nexarch/internal/webhook/webhook_test.go

package webhook

import (
	"context"
	"encoding/json"
	"io"
	"net/http"
	"net/http/httptest"
	"os"
	"sync/atomic"
	"testing"
	"time"

	"github.com/jackc/pgx/v5/pgxpool"
)

func setupTest(t *testing.T) (*Store, *pgxpool.Pool, func()) {
	t.Helper()
	adminDSN := os.Getenv("TEST_ADMIN_DSN")
	if adminDSN == "" {
		t.Skip("TEST_ADMIN_DSN nicht gesetzt, Integrationstest uebersprungen")
	}
	ctx := context.Background()

	pool, err := pgxpool.New(ctx, adminDSN)
	if err != nil {
		t.Fatalf("pool: %v", err)
	}
	if _, err := pool.Exec(ctx, `
		CREATE EXTENSION IF NOT EXISTS pgcrypto;
		CREATE TABLE IF NOT EXISTS webhook_subscriptions (
			id UUID PRIMARY KEY DEFAULT gen_random_uuid(), event_type TEXT NOT NULL,
			target_url TEXT NOT NULL, secret TEXT NOT NULL, created_at TIMESTAMPTZ NOT NULL DEFAULT now()
		);
		CREATE TABLE IF NOT EXISTS webhook_deliveries (
			id UUID PRIMARY KEY DEFAULT gen_random_uuid(), subscription_id UUID NOT NULL REFERENCES webhook_subscriptions(id),
			event_type TEXT NOT NULL, payload JSONB NOT NULL, status TEXT NOT NULL DEFAULT 'pending',
			attempt INT NOT NULL DEFAULT 0, next_attempt_at TIMESTAMPTZ NOT NULL DEFAULT now(),
			last_error TEXT, created_at TIMESTAMPTZ NOT NULL DEFAULT now(), delivered_at TIMESTAMPTZ
		);
	`); err != nil {
		t.Fatalf("schema: %v", err)
	}

	cleanup := func() { pool.Close() }
	return NewStore(pool), pool, cleanup
}

func uniqueEventType(prefix string) string {
	return prefix + "-" + time.Now().Format("150405.000000000")
}

// Akzeptanzkriterium 1 + Pruefung 1: ein Modul reicht ein Ereignis ein
// (Enqueue) ohne eigene Zustellungslogik, der zentrale Dispatcher liefert
// zuverlaessig aus.
func TestEnqueueAndProcessDue_DeliversSuccessfully(t *testing.T) {
	store, pool, cleanup := setupTest(t)
	defer cleanup()
	ctx := context.Background()

	var receivedBody []byte
	var receivedSignature string
	target := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		body, _ := io.ReadAll(r.Body)
		receivedBody = body
		receivedSignature = r.Header.Get(SignatureHeader)
		w.WriteHeader(http.StatusOK)
	}))
	defer target.Close()

	eventType := uniqueEventType("dms.file.created")
	sub, err := store.Subscribe(ctx, eventType, target.URL, "geheimes-secret")
	if err != nil {
		t.Fatalf("subscribe: %v", err)
	}

	n, err := store.Enqueue(ctx, eventType, map[string]string{"file_id": "42"})
	if err != nil {
		t.Fatalf("enqueue: %v", err)
	}
	if n != 1 {
		t.Fatalf("erwartet 1 eingereihte zustellung, habe %d", n)
	}

	dispatcher := NewDispatcher(pool, target.Client())
	processed, err := dispatcher.ProcessDue(ctx)
	if err != nil {
		t.Fatalf("processdue: %v", err)
	}
	if processed != 1 {
		t.Fatalf("erwartet 1 verarbeitete zustellung, habe %d", processed)
	}

	var status string
	if err := pool.QueryRow(ctx, `SELECT status FROM webhook_deliveries WHERE subscription_id = $1`, sub.ID).Scan(&status); err != nil {
		t.Fatalf("status lesen: %v", err)
	}
	if status != StatusDelivered {
		t.Fatalf("status = %q, want %q", status, StatusDelivered)
	}

	expectedPayload, _ := json.Marshal(map[string]string{"file_id": "42"})
	expectedSig := Sign("geheimes-secret", expectedPayload)
	if receivedSignature != expectedSig {
		t.Fatalf("empfangene signatur = %q, want %q", receivedSignature, expectedSig)
	}
	if string(receivedBody) != string(expectedPayload) {
		t.Fatalf("empfangener payload = %q, want %q", receivedBody, expectedPayload)
	}
}

