我有一个简单的聊天服务器，由于某种原因，http.Redirect功能并没有真正起作用。问题是，而不是实际上将我重定向到＆＃39; / login＆＃39;它提供了一个带有/ login链接的html页面。这很烦人，因为没有CSS存在而且看起来很难看。
func static(w http.ResponseWriter, r *http.Request) {
//check backend
if user, err := aaa.CurrentUser(w, r); err == nil {
//user is logged in
log.Println(user)
vars := mux.Vars(r)
page := vars["page"]
data, _ := ioutil.ReadFile("downloads/" + page)
w.Write(data)
return
}else {
//user is not logged in
http.Redirect(w,r,"/login",http.StatusUnauthorized)
w.Write([]byte("<script>alert('Please login')</script>"))
return
}
}
例如，当用户未登录时，会出现javascript警报并将我带到此页面<a href="/login">Unauthorized</a>.这就是所有html页面包含的内容。只是单个href没有标题，没有。
只是在case-main.go代码中（应该足够）
package main
import (
"flag"
"fmt"
"html/template"
"io/ioutil"
"log"
"net/http"
"os"
"strings"
"strconv"
"time"
"github.com/apexskier/httpauth"
"github.com/gorilla/mux"
"runtime"
)
var (
backend httpauth.LeveldbAuthBackend
aaa httpauth.Authorizer
roles map[string]httpauth.Role
port = 80
backendfile = "auth.leveldb"
)
func static(w http.ResponseWriter, r *http.Request) {
if user, err := aaa.CurrentUser(w, r); err == nil {
log.Println(user)
vars := mux.Vars(r)
page := vars["page"]
data, _ := ioutil.ReadFile("downloads/" + page)
w.Write(data)
return
}else {
w.Write([]byte("<script>alert('Please login')</script>"))
http.Redirect(w,r,"/login",http.StatusUnauthorized)
return
}
}
func main() {
runtime.GOMAXPROCS(runtime.NumCPU())
var err error
os.Mkdir(backendfile, 0755)
defer os.Remove(backendfile)
// create the backend
backend, err = httpauth.NewLeveldbAuthBackend(backendfile)
if err != nil {
panic(err)
}
// create some default roles
roles = make(map[string]httpauth.Role)
roles["user"] = 30
roles["admin"] = 80
aaa, err = httpauth.NewAuthorizer(backend, []byte("cookie-encryption-key"), "user", roles)
// create a default user
username := "admin"
defaultUser := httpauth.UserData{Username: username, Role: "admin"}
err = backend.SaveUser(defaultUser)
if err != nil {
panic(err)
}
// Update user with a password and email address
err = aaa.Update(nil, nil, username, "adminadmin", "admin@localhost.com")
if err != nil {
panic(err)
}
// set up routers and route handlers
flag.Parse()
hub := newHub()
go hub.run()
r := mux.NewRouter()
r.HandleFunc("/chat", serveChat)
r.HandleFunc("/ws", func(w http.ResponseWriter, r *http.Request) {
serveWs(hub, w, r)
})
r.HandleFunc("/downloads/{page}", static)
http.Handle("/www/", http.StripPrefix("/www/", http.FileServer(http.Dir("./www"))))
r.HandleFunc("/login", getLogin).Methods("GET")
r.HandleFunc("/register", postRegister).Methods("POST")
r.HandleFunc("/register", getRegister).Methods("GET")
r.HandleFunc("/login", postLogin).Methods("POST")
r.HandleFunc("/admin", handleAdmin).Methods("GET")
r.HandleFunc("/add_user", postAddUser).Methods("POST")
r.HandleFunc("/change", postChange).Methods("POST")
r.HandleFunc("/", handlePage).Methods("GET") // authorized page
r.HandleFunc("/logout", handleLogout)
r.HandleFunc("/home", homeHandle).Methods("GET")
http.Handle("/", r)
fmt.Printf("Server running on port %d\n", port)
srv:=&http.Server {
Addr: ":"+strconv.Itoa(port),
ReadTimeout: 10* time.Second,
WriteTimeout: 10*time.Second,
MaxHeaderBytes: 1<<20,
}
srv.ListenAndServe()
}
func serveChat(w http.ResponseWriter, r *http.Request) {
if user, err := aaa.CurrentUser(w, r); err == nil {
log.Println(r.URL)
log.Println(user)
w.Header().Set("Content-Type", "text/html; charset=utf-8")
chatt, _ := template.New("member").Parse(chat)
