Initial Commit

Akari.Prototype.Server/Akari.Prototype.Server.csproj

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+<Project Sdk="Microsoft.NET.Sdk.Web">
+
+  <PropertyGroup>
+    <TargetFramework>net5.0</TargetFramework>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <Protobuf Include="Protos\greet.proto" GrpcServices="Server" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Grpc.AspNetCore" Version="2.34.0" />
+  </ItemGroup>
+
+</Project>

Akari.Prototype.Server/Options/TcpProviderOptions.cs

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+using Akari.Prototype.Server.Utils;
+using System;
+using System.Collections.Generic;
+using System.ComponentModel.DataAnnotations;
+using System.Linq;
+using System.Net;
+using System.Threading.Tasks;
+
+namespace Akari.Prototype.Server.Options
+{
+    public class TcpProviderOptions
+    {
+        public const string FilePath = "provider.json";
+        public const string SectionPath = "Provider";
+
+        [IPAddress]
+        public string ListeningAddress { get; set; } = "0.0.0.0";
+
+        [Range(ushort.MinValue, ushort.MaxValue)]
+        public int Port { get; set; } = 1892;
+    }
+}

Akari.Prototype.Server/Program.cs

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+using Akari.Prototype.Server.Options;
+using Microsoft.AspNetCore.Hosting;
+using Microsoft.Extensions.Configuration;
+using Microsoft.Extensions.Hosting;
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Security.Cryptography;
+using System.Threading.Tasks;
+
+namespace Akari.Prototype.Server
+{
+    public class Program
+    {
+        public static void Main(string[] args)
+        {
+            CreateHostBuilder(args).Build().Run();
+        }
+
+        // Additional configuration is required to successfully run gRPC on macOS.
+        // For instructions on how to configure Kestrel and gRPC clients on macOS, visit https://go.microsoft.com/fwlink/?linkid=2099682
+        public static IHostBuilder CreateHostBuilder(string[] args) =>
+            Host.CreateDefaultBuilder(args)
+                .ConfigureHostConfiguration(configuration =>
+                {
+                    configuration.AddJsonFile(TcpProviderOptions.FilePath, true);
+                })
+                .ConfigureWebHostDefaults(webBuilder =>
+                {
+                    webBuilder.UseStartup<Startup>();
+                });
+    }
+}

Akari.Prototype.Server/Properties/launchSettings.json

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+{
+  "profiles": {
+    "Akari.Prototype.Server": {
+      "commandName": "Project",
+      "dotnetRunMessages": "true",
+      "launchBrowser": false,
+      "applicationUrl": "http://localhost:5000;https://localhost:5001",
+      "environmentVariables": {
+        "ASPNETCORE_ENVIRONMENT": "Development"
+      }
+    }
+  }
+}

Akari.Prototype.Server/Protos/greet.proto

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+syntax = "proto3";
+
+option csharp_namespace = "Akari.Prototype.Server";
+
+package greet;
+
+// The greeting service definition.
+service Greeter {
+  // Sends a greeting
+  rpc SayHello (HelloRequest) returns (HelloReply);
+}
+
+// The request message containing the user's name.
+message HelloRequest {
+  string name = 1;
+}
+
+// The response message containing the greetings.
+message HelloReply {
+  string message = 1;
+}

Akari.Prototype.Server/Services/GreeterService.cs

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+using Grpc.Core;
+using Microsoft.Extensions.Logging;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+
+namespace Akari.Prototype.Server
+{
+    public class GreeterService : Greeter.GreeterBase
+    {
+        private readonly ILogger<GreeterService> _logger;
+        public GreeterService(ILogger<GreeterService> logger)
+        {
+            _logger = logger;
+        }
+
+        public override Task<HelloReply> SayHello(HelloRequest request, ServerCallContext context)
+        {
+            return Task.FromResult(new HelloReply
+            {
+                Message = "Hello " + request.Name
+            });
+        }
+    }
+}

