Refactor arrtrix webhook to use fixed path and remove legacy config

- Switch arrtrix webhook to a fixed path: /_arrtrix/webhook
- Remove Radarr-specific and secret-based config from arrtrix
- Simplify connector and webhook handler logic
- Update NixOS module to drop legacy webhook config
- Add new tests for generic arrtrix webhook handler

packages/arrtrix/pkg/webhook/arr_test.go

@@ -0,0 +1,114 @@
+package webhook
+
+import (
+	"context"
+	"errors"
+	"net/http"
+	"net/http/httptest"
+	"strings"
+	"testing"
+
+	"maunium.net/go/mautrix/id"
+)
+
+type stubRoomResolver struct {
+	roomID id.RoomID
+	err    error
+}
+
+func (s stubRoomResolver) ResolveManagementRoom(context.Context) (id.RoomID, error) {
+	return s.roomID, s.err
+}
+
+type stubNoticeSender struct {
+	roomID  id.RoomID
+	message string
+	err     error
+}
+
+func (s *stubNoticeSender) SendNotice(_ context.Context, roomID id.RoomID, message string) error {
+	s.roomID = roomID
+	s.message = message
+	return s.err
+}
+
+func TestMountArrRequiresBridge(t *testing.T) {
+	router := http.NewServeMux()
+	if err := MountArr(router, nil); err == nil {
+		t.Fatal("expected nil bridge to fail")
+	}
+}
+
+func TestArrHandlerDeliversNotice(t *testing.T) {
+	sender := &stubNoticeSender{}
+	handler := &ArrHandler{
+		resolver: stubRoomResolver{roomID: "!room:test"},
+		sender:   sender,
+	}
+
+	req := httptest.NewRequest(http.MethodPost, ArrWebhookPath, strings.NewReader(`{"eventType":"Download","movie":{"title":"Dune","year":2021,"imdbId":"tt1160419"},"movieFile":{"quality":"1080p","relativePath":"Dune (2021)/Dune.mkv"},"isUpgrade":false}`))
+	rec := httptest.NewRecorder()
+	handler.ServeHTTP(rec, req)
+
+	if rec.Code != http.StatusAccepted {
+		t.Fatalf("expected accepted status, got %d", rec.Code)
+	}
+	if sender.roomID != "!room:test" {
+		t.Fatalf("expected notice sent to management room, got %q", sender.roomID)
+	}
+	if !strings.Contains(sender.message, "**Arr Download**") || !strings.Contains(sender.message, "Dune (2021)") {
+		t.Fatalf("unexpected message: %s", sender.message)
+	}
+}
+
+func TestArrHandlerReportsAmbiguousManagementRoom(t *testing.T) {
+	handler := &ArrHandler{
+		resolver: stubRoomResolver{err: ErrAmbiguousManagementRoom},
+		sender:   &stubNoticeSender{},
+	}
+
+	req := httptest.NewRequest(http.MethodPost, ArrWebhookPath, strings.NewReader(`{"eventType":"Test"}`))
+	rec := httptest.NewRecorder()
+	handler.ServeHTTP(rec, req)
+
+	if rec.Code != http.StatusConflict {
+		t.Fatalf("expected conflict status, got %d", rec.Code)
+	}
+}
+
+func TestRenderNoticeForTestEvent(t *testing.T) {
+	msg := renderNotice(payload{EventType: "Test"})
+	if strings.TrimSpace(msg) != "**Arr Test**" {
+		t.Fatalf("unexpected test-event message: %q", msg)
+	}
+}
+
+func TestArrHandlerReturnsBadGatewayOnSendFailure(t *testing.T) {
+	handler := &ArrHandler{
+		resolver: stubRoomResolver{roomID: "!room:test"},
+		sender:   &stubNoticeSender{err: errors.New("send failed")},
+	}
+
+	req := httptest.NewRequest(http.MethodPost, ArrWebhookPath, strings.NewReader(`{"eventType":"Test"}`))
+	rec := httptest.NewRecorder()
+	handler.ServeHTTP(rec, req)
+
+	if rec.Code != http.StatusBadGateway {
+		t.Fatalf("expected bad gateway status, got %d", rec.Code)
+	}
+}
+
+func TestArrHandlerRejectsMissingEventType(t *testing.T) {
+	handler := &ArrHandler{
+		resolver: stubRoomResolver{roomID: "!room:test"},
+		sender:   &stubNoticeSender{},
+	}
+
+	req := httptest.NewRequest(http.MethodPost, ArrWebhookPath, strings.NewReader(`{"movie":{"title":"Dune"}}`))
+	rec := httptest.NewRecorder()
+	handler.ServeHTTP(rec, req)
+
+	if rec.Code != http.StatusBadRequest {
+		t.Fatalf("expected bad request status, got %d", rec.Code)
+	}
+}