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
  62                 $opts->fetchValuesFromRequest( $this->getRequest() );
  63                 $opts->validateIntBounds( 'limit', 0, 5000 );
  64
  65                 // Give precedence to subpage syntax
  66                 if ( $par !== null ) {
  67                         $opts->setValue( 'target', $par );
  68                 }
  69
  70                 // Bind to member variable
  71                 $this->opts = $opts;
  72
  73                 $this->target = Title::newFromURL( $opts->getValue( 'target' ) );
  74                 if ( !$this->target ) {
  75                         $out->addHTML( $this->whatlinkshereForm() );
  76
  77                         return;
  78                 }
  79
  80                 $this->getSkin()->setRelevantTitle( $this->target );
  81
  82                 $this->selfTitle = $this->getPageTitle( $this->target->getPrefixedDBkey() );
  83
  84                 $out->setPageTitle( $this->msg( 'whatlinkshere-title', $this->target->getPrefixedText() ) );
  85                 $out->addBacklinkSubtitle( $this->target );
  86                 $this->showIndirectLinks(
  87                         0,
  88                         $this->target,
  89                         $opts->getValue( 'limit' ),
  90                         $opts->getValue( 'from' ),
  91                         $opts->getValue( 'back' )
  92                 );
  93         }
  94
  95         /**
  96          * @param int $level Recursion level
  97          * @param Title $target Target title
  98          * @param int $limit Number of entries to display
  99          * @param int $from Display from this article ID (default: 0)
 100          * @param int $back Display from this article ID at backwards scrolling (default: 0)
 101          */
 102         function showIndirectLinks( $level, $target, $limit, $from = 0, $back = 0 ) {
 103                 $out = $this->getOutput();
 104                 $dbr = wfGetDB( DB_SLAVE );
 105
 106                 $hidelinks = $this->opts->getValue( 'hidelinks' );
 107                 $hideredirs = $this->opts->getValue( 'hideredirs' );
 108                 $hidetrans = $this->opts->getValue( 'hidetrans' );
 109                 $hideimages = $target->getNamespace() != NS_FILE || $this->opts->getValue( 'hideimages' );
 110
 111                 $fetchlinks = ( !$hidelinks || !$hideredirs );
 112
 113                 // Build query conds in concert for all three tables...
 114                 $conds['pagelinks'] = array(
 115                         'pl_namespace' => $target->getNamespace(),
 116                         'pl_title' => $target->getDBkey(),
 117                 );
 118                 $conds['templatelinks'] = array(
 119                         'tl_namespace' => $target->getNamespace(),
 120                         'tl_title' => $target->getDBkey(),
 121                 );
 122                 $conds['imagelinks'] = array(
 123                         'il_to' => $target->getDBkey(),
 124                 );
 125
 126                 $useLinkNamespaceDBFields = $this->getConfig()->get( 'UseLinkNamespaceDBFields' );
 127                 $namespace = $this->opts->getValue( 'namespace' );
 128                 if ( is_int( $namespace ) ) {
 129                         if ( $useLinkNamespaceDBFields ) {
 130                                 $conds['pagelinks']['pl_from_namespace'] = $namespace;
 131                                 $conds['templatelinks']['tl_from_namespace'] = $namespace;
 132                                 $conds['imagelinks']['il_from_namespace'] = $namespace;
 133                         } else {
 134                                 $conds['pagelinks']['page_namespace'] = $namespace;
 135                                 $conds['templatelinks']['page_namespace'] = $namespace;
 136                                 $conds['imagelinks']['page_namespace'] = $namespace;
 137                         }
 138                 }
 139
 140                 if ( $from ) {
 141                         $conds['templatelinks'][] = "tl_from >= $from";
 142                         $conds['pagelinks'][] = "pl_from >= $from";
 143                         $conds['imagelinks'][] = "il_from >= $from";
 144                 }
 145
 146                 if ( $hideredirs ) {
 147                         $conds['pagelinks']['rd_from'] = null;
 148                 } elseif ( $hidelinks ) {
 149                         $conds['pagelinks'][] = 'rd_from is NOT NULL';
 150                 }
 151
 152                 $queryFunc = function ( $dbr, $table, $fromCol ) use ( $conds, $target, $limit, $useLinkNamespaceDBFields ) {
 153                         // Read an extra row as an at-end check
 154                         $queryLimit = $limit + 1;
 155                         $on = array(
 156                                 "rd_from = $fromCol",
 157                                 'rd_title' => $target->getDBkey(),
