURL == "" {
|
||
|
|
return errors.New("退款通知地址不能为空")
|
||
|
|
}
|
||
|
|
return nil
|
||
|
|
}
|
||
|
|
|
||
|
|
// 验证订单查询参数
|
||
|
|
func validateOrderQuery(query *OrderQuery) error {
|
||
|
|
if query == nil {
|
||
|
|
return errors.New("查询参数不能为空")
|
||
|
|
}
|
||
|
|
if query.OrderNo == "" && query.TransactionID == "" {
|
||
|
|
return errors.New("商户订单号和交易号不能同时为空")
|
||
|
|
}
|
||
|
|
return nil
|
||
|
|
}
|
||
|
|
|
||
|
|
// GenerateOutTradeNo 生成商户订单号
|
||
|
|
func (w *WechatPayService) GenerateOutTradeNo() string {
|
||
|
|
return GenerateOrderNo(WechatPrefix)
|
||
|
|
}
|