使用node.js中的Promise从s3存储桶下载图片

const AWS = require('aws-sdk');
const fs = require('fs');

AWS.config.update({
  accessKeyId: 'YOUR_ACCESS_KEY',
  secretAccessKey: 'YOUR_SECRET_ACCESS_KEY',
  region: 'YOUR_REGION'
});

const s3 = new AWS.S3();
const bucketName = 'YOUR_BUCKET_NAME';

function downloadImageFromS3(key) {
  const params = {
    Bucket: bucketName,
    Key: key
  };

  return new Promise((resolve, reject) => {
    s3.getObject(params, (err, data) => {
      if (err) {
        reject(err);
      } else {
        resolve(data.Body);
      }
    });
  });
}

const imageKey = 'YOUR_IMAGE_KEY';
const localFilePath = 'path/to/save/image.jpg';

downloadImageFromS3(imageKey)
  .then(imageData => {
    fs.writeFileSync(localFilePath, imageData);
    console.log('Image downloaded successfully.');
  })
  .catch(err => {
    console.error('Failed to download image:', err);
  });