#!/usr/bin/env python
# -*- coding: utf-8 -*-
"""News to mail gateway script. Copyright 2000 Cosimo Alfarano

Author: Cosimo Alfarano
Date: June 11 2000

pygs - Copyright 2000 by Cosimo Alfarano <Alfarano@Students.CS.UniBo.It>
You can use this software under the terms of the GPL. If we meet some day,
and you think this stuff is worth it, you can buy me a beer in return.

Thanks to md for this useful formula. Beer is beer.

Gets news article from stdin and sends it via SMTP.
"""
from __future__ import print_function

import argparse
from mail2news import VERSION, DESC
import news2mail
import os
import sys
import whitelist


def parse_cmdline():
    """
    set a dictionary with smtp new header in gw parameter (gw.smtpheads)
    return (test,verbose) boolean tuple
    """
    parser = argparse.ArgumentParser(
        description='pyg version %s - Copyright 2000 Cosimo Alfarano\n%s' %
        (VERSION, DESC))

    parser.add_argument('-H', '--smtpserver', default='')
    parser.add_argument('-s', '--sender', required=True, default='')
    parser.add_argument('-e', '--envelope', default='')
    parser.add_argument('-t', '--to', dest='rcpt', required=True)
    parser.add_argument('-w', '--wlfile')
    parser.add_argument('-l', '--logfile')

    parser.add_argument('-T', '--test',
                        help='test mode (not send article via SMTP)',
                        action='store_true')
    parser.add_argument('-v', '--verbose', help='verbose output',
                        action='store_true')

    opts = parser.parse_args()

#  By rfc822 [Resent-]Sender: should be ever set, unless == From:
# (not this case). Should be a human, while [Resent-]From: may be a program.

    if opts.rcpt == '' or opts.sender == '':
        raise argparse.ArgumentError('missing command line option')

    if opts.envelope == '' and opts.sender != '':
        opts.envelope = opts.sender

    return opts


"""main is structured in 4 phases:
    1) check and set pyg's internal variables
    2) check whitelist for users' permission
    3) format rfc 822 headers from input article
    4) open smtp connection and send e-mail
"""

"""phase 1:
check and set pyg's internal variables
"""

# it returns only test, other parms are set directly in the actual
# parameter
args = parse_cmdline()

n2m = news2mail.news2mail(verbose=args.verbose)
owner = None

# check if n2m has some file prefercences set on commandline
if args.wlfile is None:
    wl = os.path.expanduser(os.path.join(os.path.dirname(__file__), 'pyg.whitelist'))
else:
    wl = args.wlfile

if args.logfile is None:
    log = os.path.expanduser(os.path.join(os.path.dirname(__file__), 'pyg.log'))
else:
    log = args.logfile

wl = whitelist.whitelist(wl, log)

"""phase 2:
check whitelist for user's permission
"""

# make a first check of From: address
owner = wl.checkfrom(n2m.message['From'])
if owner is None:
    if sys.stdin.isatty() == 1 or args.test:
        print ('"%s" is not in whitelist!' % (n2m.message['From'][:-1]))
    else:
        wl.logmsg(n2m.nntpheads, wl.DENY)

    # if verbose, I want to print out headers, so I can't
    # exit now.
    if not args.verbose:
        sys.exit(1)

# Reformat the message
n2m.process_message()

# prints formatted email message only (without send) if user wants
if args.verbose:
    print(n2m.message.as_string())

if owner is None:
    sys.exit(1)

"""phase 4:
open smtp connection and send e-mail
"""

wl.logmsg(n2m.heads_dict, wl.ACCEPT, owner)
if not args.test:
    n2m.sendarticle()