// 检查令牌有效性示例
async function checkTokenValidity(accessToken) {
  try {
    const response = await fetch(`https://graph.facebook.com/debug_token?input_token=${accessToken}&access_token=${accessToken}`);
    const data = await response.json();
    if (data.data && data.data.is_valid) {
      return true;
    }
    return false;
  } catch (error) {
    console.error('Token验证失败:', error);
    return false;
  }
}

// 实现请求节流
const rateLimiter = {
  lastRequestTime: 0,
  minInterval: 1000, // 1秒间隔
  async makeRequest(url) {
    const now = Date.now();
    const timeSinceLast = now - this.lastRequestTime;
    
    if (timeSinceLast < this.minInterval) {
      await new Promise(resolve => setTimeout(resolve, this.minInterval - timeSinceLast));
    }
    
    this.lastRequestTime = Date.now();
    return fetch(url);
  }
};

// 验证请求数据示例
function validatePostData(postData) {
  const requiredFields = ['message', 'link'];
  const missingFields = requiredFields.filter(field => !postData[field]);
  
  if (missingFields.length > 0) {
    throw new Error(`缺少必填字段: ${missingFields.join(', ')}`);
  }
  
  if (postData.message.length > 5000) {
    throw new Error('消息内容过长');
  }
}

// 带重试机制的请求示例
async function fetchWithRetry(url, retries = 3, delay = 1000) {
  try {
    const response = await fetch(url);
    if (!response.ok) throw new Error(`HTTP error! status: ${response.status}`);
    return await response.json();
  } catch (error) {
    if (retries > 0) {
      await new Promise(resolve => setTimeout(resolve, delay));
      return fetchWithRetry(url, retries - 1, delay * 2);
    }
    throw error;
  }
}