feat: migrate auth module to modular domain pattern

internal/auth/handler/handler.go

@@ -0,0 +1,58 @@
+package handler
+
+import (
+	"mal/internal/domain"
+	"mal/internal/server"
+	"net/http"
+	"time"
+
+	"github.com/gin-gonic/gin"
+)
+
+type AuthHandler struct {
+	svc domain.AuthService
+}
+
+func NewAuthHandler(svc domain.AuthService) *AuthHandler {
+	return &AuthHandler{svc: svc}
+}
+
+func (h *AuthHandler) Register(r *gin.Engine) {
+	r.GET("/login", h.HandleLoginPage)
+	r.POST("/login", h.HandleLogin)
+	r.GET("/logout", h.HandleLogout)
+}
+
+func (h *AuthHandler) HandleLoginPage(c *gin.Context) {
+	c.HTML(http.StatusOK, "login.gohtml", gin.H{
+		"CurrentPath": "/login",
+	})
+}
+
+func (h *AuthHandler) HandleLogin(c *gin.Context) {
+	username := c.PostForm("username")
+	password := c.PostForm("password")
+
+	session, err := h.svc.Login(c.Request.Context(), username, password)
+	if err != nil {
+		c.HTML(http.StatusUnauthorized, "login.gohtml", gin.H{
+			"Error":       "Invalid username or password",
+			"CurrentPath": "/login",
+		})
+		return
+	}
+
+	c.SetCookie("session_id", session.ID, int(24*time.Hour.Seconds()), "/", "", false, true)
+	c.Header("HX-Redirect", "/")
+	c.Redirect(http.StatusSeeOther, "/")
+}
+
+func (h *AuthHandler) HandleLogout(c *gin.Context) {
+	sessionID, err := c.Cookie("session_id")
+	if err == nil {
+		_ = h.svc.Logout(c.Request.Context(), sessionID)
+	}
+
+	c.SetCookie("session_id", "", -1, "/", "", false, true)
+	c.Redirect(http.StatusSeeOther, "/login")
+}