includes/actions/InfoAction.php

   1 <?php
   2 /**
   3  * Displays information about a page.
   4  *
   5  * Copyright © 2011 Alexandre Emsenhuber
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
  20  *
  21  * @file
  22  * @ingroup Actions
  23  */
  24
  25 /**
  26  * Displays information about a page.
  27  *
  28  * @ingroup Actions
  29  */
  30 class InfoAction extends FormlessAction {
  31         const CACHE_VERSION = '2013-03-17';
  32
  33         /**
  34          * Returns the name of the action this object responds to.
  35          *
  36          * @return string lowercase
  37          */
  38         public function getName() {
  39                 return 'info';
  40         }
  41
  42         /**
  43          * Whether this action can still be executed by a blocked user.
  44          *
  45          * @return bool
  46          */
  47         public function requiresUnblock() {
  48                 return false;
  49         }
  50
  51         /**
  52          * Whether this action requires the wiki not to be locked.
  53          *
  54          * @return bool
  55          */
  56         public function requiresWrite() {
  57                 return false;
  58         }
  59
  60         /**
  61          * Clear the info cache for a given Title.
  62          *
  63          * @since 1.22
  64          * @param Title $title Title to clear cache for
  65          */
  66         public static function invalidateCache( Title $title ) {
  67                 global $wgMemc;
  68                 // Clear page info.
  69                 $revision = WikiPage::factory( $title )->getRevision();
  70                 if ( $revision !== null ) {
  71                         $key = wfMemcKey( 'infoaction', sha1( $title->getPrefixedText() ), $revision->getId() );
  72                         $wgMemc->delete( $key );
  73                 }
  74         }
  75
  76         /**
  77          * Shows page information on GET request.
  78          *
  79          * @return string Page information that will be added to the output
  80          */
  81         public function onView() {
  82                 $content = '';
  83
  84                 // Validate revision
  85                 $oldid = $this->page->getOldID();
  86                 if ( $oldid ) {
  87                         $revision = $this->page->getRevisionFetched();
  88
  89                         // Revision is missing
  90                         if ( $revision === null ) {
  91                                 return $this->msg( 'missing-revision', $oldid )->parse();
  92                         }
  93
  94                         // Revision is not current
  95                         if ( !$revision->isCurrent() ) {
  96                                 return $this->msg( 'pageinfo-not-current' )->plain();
  97                         }
  98                 }
  99
 100                 // Page header
 101                 if ( !$this->msg( 'pageinfo-header' )->isDisabled() ) {
 102                         $content .= $this->msg( 'pageinfo-header' )->parse();
 103                 }
 104
 105                 // Hide "This page is a member of # hidden categories" explanation
 106                 $content .= Html::element( 'style', array(),
 107                         '.mw-hiddenCategoriesExplanation { display: none; }' ) . "\n";
 108
 109                 // Hide "Templates used on this page" explanation
 110                 $content .= Html::element( 'style', array(),
 111                         '.mw-templatesUsedExplanation { display: none; }' ) . "\n";
 112
 113                 // Get page information
 114                 $pageInfo = $this->pageInfo();
 115
 116                 // Allow extensions to add additional information
 117                 wfRunHooks( 'InfoAction', array( $this->getContext(), &$pageInfo ) );
 118
 119                 // Render page information
 120                 foreach ( $pageInfo as $header => $infoTable ) {
 121                         // Messages:
 122                         // pageinfo-header-basic, pageinfo-header-edits, pageinfo-header-restrictions,
 123                         // pageinfo-header-properties, pageinfo-category-info
 124                         $content .= $this->makeHeader( $this->msg( "pageinfo-${header}" )->escaped() ) . "\n";
 125                         $table = "\n";
 126                         foreach ( $infoTable as $infoRow ) {
 127                                 $name = ( $infoRow[0] instanceof Message ) ? $infoRow[0]->escaped() : $infoRow[0];
 128                                 $value = ( $infoRow[1] instanceof Message ) ? $infoRow[1]->escaped() : $infoRow[1];
 129                                 $id = ( $infoRow[0] instanceof Message ) ? $infoRow[0]->getKey() : null;
 130                                 $table = $this->addRow( $table, $name, $value, $id ) . "\n";
 131                         }
 132                         $content = $this->addTable( $content, $table ) . "\n";
 133                 }
 134
 135                 // Page footer
 136                 if ( !$this->msg( 'pageinfo-footer' )->isDisabled() ) {
 137                         $content .= $this->msg( 'pageinfo-footer' )->parse();
 138                 }
 139
 140                 // Page credits
 141                 /*if ( $this->page->exists() ) {
 142                         $content .= Html::rawElement( 'div', array( 'id' => 'mw-credits' ), $this->getContributors() );
 143                 }*/
 144
 145                 return $content;
 146         }
 147
 148         /**
 149          * Creates a header that can be added to the output.
