refactor: reorganize project structure following go standards

api/auth/handler.go

@@ -0,0 +1,56 @@
+package auth
+
+import (
+	"net/http"
+
+	"mal/web/templates"
+)
+
+type Handler struct {
+	authService *Service
+}
+
+const rateLimitFormError = "Too many attempts in a short time. Please wait a minute and try again."
+
+func NewHandler(authService *Service) *Handler {
+	return &Handler{authService: authService}
+}
+
+func rateLimitErrorFromQuery(r *http.Request) string {
+	if r.URL.Query().Get("error") == "rate_limited" {
+		return rateLimitFormError
+	}
+
+	return ""
+}
+
+func (h *Handler) HandleLogin(w http.ResponseWriter, r *http.Request) {
+	if err := r.ParseForm(); err != nil {
+		templates.Login("Something went wrong. Please try again.", "").Render(r.Context(), w)
+		return
+	}
+
+	username := r.FormValue("username")
+	password := r.FormValue("password")
+
+	if username == "" || password == "" {
+		templates.Login("The email or password is wrong.", username).Render(r.Context(), w)
+		return
+	}
+
+	session, err := h.authService.Login(r.Context(), username, password)
+	if err != nil {
+		templates.Login("The email or password is wrong.", username).Render(r.Context(), w)
+		return
+	}
+
+	SetSessionCookie(w, session.ID, session.ExpiresAt)
+
+	// HTMX-friendly redirect to root or previous page
+	w.Header().Set("HX-Redirect", "/")
+	http.Redirect(w, r, "/", http.StatusFound)
+}
+
+func (h *Handler) HandleLoginPage(w http.ResponseWriter, r *http.Request) {
+	templates.Login(rateLimitErrorFromQuery(r), "").Render(r.Context(), w)
+}