fix scope of name availability check in ASE hosted app services

azurerm/internal/services/web/resource_arm_app_service.go

@@ -192,6 +192,7 @@ func resourceArmAppService() *schema.Resource {
 
 func resourceArmAppServiceCreate(d *schema.ResourceData, meta interface{}) error {
 	client := meta.(*clients.Client).Web.AppServicesClient
+	aspClient := meta.(*clients.Client).Web.AppServicePlansClient
 	ctx, cancel := timeouts.ForCreate(meta.(*clients.Client).StopContext, d)
 	defer cancel()
 
@@ -217,6 +218,19 @@ func resourceArmAppServiceCreate(d *schema.ResourceData, meta interface{}) error
 		Name: utils.String(name),
 		Type: web.CheckNameResourceTypesMicrosoftWebsites,
 	}
+
+	appServicePlanId := d.Get("app_service_plan_id").(string)
+	aspID, err := ParseAppServicePlanID(appServicePlanId)
+	if err != nil {
+		return err
+	}
+	// Check if App Service Plan is part of ASE
+	// If so, the name needs updating to <app name>.<ASE name>.appserviceenvironment.net and FQDN setting true for name availability check
+	aspDetails, _ := aspClient.Get(ctx, aspID.ResourceGroup, aspID.Name)
+	if aspDetails.HostingEnvironmentProfile != nil {
+		availabilityRequest.Name = utils.String(fmt.Sprintf("%s.%s.appserviceenvironment.net", name, aspID.Name))
+		availabilityRequest.IsFqdn = utils.Bool(true)
+	}
 	available, err := client.CheckNameAvailability(ctx, availabilityRequest)
 	if err != nil {
 		return fmt.Errorf("Error checking if the name %q was available: %+v", name, err)
@@ -227,7 +241,6 @@ func resourceArmAppServiceCreate(d *schema.ResourceData, meta interface{}) error
 	}
 
 	location := azure.NormalizeLocation(d.Get("location").(string))
-	appServicePlanId := d.Get("app_service_plan_id").(string)
 	enabled := d.Get("enabled").(bool)
 	httpsOnly := d.Get("https_only").(bool)
 	t := d.Get("tags").(map[string]interface{})

azurerm/internal/services/web/tests/resource_arm_app_service_test.go

@@ -1670,6 +1670,24 @@ func TestAccAzureRMAppService_basicWindowsContainer(t *testing.T) {
 	})
 }
 
+func TestAccAzureRMAppService_aseScopeNameCheck(t *testing.T) {
+	data := acceptance.BuildTestData(t, "azurerm_app_service", "test")
+	resource.ParallelTest(t, resource.TestCase{
+		PreCheck:     func() { acceptance.PreCheck(t) },
+		Providers:    acceptance.SupportedProviders,
+		CheckDestroy: testCheckAzureRMAppServiceDestroy,
+		Steps: []resource.TestStep{
+			{
+				Config: testAccAzureRMAppService_inAppServiceEnvironment(data),
+				Check: resource.ComposeTestCheckFunc(
+					testCheckAzureRMAppServiceExists(data.ResourceName),
+				),
+			},
+			data.ImportStep(),
+		},
+	})
+}
+
 func testCheckAzureRMAppServiceDestroy(s *terraform.State) error {
 	client := acceptance.AzureProvider.Meta().(*clients.Client).Web.AppServicesClient
 	ctx := acceptance.AzureProvider.Meta().(*clients.Client).StopContext
@@ -4371,3 +4389,63 @@ resource "azurerm_app_service" "test" {
 }
 `, data.RandomInteger, data.Locations.Primary, data.RandomInteger, data.RandomInteger)
 }
+
+func testAccAzureRMAppService_inAppServiceEnvironment(data acceptance.TestData) string {
+	return fmt.Sprintf(`
+provider "azurerm" {
+  features {}
+}
+
+resource "azurerm_resource_group" "test" {
+  name     = "acctestRG-%d"
+  location = "%s"
+}
+
+resource "azurerm_virtual_network" "test" {
+  name                = "acctest-vnet-%d"
+  location            = azurerm_resource_group.test.location
+  resource_group_name = azurerm_resource_group.test.name
+  address_space       = ["10.0.0.0/16"]
+}
+
+resource "azurerm_subnet" "ase" {
+  name                 = "asesubnet"
+  resource_group_name  = azurerm_resource_group.test.name
+  virtual_network_name = azurerm_virtual_network.test.name
+  address_prefix       = "10.0.1.0/24"
+}
+
+resource "azurerm_subnet" "gateway" {
+  name                 = "gatewaysubnet"
+  resource_group_name  = azurerm_resource_group.test.name
+  virtual_network_name = azurerm_virtual_network.test.name
+  address_prefix       = "10.0.2.0/24"
+}
+
+resource "azurerm_app_service_environment" "test" {
+  name      = "acctest-ase-%d"
+  subnet_id = azurerm_subnet.ase.id
+}
+
+resource "azurerm_app_service_plan" "test" {
+  name                       = "acctest-ASP-%d"
+  location                   = azurerm_resource_group.test.location
+  resource_group_name        = azurerm_resource_group.test.name
+  app_service_environment_id = azurerm_app_service_environment.test.id
+
+  sku {
+    tier     = "Isolated"
+    size     = "I1"
+    capacity = 1
+  }
+}
+
+resource "azurerm_app_service" "test" {
+  name                = "acctestAS-%d"
+  location            = azurerm_resource_group.test.location
+  resource_group_name = azurerm_resource_group.test.name
+  app_service_plan_id = azurerm_app_service_plan.test.id
+}
+
+`, data.RandomInteger, data.Locations.Primary, data.RandomInteger, data.RandomInteger, data.RandomInteger, data.RandomInteger)
+}