forked from GNUsocial/gnu-social
163 lines
5.6 KiB
PHP
163 lines
5.6 KiB
PHP
<?php
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// {{{ License
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// This file is part of GNU social - https://www.gnu.org/software/social
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//
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// GNU social is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Affero General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// GNU social is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Affero General Public License for more details.
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//
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// You should have received a copy of the GNU Affero General Public License
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// along with GNU social. If not, see <http://www.gnu.org/licenses/>.
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// }}}
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/**
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* GNU social's event handler wrapper around Symfony's,
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* keeping our old interface, which is more convenient and just as powerful
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*
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* @package GNUsocial
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* @category Event
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*
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* @author Hugo Sales <hugo@fc.up.pt>
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* @copyright 2020 Free Software Foundation, Inc http://www.fsf.org
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* @license https://www.gnu.org/licenses/agpl.html GNU AGPL v3 or later
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*/
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namespace App\Core;
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use Symfony\Component\EventDispatcher\EventDispatcherInterface;
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use Symfony\Component\EventDispatcher\GenericEvent;
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abstract class Event
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{
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/**
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* Constants to be returned from event handlers, for increased clarity
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*
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* bool stop - Stop other handlers from processing the event
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* bool next - Allow the other handlers to process the event
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*/
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public const stop = false;
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public const next = true;
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private static EventDispatcherInterface $dispatcher;
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public static function setDispatcher(EventDispatcherInterface $dis): void
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{
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self::$dispatcher = $dis;
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}
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/**
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* Add an event handler
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*
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* To run some code at a particular point in GNU social processing.
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* Named events include receiving an XMPP message, adding a new notice,
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* or showing part of an HTML page.
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*
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* The arguments to the handler vary by the event. Handlers can return
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* two possible values: false means that the event has been replaced by
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* the handler completely, and no default processing should be done.
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* Non-false means successful handling, and that the default processing
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* should succeed. (Note that this only makes sense for some events.)
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*
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* Handlers can also abort processing by throwing an exception; these will
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* be caught by the closest code and displayed as errors.
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*
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* @param string $name Name of the event
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* @param callable $handler Code to run
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* @param int $priority Higher runs first
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* @param string $ns
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*
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* @return void
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*/
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public static function addHandler(string $name,
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callable $handler,
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int $priority = 0,
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string $ns = 'GNUsocial/'): void
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{
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self::$dispatcher->addListener(
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$ns . $name,
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function ($event, $event_name, $dispatcher) use ($handler) {
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// Old style of events (preferred)
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if ($event instanceof GenericEvent) {
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if (call_user_func_array($handler, $event->getArguments()) == self::stop) {
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$event->stopPropagation();
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}
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return $event;
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}
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// Symfony style of events
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call_user_func($handler, $event, $event_name, $dispatcher);
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return null;
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},
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$priority
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);
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}
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/**
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* Handle an event
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*
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* Events are any point in the code that we want to expose for admins
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* or third-party developers to use.
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*
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* We pass in an array of arguments (including references, for stuff
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* that can be changed), and each assigned handler gets run with those
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* arguments. Exceptions can be thrown to indicate an error.
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*
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* @param string $name Name of the event that's happening
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* @param array $args Arguments for handlers
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* @param string $ns Namspace for the event
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*
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* @return bool flag saying whether to continue processing, based
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* on results of handlers.
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*/
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public static function handle(string $name, array $args = [], string $ns = 'GNUsocial/'): bool
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{
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return !(self::$dispatcher->dispatch(new GenericEvent($ns . $name, $args), $name)->isPropagationStopped());
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}
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/**
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* Check to see if an event handler exists
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*
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* Look to see if there's any handler for a given event, or narrow
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* by providing the name of a specific plugin class.
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*
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* @param string $name Name of the event to look for
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* @param string $plugin Optional name of the plugin class to look for
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*
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* @return bool flag saying whether such a handler exists
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*/
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public static function hasHandler(string $name, ?string $plugin = null): bool
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{
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$listeners = self::$dispatcher->getListeners($name);
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if (isset($plugin)) {
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foreach ($listeners as $handler) {
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if (get_class($handler[0]) == $plugin) {
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return true;
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}
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}
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} else {
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return !empty($listeners);
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}
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return false;
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}
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/**
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* Get the array of handlers for $name
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*
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* @param string $name Name of event
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*
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* @return array
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* @return array
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*/
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public static function getHandlers(string $name): array
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{
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return self::$dispatcher->getListeners($name);
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}
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}
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