When assigning a user to a group, is it possible to call a subscriber? Are there available events to this action? If so, in which product?
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When assigning a user to a group, is it possible to call a subscriber? Are there available events to this action? If so, in which product?
No. It does not appear that Products.PluggableAuthService.plugins.ZODBGroupManager.ZODBGroupManager.addPrincipalToGroup nor anything that calls it notifies any event.
I would suggest that if you have an add-on that needs this:
(1) Submit a feature request ticket at https://dev.plone.org — it would be nice to have this, I am pretty sure that I could use it too.
(2) For now, have your add-on monkey patch ZODBGroupManager.addPrincipalToGroup() method wrapping the original function with an event notification of your own devising called after the user is added to the group. https://stackoverflow.com/search?q=monkey+patch+python