/administrator/components/com_admintools/liveupdate/classes/download.php
PHP | 333 lines | 211 code | 44 blank | 78 comment | 46 complexity | d17c3a74e8313e47a9619ed8f205054e MD5 | raw file
- <?php
- /**
- * @package LiveUpdate
- * @copyright Copyright ©2011 Nicholas K. Dionysopoulos / AkeebaBackup.com
- * @license GNU LGPLv3 or later <http://www.gnu.org/copyleft/lesser.html>
- */
- defined('_JEXEC') or die();
- /**
- * Allows downloading packages over the web to your server
- */
- class LiveUpdateDownloadHelper
- {
- /**
- * Downloads from a URL and saves the result as a local file
- * @param <type> $url
- * @param <type> $target
- * @return bool True on success
- */
- public static function download($url, $target)
- {
- // Import Joomla! libraries
- jimport('joomla.filesystem.file');
- /** @var bool Did we try to force permissions? */
- $hackPermissions = false;
- // Make sure the target does not exist
- if(JFile::exists($target)) {
- if(!@unlink($target)) {
- JFile::delete($target);
- }
- }
- // Try to open the output file for writing
- $fp = @fopen($target, 'wb');
- if($fp === false) {
- // The file can not be opened for writing. Let's try a hack.
- if( JFile::write($target, '') ) {
- if( self::chmod($target, 511) ) {
- $fp = @fopen($target, 'wb');
- $hackPermissions = true;
- }
- }
- }
-
- $result = false;
- if($fp !== false)
- {
- // First try to download directly to file if $fp !== false
- $adapters = self::getAdapters();
- $result = false;
- while(!empty($adapters) && ($result === false)) {
- // Run the current download method
- $method = 'get' . strtoupper( array_shift($adapters) );
- $result = self::$method($url, $fp);
-
- // Check if we have a download
- if($result === true) {
- // The download is complete, close the file pointer
- @fclose($fp);
- // If the filesize is not at least 1 byte, we consider it failed.
- clearstatcache();
- $filesize = @filesize($target);
- if($filesize <= 0) {
- $result = false;
- $fp = @fopen($target, 'wb');
- }
- }
- }
-
- // If we have no download, close the file pointer
- if($result === false) {
- @fclose($fp);
- }
- }
- if($result === false)
- {
- // Delete the target file if it exists
- if(file_exists($target)) {
- if( !@unlink($target) ) {
- JFile::delete($target);
- }
- }
- // Download and write using JFile::write();
- $result = JFile::write($target, self::downloadAndReturn($url) );
- }
-
- return $result;
- }
- /**
- * Downloads from a URL and returns the result as a string
- * @param <type> $url
- * @return mixed Result string on success, false on failure
- */
- public static function downloadAndReturn($url)
- {
- $adapters = self::getAdapters();
- $result = false;
-
- while(!empty($adapters) && ($result === false)) {
- // Run the current download method
- $method = 'get' . strtoupper( array_shift($adapters) );
- $result = self::$method($url, null);
- }
-
- return $result;
- }
- /**
- * Does the server support PHP's cURL extension?
- * @return bool True if it is supported
- */
- private static function hasCURL()
- {
- static $result = null;
- if(is_null($result))
- {
- $result = function_exists('curl_init');
- }
- return $result;
- }
-
- /**
- * Downloads the contents of a URL and writes them to disk (if $fp is not null)
- * or returns them as a string (if $fp is null)
- * @param string $url The URL to download from
- * @param resource $fp The file pointer to download to. Omit to return the contents.
- * @return bool|string False on failure, true on success ($fp not null) or the URL contents (if $fp is null)
- */
- private static function &getCURL($url, $fp = null)
- {
- $result = false;
-
- $ch = curl_init($url);
-
- if( !@curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 1) ) {
- // Safe Mode is enabled. We have to fetch the headers and
- // parse any redirections present in there.
