Module-Util/modules/util/steamid_converter.php

<?php
/*
 *
 * OGP - Open Game Panel
 * Copyright (C) 2008 - 2017 The OGP Development Team
 *
 * http://www.opengamepanel.org/
 *
 * 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
 * of the License, or 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.
 *
 */

	include 'util_config.php';
	
	session_name($sessionName);
	session_start();
	
	if(!empty($_SESSION['user_id']) && $_SERVER['REQUEST_METHOD'] === 'POST'){
		function toCommunityID($id){
			if(preg_match('/^STEAM_/', $id)){
				$parts = explode(':', $id);
				return bcadd(bcadd(bcmul($parts[2], '2'), '76561197960265728'), $parts[1]);
			}elseif(is_numeric($id) && strlen($id) < 16){
				return bcadd($id, '76561197960265728');
			}else{
				return $id;
			}
		}
		
		function toSteamID($id){
			if(is_numeric($id) && strlen($id) >= 16){
				$z = bcdiv(bcsub($id, '76561197960265728'), '2');
			}elseif(is_numeric($id)){
				$z = bcdiv($id, '2');
			}else{
				return $id;
			}
			
			$y = bcmod($id, '2');
			return 'STEAM_0:'.$y.':'.floor($z);
		}
		
		function toUserID($id){
			if(preg_match('/^STEAM_/', $id)){
				$split = explode(':', $id);
				return $split[2] * 2 + $split[1];
			}elseif(preg_match('/^765/', $id) && strlen($id) > 15){
				return bcsub($id, '76561197960265728');
			}else{
				return $id;
			}
		}
		
		function getSteamId($input){
			$xml = simplexml_load_file('http://steamcommunity.com/id/'.$input.'?xml=1');
			$steamId64 = $xml->steamID64;
			
			if(preg_match('/^765/', $steamId64) === 0){
				return false;
			}else{
				return (string)$steamId64;	// Cast it to a string, otherwise an SimpleXMLElement Object will be returned.
			}
		}
		
		function convert($id){
			if(preg_match('/^\[U:1:[0-9]+\]/', $id)){
				$id = substr($id, 5, -1);
			}
			
			// Check if the input is in legacyId, communityId, or SteamId3 format.
			// If it's not, assume it's a custom Id and attempt to get the communityId from what the user entered.
			if(preg_match('/^STEAM_[01]:[01]:\d+$/', $id) === 0 && preg_match('/^[0-9]/', $id) === 0 && preg_match('/^765/', $id) === 0){
				if(($steamId = getSteamId($id)) === false){
					return json_encode(array());
				}
				
				$id = $steamId;
			}
			
			return json_encode(array(
				'communityId'	=>	toCommunityID($id),
				'steamId'		=>	toSteamID($id),
				'steamId3'		=>	'[U:1:'.toUserID($id).']',
				'steamProfile'	=>	'<a href="http://steamcommunity.com/profiles/'.toCommunityID($id).'">Steam Profile</a>',
			));
		}
		
		echo convert($_POST['steam_input']);
	}else{//_SESSION check.
		header('HTTP/1.0 403 Forbidden');
		exit;
	}
?>