/**
 * Copyright (c) Trimble Inc.
 */
import { TokenProvider } from '../interfaces/TokenProvider';
import { EndpointProvider } from '../interfaces/EndpointProvider';
/**
 * The Client Credentials grant is used when applications request an access token to access their own resources.
 *
 */
export default class ClientCredentialTokenProvider implements TokenProvider {
    private readonly _endpointProvider;
    private readonly _clientId;
    private readonly _clientSecret;
    private _scopes;
    private _accessToken;
    private _tokenExpiry;
    private readonly _httpClient;
    /**
     * Public constructor for ClientCredentialTokenProvider class
     *
     * @param endpointProvider - An endpoint provider that provides the URL for the Trimble Identity token endpoint.
     * It can be OpenIdEndpointProvider/FixedEndpointProvider
     * @param clientId - The client id for the calling application
     * @param clientSecret - The client secret for the calling application
     */
    constructor(endpointProvider: EndpointProvider, clientId: string, clientSecret: string);
    /**
     * Fluent extension to add scopes
     *
     * @param scopes - The scopes to add to the token provider
     */
    WithScopes(scopes: string[]): this;
    /**
     * Retrieves an access token for the application
     *
     * @returns A promise that resolves to the value of the access token on completion
     * @throws Thrown when a token endpoint is not provided by the endpoint provider
     * @throws Thrown when a call to the token endpoint fails
     */
    RetrieveToken(): Promise<string>;
    /**
     * Internal method to refresh the access token
     *
     * @returns Promise that resolves when token is refreshed
     */
    private _refreshToken;
}