Getting more info abount transaction ad move js partial to js file

cmd/web/handlers.go

@@ -1,12 +1,15 @@
 package main
 
 import (
-	"myapp/internal/models"
+	"myapp/internal/cards"
 	"net/http"
+	"strconv"
+
+	"github.com/go-chi/chi/v5"
 )
 
 func (app *application) VirtualTerminal(w http.ResponseWriter, r *http.Request) {
-	if err := app.renderTemplate(w, r, "terminal", &templateData{}, "stripe-js"); err != nil {
+	if err := app.renderTemplate(w, r, "terminal", &templateData{}); err != nil {
 		app.errorLog.Println(err)
 	}
 }
@@ -26,6 +29,27 @@ func (app *application) PaymentSucceeded(w http.ResponseWriter, r *http.Request)
 	paymentAmount := r.Form.Get("payment_amount")
 	paymentCurrency := r.Form.Get("payment_currency")
 
+	card := cards.Card{
+		Secret: app.config.stripe.secret,
+		Key:    app.config.stripe.key,
+	}
+
+	pi, err := card.RetrievePaymentIntent(paymentIntent)
+	if err != nil {
+		app.errorLog.Println(err)
+		return
+	}
+
+	pm, err := card.GetPaymentMethod(paymentMethod)
+	if err != nil {
+		app.errorLog.Println(err)
+		return
+	}
+
+	lastFour := pm.Card.Last4
+	expiryMonth := pm.Card.ExpMonth
+	expiryYear := pm.Card.ExpYear
+
 	data := make(map[string]interface{})
 	data["cardholder"] = cardHolder
 	data["email"] = email
@@ -33,6 +57,10 @@ func (app *application) PaymentSucceeded(w http.ResponseWriter, r *http.Request)
 	data["pm"] = paymentMethod
 	data["pa"] = paymentAmount
 	data["pc"] = paymentCurrency
+	data["last_four"] = lastFour
+	data["expiry_month"] = expiryMonth
+	data["expiry_year"] = expiryYear
+	data["bank_return_code"] = pi.LatestCharge.ID
 
 	if err := app.renderTemplate(w, r, "succeeded", &templateData{
 		Data: data,
@@ -43,12 +71,12 @@ func (app *application) PaymentSucceeded(w http.ResponseWriter, r *http.Request)
 
 // ChargeOnce displays the page to buy one widget
 func (app *application) ChargeOnce(w http.ResponseWriter, r *http.Request) {
-	widget := models.Widget{
+	id := chi.URLParam(r, "id")
-		ID:             1,
+	widgetID, _ := strconv.Atoi(id)
-		Name:           "Custom Widget",
+
-		Description:    "Paris 2024",
+	widget, err := app.DB.GetWidget(widgetID)
-		InventoryLevel: 10,
+	if err != nil {
-		Price:          1000,
+		app.errorLog.Println(err)
 	}
 
 	data := make(map[string]interface{})
@@ -56,7 +84,7 @@ func (app *application) ChargeOnce(w http.ResponseWriter, r *http.Request) {
 
 	if err := app.renderTemplate(w, r, "buy-once", &templateData{
 		Data: data,
-	}, "stripe-js"); err != nil {
+	}); err != nil {
 		app.errorLog.Println(err)
 	}
 }

cmd/web/routes.go

@@ -11,7 +11,7 @@ func (app *application) routes() http.Handler {
 
 	mux.Get("/virtual-terminal", app.VirtualTerminal)
 	mux.Post("/payment-succeeded", app.PaymentSucceeded)
-	mux.Get("/charge-once", app.ChargeOnce)
+	mux.Get("/widget/{id}", app.ChargeOnce)
 
 	fileServer := http.FileServer(http.Dir("./static"))
 	mux.Handle("/static/*", http.StripPrefix("/static", fileServer))

