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                 $linkRenderer = MediaWikiServices::getInstance()->getLinkRenderer();
 206
 207                 $pageCounts = $this->pageCounts( $this->page );
 208
 209                 $pageProperties = [];
 210                 $props = PageProps::getInstance()->getAllProperties( $title );
 211                 if ( isset( $props[$id] ) ) {
 212                         $pageProperties = $props[$id];
 213                 }
 214
 215                 // Basic information
 216                 $pageInfo = [];
 217                 $pageInfo['header-basic'] = [];
 218
 219                 // Display title
 220                 $displayTitle = $title->getPrefixedText();
 221                 if ( isset( $pageProperties['displaytitle'] ) ) {
 222                         $displayTitle = $pageProperties['displaytitle'];
 223                 }
 224
 225                 $pageInfo['header-basic'][] = [
 226                         $this->msg( 'pageinfo-display-title' ), $displayTitle
 227                 ];
 228
 229                 // Is it a redirect? If so, where to?
 230                 if ( $title->isRedirect() ) {
 231                         $pageInfo['header-basic'][] = [
 232                                 $this->msg( 'pageinfo-redirectsto' ),
 233                                 $linkRenderer->makeLink( $this->page->getRedirectTarget() ) .
 234                                 $this->msg( 'word-separator' )->escaped() .
 235                                 $this->msg( 'parentheses' )->rawParams( $linkRenderer->makeLink(
 236                                         $this->page->getRedirectTarget(),
 237                                         $this->msg( 'pageinfo-redirectsto-info' )->text(),
 238                                         [],
 239                                         [ 'action' => 'info' ]
 240                                 ) )->escaped()
 241                         ];
 242                 }
 243
 244                 // Default sort key
 245                 $sortKey = $title->getCategorySortkey();
 246                 if ( isset( $pageProperties['defaultsort'] ) ) {
 247                         $sortKey = $pageProperties['defaultsort'];
 248                 }
 249
 250                 $sortKey = htmlspecialchars( $sortKey );
 251                 $pageInfo['header-basic'][] = [ $this->msg( 'pageinfo-default-sort' ), $sortKey ];
 252
 253                 // Page length (in bytes)
 254                 $pageInfo['header-basic'][] = [
 255                         $this->msg( 'pageinfo-length' ), $lang->formatNum( $title->getLength() )
 256                 ];
 257
 258                 // Page ID (number not localised, as it's a database ID)
 259                 $pageInfo['header-basic'][] = [ $this->msg( 'pageinfo-article-id' ), $id ];
 260
 261                 // Language in which the page content is (supposed to be) written
 262                 $pageLang = $title->getPageLanguage()->getCode();
 263
 264                 if ( $config->get( 'PageLanguageUseDB' )
 265                         && $title->userCan( 'pagelang', $user )
 266                 ) {
 267                         // Link to Special:PageLanguage with pre-filled page title if user has permissions
 268                         $titleObj = SpecialPage::getTitleFor( 'PageLanguage', $title->getPrefixedText() );
 269                         $langDisp = $linkRenderer->makeLink(
 270                                 $titleObj,
 271                                 $this->msg( 'pageinfo-language' )->text()
 272                         );
 273                 } else {
 274                         // Display just the message
 275                         $langDisp = $this->msg( 'pageinfo-language' )->escaped();
 276                 }
 277
 278                 $pageInfo['header-basic'][] = [ $langDisp,
 279                         Language::fetchLanguageName( $pageLang, $lang->getCode() )
 280                         . ' ' . $this->msg( 'parentheses', $pageLang )->escaped() ];
 281
 282                 // Content model of the page
 283                 $modelHtml = htmlspecialchars( ContentHandler::getLocalizedName( $title->getContentModel() ) );
 284                 // If the user can change it, add a link to Special:ChangeContentModel
 285                 if ( $config->get( 'ContentHandlerUseDB' )
 286                         && $title->userCan( 'editcontentmodel', $user )
 287                 ) {
 288                         $modelHtml .= ' ' . $this->msg( 'parentheses' )->rawParams( $linkRenderer->makeLink(
 289                                 SpecialPage::getTitleValueFor( 'ChangeContentModel', $title->getPrefixedText() ),
 290                                 $this->msg( 'pageinfo-content-model-change' )->text()
 291                         ) )->escaped();
 292                 }
 293
