includes/specials/SpecialWhatlinkshere.php

   1 <?php
   2 /**
   3  * Implements Special:Whatlinkshere
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  * http://www.gnu.org/copyleft/gpl.html
  19  *
  20  * @file
  21  * @todo Use some variant of Pager or something; the pagination here is lousy.
  22  */
  23
  24 /**
  25  * Implements Special:Whatlinkshere
  26  *
  27  * @ingroup SpecialPage
  28  */
  29 class SpecialWhatLinksHere extends IncludableSpecialPage {
  30         /** @var FormOptions */
  31         protected $opts;
  32
  33         protected $selfTitle;
  34
  35         /** @var Title */
  36         protected $target;
  37
  38         protected $limits = array( 20, 50, 100, 250, 500 );
  39
  40         public function __construct() {
  41                 parent::__construct( 'Whatlinkshere' );
  42         }
  43
  44         function execute( $par ) {
  45                 $out = $this->getOutput();
  46
  47                 $this->setHeaders();
  48                 $this->outputHeader();
  49
  50                 $opts = new FormOptions();
  51
  52                 $opts->add( 'target', '' );
  53                 $opts->add( 'namespace', '', FormOptions::INTNULL );
  54                 $opts->add( 'limit', $this->getConfig()->get( 'QueryPageDefaultLimit' ) );
  55                 $opts->add( 'from', 0 );
  56                 $opts->add( 'back', 0 );
  57                 $opts->add( 'hideredirs', false );
  58                 $opts->add( 'hidetrans', false );
  59                 $opts->add( 'hidelinks', false );
  60                 $opts->add( 'hideimages', false );
  61                 $opts->add( 'invert', false );
  62
  63                 $opts->fetchValuesFromRequest( $this->getRequest() );
  64                 $opts->validateIntBounds( 'limit', 0, 5000 );
  65
  66                 // Give precedence to subpage syntax
  67                 if ( $par !== null ) {
  68                         $opts->setValue( 'target', $par );
  69                 }
  70
  71                 // Bind to member variable
  72                 $this->opts = $opts;
  73
  74                 $this->target = Title::newFromURL( $opts->getValue( 'target' ) );
  75                 if ( !$this->target ) {
  76                         $out->addHTML( $this->whatlinkshereForm() );
  77
  78                         return;
  79                 }
  80
  81                 $this->getSkin()->setRelevantTitle( $this->target );
  82
  83                 $this->selfTitle = $this->getPageTitle( $this->target->getPrefixedDBkey() );
  84
  85                 $out->setPageTitle( $this->msg( 'whatlinkshere-title', $this->target->getPrefixedText() ) );
  86                 $out->addBacklinkSubtitle( $this->target );
  87                 $this->showIndirectLinks(
  88                         0,
  89                         $this->target,
  90                         $opts->getValue( 'limit' ),
  91                         $opts->getValue( 'from' ),
  92                         $opts->getValue( 'back' )
  93                 );
  94         }
  95
  96         /**
  97          * @param int $level Recursion level
  98          * @param Title $target Target title
  99          * @param int $limit Number of entries to display
 100          * @param int $from Display from this article ID (default: 0)
 101          * @param int $back Display from this article ID at backwards scrolling (default: 0)
 102          */
 103         function showIndirectLinks( $level, $target, $limit, $from = 0, $back = 0 ) {
 104                 $out = $this->getOutput();
 105                 $dbr = wfGetDB( DB_SLAVE );
 106
 107                 $hidelinks = $this->opts->getValue( 'hidelinks' );
 108                 $hideredirs = $this->opts->getValue( 'hideredirs' );
 109                 $hidetrans = $this->opts->getValue( 'hidetrans' );
 110                 $hideimages = $target->getNamespace() != NS_FILE || $this->opts->getValue( 'hideimages' );
 111
 112                 $fetchlinks = ( !$hidelinks || !$hideredirs );
 113
 114                 // Build query conds in concert for all three tables...
