<?php
/** \file html\index.php
 *  \brief ZKL webinterface main parser file
 *  \author Rob Schalken, Core|Vision
 *  \version 1.0
 *  \date 17-10-2008
 *
 * This file checks whether a background process must be started or a "normal" webpage must be displayed
 */

/*
 * Required page(s) 
 */
require_once("include/definitions.php");
require_once("include/utilities.php");
require_once("include/db.php");


/*
 * Check if background is needed and allowed
 */ 
if ((isset($_POST['background_id'])) && (stristr($_POST['background_id'], $_GET['id']) !== FALSE)) {    
  // Check if valid id
  // Session_id _ unique number
  $id_check = explode('_', $_POST['background_id']);
  if ((is_array($id_check)) && (sizeof($id_check) == 2) && 
      ($id_check[0] == $_GET['id']) && 
      (is_numeric($id_check[1])) && (abs(($id_check[1]/1000) - (microtime(TRUE))) < (15 * 60))) {    
    // Check if process already exist?    
    $background_process = db_fetch_data("SELECT * FROM session where id='" . $_POST['background_id'] . "'");
    if (empty($background_process)) {       
      // Create process entry (empty data to indicate the starting point)
      db_store_data("INSERT INTO session (id, data, expiration) values('" . $_POST['background_id'] . "','', unix_timestamp(date_add(now(), interval 1 hour)))");           
     
      // Create process in the background
      exec("nohup " . $_PHP_CLI . " index_st.php '" . urlencode(serialize($_GET)) . "' '"  . urlencode(serialize($_POST)) . "' '" . $_COOKIE['PHPSESSID'] . "' > /dev/null &");
    }
    // Process ready (lenght data > 0)? 
    else if (strlen($background_process[0]['data'])) {       
      // Remove process entry from database
      db_store_data("DELETE FROM session WHERE id='" . $_POST['background_id'] . "'");
  
      // Echo result
      echo $background_process[0]['data'];      
    }
  }
  else {    
    // Log abuse!!!
    DBG("MTinfo abuse, Someone is trying to abuse MTinfo!!" . $_POST['background_id']);    
    
    // Display error page   
    echo _("An error occured, please contact") . " " . "Dual Inventive!";    
    
    exit;
  } 
}
// Handle "normal" pages and call second stage
else {
  require_once("index_st.php");
}
?>