includes/actions/InfoAction.php

   1 <?php
   2 /**
   3  * Displays information about a page.
   4  *
   5  * Copyright © 2011 Alexandre Emsenhuber
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
  20  *
  21  * @file
  22  * @ingroup Actions
  23  */
  24
  25 /**
  26  * Displays information about a page.
  27  *
  28  * @ingroup Actions
  29  */
  30 class InfoAction extends FormlessAction {
  31         const VERSION = 1;
  32
  33         /**
  34          * Returns the name of the action this object responds to.
  35          *
  36          * @return string Lowercase name
  37          */
  38         public function getName() {
  39                 return 'info';
  40         }
  41
  42         /**
  43          * Whether this action can still be executed by a blocked user.
  44          *
  45          * @return bool
  46          */
  47         public function requiresUnblock() {
  48                 return false;
  49         }
  50
  51         /**
  52          * Whether this action requires the wiki not to be locked.
  53          *
  54          * @return bool
  55          */
  56         public function requiresWrite() {
  57                 return false;
  58         }
  59
  60         /**
  61          * Clear the info cache for a given Title.
  62          *
  63          * @since 1.22
  64          * @param Title $title Title to clear cache for
  65          * @param int|null $revid Revision id to clear
  66          */
  67         public static function invalidateCache( Title $title, $revid = null ) {
  68                 if ( !$revid ) {
  69                         $revision = Revision::newFromTitle( $title, 0, Revision::READ_LATEST );
  70                         $revid = $revision ? $revision->getId() : null;
  71                 }
  72                 if ( $revid !== null ) {
  73                         $key = self::getCacheKey( $title, $revid );
  74                         ObjectCache::getMainWANInstance()->delete( $key );
  75                 }
  76         }
  77
  78         /**
  79          * Shows page information on GET request.
  80          *
  81          * @return string Page information that will be added to the output
  82          */
  83         public function onView() {
  84                 $content = '';
  85
  86                 // Validate revision
  87                 $oldid = $this->page->getOldID();
  88                 if ( $oldid ) {
  89                         $revision = $this->page->getRevisionFetched();
  90
  91                         // Revision is missing
  92                         if ( $revision === null ) {
  93                                 return $this->msg( 'missing-revision', $oldid )->parse();
  94                         }
  95
  96                         // Revision is not current
  97                         if ( !$revision->isCurrent() ) {
  98                                 return $this->msg( 'pageinfo-not-current' )->plain();
  99                         }
 100                 }
 101
 102                 // Page header
 103                 if ( !$this->msg( 'pageinfo-header' )->isDisabled() ) {
 104                         $content .= $this->msg( 'pageinfo-header' )->parse();
 105                 }
 106
 107                 // Hide "This page is a member of # hidden categories" explanation
 108                 $content .= Html::element( 'style', array(),
 109                         '.mw-hiddenCategoriesExplanation { display: none; }' ) . "\n";
 110
 111                 // Hide "Templates used on this page" explanation
 112                 $content .= Html::element( 'style', array(),
 113                         '.mw-templatesUsedExplanation { display: none; }' ) . "\n";
 114
 115                 // Get page information
 116                 $pageInfo = $this->pageInfo();
 117
 118                 // Allow extensions to add additional information
 119                 Hooks::run( 'InfoAction', array( $this->getContext(), &$pageInfo ) );
 120
 121                 // Render page information
 122                 foreach ( $pageInfo as $header => $infoTable ) {
 123                         // Messages:
 124                         // pageinfo-header-basic, pageinfo-header-edits, pageinfo-header-restrictions,
 125                         // pageinfo-header-properties, pageinfo-category-info
 126                         $content .= $this->makeHeader( $this->msg( "pageinfo-${header}" )->escaped() ) . "\n";
 127                         $table = "\n";
 128                         foreach ( $infoTable as $infoRow ) {
 129                                 $name = ( $infoRow[0] instanceof Message ) ? $infoRow[0]->escaped() : $infoRow[0];
 130                                 $value = ( $infoRow[1] instanceof Message ) ? $infoRow[1]->escaped() : $infoRow[1];
 131                                 $id = ( $infoRow[0] instanceof Message ) ? $infoRow[0]->getKey() : null;
 132                                 $table = $this->addRow( $table, $name, $value, $id ) . "\n";
 133                         }
 134                         $content = $this->addTable( $content, $table ) . "\n";
 135                 }
 136
 137                 // Page footer
 138                 if ( !$this->msg( 'pageinfo-footer' )->isDisabled() ) {
 139                         $content .= $this->msg( 'pageinfo-footer' )->parse();
 140                 }
 141
 142                 // Page credits
 143                 /*if ( $this->page->exists() ) {
 144                         $content .= Html::rawElement( 'div', array( 'id' => 'mw-credits' ), $this->getContributors() );
 145                 }*/
 146
 147                 return $content;
 148         }
 149
 150         /**
 151          * Creates a header that can be added to the output.
