feat: autenticazione a sessioni, middleware admin e script create-user

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

tests/auth.test.ts

@@ -0,0 +1,45 @@
+import { describe, it, expect, beforeEach } from 'vitest';
+import type Database from 'better-sqlite3';
+import { createDb } from '../src/lib/db';
+import { hashPassword, verifyPassword, createUser, login, getSessionUser, logout } from '../src/lib/auth';
+
+let db: Database.Database;
+beforeEach(() => { db = createDb(':memory:'); });
+
+describe('auth', () => {
+  it('hash e verifica password', () => {
+    const h = hashPassword('segreta123');
+    expect(h).not.toBe('segreta123');
+    expect(verifyPassword('segreta123', h)).toBe(true);
+    expect(verifyPassword('sbagliata', h)).toBe(false);
+  });
+
+  it('login corretto crea sessione recuperabile', () => {
+    createUser(db, 'adriano', 'segreta123');
+    const token = login(db, 'adriano', 'segreta123');
+    expect(token).toBeTruthy();
+    const user = getSessionUser(db, token!);
+    expect(user).toMatchObject({ username: 'adriano' });
+  });
+
+  it('login errato ritorna null', () => {
+    createUser(db, 'adriano', 'segreta123');
+    expect(login(db, 'adriano', 'sbagliata')).toBeNull();
+    expect(login(db, 'inesistente', 'x')).toBeNull();
+  });
+
+  it('sessione scaduta viene rifiutata ed eliminata', () => {
+    createUser(db, 'adriano', 'segreta123');
+    const token = login(db, 'adriano', 'segreta123')!;
+    db.prepare("UPDATE sessions SET expires_at = datetime('now', '-1 day')").run();
+    expect(getSessionUser(db, token)).toBeNull();
+    expect(db.prepare('SELECT COUNT(*) AS n FROM sessions').get()).toMatchObject({ n: 0 });
+  });
+
+  it('logout elimina la sessione', () => {
+    createUser(db, 'adriano', 'segreta123');
+    const token = login(db, 'adriano', 'segreta123')!;
+    logout(db, token);
+    expect(getSessionUser(db, token)).toBeNull();
+  });
+});