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Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
SPDX-License-Identifier: MIT-0
"""
from __future__ import annotations
from typing import Any
from cfnlint.jsonschema import ValidationResult, Validator
from cfnlint.rules.functions._BaseFn import BaseFn
class Equals(BaseFn):
"""Check Equals Condition Function Logic"""
id = "E8003"
shortdesc = "Check Fn::Equals structure for validity"
description = "Check Fn::Equals is a list of two elements"
source_url = "https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/intrinsic-function-reference-conditions.html#intrinsic-function-reference-conditions-equals"
tags = ["functions", "equals"]
def __init__(self) -> None:
super().__init__("Fn::Equals", ("boolean",))
self.child_rules = {
"W8003": None,
}
def fn_equals(
self, validator: Validator, s: Any, instance: Any, schema: Any
) -> ValidationResult:
errs = list(self.validate(validator, s, instance, schema))
if errs:
yield from iter(errs)
return
child_rule = self.child_rules.get("W8003")
if child_rule and hasattr(child_rule, "equals_is_useful"):
yield from child_rule.equals_is_useful(
validator, s, instance.get("Fn::Equals", []), schema
)
def schema(self, validator: Validator, instance: Any) -> dict[str, Any]:
return {
"type": "array",
"maxItems": 2,
"minItems": 2,
"fn_items": {
"functions": [
"Ref",
"Fn::FindInMap",
"Fn::Sub",
"Fn::Join",
"Fn::Select",
"Fn::Split",
"Fn::Length",
"Fn::ToJsonString",
],
"schema": {
"type": ["string"],
},
},
}
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