feat(BRIDGE-424): FIDO2 GUI support.

internal/frontend/grpc/fido/manager.go

@@ -0,0 +1,55 @@
+// Copyright (c) 2025 Proton AG
+//
+// This file is part of Proton Mail Bridge.
+//
+// Proton Mail Bridge is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// Proton Mail Bridge is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with Proton Mail Bridge. If not, see <https://www.gnu.org/licenses/>.
+
+package fido
+
+import (
+	"context"
+	"sync"
+)
+
+type Manager struct {
+	mu     sync.Mutex
+	cancel context.CancelFunc
+}
+
+func (fm *Manager) withLock(fn func()) {
+	fm.mu.Lock()
+	defer fm.mu.Unlock()
+	fn()
+}
+
+func (fm *Manager) SetCancel(cancel context.CancelFunc) {
+	fm.withLock(func() {
+		fm.cancel = cancel
+	})
+}
+
+func (fm *Manager) Cancel() {
+	fm.withLock(func() {
+		if fm.cancel != nil {
+			fm.cancel()
+			fm.cancel = nil
+		}
+	})
+}
+
+func (fm *Manager) Clear() {
+	fm.withLock(func() {
+		fm.cancel = nil
+	})
+}