first commit

frontend/src/stores/authStore.ts

@@ -0,0 +1,49 @@
+import { create } from 'zustand';
+
+export interface AuthState {
+  token: string | null;
+  username: string | null;
+  role: 'admin' | 'user' | null;
+  login: (token: string) => void;
+  logout: () => void;
+}
+
+function decodeJwtPayload(token: string): { sub?: string; role?: string } {
+  try {
+    const base64 = token.split('.')[1];
+    const json = atob(base64);
+    return JSON.parse(json);
+  } catch {
+    return {};
+  }
+}
+
+export const useAuthStore = create<AuthState>()((set) => ({
+  token: localStorage.getItem('token'),
+  username: (() => {
+    const t = localStorage.getItem('token');
+    if (!t) return null;
+    return decodeJwtPayload(t).sub ?? null;
+  })(),
+  role: (() => {
+    const t = localStorage.getItem('token');
+    if (!t) return null;
+    const r = decodeJwtPayload(t).role;
+    return r === 'admin' ? 'admin' : r === 'user' ? 'user' : null;
+  })(),
+
+  login: (token: string) => {
+    const payload = decodeJwtPayload(token);
+    localStorage.setItem('token', token);
+    set({
+      token,
+      username: payload.sub ?? null,
+      role: payload.role === 'admin' ? 'admin' : 'user',
+    });
+  },
+
+  logout: () => {
+    localStorage.removeItem('token');
+    set({ token: null, username: null, role: null });
+  },
+}));