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, $wgMemc;
 169
 170                 $user = $this->getUser();
 171                 $lang = $this->getLanguage();
 172                 $title = $this->getTitle();
 173                 $id = $title->getArticleID();
 174
 175                 $memcKey = wfMemcKey( 'infoaction', $title->getPrefixedText(), $this->page->getRevision()->getId() );
 176                 $pageCounts = $wgMemc->get( $memcKey );
 177                 if ( $pageCounts === false ) {
 178                         // Get page information that would be too "expensive" to retrieve by normal means
 179                         $pageCounts = self::pageCounts( $title );
 180
 181                         $wgMemc->set( $memcKey, $pageCounts );
 182                 }
 183
 184                 // Get page properties
 185                 $dbr = wfGetDB( DB_SLAVE );
 186                 $result = $dbr->select(
 187                         'page_props',
 188                         array( 'pp_propname', 'pp_value' ),
 189                         array( 'pp_page' => $id ),
 190                         __METHOD__
 191                 );
 192
 193                 $pageProperties = array();
 194                 foreach ( $result as $row ) {
 195                         $pageProperties[$row->pp_propname] = $row->pp_value;
 196                 }
 197
 198                 // Basic information
 199                 $pageInfo = array();
 200                 $pageInfo['header-basic'] = array();
 201
 202                 // Display title
 203                 $displayTitle = $title->getPrefixedText();
 204                 if ( !empty( $pageProperties['displaytitle'] ) ) {
 205                         $displayTitle = $pageProperties['displaytitle'];
 206                 }
 207
 208                 $pageInfo['header-basic'][] = array(
 209                         $this->msg( 'pageinfo-display-title' ), $displayTitle
 210                 );
 211
 212                 // Is it a redirect? If so, where to?
 213                 if ( $title->isRedirect() ) {
 214                         $pageInfo['header-basic'][] = array(
 215                                 $this->msg( 'pageinfo-redirectsto' ),
 216                                 Linker::link( $this->page->getRedirectTarget() ) .
 217                                 $this->msg( 'word-separator' )->text() .
 218                                 $this->msg( 'parentheses', Linker::link(
 219                                         $this->page->getRedirectTarget(),
 220                                         $this->msg( 'pageinfo-redirectsto-info' )->escaped(),
 221                                         array(),
 222                                         array( 'action' => 'info' )
 223                                 ) )->text()
 224                         );
 225                 }
 226
 227                 // Default sort key
 228                 $sortKey = $title->getCategorySortKey();
 229                 if ( !empty( $pageProperties['defaultsort'] ) ) {
 230                         $sortKey = $pageProperties['defaultsort'];
 231                 }
 232
 233                 $pageInfo['header-basic'][] = array( $this->msg( 'pageinfo-default-sort' ), $sortKey );
 234
 235                 // Page length (in bytes)
 236                 $pageInfo['header-basic'][] = array(
 237                         $this->msg( 'pageinfo-length' ), $lang->formatNum( $title->getLength() )
 238                 );
 239
 240                 // Page ID (number not localised, as it's a database ID)
 241                 $pageInfo['header-basic'][] = array( $this->msg( 'pageinfo-article-id' ), $id );
 242
 243                 // Language in which the page content is (supposed to be) written
 244                 $pageLang = $title->getPageLanguage()->getCode();
 245                 $pageInfo['header-basic'][] = array( $this->msg( 'pageinfo-language' ),
 246                         Language::fetchLanguageName( $pageLang, $lang->getCode() )
 247                         . ' ' . $this->msg( 'parentheses', $pageLang ) );
 248
 249                 // Search engine status
 250                 $pOutput = new ParserOutput();
 251                 if ( isset( $pageProperties['noindex'] ) ) {
