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# Copyright (c) 2010-2012 OpenStack Foundation
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
# implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import six
class HeaderKeyDict(dict):
"""
A dict that title-cases all keys on the way in, so as to be
case-insensitive.
Note that all keys and values are expected to be wsgi strings,
though some allowances are made when setting values.
"""
def __init__(self, base_headers=None, **kwargs):
if base_headers:
self.update(base_headers)
self.update(kwargs)
@staticmethod
def _title(s):
if six.PY2:
return s.title()
else:
return s.encode('latin1').title().decode('latin1')
def update(self, other):
if hasattr(other, 'keys'):
for key in other.keys():
self[self._title(key)] = other[key]
else:
for key, value in other:
self[self._title(key)] = value
def __getitem__(self, key):
return dict.get(self, self._title(key))
def __setitem__(self, key, value):
key = self._title(key)
if value is None:
self.pop(key, None)
elif six.PY2 and isinstance(value, six.text_type):
return dict.__setitem__(self, key, value.encode('utf-8'))
elif six.PY3 and isinstance(value, six.binary_type):
return dict.__setitem__(self, key, value.decode('latin-1'))
else:
return dict.__setitem__(self, key, str(value))
def __contains__(self, key):
return dict.__contains__(self, self._title(key))
def __delitem__(self, key):
return dict.__delitem__(self, self._title(key))
def get(self, key, default=None):
return dict.get(self, self._title(key), default)
def setdefault(self, key, value=None):
if key not in self:
self[key] = value
return self[key]
def pop(self, key, default=None):
return dict.pop(self, self._title(key), default)
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