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#

# Usage:

# <Directory /where/ever>

# PythonOutputFilter gzipfilter

# SetOutputFilter gzipfilter

# </Directory>

from mod_python import apache

import os

import sys

import gzip

import cStringIO

from mod_python import apache

def compress(s):

sio = cStringIO.StringIO()

f = gzip.GzipFile(mode='wb', fileobj=sio)

f.write(s)

f.close()

return sio.getvalue()

def accepts_gzip(req):

if req.headers_in.has_key('accept-encoding'):

encodings = req.headers_in['accept-encoding']

return (encodings.find("gzip") != -1)

return 0

###

### main filter function

###

def outputfilter(filter):

if (filter.req.main or

not accepts_gzip(filter.req)):

# Presense of filter.req.main tells us that

# we are in a subrequest. We don't want to compress

# the data more than once, so we pass_on() in

# subrequests. We also pass_on() if the client

# does not accept gzip encoding, of course.

filter.pass_on()

else:

if not filter.req.sent_bodyct:

# the above test allows us to set the encoding once

# rather than every time the filter is invoked

filter.req.headers_out['content-encoding'] = 'gzip'

# loop through content, compressing

s = filter.read()

while s:

s = compress(s)

filter.write(s)

s = filter.read()

if s is None:

# this means we received an EOS, so we pass it on

# by closing the filter

filter.close()