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