file.kt

@Service
@Profile("scanner")
open class EncryptedRestService
@Autowired constructor(val cryptoService: CryptoService) {

    fun <T, R : Any> post(url: String, params: T): Request<T, R> {
        return Request(url, HttpMethod.POST, params)
    }

    inner class Request<T, R : Any>(val url: String, val method: HttpMethod, val params: T? = null) {
        fun withCredentials(username: String, password: String): EncryptedRequest<T, R> {
            val headers = HttpHeaders()
            val key = byteArrayOf()
            return EncryptedRequest(this, headers, key)
        }
    }

    inner class EncryptedRequest<T, R : Any>(req: Request<T, R>,
                                             val headers: HttpHeaders,
                                             val key: ByteArray) {
        fun expect(clazz: KClass<R>): R? {
            return null
        }
    }
}