// Akzeptanzkriterium 2 + Pruefung 2: fehlschlagendes Ziel loest Retry mit
// wachsendem Backoff aus und endet nach der konfigurierten Obergrenze in
// "failed".
func TestProcessDue_RetriesWithBackoffThenMarksFailed(t *testing.T) {
	store, pool, cleanup := setupTest(t)
	defer cleanup()
	ctx := context.Background()

	var callCount int32
	target := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		atomic.AddInt32(&callCount, 1)
		w.WriteHeader(http.StatusInternalServerError)
	}))
	defer target.Close()

	eventType := uniqueEventType("mail.send.failed")
	sub, err := store.Subscribe(ctx, eventType, target.URL, "secret")
	if err != nil {
		t.Fatalf("subscribe: %v", err)
	}
	if _, err := store.Enqueue(ctx, eventType, map[string]string{"x": "y"}); err != nil {
		t.Fatalf("enqueue: %v", err)
	}

	dispatcher := NewDispatcher(pool, target.Client())
	dispatcher.MaxAttempts = 2
	dispatcher.BaseBackoff = 30 * time.Millisecond

	// 1. Versuch: schlaegt fehl, ist aber noch nicht die Obergrenze.
	if _, err := dispatcher.ProcessDue(ctx); err != nil {
		t.Fatalf("processdue 1: %v", err)
	}
	var status string
	var attempt int
	if err := pool.QueryRow(ctx, `SELECT status, attempt FROM webhook_deliveries WHERE subscription_id = $1`, sub.ID).Scan(&status, &attempt); err != nil {
		t.Fatalf("status lesen 1: %v", err)
	}
	if status != StatusPending || attempt != 1 {
		t.Fatalf("nach 1. fehlschlag: status=%q attempt=%d, want pending/1", status, attempt)
	}

	// Sofort erneut verarbeiten: Backoff ist noch nicht abgelaufen -> nichts faellig.
	processedTooEarly, err := dispatcher.ProcessDue(ctx)
	if err != nil {
		t.Fatalf("processdue (zu frueh): %v", err)
	}
	if processedTooEarly != 0 {
		t.Fatal("erwartet 0 verarbeitete zustellungen, solange backoff nicht abgelaufen ist")
	}

	time.Sleep(dispatcher.backoffFor(1) + 20*time.Millisecond)

	// 2. Versuch: erreicht MaxAttempts=2 -> endgueltig fehlgeschlagen.
	if _, err := dispatcher.ProcessDue(ctx); err != nil {
		t.Fatalf("processdue 2: %v", err)
	}
	if err := pool.QueryRow(ctx, `SELECT status, attempt FROM webhook_deliveries WHERE subscription_id = $1`, sub.ID).Scan(&status, &attempt); err != nil {
		t.Fatalf("status lesen 2: %v", err)
	}
	if status != StatusFailed || attempt != 2 {
		t.Fatalf("nach 2. fehlschlag: status=%q attempt=%d, want failed/2", status, attempt)
	}
	if atomic.LoadInt32(&callCount) != 2 {
		t.Fatalf("erwartet genau 2 tatsaechliche zustellversuche, habe %d", callCount)
	}
}

// Akzeptanzkriterium 3 + Pruefung 3: Signaturpruefung erkennt eine
// manipulierte Payload zuverlaessig.
func TestVerifySignature_DetectsTamperedPayload(t *testing.T) {
	secret := "geteiltes-geheimnis"
	payload := []byte(`{"file_id":"42"}`)
	signature := Sign(secret, payload)

	if !VerifySignature(secret, payload, signature) {
		t.Fatal("erwartet gueltige signatur fuer unveraenderte payload")
	}

	tampered := []byte(`{"file_id":"99"}`)
	if VerifySignature(secret, tampered, signature) {
		t.Fatal("erwartet ungueltige signatur fuer manipulierte payload")
	}

	if VerifySignature("falsches-secret", payload, signature) {
		t.Fatal("erwartet ungueltige signatur bei falschem secret")
	}
}