<?php if (!defined('VB_ENTRY')) die('Access denied.');
/*========================================================================*\
|| ###################################################################### ||
|| # vBulletin 5.4.1
|| # ------------------------------------------------------------------ # ||
|| # Copyright 2000-2018 vBulletin Solutions Inc. All Rights Reserved.  # ||
|| # This file may not be redistributed in whole or significant part.   # ||
|| # ----------------- VBULLETIN IS NOT FREE SOFTWARE ----------------- # ||
|| # http://www.vbulletin.com | http://www.vbulletin.com/license.html   # ||
|| ###################################################################### ||
\*========================================================================*/

if ((($current_memory_limit =  vB_Utilities::ini_size_to_bytes(@ini_get('memory_limit'))) < 256 * 1024 * 1024) AND ($current_memory_limit > 0))
{
	@ini_set('memory_limit', 256 * 1024 * 1024);
}

class vB_XML_Builder
{
	use vB_Trait_NoSerialize;

	var $charset = 'windows-1252';
	var $content_type = 'text/xml';
	var $open_tags = array();
	var $tabs = "";
	public $doc = "";

	/**
	 * vB_XML_Builder constructor.
	 *
	 * @param $content_type
	 * @param $charset
	 */
	function __construct($content_type = null, $charset = null)
	{
		if ($content_type)
		{
			$this->content_type = $content_type;
		}

		if ($charset == null)
		{
			$userinfo = vB_User::fetchUserinfo();
			$charset = !empty($userinfo['lang_charset']) ? $userinfo['lang_charset'] : vB_Template_Runtime::fetchStyleVar('charset');
			if (empty($charset))
			{
				$charset = 'utf-8';
			}
		}

		$this->charset = (strtolower($charset) == 'iso-8859-1') ? 'windows-1252' : $charset;
	}

	/**
	* Fetches the content type header with $this->content_type
	*/
	function fetch_content_type_header()
	{
		return 'Content-Type: ' . $this->content_type . ($this->charset == '' ? '' : '; charset=' . $this->charset);
	}

	/**
	* Fetches the content length header
	*/
	function fetch_content_length_header()
	{
		return 'Content-Length: ' . $this->fetch_xml_content_length();
	}

	/**
	* Sends the content type header with $this->content_type
	*/
	function send_content_type_header()
	{
		@header('Content-Type: ' . $this->content_type . ($this->charset == '' ? '' : '; charset=' . $this->charset));
	}

	/**
	* Sends the content length header
	*/
	function send_content_length_header()
	{
		@header('Content-Length: ' . $this->fetch_xml_content_length());
	}

	/**
	* Returns the <?xml tag complete with $this->charset character set defined
	*
	* @return	string	<?xml tag
	*/
	function fetch_xml_tag()
	{
		return '<?xml version="1.0" encoding="' . $this->charset . '"?>' . "\n";
	}

	/**
	*
	* @return	integer	Length of document
	*/
	function fetch_xml_content_length()
	{
		return strlen($this->doc) + strlen($this->fetch_xml_tag());
	}

	function add_group($tag, $attr = array())
	{
		$this->open_tags[] = $tag;
		$this->doc .= $this->tabs . $this->build_tag($tag, $attr) . "\n";
		$this->tabs .= "\t";
	}

	function close_group()
	{
		$tag = array_pop($this->open_tags);
		$this->tabs = substr($this->tabs, 0, -1);
		$this->doc .= $this->tabs . "</$tag>\n";
	}

	function add_tag($tag, $content = '', $attr = array(), $cdata = false, $htmlspecialchars = false)
	{
		$this->data[$tag] = $content;
		$this->doc .= $this->tabs . $this->build_tag($tag, $attr, ($content === ''));
		if ($content !== '')
		{
			if ($htmlspecialchars)
			{
				$this->doc .= htmlspecialchars_uni($content);
			}
			else if ($cdata OR preg_match('/[\<\>\&\'\"\[\]]/', $content))
			{
				$this->doc .= '<![CDATA[' . $this->escape_cdata($content) . ']]>';
			}
			else
			{
				$this->doc .= $content;
			}
			$this->doc .= "</$tag>\n";
		}
	}

