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#
# linkcheck.rb: tDiary filter for checking link to my site in TrackBack source site.
#
# specification:
# * if source site has no URI of my site of top page, it's spam!
# * reading only top of 100KB of source site.
# * no response over 10 sec, it's mybe spam.
#
# Copyright (C) 2007 by TADA Tadashi <sho@spc.gr.jp>
# Distributed under GPL2 or any later version.
#
require 'open-uri'
require 'timeout'
module TDiary::Filter
class LinkcheckFilter < Filter
def initialize( *args )
super( *args )
@filter_mode = @conf['spamfilter.filter_mode']
@filter_mode = true if @filter_mode == nil
end
def comment_filter( diary, comment )
if @conf['spamfilter.linkcheck'] == 0 then
debug( "No linkcheck to TrackBacks.", DEBUG_FULL )
return true
end
# check only TrackBack
return true unless comment.name == 'TrackBack'
dest_uri = @conf.index.dup
dest_uri[0, 0] = base_url if %r|^https?://|i !~ @conf.index
dest_uri.gsub!( %r|/\./|, '/' )
# TrackBack URI is the 1st line of comment.body.
src_uri, = comment.body.split( /\n/ )
unless %r|^https?://|i =~ src_uri then
debug( "TrackBack has bad source URI." )
comment.show = false
return @filter_mode
end
if src_uri.index( dest_uri ) == 0 then
debug( "TrackBack was sent to myself.", DEBUG_FULL )
return true
end
begin
Timeout::timeout( 10 ) do
open( src_uri ) do |f|
if f.read( 100 * 1024 ).include?( dest_uri ) then
debug( "TrackBack has links to me.", DEBUG_FULL )
return true
else
debug( "TrackBack dose not have links to me." )
comment.show = false
return @filter_mode
end
end
end
rescue Timeout::Error
debug( "TrackBack source was no response." )
comment.show = false
return @filter_mode
rescue
debug( "Cannot access to TrackBack source (#{$!})." )
comment.show = false
return @filter_mode
end
end
end
end
# Local Variables:
# mode: ruby
# indent-tabs-mode: t
# tab-width: 3
# ruby-indent-level: 3
# End:
|