cmd/web/templates/base.layout.gohtml

@@ -43,7 +43,7 @@
                                aria-expanded="false">Products</a>
                             <ul class="dropdown-menu">
                                 <li>
-                                    <a class="dropdown-item" href="/charge-once">Buy one widget</a>
+                                    <a class="dropdown-item" href="/widget/1">Buy one widget</a>
                                 </li>
                                 <li>
                                     <a class="dropdown-item" href="#">Subscription</a>

cmd/web/templates/buy-once.page.gohtml

@@ -1,4 +1,4 @@
-{{ template "base" .}}
+{{ template "base" . }}
 {{ define "title" }}
 Buy one widget
 {{ end }}
@@ -9,7 +9,6 @@ Buy one widget
 <img src="/static/img/widget.jpeg"
      alt="widget"
      class="image-fluid rounded mx-auto d-block">
-
 <div class="alert alert-danger text-center d-none" id="card-messages"></div>
 <form action="/payment-succeeded"
       method="post"
@@ -20,10 +19,9 @@ Buy one widget
       novalidate="">
     <input type="hidden" name="product_id" value="{{$widget.ID}}">
     <input type="hidden" id="amount" name="amount" value="{{$widget.Price}}">
-    <h3 class="mt-2 mb-3 text-center">{{$widget.Name}}: {{formatCurrency $widget.Price}}</h3>
+    <h3 class="mt-2 mb-3 text-center">{{$widget.Name}}: {{ formatCurrency $widget.Price }}</h3>
     <p class="mt-2 mb-3 text-center">{{$widget.Description}}</p>
     <hr>
-
     <div class="mb-3">
         <label for="cardholder-name" class="form-label">Cardholder Name</label>
         <input type="text"
@@ -53,7 +51,7 @@ Buy one widget
     <a href="javascript:void(0)"
        id="pay-button"
        class="btn btn-primary"
-       onclick="val()">Charge Card</a>
+       onclick="val({{.API}})">Charge Card</a>
     <div class="text-center d-none" id="processing-payment">
         <div class="spinner-border text-primary" role="status">
             <span class="visually-hidden">Loading...</span>
@@ -78,5 +76,7 @@ Buy one widget
 </form>
 {{ end }}
 {{ define "js" }}
-{{ template "stripe-js" . }}
+<script src="https://js.stripe.com/v3/"></script>
+<script src="/static/js/stripe.js"></script>
+<script>stripeInit('{{.StripePubKey}}');</script>
 {{ end }}

