You can change the access control applied to a KiiObject by setting its ACL.
KiiObject ACL entries
A KiiObject ACL entry is composed of an action and a subject:
This item defines "what" the target user/group/thing can execute.
Representation in code *
What the target user/group/thing can execute
Read the KiiObject.
Update and delete the KiiObject.
* These symbols are defined in the KiiACLAction enumeration and can be specified like KiiACLAction.objectActionRead.
Note: The "bucketActionReadObjects" action set to a bucket's ACL allows the subject to unconditionally read all KiiObjects in the bucket, even if they are not permitted the "objectActionRead" action on the KiiObjects in the bucket. For understanding how the action works, see ACL Customization Examples.
This item defines "who" can execute.
Who can execute the designated action?
The specified user.
The members of the specified group.
The specified thing.
Any authenticated users.
See Subject for the definition of the "Any authenticated users" and "Anonymous users".
Managing a KiiObject's ACL
You can add and delete an ACL entry in a KiiObject's ACL. You can also get a list of ACL entries.
Adding a KiiObject ACL entry
Here is an example of permitting the objectActionRead action to KiiAnyAuthenticatedUser.
Create a KiiACL instance of the KiiObject by calling the objectACL() method.
Create a KiiACLEntry instance and pass it as the argument of the put(_:) method. Here, a KiiAnyAuthenticatedUser instance is specified as the ACL entry's subject so as to permit the action to any authenticated users. If you set a KiiAnonymousUser instance as the subject instead, you can permit the same action to anonymous users. If you set a specific KiiUser instance, the action will be permitted to that user instance.
Call the save(_:) method to send the request for updating the ACL to Kii Cloud.
See KiiACLEntry for more information about how you can specify other subjects like users and groups.
When you are adding multiple ACL entries, the entry registration is handled one by one. If an error occurs before all entries are registered, some entries will remain unregistered. In such a situation, you can get a list of ACL entries succeeded and failed to register from the succeeded and failed in the sample code.
Deleting a KiiObject ACL entry
To delete an ACL entry, create a KiiACLEntry instance with its grant set to false and save it. The ACL entry will be deleted from the server.
The following example deletes the ACL entry created in the previous sample code.
Note that the remove(_:) method of the KiiACL just deletes an ACL entry from the local modification list. The method does not delete an ACL entry set on the server. In the above sample code, we first register a request to remove the objectActionRead action from acl on the client and then execute the save(_:) method to reflect the request on the server. If you execute the remove(_:) method, it would remove the request from the ACL modification list, but not from the ACL on the server.
Getting a KiiObject's ACL
You can get the ACL set on a KiiObject. Even if you have not set any ACL entries in a KiiObject's ACL, you can get its default ACL.
Here is the sample code for getting a list of ACL entries as an NSArray.
Create a KiiACL instance of the KiiObject by executing the objectACL() method.
Call the listACLEntries(_:) method to get the KiiObject's ACL as an NSArray of the KiiACLEntry.
Parse through each ACL entry in the NSArray.
Trying to set an existing ACL entry will give you an error. By checking existing ACL entries beforehand as shown in this sample code, you can find which ACL entries should be set.
I got an error when I run my application multiple times
The ACL entry should be registered just once (e.g., in the initialization) and should not be registered again in the next run.
If you try to save an existing ACL entry, you will get an error. If your application runs the same ACL entry registration flow every time, therefore, you will get an error because the application attempts to re-register an already existing ACL entry.
When you are adding multiple ACL entries, the entry registration is handled one by one. If an error occurs before all entries are registered, some entries will remain unregistered. To recover from such a situation, you will first need to get a list of the existing ACL entries, remove the duplicating ACL entries from the ACL modification list, and then register remaining entries. See Getting a KiiObject's ACL to learn how to get the list of the existing ACL entries.