Automatically register users vising the application for the first time

[ggonzr]

If a new user attempts to use a private endpoint, and it is not already registered in the database, an unhandled exception will be raised as it is not possible to retrieve the user's role and permissions, e.g: when a new user subscribes to a request to receive updates on its processing. The exception happens as there's always assumed the user sending the request exists in the database:

cmsPdmV/mcm/tools/user_management.py

Lines 30 to 36 in 29c2edf

	user = self.__user_cache.get(username)
	if not user:
	user = self.__db.get(username)
	self.__user_cache.set(username, user, timeout=self.CACHE_TIMEOUT)
	self.user_dict['role'] = user['role']
	# we take email from DB if user is registered, else we use ADFS

Expected Behavior

New users should be automatically registered with the user role and there should not be any error regarding retrieving the user's role.

Current Behavior

The endpoint fails as there's an unhandled exception for taking the user's role.

[vlimant]

that'd be nice. can this be done easily @ggonzr ?