chatt.Execute(w, r.Host)
return
} else {
http.Redirect(w, r, "/login", http.StatusUnauthorized)
return
}
}
type Page struct {
USER httpauth.UserData
}
func homeHandle(w http.ResponseWriter, r *http.Request) {
if user, err := aaa.CurrentUser(w, r); err == nil {
type data struct {
User httpauth.UserData
Roles map[string]httpauth.Role
Users []httpauth.UserData
Msg []string
}
messages := aaa.Messages(w, r)
users, err := backend.Users()
if err != nil {
panic(err)
}
d := data{User: user, Roles: roles, Users: users, Msg: messages}
homet, _ := template.New("member").Parse(member)
homet.Execute(w, d)
return
} else {
http.Redirect(w, r, "/login", http.StatusUnauthorized)
return
}
}
func getRegister(w http.ResponseWriter, r *http.Request) {
fmt.Fprintf(w, register)
return
}
func getLogin(rw http.ResponseWriter, req *http.Request) {
fmt.Fprintf(rw, login)
return
}
func postLogin(rw http.ResponseWriter, req *http.Request) {
username := req.PostFormValue("username")
password := req.PostFormValue("password")
if err := aaa.Login(rw, req, username, password, "/home"); err == nil || (err != nil && strings.Contains(err.Error(), "already authenticated")) {
http.Redirect(rw, req, "/home", http.StatusSeeOther)
return
} else if err != nil {
fmt.Println(err)
http.Redirect(rw, req, "/login", http.StatusSeeOther)
return
}
}
func postRegister(rw http.ResponseWriter, req *http.Request) {
var user httpauth.UserData
user.Username = req.PostFormValue("username")
user.Email = req.PostFormValue("email")
password := req.PostFormValue("password")
if err := aaa.Register(rw, req, user, password); err == nil {
postLogin(rw, req)
return
} else {
http.Redirect(rw, req, "/login", http.StatusSeeOther)
return
}
}
func postAddUser(rw http.ResponseWriter, req *http.Request) {
var user httpauth.UserData
user.Username = req.PostFormValue("username")
user.Email = req.PostFormValue("email")
password := req.PostFormValue("password")
user.Role = req.PostFormValue("role")
if err := aaa.Register(rw, req, user, password); err != nil {
// maybe something
}
http.Redirect(rw, req, "/admin", http.StatusSeeOther)
return
}
func postChange(rw http.ResponseWriter, req *http.Request) {
email := req.PostFormValue("new_email")
aaa.Update(rw, req, "", "", email)
http.Redirect(rw, req, "/", http.StatusSeeOther)
return
}
func handlePage(rw http.ResponseWriter, req *http.Request) {
rw.Write([]byte(index))
return
}
func handleAdmin(rw http.ResponseWriter, req *http.Request) {
if err := aaa.AuthorizeRole(rw, req, "admin", true); err != nil {
fmt.Println(err)
http.Redirect(rw, req, "/login", http.StatusSeeOther)
return
}
if user, err := aaa.CurrentUser(rw, req); err == nil {
type data struct {
User httpauth.UserData
Roles map[string]httpauth.Role
Users []httpauth.UserData
Msg []string
}
messages := aaa.Messages(rw, req)
users, err := backend.Users()
if err != nil {
panic(err)
}
d := data{User: user, Roles: roles, Users: users, Msg: messages}
t, err := template.New("admin").Parse(admin)
if err != nil {
panic(err)
}
t.Execute(rw, d)
return
}
}
func handleLogout(rw http.ResponseWriter, req *http.Request) {
if err := aaa.Logout(rw, req); err != nil {
fmt.Println(err)
// this shouldn't happen
return
}
http.Redirect(rw, req, "/", http.StatusSeeOther)
return
}
答案 0 :(得分：4)
http.Redirect，因此请将其放在w.Write之前：
}else {
//user is not logged in
http.Redirect(w,r,"/login",http.StatusUnauthorized)
w.Write([]byte("<script>alert('Please login')</script>"))
return
}