1 files changed, 548 insertions, 81 deletions

diff --git a/includes/actions/InfoAction.php b/includes/actions/InfoAction.php
index 70edabce..ae550391 100644
--- a/includes/actions/InfoAction.php
+++ b/includes/actions/InfoAction.php
@@ -1,7 +1,6 @@
 <?php
 /**
- * Display informations about a page.
- * Very inefficient for the moment.
+ * Displays information about a page.
  *
  * Copyright © 2011 Alexandre Emsenhuber
  *
@@ -24,124 +23,592 @@
  */
 
 class InfoAction extends FormlessAction {
-
+	/**
+	 * Returns the name of the action this object responds to.
+	 *
+	 * @return string lowercase
+	 */
 	public function getName() {
 		return 'info';
 	}
 
-	protected function getDescription() {
-		return '';
+	/**
+	 * Whether this action can still be executed by a blocked user.
+	 *
+	 * @return bool
+	 */
+	public function requiresUnblock() {
+		return false;
 	}
 
+	/**
+	 * Whether this action requires the wiki not to be locked.
+	 *
+	 * @return bool
+	 */
 	public function requiresWrite() {
 		return false;
 	}
 
-	public function requiresUnblock() {
-		return false;
+	/**
+	 * Shows page information on GET request.
+	 *
+	 * @return string Page information that will be added to the output
+	 */
+	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 getPageTitle() {
-		return $this->msg( 'pageinfo-title', $this->getTitle()->getSubjectPage()->getPrefixedText() )->text();
+	/**
+	 * Creates a header that can be added to the output.
+	 *
+	 * @param $header The header text.
+	 * @return string The HTML.
+	 */
+	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 ) );
 	}
 
-	public function onView() {
-		global $wgDisableCounters;
-
-		$title = $this->getTitle()->getSubjectPage();
-
-		$pageInfo = self::pageCountInfo( $title );
-		$talkInfo = self::pageCountInfo( $title->getTalkPage() );
-
-		return Html::rawElement( 'table', array( 'class' => 'wikitable mw-page-info' ),
-			Html::rawElement( 'tr', array(),
-				Html::element( 'th', array(), '' ) .
-				Html::element( 'th', array(), $this->msg( 'pageinfo-subjectpage' )->text() ) .
-				Html::element( 'th', array(), $this->msg( 'pageinfo-talkpage' )->text() )
-			) .
-			Html::rawElement( 'tr', array(),
-				Html::element( 'th', array( 'colspan' => 3 ), $this->msg( 'pageinfo-header-edits' )->text() )
-			) .
-			Html::rawElement( 'tr', array(),
-				Html::element( 'td', array(), $this->msg( 'pageinfo-edits' )->text() ) .
-				Html::element( 'td', array(), $this->getLanguage()->formatNum( $pageInfo['edits'] ) ) .
-				Html::element( 'td', array(), $this->getLanguage()->formatNum( $talkInfo['edits'] ) )
-			) .
-			Html::rawElement( 'tr', array(),
-				Html::element( 'td', array(), $this->msg( 'pageinfo-authors' )->text() ) .
-				Html::element( 'td', array(), $this->getLanguage()->formatNum( $pageInfo['authors'] ) ) .
-				Html::element( 'td', array(), $this->getLanguage()->formatNum( $talkInfo['authors'] ) )
-			) .
-			( !$this->getUser()->isAllowed( 'unwatchedpages' ) ? '' :
-				Html::rawElement( 'tr', array(),
-					Html::element( 'th', array( 'colspan' => 3 ), $this->msg( 'pageinfo-header-watchlist' )->text() )
-				) .
-				Html::rawElement( 'tr', array(),
-					Html::element( 'td', array(), $this->msg( 'pageinfo-watchers' )->text() ) .
-					Html::element( 'td', array( 'colspan' => 2 ), $this->getLanguage()->formatNum( $pageInfo['watchers'] ) )
-				)
-			).
-			( $wgDisableCounters ? '' :
-				Html::rawElement( 'tr', array(),
-					Html::element( 'th', array( 'colspan' => 3 ), $this->msg( 'pageinfo-header-views' )->text() )
-				) .
-				Html::rawElement( 'tr', array(),
-					Html::element( 'td', array(), $this->msg( 'pageinfo-views' )->text() ) .
-					Html::element( 'td', array(), $this->getLanguage()->formatNum( $pageInfo['views'] ) ) .
-					Html::element( 'td', array(), $this->getLanguage()->formatNum( $talkInfo['views'] ) )
-				) .
-				Html::rawElement( 'tr', array(),
-					Html::element( 'td', array(), $this->msg( 'pageinfo-viewsperedit' )->text() ) .
-					Html::element( 'td', array(), $this->getLanguage()->formatNum( sprintf( '%.2f', $pageInfo['edits'] ? $pageInfo['views'] / $pageInfo['edits'] : 0 ) ) ) .
-					Html::element( 'td', array(), $this->getLanguage()->formatNum( sprintf( '%.2f', $talkInfo['edits'] ? $talkInfo['views'] / $talkInfo['edits'] : 0 ) ) )
-				)
-			)
+	/**
+	 * Adds a row to a table that will be added to the content.
+	 *
+	 * @param $table string The table that will be added to the content
+	 * @param $name string The name of the row
+	 * @param $value string The value of the row
+	 * @return string The table with the row added
+	 */
+	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 )
 		);
 	}
 