cmd/web/templates/stripe-js.partial.gohtml

@@ -1,136 +0,0 @@
-{{define "stripe-js"}}
-<script src="https://js.stripe.com/v3/"></script>
-<script>
-
-let card;
-let stripe;
-const cardMessages = document.getElementById("card-messages");
-const payButton = document.getElementById("pay-button");
-const processing = document.getElementById("processing-payment");
-
-stripe = Stripe('{{.StripePubKey}}');
-
-function hidePayButton() {
-    payButton.classList.add("d-none");
-    processing.classList.remove("d-none");
-}
-
-function showPayButton() {
-    payButton.classList.remove("d-none");
-    processing.classList.add("d-none");
-}
-
-function showCardError(msg) {
-    cardMessages.classList.add("alert-danger");
-    cardMessages.classList.remove("alert-success");
-    cardMessages.classList.remove("d-none");
-    cardMessages.innerText = msg;
-}
-
-function showCardSuccess() {
-    cardMessages.classList.add("alert-success");
-    cardMessages.classList.remove("alert-danger");
-    cardMessages.classList.remove("d-none");
-    cardMessages.innerText = "Trasaction successful";
-}
-
-function val() {
-    let form = document.getElementById("charge_form");
-
-    if (form.checkValidity() === false) {
-        this.event.preventDefault();
-        this.event.stopPropagation();
-        form.classList.add("was-validated");
-        return;
-    }
-    form.classList.add("was-validated");
-    hidePayButton();
-
-    let amountToCharge = String(parseFloat(document.getElementById("amount").value));
-    let payload = {
-        amount: amountToCharge,
-        currency: 'eur',
-    };
-
-    const requestOptions = {
-        method: 'post',
-        headers: {
-            'Accept': 'application/json',
-            'Content-Type': 'application/json',
-        },
-        body: JSON.stringify(payload),
-    };
-
-    fetch("{{.API}}/api/payment-intent", requestOptions)
-    .then(response => response.text())
-        .then(response => {
-            let data;
-            try {
-                data = JSON.parse(response);
-                stripe.confirmCardPayment(data.client_secret, {
-                    payment_method: {
-                        card: card,
-                        billing_details: {
-                            name: document.getElementById("cardholder-name").value,
-                        }
-                    }
-                }).then(function(result) {
-                        if (result.error) {
-                            // card declined, or sth went wrong with the card
-                            showCardError(result.error.message);
-                            showPayButton();
-                        } else if (result.paymentIntent) {
-                            if (result.paymentIntent.status === "succeeded") {
-                                // we have charged the card
-                                document.getElementById("payment_intent").value = result.paymentIntent.id;
-                                document.getElementById("payment_method").value = result.paymentIntent.payment_method_types[0];
-                                document.getElementById("payment_amount").value = result.paymentIntent.amount;
-                                document.getElementById("payment_currency").value = result.paymentIntent.currency;
-                                processing.classList.add("d-none");
-                                showCardSuccess();
-                                document.getElementById("charge_form").submit();
-                            }
-                        }
-                    })
-                console.log(data);
-
-            } catch (err) {
-                console.log(err);
-                showCardError("Invalid response from payment gateway!");
-                showPayButton();
-            }
-        });
-}
-
-(function () {
-    // create stripe & elements
-    const elements = stripe.elements();
-    const style = {
-        base: {
-            fontSize: '16px',
-            lineHeight: '24px',
-        }
-    };
-
-    // create card entry
-    card = elements.create('card', {
-        style:style,
-        hidePostalCode: true,
-    });
-    card.mount("#card-element");
-
-    // check for input errors
-    card.addEventListener('change', function(event) {
-        var displayError = document.getElementById("card-errors");
-        if (event.error) {
-            displayError.classList.remove('d-none');
-            displayError.textContent = event.error.message;
-        } else {
-            displayError.classList.add('d-none');
-            displayError.textContent = "";
-        }
-    });
-})();
-</script>
-
-{{end}}

cmd/web/templates/succeeded.page.gohtml

@@ -11,4 +11,7 @@ Payment Succedded!
 <p>Payment Method: {{ index .Data "pm" }}</p>
 <p>Payment Amount: {{ index .Data "pa" }}</p>
 <p>Currency: {{ index .Data "pc" }}</p>
+<p>Last Four: {{ index .Data "last_four" }}</p>
+<p>Bank Return Code: {{ index .Data "bank_return_code" }}</p>
+<p>Expiry Date: {{ index .Data "expiry_month" }}/{{index .Data "expiry_year"}}</p>
 {{ end }}

