andela/magma-backend

import Helper from '../utils/Helper';
import Responses from '../utils/Responses';

/**
 * @class Auth
 * @description A class for user authentication
 * @exports Auth
 */
class Auth {
  /**
   * @method userAuth
   * @description Authenticate a user
   * @static
   * @param {object} req - Request object
   * @param {object} res - Response object
   * @param {object} next
   * @returns {object} JSON response
   * @memberof Auth
   */
  static async userAuth(req, res, next) {
    if (!req.headers.authorization) {
      Responses.setError(401, 'You are not logged in');
      return Responses.send(res);
    }
    const token = req.headers.authorization.split(' ')[1];
    try {
      const decoded = await Helper.verifyToken(token);
      req.user = decoded;
      return next();
    } catch (err) {
      const message = await Auth.getTokenErrorMessage(err);
      Responses.setError(401, message);
      return Responses.send(res);
    }
  }

  /**
   * @method getTokenErrorMessage
   * @description get jwt error message
   * @static
   * @param {object} error - Request object
   * @param {object} next
   * @returns {object} JSON response
   * @memberof Auth
   */
  static getTokenErrorMessage(error) {
    const expMessage = 'your session has expired, please login again';
    const errorMessage = error.message === 'jwt expired' ? expMessage : 'Authentication failed';
    return errorMessage;
  }
}

export default Auth;