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require 'cyborghood/base'
require 'delegate'
require 'tmail'
require 'tmail_extra'
require 'gpgme'

# This class handles RFC3156 signed messages, validates them, and extract orders properly.
# Encrypted content are not implemented yet.
module CyborgHood
class Mail < Delegator
def initialize(msg)
# unquote headers and transform into TMail object
@mail = TMail::Mail.parse(TMail::Unquoter.unquote_and_convert_to(msg, "UTF-8"))
end

def __getobj__
@mail
end

def parse
sig_check = verify_pgp_signature()
if sig_check.status == 0
logger.info "Mail content was properly signed by key #{sig_check.fingerprint}"
user = Person.find_by_fingerprint(sig_check.fingerprint)
if user.nil?
logger.info "Mail is from an unknown person"
else
logger.info "Mail is from user #{user.uid} (#{user.cn})"

signed_content = pgp_signed_part()
if signed_content.multipart?
if signed_content.parts[0].content_type == "text/plain"
command_txt = signed_content.parts[0].body
refs = signed_content.parts.collect{|p| p.dup }
end
else
command_txt = signed_content.body if signed_content.content_type == "text/plain"
refs = []
end

if command_txt
commands = []
command_txt.each_line do |line|
line.chomp!
sline = line.strip
# skip empty lines and comments
next if sline == "" or sline[0, 1] == "#"
# stop processing when detecting message signature
break if line == "-- "

commands << sline
end

return {:user => user, :commands => commands, :refs => refs}.to_ostruct
else
logger.info "Mail does not contain a proper MIME part for commands"
end
end
else
logger.info "Mail content tampered or badly signed: " + sig_check.to_s
end

nil
end
end
end
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