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 VERSION = 1;
  32
  33         /**
  34          * Returns the name of the action this object responds to.
  35          *
  36          * @return string Lowercase name
  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          * @param int|null $revid Revision id to clear
  66          */
  67         public static function invalidateCache( Title $title, $revid = null ) {
  68                 if ( !$revid ) {
  69                         $revision = Revision::newFromTitle( $title, 0, Revision::READ_LATEST );
  70                         $revid = $revision ? $revision->getId() : null;
  71                 }
  72                 if ( $revid !== null ) {
  73                         $key = self::getCacheKey( $title, $revid );
  74                         ObjectCache::getMainWANInstance()->delete( $key );
  75                 }
  76         }
  77
  78         /**
  79          * Shows page information on GET request.
  80          *
  81          * @return string Page information that will be added to the output
  82          */
  83         public function onView() {
  84                 $content = '';
  85
  86                 // Validate revision
  87                 $oldid = $this->page->getOldID();
  88                 if ( $oldid ) {
  89                         $revision = $this->page->getRevisionFetched();
  90
  91                         // Revision is missing
  92                         if ( $revision === null ) {
  93                                 return $this->msg( 'missing-revision', $oldid )->parse();
  94                         }
  95
  96                         // Revision is not current
  97                         if ( !$revision->isCurrent() ) {
  98                                 return $this->msg( 'pageinfo-not-current' )->plain();
  99                         }
 100                 }
 101
 102                 // Page header
 103                 if ( !$this->msg( 'pageinfo-header' )->isDisabled() ) {
 104                         $content .= $this->msg( 'pageinfo-header' )->parse();
 105                 }
 106
 107                 // Hide "This page is a member of # hidden categories" explanation
 108                 $content .= Html::element( 'style', array(),
 109                         '.mw-hiddenCategoriesExplanation { display: none; }' ) . "\n";
 110
 111                 // Hide "Templates used on this page" explanation
 112                 $content .= Html::element( 'style', array(),
 113                         '.mw-templatesUsedExplanation { display: none; }' ) . "\n";
 114
 115                 // Get page information
 116                 $pageInfo = $this->pageInfo();
 117
 118                 // Allow extensions to add additional information
 119                 Hooks::run( 'InfoAction', array( $this->getContext(), &$pageInfo ) );
 120
 121                 // Render page information
 122                 foreach ( $pageInfo as $header => $infoTable ) {
 123                         // Messages:
 124                         // pageinfo-header-basic, pageinfo-header-edits, pageinfo-header-restrictions,
 125                         // pageinfo-header-properties, pageinfo-category-info
 126                         $content .= $this->makeHeader( $this->msg( "pageinfo-${header}" )->escaped() ) . "\n";
 127                         $table = "\n";
 128                         foreach ( $infoTable as $infoRow ) {
 129                                 $name = ( $infoRow[0] instanceof Message ) ? $infoRow[0]->escaped() : $infoRow[0];
 130                                 $value = ( $infoRow[1] instanceof Message ) ? $infoRow[1]->escaped() : $infoRow[1];
 131                                 $id = ( $infoRow[0] instanceof Message ) ? $infoRow[0]->getKey() : null;
 132                                 $table = $this->addRow( $table, $name, $value, $id ) . "\n";
 133                         }
 134                         $content = $this->addTable( $content, $table ) . "\n";
 135                 }
 136
 137                 // Page footer
 138                 if ( !$this->msg( 'pageinfo-footer' )->isDisabled() ) {
 139                         $content .= $this->msg( 'pageinfo-footer' )->parse();
 140                 }
 141
 142                 return $content;
 143         }
 144
 145         /**
 146          * Creates a header that can be added to the output.
 147          *
 148          * @param string $header The header text.
 149          * @return string The HTML.
 150          */
 151         protected function makeHeader( $header ) {
 152                 $spanAttribs = array( 'class' => 'mw-headline', 'id' => Sanitizer::escapeId( $header ) );
 153
 154                 return Html::rawElement( 'h2', array(), Html::element( 'span', $spanAttribs, $header ) );
 155         }
 156
 157         /**
 158          * Adds a row to a table that will be added to the content.
 159          *
 160          * @param string $table The table that will be added to the content
 161          * @param string $name The name of the row
 162          * @param string $value The value of the row
 163          * @param string $id The ID to use for the 'tr' element
 164          * @return string The table with the row added
 165          */
 166         protected function addRow( $table, $name, $value, $id ) {
 167                 return $table .
