在scala模板中制作菜单,其中包含一些授权链接,如下所示:
<ul>
<li><a href="@routes.Application.index()">Home</a></li>
@subjectNotPresent() {
<li><a href="@routes.Application.login()">Login</a></li>
}
@@restrict(handler, List(as("foo"))) {
<li><a href="@routes.Application.foo()">foo</a></li>
}
@subjectPresent() {
<li><a href="@routes.Application.logout()">Logout</a></li>
}
</ul>
我指向Application.foo的链接需要放置角色foo。但是,我想将此语句@@restrict(handler, List(as("foo")))
更改为更动态的语句。我想询问用户是否也访问了application.foo ,而不是询问用户是否有角色foo。
这使得菜单不那么复杂。一个重要的好处是只需要在控制器中修改限制,而不是scala模板。
这可能吗?
答案 0 :(得分:0)
您可以使用动态标记,它可以完全满足您的需求。你可以在http://deadbolt-2-scala.herokuapp.com/#template-dynamic看到一个例子来说明这一点。要在这里充实,
@dynamic(handler, "foo") {
This content may be visible, depending on your luck
}
其中foo是您要限制的资源的名称。在DeadboltHandler中,您需要返回一个定义动态控件的DynamicResourceHandler。
class MyDeadboltHandler(dynamicResourceHandler: Option[DynamicResourceHandler] = None) extends DeadboltHandler {
override def getDynamicResourceHandler[A](request: Request[A]): Option[DynamicResourceHandler] = {
if (dynamicResourceHandler.isDefined) dynamicResourceHandler
else Some(new MyDynamicResourceHandler())
}
}
DynamicResourceHandler可以通过多种方式实现,但外观通常很有效。为了简化示例,我们将在这种情况下对值进行硬编码。
class MyDynamicResourceHandler extends DynamicResourceHandler
{
def isAllowed[A](name: String, meta: String, handler: DeadboltHandler, request: Request[A]) = {
MyDynamicResourceHandler.handlers(name).isAllowed(name,
meta,
handler,
request)
}
def checkPermission[A](permissionValue: String, deadboltHandler: DeadboltHandler, request: Request[A]) = {
// todo implement this when demonstrating permissions
false
}
}
object MyDynamicResourceHandler {
val handlers: Map[String, DynamicResourceHandler] = Map(
"foo" -> new DynamicResourceHandler() {
def isAllowed[A](name: String, meta: String, deadboltHandler: DeadboltHandler, request: Request[A]) =
// do something here to determine if the subject has access
def checkPermission[A](permissionValue: String, deadboltHandler: DeadboltHandler, request: Request[A]) = false
}
)
}