 252                         $pOutput->setIndexPolicy( 'noindex' );
 253                 }
 254
 255                 // Use robot policy logic
 256                 $policy = $this->page->getRobotPolicy( 'view', $pOutput );
 257                 $pageInfo['header-basic'][] = array(
 258                         $this->msg( 'pageinfo-robot-policy' ), $this->msg( "pageinfo-robot-${policy['index']}" )
 259                 );
 260
 261                 if ( isset( $pageCounts['views'] ) ) {
 262                         // Number of views
 263                         $pageInfo['header-basic'][] = array(
 264                                 $this->msg( 'pageinfo-views' ), $lang->formatNum( $pageCounts['views'] )
 265                         );
 266                 }
 267
 268                 if ( $user->isAllowed( 'unwatchedpages' ) ) {
 269                         // Number of page watchers
 270                         $pageInfo['header-basic'][] = array(
 271                                 $this->msg( 'pageinfo-watchers' ), $lang->formatNum( $pageCounts['watchers'] )
 272                         );
 273                 }
 274
 275                 // Redirects to this page
 276                 $whatLinksHere = SpecialPage::getTitleFor( 'Whatlinkshere', $title->getPrefixedText() );
 277                 $pageInfo['header-basic'][] = array(
 278                         Linker::link(
 279                                 $whatLinksHere,
 280                                 $this->msg( 'pageinfo-redirects-name' )->escaped(),
 281                                 array(),
 282                                 array( 'hidelinks' => 1, 'hidetrans' => 1 )
 283                         ),
 284                         $this->msg( 'pageinfo-redirects-value' )
 285                                 ->numParams( count( $title->getRedirectsHere() ) )
 286                 );
 287
 288                 // Is it counted as a content page?
 289                 if ( $this->page->isCountable() ) {
 290                         $pageInfo['header-basic'][] = array(
 291                                 $this->msg( 'pageinfo-contentpage' ),
 292                                 $this->msg( 'pageinfo-contentpage-yes' )
 293                         );
 294                 }
 295
 296                 // Subpages of this page, if subpages are enabled for the current NS
 297                 if ( MWNamespace::hasSubpages( $title->getNamespace() ) ) {
 298                         $prefixIndex = SpecialPage::getTitleFor( 'Prefixindex', $title->getPrefixedText() . '/' );
 299                         $pageInfo['header-basic'][] = array(
 300                                 Linker::link( $prefixIndex, $this->msg( 'pageinfo-subpages-name' )->escaped() ),
 301                                 $this->msg( 'pageinfo-subpages-value' )
 302                                         ->numParams(
 303                                                 $pageCounts['subpages']['total'],
 304                                                 $pageCounts['subpages']['redirects'],
 305                                                 $pageCounts['subpages']['nonredirects'] )
 306                         );
 307                 }
 308
 309                 // Page protection
 310                 $pageInfo['header-restrictions'] = array();
 311
 312                 // Is this page effected by the cascading protection of something which includes it?
 313                 if ( $title->isCascadeProtected() ) {
 314                         $cascadingFrom = '';
 315                         $sources = $title->getCascadeProtectionSources(); // Array deferencing is in PHP 5.4 :(
 316
 317                         foreach ( $sources[0] as $sourceTitle ) {
 318                                 $cascadingFrom .= Html::rawElement( 'li', array(), Linker::linkKnown( $sourceTitle ) );
 319                         }
 320
 321                         $cascadingFrom = Html::rawElement( 'ul', array(), $cascadingFrom );
 322                         $pageInfo['header-restrictions'][] = array(
 323                                 $this->msg( 'pageinfo-protect-cascading-from' ),
 324                                 $cascadingFrom
 325                         );
 326                 }
 327
 328                 // Is out protection set to cascade to other pages?