 294                 $pageInfo['header-basic'][] = [
 295                         $this->msg( 'pageinfo-content-model' ),
 296                         $modelHtml
 297                 ];
 298
 299                 if ( $title->inNamespace( NS_USER ) ) {
 300                         $pageUser = User::newFromName( $title->getRootText() );
 301                         if ( $pageUser && $pageUser->getId() && !$pageUser->isHidden() ) {
 302                                 $pageInfo['header-basic'][] = [
 303                                         $this->msg( 'pageinfo-user-id' ),
 304                                         $pageUser->getId()
 305                                 ];
 306                         }
 307                 }
 308
 309                 // Search engine status
 310                 $pOutput = new ParserOutput();
 311                 if ( isset( $pageProperties['noindex'] ) ) {
 312                         $pOutput->setIndexPolicy( 'noindex' );
 313                 }
 314                 if ( isset( $pageProperties['index'] ) ) {
 315                         $pOutput->setIndexPolicy( 'index' );
 316                 }
 317
 318                 // Use robot policy logic
 319                 $policy = $this->page->getRobotPolicy( 'view', $pOutput );
 320                 $pageInfo['header-basic'][] = [
 321                         // Messages: pageinfo-robot-index, pageinfo-robot-noindex
 322                         $this->msg( 'pageinfo-robot-policy' ),
 323                         $this->msg( "pageinfo-robot-${policy['index']}" )
 324                 ];
 325
 326                 $unwatchedPageThreshold = $config->get( 'UnwatchedPageThreshold' );
 327                 if (
 328                         $user->isAllowed( 'unwatchedpages' ) ||
 329                         ( $unwatchedPageThreshold !== false &&
 330                                 $pageCounts['watchers'] >= $unwatchedPageThreshold )
 331                 ) {
 332                         // Number of page watchers
 333                         $pageInfo['header-basic'][] = [
 334                                 $this->msg( 'pageinfo-watchers' ),
 335                                 $lang->formatNum( $pageCounts['watchers'] )
 336                         ];
 337                         if (
 338                                 $config->get( 'ShowUpdatedMarker' ) &&
 339                                 isset( $pageCounts['visitingWatchers'] )
 340                         ) {
 341                                 $minToDisclose = $config->get( 'UnwatchedPageSecret' );
 342                                 if ( $pageCounts['visitingWatchers'] > $minToDisclose ||
 343                                         $user->isAllowed( 'unwatchedpages' ) ) {
 344                                         $pageInfo['header-basic'][] = [
 345                                                 $this->msg( 'pageinfo-visiting-watchers' ),
 346                                                 $lang->formatNum( $pageCounts['visitingWatchers'] )
 347                                         ];
 348                                 } else {
 349                                         $pageInfo['header-basic'][] = [
 350                                                 $this->msg( 'pageinfo-visiting-watchers' ),
 351                                                 $this->msg( 'pageinfo-few-visiting-watchers' )
 352                                         ];
 353                                 }
 354                         }
 355                 } elseif ( $unwatchedPageThreshold !== false ) {
 356                         $pageInfo['header-basic'][] = [
 357                                 $this->msg( 'pageinfo-watchers' ),
 358                                 $this->msg( 'pageinfo-few-watchers' )->numParams( $unwatchedPageThreshold )
 359                         ];
 360                 }
 361
 362                 // Redirects to this page
 363                 $whatLinksHere = SpecialPage::getTitleFor( 'Whatlinkshere', $title->getPrefixedText() );
 364                 $pageInfo['header-basic'][] = [
 365                         $linkRenderer->makeLink(
 366                                 $whatLinksHere,
 367                                 $this->msg( 'pageinfo-redirects-name' )->text(),
 368                                 [],
 369                                 [
 370                                         'hidelinks' => 1,
 371                                         'hidetrans' => 1,
 372                                         'hideimages' => $title->getNamespace() == NS_FILE
 373                                 ]
 374                         ),
 375                         $this->msg( 'pageinfo-redirects-value' )
 376                                 ->numParams( count( $title->getRedirectsHere() ) )
 377                 ];
 378
 379                 // Is it counted as a content page?
