/**
 * Library containing useful function to generate and encrypt password and so on.
 */
import User from "../entities/user.entity";
import { Request } from "express";
/**
 * Encrypt a plain password. This method support async/await.
 * @param plainPassword the original plain text password
 * @return a promise with the ecrypted password
 */
export declare function hashPassword(plainPassword: string): Promise<string>;
/**
 * Verify that a plain password match with an encrypted hashPassword.
 * This method support async/await
 * @param plainPassword the plain text password
 * @param hashPassword the encrypted (or hashed) password
 * @return a promise, true if the two passwords match, false otherwise
 */
export declare function verifyPassword(plainPassword: string, hashPassword: string): Promise<boolean>;
/**
 * Generate a new text plain password
 * @return a new generated password
 */
export declare function generatePassword(): string;
/**
 *  Enum with self-explanatories errors for the user login method
 */
export declare enum UserErrors {
    NOT_FOUND = 1,
    WRONG_PASSWORD = 2
}
/**
 * Execute the login of a user, using the standard User Entity.
 * @param email the user email
 * @param password the plain text password
 * @return a promise, with an error if somethink goes wrong, or the user if the login was successul
 */
export declare function performLogin(email: string, password: string): Promise<User | UserErrors>;
/**
 * Create a new cookie-based session for the user.
 * @param req the standard Express session
 * @param user the logged-in user
 */
export declare function createUserSession(req: Request, user: User): void;
/**
 * Destoy (if any) the current user session.
 * @param req the standard Express session
 */
export declare function destroyUserSession(req: Request): void;
/**
 * Retrieve the user from the current session
 * @param req the standard Express session
 * @return a promise, with the user if logged, or undefined
 */
export declare function retrieveUserFromSession(req: Request): Promise<User | undefined>;