Class: TDiary::Filter::SpamFilter

Inherits:
Filter
  • Object
show all
Defined in:
lib/tdiary/filter/spam.rb

Constant Summary collapse

TLD = 
%w(com net org edu gov mil int info biz name pro museum aero coop [a-z]{2})

Constants inherited from Filter

Filter::DEBUG_FULL, Filter::DEBUG_NONE, Filter::DEBUG_SPAM

Instance Method Summary collapse

Methods inherited from Filter

#debug

Methods included from ViewHelper

#base_url, #bot?

Constructor Details

#initialize(*args) ⇒ SpamFilter

Returns a new instance of SpamFilter.



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# File 'lib/tdiary/filter/spam.rb', line 14

def initialize( *args )
	super( *args )
	@filter_mode = true
	@max_uris = nil
	@max_rate = nil
	@bad_uri_patts_for_mails = false

	@bad_uri_patts = nil
	@bad_mail_patts = nil
	@bad_comment_patts = nil
	@bad_ip_addrs = nil

	@bad_uris = []
	@bad_mails_ext = []
	@bad_mails = []
	@bad_comments = []
	@bad_ips = []

	@date_limit = nil
end

Instance Method Details

#black_url?(body) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/tdiary/filter/spam.rb', line 181

def black_url?( body )
	body.scan( %r|https?://([^/:\s]+)| ) do |s|
		if @spamlookup_safe_domain_list.include?( s[0] )
			debug("#{s[0]} is safe host.", DEBUG_FULL)
			next
		end
		return true if name_base_black_domain?( s[0] ) || ip_base_black_domain?( s[0] )
	end
	return false
end

#comment_filter(diary, comment) ⇒ Object 



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# File 'lib/tdiary/filter/spam.rb', line 192

def comment_filter( diary, comment )
	update_config

	return false if black_url?( comment.body )

	if %r{/\.\/} =~ ENV['REQUEST_URI']
		debug( "REQUEST_URI contains %r{/\./}: #{ENV['REQUEST_URI']}" )
		comment.show = false
		return @filter_mode
	end

	if /^[\x20-\x7f]*$/io !~ comment.mail
		# mail address include not ASCII charactor
		debug( "invalid mail address: #{comment.mail.dump}" )
		comment.show = false
		return @filter_mode
	end

	if !comment.mail.empty? &&
			%r<@[^@]+\.(?:#{TLD.join("|")})$>i !~ comment.mail
		debug( "invalid domain name of mail address: #{comment.mail.dump}" )
		comment.show = false
		return @filter_mode
	end

	p = nil
	if @bad_mails.detect {|p| p =~ comment.mail} ||
			@bad_mails_ext.detect {|p| p =~ comment.mail}
		debug( "mail address blacklisted: /#{p}/ =~ #{comment.mail.dump}" )
		comment.show = false
		return @filter_mode
	end

	if @bad_comments.detect {|p| p =~ comment.body}
		debug( "comment contains bad words: /#{p}/" )
		comment.show = false
		return @filter_mode
	end

	if @bad_ips.detect {|p| p =~ @cgi.remote_addr}
		debug( "ip address blacklisted: /#{p}/ =~ #{@cgi.remote_addr}" )
		comment.show = false
		return @filter_mode
	end

	uris = URI.extract( comment.body, %w(http https ftp mailto) )
	unless uris.empty?
		if @max_uris && @max_uris >= 0 && uris.size > @max_uris
			debug( "too many URIs" )
			comment.show = false
			return @filter_mode
		end

		if @max_rate && @max_rate > 0 &&
				uris.join('').size * 100 / comment.body.gsub(/\s+/, '').size > @max_rate
			debug( "too many URI-chars" )
			comment.show = false
			return @filter_mode
		end

		uris.each do |uri|
			uri = uri.sub(/^ur[il]:/io, '')
			@bad_uris.each do |bad_uri|
				if bad_uri =~ uri
					debug( "comment contains bad words: #{uri}: #{bad_uri}" )
					comment.show = false
					return @filter_mode
				end
			end
		end
	end

	return true
end

#ip_base_black_domain?(domain) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/tdiary/filter/spam.rb', line 160

def ip_base_black_domain?( domain )
	@spamlookup_ip_list.split(/[\n\r]+/).inject(false) do |r, dnsbl|
		r || lookup(domain, dnsbl, true)
	end
end

#lookup(domain, dnsbl, iplookup = false) ⇒ Object 



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# File 'lib/tdiary/filter/spam.rb', line 166

def lookup(domain, dnsbl, iplookup = false)
	Timeout::timeout(1) do
		domain = IPSocket::getaddress( domain ).split(/\./).reverse.join(".") if iplookup
		address = Resolv.getaddress( "#{domain}.#{dnsbl}" )
		debug("lookup:#{domain}.#{dnsbl} address:#{address}: spam host.")
		return true
	end
rescue Timeout::Error, Resolv::ResolvTimeout
	debug("lookup:#{domain}.#{dnsbl}: safe host.")
	return false
rescue Resolv::ResolvError, Exception
	debug("unknown error:#{domain}.#{dnsbl}", DEBUG_FULL)
	return false
end

#name_base_black_domain?(domain) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/tdiary/filter/spam.rb', line 154

def name_base_black_domain?( domain )
	@spamlookup_domain_list.split(/[\n\r]+/).inject(false) do |r, dnsbl|
		r || lookup(domain, dnsbl)
	end
end

