split cart and checkout and checkout vs payments
This commit is contained in:
matst80
208
cmd/checkout/checkout_builder.go
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208
cmd/checkout/checkout_builder.go
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@@ -0,0 +1,208 @@
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package main
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import (
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"encoding/json"
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"fmt"
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"net/http"
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"git.k6n.net/go-cart-actor/pkg/cart"
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"git.k6n.net/go-cart-actor/pkg/checkout"
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adyenCheckout "github.com/adyen/adyen-go-api-library/v21/src/checkout"
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"github.com/adyen/adyen-go-api-library/v21/src/common"
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)
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// CheckoutMeta carries the external / URL metadata required to build a
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// Klarna CheckoutOrder from a CartGrain snapshot. It deliberately excludes
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// any Klarna-specific response fields (HTML snippet, client token, etc.).
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type CheckoutMeta struct {
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SiteUrl string
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// Terms string
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// Checkout string
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// Confirmation string
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ClientIp string
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Country string
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Currency string // optional override (defaults to "SEK" if empty)
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Locale string // optional override (defaults to "sv-se" if empty)
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}
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// BuildCheckoutOrderPayload converts the current cart grain + meta information
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// into a CheckoutOrder domain struct and returns its JSON-serialized payload
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// (to send to Klarna) alongside the structured CheckoutOrder object.
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//
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// This function is PURE: it does not perform any network I/O or mutate the
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// grain. The caller is responsible for:
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//
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// 1. Choosing whether to create or update the Klarna order.
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// 2. Invoking KlarnaClient.CreateOrder / UpdateOrder with the returned payload.
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// 3. Applying an InitializeCheckout mutation (or equivalent) with the
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// resulting Klarna order id + status.
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//
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// If you later need to support different tax rates per line, you can extend
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// CartItem / Delivery to expose that data and propagate it here.
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func BuildCheckoutOrderPayload(grain *checkout.CheckoutGrain, meta *CheckoutMeta) ([]byte, *CheckoutOrder, error) {
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if grain == nil {
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return nil, nil, fmt.Errorf("nil grain")
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}
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if meta == nil {
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return nil, nil, fmt.Errorf("nil checkout meta")
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}
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currency := meta.Currency
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if currency == "" {
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currency = "SEK"
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}
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locale := meta.Locale
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if locale == "" {
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locale = "sv-se"
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}
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country := meta.Country
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if country == "" {
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country = "SE" // sensible default; adjust if multi-country support changes
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}
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lines := make([]*Line, 0, len(grain.CartState.Items)+len(grain.Deliveries))
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// Item lines
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for _, it := range grain.CartState.Items {
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if it == nil {
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continue
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}
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lines = append(lines, &Line{
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Type: "physical",
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Reference: it.Sku,
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Name: it.Meta.Name,
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Quantity: int(it.Quantity),
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UnitPrice: int(it.Price.IncVat),
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TaxRate: it.Tax, // TODO: derive if variable tax rates are introduced
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QuantityUnit: "st",
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TotalAmount: int(it.TotalPrice.IncVat),
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TotalTaxAmount: int(it.TotalPrice.TotalVat()),
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ImageURL: fmt.Sprintf("https://www.elgiganten.se%s", it.Meta.Image),
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})
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}
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total := cart.NewPrice()
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total.Add(*grain.CartState.TotalPrice)
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// Delivery lines
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for _, d := range grain.Deliveries {
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if d == nil || d.Price.IncVat <= 0 {
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continue
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}
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//total.Add(d.Price)
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lines = append(lines, &Line{
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Type: "shipping_fee",
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Reference: d.Provider,
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Name: "Delivery",
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Quantity: 1,
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UnitPrice: int(d.Price.IncVat),
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TaxRate: 2500,
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QuantityUnit: "st",
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TotalAmount: int(d.Price.IncVat),
