ajout authentification admin/user

my-library/src/context/AuthContext.js

@@ -0,0 +1,39 @@
+import { createContext, useContext, useState } from 'react';
+
+const USERS = [
+  { username: 'admin', password: 'admin', role: 'admin' },
+  { username: 'alice', password: 'bob', role: 'user' },
+];
+
+const AuthContext = createContext(null);
+
+export function AuthProvider({ children }) {
+  const [user, setUser] = useState(() => {
+    const saved = localStorage.getItem('auth');
+    return saved ? JSON.parse(saved) : null;
+  });
+
+  function login(username, password) {
+    const found = USERS.find(u => u.username === username && u.password === password);
+    if (!found) return false;
+    const { password: _, ...safe } = found;
+    setUser(safe);
+    localStorage.setItem('auth', JSON.stringify(safe));
+    return true;
+  }
+
+  function logout() {
+    setUser(null);
+    localStorage.removeItem('auth');
+  }
+
+  return (
+    <AuthContext.Provider value={{ user, login, logout }}>
+      {children}
+    </AuthContext.Provider>
+  );
+}
+
+export function useAuth() {
+  return useContext(AuthContext);
+}