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# Copyright 2017 Canonical Ltd.
# Licensed under the LGPLv3, see LICENCE file for details.
try:
from collections.abc import Mapping
except ImportError:
from collections import Mapping
class AuthContext(Mapping):
''' Holds a set of keys and values relevant to authorization.
It is passed as an argument to authorization checkers, so that the checkers
can access information about the context of the authorization request.
It is immutable - values can only be added by copying the whole thing.
'''
def __init__(self, somedict=None):
if somedict is None:
somedict = {}
self._dict = dict(somedict)
self._hash = None
def with_value(self, key, val):
''' Return a copy of the AuthContext object with the given key and
value added.
'''
new_dict = dict(self._dict)
new_dict[key] = val
return AuthContext(new_dict)
def __getitem__(self, key):
return self._dict[key]
def __len__(self):
return len(self._dict)
def __iter__(self):
return iter(self._dict)
def __hash__(self):
if self._hash is None:
self._hash = hash(frozenset(self._dict.items()))
return self._hash
def __eq__(self, other):
return self._dict == other._dict
class ContextKey(object):
'''Provides a unique key suitable for use as a key into AuthContext.'''
def __init__(self, name):
'''Creates a context key using the given name. The name is
only for informational purposes.
'''
self._name = name
def __str__(self):
return '%s#%#x' % (self._name, id(self))
def __repr__(self):
return 'context_key(%r, %#x)' % (self._name, id(self))
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