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/*
* Copyright (c) 2024 Vaughn Nugent
*
* Library: VNLib
* Package: VNLib.Plugins.Essentials.Sessions.OAuth
* File: AccessTokenEndpoint.cs
*
* AccessTokenEndpoint.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.Threading.Tasks;
using VNLib.Utils.Memory;
using VNLib.Plugins.Essentials;
using VNLib.Plugins.Essentials.Oauth;
using VNLib.Plugins.Essentials.Endpoints;
using VNLib.Plugins.Essentials.Oauth.Tokens;
using VNLib.Plugins.Essentials.Oauth.Applications;
using VNLib.Plugins.Essentials.Extensions;
using VNLib.Plugins.Extensions.Loading;
using VNLib.Plugins.Extensions.Loading.Sql;
using VNLib.Plugins.Extensions.Validation;
namespace VNLib.Plugins.Sessions.OAuth.Endpoints
{
/// <summary>
/// Grants authorization to OAuth2 clients to protected resources
/// with access tokens
/// </summary>
internal sealed class AccessTokenEndpoint : ResourceEndpointBase
{
private readonly IApplicationTokenFactory TokenFactory;
private readonly ApplicationStore Applications;
//override protection settings to allow most connections to authenticate
///<inheritdoc/>
protected override ProtectionSettings EndpointProtectionSettings { get; } = new()
{
DisableSessionsRequired = true
};
public AccessTokenEndpoint(PluginBase plugin, IConfigScope config, IApplicationTokenFactory tokenFactory)
{
InitPathAndLog(
path: config.GetRequiredProperty<string>("token_path"),
log: plugin.Log.CreateScope("Token Endpoint")
);
TokenFactory = tokenFactory;
Applications = new(
plugin.GetContextOptions(),
plugin.GetOrCreateSingleton<ManagedPasswordHashing>()
);
}
protected override async ValueTask<VfReturnType> PostAsync(HttpEntity entity)
{
//Check for refresh token
if (entity.RequestArgs.IsArgumentSet("grant_type", "refresh_token"))
{
//process a refresh token
}
//Check for grant_type parameter from the request body
else if (entity.RequestArgs.IsArgumentSet("grant_type", "client_credentials"))
{
//Get client id and secret (and make sure theyre not empty
if (entity.RequestArgs.TryGetNonEmptyValue("client_id", out string? clientId) &&
entity.RequestArgs.TryGetNonEmptyValue("client_secret", out string? secret))
{
if (!ValidatorExtensions.OnlyAlphaNumRegx.IsMatch(clientId))
{
//respond with error message
entity.CloseResponseError(HttpStatusCode.UnprocessableEntity, ErrorType.InvalidRequest, "Invalid client_id");
return VfReturnType.VirtualSkip;
}
if (!ValidatorExtensions.OnlyAlphaNumRegx.IsMatch(secret))
{
//respond with error message
entity.CloseResponseError(HttpStatusCode.UnprocessableEntity, ErrorType.InvalidRequest, "Invalid client_secret");
return VfReturnType.VirtualSkip;
}
//Convert the clientid and secret to lowercase
clientId = clientId.ToLower(null);
secret = secret.ToLower(null);
//Convert secret to private string that is unreferrenced
using PrivateString secretPv = PrivateString.ToPrivateString(secret, false)!;
//Get the application from apps store
UserApplication? app = await Applications.VerifyAppAsync(clientId, secretPv, entity.EventCancellation);
return await GenerateTokenAsync(entity, app);
}
}
//Default to bad request
entity.CloseResponseError(HttpStatusCode.BadRequest, ErrorType.InvalidClient, "Invalid grant type");
return VfReturnType.VirtualSkip;
}
private async Task<VfReturnType> GenerateTokenAsync(HttpEntity entity, UserApplication? app)
{
if (app is null)
{
//App was not found or the credentials do not match
entity.CloseResponseError(
HttpStatusCode.UnprocessableEntity,
ErrorType.InvalidClient,
description: "The credentials are invalid or do not exist"
);
return VfReturnType.VirtualSkip;
}
IOAuth2TokenResult? result = await TokenFactory.CreateAccessTokenAsync(entity, app, entity.EventCancellation);
if (result is null)
{
entity.CloseResponseError(
HttpStatusCode.TooManyRequests,
ErrorType.TemporarilyUnavailable,
description: "You have reached the maximum number of valid tokens for this application"
);
return VfReturnType.VirtualSkip;
}
//Create the new response message
OauthTokenResponseMessage tokenMessage = new()
{
//set expired as seconds in int form
Expires = result.ExpiresSeconds,
AccessToken = result.AccessToken,
IdToken = result.IdentityToken,
RefreshToken = result.RefreshToken,
TokenType = result.TokenType
};
//Respond with the token message
entity.CloseResponseJson(HttpStatusCode.OK, tokenMessage);
return VfReturnType.VirtualSkip;
}
}
}
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