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 use MediaWiki\MediaWikiServices;
  26
  27 /**
  28  * Displays information about a page.
  29  *
  30  * @ingroup Actions
  31  */
  32 class InfoAction extends FormlessAction {
  33         const VERSION = 1;
  34
  35         /**
  36          * Returns the name of the action this object responds to.
  37          *
  38          * @return string Lowercase name
  39          */
  40         public function getName() {
  41                 return 'info';
  42         }
  43
  44         /**
  45          * Whether this action can still be executed by a blocked user.
  46          *
  47          * @return bool
  48          */
  49         public function requiresUnblock() {
  50                 return false;
  51         }
  52
  53         /**
  54          * Whether this action requires the wiki not to be locked.
  55          *
  56          * @return bool
  57          */
  58         public function requiresWrite() {
  59                 return false;
  60         }
  61
  62         /**
  63          * Clear the info cache for a given Title.
  64          *
  65          * @since 1.22
  66          * @param Title $title Title to clear cache for
  67          * @param int|null $revid Revision id to clear
  68          */
  69         public static function invalidateCache( Title $title, $revid = null ) {
  70                 if ( !$revid ) {
  71                         $revision = Revision::newFromTitle( $title, 0, Revision::READ_LATEST );
  72                         $revid = $revision ? $revision->getId() : null;
  73                 }
  74                 if ( $revid !== null ) {
  75                         $key = self::getCacheKey( $title, $revid );
  76                         ObjectCache::getMainWANInstance()->delete( $key );
  77                 }
  78         }
  79
  80         /**
  81          * Shows page information on GET request.
  82          *
  83          * @return string Page information that will be added to the output
  84          */
  85         public function onView() {
  86                 $content = '';
  87
  88                 // Validate revision
  89                 $oldid = $this->page->getOldID();
  90                 if ( $oldid ) {
  91                         $revision = $this->page->getRevisionFetched();
  92
  93                         // Revision is missing
  94                         if ( $revision === null ) {
  95                                 return $this->msg( 'missing-revision', $oldid )->parse();
  96                         }
  97
  98                         // Revision is not current
  99                         if ( !$revision->isCurrent() ) {
 100                                 return $this->msg( 'pageinfo-not-current' )->plain();
 101                         }
 102                 }
 103
 104                 // Page header
 105                 if ( !$this->msg( 'pageinfo-header' )->isDisabled() ) {
 106                         $content .= $this->msg( 'pageinfo-header' )->parse();
 107                 }
 108
 109                 // Hide "This page is a member of # hidden categories" explanation
 110                 $content .= Html::element( 'style', [],
 111                         '.mw-hiddenCategoriesExplanation { display: none; }' ) . "\n";
 112
 113                 // Hide "Templates used on this page" explanation
 114                 $content .= Html::element( 'style', [],
 115                         '.mw-templatesUsedExplanation { display: none; }' ) . "\n";
 116
 117                 // Get page information
 118                 $pageInfo = $this->pageInfo();
 119
 120                 // Allow extensions to add additional information
 121                 Hooks::run( 'InfoAction', [ $this->getContext(), &$pageInfo ] );
 122
 123                 // Render page information
 124                 foreach ( $pageInfo as $header => $infoTable ) {
 125                         // Messages:
 126                         // pageinfo-header-basic, pageinfo-header-edits, pageinfo-header-restrictions,
 127                         // pageinfo-header-properties, pageinfo-category-info
 128                         $content .= $this->makeHeader( $this->msg( "pageinfo-${header}" )->escaped() ) . "\n";
 129                         $table = "\n";
 130                         foreach ( $infoTable as $infoRow ) {
 131                                 $name = ( $infoRow[0] instanceof Message ) ? $infoRow[0]->escaped() : $infoRow[0];
 132                                 $value = ( $infoRow[1] instanceof Message ) ? $infoRow[1]->escaped() : $infoRow[1];
 133                                 $id = ( $infoRow[0] instanceof Message ) ? $infoRow[0]->getKey() : null;
 134                                 $table = $this->addRow( $table, $name, $value, $id ) . "\n";
 135                         }
 136                         $content = $this->addTable( $content, $table ) . "\n";
 137                 }
 138
 139                 // Page footer
 140                 if ( !$this->msg( 'pageinfo-footer' )->isDisabled() ) {
 141                         $content .= $this->msg( 'pageinfo-footer' )->parse();
 142                 }
 143
 144                 return $content;
 145         }
 146
 147         /**
 148          * Creates a header that can be added to the output.