cmd/web/templates/terminal.page.gohtml

@@ -16,11 +16,12 @@ Virtual Terminal
     <div class="mb-3">
         <label for="amount" class="form-label">Amount</label>
         <input type="text"
-               id="amount"
+               id="charge_amount"
-               name="amount"
+               name="charge_amount"
-               autocomplete="amount-new"
+               autocomplete="charge_amount-new"
                required=""
                class="form-control">
+        <input type="hidden" id="amount" name="amount" value="value">
     </div>
     <div class="mb-3">
         <label for="cardholder-name" class="form-label">Cardholder Name</label>
@@ -51,7 +52,7 @@ Virtual Terminal
     <a href="javascript:void(0)"
        id="pay-button"
        class="btn btn-primary"
-       onclick="val()">Charge Card</a>
+       onclick="termVal()">Charge Card</a>
     <div class="text-center d-none" id="processing-payment">
         <div class="spinner-border text-primary" role="status">
             <span class="visually-hidden">Loading...</span>
@@ -76,5 +77,18 @@ Virtual Terminal
 </form>
 {{ end }}
 {{ define "js" }}
-{{ template "stripe-js" . }}
+<script src="https://js.stripe.com/v3/"></script>
+<script src="/static/js/stripe.js"></script>
+<script>
+    stripeInit('{{.StripePubKey}}');
+    function termVal() {
+        const chargeAmount = document.getElementById("charge_amount");
+        if (chargeAmount.value !== "") {
+            document.getElementById("amount").value = chargeAmount.value * 100;
+        } else {
+            document.getElementById("amount").value = 0;
+        }
+        val({{.API}});
+    }
+</script>
 {{ end }}

internal/cards/cards.go

@@ -3,6 +3,7 @@ package cards
 import (
 	"github.com/stripe/stripe-go/v79"
 	"github.com/stripe/stripe-go/v79/paymentintent"
+	"github.com/stripe/stripe-go/v79/paymentmethod"
 )
 
 type Card struct {
@@ -48,6 +49,28 @@ func (c *Card) CreatePaymentIntent(
 	return pi, "", nil
 }
 
+// GetPaymentMethod gets the payment method by payment intend id
+func (c *Card) GetPaymentMethod(s string) (*stripe.PaymentMethod, error) {
+	stripe.Key = c.Secret
+
+	pm, err := paymentmethod.Get(s, nil)
+	if err != nil {
+		return nil, err
+	}
+	return pm, nil
+}
+
+// RetrievePaymentMethod gets an existing payment intent by id
+func (c *Card) RetrievePaymentIntent(id string) (*stripe.PaymentIntent, error) {
+	stripe.Key = c.Secret
+
+	pi, err := paymentintent.Get(id, nil)
+	if err != nil {
+		return nil, err
+	}
+	return pi, nil
+}
+
 func cardErrorMessage(code stripe.ErrorCode) string {
 	msg := ""
 

internal/models/models.go

@@ -69,8 +69,8 @@ type Transaction struct {
 	Amount              int       `json:"amount"`
 	Currency            string    `json:"currency"`
 	LastFour            string    `json:"last_four"`
-	BankReturnCode      string    `json:bank_return_code`
+	BankReturnCode      string    `json:"bank_return_code"`
-	TransactionStatusID int       `json:transaction_status_id`
+	TransactionStatusID int       `json:"transaction_status_id"`
 	CreatedAt           time.Time `json:"-"`
 	UpdatedAt           time.Time `json:"-"`
 }
@@ -92,12 +92,81 @@ func (m *DBModel) GetWidget(id int) (Widget, error) {
 
 	var widget Widget
 
-	query := `SELECT id, name FROM widgets WHERE id = ?`
+	query := `SELECT id, name, description, inventory_level, price,
+                     coalesce(image, ''),
+                     created_at, updated_at
+              FROM widgets WHERE id = ?;`
 