 115                 $conds['pagelinks'] = array(
 116                         'pl_namespace' => $target->getNamespace(),
 117                         'pl_title' => $target->getDBkey(),
 118                 );
 119                 $conds['templatelinks'] = array(
 120                         'tl_namespace' => $target->getNamespace(),
 121                         'tl_title' => $target->getDBkey(),
 122                 );
 123                 $conds['imagelinks'] = array(
 124                         'il_to' => $target->getDBkey(),
 125                 );
 126
 127                 $useLinkNamespaceDBFields = $this->getConfig()->get( 'UseLinkNamespaceDBFields' );
 128                 $namespace = $this->opts->getValue( 'namespace' );
 129                 $invert = $this->opts->getValue( 'invert' );
 130                 $nsComparison = ( $invert ? '!= ' : '= ' ) . $dbr->addQuotes( $namespace );
 131                 if ( is_int( $namespace ) ) {
 132                         if ( $useLinkNamespaceDBFields ) {
 133                                 $conds['pagelinks'][] = "pl_from_namespace $nsComparison";
 134                                 $conds['templatelinks'][] = "tl_from_namespace $nsComparison";
 135                                 $conds['imagelinks'][] = "il_from_namespace $nsComparison";
 136                         } else {
 137                                 $conds['pagelinks'][] = "page_namespace $nsComparison";
 138                                 $conds['templatelinks'][] = "page_namespace $nsComparison";
 139                                 $conds['imagelinks'][] = "page_namespace $nsComparison";
 140                         }
 141                 }
 142
 143                 if ( $from ) {
 144                         $conds['templatelinks'][] = "tl_from >= $from";
 145                         $conds['pagelinks'][] = "pl_from >= $from";
 146                         $conds['imagelinks'][] = "il_from >= $from";
 147                 }
 148
 149                 if ( $hideredirs ) {
 150                         $conds['pagelinks']['rd_from'] = null;
 151                 } elseif ( $hidelinks ) {
 152                         $conds['pagelinks'][] = 'rd_from is NOT NULL';
 153                 }
 154
 155                 $queryFunc = function ( $dbr, $table, $fromCol ) use ( $conds, $target, $limit, $useLinkNamespaceDBFields ) {
 156                         // Read an extra row as an at-end check
 157                         $queryLimit = $limit + 1;
 158                         $on = array(
 159                                 "rd_from = $fromCol",
 160                                 'rd_title' => $target->getDBkey(),
 161                                 'rd_interwiki = ' . $dbr->addQuotes( '' ) . ' OR rd_interwiki IS NULL'
 162                         );
 163                         if ( $useLinkNamespaceDBFields ) { // migration check
 164                                 $on['rd_namespace'] = $target->getNamespace();
 165                         }
 166                         // Inner LIMIT is 2X in case of stale backlinks with wrong namespaces
 167                         $subQuery = $dbr->selectSqlText(
 168                                 array( $table, 'page', 'redirect' ),
 169                                 array( $fromCol, 'rd_from' ),
 170                                 $conds[$table],
 171                                 __CLASS__ . '::showIndirectLinks',
 172                                 array( 'ORDER BY' => $fromCol, 'LIMIT' => 2 * $queryLimit ),
 173                                 array(
 174                                         'page' => array( 'INNER JOIN', "$fromCol = page_id" ),
 175                                         'redirect' => array( 'LEFT JOIN', $on )
 176                                 )
 177                         );
 178                         return $dbr->select(
 179                                 array( 'page', 'temp_backlink_range' => "($subQuery)" ),
 180                                 array( 'page_id', 'page_namespace', 'page_title', 'rd_from' ),
 181                                 array(),
 182                                 __CLASS__ . '::showIndirectLinks',
 183                                 array( 'ORDER BY' => 'page_id', 'LIMIT' => $queryLimit ),
 184                                 array( 'page' => array( 'INNER JOIN', "$fromCol = page_id" ) )
 185                         );
 186                 };
 187
 188                 if ( $fetchlinks ) {
 189                         $plRes = $queryFunc( $dbr, 'pagelinks', 'pl_from' );
 190                 }
 191
 192                 if ( !$hidetrans ) {
 193                         $tlRes = $queryFunc( $dbr, 'templatelinks', 'tl_from' );
 194                 }
 195
 196                 if ( !$hideimages ) {
 197                         $ilRes = $queryFunc( $dbr, 'imagelinks', 'il_from' );
 198                 }
 199
 200                 if ( ( !$fetchlinks || !$plRes->numRows() )
 201                         && ( $hidetrans || !$tlRes->numRows() )
 202                         && ( $hideimages || !$ilRes->numRows() )
 203                 ) {
 204                         if ( 0 == $level ) {
 205                                 if ( !$this->including() ) {
