如何从Angularjs通过nodejs express上传文件到s3

<form ng-submit="uploadFile()">
  <input type="file" ng-model="file" />
  <button type="submit">上传文件</button>
</form>

$scope.uploadFile = function() {
  var formData = new FormData();
  formData.append('file', $scope.file);

  $http.post('/upload', formData, {
    transformRequest: angular.identity,
    headers: {'Content-Type': undefined}
  }).then(function(response) {
    // 文件上传成功的处理逻辑
  }, function(error) {
    // 文件上传失败的处理逻辑
  });
};

const express = require('express');
const multer = require('multer');
const AWS = require('aws-sdk');

const router = express.Router();
const upload = multer({ dest: 'uploads/' });

// 配置AWS SDK
AWS.config.update({
  accessKeyId: 'YOUR_ACCESS_KEY_ID',
  secretAccessKey: 'YOUR_SECRET_ACCESS_KEY'
});

// 创建S3实例
const s3 = new AWS.S3();

// 处理文件上传请求
router.post('/upload', upload.single('file'), (req, res) => {
  const file = req.file;

  // 设置S3上传参数
  const params = {
    Bucket: 'YOUR_S3_BUCKET_NAME',
    Key: file.originalname,
    Body: file.buffer
  };

  // 上传文件到S3
  s3.upload(params, (err, data) => {
    if (err) {
      // 文件上传失败的处理逻辑
      res.status(500).json({ error: err.message });
    } else {
      // 文件上传成功的处理逻辑
      res.json({ url: data.Location });
    }
  });
});

module.exports = router;

const express = require('express');
const fileUploadRouter = require('./routes/fileUpload');

const app = express();

app.use('/api', fileUploadRouter);

app.listen(3000, () => {
  console.log('服务器已启动，监听端口3000');
});