InfoAction.php

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<?php
class InfoAction extends FormlessAction {
        public function getName() {
                return 'info';
        }

        public function requiresUnblock() {
                return false;
        }

        public function requiresWrite() {
                return false;
        }

        public function onView() {
                $content = '';

                // Validate revision
                $oldid = $this->page->getOldID();
                if ( $oldid ) {
                        $revision = $this->page->getRevisionFetched();

                        // Revision is missing
                        if ( $revision === null ) {
                                return $this->msg( 'missing-revision', $oldid )->parse();
                        }

                        // Revision is not current
                        if ( !$revision->isCurrent() ) {
                                return $this->msg( 'pageinfo-not-current' )->plain();
                        }
                }

                // Page header
                if ( !$this->msg( 'pageinfo-header' )->isDisabled() ) {
                        $content .= $this->msg( 'pageinfo-header' )->parse();
                }

                // Hide "This page is a member of # hidden categories" explanation
                $content .= Html::element( 'style', array(),
                        '.mw-hiddenCategoriesExplanation { display: none; }' );

                // Hide "Templates used on this page" explanation
                $content .= Html::element( 'style', array(),
                        '.mw-templatesUsedExplanation { display: none; }' );

                // Get page information
                $pageInfo = $this->pageInfo();

                // Allow extensions to add additional information
                wfRunHooks( 'InfoAction', array( $this->getContext(), &$pageInfo ) );

                // Render page information
                foreach ( $pageInfo as $header => $infoTable ) {
                        $content .= $this->makeHeader( $this->msg( "pageinfo-${header}" )->escaped() );
                        $table = '';
                        foreach ( $infoTable as $infoRow ) {
                                $name = ( $infoRow[0] instanceof Message ) ? $infoRow[0]->escaped() : $infoRow[0];
                                $value = ( $infoRow[1] instanceof Message ) ? $infoRow[1]->escaped() : $infoRow[1];
                                $table = $this->addRow( $table, $name, $value );
                        }
                        $content = $this->addTable( $content, $table );
                }

                // Page footer
                if ( !$this->msg( 'pageinfo-footer' )->isDisabled() ) {
                        $content .= $this->msg( 'pageinfo-footer' )->parse();
                }

                // Page credits
                /*if ( $this->page->exists() ) {
                        $content .= Html::rawElement( 'div', array( 'id' => 'mw-credits' ), $this->getContributors() );
                }*/

                return $content;
        }

        protected function makeHeader( $header ) {
                global $wgParser;
                $spanAttribs = array( 'class' => 'mw-headline', 'id' => $wgParser->guessSectionNameFromWikiText( $header ) );
                return Html::rawElement( 'h2', array(), Html::element( 'span', $spanAttribs, $header ) );
        }

        protected function addRow( $table, $name, $value ) {
                return $table . Html::rawElement( 'tr', array(),
                        Html::rawElement( 'td', array( 'style' => 'vertical-align: top;' ), $name ) .
                        Html::rawElement( 'td', array(), $value )
                );
        }

        protected function addTable( $content, $table ) {
                return $content . Html::rawElement( 'table', array( 'class' => 'wikitable mw-page-info' ),
                        $table );
        }

        protected function pageInfo() {
                global $wgContLang, $wgRCMaxAge;

                $user = $this->getUser();
                $lang = $this->getLanguage();
                $title = $this->getTitle();
                $id = $title->getArticleID();

                // Get page information that would be too "expensive" to retrieve by normal means
                $pageCounts = self::pageCounts( $title, $user );

                // Get page properties
                $dbr = wfGetDB( DB_SLAVE );
                $result = $dbr->select(
                        'page_props',
                        array( 'pp_propname', 'pp_value' ),
                        array( 'pp_page' => $id ),
                        __METHOD__
                );

                $pageProperties = array();
                foreach ( $result as $row ) {
                        $pageProperties[$row->pp_propname] = $row->pp_value;
                }

                // Basic information
                $pageInfo = array();
                $pageInfo['header-basic'] = array();

                // Display title
                $displayTitle = $title->getPrefixedText();
                if ( !empty( $pageProperties['displaytitle'] ) ) {
                        $displayTitle = $pageProperties['displaytitle'];
                }

                $pageInfo['header-basic'][] = array(
                        $this->msg( 'pageinfo-display-title' ), $displayTitle
                );

