#!/usr/bin/env python

"""dummy SMTP server for use in tests"""

from __future__ import absolute_import

import asyncore

import optparse

import smtpd

import ssl

import sys

from mercurial import (

    cmdutil,

)

def log(msg):

    sys.stdout.write(msg)

    sys.stdout.flush()

class dummysmtpserver(smtpd.SMTPServer):

    def __init__(self, localaddr):

        smtpd.SMTPServer.__init__(self, localaddr, remoteaddr=None)

    def process_message(self, peer, mailfrom, rcpttos, data):

        log('%s from=%s to=%s\n' % (peer[0], mailfrom, ', '.join(rcpttos)))

class dummysmtpsecureserver(dummysmtpserver):

    def __init__(self, localaddr, certfile):

        dummysmtpserver.__init__(self, localaddr)

        self._certfile = certfile

    def handle_accept(self):

        pair = self.accept()

        if not pair:

            return

        conn, addr = pair

        try:

            # wrap_socket() would block, but we don't care

            conn = ssl.wrap_socket(conn, server_side=True,

                                   certfile=self._certfile,

                                   ssl_version=ssl.PROTOCOL_TLSv1)

        except ssl.SSLError:

            log('%s ssl error\n' % addr[0])

            conn.close()

            return

        smtpd.SMTPChannel(self, conn, addr)

def run():

    try:

        asyncore.loop()

    except KeyboardInterrupt:

        pass

def main():

    op = optparse.OptionParser()

    op.add_option('-d', '--daemon', action='store_true')

    op.add_option('--daemon-postexec', action='append')

    op.add_option('-p', '--port', type=int, default=8025)

    op.add_option('-a', '--address', default='localhost')

    op.add_option('--pid-file', metavar='FILE')

    op.add_option('--tls', choices=['none', 'smtps'], default='none')

    op.add_option('--certificate', metavar='FILE')

    opts, args = op.parse_args()

    if opts.tls == 'smtps' and not opts.certificate:

        op.error('--certificate must be specified')

    addr = (opts.address, opts.port)

    def init():

        if opts.tls == 'none':

            dummysmtpserver(addr)

        else:

            dummysmtpsecureserver(addr, opts.certificate)

        log('listening at %s:%d\n' % addr)

    cmdutil.service(vars(opts), initfn=init, runfn=run,

                    runargs=[sys.executable, __file__] + sys.argv[1:])

if __name__ == '__main__':

    main()