dotdenote/Sources/Services/KeychainStore.swift

import Foundation
import Security

enum KeychainStore {
    private static let service = "dev.andros.dotdenote"

    static func set(_ value: String?, for key: String) {
        let q: [String: Any] = [
            kSecClass as String: kSecClassGenericPassword,
            kSecAttrService as String: service,
            kSecAttrAccount as String: key
        ]
        SecItemDelete(q as CFDictionary)
        guard let value, let data = value.data(using: .utf8) else { return }
        var attrs = q
        attrs[kSecValueData as String] = data
        attrs[kSecAttrAccessible as String] = kSecAttrAccessibleAfterFirstUnlock
        SecItemAdd(attrs as CFDictionary, nil)
    }

    static func get(_ key: String) -> String? {
        let q: [String: Any] = [
            kSecClass as String: kSecClassGenericPassword,
            kSecAttrService as String: service,
            kSecAttrAccount as String: key,
            kSecReturnData as String: true,
            kSecMatchLimit as String: kSecMatchLimitOne
        ]
        var result: AnyObject?
        let status = SecItemCopyMatching(q as CFDictionary, &result)
        guard status == errSecSuccess,
              let data = result as? Data,
              let s = String(data: data, encoding: .utf8) else { return nil }
        return s
    }
}