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 use Wikimedia\Rdbms\Database;
  27
  28 /**
  29  * Displays information about a page.
  30  *
  31  * @ingroup Actions
  32  */
  33 class InfoAction extends FormlessAction {
  34         const VERSION = 1;
  35
  36         /**
  37          * Returns the name of the action this object responds to.
  38          *
  39          * @return string Lowercase name
  40          */
  41         public function getName() {
  42                 return 'info';
  43         }
  44
  45         /**
  46          * Whether this action can still be executed by a blocked user.
  47          *
  48          * @return bool
  49          */
  50         public function requiresUnblock() {
  51                 return false;
  52         }
  53
  54         /**
  55          * Whether this action requires the wiki not to be locked.
  56          *
  57          * @return bool
  58          */
  59         public function requiresWrite() {
  60                 return false;
  61         }
  62
  63         /**
  64          * Clear the info cache for a given Title.
  65          *
  66          * @since 1.22
  67          * @param Title $title Title to clear cache for
  68          * @param int|null $revid Revision id to clear
  69          */
  70         public static function invalidateCache( Title $title, $revid = null ) {
  71                 if ( !$revid ) {
  72                         $revision = Revision::newFromTitle( $title, 0, Revision::READ_LATEST );
  73                         $revid = $revision ? $revision->getId() : null;
  74                 }
  75                 if ( $revid !== null ) {
  76                         $cache = MediaWikiServices::getInstance()->getMainWANObjectCache();
  77                         $key = self::getCacheKey( $cache, $title, $revid );
  78                         $cache->delete( $key );
  79                 }
  80         }
  81
  82         /**
  83          * Shows page information on GET request.
  84          *
  85          * @return string Page information that will be added to the output
  86          */
  87         public function onView() {
  88                 $content = '';
  89
  90                 // Validate revision
  91                 $oldid = $this->page->getOldID();
  92                 if ( $oldid ) {
  93                         $revision = $this->page->getRevisionFetched();
  94
  95                         // Revision is missing
  96                         if ( $revision === null ) {
  97                                 return $this->msg( 'missing-revision', $oldid )->parse();
  98                         }
  99
 100                         // Revision is not current
 101                         if ( !$revision->isCurrent() ) {
 102                                 return $this->msg( 'pageinfo-not-current' )->plain();
 103                         }
 104                 }
 105
 106                 // Page header
 107                 if ( !$this->msg( 'pageinfo-header' )->isDisabled() ) {
 108                         $content .= $this->msg( 'pageinfo-header' )->parse();
 109                 }
 110
 111                 // Hide "This page is a member of # hidden categories" explanation
 112                 $content .= Html::element( 'style', [],
 113                         '.mw-hiddenCategoriesExplanation { display: none; }' ) . "\n";
 114
 115                 // Hide "Templates used on this page" explanation
 116                 $content .= Html::element( 'style', [],
 117                         '.mw-templatesUsedExplanation { display: none; }' ) . "\n";
 118
 119                 // Get page information
 120                 $pageInfo = $this->pageInfo();
 121
 122                 // Allow extensions to add additional information
 123                 Hooks::run( 'InfoAction', [ $this->getContext(), &$pageInfo ] );
 124
 125                 // Render page information
 126                 foreach ( $pageInfo as $header => $infoTable ) {
 127                         // Messages:
 128                         // pageinfo-header-basic, pageinfo-header-edits, pageinfo-header-restrictions,
 129                         // pageinfo-header-properties, pageinfo-category-info
 130                         $content .= $this->makeHeader(
 131                                 $this->msg( "pageinfo-${header}" )->text(),
 132                                 "mw-pageinfo-${header}"
 133                         ) . "\n";
 134                         $table = "\n";
 135                         $below = "";
 136                         foreach ( $infoTable as $infoRow ) {
 137                                 if ( $infoRow[0] == "below" ) {
 138                                         $below = $infoRow[1] . "\n";
 139                                         continue;
 140                                 }
 141                                 $name = ( $infoRow[0] instanceof Message ) ? $infoRow[0]->escaped() : $infoRow[0];
 142                                 $value = ( $infoRow[1] instanceof Message ) ? $infoRow[1]->escaped() : $infoRow[1];
 143                                 $id = ( $infoRow[0] instanceof Message ) ? $infoRow[0]->getKey() : null;
 144                                 $table = $this->addRow( $table, $name, $value, $id ) . "\n";
 145                         }
 146                         $content = $this->addTable( $content, $table ) . "\n" . $below;
 147                 }
 148
 149                 // Page footer
 150                 if ( !$this->msg( 'pageinfo-footer' )->isDisabled() ) {
 151                         $content .= $this->msg( 'pageinfo-footer' )->parse();
 152                 }
 153
 154                 return $content;
 155         }
 156
 157         /**
 158          * Creates a header that can be added to the output.
 159          *
 160          * @param string $header The header text.
 161          * @param string $canonicalId
 162          * @return string The HTML.