 149          *
 150          * @param string $header The header text.
 151          * @return string The HTML.
 152          */
 153         protected function makeHeader( $header ) {
 154                 $spanAttribs = [ 'class' => 'mw-headline', 'id' => Sanitizer::escapeId( $header ) ];
 155
 156                 return Html::rawElement( 'h2', [], Html::element( 'span', $spanAttribs, $header ) );
 157         }
 158
 159         /**
 160          * Adds a row to a table that will be added to the content.
 161          *
 162          * @param string $table The table that will be added to the content
 163          * @param string $name The name of the row
 164          * @param string $value The value of the row
 165          * @param string $id The ID to use for the 'tr' element
 166          * @return string The table with the row added
 167          */
 168         protected function addRow( $table, $name, $value, $id ) {
 169                 return $table .
 170                         Html::rawElement(
 171                                 'tr',
 172                                 $id === null ? [] : [ 'id' => 'mw-' . $id ],
 173                                 Html::rawElement( 'td', [ 'style' => 'vertical-align: top;' ], $name ) .
 174                                         Html::rawElement( 'td', [], $value )
 175                         );
 176         }
 177
 178         /**
 179          * Adds a table to the content that will be added to the output.
 180          *
 181          * @param string $content The content that will be added to the output
 182          * @param string $table The table
 183          * @return string The content with the table added
 184          */
 185         protected function addTable( $content, $table ) {
 186                 return $content . Html::rawElement( 'table', [ 'class' => 'wikitable mw-page-info' ],
 187                         $table );
 188         }
 189
 190         /**
 191          * Returns page information in an easily-manipulated format. Array keys are used so extensions
 192          * may add additional information in arbitrary positions. Array values are arrays with one
 193          * element to be rendered as a header, arrays with two elements to be rendered as a table row.
 194          *
 195          * @return array
 196          */
 197         protected function pageInfo() {
 198                 global $wgContLang;
 199
 200                 $user = $this->getUser();
 201                 $lang = $this->getLanguage();
 202                 $title = $this->getTitle();
 203                 $id = $title->getArticleID();
 204                 $config = $this->context->getConfig();
 205
 206                 $pageCounts = $this->pageCounts( $this->page );
 207
 208                 $pageProperties = [];
 209                 $props = PageProps::getInstance()->getAllProperties( $title );
 210                 if ( isset( $props[$id] ) ) {
 211                         $pageProperties = $props[$id];
 212                 }
 213
 214                 // Basic information
 215                 $pageInfo = [];
 216                 $pageInfo['header-basic'] = [];
 217
 218                 // Display title
 219                 $displayTitle = $title->getPrefixedText();
 220                 if ( isset( $pageProperties['displaytitle'] ) ) {
 221                         $displayTitle = $pageProperties['displaytitle'];
 222                 }
 223
 224                 $pageInfo['header-basic'][] = [
 225                         $this->msg( 'pageinfo-display-title' ), $displayTitle
 226                 ];
 227
 228                 // Is it a redirect? If so, where to?
 229                 if ( $title->isRedirect() ) {
 230                         $pageInfo['header-basic'][] = [
 231                                 $this->msg( 'pageinfo-redirectsto' ),
 232                                 Linker::link( $this->page->getRedirectTarget() ) .
 233                                 $this->msg( 'word-separator' )->escaped() .
