fix(feature_flags): handle expected falsy values in conditions (#2052)

Co-authored-by: Ran Isenberg <ran.isenberg@ranthebuilder.cloud>
Co-authored-by: Heitor Lessa <lessa@amazon.co.uk>
Co-authored-by:  Ajwad Shaikh @ajwad-shaikh

Author: 3 people

aws_lambda_powertools/utilities/feature_flags/feature_flags.py

@@ -47,8 +47,6 @@ def __init__(self, store: StoreProvider, logger: Optional[Union[logging.Logger,
         self.logger = logger or logging.getLogger(__name__)
 
     def _match_by_action(self, action: str, condition_value: Any, context_value: Any) -> bool:
-        if not context_value:
-            return False
         mapping_by_action = {
             schema.RuleAction.EQUALS.value: lambda a, b: a == b,
             schema.RuleAction.NOT_EQUALS.value: lambda a, b: a != b,

aws_lambda_powertools/utilities/feature_flags/schema.py

@@ -325,9 +325,9 @@ def validate_condition_key(condition: Dict[str, Any], rule_name: str):
 
     @staticmethod
     def validate_condition_value(condition: Dict[str, Any], rule_name: str):
-        value = condition.get(CONDITION_VALUE, "")
-        if not value:
-            raise SchemaValidationError(f"'value' key must not be empty, rule={rule_name}")
+        value = condition.get(CONDITION_VALUE)
+        if value is None:
+            raise SchemaValidationError(f"'value' key must not be null, rule={rule_name}")
         action = condition.get(CONDITION_ACTION, "")
 
         # time actions need to be parsed to make sure date and time format is valid and timezone is recognized

tests/functional/feature_flags/test_schema_validation.py

@@ -301,10 +301,47 @@ def test_validate_condition_missing_condition_value():
     }
 
     # WHEN calling validate_condition
-    with pytest.raises(SchemaValidationError, match="'value' key must not be empty"):
+    with pytest.raises(SchemaValidationError, match="'value' key must not be null"):
         ConditionsValidator.validate_condition_value(condition=condition, rule_name="dummy")
 
 
+def test_validate_condition_none_condition_value():
+    # GIVEN a configuration with a missing condition value
+    condition = {
+        "action": RuleAction.EQUALS.value,
+        "key": "tenant_id",
+        "value": None,
+    }
+
+    # WHEN calling validate_condition
+    with pytest.raises(SchemaValidationError, match="'value' key must not be null"):
+        ConditionsValidator.validate_condition_value(condition=condition, rule_name="dummy")
+
+
+def test_validate_condition_empty_condition_value():
+    # GIVEN a configuration with a missing condition value
+    condition = {
+        "action": RuleAction.EQUALS.value,
+        "key": "tenant_id",
+        "value": "",
+    }
+
+    # WHEN calling validate_condition
+    ConditionsValidator.validate_condition_value(condition=condition, rule_name="dummy")
+
+
+def test_validate_condition_valid_falsy_condition_value():
+    # GIVEN a configuration with a missing condition value
+    condition = {
+        "action": RuleAction.EQUALS.value,
+        "key": "tenant_id",
+        "value": 0,
+    }
+
+    # WHEN calling validate_condition
+    ConditionsValidator.validate_condition_value(condition=condition, rule_name="dummy")
+
+
 def test_validate_rule_invalid_rule_type():
     # GIVEN an invalid rule type of empty list
     # WHEN calling validate_rule