Update server.js

server.js

@@ -76,6 +76,23 @@ app.get('/', (req, res) => {
     });
 });
 
+// === 辅助函数 ===
+// 生成设备指纹
+const generateDeviceFingerprint = (req) => {
+    const ip = req.clientIp || '';
+    const userAgent = req.headers['user-agent'] || '';
+    const acceptLanguage = req.headers['accept-language'] || '';
+    const connection = req.headers['connection'] || '';
+    const encoding = req.headers['accept-encoding'] || '';
+    const forwardedFor = req.headers['x-forwarded-for'] || '';
+
+    // 将关键信息合并生成唯一指纹
+    const rawFingerprint = `${ip}-${userAgent}-${acceptLanguage}-${connection}-${encoding}-${forwardedFor}`;
+
+    // 使用 SHA-256 哈希算法生成指纹
+    const fingerprint = crypto.createHash('sha256').update(rawFingerprint).digest('hex');
+    return fingerprint;
+};
 
 // === 路由与业务逻辑 ===
 
@@ -139,4 +156,3 @@ app.listen(PORT, HOST, (err) => {
 
 // 打印环境变量（调试使用）
 console.log("Full Environment Variables:", process.env);
-