Add files via upload

public/auth.js

@@ -0,0 +1,70 @@
+const checkTokenValidity = () => {
+    const token = localStorage.getItem('token');
+    if (!token) return false;
+
+    return fetch('/users/me', {
+        headers: {
+            'Authorization': token
+        }
+    })
+    .then(response => {
+        if (!response.ok) {
+            localStorage.removeItem('token');
+            return false;
+        }
+        return true;
+    })
+    .catch(() => {
+        localStorage.removeItem('token');
+        return false;
+    });
+};
+
+document.addEventListener('DOMContentLoaded', async () => {
+    const token = localStorage.getItem('token');
+    const loginLink = document.getElementById('login-link');
+    const registerLink = document.getElementById('register-link');
+    const profileLink = document.getElementById('profile-link');
+    const adminLink = document.getElementById('admin-link');
+    const logoutButton = document.getElementById('logout-button');
+
+    if (token) {
+        const isValid = await checkTokenValidity();
+        if (!isValid) {
+            window.location.href = 'login.html';
+            return;
+        }
+
+        loginLink.style.display = 'none';
+        registerLink.style.display = 'none';
+        profileLink.style.display = 'block';
+        logoutButton.style.display = 'block';
+
+        fetch('/users/me', {
+            headers: {
+                'Authorization': token
+            }
+        })
+        .then(response => response.json())
+        .then(user => {
+            const welcomeMessage = document.getElementById('welcome-message');
+            if (welcomeMessage) {
+                welcomeMessage.textContent = `Bonjour ${user.email}`;
+            }
+            if (user.status === 'admin') {
+                adminLink.style.display = 'block';
+            }
+        });
+
+        logoutButton.addEventListener('click', () => {
+            localStorage.removeItem('token');
+            window.location.href = 'index.html';
+        });
+    } else {
+        loginLink.style.display = 'block';
+        registerLink.style.display = 'block';
+        profileLink.style.display = 'none';
+        adminLink.style.display = 'none';
+        logoutButton.style.display = 'none';
+    }
+});