OAuthTokenLocalDataSource.kt

@Singleton
class OAuthTokenLocalDataSource @Inject constructor(
    app: Application
) {
    private val sharedPrefs: SharedPreferences = EncryptedSharedPreferences.create(
        "oauth_token_local_data_source",
        MasterKeys.getOrCreate(MasterKeys.AES256_GCM_SPEC),
        app,
        EncryptedSharedPreferences.PrefKeyEncryptionScheme.AES256_SIV,
        EncryptedSharedPreferences.PrefValueEncryptionScheme.AES256_GCM
    )

    var oAuthToken: OAuthToken?
        get() = sharedPrefs.getString(KEY_OAUTH_TOKEN, null)?.let(Json::decodeFromString)
        set(value) {
            sharedPrefs.edit {
                putString(KEY_OAUTH_TOKEN, value?.let(Json::encodeToString))
            }
        }

    private companion object {
        private const val KEY_OAUTH_TOKEN = "oauth_token"
    }
}