 234                                 $this->msg( 'parentheses' )->rawParams( Linker::link(
 235                                         $this->page->getRedirectTarget(),
 236                                         $this->msg( 'pageinfo-redirectsto-info' )->escaped(),
 237                                         [],
 238                                         [ 'action' => 'info' ]
 239                                 ) )->escaped()
 240                         ];
 241                 }
 242
 243                 // Default sort key
 244                 $sortKey = $title->getCategorySortkey();
 245                 if ( isset( $pageProperties['defaultsort'] ) ) {
 246                         $sortKey = $pageProperties['defaultsort'];
 247                 }
 248
 249                 $sortKey = htmlspecialchars( $sortKey );
 250                 $pageInfo['header-basic'][] = [ $this->msg( 'pageinfo-default-sort' ), $sortKey ];
 251
 252                 // Page length (in bytes)
 253                 $pageInfo['header-basic'][] = [
 254                         $this->msg( 'pageinfo-length' ), $lang->formatNum( $title->getLength() )
 255                 ];
 256
 257                 // Page ID (number not localised, as it's a database ID)
 258                 $pageInfo['header-basic'][] = [ $this->msg( 'pageinfo-article-id' ), $id ];
 259
 260                 // Language in which the page content is (supposed to be) written
 261                 $pageLang = $title->getPageLanguage()->getCode();
 262
 263                 if ( $config->get( 'PageLanguageUseDB' )
 264                         && $this->getTitle()->userCan( 'pagelang', $this->getUser() )
 265                 ) {
 266                         // Link to Special:PageLanguage with pre-filled page title if user has permissions
 267                         $titleObj = SpecialPage::getTitleFor( 'PageLanguage', $title->getPrefixedText() );
 268                         $langDisp = Linker::link(
 269                                 $titleObj,
 270                                 $this->msg( 'pageinfo-language' )->escaped()
 271                         );
 272                 } else {
 273                         // Display just the message
 274                         $langDisp = $this->msg( 'pageinfo-language' )->escaped();
 275                 }
 276
 277                 $pageInfo['header-basic'][] = [ $langDisp,
 278                         Language::fetchLanguageName( $pageLang, $lang->getCode() )
 279                         . ' ' . $this->msg( 'parentheses', $pageLang )->escaped() ];
 280
 281                 // Content model of the page
 282                 $pageInfo['header-basic'][] = [
 283                         $this->msg( 'pageinfo-content-model' ),
 284                         htmlspecialchars( ContentHandler::getLocalizedName( $title->getContentModel() ) )
 285                 ];
 286
 287                 // Search engine status
 288                 $pOutput = new ParserOutput();
 289                 if ( isset( $pageProperties['noindex'] ) ) {
 290                         $pOutput->setIndexPolicy( 'noindex' );
 291                 }
 292                 if ( isset( $pageProperties['index'] ) ) {
 293                         $pOutput->setIndexPolicy( 'index' );
 294                 }
 295
 296                 // Use robot policy logic
 297                 $policy = $this->page->getRobotPolicy( 'view', $pOutput );
 298                 $pageInfo['header-basic'][] = [
 299                         // Messages: pageinfo-robot-index, pageinfo-robot-noindex
 300                         $this->msg( 'pageinfo-robot-policy' ),
 301                         $this->msg( "pageinfo-robot-${policy['index']}" )
 302                 ];
 303
 304                 $unwatchedPageThreshold = $config->get( 'UnwatchedPageThreshold' );
 305                 if (
 306                         $user->isAllowed( 'unwatchedpages' ) ||
 307                         ( $unwatchedPageThreshold !== false &&
 308                                 $pageCounts['watchers'] >= $unwatchedPageThreshold )
 309                 ) {
 310                         // Number of page watchers
 311                         $pageInfo['header-basic'][] = [
 312                                 $this->msg( 'pageinfo-watchers' ),
 313                                 $lang->formatNum( $pageCounts['watchers'] )
 314                         ];
 315                         if (
 316                                 $config->get( 'ShowUpdatedMarker' ) &&
 317                                 isset( $pageCounts['visitingWatchers'] )
 318                         ) {
 319                                 $minToDisclose = $config->get( 'UnwatchedPageSecret' );
 320                                 if ( $pageCounts['visitingWatchers'] > $minToDisclose ||
 321                                         $user->isAllowed( 'unwatchedpages' ) ) {
 322                                         $pageInfo['header-basic'][] = [
 323                                                 $this->msg( 'pageinfo-visiting-watchers' ),
 324                                                 $lang->formatNum( $pageCounts['visitingWatchers'] )
 325                                         ];
 326                                 } else {
 327                                         $pageInfo['header-basic'][] = [
 328                                                 $this->msg( 'pageinfo-visiting-watchers' ),
 329                                                 $this->msg( 'pageinfo-few-visiting-watchers' )
 330                                         ];
 331                                 }
 332                         }
 333                 } elseif ( $unwatchedPageThreshold !== false ) {
 334                         $pageInfo['header-basic'][] = [
 335                                 $this->msg( 'pageinfo-watchers' ),
 336                                 $this->msg( 'pageinfo-few-watchers' )->numParams( $unwatchedPageThreshold )
 337                         ];
 338                 }
 339
 340                 // Redirects to this page
 341                 $whatLinksHere = SpecialPage::getTitleFor( 'Whatlinkshere', $title->getPrefixedText() );
 342                 $pageInfo['header-basic'][] = [
 343                         Linker::link(
 344                                 $whatLinksHere,
 345                                 $this->msg( 'pageinfo-redirects-name' )->escaped(),
 346                                 [],
 347                                 [
 348                                         'hidelinks' => 1,
 349                                         'hidetrans' => 1,
 350                                         'hideimages' => $title->getNamespace() == NS_FILE
 351                                 ]
 352                         ),
 353                         $this->msg( 'pageinfo-redirects-value' )
 354                                 ->numParams( count( $title->getRedirectsHere() ) )
 355                 ];
 356
 357                 // Is it counted as a content page?