 152          *
 153          * @param string $header The header text.
 154          * @return string The HTML.
 155          */
 156         protected function makeHeader( $header ) {
 157                 $spanAttribs = array( 'class' => 'mw-headline', 'id' => Sanitizer::escapeId( $header ) );
 158
 159                 return Html::rawElement( 'h2', array(), Html::element( 'span', $spanAttribs, $header ) );
 160         }
 161
 162         /**
 163          * Adds a row to a table that will be added to the content.
 164          *
 165          * @param string $table The table that will be added to the content
 166          * @param string $name The name of the row
 167          * @param string $value The value of the row
 168          * @param string $id The ID to use for the 'tr' element
 169          * @return string The table with the row added
 170          */
 171         protected function addRow( $table, $name, $value, $id ) {
 172                 return $table . Html::rawElement( 'tr', $id === null ? array() : array( 'id' => 'mw-' . $id ),
 173                         Html::rawElement( 'td', array( 'style' => 'vertical-align: top;' ), $name ) .
 174                         Html::rawElement( 'td', array(), $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', array( 'class' => 'wikitable mw-page-info' ),
 187                         $table );
 188         }
 189
 190         /**
 191          * Returns page information in an easily-manipulated format. Array keys are used so extensions
 192          * may add additional information in arbitrary positions. Array values are arrays with one
 193          * element to be rendered as a header, arrays with two elements to be rendered as a table row.
 194          *
 195          * @return array
 196          */
 197         protected function pageInfo() {
 198                 global $wgContLang;
 199
 200                 $user = $this->getUser();
 201                 $lang = $this->getLanguage();
 202                 $title = $this->getTitle();
 203                 $id = $title->getArticleID();
 204                 $config = $this->context->getConfig();
 205
 206                 $pageCounts = $this->pageCounts( $this->page );
 207
 208                 // Get page properties
 209                 $dbr = wfGetDB( DB_SLAVE );
 210                 $result = $dbr->select(
 211                         'page_props',
 212                         array( 'pp_propname', 'pp_value' ),
 213                         array( 'pp_page' => $id ),
 214                         __METHOD__
 215                 );
 216
 217                 $pageProperties = array();
 218                 foreach ( $result as $row ) {
 219                         $pageProperties[$row->pp_propname] = $row->pp_value;
 220                 }
 221
 222                 // Basic information
 223                 $pageInfo = array();
 224                 $pageInfo['header-basic'] = array();
 225
 226                 // Display title
 227                 $displayTitle = $title->getPrefixedText();
 228                 if ( isset( $pageProperties['displaytitle'] ) ) {
 229                         $displayTitle = $pageProperties['displaytitle'];
 230                 }
 231
 232                 $pageInfo['header-basic'][] = array(
 233                         $this->msg( 'pageinfo-display-title' ), $displayTitle
 234                 );
 235
 236                 // Is it a redirect? If so, where to?
 237                 if ( $title->isRedirect() ) {
 238                         $pageInfo['header-basic'][] = array(
 239                                 $this->msg( 'pageinfo-redirectsto' ),
 240                                 Linker::link( $this->page->getRedirectTarget() ) .
 241                                 $this->msg( 'word-separator' )->escaped() .
