mirror of
https://gerrit.wikimedia.org/r/mediawiki/extensions/DiscussionTools
synced 2024-12-01 03:26:28 +00:00
298 lines
10 KiB
PHP
298 lines
10 KiB
PHP
<?php
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namespace MediaWiki\Extension\DiscussionTools;
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use DOMDocument;
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use DOMElement;
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use Language;
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use MediaWiki\Extension\DiscussionTools\Hooks\HookUtils;
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use MediaWiki\MediaWikiServices;
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use MediaWiki\User\UserIdentity;
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use MWExceptionHandler;
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use Throwable;
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use WebRequest;
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use Wikimedia\Parsoid\Utils\DOMCompat;
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use Wikimedia\Parsoid\Utils\DOMUtils;
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use Wikimedia\Parsoid\Wt2Html\XMLSerializer;
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class CommentFormatter {
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// List of features which, when enabled, cause the comment formatter to run
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public const USE_WITH_FEATURES = [
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HookUtils::REPLYTOOL,
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HookUtils::TOPICSUBSCRIPTION,
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];
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protected const MARKER_COMMENT = '<!-- DiscussionTools addDiscussionTools called -->';
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// Compatibility with old cached content
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protected const REPLY_LINKS_COMMENT = '<!-- DiscussionTools addReplyLinks called -->';
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/**
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* Get a comment parser object for a DOM element
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*
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* This method exists so it can mocked in tests.
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*
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* @param DOMElement $container
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* @return CommentParser
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*/
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protected static function getParser( DOMElement $container ) : CommentParser {
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return CommentParser::newFromGlobalState( $container );
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}
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/**
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* Add discussion tools to some HTML
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*
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* @param string &$text Parser text output
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*/
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public static function addDiscussionTools( string &$text ) : void {
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$start = microtime( true );
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// Never add tools twice.
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// This is required because we try again to add tools to cached content
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// to support query string or cookie enabling
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if ( strpos( $text, static::MARKER_COMMENT ) !== false ) {
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return;
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}
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// Compatibility with old cached content
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if ( strpos( $text, static::REPLY_LINKS_COMMENT ) !== false ) {
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return;
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}
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$text = $text . "\n" . static::MARKER_COMMENT;
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try {
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$newText = static::addDiscussionToolsInternal( $text );
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} catch ( Throwable $e ) {
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// Catch errors, so that they don't cause the entire page to not display.
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// Log it and add the request ID in a comment to make it easier to find in the logs.
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MWExceptionHandler::logException( $e );
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$requestId = htmlspecialchars( WebRequest::getRequestId() );
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$info = "<!-- [$requestId] DiscussionTools could not process this page -->";
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$text .= "\n" . $info;
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return;
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}
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$text = $newText;
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$duration = microtime( true ) - $start;
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$stats = MediaWikiServices::getInstance()->getStatsdDataFactory();
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$stats->timing( 'discussiontools.addReplyLinks', $duration * 1000 );
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}
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/**
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* Add discussion tools to some HTML
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*
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* @param string $html HTML
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* @return string HTML with discussion tools
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*/
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protected static function addDiscussionToolsInternal( string $html ) : string {
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// The output of this method can end up in the HTTP cache (Varnish). Avoid changing it;
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// and when doing so, ensure that frontend code can handle both the old and new outputs.
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// See controller#init in JS.
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$doc = DOMUtils::parseHTML( $html );
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$doc->preserveWhiteSpace = false;
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$container = $doc->getElementsByTagName( 'body' )->item( 0 );
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if ( !( $container instanceof DOMElement ) ) {
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return $html;
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}
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$parser = static::getParser( $container );
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$threadItems = $parser->getThreadItems();
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foreach ( $threadItems as $threadItem ) {
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// TODO: Consider not attaching JSON data to the DOM.
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// Create a dummy node to attach data to.
