Lithium/auth/authorization.go

package auth

import (
	"net/http"
	"strings"
)

type AuthenticationMiddleware struct {
	secret string
}

func (middleware AuthenticationMiddleware) Middleware(next http.Handler) http.Handler {
	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		authToken := r.Header.Get("Authorization")

		if authToken == "" || strings.HasPrefix(authToken, "Bearer ") == false || authToken[7:] != middleware.secret {
			http.Error(w, "Forbidden", http.StatusForbidden)
		} else {
			next.ServeHTTP(w, r)
		}
	})
}

func CreateAuthenticationMiddleware(secret string) AuthenticationMiddleware {
	return AuthenticationMiddleware{
		secret,
	}
}