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/*
* Copyright (c) 2023 Vaughn Nugent
*
* Library: VNLib
* Package: ObjectCacheServer
* File: BrokerHeartBeatEndpoint.cs
*
* BrokerHeartBeatEndpoint.cs is part of ObjectCacheServer which is part of the larger
* VNLib collection of libraries and utilities.
*
* ObjectCacheServer 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.
*
* ObjectCacheServer 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.Linq;
using System.Text.Json;
using System.Threading.Tasks;
using VNLib.Plugins;
using VNLib.Utils.Logging;
using VNLib.Plugins.Essentials;
using VNLib.Hashing.IdentityUtility;
using VNLib.Plugins.Essentials.Endpoints;
using VNLib.Plugins.Essentials.Extensions;
using VNLib.Plugins.Extensions.Loading;
namespace VNLib.Data.Caching.ObjectCache.Server
{
internal sealed class BrokerHeartBeatEndpoint : ResourceEndpointBase
{
private readonly IBrokerHeartbeatNotifier _heartBeat;
private readonly Task<IPAddress[]> BrokerIpList;
private readonly bool DebugMode;
///<inheritdoc/>
protected override ProtectionSettings EndpointProtectionSettings { get; } = new()
{
DisableBrowsersOnly = true,
DisableSessionsRequired = true
};
public BrokerHeartBeatEndpoint(PluginBase plugin)
{
//Get debug flag
DebugMode = plugin.IsDebug();
//Get or create the current node config
_heartBeat = plugin.GetOrCreateSingleton<NodeConfig>();
/*
* Resolve the ip address of the broker and store it to verify connections
* later
*/
BrokerIpList = Dns.GetHostAddressesAsync(_heartBeat.GetBrokerAddress().DnsSafeHost);
//Setup endpoint
InitPathAndLog("/heartbeat", plugin.Log);
}
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))
{
if (DebugMode)
{
Log.Debug("Received connection {ip} that was not a DNS safe address for the broker server, access denied");
}
//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);
//Verify the jwt using the broker's public key certificate
using (ReadOnlyJsonWebKey cert = _heartBeat.GetBrokerPublicKey())
{
//Verify the jwt
if (!jwt.VerifyFromJwk(cert))
{
//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();
}
//Get our stored token used for registration
string? selfToken = _heartBeat.GetAuthToken();
//Verify token
if (selfToken != null && selfToken.Equals(auth, StringComparison.Ordinal))
{
//Signal keepalive
_heartBeat.HearbeatReceived();
entity.CloseResponse(HttpStatusCode.OK);
return VfReturnType.VirtualSkip;
}
if (DebugMode)
{
Log.Debug("Invalid auth token recieved from broker sever, access denied");
}
//Token invalid
entity.CloseResponse(HttpStatusCode.Forbidden);
return VfReturnType.VirtualSkip;
}
}
}
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