 242                                 $this->msg( 'parentheses' )->rawParams( Linker::link(
 243                                         $this->page->getRedirectTarget(),
 244                                         $this->msg( 'pageinfo-redirectsto-info' )->escaped(),
 245                                         array(),
 246                                         array( 'action' => 'info' )
 247                                 ) )->escaped()
 248                         );
 249                 }
 250
 251                 // Default sort key
 252                 $sortKey = $title->getCategorySortkey();
 253                 if ( isset( $pageProperties['defaultsort'] ) ) {
 254                         $sortKey = $pageProperties['defaultsort'];
 255                 }
 256
 257                 $sortKey = htmlspecialchars( $sortKey );
 258                 $pageInfo['header-basic'][] = array( $this->msg( 'pageinfo-default-sort' ), $sortKey );
 259
 260                 // Page length (in bytes)
 261                 $pageInfo['header-basic'][] = array(
 262                         $this->msg( 'pageinfo-length' ), $lang->formatNum( $title->getLength() )
 263                 );
 264
 265                 // Page ID (number not localised, as it's a database ID)
 266                 $pageInfo['header-basic'][] = array( $this->msg( 'pageinfo-article-id' ), $id );
 267
 268                 // Language in which the page content is (supposed to be) written
 269                 $pageLang = $title->getPageLanguage()->getCode();
 270
 271                 if ( $config->get( 'PageLanguageUseDB' )
 272                         && $this->getTitle()->userCan( 'pagelang', $this->getUser() )
 273                 ) {
 274                         // Link to Special:PageLanguage with pre-filled page title if user has permissions
 275                         $titleObj = SpecialPage::getTitleFor( 'PageLanguage', $title->getPrefixedText() );
 276                         $langDisp = Linker::link(
 277                                 $titleObj,
 278                                 $this->msg( 'pageinfo-language' )->escaped()
 279                         );
 280                 } else {
 281                         // Display just the message
 282                         $langDisp = $this->msg( 'pageinfo-language' )->escaped();
 283                 }
 284
 285                 $pageInfo['header-basic'][] = array( $langDisp,
 286                         Language::fetchLanguageName( $pageLang, $lang->getCode() )
 287                         . ' ' . $this->msg( 'parentheses', $pageLang )->escaped() );
 288
 289                 // Content model of the page
 290                 $pageInfo['header-basic'][] = array(
 291                         $this->msg( 'pageinfo-content-model' ),
 292                         htmlspecialchars( ContentHandler::getLocalizedName( $title->getContentModel() ) )
 293                 );
 294
 295                 // Search engine status
 296                 $pOutput = new ParserOutput();
 297                 if ( isset( $pageProperties['noindex'] ) ) {
 298                         $pOutput->setIndexPolicy( 'noindex' );
 299                 }
 300                 if ( isset( $pageProperties['index'] ) ) {
 301                         $pOutput->setIndexPolicy( 'index' );
 302                 }
 303
 304                 // Use robot policy logic
 305                 $policy = $this->page->getRobotPolicy( 'view', $pOutput );
 306                 $pageInfo['header-basic'][] = array(
 307                         // Messages: pageinfo-robot-index, pageinfo-robot-noindex
 308                         $this->msg( 'pageinfo-robot-policy' ), $this->msg( "pageinfo-robot-${policy['index']}" )
 309                 );
 310
 311                 $unwatchedPageThreshold = $config->get( 'UnwatchedPageThreshold' );
 312                 if (
 313                         $user->isAllowed( 'unwatchedpages' ) ||
 314                         ( $unwatchedPageThreshold !== false &&
 315                                 $pageCounts['watchers'] >= $unwatchedPageThreshold )
 316                 ) {
 317                         // Number of page watchers
 318                         $pageInfo['header-basic'][] = array(
 319                                 $this->msg( 'pageinfo-watchers' ),
 320                                 $lang->formatNum( $pageCounts['watchers'] )
 321                         );
 322                         if (
 323                                 $config->get( 'ShowUpdatedMarker' ) &&
 324                                 isset( $pageCounts['visitingWatchers'] )
 325                         ) {
 326                                 $minToDisclose = $config->get( 'UnwatchedPageSecret' );
 327                                 if ( $pageCounts['visitingWatchers'] > $minToDisclose ||
 328                                         $user->isAllowed( 'unwatchedpages' ) ) {
 329                                         $pageInfo['header-basic'][] = array(
 330                                                 $this->msg( 'pageinfo-visiting-watchers' ),
 331                                                 $lang->formatNum( $pageCounts['visitingWatchers'] )
 332                                         );
 333                                 } else {
 334                                         $pageInfo['header-basic'][] = array(
 335                                                 $this->msg( 'pageinfo-visiting-watchers' ),
 336                                                 $this->msg( 'pageinfo-few-visiting-watchers' )
 337                                         );
 338                                 }
 339                         }
 340                 } elseif ( $unwatchedPageThreshold !== false ) {
 341                         $pageInfo['header-basic'][] = array(
 342                                 $this->msg( 'pageinfo-watchers' ),
 343                                 $this->msg( 'pageinfo-few-watchers' )->numParams( $unwatchedPageThreshold )
 344                         );
 345                 }
 346
 347                 // Redirects to this page
 348                 $whatLinksHere = SpecialPage::getTitleFor( 'Whatlinkshere', $title->getPrefixedText() );
 349                 $pageInfo['header-basic'][] = array(
 350                         Linker::link(
 351                                 $whatLinksHere,
 352                                 $this->msg( 'pageinfo-redirects-name' )->escaped(),
 353                                 array(),
 354                                 array(
 355                                         'hidelinks' => 1,
 356                                         'hidetrans' => 1,
 357                                         'hideimages' => $title->getNamespace() == NS_FILE
 358                                 )
 359                         ),
 360                         $this->msg( 'pageinfo-redirects-value' )
 361                                 ->numParams( count( $title->getRedirectsHere() ) )
 362                 );
 363
 364                 // Is it counted as a content page?
