feat: upgrade to .NET 6, refactor everything

PluralKit.API/Middleware/AuthorizationTokenHandlerMiddleware.cs

@@ -1,36 +1,32 @@
-using System.Threading.Tasks;
-
-using Microsoft.AspNetCore.Http;
-
 using Dapper;
 
 using PluralKit.Core;
 
-namespace PluralKit.API
+namespace PluralKit.API;
+
+public class AuthorizationTokenHandlerMiddleware
 {
-    public class AuthorizationTokenHandlerMiddleware
+    private readonly RequestDelegate _next;
+
+    public AuthorizationTokenHandlerMiddleware(RequestDelegate next)
     {
-        private readonly RequestDelegate _next;
-        public AuthorizationTokenHandlerMiddleware(RequestDelegate next)
+        _next = next;
+    }
+
+    public async Task Invoke(HttpContext ctx, IDatabase db)
+    {
+        ctx.Request.Headers.TryGetValue("authorization", out var authHeaders);
+        if (authHeaders.Count > 0)
         {
-            _next = next;
+            var systemId = await db.Execute(conn => conn.QuerySingleOrDefaultAsync<SystemId?>(
+                "select id from systems where token = @token",
+                new { token = authHeaders[0] }
+            ));
+
+            if (systemId != null)
+                ctx.Items.Add("SystemId", systemId);
         }
 
-        public async Task Invoke(HttpContext ctx, IDatabase db)
-        {
-            ctx.Request.Headers.TryGetValue("authorization", out var authHeaders);
-            if (authHeaders.Count > 0)
-            {
-                var systemId = await db.Execute(conn => conn.QuerySingleOrDefaultAsync<SystemId?>(
-                    "select id from systems where token = @token",
-                    new { token = authHeaders[0] }
-                ));
-
-                if (systemId != null)
-                    ctx.Items.Add("SystemId", systemId);
-            }
-
-            await _next.Invoke(ctx);
-        }
+        await _next.Invoke(ctx);
     }
 }