[feat] 로그인 기능 구현

src/app/api/login/set-pre-login-path/route.ts

@@ -0,0 +1,18 @@
+import { NextRequest, NextResponse } from 'next/server';
+
+export async function POST(req: NextRequest) {
+  const { path } = await req.json(); // 클라이언트가 보내는 페이지 경로
+  const res = NextResponse.json({ ok: true });
+
+  res.cookies.set({
+    name: 'preLoginPath',
+    value: path,
+    path: '/',
+    maxAge: 60 * 30, // 30분
+    httpOnly: false, // JS에서 읽을 수 있게
+    secure: process.env.NODE_ENV === 'production',
+    sameSite: 'lax',
+  });
+
+  return res;
+}

src/shared/components/auth/LoginRedirectHandler.tsx

@@ -3,16 +3,17 @@
 import { useEffect, useState } from 'react';
 import { usePathname, useRouter } from 'next/navigation';
 import { useAuthStore } from '@/shared/@store/auth';
-import { useModalStore } from '@/shared/@store/modal';
 import { customToast } from '@/shared/components/toast/CustomToastUtils';
 import Spinner from '../spinner/Spinner';
+import WelcomeModal from './WelcomeModal';
+import { getCookie, removeCookie } from './utils/cookie';
 
 function LoginRedirectHandler() {
   const pathname = usePathname();
   const router = useRouter();
   const { user, updateUser } = useAuthStore();
-  const { openWelcomeModal } = useModalStore();
   const [loading, setLoading] = useState(true);
+  const [welcomeModalOpen, setWelcomeModalOpen] = useState(false);
 
   useEffect(() => {
     if (!user && loading) {
@@ -32,15 +33,28 @@ function LoginRedirectHandler() {
   useEffect(() => {
     if (!user || loading) return;
 
-    const preLoginPath = sessionStorage.getItem('preLoginPath') || '/';
+    const preLoginPath = getCookie('preLoginPath') || '/';
+    console.log(preLoginPath);
 
+    // 첫 유저일 경우 모달 오픈
     if (pathname.startsWith('/login/first-user')) {
-      openWelcomeModal(user.nickname);
-    } else if (pathname.startsWith('/login/success')) {
+      setWelcomeModalOpen(true);
+    }
+    // 기존 유저일 경우
+    else if (pathname.startsWith('/login/success')) {
       customToast.success(`${user.nickname}님 \n 로그인 성공 🎉`);
       router.replace(preLoginPath);
+      removeCookie('preLoginPath');
     }
-  }, [pathname, user, router, openWelcomeModal, loading]);
+  }, [pathname, user, loading, router]);
+
+  // 환영 모달 닫힐 때 이동
+  const handleCloseWelcomeModal = () => {
+    setWelcomeModalOpen(false);
+    const preLoginPath = getCookie('preLoginPath') || '/';
+    removeCookie('preLoginPath');
+    router.replace(preLoginPath);
+  };
 
   if (loading) {
     return (
@@ -50,6 +64,17 @@ function LoginRedirectHandler() {
     );
   }
 
-  return null;
+  return (
+    <>
+      {/* 첫 유저 모달 */}
+      {user && (
+        <WelcomeModal
+          userNickname={user.nickname}
+          open={welcomeModalOpen}
+          onClose={handleCloseWelcomeModal}
+        />
+      )}
+    </>
+  );
 }
 export default LoginRedirectHandler;

src/shared/components/auth/Welcome.tsx → src/shared/components/auth/WelcomeModal.tsx

@@ -6,29 +6,29 @@ import Button from '@/shared/components/button/Button';
 import ModalLayout from '@/shared/components/modalPop/ModalLayout';
 import Ssury from '@/shared/assets/ssury/ssury_jump.webp';
 import { useRouter } from 'next/navigation';
-import { useModalStore } from '@/shared/@store/modal';
-import { useAuthStore } from '@/shared/@store/auth';
 
