import { Logger } from '../Logger';
import { Authed } from '../types/Authed';
import { AuthProvider } from './AuthProvider';
/**
 * Authenticates the with the a2w API using an API key and secret.
 *
 * Used to make authentication requests to a2w in order to obtain tokens. The
 * tokens will be used for future requests to the API.
 */
export default class KeysProvider implements AuthProvider {
    private readonly key;
    private readonly secret;
    /**
     * The successful last authentication.
     */
    private authed?;
    /**
     * The logger.
     */
    private logger;
    /**
     * Constructor.
     *
     * @param key The API key.
     * @param secret The API secret.
     * @param logger The logger to use.
     */
    constructor(key: string, secret: string, logger?: Logger);
    /**
     * @inheritdoc
     */
    setLogger: (logger: Logger) => void;
    /**
     * @inheritdoc
     */
    getAuthed: () => Authed | undefined;
    /**
     * @inheritdoc
     */
    authenticate: () => Promise<string>;
}