How can I pass data from middleware to handlers?

Question

I am designing my handlers to return a http.Handler. Here\'s the design of my handlers:

 func Handler() http.Handler {
  return http.HandlerFunc(func(w http.         


        

Answer 1

Since you're already using Gorilla take a look at the context package.

(This is nice if you don't want to change your method signatures.)

import (
    "github.com/gorilla/context"
)

...

func Middleware(next http.Handler) http.Handler {
    return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
        // Middleware operations
        // Parse body/get token.
        context.Set(r, "token", token)

        next.ServeHTTP(w, r)
    })
}

...

func Handler() http.Handler {
    return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
        token := context.Get(r, "token")
    })
}