Routing for HTTP servers in PHP

AMPHP is a collection of event-driven libraries for PHP designed with fibers and concurrency in mind. This package provides a routing RequestHandler for amphp/http-server based on the request path and method using FastRoute.

Installation

This package can be installed as a Composer dependency. You should specify amphp/http-server as a separate dependency.

composer require amphp/http-server-router

Usage

Router implements RequestHandler, which is used by an HttpServer to handle incoming requests. Incoming requests are routed by Router to other RequestHandlers based on the request path.

Routes can be defined using the addRoute($method, $uri, $requestHandler) method.

public function addRoute(
    string $method,
    string $uri,
    RequestHandler $requestHandler
): void

Matched route arguments are available in the request attributes under the Amp\Http\Server\Router key as an associative array. Please read the FastRoute documentation on how to define placeholders.

Middleware

You can stack all routes with a common set of middleware using addMiddleware($middleware). Each middleware is called in the order of the addMiddleware() calls. The router will not invoke any middleware for the fallback handler.

public function addMiddleware(Middleware $middleware): void

Per-route middleware can be added by using Amp\Http\Server\Middleware\stackMiddleware() before passing the RequestHandler to addRoute().

Fallback

If no routes match a request path, you can specify another instance of RequestHandler which will handle any unmatched routes. If no fallback handler is provided, a 404 response will be returned using the instance of ErrorHandler provided to the Router constructor.

public function setFallback(RequestHandler $requestHandler): void

Middleware defined by Router::addMiddleware() will not be invoked when a request is forwarded to fallback handler. Use Amp\Http\Server\Middleware\stackMiddleware() to wrap the fallback request handler with any middlewares needed first.

Example

use Amp\Http\HttpStatus;
use Amp\Http\Server\DefaultErrorHandler;
use Amp\Http\Server\Request;
use Amp\Http\Server\RequestHandler\ClosureRequestHandler;
use Amp\Http\Server\Response;
use Amp\Http\Server\Router;
use Amp\Http\Server\SocketHttpServer;

// $logger is an instance of a PSR-3 logger.
$server = SocketHttpServer::createForDirectAccess($logger);
$errorHandler = new DefaultErrorHandler();

$router = new Router($server, $logger, $errorHandler);

$router->addRoute('GET', '/', new ClosureRequestHandler(
    function () {
        return new Response(
            status: HttpStatus::OK,
            headers: ['content-type' => 'text/plain'],
            body: 'Hello, world!',
        );
    },
));

$router->addRoute('GET', '/{name}', new ClosureRequestHandler(
    function (Request $request) {
        $args = $request->getAttribute(Router::class);
        return new Response(
            status: HttpStatus::OK,
            headers: ['content-type' => 'text/plain'],
            body: "Hello, {$args['name']}!",
        );
    },
));

$server->expose('0.0.0.0:1337');

$server->start($router, $errorHandler);

// Serve requests until SIGINT or SIGTERM is received by the process.
Amp\trapSignal([SIGINT, SIGTERM]);

$server->stop();

A full example is found in examples/hello-world.php.

php examples/hello-world.php

Limitations

The Router will decode the URI path before matching. This will also decode any forward slashes (/), which might result in unexpected matching for URIs with encoded slashes. FastRoute placeholders match path segments by default, which are separated by slashes. That means a route like /token/{token} won’t match if the token contains an encoded slash. You can work around this limitation by using a custom regular expression for the placeholder like /token/{token:.+}.

Security

If you discover any security related issues, please use the private security issue reporter instead of using the public issue tracker.

License

The MIT License (MIT). Please see LICENSE for more information.