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


class ListSize(CloudFormationLintRule):
    """Check if List has a size within the limit"""

    id = "E3032"
    shortdesc = "Check if a list has between min and max number of values specified"
    description = "Check lists for the number of items in the list to validate they are between the minimum and maximum"
    source_url = "https://github.com/awslabs/cfn-python-lint/blob/main/docs/cfn-resource-specification.md#allowedpattern"
    tags = ["resources", "property", "list", "size"]

    def initialize(self, cfn):
        """Initialize the rule"""
        for resource_type_spec in RESOURCE_SPECS.get(cfn.regions[0]).get(
            "ResourceTypes"
        ):
            self.resource_property_types.append(resource_type_spec)
        for property_type_spec in RESOURCE_SPECS.get(cfn.regions[0]).get(
            "PropertyTypes"
        ):
            self.resource_sub_property_types.append(property_type_spec)

    def check_value(self, properties, path, property_name, cfn, value_specs):
        """Check Value"""
        matches = []

        # Get the Min and Max for a List
        list_min = value_specs.get("ListMin")
        list_max = value_specs.get("ListMax")

        if list_min is not None and list_max is not None:
            property_sets = cfn.get_object_without_conditions(properties)
            for property_set in property_sets:
                prop = property_set.get("Object").get(property_name)
                if isinstance(prop, list):
                    if not list_min <= len(prop) <= list_max:
                        if property_set["Scenario"] is None:
                            message = (
                                "{0} has to have between {1} and {2} items specified"
                            )
                            matches.append(
                                RuleMatch(
                                    path + [property_name],
                                    message.format(property_name, list_min, list_max),
                                )
                            )
                        else:
                            scenario_text = " and ".join(
                                [
                                    f'when condition "{k}" is {v}'
                                    for (k, v) in property_set["Scenario"].items()
                                ]
                            )
                            message = "{0} has to have between {1} and {2} items specified when {3}"
                            matches.append(
                                RuleMatch(
                                    path + [property_name],
                                    message.format(
                                        property_name, list_min, list_max, scenario_text
                                    ),
                                )
                            )

        return matches

    def check(self, cfn, properties, specs, path):
        """Check itself"""
        matches = []
        for p_value, p_path in properties.items_safe(path[:]):
            for prop in p_value:
                if prop in specs:
                    value = specs.get(prop).get("Value", {})
                    if value:
                        value_type = value.get("ListValueType", "")
                        property_type = specs.get(prop).get("Type")
                        if property_type == "List":
                            matches.extend(
                                self.check_value(
                                    p_value,
                                    p_path,
                                    prop,
                                    cfn,
                                    RESOURCE_SPECS.get(cfn.regions[0])
                                    .get("ValueTypes")
                                    .get(value_type, {}),
                                )
                            )
        return matches

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

        specs = (
            RESOURCE_SPECS.get(cfn.regions[0])
            .get("PropertyTypes")
            .get(property_type, {})
            .get("Properties", {})
        )
        matches.extend(self.check(cfn, properties, specs, path))

        return matches

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

        specs = (
            RESOURCE_SPECS.get(cfn.regions[0])
            .get("ResourceTypes")
            .get(resource_type, {})
            .get("Properties", {})
        )
        matches.extend(self.check(cfn, properties, specs, path))

        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