 168                         Html::rawElement(
 169                                 'tr',
 170                                 $id === null ? array() : array( 'id' => 'mw-' . $id ),
 171                                 Html::rawElement( 'td', array( 'style' => 'vertical-align: top;' ), $name ) .
 172                                         Html::rawElement( 'td', array(), $value )
 173                         );
 174         }
 175
 176         /**
 177          * Adds a table to the content that will be added to the output.
 178          *
 179          * @param string $content The content that will be added to the output
 180          * @param string $table The table
 181          * @return string The content with the table added
 182          */
 183         protected function addTable( $content, $table ) {
 184                 return $content . Html::rawElement( 'table', array( 'class' => 'wikitable mw-page-info' ),
 185                         $table );
 186         }
 187
 188         /**
 189          * Returns page information in an easily-manipulated format. Array keys are used so extensions
 190          * may add additional information in arbitrary positions. Array values are arrays with one
 191          * element to be rendered as a header, arrays with two elements to be rendered as a table row.
 192          *
 193          * @return array
 194          */
 195         protected function pageInfo() {
 196                 global $wgContLang;
 197
 198                 $user = $this->getUser();
 199                 $lang = $this->getLanguage();
 200                 $title = $this->getTitle();
 201                 $id = $title->getArticleID();
 202                 $config = $this->context->getConfig();
 203
 204                 $pageCounts = $this->pageCounts( $this->page );
 205
 206                 $pageProperties = array();
 207                 $props = PageProps::getInstance()->getAllProperties( $title );
 208                 if ( isset( $props[$id] ) ) {
 209                         $pageProperties = $props[$id];
 210                 }
 211
 212                 // Basic information
 213                 $pageInfo = array();
 214                 $pageInfo['header-basic'] = array();
 215
 216                 // Display title
 217                 $displayTitle = $title->getPrefixedText();
 218                 if ( isset( $pageProperties['displaytitle'] ) ) {
 219                         $displayTitle = $pageProperties['displaytitle'];
 220                 }
 221
 222                 $pageInfo['header-basic'][] = array(
 223                         $this->msg( 'pageinfo-display-title' ), $displayTitle
 224                 );
 225
 226                 // Is it a redirect? If so, where to?
 227                 if ( $title->isRedirect() ) {
 228                         $pageInfo['header-basic'][] = array(
 229                                 $this->msg( 'pageinfo-redirectsto' ),
 230                                 Linker::link( $this->page->getRedirectTarget() ) .
 231                                 $this->msg( 'word-separator' )->escaped() .
 232                                 $this->msg( 'parentheses' )->rawParams( Linker::link(
 233                                         $this->page->getRedirectTarget(),
 234                                         $this->msg( 'pageinfo-redirectsto-info' )->escaped(),
 235                                         array(),
 236                                         array( 'action' => 'info' )
 237                                 ) )->escaped()
 238                         );
 239                 }
 240
 241                 // Default sort key
 242                 $sortKey = $title->getCategorySortkey();
 243                 if ( isset( $pageProperties['defaultsort'] ) ) {
 244                         $sortKey = $pageProperties['defaultsort'];
 245                 }
 246
 247                 $sortKey = htmlspecialchars( $sortKey );
 248                 $pageInfo['header-basic'][] = array( $this->msg( 'pageinfo-default-sort' ), $sortKey );
 249
 250                 // Page length (in bytes)
 251                 $pageInfo['header-basic'][] = array(
 252                         $this->msg( 'pageinfo-length' ), $lang->formatNum( $title->getLength() )
 253                 );
 254
 255                 // Page ID (number not localised, as it's a database ID)
 256                 $pageInfo['header-basic'][] = array( $this->msg( 'pageinfo-article-id' ), $id );
 257
 258                 // Language in which the page content is (supposed to be) written
 259                 $pageLang = $title->getPageLanguage()->getCode();
 260
 261                 if ( $config->get( 'PageLanguageUseDB' )
 262                         && $this->getTitle()->userCan( 'pagelang', $this->getUser() )
 263                 ) {
 264                         // Link to Special:PageLanguage with pre-filled page title if user has permissions
 265                         $titleObj = SpecialPage::getTitleFor( 'PageLanguage', $title->getPrefixedText() );
 266                         $langDisp = Linker::link(