 163          */
 164         protected function makeHeader( $header, $canonicalId ) {
 165                 $spanAttribs = [ 'class' => 'mw-headline', 'id' => Sanitizer::escapeIdForAttribute( $header ) ];
 166                 $h2Attribs = [ 'id' => Sanitizer::escapeIdForAttribute( $canonicalId ) ];
 167
 168                 return Html::rawElement( 'h2', $h2Attribs, Html::element( 'span', $spanAttribs, $header ) );
 169         }
 170
 171         /**
 172          * Adds a row to a table that will be added to the content.
 173          *
 174          * @param string $table The table that will be added to the content
 175          * @param string $name The name of the row
 176          * @param string $value The value of the row
 177          * @param string|null $id The ID to use for the 'tr' element
 178          * @return string The table with the row added
 179          */
 180         protected function addRow( $table, $name, $value, $id ) {
 181                 return $table .
 182                         Html::rawElement(
 183                                 'tr',
 184                                 $id === null ? [] : [ 'id' => 'mw-' . $id ],
 185                                 Html::rawElement( 'td', [ 'style' => 'vertical-align: top;' ], $name ) .
 186                                         Html::rawElement( 'td', [], $value )
 187                         );
 188         }
 189
 190         /**
 191          * Adds a table to the content that will be added to the output.
 192          *
 193          * @param string $content The content that will be added to the output
 194          * @param string $table
 195          * @return string The content with the table added
 196          */
 197         protected function addTable( $content, $table ) {
 198                 return $content . Html::rawElement( 'table', [ 'class' => 'wikitable mw-page-info' ],
 199                         $table );
 200         }
 201
 202         /**
 203          * Returns an array of info groups (will be rendered as tables), keyed by group ID.
 204          * Group IDs are arbitrary and used so that extensions may add additional information in
 205          * arbitrary positions (and as message keys for section headers for the tables, prefixed
 206          * with 'pageinfo-').
 207          * Each info group is a non-associative array of info items (rendered as table rows).
 208          * Each info item is an array with two elements: the first describes the type of
 209          * information, the second the value for the current page. Both can be strings (will be
 210          * interpreted as raw HTML) or messages (will be interpreted as plain text and escaped).
 211          *
 212          * @return array
 213          */
 214         protected function pageInfo() {
 215                 $services = MediaWikiServices::getInstance();
 216
 217                 $user = $this->getUser();
 218                 $lang = $this->getLanguage();
 219                 $title = $this->getTitle();
 220                 $id = $title->getArticleID();
 221                 $config = $this->context->getConfig();
 222                 $linkRenderer = $services->getLinkRenderer();
 223
 224                 $pageCounts = $this->pageCounts( $this->page );
 225
 226                 $props = PageProps::getInstance()->getAllProperties( $title );
 227                 $pageProperties = $props[$id] ?? [];
 228
 229                 // Basic information
 230                 $pageInfo = [];
 231                 $pageInfo['header-basic'] = [];
 232
 233                 // Display title
 234                 $displayTitle = $pageProperties['displaytitle'] ?? $title->getPrefixedText();
 235
 236                 $pageInfo['header-basic'][] = [
 237                         $this->msg( 'pageinfo-display-title' ), $displayTitle
 238                 ];
 239
 240                 // Is it a redirect? If so, where to?
 241                 $redirectTarget = $this->page->getRedirectTarget();
 242                 if ( $redirectTarget !== null ) {
 243                         $pageInfo['header-basic'][] = [
 244                                 $this->msg( 'pageinfo-redirectsto' ),
 245                                 $linkRenderer->makeLink( $redirectTarget ) .
 246                                 $this->msg( 'word-separator' )->escaped() .
 247                                 $this->msg( 'parentheses' )->rawParams( $linkRenderer->makeLink(
 248                                         $redirectTarget,
 249                                         $this->msg( 'pageinfo-redirectsto-info' )->text(),
 250                                         [],
 251                                         [ 'action' => 'info' ]
 252                                 ) )->escaped()
 253                         ];
 254                 }
 255
 256                 // Default sort key
 257                 $sortKey = $pageProperties['defaultsort'] ?? $title->getCategorySortkey();
 258
 259                 $sortKey = htmlspecialchars( $sortKey );
 260                 $pageInfo['header-basic'][] = [ $this->msg( 'pageinfo-default-sort' ), $sortKey ];
 261
 262                 // Page length (in bytes)
 263                 $pageInfo['header-basic'][] = [
 264                         $this->msg( 'pageinfo-length' ), $lang->formatNum( $title->getLength() )
 265                 ];
 266
 267                 // Page namespace
 268                 $pageNamespace = $title->getNsText();
 269                 if ( $pageNamespace ) {
 270                         $pageInfo['header-basic'][] = [ $this->msg( 'pageinfo-namespace' ), $pageNamespace ];
 271                 }
 272
 273                 // Page ID (number not localised, as it's a database ID)
 274                 $pageInfo['header-basic'][] = [ $this->msg( 'pageinfo-article-id' ), $id ];
 275
 276                 // Language in which the page content is (supposed to be) written
 277                 $pageLang = $title->getPageLanguage()->getCode();
 278
 279                 $permissionManager = MediaWikiServices::getInstance()->getPermissionManager();
 280
 281                 $pageLangHtml = $pageLang . ' - ' .
