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<?php
/*
* This file is part of the TYPO3 CMS project.
*
* It is free software; you can redistribute it and/or modify it under
* the terms of the GNU General Public License, either version 2
* of the License, or any later version.
*
* For the full copyright and license information, please read the
* LICENSE.txt file that was distributed with this source code.
*
* The TYPO3 project - inspiring people to share!
*/
namespace TYPO3\CMS\Core\LinkHandling;
/**
* Resolves URLs (simple, no magic needed)
*/
class UrlLinkHandler implements LinkHandlingInterface
{
/**
* Returns the URL as given
*/
public function asString(array $parameters): string
{
return $this->addHttpSchemeAsFallback($parameters['url']);
}
/**
* Returns the URL as is
*
* @param array $data (needs 'url') inside
*/
public function resolveHandlerData(array $data): array
{
return ['url' => $this->addHttpSchemeAsFallback($data['url'])];
}
/**
* Ensures that a scheme is always added, if www.typo3.org was added previously.
*
* @param string $url the URL
*/
protected function addHttpSchemeAsFallback(string $url): string
{
if (!empty($url)) {
// We expect this an absolute path, and leave as is. We also leave double slashes ('//') as is.
if (str_starts_with($url, '/')) {
return $url;
}
$scheme = parse_url($url, PHP_URL_SCHEME);
if (empty($scheme)) {
$url = self::getDefaultScheme() . '://' . $url;
} elseif (in_array(strtolower($scheme), ['javascript', 'data'], true)) {
// deny using insecure scheme's like `javascript:` or `data:` as URL scheme
$url = '';
}
}
return $url;
}
/**
* Returns the scheme (e.g. `http`) to be used for links with URLs without a scheme, e.g., for `www.example.com`.
*
* @return non-empty-string
*/
public static function getDefaultScheme(): string
{
return ($GLOBALS['TYPO3_CONF_VARS']['SYS']['defaultScheme'] ?? '')
?: LinkHandlingInterface::DEFAULT_SCHEME;
}
}