DownloadExtensionViewHelper.php

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<?php
namespace TYPO3\CMS\Extensionmanager\ViewHelpers;

class DownloadExtensionViewHelper extends \TYPO3\CMS\Fluid\ViewHelpers\FormViewHelper {

    protected $tagName = 'form';

    public function render(\TYPO3\CMS\Extensionmanager\Domain\Model\Extension $extension) {
        $installPaths = \TYPO3\CMS\Extensionmanager\Domain\Model\Extension::returnAllowedInstallPaths();
        if (empty($installPaths)) {
            return '';
        }
        $pathSelector = '<ul class="is-hidden">';
        foreach ($installPaths as $installPathType => $installPath) {
            $pathSelector .= '<li>
                <input type="radio" id="' . htmlspecialchars($extension->getExtensionKey()) . '-downloadPath-' . htmlspecialchars($installPathType) . '" name="' . htmlspecialchars($this->getFieldNamePrefix('downloadPath')) . '[downloadPath]" class="downloadPath" value="' . htmlspecialchars($installPathType) . '"' . ($installPathType == 'Local' ? ' checked="checked"' : '') . '/>
                <label for="' . htmlspecialchars($extension->getExtensionKey()) . '-downloadPath-' . htmlspecialchars($installPathType) . '">' . htmlspecialchars($installPathType) . '</label>
            </li>';
        }
        $pathSelector .= '</ul>';
        $uriBuilder = $this->controllerContext->getUriBuilder();
        $action = 'checkDependencies';
        $uriBuilder->reset();
        $uriBuilder->setFormat('json');
        $uri = $uriBuilder->uriFor($action, array(
            'extension' => (int)$extension->getUid()
        ), 'Download');
        $this->tag->addAttribute('data-href', $uri);

        // @TODO Clean-up
        $iconClasses = "t3-icon t3-icon-actions t3-icon-system-extension-import";
        $label = '<input title="' . \TYPO3\CMS\Extbase\Utility\LocalizationUtility::translate('extensionList.downloadViewHelper.submit', 'extensionmanager') . '" type="submit" class="' . $iconClasses . '" value="' . \TYPO3\CMS\Extbase\Utility\LocalizationUtility::translate('extensionList.downloadViewHelper.submit', 'extensionmanager') . '">';

        $this->tag->setContent($label . $pathSelector);
        $this->tag->addAttribute('class', 'download');
        return '<div id="' . htmlspecialchars($extension->getExtensionKey()) . '-downloadFromTer" class="downloadFromTer">' . $this->tag->render() . '</div>';
    }

}