refactor(router): reorganize Router class into separate index file and remove legacy router.js

1 files changed, 107 insertions, 0 deletions

diff --git a/source/library/router/index.js b/source/library/router/index.js
new file mode 100644
index 0000000..d0914ff
--- /dev/null
+++ b/source/library/router/index.js
@@ -0,0 +1,107 @@
+/*
+  Router class to handle routing of requests based on the request path.
+
+  @param {Request} request - the incoming request object
+  @param {Environment} environment - the environment object
+  @param {Context} context - the context object
+
+  @returns {Response} a new Response object
+*/
+export default class Router {
+  constructor(request, environment, context) {
+    this.request = request;
+    this.environment = environment;
+    this.context = context;
+    this.routes = new Map(); // Use Map for faster lookups
+    this.parameters = {}; // Store extracted route parameters
+  }
+
+  /*
+    Add a new route to the router.
+
+    @param {string} path - the path to match
+    @param {function} handler - the handler function to call if the path matches
+
+    @returns {Router} the router object
+  */
+  add(path, handler) {
+    if (typeof path !== "string") {
+      throw new TypeError("Path must be a string");
+    }
+    if (typeof handler !== "function") {
+      throw new TypeError("Handler must be a function");
+    }
+
+    const normalizedPath = path.replace(/\/+$/, ""); // Normalize path
+    const pathRegex = new RegExp(
+      "^" +
+        normalizedPath
+          .replace(/:[^/]+/g, "([^/]+)") // Convert :param to regex group
+          .replace(/\//g, "\\/") +
+        "$"
+    );
+    this.routes.set(pathRegex, { handler, originalPath: normalizedPath });
+    return this;
+  }
+
+  /*
+    Helper function to respond with a JSON object.
+
+    @param {object} body - the JSON object to respond with
+    
+    @returns {Response} a new Response object
+  */
+  respond(body, status = 200) {
+    return new Response(JSON.stringify(body), {
+      status,
+      headers: {
+        "Access-Control-Allow-Origin": "*",
+        "Content-Type": "application/json",
+      },
+    });
+  }
+
+  /*
+    Route the request to the appropriate handler based on the request path.
+
+    @returns {Response} a new Response object
+  */
+  route() {
+    try {
+      const url = new URL(this.request.url);
+      const normalizedPath = url.pathname.replace(/\/+$/, ""); // Remove trailing slashes
+
+      for (const [pathRegex, { handler, originalPath }] of this.routes) {
+        const match = normalizedPath.match(pathRegex);
+        if (match) {
+          // Extract parameters
+          const paramNames = [...originalPath.matchAll(/:([^/]+)/g)].map(
+            (m) => m[1]
+          );
+          this.parameters = paramNames.reduce((params, name, index) => {
+            params[name] = match[index + 1];
+            return params;
+          }, {});
+
+          return handler(this.request, this.environment, this.context);
+        }
+      }
+
+      // Return 404 if route not found
+      return this.respond(
+        {
+          error: `Route not found: ${normalizedPath}`,
+        },
+        404
+      );
+    } catch (error) {
+      // Handle unexpected errors
+      return this.respond(
+        {
+          error: `Internal Server Error: ${error.message}`,
+        },
+        500
+      );
+    }
+  }
+}