如何使用python flask将修改后的图片直接上传到s3 bucket

from flask import Flask, request
import boto3
from botocore.exceptions import NoCredentialsError
from PIL import Image
import io

app = Flask(__name__)
app.config['S3_BUCKET'] = 'your-s3-bucket-name'
app.config['AWS_ACCESS_KEY_ID'] = 'your-access-key-id'
app.config['AWS_SECRET_ACCESS_KEY'] = 'your-secret-access-key'

@app.route('/upload', methods=['POST'])
def upload_image():
    # 获取上传的文件
    file = request.files['image']

    # 读取图片并进行修改
    image = Image.open(file)
    # 在这里进行图片的修改操作，例如调整大小、添加水印等

    # 将修改后的图片保存到内存中
    image_io = io.BytesIO()
    image.save(image_io, format='JPEG')
    image_io.seek(0)

    # 将图片直接上传到S3 Bucket
    s3 = boto3.client('s3')
    try:
        s3.upload_fileobj(image_io, app.config['S3_BUCKET'], file.filename)
        return 'Image uploaded successfully!'
    except NoCredentialsError:
        return 'S3 credentials not available.'

if __name__ == '__main__':
    app.run()