TerUtility.php

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

use TYPO3\CMS\Extensionmanager\Exception\ExtensionManagerException;

class TerUtility {

    public $wsdlUrl;

    public function fetchExtension($extensionKey, $version, $expectedMd5, $mirrorUrl) {
        $extensionPath = \TYPO3\CMS\Core\Utility\GeneralUtility::strtolower($extensionKey);
        $mirrorUrl .= $extensionPath[0] . '/' . $extensionPath[1] . '/' . $extensionPath . '_' . $version . '.t3x';
        $t3x = \TYPO3\CMS\Core\Utility\GeneralUtility::getUrl($mirrorUrl, 0, array(TYPO3_user_agent));
        $md5 = md5($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:<br />' . $md5 . ' != ' . $expectedMd5, 1334426098);
        }
        return $extensionData;
    }

    public function decodeServerData($externalData) {
        $parts = explode(':', $externalData, 4);
        $dat = base64_decode($parts[2]);
        gzuncompress($dat);
        // compare hashes ignoring any leading whitespace. See bug #0000365.
        if (ltrim($parts[0]) == md5($dat)) {
            if ($parts[1] == 'gzcompress') {
                if (function_exists('gzuncompress')) {
                    $dat = gzuncompress($dat);
                } else {
                    throw new ExtensionManagerException('Decoding Error: No decompressor available for compressed content. gzuncompress() function is not available!', 1342859463);
                }
            }
            $listArr = unserialize($dat);
            if (!is_array($listArr)) {
                throw new ExtensionManagerException('Error: Unserialized information was not an array - strange!', 1342859489);
            }
        } else {
            throw new ExtensionManagerException('Error: MD5 hashes in T3X data did not match!', 1342859505);
        }
        return $listArr;
    }

    public function decodeExchangeData($stream) {
        $parts = explode(':', $stream, 3);
        if ($parts[1] == 'gzcompress') {
            if (function_exists('gzuncompress')) {
                $parts[2] = gzuncompress($parts[2]);
            } else {
                throw new ExtensionManagerException('Decoding Error: No decompressor available for compressed content. gzcompress()/gzuncompress() ' . 'functions are not available!', 1344761814);
            }
        }
        if (md5($parts[2]) === $parts[0]) {
            $output = unserialize($parts[2]);
            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;
    }

}