silverstripe-framework/Assets/AssetManipulationList.php

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<?php
namespace SilverStripe\Assets;
/**
* Provides a mechanism for determining the effective visibility of a set of assets (identified by
* filename and hash), given their membership to objects of varying visibility.
*
* The effective visibility of assets is based on three rules:
* - If an asset is attached to any public record, that asset is public.
* - If an asset is not attached to any public record, but is attached to a protected record,
* that asset is protected.
* - If an asset is attached to a record being deleted, but not any existing public or protected
* record, then that asset is marked for deletion.
*
* Variants are ignored for the purpose of determining visibility
*/
class AssetManipulationList
{
const STATE_PUBLIC = 'public';
const STATE_PROTECTED = 'protected';
const STATE_DELETED = 'deleted';
/**
* List of public assets
*
* @var array
*/
protected $public = array();
/**
* List of protected assets
*
* @var array
*/
protected $protected = array();
/**
* List of deleted assets
*
* @var array
*/
protected $deleted = array();
/**
* Get an identifying key for a given filename and hash
*
* @param array $asset Asset tuple
* @return string
*/
protected function getAssetKey($asset)
{
return $asset['Hash'] . '/' . $asset['Filename'];
}
/**
* Add asset with the given state
*
* @param array $asset Asset tuple
* @param string $state One of the STATE_* const vars
* @return bool True if the asset was added to the set matching the given state
*/
public function addAsset($asset, $state)
{
switch ($state) {
case self::STATE_PUBLIC:
return $this->addPublicAsset($asset);
case self::STATE_PROTECTED:
return $this->addProtectedAsset($asset);
case self::STATE_DELETED:
return $this->addDeletedAsset($asset);
default:
throw new \InvalidArgumentException("Invalid state {$state}");
}
}
/**
* Mark a file as public
*
* @param array $asset Asset tuple
* @return bool True if the asset was added to the public set
*/
public function addPublicAsset($asset)
{
// Remove from protected / deleted lists
$key = $this->getAssetKey($asset);
unset($this->protected[$key]);
unset($this->deleted[$key]);
// Skip if already public
if(isset($this->public[$key])) {
return false;
}
unset($asset['Variant']);
$this->public[$key] = $asset;
return true;
}
/**
* Record an asset as protected
*
* @param array $asset Asset tuple
* @return bool True if the asset was added to the protected set
*/
public function addProtectedAsset($asset)
{
$key = $this->getAssetKey($asset);
// Don't demote from public
if (isset($this->public[$key])) {
return false;
}
unset($this->deleted[$key]);
// Skip if already protected
if(isset($this->protected[$key])) {
return false;
}
unset($asset['Variant']);
$this->protected[$key] = $asset;
return true;
}
/**
* Record an asset as deleted
*
* @param array $asset Asset tuple
* @return bool True if the asset was added to the deleted set
*/
public function addDeletedAsset($asset)
{
$key = $this->getAssetKey($asset);
// Only delete if this doesn't exist in any non-deleted state
if (isset($this->public[$key]) || isset($this->protected[$key])) {
return false;
}
// Skip if already deleted
if(isset($this->deleted[$key])) {
return false;
}
unset($asset['Variant']);
$this->deleted[$key] = $asset;
return true;
}
/**
* Get all public assets
*
* @return array
*/
public function getPublicAssets()
{
return $this->public;
}
/**
* Get protected assets
*
* @return array
*/
public function getProtectedAssets()
{
return $this->protected;
}
/**
* Get deleted assets
*
* @return array
*/
public function getDeletedAssets()
{
return $this->deleted;
}
}