feat(apiv2): group stubs, authentication middleware, /systems/:id endpoint

PluralKit.API/Middleware/AuthorizationTokenHandlerMiddleware.cs

@@ -0,0 +1,36 @@
+using System.Threading.Tasks;
+
+using Microsoft.AspNetCore.Http;
+
+using Dapper;
+
+using PluralKit.Core;
+
+namespace PluralKit.API
+{
+    public class AuthorizationTokenHandlerMiddleware
+    {
+        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)
+            {
+                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);
+        }
+    }
+}