---
AWSTemplateFormatVersion: 2010-09-09


Description: SASKV5 VPC + Bastion


Parameters:

  TemplateBucket:
    Type: String
    Default: awslabs-startup-kit-templates-deploy-v5
    Description: The template bucket for the CloudFormation templates

  AvailabilityZone1:
    Description: The first availability zone in the region
    Type: AWS::EC2::AvailabilityZone::Name
    ConstraintDescription: Must be a valid availability zone

  AvailabilityZone2:
    Description: The second availability zone in the region
    Type: AWS::EC2::AvailabilityZone::Name
    ConstraintDescription: Must be a valid availability zone

  SSHFrom:
    Description: Limit SSH access to bastion hosts to a CIDR IP block
    Type: String
    MinLength: 9
    MaxLength: 18
    Default: 0.0.0.0/0

  ELBIngressPort:
    Description: The ELB ingress port used by security groups
    Type: Number
    MinValue: 0
    MaxValue: 65535
    ConstraintDescription: TCP ports must be between 0 - 65535
    Default: 80

  AppIngressPort:
    Description: The application ingress port used by security groups
    Type: Number
    MinValue: 0
    MaxValue: 65535
    ConstraintDescription: TCP ports must be between 0 - 65535
    Default: 80

  KeyName:
    Description: EC2 key pair name for bastion host SSH access
    Type: AWS::EC2::KeyPair::KeyName

  LogRetentionInDays:
    Description: Number of days you would like your CloudWatch Logs to be retained
    Type: Number
    Default: 90

  # For more information on the google-authenticator PAM module, see: https://github.com/google/google-authenticator-libpam
  MFA:
    Description: Set to true to install MFA using the google-authenticator PAM module on your bastion host
    Type: String
    ConstraintDescription: Value must be true or false
    Default: false
    AllowedValues:
      - true
      - false

  EnvironmentName:
    Type: String
    Description: Environment name - dev or prod
    Default: dev
    AllowedValues:
      - dev
      - prod
    ConstraintDescription: Specify either dev or prod

Metadata:
  AWS::CloudFormation::Interface:
    ParameterGroups:
      - Label:
          default: Environment
        Parameters:
          - EnvironmentName
      - Label:
          default: Region Availability Zones
        Parameters:
          - AvailabilityZone1
          - AvailabilityZone2
      - Label:
          default: Ingress Ports
        Parameters:
          - ELBIngressPort
          - AppIngressPort
      - Label:
          default: Bastion
        Parameters:
          - KeyName
          - LogRetentionInDays
          - MFA
          - SSHFrom
    ParameterLabels:
      AvailabilityZone1:
        default: Availability Zone 1
      AvailabilityZone2:
        default: Availability Zone 2
      ELBIngressPort:
        default: Load Balancer Port
      AppIngressPort:
        default: Application Port
      SSHFrom:
        default: Bastion SSH Whitelist
      TemplateBucket:
        default: CloudFormation Bucket
      EnvironmentName:
        default: Environment
      KeyName:
        default: EC2 Key Pair
      LogRetentionInDays:
        default: Log Retention
      MFA:
        default: Multi-Factor
      SSHFrom:
        default: SSH Whitelist


Conditions:

   IsProd: !Equals [ !Ref EnvironmentName, prod ]


Resources:

  VpcStack:
    Type: AWS::CloudFormation::Stack
    Properties:
      TemplateURL: !Sub https://s3.amazonaws.com/${TemplateBucket}/templates/vpc.cfn.yml
      Parameters:
        AvailabilityZone1: !Ref AvailabilityZone1
        AvailabilityZone2: !Ref AvailabilityZone2
        SSHFrom: !Ref SSHFrom
        ELBIngressPort: !Ref ELBIngressPort
        AppIngressPort: !Ref AppIngressPort
        SingleNatGateway: !If [ IsProd, false, true ]

  BastionStack:
    Type: AWS::CloudFormation::Stack
    Properties:
      TemplateURL: !Sub https://s3.amazonaws.com/${TemplateBucket}/templates/bastion.cfn.yml
      Parameters:
        NetworkStackName: !GetAtt VpcStack.Outputs.Name
        KeyName: !Ref KeyName
        LogRetentionInDays: !Ref LogRetentionInDays
        MFA: !Ref MFA
    DependsOn: VpcStack


Outputs:

  VpcStackName:
    Value: !GetAtt VpcStack.Outputs.Name
    Export:
      Name: !Sub ${AWS::StackName}-VpcStackName

  BastionStackName:
    Value: !GetAtt BastionStack.Outputs.Name
    Export:
      Name: !Sub ${AWS::StackName}-BastionStackName