templates: add true, false, & null aliases to context (#83795)

src/authentic2/context_processors.py

@@ -101,3 +101,9 @@ def home(request):
             ctx['home_ou'] = service.ou
     ctx['home_url'] = get_home_url(request)
     return ctx
+
+
+def constant_aliases(request):
+    '''Provides aliases for true false & null matching python's values
+    True False & None'''
+    return {'true': True, 'false': False, 'null': None}

src/authentic2/settings.py

@@ -92,6 +92,7 @@ TEMPLATES = [
                 'django.template.context_processors.static',
                 'authentic2.context_processors.a2_processor',
                 'authentic2.context_processors.home',
+                'authentic2.context_processors.constant_aliases',
                 'publik_django_templatetags.wcs.context_processors.cards',
             ],
             'builtins': [

tests/test_context_processors.py

@@ -14,6 +14,8 @@
 # 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 unittest import mock
+
 from . import utils
 
 
@@ -52,3 +54,40 @@ def test_home(app, settings, simple_user, service):
     assert body.attr('data-home-service-name') == new_service.name
     assert body.attr('data-home-ou-slug') == new_service.ou.slug
     assert body.attr('data-home-ou-name') == new_service.ou.name
+
+
+@mock.patch('requests.Session.get')
+def test_constant_aliases(request):
+    from django.template import RequestContext, Template
+
+    context = RequestContext(request)
+    t_true = Template('{% if var == true %}OK{% endif %}')
+    t_false = Template('{% if var == false %}OK{% endif %}')
+    t_null = Template('{% if var == null %}OK{% endif %}')
+    t_is_true = Template('{% if var is true %}OK{% endif %}')
+    t_is_false = Template('{% if var is false %}OK{% endif %}')
+    t_is_null = Template('{% if var is null %}OK{% endif %}')
+
+    context.update({'var': True})
+    assert t_true.render(context) == 'OK'
+    assert t_false.render(context) == ''
+    assert t_null.render(context) == ''
+    assert t_is_true.render(context) == 'OK'
+    assert t_is_false.render(context) == ''
+    assert t_is_null.render(context) == ''
+
+    context.update({'var': False})
+    assert t_true.render(context) == ''
+    assert t_false.render(context) == 'OK'
+    assert t_null.render(context) == ''
+    assert t_is_true.render(context) == ''
+    assert t_is_false.render(context) == 'OK'
+    assert t_is_null.render(context) == ''
+
+    context.update({'var': None})
+    assert t_true.render(context) == ''
+    assert t_false.render(context) == ''
+    assert t_null.render(context) == 'OK'
+    assert t_is_true.render(context) == ''
+    assert t_is_false.render(context) == ''
+    assert t_is_null.render(context) == 'OK'