 282                         Language::fetchLanguageName( $pageLang, $lang->getCode() );
 283                 // Link to Special:PageLanguage with pre-filled page title if user has permissions
 284                 if ( $config->get( 'PageLanguageUseDB' )
 285                         && $permissionManager->userCan( 'pagelang', $user, $title )
 286                 ) {
 287                         $pageLangHtml .= ' ' . $this->msg( 'parentheses' )->rawParams( $linkRenderer->makeLink(
 288                                 SpecialPage::getTitleValueFor( 'PageLanguage', $title->getPrefixedText() ),
 289                                 $this->msg( 'pageinfo-language-change' )->text()
 290                         ) )->escaped();
 291                 }
 292
 293                 $pageInfo['header-basic'][] = [
 294                         $this->msg( 'pageinfo-language' )->escaped(),
 295                         $pageLangHtml
 296                 ];
 297
 298                 // Content model of the page
 299                 $modelHtml = htmlspecialchars( ContentHandler::getLocalizedName( $title->getContentModel() ) );
 300                 // If the user can change it, add a link to Special:ChangeContentModel
 301                 if ( $config->get( 'ContentHandlerUseDB' )
 302                         && $permissionManager->userCan( 'editcontentmodel', $user, $title )
 303                 ) {
 304                         $modelHtml .= ' ' . $this->msg( 'parentheses' )->rawParams( $linkRenderer->makeLink(
 305                                 SpecialPage::getTitleValueFor( 'ChangeContentModel', $title->getPrefixedText() ),
 306                                 $this->msg( 'pageinfo-content-model-change' )->text()
 307                         ) )->escaped();
 308                 }
 309
 310                 $pageInfo['header-basic'][] = [
 311                         $this->msg( 'pageinfo-content-model' ),
 312                         $modelHtml
 313                 ];
 314
 315                 if ( $title->inNamespace( NS_USER ) ) {
 316                         $pageUser = User::newFromName( $title->getRootText() );
 317                         if ( $pageUser && $pageUser->getId() && !$pageUser->isHidden() ) {
 318                                 $pageInfo['header-basic'][] = [
 319                                         $this->msg( 'pageinfo-user-id' ),
 320                                         $pageUser->getId()
 321                                 ];
 322                         }
 323                 }
 324
 325                 // Search engine status
 326                 $pOutput = new ParserOutput();
 327                 if ( isset( $pageProperties['noindex'] ) ) {
 328                         $pOutput->setIndexPolicy( 'noindex' );
 329                 }
 330                 if ( isset( $pageProperties['index'] ) ) {
 331                         $pOutput->setIndexPolicy( 'index' );
 332                 }
 333
 334                 // Use robot policy logic
 335                 $policy = $this->page->getRobotPolicy( 'view', $pOutput );
 336                 $pageInfo['header-basic'][] = [
 337                         // Messages: pageinfo-robot-index, pageinfo-robot-noindex
 338                         $this->msg( 'pageinfo-robot-policy' ),
 339                         $this->msg( "pageinfo-robot-${policy['index']}" )
 340                 ];
 341
 342                 $unwatchedPageThreshold = $config->get( 'UnwatchedPageThreshold' );
 343                 if (
 344                         $user->isAllowed( 'unwatchedpages' ) ||
 345                         ( $unwatchedPageThreshold !== false &&
 346                                 $pageCounts['watchers'] >= $unwatchedPageThreshold )
 347                 ) {
 348                         // Number of page watchers
 349                         $pageInfo['header-basic'][] = [
 350                                 $this->msg( 'pageinfo-watchers' ),
 351                                 $lang->formatNum( $pageCounts['watchers'] )
 352                         ];
 353                         if (
 354                                 $config->get( 'ShowUpdatedMarker' ) &&
 355                                 isset( $pageCounts['visitingWatchers'] )
 356                         ) {
 357                                 $minToDisclose = $config->get( 'UnwatchedPageSecret' );
 358                                 if ( $pageCounts['visitingWatchers'] > $minToDisclose ||
 359                                         $user->isAllowed( 'unwatchedpages' ) ) {
 360                                         $pageInfo['header-basic'][] = [
 361                                                 $this->msg( 'pageinfo-visiting-watchers' ),
 362                                                 $lang->formatNum( $pageCounts['visitingWatchers'] )
 363                                         ];
 364                                 } else {
 365                                         $pageInfo['header-basic'][] = [
 366                                                 $this->msg( 'pageinfo-visiting-watchers' ),
 367                                                 $this->msg( 'pageinfo-few-visiting-watchers' )
 368                                         ];
 369                                 }
 370                         }
 371                 } elseif ( $unwatchedPageThreshold !== false ) {
 372                         $pageInfo['header-basic'][] = [
 373                                 $this->msg( 'pageinfo-watchers' ),
 374                                 $this->msg( 'pageinfo-few-watchers' )->numParams( $unwatchedPageThreshold )
 375                         ];
 376                 }
 377
 378                 // Redirects to this page
 379                 $whatLinksHere = SpecialPage::getTitleFor( 'Whatlinkshere', $title->getPrefixedText() );
 380                 $pageInfo['header-basic'][] = [
 381                         $linkRenderer->makeLink(
 382                                 $whatLinksHere,
 383                                 $this->msg( 'pageinfo-redirects-name' )->text(),
 384                                 [],
 385                                 [
 386                                         'hidelinks' => 1,
 387                                         'hidetrans' => 1,
 388                                         'hideimages' => $title->getNamespace() == NS_FILE
 389                                 ]
 390                         ),
 391                         $this->msg( 'pageinfo-redirects-value' )
 392                                 ->numParams( count( $title->getRedirectsHere() ) )
 393                 ];
 394
 395                 // Is it counted as a content page?