 206                                         $out->addHTML( $this->whatlinkshereForm() );
 207
 208                                         // Show filters only if there are links
 209                                         if ( $hidelinks || $hidetrans || $hideredirs || $hideimages ) {
 210                                                 $out->addHTML( $this->getFilterPanel() );
 211                                         }
 212                                         $errMsg = is_int( $namespace ) ? 'nolinkshere-ns' : 'nolinkshere';
 213                                         $out->addWikiMsg( $errMsg, $this->target->getPrefixedText() );
 214                                         $out->setStatusCode( 404 );
 215                                 }
 216                         }
 217
 218                         return;
 219                 }
 220
 221                 // Read the rows into an array and remove duplicates
 222                 // templatelinks comes second so that the templatelinks row overwrites the
 223                 // pagelinks row, so we get (inclusion) rather than nothing
 224                 if ( $fetchlinks ) {
 225                         foreach ( $plRes as $row ) {
 226                                 $row->is_template = 0;
 227                                 $row->is_image = 0;
 228                                 $rows[$row->page_id] = $row;
 229                         }
 230                 }
 231                 if ( !$hidetrans ) {
 232                         foreach ( $tlRes as $row ) {
 233                                 $row->is_template = 1;
 234                                 $row->is_image = 0;
 235                                 $rows[$row->page_id] = $row;
 236                         }
 237                 }
 238                 if ( !$hideimages ) {
 239                         foreach ( $ilRes as $row ) {
 240                                 $row->is_template = 0;
 241                                 $row->is_image = 1;
 242                                 $rows[$row->page_id] = $row;
 243                         }
 244                 }
 245
 246                 // Sort by key and then change the keys to 0-based indices
 247                 ksort( $rows );
 248                 $rows = array_values( $rows );
 249
 250                 $numRows = count( $rows );
 251
 252                 // Work out the start and end IDs, for prev/next links
 253                 if ( $numRows > $limit ) {
 254                         // More rows available after these ones
 255                         // Get the ID from the last row in the result set
 256                         $nextId = $rows[$limit]->page_id;
 257                         // Remove undisplayed rows
 258                         $rows = array_slice( $rows, 0, $limit );
 259                 } else {
 260                         // No more rows after
 261                         $nextId = false;
 262                 }
 263                 $prevId = $from;
 264
 265                 if ( $level == 0 ) {
 266                         if ( !$this->including() ) {
 267                                 $out->addHTML( $this->whatlinkshereForm() );
 268                                 $out->addHTML( $this->getFilterPanel() );
 269                                 $out->addWikiMsg( 'linkshere', $this->target->getPrefixedText() );
 270
 271                                 $prevnext = $this->getPrevNext( $prevId, $nextId );
 272                                 $out->addHTML( $prevnext );
 273                         }
 274                 }
 275                 $out->addHTML( $this->listStart( $level ) );
 276                 foreach ( $rows as $row ) {
 277                         $nt = Title::makeTitle( $row->page_namespace, $row->page_title );
 278
 279                         if ( $row->rd_from && $level < 2 ) {
 280                                 $out->addHTML( $this->listItem( $row, $nt, $target, true ) );
 281                                 $this->showIndirectLinks( $level + 1, $nt, $this->getConfig()->get( 'MaxRedirectLinksRetrieved' ) );
 282                                 $out->addHTML( Xml::closeElement( 'li' ) );
 283                         } else {
 284                                 $out->addHTML( $this->listItem( $row, $nt, $target ) );
 285                         }
 286                 }
 287
 288                 $out->addHTML( $this->listEnd() );
 289
 290                 if ( $level == 0 ) {
 291                         if ( !$this->including() ) {
 292                                 $out->addHTML( $prevnext );
 293                         }
 294                 }
 295         }
 296
 297         protected function listStart( $level ) {
 298                 return Xml::openElement( 'ul', ( $level ? array() : array( 'id' => 'mw-whatlinkshere-list' ) ) );
 299         }
 300
 301         protected function listItem( $row, $nt, $target, $notClose = false ) {
 302                 $dirmark = $this->getLanguage()->getDirMark();
 303
 304                 # local message cache
 305                 static $msgcache = null;
 306                 if ( $msgcache === null ) {
 307                         static $msgs = array( 'isredirect', 'istemplate', 'semicolon-separator',