 158                                 'rd_interwiki = ' . $dbr->addQuotes( '' ) . ' OR rd_interwiki IS NULL'
 159                         );
 160                         if ( $useLinkNamespaceDBFields ) { // migration check
 161                                 $on['rd_namespace'] = $target->getNamespace();
 162                         }
 163                         // Inner LIMIT is 2X in case of stale backlinks with wrong namespaces
 164                         $subQuery = $dbr->selectSqlText(
 165                                 array( $table, 'page', 'redirect' ),
 166                                 array( $fromCol, 'rd_from' ),
 167                                 $conds[$table],
 168                                 __CLASS__ . '::showIndirectLinks',
 169                                 array( 'ORDER BY' => $fromCol, 'LIMIT' => 2 * $queryLimit ),
 170                                 array(
 171                                         'page' => array( 'INNER JOIN', "$fromCol = page_id" ),
 172                                         'redirect' => array( 'LEFT JOIN', $on )
 173                                 )
 174                         );
 175                         return $dbr->select(
 176                                 array( 'page', 'temp_backlink_range' => "($subQuery)" ),
 177                                 array( 'page_id', 'page_namespace', 'page_title', 'rd_from' ),
 178                                 array(),
 179                                 __CLASS__ . '::showIndirectLinks',
 180                                 array( 'ORDER BY' => 'page_id', 'LIMIT' => $queryLimit ),
 181                                 array( 'page' => array( 'INNER JOIN', "$fromCol = page_id" ) )
 182                         );
 183                 };
 184
 185                 if ( $fetchlinks ) {
 186                         $plRes = $queryFunc( $dbr, 'pagelinks', 'pl_from' );
 187                 }
 188
 189                 if ( !$hidetrans ) {
 190                         $tlRes = $queryFunc( $dbr, 'templatelinks', 'tl_from' );
 191                 }
 192
 193                 if ( !$hideimages ) {
 194                         $ilRes = $queryFunc( $dbr, 'imagelinks', 'il_from' );
 195                 }
 196
 197                 if ( ( !$fetchlinks || !$plRes->numRows() )
 198                         && ( $hidetrans || !$tlRes->numRows() )
 199                         && ( $hideimages || !$ilRes->numRows() )
 200                 ) {
 201                         if ( 0 == $level ) {
 202                                 if ( !$this->including() ) {
 203                                         $out->addHTML( $this->whatlinkshereForm() );
 204
 205                                         // Show filters only if there are links
 206                                         if ( $hidelinks || $hidetrans || $hideredirs || $hideimages ) {
 207                                                 $out->addHTML( $this->getFilterPanel() );
 208                                         }
 209                                         $errMsg = is_int( $namespace ) ? 'nolinkshere-ns' : 'nolinkshere';
 210                                         $out->addWikiMsg( $errMsg, $this->target->getPrefixedText() );
 211                                         $out->setStatusCode( 404 );
 212                                 }
 213                         }
 214
 215                         return;
 216                 }
 217
 218                 // Read the rows into an array and remove duplicates
 219                 // templatelinks comes second so that the templatelinks row overwrites the
 220                 // pagelinks row, so we get (inclusion) rather than nothing
 221                 if ( $fetchlinks ) {
 222                         foreach ( $plRes as $row ) {
 223                                 $row->is_template = 0;
 224                                 $row->is_image = 0;
 225                                 $rows[$row->page_id] = $row;
 226                         }
 227                 }
 228                 if ( !$hidetrans ) {
 229                         foreach ( $tlRes as $row ) {
 230                                 $row->is_template = 1;
 231                                 $row->is_image = 0;
 232                                 $rows[$row->page_id] = $row;
 233                         }
 234                 }
 235                 if ( !$hideimages ) {
 236                         foreach ( $ilRes as $row ) {
 237                                 $row->is_template = 0;
 238                                 $row->is_image = 1;
 239                                 $rows[$row->page_id] = $row;
 240                         }
 241                 }
 242
 243                 // Sort by key and then change the keys to 0-based indices
 244                 ksort( $rows );
 245                 $rows = array_values( $rows );
 246
 247                 $numRows = count( $rows );
 248
 249                 // Work out the start and end IDs, for prev/next links
