Introduce check_validity method

cads_adaptors/adaptors/__init__.py

@@ -102,6 +102,27 @@ def __init__(
             pathlib.Path() if cache_tmp_path is None else cache_tmp_path
         )
 
+    @abc.abstractmethod
+    def check_validity(self, request: Request) -> None:
+        """Check the validity of the request.
+
+        Parameters
+        ----------
+        request : Request
+            Incoming request.
+
+        Returns
+        -------
+        None
+            If the request is valid.
+
+        Raises
+        ------
+        cads_adaptors.exceptions.InvalidRequest
+            If the request is invalid.
+        """
+        pass
+
     @abc.abstractmethod
     def normalise_request(self, request: Request) -> Request:
         """Apply any normalisation to the request before validation.
@@ -207,6 +228,9 @@ class DummyAdaptor(AbstractAdaptor):
     def apply_constraints(self, request: Request) -> dict[str, Any]:
         return {}
 
+    def check_validity(self, request: Request) -> None:
+        return
+
     def estimate_costs(self, request: Request, **kwargs: Any) -> dict[str, int]:
         size = int(request.get("size", 0))
         time = int(request.get("time", 0.0))

cads_adaptors/adaptors/cds.py

@@ -57,6 +57,9 @@ def retrieve(self, request: Request) -> BinaryIO:
         result = self.retrieve_list_of_results(request)
         return self.make_download_object(result)
 
+    def check_validity(self, request: Request) -> None:
+        return
+
     def apply_constraints(self, request: Request) -> dict[str, Any]:
         return constraints.validate_constraints(self.form, request, self.constraints)