feat(BRIDGE-356): Added retry logic for unavailable preferred keychain on Linux; Feature flag support before bridge initialization; Refactored some bits of the code;

internal/vault/keychain_state.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/>.
+
+package vault
+
+import (
+	"runtime"
+
+	"github.com/ProtonMail/proton-bridge/v3/internal/platform"
+	"github.com/ProtonMail/proton-bridge/v3/internal/vault/storage"
+)
+
+const keychainStateFileName = "keychain_state.json"
+
+type KeychainState struct {
+	FailedAttempts int
+}
+
+var keychainStateFile = storage.NewJSONStorageFile[KeychainState](keychainStateFileName, "keychain state") //nolint:gochecknoglobals
+
+func LoadKeychainState(vaultDir string) (KeychainState, error) {
+	if runtime.GOOS != platform.LINUX {
+		return KeychainState{}, nil
+	}
+	return keychainStateFile.Load(vaultDir)
+}
+
+func (k KeychainState) Save(vaultDir string) error {
+	if runtime.GOOS != platform.LINUX {
+		return nil
+	}
+
+	return keychainStateFile.Save(vaultDir, k)
+}
+
+func (k KeychainState) ResetAndSave(vaultDir string) error {
+	k.FailedAttempts = 0
+	return k.Save(vaultDir)
+}