Here is a new webservice set called Activity that allows to query the user events. This can be very useful to control the user activity externally to Sakai.

-getUserActivityByType returns all the events of a type from a user

http://localhost:8080/sakai-ws/rest/activity/getUserActivityByType?sessionid=ed446383-8e95-48c9-9a62-d71cbe619fa1&eid=admin&eventType=annc.new

-getUserLogonActivity returns all the logins of a user

http://localhost:8080/sakai-ws/rest/activity/getUserLogonActivity?sessionid=ed446383-8e95-48c9-9a62-d71cbe619fa1&eid=admin

-getUserActivity and getUserActivityStringDates return the events of a user between 2 dates.

http://localhost:8080/sakai-ws/rest/activity/getUserActivityRestVersion?sessionid=ed446383-8e95-48c9-9a62-d71cbe619fa1&eid=admin&startDate=2013-09-10%2020:00:00&endDate=2018-09-10%2020:00:00

NOTE: There are 2 versions becuase when we call it as a REST, it needs to convert the string to dates (getUserActivityStringDates) and when calling it as a webservice, the parameters are directly dates.

There is an option to do this with only one webservice using this:
https://cirovladimir.wordpress.com/2012/09/18/apache-cxf-jax-rs-class-java-util-date-can-not-be-instantiated-using-a-constructor-with-a-single-string-argument/

But it needs to create the ParameterHandler and a lot of extra steps. If you consider that having 2 version (one for REST calls and another for the traditional calls) is fine, then this patch works.