ios/MullvadVPN/Keychain/KeychainMatchLimit.swift


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//
//  KeychainMatchLimit.swift
//  MullvadVPN
//
//  Created by pronebird on 24/04/2020.
//  Copyright © 2020 Mullvad VPN AB. All rights reserved.
//

import Foundation
import Security

extension Keychain {
    enum MatchLimit: RawRepresentable, CaseIterable, KeychainAttributeDecodable, KeychainAttributeEncodable {
        case one
        case all

        var rawValue: CFString {
            switch self {
            case .one:
                return kSecMatchLimitOne
            case .all:
                return kSecMatchLimitAll
            }
        }

        init?(rawValue: CFString) {
            let maybeCase = Self.allCases.first { $0.rawValue == rawValue }

            if let maybeCase = maybeCase {
                self = maybeCase
            } else {
                return nil
            }
        }

        init?(attributes: [CFString : Any]) {
            if let rawValue = attributes[kSecMatchLimit] as? String {
                self.init(rawValue: rawValue as CFString)
            } else {
                return nil
            }
        }

        func updateKeychainAttributes(in attributes: inout [CFString : Any]) {
            attributes[kSecMatchLimit] = rawValue
        }
    }
}