W5 done

w5/router.js

@@ -0,0 +1,54 @@
+"use strict";
+
+/**
+ * 
+ * @param {String} method 
+ * @param {String} path 
+ */
+export function route(method, path) {
+    return `route::${method}::${path}`;
+}
+
+export class Router {
+    /** @type {Map.<Route, Function<http.IncomingMessage, http.ServerResponse, String, Object>>} */ 
+    routes = new Map();
+
+    /**
+     * 
+     * @param {Route} route 
+     * @param {Function.<http.IncomingMessage, http.ServerResponse, String, Object>} func 
+     */
+    addRoute(route, func) {
+        if (this.routes.has(route)) {
+            throw new Error(`Route ${route} already exists!`);
+        }
+        this.routes.set(route, func);
+    }
+
+    /**
+     * 
+     * @param {Route} route 
+     * @returns Function for dispatchng this route
+     */
+    dispatch(route) {
+        if (this.routes.has(route)) {
+            return this.routes.get(route);
+        }
+        return this.returnError(404, "Not found!");
+    }
+
+    /**
+     * 
+     * @param {Number} code 
+     * @param {String} message 
+     * @param {String} contentType
+     */
+    returnError(code, message, contentType="text/plain") {
+        return (req, res) => {
+            res.setHeader("Content-Type", contentType);
+            res.statusCode = code;
+            res.write(message);
+            res.end();
+        };
+    }
+}