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 class InfoAction extends FormlessAction {
  26         /**
  27          * Returns the name of the action this object responds to.
  28          *
  29          * @return string lowercase
  30          */
  31         public function getName() {
  32                 return 'info';
  33         }
  34
  35         /**
  36          * Whether this action can still be executed by a blocked user.
  37          *
  38          * @return bool
  39          */
  40         public function requiresUnblock() {
  41                 return false;
  42         }
  43
  44         /**
  45          * Whether this action requires the wiki not to be locked.
  46          *
  47          * @return bool
  48          */
  49         public function requiresWrite() {
  50                 return false;
  51         }
  52
  53         /**
  54          * Shows page information on GET request.
  55          *
  56          * @return string Page information that will be added to the output
  57          */
  58         public function onView() {
  59                 $content = '';
  60
  61                 // Validate revision
  62                 $oldid = $this->page->getOldID();
  63                 if ( $oldid ) {
  64                         $revision = $this->page->getRevisionFetched();
  65
  66                         // Revision is missing
  67                         if ( $revision === null ) {
  68                                 return $this->msg( 'missing-revision', $oldid )->parse();
  69                         }
  70
  71                         // Revision is not current
  72                         if ( !$revision->isCurrent() ) {
  73                                 return $this->msg( 'pageinfo-not-current' )->plain();
  74                         }
  75                 }
  76
  77                 // Page header
  78                 if ( !$this->msg( 'pageinfo-header' )->isDisabled() ) {
  79                         $content .= $this->msg( 'pageinfo-header' )->parse();
  80                 }
  81
  82                 // Hide "This page is a member of # hidden categories" explanation
  83                 $content .= Html::element( 'style', array(),
  84                         '.mw-hiddenCategoriesExplanation { display: none; }' );
  85
  86                 // Hide "Templates used on this page" explanation
  87                 $content .= Html::element( 'style', array(),
  88                         '.mw-templatesUsedExplanation { display: none; }' );
  89
  90                 // Get page information
  91                 $pageInfo = $this->pageInfo();
  92
  93                 // Allow extensions to add additional information
  94                 wfRunHooks( 'InfoAction', array( $this->getContext(), &$pageInfo ) );
  95
  96                 // Render page information
  97                 foreach ( $pageInfo as $header => $infoTable ) {
  98                         $content .= $this->makeHeader( $this->msg( "pageinfo-${header}" )->escaped() );
  99                         $table = '';
 100                         foreach ( $infoTable as $infoRow ) {
 101                                 $name = ( $infoRow[0] instanceof Message ) ? $infoRow[0]->escaped() : $infoRow[0];
 102                                 $value = ( $infoRow[1] instanceof Message ) ? $infoRow[1]->escaped() : $infoRow[1];
 103                                 $table = $this->addRow( $table, $name, $value );
 104                         }
 105                         $content = $this->addTable( $content, $table );
 106                 }
 107
 108                 // Page footer
 109                 if ( !$this->msg( 'pageinfo-footer' )->isDisabled() ) {
 110                         $content .= $this->msg( 'pageinfo-footer' )->parse();
 111                 }
 112
 113                 // Page credits
 114                 /*if ( $this->page->exists() ) {
 115                         $content .= Html::rawElement( 'div', array( 'id' => 'mw-credits' ), $this->getContributors() );
 116                 }*/
 117
 118                 return $content;
 119         }
 120
 121         /**
 122          * Creates a header that can be added to the output.
 123          *
 124          * @param $header The header text.
 125          * @return string The HTML.
 126          */
 127         protected function makeHeader( $header ) {
 128                 global $wgParser;
 129                 $spanAttribs = array( 'class' => 'mw-headline', 'id' => $wgParser->guessSectionNameFromWikiText( $header ) );
 130                 return Html::rawElement( 'h2', array(), Html::element( 'span', $spanAttribs, $header ) );
 131         }
 132
 133         /**
 134          * Adds a row to a table that will be added to the content.
