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/*
* Copyright (c) 2024 Vaughn Nugent
*
* Library: VNLib
* Package: VNLib.Plugins.Essentials.Sessions.OAuth
* File: OAuth2TokenFactory.cs
*
* OAuth2TokenFactory.cs is part of VNLib.Plugins.Essentials.Sessions.OAuth which is part of the larger
* VNLib collection of libraries and utilities.
*
* VNLib.Plugins.Essentials.Sessions.OAuth 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.Sessions.OAuth 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.Net;
using System.Diagnostics.CodeAnalysis;
using VNLib.Hashing;
using VNLib.Net.Http;
using VNLib.Plugins.Sessions.Cache.Client;
using VNLib.Plugins.Extensions.Loading;
namespace VNLib.Plugins.Sessions.OAuth
{
[ConfigurationName(OAuth2SessionProvider.OAUTH2_CONFIG_KEY)]
internal sealed class OAuth2TokenFactory(PluginBase plugin, IConfigScope config)
: ISessionIdFactory, IOauthSessionIdFactory
{
private readonly OAuth2SessionConfig _config = config.DeserialzeAndValidate<OAuth2SessionConfig>();
/*
* ID Regeneration is always false as OAuth2 sessions
* do not allow dynamic ID updates, they require a
* negotiation
*/
bool ISessionIdFactory.RegenerationSupported => false;
/*
* Connections that do not identify themselves, via a token are
* not valid. ID/Tokens must be created at once during
* authentication stage.
*/
bool ISessionIdFactory.RegenIdOnEmptyEntry => false;
///<inheritdoc/>
int IOauthSessionIdFactory.MaxTokensPerApp => _config.MaxTokensPerApp;
///<inheritdoc/>
TimeSpan IOauthSessionIdFactory.SessionValidFor => TimeSpan.FromSeconds(_config.TokenLifeTimeSeconds);
///<inheritdoc/>
string IOauthSessionIdFactory.TokenType => _config.TokenType;
///<inheritdoc/>
bool ISessionIdFactory.CanService(IHttpEvent entity) => HasBearerToken(entity.Server, out _);
///<inheritdoc/>
public GetTokenResult GenerateTokensAndId()
{
//Token is the raw value
string token = RandomHash.GetRandomBase64(_config.AccessTokenSize);
//Return sessid result
return new(token, null);
}
string ISessionIdFactory.RegenerateId(IHttpEvent entity)
{
throw new NotSupportedException("Id regeneration is not supported for OAuth2 sessions");
}
string? ISessionIdFactory.TryGetSessionId(IHttpEvent entity)
{
return HasBearerToken(entity.Server, out string ? token) ? token : null;
}
/// <summary>
/// Gets the bearer token from an authorization header
/// </summary>
/// <param name="ci"></param>
/// <param name="token">The token stored in the user's authorization header</param>
/// <returns>True if the authorization header was set, has a Bearer token value</returns>
private bool HasBearerToken(IConnectionInfo ci, [NotNullWhen(true)] out string? token)
{
//Get auth header value
string? authorization = ci.Headers[HttpRequestHeader.Authorization];
//Check if its set
if (!string.IsNullOrWhiteSpace(authorization))
{
int bearerIndex = authorization.IndexOf(_config.TokenType, StringComparison.OrdinalIgnoreCase);
//Calc token offset, get token, and trim any whitespace
token = authorization.AsSpan(bearerIndex + _config.TokenType.Length).Trim().ToString();
return true;
}
token = null;
return false;
}
}
}
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