 267                                 $titleObj,
 268                                 $this->msg( 'pageinfo-language' )->escaped()
 269                         );
 270                 } else {
 271                         // Display just the message
 272                         $langDisp = $this->msg( 'pageinfo-language' )->escaped();
 273                 }
 274
 275                 $pageInfo['header-basic'][] = array( $langDisp,
 276                         Language::fetchLanguageName( $pageLang, $lang->getCode() )
 277                         . ' ' . $this->msg( 'parentheses', $pageLang )->escaped() );
 278
 279                 // Content model of the page
 280                 $pageInfo['header-basic'][] = array(
 281                         $this->msg( 'pageinfo-content-model' ),
 282                         htmlspecialchars( ContentHandler::getLocalizedName( $title->getContentModel() ) )
 283                 );
 284
 285                 // Search engine status
 286                 $pOutput = new ParserOutput();
 287                 if ( isset( $pageProperties['noindex'] ) ) {
 288                         $pOutput->setIndexPolicy( 'noindex' );
 289                 }
 290                 if ( isset( $pageProperties['index'] ) ) {
 291                         $pOutput->setIndexPolicy( 'index' );
 292                 }
 293
 294                 // Use robot policy logic
 295                 $policy = $this->page->getRobotPolicy( 'view', $pOutput );
 296                 $pageInfo['header-basic'][] = array(
 297                         // Messages: pageinfo-robot-index, pageinfo-robot-noindex
 298                         $this->msg( 'pageinfo-robot-policy' ),
 299                         $this->msg( "pageinfo-robot-${policy['index']}" )
 300                 );
 301
 302                 $unwatchedPageThreshold = $config->get( 'UnwatchedPageThreshold' );
 303                 if (
 304                         $user->isAllowed( 'unwatchedpages' ) ||
 305                         ( $unwatchedPageThreshold !== false &&
 306                                 $pageCounts['watchers'] >= $unwatchedPageThreshold )
 307                 ) {
 308                         // Number of page watchers
 309                         $pageInfo['header-basic'][] = array(
 310                                 $this->msg( 'pageinfo-watchers' ),
 311                                 $lang->formatNum( $pageCounts['watchers'] )
 312                         );
 313                         if (
 314                                 $config->get( 'ShowUpdatedMarker' ) &&
 315                                 isset( $pageCounts['visitingWatchers'] )
 316                         ) {
 317                                 $minToDisclose = $config->get( 'UnwatchedPageSecret' );
 318                                 if ( $pageCounts['visitingWatchers'] > $minToDisclose ||
 319                                         $user->isAllowed( 'unwatchedpages' ) ) {
 320                                         $pageInfo['header-basic'][] = array(
 321                                                 $this->msg( 'pageinfo-visiting-watchers' ),
 322                                                 $lang->formatNum( $pageCounts['visitingWatchers'] )
 323                                         );
 324                                 } else {
 325                                         $pageInfo['header-basic'][] = array(
 326                                                 $this->msg( 'pageinfo-visiting-watchers' ),
 327                                                 $this->msg( 'pageinfo-few-visiting-watchers' )
 328                                         );
 329                                 }
 330                         }
 331                 } elseif ( $unwatchedPageThreshold !== false ) {
 332                         $pageInfo['header-basic'][] = array(
 333                                 $this->msg( 'pageinfo-watchers' ),
 334                                 $this->msg( 'pageinfo-few-watchers' )->numParams( $unwatchedPageThreshold )
 335                         );
 336                 }
 337
 338                 // Redirects to this page
 339                 $whatLinksHere = SpecialPage::getTitleFor( 'Whatlinkshere', $title->getPrefixedText() );
 340                 $pageInfo['header-basic'][] = array(
 341                         Linker::link(
 342                                 $whatLinksHere,
 343                                 $this->msg( 'pageinfo-redirects-name' )->escaped(),
 344                                 array(),
 345                                 array(
 346                                         'hidelinks' => 1,
 347                                         'hidetrans' => 1,
 348                                         'hideimages' => $title->getNamespace() == NS_FILE
 349                                 )
 350                         ),
 351                         $this->msg( 'pageinfo-redirects-value' )
 352                                 ->numParams( count( $title->getRedirectsHere() ) )
 353                 );
 354
 355                 // Is it counted as a content page?
