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ability.php
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ability.php
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<?php namespace Authority;
/**
* Authority
*
* Authority is an authorization library for CodeIgniter 2+ and PHPActiveRecord
* This library is inspired by, and largely based off, Ryan Bates' CanCan gem
* for Ruby on Rails. It is not a 1:1 port, but the essentials are available.
* Please check out his work at http://github.com/ryanb/cancan/
*
* @package Authority
* @version 0.0.3
* @author Matthew Machuga
* @license MIT License
* @copyright 2011 Matthew Machuga
* @link http://github.com/machuga
*
**/
use Laravel\Config;
use Laravel\Auth;
abstract class Ability {
protected static $_rules = array();
protected static $_action_aliases = array();
public static function initialize($user)
{
$config = Config::get('authority::authority');
call_user_func($config['initialize'], $user);
}
public static function can($action, $resource, $resource_val = null)
{
if ( empty(static::$_rules))
{
static::initialize(static::current_user());
}
// See if the action has been aliased to somethign else
$true_action = static::determine_action($action);
$matches = static::find_matches($true_action, $resource);
if ($matches && ! empty($matches))
{
$results = array();
$resource_value = ($resource_val) ?: $resource;
foreach ($matches as $matched_rule)
{
$allowed = !(($cb = $matched_rule->callback($resource_value)) xor $matched_rule->allowed());
$results[] = $allowed ? $cb : false;
}
// Last rule overrides others
return $results[count($results)-1];
}
else
{
return false;
}
}
public static function cannot($action, $resource, $resource_val = null)
{
return ! static::can($action, $resource, $resource_val);
}
public static function allow($action, $resource, \Closure $callback = null)
{
static::$_rules[] = new Rule(true, $action, $resource, $callback);
}
public static function deny($action, $resource, \Closure $callback = null)
{
static::$_rules[] = new Rule(false, $action, $resource, $callback);
}
public static function action_alias($action, Array $aliases)
{
static::$_action_aliases[$action] = $aliases;
}
public static function dealias($action)
{
return static::$_action_aliases[$action] ?: $action;
}
protected static function determine_action($action)
{
$actions = array();
if ( ! empty(static::$_action_aliases))
{
foreach (static::$_action_aliases as $aliased_action => $aliases)
{
if ( ! empty($aliases) && in_array($action, $aliases))
{
$actions[] = $aliased_action;
}
}
}
if (empty($actions))
{
return $action;
}
else
{
$actions[] = $action;
return $actions;
}
}
protected static function find_matches($action, $resource)
{
$matches = array();
if ( ! empty(static::$_rules))
{
foreach(static::$_rules as $rule)
{
if ($rule->relevant($action, $resource))
{
$matches[] = $rule;
}
}
}
return $matches;
}
public function __construct()
{
static::initialize(static::current_user());
}
protected static function current_user()
{
return Auth::user() ?: new User;
}
}