ai-dispatch 10.38.0

// Keychain-backed token storage for the live aid web connection.
// Exports: KeychainTokenStore.

import Foundation
import Security

enum KeychainTokenStore {
    private static let service = "com.mingsun.aidcommand.web-token"
    private static let account = "aid-web"

    static func load() -> String? {
        let query: [String: Any] = [
            kSecClass as String: kSecClassGenericPassword,
            kSecAttrService as String: service,
            kSecAttrAccount as String: account,
            kSecReturnData as String: true,
            kSecMatchLimit as String: kSecMatchLimitOne,
        ]
        var item: CFTypeRef?
        let status = SecItemCopyMatching(query as CFDictionary, &item)
        guard status == errSecSuccess, let data = item as? Data else { return nil }
        return String(data: data, encoding: .utf8)
    }

    static func save(_ token: String) throws {
        let data = Data(token.utf8)
        let query: [String: Any] = [
            kSecClass as String: kSecClassGenericPassword,
            kSecAttrService as String: service,
            kSecAttrAccount as String: account,
        ]
        let attributes: [String: Any] = [kSecValueData as String: data]
        let update = SecItemUpdate(query as CFDictionary, attributes as CFDictionary)
        if update == errSecSuccess { return }
        if update != errSecItemNotFound {
            throw KeychainError.osStatus(update)
        }
        var add = query
        add[kSecValueData as String] = data
        add[kSecAttrAccessible as String] = kSecAttrAccessibleAfterFirstUnlock
        let status = SecItemAdd(add as CFDictionary, nil)
        guard status == errSecSuccess else { throw KeychainError.osStatus(status) }
    }

    static func clear() {
        let query: [String: Any] = [
            kSecClass as String: kSecClassGenericPassword,
            kSecAttrService as String: service,
            kSecAttrAccount as String: account,
        ]
        SecItemDelete(query as CFDictionary)
    }
}

enum KeychainError: Error {
    case osStatus(OSStatus)
}