                // Default sort key
                $sortKey = $title->getCategorySortKey();
                if ( !empty( $pageProperties['defaultsort'] ) ) {
                        $sortKey = $pageProperties['defaultsort'];
                }

                $pageInfo['header-basic'][] = array( $this->msg( 'pageinfo-default-sort' ), $sortKey );

                // Page length (in bytes)
                $pageInfo['header-basic'][] = array(
                        $this->msg( 'pageinfo-length' ), $lang->formatNum( $title->getLength() )
                );

                // Page ID (number not localised, as it's a database ID)
                $pageInfo['header-basic'][] = array( $this->msg( 'pageinfo-article-id' ), $id );

                // Search engine status
                $pOutput = new ParserOutput();
                if ( isset( $pageProperties['noindex'] ) ) {
                        $pOutput->setIndexPolicy( 'noindex' );
                }

                // Use robot policy logic
                $policy = $this->page->getRobotPolicy( 'view', $pOutput );
                $pageInfo['header-basic'][] = array(
                        $this->msg( 'pageinfo-robot-policy' ), $this->msg( "pageinfo-robot-${policy['index']}" )
                );

                if ( isset( $pageCounts['views'] ) ) {
                        // Number of views
                        $pageInfo['header-basic'][] = array(
                                $this->msg( 'pageinfo-views' ), $lang->formatNum( $pageCounts['views'] )
                        );
                }

                if ( isset( $pageCounts['watchers'] ) ) {
                        // Number of page watchers
                        $pageInfo['header-basic'][] = array(
                                $this->msg( 'pageinfo-watchers' ), $lang->formatNum( $pageCounts['watchers'] )
                        );
                }

                // Redirects to this page
                $whatLinksHere = SpecialPage::getTitleFor( 'Whatlinkshere', $title->getPrefixedText() );
                $pageInfo['header-basic'][] = array(
                        Linker::link(
                                $whatLinksHere,
                                $this->msg( 'pageinfo-redirects-name' )->escaped(),
                                array(),
                                array( 'hidelinks' => 1, 'hidetrans' => 1 )
                        ),
                        $this->msg( 'pageinfo-redirects-value' )
                                ->numParams( count( $title->getRedirectsHere() ) )
                );

                // Subpages of this page, if subpages are enabled for the current NS
                if ( MWNamespace::hasSubpages( $title->getNamespace() ) ) {
                        $prefixIndex = SpecialPage::getTitleFor( 'Prefixindex', $title->getPrefixedText() . '/' );
                        $pageInfo['header-basic'][] = array(
                                Linker::link( $prefixIndex, $this->msg( 'pageinfo-subpages-name' )->escaped() ),
                                $this->msg( 'pageinfo-subpages-value' )
                                        ->numParams(
                                                $pageCounts['subpages']['total'],
                                                $pageCounts['subpages']['redirects'],
                                                $pageCounts['subpages']['nonredirects'] )
                        );
                }

                // Page protection
                $pageInfo['header-restrictions'] = array();

                // Page protection
                foreach ( $title->getRestrictionTypes() as $restrictionType ) {
                        $protectionLevel = implode( ', ', $title->getRestrictions( $restrictionType ) );

                        if ( $protectionLevel == '' ) {
                                // Allow all users
                                $message = $this->msg( 'protect-default' )->escaped();
                        } else {
                                // Administrators only
                                $message = $this->msg( "protect-level-$protectionLevel" );
                                if ( $message->isDisabled() ) {
                                        // Require "$1" permission
                                        $message = $this->msg( "protect-fallback", $protectionLevel )->parse();
                                } else {
                                        $message = $message->escaped();
                                }
                        }

                        $pageInfo['header-restrictions'][] = array(
                                $this->msg( "restriction-$restrictionType" ), $message
                        );
                }

                if ( !$this->page->exists() ) {
                        return $pageInfo;
                }

                // Edit history
                $pageInfo['header-edits'] = array();

                $firstRev = $this->page->getOldestRevision();

                // Page creator
                $pageInfo['header-edits'][] = array(
                        $this->msg( 'pageinfo-firstuser' ),
                        Linker::revUserTools( $firstRev )
                );

                // Date of page creation
                $pageInfo['header-edits'][] = array(
                        $this->msg( 'pageinfo-firsttime' ),
                        Linker::linkKnown(
                                $title,
                                $lang->userTimeAndDate( $firstRev->getTimestamp(), $user ),
                                array(),
                                array( 'oldid' => $firstRev->getId() )
                        )
                );

