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<?php
namespace MediaWiki\Extension\AbuseFilter;
use MediaWiki\Content\Content;
use MediaWiki\Content\TextContent;
use MediaWiki\Extension\AbuseFilter\Hooks\AbuseFilterHookRunner;
use MediaWiki\Permissions\Authority;
use MediaWiki\Revision\RevisionRecord;
/**
* This service provides an interface to convert RevisionRecord and Content objects to some text
* suitable for running abuse filters.
*
* @internal No external code should rely on this representation
*/
class TextExtractor {
public const SERVICE_NAME = 'AbuseFilterTextExtractor';
/** @var AbuseFilterHookRunner */
private $hookRunner;
/**
* @param AbuseFilterHookRunner $hookRunner
*/
public function __construct( AbuseFilterHookRunner $hookRunner ) {
$this->hookRunner = $hookRunner;
}
/**
* Look up some text of a revision from its revision id
*
* Note that this is really *some* text, we do not make *any* guarantee
* that this text will be even close to what the user actually sees, or
* that the form is fit for any intended purpose.
*
* Note also that if the revision for any reason is not an Revision
* the function returns with an empty string.
*
* For now, this returns all the revision's slots, concatenated together.
* In future, this will be replaced by a better solution. See T208769 for
* discussion.
*
* @param RevisionRecord|null $revision a valid revision
* @param Authority $performer to check for privileged access
* @return string the content of the revision as some kind of string,
* or an empty string if it can not be found
* @return-taint none
*/
public function revisionToString( ?RevisionRecord $revision, Authority $performer ): string {
if ( !$revision ) {
return '';
}
$strings = [];
foreach ( $revision->getSlotRoles() as $role ) {
$content = $revision->getContent( $role, RevisionRecord::FOR_THIS_USER, $performer );
if ( $content === null ) {
continue;
}
$strings[$role] = $this->contentToString( $content );
}
return implode( "\n\n", $strings );
}
/**
* Converts the given Content object to a string.
*
* This uses TextContent::getText() if $content is an instance of TextContent,
* or Content::getTextForSearchIndex() otherwise.
*
* The hook AbuseFilterContentToString can be used to override this
* behavior.
*
* @param Content $content
*
* @return string a suitable string representation of the content.
*/
public function contentToString( Content $content ): string {
$text = null;
if ( $this->hookRunner->onAbuseFilter_contentToString(
$content,
$text
) ) {
$text = $content instanceof TextContent
? $content->getText()
: $content->getTextForSearchIndex();
}
// T22310
return TextContent::normalizeLineEndings( (string)$text );
}
}