1 files changed, 90 insertions, 0 deletions
diff --git a/src/ansiblelint/rules/no_jinja_when.py b/src/ansiblelint/rules/no_jinja_when.py
new file mode 100644
index 0000000..807081d
--- /dev/null
+++ b/src/ansiblelint/rules/no_jinja_when.py
@@ -0,0 +1,90 @@
+"""Implementation of no-jinja-when rule."""
+from __future__ import annotations
+
+import sys
+from typing import TYPE_CHECKING, Any
+
+from ansiblelint.constants import LINE_NUMBER_KEY
+from ansiblelint.rules import AnsibleLintRule
+
+if TYPE_CHECKING:
+    from ansiblelint.errors import MatchError
+    from ansiblelint.file_utils import Lintable
+    from ansiblelint.utils import Task
+
+
+class NoFormattingInWhenRule(AnsibleLintRule):
+    """No Jinja2 in when."""
+
+    id = "no-jinja-when"
+    description = (
+        "``when`` is a raw Jinja2 expression, remove redundant {{ }} from variable(s)."
+    )
+    severity = "HIGH"
+    tags = ["deprecations"]
+    version_added = "historic"
+
+    @staticmethod
+    def _is_valid(when: str) -> bool:
+        if isinstance(when, list):
+            for item in when:
+                if (
+                    isinstance(item, str)
+                    and item.find("{{") != -1
+                    and item.find("}}") != -1
+                ):
+                    return False
+            return True
+        if not isinstance(when, str):
+            return True
+        return when.find("{{") == -1 and when.find("}}") == -1
+
+    def matchplay(self, file: Lintable, data: dict[str, Any]) -> list[MatchError]:
+        errors: list[MatchError] = []
+        if isinstance(data, dict):
+            if "roles" not in data or data["roles"] is None:
+                return errors
+            for role in data["roles"]:
+                if (
+                    isinstance(role, dict)
+                    and "when" in role
+                    and not self._is_valid(role["when"])
+                ):
+                    errors.append(
+                        self.create_matcherror(
+                            details=str({"when": role}),
+                            filename=file,
+                            lineno=role[LINE_NUMBER_KEY],
+                        ),
+                    )
+        return errors
+
+    def matchtask(
+        self,
+        task: Task,
+        file: Lintable | None = None,
+    ) -> bool | str:
+        return "when" in task.raw_task and not self._is_valid(task.raw_task["when"])
+
+
+if "pytest" in sys.modules:
+    # Tests for no-jinja-when rule.
+    from ansiblelint.rules import RulesCollection
+    from ansiblelint.runner import Runner
+
+    def test_jinja_file_positive() -> None:
+        """Positive test for no-jinja-when."""
+        collection = RulesCollection()
+        collection.register(NoFormattingInWhenRule())
+        success = "examples/playbooks/rule-no-jinja-when-pass.yml"
+        good_runner = Runner(success, rules=collection)
+        assert [] == good_runner.run()
+
+    def test_jinja_file_negative() -> None:
+        """Negative test for no-jinja-when."""
+        collection = RulesCollection()
+        collection.register(NoFormattingInWhenRule())
+        failure = "examples/playbooks/rule-no-jinja-when-fail.yml"
+        bad_runner = Runner(failure, rules=collection)
+        errs = bad_runner.run()
+        assert len(errs) == 3