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/*
* Copyright (c) 2024 Vaughn Nugent
*
* Library: VNLib
* Package: VNLib.Plugins.Essentials.Auth.Social
* File: ClientRequestState.cs
*
* ClientRequestState.cs is part of VNLib.Plugins.Essentials.Auth.Social which is part of the larger
* VNLib collection of libraries and utilities.
*
* VNLib.Plugins.Essentials.Auth.Social is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* VNLib.Plugins.Essentials.Auth.Social is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see https://www.gnu.org/licenses/.
*/
using System;
using System.Security.Cryptography;
using VNLib.Hashing;
using VNLib.Utils;
using VNLib.Utils.Memory;
using VNLib.Utils.Memory.Caching;
namespace VNLib.Plugins.Essentials.Auth.Social
{
internal sealed class ClientRequestState : ICacheable
{
private readonly ReadOnlyMemory<byte> _rawKey;
/// <summary>
/// The raw nonce state bytes
/// </summary>
public ReadOnlyMemory<byte> State { get; private set; }
public ClientRequestState(ReadOnlySpan<char> keyChar, int nonceBytes)
{
//Get browser id
_rawKey = Convert.FromHexString(keyChar);
RecomputeState(nonceBytes);
}
/// <summary>
/// Recomputes a nonce state and signature for the current
/// connection
/// </summary>
/// <param name="nonceBytes">The size of the nonce (in bytes) to generate</param>
public void RecomputeState(int nonceBytes)
{
//Get random nonce buffer
State = RandomHash.GetRandomBytes(nonceBytes);
}
/// <summary>
/// Computes the signature of the supplied data based on the original
/// client state for this connection
/// </summary>
/// <param name="data"></param>
/// <returns></returns>
public ERRNO ComputeSignatureForClient(ReadOnlySpan<byte> data, Span<byte> output)
{
return HMACSHA512.TryHashData(_rawKey.Span, data, output, out int count) ? count : ERRNO.E_FAIL;
}
public DateTime Expires { get; set; }
bool IEquatable<ICacheable>.Equals(ICacheable other) => ReferenceEquals(this, other);
void ICacheable.Evicted()
{
//Zero secrets on eviction
MemoryUtil.UnsafeZeroMemory(State);
MemoryUtil.UnsafeZeroMemory(_rawKey);
}
}
}
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