user_mapper.py

   1 # Copyright (C) 2009 Canonical Ltd
   2 #
   3 # This program is free software; you can redistribute it and/or modify
   4 # it under the terms of the GNU General Public License as published by
   5 # the Free Software Foundation; either version 2 of the License, or
   6 # (at your option) any later version.
   7 #
   8 # This program is distributed in the hope that it will be useful,
   9 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  10 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11 # GNU General Public License for more details.
  12 #
  13 # You should have received a copy of the GNU General Public License
  14 # along with this program; if not, write to the Free Software
  15 # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  16
  17 from email import Utils
  18
  19
  20 class UserMapper(object):
  21
  22     def __init__(self, lines):
  23         """Create a user-mapper from a list of lines.
  24
  25         Blank lines and comment lines (starting with #) are ignored.
  26         Otherwise lines are of the form:
  27
  28           old-id = new-id
  29
  30         Each id may be in the following forms:
  31
  32           name <email>
  33           name
  34
  35         If old-id has the value '@', then new-id is the domain to use
  36         when generating an email from a user-id.
  37         """
  38         self._parse(lines)
  39
  40     def _parse(self, lines):
  41         self._user_map = {}
  42         self._default_domain = None
  43         for line in lines:
  44             line = line.strip()
  45             if len(line) == 0 or line.startswith('#'):
  46                 continue
  47             old, new = line.split('=', 1)
  48             old = old.strip()
  49             new = new.strip()
  50             if old == '@':
  51                 self._default_domain = new
  52                 continue
  53             # Parse each id into a name and email address
  54             old_name, old_email = self._parse_id(old)
  55             new_name, new_email = self._parse_id(new)
  56             #print "found user map: %s => %s" % ((old_name, old_email), (new_name, new_email))
  57             self._user_map[(old_name, old_email)] = (new_name, new_email)
  58
  59     def _parse_id(self, id):
  60         if id.find('<') == -1:
  61             return id, ""
  62         else:
  63             return Utils.parseaddr(id)
  64
  65     def map_name_and_email(self, name, email):
  66         """Map a name and an email to the preferred name and email.
  67
  68         :param name: the current name
  69         :param email: the current email
  70         :result: the preferred name and email
  71         """
  72         try:
  73             new_name, new_email = self._user_map[(name, email)]
  74         except KeyError:
  75             new_name = name
  76             if self._default_domain and not email:
  77                 new_email = "%s@%s" % (name, self._default_domain)
  78             else:
  79                 new_email = email
  80         return new_name, new_email