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# -*- coding: utf-8 -*-
# gzip_middleware.py
# Copyright (C) 2013 LEAP
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU 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 General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
"""
Gzip middleware for WSGI apps.
"""
from six import StringIO
from gzip import GzipFile
class GzipMiddleware(object):
"""
GzipMiddleware class for WSGI.
"""
def __init__(self, app, compresslevel=9):
self.app = app
self.compresslevel = compresslevel
def __call__(self, environ, start_response):
if 'gzip' not in environ.get('HTTP_ACCEPT_ENCODING', ''):
return self.app(environ, start_response)
buffer = StringIO.StringIO()
output = GzipFile(
mode='wb',
compresslevel=self.compresslevel,
fileobj=buffer
)
start_response_args = []
def dummy_start_response(status, headers, exc_info=None):
start_response_args.append(status)
start_response_args.append(headers)
start_response_args.append(exc_info)
return output.write
app_iter = self.app(environ, dummy_start_response)
for line in app_iter:
output.write(line)
if hasattr(app_iter, 'close'):
app_iter.close()
output.close()
buffer.seek(0)
result = buffer.getvalue()
headers = []
for name, value in start_response_args[1]:
if name.lower() != 'content-length':
headers.append((name, value))
headers.append(('Content-Length', str(len(result))))
headers.append(('Content-Encoding', 'gzip'))
start_response(start_response_args[0], headers, start_response_args[2])
buffer.close()
return [result]
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