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