Move email confirmation to POST request (#3038)

* Add blade view to confirm email flow, move actual confirmation to POST request

* Apply fixes from StyleCI

[ci skip] [skip ci]

Co-authored-by: datitisev <datitisev@users.noreply.github.com>

src/Forum/Controller/ConfirmEmailViewController.php

@@ -0,0 +1,46 @@
+<?php
+
+/*
+ * This file is part of Flarum.
+ *
+ * For detailed copyright and license information, please view the
+ * LICENSE file that was distributed with this source code.
+ */
+
+namespace Flarum\Forum\Controller;
+
+use Flarum\Http\Controller\AbstractHtmlController;
+use Flarum\User\EmailToken;
+use Illuminate\Contracts\View\Factory;
+use Illuminate\Support\Arr;
+use Psr\Http\Message\ServerRequestInterface as Request;
+
+class ConfirmEmailViewController extends AbstractHtmlController
+{
+    /**
+     * @var Factory
+     */
+    protected $view;
+
+    /**
+     * @param Factory $view
+     */
+    public function __construct(Factory $view)
+    {
+        $this->view = $view;
+    }
+
+    /**
+     * @param Request $request
+     * @return \Illuminate\Contracts\View\View
+     */
+    public function render(Request $request)
+    {
+        $token = Arr::get($request->getQueryParams(), 'token');
+
+        $token = EmailToken::validOrFail($token);
+
+        return $this->view->make('flarum.forum::confirm-email')
+            ->with('csrfToken', $request->getAttribute('session')->token());
+    }
+}

src/Forum/routes.php

@@ -64,7 +64,13 @@ return function (RouteCollection $map, RouteHandlerFactory $route) {
     $map->get(
         '/confirm/{token}',
         'confirmEmail',
-        $route->toController(Controller\ConfirmEmailController::class)
+        $route->toController(Controller\ConfirmEmailViewController::class),
+    );
+
+    $map->post(
+        '/confirm/{token}',
+        'confirmEmail.submit',
+        $route->toController(Controller\ConfirmEmailController::class),
     );
 
     $map->get(