Add an authorization plugin that supports ACL, RBAC based on casbin. It requires the built-in HTTP basic authentication by default.

plugins/authz/authz.go

@@ -0,0 +1,86 @@
+// Copyright 2014 beego Author. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// Package authz provides handlers to enable ACL, RBAC, ABAC authorization support.
+// Simple Usage:
+//	import(
+//		"github.com/astaxie/beego"
+//		"github.com/astaxie/beego/plugins/authz"
+//		"github.com/hsluoyz/casbin"
+//	)
+//
+//	func main(){
+//		// mediate the access for every request
+//		beego.InsertFilter("*", beego.BeforeRouter, authz.NewAuthorizer(casbin.NewEnforcer("authz_model.conf", "authz_policy.csv")))
+//		beego.Run()
+//	}
+//
+//
+// Advanced Usage:
+//
+//	func main(){
+//		e := casbin.NewEnforcer("authz_model.conf", "")
+//		e.AddRoleForUser("alice", "admin")
+//		e.AddPolicy(...)
+//
+//		beego.InsertFilter("*", beego.BeforeRouter, authz.NewAuthorizer(e))
+//		beego.Run()
+//	}
+package authz
+
+import (
+	"github.com/astaxie/beego"
+	"github.com/astaxie/beego/context"
+	"github.com/hsluoyz/casbin"
+	"net/http"
+)
+
+// NewAuthorizer returns the authorizer.
+// Use a casbin enforcer as input
+func NewAuthorizer(e *casbin.Enforcer) beego.FilterFunc {
+	return func(ctx *context.Context) {
+		a := &BasicAuthorizer{enforcer: e}
+
+		if !a.CheckPermission(ctx.Request) {
+			a.RequirePermission(ctx.ResponseWriter)
+		}
+	}
+}
+
+// BasicAuthorizer stores the casbin handler
+type BasicAuthorizer struct {
+	enforcer *casbin.Enforcer
+}
+
+// GetUserName gets the user name from the request.
+// Currently, only HTTP basic authentication is supported
+func (a *BasicAuthorizer) GetUserName(r *http.Request) string {
+	username, _, _ := r.BasicAuth()
+	return username
+}
+
+// CheckPermission checks the user/method/path combination from the request.
+// Returns true (permission granted) or false (permission forbidden)
+func (a *BasicAuthorizer) CheckPermission(r *http.Request) bool {
+	user := a.GetUserName(r)
+	method := r.Method
+	path := r.URL.Path
+	return a.enforcer.Enforce(user, path, method)
+}
+
+// RequirePermission returns the 403 Forbidden to the client
+func (a *BasicAuthorizer) RequirePermission(w http.ResponseWriter) {
+	w.WriteHeader(403)
+	w.Write([]byte("403 Forbidden\n"))
+}