 150          *
 151          * @param string $header The header text.
 152          * @return string The HTML.
 153          */
 154         protected function makeHeader( $header ) {
 155                 $spanAttribs = array( 'class' => 'mw-headline', 'id' => Sanitizer::escapeId( $header ) );
 156                 return Html::rawElement( 'h2', array(), Html::element( 'span', $spanAttribs, $header ) );
 157         }
 158
 159         /**
 160          * Adds a row to a table that will be added to the content.
 161          *
 162          * @param string $table The table that will be added to the content
 163          * @param string $name The name of the row
 164          * @param string $value The value of the row
 165          * @param string $id The ID to use for the 'tr' element
 166          * @return string The table with the row added
 167          */
 168         protected function addRow( $table, $name, $value, $id ) {
 169                 return $table . Html::rawElement( 'tr', $id === null ? array() : array( 'id' => 'mw-' . $id ),
 170                         Html::rawElement( 'td', array( 'style' => 'vertical-align: top;' ), $name ) .
 171                         Html::rawElement( 'td', array(), $value )
 172                 );
 173         }
 174
 175         /**
 176          * Adds a table to the content that will be added to the output.
 177          *
 178          * @param string $content The content that will be added to the output
 179          * @param string $table The table
 180          * @return string The content with the table added
 181          */
 182         protected function addTable( $content, $table ) {
 183                 return $content . Html::rawElement( 'table', array( 'class' => 'wikitable mw-page-info' ),
 184                         $table );
 185         }
 186
 187         /**
 188          * Returns page information in an easily-manipulated format. Array keys are used so extensions
 189          * may add additional information in arbitrary positions. Array values are arrays with one
 190          * element to be rendered as a header, arrays with two elements to be rendered as a table row.
 191          *
 192          * @return array
 193          */
 194         protected function pageInfo() {
 195                 global $wgContLang, $wgRCMaxAge, $wgMemc,
 196                         $wgUnwatchedPageThreshold, $wgPageInfoTransclusionLimit;
 197
 198                 $user = $this->getUser();
 199                 $lang = $this->getLanguage();
 200                 $title = $this->getTitle();
 201                 $id = $title->getArticleID();
 202
 203                 $memcKey = wfMemcKey( 'infoaction',
 204                         sha1( $title->getPrefixedText() ), $this->page->getLatest() );
 205                 $pageCounts = $wgMemc->get( $memcKey );
 206                 $version = isset( $pageCounts['cacheversion'] ) ? $pageCounts['cacheversion'] : false;
 207                 if ( $pageCounts === false || $version !== self::CACHE_VERSION ) {
 208                         // Get page information that would be too "expensive" to retrieve by normal means
 209                         $pageCounts = self::pageCounts( $title );
 210                         $pageCounts['cacheversion'] = self::CACHE_VERSION;
 211
 212                         $wgMemc->set( $memcKey, $pageCounts );
 213                 }
 214
 215                 // Get page properties
 216                 $dbr = wfGetDB( DB_SLAVE );
 217                 $result = $dbr->select(
 218                         'page_props',
 219                         array( 'pp_propname', 'pp_value' ),
 220                         array( 'pp_page' => $id ),
 221                         __METHOD__
 222                 );
 223
 224                 $pageProperties = array();
 225                 foreach ( $result as $row ) {
 226                         $pageProperties[$row->pp_propname] = $row->pp_value;
 227                 }
 228
 229                 // Basic information
 230                 $pageInfo = array();
 231                 $pageInfo['header-basic'] = array();
 232
 233                 // Display title
 234                 $displayTitle = $title->getPrefixedText();
 235                 if ( !empty( $pageProperties['displaytitle'] ) ) {
 236                         $displayTitle = $pageProperties['displaytitle'];
 237                 }
 238
 239                 $pageInfo['header-basic'][] = array(
 240                         $this->msg( 'pageinfo-display-title' ), $displayTitle
 241                 );
 242
 243                 // Is it a redirect? If so, where to?
