misc: add converters (#52226)

To simplify url patterns.

src/authentic2/app.py

@@ -28,3 +28,8 @@ class Authentic2Config(AppConfig):
     def ready(self):
         plugins.init()
         debug.HIDDEN_SETTINGS = re.compile('API|TOKEN|KEY|SECRET|PASS|PROFANITIES_LIST|SIGNATURE|LDAP')
+
+        # register convertes
+        from authentic2.utils.converters import register_converters
+
+        register_converters()

src/authentic2/utils/converters.py

@@ -0,0 +1,19 @@
+# Authentic2 © Entr'ouvert
+
+from django.urls.converters import SlugConverter, register_converter
+
+
+class ObjectUUID:
+    regex = r'[0-9a-f]{32}'
+
+    def to_python(self, value):
+        return value.replace('-', '')
+
+    def to_url(self, value):
+        return str(value)
+
+
+def register_converters():
+    register_converter(ObjectUUID, 'a2_uuid')
+    # legacy, some instances have non UUID like string as User.uuid
+    register_converter(SlugConverter, 'user_uuid')