AWSTemplateFormatVersion: 2010-09-09
Description: Template for Best Practice VPC with 1-3 AZs

Parameters:
  ClusterName:
    Description: ClusterName used to prefix resource names
    Type: String
  VpcId:
    Description: VPC Id
    Type: String
  LocalZoneName:
    Description: Local Zone Name (Example us-east-1-bos-1)
    Type: String
  LocalZoneNameShort:
    Description: Short name for Local Zone used on tag Name (Example bos1)
    Type: String
  PublicRouteTableId:
    Description: Public Route Table ID to associate the Local Zone subnet
    Type: String
  PublicSubnetCidr:
    AllowedPattern: ^(([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])\.){3}([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])(\/(1[6-9]|2[0-4]))$
    ConstraintDescription: CIDR block parameter must be in the form x.x.x.x/16-24.
    Default: 10.0.128.0/20
    Description: CIDR block for Public Subnet
    Type: String

Resources:
  PublicSubnet:
    Type: "AWS::EC2::Subnet"
    Properties:
      VpcId: !Ref VpcId
      CidrBlock: !Ref PublicSubnetCidr
      AvailabilityZone: !Ref LocalZoneName
      Tags:
      - Key: Name
        Value: !Join
          - ""
          - [ !Ref ClusterName, "-public-", !Ref LocalZoneNameShort, "-1" ]
      - Key: kubernetes.io/cluster/unmanaged
        Value: "true"

  PublicSubnetRouteTableAssociation:
    Type: "AWS::EC2::SubnetRouteTableAssociation"
    Properties:
      SubnetId: !Ref PublicSubnet
      RouteTableId: !Ref PublicRouteTableId

Outputs:
  PublicSubnetIds:
    Description: Subnet IDs of the public subnets.
    Value:
      !Join [
        "",
        [!Ref PublicSubnet]
      ]