 244                 if ( $title->isRedirect() ) {
 245                         $pageInfo['header-basic'][] = array(
 246                                 $this->msg( 'pageinfo-redirectsto' ),
 247                                 Linker::link( $this->page->getRedirectTarget() ) .
 248                                 $this->msg( 'word-separator' )->text() .
 249                                 $this->msg( 'parentheses', Linker::link(
 250                                         $this->page->getRedirectTarget(),
 251                                         $this->msg( 'pageinfo-redirectsto-info' )->escaped(),
 252                                         array(),
 253                                         array( 'action' => 'info' )
 254                                 ) )->text()
 255                         );
 256                 }
 257
 258                 // Default sort key
 259                 $sortKey = $title->getCategorySortkey();
 260                 if ( !empty( $pageProperties['defaultsort'] ) ) {
 261                         $sortKey = $pageProperties['defaultsort'];
 262                 }
 263
 264                 $pageInfo['header-basic'][] = array( $this->msg( 'pageinfo-default-sort' ), $sortKey );
 265
 266                 // Page length (in bytes)
 267                 $pageInfo['header-basic'][] = array(
 268                         $this->msg( 'pageinfo-length' ), $lang->formatNum( $title->getLength() )
 269                 );
 270
 271                 // Page ID (number not localised, as it's a database ID)
 272                 $pageInfo['header-basic'][] = array( $this->msg( 'pageinfo-article-id' ), $id );
 273
 274                 // Language in which the page content is (supposed to be) written
 275                 $pageLang = $title->getPageLanguage()->getCode();
 276                 $pageInfo['header-basic'][] = array( $this->msg( 'pageinfo-language' ),
 277                         Language::fetchLanguageName( $pageLang, $lang->getCode() )
 278                         . ' ' . $this->msg( 'parentheses', $pageLang ) );
 279
 280                 // Search engine status
 281                 $pOutput = new ParserOutput();
 282                 if ( isset( $pageProperties['noindex'] ) ) {
 283                         $pOutput->setIndexPolicy( 'noindex' );
 284                 }
 285
 286                 // Use robot policy logic
 287                 $policy = $this->page->getRobotPolicy( 'view', $pOutput );
 288                 $pageInfo['header-basic'][] = array(
 289                         // Messages: pageinfo-robot-index, pageinfo-robot-noindex
 290                         $this->msg( 'pageinfo-robot-policy' ), $this->msg( "pageinfo-robot-${policy['index']}" )
 291                 );
 292
 293                 if ( isset( $pageCounts['views'] ) ) {
 294                         // Number of views
 295                         $pageInfo['header-basic'][] = array(
 296                                 $this->msg( 'pageinfo-views' ), $lang->formatNum( $pageCounts['views'] )
 297                         );
 298                 }
 299
 300                 if (
 301                         $user->isAllowed( 'unwatchedpages' ) ||
 302                         ( $wgUnwatchedPageThreshold !== false &&
 303                           $pageCounts['watchers'] >= $wgUnwatchedPageThreshold )
 304                 ) {
 305                         // Number of page watchers
 306                         $pageInfo['header-basic'][] = array(
 307                                 $this->msg( 'pageinfo-watchers' ), $lang->formatNum( $pageCounts['watchers'] )
 308                         );
 309                 } elseif ( $wgUnwatchedPageThreshold !== false ) {
 310                         $pageInfo['header-basic'][] = array(
 311                                 $this->msg( 'pageinfo-watchers' ),
 312                                 $this->msg( 'pageinfo-few-watchers' )->numParams( $wgUnwatchedPageThreshold )
 313                         );
 314                 }
 315
 316                 // Redirects to this page
 317                 $whatLinksHere = SpecialPage::getTitleFor( 'Whatlinkshere', $title->getPrefixedText() );
 318                 $pageInfo['header-basic'][] = array(
 319                         Linker::link(
 320                                 $whatLinksHere,
 321                                 $this->msg( 'pageinfo-redirects-name' )->escaped(),
 322                                 array(),
 323                                 array( 'hidelinks' => 1, 'hidetrans' => 1 )
 324                         ),
 325                         $this->msg( 'pageinfo-redirects-value' )
 326                                 ->numParams( count( $title->getRedirectsHere() ) )
 327                 );
 328
 329                 // Is it counted as a content page?