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TotalTaxAmount: int(d.Price.TotalVat()),
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})
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}
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order := &CheckoutOrder{
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PurchaseCountry: country,
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PurchaseCurrency: currency,
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Locale: locale,
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OrderAmount: int(total.IncVat),
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OrderTaxAmount: int(total.TotalVat()),
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OrderLines: lines,
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MerchantReference1: grain.Id.String(),
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MerchantURLS: &CheckoutMerchantURLS{
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Terms: fmt.Sprintf("%s/terms", meta.SiteUrl),
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Checkout: fmt.Sprintf("%s/checkout?order_id={checkout.order.id}", meta.SiteUrl),
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Confirmation: fmt.Sprintf("%s/confirmation/{checkout.order.id}", meta.SiteUrl),
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Notification: "https://cart.k6n.net/notification",
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Validation: "https://cart.k6n.net/validate",
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Push: "https://cart.k6n.net/push?order_id={checkout.order.id}",
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},
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}
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payload, err := json.Marshal(order)
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if err != nil {
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return nil, nil, fmt.Errorf("marshal checkout order: %w", err)
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}
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return payload, order, nil
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}
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func GetCheckoutMetaFromRequest(r *http.Request) *CheckoutMeta {
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host := getOriginalHost(r)
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country := getCountryFromHost(host)
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return &CheckoutMeta{
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ClientIp: getClientIp(r),
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SiteUrl: fmt.Sprintf("https://%s", host),
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Country: country,
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Currency: getCurrency(country),
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Locale: getLocale(country),
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}
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}
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func BuildAdyenCheckoutSession(grain *checkout.CheckoutGrain, meta *CheckoutMeta) (*adyenCheckout.CreateCheckoutSessionRequest, error) {
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if grain == nil {
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return nil, fmt.Errorf("nil grain")
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}
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if meta == nil {
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return nil, fmt.Errorf("nil checkout meta")
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}
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currency := meta.Currency
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if currency == "" {
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currency = "SEK"
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}
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country := meta.Country
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if country == "" {
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country = "SE"
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}
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lineItems := make([]adyenCheckout.LineItem, 0, len(grain.CartState.Items)+len(grain.Deliveries))
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// Item lines
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for _, it := range grain.CartState.Items {
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if it == nil {
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continue
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}
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lineItems = append(lineItems, adyenCheckout.LineItem{
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Quantity: common.PtrInt64(int64(it.Quantity)),
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AmountIncludingTax: common.PtrInt64(it.TotalPrice.IncVat),
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Description: common.PtrString(it.Meta.Name),
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AmountExcludingTax: common.PtrInt64(it.TotalPrice.ValueExVat()),
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TaxAmount: common.PtrInt64(it.TotalPrice.TotalVat()),
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TaxPercentage: common.PtrInt64(int64(it.Tax)),
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})
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}
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total := cart.NewPrice()
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total.Add(*grain.CartState.TotalPrice)
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// Delivery lines
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for _, d := range grain.Deliveries {
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if d == nil || d.Price.IncVat <= 0 {
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continue
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}
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lineItems = append(lineItems, adyenCheckout.LineItem{
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Quantity: common.PtrInt64(1),
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AmountIncludingTax: common.PtrInt64(d.Price.IncVat),
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Description: common.PtrString("Delivery"),
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AmountExcludingTax: common.PtrInt64(d.Price.ValueExVat()),
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TaxPercentage: common.PtrInt64(25),
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})
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}
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return &adyenCheckout.CreateCheckoutSessionRequest{
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Reference: grain.Id.String(),
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Amount: adyenCheckout.Amount{
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Value: total.IncVat,
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Currency: currency,
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},
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CountryCode: common.PtrString(country),
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MerchantAccount: "ElgigantenECOM",
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Channel: common.PtrString("Web"),
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ShopperIP: common.PtrString(meta.ClientIp),
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ReturnUrl: fmt.Sprintf("%s/adyen-return", meta.SiteUrl),
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LineItems: lineItems,
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}, nil
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}
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