GetTransaction signers

src/neo/Network/P2P/Payloads/Signer.cs

@@ -12,6 +12,8 @@
 using Neo.IO;
 using Neo.IO.Json;
 using Neo.Network.P2P.Payloads.Conditions;
+using Neo.SmartContract;
+using Neo.VM;
 using System;
 using System.Collections.Generic;
 using System.IO;
@@ -22,7 +24,7 @@ namespace Neo.Network.P2P.Payloads
     /// <summary>
     /// Represents a signer of a <see cref="Transaction"/>.
     /// </summary>
-    public class Signer : ISerializable
+    public class Signer : ISerializable, IInteroperable
     {
         // This limits maximum number of AllowedContracts or AllowedGroups here
         private const int MaxSubitems = 16;
@@ -176,5 +178,27 @@ public JObject ToJson()
                 json["rules"] = Rules.Select(p => p.ToJson()).ToArray();
             return json;
         }
+
+        void IInteroperable.FromStackItem(VM.Types.StackItem stackItem)
+        {
+            throw new NotSupportedException();
+        }
+
+        public VM.Types.StackItem ToStackItem(ReferenceCounter referenceCounter)
+        {
+            return new VM.Types.Array(referenceCounter, new VM.Types.StackItem[]
+            {
+                Account.ToArray(),
+                (int)Scopes,
+                new VM.Types.Array(AllowedContracts.Select(u => new VM.Types.ByteString(u.ToArray()))),
+                new VM.Types.Array(AllowedGroups.Select(u => new VM.Types.ByteString(u.ToArray()))),
+                new VM.Types.Array(Rules.Select(u =>
+                    new VM.Types.Array(new VM.Types.StackItem []{
+                        new VM.Types.Integer((byte)u.Action),
+                        new VM.Types.ByteString(u.Condition.ToArray())
+                    }))),
+                this.ToArray(),
+            });
+        }
     }
 }

src/neo/SmartContract/Native/LedgerContract.cs

@@ -234,6 +234,17 @@ public Transaction GetTransaction(DataCache snapshot, UInt256 hash)
             return GetTransactionState(snapshot, hash)?.Transaction;
         }
 
+        /// <summary>
+        /// Gets a transaction signers with the specified hash.
+        /// </summary>
+        /// <param name="snapshot">The snapshot used to read data.</param>
+        /// <param name="hash">The hash of the transaction.</param>
+        /// <returns>The transaction signers with the specified hash.</returns>
+        public Signer[] GetTransactionSigners(DataCache snapshot, UInt256 hash)
+        {
+            return GetTransactionState(snapshot, hash)?.Transaction?.Signers;
+        }
+
         [ContractMethod(CpuFee = 1 << 15, RequiredCallFlags = CallFlags.ReadStates, Name = "getTransaction")]
         private Transaction GetTransactionForContract(ApplicationEngine engine, UInt256 hash)
         {