silverstripe-cms/code/Model/SiteTreeFileExtension.php

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<?php
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namespace SilverStripe\CMS\Model;
use SilverStripe\Assets\File;
use SilverStripe\Core\Convert;
use SilverStripe\Forms\FieldList;
use SilverStripe\Forms\ReadonlyField;
use SilverStripe\ORM\DataExtension;
use SilverStripe\ORM\DataObject;
use SilverStripe\ORM\ManyManyList;
use SilverStripe\ORM\Versioning\Versioned;
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use SilverStripe\View\SSViewer;
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use Subsite;
/**
* Extension applied to {@see File} object to track links to {@see SiteTree} records.
*
* {@see SiteTreeLinkTracking} for the extension applied to {@see SiteTree}
*
* Note that since both SiteTree and File are versioned, LinkTracking and ImageTracking will
* only be enabled for the Stage record.
*
* @property File $owner
*/
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class SiteTreeFileExtension extends DataExtension
{
private static $belongs_many_many = array(
'BackLinkTracking' => 'SilverStripe\\CMS\\Model\\SiteTree.ImageTracking' // {@see SiteTreeLinkTracking}
);
/**
* Images tracked by pages are owned by those pages
*
* @config
* @var array
*/
private static $owned_by = array(
'BackLinkTracking'
);
private static $casting = array(
'BackLinkHTMLList' => 'HTMLFragment'
);
public function updateCMSFields(FieldList $fields)
{
$fields->insertAfter(
'LastEdited',
ReadonlyField::create(
'BackLinkCount',
_t('AssetTableField.BACKLINKCOUNT', 'Used on:'),
$this->BackLinkTracking()->count() . ' ' . _t('AssetTableField.PAGES', 'page(s)')
)
->addExtraClass('cms-description-toggle')
->setDescription($this->BackLinkHTMLList())
);
}
/**
* Generate an HTML list which provides links to where a file is used.
*
* @return string
*/
public function BackLinkHTMLList()
{
$viewer = new SSViewer(["type" => "Includes", self::class . "_description"]);
return $viewer->process($this->owner);
}
/**
* Extend through {@link updateBackLinkTracking()} in your own {@link Extension}.
*
* @return ManyManyList
*/
public function BackLinkTracking()
{
if (class_exists("Subsite")) {
$rememberSubsiteFilter = Subsite::$disable_subsite_filter;
Subsite::disable_subsite_filter(true);
}
$links = $this->owner->getManyManyComponents('BackLinkTracking');
$this->owner->extend('updateBackLinkTracking', $links);
if (class_exists("Subsite")) {
Subsite::disable_subsite_filter($rememberSubsiteFilter);
}
return $links;
}
/**
* @todo Unnecessary shortcut for AssetTableField, coupled with cms module.
*
* @return int
*/
public function BackLinkTrackingCount()
{
$pages = $this->owner->BackLinkTracking();
if ($pages) {
return $pages->count();
} else {
return 0;
}
}
/**
* Updates link tracking in the current stage.
*/
public function onAfterDelete()
{
// Skip live stage
if (Versioned::get_stage() === Versioned::LIVE) {
return;
}
// We query the explicit ID list, because BackLinkTracking will get modified after the stage
// site does its thing
$brokenPageIDs = $this->owner->BackLinkTracking()->column("ID");
if ($brokenPageIDs) {
// This will syncLinkTracking on the same stage as this file
$brokenPages = DataObject::get('SilverStripe\\CMS\\Model\\SiteTree')->byIDs($brokenPageIDs);
foreach ($brokenPages as $brokenPage) {
$brokenPage->write();
}
}
}
}