Removed unnecessary redirect on WsPay initialization

main.go

@@ -371,21 +371,6 @@ func stripeHandlers(g *gin.RouterGroup, provider *database.PaymentEntryProvider,
 }
 
 func wsPayHandlers(g *gin.RouterGroup, provider *database.PaymentEntryProvider, wspayService *wspay2.Service) {
-	g.GET("/initialize/:id", func(c *gin.Context) {
-		entry, err := provider.FetchById(uuid.MustParse(c.Param("id")))
-		if err != nil {
-			c.AbortWithError(http.StatusNotFound, err)
-			return
-		}
-		if entry.State != state.StatePreinitialized {
-			c.AbortWithError(http.StatusBadRequest, err)
-			return
-		}
-		form := wspayService.InitializePayment(entry)
-
-		c.HTML(200, "wspay.gohtml", gin.H{"Action": wspay2.AuthorisationForm, "Form": form})
-	})
-
 	g.GET("success", func(c *gin.Context) {
 		url, err := wspayService.HandleSuccessResponse(c, provider)
 		if err != nil {

providers/wspay/service.go

@@ -6,6 +6,7 @@ import (
 	"encoding/hex"
 	"encoding/json"
 	"errors"
+	"fmt"
 	"github.com/gin-gonic/gin"
 	"github.com/google/uuid"
 	"io"
@@ -77,7 +78,11 @@ func determineState(response StatusCheckResponse) state.PaymentState {
 }
 
 func (s *Service) CreatePaymentUrl(entry database.PaymentEntry) (database.PaymentEntry, string, error) {
-	return entry, "/wspay/initialize/" + entry.Id.String(), nil
+	entry, url, err := s.InitializePayment(entry)
+	if err != nil {
+		return entry, "", err
+	}
+	return entry, url, nil
 }
 
 func (s *Service) CompleteTransaction(entry database.PaymentEntry, amount int64) (database.PaymentEntry, error) {
@@ -159,18 +164,42 @@ func (s *Service) CancelTransaction(entry database.PaymentEntry) (database.Payme
 	}
 }
 
-func (s *Service) InitializePayment(entry database.PaymentEntry) Form {
+func (s *Service) InitializePayment(entry database.PaymentEntry) (database.PaymentEntry, string, error) {
-	form := Form{
+	formattedAmount := fmt.Sprintf("%d,%02d", entry.TotalAmount/100, entry.TotalAmount%100)
+
+	var request = CreateTransaction{
 		ShopID:         s.ShopId,
-		ShoppingCartID: entry.Id.String(),
+		ShoppingCardID: entry.Id.String(),
 		Version:        "2.0",
-		TotalAmount:    entry.TotalAmount,
+		TotalAmount:    formattedAmount,
-		ReturnURL:      s.BackendUrl + "/wspay/success",
+		ReturnUrl:      s.BackendUrl + "/wspay/success",
-		ReturnErrorURL: s.BackendUrl + "/wspay/error",
+		ReturnErrorUrl: s.BackendUrl + "/wspay/error",
-		CancelURL:      s.BackendUrl + "/wspay/cancel",
+		CancelUrl:      s.BackendUrl + "/wspay/cancel",
 		Signature:      CalculateFormSignature(s.ShopId, s.ShopSecret, entry.Id.String(), entry.TotalAmount),
 	}
-	return form
+
+	httpResponse, err := createRequest(
+		"POST",
+		"https://formtest.wspay.biz/api/create-transaction",
+		map[string]string{"content-type": "application/json"},
+		toJson(request),
+	)
+	if err != nil {
+		return database.PaymentEntry{}, "", err
+	}
+
+	var response TransactionResponse
+	err = readResponse(httpResponse, &response)
+	if err != nil {
+		return database.PaymentEntry{}, "", err
+	}
+	if response.TransactionId == nil {
+		return database.PaymentEntry{}, "", errors.New("received bad response")
+	}
+
+	entry.State = state.StateInitialized
+
+	return entry, *response.PaymentFormUrl, nil
 }
 