 380                 if ( $this->page->isCountable() ) {
 381                         $pageInfo['header-basic'][] = [
 382                                 $this->msg( 'pageinfo-contentpage' ),
 383                                 $this->msg( 'pageinfo-contentpage-yes' )
 384                         ];
 385                 }
 386
 387                 // Subpages of this page, if subpages are enabled for the current NS
 388                 if ( MWNamespace::hasSubpages( $title->getNamespace() ) ) {
 389                         $prefixIndex = SpecialPage::getTitleFor(
 390                                 'Prefixindex', $title->getPrefixedText() . '/' );
 391                         $pageInfo['header-basic'][] = [
 392                                 Linker::link( $prefixIndex, $this->msg( 'pageinfo-subpages-name' )->escaped() ),
 393                                 $this->msg( 'pageinfo-subpages-value' )
 394                                         ->numParams(
 395                                                 $pageCounts['subpages']['total'],
 396                                                 $pageCounts['subpages']['redirects'],
 397                                                 $pageCounts['subpages']['nonredirects'] )
 398                         ];
 399                 }
 400
 401                 if ( $title->inNamespace( NS_CATEGORY ) ) {
 402                         $category = Category::newFromTitle( $title );
 403
 404                         // $allCount is the total number of cat members,
 405                         // not the count of how many members are normal pages.
 406                         $allCount = (int)$category->getPageCount();
 407                         $subcatCount = (int)$category->getSubcatCount();
 408                         $fileCount = (int)$category->getFileCount();
 409                         $pagesCount = $allCount - $subcatCount - $fileCount;
 410
 411                         $pageInfo['category-info'] = [
 412                                 [
 413                                         $this->msg( 'pageinfo-category-total' ),
 414                                         $lang->formatNum( $allCount )
 415                                 ],
 416                                 [
 417                                         $this->msg( 'pageinfo-category-pages' ),
 418                                         $lang->formatNum( $pagesCount )
 419                                 ],
 420                                 [
 421                                         $this->msg( 'pageinfo-category-subcats' ),
 422                                         $lang->formatNum( $subcatCount )
 423                                 ],
 424                                 [
 425                                         $this->msg( 'pageinfo-category-files' ),
 426                                         $lang->formatNum( $fileCount )
 427                                 ]
 428                         ];
 429                 }
 430
 431                 // Page protection
 432                 $pageInfo['header-restrictions'] = [];
 433
 434                 // Is this page affected by the cascading protection of something which includes it?
 435                 if ( $title->isCascadeProtected() ) {
 436                         $cascadingFrom = '';
 437                         $sources = $title->getCascadeProtectionSources()[0];
 438
 439                         foreach ( $sources as $sourceTitle ) {
 440                                 $cascadingFrom .= Html::rawElement(
 441                                         'li', [], $linkRenderer->makeKnownLink( $sourceTitle ) );
 442                         }
 443
 444                         $cascadingFrom = Html::rawElement( 'ul', [], $cascadingFrom );
 445                         $pageInfo['header-restrictions'][] = [
 446                                 $this->msg( 'pageinfo-protect-cascading-from' ),
 447                                 $cascadingFrom
 448                         ];
 449                 }
 450
 451                 // Is out protection set to cascade to other pages?
 452                 if ( $title->areRestrictionsCascading() ) {
 453                         $pageInfo['header-restrictions'][] = [
 454                                 $this->msg( 'pageinfo-protect-cascading' ),
 455                                 $this->msg( 'pageinfo-protect-cascading-yes' )
 456                         ];
 457                 }
 458
 459                 // Page protection
 460                 foreach ( $title->getRestrictionTypes() as $restrictionType ) {
 461                         $protectionLevel = implode( ', ', $title->getRestrictions( $restrictionType ) );
 462
 463                         if ( $protectionLevel == '' ) {
 464                                 // Allow all users
 465                                 $message = $this->msg( 'protect-default' )->escaped();
 466                         } else {
 467                                 // Administrators only
 468                                 // Messages: protect-level-autoconfirmed, protect-level-sysop
 469                                 $message = $this->msg( "protect-level-$protectionLevel" );
 470                                 if ( $message->isDisabled() ) {
 471                                         // Require "$1" permission
 472                                         $message = $this->msg( "protect-fallback", $protectionLevel )->parse();
 473                                 } else {
 474                                         $message = $message->escaped();
