[App Service] az webapp create: Include regional site name availability check for DNL site creations (#32184)

Author: nineela

src/azure-cli/azure/cli/command_modules/appservice/_create_util.py

@@ -335,6 +335,25 @@ def get_site_availability(cmd, name):
     return availability
 
 
+def get_regional_site_availability(cmd, location, name, resource_group_name, auto_generated_domain_name_label_scope):
+    """ This is used by az webapp up to verify if a site needs to be created or should just be deployed
+      (regional check)"""
+    client = web_client_factory(cmd.cli_ctx)
+    availability = client.regional_check_name_availability(location,
+                                                           name,
+                                                           "Site",
+                                                           resource_group_name,
+                                                           auto_generated_domain_name_label_scope)
+
+    # check for "." in app name. it is valid for hostnames to contain it, but not allowed for webapp names
+    if "." in name:
+        availability.name_available = False
+        availability.reason = "Invalid"
+        availability.message = ("Site names only allow alphanumeric characters and hyphens, "
+                                "cannot start or end in a hyphen, and must be less than 64 chars.")
+    return availability
+
+
 def get_app_details(cmd, name):
     client = web_client_factory(cmd.cli_ctx)
     data = (list(filter(lambda x: name.lower() == x.name.lower(), client.web_apps.list())))

src/azure-cli/azure/cli/command_modules/appservice/custom.py

@@ -76,7 +76,8 @@
                     _remove_list_duplicates, get_raw_functionapp,
                     register_app_provider)
 from ._create_util import (zip_contents_from_dir, get_runtime_version_details, create_resource_group, get_app_details,
-                           check_resource_group_exists, set_location, get_site_availability, get_profile_username,
+                           check_resource_group_exists, set_location, get_site_availability,
+                           get_regional_site_availability, get_profile_username,
                            get_plan_to_use, get_lang_from_content, get_rg_to_use, get_sku_to_use,
                            detect_os_from_src, get_current_stack_from_runtime, generate_default_app_name,
                            get_or_create_default_workspace, get_or_create_default_resource_group,
@@ -168,7 +169,15 @@ def create_webapp(cmd, resource_group_name, name, plan, runtime=None, startup_fi
     helper = _StackRuntimeHelper(cmd, linux=is_linux, windows=not is_linux)
     location = plan_info.location
     # This is to keep the existing appsettings for a newly created webapp on existing webapp name.
-    name_validation = get_site_availability(cmd, name)
+    if auto_generated_domain_name_label_scope:
+        name_validation = get_regional_site_availability(cmd,
+                                                         location,
+                                                         name,
+                                                         resource_group_name,
+                                                         auto_generated_domain_name_label_scope)
+    else:
+        name_validation = get_site_availability(cmd, name)
+
     if not name_validation.name_available:
         if name_validation.reason == 'Invalid':
             raise ValidationError(name_validation.message)