#===============================================================================
# Copyright 2005-2009, Tassos Koutsovassilis
#
# This file is part of Porcupine.
# Porcupine 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.
# Porcupine 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 Porcupine; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
#===============================================================================
"""
Porcupine HTTP caching filters
"""
from porcupine.filters.filter import PreProcessFilter
class ETag(PreProcessFilter):
@staticmethod
def generate_item_etag(context, item, registration):
if item != None:
return '%s%s' % (context.user._id, item.modified)
@staticmethod
def apply(context, item, registration, **kwargs):
etag = kwargs['generator'](context, item, registration)
if etag:
response = context.response
if_none_match = context.request.HTTP_IF_NONE_MATCH
if if_none_match != None and if_none_match == '"%s"' % etag:
response._code = 304
response.end()
else:
response.set_header('ETag', '"%s"' % etag)
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