text: # -*- coding: utf-8 -*-
  ##############################################################################
  #
  #    OpenERP, Open Source Management Solution
  #    Copyright (C) 2004-2010 Tiny SPRL (<http://tiny.be>).
  #
  #    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 openerp.osv import fields, osv
  from openerp import SUPERUSER_ID
  
  class res_users(osv.osv):
      _name = 'res.users'
      _inherit = 'res.users'
  
      def _is_share(self, cr, uid, ids, name, args, context=None):
          res = {}
          for user in self.browse(cr, uid, ids, context=context):
              res[user.id] = not self.has_group(cr, user.id, 'base.group_user')
          return res
  
      def _get_users_from_group(self, cr, uid, ids, context=None):
          result = set()
          groups = self.pool['res.groups'].browse(cr, uid, ids, context=context)
          # Clear cache to avoid perf degradation on databases with thousands of users 
          groups.invalidate_cache()
          for group in groups:
              result.update(user.id for user in group.users)
          return list(result)
  
      _columns = {
          'share': fields.function(_is_share, string='Share User', type='boolean',
              store={
                  'res.users': (lambda self, cr, uid, ids, c={}: ids, None, 50),
                  'res.groups': (_get_users_from_group, None, 50),
              }, help="External user with limited access, created only for the purpose of sharing data."),
       }
  
  
  class res_groups(osv.osv):
      _name = "res.groups"
      _inherit = 'res.groups'
      _columns = {
          'share': fields.boolean('Share Group', readonly=True,
                      help="Group created to set access rights for sharing data with some users.")
      }
  
      def init(self, cr):
          # force re-generation of the user groups view without the shared groups
          self.update_user_groups_view(cr, SUPERUSER_ID)
          parent_class = super(res_groups, self)
          if hasattr(parent_class, 'init'):
              parent_class.init(cr)
  
      def get_application_groups(self, cr, uid, domain=None, context=None):
          if domain is None:
              domain = []
          domain.append(('share', '=', False))
          return super(res_groups, self).get_application_groups(cr, uid, domain=domain, context=context)
  
  
  
  # vim:expandtab:smartindent:tabstop=4:softtabstop=4:shiftwidth=4:
  