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session.go
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session.go
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package main
import (
"fmt"
"log"
"net/http"
"github.com/gorilla/sessions"
)
var (
// key must be 16, 24 or 32 bytes long (AES-128, AES-192 or AES-256)
key = []byte("super-secret-key")
store = sessions.NewCookieStore(key)
)
func secret(w http.ResponseWriter, r *http.Request) {
session, _ := store.Get(r, "sessionID")
// Check if user is authenticated
if auth, ok := session.Values["authenticated"].(bool); !ok || !auth {
http.Error(w, "Forbidden", http.StatusForbidden)
return
}
// Print secret message
fmt.Fprintln(w, "The cake is a lie!")
}
func login(w http.ResponseWriter, r *http.Request) {
session, _ := store.Get(r, "sessionID")
if session.IsNew {
log.Println("New session started: ", session)
}
// Authentication goes here
// ...
// Set user as authenticated
session.Values["authenticated"] = true
err := session.Save(r, w)
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
}
func logout(w http.ResponseWriter, r *http.Request) {
session, _ := store.Get(r, "sessionID")
// Revoke users authentication
session.Values["authenticated"] = false
session.Save(r, w)
}
func main() {
http.HandleFunc("/secret", secret)
http.HandleFunc("/login", login)
http.HandleFunc("/logout", logout)
http.ListenAndServe(":8080", nil)
}