#!/usr/bin/env python2

# -*- coding: utf-8 -*-

# Milter calls methods of your class at milter events.

# Return REJECT,TEMPFAIL,ACCEPT to short circuit processing for a message.

# You can also add/del recipients, replacebody, add/del headers, etc.

import base64

import email

import os

import StringIO

import sys

import time

from socket import AF_INET, AF_INET6

import Milter

if True:

    from multiprocessing import Process as Thread, Queue

else:

    from threading import Thread

    from Queue import Queue

from Milter.utils import parse_addr

from sqlalchemy.exc import SQLAlchemyError

logq = Queue(maxsize=4)

if 'PAGURE_CONFIG' not in os.environ \

        and os.path.exists('/etc/pagure/pagure.cfg'):

    print 'Using configuration file `/etc/pagure/pagure.cfg`'

    os.environ['PAGURE_CONFIG'] = '/etc/pagure/pagure.cfg'

sys.path.insert(0, os.path.expanduser('/srv/progit'))

import pagure

import pagure.exceptions

import pagure.lib

def get_email_body(emailobj):

    ''' Return the body of the email, preferably in text.

    '''

    body = None

    if emailobj.is_multipart():

        for payload in emailobj.get_payload():

            body = payload.get_payload()

            if payload.get_content_type() == 'text/plain':

                break

    else:

        body = emailobj.get_payload()

    enc = emailobj['Content-Transfer-Encoding']

    if enc == 'base64':

        body = base64.decodestring(body)

    return body

class PagureMilter(Milter.Base):

    def __init__(self):  # A new instance with each new connection.

        self.id = Milter.uniqueID()  # Integer incremented with each call.

        self.fp = None

    def envfrom(self, mailfrom, *str):

        self.log("mail from:", mailfrom, *str)

        self.fromparms = Milter.dictfromlist(str)

        # NOTE: self.fp is only an *internal* copy of message data.  You

        # must use addheader, chgheader, replacebody to change the message

        # on the MTA.

        self.fp = StringIO.StringIO()

        self.canon_from = '@'.join(parse_addr(mailfrom))

        self.fp.write('From %s %s\n' % (self.canon_from, time.ctime()))

        return Milter.CONTINUE

    @Milter.noreply

    def connect(self, IPname, family, hostaddr):

        self.log("connected")

        return Milter.CONTINUE

    @Milter.noreply

    def header(self, name, hval):

        self.fp.write("%s: %s\n" % (name, hval))     # add header to buffer

        return Milter.CONTINUE

    @Milter.noreply

    def eoh(self):

        self.fp.write("\n")                         # terminate headers

        return Milter.CONTINUE

    @Milter.noreply

    def body(self, chunk):

        self.fp.write(chunk)

        return Milter.CONTINUE

    ##  def envrcpt(self, to, *str):

    @Milter.noreply

    def envrcpt(self, to, *str):

        rcptinfo = to, Milter.dictfromlist(str)

        print rcptinfo

        return Milter.CONTINUE

    def eom(self):

        self.fp.seek(0)

        msg = email.message_from_file(self.fp)

        msg_id = msg['In-Reply-To']

        self.log('msg-ig', msg_id)

        self.log('To', msg['to'])

        self.log('From', msg['From'])

        for key in ['<', '>']:

            if key in msg_id:

                msg_id = msg_id.replace(key, '')

        if msg_id and '-ticket-' in msg_id:

            return self.handle_ticket_email(msg, msg_id)

        elif msg_id and '-pull-request-' in msg_id:

            return self.handle_request_email(msg, msg_id)

        else:

            self.log('Not a pagure ticket or pull-request email, let it go')

            return Milter.CONTINUE

    def log(self,*msg):

        logq.put((msg, self.id,time.time()))

    def handle_ticket_email(self, emailobj, msg_id):

        ''' Add the email as a comment on a ticket. '''

        uid  = msg_id.split('-ticket-')[-1].split('@')[0]

        parent_id = None

        if '-' in uid:

            uid, parent_id = uid.rsplit('-', 1)

        if '/' in uid:

            uid = uid.split('/')[0]

        self.log('uid', uid)

        self.log('parent_id', parent_id)

        issue = pagure.lib.get_issue_by_uid(

            pagure.SESSION,

            issue_uid = uid

        )

        if not issue:

            self.log('No related ticket found, let it go')

            return Milter.CONTINUE

        try:

            message = pagure.lib.add_issue_comment(

                pagure.SESSION,

                issue=issue,

                comment=get_email_body(emailobj),

                user=emailobj['From'],

                ticketfolder=pagure.APP.config['TICKETS_FOLDER'],

            )

            pagure.SESSION.commit()

        except pagure.exceptions.PagureException, err:

            self.log(str(err))

        except SQLAlchemyError, err:  # pragma: no cover

            pagure.SESSION.rollback()

            self.log(str(err))

        return Milter.ACCEPT

    def handle_request_email(self, emailobj, msg_id):

        ''' Add the email as a comment on a request. '''

        msg_id = msg['In-Reply-To']

        uid  = msg_id.split('-pull-request-')[-1].split('@')[0]

        parent_id = None

        if '-' in uid:

            uid, parent_id = uid.rsplit('-', 1)

        if '/' in uid:

            uid = uid.split('/')[0]

        self.log('uid', uid)

        self.log('parent_id', parent_id)

        request = pagure.lib.get_request_by_uid(

            pagure.SESSION,

            request_uid = uid

        )

        if not request:

            self.log('No related pull-request found, let it go')

            return Milter.CONTINUE

        try:

            message = pagure.lib.add_pull_request_comment(

                pagure.SESSION,

                request=request,

                comment=get_email_body(emailobj),

                user=emailobj['From'],

                requestfolder=pagure.APP.config['REQUESTS_FOLDER'],

            )

            pagure.SESSION.commit()

        except pagure.exceptions.PagureException, err:

            self.log(str(err))

        except SQLAlchemyError, err:  # pragma: no cover

            pagure.SESSION.rollback()

            self.log(str(err))

        return Milter.ACCEPT

def background():

    while True:

        t = logq.get()

        if not t: break

        msg,id,ts = t

        print "%s [%d]" % (time.strftime('%Y%b%d %H:%M:%S',time.localtime(ts)),id),

        # 2005Oct13 02:34:11 [1] msg1 msg2 msg3 ...

        for i in msg: print i,

        print

## ===

def main():

    bt = Thread(target=background)

    bt.start()

    socketname = "/var/run/pagure/paguresock"

    timeout = 600

    # Register to have the Milter factory create instances of your class:

    Milter.factory = PagureMilter

    print "%s pagure milter startup" % time.strftime('%Y%b%d %H:%M:%S')

    sys.stdout.flush()

    Milter.runmilter("paguremilter", socketname, timeout)

    logq.put(None)

    bt.join()

    print "%s pagure milter shutdown" % time.strftime('%Y%b%d %H:%M:%S')

if __name__ == "__main__":

    main()