# $Id$
# Copyright (C) 2005  Shugo Maeda <shugo@ruby-lang.org>
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
#    notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
#    notice, this list of conditions and the following disclaimer in the
#    documentation and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
# SUCH DAMAGE.

class SpamFilter < Plugin
  def init_plugin
    begin
      @mail_store.get_mailbox("spam")
    rescue NoMailboxError
      mailbox = StaticMailbox.new(@mail_store, "spam", "flags" => "")
      mailbox.save
      @logger.info("mailbox created: spam")
    end
  end

  def filter(mail)
    IO.popen("bsfilter", "w") do |bsfilter|
      bsfilter.print(mail)
    end
    if $?.exitstatus == 0
      @logger.debug("spam: uid=#{mail.uid}")
      return "spam"
    else
      @logger.debug("clean: uid=#{mail.uid}")
      return nil
    end
  end

  def on_copy(mail, mailbox_name)
    if mailbox_name == "spam"
      @logger.info("added to the spam token database: uid=#{mail.uid}")
      IO.popen("bsfilter --add-spam --update", "w") do |bsfilter|
        bsfilter.print(mail)
      end
    end
  end

  def on_delete_mail(mail)
    if mail.mailbox.name == "spam"
      @logger.info("added to the clean token database: uid=#{mail.uid}")
      IO.popen("bsfilter --add-clean --update", "w") do |bsfilter|
        bsfilter.print(mail)
      end
    end
  end
end