 396                 if ( $this->page->isCountable() ) {
 397                         $pageInfo['header-basic'][] = [
 398                                 $this->msg( 'pageinfo-contentpage' ),
 399                                 $this->msg( 'pageinfo-contentpage-yes' )
 400                         ];
 401                 }
 402
 403                 // Subpages of this page, if subpages are enabled for the current NS
 404                 if ( $services->getNamespaceInfo()->hasSubpages( $title->getNamespace() ) ) {
 405                         $prefixIndex = SpecialPage::getTitleFor(
 406                                 'Prefixindex', $title->getPrefixedText() . '/' );
 407                         $pageInfo['header-basic'][] = [
 408                                 $linkRenderer->makeLink(
 409                                         $prefixIndex,
 410                                         $this->msg( 'pageinfo-subpages-name' )->text()
 411                                 ),
 412                                 $this->msg( 'pageinfo-subpages-value' )
 413                                         ->numParams(
 414                                                 $pageCounts['subpages']['total'],
 415                                                 $pageCounts['subpages']['redirects'],
 416                                                 $pageCounts['subpages']['nonredirects'] )
 417                         ];
 418                 }
 419
 420                 if ( $title->inNamespace( NS_CATEGORY ) ) {
 421                         $category = Category::newFromTitle( $title );
 422
 423                         // $allCount is the total number of cat members,
 424                         // not the count of how many members are normal pages.
 425                         $allCount = (int)$category->getPageCount();
 426                         $subcatCount = (int)$category->getSubcatCount();
 427                         $fileCount = (int)$category->getFileCount();
 428                         $pagesCount = $allCount - $subcatCount - $fileCount;
 429
 430                         $pageInfo['category-info'] = [
 431                                 [
 432                                         $this->msg( 'pageinfo-category-total' ),
 433                                         $lang->formatNum( $allCount )
 434                                 ],
 435                                 [
 436                                         $this->msg( 'pageinfo-category-pages' ),
 437                                         $lang->formatNum( $pagesCount )
 438                                 ],
 439                                 [
 440                                         $this->msg( 'pageinfo-category-subcats' ),
 441                                         $lang->formatNum( $subcatCount )
 442                                 ],
 443                                 [
 444                                         $this->msg( 'pageinfo-category-files' ),
 445                                         $lang->formatNum( $fileCount )
 446                                 ]
 447                         ];
 448                 }
 449
 450                 // Display image SHA-1 value
 451                 if ( $title->inNamespace( NS_FILE ) ) {
 452                         $fileObj = wfFindFile( $title );
 453                         if ( $fileObj !== false ) {
 454                                 // Convert the base-36 sha1 value obtained from database to base-16
 455                                 $output = Wikimedia\base_convert( $fileObj->getSha1(), 36, 16, 40 );
 456                                 $pageInfo['header-basic'][] = [
 457                                         $this->msg( 'pageinfo-file-hash' ),
 458                                         $output
 459                                 ];
 460                         }
 461                 }
 462
 463                 // Page protection
 464                 $pageInfo['header-restrictions'] = [];
 465
 466                 // Is this page affected by the cascading protection of something which includes it?
 467                 if ( $title->isCascadeProtected() ) {
 468                         $cascadingFrom = '';
 469                         $sources = $title->getCascadeProtectionSources()[0];
 470
 471                         foreach ( $sources as $sourceTitle ) {
 472                                 $cascadingFrom .= Html::rawElement(
 473                                         'li', [], $linkRenderer->makeKnownLink( $sourceTitle ) );
 474                         }
 475
 476                         $cascadingFrom = Html::rawElement( 'ul', [], $cascadingFrom );
 477                         $pageInfo['header-restrictions'][] = [
 478                                 $this->msg( 'pageinfo-protect-cascading-from' ),
 479                                 $cascadingFrom
 480                         ];
 481                 }
 482
 483                 // Is out protection set to cascade to other pages?