 356                 if ( $this->page->isCountable() ) {
 357                         $pageInfo['header-basic'][] = array(
 358                                 $this->msg( 'pageinfo-contentpage' ),
 359                                 $this->msg( 'pageinfo-contentpage-yes' )
 360                         );
 361                 }
 362
 363                 // Subpages of this page, if subpages are enabled for the current NS
 364                 if ( MWNamespace::hasSubpages( $title->getNamespace() ) ) {
 365                         $prefixIndex = SpecialPage::getTitleFor(
 366                                 'Prefixindex', $title->getPrefixedText() . '/' );
 367                         $pageInfo['header-basic'][] = array(
 368                                 Linker::link( $prefixIndex, $this->msg( 'pageinfo-subpages-name' )->escaped() ),
 369                                 $this->msg( 'pageinfo-subpages-value' )
 370                                         ->numParams(
 371                                                 $pageCounts['subpages']['total'],
 372                                                 $pageCounts['subpages']['redirects'],
 373                                                 $pageCounts['subpages']['nonredirects'] )
 374                         );
 375                 }
 376
 377                 if ( $title->inNamespace( NS_CATEGORY ) ) {
 378                         $category = Category::newFromTitle( $title );
 379
 380                         // $allCount is the total number of cat members,
 381                         // not the count of how many members are normal pages.
 382                         $allCount = (int)$category->getPageCount();
 383                         $subcatCount = (int)$category->getSubcatCount();
 384                         $fileCount = (int)$category->getFileCount();
 385                         $pagesCount = $allCount - $subcatCount - $fileCount;
 386
 387                         $pageInfo['category-info'] = array(
 388                                 array(
 389                                         $this->msg( 'pageinfo-category-total' ),
 390                                         $lang->formatNum( $allCount )
 391                                 ),
 392                                 array(
 393                                         $this->msg( 'pageinfo-category-pages' ),
 394                                         $lang->formatNum( $pagesCount )
 395                                 ),
 396                                 array(
 397                                         $this->msg( 'pageinfo-category-subcats' ),
 398                                         $lang->formatNum( $subcatCount )
 399                                 ),
 400                                 array(
 401                                         $this->msg( 'pageinfo-category-files' ),
 402                                         $lang->formatNum( $fileCount )
 403                                 )
 404                         );
 405                 }
 406
 407                 // Page protection
 408                 $pageInfo['header-restrictions'] = array();
 409
 410                 // Is this page affected by the cascading protection of something which includes it?
 411                 if ( $title->isCascadeProtected() ) {
 412                         $cascadingFrom = '';
 413                         $sources = $title->getCascadeProtectionSources()[0];
 414
 415                         foreach ( $sources as $sourceTitle ) {
 416                                 $cascadingFrom .= Html::rawElement(
 417                                         'li', array(), Linker::linkKnown( $sourceTitle ) );
 418                         }
 419
 420                         $cascadingFrom = Html::rawElement( 'ul', array(), $cascadingFrom );
 421                         $pageInfo['header-restrictions'][] = array(
 422                                 $this->msg( 'pageinfo-protect-cascading-from' ),
 423                                 $cascadingFrom
 424                         );
 425                 }
 426
 427                 // Is out protection set to cascade to other pages?
 428                 if ( $title->areRestrictionsCascading() ) {
 429                         $pageInfo['header-restrictions'][] = array(
 430                                 $this->msg( 'pageinfo-protect-cascading' ),
 431                                 $this->msg( 'pageinfo-protect-cascading-yes' )
 432                         );
 433                 }
 434
 435                 // Page protection
 436                 foreach ( $title->getRestrictionTypes() as $restrictionType ) {
 437                         $protectionLevel = implode( ', ', $title->getRestrictions( $restrictionType ) );
 438
 439                         if ( $protectionLevel == '' ) {
 440                                 // Allow all users
 441                                 $message = $this->msg( 'protect-default' )->escaped();
 442                         } else {
 443                                 // Administrators only
 444                                 // Messages: protect-level-autoconfirmed, protect-level-sysop
 445                                 $message = $this->msg( "protect-level-$protectionLevel" );
 446                                 if ( $message->isDisabled() ) {
 447                                         // Require "$1" permission
 448                                         $message = $this->msg( "protect-fallback", $protectionLevel )->parse();
 449                                 } else {