 358                 if ( $this->page->isCountable() ) {
 359                         $pageInfo['header-basic'][] = [
 360                                 $this->msg( 'pageinfo-contentpage' ),
 361                                 $this->msg( 'pageinfo-contentpage-yes' )
 362                         ];
 363                 }
 364
 365                 // Subpages of this page, if subpages are enabled for the current NS
 366                 if ( MWNamespace::hasSubpages( $title->getNamespace() ) ) {
 367                         $prefixIndex = SpecialPage::getTitleFor(
 368                                 'Prefixindex', $title->getPrefixedText() . '/' );
 369                         $pageInfo['header-basic'][] = [
 370                                 Linker::link( $prefixIndex, $this->msg( 'pageinfo-subpages-name' )->escaped() ),
 371                                 $this->msg( 'pageinfo-subpages-value' )
 372                                         ->numParams(
 373                                                 $pageCounts['subpages']['total'],
 374                                                 $pageCounts['subpages']['redirects'],
 375                                                 $pageCounts['subpages']['nonredirects'] )
 376                         ];
 377                 }
 378
 379                 if ( $title->inNamespace( NS_CATEGORY ) ) {
 380                         $category = Category::newFromTitle( $title );
 381
 382                         // $allCount is the total number of cat members,
 383                         // not the count of how many members are normal pages.
 384                         $allCount = (int)$category->getPageCount();
 385                         $subcatCount = (int)$category->getSubcatCount();
 386                         $fileCount = (int)$category->getFileCount();
 387                         $pagesCount = $allCount - $subcatCount - $fileCount;
 388
 389                         $pageInfo['category-info'] = [
 390                                 [
 391                                         $this->msg( 'pageinfo-category-total' ),
 392                                         $lang->formatNum( $allCount )
 393                                 ],
 394                                 [
 395                                         $this->msg( 'pageinfo-category-pages' ),
 396                                         $lang->formatNum( $pagesCount )
 397                                 ],
 398                                 [
 399                                         $this->msg( 'pageinfo-category-subcats' ),
 400                                         $lang->formatNum( $subcatCount )
 401                                 ],
 402                                 [
 403                                         $this->msg( 'pageinfo-category-files' ),
 404                                         $lang->formatNum( $fileCount )
 405                                 ]
 406                         ];
 407                 }
 408
 409                 // Page protection
 410                 $pageInfo['header-restrictions'] = [];
 411
 412                 // Is this page affected by the cascading protection of something which includes it?
 413                 if ( $title->isCascadeProtected() ) {
 414                         $cascadingFrom = '';
 415                         $sources = $title->getCascadeProtectionSources()[0];
 416
 417                         foreach ( $sources as $sourceTitle ) {
 418                                 $cascadingFrom .= Html::rawElement(
 419                                         'li', [], Linker::linkKnown( $sourceTitle ) );
 420                         }
 421
 422                         $cascadingFrom = Html::rawElement( 'ul', [], $cascadingFrom );
 423                         $pageInfo['header-restrictions'][] = [
 424                                 $this->msg( 'pageinfo-protect-cascading-from' ),
 425                                 $cascadingFrom
 426                         ];
 427                 }
 428
 429                 // Is out protection set to cascade to other pages?
