Respect custom webroot in setup form

Signed-off-by: HolonProduction <holonproduction@gmail.com>

core/Controller/SetupController.php

@@ -32,6 +32,7 @@
 namespace OC\Core\Controller;
 
 use OC\Setup;
+use OCP\IURLGenerator;
 use Psr\Log\LoggerInterface;
 
 class SetupController {
@@ -40,6 +41,7 @@ class SetupController {
 	public function __construct(
 		protected Setup $setupHelper,
 		protected LoggerInterface $logger,
+		private IURLGenerator $urlGenerator,
 	) {
 		$this->autoConfigFile = \OC::$configDir.'autoconfig.php';
 	}
@@ -93,6 +95,7 @@ public function display($post): void {
 			'dbtablespace' => '',
 			'dbhost' => 'localhost',
 			'dbtype' => '',
+			'urlGenerator' => $this->urlGenerator,
 		];
 		$parameters = array_merge($defaults, $post);
 

core/templates/installation.php

@@ -1,11 +1,13 @@
 <?php
 script('core', 'install');
+
+$urlGenerator = $_['urlGenerator'];
 ?>
 <input type='hidden' id='hasMySQL' value='<?php p($_['hasMySQL']) ?>'>
 <input type='hidden' id='hasSQLite' value='<?php p($_['hasSQLite']) ?>'>
 <input type='hidden' id='hasPostgreSQL' value='<?php p($_['hasPostgreSQL']) ?>'>
 <input type='hidden' id='hasOracle' value='<?php p($_['hasOracle']) ?>'>
-<form action="index.php" method="post" class="guest-box install-form">
+<form action="<?php $urlGenerator->getAbsoluteURL("index.php") ?>" method="post" class="guest-box install-form">
 <input type="hidden" name="install" value="true">
 	<?php if (count($_['errors']) > 0): ?>
 	<fieldset class="warning">

lib/base.php

@@ -998,7 +998,7 @@ public static function handleRequest(): void {
 				Server::get(\OCP\Security\ISecureRandom::class),
 				Server::get(\OC\Installer::class)
 			);
-			$controller = new OC\Core\Controller\SetupController($setupHelper, $logger);
+			$controller = new OC\Core\Controller\SetupController($setupHelper, $logger, Server::get(\OCP\IURLGenerator::class));
 			$controller->run($_POST);
 			exit();
 		}