mirror of
https://gerrit.wikimedia.org/r/mediawiki/extensions/Echo
synced 2024-11-24 16:04:35 +00:00
1235 lines
37 KiB
PHP
1235 lines
37 KiB
PHP
<?php
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use MediaWiki\MediaWikiServices;
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abstract class EchoDiscussionParser {
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const HEADER_REGEX = '^(==+)\s*([^=].*)\s*\1$';
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static protected $timestampRegex;
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static protected $revisionInterpretationCache = [];
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static protected $diffParser;
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/**
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* Given a Revision object, generates EchoEvent objects for
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* the discussion-related actions that occurred in that Revision.
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*
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* @param Revision $revision
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* @param bool $isRevert
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* @return null
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*/
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static function generateEventsForRevision( Revision $revision, $isRevert ) {
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global $wgEchoMentionsOnMultipleSectionEdits;
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global $wgEchoMentionOnChanges;
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// use slave database if there is a previous revision
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if ( $revision->getPrevious() ) {
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$title = Title::newFromID( $revision->getPage() );
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// use master database for new page
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} else {
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$title = Title::newFromID( $revision->getPage(), Title::GAID_FOR_UPDATE );
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}
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// not a valid title
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if ( !$title ) {
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return;
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}
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$interpretation = self::getChangeInterpretationForRevision( $revision );
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$userID = $revision->getUser();
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$userName = $revision->getUserText();
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$user = $userID != 0 ? User::newFromId( $userID ) : User::newFromName( $userName, false );
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foreach ( $interpretation as $action ) {
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if ( $action['type'] == 'add-comment' ) {
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$fullSection = $action['full-section'];
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$header = self::extractHeader( $fullSection );
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$userLinks = self::getUserLinks( $action['content'], $title );
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self::generateMentionEvents( $header, $userLinks, $action['content'], $revision, $user );
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} elseif ( $action['type'] == 'new-section-with-comment' ) {
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$content = $action['content'];
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$header = self::extractHeader( $content );
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$userLinks = self::getUserLinks( $content, $title );
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self::generateMentionEvents( $header, $userLinks, $content, $revision, $user );
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} elseif ( $action['type'] == 'add-section-multiple' && $wgEchoMentionsOnMultipleSectionEdits ) {
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$content = self::stripHeader( $action['content'] );
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$content = self::stripSignature( $content );
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$userLinks = self::getUserLinks( $content, $title );
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self::generateMentionEvents( $action['header'], $userLinks, $content, $revision, $user );
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} elseif ( $action['type'] === 'unknown-signed-change' ) {
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$userLinks = array_diff_key(
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self::getUserLinks( $action['new_content'], $title ) ?: [],
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self::getUserLinks( $action['old_content'], $title ) ?: []
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);
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$header = self::extractHeader( $action['full-section'] );
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if ( $wgEchoMentionOnChanges ) {
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self::generateMentionEvents( $header, $userLinks, $action['new_content'], $revision, $user );
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}
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}
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}
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if ( $title->getNamespace() == NS_USER_TALK ) {
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$notifyUser = User::newFromName( $title->getText() );
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// If the recipient is a valid non-anonymous user and hasn't turned
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// off their notifications, generate a talk page post Echo notification.
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if ( $notifyUser && $notifyUser->getId() ) {
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// If this is a minor edit, only notify if the agent doesn't have talk page minor
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// edit notification blocked
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if ( !$revision->isMinor() || !$user->isAllowed( 'nominornewtalk' ) ) {
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$section = self::detectSectionTitleAndText( $interpretation, $title );
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if ( $section['section-text'] === '' ) {
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$section['section-text'] = $revision->getComment();
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}
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EchoEvent::create( [
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'type' => 'edit-user-talk',
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'title' => $title,
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'extra' => [
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'revid' => $revision->getId(),
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'minoredit' => $revision->isMinor(),
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'section-title' => $section['section-title'],
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'section-text' => $section['section-text'],
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'target-page' => $title->getArticleID(),
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],
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'agent' => $user,
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] );
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}
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}
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}
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// Notify users mentioned in edit summary
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global $wgEchoMaxMentionsInEditSummary;
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if ( $wgEchoMaxMentionsInEditSummary > 0 && !$user->isBot() && !$isRevert ) {
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$summaryParser = new EchoSummaryParser();
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$usersInSummary = $summaryParser->parse( $revision->getComment() );
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// Don't allow pinging yourself
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unset( $usersInSummary[$userName] );
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$count = 0;
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$mentionedUsers = [];
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foreach ( $usersInSummary as $summaryUser ) {
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if ( $summaryUser->getTalkPage()->equals( $title ) ) {
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// Users already get a ping when their talk page is edited
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continue;
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}
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if ( $count >= $wgEchoMaxMentionsInEditSummary ) {
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break;
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}
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$mentionedUsers[] = $summaryUser;
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$count++;
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}
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if ( $mentionedUsers ) {
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$info = [
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'type' => 'mention-summary',
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'title' => $title,
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'extra' => [
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'revid' => $revision->getId(),
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'mentioned-users' => $mentionedUsers,
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],
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'agent' => $user,
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];
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EchoEvent::create( $info );
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}
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}
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}
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/**
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* Attempts to determine what section title the edit was performed under (if any)
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*
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* @param array[] $interpretation Results of {@see getChangeInterpretationForRevision}
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* @param Title|null $title
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* @return string[] Array containing section title and text
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*/
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public static function detectSectionTitleAndText( array $interpretation, Title $title = null ) {
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$header = $snippet = '';
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$found = false;
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foreach ( $interpretation as $action ) {
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switch ( $action['type'] ) {
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case 'add-comment':
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$header = self::extractHeader( $action['full-section'] );
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$snippet = self::getTextSnippet(
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self::stripSignature( self::stripHeader( $action['content'] ), $title ),
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RequestContext::getMain()->getLanguage(),
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150,
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$title );
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break;
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case 'new-section-with-comment':
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$header = self::extractHeader( $action['content'] );
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$snippet = self::getTextSnippet(
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self::stripSignature( self::stripHeader( $action['content'] ), $title ),
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RequestContext::getMain()->getLanguage(),
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150,
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$title );
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break;
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}
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if ( $header ) {
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// If we find a second header within the same change interpretation then
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// we cannot choose just 1 to link to
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if ( $found ) {
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$found = false;
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break;
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}
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$found = true;
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}
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}
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if ( $found === false ) {
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return [ 'section-title' => '', 'section-text' => '' ];
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}
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return [ 'section-title' => $header, 'section-text' => $snippet ];
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}
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/**
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* For an action taken on a talk page, notify users whose user pages
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* are linked.