 135          *
 136          * @param $table string The table that will be added to the content
 137          * @param $name string The name of the row
 138          * @param $value string The value of the row
 139          * @return string The table with the row added
 140          */
 141         protected function addRow( $table, $name, $value ) {
 142                 return $table . Html::rawElement( 'tr', array(),
 143                         Html::rawElement( 'td', array( 'style' => 'vertical-align: top;' ), $name ) .
 144                         Html::rawElement( 'td', array(), $value )
 145                 );
 146         }
 147
 148         /**
 149          * Adds a table to the content that will be added to the output.
 150          *
 151          * @param $content string The content that will be added to the output
 152          * @param $table string The table
 153          * @return string The content with the table added
 154          */
 155         protected function addTable( $content, $table ) {
 156                 return $content . Html::rawElement( 'table', array( 'class' => 'wikitable mw-page-info' ),
 157                         $table );
 158         }
 159
 160         /**
 161          * Returns page information in an easily-manipulated format. Array keys are used so extensions
 162          * may add additional information in arbitrary positions. Array values are arrays with one
 163          * element to be rendered as a header, arrays with two elements to be rendered as a table row.
 164          *
 165          * @return array
 166          */
 167         protected function pageInfo() {
 168                 global $wgContLang, $wgRCMaxAge;
 169
 170                 $user = $this->getUser();
 171                 $lang = $this->getLanguage();
 172                 $title = $this->getTitle();
 173                 $id = $title->getArticleID();
 174
 175                 // Get page information that would be too "expensive" to retrieve by normal means
 176                 $pageCounts = self::pageCounts( $title, $user );
 177
 178                 // Get page properties
 179                 $dbr = wfGetDB( DB_SLAVE );
 180                 $result = $dbr->select(
 181                         'page_props',
 182                         array( 'pp_propname', 'pp_value' ),
 183                         array( 'pp_page' => $id ),
 184                         __METHOD__
 185                 );
 186
 187                 $pageProperties = array();
 188                 foreach ( $result as $row ) {
 189                         $pageProperties[$row->pp_propname] = $row->pp_value;
 190                 }
 191
 192                 // Basic information
 193                 $pageInfo = array();
 194                 $pageInfo['header-basic'] = array();
 195
 196                 // Display title
 197                 $displayTitle = $title->getPrefixedText();
 198                 if ( !empty( $pageProperties['displaytitle'] ) ) {
 199                         $displayTitle = $pageProperties['displaytitle'];
 200                 }
 201
 202                 $pageInfo['header-basic'][] = array(
 203                         $this->msg( 'pageinfo-display-title' ), $displayTitle
 204                 );
 205
 206                 // Is it a redirect? If so, where to?
 207                 if ( $title->isRedirect() ) {
 208                         $pageInfo['header-basic'][] = array(
 209                                 $this->msg( 'pageinfo-redirectsto' ),
 210                                 Linker::link( $this->page->getRedirectTarget() ) .
 211                                 $this->msg( 'word-separator' )->text() .
 212                                 $this->msg( 'parentheses', Linker::link(
 213                                         $this->page->getRedirectTarget(),
 214                                         $this->msg( 'pageinfo-redirectsto-info' )->escaped(),
 215                                         array(),
 216                                         array( 'action' => 'info' )
 217                                 ) )->text()
 218                         );
 219                 }
 220
 221                 // Default sort key
 222                 $sortKey = $title->getCategorySortKey();
 223                 if ( !empty( $pageProperties['defaultsort'] ) ) {
 224                         $sortKey = $pageProperties['defaultsort'];
 225                 }
 226
 227                 $pageInfo['header-basic'][] = array( $this->msg( 'pageinfo-default-sort' ), $sortKey );
 228
 229                 // Page length (in bytes)
 230                 $pageInfo['header-basic'][] = array(
 231                         $this->msg( 'pageinfo-length' ), $lang->formatNum( $title->getLength() )
