Remove hardcoded AuRa release spec decorator to plugin module

src/Nethermind/Nethermind.AuRa.Test/AuRaPluginTests.cs

@@ -47,5 +47,19 @@ public void Init_when_not_AuRa_doesnt_trow()
             init.Should().NotThrow();
         }
 
+        [Test]
+        public void DecorateReleaseSpecWithAuraReleaseSpec()
+        {
+            ChainSpec chainSpec = new();
+            chainSpec.EngineChainSpecParametersProvider = new TestChainSpecParametersProvider(new AuRaChainSpecEngineParameters());
+            using IContainer container = new ContainerBuilder()
+                .AddModule(new TestNethermindModule())
+                .AddModule(new AuRaModule(chainSpec))
+                .Build();
+
+            container.Resolve<ISpecProvider>().GetSpec(Build.A.BlockHeader.WithNumber(10).TestObject)
+                .Should().BeOfType<AuRaReleaseSpecDecorator>();
+        }
+
     }
 }

src/Nethermind/Nethermind.Consensus.AuRa/AuRaPlugin.cs

@@ -92,6 +92,7 @@ protected override void Load(ContainerBuilder builder)
 
             builder
                 .AddSingleton<NethermindApi, AuRaNethermindApi>()
+                .AddDecorator<ISpecProvider, AuRaSpecProvider>()
                 .AddSingleton<AuRaChainSpecEngineParameters>(specParam)
                 .AddDecorator<IBetterPeerStrategy, AuRaBetterPeerStrategy>()
                 .Add<StartBlockProducerAuRa>() // Note: Stateful. Probably just some strange unintentional side effect though.

src/Nethermind/Nethermind.Core/Specs/AuRaSpecProvider.cs

@@ -0,0 +1,18 @@
+// SPDX-FileCopyrightText: 2024 Demerzel Solutions Limited
+// SPDX-License-Identifier: LGPL-3.0-only
+
+namespace Nethermind.Core.Specs;
+
+
+public class AuRaSpecProvider(ISpecProvider baseSpecProvider) : SpecProviderDecorator(baseSpecProvider)
+{
+    public override IReleaseSpec GetSpecInternal(ForkActivation forkActivation)
+    {
+        return new AuRaReleaseSpecDecorator(base.GetSpecInternal(forkActivation));
+    }
+}
+
+public class AuRaReleaseSpecDecorator(IReleaseSpec spec) : ReleaseSpecDecorator(spec)
+{
+    public override bool IsEip158IgnoredAccount(Address address) => address == Address.SystemUser;
+}

src/Nethermind/Nethermind.Core/Specs/ISpecProvider.cs

@@ -84,11 +84,7 @@ public interface ISpecProvider
 
     public static class SpecProviderExtensions
     {
-        public static IReleaseSpec GetSpec(this ISpecProvider specProvider, ForkActivation forkActivation)
-            => specProvider.SealEngine == SealEngineType.AuRa
-                ? new AuraSpecProvider(specProvider.GetSpecInternal(forkActivation))
-                : specProvider.GetSpecInternal(forkActivation);
-
+        public static IReleaseSpec GetSpec(this ISpecProvider specProvider, ForkActivation forkActivation) => specProvider.GetSpecInternal(forkActivation);
         public static IReleaseSpec GetSpec(this ISpecProvider specProvider, long blockNumber, ulong? timestamp) => specProvider.GetSpec(new ForkActivation(blockNumber, timestamp));
         public static IReleaseSpec GetSpec(this ISpecProvider specProvider, BlockHeader blockHeader) => specProvider.GetSpec(new ForkActivation(blockHeader.Number, blockHeader.Timestamp));
 

src/Nethermind/Nethermind.Core/Specs/SpecProviderDecorator.cs

@@ -0,0 +1,31 @@
+// SPDX-FileCopyrightText: 2025 Demerzel Solutions Limited
+// SPDX-License-Identifier: LGPL-3.0-only
+
+using Nethermind.Int256;
+
+namespace Nethermind.Core.Specs;
+
+public class SpecProviderDecorator(ISpecProvider baseSpecProvider) : ISpecProvider
+{
+    public void UpdateMergeTransitionInfo(long? blockNumber, UInt256? terminalTotalDifficulty = null) => baseSpecProvider.UpdateMergeTransitionInfo(blockNumber, terminalTotalDifficulty);
+
+    public ForkActivation? MergeBlockNumber => baseSpecProvider.MergeBlockNumber;
+
+    public ulong TimestampFork => baseSpecProvider.TimestampFork;
+
+    public UInt256? TerminalTotalDifficulty => baseSpecProvider.TerminalTotalDifficulty;
+
+    public IReleaseSpec GenesisSpec => baseSpecProvider.GenesisSpec;
+
+    public long? DaoBlockNumber => baseSpecProvider.DaoBlockNumber;
+
+    public ulong? BeaconChainGenesisTimestamp => baseSpecProvider.BeaconChainGenesisTimestamp;
+
+    public ulong NetworkId => baseSpecProvider.NetworkId;
+
+    public ulong ChainId => baseSpecProvider.ChainId;
+
+    public ForkActivation[] TransitionActivations => baseSpecProvider.TransitionActivations;
+
+    public virtual IReleaseSpec GetSpecInternal(ForkActivation forkActivation) => baseSpecProvider.GetSpecInternal(forkActivation);
+}