Hard
Security Issues in Async Token Manager Implementation with Error Handling
Your authentication system needs to securely store user tokens. What's wrong with this implementation?
1class TokenManager {2 #tokens = new Map();34 constructor() {5 this.checkTokens();6 setInterval(this.checkTokens.bind(this), 60000);7 }89 async checkTokens() {10 for (let [userId, tokenData] of this.#tokens) {11 if (this.isExpired(tokenData)) {12 this.#tokens.delete(userId);13 await this.refreshToken(userId);14 }15 }16 }1718 isExpired({ expiresAt }) {19 return Date.now() >= expiresAt;20 }2122 async refreshToken(userId) {23 try {24 const response = await fetch('/api/refresh', {25 method: 'POST',26 body: JSON.stringify({ userId })27 });28 const data = await response.json();29 this.#tokens.set(userId, {30 token: data.token,31 expiresAt: Date.now() + data.expiresIn32 });33 } catch (error) {34 console.error('Token refresh failed:', error);35 }36 }37}