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<?php
namespace Laminas\Mvc\View\Http;
use Exception;
use Throwable;
use Laminas\EventManager\AbstractListenerAggregate;
use Laminas\EventManager\EventManagerInterface;
use Laminas\Http\Response as HttpResponse;
use Laminas\Mvc\Application;
use Laminas\Mvc\MvcEvent;
use Laminas\Stdlib\ResponseInterface as Response;
use Laminas\View\Model\ViewModel;
class RouteNotFoundStrategy extends AbstractListenerAggregate
{
/**
* Whether or not to display exceptions related to the 404 condition
*
* @var bool
*/
protected $displayExceptions = false;
/**
* Whether or not to display the reason for a 404
*
* @var bool
*/
protected $displayNotFoundReason = false;
/**
* Template to use to report page not found conditions
*
* @var string
*/
protected $notFoundTemplate = 'error';
/**
* The reason for a not-found condition
*
* @var false|string
*/
protected $reason = false;
/**
* {@inheritDoc}
*/
public function attach(EventManagerInterface $events, $priority = 1)
{
$this->listeners[] = $events->attach(MvcEvent::EVENT_DISPATCH, [$this, 'prepareNotFoundViewModel'], -90);
$this->listeners[] = $events->attach(MvcEvent::EVENT_DISPATCH_ERROR, [$this, 'detectNotFoundError']);
$this->listeners[] = $events->attach(MvcEvent::EVENT_DISPATCH_ERROR, [$this, 'prepareNotFoundViewModel']);
}
/**
* Set value indicating whether or not to display exceptions related to a not-found condition
*
* @param bool $displayExceptions
* @return RouteNotFoundStrategy
*/
public function setDisplayExceptions($displayExceptions)
{
$this->displayExceptions = (bool) $displayExceptions;
return $this;
}
/**
* Should we display exceptions related to a not-found condition?
*
* @return bool
*/
public function displayExceptions()
{
return $this->displayExceptions;
}
/**
* Set value indicating whether or not to display the reason for a not-found condition
*
* @param bool $displayNotFoundReason
* @return RouteNotFoundStrategy
*/
public function setDisplayNotFoundReason($displayNotFoundReason)
{
$this->displayNotFoundReason = (bool) $displayNotFoundReason;
return $this;
}
/**
* Should we display the reason for a not-found condition?
*
* @return bool
*/
public function displayNotFoundReason()
{
return $this->displayNotFoundReason;
}
/**
* Get template for not found conditions
*
* @param string $notFoundTemplate
* @return RouteNotFoundStrategy
*/
public function setNotFoundTemplate($notFoundTemplate)
{
$this->notFoundTemplate = (string) $notFoundTemplate;
return $this;
}
/**
* Get template for not found conditions
*
* @return string
*/
public function getNotFoundTemplate()
{
return $this->notFoundTemplate;
}
/**
* Detect if an error is a 404 condition
*
* If a "controller not found" or "invalid controller" error type is
* encountered, sets the response status code to 404.
*
* @param MvcEvent $e
* @return void
*/
public function detectNotFoundError(MvcEvent $e)
{
$error = $e->getError();
if (empty($error)) {
return;
}
switch ($error) {
case Application::ERROR_CONTROLLER_NOT_FOUND:
case Application::ERROR_CONTROLLER_INVALID:
case Application::ERROR_ROUTER_NO_MATCH:
$this->reason = $error;
$response = $e->getResponse();
if (! $response) {
$response = new HttpResponse();
$e->setResponse($response);
}
$response->setStatusCode(404);
break;
default:
return;
}
}
/**
* Create and return a 404 view model
*
* @return void
*/
public function prepareNotFoundViewModel(MvcEvent $e)
{
$vars = $e->getResult();
if ($vars instanceof Response) {
// Already have a response as the result
return;
}
$response = $e->getResponse();
if ($response->getStatusCode() != 404) {
// Only handle 404 responses
return;
}
if (! $vars instanceof ViewModel) {
$model = new ViewModel();
if (is_string($vars)) {
$model->setVariable('message', $vars);
} else {
$model->setVariable('message', 'Page not found.');
}
} else {
$model = $vars;
if ($model->getVariable('message') === null) {
$model->setVariable('message', 'Page not found.');
}
}
$model->setTemplate($this->getNotFoundTemplate());
// If displaying reasons, inject the reason
$this->injectNotFoundReason($model);
// If displaying exceptions, inject
$this->injectException($model, $e);
// Inject controller if we're displaying either the reason or the exception
$this->injectController($model, $e);
$e->setResult($model);
}
/**
* Inject the not-found reason into the model
*
* If $displayNotFoundReason is enabled, checks to see if $reason is set,
* and, if so, injects it into the model. If not, it injects
* Application::ERROR_CONTROLLER_CANNOT_DISPATCH.
*
* @param ViewModel $model
* @return void
*/
protected function injectNotFoundReason(ViewModel $model)
{
if (! $this->displayNotFoundReason()) {
return;
}
// no route match, controller not found, or controller invalid
if ($this->reason) {
$model->setVariable('reason', $this->reason);
return;
}
// otherwise, must be a case of the controller not being able to
// dispatch itself.
$model->setVariable('reason', Application::ERROR_CONTROLLER_CANNOT_DISPATCH);
}
/**
* Inject the exception message into the model
*
* If $displayExceptions is enabled, and an exception is found in the
* event, inject it into the model.
*
* @param ViewModel $model
* @param MvcEvent $e
* @return void
*/
protected function injectException($model, $e)
{
if (! $this->displayExceptions()) {
return;
}
$model->setVariable('display_exceptions', true);
$exception = $e->getParam('exception', false);
// @TODO clean up once PHP 7 requirement is enforced
if (! $exception instanceof Exception && ! $exception instanceof Throwable) {
return;
}
$model->setVariable('exception', $exception);
}
/**
* Inject the controller and controller class into the model
*
* If either $displayExceptions or $displayNotFoundReason are enabled,
* injects the controllerClass from the MvcEvent. It checks to see if a
* controller is present in the MvcEvent, and, if not, grabs it from
* the route match if present; if a controller is found, it injects it into
* the model.
*
* @param ViewModel $model
* @param MvcEvent $e
* @return void
*/
protected function injectController($model, $e)
{
if (! $this->displayExceptions() && ! $this->displayNotFoundReason()) {
return;
}
$controller = $e->getController();
if (empty($controller)) {
$routeMatch = $e->getRouteMatch();
if (empty($routeMatch)) {
return;
}
$controller = $routeMatch->getParam('controller', false);
if (! $controller) {
return;
}
}
$controllerClass = $e->getControllerClass();
$model->setVariable('controller', $controller);
$model->setVariable('controller_class', $controllerClass);
}
}