The CMSUser Velocity Viewtool allows velocity access to the logged in user object and user properties.
The following example shows how the CMSUsersWebAPI Viewtool is mapped in the toolbox.xml file:
<tool>
<key>cmsuser</key>
<scope>request</scope>
<class>com.dotcms.rendering.velocity.viewtools.CMSUsersWebAPI</class>
</tool>