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const express = require('express');
const morgan = require('morgan');
const { createProxyMiddleware } = require('http-proxy-middleware');
const url = require('url');
const app = express();

app.use(morgan('dev'));

// 从环境变量获取代理配置
const proxyUrl = process.env.PROXY || '';
console.log(`Proxy configuration: ${proxyUrl ? '已配置' : '未配置'}`);

// 解析代理URL
let proxyConfig = null;
if (proxyUrl) {
  try {
    const parsedUrl = url.parse(proxyUrl);
    proxyConfig = {
      host: parsedUrl.hostname,
      port: parsedUrl.port || 80,
      auth: parsedUrl.auth ? {
        username: parsedUrl.auth.split(':')[0],
        password: parsedUrl.auth.split(':')[1]
      } : undefined
    };
    
    // 打印代理配置（安全处理密码）
    const maskedConfig = {
      ...proxyConfig,
      auth: proxyConfig.auth ? {
        username: proxyConfig.auth.username,
        password: '******'
      } : undefined
    };
    console.log('Using proxy:', JSON.stringify(maskedConfig));
  } catch (error) {
    console.error('Failed to parse proxy URL:', error.message);
  }
}

// 配置代理中间件
app.use('/hf/v1/chat/completions', createProxyMiddleware({
  target: 'http://localhost:3010/v1/chat/completions',
  changeOrigin: true,
  // 添加代理配置
  proxy: proxyConfig,
  // 增加错误处理
  onError: (err, req, res) => {
    console.error('Proxy error:', err);
    res.status(500).send('Proxy error occurred: ' + err.message);
  },
  onProxyReq: (proxyReq, req, res) => {
    console.log(`Proxying request to chat completions ${proxyConfig ? 'using proxy' : 'directly'}`);
  },
  onProxyRes: (proxyRes, req, res) => {
    console.log(`Received response with status: ${proxyRes.statusCode}`);
  }
}));

app.get('/', (req, res) => {
  const htmlContent = `
    <!DOCTYPE html>
    <html lang="en">
    <head>
      <meta charset="UTF-8">
      <meta name="viewport" content="width=device-width, initial-scale=1.0">
      <title>Cursor To OpenAI</title>
      <style>
        body {
          font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
          max-width: 800px;
          margin: 0 auto;
          padding: 20px;
          line-height: 1.6;
        }
        .container {
          background: #f9f9f9;
          border-radius: 10px;
          padding: 20px;
          box-shadow: 0 2px 10px rgba(0,0,0,0.1);
        }
        .info-item {
          margin-bottom: 10px;
        }
        .status {
          background: ${proxyConfig ? '#e1f5e1' : '#fff3cd'};
          padding: 10px;
          border-radius: 5px;
          margin-top: 20px;
          border: 1px solid ${proxyConfig ? '#c3e6cb' : '#ffeeba'};
        }
      </style>
    </head>
    <body>
      <div class="container">
        <h1>Cursor To OpenAI Server</h1>
        <div class="info-item">
          <strong>聊天来源:</strong> 自定义(兼容 OpenAI)
        </div>
        <div class="info-item">
          <strong>自定义端点(基本URL)：</strong><span id="endpoint-url"></span>
        </div>
        <div class="info-item">
          <strong>自定义API密钥：</strong>[抓取的Cursor Cookie，格式为user_...]
        </div>
        <div class="status">
          <strong>代理状态：</strong> ${proxyConfig ? '已启用' : '未启用'}
          ${proxyConfig ? `<p>代理服务器: ${proxyConfig.host}:${proxyConfig.port}</p>` : ''}
        </div>
      </div>
      <script>
        const url = new URL(window.location.href);
        const link = url.protocol + '//' + url.host + '/hf/v1';
        document.getElementById('endpoint-url').textContent = link;
      </script>
    </body>
    </html>
  `;
  res.send(htmlContent);
});

const port = process.env.HF_PORT || 7860;
app.listen(port, () => {
  console.log(`HF Proxy server is running at PORT: ${port}`);
  console.log(`Proxy status: ${proxyConfig ? 'Enabled' : 'Disabled'}`);
});