Configuring an Object ACL

Functions

OBS supports the control of access permission for objects. By default, only the object creator has the read and write permissions for the object. However, the creator can set a public access policy to assign the read permission to all other users. Even if the ACL is configured for an object encrypted in the SSE-KMS mode, the inter-tenant access is unavailable.

You can set an access control policy when uploading an object or make a call of an API operation to modify or obtain the object ACL. An object ACL supports a maximum of 100 grants.

This section explains how to modify an object ACL and change access permission on an object.

Versioning

By default, this operation modifies the ACL of the latest version of an object. To specify a specified version, the request can carry the versionId parameter.

Request Syntax

PUT /ObjectName?acl HTTP/1.1 
Host: bucketname.obs.region.example.com
Date: date
Authorization: authorization

<AccessControlPolicy> 
    <Owner> 
        <ID>ID</ID> 
    </Owner> 
    <Delivered>true</Delivered>
    <AccessControlList> 
        <Grant> 
            <Grantee>
               <ID>ID</ID>
            </Grantee> 
            <Permission>permission</Permission> 
        </Grant> 
    </AccessControlList> 
</AccessControlPolicy>

Request Parameters

Table 1 describes the request parameters.

Table 1 Request parameters
Parameter	Description	Mandatory
versionId	Object version ID. The ACL of the specified object version is to be changed. Type: string	No

Request Headers

This request uses common headers. For details, see Table 3.

Request Elements

The request message carries the ACL information of the object by using message elements. For the meanings of the elements, see Table 2.

Table 2 Request elements
Element	Description	Mandatory
Owner	Bucket owner information, including the ID Type: XML	Yes
ID	Domain ID of a user. Type: string	Yes
Grant	Container for the grantee and the granted permissions. A single object ACL can contain no more than 100 grants. Type: XML	No
Grantee	Container for the details about the grantee. Type: XML	No
Canned	Grants permissions to all users. Value range: Everyone Type: string	No
Delivered	Indicates whether an object ACL inherits the ACL of a bucket. Type: boolean Default value: true	No
Permission	Authorized permission. Value options: READ, READ_ACP, WRITE_ACP, FULL_CONTROL Type: string	No
AccessControlList	Indicates an ACL, which consists of three elements: Grant, Grantee, and Permission. Type: XML	Yes

Response Syntax

HTTP/1.1 status_code
Content-Length: length
Content-Type: application/xml

Response Headers

The response to the request uses common headers. For details, see Table 1.

In addition to the common response headers, the headers listed in Table 3 may be used.

Table 3 Additional response headers
Header	Description
x-obs-version-id	Version number of the object whose ACL is to be modified. Type: string

Response Elements

This response contains no elements.

Error Responses

No special error responses are returned. For details about error responses, see Table 2.

Sample Request

PUT /obj2?acl HTTP/1.1
User-Agent: curl/7.29.0
Host: examplebucket.obs.region.example.com
Accept: */*
Date: WED, 01 Jul 2015 04:42:34 GMT
Authorization: OBS H4IPJX0TQTHTHEBQQCEC:8xAODun1ofjkwHm8YhtN0QEcy9M=
Content-Length: 727

<AccessControlPolicy xmlns="http://obs.example.com/doc/2015-06-30/">
  <Owner> 
    <ID>b4bf1b36d9ca43d984fbcb9491b6fce9</ID> 
  </Owner>  
  <Delivered>false</Delivered>
  <AccessControlList> 
    <Grant> 
      <Grantee> 
        <ID>b4bf1b36d9ca43d984fbcb9491b6fce9</ID> 
      </Grantee>  
      <Permission>FULL_CONTROL</Permission> 
    </Grant>  
    <Grant> 
      <Grantee> 
        <ID>783fc6652cf246c096ea836694f71855</ID> 
      </Grantee>  
      <Permission>READ</Permission>
    </Grant>  
    <Grant> 
      <Grantee> 
        <Canned>Everyone</Canned> 
      </Grantee>  
      <Permission>READ</Permission> 
    </Grant> 
  </AccessControlList> 
</AccessControlPolicy>

Sample Response

HTTP/1.1 200 OK
Server: OBS
x-obs-request-id: 8DF400000163D3F0FD2A03D2D30B0542
x-obs-id-2: 32AAAUgAIAABAAAQAAEAABAAAQAAEAABCTjCqTmsA1XRpIrmrJdvcEWvZyjbztdd
Date: WED, 01 Jul 2015 04:42:34 GMT
Content-Length: 0

Parent topic: Operations on Objects

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Appending an Object

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Obtaining Object ACL Configuration

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