Task: Create a Terraform configuration to provision an AWS IAM role with attribute name set to "example" for an Amazon EKS cluster. The role's assume role policy should allow access for EKS services. Attach the AmazonEKSClusterPolicy to this role. Additionally, define an AWS EKS cluster with a name set to "example", with a subnet and attached VPC. Ensure proper dependency handling for the IAM role's policy attachment during the EKS cluster creation process. The EKS cluster's endpoint private access should be set to false, and endpoint public access set to true

Specification:
has one "aws_iam_role" 
with one "name"
with one "assume_role_policy"

has one "aws_iam_role_policy_attachment"
with one "policy_arn"
with one "role" referencing the "aws_iam_role.eks.name"

has one "aws_eks_cluster"
with one "name"
with one "version"
with one "role_arn"
with one "vpc_config" containing "endpoint_private_access", "endpoint_public_access", and "subnet_ids"


Terraform configuration (main.tf):
terraform {
  required_providers {
    aws = {
      source  = "hashicorp/aws"
      version = ">= 5.75"
    }
  }

  required_version = ">= 1.9.0"
}

provider "aws" {
  region = "us-east-1"
}

resource "aws_vpc" "main" {
  cidr_block = "10.0.0.0/16"
}

resource "aws_subnet" "private-us-east-1a" {
  vpc_id     = aws_vpc.main.id
  cidr_block = "10.0.1.0/24"
}

resource "aws_subnet" "public-us-east-1a" {
  vpc_id     = aws_vpc.main.id
  cidr_block = "10.0.2.0/24"
}

resource "aws_iam_role" "example" {
  name = "example"

  assume_role_policy = <<POLICY
{
  "Version": "2012-10-17",
  "Statement": [
    {
      "Effect": "Allow",
      "Principal": {
        "Service": "eks.amazonaws.com"
      },
      "Action": "sts:AssumeRole"
    }
  ]
}
POLICY
}

resource "aws_iam_role_policy_attachment" "eks_cluster_policy" {
  policy_arn = "arn:aws:iam::aws:policy/AmazonEKSClusterPolicy"
  role       = aws_iam_role.example.name
}

resource "aws_iam_role_policy_attachment" "eks_service_policy" {
  policy_arn = "arn:aws:iam::aws:policy/AmazonEKSServicePolicy"
  role       = aws_iam_role.example.name
}

resource "aws_eks_cluster" "eks" {
  name     = "example"
  version  = "test-version"
  role_arn = aws_iam_role.example.arn

  vpc_config {
    endpoint_private_access = false
    endpoint_public_access  = true

    subnet_ids = [
      aws_subnet.private-us-east-1a.id,
      aws_subnet.public-us-east-1a.id
    ]
  }

  depends_on = [aws_iam_role_policy_attachment.eks_cluster_policy,
                aws_iam_role_policy_attachment.eks_service_policy]
}

Validation policy (checks.rego):
package terraform.analysis

default has_aws_iam_role = false
default has_aws_iam_role_policy_attachment = false
default has_aws_eks_cluster = false

has_aws_iam_role {
    r := input.configuration.root_module.resources[_]
    r.type == "aws_iam_role"
    r.expressions.name.constant_value == "example"
    r.expressions.assume_role_policy
}

has_aws_iam_role_policy_attachment {
    r := input.configuration.root_module.resources[_]
    r.type == "aws_iam_role_policy_attachment"
    r.expressions.policy_arn.constant_value == "arn:aws:iam::aws:policy/AmazonEKSClusterPolicy"
    r.expressions.role.references != null
}

has_aws_eks_cluster {
    r := input.configuration.root_module.resources[_]
    r.type == "aws_eks_cluster"
    r.expressions.role_arn
    r.expressions.vpc_config[_].endpoint_private_access.constant_value == false
    r.expressions.vpc_config[_].endpoint_public_access.constant_value == true
    count(r.expressions.vpc_config[_].subnet_ids.references) == 4
}

valid_config {
    has_aws_iam_role
    has_aws_iam_role_policy_attachment
    has_aws_eks_cluster
}