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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 SubNotJoin(CloudFormationLintRule):
    """Check if Join is being used with no join characters"""

    id = "I1022"
    shortdesc = "Use Sub instead of Join"
    description = (
        "Prefer a sub instead of Join when using a join delimiter that is empty"
    )
    source_url = "https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/intrinsic-function-reference-sub.html"
    tags = ["functions", "sub", "join"]

    def _check_element(self, element):
        if isinstance(element, dict):
            if len(element) == 1:
                for key, value in element.items():
                    if key in ["Fn::Sub"]:
                        if not isinstance(value, str):
                            return False
                    elif key not in ["Ref", "Fn::GetAtt"]:
                        return False

        return True

    def _check_elements(self, elements):
        for element in elements:
            if not self._check_element(element):
                return False

        return True

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

        join_objs = cfn.search_deep_keys("Fn::Join")

        for join_obj in join_objs:
            if isinstance(join_obj[-1], list):
                join_operator = join_obj[-1][0]
                join_elements = join_obj[-1][1]
                if isinstance(join_operator, str):
                    if join_operator == "":
                        if isinstance(join_elements, list):
                            if self._check_elements(join_elements):
                                matches.append(
                                    RuleMatch(
                                        join_obj[0:-1],
                                        "Prefer using Fn::Sub over Fn::Join with an empty delimiter",
                                    )
                                )
        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