Disable middleware for some api

[abbasnaqdi]

Hi, I need to deactivate middleware in some api.

For example, I need to disable the auth user registry and use auth for other operations after the registry.

But in mux using r.Use (), all routers require auth operations.
How can I fix this problem ?

[elithrar]

https://godoc.org/github.com/gorilla/mux#Router.PathPrefix

• You can use r.PathPrefix(“/prefix”).Subrouter() to create a subrouter that only has specific middleware applied.

• Alternatively, your middleware can take a list of paths to skip.

[bminer]

Might be good to note this in the docs. It is not entirely clear that r.PathPrefix bypasses the middleware set in r.Use. Thoughts?

[bminer]

Perhaps this behavior was changed after #431?

[vituchon]

Hi @bminer, allow me to share an approach to tackle a quite similar scenario...

scenario
assuming i got one endpoint for login purposes "/api/v1/user-login" (there is no sense to apply a a validation check)
and several endpoints for authenticated operations that requires to check if the client is validated, all of them with the following prefix "/api/v1/", for example "/api/v1/users" (to list all the users)

solution

func main() {
	r := mux.NewRouter()
	r.Path("/api/v1/user-login").Handler(http.HandlerFunc(UserLoginHandler))   // /api/v1/user-login will be NOT intercepted by ValidationMiddleWare
	api := r.PathPrefix("/api/v1").Subrouter()
	api.Use(ValidationMiddleware)
	api.Path("/users").Handler(http.HandlerFunc(UsersHandler)) // api/v1/users will be intercepted by ValidationMiddleWare
	
        ...

The trick is to define the fully qualified path "/api/v1/user-login" in the base route r, and then use the api subrouter for register the endspoints that requires a validation check.

Well, this work OK for me and hope it helps!
Also if there is some flaw or code smell, please notify me! i would be thankful!

Greetings
Víctor