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if ( $threadItem instanceof HeadingItem && $threadItem->isPlaceholderHeading() ) {
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$node = $doc->createElement( 'span' );
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$container->insertBefore( $node, $container->firstChild );
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$threadItem->setRange( new ImmutableRange( $node, 0, $node, 0 ) );
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}
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// And start and end markers to range
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$id = $threadItem->getId();
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$range = $threadItem->getRange();
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$startMarker = $doc->createElement( 'span' );
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$startMarker->setAttribute( 'data-mw-comment-start', '' );
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$startMarker->setAttribute( 'id', $id );
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$endMarker = $doc->createElement( 'span' );
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$endMarker->setAttribute( 'data-mw-comment-end', $id );
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// Extend the range if the start or end is inside an element which can't have element children.
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// (There may be other problematic elements... but this seems like a good start.)
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if ( CommentUtils::cantHaveElementChildren( $range->startContainer ) ) {
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$range = $range->setStart(
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$range->startContainer->parentNode,
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CommentUtils::childIndexOf( $range->startContainer )
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);
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}
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if ( CommentUtils::cantHaveElementChildren( $range->endContainer ) ) {
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$range = $range->setEnd(
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$range->endContainer->parentNode,
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CommentUtils::childIndexOf( $range->endContainer ) + 1
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);
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}
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$range->setStart( $range->endContainer, $range->endOffset )->insertNode( $endMarker );
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$range->insertNode( $startMarker );
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$itemData = $threadItem->jsonSerialize();
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$itemJSON = json_encode( $itemData );
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if ( $threadItem instanceof HeadingItem ) {
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$threadItem->getRange()->endContainer->setAttribute( 'data-mw-comment', $itemJSON );
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if ( !$threadItem->isPlaceholderHeading() && $threadItem->getHeadingLevel() === 2 ) {
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$headingNode = CommentUtils::closestElement( $threadItem->getRange()->endContainer, [ 'h2' ] );
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if ( $headingNode ) {
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$existingClass = $headingNode->getAttribute( 'class' );
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$headingNode->setAttribute(
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'class',
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( $existingClass ? $existingClass . ' ' : '' ) . 'ext-discussiontools-init-section'
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);
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// Replaced in ::postprocessTopicSubscription() as the icon depends on user state
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$subscribe = $doc->createComment( '__DTSUBSCRIBE__' . $threadItem->getName() );
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$headingNode->appendChild( $subscribe );
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}
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}
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} elseif ( $threadItem instanceof CommentItem ) {
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$replyLinkButtons = $doc->createElement( 'span' );
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$replyLinkButtons->setAttribute( 'class', 'ext-discussiontools-init-replylink-buttons' );
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// Reply
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$replyLink = $doc->createElement( 'a' );
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$replyLink->setAttribute( 'class', 'ext-discussiontools-init-replylink-reply' );
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$replyLink->setAttribute( 'role', 'button' );
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$replyLink->setAttribute( 'tabindex', '0' );
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$replyLink->setAttribute( 'data-mw-comment', $itemJSON );
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// Set empty 'href' to avoid a:not([href]) selector in MobileFrontend
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$replyLink->setAttribute( 'href', '' );
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// Replaced in ::postprocessReplyTool() as the label depends on user language
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$replyText = $doc->createComment( '__DTREPLY__' );
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$replyLink->appendChild( $replyText );
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$bracket = $doc->createElement( 'span' );
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$bracket->setAttribute( 'class', 'ext-discussiontools-init-replylink-bracket' );
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$bracketLeft = $bracket->cloneNode( false );
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$bracketLeft->nodeValue = '[';
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$bracketRight = $bracket->cloneNode( false );
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$bracketRight->nodeValue = ']';
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$replyLinkButtons->appendChild( $bracketLeft );
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$replyLinkButtons->appendChild( $replyLink );
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$replyLinkButtons->appendChild( $bracketRight );
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CommentModifier::addReplyLink( $threadItem, $replyLinkButtons );
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}
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}
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$docElement = $doc->getElementsByTagName( 'body' )->item( 0 );
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if ( !( $docElement instanceof DOMElement ) ) {
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return $html;
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}
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// Like DOMCompat::getInnerHTML(), but disable 'smartQuote' for compatibility with
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// ParserOutput::EDITSECTION_REGEX matching 'mw:editsection' tags (T274709)
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return XMLSerializer::serialize( $docElement, [ 'innerXML' => true, 'smartQuote' => false ] )['html'];
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}
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/**
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* Replace placeholders for topic subscription buttons with the real thing.
