import { Strategy } from 'passport-strategy';
import express from 'express';
declare type DoneCallback = (err: Error | null, user?: unknown, info?: unknown) => void;
export declare type VerifyFunctionWithRequest = (req: express.Request, token: string, done: DoneCallback) => void;
export declare type VerifyFunction = (token: string, done: DoneCallback) => void;
export interface UniqueTokenOptions {
    [key: string]: any;
    tokenField?: string;
    tokenQuery?: string;
    tokenParams?: string;
    tokenHeader?: string;
    passReqToCallback?: false;
    caseSensitive?: boolean;
    failOnMissing?: boolean;
}
export interface UniqueTokenOptionsWithRequest {
    [key: string]: any;
    tokenField?: string;
    tokenQuery?: string;
    tokenParams?: string;
    tokenHeader?: string;
    passReqToCallback: true;
    caseSensitive?: boolean;
    failOnMissing?: boolean;
}
export interface UniqueTokenAuthenticateOptions {
    badRequestMessage?: string;
}
/**
 * `Strategy` class.
 *
 * The token authentication strategy authenticates requests based on the
 * credentials submitted through standard request headers, body, querystring or params.
 *
 * Applications must supply a `verify` callback which accepts
 * unique `token` credentials, and then calls the `done` callback supplying a
 * `user`, which should be set to `false` if the credentials are not valid.
 * If an exception occured, `err` should be set.
 *
 * Optionally, `options` can be used to change the fields in which the
 * credentials are found.
 *
 * Options:
 *
 *   - `tokenField`  field name where the token is found, defaults to 'token'
 *   - `tokenQuery`  query string name where the token is found, defaults to 'token'
 *   - `tokenParams`  params name where the token is found, defaults to 'token'
 *   - `tokenHeader`  header name where the token is found, defaults to 'token'
 *   - `passReqToCallback`  when `true`, `req` is the first argument to the verify callback (default: `false`)
 *   - `failOnMissing`  when `false`, if the token is not found it will not fail (default: `true`)
 *   - `caseSensitive`  when `true` the token validation is case Sensitive (default: `false`)
 *
 * Examples:
 *
 *     passport.use(new UniqueTokenStrategy(
 *       function(token, done) {
 *         User.findOne({ token: token }, function (err, user) {
 *           done(err, user);
 *         });
 *       }
 *     ));
 *
 * @param {UniqueTokenOptions | UniqueTokenOptionsWithRequest} options
 * @param {VerifyFunction | VerifyFunctionWithRequest} verify
 * @api public
 */
export declare class UniqueTokenStrategy extends Strategy {
    name: string;
    private defaultToken;
    private tokenField;
    private tokenQuery;
    private tokenParams;
    private tokenHeader;
    private failOnMissing;
    private passReqToCallback;
    private verify;
    constructor(options: UniqueTokenOptionsWithRequest, verify: VerifyFunctionWithRequest);
    constructor(options: UniqueTokenOptions, verify: VerifyFunction);
    constructor(verify: VerifyFunction);
    authenticate(req: express.Request, options?: UniqueTokenAuthenticateOptions): void;
    private sanitizeToken;
}
export {};