 365                 if ( $this->page->isCountable() ) {
 366                         $pageInfo['header-basic'][] = array(
 367                                 $this->msg( 'pageinfo-contentpage' ),
 368                                 $this->msg( 'pageinfo-contentpage-yes' )
 369                         );
 370                 }
 371
 372                 // Subpages of this page, if subpages are enabled for the current NS
 373                 if ( MWNamespace::hasSubpages( $title->getNamespace() ) ) {
 374                         $prefixIndex = SpecialPage::getTitleFor( 'Prefixindex', $title->getPrefixedText() . '/' );
 375                         $pageInfo['header-basic'][] = array(
 376                                 Linker::link( $prefixIndex, $this->msg( 'pageinfo-subpages-name' )->escaped() ),
 377                                 $this->msg( 'pageinfo-subpages-value' )
 378                                         ->numParams(
 379                                                 $pageCounts['subpages']['total'],
 380                                                 $pageCounts['subpages']['redirects'],
 381                                                 $pageCounts['subpages']['nonredirects'] )
 382                         );
 383                 }
 384
 385                 if ( $title->inNamespace( NS_CATEGORY ) ) {
 386                         $category = Category::newFromTitle( $title );
 387
 388                         // $allCount is the total number of cat members,
 389                         // not the count of how many members are normal pages.
 390                         $allCount = (int)$category->getPageCount();
 391                         $subcatCount = (int)$category->getSubcatCount();
 392                         $fileCount = (int)$category->getFileCount();
 393                         $pagesCount = $allCount - $subcatCount - $fileCount;
 394
 395                         $pageInfo['category-info'] = array(
 396                                 array(
 397                                         $this->msg( 'pageinfo-category-total' ),
 398                                         $lang->formatNum( $allCount )
 399                                 ),
 400                                 array(
 401                                         $this->msg( 'pageinfo-category-pages' ),
 402                                         $lang->formatNum( $pagesCount )
 403                                 ),
 404                                 array(
 405                                         $this->msg( 'pageinfo-category-subcats' ),
 406                                         $lang->formatNum( $subcatCount )
 407                                 ),
 408                                 array(
 409                                         $this->msg( 'pageinfo-category-files' ),
 410                                         $lang->formatNum( $fileCount )
 411                                 )
 412                         );
 413                 }
 414
 415                 // Page protection
 416                 $pageInfo['header-restrictions'] = array();
 417
 418                 // Is this page affected by the cascading protection of something which includes it?
 419                 if ( $title->isCascadeProtected() ) {
 420                         $cascadingFrom = '';
 421                         $sources = $title->getCascadeProtectionSources(); // Array deferencing is in PHP 5.4 :(
 422
 423                         foreach ( $sources[0] as $sourceTitle ) {
 424                                 $cascadingFrom .= Html::rawElement( 'li', array(), Linker::linkKnown( $sourceTitle ) );
 425                         }
 426
 427                         $cascadingFrom = Html::rawElement( 'ul', array(), $cascadingFrom );
 428                         $pageInfo['header-restrictions'][] = array(
 429                                 $this->msg( 'pageinfo-protect-cascading-from' ),
 430                                 $cascadingFrom
 431                         );
 432                 }
 433
 434                 // Is out protection set to cascade to other pages?
