alb.tf

resource "aws_lb" "ecs" {
  count = var.alb ? 1 : 0

  load_balancer_type         = "application"
  internal                   = false
  name                       = "ecs-${var.name}"
  subnets                    = var.public_subnet_ids
  drop_invalid_header_fields = var.alb_drop_invalid_header_fields
  enable_deletion_protection = var.alb_enable_deletion_protection

  security_groups = [
    aws_security_group.alb[0].id,
  ]

  idle_timeout = var.idle_timeout

  dynamic "access_logs" {
    for_each = compact([var.lb_access_logs_bucket])

    content {
      bucket  = var.lb_access_logs_bucket
      prefix  = var.lb_access_logs_prefix
      enabled = true
    }
  }

  tags = merge(
    var.tags,
    {
      "Terraform" = true,
      "Name"      = "ecs-${var.name}"
    },
  )
}

resource "aws_lb_listener" "ecs_https" {
  count = var.alb ? 1 : 0

  load_balancer_arn = aws_lb.ecs[0].arn
  port              = "443"
  protocol          = "HTTPS"
  ssl_policy        = var.alb_ssl_policy
  certificate_arn   = var.certificate_arn

  default_action {
    type             = "forward"
    target_group_arn = aws_lb_target_group.ecs_default_https[0].arn
  }

  tags = merge(
    var.tags,
    {
      "Terraform" = true
    },
  )
}

resource "aws_lb_listener" "ecs_http_redirect" {
  count = var.alb && var.alb_http_listener ? 1 : 0

  load_balancer_arn = aws_lb.ecs[0].arn
  port              = "80"
  protocol          = "HTTP"

  default_action {
    type = "redirect"

    redirect {
      port        = "443"
      protocol    = "HTTPS"
      status_code = "HTTP_301"
    }
  }
  tags = merge(
    var.tags,
    {
      "Terraform" = true
    },
  )
}

resource "aws_lb_listener" "ecs_test_https" {
  count = var.alb && var.alb_test_listener ? 1 : 0

  load_balancer_arn = aws_lb.ecs[0].arn
  port              = "8443"
  protocol          = "HTTPS"
  ssl_policy        = var.alb_ssl_policy
  certificate_arn   = var.certificate_arn

  default_action {
    type = "forward"
    #target_group_arn = aws_lb_target_group.ecs_replacement_https[0].arn
    target_group_arn = aws_lb_target_group.ecs_default_https[0].arn
  }
  tags = merge(
    var.tags,
    {
      "Terraform" = true
    },
  )
}

resource "aws_lb_listener" "ecs_test_http_redirect" {
  count = var.alb && var.alb_http_listener && var.alb_test_listener ? 1 : 0

  load_balancer_arn = aws_lb.ecs[0].arn
  port              = "8080"
  protocol          = "HTTP"

  default_action {
    type = "redirect"

    redirect {
      port        = "8443"
      protocol    = "HTTPS"
      status_code = "HTTP_301"
    }
  }
  tags = merge(
    var.tags,
    {
      "Terraform" = true
    },
  )
}

# Generate a random string to add it to the name of the Target Group
resource "random_string" "alb_prefix" {
  length  = 4
  upper   = false
  special = false
}

resource "aws_lb_target_group" "ecs_default_http" {
  count = var.alb && var.alb_http_listener ? 1 : 0

  name     = replace(substr("ecs-${var.name}-default-http-${random_string.alb_prefix.result}", 0, 32), "/-+$/", "")
  port     = 80
  protocol = "HTTP"
  vpc_id   = var.vpc_id

  tags = merge(
    var.tags,
    {
      "Terraform" = true
    },
  )

  lifecycle {
    create_before_destroy = true
  }
}

resource "aws_lb_target_group" "ecs_default_https" {
  count = var.alb ? 1 : 0

  name     = replace(substr("ecs-${var.name}-default-https-${random_string.alb_prefix.result}", 0, 32), "/-+$/", "")
  port     = 80
  protocol = "HTTP"
  vpc_id   = var.vpc_id

  tags = merge(
    var.tags,
    {
      "Terraform" = true
    },
  )

  lifecycle {
    create_before_destroy = true
  }
}