[#74] proxy: Allow to own NNS domains

Because `Verify` is flexible enough, any funds transferred to the proxy
contract can be moved out with the help of the committee. Thus,
implementing onNEP11Payment() is enough.

Signed-off-by: Evgenii Stratonikov <e.stratonikov@yadro.com>

proxy/proxy_contract.go

@@ -19,6 +19,15 @@ func OnNEP17Payment(from interop.Hash160, amount int, data any) {
 	}
 }
 
+// OnNEP11Payment is a callback for NEP-11 compatible NNS contract.
+func OnNEP11Payment(from interop.Hash160, amount int, token []byte, data any) {
+	caller := runtime.GetCallingScriptHash()
+	nnsHash := management.GetContractByID(1).Hash
+	if !common.BytesEqual(caller, []byte(nnsHash)) {
+		common.AbortWithMessage("proxy contract accepts NNS tokens only")
+	}
+}
+
 func _deploy(data any, isUpdate bool) {
 	if isUpdate {
 		args := data.([]any)

tests/nns_test.go

@@ -10,7 +10,10 @@ import (
 
 	"git.frostfs.info/TrueCloudLab/frostfs-contract/nns"
 	"github.com/nspcc-dev/neo-go/pkg/core/interop/storage"
+	"github.com/nspcc-dev/neo-go/pkg/core/transaction"
 	"github.com/nspcc-dev/neo-go/pkg/neotest"
+	"github.com/nspcc-dev/neo-go/pkg/rpcclient/gas"
+	"github.com/nspcc-dev/neo-go/pkg/util"
 	"github.com/nspcc-dev/neo-go/pkg/vm/stackitem"
 	"github.com/stretchr/testify/require"
 )
@@ -395,3 +398,34 @@ func TestNNSResolve(t *testing.T) {
 	c.Invoke(t, records, "resolve", "test.com.", int64(nns.TXT))
 	c.InvokeFail(t, "invalid domain name format", "resolve", "test.com..", int64(nns.TXT))
 }
+
+func TestNNSAndProxy(t *testing.T) {
+	c := newNNSInvoker(t, false)
+	proxyHash := deployProxyContract(t, c.Executor)
+	proxySigner := neotest.NewContractSigner(proxyHash, func(*transaction.Transaction) []any { return nil })
+
+	g := c.NewInvoker(gas.Hash, c.Validator)
+	g.Invoke(t, true, "transfer",
+		c.Validator.ScriptHash(), proxyHash, 100_0000_0000, nil)
+
+	cc := c.WithSigners(proxySigner, c.Committee)
+	cc.Invoke(t, true, "register", "ns", proxyHash,
+		"ops@frostfs.info", 100, 100, 100, 100)
+
+	checkBalance := func(t *testing.T, owner util.Uint160, balance int64) {
+		s, err := cc.TestInvoke(t, "balanceOf", owner)
+		require.NoError(t, err)
+		require.Equal(t, 1, s.Len())
+		require.Equal(t, int64(balance), s.Pop().BigInt().Int64())
+	}
+
+	checkBalance(t, proxyHash, 1)
+	checkBalance(t, c.CommitteeHash, 0)
+
+	t.Run("ensure domain is not lost", func(t *testing.T) {
+		cc.Invoke(t, true, "transfer", c.CommitteeHash, "ns", nil)
+
+		checkBalance(t, proxyHash, 0)
+		checkBalance(t, c.CommitteeHash, 1)
+	})
+}