Header.js

import {Link} from "react-router-dom";
import logo from './logo.png';
import './Header.css';
import cookie from 'react-cookies';
import React, { useEffect, useState, useContext} from 'react';
import { useNavigate, Navigate } from "react-router-dom";
import { UserContext } from './Usercontext.js';
import axios from 'axios';
axios.defaults.withCredentials = true;


function Welcome(props){
	
	return (
	<p>
		{props.name?`${props.name}님, 환영합니다`:'로그인하세요.'}<br/>
	</p>
	)
}

function ButtonLink({link, onclick, children}){
	
	return (
		<botton onClick = {()=>{
			onclick(link)}}>
			{children}
		</botton>
	)
}

function Header({user}){
	//console.log(cookie.load('name'))
	const [currentSession, setCurrentSession] = useState(false)
	
	const setUserName = useContext(UserContext);
	const navigate = useNavigate();
	function checkSession_And_Navigate(link){
		if (cookie.load('name')) {
			navigate(link);
			setCurrentSession(true)
		}
		else {
			setUserName(null)
			if (currentSession){
				alert('세션이 만료되었습니다. 로그인 후 이용해 주세요.')
			}
			else {
				alert('로그인 후 이용해 주세요.')
			}
			
			navigate("/login");
			setCurrentSession(false)
		}
	}
	
	function dont_CheckSession_And_Navigate(link){
		if (cookie.load('name')) {
			setCurrentSession(true)
		}
		else {
			setUserName(null)
			if (currentSession){
				alert('세션이 만료되었습니다. 자동으로 로그아웃됩니다.')
			}
			setCurrentSession(false)
		}
		navigate(link);
	}

	function logOut(){
		let response = requestLogout();
		if (response){
			setUserName(null)
			alert('로그아웃되었습니다. 메인 화면으로 돌아갑니다..')
			setCurrentSession(false)
			navigate('/');		
		}	
	}
	
    return(
        <div className="header">
			<ButtonLink link='/' onclick={dont_CheckSession_And_Navigate}>
				<img className="logo_image" alt="logo" src={logo}/>
			</ButtonLink>

			<ul>

				<Welcome name={user}></Welcome>

				<ul className="menu_list">
					<li><ButtonLink link='/' onclick={dont_CheckSession_And_Navigate}>Home</ButtonLink></li>
					<li><ButtonLink link='/search' onclick={checkSession_And_Navigate}>검색</ButtonLink></li>
					<li><ButtonLink link='/postwrite' onclick={checkSession_And_Navigate}>포스트 작성</ButtonLink></li>
					<li><ButtonLink link='/login' onclick={user?logOut:dont_CheckSession_And_Navigate}>{user?'로그아웃':'로그인'}</ButtonLink></li> {/*로그인 여부 로직 구현 필요*/}
					{/* { Object.keys(user).length != 0 ? 
						<li><Link to={`/profile/${getUserId()}`}>profile</Link>/<span onClick={logout}>logout</span></li> :
						<li><Link to="/login">login</Link></li>
					}   */}
				</ul>
			</ul>
        </div>
    );
}

async function requestLogout() {
  const response = await axios({
    url: 'http://localhost:8080/logout', // 통신할 웹문서
    method: 'get', // 통신할 방식
  });
  if (response.status === 200) {
    return response.data;
  }
  else {
    return null;
  }
}

export default Header;