<?php
  // Groupware class
  define('SHAREDLIB_PATH', get_cfg_var('icewarp_sharedlib_path'));
  include(SHAREDLIB_PATH . 'api/gw.php');
  include(SHAREDLIB_PATH . 'api/api.php');

  include('auth.php');

  // Create instance
  $gw = new IceWarpGWAPI();

  // From and to
  $from = $gw->unix2calendarDate(mktime());
  $to = $from + 30;

  // Email
  $email = urldecode($_SERVER['QUERY_STRING']);
  $urlemail=$email;

  // Public access
  if ($email && !isset($_SERVER['HTTP_AUTHORIZATION'])) {

    // Get interval calendars
    $ical = $gw->FunctionCall("getpublicvcalendar", $email, '', '', ';ITEMLIST');

  // Private access
  } else {

    // Check auth
    http_authenticate($gw);

    // Email
    $email = $gw->user;

    // Open group
    if ($urlemail)
    {
    	$gw->groupsessid = $gw->OpenGroup('~'.$urlemail);
   	}
   	else
   	{
   		$gw->groupsessid = $gw->OpenGroup();
   	}
    //echo $email;

    // Open default event folder
    $fsessid = $gw->FunctionCall("OpenFolder", $gw->groupsessid,'@@DEFAULT@@#E');
    // Get interval calendars
    $ical = $gw->FunctionCall("getvcalendars", $fsessid, '', '', ';ITEMLIST');

    // Logout
    $gw->Logout();
  }

  // Email set
  if ($email) {

    $filename = $email.".ics";

    if ($ical) {

      // Headers
      header("Content-Type: application/octet-stream");
      header("Content-Disposition: attachment; filename=\"$filename\"");

      // Print free busy
      print($ical);

    } elseif(!isset($_SERVER['HTTP_AUTHORIZATION'])) {
    	// pop http autentificate
		http_authenticate($gw);
    }
    else
    {
    	// Not found
      	header("HTTP/1.0 404 Not Found");
      	echo "Not Found";
    }
  }
?>