How can I prepend a common path to all my routes?

You may have multiple middleware in your project, each providing their own functionality:

$app->pipe(UserMiddleware::class);
$app->pipe(ProjectMiddleware::class);

Let's assume the above represents an API.

As your application progresses, you may have a mixture of different content, and now want to have the above segregated under the path /api.

To accomplish it, we will pipe an array of middleware under a path, /api.

When we pipe an array of middleware, internally, Zend\Expressive\Application creates a new Zend\Stratigility\MiddlewarePipe instance, and pipes each middleware item to it.

When we specify a path, the middleware is decorated with a Zend\Stratigility\Middleware\PathMiddlewareDecorator. This middleware will compare the request path against the path with which it was created; if they match, it passes processing on to its middleware.

The following example assumes you are using the structure of config/pipeline.php as shipped with the skeleton application.

use Psr\Container\ContainerInterface;
use Zend\Expressive\Application;
use Zend\Expressive\MiddlewareFactory;

/**
 * Setup middleware pipeline:
 */
return function (Application $app, MiddlewareFactory $factory, ContainerInterface $container) : void {
    // . . .
    $app->pipe('/api', [
        UserMiddleware::class,
        ProjectMiddleware::class,
    ]);
    // . . .
}

Alternately, you can perform the path decoration manually:

use Psr\Container\ContainerInterface;
use Zend\Expressive\Application;
use Zend\Expressive\MiddlewareFactory;

use function Zend\Stratigility\path;

/**
 * Setup middleware pipeline:
 */
return function (Application $app, MiddlewareFactory $factory, ContainerInterface $container) : void {
    // . . .
    $app->pipe(path('/api', $factory->pipeline(
        UserMiddleware::class,
        ProjectMiddleware::class
    )));
    // . . .
}

(Calling $factory->pipeline() is necessary here to ensure that we create the MiddlewarePipe instance, and so that each item in the specified pipeline will be decorated as Zend\Expressive\Middleware\LazyLoadingMiddleware.)

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