TerUtility.php

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<?php
 
/*
 * This file is part of the TYPO3 CMS project.
 *
 * It is free software; you can redistribute it and/or modify it under
 * the terms of the GNU General Public License, either version 2
 * of the License, or any later version.
 *
 * For the full copyright and license information, please read the
 * LICENSE.txt file that was distributed with this source code.
 *
 * The TYPO3 project - inspiring people to share!
 */
 
namespace ‪TYPO3\CMS\Extensionmanager\Utility\Connection;
 
use ‪TYPO3\CMS\Core\Configuration\ExtensionConfiguration;
use ‪TYPO3\CMS\Core\Core\Environment;
use ‪TYPO3\CMS\Core\Utility\GeneralUtility;
use ‪TYPO3\CMS\Extensionmanager\Exception\ExtensionManagerException;
 
class ‪TerUtility
{
    public function ‪fetchExtension($extensionKey, $version, $expectedMd5, $mirrorUrl)
    {
        if (
            (bool)GeneralUtility::makeInstance(ExtensionConfiguration::class)->get('extensionmanager', 'offlineMode')
            || ‪Environment::isComposerMode()
        ) {
            throw new ‪ExtensionManagerException('Extension Manager is in offline mode. No TER connection available.', 1437078620);
        }
        $extensionPath = strtolower($extensionKey);
        $mirrorUrl .= $extensionPath[0] . '/' . $extensionPath[1] . '/' . $extensionPath . '_' . $version . '.t3x';
        $t3x = ‪GeneralUtility::getUrl($mirrorUrl);
        $md5 = md5($t3x);
        if ($t3x === false) {
            throw new ‪ExtensionManagerException(sprintf('The T3X file "%s" could not be fetched. Possible reasons: network problems, allow_url_fopen is off, cURL is not enabled in Install Tool.', $mirrorUrl), 1334426097);
        }
        if ($md5 === $expectedMd5) {
            // Fetch and return:
            $extensionData = $this->‪decodeExchangeData($t3x);
        } else {
            throw new ‪ExtensionManagerException('Error: MD5 hash of downloaded file not as expected: ' . $md5 . ' != ' . $expectedMd5, 1334426098);
        }
        return $extensionData;
    }
 
    public function ‪decodeExchangeData($stream)
    {
        $parts = explode(':', $stream, 3);
        if ($parts[1] === 'gzcompress') {
            if (function_exists('gzuncompress')) {
                $parts[2] = (string)gzuncompress($parts[2]);
            } else {
                throw new ‪ExtensionManagerException('Decoding Error: No decompressor available for compressed content. gzcompress()/gzuncompress() functions are not available!', 1344761814);
            }
        }
        if (hash_equals($parts[0], md5($parts[2]))) {
            ‪$output = unserialize($parts[2], ['allowed_classes' => false]);
            if (!is_array(‪$output)) {
                throw new ‪ExtensionManagerException('Error: Content could not be unserialized to an array. Strange (since MD5 hashes match!)', 1344761938);
            }
        } else {
            throw new ‪ExtensionManagerException('Error: MD5 mismatch. Maybe the extension file was downloaded and saved as a text file by the browser and thereby corrupted!? (Always select "All" filetype when saving extensions)', 1344761991);
        }
        return ‪$output;
    }
}