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DIY tips: Inheriting Resources
2007-09-24 18:08:08 by Martynas Jusevičius
Often you have a situation where many Resources have to share the same properties and/or behavior. For example, all Resources in a backend administration application should deny access to users that are not logged on.
A nice and simple solution is to create a parent Resource for the whole application and let all the specific backend Resources to inherit it.
Here is an example. BackEndResource is a general Resource for the whole backend application:
class BackEndResource extends BaseBackEndResource
{
public function doGet(Request $request, Response $response)
{
$view = parent::doGet($request, $response);
if ($request->getSession()->getAttribute("user") instanceof GuestUser) $view = new ForbiddenView($this);
return $view;
}
}Other backend Resources inherit it:
class AdminResource extends BackEndResource
{
public function doGet(Request $request, Response $response)
{
$view = null;
$parent = parent::doGet($request, $response);
if ($parent != null) $view = $parent;
else $view = new AdminView($this);
return $view;
}
}If a user is accessing AdminResource or any other backend Resource and is not logged on (i. e. user object in the session is an instance of GuestUser), ForbiddenView is displayed with an appropriate message. Otherwise, AdminView is displayed as normally.
In such a way a single line of code allows you to control access to the whole application.
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