added new blocklist plugin

Author: Athlon1600

src/Plugin/BlockListPlugin.php

@@ -0,0 +1,57 @@
+<?php
+
+use Proxy\Plugin\AbstractPlugin;
+use Proxy\Event\ProxyEvent;
+use Proxy\Config;
+
+// https://proxylist.hidemyass.com/upload/
+// TODO: this file is not found to be existant in ./plugins/ when namespace is specified
+class BlockListPlugin extends AbstractPlugin {
+	
+	function onBeforeRequest(ProxyEvent $event){
+		
+		$user_ip = $_SERVER['REMOTE_ADDR'];
+		$user_ip_long = sprintf('%u', ip2long($user_ip));
+		
+		$url = $event['request']->getUrl();
+		$url_host = parse_url($url, PHP_URL_HOST);
+		
+		$fnc_custom = Config::get('blocklist.custom');
+		if(is_callable($fnc_custom)){
+			
+			$ret = call_user_func($fnc_custom, compact('user_ip', 'user_ip_long', 'url', 'url_host') );
+			if(!$ret){
+				throw new \Exception("Error: Access Denied!");
+			}
+			
+			return;
+		}
+		
+		/*
+		1. Wildcard format:     1.2.3.*
+		2. CIDR format:         1.2.3/24  OR  1.2.3.4/255.255.255.0
+		3. Start-End IP format: 1.2.3.0-1.2.3.255
+		*/
+		$ip_match = false;
+		$action_block = true;
+		
+		if(Config::has('blocklist.ip_allow')){
+			$ip_match = Config::get('blocklist.ip_allow');
+			$action_block = false;
+		} else if(Config::has('blocklist.ip_block')){
+			$ip_match = Config::get('blocklist.ip_block');
+		}
+		
+		if($ip_match){
+			$m = re_match($ip_match, $user_ip);
+			
+			// ip matched and we are in block_mode
+			// ip NOT matched and we are in allow mode
+			if( ($m && $action_block) || (!$m && !$action_block)){
+				throw new \Exception("Error: Access denied!");
+			}
+		}
+	}
+}
+
+?>

src/helpers.php

@@ -15,6 +15,17 @@ function in_arrayi($needle, $haystack){
 	return in_array(strtolower($needle), array_map('strtolower', $haystack));
 }
 
+function re_match($pattern, $string){
+	
+	$quoted = preg_quote($pattern, '#');
+	$translated = strtr($quoted, array(
+		'\*' => '.*',
+		'\?' => '.'
+	));
+	
+	return preg_match("#^".$translated."$#i", $string) === 1;
+}
+
 // regular array_merge does not work if arrays have numeric keys...
 function array_merge_custom(){