interface: allow hyphens in interface_name

Allow hyphens in interface_name. Both the top level domain and the last
domain component must not contain hyphens.

Fix #7

Signed-off-by: Mattia Mazzucato <mattia.mazzucato@ispirata.com>

CHANGELOG.md

@@ -7,6 +7,8 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 ## [0.11.0-beta.2] - Unreleased
 ### Changed
 - Restrict the use of `*` as `interface_name` only to `incoming_data` data triggers.
+- Allow hyphens in `interface_name`. Both the top level domain and the last domain component
+  must not contain hyphens. ([#7](https://github.com/astarte-platform/astarte_core/issues/7))
 
 ### Fixed
 - Handle empty `bson_value` in `Triggers.SimpleEvents.Encoder`, avoiding crashes when an empty bson

lib/astarte_core/interface.ex

@@ -94,7 +94,7 @@ defmodule Astarte.Core.Interface do
   end
 
   def interface_name_regex do
-    ~r/^[a-zA-Z]+(\.[a-zA-Z0-9]+)*$/
+    ~r/^([a-zA-Z][a-zA-Z0-9]*\.([a-zA-Z0-9][a-zA-Z0-9-]*\.)*)?[a-zA-Z][a-zA-Z0-9]*$/
   end
 
   defp handle_legacy_ownership(changeset) do