覆盖烧瓶中的FileStorage.save行为

from werkzeug.utils import secure_filename

class CustomFileStorage:
    def __init__(self, storage_path):
        self.storage_path = storage_path

    def save(self, file):
        filename = secure_filename(file.filename)
        file.save(os.path.join(self.storage_path, filename))
        # 在这里可以添加将文件上传到云存储服务的代码

# 在烧瓶应用中使用自定义的文件存储类
app.config['UPLOAD_FOLDER'] = '/path/to/uploads'
app.config['ALLOWED_EXTENSIONS'] = {'txt', 'pdf', 'png', 'jpg', 'jpeg', 'gif'}

def allowed_file(filename):
    return '.' in filename and \
           filename.rsplit('.', 1)[1].lower() in app.config['ALLOWED_EXTENSIONS']

@app.route('/upload', methods=['POST'])
def upload_file():
    file = request.files['file']
    if file and allowed_file(file.filename):
        file_storage = CustomFileStorage(app.config['UPLOAD_FOLDER'])
        file_storage.save(file)
        return 'File uploaded successfully'
    else:
        return 'Invalid file'