 430                 if ( $title->areRestrictionsCascading() ) {
 431                         $pageInfo['header-restrictions'][] = [
 432                                 $this->msg( 'pageinfo-protect-cascading' ),
 433                                 $this->msg( 'pageinfo-protect-cascading-yes' )
 434                         ];
 435                 }
 436
 437                 // Page protection
 438                 foreach ( $title->getRestrictionTypes() as $restrictionType ) {
 439                         $protectionLevel = implode( ', ', $title->getRestrictions( $restrictionType ) );
 440
 441                         if ( $protectionLevel == '' ) {
 442                                 // Allow all users
 443                                 $message = $this->msg( 'protect-default' )->escaped();
 444                         } else {
 445                                 // Administrators only
 446                                 // Messages: protect-level-autoconfirmed, protect-level-sysop
 447                                 $message = $this->msg( "protect-level-$protectionLevel" );
 448                                 if ( $message->isDisabled() ) {
 449                                         // Require "$1" permission
 450                                         $message = $this->msg( "protect-fallback", $protectionLevel )->parse();
 451                                 } else {
 452                                         $message = $message->escaped();
 453                                 }
 454                         }
 455                         $expiry = $title->getRestrictionExpiry( $restrictionType );
 456                         $formattedexpiry = $this->msg( 'parentheses',
 457                                 $this->getLanguage()->formatExpiry( $expiry ) )->escaped();
 458                         $message .= $this->msg( 'word-separator' )->escaped() . $formattedexpiry;
 459
 460                         // Messages: restriction-edit, restriction-move, restriction-create,
 461                         // restriction-upload
 462                         $pageInfo['header-restrictions'][] = [
 463                                 $this->msg( "restriction-$restrictionType" ), $message
 464                         ];
 465                 }
 466
 467                 if ( !$this->page->exists() ) {
 468                         return $pageInfo;
 469                 }
 470
 471                 // Edit history
 472                 $pageInfo['header-edits'] = [];
 473
 474                 $firstRev = $this->page->getOldestRevision();
 475                 $lastRev = $this->page->getRevision();
 476                 $batch = new LinkBatch;
 477
 478                 if ( $firstRev ) {
 479                         $firstRevUser = $firstRev->getUserText( Revision::FOR_THIS_USER );
 480                         if ( $firstRevUser !== '' ) {
 481                                 $batch->add( NS_USER, $firstRevUser );
 482                                 $batch->add( NS_USER_TALK, $firstRevUser );
 483                         }
 484                 }
 485
 486                 if ( $lastRev ) {
 487                         $lastRevUser = $lastRev->getUserText( Revision::FOR_THIS_USER );
 488                         if ( $lastRevUser !== '' ) {
 489                                 $batch->add( NS_USER, $lastRevUser );
 490                                 $batch->add( NS_USER_TALK, $lastRevUser );
 491                         }
 492                 }
 493
 494                 $batch->execute();
 495
 496                 if ( $firstRev ) {
 497                         // Page creator
 498                         $pageInfo['header-edits'][] = [
 499                                 $this->msg( 'pageinfo-firstuser' ),
 500                                 Linker::revUserTools( $firstRev )
 501                         ];
 502
 503                         // Date of page creation
 504                         $pageInfo['header-edits'][] = [
 505                                 $this->msg( 'pageinfo-firsttime' ),
 506                                 Linker::linkKnown(
 507                                         $title,
 508                                         htmlspecialchars( $lang->userTimeAndDate( $firstRev->getTimestamp(), $user ) ),
 509                                         [],
 510                                         [ 'oldid' => $firstRev->getId() ]
 511                                 )
 512                         ];
 513                 }
 514
 515                 if ( $lastRev ) {
 516                         // Latest editor
 517                         $pageInfo['header-edits'][] = [
 518                                 $this->msg( 'pageinfo-lastuser' ),
 519                                 Linker::revUserTools( $lastRev )
 520                         ];
 521
 522                         // Date of latest edit
 523                         $pageInfo['header-edits'][] = [
 524                                 $this->msg( 'pageinfo-lasttime' ),
 525                                 Linker::linkKnown(
 526                                         $title,
 527                                         htmlspecialchars(
 528                                                 $lang->userTimeAndDate( $this->page->getTimestamp(), $user )
 529                                         ),
 530                                         [],
 531                                         [ 'oldid' => $this->page->getLatest() ]
 532                                 )
 533                         ];
 534                 }
 535
 536                 // Total number of edits
 537                 $pageInfo['header-edits'][] = [
 538                         $this->msg( 'pageinfo-edits' ), $lang->formatNum( $pageCounts['edits'] )
 539                 ];
 540
 541                 // Total number of distinct authors
 542                 if ( $pageCounts['authors'] > 0 ) {
 543                         $pageInfo['header-edits'][] = [
 544                                 $this->msg( 'pageinfo-authors' ), $lang->formatNum( $pageCounts['authors'] )
 545                         ];
 546                 }
 547
 548                 // Recent number of edits (within past 30 days)
