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/*
* Copyright (c) 2022 Vaughn Nugent
*
* Library: VNLib
* Package: SessionCacheServer
* File: BrokerHeartBeat.cs
*
* BrokerHeartBeat.cs is part of SessionCacheServer which is part of the larger
* VNLib collection of libraries and utilities.
*
* SessionCacheServer is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published
* by the Free Software Foundation, either version 2 of the License,
* or (at your option) any later version.
*
* SessionCacheServer 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
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with SessionCacheServer. If not, see http://www.gnu.org/licenses/.
*/
using System;
using System.Net;
using System.Linq;
using System.Text.Json;
using System.Threading;
using System.Threading.Tasks;
using System.Collections.Generic;
using System.Security.Cryptography;
using VNLib.Data.Caching.Extensions;
using VNLib.Hashing.IdentityUtility;
using VNLib.Plugins.Essentials.Endpoints;
using VNLib.Plugins.Essentials.Extensions;
using VNLib.Plugins.Extensions.Loading;
namespace VNLib.Plugins.Essentials.Sessions.Server.Endpoints
{
internal class BrokerHeartBeat : ResourceEndpointBase
{
public override string Path => "/heartbeat";
private readonly Func<string> Token;
private readonly ManualResetEvent KeepaliveSet;
private readonly Task<IPAddress[]> BrokerIpList;
private readonly PluginBase Pbase;
protected override ProtectionSettings EndpointProtectionSettings { get; }
public BrokerHeartBeat(Func<string> token, ManualResetEvent keepaliveSet, Uri brokerUri, PluginBase pbase)
{
Token = token;
KeepaliveSet = keepaliveSet;
BrokerIpList = Dns.GetHostAddressesAsync(brokerUri.DnsSafeHost);
this.Pbase = pbase;
EndpointProtectionSettings = new()
{
BrowsersOnly = false,
SessionsRequired = false,
VerifySessionCors = false,
};
}
private async Task<byte[]> GetBrokerPubAsync()
{
string? brokerPubKey = await Pbase.TryGetSecretAsync("broker_public_key") ?? throw new KeyNotFoundException("Missing required secret : broker_public_key");
return Convert.FromBase64String(brokerPubKey);
}
protected override async ValueTask<VfReturnType> GetAsync(HttpEntity entity)
{
//If-not loopback then verify server address
if (!entity.Server.IsLoopBack())
{
//Load and verify the broker's ip address matches with an address we have stored
IPAddress[] addresses = await BrokerIpList;
if (!addresses.Contains(entity.TrustedRemoteIp))
{
//Token invalid
entity.CloseResponse(HttpStatusCode.Forbidden);
return VfReturnType.VirtualSkip;
}
}
//Get the authorization jwt
string? jwtAuth = entity.Server.Headers[HttpRequestHeader.Authorization];
if (string.IsNullOrWhiteSpace(jwtAuth))
{
//Token invalid
entity.CloseResponse(HttpStatusCode.Forbidden);
return VfReturnType.VirtualSkip;
}
//Parse the jwt
using JsonWebToken jwt = JsonWebToken.Parse(jwtAuth);
//Init signature alg
using (ECDsa alg = ECDsa.Create(FBMDataCacheExtensions.CacheCurve))
{
//Get pub key
byte[] key = await GetBrokerPubAsync();
alg.ImportSubjectPublicKeyInfo(key, out _);
//Verify the jwt
if (!jwt.Verify(alg, FBMDataCacheExtensions.CacheJwtAlgorithm))
{
//Token invalid
entity.CloseResponse(HttpStatusCode.Forbidden);
return VfReturnType.VirtualSkip;
}
}
string? auth;
//Recover the auth token from the jwt
using (JsonDocument doc = jwt.GetPayload())
{
auth = doc.RootElement.GetProperty("token").GetString();
}
//Verify token
if(Token().Equals(auth, StringComparison.Ordinal))
{
//Signal keepalive
KeepaliveSet.Set();
entity.CloseResponse(HttpStatusCode.OK);
return VfReturnType.VirtualSkip;
}
//Token invalid
entity.CloseResponse(HttpStatusCode.Forbidden);
return VfReturnType.VirtualSkip;
}
}
}
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