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                 // Language in which the page content is (supposed to be) written
 238                 $pageLang = $title->getPageLanguage()->getCode();
 239                 $pageInfo['header-basic'][] = array( $this->msg( 'pageinfo-language' ),
 240                         Language::fetchLanguageName( $pageLang, $lang->getCode() )
 241                         . ' ' . $this->msg( 'parentheses', $pageLang ) );
 242
 243                 // Search engine status
 244                 $pOutput = new ParserOutput();
 245                 if ( isset( $pageProperties['noindex'] ) ) {
 246                         $pOutput->setIndexPolicy( 'noindex' );
 247                 }
 248
 249                 // Use robot policy logic
 250                 $policy = $this->page->getRobotPolicy( 'view', $pOutput );
 251                 $pageInfo['header-basic'][] = array(
 252                         $this->msg( 'pageinfo-robot-policy' ), $this->msg( "pageinfo-robot-${policy['index']}" )
 253                 );
 254
 255                 if ( isset( $pageCounts['views'] ) ) {
 256                         // Number of views
 257                         $pageInfo['header-basic'][] = array(
 258                                 $this->msg( 'pageinfo-views' ), $lang->formatNum( $pageCounts['views'] )
 259                         );
 260                 }
 261
 262                 if ( isset( $pageCounts['watchers'] ) ) {
 263                         // Number of page watchers
 264                         $pageInfo['header-basic'][] = array(
 265                                 $this->msg( 'pageinfo-watchers' ), $lang->formatNum( $pageCounts['watchers'] )
 266                         );
 267                 }
 268
 269                 // Redirects to this page
 270                 $whatLinksHere = SpecialPage::getTitleFor( 'Whatlinkshere', $title->getPrefixedText() );
 271                 $pageInfo['header-basic'][] = array(
 272                         Linker::link(
 273                                 $whatLinksHere,
 274                                 $this->msg( 'pageinfo-redirects-name' )->escaped(),
 275                                 array(),
 276                                 array( 'hidelinks' => 1, 'hidetrans' => 1 )
 277                         ),
 278                         $this->msg( 'pageinfo-redirects-value' )
 279                                 ->numParams( count( $title->getRedirectsHere() ) )
 280                 );
 281
 282                 // Is it counted as a content page?
 283                 if ( $this->page->isCountable() ) {
 284                         $pageInfo['header-basic'][] = array(
 285                                 $this->msg( 'pageinfo-contentpage' ),
 286                                 $this->msg( 'pageinfo-contentpage-yes' )
 287                         );
 288                 }
 289
 290                 // Subpages of this page, if subpages are enabled for the current NS
 291                 if ( MWNamespace::hasSubpages( $title->getNamespace() ) ) {
 292                         $prefixIndex = SpecialPage::getTitleFor( 'Prefixindex', $title->getPrefixedText() . '/' );
 293                         $pageInfo['header-basic'][] = array(
 294                                 Linker::link( $prefixIndex, $this->msg( 'pageinfo-subpages-name' )->escaped() ),
 295                                 $this->msg( 'pageinfo-subpages-value' )
 296                                         ->numParams(
 297                                                 $pageCounts['subpages']['total'],
 298                                                 $pageCounts['subpages']['redirects'],
 299                                                 $pageCounts['subpages']['nonredirects'] )
 300                         );
 301                 }
 302
 303                 // Page protection
 304                 $pageInfo['header-restrictions'] = array();
 305
 306                 // Is this page effected by the cascading protection of something which includes it?
 307                 if ( $title->isCascadeProtected() ) {
 308                         $cascadingFrom = '';
 309                         $sources = $title->getCascadeProtectionSources(); // Array deferencing is in PHP 5.4 :(
 310
 311                         foreach ( $sources[0] as $sourceTitle ) {
 312                                 $cascadingFrom .= Html::rawElement( 'li', array(), Linker::linkKnown( $sourceTitle ) );
 313                         }
 314
 315                         $cascadingFrom = Html::rawElement( 'ul', array(), $cascadingFrom );
 316                         $pageInfo['header-restrictions'][] = array(
 317                                 $this->msg( 'pageinfo-protect-cascading-from' ),
 318                                 $cascadingFrom
 319                         );
 320                 }
 321
 322                 // Is out protection set to cascade to other pages?
