mediagoblin/listings/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 from mediagoblin.db.util import DESCENDING
  18
  19 from mediagoblin.tools.pagination import Pagination
  20 from mediagoblin.tools.response import render_to_response
  21 from mediagoblin.decorators import uses_pagination
  22
  23 from werkzeug.contrib.atom import AtomFeed
  24
  25
  26 def _get_tag_name_from_entries(media_entries, tag_slug):
  27     """
  28     Get a tag name from the first entry by looking it up via its slug.
  29     """
  30     # ... this is slightly hacky looking :\
  31     tag_name = tag_slug
  32     if media_entries.count():
  33         for tag in media_entries[0]['tags']:
  34             if tag['slug'] == tag_slug:
  35                 tag_name == tag['name']
  36                 break
  37
  38     return tag_name
  39
  40
  41 @uses_pagination
  42 def tag_listing(request, page):
  43     """'Gallery'/listing for this tag slug"""
  44     tag_slug = request.matchdict[u'tag']
  45
  46     cursor = request.db.MediaEntry.find(
  47         {u'state': u'processed',
  48          u'tags.slug': tag_slug})
  49     cursor = cursor.sort('created', DESCENDING)
  50
  51     pagination = Pagination(page, cursor)
  52     media_entries = pagination()
  53
  54     tag_name = _get_tag_name_from_entries(media_entries, tag_slug)
  55
  56     return render_to_response(
  57         request,
  58         'mediagoblin/listings/tag.html',
  59         {'tag_slug': tag_slug,
  60          'tag_name': tag_name,
  61          'media_entries': media_entries,
  62          'pagination': pagination})
  63
  64
  65 ATOM_DEFAULT_NR_OF_UPDATED_ITEMS = 15
  66
  67
  68 def tag_atom_feed(request):
  69     """
  70     generates the atom feed with the tag images
  71     """
  72     tag_slug = request.matchdict[u'tag']
  73
  74     cursor = request.db.MediaEntry.find(
  75         {u'state': u'processed',
  76          u'tags.slug': tag_slug})
  77     cursor = cursor.sort('created', DESCENDING)
  78     cursor = cursor.limit(ATOM_DEFAULT_NR_OF_UPDATED_ITEMS)
  79
  80     """
  81     ATOM feed id is a tag URI (see http://en.wikipedia.org/wiki/Tag_URI)
  82     """
  83     feed = AtomFeed(
  84         "MediaGoblin: Feed for tag '%s'" % tag_slug,
  85         feed_url=request.url,
  86         id='tag:'+request.host+',2011:gallery.tag-%s' % tag_slug,
  87         links=[{'href': request.urlgen(
  88                  'mediagoblin.listings.tags_listing',
  89                  qualified=True, tag=tag_slug ),
  90             'rel': 'alternate',
  91             'type': 'text/html'}])
  92     for entry in cursor:
  93         feed.add(entry.get('title'),
  94             entry.get('description_html'),
  95             id=entry.url_for_self(request.urlgen,qualified=True),
  96             content_type='html',
  97             author={'name': entry.get_uploader.username,
  98                 'uri': request.urlgen(
  99                     'mediagoblin.user_pages.user_home',
 100                     qualified=True, user=entry.get_uploader.username)},
 101             updated=entry.get('created'),
 102             links=[{
 103                 'href':entry.url_for_self(
 104                    request.urlgen,
 105                    qualified=True),
 106                 'rel': 'alternate',
 107                 'type': 'text/html'}])
 108
 109     return feed.get_response()