 330                 if ( $this->page->isCountable() ) {
 331                         $pageInfo['header-basic'][] = array(
 332                                 $this->msg( 'pageinfo-contentpage' ),
 333                                 $this->msg( 'pageinfo-contentpage-yes' )
 334                         );
 335                 }
 336
 337                 // Subpages of this page, if subpages are enabled for the current NS
 338                 if ( MWNamespace::hasSubpages( $title->getNamespace() ) ) {
 339                         $prefixIndex = SpecialPage::getTitleFor( 'Prefixindex', $title->getPrefixedText() . '/' );
 340                         $pageInfo['header-basic'][] = array(
 341                                 Linker::link( $prefixIndex, $this->msg( 'pageinfo-subpages-name' )->escaped() ),
 342                                 $this->msg( 'pageinfo-subpages-value' )
 343                                         ->numParams(
 344                                                 $pageCounts['subpages']['total'],
 345                                                 $pageCounts['subpages']['redirects'],
 346                                                 $pageCounts['subpages']['nonredirects'] )
 347                         );
 348                 }
 349
 350                 if ( $title->inNamespace( NS_CATEGORY ) ) {
 351                         $category = Category::newFromTitle( $title );
 352                         $pageInfo['category-info'] = array(
 353                                 array(
 354                                         $this->msg( 'pageinfo-category-pages' ),
 355                                         $lang->formatNum( $category->getPageCount() )
 356                                 ),
 357                                 array(
 358                                         $this->msg( 'pageinfo-category-subcats' ),
 359                                         $lang->formatNum( $category->getSubcatCount() )
 360                                 ),
 361                                 array(
 362                                         $this->msg( 'pageinfo-category-files' ),
 363                                         $lang->formatNum( $category->getFileCount() )
 364                                 )
 365                         );
 366                 }
 367
 368                 // Page protection
 369                 $pageInfo['header-restrictions'] = array();
 370
 371                 // Is this page effected by the cascading protection of something which includes it?
 372                 if ( $title->isCascadeProtected() ) {
 373                         $cascadingFrom = '';
 374                         $sources = $title->getCascadeProtectionSources(); // Array deferencing is in PHP 5.4 :(
 375
 376                         foreach ( $sources[0] as $sourceTitle ) {
 377                                 $cascadingFrom .= Html::rawElement( 'li', array(), Linker::linkKnown( $sourceTitle ) );
 378                         }
 379
 380                         $cascadingFrom = Html::rawElement( 'ul', array(), $cascadingFrom );
 381                         $pageInfo['header-restrictions'][] = array(
 382                                 $this->msg( 'pageinfo-protect-cascading-from' ),
 383                                 $cascadingFrom
 384                         );
 385                 }
 386
 387                 // Is out protection set to cascade to other pages?
