[#174] subnet: Add `RemoveClientAdmin` method

Signed-off-by: Pavel Karpy <carpawell@nspcc.ru>

subnet/subnet_contract.go

@@ -25,6 +25,8 @@ const (
 	ErrInvalidNode = "invalid node key"
 	// ErrNodeAdmNotExist is thrown when node admin is not found.
 	ErrNodeAdmNotExist = "node admin not found"
+	// ErrClientAdmNotExist is thrown when client admin is not found.
+	ErrClientAdmNotExist = "client admin not found"
 	// ErrNodeNotExist is thrown when node is not found.
 	ErrNodeNotExist = "node not found"
 	// ErrAccessDenied is thrown when operation is denied for caller.
@@ -357,6 +359,38 @@ func AddClientAdmin(subnetID []byte, groupID []byte, adminPublicKey interop.Publ
 	putKeyInList(ctx, adminPublicKey, stKey)
 }
 
+// RemoveClientAdmin removes client administrator from the
+// specified group in the specified subnetwork.
+// Must be called by owner only.
+func RemoveClientAdmin(subnetID []byte, groupID []byte, adminPublicKey interop.PublicKey) {
+	if len(adminPublicKey) != interop.PublicKeyCompressedLen {
+		panic("removeClientAdmin: " + ErrInvalidAdmin)
+	}
+
+	ctx := storage.GetContext()
+
+	stKey := append([]byte{ownerPrefix}, subnetID...)
+
+	rawOwner := storage.Get(ctx, stKey)
+	if rawOwner == nil {
+		panic("removeClientAdmin: " + ErrSubNotExist)
+	}
+
+	owner := rawOwner.([]byte)
+	if !runtime.CheckWitness(owner) {
+		panic("removeClientAdmin: " + errCheckWitnessFailed)
+	}
+
+	stKey[0] = clientAdminPrefix
+	stKey = append(stKey, groupID...)
+
+	if !keyInList(ctx, adminPublicKey, stKey) {
+		panic("removeClientAdmin: " + ErrClientAdmNotExist)
+	}
+
+	deleteKeyFromList(ctx, adminPublicKey, stKey)
+}
+
 // Version returns version of the contract.
 func Version() int {
 	return common.Version

tests/subnet_test.go

@@ -212,6 +212,27 @@ func TestSubnet_AddClientAdmin(t *testing.T) {
 	cOwn.InvokeFail(t, method+errSeparator+"client admin has already been added", method, id, groupId, admPub)
 }
 
+func TestSubnet_RemoveClientAdmin(t *testing.T) {
+	e := newSubnetInvoker(t)
+
+	id, owner := createSubnet(t, e)
+
+	adm := e.NewAccount(t)
+	admPub, ok := vm.ParseSignatureContract(adm.Script())
+	require.True(t, ok)
+
+	const method = "removeClientAdmin"
+
+	groupId := randomBytes(8)
+
+	cOwn := e.WithSigners(owner)
+	cOwn.InvokeFail(t, method+errSeparator+subnet.ErrInvalidAdmin, method, id, groupId, admPub[1:])
+	cOwn.InvokeFail(t, method+errSeparator+subnet.ErrSubNotExist, method, []byte{0, 0, 0, 0}, groupId, admPub)
+	cOwn.InvokeFail(t, method+errSeparator+subnet.ErrClientAdmNotExist, method, id, groupId, admPub)
+	cOwn.Invoke(t, stackitem.Null{}, "addClientAdmin", id, groupId, admPub)
+	cOwn.Invoke(t, stackitem.Null{}, method, id, groupId, admPub)
+}
+
 func createSubnet(t *testing.T, e *neotest.ContractInvoker) (id []byte, owner neotest.Signer) {
 	var (
 		ok  bool