npm package: @smallcase/cdk-vpc-module
Description: cdk-vpc-module construct library is an open-source extension of the AWS Cloud Development Kit (AWS CDK) to deploy configurable aws vpc  and its individual components in less than 50 lines of code and human readable configuration which can be managed by pu
Author: Bharat Parmar
Latest version: 0.0.22

# cdk-vpc-module
cdk-vpc-module construct library is an open-source extension of the AWS Cloud Development Kit (AWS CDK) to deploy configurable aws vpc  and its individual components in less than 50 lines of code and human readable configuration which can be managed by pull requests!

## :sparkles: Features

- :white_check_mark: Option to configure custom IPv4 CIDR(10.10.0.0/24)
- :white_check_mark: VPC Peering with  route table entry
- :white_check_mark: Configurable NACL as per subnet group
- :white_check_mark: NATGateway as per availabilityZones


Using cdk a vpc can be deployed using the following sample code snippet:
```typescript
import { Network } from "@smallcase/cdk-vpc-module/lib/constructs/network";
import { aws_ec2 as ec2, App, Stack, StackProps } from "aws-cdk-lib";
import { Construct } from "constructs";

export class VPCStack extends Stack {
  constructor(scope: Construct, id: string, props: StackProps = {}) {
    const s3EndpointIamPermission = new iam.PolicyStatement({
      actions: ["s3:*"],
      resources: ['arn:aws:s3:::*'],
      principals: [new iam.AnyPrincipal()],
    })
    const monitoringEndpointIamPermission = new iam.PolicyStatement({
      actions: ["*"],
      resources: ['*'],
      principals: [new iam.AnyPrincipal()],
    })
    super(scope, id, props);
    new Network(this, 'NETWORK', {
      vpc: {
        cidr: '10.10.0.0/16',
        subnetConfiguration: [],
      },
      peeringConfigs: {
        "TEST-PEERING": { // this key will be used as your peering id, which you will have to mention below when you configure a route table for your subnets
          peeringVpcId: "vpc-0000",
          tags: {
            "Name": "TEST-PEERING to CREATED-VPC",
            "Description": "Connect"
          }
        }
      },
      subnets: [
        {
          subnetGroupName: 'NATGateway',
          subnetType: ec2.SubnetType.PUBLIC,
          cidrBlock: ['10.10.0.0/28', '10.10.0.16/28', '10.10.0.32/28'],
          availabilityZones: ['ap-south-1a', 'ap-south-1b', 'ap-south-1c'],
          ingressNetworkACL: [
            {
              cidr: ec2.AclCidr.ipv4('0.0.0.0/0'),
              traffic: ec2.AclTraffic.allTraffic(),
            },
          ],
          routes: [
          ],
          egressNetworkACL: [
            {
              cidr: ec2.AclCidr.ipv4('0.0.0.0/0'),
              traffic: ec2.AclTraffic.allTraffic(),
            },
          ],
        },
        {
          subnetGroupName: 'Public',
          subnetType: ec2.SubnetType.PUBLIC,
          cidrBlock: ['10.10.2.0/24', '10.10.3.0/24', '10.10.4.0/24'],
          availabilityZones: ['ap-south-1a', 'ap-south-1b', 'ap-south-1c'],
          ingressNetworkACL: [
            {
              cidr: ec2.AclCidr.ipv4('0.0.0.0/0'),
              traffic: ec2.AclTraffic.allTraffic(),
            },
          ],
          egressNetworkACL: [
            {
              cidr: ec2.AclCidr.ipv4('0.0.0.0/0'),
              traffic: ec2.AclTraffic.allTraffic(),
            },
          ],
          routes: [
          ],
          tags: {
            // if you use this vpc for your eks cluster, you have to tag your subnets [read more](https://aws.amazon.com/premiumsupport/knowledge-center/eks-vpc-subnet-discovery/)
            'kubernetes.io/role/elb': '1',
            'kubernetes.io/cluster/TEST-CLUSTER': 'owned',
          },
        },
        {
          subnetGroupName: 'Private',
          subnetType: ec2.SubnetType.PRIVATE_WITH_NAT,
          cidrBlock: ['10.10.5.0/24', '10.10.6.0/24', '10.10.7.0/24'],
          availabilityZones: ['ap-south-1a', 'ap-south-1b', 'ap-south-1c'],
          ingressNetworkACL: [
            {
              cidr: ec2.AclCidr.ipv4('0.0.0.0/0'),
              traffic: ec2.AclTraffic.allTraffic(),
            },
          ],
          egressNetworkACL: [
            {
              cidr: ec2.AclCidr.ipv4('0.0.0.0/0'),
              traffic: ec2.AclTraffic.allTraffic(),
            },

          ],
          routes: [
            {
            // if you use this vpc for your eks cluster, you have to tag your subnets [read more](https://aws.amazon.com/premiumsupport/knowledge-center/eks-vpc-subnet-discovery/)
              routerType: ec2.RouterType.VPC_PEERING_CONNECTION,
              destinationCidrBlock: "<destinationCidrBlock>",
              //<Your VPC PeeringConfig KEY, in this example TEST-PEERING will be your ID>
              existingVpcPeeringRouteKey: "TEST-PEERING"
            }
          ],
          tags: {
            'kubernetes.io/role/internal-elb': '1',
            'kubernetes.io/cluster/TEST-CLUSTER': 'owned',
          },
        },
        {
          subnetGroupName: 'Database',
          subnetType: ec2.SubnetType.PRIVATE_WITH_NAT,
          cidrBlock: ['10.10.14.0/27', '10.10.14.32/27', '10.10.14.64/27'],
          availabilityZones: ['ap-south-1a', 'ap-south-1b', 'ap-south-1c'],
          ingressNetworkACL: [
            {
              cidr: ec2.AclCidr.ipv4('0.0.0.0/0'),
              traffic: ec2.AclTraffic.allTraffic(),
            },
          ],
          egressNetworkACL: [
            {
              cidr: ec2.AclCidr.ipv4('0.0.0.0/0'),
              traffic: ec2.AclTraffic.allTraffic(),
            },
          ],
          routes: [
          ],
          tags: {
          },
        },
      ],
      vpcEndpoints: [
        {
          name: "s3-gw",
          service: ec2.GatewayVpcEndpointAwsService.S3,
          subnetGroupNames: ["Private","Database"],
          externalSubnets: [
            {
              id: "subnet-<id>",
              availabilityZone: "ap-south-1a",
              routeTableId: "rtb-<id>"
            },
            {
              id: "subnet-<id>",
              availabilityZone: "ap-south-1b",
              routeTableId: "rtb-<id>"
            }
          ],
          iamPolicyStatements: [s3EndpointIamPermission]
        },
        {
          name: "da-stag-monitoring-vpe",
          service: ec2.InterfaceVpcEndpointAwsService.CLOUDWATCH_MONITORING,
          subnetGroupNames: ["ManageServicePrivate"],
          iamPolicyStatements: [monitoringEndpointIamPermission],
          securityGroupRules: [
            {
              peer: ec2.Peer.ipv4("10.10.0.0/16"),
              port:  ec2.Port.tcp(443),
              description: "From Test VPC"
            }
          ],
        },
      ]
    });
  }
}
const envDef = {
  account: '<AWS-ID>',
  region: '<AWS-REGION>',
};

const app = new App();

new VPCStack(app, 'TEST', {
  env: envDef,
  terminationProtection: true,
  tags: {
});
app.synth();
```
Please refer [here](/API.md) to check how to use individual resource constructs.

