const express = require('express');
const fetch = require('node-fetch');
const sharp = require('sharp');

const app = express();

app.get('/resize', async (req, res) => {
  const imageUrl = req.query.q;

  if (!imageUrl) {
    console.error('没有提供图像 URL');
    return res.status(400).send('没有提供图像 URL');
  }

  try {
    const response = await fetch(imageUrl);
    if (!response.ok) {
      throw new Error(`获取图像失败: ${response.statusText}`);
    }
    const imageBuffer = await response.buffer();
    console.log('原始图像大小:', imageBuffer.byteLength);

    // 使用 sharp 库来调整图像大小
    const resizedImageBuffer = await sharp(imageBuffer).resize(100).toBuffer();
    console.log('压缩后的图像大小:', resizedImageBuffer.byteLength);

    // 将压缩后的图像转换为 Base64 编码的数据
    const base64Image = resizedImageBuffer.toString('base64');

    res.setHeader('Content-Type', 'text/plain');
    res.setHeader('Access-Control-Allow-Origin', '*');
    res.setHeader('Access-Control-Allow-Methods', 'GET, POST, OPTIONS');
    res.setHeader('Access-Control-Allow-Headers', 'Content-Type');
    res.setHeader('Access-Control-Max-Age', '86400');
    res.send(base64Image);
  } catch (error) {
    console.error('压缩图像时出错:', error);
    res.status(500).send('压缩图像时出错');
  }
});

const PORT = process.env.PORT || 7860;
app.listen(PORT, () => {
  console.log(`Server is running on port ${PORT}`);
});