Make notification rules queryable

core/lib/parsing.py

@@ -1,12 +1,40 @@
 from datetime import datetime
 
 from django.conf import settings
+from django.core.exceptions import ValidationError
+
+from core.models import NotificationRule
 
 
 class QueryError(Exception):
     pass
 
 
+def parse_rule(user, query_params):
+    """
+    Parse a rule query.
+    """
+    if "rule" in query_params:
+        try:
+            rule_object = NotificationRule.objects.filter(id=query_params["rule"])
+        except ValidationError:
+            message = "Rule is not a valid UUID"
+            message_class = "danger"
+            return {"message": message, "class": message_class}
+        if not rule_object.exists():
+            message = "Rule does not exist"
+            message_class = "danger"
+            return {"message": message, "class": message_class}
+        rule_object = rule_object.first()
+        if not rule_object.user == user:
+            message = "Rule does not belong to you"
+            message_class = "danger"
+            return {"message": message, "class": message_class}
+        return rule_object
+    else:
+        return None
+
+
 def parse_size(query_params, sizes):
     if "size" in query_params:
         size = query_params["size"]