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#!/usr/bin/python
# -*- mode: python; coding: utf-8 -*-

# Copyright © 2008 Jeffrey C. Ollie

# 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/>.

import os
import re
import smtplib
import socket

from qpid.util import connect
from qpid.connection import Connection
from qpid.datatypes import Message, RangedSet, uuid4
from qpid.queue import Empty

from lxml import etree

import email.generator
import email.message
import email.header
import email.utils
import email.charset

from cStringIO import StringIO

utf8 = email.charset.Charset('utf-8')
utf8.body_encoding = None
utf8.header_encoding = email.charset.SHORTEST

def get_diff(cvsserver, cvsroot, directory, filename, old_version, new_version):
    diff = u''

    if cvsserver == socket.gethostname():
        diff += u'Index: %s\n' % filename
        diffcmd = '/usr/bin/rcsdiff -kk -u -r%s -r%s "%s,v" 2>&1' % (old_version,
                                                                     new_version,
                                                                     os.path.join(cvsroot,
                                                                                  directory,
                                                                                  filename))
    else:
        diffcmd = '/usr/bin/cvs -f -d ":pserver:anonymous@%s:%s" diff -kk -u -N -r %s -r %s "%s" 2>/dev/null' % (cvsserver,
                                                                                                                 cvsroot,
                                                                                                                 old_version,
                                                                                                                 new_version,
                                                                                                                 os.path.join(directory,
                                                                                                                              filename))

    fp = os.popen(diffcmd)
    diff += fp.read().decode('utf-8', 'replace')
    status = fp.close()
    return diff

package_re = re.compile(r'^(?:rpms|devel)/([^/]+)(?:/([^/]+))?')

def append_package_owner_email(directory, log_message, recipients):
    global package_re

    package_match = package_re.match(directory)

    if package_match and package_match.group(1):
        recipients.add('%s-owner@fedoraproject.org' % package_match.group(1))


directory_based_notifications = [(re.compile(r'^rpms'), [append_package_owner_email,
                                                         'cvsextras@fedoraproject.org']),
                                 (re.compile(r'^devel'), [append_package_owner_email,
                                                          'cvsextras@fedoraproject.org']),
                                 (re.compile(r'^common'), ['cvsextras@fedoraproject.org',
                                                           'jkeating@redhat.com']),
                                 (re.compile(r'^owners'), ['cvsextras@fedoraproject.org',
                                                           'cvsadmin-menbers@fedoraproject.org']),
                                 (re.compile(r'^comps'), ['cvsextras@fedoraproject.org',
                                                          'katzj@redhat.com',
                                                          'notting@redhat.com',
                                                          'jkeating@redhat.com']),
                                 (re.compile(r'^example'), ['jeff@ocjtech.us'])]

message_based_notifications = [(re.compile(r'docs'), ['relnotes@fedoraproject.org'])]

def process_notifications(directory, log_message, recipients, notifications):
    for notification in notifications:
        if isinstance(notification, basestring):
            recipients.add(notification)
        elif callable(notification):
            notification(directory, log_message, recipients)

def compute_directory_based_notifications(directory, log_message, recipients):
     for pattern, notifications in directory_based_notifications:
         match = pattern.match(directory)
         if match:
             process_notifications(directory, log_message, recipients, notifications)


def compute_message_based_notifications(directory, log_message, email_recipient_set):
     for pattern, notifications in message_based_notifications:
         match = pattern.search(log_message)
         if match:
             process_notifications(directory, log_message, recipients, notifications)
                
host = '127.0.0.1'
port = 5672

sock = connect(host, port)
connection = Connection(sock = sock)
connection.start()
session = connection.session(str(uuid4()))

local_queue_name = 'local_queue'
local_queue = session.incoming(local_queue_name)

session.message_subscribe(queue = 'loginfo_queue', destination = local_queue_name)
local_queue.start()

message = None
while True:
    try:
	message = local_queue.get(timeout=10)

	root_element = etree.fromstring(message.body)

	cvsserver = root_element.xpath('/loginfo/cvsserver')[0].text
	cvsroot = root_element.xpath('/loginfo/cvsroot')[0].text
	directory = root_element.xpath('/loginfo/directory')[0].text
        username = root_element.xpath('/loginfo/username')[0].text
        fullname = root_element.xpath('/loginfo/fullname')[0].text
        timestamp = float(root_element.xpath('/loginfo/timestamp')[0].text)
        log_message = root_element.xpath('/loginfo/message')[0].text

        email_sender = email.utils.formataddr((fullname, username + '@fedoraproject.org'))

        email_body = u'Author: %s\n\n' % email_sender
        email_body += unicode(log_message)
        email_body += u'\n\n'

        email_subject = unicode(directory)
                                        
	for file_element in root_element.xpath('/loginfo/files/file'):
	    filename = file_element.xpath('filename')[0].text
	    old_version = file_element.xpath('old-version')[0].text
	    new_version = file_element.xpath('new-version')[0].text

	    diff = get_diff(cvsserver, cvsroot, directory, filename, old_version, new_version)
	    diff_element = etree.SubElement(file_element, u'diff')
	    diff_element.text = diff

            email_body += diff
            email_body += u'\n\n'

            email_subject += u' %s,%s,%s' % (filename, old_version, new_version)

        # build the list of recipients

        recipients = set()
        compute_directory_based_notifications(directory, log_message, recipients)
        compute_message_based_notifications(directory, log_message, recipients)
        
        if len(recipients) == 0:
            recipients.add('admin@fedoraproject.org')

        email_recipients = list(recipients)
        email_recipients.sort()

        # Build the email object

        msg = email.message.Message()
        msg.set_charset(utf8)
        msg.set_payload(email_body.encode('utf-8'))

        msg['From'] = email.header.Header(unicode(email_sender), utf8)
        msg['To'] = email.header.Header(u', '.join(email_recipients), utf8)
        msg['Subject'] = email.header.Header(email_subject, utf8)
        msg['Date'] = email.utils.formatdate(timestamp)
        msg['X-CVSROOT'] = cvsroot
        msg['X-CVS-Module'] = directory.split('/', 1)[0]
        msg['X-CVS-Directory'] = directory
        msg['X-CVS-User'] = username
        msg['X-CVS-Server'] = cvsserver
        msg['Precedence'] = 'first-class'

        # and send it out

        msg_fp = StringIO()
        msg_g = email.generator.Generator(msg_fp, False)
        msg_g.flatten(msg)

        s = smtplib.SMTP()
        s.connect()
        s.sendmail(email_sender, email_recipients, msg_fp.getvalue())
        s.close()

	session.message_accept(RangedSet(message.id))

    except Empty:
	print 'No more messages!'
	break

session.close(timeout=10)