feat(machine): add validation for machine names to accept only DNS labels

internal/machine/machine_test.go

@@ -0,0 +1,38 @@
+package machine
+
+import (
+	"context"
+	"testing"
+
+	"github.com/psviderski/uncloud/api/pb"
+	"github.com/stretchr/testify/require"
+	"google.golang.org/grpc/codes"
+	"google.golang.org/grpc/status"
+)
+
+func TestInitCluster_InvalidMachineName(t *testing.T) {
+	t.Parallel()
+
+	for _, name := range []string{"VPS1", "rr", "nearest", "c337f00600de51ef4375c9a9a267dba5"} {
+		// Invalid names must be rejected before initializing cluster state.
+		m := &Machine{state: &State{}}
+
+		resp, err := m.InitCluster(context.Background(), &pb.InitClusterRequest{MachineName: name})
+		require.Nil(t, resp)
+		require.Equal(t, codes.InvalidArgument, status.Code(err))
+		require.ErrorContains(t, err, "invalid machine name")
+	}
+}
+
+func TestUpdateMachine_InvalidName(t *testing.T) {
+	t.Parallel()
+
+	for _, name := range []string{"", "VPS1", "worker.example", "rr", "nearest", "c337f00600de51ef4375c9a9a267dba5"} {
+		m := &Machine{state: &State{ID: "machine-id", Name: "worker"}}
+		resp, err := m.UpdateMachine(context.Background(), &pb.UpdateMachineRequest{Name: &name})
+		require.Nil(t, resp)
+		require.Equal(t, codes.InvalidArgument, status.Code(err))
+		require.ErrorContains(t, err, "invalid machine name")
+		require.Equal(t, "worker", m.state.Name)
+	}
+}