Add build tags for Firebase

server/server_firebase.go

@@ -1,3 +1,5 @@
+//go:build !nofirebase
+
 package server
 
 import (
@@ -14,6 +16,10 @@ import (
 )
 
 const (
+	// FirebaseAvailable is a constant used to indicate that Firebase support is available.
+	// It can be disabled with the 'nofirebase' build tag.
+	FirebaseAvailable = true
+
 	fcmMessageLimit         = 4000
 	fcmApnsBodyMessageLimit = 100
 )
@@ -73,7 +79,7 @@ type firebaseSenderImpl struct {
 	client *messaging.Client
 }
 
-func newFirebaseSender(credentialsFile string) (*firebaseSenderImpl, error) {
+func newFirebaseSender(credentialsFile string) (firebaseSender, error) {
 	fb, err := firebase.NewApp(context.Background(), nil, option.WithCredentialsFile(credentialsFile))
 	if err != nil {
 		return nil, err

server/server_firebase_dummy.go

@@ -0,0 +1,38 @@
+//go:build nofirebase
+
+package server
+
+import (
+	"errors"
+	"heckel.io/ntfy/v2/user"
+)
+
+const (
+	// FirebaseAvailable is a constant used to indicate that Firebase support is available.
+	// It can be disabled with the 'nofirebase' build tag.
+	FirebaseAvailable = false
+)
+
+var (
+	errFirebaseNotAvailable      = errors.New("Firebase not available")
+	errFirebaseTemporarilyBanned = errors.New("visitor temporarily banned from using Firebase")
+)
+
+type firebaseClient struct {
+}
+
+func (c *firebaseClient) Send(v *visitor, m *message) error {
+	return errFirebaseNotAvailable
+}
+
+type firebaseSender interface {
+	Send(m string) error
+}
+
+func newFirebaseClient(sender firebaseSender, auther user.Auther) *firebaseClient {
+	return nil
+}
+
+func newFirebaseSender(credentialsFile string) (firebaseSender, error) {
+	return nil, errFirebaseNotAvailable
+}

server/server_firebase_test.go

@@ -1,3 +1,5 @@
+//go:build !nofirebase
+
 package server
 
 import (