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#--
# CyborgHood, a distributed system management software.
# Copyright (c) 2009-2010 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/>.
#++


require 'tempfile'
require 'shellwords'
require 'cyborghood/order'
require 'cyborghood/objects'
require 'cyborghood/services/dns'


module CyborgHood
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 = tm_(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 = 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 = 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 = Services::DNS.new(zone)
zone_content = srv_dns.read_zone

result.ok = true
result.message = _("Requested zone content attached.")
zone_ref = {:content => zone_content, :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 = 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 = Services::DNS.new(zone)

return if cmdline.empty?
content_ref = cmdline.shift
ref, part = Order.dereference_param(shared_parameters, content_ref)
unless part.content_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 = 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
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