 435                 if ( $title->areRestrictionsCascading() ) {
 436                         $pageInfo['header-restrictions'][] = array(
 437                                 $this->msg( 'pageinfo-protect-cascading' ),
 438                                 $this->msg( 'pageinfo-protect-cascading-yes' )
 439                         );
 440                 }
 441
 442                 // Page protection
 443                 foreach ( $title->getRestrictionTypes() as $restrictionType ) {
 444                         $protectionLevel = implode( ', ', $title->getRestrictions( $restrictionType ) );
 445
 446                         if ( $protectionLevel == '' ) {
 447                                 // Allow all users
 448                                 $message = $this->msg( 'protect-default' )->escaped();
 449                         } else {
 450                                 // Administrators only
 451                                 // Messages: protect-level-autoconfirmed, protect-level-sysop
 452                                 $message = $this->msg( "protect-level-$protectionLevel" );
 453                                 if ( $message->isDisabled() ) {
 454                                         // Require "$1" permission
 455                                         $message = $this->msg( "protect-fallback", $protectionLevel )->parse();
 456                                 } else {
 457                                         $message = $message->escaped();
 458                                 }
 459                         }
 460                         $expiry = $title->getRestrictionExpiry( $restrictionType );
 461                         $formattedexpiry = $this->msg( 'parentheses',
 462                                 $this->getLanguage()->formatExpiry( $expiry ) )->escaped();
 463                         $message .= $this->msg( 'word-separator' )->escaped() . $formattedexpiry;
 464
 465                         // Messages: restriction-edit, restriction-move, restriction-create,
 466                         // restriction-upload
 467                         $pageInfo['header-restrictions'][] = array(
 468                                 $this->msg( "restriction-$restrictionType" ), $message
 469                         );
 470                 }
 471
 472                 if ( !$this->page->exists() ) {
 473                         return $pageInfo;
 474                 }
 475
 476                 // Edit history
 477                 $pageInfo['header-edits'] = array();
 478
 479                 $firstRev = $this->page->getOldestRevision();
 480                 $lastRev = $this->page->getRevision();
 481                 $batch = new LinkBatch;
 482
 483                 if ( $firstRev ) {
 484                         $firstRevUser = $firstRev->getUserText( Revision::FOR_THIS_USER );
 485                         if ( $firstRevUser !== '' ) {
 486                                 $batch->add( NS_USER, $firstRevUser );
 487                                 $batch->add( NS_USER_TALK, $firstRevUser );
 488                         }
 489                 }
 490
 491                 if ( $lastRev ) {
 492                         $lastRevUser = $lastRev->getUserText( Revision::FOR_THIS_USER );
 493                         if ( $lastRevUser !== '' ) {
 494                                 $batch->add( NS_USER, $lastRevUser );
 495                                 $batch->add( NS_USER_TALK, $lastRevUser );
 496                         }
 497                 }
 498
 499                 $batch->execute();
 500
 501                 if ( $firstRev ) {
 502                         // Page creator
 503                         $pageInfo['header-edits'][] = array(
 504                                 $this->msg( 'pageinfo-firstuser' ),
 505                                 Linker::revUserTools( $firstRev )
 506                         );
 507
 508                         // Date of page creation
 509                         $pageInfo['header-edits'][] = array(
 510                                 $this->msg( 'pageinfo-firsttime' ),
 511                                 Linker::linkKnown(
 512                                         $title,
 513                                         htmlspecialchars( $lang->userTimeAndDate( $firstRev->getTimestamp(), $user ) ),
 514                                         array(),
 515                                         array( 'oldid' => $firstRev->getId() )
 516                                 )
 517                         );
 518                 }
 519
 520                 if ( $lastRev ) {
 521                         // Latest editor
 522                         $pageInfo['header-edits'][] = array(
 523                                 $this->msg( 'pageinfo-lastuser' ),
 524                                 Linker::revUserTools( $lastRev )
 525                         );
 526
 527                         // Date of latest edit
 528                         $pageInfo['header-edits'][] = array(
 529                                 $this->msg( 'pageinfo-lasttime' ),
 530                                 Linker::linkKnown(
 531                                         $title,
 532                                         htmlspecialchars( $lang->userTimeAndDate( $this->page->getTimestamp(), $user ) ),
 533                                         array(),
 534                                         array( 'oldid' => $this->page->getLatest() )
 535                                 )
 536                         );
 537                 }
 538
 539                 // Total number of edits
 540                 $pageInfo['header-edits'][] = array(
 541                         $this->msg( 'pageinfo-edits' ), $lang->formatNum( $pageCounts['edits'] )
 542                 );
 543
 544                 // Total number of distinct authors
 545                 if ( $pageCounts['authors'] > 0 ) {
 546                         $pageInfo['header-edits'][] = array(
 547                                 $this->msg( 'pageinfo-authors' ), $lang->formatNum( $pageCounts['authors'] )
 548                         );
 549                 }
 550
 551                 // Recent number of edits (within past 30 days)