#referer_filter(referer) ⇒ Object 



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# File 'lib/tdiary/filter/spam.rb', line 267

def referer_filter( referer )
	return true unless referer

	update_config

	return false if black_url?( referer )

	if /#/ =~ referer then
		debug( "referer has a fragment: #{referer}" )
		return false
	end

	if %r{\A[^:]+://[^/]*\z} =~ referer
		debug( "referer has no path: #{referer}" )
		return false
	end

	@bad_uris.each do |bad_uri|
		if bad_uri =~ referer
			debug( "referer contains bad words: #{referer}: #{bad_uri}" )
			return false
		end
	end

	return true
end

#update_config ⇒ Object 



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# File 'lib/tdiary/filter/spam.rb', line 35

def update_config
	if @conf.options.include?('spamfilter.filter_mode')
		if @conf.options['spamfilter.filter_mode']
			@filter_mode = true # invisible
		else
			@filter_mode = false # drop
		end
	else
		@filter_mode = true # invisible
	end

	if @conf.options.include?('spamfilter.max_uris')
		@max_uris = @conf.options['spamfilter.max_uris'].to_i
	else
		@max_uris = nil
	end

	if @conf.options.include?('spamfilter.max_rate')
		@max_rate = @conf.options['spamfilter.max_rate'].to_i
	else
		@max_rate = nil
	end

	if @conf.options.include?('spamlookup.ip.list')
		@spamlookup_ip_list = @conf.options['spamlookup.ip.list']
	else
		@spamlookup_ip_list = "bsb.spamlookup.net"
	end

	if @conf.options.include?('spamlookup.domain.list')
		@spamlookup_domain_list = @conf.options['spamlookup.domain.list']
	else
		@spamlookup_domain_list = "bsb.spamlookup.net\nmulti.surbl.org\nrbl.bulkfeeds.jp"
	end

	if @conf.options.include?('spamlookup.safe_domain.list')
		@spamlookup_safe_domain_list = @conf.options['spamlookup.safe_domain.list']
	else
		@spamlookup_safe_domain_list = "www.google.com\nwww.google.co.jp\nsearch.yahoo.co.jp\nwww.bing.com"
	end

	if @conf.options.include?('spamfilter.bad_uri_patts_for_mails')
		@bad_uri_patts_for_mails =
				@conf.options['spamfilter.bad_uri_patts_for_mails']
	else
		@bad_uri_patts_for_mails = false
	end
	unless @bad_uri_patts_for_mails
		@bad_mails_ext = []
	end

	unless @conf.options.include?('spamfilter.bad_uri_patts')
		@conf.options['spamfilter.bad_uri_patts'] = ''
	end
	if @bad_uri_patts != @conf.options['spamfilter.bad_uri_patts']
		@bad_uri_patts = @conf.options['spamfilter.bad_uri_patts']
		tmp = @bad_uri_patts.split(/[\r\n]+/)
		tmp.delete_if {|t| t.empty?}
		if tmp.empty?
			@bad_uris = []
			@bad_mails_ext = []
		else
			@bad_uris = [
				%r!^[a-z]*://(?:[^/]*(?:#{tmp.join('|')})){2}!i,
				%r!^[a-z]*://[^/]*\b(?:#{tmp.join('|')})!i,
				%r!^[a-z]*://[^/]*(?:#{tmp.join('|')})\b!i,
				%r!^[a-z]*://.*\b(?:#{tmp.join('|')})\b!i,
				%r!^[a-z]*://[^/]*?[^./]{20,}[^/]*/?$!i,
				%r!^[a-z]*://[^/.]+(?:/|$)!i,
				%r<^[a-z]*://[^/]+\.(?!(?:#{TLD.join("|")})\b\.?)[^.:/]+(?:\.?(?::\d+)?(?:/|$))>i,
			]
			if @bad_uri_patts_for_mails
				@bad_mails_ext = [
					%r!\b(?:#{tmp.join('|')})!i,
					%r!(?:#{tmp.join('|')})\b!i,
				]
			end
		end
	end

	unless @conf.options.include?('spamfilter.bad_mail_patts')
		@conf.options['spamfilter.bad_mail_patts'] = ''
	end
	if @bad_mail_patts != @conf.options['spamfilter.bad_mail_patts']
		@bad_mail_patts = @conf.options['spamfilter.bad_mail_patts']
		tmp = @bad_mail_patts.split(/[\r\n]+/)
		tmp.delete_if {|t| t.empty?}
		@bad_mails = tmp.collect {|t| %r!#{t}!i rescue nil}.compact
	end

	unless @conf.options.include?('spamfilter.bad_comment_patts')
		@conf.options['spamfilter.bad_comment_patts'] = ''
	end
	if @bad_comment_patts != @conf.options['spamfilter.bad_comment_patts']
		@bad_comment_patts = @conf.options['spamfilter.bad_comment_patts']
		tmp = @bad_comment_patts.split(/[\r\n]+/)
		tmp.delete_if {|t| t.empty?}
		@bad_comments = tmp.collect {|t| %r!#{t}!i rescue nil}.compact
	end

	unless @conf.options.include?('spamfilter.bad_ip_addrs')
		@conf.options['spamfilter.bad_ip_addrs'] = ''
	end
	if @bad_ip_addrs != @conf.options['spamfilter.bad_ip_addrs']
		@bad_ip_addrs = @conf.options['spamfilter.bad_ip_addrs']
		tmp = @bad_ip_addrs.split(/[\r\n]+/)
		tmp.delete_if {|t| t.empty?}
		@bad_ips = tmp.collect do |t|
			if /\.$/ =~ t
				%r!#{Regexp.quote(t[0..-2]) + '.*'}!i
			else
				%r!#{Regexp.quote(t)}!i
			end
		end
	end

	nil
end