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