Support email received webhook (#271)

functions/emailReceive/main.go

@@ -19,6 +19,7 @@ import (
 	"github.com/harryzcy/mailbox/internal/env"
 	"github.com/harryzcy/mailbox/internal/thread"
 	"github.com/harryzcy/mailbox/internal/util/format"
+	"github.com/harryzcy/mailbox/internal/webhook"
 )
 
 func main() {
@@ -108,7 +109,20 @@ func receiveEmail(ctx context.Context, ses events.SimpleEmailService) {
 			Timestamp: ses.Mail.Timestamp.UTC().Format(time.RFC3339),
 		})
 		if err != nil {
-			log.Fatalf("failed to send email receipt to SQS, %v", err)
+			log.Printf("failed to send email receipt to SQS, %v\n", err)
+		}
+	}
+
+	if webhook.Enabled() {
+		err = webhook.SendWebhook(ctx, &webhook.Webhook{
+			Event:  webhook.EventEmail,
+			Action: webhook.ActionReceived,
+			Email: webhook.Email{
+				ID: ses.Mail.MessageID,
+			},
+		})
+		if err != nil {
+			log.Printf("failed to send webhook, %v\n", err)
 		}
 	}
 }

internal/env/env.go

@@ -11,4 +11,6 @@ var (
 	GsiIndexName         = os.Getenv("DYNAMODB_TIME_INDEX")
 	S3Bucket             = os.Getenv("S3_BUCKET")
 	QueueName            = os.Getenv("SQS_QUEUE")
+
+	WebhookURL = os.Getenv("WEBHOOK_URL")
 )

internal/webhook/webhook.go

@@ -0,0 +1,53 @@
+package webhook
+
+import (
+	"bytes"
+	"context"
+	"encoding/json"
+	"net/http"
+	"time"
+
+	"github.com/harryzcy/mailbox/internal/env"
+)
+
+const (
+	EventEmail     = "email"
+	ActionReceived = "received"
+)
+
+type Webhook struct {
+	Event  string `json:"event"`
+	Action string `json:"action"`
+	Email  Email
+}
+
+type Email struct {
+	ID string `json:"id"` // message id
+}
+
+func Enabled() bool {
+	return env.WebhookURL != ""
+}
+
+func SendWebhook(ctx context.Context, data *Webhook) error {
+	client := http.Client{
+		Timeout: 5 * time.Second,
+	}
+
+	body, err := json.Marshal(data)
+	if err != nil {
+		return err
+	}
+	req, err := http.NewRequestWithContext(ctx, "POST", env.WebhookURL, bytes.NewReader(body))
+	if err != nil {
+		return err
+	}
+
+	res, err := client.Do(req)
+	if err != nil {
+		return err
+	}
+	defer res.Body.Close()
+
+	return nil
+}

internal/webhook/webhook_test.go

@@ -0,0 +1,45 @@
+package webhook
+
+import (
+	"context"
+	"encoding/json"
+	"net/http"
+	"net/http/httptest"
+	"testing"
+
+	"github.com/harryzcy/mailbox/internal/env"
+	"github.com/stretchr/testify/assert"
+)
+
+func TestSendWebhook(t *testing.T) {
+	server := httptest.NewServer(http.HandlerFunc(func(rw http.ResponseWriter, req *http.Request) {
+		var webhook Webhook
+		err := json.NewDecoder(req.Body).Decode(&webhook)
+		assert.Nil(t, err)
+		assert.Equal(t, EventEmail, webhook.Event)
+		assert.Equal(t, ActionReceived, webhook.Action)
+		assert.Equal(t, "123", webhook.Email.ID)
+
+		_, err = rw.Write([]byte("OK"))
+		assert.Nil(t, err)
+	}))
+	defer server.Close()
+
+	env.WebhookURL = server.URL
+	err := SendWebhook(context.Background(), &Webhook{
+		Event:  EventEmail,
+		Action: ActionReceived,
+		Email:  Email{ID: "123"},
+	})
+	assert.Nil(t, err)
+}
+
+func TestSendWebhook_Error(t *testing.T) {
+	env.WebhookURL = ""
+	err := SendWebhook(context.Background(), &Webhook{
+		Event:  EventEmail,
+		Action: ActionReceived,
+		Email:  Email{ID: "123"},
+	})
+	assert.NotNil(t, err)
+}