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#!/usr/bin/ruby -Ku

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#--
# CyborgHood, a distributed system management software.
# Copyright (c) 2009 Marc Dequènes (Duck) <Duck@DuckCorp.org>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
#++

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# http://www.ruby-doc.org/stdlib/libdoc/net/imap/rdoc/index.html

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APP_ROOT = File.dirname(File.expand_path(__FILE__))
Dir.chdir(APP_ROOT)
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$: << "./lib"

#require 'socket'
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require 'tempfile'
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require 'shellwords'
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require 'cyborghood/imap'
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require 'cyborghood/mail'
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require 'cyborghood/objects'
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require 'cyborghood/services/dns'
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require 'fileutils'
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#Socket.gethostname

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module CyborgHood
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# not yet ready to be a real Cyborg
class Postman #< Cyborg
include GetText
bindtextdomain(PRODUCT + "_" + self.human_name, {:path => File.join(APP_ROOT, "locale"), :charset => "UTF-8"})
textdomain(PRODUCT + "_" + self.human_name)

def initialize
# load config
Config.load(self.human_name.downcase)
@config = Config.instance

ldap_config = @config.ldap
ldap_config.logger = logger
ActiveLdap::Base.establish_connection(ldap_config.marshal_dump)

# setup logs
unless @config.log.nil?
logger.output_level(@config.log.console_level) unless @config.log.console_level.nil?
logger.log_to_file(@config.log.file) unless @config.log.file.nil?
end

@current_thread = Thread.current
@stop_asap = false
@waiting = false

logger.info "Bot '#{self.human_name}' loaded"
end

def run
imap = IMAP.new(@config.imap)
until @stop_asap
t = Time.now.to_i
logger.debug "Starting mail check"
check_mails(imap)
logger.debug "Mail check finished"
t2 = Time.now.to_i
sleep_time = @config.imap.min_check_interval - (t2 - t)
if sleep_time > 0
logger.debug "Having a break before new check..."
@waiting = true
begin
sleep(sleep_time)
rescue
end
@waiting = false
end
end
logger.info "Bot was asked to stop..." if @stop_asap
logger.info "Bot terminating"
end

def check_mails(imap)
imap.check_mail do |msg|
if @stop_asap
logger.info "Bot was asked to stop..."
break
end

mail = Mail.new(msg.content)
logger.info "Received mail with ID '#{mail.message_id}': #{mail.from_addrs} -> #{mail.to_addrs} (#{mail.subject})"

# ignore mails not signed or encrypted
unless mail.is_pgp_signed? or mail.is_pgp_encrypted?
logger.info "Mail not signed/encrypted or not RFC3156 compliant, ignoring..."
msg.delete
next
end

logger.debug "RFC3156 content detected"
begin
order = mail.parse
rescue CyberError => e
case e.severity
when :dangerous
logger.fatal " (#{e.message})"
exit 2
when :unrecoverable
logger.error "Internal processing error, skipping mail (#{e.message})"
next
when :ignorable
end
end
result_tag = order.ok ? "SUCCESS" : "FAILURE"
logger.info "Processing result: #{result_tag} (#{order.message})"
logger.info "Extra processing information: " + order.system_message if order.system_message

if order.user
if order.user.preferredLanguage
logger.debug "User preference for langage: " + order.user.preferredLanguage
set_locale(order.user.preferredLanguage)
else
logger.debug "No user preference for langage, using english"
set_locale("en")
end
else
set_locale("en")
end

unless order.ok
if order.warn_sender
logger.info "Sending reply for rejected message"
mail_reply = mail.create_simple_reject_reply("A message (ID: #{mail.message_id}), apparently from you," +
" was rejected for the following reason:\n #{_(order.message)}")
mail_reply.deliver
end
msg.delete
next
end

logger.debug "Message accepted, processing orders..."
result_list = CommandParser.run(order)

# create transcript
logger.debug "Preparing reply"
reply_txt = sprintf(_("Hello %s,"), order.user.cn) + "\n\n"
reply_txt += _(order.message) + "\n\n" if order.message
reply_txt += _("Follows the transcript of your commands:") + "\n"
reply_attachments = []
result_list.each do |result|
reply_txt << "> #{result.cmd}\n"
reply_txt << "#{result.message}\n"
reply_attachments += result.refs unless result.refs.nil?
end

# create mail
logger.debug "Preparing mail"
mail_reply = mail.create_reply
if reply_attachments.empty?
transcript_part = mail_reply
else
mail_reply.set_content_type("multipart", "mixed", {'boundary' => TMail.new_boundary})
parts = []

p = CyborgHood::Mail.new
transcript_part = p
mail_reply.parts << p

reply_attachments.each do |attachment|
p = CyborgHood::Mail.new
p.set_content_type("text", "plain", {'charset' => "utf-8"})
p.set_disposition("attachment", {'filename' => attachment.filename})
p.quoted_printable_body = attachment.content
mail_reply.parts << p
end
end
# insert transcript
transcript_part.set_content_type("text", "plain", {'charset' => 'utf-8', 'format' => 'flowed'})
transcript_part.set_disposition("inline")
transcript_part.quoted_printable_body = reply_txt

