AWSTemplateFormatVersion: 2010-09-09
Description: Template for Best Practice Subnets (Public and Private)

Parameters:
  VpcId:
    Description: VPC ID which the subnets will be part.
    Type: String
    AllowedPattern: ^(?:(?:vpc)(?:-[a-zA-Z0-9]+)?\b|(?:[0-9]{1,3}\.){3}[0-9]{1,3})$
    ConstraintDescription: VPC ID must be with valid name, starting with vpc-.*.
  ClusterName:
    Description: Cluster Name or Prefix name to prepend the tag Name for each subnet.
    Type: String
    AllowedPattern: ".+"
    ConstraintDescription: ClusterName parameter must be specified.
  ZoneName:
    Description: Zone Name to create the subnets (Example us-west-2-lax-1a).
    Type: String
    AllowedPattern: ".+"
    ConstraintDescription: ZoneName parameter must be specified.
  PublicRouteTableId:
    Description: Public Route Table ID to associate the public subnet.
    Type: String
    AllowedPattern: ".+"
    ConstraintDescription: PublicRouteTableId parameter must be specified.
  PublicSubnetCidr:
    # yamllint disable-line rule:line-length
    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

  PrivateRouteTableId:
    Description: Public Route Table ID to associate the Local Zone subnet
    Type: String
    AllowedPattern: ".+"
    ConstraintDescription: PublicRouteTableId parameter must be specified.
  PrivateSubnetCidr:
    # yamllint disable-line rule:line-length
    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 ZoneName
      Tags:
      - Key: Name
        Value: !Join ['-', [!Ref ClusterName, "public", !Ref ZoneName]]

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

  PrivateSubnet:
    Type: "AWS::EC2::Subnet"
    Properties:
      VpcId: !Ref VpcId
      CidrBlock: !Ref PrivateSubnetCidr
      AvailabilityZone: !Ref ZoneName
      Tags:
      - Key: Name
        Value: !Join ['-', [!Ref ClusterName, "private", !Ref ZoneName]]

  PrivateSubnetRouteTableAssociation:
    Type: "AWS::EC2::SubnetRouteTableAssociation"
    Properties:
      SubnetId: !Ref PrivateSubnet
      RouteTableId: !Ref PrivateRouteTableId

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

  PrivateSubnetId:
    Description: Subnet ID of the private subnets.
    Value:
      !Join ["", [!Ref PrivateSubnet]]