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<?php
namespace Laminas\Mvc\Controller\Plugin;
use Traversable;
use Laminas\Mvc\Exception\DomainException;
use Laminas\EventManager\SharedEventManagerInterface as SharedEvents;
use Laminas\Mvc\Controller\ControllerManager;
use Laminas\Mvc\Exception;
use Laminas\Mvc\InjectApplicationEventInterface;
use Laminas\Mvc\MvcEvent;
use Laminas\Router\RouteMatch;
use Laminas\Stdlib\CallbackHandler;
class Forward extends AbstractPlugin
{
/**
* @var MvcEvent
*/
protected $event;
/**
* @var int
*/
protected $maxNestedForwards = 10;
/**
* @var int
*/
protected $numNestedForwards = 0;
/**
* @var array[]|null
*/
protected $listenersToDetach = null;
public function __construct(protected ControllerManager $controllers)
{
}
/**
* Set maximum number of nested forwards allowed
*
* @param int $maxNestedForwards
* @return self
*/
public function setMaxNestedForwards($maxNestedForwards)
{
$this->maxNestedForwards = (int) $maxNestedForwards;
return $this;
}
/**
* Get information on listeners that need to be detached before dispatching.
*
* Each entry in the array contains three keys:
*
* id (identifier for event-emitting component),
* event (the hooked event)
* and class (the class of listener that should be detached).
*
* @return array
*/
public function getListenersToDetach()
{
// If a blacklist has not been explicitly set, return the default:
if (null === $this->listenersToDetach) {
// We need to detach the InjectViewModelListener to prevent templates
// from getting attached to the ViewModel twice when a calling action
// returns the output generated by a forwarded action.
$this->listenersToDetach = [[
'id' => 'Laminas\Stdlib\DispatchableInterface',
'event' => MvcEvent::EVENT_DISPATCH,
'class' => 'Laminas\Mvc\View\Http\InjectViewModelListener',
]];
}
return $this->listenersToDetach;
}
/**
* Set information on listeners that need to be detached before dispatching.
*
* @param array $listeners Listener information; see getListenersToDetach() for details on format.
*
* @return self
*/
public function setListenersToDetach($listeners)
{
$this->listenersToDetach = $listeners;
return $this;
}
/**
* Dispatch another controller
*
* @param string $name Controller name; either a class name or an alias used in the controller manager
* @param null|array $params Parameters with which to seed a custom RouteMatch object for the new controller
* @return mixed
* @throws Exception\DomainException if composed controller does not define InjectApplicationEventInterface
* or Locator aware; or if the discovered controller is not dispatchable
*/
public function dispatch($name, array $params = null)
{
$event = clone($this->getEvent());
$controller = $this->controllers->get($name);
if ($controller instanceof InjectApplicationEventInterface) {
$controller->setEvent($event);
}
// Allow passing parameters to seed the RouteMatch with & copy matched route name
if ($params !== null) {
$routeMatch = new RouteMatch($params);
$routeMatch->setMatchedRouteName($event->getRouteMatch()->getMatchedRouteName());
$event->setRouteMatch($routeMatch);
}
if ($this->numNestedForwards > $this->maxNestedForwards) {
throw new DomainException(
"Circular forwarding detected: greater than $this->maxNestedForwards nested forwards"
);
}
$this->numNestedForwards++;
// Detach listeners that may cause problems during dispatch:
$sharedEvents = $event->getApplication()->getEventManager()->getSharedManager();
$listeners = $this->detachProblemListeners($sharedEvents);
$return = $controller->dispatch($event->getRequest(), $event->getResponse());
// If we detached any listeners, reattach them now:
$this->reattachProblemListeners($sharedEvents, $listeners);
$this->numNestedForwards--;
return $return;
}
/**
* Detach problem listeners specified by getListenersToDetach() and return an array of information that will
* allow them to be reattached.
*
* @param SharedEvents $sharedEvents Shared event manager
* @return array
*/
protected function detachProblemListeners(SharedEvents $sharedEvents)
{
// Convert the problem list from two-dimensional array to more convenient id => event => class format:
$formattedProblems = [];
foreach ($this->getListenersToDetach() as $current) {
if (! isset($formattedProblems[$current['id']])) {
$formattedProblems[$current['id']] = [];
}
if (! isset($formattedProblems[$current['id']][$current['event']])) {
$formattedProblems[$current['id']][$current['event']] = [];
}
$formattedProblems[$current['id']][$current['event']][] = $current['class'];
}
// Loop through the class blacklist, detaching problem events and remembering their CallbackHandlers
// for future reference:
$results = [];
foreach ($formattedProblems as $id => $eventArray) {
$results[$id] = [];
foreach ($eventArray as $eventName => $classArray) {
$results[$id][$eventName] = [];
$events = $this->getSharedListenersById($id, $eventName, $sharedEvents);
foreach ($events as $priority => $currentPriorityEvents) {
foreach ($currentPriorityEvents as $currentEvent) {
$currentCallback = $currentEvent;
// If we have an array, grab the object
if (is_array($currentCallback)) {
$currentCallback = array_shift($currentCallback);
}
// This routine is only valid for object callbacks
if (! is_object($currentCallback)) {
continue;
}
foreach ($classArray as $class) {
if ($currentCallback instanceof $class) {
$this->detachSharedListener($id, $currentEvent, $sharedEvents);
$results[$id][$eventName][$priority] = $currentEvent;
}
}
}
}
}
}
return $results;
}
/**
* Reattach all problem listeners detached by detachProblemListeners(), if any.
*
* @param SharedEvents $sharedEvents Shared event manager
* @param array $listeners Output of detachProblemListeners()
* @return void
*/
protected function reattachProblemListeners(SharedEvents $sharedEvents, array $listeners)
{
foreach ($listeners as $id => $eventArray) {
foreach ($eventArray as $eventName => $callbacks) {
foreach ($callbacks as $priority => $current) {
$callback = $current;
$sharedEvents->attach($id, $eventName, $callback, $priority);
}
}
}
}
/**
* Get the event
*
* @return MvcEvent
* @throws Exception\DomainException if unable to find event
*/
protected function getEvent()
{
if ($this->event) {
return $this->event;
}
$controller = $this->getController();
if (! $controller instanceof InjectApplicationEventInterface) {
throw new DomainException(sprintf(
'Forward plugin requires a controller that implements InjectApplicationEventInterface; received %s',
(is_object($controller) ? $controller::class : var_export($controller, 1))
));
}
$event = $controller->getEvent();
if (! $event instanceof MvcEvent) {
$params = [];
if ($event) {
$params = $event->getParams();
}
$event = new MvcEvent();
$event->setParams($params);
}
$this->event = $event;
return $this->event;
}
/**
* Retrieve shared listeners for an event by identifier.
*
* Varies retrieval based on laminas-eventmanager version.
*
* @param string|int $id
* @param string $event
* @param SharedEvents $sharedEvents
* @return array|Traversable
*/
private function getSharedListenersById($id, $event, SharedEvents $sharedEvents)
{
return $sharedEvents->getListeners([$id], $event);
}
/**
* Detach a shared listener by identifier.
*
* Varies detachment based on laminas-eventmanager version.
*
* @param string|int $id
* @param callable|CallbackHandler $listener
* @param SharedEvents $sharedEvents
* @return void
*/
private function detachSharedListener($id, $listener, SharedEvents $sharedEvents)
{
$sharedEvents->detach($listener, $id);
}
}