## :clapper: Quick Start

The quick start shows you how to create an **AWS-VPC** using this module.

### Prerequisites

- A working [`aws`](https://aws.amazon.com/cli/) CLI installation with access to an account and administrator privileges
- You'll need a recent [NodeJS](https://nodejs.org) installation

To get going you'll need a CDK project. For details please refer to the [detailed guide for CDK](https://docs.aws.amazon.com/cdk/latest/guide/hello_world.html).

Create an empty directory on your system.

```bash
mkdir aws-quick-start-vpc && cd aws-quick-start-vpc
```

Bootstrap your CDK project, we will use TypeScript, but you can switch to any other supported language.

```bash
npx cdk init sample-vpc  --language typescript
npx cdk bootstrap 
```

Install using NPM:
```
npm install @smallcase/cdk-vpc-module
```
Using yarn
```
yarn add @smallcase/cdk-vpc-module
```

Check the changed which are to be deployed
```bash
~ -> npx cdk diff
```

Deploy using
```bash
~ -> npx cdk deploy
```


Features
Multiple VPC Endpoints: Define and manage multiple VPC Endpoints in one configuration.
Flexible Subnet Selection: Attach VPC Endpoints to multiple subnet groups or external subnets.
Custom Security Groups: Configure security groups for Interface VPC Endpoints.
IAM Policies: Attach custom IAM policies to control access to the VPC Endpoints.
Tagging: Apply custom tags to each VPC Endpoint.

Defining VPC Endpoints Configuration
You can define multiple VPC Endpoints in the vpcEndpoints: [] configuration array. Each VPC Endpoint can be customized with different subnet groups, IAM policies, security group rules, and tags.
```
vpcEndpoints: [
  {
    name: "test-s3-gw",
    service: ec2.GatewayVpcEndpointAwsService.S3,
    subnetGroupNames: ["ManageServicePrivate", "ToolPrivate", "Database"],  // Subnet groups for the endpoint
    externalSubnets: [
      {
        id: "subnet-<id>",
        availabilityZone: "ap-south-1a",
        routeTableId: "rtb-<id>",
      },
      {
        id: "subnet-<id>",
        availabilityZone: "ap-south-1b",
        routeTableId: "rtb-<id>",
      }
    ],
    iamPolicyStatements: [s3EndpointIamPermission],  // Custom IAM policy for the endpoint
  },
  {
    name: "DynamoDbGatewayEndpoint",
    service: ec2.GatewayVpcEndpointAwsService.DYNAMODB,
    subnetGroupNames: ["private-subnet"],
    additionalTags: {
      Environment: "Staging",
    },
  },
],
```
In this example:

The S3 Gateway Endpoint is created in three subnet groups: ManageServicePrivate, ToolPrivate, and Database.
External subnets are specified with their IDs, availability zones, and route table IDs for the S3 endpoint.
A custom IAM policy (s3EndpointIamPermission) is attached to control access to the S3 endpoint.
A DynamoDB Gateway Endpoint is created in the private-subnet with additional tags specifying the environment and ownership.

Configuration Options
Here’s a breakdown of the configuration options available:
1. name: A unique name for the VPC Endpoint.
2. service: The AWS service the VPC Endpoint connects to (e.g., S3, DynamoDB, Secrets Manager)
3. subnetGroupNames: The subnet group names where the VPC Endpoint will be deployed.
4. externalSubnets: Specify external subnets if you need to define subnets manually (each with an id, availabilityZone, and routeTableId).
5. iamPolicyStatements: (Optional) Attach IAM policy statements to control access to the endpoint.
6. additionalTags: (Optional) Add custom tags to the VPC Endpoint for easier identification and tracking.



- :white_check_mark: Configurable route table entry naming for subnet routes via `routeTableStringFormat`