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package auth
import (
"html/template"
"log"
"net/http"
"github.com/alexedwards/scs/v2"
)
// Handlers provides HTTP handlers for authentication
type Handlers struct {
service *Service
sessions *scs.SessionManager
middleware *Middleware
templates *template.Template
}
// NewHandlers creates new auth handlers
func NewHandlers(service *Service, sessions *scs.SessionManager, templates *template.Template) *Handlers {
return &Handlers{
service: service,
sessions: sessions,
middleware: NewMiddleware(sessions),
templates: templates,
}
}
// Middleware returns the auth middleware for use in routes
func (h *Handlers) Middleware() *Middleware {
return h.middleware
}
// HandleLoginPage renders the login form
func (h *Handlers) HandleLoginPage(w http.ResponseWriter, r *http.Request) {
// If already logged in, redirect to dashboard
if h.middleware.IsAuthenticated(r) {
http.Redirect(w, r, "/", http.StatusSeeOther)
return
}
data := struct {
Error string
CSRFToken string
}{
Error: "",
CSRFToken: h.middleware.GetCSRFToken(r),
}
if err := h.templates.ExecuteTemplate(w, "login.html", data); err != nil {
http.Error(w, "Failed to render template", http.StatusInternalServerError)
log.Printf("Error rendering login template: %v", err)
}
}
// HandleLogin processes login form submission
func (h *Handlers) HandleLogin(w http.ResponseWriter, r *http.Request) {
if err := r.ParseForm(); err != nil {
http.Error(w, "Failed to parse form", http.StatusBadRequest)
return
}
username := r.FormValue("username")
password := r.FormValue("password")
if username == "" || password == "" {
h.renderLoginError(w, r, "Username and password are required")
return
}
user, err := h.service.Authenticate(username, password)
if err != nil {
log.Printf("Login failed for user %s: %v", username, err)
h.renderLoginError(w, r, "Invalid username or password")
return
}
// Regenerate session token to prevent session fixation
if err := h.sessions.RenewToken(r.Context()); err != nil {
http.Error(w, "Failed to create session", http.StatusInternalServerError)
log.Printf("Failed to renew session token: %v", err)
return
}
// Set user ID in session
h.middleware.SetUserID(r, user.ID)
log.Printf("User %s logged in successfully", username)
http.Redirect(w, r, "/", http.StatusSeeOther)
}
// HandleLogout processes logout
func (h *Handlers) HandleLogout(w http.ResponseWriter, r *http.Request) {
if err := h.middleware.ClearSession(r); err != nil {
log.Printf("Error clearing session: %v", err)
}
http.Redirect(w, r, "/login", http.StatusSeeOther)
}
func (h *Handlers) renderLoginError(w http.ResponseWriter, r *http.Request, errorMsg string) {
data := struct {
Error string
CSRFToken string
}{
Error: errorMsg,
CSRFToken: h.middleware.GetCSRFToken(r),
}
w.WriteHeader(http.StatusUnauthorized)
if err := h.templates.ExecuteTemplate(w, "login.html", data); err != nil {
http.Error(w, "Failed to render template", http.StatusInternalServerError)
log.Printf("Error rendering login template: %v", err)
}
}
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