 484                 if ( $title->areRestrictionsCascading() ) {
 485                         $pageInfo['header-restrictions'][] = [
 486                                 $this->msg( 'pageinfo-protect-cascading' ),
 487                                 $this->msg( 'pageinfo-protect-cascading-yes' )
 488                         ];
 489                 }
 490
 491                 // Page protection
 492                 foreach ( $title->getRestrictionTypes() as $restrictionType ) {
 493                         $protectionLevel = implode( ', ', $title->getRestrictions( $restrictionType ) );
 494
 495                         if ( $protectionLevel == '' ) {
 496                                 // Allow all users
 497                                 $message = $this->msg( 'protect-default' )->escaped();
 498                         } else {
 499                                 // Administrators only
 500                                 // Messages: protect-level-autoconfirmed, protect-level-sysop
 501                                 $message = $this->msg( "protect-level-$protectionLevel" );
 502                                 if ( $message->isDisabled() ) {
 503                                         // Require "$1" permission
 504                                         $message = $this->msg( "protect-fallback", $protectionLevel )->parse();
 505                                 } else {
 506                                         $message = $message->escaped();
 507                                 }
 508                         }
 509                         $expiry = $title->getRestrictionExpiry( $restrictionType );
 510                         $formattedexpiry = $this->msg( 'parentheses',
 511                                 $lang->formatExpiry( $expiry ) )->escaped();
 512                         $message .= $this->msg( 'word-separator' )->escaped() . $formattedexpiry;
 513
 514                         // Messages: restriction-edit, restriction-move, restriction-create,
 515                         // restriction-upload
 516                         $pageInfo['header-restrictions'][] = [
 517                                 $this->msg( "restriction-$restrictionType" ), $message
 518                         ];
 519                 }
 520                 $protectLog = SpecialPage::getTitleFor( 'Log' );
 521                 $pageInfo['header-restrictions'][] = [
 522                         'below',
 523                         $linkRenderer->makeKnownLink(
 524                                 $protectLog,
 525                                 $this->msg( 'pageinfo-view-protect-log' )->text(),
 526                                 [],
 527                                 [ 'type' => 'protect', 'page' => $title->getPrefixedText() ]
 528                         ),
 529                 ];
 530
 531                 if ( !$this->page->exists() ) {
 532                         return $pageInfo;
 533                 }
 534
 535                 // Edit history
 536                 $pageInfo['header-edits'] = [];
 537
 538                 $firstRev = $this->page->getOldestRevision();
 539                 $lastRev = $this->page->getRevision();
 540                 $batch = new LinkBatch;
 541
 542                 if ( $firstRev ) {
 543                         $firstRevUser = $firstRev->getUserText( Revision::FOR_THIS_USER );
 544                         if ( $firstRevUser !== '' ) {
 545                                 $firstRevUserTitle = Title::makeTitle( NS_USER, $firstRevUser );
 546                                 $batch->addObj( $firstRevUserTitle );
 547                                 $batch->addObj( $firstRevUserTitle->getTalkPage() );
 548                         }
 549                 }
 550
 551                 if ( $lastRev ) {
 552                         $lastRevUser = $lastRev->getUserText( Revision::FOR_THIS_USER );
 553                         if ( $lastRevUser !== '' ) {
 554                                 $lastRevUserTitle = Title::makeTitle( NS_USER, $lastRevUser );
 555                                 $batch->addObj( $lastRevUserTitle );
 556                                 $batch->addObj( $lastRevUserTitle->getTalkPage() );
 557                         }
 558                 }
 559
 560                 $batch->execute();
 561
 562                 if ( $firstRev ) {
 563                         // Page creator
 564                         $pageInfo['header-edits'][] = [
 565                                 $this->msg( 'pageinfo-firstuser' ),
 566                                 Linker::revUserTools( $firstRev )
 567                         ];
 568
 569                         // Date of page creation
 570                         $pageInfo['header-edits'][] = [
 571                                 $this->msg( 'pageinfo-firsttime' ),
 572                                 $linkRenderer->makeKnownLink(
 573                                         $title,
 574                                         $lang->userTimeAndDate( $firstRev->getTimestamp(), $user ),
 575                                         [],
 576                                         [ 'oldid' => $firstRev->getId() ]
 577                                 )
 578                         ];
 579                 }
 580
 581                 if ( $lastRev ) {
 582                         // Latest editor
 583                         $pageInfo['header-edits'][] = [
 584                                 $this->msg( 'pageinfo-lastuser' ),
 585                                 Linker::revUserTools( $lastRev )
 586                         ];
 587
 588                         // Date of latest edit
 589                         $pageInfo['header-edits'][] = [
 590                                 $this->msg( 'pageinfo-lasttime' ),
 591                                 $linkRenderer->makeKnownLink(
 592                                         $title,
 593                                         $lang->userTimeAndDate( $this->page->getTimestamp(), $user ),
 594                                         [],
 595                                         [ 'oldid' => $this->page->getLatest() ]
 596                                 )
 597                         ];
 598                 }
 599
 600                 // Total number of edits
 601                 $pageInfo['header-edits'][] = [
 602                         $this->msg( 'pageinfo-edits' ), $lang->formatNum( $pageCounts['edits'] )
 603                 ];
 604
 605                 // Total number of distinct authors
 606                 if ( $pageCounts['authors'] > 0 ) {
 607                         $pageInfo['header-edits'][] = [