 	/**
-	 * Return the total number of edits and number of unique editors
-	 * on a given page. If page does not exist, returns false.
+	 * Adds a table to the content that will be added to the output.
 	 *
-	 * @param $title Title object
-	 * @return mixed array or boolean false
+	 * @param $content string The content that will be added to the output
+	 * @param $table string The table
+	 * @return string The content with the table added
+	 */
+	protected function addTable( $content, $table ) {
+		return $content . Html::rawElement( 'table', array( 'class' => 'wikitable mw-page-info' ),
+			$table );
+	}
+
+	/**
+	 * Returns page information in an easily-manipulated format. Array keys are used so extensions
+	 * may add additional information in arbitrary positions. Array values are arrays with one
+	 * element to be rendered as a header, arrays with two elements to be rendered as a table row.
 	 */
-	public static function pageCountInfo( $title ) {
-		$id = $title->getArticleId();
+	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__
+		);
 
-		$watchers = (int)$dbr->selectField(
-			'watchlist',
-			'COUNT(*)',
-			array(
-				'wl_title'     => $title->getDBkey(),
-				'wl_namespace' => $title->getNamespace()
+		$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 )
 			),
-			__METHOD__
+			$this->msg( 'pageinfo-redirects-value' )
+				->numParams( count( $title->getRedirectsHere() ) )
 		);
 
-		$edits = (int)$dbr->selectField(
+		// 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;
+	}
+
+	/**
+	 * Returns page counts that would be too "expensive" to retrieve by normal means.
+	 *
+	 * @param $title Title object
+	 * @param $user User object
+	 * @return array
+	 */
+	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;
 
-		$authors = (int)$dbr->selectField(
+		// 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;
 
-		$views = (int)$dbr->selectField(
-			'page',
-			'page_counter',
-			array( 'page_id' => $id ),
+		// 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() );
 
-		return array( 'watchers' => $watchers, 'edits' => $edits,
-			'authors' => $authors, 'views' => $views );
+			// 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;
+	}
+
+	/**
+	 * Returns the name that goes in the <h1> page title.
+	 *
+	 * @return string
+	 */
+	protected function getPageTitle() {
+		return $this->msg( 'pageinfo-title', $this->getTitle()->getPrefixedText() )->text();
+	}
+
+	/**
+	 * Get a list of contributors of $article
+	 * @return string: html
+	 */
+	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()
+			: '';
+	}
+
+	/**
+	 * Returns the description that goes below the <h1> tag.
+	 *
+	 * @return string
+	 */
+	protected function getDescription() {
+		return '';
 	}
 }