| """ |
| Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved. |
| SPDX-License-Identifier: MIT-0 |
| """ |
|
|
| from __future__ import annotations |
|
|
| import json |
| from collections import deque |
| from typing import Any |
|
|
| import regex as re |
|
|
| from cfnlint.helpers import REGEX_DYN_REF |
| from cfnlint.jsonschema import ValidationError, ValidationResult, Validator |
| from cfnlint.rules.functions._BaseFn import BaseFn |
|
|
|
|
| class Split(BaseFn): |
| """Check if Split values are correct""" |
|
|
| id = "E1018" |
| shortdesc = "Split validation of parameters" |
| description = "Making sure the split function is properly configured" |
| source_url = "https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/intrinsic-function-reference-split.html" |
| tags = ["functions", "split"] |
|
|
| def __init__(self) -> None: |
| super().__init__("Fn::Split", ("array",), resolved_rule="W1033") |
|
|
| def schema(self, validator: Validator, instance: Any) -> dict[str, Any]: |
| return { |
| "type": "array", |
| "maxItems": 2, |
| "minItems": 2, |
| "fn_items": [ |
| { |
| "schema": { |
| "type": ["string"], |
| } |
| }, |
| { |
| "functions": [ |
| "Fn::Base64", |
| "Fn::FindInMap", |
| "Fn::GetAtt", |
| "Fn::GetAZs", |
| "Fn::If", |
| "Fn::ImportValue", |
| "Fn::Join", |
| "Fn::Select", |
| "Fn::Sub", |
| "Ref", |
| ], |
| "schema": { |
| "type": ["string"], |
| }, |
| }, |
| ], |
| } |
|
|
| def fn_split( |
| self, validator: Validator, s: Any, instance: Any, schema: Any |
| ) -> ValidationResult: |
| errs = list(super().validate(validator, s, instance, schema)) |
| if errs: |
| yield from iter(errs) |
| return |
|
|
| key, value = self.key_value(instance) |
| if re.fullmatch(REGEX_DYN_REF, json.dumps(value[1])): |
| yield ValidationError( |
| f"{key!r} does not support dynamic references", |
| validator=self.fn.py, |
| path=deque([key, 1]), |
| ) |
|
|