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* @param string $header The subject line for the discussion.
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* @param int[] $userLinks
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* @param string $content The content of the post, as a wikitext string.
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* @param Revision $revision
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* @param User $agent The user who made the comment.
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*/
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public static function generateMentionEvents(
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$header,
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$userLinks,
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$content,
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Revision $revision,
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User $agent
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) {
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global $wgEchoMaxMentionsCount, $wgEchoMentionStatusNotifications;
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$title = $revision->getTitle();
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if ( !$title ) {
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return;
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}
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$content = self::stripHeader( $content );
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$content = self::stripSignature( $content, $title );
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if ( !$userLinks ) {
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return;
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}
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$userMentions = self::getUserMentions( $title, $revision->getUser( Revision::RAW ), $userLinks );
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$overallMentionsCount = self::getOverallUserMentionsCount( $userMentions );
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if ( $overallMentionsCount === 0 ) {
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return;
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}
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$stats = MediaWikiServices::getInstance()->getStatsdDataFactory();
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if ( $overallMentionsCount > $wgEchoMaxMentionsCount ) {
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if ( $wgEchoMentionStatusNotifications ) {
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EchoEvent::create( [
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'type' => 'mention-failure-too-many',
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'title' => $title,
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'extra' => [
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'max-mentions' => $wgEchoMaxMentionsCount,
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'section-title' => $header,
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'notifyAgent' => true
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],
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'agent' => $agent,
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] );
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$stats->increment( 'echo.event.mention.notification.failure-too-many' );
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}
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return;
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}
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if ( $userMentions['validMentions'] ) {
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EchoEvent::create( [
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'type' => 'mention',
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'title' => $title,
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'extra' => [
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'content' => $content,
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'section-title' => $header,
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'revid' => $revision->getId(),
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'mentioned-users' => $userMentions['validMentions'],
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],
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'agent' => $agent,
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] );
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}
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if ( $wgEchoMentionStatusNotifications ) {
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// TODO batch?
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foreach ( $userMentions['validMentions'] as $mentionedUserId ) {
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EchoEvent::create( [
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'type' => 'mention-success',
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'title' => $title,
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'extra' => [
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'subject-name' => User::newFromId( $mentionedUserId )->getName(),
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'section-title' => $header,
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'revid' => $revision->getId(),
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'notifyAgent' => true
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],
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'agent' => $agent,
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] );
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$stats->increment( 'echo.event.mention.notification.success' );
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}
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// TODO batch?
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foreach ( $userMentions['anonymousUsers'] as $anonymousUser ) {
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EchoEvent::create( [
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'type' => 'mention-failure',
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'title' => $title,
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'extra' => [
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'failure-type' => 'user-anonymous',
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'subject-name' => $anonymousUser,
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'section-title' => $header,
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'revid' => $revision->getId(),
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'notifyAgent' => true
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],
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'agent' => $agent,
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] );
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$stats->increment( 'echo.event.mention.notification.failure-user-anonymous' );
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}
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// TODO batch?
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foreach ( $userMentions['unknownUsers'] as $unknownUser ) {
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EchoEvent::create( [
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'type' => 'mention-failure',
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'title' => $title,
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'extra' => [
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'failure-type' => 'user-unknown',
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'subject-name' => $unknownUser,
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'section-title' => $header,
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'revid' => $revision->getId(),
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'notifyAgent' => true
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],
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'agent' => $agent,
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] );
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$stats->increment( 'echo.event.mention.notification.failure-user-unknown' );
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}
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}
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}
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private static function getOverallUserMentionsCount( $userMentions ) {
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return count( $userMentions, COUNT_RECURSIVE ) - count( $userMentions );
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}
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/**
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* @param Title $title
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* @param int $revisionUserId
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* @param int[] $userLinks
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* @return array[]
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* Set of arrays containing valid mentions and possible intended but failed mentions.
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* - [validMentions]: An array of valid users to mention with ID => ID.
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* - [unknownUsers]: An array of DBKey strings representing unknown users.
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* - [anonymousUsers]: An array of DBKey strings representing anonymous IP users.
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*/
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private static function getUserMentions( Title $title, $revisionUserId, array $userLinks ) {
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global $wgEchoMaxMentionsCount;
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$userMentions = [
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'validMentions' => [],
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'unknownUsers' => [],
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'anonymousUsers' => [],
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];
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$count = 0;
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$stats = MediaWikiServices::getInstance()->getStatsdDataFactory();
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foreach ( $userLinks as $dbk => $page_id ) {
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// If more users are being pinged this is likely a spam/attack vector
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// Don't send any mention notifications.
