/**
 * @module botframework-connector
 */
/**
 * Copyright (c) Microsoft Corporation. All rights reserved.
 * Licensed under the MIT License.
 */
import * as msrest from '@azure/ms-rest-js';
import * as adal from 'adal-node';
/**
 * General AppCredentials auth implementation and cache. Supports any ADAL client credential flow.
 * Subclasses can implement refreshToken to acquire the token.
 */
export declare abstract class AppCredentials implements msrest.ServiceClientCredentials {
    private static readonly cache;
    appId: string;
    private _oAuthEndpoint?;
    private _oAuthScope?;
    private _tenant?;
    tokenCacheKey: string;
    protected refreshingToken: Promise<adal.TokenResponse> | null;
    protected authenticationContext: adal.AuthenticationContext | null;
    private toJSON;
    /**
     * Initializes a new instance of the [AppCredentials](xref:botframework-connector.AppCredentials) class.
     *
     * @param appId The App ID.
     * @param channelAuthTenant Optional. The oauth token tenant.
     * @param oAuthScope The scope for the token.
     */
    constructor(appId: string, channelAuthTenant?: string, oAuthScope?: string);
    /**
     * Gets tenant to be used for channel authentication.
     *
     * @returns The channel auth token tenant for this credential.
     */
    private get tenant();
    /**
     * Sets tenant to be used for channel authentication.
     */
    private set tenant(value);
    /**
     * Gets the OAuth scope to use.
     *
     * @returns The OAuth scope to use.
     */
    get oAuthScope(): string;
    /**
     * Sets the OAuth scope to use.
     */
    set oAuthScope(value: string);
    /**
     * Gets the OAuth endpoint to use.
     *
     * @returns The OAuthEndpoint to use.
     */
    get oAuthEndpoint(): string;
    /**
     * Sets the OAuth endpoint to use.
     */
    set oAuthEndpoint(value: string);
    /**
     * Adds the host of service url to trusted hosts.
     * If expiration time is not provided, the expiration date will be current (utc) date + 1 day.
     *
     * @deprecated
     *
     * @param  {string} serviceUrl The service url
     * @param  {Date} expiration? The expiration date after which this service url is not trusted anymore
     */
    static trustServiceUrl(serviceUrl: string, expiration?: Date): void;
    /**
     * Checks if the service url is for a trusted host or not.
     *
     * @deprecated
     *
     * @param  {string} serviceUrl The service url
     * @returns {boolean} True if the host of the service url is trusted; False otherwise.
     */
    static isTrustedServiceUrl(serviceUrl: string): boolean;
    /**
     * Apply the credentials to the HTTP request.
     *
     * @param webResource The WebResource HTTP request.
     * @returns A Promise representing the asynchronous operation.
     */
    signRequest(webResource: msrest.WebResource): Promise<msrest.WebResource>;
    /**
     * Gets an OAuth access token.
     *
     * @param forceRefresh True to force a refresh of the token; or false to get
     * a cached token if it exists.
     * @returns A Promise that represents the work queued to execute.
     * @remarks If the promise is successful, the result contains the access token string.
     */
    getToken(forceRefresh?: boolean): Promise<string>;
    protected abstract refreshToken(): Promise<adal.TokenResponse>;
    /**
     * @private
     */
    private shouldSetToken;
}
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