Getting the paymentIntent set up route and handler in API

cmd/api/api.go

@@ -0,0 +1,89 @@
+package main
+
+import (
+	"flag"
+	"fmt"
+	"log"
+	"net/http"
+	"os"
+	"time"
+)
+
+const (
+	version = "1.0.0"
+)
+
+type config struct {
+	port int
+	env  string
+	db   struct {
+		dsn string
+	}
+	stripe struct {
+		secret string
+		key    string
+	}
+}
+
+type application struct {
+	config   config
+	infolog  *log.Logger
+	errorLog *log.Logger
+	version  string
+}
+
+func (app *application) serve() error {
+	srv := &http.Server{
+		Addr:              fmt.Sprintf(":%d", app.config.port),
+		Handler:           app.routes(),
+		IdleTimeout:       30 * time.Second,
+		ReadTimeout:       10 * time.Second,
+		ReadHeaderTimeout: 5 * time.Second,
+		WriteTimeout:      5 * time.Second,
+	}
+
+	app.infolog.Printf(
+		"Starting Backend server in %s mode on port %d",
+		app.config.env,
+		app.config.port,
+	)
+	return srv.ListenAndServe()
+}
+
+func main() {
+	var cfg config
+
+	flag.IntVar(&cfg.port, "port", 4001, "Server port to listen on")
+	flag.StringVar(
+		&cfg.env,
+		"env",
+		"development",
+		"Application environment {development|production|maintenance}",
+	)
+	flag.StringVar(
+		&cfg.db.dsn,
+		"dsn",
+		"root@tcp(localhost:6379)/widgets?parseTime=true&tls=false",
+		"Application environment {development|production}",
+	)
+
+	flag.Parse()
+
+	cfg.stripe.key = os.Getenv("STRIPE_KEY")
+	cfg.stripe.secret = os.Getenv("STRIPE_SECRET")
+
+	infoLog := log.New(os.Stdout, "INFO\t", log.Ldate|log.Ltime)
+	errorLog := log.New(os.Stdout, "ERROR\t", log.Ldate|log.Ltime|log.Lshortfile)
+
+	app := &application{
+		version:  version,
+		config:   cfg,
+		infolog:  infoLog,
+		errorLog: errorLog,
+	}
+
+	err := app.serve()
+	if err != nil {
+		log.Fatal(err)
+	}
+}

cmd/api/handlers-api.go

@@ -0,0 +1,32 @@
+package main
+
+import (
+	"encoding/json"
+	"net/http"
+)
+
+type stripePayload struct {
+	Currency string `json:"currency"`
+	Amount   string `json:"amount"`
+}
+
+type jsonResponse struct {
+	OK      bool   `json:"ok"`
+	Message string `json:"message"`
+	Content string `json:"content"`
+	ID      int    `json:"id"`
+}
+
+func (app *application) GetPaymentIntent(w http.ResponseWriter, r *http.Request) {
+	j := jsonResponse{
+		OK: true,
+	}
+
+	out, err := json.MarshalIndent(j, "", "    ")
+	if err != nil {
+		app.errorLog.Println(err)
+	}
+
+	w.Header().Set("Content-Type", "application/json")
+	w.Write(out)
+}

cmd/api/routes-api.go

@@ -0,0 +1,23 @@
+package main
+
+import (
+	"net/http"
+
+	"github.com/go-chi/chi/v5"
+	"github.com/go-chi/cors"
+)
+
+func (app *application) routes() http.Handler {
+	mux := chi.NewRouter()
+
+	mux.Use(cors.Handler(cors.Options{
+		AllowedOrigins:   []string{"https://*", "http://*"},
+		AllowedMethods:   []string{"GET", "POST", "PUT", "DELETE", "OPTIONS"},
+		AllowedHeaders:   []string{"Accept", "Authorization", "Content-Type", "X-CSRF-Token"},
+		AllowCredentials: false,
+		MaxAge:           300,
+	}))
+
+	mux.Get("/api/payment-intent", app.GetPaymentIntent)
+	return mux
+}

go.mod

@@ -2,4 +2,8 @@ module myapp
 
 go 1.22.5
 
-require github.com/go-chi/chi/v5 v5.1.0
+require (
+	github.com/go-chi/chi/v5 v5.1.0
+	github.com/go-chi/cors v1.2.1
+	github.com/stripe/stripe-go/v79 v79.6.0
+)