- curl_setopt($ch, CURLOPT_AUTOREFERER, true);
- curl_setopt($ch, CURLOPT_FAILONERROR, true);
- curl_setopt($ch, CURLOPT_HEADER, true);
- curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
- curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
- curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 10);
- curl_setopt($ch, CURLOPT_TIMEOUT, 30);
- // Get the headers
- $data = curl_exec($ch);
- curl_close($ch);
-
- // Init
- $newURL = $url;
-
- // Parse the headers
- $lines = explode("\n", $data);
- foreach($lines as $line) {
- if(substr($line, 0, 9) == "Location:") {
- $newURL = trim(substr($line,9));
- }
- }
- // Download from the new URL
- return self::getCURL($newURL, $fp);
- } else {
- @curl_setopt($ch, CURLOPT_MAXREDIRS, 20);
- }
-
- curl_setopt($ch, CURLOPT_AUTOREFERER, true);
- curl_setopt($ch, CURLOPT_FAILONERROR, true);
- curl_setopt($ch, CURLOPT_HEADER, false);
- curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
- curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
- curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 10);
- curl_setopt($ch, CURLOPT_TIMEOUT, 30);
- // Pretend we are IE7, so that webservers play nice with us
- curl_setopt($ch, CURLOPT_USERAGENT, 'Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; .NET CLR 1.0.3705; .NET CLR 1.1.4322; Media Center PC 4.0)');
-
- if(is_resource($fp)) {
- curl_setopt($ch, CURLOPT_FILE, $fp);
- }
-
- $result = curl_exec($ch);
- curl_close($ch);
-
- return $result;
- }
- /**
- * Does the server support URL fopen() wrappers?
- * @return bool
- */
- private static function hasFOPEN()
- {
- static $result = null;
- if(is_null($result))
- {
- // If we are not allowed to use ini_get, we assume that URL fopen is
- // disabled.
- if(!function_exists('ini_get')) {
- $result = false;
- } else {
- $result = ini_get('allow_url_fopen');
- }
- }
- return $result;
- }
-
- private static function &getFOPEN($url, $fp = null)
- {
- $result = false;
-
- // Track errors
- if( function_exists('ini_set') ) {
- $track_errors = ini_set('track_errors',true);
- }
-
- // Open the URL for reading
- if(function_exists('stream_context_create')) {
- // PHP 5+ way (best)
- $httpopts = Array('user_agent'=>'Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; .NET CLR 1.0.3705; .NET CLR 1.1.4322; Media Center PC 4.0)');
- $context = stream_context_create( array( 'http' => $httpopts ) );
- $ih = @fopen($url, 'r', false, $context);
- } else {
- // PHP 4 way (actually, it's just a fallback as we can't run Admin Tools in PHP4)
- if( function_exists('ini_set') ) {
- ini_set('user_agent', 'Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; .NET CLR 1.0.3705; .NET CLR 1.1.4322; Media Center PC 4.0)');
- }
- $ih = @fopen($url, 'r');
- }
-
- // If fopen() fails, abort
- if( !is_resource($ih) ) {
- return $result;
- }
-
- // Try to download
- $bytes = 0;
- $result = true;
- $return = '';
- while (!feof($ih) && $result)
- {
- $contents = fread($ih, 4096);
- if ($contents === false) {
- @fclose($ih);
- $result = false;
- return $result;
- } else {
- $bytes += strlen($contents);
- if(is_resource($fp)) {
- $result = @fwrite($fp, $contents);
- } else {
- $return .= $contents;
- unset($contents);
- }
- }
- }
-
- @fclose($ih);
-
- if(is_resource($fp)) {
- return $result;
- } elseif( $result === true ) {
- return $return;
- } else {
- return $result;
- }
- }
- /**
- * Detect and return available download adapters
- * @return array
- */
- private static function getAdapters()
- {
- // Detect available adapters
- $adapters = array();
- if(self::hasCURL()) $adapters[] = 'curl';
- if(self::hasFOPEN()) $adapters[] = 'fopen';
- return $adapters;
- }
- /**
- * Change the permissions of a file, optionally using FTP
- * @param string $file Absolute path to file
- * @param int $mode Permissions, e.g. 0755
- */
- private static function chmod($path, $mode)
- {
- if(is_string($mode))
- {
- $mode = octdec($mode);
- if( ($mode < 0600) || ($mode > 0777) ) $mode = 0755;
- }
- // Initialize variables
- jimport('joomla.client.helper');
- $ftpOptions = JClientHelper::getCredentials('ftp');
- // Check to make sure the path valid and clean
- $path = JPath::clean($path);
- if ($ftpOptions['enabled'] == 1) {
- // Connect the FTP client
- jimport('joomla.client.ftp');
- $ftp = &JFTP::getInstance(
- $ftpOptions['host'], $ftpOptions['port'], null,
- $ftpOptions['user'], $ftpOptions['pass']
- );
- }
- if(@chmod($path, $mode))
- {
- $ret = true;
- } elseif ($ftpOptions['enabled'] == 1) {
- // Translate path and delete
- jimport('joomla.client.ftp');
- $path = JPath::clean(str_replace(JPATH_ROOT, $ftpOptions['root'], $path), '/');
- // FTP connector throws an error
- $ret = $ftp->chmod($path, $mode);
- } else {
- return false;
- }
- }
- }