mediawiki-extensions-Discus.../includes/CommentFormatter.php

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<?php
namespace MediaWiki\Extension\DiscussionTools;
use DOMDocument;
use DOMElement;
use Language;
use MediaWiki\Extension\DiscussionTools\Hooks\HookUtils;
use MediaWiki\MediaWikiServices;
use MediaWiki\User\UserIdentity;
use MWExceptionHandler;
use Throwable;
use WebRequest;
use Wikimedia\Parsoid\Utils\DOMCompat;
use Wikimedia\Parsoid\Utils\DOMUtils;
use Wikimedia\Parsoid\Wt2Html\XMLSerializer;
class CommentFormatter {
// List of features which, when enabled, cause the comment formatter to run
public const USE_WITH_FEATURES = [
HookUtils::REPLYTOOL,
HookUtils::TOPICSUBSCRIPTION,
];
protected const MARKER_COMMENT = '<!-- DiscussionTools addDiscussionTools called -->';
// Compatibility with old cached content
protected const REPLY_LINKS_COMMENT = '<!-- DiscussionTools addReplyLinks called -->';
/**
* Get a comment parser object for a DOM element
*
* This method exists so it can mocked in tests.
*
* @param DOMElement $container
* @return CommentParser
*/
protected static function getParser( DOMElement $container ) : CommentParser {
return CommentParser::newFromGlobalState( $container );
}
/**
* Add discussion tools to some HTML
*
* @param string &$text Parser text output
*/
public static function addDiscussionTools( string &$text ) : void {
$start = microtime( true );
// Never add tools twice.
// This is required because we try again to add tools to cached content
// to support query string or cookie enabling
if ( strpos( $text, static::MARKER_COMMENT ) !== false ) {
return;
}
// Compatibility with old cached content
if ( strpos( $text, static::REPLY_LINKS_COMMENT ) !== false ) {
return;
}
$text = $text . "\n" . static::MARKER_COMMENT;
try {
$newText = static::addDiscussionToolsInternal( $text );
} catch ( Throwable $e ) {
// Catch errors, so that they don't cause the entire page to not display.
// Log it and add the request ID in a comment to make it easier to find in the logs.
MWExceptionHandler::logException( $e );
$requestId = htmlspecialchars( WebRequest::getRequestId() );
$info = "<!-- [$requestId] DiscussionTools could not process this page -->";
$text .= "\n" . $info;
return;
}
$text = $newText;
$duration = microtime( true ) - $start;
$stats = MediaWikiServices::getInstance()->getStatsdDataFactory();
$stats->timing( 'discussiontools.addReplyLinks', $duration * 1000 );
}
/**
* Add discussion tools to some HTML
*
* @param string $html HTML
* @return string HTML with discussion tools
*/
protected static function addDiscussionToolsInternal( string $html ) : string {
// The output of this method can end up in the HTTP cache (Varnish). Avoid changing it;
// and when doing so, ensure that frontend code can handle both the old and new outputs.
// See controller#init in JS.
$doc = DOMUtils::parseHTML( $html );
$doc->preserveWhiteSpace = false;
$container = $doc->getElementsByTagName( 'body' )->item( 0 );
if ( !( $container instanceof DOMElement ) ) {
return $html;
}
$parser = static::getParser( $container );
$threadItems = $parser->getThreadItems();
foreach ( $threadItems as $threadItem ) {
// TODO: Consider not attaching JSON data to the DOM.
// Create a dummy node to attach data to.
if ( $threadItem instanceof HeadingItem && $threadItem->isPlaceholderHeading() ) {
$node = $doc->createElement( 'span' );
$container->insertBefore( $node, $container->firstChild );
$threadItem->setRange( new ImmutableRange( $node, 0, $node, 0 ) );
}
// And start and end markers to range
$id = $threadItem->getId();
$range = $threadItem->getRange();
$startMarker = $doc->createElement( 'span' );
$startMarker->setAttribute( 'data-mw-comment-start', '' );
$startMarker->setAttribute( 'id', $id );
$endMarker = $doc->createElement( 'span' );
$endMarker->setAttribute( 'data-mw-comment-end', $id );
// Extend the range if the start or end is inside an element which can't have element children.