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if ( $count > $wgEchoMaxMentionsCount ) {
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$stats->increment( 'echo.event.mention.error.tooMany' );
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break;
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}
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// we should not add user to 'mention' notification list if
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// 1. the user link links to a subpage
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if ( self::hasSubpage( $dbk ) ) {
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continue;
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}
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// 2. user is an anonymous IP
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if ( User::isIP( $dbk ) ) {
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$userMentions['anonymousUsers'][] = $dbk;
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$count++;
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$stats->increment( 'echo.event.mention.error.anonUser' );
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continue;
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}
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$user = User::newFromName( $dbk );
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// 3. the user name is not valid
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if ( !$user ) {
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$userMentions['unknownUsers'][] = str_replace( '_', ' ', $dbk );
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$count++;
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$stats->increment( 'echo.event.mention.error.invalidUser' );
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continue;
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}
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// 4. the user mentions themselves
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if ( $user->getId() === $revisionUserId ) {
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$stats->increment( 'echo.event.mention.error.sameUser' );
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continue;
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}
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// 5. the user is the owner of the talk page
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if ( $title->getNamespace() === NS_USER_TALK && $title->getDBkey() === $dbk ) {
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$stats->increment( 'echo.event.mention.error.ownPage' );
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continue;
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}
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// 6. user does not exist
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if ( $user->getId() === 0 ) {
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$userMentions['unknownUsers'][] = str_replace( '_', ' ', $dbk );
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$count++;
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$stats->increment( 'echo.event.mention.error.unknownUser' );
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continue;
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}
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$userMentions['validMentions'][$user->getId()] = $user->getId();
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$count++;
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}
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return $userMentions;
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}
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/**
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* @param string $content
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* @param Title $title
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* @return int[]|false
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* Array of links in the user namespace with DBKey => ID.
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*/
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private static function getUserLinks( $content, Title $title ) {
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$output = self::parseNonEditWikitext( $content, new Article( $title ) );
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$links = $output->getLinks();
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if ( !isset( $links[NS_USER] ) || !is_array( $links[NS_USER] ) ) {
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return false;
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}
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return $links[NS_USER];
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}
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private static function hasSubpage( $dbk ) {
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return strpos( $dbk, '/' ) !== false;
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}
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/**
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* It's like Article::prepareTextForEdit,
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* but not for editing (old wikitext usually)
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* Stolen from AbuseFilterVariableHolder
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*
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* @param string $wikitext
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* @param Article $article
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*
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* @return ParserOutput
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*/
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static function parseNonEditWikitext( $wikitext, Article $article ) {
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static $cache = [];
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$cacheKey = md5( $wikitext ) . ':' . $article->getTitle()->getPrefixedText();
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if ( isset( $cache[$cacheKey] ) ) {
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return $cache[$cacheKey];
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}
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global $wgParser;
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$options = new ParserOptions;
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$options->setTidy( true );
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$output = $wgParser->parse( $wikitext, $article->getTitle(), $options );
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$cache[$cacheKey] = $output;
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return $output;
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}
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/**
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* Given a Revision object, returns a talk-page-centric interpretation
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* of the changes made in it.
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*
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* @param Revision $revision
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* @see EchoDiscussionParser::interpretDiff
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* @return array[] See {@see interpretDiff} for details.
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*/
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static function getChangeInterpretationForRevision( Revision $revision ) {
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if ( $revision->getId() && isset( self::$revisionInterpretationCache[$revision->getId()] ) ) {
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return self::$revisionInterpretationCache[$revision->getId()];
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}
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$userID = $revision->getUser();
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$userName = $revision->getUserText();
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$user = $userID != 0 ? User::newFromId( $userID ) : User::newFromName( $userName, false );
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$prevText = '';
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if ( $revision->getParentId() ) {
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$prevRevision = Revision::newFromId( $revision->getParentId() );
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if ( $prevRevision ) {
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$prevText = ContentHandler::getContentText( $prevRevision->getContent() );
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}
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}
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$changes = self::getMachineReadableDiff(
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$prevText,
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ContentHandler::getContentText( $revision->getContent() )
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);
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$output = self::interpretDiff( $changes, $user->getName(), $revision->getTitle() );
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self::$revisionInterpretationCache[$revision->getId()] = $output;
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return $output;
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}
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/**
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* Given a machine-readable diff, interprets the changes
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* in terms of discussion page actions
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*
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* @todo Expand recognisable actions.
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*
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* @param array $changes Output of EchoEvent::getMachineReadableDiff
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* @param string $username
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* @param Title|null $title
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* @return array[] Array of associative arrays.
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*
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* Each entry represents an action, which is classified in the 'action' field.
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* All types contain a 'content' field except 'unknown'
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* (which instead passes through the machine-readable diff in 'details')
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* and 'unknown-change' (which provides 'new_content' and 'old_content')
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* action may be:
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* - add-comment: A comment signed by the user is added to an
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* existing section.
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* - new-section-with-comment: A new section is added, containing
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* a single comment signed by the user in question.
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* - add-section-multiple: A new section or additions to a section
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* while editing multiple sections at once.
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* - unknown-multi-signed-addition: Some signed content is added,
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* but it contains multiple signatures.
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* - unknown-unsigned-addition: Some content is added, but it is
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* unsigned.
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* - unknown-subtraction: Some content was removed. These actions are
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* not currently analysed.
