UnbluKeychainPreferencesStorage

@available(*, deprecated, message: "UnbluKeychainPreferencesStorage is deprecated. Provide your own secure `UnbluPreferencesStorage` implementation instead. When this class is removed, securePreferencesStorage will fall back to the non-secure preferencesStorage.")
class UnbluKeychainPreferencesStorage

Helper class that stores Unblu preferences in the iOS Keychain.

NOTE: This helper is deprecated. The SDK should no longer access the Keychain directly. Apps must provide their own implementation of UnbluPreferencesStorage.

Below is the shortest correct minimal example for simple string storage.

final class KeychainPreferencesStorage: UnbluPreferencesStorage {

    private let service = "com.example.myapp.unbluPrefs"

    func put(key: String, value: String?) {
        delete(key: key)
        guard let value, let data = value.data(using: .utf8) else { return }

        let query: [String: Any] = [
            kSecClass as String: kSecClassGenericPassword,
            kSecAttrService as String: service,
            kSecAttrAccount as String: key,
            kSecValueData as String: data,
            kSecAttrAccessible as String: kSecAttrAccessibleAfterFirstUnlock
        ]

        SecItemAdd(query as CFDictionary, nil)
    }

    func get(key: String) -> String? {
        var query: [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(query as CFDictionary, &result)
        guard status == errSecSuccess, let data = result as? Data else { return nil }

        return String(data: data, encoding: .utf8)
    }

    private func delete(key: String) {
        let query: [String: Any] = [
            kSecClass as String: kSecClassGenericPassword,
            kSecAttrService as String: service,
            kSecAttrAccount as String: key
        ]
        SecItemDelete(query as CFDictionary)
    }
}