 475                                 }
 476                         }
 477                         $expiry = $title->getRestrictionExpiry( $restrictionType );
 478                         $formattedexpiry = $this->msg( 'parentheses',
 479                                 $lang->formatExpiry( $expiry ) )->escaped();
 480                         $message .= $this->msg( 'word-separator' )->escaped() . $formattedexpiry;
 481
 482                         // Messages: restriction-edit, restriction-move, restriction-create,
 483                         // restriction-upload
 484                         $pageInfo['header-restrictions'][] = [
 485                                 $this->msg( "restriction-$restrictionType" ), $message
 486                         ];
 487                 }
 488
 489                 if ( !$this->page->exists() ) {
 490                         return $pageInfo;
 491                 }
 492
 493                 // Edit history
 494                 $pageInfo['header-edits'] = [];
 495
 496                 $firstRev = $this->page->getOldestRevision();
 497                 $lastRev = $this->page->getRevision();
 498                 $batch = new LinkBatch;
 499
 500                 if ( $firstRev ) {
 501                         $firstRevUser = $firstRev->getUserText( Revision::FOR_THIS_USER );
 502                         if ( $firstRevUser !== '' ) {
 503                                 $firstRevUserTitle = Title::makeTitle( NS_USER, $firstRevUser );
 504                                 $batch->addObj( $firstRevUserTitle );
 505                                 $batch->addObj( $firstRevUserTitle->getTalkPage() );
 506                         }
 507                 }
 508
 509                 if ( $lastRev ) {
 510                         $lastRevUser = $lastRev->getUserText( Revision::FOR_THIS_USER );
 511                         if ( $lastRevUser !== '' ) {
 512                                 $lastRevUserTitle = Title::makeTitle( NS_USER, $lastRevUser );
 513                                 $batch->addObj( $lastRevUserTitle );
 514                                 $batch->addObj( $lastRevUserTitle->getTalkPage() );
 515                         }
 516                 }
 517
 518                 $batch->execute();
 519
 520                 if ( $firstRev ) {
 521                         // Page creator
 522                         $pageInfo['header-edits'][] = [
 523                                 $this->msg( 'pageinfo-firstuser' ),
 524                                 Linker::revUserTools( $firstRev )
 525                         ];
 526
 527                         // Date of page creation
 528                         $pageInfo['header-edits'][] = [
 529                                 $this->msg( 'pageinfo-firsttime' ),
 530                                 $linkRenderer->makeKnownLink(
 531                                         $title,
 532                                         $lang->userTimeAndDate( $firstRev->getTimestamp(), $user ),
 533                                         [],
 534                                         [ 'oldid' => $firstRev->getId() ]
 535                                 )
 536                         ];
 537                 }
 538
 539                 if ( $lastRev ) {
 540                         // Latest editor
 541                         $pageInfo['header-edits'][] = [
 542                                 $this->msg( 'pageinfo-lastuser' ),
 543                                 Linker::revUserTools( $lastRev )
 544                         ];
 545
 546                         // Date of latest edit
 547                         $pageInfo['header-edits'][] = [
 548                                 $this->msg( 'pageinfo-lasttime' ),
 549                                 $linkRenderer->makeKnownLink(
 550                                         $title,
 551                                         $lang->userTimeAndDate( $this->page->getTimestamp(), $user ),
 552                                         [],
 553                                         [ 'oldid' => $this->page->getLatest() ]
 554                                 )
 555                         ];
 556                 }
 557
 558                 // Total number of edits
 559                 $pageInfo['header-edits'][] = [
 560                         $this->msg( 'pageinfo-edits' ), $lang->formatNum( $pageCounts['edits'] )
 561                 ];
 562
 563                 // Total number of distinct authors
 564                 if ( $pageCounts['authors'] > 0 ) {
 565                         $pageInfo['header-edits'][] = [
 566                                 $this->msg( 'pageinfo-authors' ), $lang->formatNum( $pageCounts['authors'] )
 567                         ];
 568                 }
 569
 570                 // Recent number of edits (within past 30 days)
 571                 $pageInfo['header-edits'][] = [
 572                         $this->msg( 'pageinfo-recent-edits',
 573                                 $lang->formatDuration( $config->get( 'RCMaxAge' ) ) ),
 574                         $lang->formatNum( $pageCounts['recent_edits'] )
 575                 ];
 576
 577                 // Recent number of distinct authors
 578                 $pageInfo['header-edits'][] = [
 579                         $this->msg( 'pageinfo-recent-authors' ),
 580                         $lang->formatNum( $pageCounts['recent_authors'] )
 581                 ];
 582
 583                 // Array of MagicWord objects
 584                 $magicWords = MagicWord::getDoubleUnderscoreArray();
 585
