providing event Hooks/Triggers to end users

Today, I've been strugling at the following need : how do I take automatic actions when an account get created in a Wiki ?

Would be great if we can bring (end) users the ability to trigger POST actions or groovy scripts upon some events in the wiki.

<martinus__> VincentMassol[m]: in GitLab there is something extremely useful, they call it System Hooks. https://docs.gitlab.com/ee/system_hooks/system_hooks.html#doc-nav and also Web Hooks https://docs.gitlab.com/ce/user/project/integrations/webhooks.html#doc-nav , a system like this could be useful to xwiki one day. (Just thinking loud here).
<VincentMassol[m]> sure but we go one step further
<VincentMassol[m]> since you can react to any event directly inside xwiki
<VincentMassol[m]> so you could also send a POST to an external resource if need be, but yes it could be interesting to have that built in
<VincentMassol[m]> good idea
<VincentMassol[m]> would be great if you could raise an "Idea" type issue in jira
<VincentMassol[m]> it could actually be a nice project for a GSOC