Uri/TypolinkViewHelper.php

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<?php
namespace TYPO3\CMS\Fluid\ViewHelpers\Uri;

/*                                                                        *
 * This script is part of the TYPO3 project - inspiring people to share!  *
 *                                                                        *
 * TYPO3 is free software; you can redistribute it and/or modify it under *
 * the terms of the GNU General Public License version 2 as published by  *
 * the Free Software Foundation.                                          *
 *                                                                        *
 * This script is distributed in the hope that it will be useful, but     *
 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHAN-    *
 * TABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General      *
 * Public License for more details.                                       *
 *                                                                        */

use TYPO3\CMS\Core\Utility\GeneralUtility;
use TYPO3\CMS\Fluid\Core\Rendering\RenderingContextInterface;
use TYPO3\CMS\Fluid\Core\ViewHelper\AbstractViewHelper;
use TYPO3\CMS\Fluid\Core\ViewHelper\Facets\CompilableInterface;
use TYPO3\CMS\Frontend\ContentObject\ContentObjectRenderer;
use TYPO3\CMS\Frontend\Service\TypoLinkCodecService;

class TypolinkViewHelper extends AbstractViewHelper implements CompilableInterface
{
    public function render($parameter, $additionalParams = '')
    {
        return static::renderStatic(
            array(
                'parameter' => $parameter,
                'additionalParams' => $additionalParams
            ),
            $this->buildRenderChildrenClosure(),
            $this->renderingContext
        );
    }

    public static function renderStatic(array $arguments, \Closure $renderChildrenClosure, RenderingContextInterface $renderingContext)
    {
        $parameter = $arguments['parameter'];
        $additionalParams = $arguments['additionalParams'];

        $content = '';
        if ($parameter) {
            $contentObject = GeneralUtility::makeInstance(ContentObjectRenderer::class);
            $content = $contentObject->typoLink_URL(
                array(
                    'parameter' => self::createTypolinkParameterArrayFromArguments($parameter, $additionalParams),
                )
            );
        }

        return $content;
    }

    protected static function createTypolinkParameterArrayFromArguments($parameter, $additionalParameters = '')
    {
        $typoLinkCodec = GeneralUtility::makeInstance(TypoLinkCodecService::class);
        $typolinkConfiguration = $typoLinkCodec->decode($parameter);
        if (empty($typolinkConfiguration)) {
            return $typolinkConfiguration;
        }

        // Combine additionalParams
        if ($additionalParameters) {
            $typolinkConfiguration['additionalParams'] .= $additionalParameters;
        }

        return $typoLinkCodec->encode($typolinkConfiguration);
    }
}