 308                                 'whatlinkshere-links', 'isimage' );
 309                         $msgcache = array();
 310                         foreach ( $msgs as $msg ) {
 311                                 $msgcache[$msg] = $this->msg( $msg )->escaped();
 312                         }
 313                 }
 314
 315                 if ( $row->rd_from ) {
 316                         $query = array( 'redirect' => 'no' );
 317                 } else {
 318                         $query = array();
 319                 }
 320
 321                 $link = Linker::linkKnown(
 322                         $nt,
 323                         null,
 324                         array(),
 325                         $query
 326                 );
 327
 328                 // Display properties (redirect or template)
 329                 $propsText = '';
 330                 $props = array();
 331                 if ( $row->rd_from ) {
 332                         $props[] = $msgcache['isredirect'];
 333                 }
 334                 if ( $row->is_template ) {
 335                         $props[] = $msgcache['istemplate'];
 336                 }
 337                 if ( $row->is_image ) {
 338                         $props[] = $msgcache['isimage'];
 339                 }
 340
 341                 Hooks::run( 'WhatLinksHereProps', array( $row, $nt, $target, &$props ) );
 342
 343                 if ( count( $props ) ) {
 344                         $propsText = $this->msg( 'parentheses' )
 345                                 ->rawParams( implode( $msgcache['semicolon-separator'], $props ) )->escaped();
 346                 }
 347
 348                 # Space for utilities links, with a what-links-here link provided
 349                 $wlhLink = $this->wlhLink( $nt, $msgcache['whatlinkshere-links'] );
 350                 $wlh = Xml::wrapClass(
 351                         $this->msg( 'parentheses' )->rawParams( $wlhLink )->escaped(),
 352                         'mw-whatlinkshere-tools'
 353                 );
 354
 355                 return $notClose ?
 356                         Xml::openElement( 'li' ) . "$link $propsText $dirmark $wlh\n" :
 357                         Xml::tags( 'li', null, "$link $propsText $dirmark $wlh" ) . "\n";
 358         }
 359
 360         protected function listEnd() {
 361                 return Xml::closeElement( 'ul' );
 362         }
 363
 364         protected function wlhLink( Title $target, $text ) {
 365                 static $title = null;
 366                 if ( $title === null ) {
 367                         $title = $this->getPageTitle();
 368                 }
 369
 370                 return Linker::linkKnown(
 371                         $title,
 372                         $text,
 373                         array(),
 374                         array( 'target' => $target->getPrefixedText() )
 375                 );
 376         }
 377
 378         function makeSelfLink( $text, $query ) {
 379                 return Linker::linkKnown(
 380                         $this->selfTitle,
 381                         $text,
 382                         array(),
 383                         $query
 384                 );
 385         }
 386
 387         function getPrevNext( $prevId, $nextId ) {
 388                 $currentLimit = $this->opts->getValue( 'limit' );
 389                 $prev = $this->msg( 'whatlinkshere-prev' )->numParams( $currentLimit )->escaped();
 390                 $next = $this->msg( 'whatlinkshere-next' )->numParams( $currentLimit )->escaped();
 391
 392                 $changed = $this->opts->getChangedValues();
 393                 unset( $changed['target'] ); // Already in the request title
 394
 395                 if ( 0 != $prevId ) {
 396                         $overrides = array( 'from' => $this->opts->getValue( 'back' ) );
 397                         $prev = $this->makeSelfLink( $prev, array_merge( $changed, $overrides ) );
 398                 }
 399                 if ( 0 != $nextId ) {
 400                         $overrides = array( 'from' => $nextId, 'back' => $prevId );
 401                         $next = $this->makeSelfLink( $next, array_merge( $changed, $overrides ) );
 402                 }
 403
 404                 $limitLinks = array();
 405                 $lang = $this->getLanguage();
 406                 foreach ( $this->limits as $limit ) {
 407                         $prettyLimit = htmlspecialchars( $lang->formatNum( $limit ) );
 408                         $overrides = array( 'limit' => $limit );
 409                         $limitLinks[] = $this->makeSelfLink( $prettyLimit, array_merge( $changed, $overrides ) );
 410                 }
 411
 412                 $nums = $lang->pipeList( $limitLinks );
 413
 414                 return $this->msg( 'viewprevnext' )->rawParams( $prev, $next, $nums )->escaped();
 415         }
 416
 417         function whatlinkshereForm() {
 418                 // We get nicer value from the title object
 419                 $this->opts->consumeValue( 'target' );
 420                 // Reset these for new requests
 421                 $this->opts->consumeValues( array( 'back', 'from' ) );
 422