 552                 $pageInfo['header-edits'][] = array(
 553                         $this->msg( 'pageinfo-recent-edits', $lang->formatDuration( $config->get( 'RCMaxAge' ) ) ),
 554                         $lang->formatNum( $pageCounts['recent_edits'] )
 555                 );
 556
 557                 // Recent number of distinct authors
 558                 $pageInfo['header-edits'][] = array(
 559                         $this->msg( 'pageinfo-recent-authors' ), $lang->formatNum( $pageCounts['recent_authors'] )
 560                 );
 561
 562                 // Array of MagicWord objects
 563                 $magicWords = MagicWord::getDoubleUnderscoreArray();
 564
 565                 // Array of magic word IDs
 566                 $wordIDs = $magicWords->names;
 567
 568                 // Array of IDs => localized magic words
 569                 $localizedWords = $wgContLang->getMagicWords();
 570
 571                 $listItems = array();
 572                 foreach ( $pageProperties as $property => $value ) {
 573                         if ( in_array( $property, $wordIDs ) ) {
 574                                 $listItems[] = Html::element( 'li', array(), $localizedWords[$property][1] );
 575                         }
 576                 }
 577
 578                 $localizedList = Html::rawElement( 'ul', array(), implode( '', $listItems ) );
 579                 $hiddenCategories = $this->page->getHiddenCategories();
 580
 581                 if (
 582                         count( $listItems ) > 0 ||
 583                         count( $hiddenCategories ) > 0 ||
 584                         $pageCounts['transclusion']['from'] > 0 ||
 585                         $pageCounts['transclusion']['to'] > 0
 586                 ) {
 587                         $options = array( 'LIMIT' => $config->get( 'PageInfoTransclusionLimit' ) );
 588                         $transcludedTemplates = $title->getTemplateLinksFrom( $options );
 589                         if ( $config->get( 'MiserMode' ) ) {
 590                                 $transcludedTargets = array();
 591                         } else {
 592                                 $transcludedTargets = $title->getTemplateLinksTo( $options );
 593                         }
 594
 595                         // Page properties
 596                         $pageInfo['header-properties'] = array();
 597
 598                         // Magic words
 599                         if ( count( $listItems ) > 0 ) {
 600                                 $pageInfo['header-properties'][] = array(
 601                                         $this->msg( 'pageinfo-magic-words' )->numParams( count( $listItems ) ),
 602                                         $localizedList
 603                                 );
 604                         }
 605
 606                         // Hidden categories
 607                         if ( count( $hiddenCategories ) > 0 ) {
 608                                 $pageInfo['header-properties'][] = array(
 609                                         $this->msg( 'pageinfo-hidden-categories' )
 610                                                 ->numParams( count( $hiddenCategories ) ),
 611                                         Linker::formatHiddenCategories( $hiddenCategories )
 612                                 );
 613                         }
 614
 615                         // Transcluded templates
 616                         if ( $pageCounts['transclusion']['from'] > 0 ) {
 617                                 if ( $pageCounts['transclusion']['from'] > count( $transcludedTemplates ) ) {
 618                                         $more = $this->msg( 'morenotlisted' )->escaped();
 619                                 } else {
 620                                         $more = null;
 621                                 }
 622
 623                                 $pageInfo['header-properties'][] = array(
 624                                         $this->msg( 'pageinfo-templates' )
 625                                                 ->numParams( $pageCounts['transclusion']['from'] ),
 626                                         Linker::formatTemplates(
 627                                                 $transcludedTemplates,
 628                                                 false,
 629                                                 false,
 630                                                 $more )
 631                                 );
 632                         }
 633
 634                         if ( !$config->get( 'MiserMode' ) && $pageCounts['transclusion']['to'] > 0 ) {
 635                                 if ( $pageCounts['transclusion']['to'] > count( $transcludedTargets ) ) {
 636                                         $more = Linker::link(
 637                                                 $whatLinksHere,
 638                                                 $this->msg( 'moredotdotdot' )->escaped(),
 639                                                 array(),
 640                                                 array( 'hidelinks' => 1, 'hideredirs' => 1 )
 641                                         );
 642                                 } else {
 643                                         $more = null;
 644                                 }
 645
 646                                 $pageInfo['header-properties'][] = array(
 647                                         $this->msg( 'pageinfo-transclusions' )
 648                                                 ->numParams( $pageCounts['transclusion']['to'] ),
 649                                         Linker::formatTemplates(
 650                                                 $transcludedTargets,
 651                                                 false,
 652                                                 false,
 653                                                 $more )
 654                                 );
 655                         }
 656                 }
 657
 658                 return $pageInfo;
 659         }
 660
 661         /**
 662          * Returns page counts that would be too "expensive" to retrieve by normal means.
