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Diffstat (limited to 'lib/python2.7/site-packages/setoolsgui/setools/descriptors.py')
| -rw-r--r-- | lib/python2.7/site-packages/setoolsgui/setools/descriptors.py | 230 |
1 files changed, 0 insertions, 230 deletions
diff --git a/lib/python2.7/site-packages/setoolsgui/setools/descriptors.py b/lib/python2.7/site-packages/setoolsgui/setools/descriptors.py deleted file mode 100644 index eab9210..0000000 --- a/lib/python2.7/site-packages/setoolsgui/setools/descriptors.py +++ /dev/null @@ -1,230 +0,0 @@ -# Copyright 2015, Tresys Technology, LLC -# -# This file is part of SETools. -# -# SETools is free software: you can redistribute it and/or modify -# it under the terms of the GNU Lesser General Public License as -# published by the Free Software Foundation, either version 2.1 of -# the License, or (at your option) any later version. -# -# SETools 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 Lesser General Public License for more details. -# -# You should have received a copy of the GNU Lesser General Public -# License along with SETools. If not, see -# <http://www.gnu.org/licenses/>. -# -""" -SETools descriptors. - -These classes override how a class's attributes are get/set/deleted. -This is how the @property decorator works. - -See https://docs.python.org/3/howto/descriptor.html -for more details. -""" - -import re -from collections import defaultdict -from weakref import WeakKeyDictionary - -# -# Query criteria descriptors -# -# Implementation note: if the name_regex attribute value -# is changed the criteria must be reset. -# - - -class CriteriaDescriptor(object): - - """ - Single item criteria descriptor. - - Parameters: - name_regex The name of instance's regex setting attribute; - used as name_regex below. If unset, - regular expressions will never be used. - lookup_function The name of the SELinuxPolicy lookup function, - e.g. lookup_type or lookup_boolean. - default_value The default value of the criteria. The default - is None. - - Read-only instance attribute use (obj parameter): - policy The instance of SELinuxPolicy - name_regex This attribute is read to determine if - the criteria should be looked up or - compiled into a regex. If the attribute - does not exist, False is assumed. - """ - - def __init__(self, name_regex=None, lookup_function=None, default_value=None): - assert name_regex or lookup_function, "A simple attribute should be used if there is " \ - "no regex nor lookup function." - self.regex = name_regex - self.default_value = default_value - self.lookup_function = lookup_function - - # use weak references so instances can be - # garbage collected, rather than unnecessarily - # kept around due to this descriptor. - self.instances = WeakKeyDictionary() - - def __get__(self, obj, objtype=None): - if obj is None: - return self - - return self.instances.setdefault(obj, self.default_value) - - def __set__(self, obj, value): - if not value: - self.instances[obj] = None - elif self.regex and getattr(obj, self.regex, False): - self.instances[obj] = re.compile(value) - elif self.lookup_function: - lookup = getattr(obj.policy, self.lookup_function) - self.instances[obj] = lookup(value) - else: - self.instances[obj] = value - - -class CriteriaSetDescriptor(CriteriaDescriptor): - - """Descriptor for a set of criteria.""" - - def __set__(self, obj, value): - if not value: - self.instances[obj] = None - elif self.regex and getattr(obj, self.regex, False): - self.instances[obj] = re.compile(value) - elif self.lookup_function: - lookup = getattr(obj.policy, self.lookup_function) - self.instances[obj] = set(lookup(v) for v in value) - else: - self.instances[obj] = set(value) - - -class RuletypeDescriptor(object): - - """ - Descriptor for a list of rule types. - - Parameters: - validator The name of the SELinuxPolicy ruletype - validator function, e.g. validate_te_ruletype - default_value The default value of the criteria. The default - is None. - - Read-only instance attribute use (obj parameter): - policy The instance of SELinuxPolicy - """ - - def __init__(self, validator): - self.validator = validator - - # use weak references so instances can be - # garbage collected, rather than unnecessarily - # kept around due to this descriptor. - self.instances = WeakKeyDictionary() - - def __get__(self, obj, objtype=None): - if obj is None: - return self - - return self.instances.setdefault(obj, None) - - def __set__(self, obj, value): - if value: - validate = getattr(obj.policy, self.validator) - validate(value) - self.instances[obj] = value - else: - self.instances[obj] = None - - -# -# NetworkX Graph Descriptors -# -# These descriptors are used to simplify all -# of the dictionary use in the NetworkX graph. -# - - -class NetworkXGraphEdgeDescriptor(object): - - """ - Descriptor base class for NetworkX graph edge attributes. - - Parameter: - name The edge property name - - Instance class attribute use (obj parameter): - G The NetworkX graph - source The edge's source node - target The edge's target node - """ - - def __init__(self, propname): - self.name = propname - - def __get__(self, obj, objtype=None): - if obj is None: - return self - - return obj.G[obj.source][obj.target][self.name] - - def __set__(self, obj, value): - raise NotImplementedError - - def __delete__(self, obj): - raise NotImplementedError - - -class EdgeAttrDict(NetworkXGraphEdgeDescriptor): - - """A descriptor for edge attributes that are dictionaries.""" - - def __set__(self, obj, value): - # None is a special value to initialize the attribute - if value is None: - obj.G[obj.source][obj.target][self.name] = defaultdict(list) - else: - raise ValueError("{0} dictionaries should not be assigned directly".format(self.name)) - - def __delete__(self, obj): - obj.G[obj.source][obj.target][self.name].clear() - - -class EdgeAttrIntMax(NetworkXGraphEdgeDescriptor): - - """ - A descriptor for edge attributes that are non-negative integers that always - keep the max assigned value until re-initialized. - """ - - def __set__(self, obj, value): - # None is a special value to initialize - if value is None: - obj.G[obj.source][obj.target][self.name] = 0 - else: - current_value = obj.G[obj.source][obj.target][self.name] - obj.G[obj.source][obj.target][self.name] = max(current_value, value) - - -class EdgeAttrList(NetworkXGraphEdgeDescriptor): - - """A descriptor for edge attributes that are lists.""" - - def __set__(self, obj, value): - # None is a special value to initialize - if value is None: - obj.G[obj.source][obj.target][self.name] = [] - else: - raise ValueError("{0} lists should not be assigned directly".format(self.name)) - - def __delete__(self, obj): - # in Python3 a .clear() function was added for lists - # keep this implementation for Python 2 compat - del obj.G[obj.source][obj.target][self.name][:] |