 388                 if ( $title->areRestrictionsCascading() ) {
 389                         $pageInfo['header-restrictions'][] = array(
 390                                 $this->msg( 'pageinfo-protect-cascading' ),
 391                                 $this->msg( 'pageinfo-protect-cascading-yes' )
 392                         );
 393                 }
 394
 395                 // Page protection
 396                 foreach ( $title->getRestrictionTypes() as $restrictionType ) {
 397                         $protectionLevel = implode( ', ', $title->getRestrictions( $restrictionType ) );
 398
 399                         if ( $protectionLevel == '' ) {
 400                                 // Allow all users
 401                                 $message = $this->msg( 'protect-default' )->escaped();
 402                         } else {
 403                                 // Administrators only
 404                                 // Messages: protect-level-autoconfirmed, protect-level-sysop
 405                                 $message = $this->msg( "protect-level-$protectionLevel" );
 406                                 if ( $message->isDisabled() ) {
 407                                         // Require "$1" permission
 408                                         $message = $this->msg( "protect-fallback", $protectionLevel )->parse();
 409                                 } else {
 410                                         $message = $message->escaped();
 411                                 }
 412                         }
 413
 414                         // Messages: restriction-edit, restriction-move, restriction-create,
 415                         // restriction-upload
 416                         $pageInfo['header-restrictions'][] = array(
 417                                 $this->msg( "restriction-$restrictionType" ), $message
 418                         );
 419                 }
 420
 421                 if ( !$this->page->exists() ) {
 422                         return $pageInfo;
 423                 }
 424
 425                 // Edit history
 426                 $pageInfo['header-edits'] = array();
 427
 428                 $firstRev = $this->page->getOldestRevision();
 429                 $lastRev = $this->page->getRevision();
 430                 $batch = new LinkBatch;
 431
 432                 if ( $firstRev ) {
 433                         $firstRevUser = $firstRev->getUserText( Revision::FOR_THIS_USER );
 434                         if ( $firstRevUser !== '' ) {
 435                                 $batch->add( NS_USER, $firstRevUser );
 436                                 $batch->add( NS_USER_TALK, $firstRevUser );
 437                         }
 438                 }
 439
 440                 if ( $lastRev ) {
 441                         $lastRevUser = $lastRev->getUserText( Revision::FOR_THIS_USER );
 442                         if ( $lastRevUser !== '' ) {
 443                                 $batch->add( NS_USER, $lastRevUser );
 444                                 $batch->add( NS_USER_TALK, $lastRevUser );
 445                         }
 446                 }
 447
 448                 $batch->execute();
 449
 450                 if ( $firstRev ) {
 451                         // Page creator
 452                         $pageInfo['header-edits'][] = array(
 453                                 $this->msg( 'pageinfo-firstuser' ),
 454                                 Linker::revUserTools( $firstRev )
 455                         );
 456
 457                         // Date of page creation
 458                         $pageInfo['header-edits'][] = array(
 459                                 $this->msg( 'pageinfo-firsttime' ),
 460                                 Linker::linkKnown(
 461                                         $title,
 462                                         $lang->userTimeAndDate( $firstRev->getTimestamp(), $user ),
 463                                         array(),
 464                                         array( 'oldid' => $firstRev->getId() )
 465                                 )
 466                         );
 467                 }
 468
 469                 if ( $lastRev ) {
 470                         // Latest editor
 471                         $pageInfo['header-edits'][] = array(
 472                                 $this->msg( 'pageinfo-lastuser' ),
 473                                 Linker::revUserTools( $lastRev )
 474                         );
 475
 476                         // Date of latest edit
 477                         $pageInfo['header-edits'][] = array(
 478                                 $this->msg( 'pageinfo-lasttime' ),
 479                                 Linker::linkKnown(
 480                                         $title,
 481                                         $lang->userTimeAndDate( $this->page->getTimestamp(), $user ),
 482                                         array(),
 483                                         array( 'oldid' => $this->page->getLatest() )
 484                                 )
 485                         );
 486                 }
 487
 488                 // Total number of edits
 489                 $pageInfo['header-edits'][] = array(
 490                         $this->msg( 'pageinfo-edits' ), $lang->formatNum( $pageCounts['edits'] )
 491                 );
 492
 493                 // Total number of distinct authors
 494                 $pageInfo['header-edits'][] = array(
 495                         $this->msg( 'pageinfo-authors' ), $lang->formatNum( $pageCounts['authors'] )
 496                 );
 497
 498                 // Recent number of edits (within past 30 days)
 499                 $pageInfo['header-edits'][] = array(
 500                         $this->msg( 'pageinfo-recent-edits', $lang->formatDuration( $wgRCMaxAge ) ),
