Improved group/role thing. Improved email sending (prepare for

OneClickAction).

dav_events/utils.py

@@ -1,6 +1,8 @@
 import logging
+from django.apps import apps
 from django.contrib.auth.models import Group
 
+app_config = apps.get_containing_app_config(__package__)
 logger = logging.getLogger(__name__)
 
 
@@ -12,5 +14,24 @@ def get_group_members(group_name, ignore_missing=False):
     except Group.DoesNotExist:
         if not ignore_missing:
             raise
-
     return users
+
+
+def get_group_name_by_role(role):
+    group_name_var = 'group_{}'.format(role)
+    return getattr(app_config.settings, group_name_var, None)
+
+
+def get_users_by_role(role):
+    users = []
+    group_name = get_group_name_by_role(role)
+    if group_name:
+        users = get_group_members(group_name, ignore_missing=True)
+    return users
+
+
+def has_role(user, role):
+    group_name = get_group_name_by_role(role)
+    if group_name and user.groups.filter(name=group_name).count():
+        return True
+    return False