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demo_session.go
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demo_session.go
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package main
import (
"fmt"
"github.com/gorilla/mux"
"github.com/gorilla/securecookie"
"gopkg.in/mgo.v2"
"gopkg.in/mgo.v2/bson"
"net/http"
"strconv"
)
const indexPage = `
<h1>Logged in as %s</h1>
<form method="post" action="/logout">
<button type="submit">Logout</button>
</form>
<a href="/internal">Internal</a>
`
func indexPageHandler(response http.ResponseWriter, request *http.Request) {
username, nickname, login := getSession(request)
if username != "" && login > 0 {
fmt.Fprintf(response, indexPage, nickname)
} else {
http.Redirect(response, request, "/login", 302)
}
}
const internalPage = `
<h1>Internal</h1>
<hr>
<small>Nickname: %s</small>
<form method="post" action="/logout">
<button type="submit">Logout</button>
</form>
`
func internalPageHandler(response http.ResponseWriter, request *http.Request) {
username, nickname, login := getSession(request)
if username != "" && login > 0 {
fmt.Fprintf(response, internalPage, nickname)
} else {
http.Redirect(response, request, "/login", 302)
}
}
const loginForm = `
<h1>Login</h1>
<form method="post" action="/login">
<label for="name">User name</label>
<input type="text" id="name" name="name">
<label for="password">Password</label>
<input type="password" id="password" name="password">
<button type="submit">Login</button>
</form>
`
type User struct {
Id bson.ObjectId `json:"id" bson:"_id,omitempty"`
Login int `json:"login"` // 0: no right, >0: common right
Nickname string `json:"nickname"` // display name
Username string `json:"username"` // login name
Password string `json:"password"` // login password
}
func connect() (session *mgo.Session) {
connectURL := "localhost"
session, err := mgo.Dial(connectURL)
if err != nil {
fmt.Println("Can't connect to mongo, go error: ", err.Error())
}
session.SetSafe(&mgo.Safe{})
return session
}
func checkUser(username, password string) *User {
session := connect()
defer session.Close()
var user User
db_user := session.DB("kzc").C("user")
cond := bson.M{"username": username, "password": password}
if err := db_user.Find(cond).One(&user); err != nil {
return nil
} else {
return &user
}
}
func loginGetHandler(response http.ResponseWriter, request *http.Request) {
username, _, login := getSession(request)
if username != "" && login > 0 {
http.Redirect(response, request, "/", 302)
} else {
fmt.Fprintf(response, loginForm)
}
}
func loginPostHandler(response http.ResponseWriter, request *http.Request) {
username := request.FormValue("name")
password := request.FormValue("password")
redirectTarget := "/login"
if username != "" && password != "" {
if user := checkUser(username, password); user != nil {
setSession(*user, response)
redirectTarget = "/"
}
}
http.Redirect(response, request, redirectTarget, 302)
}
func logoutHandler(response http.ResponseWriter, request *http.Request) {
clearSession(response)
http.Redirect(response, request, "/", 302)
}
var cookieHandler = securecookie.New(
securecookie.GenerateRandomKey(64),
securecookie.GenerateRandomKey(32))
func setSession(user User, response http.ResponseWriter) {
value := map[string]string{
"username": user.Username,
"nickname": user.Nickname,
"login": strconv.Itoa(user.Login),
}
if encoded, err := cookieHandler.Encode("session", value); err == nil {
cookie := &http.Cookie{
Name: "session",
Value: encoded,
Path: "/",
}
http.SetCookie(response, cookie)
}
}
func getSession(request *http.Request) (username, nickname string, login int) {
if cookie, err := request.Cookie("session"); err == nil {
cookieValue := make(map[string]string)
if err = cookieHandler.Decode("session", cookie.Value, &cookieValue); err == nil {
if login, err = strconv.Atoi(cookieValue["login"]); err != nil {
return
}
username = cookieValue["username"]
nickname = cookieValue["nickname"]
}
}
return
}
func clearSession(response http.ResponseWriter) {
cookie := &http.Cookie{
Name: "session",
Value: "",
Path: "/",
MaxAge: -1,
}
http.SetCookie(response, cookie)
}
func main() {
var router = mux.NewRouter()
router.HandleFunc("/", indexPageHandler)
router.HandleFunc("/internal", internalPageHandler)
router.HandleFunc("/login", loginGetHandler).Methods("GET")
router.HandleFunc("/login", loginPostHandler).Methods("POST")
router.HandleFunc("/logout", logoutHandler).Methods("POST")
http.Handle("/", router)
http.ListenAndServe(":8000", nil)
}