 323                 if ( $title->areRestrictionsCascading() ) {
 324                         $pageInfo['header-restrictions'][] = array(
 325                                 $this->msg( 'pageinfo-protect-cascading' ),
 326                                 $this->msg( 'pageinfo-protect-cascading-yes' )
 327                         );
 328                 }
 329
 330                 // Page protection
 331                 foreach ( $title->getRestrictionTypes() as $restrictionType ) {
 332                         $protectionLevel = implode( ', ', $title->getRestrictions( $restrictionType ) );
 333
 334                         if ( $protectionLevel == '' ) {
 335                                 // Allow all users
 336                                 $message = $this->msg( 'protect-default' )->escaped();
 337                         } else {
 338                                 // Administrators only
 339                                 $message = $this->msg( "protect-level-$protectionLevel" );
 340                                 if ( $message->isDisabled() ) {
 341                                         // Require "$1" permission
 342                                         $message = $this->msg( "protect-fallback", $protectionLevel )->parse();
 343                                 } else {
 344                                         $message = $message->escaped();
 345                                 }
 346                         }
 347
 348                         $pageInfo['header-restrictions'][] = array(
 349                                 $this->msg( "restriction-$restrictionType" ), $message
 350                         );
 351                 }
 352
 353                 if ( !$this->page->exists() ) {
 354                         return $pageInfo;
 355                 }
 356
 357                 // Edit history
 358                 $pageInfo['header-edits'] = array();
 359
 360                 $firstRev = $this->page->getOldestRevision();
 361
 362                 // Page creator
 363                 $pageInfo['header-edits'][] = array(
 364                         $this->msg( 'pageinfo-firstuser' ),
 365                         Linker::revUserTools( $firstRev )
 366                 );
 367
 368                 // Date of page creation
 369                 $pageInfo['header-edits'][] = array(
 370                         $this->msg( 'pageinfo-firsttime' ),
 371                         Linker::linkKnown(
 372                                 $title,
 373                                 $lang->userTimeAndDate( $firstRev->getTimestamp(), $user ),
 374                                 array(),
 375                                 array( 'oldid' => $firstRev->getId() )
 376                         )
 377                 );
 378
 379                 // Latest editor
 380                 $pageInfo['header-edits'][] = array(
 381                         $this->msg( 'pageinfo-lastuser' ),
 382                         Linker::revUserTools( $this->page->getRevision() )
 383                 );
 384
 385                 // Date of latest edit
 386                 $pageInfo['header-edits'][] = array(
 387                         $this->msg( 'pageinfo-lasttime' ),
 388                         Linker::linkKnown(
 389                                 $title,
 390                                 $lang->userTimeAndDate( $this->page->getTimestamp(), $user ),
 391                                 array(),
 392                                 array( 'oldid' => $this->page->getLatest() )
 393                         )
 394                 );
 395
 396                 // Total number of edits
 397                 $pageInfo['header-edits'][] = array(
 398                         $this->msg( 'pageinfo-edits' ), $lang->formatNum( $pageCounts['edits'] )
 399                 );
 400
 401                 // Total number of distinct authors
 402                 $pageInfo['header-edits'][] = array(
 403                         $this->msg( 'pageinfo-authors' ), $lang->formatNum( $pageCounts['authors'] )
 404                 );
 405
 406                 // Recent number of edits (within past 30 days)
 407                 $pageInfo['header-edits'][] = array(
 408                         $this->msg( 'pageinfo-recent-edits', $lang->formatDuration( $wgRCMaxAge ) ),
 409                         $lang->formatNum( $pageCounts['recent_edits'] )
 410                 );
 411
 412                 // Recent number of distinct authors
 413                 $pageInfo['header-edits'][] = array(
 414                         $this->msg( 'pageinfo-recent-authors' ), $lang->formatNum( $pageCounts['recent_authors'] )
 415                 );
 416
 417                 // Array of MagicWord objects
 418                 $magicWords = MagicWord::getDoubleUnderscoreArray();
 419
 420                 // Array of magic word IDs
 421                 $wordIDs = $magicWords->names;
 422
 423                 // Array of IDs => localized magic words
 424                 $localizedWords = $wgContLang->getMagicWords();
 425
 426                 $listItems = array();
 427                 foreach ( $pageProperties as $property => $value ) {
 428                         if ( in_array( $property, $wordIDs ) ) {
 429                                 $listItems[] = Html::element( 'li', array(), $localizedWords[$property][1] );
 430                         }
 431                 }
 432
 433                 $localizedList = Html::rawElement( 'ul', array(), implode( '', $listItems ) );