                // Latest editor
                $pageInfo['header-edits'][] = array(
                        $this->msg( 'pageinfo-lastuser' ),
                        Linker::revUserTools( $this->page->getRevision() )
                );

                // Date of latest edit
                $pageInfo['header-edits'][] = array(
                        $this->msg( 'pageinfo-lasttime' ),
                        Linker::linkKnown(
                                $title,
                                $lang->userTimeAndDate( $this->page->getTimestamp(), $user ),
                                array(),
                                array( 'oldid' => $this->page->getLatest() )
                        )
                );

                // Total number of edits
                $pageInfo['header-edits'][] = array(
                        $this->msg( 'pageinfo-edits' ), $lang->formatNum( $pageCounts['edits'] )
                );

                // Total number of distinct authors
                $pageInfo['header-edits'][] = array(
                        $this->msg( 'pageinfo-authors' ), $lang->formatNum( $pageCounts['authors'] )
                );

                // Recent number of edits (within past 30 days)
                $pageInfo['header-edits'][] = array(
                        $this->msg( 'pageinfo-recent-edits', $lang->formatDuration( $wgRCMaxAge ) ),
                        $lang->formatNum( $pageCounts['recent_edits'] )
                );

                // Recent number of distinct authors
                $pageInfo['header-edits'][] = array(
                        $this->msg( 'pageinfo-recent-authors' ), $lang->formatNum( $pageCounts['recent_authors'] )
                );

                // Array of MagicWord objects
                $magicWords = MagicWord::getDoubleUnderscoreArray();

                // Array of magic word IDs
                $wordIDs = $magicWords->names;

                // Array of IDs => localized magic words
                $localizedWords = $wgContLang->getMagicWords();

                $listItems = array();
                foreach ( $pageProperties as $property => $value ) {
                        if ( in_array( $property, $wordIDs ) ) {
                                $listItems[] = Html::element( 'li', array(), $localizedWords[$property][1] );
                        }
                }

                $localizedList = Html::rawElement( 'ul', array(), implode( '', $listItems ) );
                $hiddenCategories = $this->page->getHiddenCategories();
                $transcludedTemplates = $title->getTemplateLinksFrom();

                if ( count( $listItems ) > 0
                        || count( $hiddenCategories ) > 0
                        || count( $transcludedTemplates ) > 0 ) {
                        // Page properties
                        $pageInfo['header-properties'] = array();

                        // Magic words
                        if ( count( $listItems ) > 0 ) {
                                $pageInfo['header-properties'][] = array(
                                        $this->msg( 'pageinfo-magic-words' )->numParams( count( $listItems ) ),
                                        $localizedList
                                );
                        }

                        // Hidden categories
                        if ( count( $hiddenCategories ) > 0 ) {
                                $pageInfo['header-properties'][] = array(
                                        $this->msg( 'pageinfo-hidden-categories' )
                                                ->numParams( count( $hiddenCategories ) ),
                                        Linker::formatHiddenCategories( $hiddenCategories )
                                );
                        }

                        // Transcluded templates
                        if ( count( $transcludedTemplates ) > 0 ) {
                                $pageInfo['header-properties'][] = array(
                                        $this->msg( 'pageinfo-templates' )
                                                ->numParams( count( $transcludedTemplates ) ),
                                        Linker::formatTemplates( $transcludedTemplates )
                                );
                        }
                }

                return $pageInfo;
        }

        protected static function pageCounts( $title, $user ) {
                global $wgRCMaxAge, $wgDisableCounters;

                wfProfileIn( __METHOD__ );
                $id = $title->getArticleID();

                $dbr = wfGetDB( DB_SLAVE );
                $result = array();

                if ( !$wgDisableCounters ) {
                        // Number of views
                        $views = (int) $dbr->selectField(
                                'page',
                                'page_counter',
                                array( 'page_id' => $id ),
                                __METHOD__
                        );
                        $result['views'] = $views;
                }

                if ( $user->isAllowed( 'unwatchedpages' ) ) {
                        // Number of page watchers
                        $watchers = (int) $dbr->selectField(
                                'watchlist',
                                'COUNT(*)',
                                array(
                                        'wl_namespace' => $title->getNamespace(),
                                        'wl_title'     => $title->getDBkey(),
                                ),
                                __METHOD__
                        );
                        $result['watchers'] = $watchers;
                }