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* - unknown-change: Some content was replaced with other content.
|
|
* - unknown-signed-change: Same as unknown-change, but signed.
|
|
* - unknown-multi-signed-change: Same as unknown-change,
|
|
* but it contains multiple signatures.
|
|
* - unknown: Unrecognised change type.
|
|
*/
|
|
static function interpretDiff( $changes, $username, Title $title = null ) {
|
|
// One extra item in $changes for _info
|
|
$actions = [];
|
|
$signedSections = [];
|
|
|
|
foreach ( $changes as $index => $change ) {
|
|
if ( !is_numeric( $index ) ) {
|
|
continue;
|
|
}
|
|
|
|
if ( !$change['action'] ) {
|
|
// Unknown action; skip
|
|
continue;
|
|
}
|
|
|
|
if ( $change['action'] == 'add' ) {
|
|
$content = trim( $change['content'] );
|
|
// The \A means the regex must match at the beginning of the string.
|
|
// This is slightly different than ^ which matches beginning of each
|
|
// line in multiline mode.
|
|
$startSection = preg_match( "/\A" . self::HEADER_REGEX . '/um', $content );
|
|
$sectionCount = self::getSectionCount( $content );
|
|
$signedUsers = array_keys( self::extractSignatures( $content, $title ) );
|
|
|
|
if (
|
|
count( $signedUsers ) == 1 &&
|
|
in_array( $username, $signedUsers )
|
|
) {
|
|
if ( $sectionCount === 0 ) {
|
|
$signedSections[] = self::getSectionSpan( $change['right-pos'], $changes['_info']['rhs'] );
|
|
$fullSection = self::getFullSection( $changes['_info']['rhs'], $change['right-pos'] );
|
|
$actions[] = [
|
|
'type' => 'add-comment',
|
|
'content' => $content,
|
|
'full-section' => $fullSection,
|
|
];
|
|
} elseif ( $startSection && $sectionCount === 1 ) {
|
|
$signedSections[] = self::getSectionSpan( $change['right-pos'], $changes['_info']['rhs'] );
|
|
$actions[] = [
|
|
'type' => 'new-section-with-comment',
|
|
'content' => $content,
|
|
];
|
|
} else {
|
|
$nextSectionStart = $change['right-pos'];
|
|
$sectionData = self::extractSections( $content );
|
|
foreach ( $sectionData as $section ) {
|
|
$sectionSpan = self::getSectionSpan( $nextSectionStart, $changes['_info']['rhs'] );
|
|
$nextSectionStart = $sectionSpan[1] + 1;
|
|
$sectionSignedUsers = self::extractSignatures( $section['content'], $title );
|
|
if ( !empty( $sectionSignedUsers ) ) {
|
|
$signedSections[] = $sectionSpan;
|
|
if ( !$section['header'] ) {
|
|
$fullSection = self::getFullSection( $changes['_info']['rhs'], $change['right-pos'] );
|
|
$section['header'] = self::extractHeader( $fullSection );
|
|
}
|
|
$actions[] = [
|
|
'type' => 'add-section-multiple',
|
|
'content' => $section['content'],
|
|
'header' => $section['header'],
|
|
];
|
|
} else {
|
|
$actions[] = [
|
|
'type' => 'unknown-unsigned-addition',
|
|
'content' => $section['content'],
|
|
];
|
|
}
|
|
}
|
|
}
|
|
} elseif ( $signedUsers !== [] ) {
|
|
$actions[] = [
|
|
'type' => 'unknown-multi-signed-addition',
|
|
'content' => $content,
|
|
];
|
|
} else {
|
|
$actions[] = [
|
|
'type' => 'unknown-unsigned-addition',
|
|
'content' => $content,
|
|
];
|
|
}
|
|
} elseif ( $change['action'] == 'subtract' ) {
|
|
$actions[] = [
|
|
'type' => 'unknown-subtraction',
|
|
'content' => $change['content'],
|
|
];
|
|
} elseif ( $change['action'] == 'change' ) {
|
|
$actions[] = [
|
|
'type' => 'unknown-change',
|
|
'old_content' => $change['old_content'],
|
|
'new_content' => $change['new_content'],
|
|
'right-pos' => $change['right-pos'],
|
|
'full-section' => self::getFullSection( $changes['_info']['rhs'], $change['right-pos'] ),
|
|
];
|
|
|
|
if ( self::hasNewSignature(
|
|
$change['old_content'],
|
|
$change['new_content'],
|
|
$username,
|
|
$title
|
|
) ) {
|
|
$signedSections[] = self::getSectionSpan( $change['right-pos'], $changes['_info']['rhs'] );
|
|
}
|
|
} else {
|
|
$actions[] = [
|
|
'type' => 'unknown',
|
|
'details' => $change,
|
|
];
|
|
}
|
|
}
|
|
|
|
if ( !empty( $signedSections ) ) {
|
|
$actions = self::convertToUnknownSignedChanges( $signedSections, $actions );
|
|
}
|
|
|
|
return $actions;
|
|
}
|
|
|
|
static function getSignedUsers( $content, $title ) {
|
|
return array_keys( self::extractSignatures( $content, $title ) );
|
|
}
|
|
|
|
static function hasNewSignature( $oldContent, $newContent, $username, $title ) {
|
|
$oldSignedUsers = self::getSignedUsers( $oldContent, $title );
|
|
$newSignedUsers = self::getSignedUsers( $newContent, $title );
|
|
|
|
return !in_array( $username, $oldSignedUsers ) && in_array( $username, $newSignedUsers );
|
|
}
|
|
|
|
/**
|
|
* Converts actions of type "unknown-change" to "unknown-signed-change" if the change is in a signed section.