 586                 // Array of magic word IDs
 587                 $wordIDs = $magicWords->names;
 588
 589                 // Array of IDs => localized magic words
 590                 $localizedWords = $wgContLang->getMagicWords();
 591
 592                 $listItems = [];
 593                 foreach ( $pageProperties as $property => $value ) {
 594                         if ( in_array( $property, $wordIDs ) ) {
 595                                 $listItems[] = Html::element( 'li', [], $localizedWords[$property][1] );
 596                         }
 597                 }
 598
 599                 $localizedList = Html::rawElement( 'ul', [], implode( '', $listItems ) );
 600                 $hiddenCategories = $this->page->getHiddenCategories();
 601
 602                 if (
 603                         count( $listItems ) > 0 ||
 604                         count( $hiddenCategories ) > 0 ||
 605                         $pageCounts['transclusion']['from'] > 0 ||
 606                         $pageCounts['transclusion']['to'] > 0
 607                 ) {
 608                         $options = [ 'LIMIT' => $config->get( 'PageInfoTransclusionLimit' ) ];
 609                         $transcludedTemplates = $title->getTemplateLinksFrom( $options );
 610                         if ( $config->get( 'MiserMode' ) ) {
 611                                 $transcludedTargets = [];
 612                         } else {
 613                                 $transcludedTargets = $title->getTemplateLinksTo( $options );
 614                         }
 615
 616                         // Page properties
 617                         $pageInfo['header-properties'] = [];
 618
 619                         // Magic words
 620                         if ( count( $listItems ) > 0 ) {
 621                                 $pageInfo['header-properties'][] = [
 622                                         $this->msg( 'pageinfo-magic-words' )->numParams( count( $listItems ) ),
 623                                         $localizedList
 624                                 ];
 625                         }
 626
 627                         // Hidden categories
 628                         if ( count( $hiddenCategories ) > 0 ) {
 629                                 $pageInfo['header-properties'][] = [
 630                                         $this->msg( 'pageinfo-hidden-categories' )
 631                                                 ->numParams( count( $hiddenCategories ) ),
 632                                         Linker::formatHiddenCategories( $hiddenCategories )
 633                                 ];
 634                         }
 635
 636                         // Transcluded templates
 637                         if ( $pageCounts['transclusion']['from'] > 0 ) {
 638                                 if ( $pageCounts['transclusion']['from'] > count( $transcludedTemplates ) ) {
 639                                         $more = $this->msg( 'morenotlisted' )->escaped();
 640                                 } else {
 641                                         $more = null;
 642                                 }
 643
 644                                 $templateListFormatter = new TemplatesOnThisPageFormatter(
 645                                         $this->getContext(),
 646                                         $linkRenderer
 647                                 );
 648
 649                                 $pageInfo['header-properties'][] = [
 650                                         $this->msg( 'pageinfo-templates' )
 651                                                 ->numParams( $pageCounts['transclusion']['from'] ),
 652                                         $templateListFormatter->format( $transcludedTemplates, false, $more )
 653                                 ];
 654                         }
 655
 656                         if ( !$config->get( 'MiserMode' ) && $pageCounts['transclusion']['to'] > 0 ) {
 657                                 if ( $pageCounts['transclusion']['to'] > count( $transcludedTargets ) ) {
 658                                         $more = $linkRenderer->makeLink(
 659                                                 $whatLinksHere,
 660                                                 $this->msg( 'moredotdotdot' )->text(),
 661                                                 [],
 662                                                 [ 'hidelinks' => 1, 'hideredirs' => 1 ]
 663                                         );
 664                                 } else {
 665                                         $more = null;
 666                                 }
 667
 668                                 $templateListFormatter = new TemplatesOnThisPageFormatter(
 669                                         $this->getContext(),
 670                                         $linkRenderer
 671                                 );
 672
 673                                 $pageInfo['header-properties'][] = [
 674                                         $this->msg( 'pageinfo-transclusions' )
 675                                                 ->numParams( $pageCounts['transclusion']['to'] ),
 676                                         $templateListFormatter->format( $transcludedTargets, false, $more )
 677                                 ];
 678                         }
 679                 }
 680
 681                 return $pageInfo;
 682         }
 683
 684         /**
 685          * Returns page counts that would be too "expensive" to retrieve by normal means.
