MarkLogic 12 EA 1 Product Documentation
xdmp.userPrivileges

xdmp.userPrivileges(
   user as String,
   [extSecId as (Number|String)],
   [secDbFirst as Boolean]
) as Sequence

Return IDs of all privileges that a user have.

Parameters
user	A user name.
extSecId	An external security config ID to search. This is needed only to find an external user. The default is the current App Server's external-security setting.
secDbFirst	A boolean value to specify whether to check security database before any specified external security. The default is the current App Server's internal-security setting, or true when running on the task server.

http://marklogic.com/xdmp/privileges/xdmp-user-privileges

xdmp.userPrivileges("ian")
=> [239871567325, 432987324]

MarkLogic 12 EA 1 Product Documentationxdmp.userPrivileges