 232                 );
 233
 234                 // Page ID (number not localised, as it's a database ID)
 235                 $pageInfo['header-basic'][] = array( $this->msg( 'pageinfo-article-id' ), $id );
 236
 237                 // Search engine status
 238                 $pOutput = new ParserOutput();
 239                 if ( isset( $pageProperties['noindex'] ) ) {
 240                         $pOutput->setIndexPolicy( 'noindex' );
 241                 }
 242
 243                 // Use robot policy logic
 244                 $policy = $this->page->getRobotPolicy( 'view', $pOutput );
 245                 $pageInfo['header-basic'][] = array(
 246                         $this->msg( 'pageinfo-robot-policy' ), $this->msg( "pageinfo-robot-${policy['index']}" )
 247                 );
 248
 249                 if ( isset( $pageCounts['views'] ) ) {
 250                         // Number of views
 251                         $pageInfo['header-basic'][] = array(
 252                                 $this->msg( 'pageinfo-views' ), $lang->formatNum( $pageCounts['views'] )
 253                         );
 254                 }
 255
 256                 if ( isset( $pageCounts['watchers'] ) ) {
 257                         // Number of page watchers
 258                         $pageInfo['header-basic'][] = array(
 259                                 $this->msg( 'pageinfo-watchers' ), $lang->formatNum( $pageCounts['watchers'] )
 260                         );
 261                 }
 262
 263                 // Redirects to this page
 264                 $whatLinksHere = SpecialPage::getTitleFor( 'Whatlinkshere', $title->getPrefixedText() );
 265                 $pageInfo['header-basic'][] = array(
 266                         Linker::link(
 267                                 $whatLinksHere,
 268                                 $this->msg( 'pageinfo-redirects-name' )->escaped(),
 269                                 array(),
 270                                 array( 'hidelinks' => 1, 'hidetrans' => 1 )
 271                         ),
 272                         $this->msg( 'pageinfo-redirects-value' )
 273                                 ->numParams( count( $title->getRedirectsHere() ) )
 274                 );
 275
 276                 // Is it counted as a content page?
 277                 if ( $this->page->isCountable() ) {
 278                         $pageInfo['header-basic'][] = array(
 279                                 $this->msg( 'pageinfo-contentpage' ),
 280                                 $this->msg( 'pageinfo-contentpage-yes' )
 281                         );
 282                 }
 283
 284                 // Subpages of this page, if subpages are enabled for the current NS
 285                 if ( MWNamespace::hasSubpages( $title->getNamespace() ) ) {
 286                         $prefixIndex = SpecialPage::getTitleFor( 'Prefixindex', $title->getPrefixedText() . '/' );
 287                         $pageInfo['header-basic'][] = array(
 288                                 Linker::link( $prefixIndex, $this->msg( 'pageinfo-subpages-name' )->escaped() ),
 289                                 $this->msg( 'pageinfo-subpages-value' )
 290                                         ->numParams(
 291                                                 $pageCounts['subpages']['total'],
 292                                                 $pageCounts['subpages']['redirects'],
 293                                                 $pageCounts['subpages']['nonredirects'] )
 294                         );
 295                 }
 296
 297                 // Page protection
 298                 $pageInfo['header-restrictions'] = array();
 299
 300                 // Is this page effected by the cascading protection of something which includes it?
 301                 if ( $title->isCascadeProtected() ) {
 302                         $cascadingFrom = '';
 303                         $sources = $title->getCascadeProtectionSources(); // Array deferencing is in PHP 5.4 :(
 304
 305                         foreach ( $sources[0] as $sourceTitle ) {
 306                                 $cascadingFrom .= Html::rawElement( 'li', array(), Linker::linkKnown( $sourceTitle ) );
 307                         }
 308
 309                         $cascadingFrom = Html::rawElement( 'ul', array(), $cascadingFrom );
 310                         $pageInfo['header-restrictions'][] = array(
 311                                 $this->msg( 'pageinfo-protect-cascading-from' ),
 312                                 $cascadingFrom
 313                         );
 314                 }
 315
 316                 // Is out protection set to cascade to other pages?
