backend, pgsql storage: better items/notification handling, various fixes: - replaced const.VAL_AMODEL_ROSTER by const.VAL_AMODEL_PUBLISHER_ROSTER to follow change in pgsql schema - implemented whitelist access model - fixed bad access check during items retrieval (access was checked on recipient instead of requestor/sender) - getItemsData and notification filtering now use inline callbacks: this make these complexe workflows far mor easy to read, and clarity is imperative in these security critical sections. - publisher-roster access model now need to have only one owner, else it will fail. The idea is to use this model only when owner=publisher, else there is ambiguity on the roster to use to check access - replaced getNodeOwner by node.getOwners, as a node can have several owners - notifications filtering has been fixed in a similar way - psql: simplified withPEP method, pep_table argument is actually not needed - removed error.NotInRoster: error.Forbidden is used instead - notifications now notify all the owners, not only the first one

#!/usr/bin/python
#-*- coding: utf-8 -*-

# Copyright (C) 2016 Jérôme Poisson (goffi@goffi.org)

# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.

# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU Affero General Public License for more details.

# You should have received a copy of the GNU Affero General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.


from collections import namedtuple


ItemData = namedtuple('ItemData', ('item', 'access_model', 'config', 'categories', 'date'))
ItemData.__new__.__defaults__ = (None,) * (len(ItemData._fields) - 1) # Only item is mandatory