|
|
*
|
|
* @param array[] $signedSections Array of arrays containing first and last line number of signed sections
|
|
* @param array[] $actions
|
|
* @return array[] Converted actions
|
|
*/
|
|
static function convertToUnknownSignedChanges( array $signedSections, array $actions ) {
|
|
return array_map( function ( $action ) use( $signedSections ) {
|
|
if (
|
|
$action['type'] === 'unknown-change' &&
|
|
self::isInSignedSection( $action['right-pos'], $signedSections )
|
|
) {
|
|
$signedUsers = self::getSignedUsers( $action['new_content'], null );
|
|
if ( count( $signedUsers ) === 1 ) {
|
|
$action['type'] = 'unknown-signed-change';
|
|
} else {
|
|
$action['type'] = 'unknown-multi-signed-change';
|
|
}
|
|
}
|
|
|
|
return $action;
|
|
}, $actions );
|
|
}
|
|
|
|
static function isInSignedSection( $line, array $signedSections ) {
|
|
foreach ( $signedSections as $section ) {
|
|
if ( $line > $section[0] && $line <= $section[1] ) {
|
|
return true;
|
|
}
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* Finds the section that a given line is in.
|
|
*
|
|
* @param array $lines of lines in the page.
|
|
* @param int $offset The line to find the full section for.
|
|
* @return string Content of the section.
|
|
*/
|
|
static function getFullSection( array $lines, $offset ) {
|
|
$start = self::getSectionStartIndex( $offset, $lines );
|
|
$end = self::getSectionEndIndex( $offset, $lines );
|
|
$content = implode( "\n", array_slice( $lines, $start, $end - $start ) );
|
|
|
|
return trim( $content, "\n" );
|
|
}
|
|
|
|
/**
|
|
* Given a line number and a text, find the first and last line of the section the line number is in.
|
|
* If there are subsections, the last line index will be the line before the beginning of the first subsection.
|
|
* @param int $offset line number
|
|
* @param string[] $lines
|
|
* @return int[] Tuple [$firstLine, $lastLine]
|
|
*/
|
|
static function getSectionSpan( $offset, $lines ) {
|
|
return [
|
|
self::getSectionStartIndex( $offset, $lines ),
|
|
self::getSectionEndIndex( $offset, $lines )
|
|
];
|
|
}
|
|
|
|
/**
|
|
* Finds the line number of the start of the section that $offset is in.
|
|
* @param int $offset
|
|
* @param string[] $lines
|
|
* @return int
|
|
*/
|
|
static function getSectionStartIndex( $offset, array $lines ) {
|
|
for ( $i = $offset - 1; $i >= 0; $i-- ) {
|
|
if ( self::getSectionCount( $lines[$i] ) ) {
|
|
break;
|
|
}
|
|
}
|
|
|
|
return $i;
|
|
}
|
|
|
|
/**
|
|
* Finds the line number of the end of the section that $offset is in.
|
|
* @param int $offset
|
|
* @param array $lines
|
|
* @return int
|
|
*/
|
|
static function getSectionEndIndex( $offset, array $lines ) {
|
|
$lastLine = count( $lines );
|
|
for ( $i = $offset; $i < $lastLine; $i++ ) {
|
|
if ( self::getSectionCount( $lines[$i] ) ) {
|
|
break;
|
|
}
|
|
}
|
|
|
|
return $i;
|
|
}
|
|
|
|
/**
|
|
* Gets the number of section headers in a string.
|
|
*
|
|
* @param string $text The text.
|
|
* @return int Number of section headers found.
|
|
*/
|
|
static function getSectionCount( $text ) {
|
|
$text = trim( $text );
|
|
|
|
$matches = [];
|
|
preg_match_all( '/' . self::HEADER_REGEX . '/um', $text, $matches );
|
|
|
|
return count( $matches[0] );
|
|
}
|
|
|
|
/**
|
|
* Gets the title of a section or sub section
|
|
*
|
|
* @param string $text The text of the section.
|
|
* @return string|false The title of the section or false if not found
|
|
*/
|
|
static function extractHeader( $text ) {
|
|
$text = trim( $text );
|
|
|
|
$matches = [];
|
|
|
|
if ( !preg_match_all( '/' . self::HEADER_REGEX . '/um', $text, $matches ) ) {
|
|
return false;
|
|
}
|
|
|
|
return trim( end( $matches[2] ) );
|
|
}
|
|
|
|
/**
|
|
* Extracts sections and their contents from text.
|
|
*
|
|
* @param string $text The text to parse.
|
|
* @return array[]
|
|
* Array of arrays containing sections with header and content.
|
|
* - [header]: The full header string of the section or false if there is preceding text without header.
|
|
* - [content]: The content of the section including the header string.
|
|
*/
|
|
private static function extractSections( $text ) {
|
|
$matches = [];
|
|
|
|
if ( !preg_match_all( '/' . self::HEADER_REGEX . '/um', $text, $matches, PREG_OFFSET_CAPTURE ) ) {
|
|
return [ [
|
|
'header' => false,
|
|
'content' => $text
|
|
] ];
|
|
}
|
|
|
|
$sectionNum = count( $matches[0] );
|
|
$sections = [];
|
|
|
|
if ( $matches[0][0][1] > 1 ) { // is there text before the first headline?
