general: support apps registering URLs

welco/apps.py

@@ -0,0 +1,34 @@
+# welco - multichannel request processing
+# Copyright (C) 2015  Entr'ouvert
+#
+# This program is free software: you can redistribute it and/or modify it
+# under the terms of the GNU Affero 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 Affero General Public License for more details.
+#
+# You should have received a copy of the GNU Affero General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+from django.apps import apps
+from django.conf.urls import patterns, include, url
+
+def register_urls(urlpatterns):
+    pre_urls = []
+    post_urls = []
+    for app in apps.get_app_configs():
+        if hasattr(app, 'get_before_urls'):
+            urls = app.get_before_urls()
+            if urls:
+                pre_urls.append(url('^', include(urls)))
+        if hasattr(app, 'get_after_urls'):
+            urls = app.get_after_urls()
+            if urls:
+                post_urls.append(url('^', include(urls)))
+    pre_patterns = patterns('', *pre_urls)
+    post_patterns = patterns('', *post_urls)
+    return pre_patterns + urlpatterns + post_patterns

welco/urls.py

@@ -17,6 +17,8 @@
 from django.conf.urls import patterns, url
 from django.conf import settings
 
+from . import apps
+
 urlpatterns = patterns('',
     url(r'^$', 'welco.views.home', name='home'),
 )
@@ -27,3 +29,5 @@ urlpatterns += staticfiles_urlpatterns()
 
 from django.conf.urls.static import static
 urlpatterns += static(settings.MEDIA_URL, document_root=settings.MEDIA_ROOT)
+
+urlpatterns = apps.register_urls(urlpatterns)