一、创建json文件，用于编辑policy，文件内容如下（Version并不重要），Action存在多种选择(如步骤三所示)，并且允许同时选择多个，本文只是通过URL访问Bucket中的文件，因此只选择了s3:GetObject。
{
"Version": "2012-10-17",
"Statement": [
{
"Effect": "Allow",
"Principal":"*",
"Action":"s3:GetObject",
"Resource": "*"
}
]
}
二、配置Policy生效，命令如下（File为上一步生成的文件）。
s3cmd setpolicy <File> s3://<Bucket>/ --acl-public //这一条命令使得<Bucket>中的所有内容权限为Public(只读），包括续传的文件。其中，<File>为上一步创建的json文件。
s3cmd setacl --acl-public s3://<Bucket>/ //这一条命令使得<Bucket>的文件目录权限为Public（只读），即可通过URL看到<Bucket>中的文件目录。
三、S3 Action
- s3:AbortMultipartUpload
- s3:CreateBucket
- s3:DeleteBucketPolicy
- s3:DeleteBucket
- s3:DeleteBucketWebsite
- s3:DeleteObject
- s3:DeleteObjectVersion
- s3:DeleteReplicationConfiguration
- s3:GetAccelerateConfiguration
- s3:GetBucketAcl
- s3:GetBucketCORS
- s3:GetBucketLocation
- s3:GetBucketLogging
- s3:GetBucketNotification
- s3:GetBucketPolicy
- s3:GetBucketRequestPayment
- s3:GetBucketTagging
- s3:GetBucketVersioning
- s3:GetBucketWebsite
- s3:GetLifecycleConfiguration
- s3:GetObjectAcl
- s3:GetObject
- s3:GetObjectTorrent
- s3:GetObjectVersionAcl
- s3:GetObjectVersion
- s3:GetObjectVersionTorrent
- s3:GetReplicationConfiguration
- s3:ListAllMyBuckets
- s3:ListBucketMultiPartUploads
- s3:ListBucket
- s3:ListBucketVersions
- s3:ListMultipartUploadParts
- s3:PutAccelerateConfiguration
- s3:PutBucketAcl
- s3:PutBucketCORS
- s3:PutBucketLogging
- s3:PutBucketNotification
- s3:PutBucketPolicy
- s3:PutBucketRequestPayment
- s3:PutBucketTagging
- s3:PutBucketVersioning
- s3:PutBucketWebsite
- s3:PutLifecycleConfiguration
- s3:PutObjectAcl
- s3:PutObject
- s3:PutObjectVersionAcl
- s3:PutReplicationConfiguration
- s3:RestoreObject
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