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import BasicAuthenticator from 'umn-shib-nodejs';
import { Request, Response, NextFunction } from 'express';
/**
* Express Middleware to check if the user is authenticated with Shibboleth, wraps {@link isLoggedIn}
* @param req Express request object
* @param res Express response object
* @param next Express next function
*/
export default function saml(
req: Request,
res: Response,
next: NextFunction
): void {
const authenticator = new BasicAuthenticator(req, res);
if (isLoggedIn(req)) next();
else res.redirect(authenticator.buildLoginURL());
}
/**
* A much simpler way to respond to a user that is not logged in for API calls.
* @param req Express request object
* @param res Express response object
* @param next Express next function
*/
export function saml_api(
req: Request,
res: Response,
next: NextFunction
): void {
if (isLoggedIn(req)) next();
else res.status(401).json({ error: 'Not logged in.' });
}
/**
* Rudimentary check to see if the user is logged in by checking if the user has a session cookie
* @param req Express request object
* @returns true if the user is logged in, false otherwise
*/
function isLoggedIn(req: Request): boolean {
/*
Shibboleth token always contains _shibsession_, so we can check for that
Is this a good way to check if the user is logged in?
Not even slightly.
But it works.
*/
const cookies = JSON.stringify(req.cookies);
return cookies.includes('_shibsession_');
}
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