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typo3conf/ext/vhs/Classes/ViewHelpers/Security/AllowViewHelper.php

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+<?php
+namespace FluidTYPO3\Vhs\ViewHelpers\Security;
+
+/*
+ * 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\Fluid\Core\ViewHelper\Facets\ChildNodeAccessInterface;
+
+/**
+ * ### Security: Allow
+ *
+ * Allows access to the child content based on given arguments.
+ * The ViewHelper is a condition based ViewHelper which means it
+ * supports the `f:then` and `f:else` child nodes - you can use
+ * this behaviour to invert the access (i.e. use f:else in a check
+ * if a frontend user is logged in, if you want to hide content
+ * from authenticated users):
+ *
+ *     <v:security.allow anyFrontendUser="TRUE">
+ *         <f:then><!-- protected information displayed --></f:then>
+ *         <f:else><!-- link to login form displayed --></f:else>
+ *     </v:security.allow>
+ *
+ * Is the mirror opposite of `v:security.deny`.
+ *
+ * @author Claus Due
+ * @package Vhs
+ * @subpackage ViewHelpers\Security
+ */
+class AllowViewHelper extends AbstractSecurityViewHelper implements ChildNodeAccessInterface {
+
+	/**
+	 * Render allow - i.e. render "then" child if arguments are satisfied
+	 *
+	 * @return string
+	 */
+	public function render() {
+		$evaluation = $this->evaluateArguments();
+		if (TRUE === $evaluation) {
+			return $this->renderThenChild();
+		} else {
+			return $this->renderElseChild();
+		}
+	}
+
+}