fix: return an error when an unknown object type is passed

fixes #7785

core/coreapi/object.go

@@ -48,6 +48,8 @@ func (api *ObjectAPI) New(ctx context.Context, opts ...caopts.ObjectNewOption) (
 		n = new(dag.ProtoNode)
 	case "unixfs-dir":
 		n = ft.EmptyDirNode()
+	default:
+		return nil, fmt.Errorf("unknown node type: %s", options.Type)
 	}
 
 	err = api.dag.Add(ctx, n)

test/sharness/t0051-object.sh

@@ -223,6 +223,10 @@ test_object_cmd() {
     ipfs object stat $OUTPUT
   '
 
+  test_expect_success "'ipfs object new foo' shouldn't crash" '
+    test_expect_code 1 ipfs object new foo
+  '
+
   test_expect_success "'ipfs object links' gives the correct results" '
     echo "$EMPTY_DIR" 4 foo > expected &&
     ipfs object links "$OUTPUT" > actual &&