UpdateScriptViewHelper.php

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

class UpdateScriptViewHelper extends \TYPO3\CMS\Fluid\ViewHelpers\Link\ActionViewHelper {

    protected $objectManager;

    protected $tagName = 'a';

    public function render($extensionKey) {
        $tag = '';

        // If the "class.ext_update.php" file exists, build link to the update script screen
        $updateScriptUtility = $this->objectManager->get('TYPO3\\CMS\\Extensionmanager\\Utility\\UpdateScriptUtility');
        if ($updateScriptUtility->checkUpdateScriptExists($extensionKey)) {
            $uriBuilder = $this->controllerContext->getUriBuilder();
            $action = 'show';
            $uri = $uriBuilder->reset()->uriFor(
                $action,
                array('extensionKey' => $extensionKey),
                'UpdateScript'
            );
            $this->tag->addAttribute('href', $uri);
            $this->tag->addAttribute('title', \TYPO3\CMS\Extbase\Utility\LocalizationUtility::translate('extensionList.update.script', 'extensionmanager'));
            $this->tag->setContent(\TYPO3\CMS\Backend\Utility\IconUtility::getSpriteIcon('extensions-extensionmanager-update-script'));
            $tag = $this->tag->render();
        }
        return $tag;
    }

}