silverstripe-cms/code/model/SiteTreeLinkTracking.php

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<?php
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/**
* @package cms
* @subpackage model
*/
/**
* Adds tracking of links in any HTMLText fields which reference SiteTree or File items.
*
* Attaching this to any DataObject will add four fields which contain all links to SiteTree and File items
* referenced in any HTMLText fields, and two booleans to indicate if there are any broken links. Call
* augmentSyncLinkTracking to update those fields with any changes to those fields.
*
* @property SiteTree owner
*
* @property bool HasBrokenFile
* @property bool HasBrokenLink
*
* @method ManyManyList LinkTracking List of site pages linked on this page.
* @method ManyManyList ImageTracking List of Images linked on this page.
*/
class SiteTreeLinkTracking extends DataExtension {
public $parser;
private static $dependencies = array(
'parser' => '%$SiteTreeLinkTracking_Parser'
);
private static $db = array(
"HasBrokenFile" => "Boolean",
"HasBrokenLink" => "Boolean"
);
private static $many_many = array(
"LinkTracking" => "SiteTree",
"ImageTracking" => "File"
);
private static $many_many_extraFields = array(
"LinkTracking" => array("FieldName" => "Varchar"),
"ImageTracking" => array("FieldName" => "Varchar")
);
/**
* Scrape the content of a field to detect anly links to local SiteTree pages or files
*
* @param string $fieldName The name of the field on {@link @owner} to scrape
*/
public function trackLinksInField($fieldName) {
$record = $this->owner;
$linkedPages = array();
$linkedFiles = array();
$htmlValue = Injector::inst()->create('HTMLValue', $record->$fieldName);
$links = $this->parser->process($htmlValue);
// Highlight broken links in the content.
foreach ($links as $link) {
$classStr = trim($link['DOMReference']->getAttribute('class'));
if (!$classStr) {
$classes = array();
} else {
$classes = explode(' ', $classStr);
}
// Add or remove the broken class from the link, depending on the link status.
if ($link['Broken']) {
$classes = array_unique(array_merge($classes, array('ss-broken')));
} else {
$classes = array_diff($classes, array('ss-broken'));
}
if (!empty($classes)) {
$link['DOMReference']->setAttribute('class', implode(' ', $classes));
} else {
$link['DOMReference']->removeAttribute('class');
}
}
$record->$fieldName = $htmlValue->getContent();
// Populate link tracking for internal links & links to asset files.
foreach ($links as $link) {
switch ($link['Type']) {
case 'sitetree':
if ($link['Broken']) {
$record->HasBrokenLink = true;
} else {
$linkedPages[] = $link['Target'];
}
break;
case 'file':
if ($link['Broken']) {
$record->HasBrokenFile = true;
} else {
$linkedFiles[] = $link['Target'];
}
break;
default:
if ($link['Broken']) {
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$record->HasBrokenLink = true;
}
break;
}
}
// Add file tracking for image references
if($images = $htmlValue->getElementsByTagName('img')) foreach($images as $img) {
if($image = File::find($path = urldecode(Director::makeRelative($img->getAttribute('src'))))) {
$linkedFiles[] = $image->ID;
} else {
if(substr($path, 0, strlen(ASSETS_DIR) + 1) == ASSETS_DIR . '/') {
$record->HasBrokenFile = true;
}
}
}
// Update the "LinkTracking" many_many
if($record->ID && $record->manyManyComponent('LinkTracking') && $tracker = $record->LinkTracking()) {
$tracker->removeByFilter(sprintf(
'"FieldName" = \'%s\' AND "%s" = %d',
$fieldName,
$tracker->getForeignKey(),
$record->ID
));
if($linkedPages) foreach($linkedPages as $item) {
$tracker->add($item, array('FieldName' => $fieldName));
}
}
// Update the "ImageTracking" many_many
if($record->ID && $record->manyManyComponent('ImageTracking') && $tracker = $record->ImageTracking()) {
$tracker->removeByFilter(sprintf(
'"FieldName" = \'%s\' AND "%s" = %d',
$fieldName,
$tracker->getForeignKey(),
$record->ID
));
if($linkedFiles) foreach($linkedFiles as $item) {
$tracker->add($item, array('FieldName' => $fieldName));
}
}
}
/**
* Find HTMLText fields on {@link owner} to scrape for links that need tracking
*/
public function augmentSyncLinkTracking() {
// Reset boolean broken flags
$this->owner->HasBrokenLink = false;
$this->owner->HasBrokenFile = false;
// Build a list of HTMLText fields
$allFields = $this->owner->db();
$htmlFields = array();
foreach($allFields as $field => $fieldSpec) {
if(preg_match('/([^(]+)/', $fieldSpec, $matches)) {
$class = $matches[0];
if(class_exists($class)){
if($class == 'HTMLText' || is_subclass_of($class, 'HTMLText')) $htmlFields[] = $field;
}
}
}
foreach($htmlFields as $field) $this->trackLinksInField($field);
}
}
/**
* A helper object for extracting information about links.