 663          *
 664          * @param WikiPage|Article|Page $page
 665          * @return array
 666          */
 667         protected function pageCounts( Page $page ) {
 668                 $fname = __METHOD__;
 669                 $config = $this->context->getConfig();
 670
 671                 return ObjectCache::getMainWANInstance()->getWithSetCallback(
 672                         self::getCacheKey( $page->getTitle(), $page->getLatest() ),
 673                         function ( $oldValue, &$ttl, &$setOpts ) use ( $page, $config, $fname ) {
 674                                 $title = $page->getTitle();
 675                                 $id = $title->getArticleID();
 676
 677                                 $dbrWatchlist = wfGetDB( DB_SLAVE, 'watchlist' );
 678                                 $result = array();
 679
 680                                 // Number of page watchers
 681                                 $watchers = (int)$dbrWatchlist->selectField(
 682                                         'watchlist',
 683                                         'COUNT(*)',
 684                                         array(
 685                                                 'wl_namespace' => $title->getNamespace(),
 686                                                 'wl_title' => $title->getDBkey(),
 687                                         ),
 688                                         $fname
 689                                 );
 690                                 $result['watchers'] = $watchers;
 691
 692                                 if ( $config->get( 'ShowUpdatedMarker' ) ) {
 693                                         // Threshold: last visited about 26 weeks before latest edit
 694                                         $updated = wfTimestamp( TS_UNIX, $page->getTimestamp() );
 695                                         $age = $config->get( 'WatchersMaxAge' );
 696                                         $threshold = $dbrWatchlist->timestamp( $updated - $age );
 697                                         // Number of page watchers who also visited a "recent" edit
 698                                         $visitingWatchers = (int)$dbrWatchlist->selectField(
 699                                                 'watchlist',
 700                                                 'COUNT(*)',
 701                                                 array(
 702                                                         'wl_namespace' => $title->getNamespace(),
 703                                                         'wl_title' => $title->getDBkey(),
 704                                                         'wl_notificationtimestamp >= ' . $dbrWatchlist->addQuotes( $threshold ) .
 705                                                         ' OR wl_notificationtimestamp IS NULL'
 706                                                 ),
 707                                                 $fname
 708                                         );
 709                                         $result['visitingWatchers'] = $visitingWatchers;
 710                                 }
 711
 712                                 $dbr = wfGetDB( DB_SLAVE );
 713                                 // Total number of edits
 714                                 $edits = (int)$dbr->selectField(
 715                                         'revision',
 716                                         'COUNT(*)',
 717                                         array( 'rev_page' => $id ),
 718                                         $fname
 719                                 );
 720                                 $result['edits'] = $edits;
 721
 722                                 // Total number of distinct authors
 723                                 if ( $config->get( 'MiserMode' ) ) {
 724                                         $result['authors'] = 0;
 725                                 } else {
 726                                         $result['authors'] = (int)$dbr->selectField(
 727                                                 'revision',
 728                                                 'COUNT(DISTINCT rev_user_text)',
 729                                                 array( 'rev_page' => $id ),
 730                                                 $fname
 731                                         );
 732                                 }
 733
 734                                 // "Recent" threshold defined by RCMaxAge setting
 735                                 $threshold = $dbr->timestamp( time() - $config->get( 'RCMaxAge' ) );
 736
 737                                 // Recent number of edits
 738                                 $edits = (int)$dbr->selectField(
 739                                         'revision',
 740                                         'COUNT(rev_page)',
 741                                         array(
 742                                                 'rev_page' => $id,
 743                                                 "rev_timestamp >= " . $dbr->addQuotes( $threshold )
 744                                         ),
 745                                         $fname
 746                                 );
 747                                 $result['recent_edits'] = $edits;
 748
 749                                 // Recent number of distinct authors
 750                                 $result['recent_authors'] = (int)$dbr->selectField(
 751                                         'revision',
 752                                         'COUNT(DISTINCT rev_user_text)',
 753                                         array(
 754                                                 'rev_page' => $id,
 755                                                 "rev_timestamp >= " . $dbr->addQuotes( $threshold )
 756                                         ),
 757                                         $fname
 758                                 );
 759
 760                                 // Subpages (if enabled)
 761                                 if ( MWNamespace::hasSubpages( $title->getNamespace() ) ) {
 762                                         $conds = array( 'page_namespace' => $title->getNamespace() );
 763                                         $conds[] = 'page_title ' .