 608                                 $this->msg( 'pageinfo-authors' ), $lang->formatNum( $pageCounts['authors'] )
 609                         ];
 610                 }
 611
 612                 // Recent number of edits (within past 30 days)
 613                 $pageInfo['header-edits'][] = [
 614                         $this->msg( 'pageinfo-recent-edits',
 615                                 $lang->formatDuration( $config->get( 'RCMaxAge' ) ) ),
 616                         $lang->formatNum( $pageCounts['recent_edits'] )
 617                 ];
 618
 619                 // Recent number of distinct authors
 620                 $pageInfo['header-edits'][] = [
 621                         $this->msg( 'pageinfo-recent-authors' ),
 622                         $lang->formatNum( $pageCounts['recent_authors'] )
 623                 ];
 624
 625                 // Array of MagicWord objects
 626                 $magicWords = $services->getMagicWordFactory()->getDoubleUnderscoreArray();
 627
 628                 // Array of magic word IDs
 629                 $wordIDs = $magicWords->names;
 630
 631                 // Array of IDs => localized magic words
 632                 $localizedWords = $services->getContentLanguage()->getMagicWords();
 633
 634                 $listItems = [];
 635                 foreach ( $pageProperties as $property => $value ) {
 636                         if ( in_array( $property, $wordIDs ) ) {
 637                                 $listItems[] = Html::element( 'li', [], $localizedWords[$property][1] );
 638                         }
 639                 }
 640
 641                 $localizedList = Html::rawElement( 'ul', [], implode( '', $listItems ) );
 642                 $hiddenCategories = $this->page->getHiddenCategories();
 643
 644                 if (
 645                         count( $listItems ) > 0 ||
 646                         count( $hiddenCategories ) > 0 ||
 647                         $pageCounts['transclusion']['from'] > 0 ||
 648                         $pageCounts['transclusion']['to'] > 0
 649                 ) {
 650                         $options = [ 'LIMIT' => $config->get( 'PageInfoTransclusionLimit' ) ];
 651                         $transcludedTemplates = $title->getTemplateLinksFrom( $options );
 652                         if ( $config->get( 'MiserMode' ) ) {
 653                                 $transcludedTargets = [];
 654                         } else {
 655                                 $transcludedTargets = $title->getTemplateLinksTo( $options );
 656                         }
 657
 658                         // Page properties
 659                         $pageInfo['header-properties'] = [];
 660
 661                         // Magic words
 662                         if ( count( $listItems ) > 0 ) {
 663                                 $pageInfo['header-properties'][] = [
 664                                         $this->msg( 'pageinfo-magic-words' )->numParams( count( $listItems ) ),
 665                                         $localizedList
 666                                 ];
 667                         }
 668
 669                         // Hidden categories
 670                         if ( count( $hiddenCategories ) > 0 ) {
 671                                 $pageInfo['header-properties'][] = [
 672                                         $this->msg( 'pageinfo-hidden-categories' )
 673                                                 ->numParams( count( $hiddenCategories ) ),
 674                                         Linker::formatHiddenCategories( $hiddenCategories )
 675                                 ];
 676                         }
 677
 678                         // Transcluded templates
 679                         if ( $pageCounts['transclusion']['from'] > 0 ) {
 680                                 if ( $pageCounts['transclusion']['from'] > count( $transcludedTemplates ) ) {
 681                                         $more = $this->msg( 'morenotlisted' )->escaped();
 682                                 } else {
 683                                         $more = null;
 684                                 }
 685
 686                                 $templateListFormatter = new TemplatesOnThisPageFormatter(
 687                                         $this->getContext(),
 688                                         $linkRenderer
 689                                 );
 690
 691                                 $pageInfo['header-properties'][] = [
 692                                         $this->msg( 'pageinfo-templates' )
 693                                                 ->numParams( $pageCounts['transclusion']['from'] ),
 694                                         $templateListFormatter->format( $transcludedTemplates, false, $more )
 695                                 ];
 696                         }
 697
 698                         if ( !$config->get( 'MiserMode' ) && $pageCounts['transclusion']['to'] > 0 ) {
 699                                 if ( $pageCounts['transclusion']['to'] > count( $transcludedTargets ) ) {
 700                                         $more = $linkRenderer->makeLink(
 701                                                 $whatLinksHere,
 702                                                 $this->msg( 'moredotdotdot' )->text(),
 703                                                 [],
 704                                                 [ 'hidelinks' => 1, 'hideredirs' => 1 ]
 705                                         );
 706                                 } else {
 707                                         $more = null;
 708                                 }
 709
 710                                 $templateListFormatter = new TemplatesOnThisPageFormatter(
 711                                         $this->getContext(),
 712                                         $linkRenderer
 713                                 );
 714
 715                                 $pageInfo['header-properties'][] = [
 716                                         $this->msg( 'pageinfo-transclusions' )
 717                                                 ->numParams( $pageCounts['transclusion']['to'] ),
 718                                         $templateListFormatter->format( $transcludedTargets, false, $more )
 719                                 ];
 720                         }
 721                 }
 722
 723                 return $pageInfo;
 724         }
 725
 726         /**
 727          * Returns page counts that would be too "expensive" to retrieve by normal means.
