[#11] Rename neofs contract to frostfs

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

pkg/morph/event/frostfs/withdraw.go

@@ -0,0 +1,68 @@
+package frostfs
+
+import (
+	"fmt"
+
+	"github.com/TrueCloudLab/frostfs-node/pkg/morph/client"
+	"github.com/TrueCloudLab/frostfs-node/pkg/morph/event"
+	"github.com/nspcc-dev/neo-go/pkg/core/state"
+	"github.com/nspcc-dev/neo-go/pkg/util"
+)
+
+// Withdraw structure of frostfs.Withdraw notification from mainnet chain.
+type Withdraw struct {
+	id     []byte
+	amount int64 // Fixed8
+	user   util.Uint160
+}
+
+// MorphEvent implements Neo:Morph Event interface.
+func (Withdraw) MorphEvent() {}
+
+// ID is a withdraw transaction hash.
+func (w Withdraw) ID() []byte { return w.id }
+
+// User returns withdraw receiver script hash from main net.
+func (w Withdraw) User() util.Uint160 { return w.user }
+
+// Amount of the withdraw assets.
+func (w Withdraw) Amount() int64 { return w.amount }
+
+// ParseWithdraw notification into withdraw structure.
+func ParseWithdraw(e *state.ContainedNotificationEvent) (event.Event, error) {
+	var ev Withdraw
+
+	params, err := event.ParseStackArray(e)
+	if err != nil {
+		return nil, fmt.Errorf("could not parse stack items from notify event: %w", err)
+	}
+
+	if ln := len(params); ln != 3 {
+		return nil, event.WrongNumberOfParameters(3, ln)
+	}
+
+	// parse user
+	user, err := client.BytesFromStackItem(params[0])
+	if err != nil {
+		return nil, fmt.Errorf("could not get withdraw user: %w", err)
+	}
+
+	ev.user, err = util.Uint160DecodeBytesBE(user)
+	if err != nil {
+		return nil, fmt.Errorf("could not convert withdraw user to uint160: %w", err)
+	}
+
+	// parse amount
+	ev.amount, err = client.IntFromStackItem(params[1])
+	if err != nil {
+		return nil, fmt.Errorf("could not get withdraw amount: %w", err)
+	}
+
+	// parse id
+	ev.id, err = client.BytesFromStackItem(params[2])
+	if err != nil {
+		return nil, fmt.Errorf("could not get withdraw id: %w", err)
+	}
+
+	return ev, nil
+}