 764                                                 $dbr->buildLike( $title->getDBkey() . '/', $dbr->anyString() );
 765
 766                                         // Subpages of this page (redirects)
 767                                         $conds['page_is_redirect'] = 1;
 768                                         $result['subpages']['redirects'] = (int)$dbr->selectField(
 769                                                 'page',
 770                                                 'COUNT(page_id)',
 771                                                 $conds,
 772                                                 $fname
 773                                         );
 774
 775                                         // Subpages of this page (non-redirects)
 776                                         $conds['page_is_redirect'] = 0;
 777                                         $result['subpages']['nonredirects'] = (int)$dbr->selectField(
 778                                                 'page',
 779                                                 'COUNT(page_id)',
 780                                                 $conds,
 781                                                 $fname
 782                                         );
 783
 784                                         // Subpages of this page (total)
 785                                         $result['subpages']['total'] = $result['subpages']['redirects']
 786                                                 + $result['subpages']['nonredirects'];
 787                                 }
 788
 789                                 // Counts for the number of transclusion links (to/from)
 790                                 if ( $config->get( 'MiserMode' ) ) {
 791                                         $result['transclusion']['to'] = 0;
 792                                 } else {
 793                                         $result['transclusion']['to'] = (int)$dbr->selectField(
 794                                                 'templatelinks',
 795                                                 'COUNT(tl_from)',
 796                                                 array(
 797                                                         'tl_namespace' => $title->getNamespace(),
 798                                                         'tl_title' => $title->getDBkey()
 799                                                 ),
 800                                                 $fname
 801                                         );
 802                                 }
 803
 804                                 $result['transclusion']['from'] = (int)$dbr->selectField(
 805                                         'templatelinks',
 806                                         'COUNT(*)',
 807                                         array( 'tl_from' => $title->getArticleID() ),
 808                                         $fname
 809                                 );
 810
 811                                 $setOpts = array( 'since' => $dbr->trxTimestamp() );
 812
 813                                 return $result;
 814                         },
 815                         86400 * 7
 816                 );
 817         }
 818
 819         /**
 820          * Returns the name that goes in the "<h1>" page title.
 821          *
 822          * @return string
 823          */
 824         protected function getPageTitle() {
 825                 return $this->msg( 'pageinfo-title', $this->getTitle()->getPrefixedText() )->text();
 826         }
 827
 828         /**
 829          * Get a list of contributors of $article
 830          * @return string Html
 831          */
 832         protected function getContributors() {
 833                 $contributors = $this->page->getContributors();
 834                 $real_names = array();
 835                 $user_names = array();
 836                 $anon_ips = array();
 837
 838                 # Sift for real versus user names
 839                 /** @var $user User */
 840                 foreach ( $contributors as $user ) {
 841                         $page = $user->isAnon()
 842                                 ? SpecialPage::getTitleFor( 'Contributions', $user->getName() )
 843                                 : $user->getUserPage();
 844
 845                         $hiddenPrefs = $this->context->getConfig()->get( 'HiddenPrefs' );
 846                         if ( $user->getID() == 0 ) {
 847                                 $anon_ips[] = Linker::link( $page, htmlspecialchars( $user->getName() ) );
 848                         } elseif ( !in_array( 'realname', $hiddenPrefs ) && $user->getRealName() ) {
 849                                 $real_names[] = Linker::link( $page, htmlspecialchars( $user->getRealName() ) );
 850                         } else {
 851                                 $user_names[] = Linker::link( $page, htmlspecialchars( $user->getName() ) );
 852                         }
 853                 }
 854
 855                 $lang = $this->getLanguage();
 856
 857                 $real = $lang->listToText( $real_names );
 858
 859                 # "ThisSite user(s) A, B and C"
 860                 if ( count( $user_names ) ) {
 861                         $user = $this->msg( 'siteusers' )->rawParams( $lang->listToText( $user_names ) )->params(
 862                                 count( $user_names ) )->escaped();
 863                 } else {
 864                         $user = false;
 865                 }
 866
 867                 if ( count( $anon_ips ) ) {
 868                         $anon = $this->msg( 'anonusers' )->rawParams( $lang->listToText( $anon_ips ) )->params(
 869                                 count( $anon_ips ) )->escaped();
 870                 } else {
 871                         $anon = false;
 872                 }
 873
 874                 # This is the big list, all mooshed together. We sift for blank strings
 875                 $fulllist = array();
 876                 foreach ( array( $real, $user, $anon ) as $s ) {
 877                         if ( $s !== '' ) {
 878                                 array_push( $fulllist, $s );
 879                         }
 880                 }
 881
 882                 $count = count( $fulllist );
 883
 884                 # "Based on work by ..."
 885                 return $count
 886                         ? $this->msg( 'othercontribs' )->rawParams(
 887                                 $lang->listToText( $fulllist ) )->params( $count )->escaped()
 888                         : '';
 889         }
 890
 891         /**
 892          * Returns the description that goes below the "<h1>" tag.
 893          *
 894          * @return string
 895          */
 896         protected function getDescription() {
 897                 return '';
 898         }
 899
 900         /**
 901          * @param Title $title
 902          * @param int $revId
 903          * @return string
 904          */
 905         protected static function getCacheKey( Title $title, $revId ) {
 906                 return wfMemcKey( 'infoaction', md5( $title->getPrefixedText() ), $revId, self::VERSION );
 907         }
 908 }