 317                 if ( $title->areRestrictionsCascading() ) {
 318                         $pageInfo['header-restrictions'][] = array(
 319                                 $this->msg( 'pageinfo-protect-cascading' ),
 320                                 $this->msg( 'pageinfo-protect-cascading-yes' )
 321                         );
 322                 }
 323
 324                 // Page protection
 325                 foreach ( $title->getRestrictionTypes() as $restrictionType ) {
 326                         $protectionLevel = implode( ', ', $title->getRestrictions( $restrictionType ) );
 327
 328                         if ( $protectionLevel == '' ) {
 329                                 // Allow all users
 330                                 $message = $this->msg( 'protect-default' )->escaped();
 331                         } else {
 332                                 // Administrators only
 333                                 $message = $this->msg( "protect-level-$protectionLevel" );
 334                                 if ( $message->isDisabled() ) {
 335                                         // Require "$1" permission
 336                                         $message = $this->msg( "protect-fallback", $protectionLevel )->parse();
 337                                 } else {
 338                                         $message = $message->escaped();
 339                                 }
 340                         }
 341
 342                         $pageInfo['header-restrictions'][] = array(
 343                                 $this->msg( "restriction-$restrictionType" ), $message
 344                         );
 345                 }
 346
 347                 if ( !$this->page->exists() ) {
 348                         return $pageInfo;
 349                 }
 350
 351                 // Edit history
 352                 $pageInfo['header-edits'] = array();
 353
 354                 $firstRev = $this->page->getOldestRevision();
 355
 356                 // Page creator
 357                 $pageInfo['header-edits'][] = array(
 358                         $this->msg( 'pageinfo-firstuser' ),
 359                         Linker::revUserTools( $firstRev )
 360                 );
 361
 362                 // Date of page creation
 363                 $pageInfo['header-edits'][] = array(
 364                         $this->msg( 'pageinfo-firsttime' ),
 365                         Linker::linkKnown(
 366                                 $title,
 367                                 $lang->userTimeAndDate( $firstRev->getTimestamp(), $user ),
 368                                 array(),
 369                                 array( 'oldid' => $firstRev->getId() )
 370                         )
 371                 );
 372
 373                 // Latest editor
 374                 $pageInfo['header-edits'][] = array(
 375                         $this->msg( 'pageinfo-lastuser' ),
 376                         Linker::revUserTools( $this->page->getRevision() )
 377                 );
 378
 379                 // Date of latest edit
 380                 $pageInfo['header-edits'][] = array(
 381                         $this->msg( 'pageinfo-lasttime' ),
 382                         Linker::linkKnown(
 383                                 $title,
 384                                 $lang->userTimeAndDate( $this->page->getTimestamp(), $user ),
 385                                 array(),
 386                                 array( 'oldid' => $this->page->getLatest() )
 387                         )
 388                 );
 389
 390                 // Total number of edits
 391                 $pageInfo['header-edits'][] = array(
 392                         $this->msg( 'pageinfo-edits' ), $lang->formatNum( $pageCounts['edits'] )
 393                 );
 394
 395                 // Total number of distinct authors
 396                 $pageInfo['header-edits'][] = array(
 397                         $this->msg( 'pageinfo-authors' ), $lang->formatNum( $pageCounts['authors'] )
 398                 );
 399
 400                 // Recent number of edits (within past 30 days)
 401                 $pageInfo['header-edits'][] = array(
 402                         $this->msg( 'pageinfo-recent-edits', $lang->formatDuration( $wgRCMaxAge ) ),
 403                         $lang->formatNum( $pageCounts['recent_edits'] )
 404                 );
 405
 406                 // Recent number of distinct authors
 407                 $pageInfo['header-edits'][] = array(
 408                         $this->msg( 'pageinfo-recent-authors' ), $lang->formatNum( $pageCounts['recent_authors'] )
 409                 );
 410
 411                 // Array of MagicWord objects
 412                 $magicWords = MagicWord::getDoubleUnderscoreArray();
 413
 414                 // Array of magic word IDs
 415                 $wordIDs = $magicWords->names;
 416
 417                 // Array of IDs => localized magic words
 418                 $localizedWords = $wgContLang->getMagicWords();
 419
 420                 $listItems = array();
 421                 foreach ( $pageProperties as $property => $value ) {
 422                         if ( in_array( $property, $wordIDs ) ) {
 423                                 $listItems[] = Html::element( 'li', array(), $localizedWords[$property][1] );
 424                         }
 425                 }
 426
 427                 $localizedList = Html::rawElement( 'ul', array(), implode( '', $listItems ) );
