104 lines
2.9 KiB
Go
104 lines
2.9 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 auth provides handlers to enable basic auth support.
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// Simple Usage:
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// import(
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// "github.com/astaxie/beego"
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// "github.com/astaxie/beego/plugins/auth"
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// )
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//
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// func main(){
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// // authenticate every request
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// beego.InsertFilter("*", beego.BeforeRouter,auth.Basic("username","secretpassword"))
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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 SecretAuth(username, password string) bool {
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// return username == "astaxie" && password == "helloBeego"
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// }
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// authPlugin := auth.NewBasicAuthenticator(SecretAuth, "Authorization Required")
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// beego.InsertFilter("*", beego.BeforeRouter,authPlugin)
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package auth
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import (
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"encoding/base64"
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"net/http"
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"strings"
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"github.com/astaxie/beego"
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"github.com/astaxie/beego/context"
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)
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var defaultRealm = "Authorization Required"
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func Basic(username string, password string) beego.FilterFunc {
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secrets := func(user, pass string) bool {
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return user == username && pass == password
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}
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return NewBasicAuthenticator(secrets, defaultRealm)
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}
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func NewBasicAuthenticator(secrets SecretProvider, Realm string) beego.FilterFunc {
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return func(ctx *context.Context) {
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a := &BasicAuth{Secrets: secrets, Realm: Realm}
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if username := a.CheckAuth(ctx.Request); username == "" {
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a.RequireAuth(ctx.ResponseWriter, ctx.Request)
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}
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}
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}
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type SecretProvider func(user, pass string) bool
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type BasicAuth struct {
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Secrets SecretProvider
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Realm string
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}
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//Checks the username/password combination from the request. Returns
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//either an empty string (authentication failed) or the name of the
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//authenticated user.
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//Supports MD5 and SHA1 password entries
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func (a *BasicAuth) CheckAuth(r *http.Request) string {
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s := strings.SplitN(r.Header.Get("Authorization"), " ", 2)
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if len(s) != 2 || s[0] != "Basic" {
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return ""
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}
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b, err := base64.StdEncoding.DecodeString(s[1])
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if err != nil {
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return ""
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}
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pair := strings.SplitN(string(b), ":", 2)
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if len(pair) != 2 {
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return ""
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}
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if a.Secrets(pair[0], pair[1]) {
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return pair[0]
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}
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return ""
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}
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//http.Handler for BasicAuth which initiates the authentication process
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//(or requires reauthentication).
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func (a *BasicAuth) RequireAuth(w http.ResponseWriter, r *http.Request) {
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w.Header().Set("WWW-Authenticate", `Basic realm="`+a.Realm+`"`)
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w.WriteHeader(401)
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w.Write([]byte("401 Unauthorized\n"))
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}
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