Add support for middleware

src/http/kernel/module/ExecuteResolvedRoutePreflightHTTPModule.ts

@@ -0,0 +1,29 @@
+import {HTTPKernel} from "../HTTPKernel";
+import {MountActivatedRouteHTTPModule} from "./MountActivatedRouteHTTPModule";
+import {Request} from "../../lifecycle/Request";
+import {ActivatedRoute} from "../../routing/ActivatedRoute";
+import {ResponseObject} from "../../routing/Route";
+import {AbstractResolvedRouteHandlerHTTPModule} from "./AbstractResolvedRouteHandlerHTTPModule";
+
+export class ExecuteResolvedRoutePreflightHTTPModule extends AbstractResolvedRouteHandlerHTTPModule {
+    public static register(kernel: HTTPKernel) {
+        kernel.register(this).after(MountActivatedRouteHTTPModule)
+    }
+
+    public async apply(request: Request) {
+        if ( request.hasInstance(ActivatedRoute) ) {
+            const route = <ActivatedRoute> request.make(ActivatedRoute)
+            const preflight = route.preflight
+
+            for ( const handler of preflight ) {
+                const result: ResponseObject = await handler(request)
+                if ( typeof result !== "undefined" ) {
+                    await this.applyResponseObject(result, request)
+                    request.response.blockingWriteback(true)
+                }
+            }
+        }
+
+        return request
+    }
+}