[#59] proxy: Check committee address in Verify function

For committee operations in side chain we can't use 5\7 multi
address, instead we should use 4\7 for this case.

Signed-off-by: Alex Vanin <alexey@nspcc.ru>

common/ir.go

@@ -10,6 +10,7 @@ import (
 const (
 	irListMethod    = "innerRingList"
 	multiaddrMethod = "multiaddress"
+	committeeMethod = "committee"
 )
 
 type IRNode struct {
@@ -56,3 +57,17 @@ func InnerRingMultiAddressViaStorage(ctx storage.Context, key interface{}) []byt
 func InnerRingMultiAddress(sc interop.Hash160) []byte {
 	return contract.Call(sc, multiaddrMethod, contract.ReadOnly).([]byte)
 }
+
+// CommitteeMultiAddressViaStorage returns multiaddress of committee public
+// keys by invoking netmap contract, which scripthash stored in the contract
+// storage by the key `key`.
+func CommitteeMultiAddressViaStorage(ctx storage.Context, key interface{}) []byte {
+	sc := storage.Get(ctx, key).(interop.Hash160)
+	return CommitteeMultiAddress(sc)
+}
+
+// CommitteeMultiAddress returns multiaddress of committee public keys by
+// invoking netmap contract.
+func CommitteeMultiAddress(sc interop.Hash160) []byte {
+	return contract.Call(sc, committeeMethod, contract.ReadOnly).([]byte)
+}

netmap/config.yml

@@ -1,5 +1,5 @@
 name: "NeoFS Netmap"
-safemethods: ["innerRingList", "multiaddress", "epoch", "netmap", "snapshot", "snapshotByEpoch", "config", "listConfig", "version"]
+safemethods: ["innerRingList", "multiaddress", "committee", "epoch", "netmap", "snapshot", "snapshotByEpoch", "config", "listConfig", "version"]
 events:
   - name: AddPeer
     parameters:

netmap/netmap_contract.go

@@ -103,7 +103,12 @@ func InnerRingList() []common.IRNode {
 
 func Multiaddress() []byte {
 	ctx := storage.GetReadOnlyContext()
-	return multiaddress(getIRNodes(ctx))
+	return multiaddress(getIRNodes(ctx), false)
+}
+
+func Committee() []byte {
+	ctx := storage.GetReadOnlyContext()
+	return multiaddress(getIRNodes(ctx), true)
 }
 
 func UpdateInnerRing(keys []interop.PublicKey) bool {
@@ -420,8 +425,11 @@ func setConfig(ctx storage.Context, key, val interface{}) {
 	storage.Put(ctx, storageKey, val)
 }
 
-func multiaddress(n []common.IRNode) []byte {
+func multiaddress(n []common.IRNode, committee bool) []byte {
 	threshold := len(n)/3*2 + 1
+	if committee {
+		threshold = len(n)/2 + 1
+	}
 
 	var result = []byte{0x10 + uint8(threshold)} // m value =  5
 

proxy/proxy_contract.go

@@ -57,7 +57,12 @@ func Verify() bool {
 	ctx := storage.GetReadOnlyContext()
 	sig := common.InnerRingMultiAddressViaStorage(ctx, netmapContractKey)
 
-	return runtime.CheckWitness(sig)
+	if !runtime.CheckWitness(sig) {
+		sig = common.CommitteeMultiAddressViaStorage(ctx, netmapContractKey)
+		return runtime.CheckWitness(sig)
+	}
+
+	return true
 }
 
 func Version() int {