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#!/usr/bin/ruby -Ku

#--
# 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/>.
#++

# to allow in-place run for test
$: << File.join(File.dirname(__FILE__), "..", "lib")

#require 'socket'
require 'tempfile'
require 'shellwords'
require 'cyborghood'
require 'cyborghood/imap'
require 'cyborghood/mail'
require 'cyborghood/mail_order'
require 'cyborghood/objects'
require 'cyborghood/services/dns'

#Socket.gethostname


module CyborgHood
module PostmanHome
include I18nTranslation
bindtextdomain("cyborghood_postman", {:path => Config::L10N_DIR, :charset => "UTF-8"})

# not yet ready to be a real Cyborg
class Postman #< Cyborg
include I18nTranslation

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

ldap_config = @config.ldap
ldap_config.logger = logger
ActiveLdap::Base.setup_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 ask_to_stop
@stop_asap = true
Thread.critical = true
@current_thread.raise if @waiting
Thread.critical = false
end

private

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
report = mail.process
rescue CyberError => e
case e.severity
when :grave
logger.fatal "Fatal processing error, exiting (#{e.message})"
exit 2
when :unrecoverable
logger.error "Internal processing error, skipping mail (#{e.message})"
next
when :processable
logger.error "Untreated processing problem, skipping mail (#{e.message})"
next
when :ignorable
logger.warn "Internal processing warning, continuing (#{e.message})"
end
end
result_tag = report.ok? ? "SUCCESS" : "FAILURE"
result_msg = "Processing result: #{result_tag}"
result_msg += " (#{report.error.untranslated})" unless report.ok?
logger.info result_msg

i18n = I18nController.instance
i18n.set_language_for_user(report.user)

unless report.ok?
if report.warn_sender
logger.info "Sending reply for rejected message"
reply_intro = report.user ? _("Hello %{cn},", :cn =>report.user.cn) : _("Hello,")
mail_reply = mail.create_simple_reject_reply(reply_intro.to_s + "\n\n" +
_("A message (ID: %{id}), apparently from you, was rejected for the following reason:",
:id => mail.message_id).to_s + "\n " + report.error.to_s + "\n" + mail_signature())
mail_reply.deliver
end
msg.delete
next
end

order = MailOrder.parse(report.user, report.message)
result_tag = order.valid? ? "SUCCESS" : "FAILURE"
result_msg = "Processing result: #{result_tag}"
result_msg += " (#{order.error.untranslated})" unless order.valid?
logger.info result_msg

reply_intro = _("Hello %{cn},", :cn => order.user.cn)

unless order.valid?
logger.info "Sending reply for rejected order"
mail_reply = mail.create_simple_reject_reply(reply_intro.to_s + "\n\n" +
_("An order, in a message (ID: %{id}) from you, was rejected for the following reason:",
:id => mail.message_id).to_s + "\n " + order.error.to_s + "\n" + mail_signature())
mail_reply.sign_and_crypt(order.user.keyFingerPrint)
mail_reply.deliver
msg.delete
next
end

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

# create transcript
logger.debug "Preparing reply"
reply_txt = reply_intro.to_s + "\n\n"
reply_txt += _("Follows the transcript of your commands:").to_s + "\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
reply_txt += "\n" + mail_signature()

# 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 mail_signature
s = "\n" +
"-- \n" +
"#{CyborgHood::PRODUCT} v#{CyborgHood::VERSION}\n"
s += _("Contact eMail:").to_s + " \"#{@config.contact.name}\" <#{@config.contact.email}>\n" if @config.contact.email
s += _("Contact URL:").to_s + " #{@config.contact.url}\n" if @config.contact.url
s
end
end

class CommandRunner
include I18nTranslation

def self.run(order)
result_list = []
order.commands.each do |cmd|
result = OpenStruct.new
result.cmd = cmd.cmdline
result.ok = false

if cmd.valid?
logger.info "Executing command: #{cmd.cmdline}"
begin
execute_cmd(order.user, cmd.cmdsplit, order.shared_parameters, result)
rescue CyberError => e
result.message = e.message.capitalize + "."
rescue
logger.error "Command crashed: " + $!
logger.error "Crash trace: " + $!.backtrace.join("\n")
result.message = _("Internal error. Administrator is warned.")
end

tag = result.ok ? "SUCCESS" : "FAILURE"
logger.debug "Command result: [#{tag}] #{result.message.untranslated}"
else
logger.info "Invalid command detected: #{cmd.cmdline}"
cmd.parsing_errors.collect{|err| logger.debug "Invalid command detected - reason: " + err.untranslated }
result.message = cmd.parsing_errors.collect{|err| err.to_s }.join("\n")
end
result_list << result
end
result_list
end

private

def self.execute_cmd(user, cmdline, shared_parameters, result)
subsys = cmdline.shift
case subsys.upcase
when "DNS"
return if cmdline.empty?
case cmdline.shift.upcase
when "INFO"
return unless cmdline.empty?
list = CyborgHood::DnsDomain.find_by_manager(user)
txt_list = list.collect{|z| z.cn }.sort.join(", ")
result.ok = true
result.message = _("You are manager of the following zones: %{zone_list}.", :zone_list => txt_list)
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?
result.message = _("This zone is not hosted here.")
return result
end
unless dom.managed_by? user
result.message = _("You are not allowed to manage this zone.")
return result
end

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

return if cmdline.empty?
content_ref = cmdline.shift
part = shared_parameters[content_ref]
unless part.type == "text/plain"
result.message = _("Attachment has wrong content-type.")
return result
end

f = Tempfile.new(zone)
f.write(part.content)
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
result.message = _("Invalid zone data.")
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
result.message = _("Zone serial is not superior to current serial.")
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
result.message = _("Zone updated.")
else
logger.warn "zone reload failed, replacing old content"
srv_dns.replace_zone_with_backup
result.message = _("Internal error. Administrator is warned.")
end
rescue
logger.warn "Writing zone file failed"
raise
ensure
f.close!
end
end
end
end

if result.message.nil?
# here fall lost souls
result.message = _("Command not recognized.")
end
end
end
end
end

bot = CyborgHood::PostmanHome::Postman.new

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

bot.run
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