passing key using form

cmd/api/handlers-api.go

@@ -2,7 +2,9 @@ package main
 
 import (
 	"encoding/json"
+	"myapp/internal/cards"
 	"net/http"
+	"strconv"
 )
 
 type stripePayload struct {
@@ -12,21 +14,54 @@ type stripePayload struct {
 
 type jsonResponse struct {
 	OK      bool   `json:"ok"`
-	Message string `json:"message"`
+	Message string `json:"message,omitempty"`
-	Content string `json:"content"`
+	Content string `json:"content,omitempty"`
-	ID      int    `json:"id"`
+	ID      int    `json:"id,omitempty"`
 }
 
 func (app *application) GetPaymentIntent(w http.ResponseWriter, r *http.Request) {
+	var payload stripePayload
+
+	err := json.NewDecoder(r.Body).Decode(&payload)
+	if err != nil {
+		app.errorLog.Println(err)
+		return // TODO: return a valid json
+	}
+
+	amount, err := strconv.Atoi(payload.Amount)
+	if err != nil {
+		app.errorLog.Println(err)
+		return // TODO: return a valid json
+	}
+
+	card := cards.Card{
+		Secret:   app.config.stripe.secret,
+		Key:      app.config.stripe.key,
+		Currency: payload.Currency,
+	}
+
+	pi, msg, err := card.Charge(payload.Currency, amount)
+	if err != nil {
 		j := jsonResponse{
-		OK: true,
+			OK:      false,
+			Message: msg,
+			Content: "",
 		}
 
 		out, err := json.MarshalIndent(j, "", "    ")
 		if err != nil {
 			app.errorLog.Println(err)
 		}
+		w.Header().Set("Content-Type", "application/json")
+		w.Write(out)
+		return
+	}
 
+	out, err := json.MarshalIndent(pi, "", "    ")
+	if err != nil {
+		app.errorLog.Println(err)
+		return // TODO: return a valid json
+	}
 	w.Header().Set("Content-Type", "application/json")
 	w.Write(out)
 }

cmd/api/routes-api.go

@@ -18,6 +18,6 @@ func (app *application) routes() http.Handler {
 		MaxAge:           300,
 	}))
 
-	mux.Get("/api/payment-intent", app.GetPaymentIntent)
+	mux.Post("/api/payment-intent", app.GetPaymentIntent)
 	return mux
 }

cmd/web/handlers.go

@@ -5,7 +5,41 @@ import (
 )
 
 func (app *application) VirtualTerminal(w http.ResponseWriter, r *http.Request) {
-	if err := app.renderTemplate(w, r, "terminal", nil); err != nil {
+	stringMap := make(map[string]string)
+	stringMap["publishable_key"] = app.config.stripe.key
+	if err := app.renderTemplate(w, r, "terminal", &templateData{
+		StringMap: stringMap,
+	}); err != nil {
+		app.errorLog.Println(err)
+	}
+}
+
+func (app *application) PaymentSucceeded(w http.ResponseWriter, r *http.Request) {
+	err := r.ParseForm()
+	if err != nil {
+		app.errorLog.Println(err)
+		return
+	}
+
+	// read posted data
+	cardHolder := r.Form.Get("cardholder_name")
+	email := r.Form.Get("cardholder_email")
+	paymentIntent := r.Form.Get("payment_intent")
+	paymentMethod := r.Form.Get("payment_method")
+	paymentAmount := r.Form.Get("payment_amount")
+	paymentCurrency := r.Form.Get("payment_currency")
+
+	data := make(map[string]interface{})
+	data["cardholder"] = cardHolder
+	data["email"] = email
+	data["pi"] = paymentIntent
+	data["pm"] = paymentMethod
+	data["pa"] = paymentAmount
+	data["pc"] = paymentCurrency
+
+	if err := app.renderTemplate(w, r, "succeeded", &templateData{
+		Data: data,
+	}); err != nil {
 		app.errorLog.Println(err)
 	}
 }

cmd/web/render.go

@@ -28,7 +28,8 @@ var functions = template.FuncMap{}
 var templateFS embed.FS
 
 func (app *application) addDefaultData(td *templateData, r *http.Request) *templateData {
-	return nil
+	td.API = app.config.api
+	return td
 }
 
 func (app *application) renderTemplate(

cmd/web/routes.go

@@ -10,6 +10,7 @@ func (app *application) routes() http.Handler {
 	mux := chi.NewRouter()
 
 	mux.Get("/virtual-terminal", app.VirtualTerminal)
+	mux.Post("/payment-succeeded", app.PaymentSucceeded)
 
 	return mux
 }

cmd/web/templates/succeeded.page.gohtml

@@ -0,0 +1,14 @@
+{{ template "base" . }}
+{{ define "title" }}
+Payment Succedded!
+{{ end }}
+{{ define "content" }}
+<h2 class="mt-5">Payment Succeeded</h2>
+<hr>
+<p>Payment Intent: {{ index .Data "pi" }}</p>
+<p>Cardholder: {{ index .Data "cardholder" }}</p>
+<p>Email: {{ index .Data "email" }}</p>
+<p>Payment Method: {{ index .Data "pm" }}</p>
+<p>Payment Amount: {{ index .Data "pa" }}</p>
+<p>Currency: {{ index .Data "pc" }}</p>
+{{ end }}

cmd/web/templates/terminal.page.gohtml

@@ -6,7 +6,7 @@ Virtual Terminal
 <h2 class="mt-3 text-center">Virtual Terminal</h2>
 <hr>
 <div class="alert alert-danger text-center d-none" id="card-messages"></div>
-<form action="/payment-succecded"
+<form action="/payment-succeeded"
       method="post"
       name="charge_form"
       id="charge_form"
@@ -57,6 +57,12 @@ Virtual Terminal
             <span class="visually-hidden">Loading...</span>
         </div>
     </div>
+
+    <input id="payment_intent" type="hidden" name="payment_intent" value="payment_intent">
+    <input id="payment_method" type="hidden" name="payment_method" value="payment_method">
+    <input id="payment_amount" type="hidden" name="payment_amount" value="payment_amount">
+    <input id="payment_currency" type="hidden" name="payment_currency" value="payment_currency">
+
 </form>
 {{ end }}
 {{ define "js" }}
@@ -69,13 +75,32 @@ const cardMessages = document.getElementById("card-messages");
 const payButton = document.getElementById("pay-button");
 const processing = document.getElementById("processing-payment");
 
-stripe = Stripe(''); // TODO: Publish key to be added
+stripe = Stripe('{{index .StringMap "publishable_key"}}');
 
 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");
 
@@ -87,6 +112,61 @@ function val() {
     }
     form.classList.add("was-validated");
     hidePayButton();
+
+    let amountToCharge = String(parseFloat(document.getElementById("amount").value) * 100);
+    let payload = {
+        amount: amountToCharge,
+        currency: 'eur',
+    };
+
+    const requestOptions = {
+        method: 'post',
+        headers: {
+            'Accept': 'application/json',
+            'Content-Type': 'application/json',
+        },
+        body: JSON.stringify(payload),
+    };
+
+    fetch("{{index .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 () {