import { Request } from 'express';
import { OAuth2Client } from 'google-auth-library';
import { Profile as PassportProfile } from 'passport';
interface StrategyOptions {
    clientID: string;
}
export interface Profile extends PassportProfile {
    id: string;
    username?: string;
    name?: {
        givenName: string;
        middleName?: string;
        familyName: string;
    };
    photos: {
        value: string;
    }[];
    emails: {
        value: string;
        verified: boolean;
    }[];
    displayName: string;
    _json: any;
}
export interface StrategyOptionsWithRequest extends StrategyOptions {
    passReqToCallback: true;
}
declare type Info = {
    message: string;
};
declare type DoneCallback = (error: Error | null, user: any | undefined, options: Info | undefined) => void;
declare type VerifyArgs = [
    idToken: string,
    profile: Profile,
    doneCallback: DoneCallback
];
export declare type VerifyFunction = (...args: VerifyArgs) => void;
export declare type VerifyFunctionWithRequest = (req: Request, ...args: VerifyArgs) => void;
/**
 * `GoogleOIDCTokenStrategy` constructor.
 *
 * The Google OIDC token strategy authenticates using the Google Auth Library
 *
 * Applications must supply a `verify` callback which accepts an `accessToken`,
 * `refreshToken` and service-specific `profile`, and then calls the `cb`
 * callback supplying a `user`, which should be set to `false` if the
 * credentials are not valid.  If an exception occurred, `err` should be set.
 *
 * @param {Object} options
 * @param {Function} verify
 * @example
 * passport.use(new GoogleOIDCTokenStrategy(
 *   {
 *     clientID: '123456789',
 *   },
 *   (accessToken, refreshToken, profile, cb) => {
 *     User.findOrCreate({ googleId: profile.id }, cb);
 *   }
 * );
 */
export default class GoogleOIDCTokenStrategy {
    client: OAuth2Client;
    clientId: string;
    name: string;
    _verify: VerifyFunction | VerifyFunctionWithRequest;
    _passReqToCallback: boolean;
    error: (err: Error | unknown) => void;
    fail: (info: Info | undefined) => void;
    success: (user: any, info: Info | undefined) => void;
    constructor(options: StrategyOptionsWithRequest, verify: VerifyFunctionWithRequest);
    constructor(options: StrategyOptions, verify: VerifyFunction);
    /**
     * Authenticate request using Google Auth Library
     * @param {Object} req
     */
    authenticate(req: Request): Promise<void>;
    /**
     * This method handles searhing the value of provided field in body, query, and header.
     *
     * @param {Object} req http request object
     * @param {String} field
     * @returns {String} field's value in body, query, or headers
     */
    private lookup;
    /**
     * Parse profile.
     *
     * Parses user profiles as fetched from Google's OpenID Connect-compatible user
     * info endpoint.
     *
     * The amount of detail in the profile varies based on the scopes granted by the
     * user. The following scope values add additional data:
     *
     *     `profile` - basic profile information
     *     `email` - email address
     *
     * References:
     *   - https://developers.google.com/identity/protocols/OpenIDConnect
     *
     * @param {object} payload
     * @return {object}
     */
    private static parseProfile;
}
export {};