125 lines
3.9 KiB
JavaScript
125 lines
3.9 KiB
JavaScript
import express from 'express';
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import fetch from 'node-fetch';
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import { URL } from 'url';
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const app = express();
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const port = 3000;
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// 允许跨域请求
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app.use((req, res, next) => {
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res.header('Access-Control-Allow-Origin', '*');
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res.header('Access-Control-Allow-Methods', 'GET, HEAD, OPTIONS');
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res.header('Access-Control-Allow-Headers', 'Range');
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next();
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});
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// 本地静态文件代理：/local -> C:\Users\xyf17\Merlin\data
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const localDataPath = 'C:\\Users\\xyf17\\Merlin\\data';
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app.use('/local', express.static(localDataPath));
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// 通用代理路由
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app.get('/proxy', async (req, res) => {
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console.log('Received Range header:', req.headers.range);
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// 获取目标 URL
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const targetUrl = req.query.url;
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console.log('Fetching data from:', targetUrl);
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if (!targetUrl) {
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return res.status(400).json({ error: 'URL parameter is required' });
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}
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try {
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// 设置请求头
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const headers = {
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'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36'
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};
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// 避免上游压缩导致 Range/MSE 解析异常（mp4 一般不会压缩，但这里保守处理）
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headers['Accept-Encoding'] = 'identity';
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if (req.headers.range) {
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headers['Range'] = req.headers.range; // 转发 Range 请求头，支持视频分段加载
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}
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// 向目标 URL 发起请求
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const response = await fetch(targetUrl, { headers });
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// 检查响应状态
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if (!response.ok) {
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return res.status(response.status).json({
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error: `Failed to fetch: ${response.statusText}`,
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status: response.status
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});
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}
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// 关键：Range 请求上游通常返回 206；必须把状态码透传给浏览器
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res.status(response.status);
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// 设置响应头
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response.headers.forEach((value, key) => {
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// 跳过一些可能导致问题的头信息
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if (key.toLowerCase() !== 'content-encoding' &&
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key.toLowerCase() !== 'transfer-encoding' &&
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key.toLowerCase() !== 'connection') {
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res.setHeader(key, value);
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}
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});
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// 特殊处理 Transfer-Encoding 和 Content-Length
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if (response.headers.get('transfer-encoding') === 'chunked') {
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res.removeHeader('Content-Length');
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}
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// 将响应体直接流式传输给客户端
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if (response.body) {
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response.body.pipe(res, { end: true });
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// 错误处理
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response.body.on('error', (err) => {
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console.error('Error during data transfer:', err);
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if (!res.headersSent) {
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res.status(500).json({ error: 'Error during data transfer' });
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}
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});
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} else {
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res.status(500).json({ error: 'No response body' });
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}
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} catch (error) {
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console.error('Error fetching data:', error);
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// 根据错误类型返回更具体的错误信息
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let errorMessage = 'Error fetching data';
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let statusCode = 500;
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let hostname = '';
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try {
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hostname = new URL(targetUrl).hostname;
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} catch (e) {
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hostname = 'unknown';
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}
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if (error.code === 'ENOTFOUND') {
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errorMessage = `DNS解析失败：无法解析域名 "${hostname}"。请检查URL是否正确，或网络连接是否正常。`;
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statusCode = 502;
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} else if (error.code === 'ECONNREFUSED') {
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errorMessage = `连接被拒绝：无法连接到目标服务器 "${hostname}"。`;
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statusCode = 502;
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} else if (error.code === 'ETIMEDOUT') {
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errorMessage = `请求超时：目标服务器 "${hostname}" 响应时间过长。`;
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statusCode = 504;
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}
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if (!res.headersSent) {
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res.status(statusCode).json({
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error: errorMessage,
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code: error.code,
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targetUrl: targetUrl
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});
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}
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}
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});
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app.listen(port, () => {
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console.log(`Proxy server running at http://localhost:${port}`);
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});
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