Akari.Prototype.Server/Services/TcpProviderService.cs

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+using Akari.Prototype.Server.Options;
+using Microsoft.Extensions.Hosting;
+using Microsoft.Extensions.Logging;
+using Microsoft.Extensions.Options;
+using System;
+using System.Buffers.Text;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Net;
+using System.Net.Sockets;
+using System.Threading;
+using System.Threading.Tasks;
+
+namespace Akari.Prototype.Server.Services
+{
+    public class TcpProviderService : BackgroundService
+    {
+        public const int BufferLength = 4096;
+        public const int MaxTokenLength = 192;
+        public const int ReceiveTimeout = 500_000;
+
+        private readonly ILogger<TcpProviderService> _logger;
+        private readonly TcpProviderOptions _options;
+        private readonly IHostApplicationLifetime _hostApplicationLifetime;
+        private Task _backgroundTask;
+        private TcpListener _listener;
+
+        public TcpProviderService(ILogger<TcpProviderService> logger, IOptions<TcpProviderOptions> options, IHostApplicationLifetime hostApplicationLifetime)
+        {
+            _logger = logger;
+            _options = options.Value;
+            _hostApplicationLifetime = hostApplicationLifetime;
+        }
+
+        protected override async Task ExecuteAsync(CancellationToken stoppingToken)
+        {
+            await TcpLoop(stoppingToken);
+        }
+
+        private async Task TcpLoop(CancellationToken cancellationToken)
+        {
+            if (cancellationToken.IsCancellationRequested)
+            {
+                return;
+            }
+
+            try
+            {
+                _listener = new TcpListener(IPAddress.Parse(_options.ListeningAddress), _options.Port);
+                _listener.Start();
+
+                _logger.LogInformation($"Now listening on: {_listener.LocalEndpoint}");
+
+                while (!cancellationToken.IsCancellationRequested)
+                {
+                    _logger.LogDebug("Waiting for client...");
+                    var task = await Task.WhenAny(_listener.AcceptTcpClientAsync(), Task.Delay(Timeout.Infinite, cancellationToken));
+
+                    if (task is not Task<TcpClient> clientTask)
+                    {
+                        return;
+                    }
+
+                    using var client = clientTask.Result;
+
+                    _logger.LogDebug($"Client connected from: {client.Client.RemoteEndPoint}");
+
+                    try
+                    {
+                        await ReceiveAuth(client, cancellationToken);
+                    }
+                    catch (Exception e)
+                    {
+                        _logger.LogDebug($"Couldn't proccess client request: {e.Message}");
+                    }
+                }
+            }
+            catch (Exception e)
+            {
+                _logger.LogError(e.ToString());
+                _logger.LogError("An error occured in TcpProvider, exiting...");
+
+                _hostApplicationLifetime.StopApplication();
+
+                Environment.Exit(1);
+            }
+            finally
+            {
+                _listener?.Stop();
+            }
+        }
+
+        private async Task ReceiveAuth(TcpClient client, CancellationToken cancellationToken)
+        {
+            using var stream = client.GetStream();
+            var data = new Memory<byte>(new byte[MaxTokenLength]);
+            var buffer = new Memory<byte>(new byte[BufferLength]);
+
+            // Receive token
+            int position = 0;
+            int read = 0;
+
+            var timeoutToken = CancellationTokenSource.CreateLinkedTokenSource(cancellationToken, new CancellationTokenSource(ReceiveTimeout).Token).Token;
+
+            _logger.LogDebug("Waiting for token...");
+            while (position < MaxTokenLength && (read = await stream.ReadAsync(buffer, timeoutToken)) != 0)
+            {
+                if (position + read > data.Length)
+                {
+                    // Invalid token
+                    return;
+                }
+
+                buffer[..read].CopyTo(data[position..]);
+
+                position += read;
+            }
+
+            // TODO: Send token to AuthManager that will compare it to stored hash using Argon2
+            _logger.LogDebug($"Received token: {Convert.ToBase64String(data[..position].Span)}");
+        }
+    }
+}

Akari.Prototype.Server/Startup.cs

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+using Akari.Prototype.Server.Options;
+using Akari.Prototype.Server.Services;
+using Microsoft.AspNetCore.Builder;
+using Microsoft.AspNetCore.Hosting;
+using Microsoft.AspNetCore.Http;
+using Microsoft.Extensions.Configuration;
+using Microsoft.Extensions.DependencyInjection;
+using Microsoft.Extensions.Hosting;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+
+namespace Akari.Prototype.Server
+{
+    public class Startup
+    {
+        public IConfiguration Configuration { get; }
+
+        public Startup(IConfiguration configuration)
+        {
+            Configuration = configuration;
+        }
+
+        // This method gets called by the runtime. Use this method to add services to the container.
+        // For more information on how to configure your application, visit https://go.microsoft.com/fwlink/?LinkID=398940
+        public void ConfigureServices(IServiceCollection services)
+        {
+            services.AddGrpc();
+
+            services.AddOptions<TcpProviderOptions>()
+                    .Bind(Configuration.GetSection(TcpProviderOptions.SectionPath))
+                    .ValidateDataAnnotations();
+
+            services.AddHostedService<TcpProviderService>();
+        }
+
+        // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
+        public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
+        {
+            if (env.IsDevelopment())
+            {
+                app.UseDeveloperExceptionPage();
+            }
+
+            app.UseRouting();
+
+            app.UseEndpoints(endpoints =>
+            {
+                endpoints.MapGrpcService<GreeterService>();
+
+                endpoints.MapGet("/", async context =>
+                {
+                    await context.Response.WriteAsync("Communication with gRPC endpoints must be made through a gRPC client. To learn how to create a client, visit: https://go.microsoft.com/fwlink/?linkid=2086909");
+                });
+            });
+        }
+    }
+}

Akari.Prototype.Server/Utils/IPAddressAttribute.cs

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+using System;
+using System.Collections.Generic;
+using System.ComponentModel.DataAnnotations;
+using System.Linq;
+using System.Net;
+using System.Threading.Tasks;
+
+namespace Akari.Prototype.Server.Utils
+{
+    public class IPAddressAttribute : ValidationAttribute
+    {
+        public IPAddressAttribute() : base("Must be a valid IP address")
+        {
+            
+        }
+
+        public override bool IsValid(object value)
+        {
+            if (value is null)
+            {
+                return true;
+            }
+
+            return value is string ip && IPAddress.TryParse(ip, out _);
+        }
+    }
+}

Akari.Prototype.Server/appsettings.Development.json

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+{
+  "Logging": {
+    "LogLevel": {
+      "Default": "Debug",
+      "System": "Information",
+      "Grpc": "Information",
+      "Microsoft": "Information"
+    }
+  }
+}

Akari.Prototype.Server/appsettings.json

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+{
+  "Logging": {
+    "LogLevel": {
+      "Default": "Information",
+      "Microsoft": "Warning",
+      "Microsoft.Hosting.Lifetime": "Information"
+    }
+  },
+  "AllowedHosts": "*",
+  "Kestrel": {
+    "EndpointDefaults": {
+      "Protocols": "Http2"
+    }
+  }
+}

Akari.Prototype.Server/provider.json

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+{
+    "Provider":
+    {
+		"ListeningAddress": "0.0.0.0",
+		"Port": 1892
+    }
+}