 func (s *Service) HandleSuccessResponse(c *gin.Context, provider *database.PaymentEntryProvider) (string, error) {

providers/wspay/wspay.go

@@ -1,34 +1,19 @@
 package wspay
 
-const AuthorisationForm = "https://formtest.wspay.biz/authorization.aspx"
+type CreateTransaction struct {
+	ShopID         string `json:"ShopID"`
+	ShoppingCardID string `json:"ShoppingCartID"`
+	Version        string `json:"Version"`
+	TotalAmount    string `json:"TotalAmount"`
+	ReturnUrl      string `json:"ReturnURL"`
+	ReturnErrorUrl string `json:"ReturnErrorURL"`
+	CancelUrl      string `json:"CancelURL"`
+	Signature      string `json:"Signature"`
+}
 
-type Form struct {
+type TransactionResponse struct {
-	// required args
+	TransactionId  *string `json:"TransactionId"`
-	ShopID         string
+	PaymentFormUrl *string `json:"PaymentFormUrl"`
-	ShoppingCartID string
-	Version        string
-	TotalAmount    int64
-	ReturnURL      string
-	ReturnErrorURL string
-	CancelURL      string
-	Signature      string
-
-	// optional args
-	Lang              string
-	CustomerFirstName string
-	CustomerLastName  string
-	CustomerAddress   string
-	CustomerCity      string
-	CustomerZIP       string
-	CustomerCountry   string
-	CustomerPhone     string
-	PaymentPlan       string
-	CreditCardName    string
-	PaymentMethod     string
-	IntAmount         int64
-	IntCurrency       string
-	ReturnMethod      string
-	CurrencyCode      int
 }
 
 type FormReturn struct {

templates/wspay.gohtml

@@ -1,35 +0,0 @@
-<!doctype html>
-<html lang="en">
-<head>
-    <meta charset="UTF-8">
-    <meta name="viewport"
-          content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
-    <meta http-equiv="X-UA-Compatible" content="ie=edge">
-    <title>Izradi planćanje</title>
-    <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.3.0/dist/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-9ndCyUaIbzAi2FUVXJi0CjmCapSmO7SnpJef0486qhLnuZ2cdeRhO02iuK6FUUVM" crossorigin="anonymous">
-    <script src="https://cdn.jsdelivr.net/npm/bootstrap@5.3.0/dist/js/bootstrap.bundle.min.js" integrity="sha384-geWF76RCwLtnZ8qwWowPQNguL3RmwHVBC9FhGdlKrxdiJJigb/j/68SIy3Te4Bkz" crossorigin="anonymous"></script>
-    <style>
-        h2 {
-            margin-top: 16px;
-        }
-    </style>
-</head>
-<body class="container" style="margin-top: 32px">
-    <h2>Započni proces plaćanja</h2>
-
-    <form id="wspay-form" action="{{.Action}}" method="POST">
-        <input type="hidden" name="ShopID" value="{{.Form.ShopID}}">
-        <input type="hidden" name="ShoppingCartID" value="{{.Form.ShoppingCartID}}">
-        <input type="hidden" name="Version" value="{{.Form.Version}}">
-        <input type="hidden" name="TotalAmount" value="{{formatCurrency .Form.TotalAmount}}">
-        <input type="hidden" name="Signature" value="{{.Form.Signature}}">
-        <input type="hidden" name="ReturnURL" value="{{.Form.ReturnURL}}">
-        <input type="hidden" name="CancelURL" value="{{.Form.CancelURL}}">
-        <input type="hidden" name="ReturnErrorURL" value="{{.Form.ReturnErrorURL}}">
-    </form>
-
-    <script>
-        document.querySelector("#wspay-form").submit();
-    </script>
-</body>
-</html>