|
|
$sections[] = [
|
|
'header' => false,
|
|
'content' => substr( $text, 0, $matches[0][0][1] - 1 )
|
|
];
|
|
}
|
|
for ( $i = 0; $i < $sectionNum; $i++ ) {
|
|
if ( $i + 1 < $sectionNum ) {
|
|
$content = substr( $text, $matches[0][$i][1], $matches[0][$i + 1][1] - $matches[0][$i][1] );
|
|
} else {
|
|
$content = substr( $text, $matches[0][$i][1] );
|
|
}
|
|
$sections[] = [
|
|
'header' => self::extractHeader( $matches[0][$i][0] ),
|
|
'content' => trim( $content )
|
|
];
|
|
}
|
|
|
|
return $sections;
|
|
}
|
|
|
|
/**
|
|
* Strips out a signature if possible.
|
|
*
|
|
* @param string $text The wikitext to strip
|
|
* @param Title|null $title
|
|
* @return string
|
|
*/
|
|
static function stripSignature( $text, Title $title = null ) {
|
|
$output = self::getUserFromLine( $text, $title );
|
|
if ( $output === false ) {
|
|
$timestampPos = self::getTimestampPosition( $text );
|
|
|
|
return substr( $text, 0, $timestampPos );
|
|
}
|
|
|
|
// Use truncateForDatabase() instead of truncateHTML() because
|
|
// truncateHTML() would not strip signature if the text contains
|
|
// < or &. (And we can't use truncateForVisual() because
|
|
// self::getUserFromLine() returns byte offsets, not character
|
|
// offsets.)
|
|
return MediaWikiServices::getInstance()->getContentLanguage()
|
|
->truncateForDatabase( $text, $output[0], '' );
|
|
}
|
|
|
|
/**
|
|
* Strips out a section header
|
|
* @param string $text The text to strip out the section header from.
|
|
* @return string The same text, with the section header stripped out.
|
|
*/
|
|
static function stripHeader( $text ) {
|
|
$text = preg_replace( '/' . self::HEADER_REGEX . '/um', '', $text );
|
|
|
|
return $text;
|
|
}
|
|
|
|
/**
|
|
* Determines whether the input is a signed comment.
|
|
*
|
|
* @param string $text The text to check.
|
|
* @param User|bool $user If set, will only return true if the comment is
|
|
* signed by this user.
|
|
* @param Title|null $title
|
|
* @return bool
|
|
*/
|
|
static function isSignedComment( $text, $user = false, Title $title = null ) {
|
|
$userData = self::getUserFromLine( $text, $title );
|
|
|
|
if ( $userData === false ) {
|
|
return false;
|
|
} elseif ( $user === false ) {
|
|
return true;
|
|
}
|
|
|
|
list( , $foundUser ) = $userData;
|
|
|
|
return User::getCanonicalName( $foundUser, false ) === User::getCanonicalName( $user, false );
|
|
}
|
|
|
|
/**
|
|
* Finds the start position, if any, of the timestamp on a line
|
|
*
|
|
* @param string $line The line to search for a signature on
|
|
* @return int|false Integer position
|
|
*/
|
|
static function getTimestampPosition( $line ) {
|
|
$timestampRegex = self::getTimestampRegex();
|
|
$endOfLine = self::getLineEndingRegex();
|
|
$tsMatches = [];
|
|
if ( !preg_match(
|
|
"/$timestampRegex$endOfLine/mu",
|
|
$line,
|
|
$tsMatches,
|
|
PREG_OFFSET_CAPTURE
|
|
) ) {
|
|
return false;
|
|
}
|
|
|
|
return $tsMatches[0][1];
|
|
}
|
|
|
|
/**
|
|
* Finds differences between $oldText and $newText
|
|
* and returns the result in a machine-readable format.
|
|
*
|
|
* @param string $oldText The "left hand side" of the diff.
|
|
* @param string $newText The "right hand side" of the diff.
|
|
* @throws MWException
|
|
* @return array[] Array of changes.
|
|
* Each change consists of:
|
|
* * An 'action', one of:
|
|
* - add
|
|
* - subtract
|
|
* - change
|
|
* * 'content' that was added or removed, or in the case
|
|
* of a change, 'old_content' and 'new_content'
|
|
* * 'left_pos' and 'right_pos' (in lines) of the change.
|
|
*/
|
|
static function getMachineReadableDiff( $oldText, $newText ) {
|
|
if ( !isset( self::$diffParser ) ) {
|
|
self::$diffParser = new EchoDiffParser;
|
|
}
|
|
|
|
return self::$diffParser->getChangeSet( $oldText, $newText );
|
|
}
|
|
|
|
/**
|
|
* Finds and extracts signatures in $text
|
|
*
|
|
* @param string $text The text in which to look for signed comments.
|
|
* @param Title|null $title
|
|
* @return string[] Associative array, the key is the username, the value
|
|
* is the last signature that was found.
|
|
*/
|
|
static function extractSignatures( $text, Title $title = null ) {
|
|
$lines = explode( "\n", $text );
|
|
|
|
$output = [];
|
|
|
|
$lineNumber = 0;
|
|
|
|
foreach ( $lines as $line ) {
|
|
++$lineNumber;
|
|
|
|
// Look for the last user link on the line.
