silverstripe-cms/code/model/SiteTreeFileExtension.php

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<?php
/**
* 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
*
* @package cms
* @subpackage model
*/
class SiteTreeFileExtension extends DataExtension {
private static $belongs_many_many = array(
'BackLinkTracking' => 'SiteTree.ImageTracking' // {@see SiteTreeLinkTracking}
);
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/**
* Images tracked by pages are owned by those pages
*
* @config
* @var array
*/
private static $owned_by = array(
'BackLinkTracking'
);
public function updateCMSFields(FieldList $fields) {
$fields->insertAfter(
ReadonlyField::create(
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'BackLinkCount',
_t('AssetTableField.BACKLINKCOUNT', 'Used on:'),
$this->BackLinkTracking()->Count() . ' ' . _t('AssetTableField.PAGES', 'page(s)')
)
->addExtraClass('cms-description-toggle')
->setDescription($this->BackLinkHTMLList()),
'LastEdited'
);
}
/**
* Generate an HTML list which provides links to where a file is used.
*
* @return string
*/
public function BackLinkHTMLList() {
$html = '<em>' . _t(
'SiteTreeFileExtension.BACKLINK_LIST_DESCRIPTION',
'This list shows all pages where the file has been added through a WYSIWYG editor.'
) . '</em>';
$html .= '<ul>';
foreach ($this->BackLinkTracking() as $backLink) {
// Add the page link and CMS link
$html .= sprintf(
'<li><a href="%s" target="_blank">%s</a> &ndash; <a href="%s">%s</a></li>',
Convert::raw2att($backLink->Link()),
Convert::raw2xml($backLink->MenuTitle),
Convert::raw2att($backLink->CMSEditLink()),
_t('SiteTreeFileExtension.EDIT', 'Edit')
);
}
$html .= '</ul>';
return $html;
}
/**
* Extend through {@link updateBackLinkTracking()} in your own {@link Extension}.
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*
* @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', $links);
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if(class_exists("Subsite")){
Subsite::disable_subsite_filter($rememberSubsiteFilter);
}
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return $links;
}
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/**
* @todo Unnecessary shortcut for AssetTableField, coupled with cms module.
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*
* @return integer
*/
public function BackLinkTrackingCount() {
$pages = $this->owner->BackLinkTracking();
if($pages) {
return $pages->Count();
} else {
return 0;
}
}
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/**
* 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
$brokenPages = DataObject::get('SiteTree')->byIDs($brokenPageIDs);
foreach($brokenPages as $brokenPage) {
$brokenPage->write();
}
}
}
}