com.amazonaws.services.s3.model

Class AccessControlList

java.lang.Object

com.amazonaws.services.s3.model.AccessControlList

All Implemented Interfaces:

Serializable

public class AccessControlList
extends Object
implements Serializable

Represents an Amazon S3 Access Control List (ACL), including the ACL's set of grantees and the permissions assigned to each grantee.

Each bucket and object in Amazon S3 has an ACL that defines its access control policy. When a request is made, Amazon S3 authenticates the request using its standard authentication procedure and then checks the ACL to verify the sender was granted access to the bucket or object. If the sender is approved, the request proceeds. Otherwise, Amazon S3 returns an error.

An ACL contains a list of grants. Each grant consists of one grantee and one permission. ACLs only grant permissions; they do not deny them.

For convenience, some commonly used ACLs are defined in CannedAccessControlList.

Note: Bucket and object ACLs are completely independent; an object does not inherit an ACL from its bucket. For example, if you create a bucket and grant write access to another user, you will not be able to access the user's objects unless the user explicitly grants access. This also applies if you grant anonymous write access to a bucket. Only the user "anonymous" will be able to access objects the user created unless permission is explicitly granted to the bucket owner.

Important: Do not grant the anonymous group write access to buckets, as you will have no control over the objects others can store and their associated charges. For more information, see Grantee and Permissions.

See Also:

CannedAccessControlList, Serialized Form

Constructor Summary

Constructors

Constructor and Description
AccessControlList()

Method Summary

Methods

Modifier and Type	Method and Description
Set<Grant>	getGrants() Gets the set of Grant objects in this access control list (ACL).
Owner	getOwner() Gets the owner of the AccessControlList.
void	grantAllPermissions(Grant... grantsVarArg) Adds a set of grantee/permission pairs to the access control list (ACL), where each item in the set is a Grant object.
void	grantPermission(Grantee grantee, Permission permission) Adds a grantee to the access control list (ACL) with the given permission.
void	revokeAllPermissions(Grantee grantee) Revokes the permissions of a grantee by removing the grantee from the access control list (ACL).
void	setOwner(Owner owner) For internal use only.
String	toString()

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

AccessControlList

public AccessControlList()

Method Detail

getOwner

public Owner getOwner()

Gets the owner of the AccessControlList.

Every bucket and object in Amazon S3 has an owner, the user that created the bucket or object. The owner of a bucket or object cannot be changed. However, if the object is overwritten by another user (deleted and rewritten), the new object will have a new owner.

Note: Even the owner is subject to the access control list (ACL). For example, if an owner does not have Permission.Read access to an object, the owner cannot read that object. However, the owner of an object always has write access to the access control policy (Permission.WriteAcp) and can change the ACL to read the object.

Returns:

The owner for this AccessControlList.

setOwner

public void setOwner(Owner owner)

For internal use only. Sets the owner on this access control list (ACL). This method is only intended for internal use by the library. The owner of a bucket or object cannot be changed. However the object can be overwritten by the new desired owner (deleted and rewritten).

Parameters:

owner - The owner for this ACL.

grantPermission

public void grantPermission(Grantee grantee,
                   Permission permission)

Adds a grantee to the access control list (ACL) with the given permission. If this access control list already contains the grantee (i.e. the same grantee object) the permission for the grantee will be updated.

Parameters:

grantee - The grantee to whom the permission will apply.

permission - The permission to apply to the grantee.

grantAllPermissions

public void grantAllPermissions(Grant... grantsVarArg)

Adds a set of grantee/permission pairs to the access control list (ACL), where each item in the set is a Grant object.

Parameters:

grantsVarArg - A collection of Grant objects

revokeAllPermissions

public void revokeAllPermissions(Grantee grantee)

Revokes the permissions of a grantee by removing the grantee from the access control list (ACL).

Parameters:

grantee - The grantee to remove from this ACL.

getGrants

public Set<Grant> getGrants()

Gets the set of Grant objects in this access control list (ACL).

Returns:

The set of Grant objects in this ACL.

toString

public String toString()

Overrides:

toString in class Object