EncryptedPreferencesImpl

const val PREF_NAME = "apiKeys"
const val PREF_DATA = "PREF_DATA"

class EncryptedPreferencesImpl(context: Context) : EncryptedPreferences {
    private val masterKey = MasterKey.Builder(context)
        .setKeyScheme(MasterKey.KeyScheme.AES256_GCM)
        .build() as? MasterKey

    private val preferences = masterKey?.let {
        EncryptedSharedPreferences.create(
            context,
            PREF_NAME,
            it,
            EncryptedSharedPreferences.PrefKeyEncryptionScheme.AES256_SIV,
            EncryptedSharedPreferences.PrefValueEncryptionScheme.AES256_GCM
        )
    }

    override fun saveEncryptedData(encryptedData: String): Boolean {
        return if (preferences != null) {
            preferences.edit {
                putString(PREF_DATA, encryptedData)
            }
            true
        } else false
    }

    override fun readEncryptedData(): String? {
        val data = preferences?.getString(PREF_DATA, null)

        return if (data != null) data
        else null
    }

    override fun areApiKeysReady(): Boolean {
        val firstCondition = preferences != null
                && preferences.contains(PREF_DATA)
        val secondCondition = readEncryptedData() != null
        return firstCondition && secondCondition
    }
}