将 HeadBucket
与 AWS SDK 或 CLI 配合使用
以下代码示例演示如何使用 HeadBucket
。
- Bash
-
- AWS CLI 及 Bash 脚本
-
注意
查看 GitHub,了解更多信息。查找完整示例,学习如何在 AWS 代码示例存储库
中进行设置和运行。 ############################################################################### # function bucket_exists # # This function checks to see if the specified bucket already exists. # # Parameters: # $1 - The name of the bucket to check. # # Returns: # 0 - If the bucket already exists. # 1 - If the bucket doesn't exist. ############################################################################### function bucket_exists() { local bucket_name bucket_name=$1 # Check whether the bucket already exists. # We suppress all output - we're interested only in the return code. if aws s3api head-bucket \ --bucket "$bucket_name" \ >/dev/null 2>&1; then return 0 # 0 in Bash script means true. else return 1 # 1 in Bash script means false. fi }
-
有关 API 详细信息,请参阅《AWS CLI 命令参考》中的 HeadBucket。
-
- CLI
-
- AWS CLI
-
以下命令验证对名为
my-bucket
的存储桶的访问权限:aws s3api head-bucket --bucket
my-bucket
如果存储桶存在并且您可以访问它,则不返回任何输出。否则,会显示错误消息。例如:
A client error (404) occurred when calling the HeadBucket operation: Not Found
-
有关 API 详细信息,请参阅《AWS CLI 命令参考》中的 HeadBucket
。
-
- Go
-
- 适用于 Go V2 的 SDK
-
注意
查看 GitHub,了解更多信息。查找完整示例,学习如何在 AWS 代码示例存储库
中进行设置和运行。 // BucketBasics encapsulates the Amazon Simple Storage Service (Amazon S3) actions // used in the examples. // It contains S3Client, an Amazon S3 service client that is used to perform bucket // and object actions. type BucketBasics struct { S3Client *s3.Client } // BucketExists checks whether a bucket exists in the current account. func (basics BucketBasics) BucketExists(bucketName string) (bool, error) { _, err := basics.S3Client.HeadBucket(context.TODO(), &s3.HeadBucketInput{ Bucket: aws.String(bucketName), }) exists := true if err != nil { var apiError smithy.APIError if errors.As(err, &apiError) { switch apiError.(type) { case *types.NotFound: log.Printf("Bucket %v is available.\n", bucketName) exists = false err = nil default: log.Printf("Either you don't have access to bucket %v or another error occurred. "+ "Here's what happened: %v\n", bucketName, err) } } } else { log.Printf("Bucket %v exists and you already own it.", bucketName) } return exists, err }
-
有关 API 详细,请参阅《AWS SDK for Go API 参考》中的 HeadBucket
。
-
- Python
-
- SDK for Python (Boto3)
-
注意
查看 GitHub,了解更多信息。查找完整示例,学习如何在 AWS 代码示例存储库
中进行设置和运行。 class BucketWrapper: """Encapsulates S3 bucket actions.""" def __init__(self, bucket): """ :param bucket: A Boto3 Bucket resource. This is a high-level resource in Boto3 that wraps bucket actions in a class-like structure. """ self.bucket = bucket self.name = bucket.name def exists(self): """ Determine whether the bucket exists and you have access to it. :return: True when the bucket exists; otherwise, False. """ try: self.bucket.meta.client.head_bucket(Bucket=self.bucket.name) logger.info("Bucket %s exists.", self.bucket.name) exists = True except ClientError: logger.warning( "Bucket %s doesn't exist or you don't have access to it.", self.bucket.name, ) exists = False return exists
-
有关 API 详细信息,请参阅《AWS SDK for Python (Boto3) API 参考》中的 HeadBucket。
-
有关 AWS SDK 开发人员指南和代码示例的完整列表,请参阅 将此服务与 AWS SDK 结合使用。本主题还包括有关入门的信息以及有关先前的 SDK 版本的详细信息。
GetPublicAccessBlock
HeadObject