feat: configure webhook

README.md

@@ -38,6 +38,9 @@ The application uses the following environment variables:
     MAIL_USER, MAIL_PASSWORD, MAIL_HOST, MAIL_PORT, MAIL_FROM, MAIL_TEMPLATES_DIR: Configuration for the mail service.
 ```    
 
+### Webhook configuration
+If you want some http endpoint to be called by **POST** you have to set up `WEBHOOK_URL` as environment variable with absolute URL of your endpoint. After payment is completed by client, order will be send through http `POST`.
+
 ## Dependencies
 
 The application uses several external packages:

cmd/http/server/main.go

@@ -80,7 +80,6 @@ func main() {
 
 	<-ctx.Done()
 
-	log.Println("on shutdown")
 	if restServer != nil {
 		if err := restServer.Shutdown(); err != nil {
 			panic(fmt.Errorf("restServer.Shutdown: %w", err))

internal/api/server.go

@@ -108,6 +108,15 @@ func (s *RestServer) onNotification(ctx context.Context, notifChan chan domain.N
 			continue
 		}
 
+		// notify
+		if s.config.WebhookUrl != "" {
+			go func() {
+				if err := s.orderSrv.Webhook(ctx, s.config.WebhookUrl, order); err != nil {
+					log.Println("orderSrv.Webhook:", err)
+				}
+			}()
+		}
+
 		// Send email to client and provider
 		if err := s.mailSrv.SendProviderConfirm(mail.SendOK{
 			Tx:          order.Tx,

internal/domain/order.go

@@ -7,10 +7,10 @@ import (
 )
 
 type Order struct {
-	ID        primitive.ObjectID `bson:"_id" json:"_id"`
+	ID        primitive.ObjectID `bson:"_id" json:"-"`
-	OrderID   string             `json:"order_id"`
+	OrderID   string             `bson:"order_id" json:"order_id"`
-	ClientID  string             `json:"client_id"`
+	ClientID  string             `bson:"client_id" json:"client_id"`
-	Email     string             `json:"email"`
+	Email     string             `bson:"email" json:"email"`
 	Amount    float64            `bson:"amount" json:"amount"`
 	Tx        string             `bson:"tx" json:"tx"`
 	Block     string             `bson:"block" json:"block"`

internal/services/btc/btc.go

@@ -2,7 +2,6 @@ package btc
 
 import (
 	"fmt"
-	"net/http"
 )
 
 type BitcoinService struct {
@@ -10,7 +9,6 @@ type BitcoinService struct {
 	auth          string
 	zmqAddress    string
 	walletAddress string
-	client        *http.Client
 	testNet       bool
 }
 
@@ -20,7 +18,6 @@ func NewBitcoinService(host, auth, zmqAddress, walletAddress string) *BitcoinSer
 		auth:          auth,
 		zmqAddress:    zmqAddress,
 		walletAddress: walletAddress,
-		client:        &http.Client{},
 	}
 
 	from, err := bs.getAddressGroupings(false)

internal/services/order.go

@@ -1,7 +1,13 @@
 package services
 
 import (
+	"bytes"
 	"context"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"io"
+	"net/http"
 	"time"
 
 	"gitea.urkob.com/urko/btc-pay-checker/internal/domain"
@@ -14,12 +20,14 @@ const defaultExpirationTime = time.Minute * 30
 type Order struct {
 	repo       *order.Repo
 	expiration time.Duration
+	client     *http.Client
 }
 
 func NewOrder(repo *order.Repo) *Order {
 	return &Order{
 		repo:       repo,
 		expiration: defaultExpirationTime,
+		client:     &http.Client{},
 	}
 }
 
@@ -27,7 +35,6 @@ func (o *Order) WithExpiration(expiration time.Duration) *Order {
 	o.expiration = expiration
 	return o
 }
-
 func (o *Order) NewOrder(ctx context.Context, orderID, clientID, email string, amount float64) (*domain.Order, error) {
 	order := domain.Order{
 		ID:        primitive.NewObjectID(),
@@ -54,3 +61,43 @@ func (o *Order) FromAmount(ctx context.Context, amount float64, timestamp time.T
 func (o *Order) OrderCompleted(ctx context.Context, order *domain.Order) (*domain.Order, error) {
 	return o.repo.OrderCompleted(ctx, order)
 }
+
+func (o *Order) Webhook(ctx context.Context, webhookUrl string, order *domain.Order) error {
+	if webhookUrl == "" {
+		return nil
+	}
+
+	reqBody, err := json.Marshal(order)
+	if err != nil {
+		fmt.Println(err)
+		return err
+	}
+
+	payload := bytes.NewReader(reqBody)
+	client := &http.Client{}
+	req, err := http.NewRequest(http.MethodPost, webhookUrl, payload)
+	if err != nil {
+		fmt.Println(err)
+		return err
+	}
+	req.Header.Add("Accept", "application/json")
+	req.Header.Add("Content-Type", "application/json")
+
+	res, err := client.Do(req)
+	if err != nil {
+		return fmt.Errorf("client.Do: %w", err)
+	}
+	if res.StatusCode != http.StatusOK {
+		defer res.Body.Close()
+
+		body, err := io.ReadAll(res.Body)
+		if err != nil {
+			return errors.Join(fmt.Errorf("response status code is: %d", res.StatusCode), err)
+		}
+
+		return fmt.Errorf("response status code is: %d | response body %s body", res.StatusCode, string(body))
+	}
+
+	return nil
+
+}

kit/cfg/config.go

@@ -17,6 +17,7 @@ type Config struct {
 	RpcAuth          string `required:"true" split_words:"true"`
 	RpcHost          string `required:"true" split_words:"true"`
 	WalletAddress    string `required:"true" split_words:"true"`
+	WebhookUrl       string `required:"false" split_words:"true"`
 	ApiPort          string `required:"true" split_words:"true"`
 	Views            string `required:"true" split_words:"true"`
 	ConversorApi     string `required:"true" split_words:"true"`