 501                         $lang->formatNum( $pageCounts['recent_edits'] )
 502                 );
 503
 504                 // Recent number of distinct authors
 505                 $pageInfo['header-edits'][] = array(
 506                         $this->msg( 'pageinfo-recent-authors' ), $lang->formatNum( $pageCounts['recent_authors'] )
 507                 );
 508
 509                 // Array of MagicWord objects
 510                 $magicWords = MagicWord::getDoubleUnderscoreArray();
 511
 512                 // Array of magic word IDs
 513                 $wordIDs = $magicWords->names;
 514
 515                 // Array of IDs => localized magic words
 516                 $localizedWords = $wgContLang->getMagicWords();
 517
 518                 $listItems = array();
 519                 foreach ( $pageProperties as $property => $value ) {
 520                         if ( in_array( $property, $wordIDs ) ) {
 521                                 $listItems[] = Html::element( 'li', array(), $localizedWords[$property][1] );
 522                         }
 523                 }
 524
 525                 $localizedList = Html::rawElement( 'ul', array(), implode( '', $listItems ) );
 526                 $hiddenCategories = $this->page->getHiddenCategories();
 527
 528                 if (
 529                         count( $listItems ) > 0 ||
 530                         count( $hiddenCategories ) > 0 ||
 531                         $pageCounts['transclusion']['from'] > 0 ||
 532                         $pageCounts['transclusion']['to'] > 0
 533                 ) {
 534                         $options = array( 'LIMIT' => $wgPageInfoTransclusionLimit );
 535                         $transcludedTemplates = $title->getTemplateLinksFrom( $options );
 536                         $transcludedTargets = $title->getTemplateLinksTo( $options );
 537
 538                         // Page properties
 539                         $pageInfo['header-properties'] = array();
 540
 541                         // Magic words
 542                         if ( count( $listItems ) > 0 ) {
 543                                 $pageInfo['header-properties'][] = array(
 544                                         $this->msg( 'pageinfo-magic-words' )->numParams( count( $listItems ) ),
 545                                         $localizedList
 546                                 );
 547                         }
 548
 549                         // Hidden categories
 550                         if ( count( $hiddenCategories ) > 0 ) {
 551                                 $pageInfo['header-properties'][] = array(
 552                                         $this->msg( 'pageinfo-hidden-categories' )
 553                                                 ->numParams( count( $hiddenCategories ) ),
 554                                         Linker::formatHiddenCategories( $hiddenCategories )
 555                                 );
 556                         }
 557
 558                         // Transcluded templates
 559                         if ( $pageCounts['transclusion']['from'] > 0 ) {
 560                                 if ( $pageCounts['transclusion']['from'] > count( $transcludedTemplates ) ) {
 561                                         $more = $this->msg( 'morenotlisted' )->escaped();
 562                                 } else {
 563                                         $more = null;
 564                                 }
 565
 566                                 $pageInfo['header-properties'][] = array(
 567                                         $this->msg( 'pageinfo-templates' )
 568                                                 ->numParams( $pageCounts['transclusion']['from'] ),
 569                                         Linker::formatTemplates(
 570                                                 $transcludedTemplates,
 571                                                 false,
 572                                                 false,
 573                                                 $more )
 574                                 );
 575                         }
 576
 577                         if ( $pageCounts['transclusion']['to'] > 0 ) {
 578                                 if ( $pageCounts['transclusion']['to'] > count( $transcludedTargets ) ) {
 579                                         $more = Linker::link(
 580                                                 $whatLinksHere,
 581                                                 $this->msg( 'moredotdotdot' )->escaped(),
 582                                                 array(),
 583                                                 array( 'hidelinks' => 1, 'hideredirs' => 1 )
 584                                         );
 585                                 } else {
 586                                         $more = null;
 587                                 }
 588
 589                                 $pageInfo['header-properties'][] = array(
 590                                         $this->msg( 'pageinfo-transclusions' )
 591                                                 ->numParams( $pageCounts['transclusion']['to'] ),
 592                                         Linker::formatTemplates(
 593                                                 $transcludedTargets,
 594                                                 false,
 595                                                 false,
 596                                                 $more )
 597                                 );
 598                         }
 599                 }
 600
 601                 return $pageInfo;
 602         }
 603
 604         /**
 605          * Returns page counts that would be too "expensive" to retrieve by normal means.
