refactor/checkout (#8)

Co-authored-by: matst80 <mats.tornberg@gmail.com>
Reviewed-on: #8
Co-authored-by: Mats Törnberg <mats@tornberg.me>
Co-committed-by: Mats Törnberg <mats@tornberg.me>

cmd/checkout/klarna-client.go

@@ -0,0 +1,142 @@
+package main
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+	"io"
+	"log"
+	"net/http"
+
+	"github.com/google/uuid"
+)
+
+type KlarnaClient struct {
+	Url      string
+	UserName string
+	Password string
+	client   *http.Client
+}
+
+func NewKlarnaClient(url, userName, password string) *KlarnaClient {
+	return &KlarnaClient{
+		Url:      url,
+		UserName: userName,
+		Password: password,
+		client:   &http.Client{},
+	}
+}
+
+const (
+	KlarnaPlaygroundUrl = "https://api.playground.klarna.com"
+)
+
+func (k *KlarnaClient) GetOrder(ctx context.Context, orderId string) (*CheckoutOrder, error) {
+	req, err := http.NewRequest("GET", k.Url+"/checkout/v3/orders/"+orderId, nil)
+	if err != nil {
+		return nil, err
+	}
+	spanCtx, span := tracer.Start(ctx, "Get klarna order")
+	defer span.End()
+	req = req.WithContext(spanCtx)
+	req.Header.Add("Content-Type", "application/json")
+	req.SetBasicAuth(k.UserName, k.Password)
+
+	res, err := k.client.Do(req)
+	if err != nil {
+		return nil, err
+	}
+	defer res.Body.Close()
+	return k.getOrderResponse(res)
+}
+
+func (k *KlarnaClient) getOrderResponse(res *http.Response) (*CheckoutOrder, error) {
+	var err error
+	var klarnaOrderResponse CheckoutOrder
+	if res.StatusCode >= 200 && res.StatusCode <= 299 {
+		err = json.NewDecoder(res.Body).Decode(&klarnaOrderResponse)
+		if err != nil {
+			return nil, err
+		}
+		return &klarnaOrderResponse, nil
+	}
+	body, err := io.ReadAll(res.Body)
+	if err == nil {
+		log.Println(string(body))
+	}
+
+	return nil, fmt.Errorf("%s", res.Status)
+}
+
+func (k *KlarnaClient) CreateOrder(ctx context.Context, reader io.Reader) (*CheckoutOrder, error) {
+	//bytes.NewReader(reply.Payload)
+	req, err := http.NewRequest("POST", k.Url+"/checkout/v3/orders", reader)
+	if err != nil {
+		return nil, err
+	}
+	spanCtx, span := tracer.Start(ctx, "Create klarna order")
+	defer span.End()
+	req = req.WithContext(spanCtx)
+	req.Header.Add("Content-Type", "application/json")
+	req.SetBasicAuth(k.UserName, k.Password)
+
+	res, err := http.DefaultClient.Do(req)
+	if nil != err {
+		return nil, err
+	}
+	defer res.Body.Close()
+	return k.getOrderResponse(res)
+}
+
+func (k *KlarnaClient) UpdateOrder(ctx context.Context, orderId string, reader io.Reader) (*CheckoutOrder, error) {
+	//bytes.NewReader(reply.Payload)
+	req, err := http.NewRequest("POST", fmt.Sprintf("%s/checkout/v3/orders/%s", k.Url, orderId), reader)
+	if err != nil {
+		return nil, err
+	}
+
+	spanCtx, span := tracer.Start(ctx, "Update klarna order")
+	defer span.End()
+	req = req.WithContext(spanCtx)
+	req.Header.Add("Content-Type", "application/json")
+	req.SetBasicAuth(k.UserName, k.Password)
+
+	res, err := http.DefaultClient.Do(req)
+	if nil != err {
+		return nil, err
+	}
+	defer res.Body.Close()
+	return k.getOrderResponse(res)
+}
+
+func (k *KlarnaClient) AbortOrder(ctx context.Context, orderId string) error {
+	req, err := http.NewRequest("POST", fmt.Sprintf("%s/checkout/v3/orders/%s/abort", k.Url, orderId), nil)
+	if err != nil {
+		return err
+	}
+	spanCtx, span := tracer.Start(ctx, "Abort klarna order")
+	defer span.End()
+	req = req.WithContext(spanCtx)
+	req.SetBasicAuth(k.UserName, k.Password)
+
+	_, err = http.DefaultClient.Do(req)
+	return err
+}
+
+// ordermanagement/v1/orders/{order_id}/acknowledge
+func (k *KlarnaClient) AcknowledgeOrder(ctx context.Context, orderId string) error {
+	req, err := http.NewRequest("POST", fmt.Sprintf("%s/ordermanagement/v1/orders/%s/acknowledge", k.Url, orderId), nil)
+	if err != nil {
+		return err
+	}
+	spanCtx, span := tracer.Start(ctx, "Acknowledge klarna order")
+	defer span.End()
+	req = req.WithContext(spanCtx)
+	id := uuid.New()
+
+	req.SetBasicAuth(k.UserName, k.Password)
+	req.Header.Add("Klarna-Idempotency-Key", id.String())
+
+	_, err = http.DefaultClient.Do(req)
+	return err
+}