Contents

#          Copyright (c) 2006 Michael Fellinger [e-mail]
# All files in this distribution are subject to the terms of the Ruby license.

# gzip_filter.rb
#
# Use this to compress "large" pages with gzip.  All major browsers support gzipped pages.
# This filter brought to you by your friends in #ramaze: Pistos, manveru, rikur and Kashia.
#
# Usage:
# in start.rb:
#
# require 'path/to/gzip-filter'
# Ramaze::Dispatcher::Action::FILTER << Ramaze::Filter::Gzip

require 'zlib'

module Ramaze
  module Filter
    class Gzip

      trait :enabled => true
      trait :threshold => 32768 # bytes

      class << self

        include Ramaze::Trinity

        # Enables being plugged into Dispatcher::Action::FILTER

        def call( response, options = {} )
          return response if not trait[ :enabled ]
          return response if response.body.nil?
          return response if response.body.respond_to?( :read )

          accepts = request.env[ 'HTTP_ACCEPT_ENCODING' ]
          return response if accepts.nil? || ( accepts !~ /(x-gzip|gzip)/ )

          if response.content_type == 'text/html' && response.body.size > trait[ :threshold ]
            output = StringIO.new
            def output.close
              # Zlib closes the file handle, so we want to circumvent this
              rewind
            end
            gz = Zlib::GzipWriter.new( output )
            gz.write( response.body )
            gz.close

            response.body = output.string
            response.header[ 'Content-encoding' ] = 'gzip'
          end

          response
        end
      end
    end
  end
end

Version data entries

1 entries across 1 versions & 1 rubygems

Version	Path
ramaze-0.2.0	lib/ramaze/contrib/gzip_filter.rb