feat: middlewares

feat: highlighter

packages/sdk/src/middleware.ts

@@ -0,0 +1,61 @@
+import Route from 'route-parser';
+
+import {
+  HandlerInput,
+  RouteValues,
+  EngineOutput,
+  MiddleFunction,
+} from './types/handler';
+
+interface IMiddle<TParams extends RouteValues> {
+  route: Route;
+  handler: MiddleFunction<TParams>;
+}
+
+export class Middleware {
+  name: string;
+  description: string;
+  domains: string[];
+  // eslint-disable-next-line @typescript-eslint/no-explicit-any
+  middles: IMiddle<any>[] = [];
+  constructor(name: string, description: string, domains: string[] = []) {
+    this.domains = domains;
+    this.name = name;
+    this.description = description;
+  }
+
+  route<TParams extends RouteValues>(
+    path: string,
+    handler: MiddleFunction<TParams>
+  ) {
+    this.middles.push({ route: new Route<TParams>(path), handler });
+  }
+
+  use<TParams extends RouteValues>(handler: MiddleFunction<TParams>) {
+    this.middles.push({ route: new Route<{ path: string }>('*path'), handler });
+  }
+
+  async handle(input: HandlerInput, out: EngineOutput): Promise<EngineOutput> {
+    const url = new URL(input.url);
+    const path = url.pathname + url.search + url.hash;
+
+    let processed_out = out;
+
+    for (const middle of this.middles) {
+      const match = middle.route.match(path);
+
+      if (match) {
+        processed_out = await middle.handler(
+          input,
+          {
+            q: match,
+            reverse: (req) => middle.route.reverse(req),
+          },
+          out
+        );
+      }
+    }
+
+    return processed_out;
+  }
+}