Shelf dynamic routes without the need to use mounts

[guibbv2011]

davidmartos96
jonasfj

If this separation of routes and dynamic routes is possible to do with vanilla shelf and router (no codegen) I would love to see it in action.

I build a package to "solve" this issue (https://pub.dev/packages/shelf_dynamic_forwarder)
https://github.com/guibbv2011/shelf_dynamic_forwarder

I don't use the mount function instead I call directly:

  return await handler!(subReq);

This will link the child router defined in map dynamicRoutes.

Here a example usage:

import 'dart:io';
import 'package:shelf/shelf.dart';
import 'package:shelf/shelf_io.dart';
import 'package:shelf_dynamic_forwarder/shelf_dynamic_forwarder.dart';
import 'package:shelf_router/shelf_router.dart';

Router get filenamesRequest {
  final handler = Router();
  handler.get('/filenames', (Request req) async {
    // Your logic code here..
    return Response.ok('');
  });
  return handler;
}

Router get fileRequest {
  final handler = Router();
  handler.get('/file', (Request req) async {
    // Your logic code here..
    return Response.ok('');
  });
  return handler;
}

final Map<String, Handler> dynamicRoutes = {
  'filenames': filenamesRequest,
  '.*': fileRequest,
};

Handler get router {
  final dynamicRouter = createDynamicRouter(
    routePattern: '/api/<adminId>/<index>/<path|.*>',
    routes: dynamicRoutes,
  );
  return dynamicRouter;
}

void main() async {
  final handler = 
    const Pipeline().addMiddleware(logRequests()).addHandler(router);
  await serve(handler, 'localhost', 8080);
}

And how I implemented it:

    // Create a new ABSOLUTE URI for the child router.
    // This isolates the child from the parent's base path and ensures the URI is absolute.
    final originalUri = request.requestedUri;

    final newUri = originalUri.replace(
      // Explicitly retain scheme, host, and port for absolute URI
      // Reset the path to only what the child router expects (e.g., /filenames)
      // pathSegments must be an Iterable<String>
      pathSegments: [pathSegment],
    );

    // 4. Create a brand new Request object using the new absolute URI.
    final subReq = Request(
      request.method,
      newUri,
      headers: newHeaders,
      body: await request.read(),
      context: request.context,
    );
}

Originally posted by @guibbv2011 in #288 (comment)