update router for support epay GET and POST

src/route/router.go

@@ -75,25 +75,20 @@ func RegisterRoute(e *echo.Echo) {
 
 	// epay v1 routes
 	epayV1 := paymentRoute.Group("/epay/v1")
-	epayV1.GET("/order/create-transaction/submit.php", func(ctx echo.Context) error {
+	epayV1.Match([]string{http.MethodPost, http.MethodGet}, "/order/create-transaction/submit.php", func(ctx echo.Context) error {
-		money := ctx.QueryParam("money")
+		params := make(map[string]interface{})
-		name := ctx.QueryParam("name")
+		for k, v := range ctx.QueryParams() {
-		notifyURL := ctx.QueryParam("notify_url")
+			params[k] = v[0]
-		outTradeNo := ctx.QueryParam("out_trade_no")
-		returnURL := ctx.QueryParam("return_url")
-		signstr := ctx.QueryParam("sign")
-		// signType := ctx.QueryParam("sign_type")
-
-		m := map[string]interface{}{
-			"money":        money,
-			"name":         name,
-			"notify_url":   notifyURL,
-			"out_trade_no": outTradeNo,
-			"pid":          config.GetEpayPid(), // 注意：验签时需要包含 pid 参数
-			"return_url":   returnURL,
 		}
 
-		checkSignature, err := sign.Get(m, config.GetApiAuthToken())
+		signstr := params["sign"].(string)
+		delete(params, "sign")
+		delete(params, "sign_type")
+
+		// we need to add pid to params for signature verification
+		params["pid"] = config.GetEpayPid()
+
+		checkSignature, err := sign.Get(params, config.GetApiAuthToken())
 		if err != nil {
 			return constant.SignatureErr
 		}
@@ -101,6 +96,25 @@ func RegisterRoute(e *echo.Echo) {
 			return constant.SignatureErr
 		}
 
+		// safely get string value from map
+		getString := func(m map[string]interface{}, key string) string {
+			v, ok := m[key]
+			if !ok {
+				return ""
+			}
+			s, ok := v.(string)
+			if !ok {
+				return ""
+			}
+			return s
+		}
+
+		money := getString(params, "money")
+		name := getString(params, "name")
+		notifyURL := getString(params, "notify_url")
+		outTradeNo := getString(params, "out_trade_no")
+		returnURL := getString(params, "return_url")
+
 		amountFloat, err := strconv.ParseFloat(money, 64)
 		if err != nil {
 			return comm.Ctrl.FailJson(ctx, fmt.Errorf("invalid money value: %s", money))