main.tf

terraform {
  required_version = ">= 0.11"
}

locals {
  environment = "${terraform.workspace == "default" ? "test" : terraform.workspace}"
}

data "azurerm_public_ip" "appgw_pip" {
  name                = "${var.name_prefix}-app-gw-public-ip-${local.environment}"
  resource_group_name = "${var.create_new_rg == "true" ? "${element(concat(azurerm_resource_group.test.*.name, list("")), 0)}" : var.existing_rg}"
}

resource "azurerm_resource_group" "test" {
  name     = "${var.new_rg_name}"
  location = "${var.location}"
  count    = "${var.create_new_rg == "true" ? 1 : 0}"

  tags = {
    Environment = "${local.environment}"
    ManagedBy   = "TF"
  }
}

resource "azurerm_subnet" "appgw_subnet" {
  name                 = "${var.name_prefix}-appgw-subnet-${local.environment}"
  resource_group_name  = "${var.create_new_rg == "true" ? "${element(concat(azurerm_resource_group.test.*.name, list("")), 0)}" : var.existing_rg}"
  virtual_network_name = "${var.existing_vnet_name}"
  address_prefix       = "${var.app_gw_subnet_adr_prefix}"
}

resource "azurerm_public_ip" "appgw_pip" {
  name                         = "${var.name_prefix}-app-gw-public-ip-${local.environment}"
  resource_group_name          = "${var.create_new_rg == "true" ? "${element(concat(azurerm_resource_group.test.*.name, list("")), 0)}" : var.existing_rg}"
  public_ip_address_allocation = "static"
  location                     = "${var.location}"
}

resource "azurerm_application_gateway" "application_gateway" {
  name                = "${var.name_prefix}-application-gateway-${local.environment}"
  resource_group_name = "${var.create_new_rg == "true" ? "${element(concat(azurerm_resource_group.test.*.name, list("")), 0)}" : var.existing_rg}"
  location            = "${var.location}"

  sku {
    name     = "${lookup(var.appgw_available_sku_names, var.app_gw_sku_name)}"
    tier     = "${lookup(var.appgw_available_sku_tiers, var.app_gw_sku_tier)}"
    capacity = "${var.app_gw_sku_capacity}"
  }

  gateway_ip_configuration {
    name      = "${var.name_prefix}-appgw-ipconfiguration"
    subnet_id = "${var.existing_vnet_id}/subnets/${azurerm_subnet.appgw_subnet.name}"
  }

  frontend_port {
    name = "${var.existing_vnet_name}-feport"
    port = "${var.app_gw_frontend_port}"
  }

  frontend_ip_configuration {
    name                          = "${var.existing_vnet_name}-feip"
    private_ip_address_allocation = "${var.private_ip_allocation}"
    public_ip_address_id          = "${azurerm_public_ip.appgw_pip.id}"
  }

  backend_address_pool {
    name = "${var.existing_vnet_name}-beap"
  }

  backend_http_settings {
    name                  = "${var.existing_vnet_name}-be-htst"
    cookie_based_affinity = "${var.cookie_based_affinity}"
    port                  = "${var.app_gw_backend_port}"
    protocol              = "${var.app_gw_backend_protocol}"
    request_timeout       = 1
  }

  http_listener {
    name                           = "${var.existing_vnet_name}-httplstn"
    frontend_ip_configuration_name = "${var.existing_vnet_name}-feip"
    frontend_port_name             = "${var.existing_vnet_name}-feport"
    protocol                       = "${var.app_gw_backend_protocol}"
  }

  request_routing_rule {
    name                       = "${var.existing_vnet_name}-rqrt"
    rule_type                  = "Basic"
    http_listener_name         = "${var.existing_vnet_name}-httplstn"
    backend_address_pool_name  = "${var.existing_vnet_name}-beap"
    backend_http_settings_name = "${var.existing_vnet_name}-be-htst"
  }
}