 	row := m.DB.QueryRowContext(ctx, query, id)
-	err := row.Scan(&widget.ID, &widget.Name)
+	err := row.Scan(
+		&widget.ID,
+		&widget.Name,
+		&widget.Description,
+		&widget.InventoryLevel,
+		&widget.Price,
+		&widget.Image,
+		&widget.CreatedAt,
+		&widget.UpdatedAt,
+	)
 	if err != nil {
 		return widget, err
 	}
 	return widget, nil
 }
+
+// InsertTransaction inserts a new txn, and returns its id
+func (m *DBModel) InsertTransaction(txn Transaction) (int, error) {
+	ctx, cancel := context.WithTimeout(context.Background(), 3*time.Second)
+	defer cancel()
+
+	stmt := `INSERT INTO transactions
+             (amount, currency, last_four, bank_return_code,
+             transaction_status_id, created_at, updated_at)
+             VALUES (?, ?, ?, ?, ?, ?, ?)`
+
+	result, err := m.DB.ExecContext(ctx, stmt,
+		txn.Amount,
+		txn.Currency,
+		txn.LastFour,
+		txn.BankReturnCode,
+		txn.TransactionStatusID,
+		time.Now(),
+		time.Now(),
+	)
+	if err != nil {
+		return 0, err
+	}
+	id, err := result.LastInsertId()
+	if err != nil {
+		return 0, err
+	}
+	return int(id), nil
+}
+
+// InsertOrder inserts a new order, and returns its id
+func (m *DBModel) InsertOrder(order Order) (int, error) {
+	ctx, cancel := context.WithTimeout(context.Background(), 3*time.Second)
+	defer cancel()
+
+	stmt := `INSERT INTO orders
+             (widget_id, transaction_id, status_id, quantity,
+             amount, created_at, updated_at)
+             VALUES (?, ?, ?, ?, ?, ?, ?)`
+
+	result, err := m.DB.ExecContext(ctx, stmt,
+		order.WidgetID,
+		order.TransactionID,
+		order.StatusID,
+		order.Quantity,
+		order.Amount,
+		time.Now(),
+	)
+	if err != nil {
+		return 0, err
+	}
+	id, err := result.LastInsertId()
+	if err != nil {
+		return 0, err
+	}
+	return int(id), nil
+}

static/js/stripe.js

@@ -4,8 +4,6 @@ const cardMessages = document.getElementById("card-messages");
 const payButton = document.getElementById("pay-button");
 const processing = document.getElementById("processing-payment");
 
-stripe = Stripe('{{.StripePubKey}}');
-
 function hidePayButton() {
     payButton.classList.add("d-none");
     processing.classList.remove("d-none");
@@ -30,7 +28,7 @@ function showCardSuccess() {
     cardMessages.innerText = "Trasaction successful";
 }
 
-function val(stripe) {
+function val(api) {
     let form = document.getElementById("charge_form");
 
     if (form.checkValidity() === false) {
@@ -42,7 +40,8 @@ function val(stripe) {
     form.classList.add("was-validated");
     hidePayButton();
 
-    let amountToCharge = String(parseFloat(document.getElementById("amount").value));
+    let amountToCharge = document.getElementById("amount").value;
+    console.log(amountToCharge);
     let payload = {
         amount: amountToCharge,
         currency: 'eur',
@@ -57,7 +56,7 @@ function val(stripe) {
         body: JSON.stringify(payload),
     };
 
-    fetch("{{.API}}/api/payment-intent", requestOptions)
+    fetch(api + "/api/payment-intent", requestOptions)
     .then(response => response.text())
         .then(response => {
             let data;
@@ -79,7 +78,7 @@ function val(stripe) {
                             if (result.paymentIntent.status === "succeeded") {
                                 // we have charged the card
                                 document.getElementById("payment_intent").value = result.paymentIntent.id;
-                                document.getElementById("payment_method").value = result.paymentIntent.payment_method_types[0];
+                                document.getElementById("payment_method").value = result.paymentIntent.payment_method;
                                 document.getElementById("payment_amount").value = result.paymentIntent.amount;
                                 document.getElementById("payment_currency").value = result.paymentIntent.currency;
                                 processing.classList.add("d-none");
@@ -98,7 +97,10 @@ function val(stripe) {
         });
 }
 
-(function () {
+function stripeInit(pubKey) {
+    stripe = Stripe(pubKey);
+
+    (function () {
         // create stripe & elements
         const elements = stripe.elements();
         const style = {
@@ -126,4 +128,5 @@ function val(stripe) {
                 displayError.textContent = "";
             }
         });
-})();
+    })();
+}