python-keycloak/keycloak/authorization/policy.py

# -*- coding: utf-8 -*-
#
# The MIT License (MIT)
#
# Copyright (C) 2017 Marcos Pereira <marcospereira.mpj@gmail.com>
#
# Permission is hereby granted, free of charge, to any person obtaining a copy of
# this software and associated documentation files (the "Software"), to deal in
# the Software without restriction, including without limitation the rights to
# use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
# the Software, and to permit persons to whom the Software is furnished to do so,
# subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in all
# copies or substantial portions of the Software.
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# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
# FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
# COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
# IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
# CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

from ..exceptions import KeycloakAuthorizationConfigError


class Policy:
    """
    A policy defines the conditions that must be satisfied to grant access to an object.
    Unlike permissions, you do not specify the object being protected but rather the conditions
    that must be satisfied for access to a given object (for example, resource, scope, or both).
    Policies are strongly related to the different access control mechanisms (ACMs) that you can use to
    protect your resources. With policies, you can implement strategies for attribute-based access control
    (ABAC), role-based access control (RBAC), context-based access control, or any combination of these.

    https://keycloak.gitbooks.io/documentation/authorization_services/topics/policy/overview.html

    """

    def __init__(self, name, type, logic, decision_strategy):
        self._name = name
        self._type = type
        self._logic = logic
        self._decision_strategy = decision_strategy
        self._roles = []
        self._permissions = []

    def __repr__(self):
        return "<Policy: %s (%s)>" % (self.name, self.type)

    def __str__(self):
        return "Policy: %s (%s)" % (self.name, self.type)

    @property
    def name(self):
        return self._name

    @name.setter
    def name(self, value):
        self._name = value

    @property
    def type(self):
        return self._type

    @type.setter
    def type(self, value):
        self._type = value

    @property
    def logic(self):
        return self._logic

    @logic.setter
    def logic(self, value):
        self._logic = value

    @property
    def decision_strategy(self):
        return self._decision_strategy

    @decision_strategy.setter
    def decision_strategy(self, value):
        self._decision_strategy = value

    @property
    def roles(self):
        return self._roles

    @property
    def permissions(self):
        return self._permissions

    def add_role(self, role):
        """
        Add keycloak role in policy.

        :param role: keycloak role.
        :return:
        """
        if self.type != 'role':
            raise KeycloakAuthorizationConfigError(
                "Can't add role. Policy type is different of role")
        self._roles.append(role)

    def add_permission(self, permission):
        """
        Add keycloak permission in policy.

        :param permission: keycloak permission.
        :return:
        """
        self._permissions.append(permission)