 450                                         $message = $message->escaped();
 451                                 }
 452                         }
 453                         $expiry = $title->getRestrictionExpiry( $restrictionType );
 454                         $formattedexpiry = $this->msg( 'parentheses',
 455                                 $this->getLanguage()->formatExpiry( $expiry ) )->escaped();
 456                         $message .= $this->msg( 'word-separator' )->escaped() . $formattedexpiry;
 457
 458                         // Messages: restriction-edit, restriction-move, restriction-create,
 459                         // restriction-upload
 460                         $pageInfo['header-restrictions'][] = array(
 461                                 $this->msg( "restriction-$restrictionType" ), $message
 462                         );
 463                 }
 464
 465                 if ( !$this->page->exists() ) {
 466                         return $pageInfo;
 467                 }
 468
 469                 // Edit history
 470                 $pageInfo['header-edits'] = array();
 471
 472                 $firstRev = $this->page->getOldestRevision();
 473                 $lastRev = $this->page->getRevision();
 474                 $batch = new LinkBatch;
 475
 476                 if ( $firstRev ) {
 477                         $firstRevUser = $firstRev->getUserText( Revision::FOR_THIS_USER );
 478                         if ( $firstRevUser !== '' ) {
 479                                 $batch->add( NS_USER, $firstRevUser );
 480                                 $batch->add( NS_USER_TALK, $firstRevUser );
 481                         }
 482                 }
 483
 484                 if ( $lastRev ) {
 485                         $lastRevUser = $lastRev->getUserText( Revision::FOR_THIS_USER );
 486                         if ( $lastRevUser !== '' ) {
 487                                 $batch->add( NS_USER, $lastRevUser );
 488                                 $batch->add( NS_USER_TALK, $lastRevUser );
 489                         }
 490                 }
 491
 492                 $batch->execute();
 493
 494                 if ( $firstRev ) {
 495                         // Page creator
 496                         $pageInfo['header-edits'][] = array(
 497                                 $this->msg( 'pageinfo-firstuser' ),
 498                                 Linker::revUserTools( $firstRev )
 499                         );
 500
 501                         // Date of page creation
 502                         $pageInfo['header-edits'][] = array(
 503                                 $this->msg( 'pageinfo-firsttime' ),
 504                                 Linker::linkKnown(
 505                                         $title,
 506                                         htmlspecialchars( $lang->userTimeAndDate( $firstRev->getTimestamp(), $user ) ),
 507                                         array(),
 508                                         array( 'oldid' => $firstRev->getId() )
 509                                 )
 510                         );
 511                 }
 512
 513                 if ( $lastRev ) {
 514                         // Latest editor
 515                         $pageInfo['header-edits'][] = array(
 516                                 $this->msg( 'pageinfo-lastuser' ),
 517                                 Linker::revUserTools( $lastRev )
 518                         );
 519
 520                         // Date of latest edit
 521                         $pageInfo['header-edits'][] = array(
 522                                 $this->msg( 'pageinfo-lasttime' ),
 523                                 Linker::linkKnown(
 524                                         $title,
 525                                         htmlspecialchars(
 526                                                 $lang->userTimeAndDate( $this->page->getTimestamp(), $user )
 527                                         ),
 528                                         array(),
 529                                         array( 'oldid' => $this->page->getLatest() )
 530                                 )
 531                         );
 532                 }
 533
 534                 // Total number of edits
 535                 $pageInfo['header-edits'][] = array(
 536                         $this->msg( 'pageinfo-edits' ), $lang->formatNum( $pageCounts['edits'] )
 537                 );
 538
 539                 // Total number of distinct authors
 540                 if ( $pageCounts['authors'] > 0 ) {
 541                         $pageInfo['header-edits'][] = array(
 542                                 $this->msg( 'pageinfo-authors' ), $lang->formatNum( $pageCounts['authors'] )
 543                         );
 544                 }
 545
 546                 // Recent number of edits (within past 30 days)
 547                 $pageInfo['header-edits'][] = array(
 548                         $this->msg( 'pageinfo-recent-edits',
 549                                 $lang->formatDuration( $config->get( 'RCMaxAge' ) ) ),
 550                         $lang->formatNum( $pageCounts['recent_edits'] )
 551                 );
 552
 553                 // Recent number of distinct authors
 554                 $pageInfo['header-edits'][] = array(
 555                         $this->msg( 'pageinfo-recent-authors' ),
 556                         $lang->formatNum( $pageCounts['recent_authors'] )
 557                 );
 558
 559                 // Array of MagicWord objects