 329                 if ( $title->areRestrictionsCascading() ) {
 330                         $pageInfo['header-restrictions'][] = array(
 331                                 $this->msg( 'pageinfo-protect-cascading' ),
 332                                 $this->msg( 'pageinfo-protect-cascading-yes' )
 333                         );
 334                 }
 335
 336                 // Page protection
 337                 foreach ( $title->getRestrictionTypes() as $restrictionType ) {
 338                         $protectionLevel = implode( ', ', $title->getRestrictions( $restrictionType ) );
 339
 340                         if ( $protectionLevel == '' ) {
 341                                 // Allow all users
 342                                 $message = $this->msg( 'protect-default' )->escaped();
 343                         } else {
 344                                 // Administrators only
 345                                 $message = $this->msg( "protect-level-$protectionLevel" );
 346                                 if ( $message->isDisabled() ) {
 347                                         // Require "$1" permission
 348                                         $message = $this->msg( "protect-fallback", $protectionLevel )->parse();
 349                                 } else {
 350                                         $message = $message->escaped();
 351                                 }
 352                         }
 353
 354                         $pageInfo['header-restrictions'][] = array(
 355                                 $this->msg( "restriction-$restrictionType" ), $message
 356                         );
 357                 }
 358
 359                 if ( !$this->page->exists() ) {
 360                         return $pageInfo;
 361                 }
 362
 363                 // Edit history
 364                 $pageInfo['header-edits'] = array();
 365
 366                 $firstRev = $this->page->getOldestRevision();
 367
 368                 // Page creator
 369                 $pageInfo['header-edits'][] = array(
 370                         $this->msg( 'pageinfo-firstuser' ),
 371                         Linker::revUserTools( $firstRev )
 372                 );
 373
 374                 // Date of page creation
 375                 $pageInfo['header-edits'][] = array(
 376                         $this->msg( 'pageinfo-firsttime' ),
 377                         Linker::linkKnown(
 378                                 $title,
 379                                 $lang->userTimeAndDate( $firstRev->getTimestamp(), $user ),
 380                                 array(),
 381                                 array( 'oldid' => $firstRev->getId() )
 382                         )
 383                 );
 384
 385                 // Latest editor
 386                 $pageInfo['header-edits'][] = array(
 387                         $this->msg( 'pageinfo-lastuser' ),
 388                         Linker::revUserTools( $this->page->getRevision() )
 389                 );
 390
 391                 // Date of latest edit
 392                 $pageInfo['header-edits'][] = array(
 393                         $this->msg( 'pageinfo-lasttime' ),
 394                         Linker::linkKnown(
 395                                 $title,
 396                                 $lang->userTimeAndDate( $this->page->getTimestamp(), $user ),
 397                                 array(),
 398                                 array( 'oldid' => $this->page->getLatest() )
 399                         )
 400                 );
 401
 402                 // Total number of edits
 403                 $pageInfo['header-edits'][] = array(
 404                         $this->msg( 'pageinfo-edits' ), $lang->formatNum( $pageCounts['edits'] )
 405                 );
 406
 407                 // Total number of distinct authors
 408                 $pageInfo['header-edits'][] = array(
 409                         $this->msg( 'pageinfo-authors' ), $lang->formatNum( $pageCounts['authors'] )
 410                 );
 411
 412                 // Recent number of edits (within past 30 days)
 413                 $pageInfo['header-edits'][] = array(
 414                         $this->msg( 'pageinfo-recent-edits', $lang->formatDuration( $wgRCMaxAge ) ),
 415                         $lang->formatNum( $pageCounts['recent_edits'] )
 416                 );
 417
 418                 // Recent number of distinct authors
 419                 $pageInfo['header-edits'][] = array(
 420                         $this->msg( 'pageinfo-recent-authors' ), $lang->formatNum( $pageCounts['recent_authors'] )
 421                 );
 422
 423                 // Array of MagicWord objects
 424                 $magicWords = MagicWord::getDoubleUnderscoreArray();
 425
 426                 // Array of magic word IDs
 427                 $wordIDs = $magicWords->names;
 428
 429                 // Array of IDs => localized magic words
 430                 $localizedWords = $wgContLang->getMagicWords();
 431
 432                 $listItems = array();
 433                 foreach ( $pageProperties as $property => $value ) {
 434                         if ( in_array( $property, $wordIDs ) ) {
 435                                 $listItems[] = Html::element( 'li', array(), $localizedWords[$property][1] );
 436                         }
 437                 }
 438