 423                 $target = $this->target ? $this->target->getPrefixedText() : '';
 424                 $namespace = $this->opts->consumeValue( 'namespace' );
 425                 $nsinvert = $this->opts->consumeValue( 'invert' );
 426
 427                 # Build up the form
 428                 $f = Xml::openElement( 'form', array( 'action' => wfScript() ) );
 429
 430                 # Values that should not be forgotten
 431                 $f .= Html::hidden( 'title', $this->getPageTitle()->getPrefixedText() );
 432                 foreach ( $this->opts->getUnconsumedValues() as $name => $value ) {
 433                         $f .= Html::hidden( $name, $value );
 434                 }
 435
 436                 $f .= Xml::fieldset( $this->msg( 'whatlinkshere' )->text() );
 437
 438                 # Target input (.mw-searchInput enables suggestions)
 439                 $f .= Xml::inputLabel( $this->msg( 'whatlinkshere-page' )->text(), 'target',
 440                         'mw-whatlinkshere-target', 40, $target, array( 'class' => 'mw-searchInput' ) );
 441
 442                 $f .= ' ';
 443
 444                 # Namespace selector
 445                 $f .= Html::namespaceSelector(
 446                         array(
 447                                 'selected' => $namespace,
 448                                 'all' => '',
 449                                 'label' => $this->msg( 'namespace' )->text()
 450                         ), array(
 451                                 'name' => 'namespace',
 452                                 'id' => 'namespace',
 453                                 'class' => 'namespaceselector',
 454                         )
 455                 );
 456
 457                 $f .= '&#160;' .
 458                         Xml::checkLabel(
 459                                 $this->msg( 'invert' )->text(),
 460                                 'invert',
 461                                 'nsinvert',
 462                                 $nsinvert,
 463                                 array( 'title' => $this->msg( 'tooltip-whatlinkshere-invert' )->text() )
 464                         );
 465
 466                 $f .= ' ';
 467
 468                 # Submit
 469                 $f .= Xml::submitButton( $this->msg( 'allpagessubmit' )->text() );
 470
 471                 # Close
 472                 $f .= Xml::closeElement( 'fieldset' ) . Xml::closeElement( 'form' ) . "\n";
 473
 474                 return $f;
 475         }
 476
 477         /**
 478          * Create filter panel
 479          *
 480          * @return string HTML fieldset and filter panel with the show/hide links
 481          */
 482         function getFilterPanel() {
 483                 $show = $this->msg( 'show' )->escaped();
 484                 $hide = $this->msg( 'hide' )->escaped();
 485
 486                 $changed = $this->opts->getChangedValues();
 487                 unset( $changed['target'] ); // Already in the request title
 488
 489                 $links = array();
 490                 $types = array( 'hidetrans', 'hidelinks', 'hideredirs' );
 491                 if ( $this->target->getNamespace() == NS_FILE ) {
 492                         $types[] = 'hideimages';
 493                 }
 494
 495                 // Combined message keys: 'whatlinkshere-hideredirs', 'whatlinkshere-hidetrans',
 496                 // 'whatlinkshere-hidelinks', 'whatlinkshere-hideimages'
 497                 // To be sure they will be found by grep
 498                 foreach ( $types as $type ) {
 499                         $chosen = $this->opts->getValue( $type );
 500                         $msg = $chosen ? $show : $hide;
 501                         $overrides = array( $type => !$chosen );
 502                         $links[] = $this->msg( "whatlinkshere-{$type}" )->rawParams(
 503                                 $this->makeSelfLink( $msg, array_merge( $changed, $overrides ) ) )->escaped();
 504                 }
 505
 506                 return Xml::fieldset(
 507                         $this->msg( 'whatlinkshere-filters' )->text(),
 508                         $this->getLanguage()->pipeList( $links )
 509                 );
 510         }
 511
 512         /**
 513          * Return an array of subpages beginning with $search that this special page will accept.
 514          *
 515          * @param string $search Prefix to search for
 516          * @param int $limit Maximum number of results to return (usually 10)
 517          * @param int $offset Number of results to skip (usually 0)
 518          * @return string[] Matching subpages
 519          */
 520         public function prefixSearchSubpages( $search, $limit, $offset ) {
 521                 if ( $search === '' ) {
 522                         return array();
 523                 }
 524                 // Autocomplete subpage the same as a normal search
 525                 $prefixSearcher = new StringPrefixSearch;
 526                 $result = $prefixSearcher->search( $search, $limit, array(), $offset );
 527                 return $result;
 528         }
 529
 530         protected function getGroupName() {
 531                 return 'pagetools';
 532         }
 533 }