 686          *
 687          * @param WikiPage|Article|Page $page
 688          * @return array
 689          */
 690         protected function pageCounts( Page $page ) {
 691                 $fname = __METHOD__;
 692                 $config = $this->context->getConfig();
 693
 694                 return ObjectCache::getMainWANInstance()->getWithSetCallback(
 695                         self::getCacheKey( $page->getTitle(), $page->getLatest() ),
 696                         WANObjectCache::TTL_WEEK,
 697                         function ( $oldValue, &$ttl, &$setOpts ) use ( $page, $config, $fname ) {
 698                                 $title = $page->getTitle();
 699                                 $id = $title->getArticleID();
 700
 701                                 $dbr = wfGetDB( DB_REPLICA );
 702                                 $dbrWatchlist = wfGetDB( DB_REPLICA, 'watchlist' );
 703                                 $setOpts += Database::getCacheSetOptions( $dbr, $dbrWatchlist );
 704
 705                                 $watchedItemStore = MediaWikiServices::getInstance()->getWatchedItemStore();
 706
 707                                 $result = [];
 708                                 $result['watchers'] = $watchedItemStore->countWatchers( $title );
 709
 710                                 if ( $config->get( 'ShowUpdatedMarker' ) ) {
 711                                         $updated = wfTimestamp( TS_UNIX, $page->getTimestamp() );
 712                                         $result['visitingWatchers'] = $watchedItemStore->countVisitingWatchers(
 713                                                 $title,
 714                                                 $updated - $config->get( 'WatchersMaxAge' )
 715                                         );
 716                                 }
 717
 718                                 // Total number of edits
 719                                 $edits = (int)$dbr->selectField(
 720                                         'revision',
 721                                         'COUNT(*)',
 722                                         [ 'rev_page' => $id ],
 723                                         $fname
 724                                 );
 725                                 $result['edits'] = $edits;
 726
 727                                 // Total number of distinct authors
 728                                 if ( $config->get( 'MiserMode' ) ) {
 729                                         $result['authors'] = 0;
 730                                 } else {
 731                                         $result['authors'] = (int)$dbr->selectField(
 732                                                 'revision',
 733                                                 'COUNT(DISTINCT rev_user_text)',
 734                                                 [ 'rev_page' => $id ],
 735                                                 $fname
 736                                         );
 737                                 }
 738
 739                                 // "Recent" threshold defined by RCMaxAge setting
 740                                 $threshold = $dbr->timestamp( time() - $config->get( 'RCMaxAge' ) );
 741
 742                                 // Recent number of edits
 743                                 $edits = (int)$dbr->selectField(
 744                                         'revision',
 745                                         'COUNT(rev_page)',
 746                                         [
 747                                                 'rev_page' => $id,
 748                                                 "rev_timestamp >= " . $dbr->addQuotes( $threshold )
 749                                         ],
 750                                         $fname
 751                                 );
 752                                 $result['recent_edits'] = $edits;
 753
 754                                 // Recent number of distinct authors
 755                                 $result['recent_authors'] = (int)$dbr->selectField(
 756                                         'revision',
 757                                         'COUNT(DISTINCT rev_user_text)',
 758                                         [
 759                                                 'rev_page' => $id,
 760                                                 "rev_timestamp >= " . $dbr->addQuotes( $threshold )
 761                                         ],
 762                                         $fname
 763                                 );
 764
 765                                 // Subpages (if enabled)
 766                                 if ( MWNamespace::hasSubpages( $title->getNamespace() ) ) {
 767                                         $conds = [ 'page_namespace' => $title->getNamespace() ];
 768                                         $conds[] = 'page_title ' .
