middleware works as it should! With recursion, which I hate :)

server/main.ts

@@ -7,12 +7,14 @@ import { ok, ResultFromJSON } from "@shared/utils/result.ts";
 import { ResultResponseFromJSON } from "@src/lib/context.ts";
 import admin from "@src/lib/admin.ts";
 import UsbipManager from "@shared/utils/usbip.ts";
+import loggerMiddleware from "@src/middleware/logger.ts";
 
 const router = new HttpRouter();
 
 const views = Deno.cwd() + "/views/";
 const eta = new Eta({ views });
 
+router.use(loggerMiddleware);
 router.use(rateLimitMiddleware);
 router.use(authMiddleware);
 

server/src/lib/router.ts

@@ -8,7 +8,7 @@ type RequestHandler<S extends string> = (
 export type Middleware = (
     c: Context<string>,
     next: () => Promise<void>,
-) => Promise<Response | undefined> | Response | undefined;
+) => Promise<Response | void> | Response | void;
 
 type MethodHandlers<S extends string> = Partial<
     Record<string, RequestHandler<S>>
@@ -19,7 +19,7 @@ const DEFAULT_NOT_FOUND_HANDLER = () => new Response("404 Not found");
 class HttpRouter {
     routerTree = new RouterTree<MethodHandlers<any>>();
     pathPreprocessor?: (path: string) => string;
-    middlewareChain: Middleware[] = [];
+    middlewares: Middleware[] = [];
     defaultNotFoundHandler: RequestHandler<string> = DEFAULT_NOT_FOUND_HANDLER;
 
     setPathProcessor(processor: (path: string) => string) {
@@ -27,7 +27,7 @@ class HttpRouter {
     }
 
     use(mw: Middleware): HttpRouter {
-        this.middlewareChain.push(mw);
+        this.middlewares.push(mw);
         return this;
     }
 
@@ -99,23 +99,58 @@ class HttpRouter {
     ): Promise<Response> {
         const c = new Context(req, connInfo, {});
 
-        let i = 0;
-        const mw = this.middlewareChain[i++];
-
         const path = this.pathPreprocessor
             ? this.pathPreprocessor(c.path)
             : c.path;
 
-        return await this.routerTree
+        let params: Params<string> = {};
+
+        const handler = this.routerTree
             .find(path)
             .andThen((routeMatch) => {
-                const { value, params } = routeMatch;
-                const handler = value[req.method];
-                return handler
-                    ? some(handler(Context.setParams(c, params)))
-                    : none;
+                const { value: handlers, params: paramsMatched } = routeMatch;
+                params = paramsMatched;
+                const handler = handlers[req.method];
+                return handler ? some(handler) : none;
             })
-            .unwrapOrElse(() => this.defaultNotFoundHandler(c));
+            .unwrapOrElse(() => this.defaultNotFoundHandler);
+
+        const cf = await this.executeMiddlewareChain(
+            this.middlewares,
+            handler,
+            Context.setParams(c, params),
+        );
+
+        return cf.res;
+    }
+
+    private async executeMiddlewareChain<S extends string>(
+        middlewares: Middleware[],
+        handler: RequestHandler<S>,
+        c: Context<S>,
+    ) {
+        let currentIndex = -1;
+
+        const dispatch = async (index: number): Promise<void> => {
+            currentIndex = index;
+
+            if (index < middlewares.length) {
+                const middleware = middlewares[index];
+
+                const result = await middleware(c, () => dispatch(index + 1));
+
+                if (result !== undefined) {
+                    c.res = await Promise.resolve(result);
+                }
+            } else {
+                const res = await handler(c);
+                c.res = res;
+            }
+        };
+
+        await dispatch(0);
+
+        return c;
     }
 }
 

server/src/middleware/auth.ts

@@ -3,7 +3,7 @@ import admin from "@lib/admin.ts";
 
 const LOGIN_PATH = "/login";
 
-const authMiddleware: Middleware = (c) => {
+const authMiddleware: Middleware = async (c, next) => {
     const token = c.cookies.get("token");
     const isValid = token
         .map((token) => admin.sessions.verifyToken(token))
@@ -11,9 +11,8 @@ const authMiddleware: Middleware = (c) => {
     const path = c.path;
 
     if (path.startsWith("/public")) {
-        return;
-    }
-
+        await next();
+    } else {
         if (path !== LOGIN_PATH && !isValid) {
             return c.redirect("/login");
         }
@@ -21,6 +20,9 @@ const authMiddleware: Middleware = (c) => {
         if (path === LOGIN_PATH && isValid) {
             return c.redirect("");
         }
+
+        await next();
+    }
 };
 
 export default authMiddleware;

server/src/middleware/logger.ts

@@ -0,0 +1,9 @@
+import { Middleware } from "@lib/router.ts";
+
+const loggerMiddleware: Middleware = async (c, next) => {
+    console.log(c.req.method, c.path);
+    await next();
+    console.log(c.res.status);
+};
+
+export default loggerMiddleware;

server/src/middleware/rateLimiter.ts

@@ -8,7 +8,7 @@ const requestCounts: Partial<
 const MAX_REQUESTS_PER_WINDOW = 300;
 const RATE_LIMIT_WINDOW = 60000;
 
-const rateLimitMiddleware: Middleware = (c) => {
+const rateLimitMiddleware: Middleware = async (c, next) => {
     const hostnameOpt = c.hostname;
 
     if (hostnameOpt.isSome()) {
@@ -19,15 +19,9 @@ const rateLimitMiddleware: Middleware = (c) => {
 
         if (!clientCount || now - clientCount.lastReset > RATE_LIMIT_WINDOW) {
             requestCounts[hostname] = { count: 1, lastReset: now };
-            return;
-        }
-
-        if (clientCount.count < MAX_REQUESTS_PER_WINDOW) {
+        } else if (clientCount.count < MAX_REQUESTS_PER_WINDOW) {
             clientCount.count++;
-            return;
-        }
-
-        if (c.preferredType.isSome()) {
+        } else if (c.preferredType.isSome()) {
             log.info(`client ${hostname} is rate limeted`);
             switch (c.preferredType.value) {
                 case "html": {
@@ -46,11 +40,13 @@ const rateLimitMiddleware: Middleware = (c) => {
                     );
                 }
             }
-        }
+        } else {
             return new Response("429 Too Many Request", {
                 status: 429,
             });
         }
+    }
+    await next();
 };
 
 export default rateLimitMiddleware;

server/test.tex

@@ -1,3 +0,0 @@
-quantile
-
-quntile