 428                 $hiddenCategories = $this->page->getHiddenCategories();
 429                 $transcludedTemplates = $title->getTemplateLinksFrom();
 430
 431                 if ( count( $listItems ) > 0
 432                         || count( $hiddenCategories ) > 0
 433                         || count( $transcludedTemplates ) > 0 ) {
 434                         // Page properties
 435                         $pageInfo['header-properties'] = array();
 436
 437                         // Magic words
 438                         if ( count( $listItems ) > 0 ) {
 439                                 $pageInfo['header-properties'][] = array(
 440                                         $this->msg( 'pageinfo-magic-words' )->numParams( count( $listItems ) ),
 441                                         $localizedList
 442                                 );
 443                         }
 444
 445                         // Hidden categories
 446                         if ( count( $hiddenCategories ) > 0 ) {
 447                                 $pageInfo['header-properties'][] = array(
 448                                         $this->msg( 'pageinfo-hidden-categories' )
 449                                                 ->numParams( count( $hiddenCategories ) ),
 450                                         Linker::formatHiddenCategories( $hiddenCategories )
 451                                 );
 452                         }
 453
 454                         // Transcluded templates
 455                         if ( count( $transcludedTemplates ) > 0 ) {
 456                                 $pageInfo['header-properties'][] = array(
 457                                         $this->msg( 'pageinfo-templates' )
 458                                                 ->numParams( count( $transcludedTemplates ) ),
 459                                         Linker::formatTemplates( $transcludedTemplates )
 460                                 );
 461                         }
 462                 }
 463
 464                 return $pageInfo;
 465         }
 466
 467         /**
 468          * Returns page counts that would be too "expensive" to retrieve by normal means.
 469          *
 470          * @param $title Title object
 471          * @param $user User object
 472          * @return array
 473          */
 474         protected static function pageCounts( $title, $user ) {
 475                 global $wgRCMaxAge, $wgDisableCounters;
 476
 477                 wfProfileIn( __METHOD__ );
 478                 $id = $title->getArticleID();
 479
 480                 $dbr = wfGetDB( DB_SLAVE );
 481                 $result = array();
 482
 483                 if ( !$wgDisableCounters ) {
 484                         // Number of views
 485                         $views = (int) $dbr->selectField(
 486                                 'page',
 487                                 'page_counter',
 488                                 array( 'page_id' => $id ),
 489                                 __METHOD__
 490                         );
 491                         $result['views'] = $views;
 492                 }
 493
 494                 if ( $user->isAllowed( 'unwatchedpages' ) ) {
 495                         // Number of page watchers
 496                         $watchers = (int) $dbr->selectField(
 497                                 'watchlist',
 498                                 'COUNT(*)',
 499                                 array(
 500                                         'wl_namespace' => $title->getNamespace(),
 501                                         'wl_title'     => $title->getDBkey(),
 502                                 ),
 503                                 __METHOD__
 504                         );
 505                         $result['watchers'] = $watchers;
 506                 }
 507
 508                 // Total number of edits
 509                 $edits = (int) $dbr->selectField(
 510                         'revision',
 511                         'COUNT(rev_page)',
 512                         array( 'rev_page' => $id ),
 513                         __METHOD__
 514                 );
 515                 $result['edits'] = $edits;
 516
 517                 // Total number of distinct authors
 518                 $authors = (int) $dbr->selectField(
 519                         'revision',
 520                         'COUNT(DISTINCT rev_user_text)',
 521                         array( 'rev_page' => $id ),
 522                         __METHOD__
 523                 );
 524                 $result['authors'] = $authors;
 525
 526                 // "Recent" threshold defined by $wgRCMaxAge
 527                 $threshold = $dbr->timestamp( time() - $wgRCMaxAge );
 528
 529                 // Recent number of edits
 530                 $edits = (int) $dbr->selectField(
 531                         'revision',
 532                         'COUNT(rev_page)',
 533                         array(
 534                                 'rev_page' => $id ,
 535                                 "rev_timestamp >= $threshold"
 536                         ),
 537                         __METHOD__
 538                 );
 539                 $result['recent_edits'] = $edits;
 540
 541                 // Recent number of distinct authors
 542                 $authors = (int) $dbr->selectField(
 543                         'revision',
