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<?php
/**
* @package Joomla.Administrator
* @subpackage com_joomlaupdate
*
* @copyright Copyright (C) 2005 - 2015 Open Source Matters, Inc. All rights reserved.
* @license GNU General Public License version 2 or later; see LICENSE.txt
*/
defined('_JEXEC') or die;
/**
* Smart download helper. Automatically uses cURL or URL fopen() wrappers to
* fetch the package.
*
* @since 2.5.4
*/
class AdmintoolsHelperDownload
{
/**
* Downloads from a URL and saves the result as a local file.
*
* @param string $url The URL to download from.
* @param string $target The file path to download to.
*
* @return bool True on success
*
* @since 2.5.4
*/
public static function download($url, $target)
{
jimport('joomla.filesystem.file');
// Make sure the target does not exist.
if (JFile::exists($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.
$empty = '';
if ( JFile::write($target, $empty) )
{
if ( self::chmod($target, 511) )
{
$fp = @fopen($target, 'wb');
}
}
}
$result = false;
if ($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 string $url The URL to download from.
*
* @return mixed Result string on success, false on failure.
*
* @since 2.5.4
*/
public static function downloadAndReturn($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
*
* @since 2.5.4
*/
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.
* @param boolean $nofollow Should we follow 301/302/307 redirection HTTP headers?
*
* @return bool|string False on failure, true on success ($fp not null) or the URL contents (if $fp is null).
*
* @since 2.5.4
*/
private static function &getCURL($url, $fp = null, $nofollow = false)
{
$ch = curl_init($url);
if ( !@curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 1) && !$nofollow )
{
// 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));
}
}
if ($url != $newURL)
{
return self::getCURL($newURL, $fp);
}
else
{
return self::getCURL($newURL, $fp, true);
}
}
else
{
@curl_setopt($ch, CURLOPT_MAXREDIRS, 20);
if (function_exists('set_time_limit'))
{
set_time_limit(0);
}
}
curl_setopt($ch, CURLOPT_HEADER, 0);
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, 0);
curl_setopt($ch, CURLOPT_USERAGENT, 'Joomla/' . JVERSION);
if (is_resource($fp))
{
curl_setopt($ch, CURLOPT_FILE, $fp);
}
else
{
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
}
$result = curl_exec($ch);
curl_close($ch);
return $result;
}
/**
* Does the server support URL fopen() wrappers?
*
* @return bool
*
* @since 2.5.4
*/
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;
}
/**
* Download from a URL using URL fopen() wrappers.
*
* @param string $url The URL to download from.
* @param resource $fp The file pointer to download to; leave null to return the d/l file as a string.
*
* @return bool|string False on failure, true on success ($fp not null) or the URL contents (if $fp is null).
*
* @since 2.5.4
*/
private static function &getFOPEN($url, $fp = null)
{
$result = false;
// Open the URL for reading
if (function_exists('stream_context_create'))
{
$opts = stream_context_get_options(stream_context_get_default());
$opts['http']['user_agent'] = 'Joomla/' . JVERSION;
$context = stream_context_create($opts);
$ih = @fopen($url, 'r', false, $context);
}
else
{
// PHP 4 way (actually, it's just a fallback)
if ( function_exists('ini_set') )
{
ini_set('user_agent', 'Joomla/' . JVERSION);
}
$ih = @fopen($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" (not really adapters, as
* we don't follow the Adapter pattern, yet)..
*
* @return array
*
* @since 2.5.4
*/
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 $path Absolute path to file.
* @param int $mode Permissions, e.g. 0755.
*
* @return boolean True on success.
*
* @since 2.5.4
*/
private static function chmod($path, $mode)
{
if (is_string($mode))
{
$mode = octdec($mode);
if ( ($mode < 0600) || ($mode > 0777) )
{
$mode = 0755;
}
}
$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
$ftp = JClientFtp::getInstance(
$ftpOptions['host'], $ftpOptions['port'], array(),
$ftpOptions['user'], $ftpOptions['pass']
);
}
if (@chmod($path, $mode))
{
$ret = true;
}
elseif ($ftpOptions['enabled'] == 1)
{
// Translate path and delete
$path = JPath::clean(str_replace(JPATH_ROOT, $ftpOptions['root'], $path), '/');
// FTP connector throws an error
$ret = $ftp->chmod($path, $mode);
}
else
{
return false;
}
return $ret;
}
}
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