redmine/sub-mailhandler.py

   1 #!/usr/bin/env python
   2 #
   3 # sub-mailhandler.py - frontend for rdm-mailhandler.rb
   4 # v.1.0.1
   5 #
   6 # This script parses the header of a message until it finds a known email;
   7 # then use that email to look for a subaddress pattern that provides a
   8 # project to rdm-mailhandler.rb
   9 #
  10 # It works by using an email of the form:
  11 # <user+project@example.com>
  12 # Most mail servers will deliver this to <user@example.com>, so the + part
  13 # is used to determine the project. A default ptoject can be specified.
  14 #
  15 #
  16 # Copyright 2010 Thomas Guyot-Sionnest <tguyot@gmail.com>
  17 #
  18 # This program is free software: you can redistribute it and/or modify
  19 # it under the terms of the GNU General Public License as published by
  20 # the Free Software Foundation, either version 3 of the License, or
  21 # (at your option) any later version.
  22 #
  23 # This program is distributed in the hope that it will be useful,
  24 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  25 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  26 # GNU General Public License for more details.
  27 #
  28 # You should have received a copy of the GNU General Public License
  29 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
  30 #
  31
  32 import sys
  33 import email
  34 from optparse import OptionParser
  35 from subprocess import Popen, PIPE
  36
  37 oparser = OptionParser(usage='%prog -h | -e <email> [ -p <project> ] -- <command-line>',
  38                       description='''The <command-line> portion is the full
  39 rdm-mailhandler.rb command that would normally be executed as the mail
  40 handler. The full path to the executable is required. This command should not
  41 include a project; use the build-in --project argument instead.''')
  42
  43 oparser.add_option('-e', '--email', type='string', dest='email',
  44                   help='Known email to look for (i.e. redmine recipient)')
  45 oparser.add_option('-p', '--project', type='string', dest='project',
  46                   help='Default project to pass to rdm-mailhandler.rb if there is no subaddress')
  47
  48 (options, args) = oparser.parse_args()
  49
  50 # Get email split and make sute it's not having weird formatting already
  51 if options.email is None: oparser.error('You must provide an email address')
  52
  53 try:
  54     esplit = options.email.index('@')
  55 except ValueError:
  56     oparser.error('Not an email address')
  57
  58 # Split out email to use the individual parts here and later:
  59 ename = options.email[:esplit]
  60 edomain = options.email[esplit+1:]
  61 try:
  62     ename.index('+')
  63     oparser.error('Email provided contains a subaddress already')
  64 except ValueError:
  65     pass
  66 try:
  67     edomain.index('@')
  68     oparser.error('Duplicate @ in email address')
  69 except ValueError:
  70     pass
  71
  72 # Read-in the headers...
  73 buf = ''
  74 while True:
  75     line = sys.stdin.readline()
  76     buf += line
  77     if line.strip() == '': break
  78
  79 # parse them...
  80 eo = email.parser.HeaderParser()
  81 msg = eo.parsestr(buf, headersonly=True)
  82
  83 # Fetch all email addresses out of them...
  84 tos = msg.get_all('to', [])
  85 ccs = msg.get_all('cc', [])
  86 resent_tos = msg.get_all('resent-to', [])
  87 resent_ccs = msg.get_all('resent-cc', [])
  88 all_recipients = email.utils.getaddresses(tos + ccs + resent_tos + resent_ccs)
  89
  90 # And look for a matching one
  91 project = None
  92 for n, e in all_recipients:
  93     split = e.index('@')
  94     email = e[:split]
  95     domain = e[split+1:]
  96     subaddr = None
  97
  98     # If we have a subaddress, get it.
  99     try:
 100         ssplit = email.rindex('+')
 101         subaddr = email[ssplit+1:]
 102         email = email[:ssplit]
 103     except ValueError:
 104         pass
 105
 106     # Now check email and subaddress, then break if found
 107     if email == ename and domain == edomain:
 108         if subaddr:
 109             project = subaddr
 110             break
 111
 112 # Finally, execute the handler and pass it the whole thing
 113 if project:
 114     projectarg = ['-p', project]
 115 elif options.project:
 116     projectarg = ['-p', options.project]
 117 else:
 118     projectarg = []
 119
 120 handler = Popen(args + projectarg, stdin=PIPE, stdout=sys.stdout, stderr=sys.stderr, shell=False)
 121 handler.stdin.write(buf)
 122 for l in sys.stdin:
 123     handler.stdin.write(l)
 124
 125 handler.stdin.close()
 126 handler.wait()
 127 sys.exit(handler.returncode)
 128