# send reply
logger.debug "Sending mail"
mail_reply.sign_and_crypt(order.user.keyFingerPrint)
mail_reply.deliver

logger.info "Message processed completely, deleting"
msg.delete
end
end

def ask_to_stop
@stop_asap = true
Thread.critical = true
@current_thread.raise if @waiting
Thread.critical = false
end
end

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class CommandParser
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include GetText
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textdomain(PRODUCT + "_Postman")
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def self.run(order)
result_list = []
order.commands.each do |cmdstr|
logger.info "Executing command: #{cmdstr}"
begin
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result = execute_cmd(order.user, cmdstr, order.references)
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if result.nil?
result = OpenStruct.new
result.cmd = cmdstr
result.ok = false
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result.message = _("Command not recognized.")
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result.refs = nil
end
rescue CyberError => e
result = OpenStruct.new
result.cmd = cmdstr
result.ok = false
result.message = e.message.capitalize + "."
result.refs = nil
rescue
logger.warn "Command crashed: " + $!
result = OpenStruct.new
result.cmd = cmdstr
result.ok = false
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result.message = _("Internal error. Administrator is warned.")
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result.refs = nil
end

tag = result.ok ? "SUCCESS" :"FAILURE"
logger.debug "Command result: [#{tag}] #{result.message}"
result_list << result
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end
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result_list
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end

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private
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def self.execute_cmd(user, cmdstr, refs)
cmdline = Shellwords.shellwords(cmdstr)
subsys = cmdline.shift
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result = OpenStruct.new
result.cmd = cmdstr
result.ok = false
ok = true
case subsys.upcase
when "DNS"
return if cmdline.empty?
case cmdline.shift.upcase
when "INFO"
return unless cmdline.empty?
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list = CyborgHood::DnsDomain.find_by_manager(user)
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txt_list = list.collect{|z| z.cn }.sort.join(", ")
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result.ok = true
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result.message = sprintf(_("You are manager of the following zones: %s."), txt_list)
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when "GET"
return if cmdline.empty?
case cmdline.shift.upcase
when "ZONE"
return if cmdline.empty?
zone = cmdline.shift.downcase

dom = CyborgHood::DnsDomain.new(zone)
unless dom.hosted?
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result.message = ("This zone is not hosted here.")
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return result
end
unless dom.managed_by? user
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result.message = _("You are not allowed to manage this zone.")
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return result
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end
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srv_dns = CyborgHood::Services::DNS.new(zone)
result.ok = true
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result.message = _("Requested zone content attached.")
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zone_ref = {:content => srv_dns.read_zone, :filename => "dnszone_#{zone}.txt"}.to_ostruct
result.refs = [zone_ref]
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end
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when "SET"
return if cmdline.empty?
case cmdline.shift.upcase
when "ZONE"
return if cmdline.empty?
zone = cmdline.shift.downcase
dom = CyborgHood::DnsDomain.new(zone)
unless dom.hosted?
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result.message = _("This zone is not hosted here.")
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return result
end
unless dom.managed_by? user
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result.message = _("You are not allowed to manage this zone.")
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return result
end
srv_dns = CyborgHood::Services::DNS.new(zone)

return if cmdline.empty?
content_ref = cmdline.shift.downcase
return unless content_ref =~ /^@(\d+)$/
part_ref = $1.to_i
unless (1..refs.size).include? part_ref
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result.message = _("Attachment number not found.")
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return result
end
part = refs[part_ref]
unless part.content_type == "text/plain"
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result.message = _("Attachment has wrong content-type.")
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return result
end

f = Tempfile.new(zone)
f.write(part.body)
f.close
logger.debug "Created temporary zone file '#{f.path}'"

srv_dns = CyborgHood::Services::DNS.new(zone)
current_serial = srv_dns.serial
logger.debug "Current serial: #{current_serial}"

dns_result = srv_dns.check_zone_file(f.path)
unless dns_result.ok
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result.message = _("Invalid zone data.")
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f.close!
return result
end
logger.debug "New serial: #{dns_result.serial}"
# allow new serial or missing serial (to allow creating a new zone or replacing a broken zone)
unless current_serial.nil? or dns_result.serial > current_serial
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result.message = _("Zone serial is not superior to current serial.")
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f.close!
return result
end

begin
srv_dns.write_zone_from_file(f.path)
logger.debug "zone changed"
if srv_dns.reload_zone
logger.debug "zone reloaded"
result.ok = true
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result.message = _("Zone updated.")
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else
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logger.warn "zone reload failed, replacing old content"
srv_dns.replace_zone_with_backup
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result.message = _("Internal error. Administrator is warned.")
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end
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rescue
logger.warn "Writing zone file failed"
raise
ensure
f.close!
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end
end
end
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end

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if result.message.nil?
# here fall lost souls
nil
else
result
end
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end
end
end

bot = CyborgHood::Postman.new

trap('INT') do
bot.ask_to_stop
end
trap('TERM') do
bot.ask_to_stop
end

bot.run