如何在将图像上传到S3 Bucket时在Multer Sharp S3中设置分辨率动态值

const multer = require('multer');
const multerS3 = require('multer-sharp-s3');
const aws = require('aws-sdk');

const s3 = new aws.S3({
  // 配置S3 Bucket的访问密钥等信息
});

const upload = multer({
  storage: multerS3({
    s3: s3,
    Bucket: 'your-bucket-name',
    Key: function(req, file, cb) {
      // 设置图片文件的存储路径和文件名
      const fileName = `${Date.now()}-${file.originalname}`;
      cb(null, fileName);
    },
    resize: {
      width: 800,  // 设置默认的宽度
      height: 600, // 设置默认的高度
      options: {
        fit: 'inside'  // 设置图片缩放的方式
      }
    }
  })
});

const express = require('express');
const app = express();

app.post('/upload', upload.single('image'), function(req, res, next) {
  const { width, height } = req.body;  // 假设从表单中获取宽度和高度
  req.file.resize.width = width;       // 动态设置宽度
  req.file.resize.height = height;     // 动态设置高度
  next();
}, function(req, res) {
  // 图片上传后续处理
  res.send('Image uploaded successfully!');
});

app.listen(3000, function() {
  console.log('Server is listening on port 3000');
});