ExternalViewHelper.php

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

/*                                                                        *
 * This script is backported from the TYPO3 Flow package "TYPO3.Fluid".   *
 *                                                                        *
 * It is free software; you can redistribute it and/or modify it under    *
 * the terms of the GNU Lesser General Public License, either version 3   *
 *  of the License, or (at your option) any later version.                *
 *                                                                        *
 * The TYPO3 project - inspiring people to share!                         *
 *                                                                        */

use TYPO3\CMS\Fluid\Core\Rendering\RenderingContextInterface;
use TYPO3\CMS\Fluid\Core\ViewHelper\AbstractViewHelper;
use TYPO3\CMS\Fluid\Core\ViewHelper\Facets\CompilableInterface;

class ExternalViewHelper extends AbstractViewHelper implements CompilableInterface
{
    public function render($uri, $defaultScheme = 'http')
    {
        return static::renderStatic(
            [
                'uri' => $uri,
                'defaultScheme' => $defaultScheme
            ],
            $this->buildRenderChildrenClosure(),
            $this->renderingContext
        );
    }

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

        $scheme = parse_url($uri, PHP_URL_SCHEME);
        if ($scheme === null && $defaultScheme !== '') {
            $uri = $defaultScheme . '://' . $uri;
        }
        return $uri;
    }
}