refactor: 优化超时设置并调整缓存处理逻辑

移除冗余的 `requestTimeout` 变量，将 `fetchApiData` 的超时时间调整为 5 秒，并在 `fetchAndServe` 中取消超时限制。同时，增加对 `content-length` 的校验，当响应内容小于 2KB 且与缓存文件大小不一致时，返回 502 错误。

package.json

@@ -1,5 +1,6 @@
 {
 	"devDependencies": {
 		"javascript-obfuscator": "^4.1.1"
-	}
+	},
+	"packageManager": "pnpm@9.15.1+sha512.1acb565e6193efbebda772702950469150cf12bcc764262e7587e71d19dc98a423dff9536e57ea44c49bdf790ff694e83c27be5faa23d67e0c033b583be4bfcf"
 }

source.js

@@ -6,7 +6,6 @@ const fs = require('fs');
 const pathModule = require('path');
 const crypto = require('crypto');
 
-const requestTimeout = 20000; // 10 seconds
 const cacheDir = pathModule.join(__dirname, '.cache');
 const args = process.argv.slice(2);
 const pathIndex = {};
@@ -220,9 +219,7 @@ const checkCacheHeaders = async (req, cacheMetaFile) => {
     const cacheData = JSON.parse(fs.readFileSync(cacheMetaFile, 'utf8'));
     const ifNoneMatch = req.headers['if-none-match'];
     const ifModifiedSince = req.headers['if-modified-since'];
-
     let isNotModified = false;
-
     if (ifNoneMatch && ifNoneMatch === cacheData.uniqid) {
         isNotModified = true;
     } else if (ifModifiedSince) {
@@ -262,8 +259,10 @@ const fetchApiData = (reqPath, token, sign) => {
                 'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/89.0.4389.114 Safari/537.36',
                 'token': token
             },
-            timeout: requestTimeout,
-            rejectUnauthorized: false
+            // 超时设置, 5 秒
+            timeout: 5000,
+            rejectUnauthorized: false,
+            // 超时设置
         }, (apiRes) => {
             let data = '';
             apiRes.on('data', chunk => data += chunk);
@@ -282,14 +281,25 @@ const fetchApiData = (reqPath, token, sign) => {
 
 // 从真实 URL 获取数据并写入缓存
 const fetchAndServe = (data, tempCacheContentFile, cacheContentFile, cacheMetaFile, res) => {
-    https.get(data.realUrl, { timeout: requestTimeout * 10, rejectUnauthorized: false }, (realRes) => {
+
+    // 不限超时
+    https.get(data.realUrl, { timeout: 0, rejectUnauthorized: false }, (realRes) => {
         const cacheStream = fs.createWriteStream(tempCacheContentFile, { flags: 'w' });
 
         let isVideo = data.path && typeof data.path === 'string' && data.path.includes('.mp4');
-
         // 确保 content-length 是有效的
         const contentLength = realRes.headers['content-length'];
         if (contentLength) {
+
+            // contentLength 小于 2KB 且与缓存文件大小不一致时，重新获取
+            if (contentLength < 2048 && data.headers['content-length'] !== contentLength) {
+                console.warn('Warning: content-length is different for the response from:', data.realUrl);
+                // 返回错误
+                res.writeHead(502, { 'Content-Type': 'text/plain;charset=UTF-8;' });
+                res.end(`Bad Gateway: ${data.realUrl}`);
+                return;
+            }
+
             data.headers['content-length'] = contentLength;
             // 更新 data 到缓存 cacheMetaFile
             fs.writeFileSync(cacheMetaFile, JSON.stringify(data));