 549                 $pageInfo['header-edits'][] = [
 550                         $this->msg( 'pageinfo-recent-edits',
 551                                 $lang->formatDuration( $config->get( 'RCMaxAge' ) ) ),
 552                         $lang->formatNum( $pageCounts['recent_edits'] )
 553                 ];
 554
 555                 // Recent number of distinct authors
 556                 $pageInfo['header-edits'][] = [
 557                         $this->msg( 'pageinfo-recent-authors' ),
 558                         $lang->formatNum( $pageCounts['recent_authors'] )
 559                 ];
 560
 561                 // Array of MagicWord objects
 562                 $magicWords = MagicWord::getDoubleUnderscoreArray();
 563
 564                 // Array of magic word IDs
 565                 $wordIDs = $magicWords->names;
 566
 567                 // Array of IDs => localized magic words
 568                 $localizedWords = $wgContLang->getMagicWords();
 569
 570                 $listItems = [];
 571                 foreach ( $pageProperties as $property => $value ) {
 572                         if ( in_array( $property, $wordIDs ) ) {
 573                                 $listItems[] = Html::element( 'li', [], $localizedWords[$property][1] );
 574                         }
 575                 }
 576
 577                 $localizedList = Html::rawElement( 'ul', [], implode( '', $listItems ) );
 578                 $hiddenCategories = $this->page->getHiddenCategories();
 579
 580                 if (
 581                         count( $listItems ) > 0 ||
 582                         count( $hiddenCategories ) > 0 ||
 583                         $pageCounts['transclusion']['from'] > 0 ||
 584                         $pageCounts['transclusion']['to'] > 0
 585                 ) {
 586                         $options = [ 'LIMIT' => $config->get( 'PageInfoTransclusionLimit' ) ];
 587                         $transcludedTemplates = $title->getTemplateLinksFrom( $options );
 588                         if ( $config->get( 'MiserMode' ) ) {
 589                                 $transcludedTargets = [];
 590                         } else {
 591                                 $transcludedTargets = $title->getTemplateLinksTo( $options );
 592                         }
 593
 594                         // Page properties
 595                         $pageInfo['header-properties'] = [];
 596
 597                         // Magic words
 598                         if ( count( $listItems ) > 0 ) {
 599                                 $pageInfo['header-properties'][] = [
 600                                         $this->msg( 'pageinfo-magic-words' )->numParams( count( $listItems ) ),
 601                                         $localizedList
 602                                 ];
 603                         }
 604
 605                         // Hidden categories
 606                         if ( count( $hiddenCategories ) > 0 ) {
 607                                 $pageInfo['header-properties'][] = [
 608                                         $this->msg( 'pageinfo-hidden-categories' )
 609                                                 ->numParams( count( $hiddenCategories ) ),
 610                                         Linker::formatHiddenCategories( $hiddenCategories )
 611                                 ];
 612                         }
 613
 614                         // Transcluded templates
 615                         if ( $pageCounts['transclusion']['from'] > 0 ) {
 616                                 if ( $pageCounts['transclusion']['from'] > count( $transcludedTemplates ) ) {
 617                                         $more = $this->msg( 'morenotlisted' )->escaped();
 618                                 } else {
 619                                         $more = null;
 620                                 }
 621
 622                                 $pageInfo['header-properties'][] = [
 623                                         $this->msg( 'pageinfo-templates' )
 624                                                 ->numParams( $pageCounts['transclusion']['from'] ),
 625                                         Linker::formatTemplates(
 626                                                 $transcludedTemplates,
 627                                                 false,
 628                                                 false,
 629                                                 $more )
 630                                 ];
 631                         }
 632
 633                         if ( !$config->get( 'MiserMode' ) && $pageCounts['transclusion']['to'] > 0 ) {
 634                                 if ( $pageCounts['transclusion']['to'] > count( $transcludedTargets ) ) {
 635                                         $more = Linker::link(
 636                                                 $whatLinksHere,
 637                                                 $this->msg( 'moredotdotdot' )->escaped(),
 638                                                 [],
 639                                                 [ 'hidelinks' => 1, 'hideredirs' => 1 ]
 640                                         );
 641                                 } else {
 642                                         $more = null;
 643                                 }
 644
 645                                 $pageInfo['header-properties'][] = [
 646                                         $this->msg( 'pageinfo-transclusions' )
 647                                                 ->numParams( $pageCounts['transclusion']['to'] ),
 648                                         Linker::formatTemplates(
 649                                                 $transcludedTargets,
 650                                                 false,
 651                                                 false,
 652                                                 $more )
 653                                 ];
 654                         }
 655                 }
 656
 657                 return $pageInfo;
 658         }
 659
 660         /**
 661          * Returns page counts that would be too "expensive" to retrieve by normal means.
