ResourceViewHelper.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\Facets\CompilableInterface;

class ResourceViewHelper extends \TYPO3\CMS\Fluid\Core\ViewHelper\AbstractViewHelper implements CompilableInterface
{
    public function render($path, $extensionName = null, $absolute = false)
    {
        return static::renderStatic(
            array(
                'path' => $path,
                'extensionName' => $extensionName,
                'absolute' => $absolute
            ),
            $this->buildRenderChildrenClosure(),
            $this->renderingContext
        );
    }

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

        if ($extensionName === null) {
            $extensionName = $renderingContext->getControllerContext()->getRequest()->getControllerExtensionName();
        }
        $uri = 'EXT:' . GeneralUtility::camelCaseToLowerCaseUnderscored($extensionName) . '/Resources/Public/' . $path;
        $uri = GeneralUtility::getFileAbsFileName($uri);
        $uri = \TYPO3\CMS\Core\Utility\PathUtility::stripPathSitePrefix($uri);
        if (TYPO3_MODE === 'BE' && $absolute === false && $uri !== false) {
            $uri = '../' . $uri;
        }
        if ($absolute === true) {
            $uri = $renderingContext->getControllerContext()->getRequest()->getBaseUri() . $uri;
        }
        return $uri;
    }
}