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"""
Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
SPDX-License-Identifier: MIT-0
"""
from cfnlint.rules import CloudFormationLintRule, RuleMatch


class Split(CloudFormationLintRule):
    """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"]
    supported_functions = [
        "Fn::Base64",
        "Fn::FindInMap",
        "Fn::GetAZs",
        "Fn::GetAtt",
        "Fn::If",
        "Fn::ImportValue",
        "Fn::Join",
        "Fn::Select",
        "Fn::Sub",
        "Ref",
        "Fn::ToJsonString",
    ]

    def _test_delimiter(self, delimiter, path):
        matches = []
        if not isinstance(delimiter, str):
            message = "Split delimiter has to be of type string for {0}"
            matches.append(RuleMatch(path, message.format("/".join(map(str, path)))))
        return matches

    def _test_string(self, s, path):
        matches = []
        if isinstance(s, dict):
            if len(s) == 1:
                for key, _ in s.items():
                    if key not in self.supported_functions:
                        message = "Fn::Split doesn't support the function {0} at {1}"
                        matches.append(
                            RuleMatch(
                                path + [key],
                                message.format(key, "/".join(map(str, path))),
                            )
                        )
            else:
                message = "Split list of singular function or string for {0}"
                matches.append(
                    RuleMatch(path, message.format("/".join(map(str, path))))
                )
        elif not isinstance(s, str):
            message = "Split has to be of type string or valid function for {0}"
            matches.append(RuleMatch(path, message.format("/".join(map(str, path)))))
        return matches

    def _test_split(self, split_obj, path):
        matches = []
        if not isinstance(split_obj, list):
            message = "Split should be an array of 2 for {0}"
            matches.append(RuleMatch(path, message.format("/".join(map(str, path)))))
            return matches

        if len(split_obj) != 2:
            message = "Split should be an array of 2 for {0}"
            matches.append(RuleMatch(path, message.format("/".join(map(str, path)))))
            return matches

        split_delimiter = split_obj[0]
        split_string = split_obj[1]
        matches.extend(self._test_delimiter(split_delimiter, path[:] + [0]))
        matches.extend(self._test_string(split_string, path[:] + [1]))

        return matches

    def match(self, cfn):
        matches = []

        split_objs = cfn.search_deep_keys("Fn::Split")

        for split_obj in split_objs:
            split_value_obj = split_obj[-1]
            tree = split_obj[:-1]
            matches.extend(self._test_split(split_value_obj, tree[:]))

        return matches

Filemanager

Name Type Size Permission Actions
__pycache__ Folder 0755
Base64.py File 1.72 KB 0644
Cidr.py File 11.94 KB 0644
DynamicReferenceSecureString.py File 5.72 KB 0644
FindInMap.py File 11.25 KB 0644
FindInMapKeys.py File 3.89 KB 0644
GetAtt.py File 6.05 KB 0644
GetAz.py File 2.76 KB 0644
If.py File 1.45 KB 0644
ImportValue.py File 2.45 KB 0644
Join.py File 8.63 KB 0644
Length.py File 3.31 KB 0644
Not.py File 978 B 0644
Ref.py File 1.02 KB 0644
RefExist.py File 1.26 KB 0644
RefInCondition.py File 1.36 KB 0644
RelationshipConditions.py File 5.35 KB 0644
Select.py File 4.41 KB 0644
Split.py File 3.11 KB 0644
Sub.py File 9.49 KB 0644
SubNeeded.py File 5.48 KB 0644
SubNotJoin.py File 2 KB 0644
SubParametersUsed.py File 1.4 KB 0644
SubUnneeded.py File 1.27 KB 0644
ToJsonString.py File 1.75 KB 0644
__init__.py File 106 B 0644