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


class OnlyOne(CloudFormationLintRule):
    """Check Properties Resource Configuration"""

    id = "E2523"
    shortdesc = "Check Properties that need only one of a list of properties"
    description = (
        "Making sure CloudFormation properties "
        + "that require only one property from a list. "
        + "One has to be specified."
    )
    source_url = "https://github.com/aws-cloudformation/cfn-python-lint"
    tags = ["resources"]

    def __init__(self):
        """Init"""
        super().__init__()
        onlyonespec = cfnlint.helpers.load_resource(AdditionalSpecs, "OnlyOne.json")
        self.resource_types_specs = onlyonespec["ResourceTypes"]
        self.property_types_specs = onlyonespec["PropertyTypes"]
        for resource_type_spec in self.resource_types_specs:
            self.resource_property_types.append(resource_type_spec)
        for property_type_spec in self.property_types_specs:
            self.resource_sub_property_types.append(property_type_spec)

    def check(self, properties, onlyoneprops, path, cfn):
        """Check itself"""
        matches = []

        for onlyoneprop in onlyoneprops:
            for safe_properties, safe_path in properties.items_safe(path):
                property_sets = cfn.get_object_without_conditions(
                    safe_properties, onlyoneprop
                )
                for property_set in property_sets:
                    count = 0
                    for prop in onlyoneprop:
                        if prop in property_set["Object"]:
                            count += 1

                    if count != 1:
                        if property_set["Scenario"] is None:
                            message = "Only one of [{0}] should be specified for {1}"
                            matches.append(
                                RuleMatch(
                                    path,
                                    message.format(
                                        ", ".join(map(str, onlyoneprop)),
                                        "/".join(map(str, safe_path)),
                                    ),
                                )
                            )
                        else:
                            scenario_text = " and ".join(
                                [
                                    f'when condition "{k}" is {v}'
                                    for (k, v) in property_set["Scenario"].items()
                                ]
                            )
                            message = "Only one of [{0}] should be specified {1} at {2}"
                            matches.append(
                                RuleMatch(
                                    path,
                                    message.format(
                                        ", ".join(map(str, onlyoneprop)),
                                        scenario_text,
                                        "/".join(map(str, safe_path)),
                                    ),
                                )
                            )

        return matches

    def match_resource_sub_properties(self, properties, property_type, path, cfn):
        """Match for sub properties"""
        matches = []

        onlyoneprops = self.property_types_specs.get(property_type, {})
        matches.extend(self.check(properties, onlyoneprops, path, cfn))

        return matches

    def match_resource_properties(self, properties, resource_type, path, cfn):
        """Check CloudFormation Properties"""
        matches = []

        onlyoneprops = self.resource_types_specs.get(resource_type, {})
        matches.extend(self.check(properties, onlyoneprops, path, cfn))

        return matches

Filemanager

Name Type Size Permission Actions
__pycache__ Folder 0755
AllowedPattern.py File 5.76 KB 0644
AllowedValue.py File 4.8 KB 0644
AtLeastOne.py File 4.11 KB 0644
AvailabilityZone.py File 3.41 KB 0644
BasedOnValue.py File 6.33 KB 0644
Exclusive.py File 3.98 KB 0644
ImageId.py File 2.37 KB 0644
Inclusive.py File 3.7 KB 0644
JsonSize.py File 6.08 KB 0644
ListDuplicates.py File 4.39 KB 0644
ListDuplicatesAllowed.py File 4.76 KB 0644
ListSize.py File 4.88 KB 0644
NumberSize.py File 4.88 KB 0644
OnlyOne.py File 3.89 KB 0644
Password.py File 3.63 KB 0644
Properties.py File 27.49 KB 0644
PropertiesTemplated.py File 2.44 KB 0644
Required.py File 4.1 KB 0644
RequiredBasedOnValue.py File 831 B 0644
StringSize.py File 4.52 KB 0644
UnwantedBasedOnValue.py File 837 B 0644
ValuePrimitiveType.py File 11.6 KB 0644
ValueRefGetAtt.py File 11.96 KB 0644
__init__.py File 106 B 0644