I have a Node.js restful API. The problem I am having is that I am not sure why I am not able to see the request headers inside the middleware route.use(), however, it is visible inside get method router.get('/',function(req,res){}).
Can you someone please why is this case or what do I have to do get it visible inside
router.use(function(req,res,next){ next();});
Try something like his
router.use(function (req, res, next) {
console.log(req.headers['header_name']);
if (!req.headers['header_name']) return next('router')
next()
})
To skip the rest of the router’s middleware functions, call next('router') to pass control back out of the router instance.
Related
I've got a fairly straight forward Node Express routing app set up, to which I've just added passport.js authentication. I'm now trying to integrate this with the existing routes.
I run the basic middleware of:
app.use(passport.initialize());
app.use(passport.session());
and then if I run a simple
app.get('/route', (req, res)=>{
console.log(req.user)
});
I get the expected result of it printing the logged in user. So far so good...
However, I'm now trying to access this req.user within some of the child routes that I have set up. In the first route I'm trying the first step is to bring in a parameter and compare it against the req.user:
app.use('/route/:userId', idRouter);
And then:
idRouter.param("userId", async (req, res, next, userId) => {
console.log(userId)
console.log(req.user.id)
})
This route fires and prints out the parameter, but req.user is undefined. I can't see a reason why this is the case.
To help debug this I've put some logging in the deserialize function and I can see that it's not being called when I hit the idRouter. I can't see why this would be the case given it's inside an app.use function which should be called every time.
Help please!
I solved this in the end, it was an issue with CORS. Just needed to include credentials in API calls.
In my NodeJs/express based application, I am authorizing calls to all the endpoints by using the following middleware.
app.use(restrictByCookieMiddleware);
I want to authorize all endpoints except one i.e. I don't want "restrictByCookieMiddleware" middleware to run for "/metrics" endpoint. Is there a way to escape one endpoint?
Here, I found some examples that matches endpoint for which middleware should run, I am looking for a solution that skips one.
Your have a couple of choices:
First, you can just define the one exception route handler BEFORE the middleware. Then, it will handle that route and the routing will never get to the middleware.
app.get("/login", (req, res) => {
// handle that one special route here
});
// all other routes will get this middleware
app.use(restrictByCookieMiddleware);
Second, you can make a wrapper for the middleware that compares to the one specific route and skips the middleware if it's that route:
app.use((req, res, next) => {
// shortcircuit the /login path so it doesn't call the middleware
if (req.path === "/login") {
next();
} else {
restrictByCookieMiddleware(req, res, next);
}
});
// then, somewhere else in your code would be the /login route
app.get("/login", ...);
Third, if you have multiple routes that you want to skip the middleware for, you can segment things by router. Create a router for the non-middleware routes and put all of them on that router. Hook that router into the app object first.
Then, create a second router that contains the middleware and has all your other routes on it.
Place that specific route, you want to exclude, before this line:
app.use(restrictByCookieMiddleware);
So this will solve your problem.
I'm doing an API in nodejs with express as router.
Now i'm trying to implement an client-id and an apikey to add some security to the API, and the problem that i'm facing is the next:
One of my API call is like this:
router.get("roles/get-objects/:mail/:filter*?")
So this means, that i can request an object like this:
/roles/get-objects/mail#mail.com/customer
Now the tricky part begins... when I needed to stablish a middleware to read an client-id and an apikey to verify that the client is authorized to se the API, so I did this:
In the declaration of the middleware, I use this wildcard:
router.all('/*', function (req, res, next) {
XXXX})
The thing is, I have tried in the middleware, as a wildcard everything...
I want that any API call is filtered thru that middleware, but apparently I can't find the right wildcard for it...
When I use /roles/* as wildcard, if I do a request to /roles it does work, but when I use the complete URL like: /roles/get-objects/mail#mail.com/customer it doesn't go thru my middleware.
So anybody has any idea? i'm starting to loose my mind
Thank you so much to all of you!
EDIT:
Now i'm using this middleware declaration:
router.use(function (req, res, next) {XXXX})
So when I call:
/roles/get-objects/
It's executed, the problem is when I add the email to the route:
/roles/get-objects/mail#mail.com
The app goes directly to the route that i have for that, but omits my middleware:
router.get("roles/get-objects/:mail",
I don't understand why is this happening, apparently everything should go thru my middleware first, or am I wrong?
If you want to establish a middleware to check all HTTP request whose URL starting with /roles/, the middleware should be placed before any other specific router definition:
router.use('/roles', function(req, res, next) {...});
...
router.get('/roles/get-objects/:mail', ...);
If the middleware is defined after specific route, when HTTP request comes in, the specific route is targeted and processed, the middleware won't be executed any more:
router.get('/roles/get-objects/:mail', ...);
...
router.use('/roles', function(req, res, next) {...}); // This middleware logic won't execute when request is sent to '/roles/get-objects/some-email', as the request has already been handled and response is already sent to browser.
The typical middleware in express is used before the request hits the routes, for example there's authentication first, then the code of the specific route is executed, then the response is sent.
I am wondering whether it is possible to have a thing like a middleware after a route is hit.
Say I have five routes that all respond with some json and I wanted to log the sent json everytime one of the routes is hit.
I could go and log manually everytime I send a response in a route, like this:
console.log(data);
res.json(data);
but this seems redundant to me. A better approach could be to wrap that in a function to call in the route, but that would require to pass the response object everytime like this:
/* instead of the above */
send(data, res);
/* and then somewhere else usable for all routes */
function send(data, res) {
console.log(data);
res.json(data);
}
this also seems a bit like bad practice to me, so I'm wondering whether this would be the preferred way or if there's a way to use some kind of 'middleware', which would allow to send the response in the usual way and hook in after that.
It is not really possible to attach a middleware which executes after the route, but you can execute a middleware, which binds a finish event on response,
app.use(function(req, res, next){
res.on('finish', function(){
// Do whatever you want this will execute when response is finished
});
next();
});
also https://stackoverflow.com/a/21858212/3556874
I have a simple app, built with the help of node.js and express. This app has multiple routes and basic login/logout mechanics. I want all routes to redirect to a login form if the user is NOT logged in. This can be done by inserting auth checker lines into each route file.
The question is :
Is it possible to chain the routes to push all requests through login checker route and then pass it to the requested one without writing anything to existing route files?
E.g. existing routes are "/", "/upload", "/login", "/logout".
I want the request to get or post "/upload" to be first processed by "/login" route and then by "upload" route.
Yes, you can chain handlers in a route. Your handler definition should be like
routehandler(req, res, next){
//send response directly
//or call next to call the next handler
}
You can then put multiple handlers in the order you want:
app.get('/server', ensureAuthenticated, housekeeping, routes.server.get)
Here ensureAuthenticated and housekeeping dont send the response just call next(). The last one returns the resulting page.
Please see you would want a different handler than what you use for login. Login page would do authentication, rest pages should just check if the user is authenticated or not. The difference would be clear if you are using sessions.
The args for the route handlers are the same as that of middlewares. Those are :
(err, req, res, next) Error handlers
(req, res, next) Non-error handlers
A trivial variation of above is that next can be left out if it is the end function you want in callback chain. You cannot have other args apart from these. You can see the how they are called here (line 154).
A route consists of method, route-match and callback array. Like the middlewares the callback chain is executed sequentially for a specific route until response is returned or error is thrown.