Taiwan Online Judge Alpha 1

1 files changed, 71 insertions, 0 deletions

diff --git a/toj/php/event.inc.php b/toj/php/event.inc.php
new file mode 100644
index 0000000..9d2a23c
--- /dev/null
+++ b/toj/php/event.inc.php
@@ -0,0 +1,71 @@
+<?php
+class event
+{
+    private static $white_list;
+
+    private static function init()
+    {
+	event::$white_list = array('10.8.0.2');
+    }
+
+    // execute function $name in file $fname
+    // if want to call a function of a class, have 2 choice:
+    // 1. pass an array as $name, put every level of class in it, like:
+    //   A::B::C() should be passed like array("A", "B", "C").
+    // 2. pass a string with :: directly, it will be automatically 
+    //   translated.
+    // return value will be FALSE on failure, return value of target
+    // function otherwise. NULL when no return value.
+    public static function exec_func($fname, $name, $arg)
+    {
+	if(!file_exists($fname))
+	{
+	    return false;
+	}
+	require_once($fname);
+	if(is_string($name) && strpos($name, ":") !== FALSE)
+	{
+	    $name = preg_split("/::/", $name);
+	}
+	if(is_string($name) && !is_callable($name))
+	{
+	    return false;
+	}
+	if(is_array($name) && !is_callable(join($name, "::")))
+	{
+	    return false;
+	}
+	if($arg == NULL)
+	{
+	    $res = call_user_func($name);
+	}
+	else
+	{
+	    $res = call_user_func_array($name, $arg);
+	}
+	if($res === false)
+	{
+	    return false;
+	}
+	return $res;
+    }
+
+    public static function validate_ip()
+    {
+	event::init();
+	if (!empty($_SERVER['HTTP_CLIENT_IP']))
+	{
+	    $ip=$_SERVER['HTTP_CLIENT_IP'];
+	}
+	else if (!empty($_SERVER['HTTP_X_FORWARDED_FOR']))
+	{
+	    $ip=$_SERVER['HTTP_X_FORWARDED_FOR'];
+	}
+	else
+	{
+	    $ip=$_SERVER['REMOTE_ADDR'];
+	}
+	return in_array($ip, event::$white_list);
+    }
+}
+?>