2020-03-12 05:29:08 +09:00
|
|
|
<?php
|
2020-03-16 06:21:11 +09:00
|
|
|
|
2020-03-12 05:29:08 +09:00
|
|
|
// This file is part of GNU social - https://www.gnu.org/software/social
|
|
|
|
//
|
|
|
|
// GNU social is free software: you can redistribute it and/or modify
|
|
|
|
// it under the terms of the GNU Affero General Public License as published by
|
|
|
|
// the Free Software Foundation, either version 3 of the License, or
|
|
|
|
// (at your option) any later version.
|
|
|
|
//
|
|
|
|
// GNU social is distributed in the hope that it will be useful,
|
|
|
|
// but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
|
|
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
|
|
// GNU Affero General Public License for more details.
|
|
|
|
//
|
|
|
|
// You should have received a copy of the GNU Affero General Public License
|
|
|
|
// along with GNU social. If not, see <http://www.gnu.org/licenses/>.
|
|
|
|
|
|
|
|
namespace App\Util;
|
|
|
|
|
|
|
|
use Symfony\Component\EventDispatcher\EventDispatcherInterface;
|
|
|
|
use Symfony\Component\EventDispatcher\GenericEvent;
|
|
|
|
|
2020-03-16 06:21:11 +09:00
|
|
|
abstract class GSEvent
|
|
|
|
{
|
2020-03-12 05:29:08 +09:00
|
|
|
/**
|
|
|
|
* Constants to be returned from event handlers, for increased clarity
|
|
|
|
*
|
|
|
|
* bool stop - Stop other handlers from processing the event
|
|
|
|
* bool next - Allow the other handlers to process the event
|
|
|
|
*/
|
|
|
|
public const stop = false;
|
2020-03-16 06:21:11 +09:00
|
|
|
|
2020-03-12 05:29:08 +09:00
|
|
|
public const next = true;
|
|
|
|
|
2020-03-16 06:21:11 +09:00
|
|
|
private static EventDispatcherInterface $dispatcher;
|
|
|
|
|
|
|
|
public static function setDispatcher(EventDispatcherInterface $dis): void
|
|
|
|
{
|
|
|
|
self::$dispatcher = $dis;
|
|
|
|
}
|
2020-03-12 05:29:08 +09:00
|
|
|
|
|
|
|
/**
|
|
|
|
* Add an event handler
|
|
|
|
*
|
|
|
|
* To run some code at a particular point in GNU social processing.
|
|
|
|
* Named events include receiving an XMPP message, adding a new notice,
|
|
|
|
* or showing part of an HTML page.
|
|
|
|
*
|
|
|
|
* The arguments to the handler vary by the event. Handlers can return
|
|
|
|
* two possible values: false means that the event has been replaced by
|
|
|
|
* the handler completely, and no default processing should be done.
|
|
|
|
* Non-false means successful handling, and that the default processing
|
|
|
|
* should succeed. (Note that this only makes sense for some events.)
|
|
|
|
*
|
|
|
|
* Handlers can also abort processing by throwing an exception; these will
|
|
|
|
* be caught by the closest code and displayed as errors.
|
|
|
|
*
|
|
|
|
* @param string $name Name of the event
|
|
|
|
* @param callable $handler Code to run
|
|
|
|
* @param int $priority Higher runs first
|
|
|
|
*
|
|
|
|
* @return void
|
|
|
|
*/
|
2020-03-16 06:21:11 +09:00
|
|
|
public static function addHandler(string $name, callable $handler, int $priority = 0): void
|
2020-03-12 05:29:08 +09:00
|
|
|
{
|
|
|
|
self::$dispatcher->addListener(
|
|
|
|
$name,
|
|
|
|
function ($event, $event_name, $dispatcher) use ($handler) {
|
2020-03-21 07:10:01 +09:00
|
|
|
// Old style of events (preferred)
|
|
|
|
if ($event instanceof GenericEvent) {
|
|
|
|
if (call_user_func_array($handler, $event->getArguments()) == self::stop) {
|
|
|
|
$event->stopPropagation();
|
|
|
|
}
|
2020-03-12 05:29:08 +09:00
|
|
|
return $event;
|
|
|
|
}
|
2020-03-16 06:21:11 +09:00
|
|
|
// Symfony style of events
|
|
|
|
call_user_func($handler, $event, $event_name, $dispatcher);
|
|
|
|
|
2020-03-12 05:29:08 +09:00
|
|
|
return null;
|
|
|
|
},
|
|
|
|
$priority
|
|
|
|
);
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* Handle an event
|
|
|
|
*
|
|
|
|
* Events are any point in the code that we want to expose for admins
|
|
|
|
* or third-party developers to use.
|
|
|
|
*
|
|
|
|
* We pass in an array of arguments (including references, for stuff
|
|
|
|
* that can be changed), and each assigned handler gets run with those
|
|
|
|
* arguments. Exceptions can be thrown to indicate an error.
|
|
|
|
*
|
|
|
|
* @param string $name Name of the event that's happening
|
|
|
|
* @param array $args Arguments for handlers
|
|
|
|
*
|
|
|
|
* @return bool flag saying whether to continue processing, based
|
2020-03-16 06:21:11 +09:00
|
|
|
* on results of handlers.
|
2020-03-12 05:29:08 +09:00
|
|
|
*/
|
|
|
|
public static function handle(string $name, array $args = []): bool
|
|
|
|
{
|
|
|
|
return !(self::$dispatcher->dispatch(
|
|
|
|
new GenericEvent($name, $args),
|
|
|
|
$name)->isPropagationStopped());
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* Check to see if an event handler exists
|
|
|
|
*
|
|
|
|
* Look to see if there's any handler for a given event, or narrow
|
|
|
|
* by providing the name of a specific plugin class.
|
|
|
|
*
|
2020-03-16 06:21:11 +09:00
|
|
|
* @param string $name Name of the event to look for
|
2020-03-12 05:29:08 +09:00
|
|
|
* @param string $plugin Optional name of the plugin class to look for
|
|
|
|
*
|
|
|
|
* @return bool flag saying whether such a handler exists
|
|
|
|
*/
|
2020-03-16 06:21:11 +09:00
|
|
|
public static function hasHandler(string $name, ?string $plugin = null): bool
|
2020-03-12 05:29:08 +09:00
|
|
|
{
|
|
|
|
$listeners = self::$dispatcher->getListeners($name);
|
|
|
|
if (isset($plugin)) {
|
|
|
|
foreach ($listeners as $handler) {
|
2020-03-16 06:21:11 +09:00
|
|
|
if (\get_class($handler[0]) == $plugin) {
|
2020-03-12 05:29:08 +09:00
|
|
|
return true;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
} else {
|
|
|
|
return !empty($listeners);
|
|
|
|
}
|
|
|
|
return false;
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* Get the array of handlers for $name
|
|
|
|
*
|
|
|
|
* @param string $name Name of event
|
2020-03-16 06:21:11 +09:00
|
|
|
*
|
2020-03-12 05:29:08 +09:00
|
|
|
* @return array
|
|
|
|
* @return array
|
|
|
|
*/
|
|
|
|
public static function getHandlers(string $name): array
|
|
|
|
{
|
|
|
|
return self::$dispatcher->getListeners($name);
|
|
|
|
}
|
|
|
|
}
|