|
|
$userData = self::getUserFromLine( $line, $title );
|
|
if ( $userData === false ) {
|
|
// print "F\t$lineNumber\t$line\n";
|
|
continue;
|
|
} else {
|
|
// print "S\t$lineNumber\n";
|
|
}
|
|
|
|
list( $signaturePos, $user ) = $userData;
|
|
|
|
$signature = substr( $line, $signaturePos );
|
|
$output[$user] = $signature;
|
|
}
|
|
|
|
return $output;
|
|
}
|
|
|
|
/**
|
|
* From a line in the signature, extract all the users linked to
|
|
*
|
|
* @param string $line Line of text potentially including linked user, user talk,
|
|
* and contribution pages
|
|
* @return string[] array of usernames, empty array for none detected
|
|
*/
|
|
public static function extractUsersFromLine( $line ) {
|
|
/*
|
|
* Signatures can look like anything (as defined by i18n messages
|
|
* "signature" & "signature-anon").
|
|
* A signature can, e.g., be both a link to user & user-talk page.
|
|
*/
|
|
// match all title-like excerpts in this line
|
|
if ( !preg_match_all( '/\[\[([^\[]+)\]\]/', $line, $matches ) ) {
|
|
return [];
|
|
}
|
|
|
|
$matches = $matches[1];
|
|
|
|
$usernames = [];
|
|
|
|
foreach ( $matches as $match ) {
|
|
/*
|
|
* Create an object out of the link title.
|
|
* In theory, links can be [[text]], [[text|text]] or pipe tricks
|
|
* [[text|]] or [[|text]].
|
|
* In the case of reverse pipe trick, the value we use *could* be
|
|
* empty, but Parser::pstPass2 should have normalized that for us
|
|
* already.
|
|
*/
|
|
$match = explode( '|', $match );
|
|
$title = Title::newFromText( $match[0] );
|
|
|
|
// figure out if we the link is related to a user
|
|
if (
|
|
$title &&
|
|
( $title->getNamespace() === NS_USER || $title->getNamespace() === NS_USER_TALK )
|
|
) {
|
|
$usernames[] = $title->getText();
|
|
} elseif ( $title && $title->isSpecial( 'Contributions' ) ) {
|
|
$parts = explode( '/', $title->getText(), 2 );
|
|
$usernames[] = end( $parts );
|
|
} else {
|
|
// move on to next matched title-like excerpt
|
|
continue;
|
|
}
|
|
}
|
|
|
|
return $usernames;
|
|
}
|
|
|
|
/**
|
|
* From a line in a wiki page, determine which user, if any,
|
|
* has signed it.
|
|
*
|
|
* @param string $line The line.
|
|
* @param Title|null $title
|
|
* @return array|false False for none, array for success.
|
|
* - First element is the position of the signature.
|
|
* - Second element is the normalised user name.
|
|
*/
|
|
public static function getUserFromLine( $line, Title $title = null ) {
|
|
global $wgParser;
|
|
|
|
/*
|
|
* First we call extractUsersFromLine to get all the potential usernames
|
|
* from the line. Then, we loop backwards through them, figure out which
|
|
* match to a user, regenera the signature based on that user, and
|
|
* see if it matches!
|
|
*/
|
|
$usernames = self::extractUsersFromLine( $line );
|
|
$usernames = array_reverse( $usernames );
|
|
foreach ( $usernames as $username ) {
|
|
// generate (dateless) signature from the user we think we've
|
|
// discovered the signature from
|
|
// don't validate the username - anon (IP) is fine!
|
|
$user = User::newFromName( $username, false );
|
|
$sig = $wgParser->preSaveTransform(
|
|
'~~~',
|
|
$title ?: Title::newMainPage(),
|
|
$user,
|
|
new ParserOptions()
|
|
);
|
|
|
|
// see if we can find this user's generated signature in the content
|
|
$pos = strrpos( $line, $sig );
|
|
if ( $pos !== false ) {
|
|
return [ $pos, $username ];
|
|
}
|
|
// couldn't find sig, move on to next link excerpt and try there
|
|
}
|
|
|
|
// couldn't find any matching signature
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* Find the last link beginning with a given prefix on a line.
|
|
*
|
|
* @param string $line The line to search.
|
|
* @param string $linkPrefix The prefix to search for.
|
|
* @param bool $failureOffset
|
|
* @return array|false False for failure, array for success.
|
|
* - First element is the string offset of the link.
|
|
* - Second element is the user the link refers to.
|
|
*/
|
|
static function getLinkFromLine( $line, $linkPrefix, $failureOffset = false ) {
|
|
$offset = 0;
|
|
|
|
// If extraction failed at another offset, try again.
|
|
if ( $failureOffset !== false ) {
|
|
$offset = $failureOffset - strlen( $line ) - 1;
|
|
}
|
|
|
|
// Avoid PHP warning: Offset is greater than the length of haystack string
|
|
if ( abs( $offset ) > strlen( $line ) ) {
|
|
return false;
|
|
}
|
|
|
|
$linkPos = strripos( $line, $linkPrefix, $offset );
|
|
|
|
if ( $linkPos === false ) {
|
|
// print "I\tNo match for $linkPrefix\n";
|
|
return false;
|
|
}
|
|
|
|
$linkUser = self::extractUserFromLink( $line, $linkPrefix, $linkPos );
|
|
|
|
if ( $linkUser === false ) {
|
|
// print "E\tExtraction failed\t$linkPrefix\n";
|
|
// Look for another place.
|
|
return self::getLinkFromLine( $line, $linkPrefix, $linkPos );
|
|
} else {
|
|
return [ $linkPos, $linkUser ];
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Given text including a link, gives the user that that link refers to
|
|
*
|
|
* @param string $text The text to extract from.
|
|
* @param string $prefix The link prefix that was used to find the link.
|
|
* @param int $offset Optionally, the offset of the start of the link.