-function Welcome() {
-  const router = useRouter();
-  const { user } = useAuthStore();
-  const { welcomeModal, closeWelcomeModal } = useModalStore();
+interface Props {
+  userNickname: string;
+  open: boolean;
+  onClose: () => void;
+}
 
-  if (!welcomeModal.open || !user) return null;
+function Welcome({ userNickname, open, onClose }: Props) {
+  const router = useRouter();
 
   return (
     <ModalLayout
-      open={welcomeModal.open}
-      onClose={closeWelcomeModal}
-      title={`환영합니다, ${user.nickname}님!`}
+      open={open}
+      onClose={onClose}
+      title={`환영합니다, ${userNickname}님!`}
       description="바텐더 쑤리가 안내해드릴게요"
       buttons={
         <>
           <Button
             type="button"
             color="purple"
             onClick={() => {
-              closeWelcomeModal();
+              onClose();
               router.push('/recipe');
             }}
           >
@@ -37,7 +37,7 @@ function Welcome() {
           <Button
             type="button"
             onClick={() => {
-              closeWelcomeModal();
+              onClose();
               router.push('/recommend');
             }}
           >

src/shared/components/auth/utils/cookie.ts

@@ -0,0 +1,10 @@
+export function getCookie(name: string) {
+  if (typeof document === 'undefined') return null;
+  const match = document.cookie.match(new RegExp('(^| )' + name + '=([^;]+)'));
+  return match ? decodeURIComponent(match[2]) : null;
+}
+
+export function removeCookie(name: string) {
+  if (typeof document === 'undefined') return;
+  document.cookie = `${name}=; path=/; max-age=0`;
+}

src/shared/components/auth/utils/setPreLoginPath.ts

@@ -0,0 +1,8 @@
+export async function setPreLoginPath(path: string) {
+  await fetch('/api/login/set-pre-login-path', {
+    method: 'POST',
+    headers: { 'Content-Type': 'application/json' },
+    body: JSON.stringify({ path }), // 인자로 받은 path 사용
+    credentials: 'include',
+  });
+}

src/shared/components/header/DropdownMenu.tsx

@@ -7,6 +7,7 @@ import { usePathname } from 'next/navigation';
 import { useEffect, useRef } from 'react';
 import gsap from 'gsap';
 import { useAuthStore } from '@/shared/@store/auth';
+import { setPreLoginPath } from '../auth/utils/setPreLoginPath';
 
 interface Props {
   isClicked: boolean;
@@ -116,9 +117,9 @@ function DropdownMenu({ isClicked, setIsClicked }: Props) {
         ) : (
           <Link
             href="/login"
-            onNavigate={() => {
+            onNavigate={async () => {
               setIsClicked(false);
-              sessionStorage.setItem('preLoginPath', window.location.pathname);
+              await setPreLoginPath(window.location.pathname);
             }}
             className="flex items-center gap-2 text-black font-light text-xl hover:text-black/70"
           >

src/shared/components/header/HeaderBtn.tsx

@@ -5,6 +5,7 @@ import SignIn from '@/shared/assets/icons/sign_in_24.svg';
 import { useRouter } from 'next/navigation';
 import tw from '@/shared/utills/tw';
 import { useAuthStore } from '@/shared/@store/auth';
+import { setPreLoginPath } from '../auth/utils/setPreLoginPath';
 
 type RouterType = ReturnType<typeof useRouter>;
 
@@ -39,8 +40,8 @@ function HeaderBtn({ pathname }: { pathname: string }) {
             icon: SignIn,
             label: '로그인',
             className: `${pathname === '/login' ? 'text-tertiary' : ''}`,
-            onClick: () => {
-              sessionStorage.setItem('preLoginPath', window.location.pathname);
+            onClick: async () => {
+              await setPreLoginPath(window.location.pathname);
               router.push('/login');
             },
           },