# CloudFormation Workshop - Template 1
#
# Resources built:
#
# (1) An Amazon VPC
# (2) A public subnet
# (3) An Internet gateway
# (4) A route table
# (5) A default route
#
# Output values:
#
# VpcId - The ID of the VPC (e.g. vpc-123456789012345)
# SubnetId - The ID of the subnet (e.g. subnet-123456789012345)
# AzId - The Availability Zone of the subnet (e.g. us-east-1a)
---
AWSTemplateFormatVersion: '2010-09-09'

Description: Create a VPC

Mappings:
  RegionMap:
    us-east-1:
      VpcCidr: 10.201.0.0/16
      SubnetCidr: 10.201.1.0/24
    us-east-2:
      VpcCidr: 10.202.0.0/16
      SubnetCidr: 10.202.1.0/24
    us-west-1:
      VpcCidr: 10.203.0.0/16
      SubnetCidr: 10.203.1.0/24
    us-west-2:
      VpcCidr: 10.204.0.0/16
      SubnetCidr: 10.204.1.0/24
    ca-central-1:
      VpcCidr: 10.205.0.0/16
      SubnetCidr: 10.205.1.0/24
    eu-central-1:
      VpcCidr: 10.206.0.0/16
      SubnetCidr: 10.206.1.0/24
    eu-west-1:
      VpcCidr: 10.207.0.0/16
      SubnetCidr: 10.207.1.0/24
    eu-west-2:
      VpcCidr: 10.208.0.0/16
      SubnetCidr: 10.208.1.0/24
    eu-west-3:
      VpcCidr: 10.209.0.0/16
      SubnetCidr: 10.209.1.0/24
    ap-northeast-1:
      VpcCidr: 10.210.0.0/16
      SubnetCidr: 10.210.1.0/24
    ap-northeast-2:
      VpcCidr: 10.211.0.0/16
      SubnetCidr: 10.211.1.0/24
    ap-northeast-3:
      VpcCidr: 10.212.0.0/16
      SubnetCidr: 10.212.1.0/24
    ap-southeast-1:
      VpcCidr: 10.213.0.0/16
      SubnetCidr: 10.213.1.0/24
    ap-southeast-2:
      VpcCidr: 10.214.0.0/16
      SubnetCidr: 10.214.1.0/24
    ap-south-1:
      VpcCidr: 10.215.0.0/16
      SubnetCidr: 10.215.1.0/24
    us-gov-west:
      VpcCidr: 10.216.0.0/16
      SubnetCidr: 10.216.1.0/24
    cn-north-1:
      VpcCidr: 10.217.0.0/16
      SubnetCidr: 10.217.1.0/24
    cn-northwest-1:
      VpcCidr: 10.218.0.0/16
      SubnetCidr: 10.218.1.0/24

Resources:
  Vpc:
    Type: AWS::EC2::VPC
    Properties:
      CidrBlock: !FindInMap [ RegionMap, !Ref "AWS::Region", VpcCidr ]
      EnableDnsHostnames: 'true'

  PublicSubnet:
    Type: AWS::EC2::Subnet
    Properties:
      AvailabilityZone: !Select
        - 0
        - !GetAZs ""
      CidrBlock: !FindInMap [ RegionMap, !Ref "AWS::Region", SubnetCidr ]
      MapPublicIpOnLaunch: 'true'
      VpcId: !Ref Vpc

  VpcIgw:
    Type: AWS::EC2::InternetGateway

  VpcIgwAttachment:
    Type: AWS::EC2::VPCGatewayAttachment
    Properties:
      InternetGatewayId: !Ref VpcIgw
      VpcId: !Ref Vpc

# Note the use of the DependsOn attribute.  You need to use this to delay
# the creation of the route table if it contains a route that reports to
# an Internet Gateway.
#
# See:
#
# https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-attribute-dependson.html

  RouteTable:
    Type: AWS::EC2::RouteTable
    DependsOn: VpcIgwAttachment
    Properties:
      VpcId: !Ref Vpc

  DefaultRoute:
    Type: AWS::EC2::Route
    Properties:
      DestinationCidrBlock: 0.0.0.0/0
      GatewayId: !Ref VpcIgw
      RouteTableId: !Ref RouteTable

  AssociatePublicSubnetToRouteTable:
    Type: AWS::EC2::SubnetRouteTableAssociation
    Properties:
      RouteTableId: !Ref RouteTable
      SubnetId: !Ref PublicSubnet

# Note that the output values are derived from the PublicSubnet resource.
# You can see what values !Ref and !GetAtt return by looking at the
# CloudFormation documentation for AWS::EC2::Subnet at:
#
# https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-resource-ec2-subnet.html

Outputs:

  SubnetId:
    Description: Subnet ID
    Value: !Ref PublicSubnet
    Export:
      Name: SubnetId

  VpcId:
    Description: Vpc ID
    Value: !Ref Vpc
    Export:
      Name: VpcId

  VpcCidr:
    Description: Vpc CIDR block
    Value: !GetAtt Vpc.CidrBlock
    Export:
      Name: VpcCidr

  AzName:
    Description: Subnet Availability Zone
    Value: !GetAtt PublicSubnet.AvailabilityZone
    Export:
      Name: AzName