// sw.js - 缓存配置
const CACHE_NAME = 'tongji-orchestra-v5';
const STATIC_CACHE = 'static-cache-v5';
const DYNAMIC_CACHE = 'dynamic-cache-v5';

// 静态资源缓存列表
const urlsToCache = [
  '/manifest.json',
  '/images/icon-192x192.png',
  '/images/icon-512x512.png'
];

// 不缓存大文件和视频
const SKIP_CACHE_PATTERNS = [
  /\/uploads\/videos\//,
  /\/uploads\/submissions\//,
  /files\.666-lufengyuan-nb\.top/,  // CDN域名
  /\.mp4$/, /\.avi$/
];

// config/oss.js - CDN A类型鉴权算法
generateAuthUrl(ossPath, expireTime = 3600) {
  const crypto = require('crypto');
  const authKey = process.env.CDN_AUTH_KEY;
  const timestamp = Math.floor(Date.now() / 1000) + expireTime;
  
  // CDN A类型鉴权算法
  const uri = `/${ossPath}`;
  const stringToSign = `${uri}-${timestamp}-0-0-${authKey}`;
  const md5Hash = crypto.createHash('md5')
    .update(stringToSign).digest('hex');
  
  return `https://${this.cdnDomain}${uri}?auth_key=${timestamp}-0-0-${md5Hash}`;
}