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//
// KeychainSettingsStore.swift
// MullvadVPN
//
// Created by Sajad Vishkai on 2022-11-22.
// Copyright © 2025 Mullvad VPN AB. All rights reserved.
//
import Foundation
import MullvadTypes
import Security
final public class KeychainSettingsStore: SettingsStore, Sendable {
public let serviceName: String
public let accessGroup: String
public init(serviceName: String, accessGroup: String) {
self.serviceName = serviceName
self.accessGroup = accessGroup
}
public func read(key: SettingsKey) throws -> Data {
try readItemData(key)
}
public func write(_ data: Data, for key: SettingsKey) throws {
try addOrUpdateItem(key, data: data)
}
public func delete(key: SettingsKey) throws {
try deleteItem(key)
}
private func addItem(_ item: SettingsKey, data: Data) throws {
var query = createDefaultAttributes(item: item)
query.merge(createAccessAttributes()) { current, _ in
current
}
query[kSecValueData] = data
let status = SecItemAdd(query as CFDictionary, nil)
if status != errSecSuccess {
throw KeychainError(code: status)
}
}
private func updateItem(_ item: SettingsKey, data: Data) throws {
let query = createDefaultAttributes(item: item)
let status = SecItemUpdate(
query as CFDictionary,
[kSecValueData: data] as CFDictionary
)
if status != errSecSuccess {
throw KeychainError(code: status)
}
}
private func addOrUpdateItem(_ item: SettingsKey, data: Data) throws {
do {
try updateItem(item, data: data)
} catch let error as KeychainError where error == .itemNotFound {
try addItem(item, data: data)
} catch {
throw error
}
}
private func readItemData(_ item: SettingsKey) throws -> Data {
var query = createDefaultAttributes(item: item)
query[kSecReturnData] = true
var result: CFTypeRef?
let status = SecItemCopyMatching(query as CFDictionary, &result)
if status == errSecSuccess {
return result as? Data ?? Data()
} else {
throw KeychainError(code: status)
}
}
private func deleteItem(_ item: SettingsKey) throws {
let query = createDefaultAttributes(item: item)
let status = SecItemDelete(query as CFDictionary)
if status != errSecSuccess {
throw KeychainError(code: status)
}
}
private func createDefaultAttributes(item: SettingsKey) -> [CFString: Any] {
[
kSecClass: kSecClassGenericPassword,
kSecAttrService: serviceName,
kSecAttrAccount: item.rawValue,
]
}
private func createAccessAttributes() -> [CFString: Any] {
[
kSecAttrAccessGroup: accessGroup,
kSecAttrAccessible: kSecAttrAccessibleAfterFirstUnlock,
]
}
}
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