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auth.php
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auth.php
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<?
class auth
{
private static $groups = array();
private static $user_groups = array();
private static $cookie_name = 'crossbar';
private static $errors = array();
private static $enabled = FALSE;
public static function load_user_groups()
{
if(count(self::$user_groups) == 0)
{
// Everyone gets access to the * group
self::$user_groups = array('*');
// Grab the logged in user, and add their groups
// to the groups we need to check
$groups = self::groups();
if($groups !== FALSE)
{
self::$user_groups = array_merge($groups, self::$user_groups);
}
}
}
public static function access($controller, $action)
{
if(!self::$enabled)
{
return TRUE;
}
// Load the user groups
self::load_user_groups();
// Loop through each of our groups and
// look for that controller/action in the list
foreach(self::$user_groups as $group)
{
if(isset(self::$groups[$group][$controller]))
{
if(in_array($action, self::$groups[$group][$controller]) || in_array('*', self::$groups[$group][$controller]))
{
return TRUE;
}
}
}
return FALSE;
}
public static function logged_in()
{
$user = self::user();
if(empty($user))
{
return FALSE;
}
return TRUE;
}
public static function check($group)
{
// Everyone gets star!
if($group == '*')
{
return TRUE;
}
// Simple validation
if($group == "")
{
self::error('Group not specified');
return FALSE;
}
// Load the user groups
self::load_user_groups();
if(in_array($group, self::$user_groups))
{
return TRUE;
}
return FALSE;
}
public static function login($user, $groups, $time = 0)
{
// ---------------------------------------------
// To log the user in, we need a salt to encrypt
// the data we're going to store in a cookie
// ---------------------------------------------
$salt = self::salt();
if(!$salt)
{
self::error("Invalid Salt");
return FALSE;
}
// Force groups to an array....
if(!is_array($groups))
{
$groups = array($groups);
}
// Build the cookie value
$cookie['user'] = $user;
$cookie['groups'] = $groups;
$cookie_value = crypto::encrypt($salt, serialize($cookie));
if($time > 0)
{
$time += time();
}
// Set the cookie... even for this page load to be safe
$_COOKIE[self::$cookie_name] = $cookie_value;
setcookie(self::$cookie_name, $cookie_value, $time, '/');
// Reset the user groups since they've changed
self::$user_groups = array();
}
public static function logout()
{
setcookie(self::$cookie_name, '', time() - 3600, '/');
}
public static function group($group, $config)
{
if($group == '' || !is_array($config) || count($config) == 0)
{
self::error('Invalid group configuration');
return FALSE;
}
self::$enabled = TRUE;
self::$groups[$group] = $config;
return TRUE;
}
// RETURNS this user's groups
public static function groups()
{
// Check to see if user is logged in
if(!isset($_COOKIE[self::$cookie_name]))
{
self::error('User not logged in');
return FALSE;
}
// Make sure we can decrypt the data we get back
// by generating a salt
$salt = self::salt();
if(!$salt)
{
self::error("Invalid Salt");
return FALSE;
}
// Decrypt and unserialize the value in the cookie
$decrypted_value = @unserialize(crypto::decrypt($salt, $_COOKIE[self::$cookie_name]));
if($decrypted_value === FALSE)
{
self::error('Failed decryption cookie (salt probably changed)');
return FALSE;
}
return $decrypted_value['groups'];
}
public static function user($key = NULL)
{
// Check to see if user is logged in
if(!isset($_COOKIE[self::$cookie_name]))
{
self::error('User not logged in');
return FALSE;
}
// Make sure we can decrypt the data we get back
// by generating a salt
$salt = self::salt();
if(!$salt)
{
self::error("Invalid Salt");
return FALSE;
}
// Decrypt and unserialize the value in the cookie
$decrypted_value = @unserialize(crypto::decrypt($salt, $_COOKIE[self::$cookie_name]));
if($decrypted_value === FALSE)
{
self::error('Failed decryption cookie (salt probably changed)');
return FALSE;
}
$user = $decrypted_value['user'];
// If a specific key was requested, send that value back
if($key != NULL && isset($user[$key]))
{
return $user[$key];
}
elseif($key != NULL)
{
return NULL;
}
else
{
return $user;
}
}
private static function salt()
{
if(count(self::$groups) == 0)
{
self::error("You must configure groups to login a user");
return FALSE;
}
return substr(md5(implode("-", array_keys(self::$groups))),0,24);
}
public static function set_cookie_name($name)
{
if(!empty($name))
{
self::$cookie_name = $name;
}
}
public static function error($error = "")
{
if($error == '')
{
return self::$errors;
}
else
{
self::$errors[] = $error;
}
}
}
?>