pigallery2/src/backend/routes/ErrorRouter.ts

import { RenderingMWs } from '../middlewares/RenderingMWs';
import { ErrorCodes, ErrorDTO } from '../../common/entities/Error';
import { Logger } from '../Logger';
import { Express, NextFunction, Request, Response } from 'express';

export class ErrorRouter {
  public static route(app: Express): void {
    this.addApiErrorHandler(app);
    this.addGenericHandler(app);
  }

  private static addApiErrorHandler(app: Express): void {
    app.use('/api/*', RenderingMWs.renderError);
  }

  private static addGenericHandler(app: Express): void {
    app.use(
      (err: any, req: Request, res: Response, next: NextFunction): any => {
        if (err.name === 'UnauthorizedError') {
          // jwt authentication error
          res.status(401);
          return next(
            new ErrorDTO(ErrorCodes.NOT_AUTHENTICATED, 'Invalid token')
          );
        }
        if (err.name === 'ForbiddenError' && err.code === 'EBADCSRFTOKEN') {
          // jwt authentication error
          res.status(401);
          return next(
            new ErrorDTO(
              ErrorCodes.NOT_AUTHENTICATED,
              'Invalid CSRF token',
              err,
              req
            )
          );
        }

        console.log(err);

        // Flush out the stack to the console
        Logger.error('Unexpected error:');
        console.error(err);
        return next(
          new ErrorDTO(
            ErrorCodes.SERVER_ERROR,
            'Unknown server side error',
            err,
            req
          )
        );
      },
      RenderingMWs.renderError
    );
  }
}