Negroni-authz 
Negroni-authz is an authorization middleware for Negroni, it's based on https://github.com/casbin/casbin.
Installation
go get github.com/casbin/negroni-authz
Simple Example
package main
import (
"fmt"
"net/http"
"github.com/casbin/casbin"
"github.com/casbin/negroni-authz"
"github.com/urfave/negroni"
)
func main() {
mux := http.NewServeMux()
mux.HandleFunc("/", func(w http.ResponseWriter, req *http.Request) {
fmt.Fprintf(w, "Welcome to the home page!")
})
n := negroni.Classic()
// load the casbin model and policy from files, database is also supported.
e := casbin.NewEnforcer("authz_model.conf", "authz_policy.csv")
n.Use(authz.Authorizer(e))
http.ListenAndServe(":3000", n)
}
How to control the access
The authorization determines a request based on {subject, object, action}, which means what subject can perform what action on what object. In this plugin, the meanings are:
subject: the logged-on user nameobject: the URL path for the web resource like "dataset1/item1"action: HTTP method like GET, POST, PUT, DELETE, or the high-level actions you defined like "read-file", "write-blog"
For how to write authorization policy and other details, please refer to the Casbin's documentation.
Getting Help
License
This project is under MIT License. See the LICENSE file for the full license text.