[Neo Plugin RPCServer] Rpc parameters. Part I

src/Plugins/RpcServer/Model/BlockHashOrIndex.cs

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+// Copyright (C) 2015-2024 The Neo Project.
+//
+// BlockHashOrIndex.cs file belongs to the neo project and is free
+// software distributed under the MIT software license, see the
+// accompanying file LICENSE in the main directory of the
+// repository or http://www.opensource.org/licenses/mit-license.php
+// for more details.
+//
+// Redistribution and use in source and binary forms with or without
+// modifications are permitted.
+
+namespace Neo.Plugins.RpcServer.Model;
+
+public class BlockHashOrIndex
+{
+    private readonly object _value;
+
+    public BlockHashOrIndex(uint index)
+    {
+        _value = index;
+    }
+
+    public BlockHashOrIndex(UInt256 hash)
+    {
+        _value = hash;
+    }
+
+    public bool IsIndex => _value is uint;
+    public bool IsHash => _value is UInt256;
+
+    public uint AsIndex()
+    {
+        if (_value is uint intValue)
+            return intValue;
+        throw new RpcException(RpcError.InvalidParams.WithData($"Value {_value} is not a valid block index"));
+    }
+
+    public UInt256 AsHash()
+    {
+        if (_value is UInt256 hash)
+            return hash;
+        throw new RpcException(RpcError.InvalidParams.WithData($"Value {_value} is not a valid block hash"));
+    }
+}

src/Plugins/RpcServer/Model/ContractHashOrId.cs

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+// Copyright (C) 2015-2024 The Neo Project.
+//
+// ContractHashOrId.cs file belongs to the neo project and is free
+// software distributed under the MIT software license, see the
+// accompanying file LICENSE in the main directory of the
+// repository or http://www.opensource.org/licenses/mit-license.php
+// for more details.
+//
+// Redistribution and use in source and binary forms with or without
+// modifications are permitted.
+
+namespace Neo.Plugins.RpcServer.Model;
+
+public class ContractHashOrId
+{
+    private readonly object _value;
+
+    public ContractHashOrId(int id)
+    {
+        _value = id;
+    }
+
+    public ContractHashOrId(UInt160 hash)
+    {
+        _value = hash;
+    }
+
+    public bool IsId => _value is int;
+    public bool IsHash => _value is UInt160;
+
+    public int AsId()
+    {
+        if (_value is int intValue)
+            return intValue;
+        throw new RpcException(RpcError.InvalidParams.WithData($"Value {_value} is not a valid contract id"));
+    }
+
+    public UInt160 AsHash()
+    {
+        if (_value is UInt160 hash)
+            return hash;
+        throw new RpcException(RpcError.InvalidParams.WithData($"Value {_value} is not a valid contract hash"));
+    }
+}

src/Plugins/RpcServer/RpcMethodWithParamsAttribute.cs

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+// Copyright (C) 2015-2024 The Neo Project.
+//
+// RpcMethodWithParamsAttribute.cs file belongs to the neo project and is free
+// software distributed under the MIT software license, see the
+// accompanying file LICENSE in the main directory of the
+// repository or http://www.opensource.org/licenses/mit-license.php
+// for more details.
+//
+// Redistribution and use in source and binary forms with or without
+// modifications are permitted.
+
+using System;
+
+namespace Neo.Plugins.RpcServer;
+
+[AttributeUsage(AttributeTargets.Method, AllowMultiple = false)]
+public class RpcMethodWithParamsAttribute : Attribute
+{
+    public string Name { get; set; }
+}