module "default_tags" {
  source             = "git@github.com:theorchard/terraform-default-tags.git//?ref=2.0.0"
  environment        = var.environment
  application_family = var.application_family
  team_name          = var.team_name
  service_name       = var.service_name
}

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

  default_tags {
    tags = module.default_tags.tags
  }
}

# Terraform backends cannot contain interpolations
terraform {
  backend "s3" {
    bucket  = "prod-songwhip-terraform-state"
    key     = "prod/gsirt/cloudtrail-logs/terraform.tfstate"
    region  = "us-east-1"
    encrypt = "true"
  }
}

data "aws_caller_identity" "current" {}

# S3 bucket for cloudtrail logs destination
module "cloudtrail_logs_s3_bucket" {
  source = "git@github.com:theorchard/terraform-s3.git//modules/s3_bucket?ref=3.12.1"

  application_family      = var.application_family
  env                     = var.environment
  bucket_name             = "${var.service_name}-cloudtrail-logs"
  custom_logging_bucket   = "${var.environment}-${var.service_name}-cloudtrail-logs"
  bucket_policy_overrides = [data.aws_iam_policy_document.cloudtrail_logs_bucket_policy_document.json]

  apply_server_side_encryption_by_default = {
    sse_algorithm = "AES256"
  }
}

# Custom policy for load balancer logs
data "aws_iam_policy_document" "cloudtrail_logs_bucket_policy_document" {
  statement {
    sid    = "AWSCloudTrailAclCheck"
    effect = "Allow"
    resources = [
      "arn:aws:s3:::${module.cloudtrail_logs_s3_bucket.s3_bucket_name_output}"
    ]
    actions = [
      "s3:GetBucketAcl"
    ]

    principals {
      type = "Service"
      identifiers = [
        "cloudtrail.amazonaws.com"
      ]
    }
  }

  statement {
    sid    = "AWSCloudTrailWrite"
    effect = "Allow"
    resources = [
      "arn:aws:s3:::${module.cloudtrail_logs_s3_bucket.s3_bucket_name_output}/AWSLogs/${data.aws_caller_identity.current.account_id}/*"
    ]
    actions = [
      "s3:PutObject"
    ]

    condition {
      test     = "StringEquals"
      variable = "s3:x-amz-acl"
      values = [
        "bucket-owner-full-control"
      ]
    }

    principals {
      type = "Service"
      identifiers = [
        "cloudtrail.amazonaws.com"
      ]
    }
  }

  statement {
    sid    = "AWSCloudTrailRedlockWrite"
    effect = "Allow"
    resources = [
      "arn:aws:s3:::${module.cloudtrail_logs_s3_bucket.s3_bucket_name_output}/redlock/AWSLogs/${data.aws_caller_identity.current.account_id}/*"
    ]
    actions = [
      "s3:PutObject"
    ]

    condition {
      test     = "StringEquals"
      variable = "s3:x-amz-acl"
      values = [
        "bucket-owner-full-control"
      ]
    }

    principals {
      type = "Service"
      identifiers = [
        "cloudtrail.amazonaws.com"
      ]
    }
  }
}