feat(BRIDGE-424): FIDO2 GUI support.

internal/frontend/grpc/fido_windows.go

@@ -0,0 +1,53 @@
+// 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/>.
+
+//go:build windows
+
+package grpc
+
+import (
+	"context"
+	"fmt"
+
+	"github.com/ProtonMail/gluon/async"
+	"github.com/ProtonMail/proton-bridge/v3/internal/fido"
+	"google.golang.org/protobuf/types/known/emptypb"
+)
+
+func (s *Service) LoginFido(_ context.Context, login *LoginRequest) (*emptypb.Empty, error) {
+	s.log.WithField("username", login.Username).Debug("LoginFido")
+	go func() {
+		defer async.HandlePanic(s.panicHandler)
+
+		if s.auth.UID == "" || s.authClient == nil {
+			s.log.Errorf("Login FIDO: authentication incomplete %s %p", s.auth.UID, s.authClient)
+			_ = s.SendEvent(NewLoginError(LoginErrorType_TFA_ABORT, "Missing authentication, try again."))
+			s.loginClean()
+			return
+		}
+
+		if err := fido.AuthWithHardwareKeyGUI(s.authClient, s.auth, false); err != nil {
+			_ = s.SendEvent(NewLoginError(LoginErrorType_FIDO_ERROR, fmt.Sprintf("Security key authentication failed: %s", err)))
+			s.loginClean()
+			return
+		}
+
+		s.finishLogin()
+	}()
+
+	return &emptypb.Empty{}, nil
+}