mediagoblin/webfinger/views.py

   1 # GNU MediaGoblin -- federated, autonomous media hosting
   2 # Copyright (C) 2011, 2012 MediaGoblin contributors.  See AUTHORS.
   3 #
   4 # This program is free software: you can redistribute it and/or modify
   5 # it under the terms of the GNU Affero General Public License as published by
   6 # the Free Software Foundation, either version 3 of the License, or
   7 # (at your option) any later version.
   8 #
   9 # This program is distributed in the hope that it will be useful,
  10 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 # GNU Affero General Public License for more details.
  13 #
  14 # You should have received a copy of the GNU Affero General Public License
  15 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
  16 '''
  17 For references, see docstring in mediagoblin/webfinger/__init__.py
  18 '''
  19
  20 import re
  21
  22 from urlparse import urlparse
  23
  24 from mediagoblin.tools.response import render_to_response, render_404
  25
  26 def host_meta(request):
  27     '''
  28     Webfinger host-meta
  29     '''
  30
  31     placeholder = 'MG_LRDD_PLACEHOLDER'
  32
  33     lrdd_title = 'GNU MediaGoblin - User lookup'
  34
  35     lrdd_template = request.urlgen(
  36         'mediagoblin.webfinger.xrd',
  37         uri=placeholder,
  38         qualified=True)
  39
  40     return render_to_response(
  41         request,
  42         'mediagoblin/webfinger/host-meta.xml',
  43         {'request': request,
  44          'lrdd_template': lrdd_template,
  45          'lrdd_title': lrdd_title,
  46          'placeholder': placeholder})
  47
  48 MATCH_SCHEME_PATTERN = re.compile(r'^acct:')
  49
  50 def xrd(request):
  51     '''
  52     Find user data based on a webfinger URI
  53     '''
  54     param_uri = request.GET.get('uri')
  55
  56     if not param_uri:
  57         return render_404(request)
  58
  59     '''
  60     :py:module:`urlparse` does not recognize usernames in URIs of the
  61     form ``acct:user@example.org`` or ``user@example.org``.
  62     '''
  63     if not MATCH_SCHEME_PATTERN.search(param_uri):
  64         # Assume the URI is in the form ``user@example.org``
  65         uri = 'acct://' + param_uri
  66     else:
  67         # Assumes the URI looks like ``acct:user@example.org
  68         uri = MATCH_SCHEME_PATTERN.sub(
  69             'acct://', param_uri)
  70
  71     parsed = urlparse(uri)
  72
  73     xrd_subject = param_uri
  74
  75     # TODO: Verify that the user exists
  76     # Q: Does webfinger support error handling in this case?
  77     #    Returning 404 seems intuitive, need to check.
  78     if parsed.username:
  79         # The user object
  80         # TODO: Fetch from database instead of using the MockUser
  81         user = MockUser()
  82         user.username = parsed.username
  83
  84         xrd_links = [
  85             {'attrs': {
  86                     'rel': 'http://microformats.org/profile/hcard',
  87                     'href': request.urlgen(
  88                         'mediagoblin.user_pages.user_home',
  89                         user=user.username,
  90                         qualified=True)}},
  91             {'attrs': {
  92                     'rel': 'http://schemas.google.com/g/2010#updates-from',
  93                     'href': request.urlgen(
  94                         'mediagoblin.user_pages.atom_feed',
  95                         user=user.username,
  96                         qualified=True)}}]
  97
  98         xrd_alias = request.urlgen(
  99             'mediagoblin.user_pages.user_home',
 100             user=user.username,
 101             qualified=True)
 102
 103         return render_to_response(
 104             request,
 105             'mediagoblin/webfinger/xrd.xml',
 106             {'request': request,
 107              'subject': xrd_subject,
 108              'alias': xrd_alias,
 109              'links': xrd_links })
 110     else:
 111         return render_404(request)
 112
 113 class MockUser(object):
 114     '''
 115     TEMPORARY user object
 116     '''
 117     username = None