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/*
* Copyright (c) 2022 Vaughn Nugent
*
* Library: VNLib
* Package: VNLib.Plugins.Essentials.SocialOauth
* File: ClientAccessTokenState.cs
*
* ClientAccessTokenState.cs is part of VNLib.Plugins.Essentials.SocialOauth which is part of the larger
* VNLib collection of libraries and utilities.
*
* VNLib.Plugins.Essentials.SocialOauth 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.SocialOauth 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 System.Text.Json.Serialization;
using VNLib.Hashing;
using VNLib.Utils.Memory;
using VNLib.Utils.Memory.Caching;
using VNLib.Plugins.Essentials.Accounts;
namespace VNLib.Plugins.Essentials.SocialOauth
{
public sealed class OAuthAccessState : IOAuthAccessState, ICacheable, INonce
{
///<inheritdoc/>
[JsonPropertyName("access_token")]
public string? Token { get; set; }
///<inheritdoc/>
[JsonPropertyName("scope")]
public string? Scope { get; set; }
///<inheritdoc/>
[JsonPropertyName("token_type")]
public string? Type { get; set; }
///<inheritdoc/>
[JsonPropertyName("refresh_token")]
public string? RefreshToken { get; set; }
///<inheritdoc/>
[JsonPropertyName("id_token")]
public string? IdToken { get; set; }
//Ignore the public key and client ids
[JsonIgnore]
internal string? PublicKey { get; set; }
[JsonIgnore]
internal string? ClientId { get; set; }
/// <summary>
/// A random nonce generated when the access state is created and
/// deleted when then access token is evicted.
/// </summary>
[JsonIgnore]
internal ReadOnlyMemory<byte> Nonce { get; private set; }
DateTime ICacheable.Expires { get; set; }
bool IEquatable<ICacheable>.Equals(ICacheable? other) => GetHashCode() == other?.GetHashCode();
public override int GetHashCode() => Token!.GetHashCode(StringComparison.Ordinal);
void ICacheable.Evicted()
{
MemoryUtil.UnsafeZeroMemory(Nonce);
}
void INonce.ComputeNonce(Span<byte> buffer)
{
//Compute nonce
RandomHash.GetRandomBytes(buffer);
//Copy and store
Nonce = buffer.ToArray();
}
bool INonce.VerifyNonce(ReadOnlySpan<byte> nonceBytes) => CryptographicOperations.FixedTimeEquals(Nonce.Span, nonceBytes);
}
}
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