143 lines
4.7 KiB
Python
143 lines
4.7 KiB
Python
# -*- coding: utf-8; -*-
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################################################################################
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#
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# Rattail -- Retail Software Framework
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# Copyright © 2010-2017 Lance Edgar
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#
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# This file is part of Rattail.
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#
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# Rattail is free software: you can redistribute it and/or modify it under the
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# terms of the GNU General Public License as published by the Free Software
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# Foundation, either version 3 of the License, or (at your option) any later
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# version.
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#
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# Rattail is distributed in the hope that it will be useful, but WITHOUT ANY
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# WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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# FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
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# details.
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#
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# You should have received a copy of the GNU General Public License along with
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# Rattail. If not, see <http://www.gnu.org/licenses/>.
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#
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################################################################################
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"""
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Authentication & Authorization
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"""
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from __future__ import unicode_literals, absolute_import
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import logging
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from rattail import enum
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from rattail.db import model
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from rattail.util import prettify, NOTSET
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from zope.interface import implementer
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from pyramid.interfaces import IAuthorizationPolicy
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from pyramid.security import remember, forget, Everyone, Authenticated
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from tailbone.db import Session
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log = logging.getLogger(__name__)
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def login_user(request, user, timeout=NOTSET):
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"""
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Perform the steps necessary to login the given user. Note that this
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returns a ``headers`` dict which you should pass to the redirect.
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"""
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user.record_event(enum.USER_EVENT_LOGIN)
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headers = remember(request, user.uuid)
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if timeout is NOTSET:
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timeout = session_timeout_for_user(user)
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log.debug("setting session timeout for '{}' to {}".format(user.username, timeout))
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set_session_timeout(request, timeout)
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return headers
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def logout_user(request):
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"""
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Perform the logout action for the given request. Note that this returns a
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``headers`` dict which you should pass to the redirect.
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"""
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user = request.user
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if user:
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user.record_event(enum.USER_EVENT_LOGOUT)
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request.session.delete()
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request.session.invalidate()
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headers = forget(request)
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return headers
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def session_timeout_for_user(user):
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"""
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Returns the "max" session timeout for the user, according to roles
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"""
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from rattail.db.auth import authenticated_role
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roles = user.roles + [authenticated_role(Session())]
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timeouts = [role.session_timeout for role in roles
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if role.session_timeout is not None]
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if timeouts and 0 not in timeouts:
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return max(timeouts)
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def set_session_timeout(request, timeout):
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"""
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Set the server-side session timeout to the given value.
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"""
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request.session['_timeout'] = timeout or None
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@implementer(IAuthorizationPolicy)
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class TailboneAuthorizationPolicy(object):
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def permits(self, context, principals, permission):
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from rattail.db import model
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from rattail.db.auth import has_permission
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for userid in principals:
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if userid not in (Everyone, Authenticated):
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if context.request.user and context.request.user.uuid == userid:
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return context.request.has_perm(permission)
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else:
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assert False # should no longer happen..right?
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user = Session.query(model.User).get(userid)
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if user:
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if has_permission(Session(), user, permission):
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return True
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if Everyone in principals:
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return has_permission(Session(), None, permission)
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return False
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def principals_allowed_by_permission(self, context, permission):
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raise NotImplementedError
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def add_permission_group(config, key, label=None, overwrite=True):
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"""
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Add a permission group to the app configuration.
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"""
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def action():
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perms = config.get_settings().get('tailbone_permissions', {})
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if key not in perms or overwrite:
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group = perms.setdefault(key, {'key': key})
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group['label'] = label or prettify(key)
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config.add_settings({'tailbone_permissions': perms})
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config.action(None, action)
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def add_permission(config, groupkey, key, label=None):
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"""
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Add a permission to the app configuration.
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"""
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def action():
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perms = config.get_settings().get('tailbone_permissions', {})
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group = perms.setdefault(groupkey, {'key': groupkey})
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group.setdefault('label', prettify(groupkey))
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perm = group.setdefault('perms', {}).setdefault(key, {'key': key})
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perm['label'] = label or prettify(key)
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config.add_settings({'tailbone_permissions': perms})
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config.action(None, action)
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