✨ [#5012] Add JSON dump registration variables

src/openforms/registrations/contrib/json_dump/registration_variables.py

@@ -0,0 +1,62 @@
+from django.utils.translation import gettext_lazy as _
+
+from openforms.plugins.registry import BaseRegistry
+from openforms.submissions.models import Submission
+from openforms.typing import JSONObject
+from openforms.variables.base import BaseStaticVariable
+from openforms.variables.constants import FormVariableDataTypes
+from openforms.variables.static_variables.static_variables import Now
+
+
+class Registry(BaseRegistry[BaseStaticVariable]):
+    """
+    A registry for the JSON Dump registration variables.
+    """
+
+    module = "json_dump"
+
+
+register = Registry()
+"""The JSON Dump registration variables registry."""
+
+
+@register("public_reference")
+class PublicReference(BaseStaticVariable):
+    name = _("Public reference")
+    data_type = FormVariableDataTypes.string
+
+    def get_initial_value(self, submission: Submission | None = None) -> str:
+        if submission is None:
+            return ""
+        return submission.public_registration_reference
+
+    def as_json_schema(self) -> JSONObject:
+        return {"title": "Public reference", "type": "string"}
+
+
+@register("form_version")
+class FormVersion(BaseStaticVariable):
+    name = _("Form version")
+    data_type = FormVariableDataTypes.string
+
+    def get_initial_value(self, submission: Submission | None = None) -> str:
+        if submission is None:
+            return ""
+
+        form_version = submission.form.formversion_set.order_by("created").last()
+        return form_version.description if form_version else ""
+
+    def as_json_schema(self) -> JSONObject:
+        return {"title": "Form version", "type": "string"}
+
+
+@register("registration_timestamp")
+class RegistrationTimestamp(Now):
+    name = _("Registration timestamp")
+
+    def as_json_schema(self) -> JSONObject:
+        return {
+            "title": "Registration timestamp",
+            "type": "string",
+            "format": "date-time",
+        }