 662          *
 663          * @param WikiPage|Article|Page $page
 664          * @return array
 665          */
 666         protected function pageCounts( Page $page ) {
 667                 $fname = __METHOD__;
 668                 $config = $this->context->getConfig();
 669
 670                 return ObjectCache::getMainWANInstance()->getWithSetCallback(
 671                         self::getCacheKey( $page->getTitle(), $page->getLatest() ),
 672                         86400 * 7,
 673                         function ( $oldValue, &$ttl, &$setOpts ) use ( $page, $config, $fname ) {
 674                                 $title = $page->getTitle();
 675                                 $id = $title->getArticleID();
 676
 677                                 $dbr = wfGetDB( DB_SLAVE );
 678                                 $dbrWatchlist = wfGetDB( DB_SLAVE, 'watchlist' );
 679
 680                                 $setOpts += Database::getCacheSetOptions( $dbr, $dbrWatchlist );
 681
 682                                 $watchedItemStore = MediaWikiServices::getInstance()->getWatchedItemStore();
 683
 684                                 $result = [];
 685                                 $result['watchers'] = $watchedItemStore->countWatchers( $title );
 686
 687                                 if ( $config->get( 'ShowUpdatedMarker' ) ) {
 688                                         $updated = wfTimestamp( TS_UNIX, $page->getTimestamp() );
 689                                         $result['visitingWatchers'] = $watchedItemStore->countVisitingWatchers(
 690                                                 $title,
 691                                                 $updated - $config->get( 'WatchersMaxAge' )
 692                                         );
 693                                 }
 694
 695                                 // Total number of edits
 696                                 $edits = (int)$dbr->selectField(
 697                                         'revision',
 698                                         'COUNT(*)',
 699                                         [ 'rev_page' => $id ],
 700                                         $fname
 701                                 );
 702                                 $result['edits'] = $edits;
 703
 704                                 // Total number of distinct authors
 705                                 if ( $config->get( 'MiserMode' ) ) {
 706                                         $result['authors'] = 0;
 707                                 } else {
 708                                         $result['authors'] = (int)$dbr->selectField(
 709                                                 'revision',
 710                                                 'COUNT(DISTINCT rev_user_text)',
 711                                                 [ 'rev_page' => $id ],
 712                                                 $fname
 713                                         );
 714                                 }
 715
 716                                 // "Recent" threshold defined by RCMaxAge setting
 717                                 $threshold = $dbr->timestamp( time() - $config->get( 'RCMaxAge' ) );
 718
 719                                 // Recent number of edits
 720                                 $edits = (int)$dbr->selectField(
 721                                         'revision',
 722                                         'COUNT(rev_page)',
 723                                         [
 724                                                 'rev_page' => $id,
 725                                                 "rev_timestamp >= " . $dbr->addQuotes( $threshold )
 726                                         ],
 727                                         $fname
 728                                 );
 729                                 $result['recent_edits'] = $edits;
 730
 731                                 // Recent number of distinct authors
 732                                 $result['recent_authors'] = (int)$dbr->selectField(
 733                                         'revision',
 734                                         'COUNT(DISTINCT rev_user_text)',
 735                                         [
 736                                                 'rev_page' => $id,
 737                                                 "rev_timestamp >= " . $dbr->addQuotes( $threshold )
 738                                         ],
 739                                         $fname
 740                                 );
 741
 742                                 // Subpages (if enabled)
 743                                 if ( MWNamespace::hasSubpages( $title->getNamespace() ) ) {
 744                                         $conds = [ 'page_namespace' => $title->getNamespace() ];
 745                                         $conds[] = 'page_title ' .