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*
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* @param string $text
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* @param Language $lang
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* @param SubscriptionStore $subscriptionStore
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* @param UserIdentity $user
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* @return string
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*/
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public static function postprocessTopicSubscription(
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string $text, Language $lang, SubscriptionStore $subscriptionStore, UserIdentity $user
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) : string {
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$doc = new DOMDocument();
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$matches = [];
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preg_match_all( '/<!--__DTSUBSCRIBE__(.*?)-->/', $text, $matches );
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$itemNames = $matches[1];
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$items = $subscriptionStore->getSubscriptionItemsForUser(
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$user,
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$itemNames
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);
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$itemsByName = [];
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foreach ( $items as $item ) {
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$itemsByName[ $item->getItemName() ] = $item;
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}
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$text = preg_replace_callback(
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'/<!--__DTSUBSCRIBE__(.*?)-->/',
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static function ( $matches ) use ( $doc, $itemsByName, $lang ) {
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$itemName = $matches[1];
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$isSubscribed = isset( $itemsByName[ $itemName ] ) && !$itemsByName[ $itemName ]->isMuted();
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$subscribe = $doc->createElement( 'span' );
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$subscribe->setAttribute(
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'class',
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'ext-discussiontools-init-section-subscribe mw-editsection-like'
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);
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$subscribeLink = $doc->createElement( 'a' );
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// Set empty 'href' to avoid a:not([href]) selector in MobileFrontend
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$subscribeLink->setAttribute( 'href', '' );
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$subscribeLink->setAttribute( 'class', 'ext-discussiontools-init-section-subscribe-link' );
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$subscribeLink->setAttribute( 'role', 'button' );
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$subscribeLink->setAttribute( 'tabindex', '0' );
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$subscribeLink->setAttribute( 'data-mw-comment-name', $itemName );
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$subscribeLink->setAttribute( 'title', wfMessage(
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$isSubscribed ?
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'discussiontools-topicsubscription-button-unsubscribe-tooltip' :
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'discussiontools-topicsubscription-button-subscribe-tooltip'
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)->inLanguage( $lang )->text() );
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$subscribeLink->nodeValue = wfMessage(
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$isSubscribed ?
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'discussiontools-topicsubscription-button-unsubscribe' :
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'discussiontools-topicsubscription-button-subscribe'
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)->inLanguage( $lang )->text();
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if ( $isSubscribed ) {
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$subscribeLink->setAttribute( 'data-mw-subscribed', '' );
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}
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$bracket = $doc->createElement( 'span' );
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$bracket->setAttribute( 'class', 'ext-discussiontools-init-section-subscribe-bracket' );
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$bracketLeft = $bracket->cloneNode( false );
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$bracketLeft->nodeValue = '[';
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$bracketRight = $bracket->cloneNode( false );
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$bracketRight->nodeValue = ']';
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$subscribe->appendChild( $bracketLeft );
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$subscribe->appendChild( $subscribeLink );
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$subscribe->appendChild( $bracketRight );
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return DOMCompat::getOuterHTML( $subscribe );
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},
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$text
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);
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return $text;
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}
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/**
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* Replace placeholders for reply links with the real thing.
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*
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* @param string $text
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* @param Language $lang
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* @return string
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*/
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public static function postprocessReplyTool(
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string $text, Language $lang
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) {
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$replyText = wfMessage( 'discussiontools-replylink' )->inLanguage( $lang )->escaped();
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$text = str_replace( '<!--__DTREPLY__-->', $replyText, $text );
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return $text;
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}
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}
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