I'm using a library called Grant in my application. Previously I have included it following the examples in the readme linked above, however I now have the need to conditionally include it and I can't seem to make it work.
How it worked before
const grant = new Grant(grantConfig);
app.use(grant);
I've done conditional middleware in Express before, so I thought including Grant wouldn't be a problem.
How I Tried (doesn't work)
const grant = new Grant(grantConfig);
app.use((req, res, next) => {
if (someBooleanVariable) {
next();
} else {
grant(req, res, next);
}
});
So this doesn't work. I think it may have something to do with Grant being an instance of Express versus just a regular middleware function, but I'm not sure. You can see how Grant is implemented here. The Express docs say that it should be treated the same, but I might also be misunderstanding them.
Note: I need this to work on per-request basis, hence the middleware style approach.
If you want to use a particular middleware on only a subset of routes:
// On a single route:
app.get('/some/route', grant, function(req, res) {
...
});
// On a set of routes with a particular prefix:
app.use('/api', grant, apiRouter);
// On a specific router:
let apiRouter = express.Router();
apiRouter.use(grant);
apiRouter.get(...);