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# GNU MediaGoblin -- federated, autonomous media hosting
# Copyright (C) 2011, 2012 MediaGoblin contributors. See AUTHORS.
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program 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 Affero General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
import logging
import re
from mediagoblin import meddleware
_log = logging.getLogger(__name__)
class TrimWhiteSpaceMeddleware(meddleware.BaseMeddleware):
_setup_plugin_called = 0
RE_MULTI_WHITESPACE = re.compile(br'(\s)\s+', re.M)
def process_response(self, request, response):
"""Perform very naive html tidying by removing multiple whitespaces"""
# werkzeug.BaseResponse has no content_type attr, this comes via
# werkzeug.wrappers.CommonRequestDescriptorsMixin (part of
# wrappers.Response)
if getattr(response ,'content_type', None) != 'text/html':
return
# This is a tad more complex than needed to be able to handle
# response.data and response.body, depending on whether we have
# a werkzeug Resonse or a webob one. Let's kill webob soon!
if hasattr(response, 'body') and not hasattr(response, 'data'):
# Old-style webob Response object.
# TODO: Remove this once we transition away from webob
resp_attr = 'body'
else:
resp_attr = 'data'
# Don't flatten iterator to list when we fudge the response body
# (see werkzeug.Response documentation)
response.implicit_sequence_conversion = False
# Set the tidied text. Very naive tidying for now, just strip all
# subsequent whitespaces (this preserves most newlines)
setattr(response, resp_attr, re.sub(
TrimWhiteSpaceMeddleware.RE_MULTI_WHITESPACE, br'\1',
getattr(response, resp_attr)))
@classmethod
def setup_plugin(cls):
"""Set up this meddleware as a plugin during 'setup' hook"""
global _log
if cls._setup_plugin_called:
_log.info('Trim whitespace plugin was already set up.')
return
_log.debug('Trim whitespace plugin set up.')
cls._setup_plugin_called += 1
# Append ourselves to the list of enabled Meddlewares
meddleware.ENABLED_MEDDLEWARE.append(
'{}:{}'.format(cls.__module__, cls.__name__))
hooks = {
'setup': TrimWhiteSpaceMeddleware.setup_plugin
}
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