AdvisoryTestClientMiddleware.php

<?php

namespace Drupal\advisory_feed_test;

use GuzzleHttp\Promise\PromiseInterface;
use GuzzleHttp\Psr7\Uri;
use Psr\Http\Message\RequestInterface;

/**
 * Overrides the User-Agent HTTP header for outbound HTTP requests.
 */
class AdvisoryTestClientMiddleware {
    
    /**
     * HTTP middleware that replaces URI for advisory requests.
     */
    public function __invoke() {
        return function ($handler) {
            return function (RequestInterface $request, array $options) use ($handler) : PromiseInterface {
                $test_end_point = \Drupal::state()->get('advisories_test_endpoint');
                if ($test_end_point && str_contains($request->getUri(), '://updates.drupal.org/psa.json')) {
                    // Only override $uri if it matches the advisories JSON feed to avoid
                    // changing any other uses of the 'http_client' service during tests with
                    // this module installed.
                    $request = $request->withUri(new Uri($test_end_point));
                }
                return $handler($request, $options);
            };
        };
    }
    
    /**
     * Sets the test endpoint for the advisories JSON feed.
     *
     * @param string $test_endpoint
     *   The test endpoint.
     * @param bool $delete_stored_response
     *   Whether to delete stored feed response.
     */
    public static function setTestEndpoint(string $test_endpoint, bool $delete_stored_response = FALSE) : void {
        \Drupal::state()->set('advisories_test_endpoint', $test_endpoint);
        if ($delete_stored_response) {
            \Drupal::service('system.sa_fetcher')->deleteStoredResponse();
        }
    }

}