 560                 $magicWords = MagicWord::getDoubleUnderscoreArray();
 561
 562                 // Array of magic word IDs
 563                 $wordIDs = $magicWords->names;
 564
 565                 // Array of IDs => localized magic words
 566                 $localizedWords = $wgContLang->getMagicWords();
 567
 568                 $listItems = array();
 569                 foreach ( $pageProperties as $property => $value ) {
 570                         if ( in_array( $property, $wordIDs ) ) {
 571                                 $listItems[] = Html::element( 'li', array(), $localizedWords[$property][1] );
 572                         }
 573                 }
 574
 575                 $localizedList = Html::rawElement( 'ul', array(), implode( '', $listItems ) );
 576                 $hiddenCategories = $this->page->getHiddenCategories();
 577
 578                 if (
 579                         count( $listItems ) > 0 ||
 580                         count( $hiddenCategories ) > 0 ||
 581                         $pageCounts['transclusion']['from'] > 0 ||
 582                         $pageCounts['transclusion']['to'] > 0
 583                 ) {
 584                         $options = array( 'LIMIT' => $config->get( 'PageInfoTransclusionLimit' ) );
 585                         $transcludedTemplates = $title->getTemplateLinksFrom( $options );
 586                         if ( $config->get( 'MiserMode' ) ) {
 587                                 $transcludedTargets = array();
 588                         } else {
 589                                 $transcludedTargets = $title->getTemplateLinksTo( $options );
 590                         }
 591
 592                         // Page properties
 593                         $pageInfo['header-properties'] = array();
 594
 595                         // Magic words
 596                         if ( count( $listItems ) > 0 ) {
 597                                 $pageInfo['header-properties'][] = array(
 598                                         $this->msg( 'pageinfo-magic-words' )->numParams( count( $listItems ) ),
 599                                         $localizedList
 600                                 );
 601                         }
 602
 603                         // Hidden categories
 604                         if ( count( $hiddenCategories ) > 0 ) {
 605                                 $pageInfo['header-properties'][] = array(
 606                                         $this->msg( 'pageinfo-hidden-categories' )
 607                                                 ->numParams( count( $hiddenCategories ) ),
 608                                         Linker::formatHiddenCategories( $hiddenCategories )
 609                                 );
 610                         }
 611
 612                         // Transcluded templates
 613                         if ( $pageCounts['transclusion']['from'] > 0 ) {
 614                                 if ( $pageCounts['transclusion']['from'] > count( $transcludedTemplates ) ) {
 615                                         $more = $this->msg( 'morenotlisted' )->escaped();
 616                                 } else {
 617                                         $more = null;
 618                                 }
 619
 620                                 $pageInfo['header-properties'][] = array(
 621                                         $this->msg( 'pageinfo-templates' )
 622                                                 ->numParams( $pageCounts['transclusion']['from'] ),
 623                                         Linker::formatTemplates(
 624                                                 $transcludedTemplates,
 625                                                 false,
 626                                                 false,
 627                                                 $more )
 628                                 );
 629                         }
 630
 631                         if ( !$config->get( 'MiserMode' ) && $pageCounts['transclusion']['to'] > 0 ) {
 632                                 if ( $pageCounts['transclusion']['to'] > count( $transcludedTargets ) ) {
 633                                         $more = Linker::link(
 634                                                 $whatLinksHere,
 635                                                 $this->msg( 'moredotdotdot' )->escaped(),
 636                                                 array(),
 637                                                 array( 'hidelinks' => 1, 'hideredirs' => 1 )
 638                                         );
 639                                 } else {
 640                                         $more = null;
 641                                 }
 642
 643                                 $pageInfo['header-properties'][] = array(
 644                                         $this->msg( 'pageinfo-transclusions' )
 645                                                 ->numParams( $pageCounts['transclusion']['to'] ),
 646                                         Linker::formatTemplates(
 647                                                 $transcludedTargets,
 648                                                 false,
 649                                                 false,
 650                                                 $more )
 651                                 );
 652                         }
 653                 }
 654
 655                 return $pageInfo;
 656         }
 657
 658         /**
 659          * Returns page counts that would be too "expensive" to retrieve by normal means.
