PHP-Casbin 是一个强大的、高效的开源访问控制框架，它支持基于各种访问控制模型的权限管理。

这里使用官方提供的数据库适配器扩展：Database adapter.

安装

通过composer安装：

composer require casbin/casbin
composer require casbin/database-adapter

使用 RBAC Model

model.conf 如下:

[request_definition]
r = sub, obj, act

[policy_definition]
p = sub, obj, act

#  RBAC角色继承关系的定义
[role_definition]
g = _, _

[policy_effect]
e = some(where (p.eft == allow))

[matchers]
m = g(r.sub, p.sub) && keyMatch2(r.obj, p.obj) && regexMatch(r.act, p.act)

初始化一个Casbin enforcer

use Casbin\Enforcer;
use CasbinAdapter\Database\Adapter;

$adapter = Adapter::newAdapter([
    'type'     => 'mysql', 
    'hostname' => '127.0.0.1',
    'database' => 'test',
    'username' => 'root',
]);

$enforcer = new Enforcer('path/to/model.conf', $adapter);

添加策略

给alice和bob分配角色：

// alice has the admin role
$enforcer->addRoleForUser('alice', 'admin'); 
// bob has the member role
$enforcer->addRoleForUser('bob', 'member');

给member角色分配权限，member 角色仅对foo资源有查看权限:

$enforcer->addPermissionForUser('member', '/foo', 'GET');
$enforcer->addPermissionForUser('member', '/foo/:id', 'GET');

admin角色对foo拥有增删改查权限：

// admin inherits all permissions of member
$enforcer->addRoleForUser('admin', 'member');

$enforcer->addPermissionForUser('admin', '/foo', 'POST');
$enforcer->addPermissionForUser('admin', '/foo/:id', 'PUT');
$enforcer->addPermissionForUser('admin', '/foo/:id', 'DELETE');

分配完角色和权限后，数据库中的策略规则大致如下：

g, alice, admin
g, bob, member

p, memeber, /foo, GET
p, memeber, /foo/:id, GET

g, admin, member

p, admin, /foo, POST
p, admin, /foo/:id, PUT
p, admin, /foo/:id, DELETE

验证权限

alice 具有admin角色，继承admin和member两个角色的全部权限.

$enforcer->enforce('alice', '/foo', 'GET'); // true
$enforcer->enforce('alice', '/foo', 'GET'); // true

$enforcer->enforce('alice', '/foo', 'POST'); // true
$enforcer->enforce('alice', '/foo/1', 'PUT'); // true
$enforcer->enforce('alice', '/foo/1', 'DELETE'); // true

bob 具有member角色, 只继承member的权限.

$enforcer->enforce('bob', '/foo', 'GET'); // true
$enforcer->enforce('bob', '/foo', 'GET'); // true

$enforcer->enforce('bob', '/foo', 'POST'); // false
$enforcer->enforce('bob', '/foo/1', 'PUT'); // false
$enforcer->enforce('bob', '/foo/1', 'DELETE'); // false