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