Alexander Klimetschek updated OAK-4825:
    Attachment: OAK-4825.patch

Attached a possible patch (alternatively [on github 

Some smaller questions:
* does it need a new {{SyncResult.Status.DISABLE}} instead of 
* does it need more test cases 
(DefaultSyncContextTest#testSyncDisabledUserById() covers disable and 

Note: this change can be backported to the (current) 1.4 branch (a git 
cherry-pick worked fine).

> Support disabling of users instead of removal in DefaultSyncHandler
> -------------------------------------------------------------------
>                 Key: OAK-4825
>                 URL: https://issues.apache.org/jira/browse/OAK-4825
>             Project: Jackrabbit Oak
>          Issue Type: Improvement
>          Components: auth-external
>            Reporter: Alexander Klimetschek
>         Attachments: OAK-4825.patch
> The DefaultSyncHandler by default will remove (local) users when they are no 
> longer active in the external system aka no longer provided by the 
> ExternalIdentityProvider. It would be useful to have an option to _disable_ 
> users instead of removing them completely.
> This is good for use cases that need to keep the user's data around in the 
> JCR and can't just delete it. Also, we have seen cases where the user is only 
> temporarily removed from the external identity system (e.g. accidentally 
> removed from group that maps them to the JCR system and quickly added back), 
> where a full removal can do harm.
> (Note: There is an [option in the SyncContext 
> interface|https://github.com/apache/jackrabbit-oak/blob/trunk/oak-auth-external/src/main/java/org/apache/jackrabbit/oak/spi/security/authentication/external/SyncContext.java#L38]
>  to suppress purging, and the JMX sync commands such as 
> [purgeOrphanedUsers()|https://github.com/apache/jackrabbit-oak/blob/trunk/oak-auth-external/src/main/java/org/apache/jackrabbit/oak/spi/security/authentication/external/impl/jmx/Delegatee.java#L256]
>  "use" it. However, the JCR users look like "valid" users then locally. Even 
> if the authentication is done completely through the IDP and will fail 
> properly for these missing users, it can be difficult for other uses like 
> administration, monitoring, other application code to detect that such a user 
> is not active anymore.)

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