/// <reference types="q" />
/// <reference types="express" />
import * as q from 'q';
import * as express from 'express';
import { OAuthConfig, Token } from './types';
/**
 * Returns a promise containing the file content as json object.
 *
 * @param filePath
 * @param fileName
 * @returns {Promise<any>}
 */
export declare function getFileData(filePath: string, fileName: string): q.Promise<any>;
/**
 * Returns the value of a specified header field from a request
 *
 * @param req
 * @param field The name of the field to return
 * @returns {string} The value of the header field
 */
export declare function getHeaderValue(req: express.Request, fieldName: string): string;
/**
 * Returns a basic authentication header value with the given credentials
 *
 * @param client_id
 * @param client_secret
 * @returns {string}
 */
export declare function getBasicAuthHeaderValue(clientId: string, clientSecret: string): string;
/**
 * Extracts and returns an access_token from an authorization header
 *
 * @param authHeader
 * @returns {any}
 */
export declare function extractAccessToken(authHeader: string): string;
/**
 * Attach scopes on the req object for later validation.
 *
 * @param req
 * @returns {function(any): undefined}
 */
export declare function setTokeninfo(req: express.Request): (data: Token) => void;
/**
 * Reject a request with 401 or the given status code.
 *
 * @param res
 * @param status
 */
export declare function rejectRequest(res: express.Response, status?: number): void;
/**
 * Validates options object and throws TypeError if mandatory options is not specified.
 *
 * @param options
 */
export declare function validateOAuthConfig(options: OAuthConfig): void;