Use Symfony's new contract Event class instead of the deprecated one

Signed-off-by: Christoph Wurst <christoph@winzerhof-wurst.at>

3rdparty

-Subproject commit 3cf032e948177e2dba40a828aa67d35175cf4bcd
+Subproject commit 4a0dc8066bde4ca5641a740e304f9a5403a5952e

lib/private/Authentication/TwoFactorAuth/Registry.php

 use OCP\Authentication\TwoFactorAuth\IProvider;
 use OCP\Authentication\TwoFactorAuth\IRegistry;
 use OCP\Authentication\TwoFactorAuth\RegistryEvent;
+use OCP\EventDispatcher\IEventDispatcher;
 use OCP\IUser;
-use Symfony\Component\EventDispatcher\EventDispatcherInterface;
-use Symfony\Component\EventDispatcher\GenericEvent;
 
 class Registry implements IRegistry {
 
 	/** @var ProviderUserAssignmentDao */
 	private $assignmentDao;
 
-	/** @var EventDispatcherInterface */
+	/** @var IEventDispatcher */
 	private $dispatcher;
 
 	public function __construct(ProviderUserAssignmentDao $assignmentDao,
-								EventDispatcherInterface $dispatcher) {
+								IEventDispatcher $dispatcher) {
 		$this->assignmentDao = $assignmentDao;
 		$this->dispatcher = $dispatcher;
 	}

lib/public/EventDispatcher/Event.php

 
 namespace OCP\EventDispatcher;
 
-use Symfony\Component\EventDispatcher\GenericEvent;
+use Symfony\Contracts\EventDispatcher\Event as SymfonyEvent;
 
 /**
  * Base event class for the event dispatcher service
  *
  * @since 17.0.0
  */
-class Event extends GenericEvent {
+class Event extends SymfonyEvent {
+
+	/**
+	 * Compatibility constructor
+	 *
+	 * In Nextcloud 17.0.0 this event class used a now deprecated/removed Symfony base
+	 * class that had a constructor (with default arguments). To lower the risk of
+	 * a breaking change (PHP won't allow parent constructor calls if there is none),
+	 * this empty constructor's only purpose is to hopefully not break existing sub-
+	 * classes of this class.
+	 *
+	 * @since 18.0.0
+	 */
+	public function __construct() {
+	}
 
 }

lib/public/Security/CSP/AddContentSecurityPolicyEvent.php

 	 * @since 17.0.0
 	 */
 	public function __construct(ContentSecurityPolicyManager $policyManager) {
+		parent::__construct();
 		$this->policyManager = $policyManager;
 	}
 

lib/public/Security/FeaturePolicy/AddFeaturePolicyEvent.php

 	 * @since 17.0.0
 	 */
 	public function __construct(FeaturePolicyManager $policyManager) {
+		parent::__construct();
 		$this->policyManager = $policyManager;
 	}
 

tests/lib/Authentication/TwoFactorAuth/RegistryTest.php

-<?php
+<?php declare(strict_types=1);
 
 /**
  * @copyright 2018 Christoph Wurst <christoph@winzerhof-wurst.at>
 use OCP\Authentication\TwoFactorAuth\IProvider;
 use OCP\Authentication\TwoFactorAuth\IRegistry;
 use OCP\Authentication\TwoFactorAuth\RegistryEvent;
+use OCP\EventDispatcher\IEventDispatcher;
 use OCP\IUser;
-use PHPUnit_Framework_MockObject_MockObject;
-use Symfony\Component\EventDispatcher\EventDispatcherInterface;
+use PHPUnit\Framework\MockObject\MockObject;
 use Test\TestCase;
 
 class RegistryTest extends TestCase {
 
-	/** @var ProviderUserAssignmentDao|PHPUnit_Framework_MockObject_MockObject */
+	/** @var ProviderUserAssignmentDao|MockObject */
 	private $dao;
 
+	/** @var IEventDispatcher|MockObject */
+	private $dispatcher;
+
 	/** @var Registry */
 	private $registry;
 
-	/** @var EventDispatcherInterface|\PHPUnit_Framework_MockObject_MockObject */
-	private $dispatcher;
-
 	protected function setUp() {
 		parent::setUp();
 
 		$this->dao = $this->createMock(ProviderUserAssignmentDao::class);
-		$this->dispatcher = $this->createMock(EventDispatcherInterface::class);
+		$this->dispatcher = $this->createMock(IEventDispatcher::class);
 
 		$this->registry = new Registry($this->dao, $this->dispatcher);
 	}