// (There may be other problematic elements... but this seems like a good start.)
if ( CommentUtils::cantHaveElementChildren( $range->startContainer ) ) {
$range = $range->setStart(
$range->startContainer->parentNode,
CommentUtils::childIndexOf( $range->startContainer )
);
}
if ( CommentUtils::cantHaveElementChildren( $range->endContainer ) ) {
$range = $range->setEnd(
$range->endContainer->parentNode,
CommentUtils::childIndexOf( $range->endContainer ) + 1
);
}
$range->setStart( $range->endContainer, $range->endOffset )->insertNode( $endMarker );
$range->insertNode( $startMarker );
$itemData = $threadItem->jsonSerialize();
$itemJSON = json_encode( $itemData );
if ( $threadItem instanceof HeadingItem ) {
$threadItem->getRange()->endContainer->setAttribute( 'data-mw-comment', $itemJSON );
if ( !$threadItem->isPlaceholderHeading() && $threadItem->getHeadingLevel() === 2 ) {
$headingNode = CommentUtils::closestElement( $threadItem->getRange()->endContainer, [ 'h2' ] );
if ( $headingNode ) {
$existingClass = $headingNode->getAttribute( 'class' );
$headingNode->setAttribute(
'class',
( $existingClass ? $existingClass . ' ' : '' ) . 'ext-discussiontools-section'
);
// Replaced in ::postprocessTopicSubscription() as the icon depends on user state
$subscribe = $doc->createComment( '__DTSUBSCRIBE__' . $threadItem->getName() );
$headingNode->appendChild( $subscribe );
}
}
} elseif ( $threadItem instanceof CommentItem ) {
$replyLinkButtons = $doc->createElement( 'span' );
$replyLinkButtons->setAttribute( 'class', 'ext-discussiontools-init-replylink-buttons' );
// Reply
$replyLink = $doc->createElement( 'a' );
$replyLink->setAttribute( 'class', 'ext-discussiontools-init-replylink-reply' );
$replyLink->setAttribute( 'role', 'button' );
$replyLink->setAttribute( 'tabindex', '0' );
$replyLink->setAttribute( 'data-mw-comment', $itemJSON );
// Set empty 'href' to avoid a:not([href]) selector in MobileFrontend
$replyLink->setAttribute( 'href', '' );
// Replaced in ::postprocessReplyTool() as the label depends on user language
$replyText = $doc->createComment( '__DTREPLY__' );
$replyLink->appendChild( $replyText );
$bracket = $doc->createElement( 'span' );
$bracket->setAttribute( 'class', 'ext-discussiontools-init-replylink-bracket' );
$bracketLeft = $bracket->cloneNode( false );
$bracketLeft->nodeValue = '[';
$bracketRight = $bracket->cloneNode( false );
$bracketRight->nodeValue = ']';
$replyLinkButtons->appendChild( $bracketLeft );
$replyLinkButtons->appendChild( $replyLink );
$replyLinkButtons->appendChild( $bracketRight );
CommentModifier::addReplyLink( $threadItem, $replyLinkButtons );
}
}
$docElement = $doc->getElementsByTagName( 'body' )->item( 0 );
if ( !( $docElement instanceof DOMElement ) ) {
return $html;
}
// Like DOMCompat::getInnerHTML(), but disable 'smartQuote' for compatibility with
// ParserOutput::EDITSECTION_REGEX matching 'mw:editsection' tags (T274709)
return XMLSerializer::serialize( $docElement, [ 'innerXML' => true, 'smartQuote' => false ] )['html'];
}
/**
* Replace placeholders for topic subscription buttons with the real thing.
*
* @param string $text
* @param Language $lang
* @param SubscriptionStore $subscriptionStore
* @param UserIdentity $user
* @return string
*/
public static function postprocessTopicSubscription(
string $text, Language $lang, SubscriptionStore $subscriptionStore, UserIdentity $user
) : string {
$doc = new DOMDocument();
$text = preg_replace_callback(
'/<!--__DTSUBSCRIBE__(.*?)-->/',
function ( $matches ) use ( $doc, $subscriptionStore, $user ) {
$itemName = $matches[1];
$items = $subscriptionStore->getSubscriptionItemsForUser(
$user,
$itemName
);
$isSubscribed = count( $items ) && !$items[0]->isMuted();
$subscribe = $doc->createElement( 'span' );
$subscribe->setAttribute(
'class',
'ext-discussiontools-section-subscribe ' .
( $isSubscribed ? 'oo-ui-icon-unStar oo-ui-image-progressive' : 'oo-ui-icon-star' )
);
$subscribe->setAttribute( 'data-mw-comment-name', $itemName );
return DOMCompat::getOuterHTML( $subscribe );
},
$text
);
return $text;
}
/**
* Replace placeholders for reply links with the real thing.
*
* @param string $text
* @param Language $lang
* @return string
*/
public static function postprocessReplyTool(
string $text, Language $lang
) {
$replyText = wfMessage( 'discussiontools-replylink' )->inLanguage( $lang )->escaped();
$text = str_replace( '<!--__DTREPLY__-->', $replyText, $text );
return $text;
}
}