                // Total number of edits
                $edits = (int) $dbr->selectField(
                        'revision',
                        'COUNT(rev_page)',
                        array( 'rev_page' => $id ),
                        __METHOD__
                );
                $result['edits'] = $edits;

                // Total number of distinct authors
                $authors = (int) $dbr->selectField(
                        'revision',
                        'COUNT(DISTINCT rev_user_text)',
                        array( 'rev_page' => $id ),
                        __METHOD__
                );
                $result['authors'] = $authors;

                // "Recent" threshold defined by $wgRCMaxAge
                $threshold = $dbr->timestamp( time() - $wgRCMaxAge );

                // Recent number of edits
                $edits = (int) $dbr->selectField(
                        'revision',
                        'COUNT(rev_page)',
                        array(
                                'rev_page' => $id ,
                                "rev_timestamp >= $threshold"
                        ),
                        __METHOD__
                );
                $result['recent_edits'] = $edits;

                // Recent number of distinct authors
                $authors = (int) $dbr->selectField(
                        'revision',
                        'COUNT(DISTINCT rev_user_text)',
                        array(
                                'rev_page' => $id,
                                "rev_timestamp >= $threshold"
                        ),
                        __METHOD__
                );
                $result['recent_authors'] = $authors;

                // Subpages (if enabled)
                if ( MWNamespace::hasSubpages( $title->getNamespace() ) ) {
                        $conds = array( 'page_namespace' => $title->getNamespace() );
                        $conds[] = 'page_title ' . $dbr->buildLike( $title->getDBkey() . '/', $dbr->anyString() );

                        // Subpages of this page (redirects)
                        $conds['page_is_redirect'] = 1;
                        $result['subpages']['redirects'] = (int) $dbr->selectField(
                                'page',
                                'COUNT(page_id)',
                                $conds,
                                __METHOD__ );

                        // Subpages of this page (non-redirects)
                        $conds['page_is_redirect'] = 0;
                        $result['subpages']['nonredirects'] = (int) $dbr->selectField(
                                'page',
                                'COUNT(page_id)',
                                $conds,
                                __METHOD__
                        );

                        // Subpages of this page (total)
                        $result['subpages']['total'] = $result['subpages']['redirects']
                                + $result['subpages']['nonredirects'];
                }

                wfProfileOut( __METHOD__ );
                return $result;
        }

        protected function getPageTitle() {
                return $this->msg( 'pageinfo-title', $this->getTitle()->getPrefixedText() )->text();
        }

        protected function getContributors() {
                global $wgHiddenPrefs;

                $contributors = $this->page->getContributors();
                $real_names = array();
                $user_names = array();
                $anon_ips = array();

                # Sift for real versus user names
                foreach ( $contributors as $user ) {
                        $page = $user->isAnon()
                                ? SpecialPage::getTitleFor( 'Contributions', $user->getName() )
                                : $user->getUserPage();

                        if ( $user->getID() == 0 ) {
                                $anon_ips[] = Linker::link( $page, htmlspecialchars( $user->getName() ) );
                        } elseif ( !in_array( 'realname', $wgHiddenPrefs ) && $user->getRealName() ) {
                                $real_names[] = Linker::link( $page, htmlspecialchars( $user->getRealName() ) );
                        } else {
                                $user_names[] = Linker::link( $page, htmlspecialchars( $user->getName() ) );
                        }
                }

                $lang = $this->getLanguage();

                $real = $lang->listToText( $real_names );

                # "ThisSite user(s) A, B and C"
                if ( count( $user_names ) ) {
                        $user = $this->msg( 'siteusers' )->rawParams( $lang->listToText( $user_names ) )->params(
                                count( $user_names ) )->escaped();
                } else {
                        $user = false;
                }

                if ( count( $anon_ips ) ) {
                        $anon = $this->msg( 'anonusers' )->rawParams( $lang->listToText( $anon_ips ) )->params(
                                count( $anon_ips ) )->escaped();
                } else {
                        $anon = false;
                }

                # This is the big list, all mooshed together. We sift for blank strings
                $fulllist = array();
                foreach ( array( $real, $user, $anon ) as $s ) {
                        if ( $s !== '' ) {
                                array_push( $fulllist, $s );
                        }
                }

                $count = count( $fulllist );
                # "Based on work by ..."
                return $count
                        ? $this->msg( 'othercontribs' )->rawParams(
                                $lang->listToText( $fulllist ) )->params( $count )->escaped()
                        : '';
        }

        protected function getDescription() {
                return '';
        }
}