 728          *
 729          * @param WikiPage|Article|Page $page
 730          * @return array
 731          */
 732         protected function pageCounts( Page $page ) {
 733                 $fname = __METHOD__;
 734                 $config = $this->context->getConfig();
 735                 $services = MediaWikiServices::getInstance();
 736                 $cache = $services->getMainWANObjectCache();
 737
 738                 return $cache->getWithSetCallback(
 739                         self::getCacheKey( $cache, $page->getTitle(), $page->getLatest() ),
 740                         WANObjectCache::TTL_WEEK,
 741                         function ( $oldValue, &$ttl, &$setOpts ) use ( $page, $config, $fname, $services ) {
 742                                 global $wgActorTableSchemaMigrationStage;
 743
 744                                 $title = $page->getTitle();
 745                                 $id = $title->getArticleID();
 746
 747                                 $dbr = wfGetDB( DB_REPLICA );
 748                                 $dbrWatchlist = wfGetDB( DB_REPLICA, 'watchlist' );
 749                                 $setOpts += Database::getCacheSetOptions( $dbr, $dbrWatchlist );
 750
 751                                 if ( $wgActorTableSchemaMigrationStage & SCHEMA_COMPAT_READ_NEW ) {
 752                                         $tables = [ 'revision_actor_temp' ];
 753                                         $field = 'revactor_actor';
 754                                         $pageField = 'revactor_page';
 755                                         $tsField = 'revactor_timestamp';
 756                                         $joins = [];
 757                                 } else {
 758                                         $tables = [ 'revision' ];
 759                                         $field = 'rev_user_text';
 760                                         $pageField = 'rev_page';
 761                                         $tsField = 'rev_timestamp';
 762                                         $joins = [];
 763                                 }
 764
 765                                 $watchedItemStore = $services->getWatchedItemStore();
 766
 767                                 $result = [];
 768                                 $result['watchers'] = $watchedItemStore->countWatchers( $title );
 769
 770                                 if ( $config->get( 'ShowUpdatedMarker' ) ) {
 771                                         $updated = wfTimestamp( TS_UNIX, $page->getTimestamp() );
 772                                         $result['visitingWatchers'] = $watchedItemStore->countVisitingWatchers(
 773                                                 $title,
 774                                                 $updated - $config->get( 'WatchersMaxAge' )
 775                                         );
 776                                 }
 777
 778                                 // Total number of edits
 779                                 $edits = (int)$dbr->selectField(
 780                                         'revision',
 781                                         'COUNT(*)',
 782                                         [ 'rev_page' => $id ],
 783                                         $fname
 784                                 );
 785                                 $result['edits'] = $edits;
 786
 787                                 // Total number of distinct authors
 788                                 if ( $config->get( 'MiserMode' ) ) {
 789                                         $result['authors'] = 0;
 790                                 } else {
 791                                         $result['authors'] = (int)$dbr->selectField(
 792                                                 $tables,
 793                                                 "COUNT(DISTINCT $field)",
 794                                                 [ $pageField => $id ],
 795                                                 $fname,
 796                                                 [],
 797                                                 $joins
 798                                         );
 799                                 }
 800
 801                                 // "Recent" threshold defined by RCMaxAge setting
 802                                 $threshold = $dbr->timestamp( time() - $config->get( 'RCMaxAge' ) );
 803
 804                                 // Recent number of edits
 805                                 $edits = (int)$dbr->selectField(
 806                                         'revision',
 807                                         'COUNT(rev_page)',
 808                                         [
 809                                                 'rev_page' => $id,
 810                                                 "rev_timestamp >= " . $dbr->addQuotes( $threshold )
 811                                         ],
 812                                         $fname
 813                                 );
 814                                 $result['recent_edits'] = $edits;
 815
 816                                 // Recent number of distinct authors
 817                                 $result['recent_authors'] = (int)$dbr->selectField(
 818                                         $tables,
 819                                         "COUNT(DISTINCT $field)",
 820                                         [
 821                                                 $pageField => $id,
 822                                                 "$tsField >= " . $dbr->addQuotes( $threshold )
 823                                         ],
 824                                         $fname,
 825                                         [],
 826                                         $joins
 827                                 );
 828
 829                                 // Subpages (if enabled)
 830                                 if ( $services->getNamespaceInfo()->hasSubpages( $title->getNamespace() ) ) {
 831                                         $conds = [ 'page_namespace' => $title->getNamespace() ];
 832                                         $conds[] = 'page_title ' .
