DownloadUtility.php

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

class DownloadUtility implements \TYPO3\CMS\Core\SingletonInterface {

    protected $terUtility;

    protected $repositoryHelper;

    protected $downloadPath = 'Local';

    protected $fileHandlingUtility;

    public function download(\TYPO3\CMS\Extensionmanager\Domain\Model\Extension $extension) {
        $mirrorUrl = $this->repositoryHelper->getMirrors()->getMirrorUrl();
        $fetchedExtension = $this->terUtility->fetchExtension($extension->getExtensionKey(), $extension->getVersion(), $extension->getMd5hash(), $mirrorUrl);
        if (isset($fetchedExtension['extKey']) && !empty($fetchedExtension['extKey']) && is_string($fetchedExtension['extKey'])) {
            $this->fileHandlingUtility->unpackExtensionFromExtensionDataArray($fetchedExtension, $extension, $this->getDownloadPath());
        }
    }

    public function setDownloadPath($downloadPath) {
        if (!in_array($downloadPath, \TYPO3\CMS\Extensionmanager\Domain\Model\Extension::returnAllowedInstallTypes())) {
            throw new \TYPO3\CMS\Extensionmanager\Exception\ExtensionManagerException(htmlspecialchars($downloadPath) . ' not in allowed download paths', 1344766387);
        }
        $this->downloadPath = $downloadPath;
    }

    public function getDownloadPath() {
        return $this->downloadPath;
    }

}