|
|
* @return bool|string Type description
|
|
*/
|
|
static function extractUserFromLink( $text, $prefix, $offset = 0 ) {
|
|
$userPart = substr( $text, strlen( $prefix ) + $offset );
|
|
|
|
$userMatches = [];
|
|
if ( !preg_match(
|
|
'/^[^\|\]\#]+/u',
|
|
$userPart,
|
|
$userMatches
|
|
) ) {
|
|
// user link is invalid
|
|
// print "I\tUser link invalid\t$userPart\n";
|
|
// print "E\tCannot find user info to extract\n";
|
|
return false;
|
|
}
|
|
|
|
$user = $userMatches[0];
|
|
|
|
if (
|
|
!User::isIP( $user ) &&
|
|
User::getCanonicalName( $user ) === false
|
|
) {
|
|
// Not a real username
|
|
// print "E\tInvalid username\n";
|
|
return false;
|
|
}
|
|
|
|
return User::getCanonicalName( $userMatches[0], false );
|
|
}
|
|
|
|
/**
|
|
* Gets a regular expression fragmentmatching characters that
|
|
* can appear in a line after the signature.
|
|
*
|
|
* @return string regular expression fragment.
|
|
*/
|
|
static function getLineEndingRegex() {
|
|
$ignoredEndings = [
|
|
'\s*',
|
|
preg_quote( '}' ),
|
|
preg_quote( '{' ),
|
|
'\<[^\>]+\>',
|
|
preg_quote( '{{' ) . '[^}]+' . preg_quote( '}}' ),
|
|
];
|
|
|
|
$regex = '(?:' . implode( '|', $ignoredEndings ) . ')*';
|
|
|
|
return $regex;
|
|
}
|
|
|
|
/**
|
|
* Gets a regular expression that will match this wiki's
|
|
* timestamps as given by ~~~~.
|
|
*
|
|
* @throws MWException
|
|
* @return string regular expression fragment.
|
|
*/
|
|
static function getTimestampRegex() {
|
|
if ( self::$timestampRegex !== null ) {
|
|
return self::$timestampRegex;
|
|
}
|
|
|
|
// Step 1: Get an exemplar timestamp
|
|
$title = Title::newMainPage();
|
|
$user = User::newFromName( 'Test' );
|
|
$options = new ParserOptions;
|
|
|
|
global $wgParser;
|
|
$exemplarTimestamp =
|
|
$wgParser->preSaveTransform( '~~~~~', $title, $user, $options );
|
|
|
|
// Step 2: Generalise it
|
|
// Trim off the timezone to replace at the end
|
|
$output = $exemplarTimestamp;
|
|
$tzRegex = '/\s*\(\w+\)\s*$/';
|
|
$tzMatches = [];
|
|
if ( preg_match( $tzRegex, $output, $tzMatches ) ) {
|
|
$output = preg_replace( $tzRegex, '', $output );
|
|
}
|
|
$output = preg_quote( $output, '/' );
|
|
$output = preg_replace( '/[^\d\W]+/u', '[^\d\W]+', $output );
|
|
$output = preg_replace( '/\d+/u', '\d+', $output );
|
|
|
|
if ( $tzMatches ) {
|
|
$output .= preg_quote( $tzMatches[0] );
|
|
}
|
|
|
|
if ( !preg_match( "/$output/u", $exemplarTimestamp ) ) {
|
|
throw new MWException( "Timestamp regex does not match exemplar" );
|
|
}
|
|
|
|
self::$timestampRegex = $output;
|
|
|
|
return $output;
|
|
}
|
|
|
|
/**
|
|
* Parse wikitext into truncated plain text.
|
|
* @param string $text
|
|
* @param Language $lang
|
|
* @param int $length Length in characters (not bytes); default 150
|
|
* @param Title|null $title Page from which the text snippet is being extracted
|
|
* @return string
|
|
*/
|
|
static function getTextSnippet( $text, Language $lang, $length = 150, $title = null ) {
|
|
// Parse wikitext
|
|
$html = MessageCache::singleton()->parse( $text, $title )->getText( [
|
|
'enableSectionEditLinks' => false
|
|
] );
|
|
$plaintext = trim( Sanitizer::stripAllTags( $html ) );
|
|
return $lang->truncateForVisual( $plaintext, $length );
|
|
}
|
|
|
|
/**
|
|
* Parse an edit summary into truncated plain text.
|
|
* @param string $text
|
|
* @param Language $lang
|
|
* @param int $length Length in characters (not bytes); default 150
|
|
* @return string
|
|
*/
|
|
static function getTextSnippetFromSummary( $text, Language $lang, $length = 150 ) {
|
|
// Parse wikitext with summary parser
|
|
$html = Linker::formatLinksInComment( Sanitizer::escapeHtmlAllowEntities( $text ) );
|
|
$plaintext = trim( Sanitizer::stripAllTags( $html ) );
|
|
return $lang->truncateForVisual( $plaintext, $length );
|
|
}
|
|
|
|
/**
|
|
* Extract an edit excerpt from a revision
|
|
*
|
|
* @param Revision $revision
|
|
* @param Language $lang
|
|
* @param int $length Length in characters (not bytes); default 150
|
|
* @return string
|
|
*/
|
|
public static function getEditExcerpt( Revision $revision, Language $lang, $length = 150 ) {
|
|
$interpretation = self::getChangeInterpretationForRevision( $revision );
|
|
$section = self::detectSectionTitleAndText( $interpretation );
|
|
return $lang->truncateForVisual( $section['section-title'] . ' ' . $section['section-text'], $length );
|
|
}
|
|
}
|