 544                         'COUNT(DISTINCT rev_user_text)',
 545                         array(
 546                                 'rev_page' => $id,
 547                                 "rev_timestamp >= $threshold"
 548                         ),
 549                         __METHOD__
 550                 );
 551                 $result['recent_authors'] = $authors;
 552
 553                 // Subpages (if enabled)
 554                 if ( MWNamespace::hasSubpages( $title->getNamespace() ) ) {
 555                         $conds = array( 'page_namespace' => $title->getNamespace() );
 556                         $conds[] = 'page_title ' . $dbr->buildLike( $title->getDBkey() . '/', $dbr->anyString() );
 557
 558                         // Subpages of this page (redirects)
 559                         $conds['page_is_redirect'] = 1;
 560                         $result['subpages']['redirects'] = (int) $dbr->selectField(
 561                                 'page',
 562                                 'COUNT(page_id)',
 563                                 $conds,
 564                                 __METHOD__ );
 565
 566                         // Subpages of this page (non-redirects)
 567                         $conds['page_is_redirect'] = 0;
 568                         $result['subpages']['nonredirects'] = (int) $dbr->selectField(
 569                                 'page',
 570                                 'COUNT(page_id)',
 571                                 $conds,
 572                                 __METHOD__
 573                         );
 574
 575                         // Subpages of this page (total)
 576                         $result['subpages']['total'] = $result['subpages']['redirects']
 577                                 + $result['subpages']['nonredirects'];
 578                 }
 579
 580                 wfProfileOut( __METHOD__ );
 581                 return $result;
 582         }
 583
 584         /**
 585          * Returns the name that goes in the "<h1>" page title.
 586          *
 587          * @return string
 588          */
 589         protected function getPageTitle() {
 590                 return $this->msg( 'pageinfo-title', $this->getTitle()->getPrefixedText() )->text();
 591         }
 592
 593         /**
 594          * Get a list of contributors of $article
 595          * @return string: html
 596          */
 597         protected function getContributors() {
 598                 global $wgHiddenPrefs;
 599
 600                 $contributors = $this->page->getContributors();
 601                 $real_names = array();
 602                 $user_names = array();
 603                 $anon_ips = array();
 604
 605                 # Sift for real versus user names
 606                 foreach ( $contributors as $user ) {
 607                         $page = $user->isAnon()
 608                                 ? SpecialPage::getTitleFor( 'Contributions', $user->getName() )
 609                                 : $user->getUserPage();
 610
 611                         if ( $user->getID() == 0 ) {
 612                                 $anon_ips[] = Linker::link( $page, htmlspecialchars( $user->getName() ) );
 613                         } elseif ( !in_array( 'realname', $wgHiddenPrefs ) && $user->getRealName() ) {
 614                                 $real_names[] = Linker::link( $page, htmlspecialchars( $user->getRealName() ) );
 615                         } else {
 616                                 $user_names[] = Linker::link( $page, htmlspecialchars( $user->getName() ) );
 617                         }
 618                 }
 619
 620                 $lang = $this->getLanguage();
 621
 622                 $real = $lang->listToText( $real_names );
 623
 624                 # "ThisSite user(s) A, B and C"
 625                 if ( count( $user_names ) ) {
 626                         $user = $this->msg( 'siteusers' )->rawParams( $lang->listToText( $user_names ) )->params(
 627                                 count( $user_names ) )->escaped();
 628                 } else {
 629                         $user = false;
 630                 }
 631
 632                 if ( count( $anon_ips ) ) {
 633                         $anon = $this->msg( 'anonusers' )->rawParams( $lang->listToText( $anon_ips ) )->params(
 634                                 count( $anon_ips ) )->escaped();
 635                 } else {
 636                         $anon = false;
 637                 }
 638
 639                 # This is the big list, all mooshed together. We sift for blank strings
 640                 $fulllist = array();
 641                 foreach ( array( $real, $user, $anon ) as $s ) {
 642                         if ( $s !== '' ) {
 643                                 array_push( $fulllist, $s );
 644                         }
 645                 }
 646
 647                 $count = count( $fulllist );
 648                 # "Based on work by ..."
 649                 return $count
 650                         ? $this->msg( 'othercontribs' )->rawParams(
 651                                 $lang->listToText( $fulllist ) )->params( $count )->escaped()
 652                         : '';
 653         }
 654
 655         /**
 656          * Returns the description that goes below the "<h1>" tag.
 657          *
 658          * @return string
 659          */
 660         protected function getDescription() {
 661                 return '';
 662         }
 663 }