 660          *
 661          * @param WikiPage|Article|Page $page
 662          * @return array
 663          */
 664         protected function pageCounts( Page $page ) {
 665                 $fname = __METHOD__;
 666                 $config = $this->context->getConfig();
 667
 668                 return ObjectCache::getMainWANInstance()->getWithSetCallback(
 669                         self::getCacheKey( $page->getTitle(), $page->getLatest() ),
 670                         86400 * 7,
 671                         function ( $oldValue, &$ttl, &$setOpts ) use ( $page, $config, $fname ) {
 672                                 $title = $page->getTitle();
 673                                 $id = $title->getArticleID();
 674
 675                                 $dbr = wfGetDB( DB_SLAVE );
 676                                 $dbrWatchlist = wfGetDB( DB_SLAVE, 'watchlist' );
 677
 678                                 $setOpts += Database::getCacheSetOptions( $dbr, $dbrWatchlist );
 679
 680                                 $result = array();
 681
 682                                 // Number of page watchers
 683                                 $watchers = (int)$dbrWatchlist->selectField(
 684                                         'watchlist',
 685                                         'COUNT(*)',
 686                                         array(
 687                                                 'wl_namespace' => $title->getNamespace(),
 688                                                 'wl_title' => $title->getDBkey(),
 689                                         ),
 690                                         $fname
 691                                 );
 692                                 $result['watchers'] = $watchers;
 693
 694                                 if ( $config->get( 'ShowUpdatedMarker' ) ) {
 695                                         // Threshold: last visited about 26 weeks before latest edit
 696                                         $updated = wfTimestamp( TS_UNIX, $page->getTimestamp() );
 697                                         $age = $config->get( 'WatchersMaxAge' );
 698                                         $threshold = $dbrWatchlist->timestamp( $updated - $age );
 699                                         // Number of page watchers who also visited a "recent" edit
 700                                         $visitingWatchers = (int)$dbrWatchlist->selectField(
 701                                                 'watchlist',
 702                                                 'COUNT(*)',
 703                                                 array(
 704                                                         'wl_namespace' => $title->getNamespace(),
 705                                                         'wl_title' => $title->getDBkey(),
 706                                                         'wl_notificationtimestamp >= ' .
 707                                                                 $dbrWatchlist->addQuotes( $threshold ) .
 708                                                                 ' OR wl_notificationtimestamp IS NULL'
 709                                                 ),
 710                                                 $fname
 711                                         );
 712                                         $result['visitingWatchers'] = $visitingWatchers;
 713                                 }
 714
 715                                 // Total number of edits
 716                                 $edits = (int)$dbr->selectField(
 717                                         'revision',
 718                                         'COUNT(*)',
 719                                         array( 'rev_page' => $id ),
 720                                         $fname
 721                                 );
 722                                 $result['edits'] = $edits;
 723
 724                                 // Total number of distinct authors
 725                                 if ( $config->get( 'MiserMode' ) ) {
 726                                         $result['authors'] = 0;
 727                                 } else {
 728                                         $result['authors'] = (int)$dbr->selectField(
 729                                                 'revision',
 730                                                 'COUNT(DISTINCT rev_user_text)',
 731                                                 array( 'rev_page' => $id ),
 732                                                 $fname
 733                                         );
 734                                 }
 735
 736                                 // "Recent" threshold defined by RCMaxAge setting
 737                                 $threshold = $dbr->timestamp( time() - $config->get( 'RCMaxAge' ) );
 738
 739                                 // Recent number of edits
 740                                 $edits = (int)$dbr->selectField(
 741                                         'revision',
 742                                         'COUNT(rev_page)',
 743                                         array(
 744                                                 'rev_page' => $id,
 745                                                 "rev_timestamp >= " . $dbr->addQuotes( $threshold )
 746                                         ),
 747                                         $fname
 748                                 );
 749                                 $result['recent_edits'] = $edits;
 750
 751                                 // Recent number of distinct authors
 752                                 $result['recent_authors'] = (int)$dbr->selectField(
 753                                         'revision',
 754                                         'COUNT(DISTINCT rev_user_text)',
 755                                         array(
 756                                                 'rev_page' => $id,
 757                                                 "rev_timestamp >= " . $dbr->addQuotes( $threshold )
 758                                         ),
 759                                         $fname
 760                                 );
 761
 762                                 // Subpages (if enabled)
 763                                 if ( MWNamespace::hasSubpages( $title->getNamespace() ) ) {
 764                                         $conds = array( 'page_namespace' => $title->getNamespace() );
 765                                         $conds[] = 'page_title ' .