 439                 $localizedList = Html::rawElement( 'ul', array(), implode( '', $listItems ) );
 440                 $hiddenCategories = $this->page->getHiddenCategories();
 441                 $transcludedTemplates = $title->getTemplateLinksFrom();
 442
 443                 if ( count( $listItems ) > 0
 444                         || count( $hiddenCategories ) > 0
 445                         || count( $transcludedTemplates ) > 0 ) {
 446                         // Page properties
 447                         $pageInfo['header-properties'] = array();
 448
 449                         // Magic words
 450                         if ( count( $listItems ) > 0 ) {
 451                                 $pageInfo['header-properties'][] = array(
 452                                         $this->msg( 'pageinfo-magic-words' )->numParams( count( $listItems ) ),
 453                                         $localizedList
 454                                 );
 455                         }
 456
 457                         // Hidden categories
 458                         if ( count( $hiddenCategories ) > 0 ) {
 459                                 $pageInfo['header-properties'][] = array(
 460                                         $this->msg( 'pageinfo-hidden-categories' )
 461                                                 ->numParams( count( $hiddenCategories ) ),
 462                                         Linker::formatHiddenCategories( $hiddenCategories )
 463                                 );
 464                         }
 465
 466                         // Transcluded templates
 467                         if ( count( $transcludedTemplates ) > 0 ) {
 468                                 $pageInfo['header-properties'][] = array(
 469                                         $this->msg( 'pageinfo-templates' )
 470                                                 ->numParams( count( $transcludedTemplates ) ),
 471                                         Linker::formatTemplates( $transcludedTemplates )
 472                                 );
 473                         }
 474                 }
 475
 476                 return $pageInfo;
 477         }
 478
 479         /**
 480          * Returns page counts that would be too "expensive" to retrieve by normal means.
 481          *
 482          * @param Title $title Title to get counts for
 483          * @return array
 484          */
 485         protected static function pageCounts( Title $title ) {
 486                 global $wgRCMaxAge, $wgDisableCounters;
 487
 488                 wfProfileIn( __METHOD__ );
 489                 $id = $title->getArticleID();
 490
 491                 $dbr = wfGetDB( DB_SLAVE );
 492                 $result = array();
 493
 494                 if ( !$wgDisableCounters ) {
 495                         // Number of views
 496                         $views = (int) $dbr->selectField(
 497                                 'page',
 498                                 'page_counter',
 499                                 array( 'page_id' => $id ),
 500                                 __METHOD__
 501                         );
 502                         $result['views'] = $views;
 503                 }
 504
 505                 // Number of page watchers
 506                 $watchers = (int) $dbr->selectField(
 507                         'watchlist',
 508                         'COUNT(*)',
 509                         array(
 510                                 'wl_namespace' => $title->getNamespace(),
 511                                 'wl_title'     => $title->getDBkey(),
 512                         ),
 513                         __METHOD__
 514                 );
 515                 $result['watchers'] = $watchers;
 516
 517                 // Total number of edits
 518                 $edits = (int) $dbr->selectField(
 519                         'revision',
 520                         'COUNT(rev_page)',
 521                         array( 'rev_page' => $id ),
 522                         __METHOD__
 523                 );
 524                 $result['edits'] = $edits;
 525
 526                 // Total number of distinct authors
 527                 $authors = (int) $dbr->selectField(
 528                         'revision',
 529                         'COUNT(DISTINCT rev_user_text)',
 530                         array( 'rev_page' => $id ),
 531                         __METHOD__
 532                 );
 533                 $result['authors'] = $authors;
 534
 535                 // "Recent" threshold defined by $wgRCMaxAge
 536                 $threshold = $dbr->timestamp( time() - $wgRCMaxAge );
 537
 538                 // Recent number of edits
 539                 $edits = (int) $dbr->selectField(
 540                         'revision',
 541                         'COUNT(rev_page)',
 542                         array(
 543                                 'rev_page' => $id ,
 544                                 "rev_timestamp >= $threshold"
 545                         ),
 546                         __METHOD__
 547                 );
 548                 $result['recent_edits'] = $edits;
 549
 550                 // Recent number of distinct authors
 551                 $authors = (int) $dbr->selectField(
 552                         'revision',
 553                         'COUNT(DISTINCT rev_user_text)',
 554                         array(
