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"""
Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
SPDX-License-Identifier: MIT-0
"""
import json

from cfnlint.rules import CloudFormationLintRule, RuleMatch


class EventsLogGroupName(CloudFormationLintRule):
    """Check if the settings of multiple subscriptions are included for one LogGroup"""

    id = "E2529"
    shortdesc = "Check for SubscriptionFilters have beyond 2 attachments to a CloudWatch Log Group"
    description = (
        "The current limit for a CloudWatch Log Group is they can have 2 subscription filters. "
        "We will look for duplicate LogGroupNames inside Subscription Filters and make sure they are within 2. "
        "This doesn't account for any other subscription filters getting set."
    )
    source_url = "https://github.com/awslabs/serverless-application-model/blob/master/versions/2016-10-31.md#user-content-cloudwatchlogs"
    tags = ["resources", "lambda"]
    limit = 2

    def check_events_subscription_duplicated(self, cfn):
        """Check if Lambda Events Subscription is duplicated"""
        matches = []
        message = f"You can only have {self.limit} Subscription Filters per CloudWatch Log Group"

        log_group_paths = self.__get_log_group_name_list(cfn)
        for _, c in log_group_paths.items():
            if len(c) > self.limit:
                matches.append(RuleMatch(["Resources", c[2]], message))

        return matches

    def __get_log_group_name_list(self, cfn):
        log_group_paths = {}
        for value in cfn.get_resources("AWS::Logs::SubscriptionFilter").items():
            prop = value[1].get("Properties")
            log_group_name = json.dumps(prop.get("LogGroupName"))

            if log_group_name not in log_group_paths:
                log_group_paths[log_group_name] = []

            log_group_paths[log_group_name].append(value[0])
        return log_group_paths

    def match(self, cfn):
        """Check if Lambda Events Subscription is duplicated"""
        matches = []
        matches.extend(self.check_events_subscription_duplicated(cfn))
        return matches

Filemanager

Name Type Size Permission Actions
__pycache__ Folder 0755
DeprecatedRuntime.py File 2.29 KB 0644
DeprecatedRuntimeEnd.py File 1.4 KB 0644
DeprecatedRuntimeEol.py File 1.65 KB 0644
EventsLogGroupName.py File 2.05 KB 0644
__init__.py File 106 B 0644