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


class Required(CloudFormationLintRule):
    """Check Required Resource Configuration"""

    id = "E3003"
    shortdesc = "Required Resource properties are missing"
    description = "Making sure that Resources properties that are required exist"
    source_url = "https://github.com/aws-cloudformation/cfn-python-lint/blob/main/docs/cfn-resource-specification.md#required"
    tags = ["resources"]

    def __init__(self):
        """Init"""
        super().__init__()
        self.resourcetypes = []
        self.propertytypes = []

    def initialize(self, cfn):
        """Initialize the rule"""
        resourcespecs = cfnlint.helpers.RESOURCE_SPECS[cfn.regions[0]]
        self.resourcetypes = resourcespecs["ResourceTypes"]
        self.propertytypes = resourcespecs["PropertyTypes"]
        self.resource_property_types = []
        self.resource_sub_property_types = []
        for resource_type_spec in self.resourcetypes.keys():
            self.resource_property_types.append(resource_type_spec)
        for property_type_spec in self.propertytypes.keys():
            self.resource_sub_property_types.append(property_type_spec)

    def _get_required_attrs_specs(self, resource_specs):
        reqr = []
        for k, v in resource_specs.get("Properties", {}).items():
            if v.get("Required", False):
                reqr.append(k)

        return reqr

    def check_obj(self, obj, required_attributes, path, _):
        matches = []

        for safe_obj, safe_path in obj.items_safe(path):
            for required_attribute in required_attributes:
                if required_attribute not in safe_obj:
                    message = "Property {0} missing at {1}"
                    matches.append(
                        RuleMatch(
                            safe_path,
                            message.format(
                                required_attribute, "/".join(map(str, safe_path))
                            ),
                        )
                    )

        return matches

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

        if properties is None:
            # covered under rule E3001.  If there are required properties properties is required first
            return matches

        matches.extend(
            self.check_obj(
                properties,
                self._get_required_attrs_specs(self.resourcetypes.get(resource_type)),
                path,
                cfn,
            )
        )

        return matches

    def match_resource_sub_properties(self, properties, property_type, path, cfn):
        """Check CloudFormation Properties"""
        matches = []
        matches.extend(
            self.check_obj(
                properties,
                self._get_required_attrs_specs(self.propertytypes.get(property_type)),
                path,
                cfn,
            )
        )

        return matches

    def match(self, cfn):
        """Check CloudFormation Properties"""
        matches = []

        for resourcename, resourcevalue in cfn.get_resources().items():
            if "Properties" in resourcevalue and "Type" in resourcevalue:
                resource_type = resourcevalue["Type"]
                if (
                    resource_type.startswith("Custom::")
                    and resource_type not in self.resourcetypes
                ):
                    resource_type = "AWS::CloudFormation::CustomResource"
                    matches.extend(
                        self.check_obj(
                            resourcevalue["Properties"],
                            self._get_required_attrs_specs(
                                self.resourcetypes.get(resource_type)
                            ),
                            ["Resources", resourcename, "Properties"],
                            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