 766                                                 $dbr->buildLike( $title->getDBkey() . '/', $dbr->anyString() );
 767
 768                                         // Subpages of this page (redirects)
 769                                         $conds['page_is_redirect'] = 1;
 770                                         $result['subpages']['redirects'] = (int)$dbr->selectField(
 771                                                 'page',
 772                                                 'COUNT(page_id)',
 773                                                 $conds,
 774                                                 $fname
 775                                         );
 776
 777                                         // Subpages of this page (non-redirects)
 778                                         $conds['page_is_redirect'] = 0;
 779                                         $result['subpages']['nonredirects'] = (int)$dbr->selectField(
 780                                                 'page',
 781                                                 'COUNT(page_id)',
 782                                                 $conds,
 783                                                 $fname
 784                                         );
 785
 786                                         // Subpages of this page (total)
 787                                         $result['subpages']['total'] = $result['subpages']['redirects']
 788                                                 + $result['subpages']['nonredirects'];
 789                                 }
 790
 791                                 // Counts for the number of transclusion links (to/from)
 792                                 if ( $config->get( 'MiserMode' ) ) {
 793                                         $result['transclusion']['to'] = 0;
 794                                 } else {
 795                                         $result['transclusion']['to'] = (int)$dbr->selectField(
 796                                                 'templatelinks',
 797                                                 'COUNT(tl_from)',
 798                                                 array(
 799                                                         'tl_namespace' => $title->getNamespace(),
 800                                                         'tl_title' => $title->getDBkey()
 801                                                 ),
 802                                                 $fname
 803                                         );
 804                                 }
 805
 806                                 $result['transclusion']['from'] = (int)$dbr->selectField(
 807                                         'templatelinks',
 808                                         'COUNT(*)',
 809                                         array( 'tl_from' => $title->getArticleID() ),
 810                                         $fname
 811                                 );
 812
 813                                 return $result;
 814                         }
 815                 );
 816         }
 817
 818         /**
 819          * Returns the name that goes in the "<h1>" page title.
 820          *
 821          * @return string
 822          */
 823         protected function getPageTitle() {
 824                 return $this->msg( 'pageinfo-title', $this->getTitle()->getPrefixedText() )->text();
 825         }
 826
 827         /**
 828          * Get a list of contributors of $article
 829          * @return string Html
 830          */
 831         protected function getContributors() {
 832                 $contributors = $this->page->getContributors();
 833                 $real_names = array();
 834                 $user_names = array();
 835                 $anon_ips = array();
 836
 837                 # Sift for real versus user names
 838                 /** @var $user User */
 839                 foreach ( $contributors as $user ) {
 840                         $page = $user->isAnon()
 841                                 ? SpecialPage::getTitleFor( 'Contributions', $user->getName() )
 842                                 : $user->getUserPage();
 843
 844                         $hiddenPrefs = $this->context->getConfig()->get( 'HiddenPrefs' );
 845                         if ( $user->getID() == 0 ) {
 846                                 $anon_ips[] = Linker::link( $page, htmlspecialchars( $user->getName() ) );
 847                         } elseif ( !in_array( 'realname', $hiddenPrefs ) && $user->getRealName() ) {
 848                                 $real_names[] = Linker::link( $page, htmlspecialchars( $user->getRealName() ) );
 849                         } else {
 850                                 $user_names[] = Linker::link( $page, htmlspecialchars( $user->getName() ) );
 851                         }
 852                 }
 853
 854                 $lang = $this->getLanguage();
 855
 856                 $real = $lang->listToText( $real_names );
 857
 858                 # "ThisSite user(s) A, B and C"
 859                 if ( count( $user_names ) ) {
 860                         $user = $this->msg( 'siteusers' )
 861                                 ->rawParams( $lang->listToText( $user_names ) )
 862                                 ->params( count( $user_names ) )->escaped();
 863                 } else {
 864                         $user = false;
 865                 }
 866
 867                 if ( count( $anon_ips ) ) {
 868                         $anon = $this->msg( 'anonusers' )
 869                                 ->rawParams( $lang->listToText( $anon_ips ) )
 870                                 ->params( count( $anon_ips ) )->escaped();
 871                 } else {
 872                         $anon = false;
 873                 }
 874
 875                 # This is the big list, all mooshed together. We sift for blank strings
 876                 $fulllist = array();
 877                 foreach ( array( $real, $user, $anon ) as $s ) {
 878                         if ( $s !== '' ) {
 879                                 array_push( $fulllist, $s );
 880                         }
 881                 }
 882
 883                 $count = count( $fulllist );
 884
 885                 # "Based on work by ..."
 886                 return $count
 887                         ? $this->msg( 'othercontribs' )->rawParams(
 888                                 $lang->listToText( $fulllist ) )->params( $count )->escaped()
 889                         : '';
 890         }
 891
 892         /**
 893          * Returns the description that goes below the "<h1>" tag.
 894          *
 895          * @return string
 896          */
 897         protected function getDescription() {
 898                 return '';
 899         }
 900
 901         /**
 902          * @param Title $title
 903          * @param int $revId
 904          * @return string
 905          */
 906         protected static function getCacheKey( Title $title, $revId ) {
 907                 return wfMemcKey( 'infoaction', md5( $title->getPrefixedText() ), $revId, self::VERSION );
 908         }
 909 }