Initial commit

typo3conf/ext/vhs/Classes/ViewHelpers/Media/ExistsViewHelper.php

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+<?php
+namespace FluidTYPO3\Vhs\ViewHelpers\Media;
+
+/*
+ * This file is part of the FluidTYPO3/Vhs project under GPLv2 or later.
+ *
+ * For the full copyright and license information, please read the
+ * LICENSE.md file that was distributed with this source code.
+ */
+
+use TYPO3\CMS\Core\Utility\GeneralUtility;
+use TYPO3\CMS\Fluid\Core\ViewHelper\AbstractConditionViewHelper;
+use TYPO3\CMS\Fluid\Core\ViewHelper\AbstractViewHelper;
+
+/**
+ * File/Directory Exists Condition ViewHelper
+ *
+ * @author Claus Due <claus@namelesscoder.net>
+ * @package Vhs
+ * @subpackage ViewHelpers\Media
+ */
+class ExistsViewHelper extends AbstractConditionViewHelper {
+
+	/**
+	 * Initialize arguments
+	 *
+	 * @return void
+	 */
+	public function initializeArguments() {
+		parent::initializeArguments();
+		$this->registerArgument('file', 'string', 'Filename which must exist to trigger f:then rendering', FALSE);
+		$this->registerArgument('directory', 'string', 'Directory which must exist to trigger f:then rendering', FALSE);
+	}
+
+	/**
+	 * Render method
+	 *
+	 * @return string
+	 */
+	public function render() {
+
+		$evaluation = static::evaluateCondition($this->arguments);
+
+		if (FALSE !== $evaluation) {
+			return $this->renderThenChild();
+		}
+		return $this->renderElseChild();
+	}
+
+	/**
+	 * This method decides if the condition is TRUE or FALSE. It can be overriden in extending viewhelpers to adjust functionality.
+	 *
+	 * @param array $arguments ViewHelper arguments to evaluate the condition for this ViewHelper, allows for flexiblity in overriding this method.
+	 * @return bool
+	 */
+	static protected function evaluateCondition($arguments = NULL) {
+		$file = GeneralUtility::getFileAbsFileName($arguments['file']);
+		$directory = $arguments['directory'];
+		$evaluation = FALSE;
+		if (TRUE === isset($arguments['file'])) {
+			$evaluation = (boolean) ((TRUE === file_exists($file) || TRUE === file_exists(constant('PATH_site') . $file)) && TRUE === is_file($file));
+		} elseif (TRUE === isset($arguments['directory'])) {
+			$evaluation = (boolean) (TRUE === is_dir($directory) || TRUE === is_dir(constant('PATH_site') . $directory));
+		}
+		return $evaluation;
+	}
+
+}