 434                 $hiddenCategories = $this->page->getHiddenCategories();
 435                 $transcludedTemplates = $title->getTemplateLinksFrom();
 436
 437                 if ( count( $listItems ) > 0
 438                         || count( $hiddenCategories ) > 0
 439                         || count( $transcludedTemplates ) > 0 ) {
 440                         // Page properties
 441                         $pageInfo['header-properties'] = array();
 442
 443                         // Magic words
 444                         if ( count( $listItems ) > 0 ) {
 445                                 $pageInfo['header-properties'][] = array(
 446                                         $this->msg( 'pageinfo-magic-words' )->numParams( count( $listItems ) ),
 447                                         $localizedList
 448                                 );
 449                         }
 450
 451                         // Hidden categories
 452                         if ( count( $hiddenCategories ) > 0 ) {
 453                                 $pageInfo['header-properties'][] = array(
 454                                         $this->msg( 'pageinfo-hidden-categories' )
 455                                                 ->numParams( count( $hiddenCategories ) ),
 456                                         Linker::formatHiddenCategories( $hiddenCategories )
 457                                 );
 458                         }
 459
 460                         // Transcluded templates
 461                         if ( count( $transcludedTemplates ) > 0 ) {
 462                                 $pageInfo['header-properties'][] = array(
 463                                         $this->msg( 'pageinfo-templates' )
 464                                                 ->numParams( count( $transcludedTemplates ) ),
 465                                         Linker::formatTemplates( $transcludedTemplates )
 466                                 );
 467                         }
 468                 }
 469
 470                 return $pageInfo;
 471         }
 472
 473         /**
 474          * Returns page counts that would be too "expensive" to retrieve by normal means.
 475          *
 476          * @param $title Title object
 477          * @param $user User object
 478          * @return array
 479          */
 480         protected static function pageCounts( $title, $user ) {
 481                 global $wgRCMaxAge, $wgDisableCounters;
 482
 483                 wfProfileIn( __METHOD__ );
 484                 $id = $title->getArticleID();
 485
 486                 $dbr = wfGetDB( DB_SLAVE );
 487                 $result = array();
 488
 489                 if ( !$wgDisableCounters ) {
 490                         // Number of views
 491                         $views = (int) $dbr->selectField(
 492                                 'page',
 493                                 'page_counter',
 494                                 array( 'page_id' => $id ),
 495                                 __METHOD__
 496                         );
 497                         $result['views'] = $views;
 498                 }
 499
 500                 if ( $user->isAllowed( 'unwatchedpages' ) ) {
 501                         // Number of page watchers
 502                         $watchers = (int) $dbr->selectField(
 503                                 'watchlist',
 504                                 'COUNT(*)',
 505                                 array(
 506                                         'wl_namespace' => $title->getNamespace(),
 507                                         'wl_title'     => $title->getDBkey(),
 508                                 ),
 509                                 __METHOD__
 510                         );
 511                         $result['watchers'] = $watchers;
 512                 }
 513
 514                 // Total number of edits
 515                 $edits = (int) $dbr->selectField(
 516                         'revision',
 517                         'COUNT(rev_page)',
 518                         array( 'rev_page' => $id ),
 519                         __METHOD__
 520                 );
 521                 $result['edits'] = $edits;
 522
 523                 // Total number of distinct authors
 524                 $authors = (int) $dbr->selectField(
 525                         'revision',
 526                         'COUNT(DISTINCT rev_user_text)',
 527                         array( 'rev_page' => $id ),
 528                         __METHOD__
 529                 );
 530                 $result['authors'] = $authors;
 531
 532                 // "Recent" threshold defined by $wgRCMaxAge
 533                 $threshold = $dbr->timestamp( time() - $wgRCMaxAge );
 534
 535                 // Recent number of edits
 536                 $edits = (int) $dbr->selectField(
 537                         'revision',
 538                         'COUNT(rev_page)',
 539                         array(
 540                                 'rev_page' => $id ,
 541                                 "rev_timestamp >= $threshold"
 542                         ),
 543                         __METHOD__
 544                 );
 545                 $result['recent_edits'] = $edits;
 546
 547                 // Recent number of distinct authors
 548                 $authors = (int) $dbr->selectField(
 549                         'revision',
