<?php
# $Id$
# http://www.mapbender.org/index.php/class_administration
# Copyright (C) 2002 CCGIS
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2, or (at your option)
# any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.

/**
 * class to handle the querystring and the params
 */
 
class QueryHandler{
	
	private $reqParams = array();
	private $reqParamsToLower = array();
	private $owsproxyServiceKey = 'wms';
	private $owsproxyServiceId;
	private $onlineResource;
	/**
	 * Constructor of the QueryHandler
	 * 
	 */
	function __construct(){
		$this->setRequestParams(array_keys($_REQUEST));
		$notice = new mb_notice("const: querystring: ".$this->getQueryString());
	}
	
	/**
	 * set all query parameter-keys and -values to lowerCase
	 * so that they could be handled caseinsensitive
	 * 
	 * set another array with original keys and values
	 *
	 * @param string[] the keys of all query parameters
	 * @return string[] an associative array with request parameters keys (tolowercase) and values (tolower)
	 */
	function setRequestParams($keys){
       for($i=0; $i<count($keys); $i++){
           //SZ, 30.11.2007, writing REQUEST parameter values into local variable
           //as key will be modified
           $reqValue = $_REQUEST[$keys[$i]];
           if(strpos($keys[$i], "?") === 0){
                           $keys[$i] = substr($keys[$i],1);
           }
           $this->reqParams[strtolower($keys[$i])] = $reqValue;
           $this->reqParamsToLower[strtolower($keys[$i])] = $reqValue;
           if($keys[$i] == $this->owsproxyServiceKey){
               $this->owsproxyServiceId = $_REQUEST[$keys[$i]];
               $notice = new mb_notice("owsId: ".$this->owsproxyServiceId);
           }
       }
   }
	
	
	/**
	 * checks is a request param is part of the original request
	 * 
	 * @param string request key
	 * @return boolean true if it is part of original request
	 */
	function isValidParam($key){
		if($key == 'sid'){
			return false;
		}
		else if($key == $this->owsproxyServiceKey){
			return false;
		}
		else if($key == ini_get("session.name")){
			return false;
		}
		else if($key == 'request' && $this->reqParams[$key] == 'external'){
			return false;
		}
		else{
			return true;
		}
	}
	/** 
	 * gets the request params
	 * 
	 * @return request params
	 */
	function getRequestParams(){
		return $this->reqParamsToLower;
	}
	/**
	 * modifies the layers
	 */
	 function setParam($param,$value){
		$mykeys = array_keys($this->reqParams);
		for($i=0; $i<count($mykeys);$i++){
			if(strtolower($mykeys[$i]) == strtolower($param)){
				$this->reqParams[$mykeys[$i]] = $value;
				$n = new mb_notice("QueryHandler: setParam: ".serialize($this->reqParams));
			}
		}
	 }
	 /**
	  * gets the original query string
	  * 
	  * @return string original query string
	  */
	  function getQueryString(){
		$mykeys = array_keys($this->reqParams);
		$cnt = 0;
		for($i=0; $i<count($mykeys);$i++){
			if($this->isValidParam($mykeys[$i])){	
				if($cnt > 0){ 
					$qstring .= "&"; 
				}
				$qstring .= $mykeys[$i]."=".rawurlencode(stripslashes($this->reqParams[$mykeys[$i]]));
				$cnt++;
			}
		}
		$notice = new mb_notice("getQueryString() : " . $qstring);
		return $qstring;
	  }
	  /**
	   * gets the original request with url and query string
	   * 
	   * @return string request
	   */
	   function getRequest(){
	   		$req = $this->onlineResource.$this->getConjunctionCharacter($this->onlineResource).$this->getQueryString();
	   		$notice = new mb_notice("onlineResource:". $req);
	   		return $req;	
	   }
	   /**
	    * gets the conjunction character between url and query string
	    */
	    function getConjunctionCharacter($url){
			if(strpos($url,"?")){ 
				if(strpos($url,"?") == strlen($url)){ 
				$cchar = "";
				}else if(strpos($url,"&") == strlen($url)){
					$cchar = "";
				}else{
					$cchar = "&";
				}
			}
			if(strpos($url,"?") === false){
				$cchar = "?";
			} 
			return $cchar;  
		}
		function getOwsproxyServiceId(){
			return $this->owsproxyServiceId;
		}
		function setOnlineResource($url){
			$this->onlineResource = $url;
		}
}

?>