fix(rivetkit-core): preserve user error metadata

Author: IGassmann

rivetkit-rust/packages/rivetkit-core/src/error.rs

@@ -4,6 +4,7 @@ use serde_json::Value as JsonValue;
 
 pub fn public_error_status_code(group: &str, code: &str) -> Option<u16> {
 	match (group, code) {
+		("user", _) => Some(400),
 		("auth", "forbidden") => Some(403),
 		("actor", "action_not_found") => Some(404),
 		("actor", "action_timed_out") => Some(408),

rivetkit-rust/packages/rivetkit-core/tests/modules/action_dispatch_error.rs

@@ -29,6 +29,31 @@ fn preserves_public_error_message_for_client_boundary() {
 	assert_eq!(error.client_message(), "action `missing` was not found");
 }
 
+#[test]
+fn preserves_user_error_metadata_for_client_boundary() {
+	let metadata = serde_json::json!({
+		"error": {
+			"_tag": "CounterOverflowError",
+			"limit": 20,
+		},
+	});
+	let error = ActionDispatchError::from_anyhow(anyhow::Error::new(RivetError {
+		kind: RivetErrorKind::Dynamic {
+			group: "user".to_owned(),
+			code: "Increment".to_owned(),
+			default_message: "count 25 would exceed limit 20".to_owned(),
+		},
+		meta: serde_json::value::to_raw_value(&metadata).ok(),
+		message: None,
+		actor: None,
+	}));
+
+	assert_eq!(error.group, "user");
+	assert_eq!(error.code, "Increment");
+	assert_eq!(error.client_message(), "count 25 would exceed limit 20");
+	assert_eq!(error.client_metadata(), Some(&metadata));
+}
+
 #[test]
 fn masks_private_structured_message_at_client_boundary() {
 	static TEST_ERROR: RivetErrorSchema = RivetErrorSchema {