[Feat] token 관리 (#67)

* feat: AuthProvider

* feat: 토큰 발급 실패 시, 팝업 알림

* feat: 로그아웃

src/app/App.tsx

@@ -1,16 +1,19 @@
 import { RouterProvider } from 'react-router-dom';
 
 import AppRouter from './appRouter';
+import AuthProvider from './AuthProvider';
 import ModalProvider from './ModalProvider';
 import QueryProvider from './QueryProvider';
 
 function App() {
   return (
-    <QueryProvider>
-      <ModalProvider>
-        <RouterProvider router={AppRouter()} />
-      </ModalProvider>
-    </QueryProvider>
+    <AuthProvider>
+      <QueryProvider>
+        <ModalProvider>
+          <RouterProvider router={AppRouter()} />
+        </ModalProvider>
+      </QueryProvider>
+    </AuthProvider>
   );
 }
 

src/app/AuthProvider.tsx

@@ -0,0 +1,83 @@
+import axios from 'axios';
+import type { ReactNode } from 'react';
+import { createContext, useContext, useRef, useState } from 'react';
+
+import api from '@/shared/api/baseApi';
+import { customConfirm } from '@/shared/ui';
+
+interface AuthContextType {
+  accessToken: string | null;
+  setAccessToken: (token: string | null) => void;
+  reissueToken: () => Promise<void>;
+  logout: () => Promise<void>;
+  removeToken: () => void;
+}
+
+const AuthContext = createContext<AuthContextType | undefined>(undefined);
+
+const AuthProvider = ({ children }: { children: ReactNode }) => {
+  const [accessToken, setAccessToken] = useState<string | null>(
+    localStorage.getItem('accessToken'),
+  );
+  const isRefreshing = useRef(false);
+
+  const reissueToken = async () => {
+    if (isRefreshing.current) return;
+
+    isRefreshing.current = true;
+
+    try {
+      const response = await axios.post('/token/reissue', {}, { withCredentials: true });
+
+      const newAccessToken = (response.headers['authorization'] as string)?.split(' ')[1];
+
+      if (newAccessToken) {
+        setAccessToken(newAccessToken);
+        localStorage.setItem('accessToken', newAccessToken);
+      } else {
+        throw new Error('accessToken이 헤더에 포함되어 있지 않습니다.');
+      }
+    } catch (error) {
+      console.error('토큰 재발급 실패:', error);
+      removeToken();
+    } finally {
+      // eslint-disable-next-line require-atomic-updates
+      isRefreshing.current = false;
+    }
+  };
+
+  const removeToken = () => {
+    setAccessToken(null);
+    localStorage.removeItem('accessToken');
+    customConfirm({ title: '로그인', text: '로그인 페이지로 이동합니다.', icon: 'info' });
+  };
+
+  const logout = async () => {
+    try {
+      await api.post('/user/logout');
+
+      setAccessToken(null);
+      localStorage.removeItem('accessToken');
+    } catch (error) {
+      console.error('로그아웃 실패:', error);
+    }
+  };
+
+  return (
+    <AuthContext.Provider
+      value={{ accessToken, setAccessToken, reissueToken, logout, removeToken }}
+    >
+      {children}
+    </AuthContext.Provider>
+  );
+};
+
+export const useAuth = () => {
+  const context = useContext(AuthContext);
+  if (!context) {
+    throw new Error('AuthProvider Error');
+  }
+  return context;
+};
+
+export default AuthProvider;

src/shared/api/baseApi.ts

@@ -1,19 +1,42 @@
-import axios, { isAxiosError } from 'axios';
+import type { AxiosRequestConfig } from 'axios';
+import axios from 'axios';
+
+import { useAuth } from '@/app/AuthProvider';
 
 const api = axios.create({
-  baseURL: ``, // Backend API Domain 주소 넣기
+  baseURL: ``, // Backend API Domain 주소
   timeout: 10_000,
   withCredentials: true,
 });
 
+api.interceptors.request.use(config => {
+  const { accessToken } = useAuth();
+  if (accessToken) {
+    config.headers.Authorization = `Bearer ${accessToken}`;
+  }
+  return config;
+});
+
 api.interceptors.response.use(
   response => response,
   async error => {
-    if (isAxiosError(error)) {
-      return Promise.reject(error);
+    const { reissueToken } = useAuth();
+
+    if (error.response?.status === 401) {
+      try {
+        await reissueToken();
+        const { accessToken } = useAuth();
+
+        if (accessToken && error.config) {
+          error.config.headers.Authorization = `Bearer ${accessToken}`;
+          return api.request(error.config as AxiosRequestConfig);
+        }
+      } catch (reissueError) {
+        console.error('토큰 재발급 실패:', reissueError);
+      }
     }
 
-    return Promise.reject(new Error('알 수 없는 에러 발생'));
+    return Promise.reject(error instanceof Error ? error : new Error('Unknown Error'));
   },
 );