Generic lambda cron CloudFormation substack

rule.json

{
  "Parameters": {
    "TARGET_LAMBDA_ARN": {
      "Type": "String"
    },
    "EXEC_SCHEDULE": {
      "Type": "String"
    },
    "RULE_NAME": {
      "Type": "String"
    }
  },
  "Resources": {
    "LambdaScheduledJob": {
      "DependsOn": [
        "LambdaScheduledJobInvokeRole"
      ],
      "Type": "AWS::Events::Rule",
      "Properties": {
        "Name": {
          "Ref": "RULE_NAME"
        },
        "RoleArn": {
          "Fn::GetAtt": [
            "LambdaScheduledJobInvokeRole",
            "Arn"
          ]
        },
        "ScheduleExpression": {
          "Ref": "EXEC_SCHEDULE"
        },
        "State": "ENABLED",
        "Targets": [
          {
            "Arn": {
              "Ref": "TARGET_LAMBDA_ARN",
              "Id": "lambda-cron"
            }
          }
        ]
      }
    },
    "LambdaScheduledJobInvokeRole": {
      "Type": "AWS::IAM::Role",
      "Properties": {
        "AssumeRolePolicyDocument": {
          "Version" : "2012-10-17",
          "Statement": [
            {
              "Effect": "Allow",
              "Principal": {
                "Service": [
                  "events.amazonaws.com"
                ]
              },
              "Action": [
                "sts:AssumeRole"
              ]
            }
          ]
        },
        "Path": "/",
        "Policies": [
          {
            "PolicyName": "LambdaInvokePolicy",
            "PolicyDocument": {
              "Version" : "2012-10-17",
              "Statement": [
                {
                  "Effect": "Allow",
                  "Action": "lambda:InvokeFunction",
                  "Resource": {
                    "Ref": "TARGET_LAMBDA_ARN"
                  }
                }
              ]
            }
          }
        ]
      }
    }
  },
  "Outputs": {
    "RuleId": {
      "Description": "The event RuleId in CloudFormation",
      "Value": {
        "Ref": "LambdaScheduledJob"
      }
    },
    "RuleArn": {
      "Description": "The event ARN",
      "Value": {
        "Fn::GetAtt": [
          "LambdaScheduledJob",
          "Arn"
        ]
      }
    }
  }
}