*/
class SiteTreeLinkTracking_Parser {
/**
* Finds the links that are of interest for the link tracking automation. Checks for brokenness and attaches
* extracted metadata so consumers can decide what to do with the DOM element (provided as DOMReference).
*
* @param SS_HTMLValue $htmlValue Object to parse the links from.
* @return array Associative array containing found links with the following field layout:
* Type: string, name of the link type
* Target: any, a reference to the target object, depends on the Type
* Anchor: string, anchor part of the link
* DOMReference: DOMElement, reference to the link to apply changes.
* Broken: boolean, a flag highlighting whether the link should be treated as broken.
*/
public function process(SS_HTMLValue $htmlValue) {
$results = array();
$links = $htmlValue->getElementsByTagName('a');
if(!$links) return $results;
foreach($links as $link) {
if (!$link->hasAttribute('href')) continue;
$href = Director::makeRelative($link->getAttribute('href'));
// Definitely broken links.
if($href == '' || $href[0] == '/') {
$results[] = array(
'Type' => 'broken',
'Target' => null,
'Anchor' => null,
'DOMReference' => $link,
'Broken' => true
);
continue;
}
// Link to a page on this site.
$matches = array();
if(preg_match('/\[sitetree_link(?:\s*|%20|,)?id=([0-9]+)\](#(.*))?/i', $href, $matches)) {
$page = DataObject::get_by_id('SiteTree', $matches[1]);
if (!$page) {
// Page doesn't exist.
$broken = true;
} else if (!empty($matches[3]) && !preg_match("/(name|id)=\"{$matches[3]}\"/", $page->Content)) {
// Broken anchor on the target page.
$broken = true;
} else {
$broken = false;
}
$results[] = array(
'Type' => 'sitetree',
'Target' => $matches[1],
'Anchor' => empty($matches[3]) ? null : $matches[3],
'DOMReference' => $link,
'Broken' => $broken
);
continue;
}
// Link to a file on this site.
$matches = array();
if(preg_match('/\[file_link(?:\s*|%20|,)?id=([0-9]+)\]/i', $href, $matches)) {
$results[] = array(
'Type' => 'file',
'Target' => $matches[1],
'Anchor' => null,
'DOMReference' => $link,
'Broken' => !DataObject::get_by_id('File', $matches[1])
);
continue;
}
// Local anchor.
$matches = array();
if(preg_match('/^#(.*)/i', $href, $matches)) {
$results[] = array(
'Type' => 'localanchor',
'Target' => null,
'Anchor' => $matches[1],
'DOMReference' => $link,
'Broken' => !preg_match("#(name|id)=\"{$matches[1]}\"#", $htmlValue->getContent())
);
continue;
}
}
return $results;
}
}