BookStack/app/Entities/Managers/EntityContext.php

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<?php namespace BookStack\Entities\Managers;
use BookStack\Entities\Book;
use BookStack\Entities\Bookshelf;
use Illuminate\Session\Store;
class EntityContext
{
protected $session;
protected $KEY_SHELF_CONTEXT_ID = 'context_bookshelf_id';
/**
* EntityContextManager constructor.
*/
public function __construct(Store $session)
{
$this->session = $session;
}
/**
* Get the current bookshelf context for the given book.
*/
public function getContextualShelfForBook(Book $book): ?Bookshelf
{
$contextBookshelfId = $this->session->get($this->KEY_SHELF_CONTEXT_ID, null);
if (!is_int($contextBookshelfId)) {
return null;
}
$shelf = Bookshelf::visible()->find($contextBookshelfId);
$shelfContainsBook = $shelf && $shelf->contains($book);
return $shelfContainsBook ? $shelf : null;
}
/**
* Store the current contextual shelf ID.
* @param int $shelfId
*/
public function setShelfContext(int $shelfId)
{
$this->session->put($this->KEY_SHELF_CONTEXT_ID, $shelfId);
}
/**
* Clear the session stored shelf context id.
*/
public function clearShelfContext()
{
$this->session->forget($this->KEY_SHELF_CONTEXT_ID);
}
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}