init

infra/main.tf

@@ -0,0 +1,171 @@
+locals {
+  origin_id = "s3-calculator-origin"
+  bucket_name = replace(var.primary_domain, ".", "-")
+}
+
+resource "aws_s3_bucket" "site" {
+  bucket = local.bucket_name
+  tags   = var.tags
+}
+
+resource "aws_s3_bucket_ownership_controls" "site" {
+  bucket = aws_s3_bucket.site.id
+  rule { object_ownership = "BucketOwnerPreferred" }
+}
+
+resource "aws_s3_bucket_public_access_block" "site" {
+  bucket                  = aws_s3_bucket.site.id
+  block_public_acls       = true
+  block_public_policy     = true
+  ignore_public_acls      = true
+  restrict_public_buckets = true
+}
+
+resource "aws_s3_bucket_policy" "site" {
+  bucket = aws_s3_bucket.site.id
+  policy = data.aws_iam_policy_document.s3_policy.json
+}
+
+data "aws_caller_identity" "current" {}
+
+data "aws_iam_policy_document" "s3_policy" {
+  statement {
+    sid     = "AllowCloudFrontRead"
+    effect  = "Allow"
+    actions = ["s3:GetObject"]
+    resources = ["${aws_s3_bucket.site.arn}/*"]
+    principals {
+      type        = "Service"
+      identifiers = ["cloudfront.amazonaws.com"]
+    }
+    condition {
+      test     = "StringEquals"
+      variable = "AWS:SourceArn"
+      values   = [aws_cloudfront_distribution.site.arn]
+    }
+  }
+}
+
+# CloudFront OAC (origin access control)
+resource "aws_cloudfront_origin_access_control" "oac" {
+  name                              = "${local.bucket_name}-oac"
+  description                       = "OAC for ${local.bucket_name}"
+  origin_access_control_origin_type = "s3"
+  signing_behavior                  = "always"
+  signing_protocol                  = "sigv4"
+}
+
+# ACM certificate in us-east-1 for both domains
+resource "aws_acm_certificate" "cert" {
+  provider                  = aws.us_east_1
+  domain_name              = var.primary_domain
+  subject_alternative_names = [var.secondary_domain]
+  validation_method         = "DNS"
+  tags                      = var.tags
+}
+
+resource "aws_route53_record" "cert_validation" {
+  for_each = { for dvo in aws_acm_certificate.cert.domain_validation_options : dvo.domain_name => {
+    name  = dvo.resource_record_name
+    type  = dvo.resource_record_type
+    value = dvo.resource_record_value
+  } }
+  zone_id = data.aws_route53_zone.main.zone_id
+  name    = each.value.name
+  type    = each.value.type
+  ttl     = 60
+  records = [each.value.value]
+}
+
+resource "aws_acm_certificate_validation" "cert" {
+  provider                = aws.us_east_1
+  certificate_arn         = aws_acm_certificate.cert.arn
+  validation_record_fqdns = [for r in aws_route53_record.cert_validation : r.fqdn]
+}
+
+# Get the hosted zone
+data "aws_route53_zone" "main" {
+  name = var.hosted_zone
+}
+
+# CloudFront distribution
+resource "aws_cloudfront_distribution" "site" {
+  enabled             = true
+  is_ipv6_enabled     = true
+  comment             = "Calculator site for ${var.primary_domain} and ${var.secondary_domain}"
+  default_root_object = "index.html"
+  aliases             = [var.primary_domain, var.secondary_domain]
+
+  origin {
+    domain_name              = aws_s3_bucket.site.bucket_regional_domain_name
+    origin_id                = local.origin_id
+    origin_access_control_id = aws_cloudfront_origin_access_control.oac.id
+  }
+
+  default_cache_behavior {
+    allowed_methods        = ["GET", "HEAD"]
+    cached_methods         = ["GET", "HEAD"]
+    target_origin_id       = local.origin_id
+    viewer_protocol_policy = "redirect-to-https"
+    compress               = true
+    min_ttl                = 0
+    default_ttl            = 3600
+    max_ttl                = 86400
+  }
+
+  restrictions {
+    geo_restriction {
+      restriction_type = "none"
+    }
+  }
+
+  viewer_certificate {
+    acm_certificate_arn      = aws_acm_certificate_validation.cert.certificate_arn
+    ssl_support_method       = "sni-only"
+    minimum_protocol_version = "TLSv1.2_2021"
+  }
+
+  custom_error_response {
+    error_code         = 403
+    response_code      = 200
+    response_page_path = "/index.html"
+  }
+  custom_error_response {
+    error_code         = 404
+    response_code      = 200
+    response_page_path = "/index.html"
+  }
+
+  tags = var.tags
+}
+
+# Route53 alias for primary domain
+resource "aws_route53_record" "primary_alias" {
+  zone_id = data.aws_route53_zone.main.zone_id
+  name    = var.primary_domain
+  type    = "A"
+  alias {
+    name                   = aws_cloudfront_distribution.site.domain_name
+    zone_id                = aws_cloudfront_distribution.site.hosted_zone_id
+    evaluate_target_health = false
+  }
+}
+
+# Route53 alias for secondary domain
+resource "aws_route53_record" "secondary_alias" {
+  zone_id = data.aws_route53_zone.main.zone_id
+  name    = var.secondary_domain
+  type    = "A"
+  alias {
+    name                   = aws_cloudfront_distribution.site.domain_name
+    zone_id                = aws_cloudfront_distribution.site.hosted_zone_id
+    evaluate_target_health = false
+  }
+}
+
+output "bucket_name" { value = aws_s3_bucket.site.bucket }
+output "distribution_id" { value = aws_cloudfront_distribution.site.id }
+output "primary_domain" { value = var.primary_domain }
+output "secondary_domain" { value = var.secondary_domain }
+output "cloudfront_domain" { value = aws_cloudfront_distribution.site.domain_name }
+