 769                                                 $dbr->buildLike( $title->getDBkey() . '/', $dbr->anyString() );
 770
 771                                         // Subpages of this page (redirects)
 772                                         $conds['page_is_redirect'] = 1;
 773                                         $result['subpages']['redirects'] = (int)$dbr->selectField(
 774                                                 'page',
 775                                                 'COUNT(page_id)',
 776                                                 $conds,
 777                                                 $fname
 778                                         );
 779
 780                                         // Subpages of this page (non-redirects)
 781                                         $conds['page_is_redirect'] = 0;
 782                                         $result['subpages']['nonredirects'] = (int)$dbr->selectField(
 783                                                 'page',
 784                                                 'COUNT(page_id)',
 785                                                 $conds,
 786                                                 $fname
 787                                         );
 788
 789                                         // Subpages of this page (total)
 790                                         $result['subpages']['total'] = $result['subpages']['redirects']
 791                                                 + $result['subpages']['nonredirects'];
 792                                 }
 793
 794                                 // Counts for the number of transclusion links (to/from)
 795                                 if ( $config->get( 'MiserMode' ) ) {
 796                                         $result['transclusion']['to'] = 0;
 797                                 } else {
 798                                         $result['transclusion']['to'] = (int)$dbr->selectField(
 799                                                 'templatelinks',
 800                                                 'COUNT(tl_from)',
 801                                                 [
 802                                                         'tl_namespace' => $title->getNamespace(),
 803                                                         'tl_title' => $title->getDBkey()
 804                                                 ],
 805                                                 $fname
 806                                         );
 807                                 }
 808
 809                                 $result['transclusion']['from'] = (int)$dbr->selectField(
 810                                         'templatelinks',
 811                                         'COUNT(*)',
 812                                         [ 'tl_from' => $title->getArticleID() ],
 813                                         $fname
 814                                 );
 815
 816                                 return $result;
 817                         }
 818                 );
 819         }
 820
 821         /**
 822          * Returns the name that goes in the "<h1>" page title.
 823          *
 824          * @return string
 825          */
 826         protected function getPageTitle() {
 827                 return $this->msg( 'pageinfo-title', $this->getTitle()->getPrefixedText() )->text();
 828         }
 829
 830         /**
 831          * Get a list of contributors of $article
 832          * @return string Html
 833          */
 834         protected function getContributors() {
 835                 $contributors = $this->page->getContributors();
 836                 $real_names = [];
 837                 $user_names = [];
 838                 $anon_ips = [];
 839                 $linkRenderer = MediaWikiServices::getLinkRenderer();
 840
 841                 # Sift for real versus user names
 842                 /** @var $user User */
 843                 foreach ( $contributors as $user ) {
 844                         $page = $user->isAnon()
 845                                 ? SpecialPage::getTitleFor( 'Contributions', $user->getName() )
 846                                 : $user->getUserPage();
 847
 848                         $hiddenPrefs = $this->context->getConfig()->get( 'HiddenPrefs' );
 849                         if ( $user->getId() == 0 ) {
 850                                 $anon_ips[] = $linkRenderer->makeLink( $page, $user->getName() );
 851                         } elseif ( !in_array( 'realname', $hiddenPrefs ) && $user->getRealName() ) {
 852                                 $real_names[] = $linkRenderer->makeLink( $page, $user->getRealName() );
 853                         } else {
 854                                 $user_names[] = $linkRenderer->makeLink( $page, $user->getName() );
 855                         }
 856                 }
 857
 858                 $lang = $this->getLanguage();
 859
 860                 $real = $lang->listToText( $real_names );
 861
 862                 # "ThisSite user(s) A, B and C"
 863                 if ( count( $user_names ) ) {
 864                         $user = $this->msg( 'siteusers' )
 865                                 ->rawParams( $lang->listToText( $user_names ) )
 866                                 ->params( count( $user_names ) )->escaped();
 867                 } else {
 868                         $user = false;
 869                 }
 870
 871                 if ( count( $anon_ips ) ) {
 872                         $anon = $this->msg( 'anonusers' )
 873                                 ->rawParams( $lang->listToText( $anon_ips ) )
 874                                 ->params( count( $anon_ips ) )->escaped();
 875                 } else {
 876                         $anon = false;
 877                 }
 878
 879                 # This is the big list, all mooshed together. We sift for blank strings
 880                 $fulllist = [];
 881                 foreach ( [ $real, $user, $anon ] as $s ) {
 882                         if ( $s !== '' ) {
 883                                 array_push( $fulllist, $s );
 884                         }
 885                 }
 886
 887                 $count = count( $fulllist );
 888
 889                 # "Based on work by ..."
 890                 return $count
 891                         ? $this->msg( 'othercontribs' )->rawParams(
 892                                 $lang->listToText( $fulllist ) )->params( $count )->escaped()
 893                         : '';
 894         }
 895
 896         /**
 897          * Returns the description that goes below the "<h1>" tag.
 898          *
 899          * @return string
 900          */
 901         protected function getDescription() {
 902                 return '';
 903         }
 904
 905         /**
 906          * @param Title $title
 907          * @param int $revId
 908          * @return string
 909          */
 910         protected static function getCacheKey( Title $title, $revId ) {
 911                 return wfMemcKey( 'infoaction', md5( $title->getPrefixedText() ), $revId, self::VERSION );
 912         }
 913 }