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/*
* Copyright (c) 2024 Vaughn Nugent
*
* Library: VNLib
* Package: VNLib.Plugins.Essentials.Auth.Social
* File: ClientClaimManager.cs
*
* ClientClaimManager.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.Diagnostics.CodeAnalysis;
using VNLib.Hashing;
using VNLib.Hashing.IdentityUtility;
using VNLib.Utils;
using VNLib.Utils.Memory;
using VNLib.Plugins.Essentials.Accounts;
using VNLib.Plugins.Essentials.Extensions;
namespace VNLib.Plugins.Essentials.Auth.Social
{
internal sealed record class ClientClaimManager(ICookieController Cookies, string Path)
{
const string SESSION_SIG_KEY_NAME = "soa.sig";
const int SIGNING_KEY_SIZE = 32;
public bool VerifyAndGetClaim(HttpEntity entity, [NotNullWhen(true)] out LoginClaim? claim)
{
claim = null;
string? cookieValue = Cookies.GetCookie(entity);
//Try to get the cookie
if (cookieValue == null)
{
return false;
}
//Recover the signing key from the user's session
string sigKey = entity.Session[SESSION_SIG_KEY_NAME];
Span<byte> key = stackalloc byte[SIGNING_KEY_SIZE + 16];
ERRNO keySize = VnEncoding.Base64UrlDecode(sigKey, key);
if (keySize < 1)
{
return false;
}
try
{
//Try to parse the jwt
using JsonWebToken jwt = JsonWebToken.Parse(cookieValue);
//Verify the jwt
if (!jwt.Verify(key[..(int)keySize], HashAlg.SHA256))
{
return false;
}
//Recover the clam from the jwt
claim = jwt.GetPayload<LoginClaim>(Statics.SR_OPTIONS)!;
//Verify the expiration time and path incase the wrong endpoint was called
return string.Equals(claim.Path, Path, StringComparison.OrdinalIgnoreCase)
&& claim.ExpirationSeconds > entity.RequestedTimeUtc.ToUnixTimeSeconds();
}
catch (FormatException)
{
//JWT was corrupted and could not be parsed
return false;
}
finally
{
MemoryUtil.InitializeBlock(key);
}
}
public void ClearClaimData(HttpEntity entity)
{
//Remove the upgrade cookie
Cookies.ExpireCookie(entity, false);
//Clear the signing key from the session
entity.Session[SESSION_SIG_KEY_NAME] = null!;
}
public void SignAndSetCookie(HttpEntity entity, LoginClaim claim)
{
//Setup Jwt
using JsonWebToken jwt = new();
//Set the claim's path to verify later
claim.Path = Path;
//Write claim body, we dont need a header
jwt.WritePayload(claim, Statics.SR_OPTIONS);
//Generate signing key
byte[] sigKey = RandomHash.GetRandomBytes(SIGNING_KEY_SIZE);
//Sign the jwt
jwt.Sign(sigKey, HashAlg.SHA256);
Cookies.SetCookie(entity, jwt.Compile());
//Encode and store the signing key in the clien't session
entity.Session[SESSION_SIG_KEY_NAME] = VnEncoding.ToBase64UrlSafeString(sigKey, false);
//Clear the signing key
MemoryUtil.InitializeBlock(sigKey);
}
}
}
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