React Context 传递用户ID：解决用户身份验证和页面跳转问题

import React, { createContext, useState } from 'react';

export const UserContext = createContext({});

export function UserContextProvider({ children }) {
  const [userInfo, setUserInfo] = useState({});
  const [userId, setUserId] = useState(null);

  return (
    <UserContext.Provider value={{ userId, setUserId, userInfo, setUserInfo }}>
      {children}
    </UserContext.Provider>
  );
}

import React from 'react';
import { UserContextProvider } from './UserContext';
import LoginPage from './LoginPage';
import Layout from './Layout';
import { BrowserRouter, Routes, Route } from 'react-router-dom';

function App() {
  return (
    <UserContextProvider>
      <BrowserRouter>
        <Routes>
          <Route path="/login" element={<LoginPage />} />
          <Route path="*" element={<Layout />} />
        </Routes>
      </BrowserRouter>
    </UserContextProvider>
  );
}

export default App;

import React, { useContext, useState } from "react";
import { Navigate } from "react-router-dom";
import "../../styles/LoginPage.css";
import { Link } from "react-router-dom";
import axios from "axios";
import { UserContext } from "../UserContext";

function LoginPage({ isLoggedIn,setIsLoggedIn }) {
  const [email, setEmail] = useState("");
  const [password, setPassword] = useState("");
  const [redirect, setRedirect] = useState(false);
  const [errorMessage, setErrorMessage] = useState("");
  const { setUserId } = useContext(UserContext);

  const login = async (ev) => {
    ev.preventDefault();

    try {
      const response = await axios.post(
        `http://localhost:8000/users/login`,
        {
          email,
          password,
        },
        {
          withCredentials: true,
        }
      );

      console.log(response);

      if (response.data.errors) {
        setErrorMessage("Erreur lors de la connexion");
      } else {
        setIsLoggedIn(true); // Mettre à jour l'état global de connexion
        setRedirect(true); // Définir la redirection
        setUserId(response.data.userId); // 假设 response.data 包含 userId
      }
    } catch (error) {
      console.error("Error:", error);
      setErrorMessage("Informations incorrectes");
    }
  };

  if (redirect) {
    return <Navigate to="/" />;
  }

  return (
    <form onSubmit={login}>
      <h1 className="login-title">Login</h1>
      <input
        type="email"
        placeholder="Email"
        value={email}
        onChange={(ev) => setEmail(ev.target.value)}
      />
      <input
        type="password"
        placeholder="Mot de passe"
        value={password}
        onChange={(ev) => setPassword(ev.target.value)}
      />
      {errorMessage && <p className="error-message">{errorMessage}</p>}
      <button className="my-button">Connexion</button>
      <Link to="/register">
        <button className="my-button">Pas de compte ?</button>
      </Link>
    </form>
  );
}

export default LoginPage;

import '../styles/Layout.css'
import skull from '../assets/bg3.gif'
import { Link, useNavigate } from "react-router-dom";
import { Outlet } from "react-router-dom";
import React, { useContext } from 'react';
import { UserContext } from './UserContext';


function Layout({isLoggedIn,setIsLoggedIn}) {
  const title_header = "True Crime Story";
  const navigate = useNavigate();
  const { userId } = useContext(UserContext);


  const handleLogout = async () => {
    try {
      // Effectuer les actions de déconnexion, tels que la suppression du cookie, etc.

      setIsLoggedIn(false);
      navigate("/login"); // Effectuer la redirection vers la page d'accueil ("/")
    } catch (error) {
      console.error("Error during logout:", error);
    }
  };

  return (
    <div>
      <div className="header">
        <div className="main-title">
          <h1>{title_header}</h1>
        </div>
        <ul className="side-bar">
          <li><Link to="/">Accueil</Link></li>
          {isLoggedIn && (
            <>
              <li>
              <Link to={`/users/${userId}`}>Profil</Link>

              </li>
              <li>
                <button onClick={handleLogout}>Déconnexion</button>
              </li>
            </>
          )}
          {!isLoggedIn && (
            <li>
              <Link to="/login">Connexion</Link>
            </li>
          )}
          <li><Link to="/articles">Articles</Link></li>
          <li><Link to="/infos">Infos</Link></li>
        </ul>
      </div>
      <div className="body">
        <div className="modal">
          <div className="modal-content">
            <Outlet />
          </div>
        </div>
      </div>
      <img src={skull} className="image-skull" alt="skull-gif" />
    </div>
  );
}

export default Layout;