move card storage/web server handlers to separate files

AMNet.Server/WebServer.cs

@@ -1,5 +1,16 @@
 using System;
+using System.Collections;
+using System.Collections.Generic;
+using System.Globalization;
+using System.Linq;
+using System.Net;
+using System.Net.NetworkInformation;
+using System.Net.Sockets;
+using System.Text.Json;
+using System.Threading.Tasks;
 using Microsoft.AspNetCore.Builder;
+using Microsoft.AspNetCore.Hosting;
+using Microsoft.AspNetCore.Http;
 using Microsoft.Extensions.DependencyInjection;
 using Microsoft.Extensions.Logging;
 
@@ -7,10 +18,14 @@ namespace AMNet.Server;
 
 internal static class WebServer
 {
-    public static WebApplicationBuilder BuildServer()
+    private const int ApiVersion = 1;
+
+    public static WebApplication BuildServer(params string[] listenAddresses)
     {
         var builder = WebApplication.CreateSlimBuilder([]);
 
+        builder.WebHost.UseUrls(listenAddresses);
+
         builder.Logging.ClearProviders();
         builder.Logging.AddSimpleConsole(o =>
         {
@@ -39,6 +54,67 @@ internal static class WebServer
             options.SerializerOptions.TypeInfoResolverChain.Insert(0, SerializerContext.Default);
         });
 
-        return builder;
+        builder.Services.AddSingleton<CardPresenter>();
+
+        var app = builder.Build();
+        
+        app.UseCors();
+        app.MapGet("/amnet/info", () => Results.Ok(new SystemState(ApiVersion, Config.GameId, Config.ServerName)));
+        app.MapPost("/amnet/signin", ProcessCard);
+
+        return app;
+    }
+    
+    private static async Task ProcessCard(HttpContext ctx)
+    {
+        CardReadRequest request;
+
+        try
+        {
+            request = await ctx.Request.ReadFromJsonAsync<CardReadRequest>();
+        }
+        catch (JsonException e)
+        {
+            ctx.Response.StatusCode = 400;
+            await ctx.Response.WriteAsync(e.Message);
+
+            return;
+        }
+
+        if (string.IsNullOrEmpty(request?.MatrixCode))
+        {
+            ctx.Response.StatusCode = 400;
+            await ctx.Response.WriteAsync("Card id not provided.");
+            return;
+        }
+
+        if (request.MatrixCode.Length is 0 or < 20)
+        {
+            ctx.Response.StatusCode = 422;
+            await ctx.Response.WriteAsync("Invalid card id length.");
+            return;
+        }
+
+        var cardPresenter = ctx.RequestServices.GetRequiredService<CardPresenter>();
+        var currentCard = cardPresenter.PeekActiveCard();
+
+        if (currentCard?.Expired == false)
+        {
+            var timeLeft = Math.Ceiling(TimeSpan.FromMilliseconds(currentCard.ExpiresAt - Environment.TickCount64).TotalSeconds);
+
+            ctx.Response.StatusCode = 429;
+            ctx.Response.Headers.RetryAfter = timeLeft.ToString(CultureInfo.InvariantCulture);
+            return;
+        }
+
+        if (cardPresenter.SetCard(request.MatrixCode))
+        {
+            ctx.Response.StatusCode = 202;
+        }
+        else
+        {
+            ctx.Response.StatusCode = 422;
+            await ctx.Response.WriteAsync("Invalid card id format.");
+        }
     }
 }