boto3 python为整个存储桶生成预签名的url

import boto3
from botocore.exceptions import NoCredentialsError

def generate_presigned_url(bucket_name, object_name, expiration=3600):
    """生成存储桶预签名URL"""
    # 创建S3客户端
    s3_client = boto3.client('s3')
    try:
        # 生成预签名URL
        response = s3_client.generate_presigned_url('get_object',
                                                    Params={'Bucket': bucket_name,
                                                            'Key': object_name},
                                                    ExpiresIn=expiration)
    except NoCredentialsError:
        return "无法访问AWS服务，请确保您的凭证配置正确。"
    return response