 606          *
 607          * @param Title $title Title to get counts for
 608          * @return array
 609          */
 610         protected static function pageCounts( Title $title ) {
 611                 global $wgRCMaxAge, $wgDisableCounters;
 612
 613                 wfProfileIn( __METHOD__ );
 614                 $id = $title->getArticleID();
 615
 616                 $dbr = wfGetDB( DB_SLAVE );
 617                 $result = array();
 618
 619                 if ( !$wgDisableCounters ) {
 620                         // Number of views
 621                         $views = (int)$dbr->selectField(
 622                                 'page',
 623                                 'page_counter',
 624                                 array( 'page_id' => $id ),
 625                                 __METHOD__
 626                         );
 627                         $result['views'] = $views;
 628                 }
 629
 630                 // Number of page watchers
 631                 $watchers = (int)$dbr->selectField(
 632                         'watchlist',
 633                         'COUNT(*)',
 634                         array(
 635                                 'wl_namespace' => $title->getNamespace(),
 636                                 'wl_title' => $title->getDBkey(),
 637                         ),
 638                         __METHOD__
 639                 );
 640                 $result['watchers'] = $watchers;
 641
 642                 // Total number of edits
 643                 $edits = (int)$dbr->selectField(
 644                         'revision',
 645                         'COUNT(rev_page)',
 646                         array( 'rev_page' => $id ),
 647                         __METHOD__
 648                 );
 649                 $result['edits'] = $edits;
 650
 651                 // Total number of distinct authors
 652                 $authors = (int)$dbr->selectField(
 653                         'revision',
 654                         'COUNT(DISTINCT rev_user_text)',
 655                         array( 'rev_page' => $id ),
 656                         __METHOD__
 657                 );
 658                 $result['authors'] = $authors;
 659
 660                 // "Recent" threshold defined by $wgRCMaxAge
 661                 $threshold = $dbr->timestamp( time() - $wgRCMaxAge );
 662
 663                 // Recent number of edits
 664                 $edits = (int)$dbr->selectField(
 665                         'revision',
 666                         'COUNT(rev_page)',
 667                         array(
 668                                 'rev_page' => $id,
 669                                 "rev_timestamp >= " . $dbr->addQuotes( $threshold )
 670                         ),
 671                         __METHOD__
 672                 );
 673                 $result['recent_edits'] = $edits;
 674
 675                 // Recent number of distinct authors
 676                 $authors = (int)$dbr->selectField(
 677                         'revision',
 678                         'COUNT(DISTINCT rev_user_text)',
 679                         array(
 680                                 'rev_page' => $id,
 681                                 "rev_timestamp >= " . $dbr->addQuotes( $threshold )
 682                         ),
 683                         __METHOD__
 684                 );
 685                 $result['recent_authors'] = $authors;
 686
 687                 // Subpages (if enabled)
 688                 if ( MWNamespace::hasSubpages( $title->getNamespace() ) ) {
 689                         $conds = array( 'page_namespace' => $title->getNamespace() );
 690                         $conds[] = 'page_title ' . $dbr->buildLike( $title->getDBkey() . '/', $dbr->anyString() );
 691
 692                         // Subpages of this page (redirects)
 693                         $conds['page_is_redirect'] = 1;
 694                         $result['subpages']['redirects'] = (int)$dbr->selectField(
 695                                 'page',
 696                                 'COUNT(page_id)',
 697                                 $conds,
 698                                 __METHOD__ );
 699
 700                         // Subpages of this page (non-redirects)
 701                         $conds['page_is_redirect'] = 0;
 702                         $result['subpages']['nonredirects'] = (int)$dbr->selectField(
 703                                 'page',
 704                                 'COUNT(page_id)',
 705                                 $conds,
 706                                 __METHOD__
 707                         );
 708
 709                         // Subpages of this page (total)
 710                         $result['subpages']['total'] = $result['subpages']['redirects']
 711                                 + $result['subpages']['nonredirects'];
 712                 }
 713
 714                 // Counts for the number of transclusion links (to/from)
 715                 $result['transclusion']['to'] = (int)$dbr->selectField(
 716                         'templatelinks',
 717                         'COUNT(tl_from)',
 718                         array(
 719                                 'tl_namespace' => $title->getNamespace(),
 720                                 'tl_title' => $title->getDBkey()
 721                         ),
 722                         __METHOD__
 723                 );
 724
 725                 $result['transclusion']['from'] = (int)$dbr->selectField(
 726                         'templatelinks',
 727                         'COUNT(*)',
 728                         array( 'tl_from' => $title->getArticleID() ),
 729                         __METHOD__
 730                 );
 731
 732                 wfProfileOut( __METHOD__ );
 733                 return $result;
 734         }
 735
 736         /**
 737          * Returns the name that goes in the "<h1>" page title.
