auth: Add `/register-user` endpoint

* gn3/app.py: register top-level error handlers. reorganise oauth2 blueprint.
* gn3/auth/__init__.py: reorganise oaut2 blueprint.
* gn3/auth/authentication/oauth2/views.py: reorganise oauth2 blueprint.
* gn3/auth/authorisation/exceptions.py -> gn3/auth/authorisation/errors.py
* gn3/auth/authorisation/groups.py: rename file/module
* gn3/auth/authorisation/resources.py: rename file/module
* gn3/auth/authorisation/views.py: Add `/register-user` endpoint
* gn3/auth/blueprint.py: reorganise oauth2 blueprint.
* gn3/errors.py: register top-level error handlers.

1 files changed, 15 insertions, 0 deletions

diff --git a/gn3/errors.py b/gn3/errors.py
new file mode 100644
index 0000000..01f917e
--- /dev/null
+++ b/gn3/errors.py
@@ -0,0 +1,15 @@
+"""Handle application level errors."""
+from flask import Flask, jsonify
+
+from gn3.auth.authorisation.errors import AuthorisationError
+
+def handle_authorisation_error(exc: AuthorisationError):
+    """Handle AuthorisationError if not handled anywhere else."""
+    return jsonify({
+        "error": type(exc).__name__,
+        "error_description": " :: ".join(exc.args)
+    }), 500
+
+def register_error_handlers(app: Flask):
+    """Register application-level error handlers."""
+    app.register_error_handler(AuthorisationError, handle_authorisation_error)