I'm trying to get the names of middleware functions in a particular request route. Let's say I have the following code implemented:
const authorizeRoute = (req,res,next) => {
let nextFunctionName = SomeFunctionToRetrieveTheNameOfTheNextMiddlewareToBeCalled()
if (isUserAuthorized(req.user.id, nextFunctionName)) next()
}
app.use(authorizeRoute)
app.get("/users", controller.getUsers)
app.get("/users/:id/posts", controller.getUserPosts)
I want the authorizeRoute middleware to be able to get the name of the middleware function to be called next in the stack.
Like, if there's a GET request to "/users", I want the nextFunctionName to have the value of "getUsers" or "controller.getUsers" or something similar.
Or GET "/users/:id/posts" have the same nextFunctionName to be "getUserPosts" or something.
How will I do this?
I'm still new to Express and Node or even javascript. How would I go about doing this?
I know this is possible somehow because there's already a way to get the function name as a string in javascript.
someFunction.name // gives "someFunction" returned as a string
So I know it can be done. I just don't know, how.
P.S. I know there are alternate ways of accomplishing the desired effect, but my need for this is not exactly reflected in the above snippet, but I tried my best to have it showcased.
figured it out. I can't put the middleware to get the stack for a route using app.use but if the middleware is put among the handlers for the route, it will work.
const SomeFunctionToRetrieveTheNameOfTheLastMiddleware(req) => {
let stack = req.route.stack
return stack[stack.length-1].name
}
const authorizeRoute = (req,res,next) => {
let nextFunctionName = SomeFunctionToRetrieveTheNameOfTheLastMiddleware(req)
if (isUserAuthorized(req.user.id, nextFunctionName)) next()
}
app.get("/users", authorizeRoute, controller.getUsers)
app.get("/users/:id/posts", authorizeRoute, controller.getUserPosts)
I had the answer to the question in the question itself 😐
You don't want to do something that dynamic, keep it simple. Why not just do this:
const nextFunctionName = (user)=>{
// blah blah blah (something synchronous not asynchronous)
}
const authorizeRoute = (req,res,next) => {
if (isUserAuthorized(req.user?.id)){
nextFunctionName(req.user)
}
next()
}
but it seems like you actually just want to do this:
const nextFunctionName = (user, next)=>{
// blah blah blah
next();
}
const authorizeRoute = (user, next) => {
if (isUserAuthorized(user.id)){
nextFunctionName(user, next); // pass in the next callback
} else {
next()
}
}