forked from aws-cloudformation/cfn-lint
-
Notifications
You must be signed in to change notification settings - Fork 0
/
Ref.py
33 lines (27 loc) · 1.02 KB
/
Ref.py
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
"""
Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
SPDX-License-Identifier: MIT-0
"""
from cfnlint.rules import CloudFormationLintRule, RuleMatch
class Ref(CloudFormationLintRule):
"""Check if Ref value is a string"""
id = "E1020"
shortdesc = "Ref validation of value"
description = (
"Making sure the Ref has a String value (no other functions are supported)"
)
source_url = "https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/intrinsic-function-reference-ref.html"
tags = ["functions", "ref"]
def match(self, cfn):
matches = []
ref_objs = cfn.search_deep_keys("Ref")
for ref_obj in ref_objs:
value = ref_obj[-1]
if not isinstance(value, (str)):
message = "Ref can only be a string for {0}"
matches.append(
RuleMatch(
ref_obj[:-1], message.format("/".join(map(str, ref_obj[:-1])))
)
)
return matches