Files
golias/handlers/auth.go
2025-05-02 09:06:17 +03:00

116 lines
2.8 KiB
Go

package handlers
import (
"crypto/hmac"
"crypto/sha256"
"encoding/base64"
"encoding/json"
"golias/models"
"golias/utils"
"html/template"
"log/slog"
"net/http"
"strings"
"time"
)
func abortWithError(w http.ResponseWriter, msg string) {
tmpl := template.Must(template.ParseGlob("components/*.html"))
tmpl.ExecuteTemplate(w, "error", msg)
}
func HandleFrontLogin(w http.ResponseWriter, r *http.Request) {
r.ParseForm()
username := r.PostFormValue("username")
if username == "" {
msg := "username not provided"
slog.Error(msg)
abortWithError(w, msg)
return
}
// make sure username does not exists
cleanName := utils.RemoveSpacesFromStr(username)
// TODO: create user in db
// login user
cookie, err := makeCookie(cleanName, r.RemoteAddr)
if err != nil {
slog.Error("failed to login", "error", err)
abortWithError(w, err.Error())
return
}
http.SetCookie(w, cookie)
tmpl, err := template.ParseGlob("components/*.html")
if err != nil {
abortWithError(w, err.Error())
return
}
tmpl.ExecuteTemplate(w, "main", nil)
}
func makeCookie(username string, remote string) (*http.Cookie, error) {
// secret
// Create a new random session token
// sessionToken := xid.New().String()
sessionToken := "token"
expiresAt := time.Now().Add(time.Duration(cfg.SessionLifetime) * time.Second)
// Set the token in the session map, along with the session information
session := &models.Session{
Username: username,
Expiry: expiresAt,
}
cookieName := "session_token"
// hmac to protect cookies
hm := hmac.New(sha256.New, []byte(cfg.CookieSecret))
hm.Write([]byte(cookieName))
hm.Write([]byte(sessionToken))
signature := hm.Sum(nil)
// b64 enc to avoid non-ascii
cookieValue := base64.URLEncoding.EncodeToString([]byte(
string(signature) + sessionToken))
cookie := &http.Cookie{
Name: cookieName,
Value: cookieValue,
Secure: true,
HttpOnly: true,
SameSite: http.SameSiteNoneMode,
Domain: cfg.ServerConfig.Host,
}
slog.Info("check remote addr for cookie set",
"remote", remote, "session", session)
if strings.Contains(remote, "192.168.0") {
// no idea what is going on
// cookie.Domain = "192.168.0.15"
cookie.Domain = "home.host"
slog.Info("changing cookie domain", "domain", cookie.Domain)
}
// set ctx?
// set user in session
if err := cacheSetSession(sessionToken, session); err != nil {
return nil, err
}
return cookie, nil
}
func cacheGetSession(key string) (*models.Session, error) {
userSessionB, err := memcache.Get(key)
if err != nil {
return nil, err
}
var us *models.Session
if err := json.Unmarshal(userSessionB, &us); err != nil {
return nil, err
}
return us, nil
}
func cacheSetSession(key string, session *models.Session) error {
sesb, err := json.Marshal(session)
if err != nil {
return err
}
memcache.Set(key, sesb)
// expire in 10 min
memcache.Expire(key, 10*60)
return nil
}