 550                         'COUNT(DISTINCT rev_user_text)',
 551                         array(
 552                                 'rev_page' => $id,
 553                                 "rev_timestamp >= $threshold"
 554                         ),
 555                         __METHOD__
 556                 );
 557                 $result['recent_authors'] = $authors;
 558
 559                 // Subpages (if enabled)
 560                 if ( MWNamespace::hasSubpages( $title->getNamespace() ) ) {
 561                         $conds = array( 'page_namespace' => $title->getNamespace() );
 562                         $conds[] = 'page_title ' . $dbr->buildLike( $title->getDBkey() . '/', $dbr->anyString() );
 563
 564                         // Subpages of this page (redirects)
 565                         $conds['page_is_redirect'] = 1;
 566                         $result['subpages']['redirects'] = (int) $dbr->selectField(
 567                                 'page',
 568                                 'COUNT(page_id)',
 569                                 $conds,
 570                                 __METHOD__ );
 571
 572                         // Subpages of this page (non-redirects)
 573                         $conds['page_is_redirect'] = 0;
 574                         $result['subpages']['nonredirects'] = (int) $dbr->selectField(
 575                                 'page',
 576                                 'COUNT(page_id)',
 577                                 $conds,
 578                                 __METHOD__
 579                         );
 580
 581                         // Subpages of this page (total)
 582                         $result['subpages']['total'] = $result['subpages']['redirects']
 583                                 + $result['subpages']['nonredirects'];
 584                 }
 585
 586                 wfProfileOut( __METHOD__ );
 587                 return $result;
 588         }
 589
 590         /**
 591          * Returns the name that goes in the "<h1>" page title.
 592          *
 593          * @return string
 594          */
 595         protected function getPageTitle() {
 596                 return $this->msg( 'pageinfo-title', $this->getTitle()->getPrefixedText() )->text();
 597         }
 598
 599         /**
 600          * Get a list of contributors of $article
 601          * @return string: html
 602          */
 603         protected function getContributors() {
 604                 global $wgHiddenPrefs;
 605
 606                 $contributors = $this->page->getContributors();
 607                 $real_names = array();
 608                 $user_names = array();
 609                 $anon_ips = array();
 610
 611                 # Sift for real versus user names
 612                 foreach ( $contributors as $user ) {
 613                         $page = $user->isAnon()
 614                                 ? SpecialPage::getTitleFor( 'Contributions', $user->getName() )
 615                                 : $user->getUserPage();
 616
 617                         if ( $user->getID() == 0 ) {
 618                                 $anon_ips[] = Linker::link( $page, htmlspecialchars( $user->getName() ) );
 619                         } elseif ( !in_array( 'realname', $wgHiddenPrefs ) && $user->getRealName() ) {
 620                                 $real_names[] = Linker::link( $page, htmlspecialchars( $user->getRealName() ) );
 621                         } else {
 622                                 $user_names[] = Linker::link( $page, htmlspecialchars( $user->getName() ) );
 623                         }
 624                 }
 625
 626                 $lang = $this->getLanguage();
 627
 628                 $real = $lang->listToText( $real_names );
 629
 630                 # "ThisSite user(s) A, B and C"
 631                 if ( count( $user_names ) ) {
 632                         $user = $this->msg( 'siteusers' )->rawParams( $lang->listToText( $user_names ) )->params(
 633                                 count( $user_names ) )->escaped();
 634                 } else {
 635                         $user = false;
 636                 }
 637
 638                 if ( count( $anon_ips ) ) {
 639                         $anon = $this->msg( 'anonusers' )->rawParams( $lang->listToText( $anon_ips ) )->params(
 640                                 count( $anon_ips ) )->escaped();
 641                 } else {
 642                         $anon = false;
 643                 }
 644
 645                 # This is the big list, all mooshed together. We sift for blank strings
 646                 $fulllist = array();
 647                 foreach ( array( $real, $user, $anon ) as $s ) {
 648                         if ( $s !== '' ) {
 649                                 array_push( $fulllist, $s );
 650                         }
 651                 }
 652
 653                 $count = count( $fulllist );
 654                 # "Based on work by ..."
 655                 return $count
 656                         ? $this->msg( 'othercontribs' )->rawParams(
 657                                 $lang->listToText( $fulllist ) )->params( $count )->escaped()
 658                         : '';
 659         }
 660
 661         /**
 662          * Returns the description that goes below the "<h1>" tag.
 663          *
 664          * @return string
 665          */
 666         protected function getDescription() {
 667                 return '';
 668         }
 669 }