go.sum

@@ -1,2 +1,24 @@
+github.com/davecgh/go-spew v1.1.0 h1:ZDRjVQ15GmhC3fiQ8ni8+OwkZQO4DARzQgrnXU1Liz8=
+github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/go-chi/chi/v5 v5.1.0 h1:acVI1TYaD+hhedDJ3r54HyA6sExp3HfXq7QWEEY/xMw=
 github.com/go-chi/chi/v5 v5.1.0/go.mod h1:DslCQbL2OYiznFReuXYUmQ2hGd1aDpCnlMNITLSKoi8=
+github.com/go-chi/cors v1.2.1 h1:xEC8UT3Rlp2QuWNEr4Fs/c2EAGVKBwy/1vHx3bppil4=
+github.com/go-chi/cors v1.2.1/go.mod h1:sSbTewc+6wYHBBCW7ytsFSn836hqM7JxpglAy2Vzc58=
+github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
+github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
+github.com/stretchr/testify v1.7.0 h1:nwc3DEeHmmLAfoZucVR881uASk0Mfjw8xYJ99tb5CcY=
+github.com/stretchr/testify v1.7.0/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
+github.com/stripe/stripe-go/v79 v79.6.0 h1:qSBV2f2rpLEEZTdTlVLzdmQJZNmfoo2E3hUEkFT8GBc=
+github.com/stripe/stripe-go/v79 v79.6.0/go.mod h1:cuH6X0zC8peY6f1AubHwgJ/fJSn2dh5pfiCr6CjyKVU=
+golang.org/x/net v0.0.0-20210520170846-37e1c6afe023 h1:ADo5wSpq2gqaCGQWzk7S5vd//0iyyLeAratkEoG5dLE=
+golang.org/x/net v0.0.0-20210520170846-37e1c6afe023/go.mod h1:9nx3DQGgdP8bBQD5qxJ1jj9UTztislL4KSBs9R2vV5Y=
+golang.org/x/sys v0.0.0-20201119102817-f84b799fce68/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20210423082822-04245dca01da/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=
+golang.org/x/text v0.3.6 h1:aRYxNxv6iGQlyVaZmk6ZgYEDa+Jg18DxebPSrd6bg1M=
+golang.org/x/text v0.3.6/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
+golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c h1:dUUwHk2QECo/6vqA44rthZ8ie2QXMNeKRTHCNY2nXvo=
+gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

internal/card/card.go

@@ -0,0 +1,75 @@
+package card
+
+import (
+	"github.com/stripe/stripe-go/v79"
+	"github.com/stripe/stripe-go/v79/paymentintent"
+)
+
+type Card struct {
+	Secret   string
+	Key      string
+	Currency string
+}
+
+type Transaction struct {
+	TransactionStatusID int
+	Amount              int
+	Currency            string
+	LastFour            string
+	BankReturnCode      string
+}
+
+func (c *Card) Charge(currency string, amount int) (*stripe.PaymentIntent, string, error) {
+	return c.CreatePaymentIntent(currency, amount)
+}
+
+func (c *Card) CreatePaymentIntent(
+	currency string,
+	amount int,
+) (*stripe.PaymentIntent, string, error) {
+	stripe.Key = c.Secret
+
+	// create a payment intent
+	params := &stripe.PaymentIntentParams{
+		Amount:   stripe.Int64(int64(amount)),
+		Currency: stripe.String(currency),
+	}
+
+	// params.AddMetadata("key", "value")
+
+	pi, err := paymentintent.New(params)
+	if err != nil {
+		msg := ""
+		if stripeErr, ok := err.(*stripe.Error); ok {
+			msg = cardErrorMessage(stripeErr.Code)
+		}
+		return nil, msg, err
+	}
+	return pi, "", nil
+}
+
+func cardErrorMessage(code stripe.ErrorCode) string {
+	msg := ""
+
+	switch code {
+	case stripe.ErrorCodeCardDeclined:
+		msg = "Your card was declined"
+	case stripe.ErrorCodeExpiredCard:
+		msg = "Your card is expired"
+	case stripe.ErrorCodeIncorrectCVC:
+		msg = "Incorrect CVC code"
+	case stripe.ErrorCodeIncorrectZip:
+		msg = "Incorrect zip/postal code"
+	case stripe.ErrorCodeAmountTooLarge:
+		msg = "The amount is too large to charge to your card"
+	case stripe.ErrorCodeAmountTooSmall:
+		msg = "The amount is too small to charge to your card"
+	case stripe.ErrorCodeBalanceInsufficient:
+		msg = "Insufficient balance"
+	case stripe.ErrorCodePostalCodeInvalid:
+		msg = "Incorrect zip/postal code"
+	default:
+		msg = "Your card was declined"
+	}
+	return msg
+}