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<?php
/**
* @package Joomla.Platform
* @subpackage Environment
*
* @copyright Copyright (C) 2005 - 2013 Open Source Matters, Inc. All rights reserved.
* @license GNU General Public License version 2 or later; see LICENSE
*/
defined('JPATH_PLATFORM') or die;
/**
* JResponse Class.
*
* This class serves to provide the Joomla Platform with a common interface to access
* response variables. This includes header and body.
*
* @package Joomla.Platform
* @subpackage Environment
* @since 11.1
*/
class JResponse
{
/**
* @var array Body
* @since 11.1
*/
protected static $body = array();
/**
* @var boolean Cachable
* @since 11.1
*/
protected static $cachable = false;
/**
* @var array Headers
* @since 11.1
*/
protected static $headers = array();
/**
* Set/get cachable state for the response.
*
* If $allow is set, sets the cachable state of the response. Always returns current state.
*
* @param boolean $allow True to allow browser caching.
*
* @return boolean True if browser caching should be allowed
*
* @since 11.1
*/
public static function allowCache($allow = null)
{
if (!is_null($allow))
{
self::$cachable = (bool) $allow;
}
return self::$cachable;
}
/**
* Set a header.
*
* If $replace is true, replaces any headers already defined with that $name.
*
* @param string $name The name of the header to set.
* @param string $value The value of the header to set.
* @param boolean $replace True to replace any existing headers by name.
*
* @return void
*
* @since 11.1
*/
public static function setHeader($name, $value, $replace = false)
{
$name = (string) $name;
$value = (string) $value;
if ($replace)
{
foreach (self::$headers as $key => $header)
{
if ($name == $header['name'])
{
unset(self::$headers[$key]);
}
}
}
self::$headers[] = array('name' => $name, 'value' => $value);
}
/**
* Return array of headers.
*
* @return array
*
* @since 11.1
*/
public static function getHeaders()
{
return self::$headers;
}
/**
* Clear headers.
*
* @return void
*
* @since 11.1
*/
public static function clearHeaders()
{
self::$headers = array();
}
/**
* Send all headers.
*
* @return void
*
* @since 11.1
*/
public static function sendHeaders()
{
if (!headers_sent())
{
foreach (self::$headers as $header)
{
if ('status' == strtolower($header['name']))
{
// 'status' headers indicate an HTTP status, and need to be handled slightly differently
header(ucfirst(strtolower($header['name'])) . ': ' . $header['value'], null, (int) $header['value']);
}
else
{
header($header['name'] . ': ' . $header['value'], false);
}
}
}
}
/**
* Set body content.
*
* If body content already defined, this will replace it.
*
* @param string $content The content to set to the response body.
*
* @return void
*
* @since 11.1
*/
public static function setBody($content)
{
self::$body = array((string) $content);
}
/**
* Prepend content to the body content
*
* @param string $content The content to prepend to the response body.
*
* @return void
*
* @since 11.1
*/
public static function prependBody($content)
{
array_unshift(self::$body, (string) $content);
}
/**
* Append content to the body content
*
* @param string $content The content to append to the response body.
*
* @return void
*
* @since 11.1
*/
public static function appendBody($content)
{
array_push(self::$body, (string) $content);
}
/**
* Return the body content
*
* @param boolean $toArray Whether or not to return the body content as an array of strings or as a single string; defaults to false.
*
* @return string array
*
* @since 11.1
*/
public static function getBody($toArray = false)
{
if ($toArray)
{
return self::$body;
}
ob_start();
foreach (self::$body as $content)
{
echo $content;
}
return ob_get_clean();
}
/**
* Sends all headers prior to returning the string
*
* @param boolean $compress If true, compress the data
*
* @return string
*
* @since 11.1
*/
public static function toString($compress = false)
{
$data = self::getBody();
// Don't compress something if the server is going to do it anyway. Waste of time.
if ($compress && !ini_get('zlib.output_compression') && ini_get('output_handler') != 'ob_gzhandler')
{
$data = self::compress($data);
}
if (self::allowCache() === false)
{
self::setHeader('Cache-Control', 'no-cache', false);
// HTTP 1.0
self::setHeader('Pragma', 'no-cache');
}
self::sendHeaders();
return $data;
}
/**
* Compress the data
*
* Checks the accept encoding of the browser and compresses the data before
* sending it to the client.
*
* @param string $data Content to compress for output.
*
* @return string compressed data
*
* @note Replaces _compress method in 11.1
* @since 11.1
*/
protected static function compress($data)
{
$encoding = self::clientEncoding();
if (!$encoding)
{
return $data;
}
if (!extension_loaded('zlib') || ini_get('zlib.output_compression'))
{
return $data;
}
if (headers_sent())
{
return $data;
}
if (connection_status() !== 0)
{
return $data;
}
// Ideal level
$level = 4;
/*
$size = strlen($data);
$crc = crc32($data);
$gzdata = "\x1f\x8b\x08\x00\x00\x00\x00\x00";
$gzdata .= gzcompress($data, $level);
$gzdata = substr($gzdata, 0, strlen($gzdata) - 4);
$gzdata .= pack("V",$crc) . pack("V", $size);
*/
$gzdata = gzencode($data, $level);
self::setHeader('Content-Encoding', $encoding);
self::setHeader('X-Content-Encoded-By', 'Joomla! 2.5');
return $gzdata;
}
/**
* Check, whether client supports compressed data
*
* @return boolean
*
* @since 11.1
* @note Replaces _clientEncoding method from 11.1
*/
protected static function clientEncoding()
{
if (!isset($_SERVER['HTTP_ACCEPT_ENCODING']))
{
return false;
}
$encoding = false;
if (false !== strpos($_SERVER['HTTP_ACCEPT_ENCODING'], 'gzip'))
{
$encoding = 'gzip';
}
if (false !== strpos($_SERVER['HTTP_ACCEPT_ENCODING'], 'x-gzip'))
{
$encoding = 'x-gzip';
}
return $encoding;
}
}