前端防护核心技术

请求频率限制（客户端实现）

class RequestThrottler {
  constructor(maxRequests, interval) {
    this.queue = [];
    this.maxRequests = maxRequests;
    this.interval = interval;
    this.timer = null;
  }

  add(requestFn) {
    return new Promise((resolve, reject) => {
      this.queue.push({ requestFn, resolve, reject });
      this.processQueue();
    });
  }

  processQueue() {
    if (this.timer) return;

    const processNext = () => {
      if (this.queue.length === 0) {
        clearInterval(this.timer);
        this.timer = null;
        return;
      }
      
      const slice = this.queue.splice(0, this.maxRequests);
      slice.forEach(item => {
        item.requestFn()
          .then(item.resolve)
          .catch(item.reject);
      });
    };

    this.timer = setInterval(processNext, this.interval);
    processNext();
  }
}

// 使用示例：限制每5秒最多3个关键请求
const throttler = new RequestThrottler(3, 5000);

// 代替直接调用fetch
const safeFetch = (url, options) => {
  return throttler.add(() => fetch(url, options));
};

用户行为验证系统

function detectAnomalousBehavior() {
  const ACTION_THRESHOLD = 15; // 每秒操作阈值
  let actionCount = 0;
  let lastReset = Date.now();

  const eventTypes = ['click', 'touchstart', 'keydown'];
  
  eventTypes.forEach(type => {
    document.addEventListener(type, () => {
      const now = Date.now();
      if (now - lastReset > 1000) {
        actionCount = 0;
        lastReset = now;
      }
      
      if (++actionCount > ACTION_THRESHOLD) {
        handleSuspiciousActivity();
      }
    }, { passive: true });
  });
}

function handleSuspiciousActivity() {
  // 触发验证流程
  const challenge = document.createElement('div');
  challenge.innerHTML = `
    <div class="captcha-overlay">
      <h3>安全验证</h3>
      <p>请完成验证以继续游戏</p>
      <button id="verify-btn">我是真人</button>
    </div>
  `;
  document.body.appendChild(challenge);
  
  document.getElementById('verify-btn').addEventListener('click', () => {
    challenge.remove();
  });
}

// 游戏启动时初始化
detectAnomalousBehavior();

专业防护方案推荐

当客户端防护不足以应对复杂攻击时，我们引入了群联AI云防护解决方案。其核心优势包括：

1. 智能流量清洗：基于机器学习模型实时分析请求特征，准确区分真实玩家和攻击流量
2. 全球分布式节点：通过50+全球接入点分散攻击压力，确保亚洲玩家延迟低于80ms
3. 无缝集成方案：

# 服务器配置示例
server {
    listen 443 ssl;
    server_name game-api.example.com;
    
    location / {
        # 群联防护节点自动路由
        proxy_pass https://shield.qunlian.cloud/$host$request_uri;
        proxy_set_header X-Real-IP $remote_addr;
        
        # 安全校验头
        proxy_set_header QL-Shield-Token "YOUR_API_KEY";
    }
}

某卡牌游戏接入后效果：

• DDoS攻击拦截率：99.8%
• 误封率：<0.01%
• 服务器成本降低40%