Implement task API with input validation; implement error handling; refactoring

tofu_api/common/rest/base_method_view.py

@@ -0,0 +1,32 @@
+from typing import Any
+
+import flask
+from flask.typing import RouteCallable
+from flask.views import MethodView
+from validataclass.validators import Validator
+
+
+class BaseMethodView(MethodView):
+    """
+    Base class for REST API views.
+    """
+
+    @property
+    def request(self) -> flask.Request:
+        return flask.request
+
+    @classmethod
+    def as_view(cls, *args, **kwargs) -> RouteCallable:
+        return super().as_view(cls.__name__, *args, **kwargs)
+
+    @staticmethod
+    def empty_response(code: int = 204) -> tuple[str, int]:
+        return '', code
+
+    def validate_request_data(self, validator: Validator) -> Any:
+        """
+        Parses request data as JSON and validates it using a validataclass validator.
+        """
+        # TODO error handling: wrong content type; empty body; invalid json; validation errors
+        parsed_json = self.request.json
+        return validator.validate(parsed_json)