	function build_tag($tag, $attr, $closing = false)
	{
		$tmp = "<$tag";
		if (!empty($attr))
		{
			foreach ($attr AS $attr_name => $attr_key)
			{
				if (strpos($attr_key, '"') !== false)
				{
					$attr_key = htmlspecialchars_uni($attr_key);
				}
				$tmp .= " $attr_name=\"$attr_key\"";
			}
		}
		$tmp .= ($closing ? " />\n" : '>');
		return $tmp;
	}

	function escape_cdata($xml)
	{
		// strip invalid characters in XML 1.0:  00-08, 11-12 and 14-31
		// I did not find any character sets which use these characters.
		$xml = preg_replace('#[\\x00-\\x08\\x0B\\x0C\\x0E-\\x1F]#', '', $xml);

		return str_replace(array('<![CDATA[', ']]>'), array('«![CDATA[', ']]»'), $xml);
	}

	function output()
	{
		if (!empty($this->open_tags))
		{
			trigger_error("There are still open tags within the document", E_USER_ERROR);
			return false;
		}

		return $this->doc;
	}

	/**
	* Prints out the queued XML and then exits.
	*
	* @param	boolean	If not using shut down functions, whether to do a full shutdown (session updates, etc) or to just close the DB
	*/
	function print_xml($full_shutdown = false)
	{
		if (defined('VB_API') AND VB_API === true)
		{
			print_output($this->data);
		}

		//run any registered shutdown functions
		/** @todo remove this line when vbulletin is removed from the global space */
		$GLOBALS['vbulletin']->shutdown->shutdown();
		if (defined('NOSHUTDOWNFUNC'))
		{
			if ($full_shutdown)
			{
				exec_shut_down();
			}
			else
			{
//				$this->registry->db->close();
			}
		}

		$this->send_content_type_header();

		if ($this->fetch_send_content_length_header())
		{
			// this line is causing problems with mod_gzip/deflate, but is needed for some IIS setups
			$this->send_content_length_header();
		}

		echo $this->fetch_xml();
		exit;
	}

	/**
	* Prints XML header, use this if you need to output data that can't be easily queued. It won't work properly if content-length is required
	*
	* @param	boolean	If not using shut down functions, whether to do a full shutdown (session updates, etc) or to just close the DB
	*/
	function print_xml_header()
	{
		// Can't use this is we need to send a content length header as we don't know how much bogus data is going to be sent
		if ($this->fetch_send_content_length_header())
		{
			if (!defined('SUPPRESS_KEEPALIVE_ECHO'))
			{
				define('SUPPRESS_KEEPALIVE_ECHO', true);
			}
			return false;
		}

		$this->send_content_type_header();
		echo $this->fetch_xml_tag();
	}

	/**
	* Prints out the queued XML and then exits. Use in combination with print_xml_header();
	*
	* @param	boolean	If not using shut down functions, whether to do a full shutdown (session updates, etc) or to just close the DB
	*/
	function print_xml_end($full_shutdown = false)
	{
		// Can't use this is we need to send a content length header as we don't know how much bogus data is going to be sent
		if ($this->fetch_send_content_length_header())
		{
			return $this->print_xml();
		}

		//run any registered shutdown functions
		$GLOBALS['vbulletin']->shutdown->shutdown();
		if (defined('NOSHUTDOWNFUNC'))
		{
			if ($full_shutdown)
			{
				exec_shut_down();
			}
			else
			{
//				$this->registry->db->close();
			}
		}

		echo $this->output();
	}

	/**
	 * Determine if we send the content length header
	 *
	 * @return boolean
	 */
	function fetch_send_content_length_header()
	{
		if (VB_AREA == 'Install' OR VB_AREA == 'Upgrade')
		{
			return (strpos($_SERVER['SERVER_SOFTWARE'], 'Microsoft-IIS') !== false);
		}
		else
		{
			$vboptions = vB::get_datastore()->get_value('options');

			switch($vboptions['ajaxheader'])
			{
				case 0 :
					return true;

				case 1 :
					return false;

				case 2 :
				default:
					return (strpos($_SERVER['SERVER_SOFTWARE'], 'Microsoft-IIS') !== false);
			}
		}
	}

	/**
	 * Fetches the queued XML
	 *
	 * @return string
	 */
	function fetch_xml()
	{
		return $this->fetch_xml_tag() . $this->output();
	}
}

/*=========================================================================*\
|| #######################################################################
|| # NulleD By - vBSupport.org
|| # CVS: $RCSfile$ - $Revision: 96581 $
|| #######################################################################
\*=========================================================================*/