 833                                                 $dbr->buildLike( $title->getDBkey() . '/', $dbr->anyString() );
 834
 835                                         // Subpages of this page (redirects)
 836                                         $conds['page_is_redirect'] = 1;
 837                                         $result['subpages']['redirects'] = (int)$dbr->selectField(
 838                                                 'page',
 839                                                 'COUNT(page_id)',
 840                                                 $conds,
 841                                                 $fname
 842                                         );
 843
 844                                         // Subpages of this page (non-redirects)
 845                                         $conds['page_is_redirect'] = 0;
 846                                         $result['subpages']['nonredirects'] = (int)$dbr->selectField(
 847                                                 'page',
 848                                                 'COUNT(page_id)',
 849                                                 $conds,
 850                                                 $fname
 851                                         );
 852
 853                                         // Subpages of this page (total)
 854                                         $result['subpages']['total'] = $result['subpages']['redirects']
 855                                                 + $result['subpages']['nonredirects'];
 856                                 }
 857
 858                                 // Counts for the number of transclusion links (to/from)
 859                                 if ( $config->get( 'MiserMode' ) ) {
 860                                         $result['transclusion']['to'] = 0;
 861                                 } else {
 862                                         $result['transclusion']['to'] = (int)$dbr->selectField(
 863                                                 'templatelinks',
 864                                                 'COUNT(tl_from)',
 865                                                 [
 866                                                         'tl_namespace' => $title->getNamespace(),
 867                                                         'tl_title' => $title->getDBkey()
 868                                                 ],
 869                                                 $fname
 870                                         );
 871                                 }
 872
 873                                 $result['transclusion']['from'] = (int)$dbr->selectField(
 874                                         'templatelinks',
 875                                         'COUNT(*)',
 876                                         [ 'tl_from' => $title->getArticleID() ],
 877                                         $fname
 878                                 );
 879
 880                                 return $result;
 881                         }
 882                 );
 883         }
 884
 885         /**
 886          * Returns the name that goes in the "<h1>" page title.
 887          *
 888          * @return string
 889          */
 890         protected function getPageTitle() {
 891                 return $this->msg( 'pageinfo-title', $this->getTitle()->getPrefixedText() )->text();
 892         }
 893
 894         /**
 895          * Get a list of contributors of $article
 896          * @return string Html
 897          */
 898         protected function getContributors() {
 899                 $contributors = $this->page->getContributors();
 900                 $real_names = [];
 901                 $user_names = [];
 902                 $anon_ips = [];
 903                 $linkRenderer = MediaWikiServices::getInstance()->getLinkRenderer();
 904
 905                 # Sift for real versus user names
 906                 /** @var User $user */
 907                 foreach ( $contributors as $user ) {
 908                         $page = $user->isAnon()
 909                                 ? SpecialPage::getTitleFor( 'Contributions', $user->getName() )
 910                                 : $user->getUserPage();
 911
 912                         $hiddenPrefs = $this->context->getConfig()->get( 'HiddenPrefs' );
 913                         if ( $user->getId() == 0 ) {
 914                                 $anon_ips[] = $linkRenderer->makeLink( $page, $user->getName() );
 915                         } elseif ( !in_array( 'realname', $hiddenPrefs ) && $user->getRealName() ) {
 916                                 $real_names[] = $linkRenderer->makeLink( $page, $user->getRealName() );
 917                         } else {
 918                                 $user_names[] = $linkRenderer->makeLink( $page, $user->getName() );
 919                         }
 920                 }
 921
 922                 $lang = $this->getLanguage();
 923
 924                 $real = $lang->listToText( $real_names );
 925
 926                 # "ThisSite user(s) A, B and C"
 927                 if ( count( $user_names ) ) {
 928                         $user = $this->msg( 'siteusers' )
 929                                 ->rawParams( $lang->listToText( $user_names ) )
 930                                 ->params( count( $user_names ) )->escaped();
 931                 } else {
 932                         $user = false;
 933                 }
 934
 935                 if ( count( $anon_ips ) ) {
 936                         $anon = $this->msg( 'anonusers' )
 937                                 ->rawParams( $lang->listToText( $anon_ips ) )
 938                                 ->params( count( $anon_ips ) )->escaped();
 939                 } else {
 940                         $anon = false;
 941                 }
 942
 943                 # This is the big list, all mooshed together. We sift for blank strings
 944                 $fulllist = [];
 945                 foreach ( [ $real, $user, $anon ] as $s ) {
 946                         if ( $s !== '' ) {
 947                                 array_push( $fulllist, $s );
 948                         }
 949                 }
 950
 951                 $count = count( $fulllist );
 952
 953                 # "Based on work by ..."
 954                 return $count
 955                         ? $this->msg( 'othercontribs' )->rawParams(
 956                                 $lang->listToText( $fulllist ) )->params( $count )->escaped()
 957                         : '';
 958         }
 959
 960         /**
 961          * Returns the description that goes below the "<h1>" tag.
 962          *
 963          * @return string
 964          */
 965         protected function getDescription() {
 966                 return '';
 967         }
 968
 969         /**
 970          * @param WANObjectCache $cache
 971          * @param Title $title
 972          * @param int $revId
 973          * @return string
 974          */
 975         protected static function getCacheKey( WANObjectCache $cache, Title $title, $revId ) {
 976                 return $cache->makeKey( 'infoaction', md5( $title->getPrefixedText() ), $revId, self::VERSION );
 977         }
 978 }