BeforeRecordIsAnalyzedEvent
The PSR-14 event
\TYPO3\
allows to modify results (= add results) or modify the record
before LinkValidator analyzes the record.
Example
In this example we are checking if there are external links containing the URL of the project itself, as editors tend to set external links on internal pages at times.
The following code can be put in a custom extension, for example kickstarted with make. You can find a live example in our example extension EXT:examples.
Create a class that works as event listener. This class does not implement or
extend any class. It has to provide a method that accepts an event of type
\TYPO3\. By default,
the method is called __:
use TYPO3\CMS\Linkvalidator\Event\BeforeRecordIsAnalyzedEvent;
final class CheckExternalLinksToLocalPagesEventListener
{
private const LOCAL_DOMAIN = 'example.org';
private const TABLE_NAME = 'tt_content';
private const FIELD_NAME = 'bodytext';
public function __invoke(BeforeRecordIsAnalyzedEvent $event): void
{
$table = $event->getTableName();
if ($table !== self::TABLE_NAME) {
return;
}
$results = $event->getResults();
$record = $event->getRecord();
$field = (string)$record[self::FIELD_NAME];
if (!str_contains($field, self::LOCAL_DOMAIN)) {
return;
}
$results = $this->parseField($record, $results);
$event->setResults($results);
}
}The listener must then be registered in the extensions Services.:
services:
# Place here the default dependency injection configuration
T3docs\Examples\EventListener\LinkValidator\CheckExternalLinksToLocalPagesEventListener:
tags:
- name: event.listener
identifier: 'txExampleCheckExternalLinksToLocalPages'
Read how to configure dependency injection in extensions.
For the implementation we need the
\TYPO3\ to register
additional link errors and the
\TYPO3\ so
we can automatically parse for links. These two classes have to be injected via
dependency injection:
use TYPO3\CMS\Core\DataHandling\SoftReference\SoftReferenceParserFactory;
use TYPO3\CMS\Linkvalidator\Repository\BrokenLinkRepository;
final class CheckExternalLinksToLocalPagesEventListener
{
public function __construct(
private readonly BrokenLinkRepository $brokenLinkRepository,
private readonly SoftReferenceParserFactory $softReferenceParserFactory,
) {}
}Now we use the Soft to find all registered link
parsers for a soft reference. Then we apply each of these parsers in turn to
the configured field in the current record. For each link found we can now
match, if it is an external link to an internal page.
final class CheckExternalLinksToLocalPagesEventListener
{
private const LOCAL_DOMAIN = 'example.org';
private const TABLE_NAME = 'tt_content';
private const FIELD_NAME = 'bodytext';
private function parseField(array $record, array $results): array
{
$conf = $GLOBALS['TCA'][self::TABLE_NAME]['columns'][self::FIELD_NAME]['config'];
foreach ($this->findAllParsers($conf) as $softReferenceParser) {
$parserResult = $softReferenceParser->parse(
self::TABLE_NAME,
self::FIELD_NAME,
$record['uid'],
(string)$record[self::FIELD_NAME]
);
if (!$parserResult->hasMatched()) {
continue;
}
foreach ($parserResult->getMatchedElements() as $matchedElement) {
if (!isset($matchedElement['subst'])) {
continue;
}
$this->matchUrl(
(string)$matchedElement['subst']['tokenValue'],
$record,
$results
);
}
}
return $results;
}
private function findAllParsers(array $conf): iterable
{
return $this->softReferenceParserFactory->getParsersBySoftRefParserList(
$conf['softref'],
['subst']
);
}
}If the URL found in the matching is external and contains the local domain name
we add an entry to the Broken and to the result set of
Before.
final class CheckExternalLinksToLocalPagesEventListener
{
private const LOCAL_DOMAIN = 'example.org';
private const TABLE_NAME = 'tt_content';
private const FIELD_NAME = 'bodytext';
private function matchUrl(string $foundUrl, array $record, array &$results): void
{
if (str_contains($foundUrl, self::LOCAL_DOMAIN)) {
$this->addItemToBrokenLinkRepository($record, $foundUrl);
$results[] = $record;
}
}
private function addItemToBrokenLinkRepository(array $record, string $foundUrl): void
{
$link = [
'record_uid' => $record['uid'],
'record_pid' => $record['pid'],
'language' => $record['sys_language_uid'],
'field' => self::FIELD_NAME,
'table_name' => self::TABLE_NAME,
'url' => $foundUrl,
'last_check' => time(),
'link_type' => 'external',
];
$this->brokenLinkRepository->addBrokenLink($link, false, [
'errorType' => 'exception',
'exception' => 'Do not link externally to ' . self::LOCAL_DOMAIN,
'errno' => 1661517573,
]);
}
}The Broken is not an Extbase repository but a repository
based on the Doctrine database abstraction (DBAL).
Therefore, it expects an array with the names of the table fields as argument
and not an Extbase model. The method internally uses
\TYPO3\CMS\Core\Database\Connection::insert.
This method automatically quotes all identifiers and values, therefore we do not
need to worry about escaping here.
Tip
It is recommended to always use a unique error number. An easy way to ensure the error number to be unique is to use the current Unix timestamp of the time of writing the code.
See the complete class here: CheckExternalLinksToLocalPagesEventListener.