 555                                 'rev_page' => $id,
 556                                 "rev_timestamp >= $threshold"
 557                         ),
 558                         __METHOD__
 559                 );
 560                 $result['recent_authors'] = $authors;
 561
 562                 // Subpages (if enabled)
 563                 if ( MWNamespace::hasSubpages( $title->getNamespace() ) ) {
 564                         $conds = array( 'page_namespace' => $title->getNamespace() );
 565                         $conds[] = 'page_title ' . $dbr->buildLike( $title->getDBkey() . '/', $dbr->anyString() );
 566
 567                         // Subpages of this page (redirects)
 568                         $conds['page_is_redirect'] = 1;
 569                         $result['subpages']['redirects'] = (int) $dbr->selectField(
 570                                 'page',
 571                                 'COUNT(page_id)',
 572                                 $conds,
 573                                 __METHOD__ );
 574
 575                         // Subpages of this page (non-redirects)
 576                         $conds['page_is_redirect'] = 0;
 577                         $result['subpages']['nonredirects'] = (int) $dbr->selectField(
 578                                 'page',
 579                                 'COUNT(page_id)',
 580                                 $conds,
 581                                 __METHOD__
 582                         );
 583
 584                         // Subpages of this page (total)
 585                         $result['subpages']['total'] = $result['subpages']['redirects']
 586                                 + $result['subpages']['nonredirects'];
 587                 }
 588
 589                 wfProfileOut( __METHOD__ );
 590                 return $result;
 591         }
 592
 593         /**
 594          * Returns the name that goes in the "<h1>" page title.
 595          *
 596          * @return string
 597          */
 598         protected function getPageTitle() {
 599                 return $this->msg( 'pageinfo-title', $this->getTitle()->getPrefixedText() )->text();
 600         }
 601
 602         /**
 603          * Get a list of contributors of $article
 604          * @return string: html
 605          */
 606         protected function getContributors() {
 607                 global $wgHiddenPrefs;
 608
 609                 $contributors = $this->page->getContributors();
 610                 $real_names = array();
 611                 $user_names = array();
 612                 $anon_ips = array();
 613
 614                 # Sift for real versus user names
 615                 foreach ( $contributors as $user ) {
 616                         $page = $user->isAnon()
 617                                 ? SpecialPage::getTitleFor( 'Contributions', $user->getName() )
 618                                 : $user->getUserPage();
 619
 620                         if ( $user->getID() == 0 ) {
 621                                 $anon_ips[] = Linker::link( $page, htmlspecialchars( $user->getName() ) );
 622                         } elseif ( !in_array( 'realname', $wgHiddenPrefs ) && $user->getRealName() ) {
 623                                 $real_names[] = Linker::link( $page, htmlspecialchars( $user->getRealName() ) );
 624                         } else {
 625                                 $user_names[] = Linker::link( $page, htmlspecialchars( $user->getName() ) );
 626                         }
 627                 }
 628
 629                 $lang = $this->getLanguage();
 630
 631                 $real = $lang->listToText( $real_names );
 632
 633                 # "ThisSite user(s) A, B and C"
 634                 if ( count( $user_names ) ) {
 635                         $user = $this->msg( 'siteusers' )->rawParams( $lang->listToText( $user_names ) )->params(
 636                                 count( $user_names ) )->escaped();
 637                 } else {
 638                         $user = false;
 639                 }
 640
 641                 if ( count( $anon_ips ) ) {
 642                         $anon = $this->msg( 'anonusers' )->rawParams( $lang->listToText( $anon_ips ) )->params(
 643                                 count( $anon_ips ) )->escaped();
 644                 } else {
 645                         $anon = false;
 646                 }
 647
 648                 # This is the big list, all mooshed together. We sift for blank strings
 649                 $fulllist = array();
 650                 foreach ( array( $real, $user, $anon ) as $s ) {
 651                         if ( $s !== '' ) {
 652                                 array_push( $fulllist, $s );
 653                         }
 654                 }
 655
 656                 $count = count( $fulllist );
 657                 # "Based on work by ..."
 658                 return $count
 659                         ? $this->msg( 'othercontribs' )->rawParams(
 660                                 $lang->listToText( $fulllist ) )->params( $count )->escaped()
 661                         : '';
 662         }
 663
 664         /**
 665          * Returns the description that goes below the "<h1>" tag.
 666          *
 667          * @return string
 668          */
 669         protected function getDescription() {
 670                 return '';
 671         }
 672 }