 746                                                 $dbr->buildLike( $title->getDBkey() . '/', $dbr->anyString() );
 747
 748                                         // Subpages of this page (redirects)
 749                                         $conds['page_is_redirect'] = 1;
 750                                         $result['subpages']['redirects'] = (int)$dbr->selectField(
 751                                                 'page',
 752                                                 'COUNT(page_id)',
 753                                                 $conds,
 754                                                 $fname
 755                                         );
 756
 757                                         // Subpages of this page (non-redirects)
 758                                         $conds['page_is_redirect'] = 0;
 759                                         $result['subpages']['nonredirects'] = (int)$dbr->selectField(
 760                                                 'page',
 761                                                 'COUNT(page_id)',
 762                                                 $conds,
 763                                                 $fname
 764                                         );
 765
 766                                         // Subpages of this page (total)
 767                                         $result['subpages']['total'] = $result['subpages']['redirects']
 768                                                 + $result['subpages']['nonredirects'];
 769                                 }
 770
 771                                 // Counts for the number of transclusion links (to/from)
 772                                 if ( $config->get( 'MiserMode' ) ) {
 773                                         $result['transclusion']['to'] = 0;
 774                                 } else {
 775                                         $result['transclusion']['to'] = (int)$dbr->selectField(
 776                                                 'templatelinks',
 777                                                 'COUNT(tl_from)',
 778                                                 [
 779                                                         'tl_namespace' => $title->getNamespace(),
 780                                                         'tl_title' => $title->getDBkey()
 781                                                 ],
 782                                                 $fname
 783                                         );
 784                                 }
 785
 786                                 $result['transclusion']['from'] = (int)$dbr->selectField(
 787                                         'templatelinks',
 788                                         'COUNT(*)',
 789                                         [ 'tl_from' => $title->getArticleID() ],
 790                                         $fname
 791                                 );
 792
 793                                 return $result;
 794                         }
 795                 );
 796         }
 797
 798         /**
 799          * Returns the name that goes in the "<h1>" page title.
 800          *
 801          * @return string
 802          */
 803         protected function getPageTitle() {
 804                 return $this->msg( 'pageinfo-title', $this->getTitle()->getPrefixedText() )->text();
 805         }
 806
 807         /**
 808          * Get a list of contributors of $article
 809          * @return string Html
 810          */
 811         protected function getContributors() {
 812                 $contributors = $this->page->getContributors();
 813                 $real_names = [];
 814                 $user_names = [];
 815                 $anon_ips = [];
 816
 817                 # Sift for real versus user names
 818                 /** @var $user User */
 819                 foreach ( $contributors as $user ) {
 820                         $page = $user->isAnon()
 821                                 ? SpecialPage::getTitleFor( 'Contributions', $user->getName() )
 822                                 : $user->getUserPage();
 823
 824                         $hiddenPrefs = $this->context->getConfig()->get( 'HiddenPrefs' );
 825                         if ( $user->getId() == 0 ) {
 826                                 $anon_ips[] = Linker::link( $page, htmlspecialchars( $user->getName() ) );
 827                         } elseif ( !in_array( 'realname', $hiddenPrefs ) && $user->getRealName() ) {
 828                                 $real_names[] = Linker::link( $page, htmlspecialchars( $user->getRealName() ) );
 829                         } else {
 830                                 $user_names[] = Linker::link( $page, htmlspecialchars( $user->getName() ) );
 831                         }
 832                 }
 833
 834                 $lang = $this->getLanguage();
 835
 836                 $real = $lang->listToText( $real_names );
 837
 838                 # "ThisSite user(s) A, B and C"
 839                 if ( count( $user_names ) ) {
 840                         $user = $this->msg( 'siteusers' )
 841                                 ->rawParams( $lang->listToText( $user_names ) )
 842                                 ->params( count( $user_names ) )->escaped();
 843                 } else {
 844                         $user = false;
 845                 }
 846
 847                 if ( count( $anon_ips ) ) {
 848                         $anon = $this->msg( 'anonusers' )
 849                                 ->rawParams( $lang->listToText( $anon_ips ) )
 850                                 ->params( count( $anon_ips ) )->escaped();
 851                 } else {
 852                         $anon = false;
 853                 }
 854
 855                 # This is the big list, all mooshed together. We sift for blank strings
 856                 $fulllist = [];
 857                 foreach ( [ $real, $user, $anon ] as $s ) {
 858                         if ( $s !== '' ) {
 859                                 array_push( $fulllist, $s );
 860                         }
 861                 }
 862
 863                 $count = count( $fulllist );
 864
 865                 # "Based on work by ..."
 866                 return $count
 867                         ? $this->msg( 'othercontribs' )->rawParams(
 868                                 $lang->listToText( $fulllist ) )->params( $count )->escaped()
 869                         : '';
 870         }
 871
 872         /**
 873          * Returns the description that goes below the "<h1>" tag.
 874          *
 875          * @return string
 876          */
 877         protected function getDescription() {
 878                 return '';
 879         }
 880
 881         /**
 882          * @param Title $title
 883          * @param int $revId
 884          * @return string
 885          */
 886         protected static function getCacheKey( Title $title, $revId ) {
 887                 return wfMemcKey( 'infoaction', md5( $title->getPrefixedText() ), $revId, self::VERSION );
 888         }
 889 }