正确的方法来创建一个可供所有bundle使用的Symfony2助手类

Question

我正在为我的模型实现一个ACL系统,我想将公共代码提取到一个常见的Helper类中.我找不到任何关于如何正确做这样的事情的例子,但我经常发现有必要这样做.

例如,假设在我的控制器中我有一大块代码(从文档中获取):

      // creating the ACL
      $aclProvider = $this->get('security.acl.provider');
      $objectIdentity = ObjectIdentity::fromDomainObject($asset);
      $acl = $aclProvider->createAcl($objectIdentity);

      // retrieving the security identity of the currently logged-in user
      $securityContext = $this->get('security.context');
      $user = $securityContext->getToken()->getUser();
      $securityIdentity = UserSecurityIdentity::fromAccount($user);

      // grant owner access
      $acl->insertObjectAce($securityIdentity, MaskBuilder::MASK_OWNER);
      $aclProvider->updateAcl($acl); 

我更愿意拥有以下内容:

      $this->get('my_helpers')->bindUserToObject($asset, MaskBuilder::MASK_OWNER);

我应该如何实施'my_helpers'服务？我很确定这将是一项服务,但我仍然觉得"服务"的概念有点令人困惑.

Answer 1

好吧,出于某种原因,在这里定义我的问题的过程帮助我解决了如何做到这一点.我确实创建了一项服务.

class AclHelper {

protected $aclProvider;
protected $securityContext;
protected $logger;

    public function __construct(MutableAclProvider $aclProvider, $securityContext, $logger) {
      $this->aclProvider = $aclProvider;
      $this->securityContext = $securityContext;
      $this->logger = $logger;
    }   

    public function bindUserToObject($object, $mask) {
      // creating the ACL
      $objectIdentity = ObjectIdentity::fromDomainObject($object);
      $acl = $aclProvider->createAcl($objectIdentity);

      // retrieving the security identity of the currently logged-in user
      $user = $this->securityContext->getToken()->getUser();
      $securityIdentity = UserSecurityIdentity::fromAccount($user);

      // grant owner access
      $acl->insertObjectAce($securityIdentity, $mask);
      $aclProvider->updateAcl($acl); 
    }
}

然后我将它添加到我的services.yml文件中:

parameters:
    acl_helper.class: GC\DashboardBundle\Services\AclHelper

services:
  acl_helper:
    class:  %acl_helper.class%
    arguments: [@security.acl.provider, @security.context, @logger]

现在在我的控制器中,我所要做的就是:

$this->get('acl_helper')->bindUserToObject($object, MaskBuilder::MASK_OWNER);