[#556] innerring/neofs: Process Bind/Unbind events

Make IR processor of NeoFS contract to handle `Bind`/`Unbind` notification
events. The processor verifies the format of wallet script hash and public
keys, and call NeoFS ID client wrapper in order to approve adding/removing
keys from NeoFS account.

Signed-off-by: Leonard Lyubich <leonard@nspcc.ru>

pkg/innerring/processors/neofs/process_bind.go

@@ -0,0 +1,110 @@
+package neofs
+
+import (
+	"crypto/elliptic"
+	"fmt"
+
+	"github.com/mr-tron/base58"
+	"github.com/nspcc-dev/neo-go/pkg/crypto/keys"
+	"github.com/nspcc-dev/neo-go/pkg/encoding/address"
+	"github.com/nspcc-dev/neo-go/pkg/util"
+	"github.com/nspcc-dev/neofs-node/pkg/morph/event/neofs"
+	"go.uber.org/zap"
+)
+
+type bindCommon interface {
+	User() []byte
+	Keys() [][]byte
+}
+
+func (np *Processor) processBind(e bindCommon) {
+	if !np.alphabetState.IsAlphabet() {
+		np.log.Info("non alphabet mode, ignore bind")
+		return
+	}
+
+	c := &bindCommonContext{
+		bindCommon: e,
+	}
+
+	_, c.bind = e.(neofs.Bind)
+
+	err := np.checkBindCommon(c)
+	if err != nil {
+		np.log.Error("invalid manage key event",
+			zap.Bool("bind", c.bind),
+			zap.String("error", err.Error()),
+		)
+
+		return
+	}
+
+	np.approveBindCommon(c)
+}
+
+type bindCommonContext struct {
+	bindCommon
+
+	bind bool
+
+	scriptHash util.Uint160
+}
+
+func (np *Processor) checkBindCommon(e *bindCommonContext) error {
+	var err error
+
+	e.scriptHash, err = util.Uint160DecodeBytesBE(e.User())
+	if err != nil {
+		return err
+	}
+
+	curve := elliptic.P256()
+
+	for _, key := range e.Keys() {
+		_, err = keys.NewPublicKeyFromBytes(key, curve)
+		if err != nil {
+			return err
+		}
+	}
+
+	return nil
+}
+
+func (np *Processor) approveBindCommon(e *bindCommonContext) {
+	// calculate wallet address
+	// TODO: implement some utilities in API Go lib to do it
+	scriptHash := e.User()
+
+	u160, err := util.Uint160DecodeBytesBE(scriptHash)
+	if err != nil {
+		np.log.Error("could not decode script hash from bytes",
+			zap.String("error", err.Error()),
+		)
+
+		return
+	}
+
+	wallet, err := base58.Decode(address.Uint160ToString(u160))
+	if err != nil {
+		np.log.Error("could not decode wallet address",
+			zap.String("error", err.Error()),
+		)
+
+		return
+	}
+
+	err = np.neofsIDClient.ManageKeys(wallet, e.Keys(), e.bind)
+	if err != nil {
+		var typ string
+
+		if e.bind {
+			typ = "bind"
+		} else {
+			typ = "unbind"
+		}
+
+		np.log.Error(fmt.Sprintf("could not approve %s", typ),
+			zap.String("error", err.Error()),
+		)
+	}
+}