function TestHttpClientMiddleware::__invoke

HTTP middleware that replaces the user agent for simpletest requests.

File

core/lib/Drupal/Core/Test/HttpClientMiddleware/TestHttpClientMiddleware.php, line 19

Class

TestHttpClientMiddleware

Overrides the User-Agent HTTP header for outbound HTTP requests.

Namespace

Code

public function __invoke() {
    // If the database prefix is being used by SimpleTest to run the tests in a copied
    // database then set the user-agent header to the database prefix so that any
    // calls to other Drupal pages will run the SimpleTest prefixed database. The
    // user-agent is used to ensure that multiple testing sessions running at the
    // same time won't interfere with each other as they would if the database
    // prefix were stored statically in a file or database variable.
    return function ($handler) {
        return function (RequestInterface $request, array $options) use ($handler) {
            if ($test_prefix = drupal_valid_test_ua()) {
                $request = $request->withHeader('User-Agent', drupal_generate_test_ua($test_prefix));
            }
            return $handler($request, $options)->then(function (ResponseInterface $response) {
                if (!drupal_valid_test_ua()) {
                    return $response;
                }
                $headers = $response->getHeaders();
                foreach ($headers as $header_name => $header_values) {
                    if (preg_match('/^X-Drupal-Assertion-[0-9]+$/', $header_name, $matches)) {
                        foreach ($header_values as $header_value) {
                            $parameters = unserialize(urldecode($header_value));
                            if (count($parameters) === 3) {
                                if ($parameters[1] === 'User deprecated function') {
                                    // Fire the same deprecation message to allow it to be
                                    // collected by
                                    // \Symfony\Bridge\PhpUnit\DeprecationErrorHandler::collectDeprecations().
                                    @trigger_error((string) $parameters[0], E_USER_DEPRECATED);
                                }
                                else {
                                    throw new \Exception($parameters[1] . ': ' . $parameters[0] . "\n" . Error::formatBacktrace([
                                        $parameters[2],
                                    ]));
                                }
                            }
                            else {
                                throw new \Exception('Error thrown with the wrong amount of parameters.');
                            }
                        }
                    }
                }
                return $response;
            });
        };
    };
}