AWSTemplateFormatVersion: 2010-09-09
Description: This Cloudformation creates Egress Only Internet Gateways for App VPC
Parameters:
  NetworkStackName:
    Description: "Name of the base network stack"
    Type: String
    MinLength: 1
    MaxLength: 255
    AllowedPattern: "^[a-zA-Z][-a-zA-Z0-9]*$"
Resources:
  NATAZ1:
    Type: AWS::EC2::NatGateway
    Properties:
      AllocationId:
        Fn::GetAtt:
          - EIP1
          - AllocationId
      SubnetId: !ImportValue
        "Fn::Sub": "${NetworkStackName}-EgressPublicSubnetAZ1"
      Tags:
        - Key: Name
          Value: Egress_AZ1
  NATAZ2:
    Type: AWS::EC2::NatGateway
    Properties:
      AllocationId:
        Fn::GetAtt:
          - EIP2
          - AllocationId
      SubnetId: !ImportValue
        "Fn::Sub": "${NetworkStackName}-EgressPublicSubnetAZ2"
      Tags:
        - Key: Name
          Value: Egress_AZ2
  EIP1:
    Type: AWS::EC2::EIP
    Properties:
      Domain: vpc
  EIP2:
    Type: AWS::EC2::EIP
    Properties:
      Domain: vpc
  NATRouteAZ1:
    Type: AWS::EC2::Route
    Properties:
      RouteTableId: !ImportValue
        "Fn::Sub": "${NetworkStackName}-EgressPrivateRTAZ1"
      DestinationIpv6CidrBlock: 64:ff9b::/96
      NatGatewayId:
        Ref: NATAZ1
  NATRouteAZ2:
    Type: AWS::EC2::Route
    Properties:
      RouteTableId: !ImportValue
        "Fn::Sub": "${NetworkStackName}-EgressPrivateRTAZ2"
      DestinationIpv6CidrBlock: 64:ff9b::/96
      NatGatewayId:
        Ref: NATAZ2
  IPv6EgressTransitGatewayRoute:
    Type: AWS::EC2::TransitGatewayRoute
    Metadata:
      cfn-lint:
        config:
          ignore_checks:
            - E3031
    Properties:
      DestinationCidrBlock: 64:ff9b::/96
      TransitGatewayRouteTableId: !ImportValue
        "Fn::Sub": "${NetworkStackName}-AppTransitGatewayRouteTable"
      TransitGatewayAttachmentId: !ImportValue
        "Fn::Sub": "${NetworkStackName}-EgressTransitGatewayAttachment"
  App1EC2Route:
    Type: AWS::EC2::Route
    Properties:
      DestinationIpv6CidrBlock: 64:ff9b::/96
      TransitGatewayId: !ImportValue
        "Fn::Sub": "${NetworkStackName}-EC2TransitGateway"
      RouteTableId: !ImportValue
        "Fn::Sub": "${NetworkStackName}-App1PrivateRT"
  App2EC2Route:
    Type: AWS::EC2::Route
    Properties:
      DestinationIpv6CidrBlock: 64:ff9b::/96
      TransitGatewayId: !ImportValue
        "Fn::Sub": "${NetworkStackName}-EC2TransitGateway"
      RouteTableId: !ImportValue
        "Fn::Sub": "${NetworkStackName}-App2PrivateRT"