Custom Metadata population on asset upload

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I have a requirement of setting current logged in user's ID as value for a custom metadata field once I upload an asset in AEM DAM. eg. I logged in as admin,then "admin" need to be stored as value for a custom metadata field name "Owner'. How I can achieve it?

Thanks LM

[smacdonald2008 · Accepted solution]

Write a custom DAM handler that is called when an asset is uploaded:

https://helpx.adobe.com/experience-manager/using/damhandler.html

You need to read the user id using the User management API:

http://jackrabbit.apache.org/api/2.0/org/apache/jackrabbit/api/security/user/UserManager.html

You can get current user:

Session session = resourceResolver.adaptTo(Session.class);
    UserManager userManager = resourceResolver.adaptTo(UserManager.class);
    /* to get the current user */
    Authorizable auth = userManager.getAuthorizable(session.getUserID());

Get the id and set the asset using AssetManger API.