# ###################################
##       Rule Specification        ##
#####################################
# 
# Rule Identifier:
#   ecs_container_insights_enabled_check
# 
# Description:
#   This control checks whether your Amazon ECS clusters have container insights enabled.
# 
# Reports on:
#   AWS::ECS::Cluster
# 
# Evaluates:
#   AWS CloudFormation, AWS CloudFormation hook
# 
# Rule Parameters:
#   None
# 
# Scenarios:
#   Scenario: 1
#     Given: The input document is an AWS CloudFormation document or CloudFormation hook document
#       And: The input document does not contain an ECS cluster resource
#      Then: SKIP
#   Scenario: 2
#     Given: The input document is an AWS CloudFormation document or CloudFormation hook document
#       And: The input document contains an ECS cluster resource
#       And: 'ClusterSettings' property is not present or is an empty list
#      Then: FAIL
#   Scenario: 3
#     Given: The input document is an AWS CloudFormation document or CloudFormation hook document
#       And: The input document contains an ECS cluster resource
#       And: 'ClusterSettings' property is present
#       And: An entry with 'Name' set to 'containerInsights' is not present in 'ClusterSettings'
#      Then: FAIL
#   Scenario: 4
#     Given: The input document is an AWS CloudFormation document or CloudFormation hook document
#       And: The input document contains an ECS cluster resource
#       And: 'ClusterSettings' property is present
#       And: An entry with 'Name' set to 'containerInsights' is present in 'ClusterSettings' with a 'Value' not set
#            to 'enabled'
#      Then: FAIL
#   Scenario: 5
#     Given: The input document is an AWS CloudFormation document or CloudFormation hook document
#       And: The input document contains an ECS cluster resource
#       And: 'ClusterSettings' property is present
#       And: An entry with 'Name' set to 'containerInsights' is present in 'ClusterSettings' with a 'Value' set to
#            'enabled'
#      Then: PASS

#
# Constants
#
let ECS_CLUSTER_TYPE = "AWS::ECS::Cluster"
let INPUT_DOCUMENT = this

#
# Assignments
#
let ecs_clusters = Resources.*[ Type == %ECS_CLUSTER_TYPE ]

#
# Primary Rules
#
rule ecs_container_insights_enabled_check when is_cfn_template(%INPUT_DOCUMENT)
                                               %ecs_clusters not empty {
    check(%ecs_clusters.Properties)
        <<
        [CT.ECS.PR.2]: Require any Amazon ECS cluster to have container insights activated
        [FIX]: Enable container insights on Amazon ECS clusters with an entry in 'ClusterSettings' that has 'Name' set to 'containerInsights' and 'Value' set to 'enabled'.
        >>
}

rule ecs_container_insights_enabled_check when is_cfn_hook(%INPUT_DOCUMENT, %ECS_CLUSTER_TYPE) {
    check(%INPUT_DOCUMENT.%ECS_CLUSTER_TYPE.resourceProperties)
        <<
        [CT.ECS.PR.2]: Require any Amazon ECS cluster to have container insights activated
        [FIX]: Enable container insights on Amazon ECS clusters with an entry in 'ClusterSettings' that has 'Name' set to 'containerInsights' and 'Value' set to 'enabled'.
        >>
}

#
# Parameterized Rules
#
rule check(ecs_cluster) {
    %ecs_cluster {
        # Scenario 2
        ClusterSettings exists
        ClusterSettings is_list
        ClusterSettings not empty

        # Scenario 3, 4 and 5
        some ClusterSettings[*] {
            Name exists
            Value exists

            Name is_string
            Value is_string

            Name == "containerInsights"
            Value == "enabled"
        }
    }
}

#
# Utility Rules
#
rule is_cfn_template(doc) {
    %doc {
        AWSTemplateFormatVersion exists or
        Resources exists
    }
}

rule is_cfn_hook(doc, RESOURCE_TYPE) {
    %doc.%RESOURCE_TYPE.resourceProperties exists
}