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2023-04-08 12:19:53 -04:00
commit 7c8c8b1c76
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+<?php
+
+/*
+Copyright 2013-2019 Yellow Tree, Siegen, Germany
+Author: Benjamin Pick (wp-geoip-detect| |posteo.de)
+
+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 3 of the License, 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., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+*/
+
+namespace YellowTree\GeoipDetect\Lib;
+
+class GetClientIp {
+	protected $proxyWhitelist = [];
+	protected $useProxyWhitelist = false;
+	
+	public function __construct() {
+		$this->proxyWhitelist[] = '::1';
+		$this->proxyWhitelist[] = '127.0.0.1';
+	}
+	
+	public function addProxiesToWhitelist($trusted_proxies) {
+		foreach ($trusted_proxies as $proxy) {
+			$proxy = geoip_detect_normalize_ip($proxy);
+			if ($proxy) {
+				$this->proxyWhitelist[] = $proxy;
+				$this->useProxyWhitelist = true;
+			}
+		}
+	}
+	
+	protected function getIpsFromRemoteAddr() {
+		if (!isset($_SERVER['REMOTE_ADDR']))
+			return ['::1'];
+
+		// REMOTE_ADDR may contain multiple adresses
+		$ip_list = explode(',', $_SERVER['REMOTE_ADDR']);
+		
+		return $ip_list;
+	}
+	
+	protected function getIpsFromForwardedFor($currentIpList) {
+		$ip_list_reverse = explode(',', isset($_SERVER["HTTP_X_FORWARDED_FOR"]) ? $_SERVER["HTTP_X_FORWARDED_FOR"] : '');
+
+		if ($this->useProxyWhitelist) {
+			// Add the REMOTE_ADDR to the available IP pool
+			$ip_list_reverse = array_merge($ip_list_reverse, $currentIpList);
+
+			$ip_list_reverse = array_filter($ip_list_reverse, function($value) {
+				$value = trim($value);
+				if (!$value) return false;
+				return false === geoip_detect_is_ip_equal($value, $this->proxyWhitelist);
+			});
+		}
+		
+		return $ip_list_reverse;
+	}
+	
+	public function getIp($useReverseProxy = false) {
+		$ip_list = $this->getIpsFromRemoteAddr();
+
+		if ($useReverseProxy)
+		{
+			$ip_list = $this->getIpsFromForwardedFor($ip_list);
+		}	
+		
+		// Each Proxy server append their information at the end, so the last IP is most trustworthy.
+		$ip = end($ip_list);
+		$ip = geoip_detect_normalize_ip($ip);
+
+		if (!geoip_detect_is_ip($ip))
+			$ip = '::1'; // By default, use localhost
+
+		// this is the correct one!
+		$ip = apply_filters('geoip_detect2_client_ip', $ip, $ip_list);
+
+		return $ip;
+	}
+}