 738          *
 739          * @return string
 740          */
 741         protected function getPageTitle() {
 742                 return $this->msg( 'pageinfo-title', $this->getTitle()->getPrefixedText() )->text();
 743         }
 744
 745         /**
 746          * Get a list of contributors of $article
 747          * @return string: html
 748          */
 749         protected function getContributors() {
 750                 global $wgHiddenPrefs;
 751
 752                 $contributors = $this->page->getContributors();
 753                 $real_names = array();
 754                 $user_names = array();
 755                 $anon_ips = array();
 756
 757                 # Sift for real versus user names
 758                 foreach ( $contributors as $user ) {
 759                         $page = $user->isAnon()
 760                                 ? SpecialPage::getTitleFor( 'Contributions', $user->getName() )
 761                                 : $user->getUserPage();
 762
 763                         if ( $user->getID() == 0 ) {
 764                                 $anon_ips[] = Linker::link( $page, htmlspecialchars( $user->getName() ) );
 765                         } elseif ( !in_array( 'realname', $wgHiddenPrefs ) && $user->getRealName() ) {
 766                                 $real_names[] = Linker::link( $page, htmlspecialchars( $user->getRealName() ) );
 767                         } else {
 768                                 $user_names[] = Linker::link( $page, htmlspecialchars( $user->getName() ) );
 769                         }
 770                 }
 771
 772                 $lang = $this->getLanguage();
 773
 774                 $real = $lang->listToText( $real_names );
 775
 776                 # "ThisSite user(s) A, B and C"
 777                 if ( count( $user_names ) ) {
 778                         $user = $this->msg( 'siteusers' )->rawParams( $lang->listToText( $user_names ) )->params(
 779                                 count( $user_names ) )->escaped();
 780                 } else {
 781                         $user = false;
 782                 }
 783
 784                 if ( count( $anon_ips ) ) {
 785                         $anon = $this->msg( 'anonusers' )->rawParams( $lang->listToText( $anon_ips ) )->params(
 786                                 count( $anon_ips ) )->escaped();
 787                 } else {
 788                         $anon = false;
 789                 }
 790
 791                 # This is the big list, all mooshed together. We sift for blank strings
 792                 $fulllist = array();
 793                 foreach ( array( $real, $user, $anon ) as $s ) {
 794                         if ( $s !== '' ) {
 795                                 array_push( $fulllist, $s );
 796                         }
 797                 }
 798
 799                 $count = count( $fulllist );
 800                 # "Based on work by ..."
 801                 return $count
 802                         ? $this->msg( 'othercontribs' )->rawParams(
 803                                 $lang->listToText( $fulllist ) )->params( $count )->escaped()
 804                         : '';
 805         }
 806
 807         /**
 808          * Returns the description that goes below the "<h1>" tag.
 809          *
 810          * @return string
 811          */
 812         protected function getDescription() {
 813                 return '';
 814         }
 815 }