feat: add simple router

src/router-simple.ts

@@ -0,0 +1,62 @@
+import { pathToRegexp, match, Key } from 'path-to-regexp';
+import type { IncomingMessage, ServerResponse } from 'http';
+
+type Req = IncomingMessage & { params?: Record<string, string> };
+interface Route {
+  method: string;
+  regexp: RegExp;
+  keys: Key[];
+  handlers: Array<(req: Req, res: ServerResponse) => Promise<void> | void>;
+}
+/**
+ * SimpleRouter
+ */
+export class SimpleRouter {
+  routes: Route[] = [];
+
+  constructor() {
+    // console.log('AppSimple initialized');
+  }
+
+  use(method: string, route: string, ...fns: Array<(req: Req, res: ServerResponse) => Promise<void> | void>) {
+    const handlers = Array.isArray(fns) ? fns.flat() : [];
+    const pattern = pathToRegexp(route);
+
+    this.routes.push({ method: method.toLowerCase(), regexp: pattern.regexp, keys: pattern.keys, handlers });
+    return this;
+  }
+  get(route: string, ...fns: Array<(req: Req, res: ServerResponse) => Promise<void> | void>) {
+    return this.use('get', route, ...fns);
+  }
+  post(route: string, ...fns: Array<(req: Req, res: ServerResponse) => Promise<void> | void>) {
+    return this.use('post', route, ...fns);
+  }
+  parse(req: Req, res: ServerResponse) {
+    const { pathname } = new URL(req.url, 'http://localhost');
+    const method = req.method.toLowerCase();
+
+    const route = this.routes.find((route) => {
+      const matchResult = route.regexp.exec(pathname);
+      if (matchResult && route.method === method) {
+        const params: Record<string, string> = {};
+        route.keys.forEach((key, i) => {
+          params[key.name] = matchResult[i + 1];
+        });
+        req.params = params;
+        return true;
+      }
+    });
+
+    if (route) {
+      const { handlers } = route;
+      return handlers.reduce((promiseChain, handler) => promiseChain.then(() => Promise.resolve(handler(req, res))), Promise.resolve());
+    }
+
+    if (!res?.headersSent && res && res?.end) {
+      res.statusCode = 404;
+      res.end('Not Found');
+    } else {
+      console.error('Not Found');
+    }
+  }
+}