 250                 if ( $numRows > $limit ) {
 251                         // More rows available after these ones
 252                         // Get the ID from the last row in the result set
 253                         $nextId = $rows[$limit]->page_id;
 254                         // Remove undisplayed rows
 255                         $rows = array_slice( $rows, 0, $limit );
 256                 } else {
 257                         // No more rows after
 258                         $nextId = false;
 259                 }
 260                 $prevId = $from;
 261
 262                 if ( $level == 0 ) {
 263                         if ( !$this->including() ) {
 264                                 $out->addHTML( $this->whatlinkshereForm() );
 265                                 $out->addHTML( $this->getFilterPanel() );
 266                                 $out->addWikiMsg( 'linkshere', $this->target->getPrefixedText() );
 267
 268                                 $prevnext = $this->getPrevNext( $prevId, $nextId );
 269                                 $out->addHTML( $prevnext );
 270                         }
 271                 }
 272                 $out->addHTML( $this->listStart( $level ) );
 273                 foreach ( $rows as $row ) {
 274                         $nt = Title::makeTitle( $row->page_namespace, $row->page_title );
 275
 276                         if ( $row->rd_from && $level < 2 ) {
 277                                 $out->addHTML( $this->listItem( $row, $nt, $target, true ) );
 278                                 $this->showIndirectLinks( $level + 1, $nt, $this->getConfig()->get( 'MaxRedirectLinksRetrieved' ) );
 279                                 $out->addHTML( Xml::closeElement( 'li' ) );
 280                         } else {
 281                                 $out->addHTML( $this->listItem( $row, $nt, $target ) );
 282                         }
 283                 }
 284
 285                 $out->addHTML( $this->listEnd() );
 286
 287                 if ( $level == 0 ) {
 288                         if ( !$this->including() ) {
 289                                 $out->addHTML( $prevnext );
 290                         }
 291                 }
 292         }
 293
 294         protected function listStart( $level ) {
 295                 return Xml::openElement( 'ul', ( $level ? array() : array( 'id' => 'mw-whatlinkshere-list' ) ) );
 296         }
 297
 298         protected function listItem( $row, $nt, $target, $notClose = false ) {
 299                 $dirmark = $this->getLanguage()->getDirMark();
 300
 301                 # local message cache
 302                 static $msgcache = null;
 303                 if ( $msgcache === null ) {
 304                         static $msgs = array( 'isredirect', 'istemplate', 'semicolon-separator',
 305                                 'whatlinkshere-links', 'isimage' );
 306                         $msgcache = array();
 307                         foreach ( $msgs as $msg ) {
 308                                 $msgcache[$msg] = $this->msg( $msg )->escaped();
 309                         }
 310                 }
 311
 312                 if ( $row->rd_from ) {
 313                         $query = array( 'redirect' => 'no' );
 314                 } else {
 315                         $query = array();
 316                 }
 317
 318                 $link = Linker::linkKnown(
 319                         $nt,
 320                         null,
 321                         array(),
 322                         $query
 323                 );
 324
 325                 // Display properties (redirect or template)
 326                 $propsText = '';
 327                 $props = array();
 328                 if ( $row->rd_from ) {
 329                         $props[] = $msgcache['isredirect'];
 330                 }
 331                 if ( $row->is_template ) {
 332                         $props[] = $msgcache['istemplate'];
 333                 }
 334                 if ( $row->is_image ) {
 335                         $props[] = $msgcache['isimage'];
 336                 }
 337
 338                 wfRunHooks( 'WhatLinksHereProps', array( $row, $nt, $target, &$props ) );
 339
 340                 if ( count( $props ) ) {
 341                         $propsText = $this->msg( 'parentheses' )
 342                                 ->rawParams( implode( $msgcache['semicolon-separator'], $props ) )->escaped();
 343                 }
 344
 345                 # Space for utilities links, with a what-links-here link provided
 346                 $wlhLink = $this->wlhLink( $nt, $msgcache['whatlinkshere-links'] );
 347                 $wlh = Xml::wrapClass(
 348                         $this->msg( 'parentheses' )->rawParams( $wlhLink )->escaped(),
 349                         'mw-whatlinkshere-tools'
 350                 );
 351
 352                 return $notClose ?
 353                         Xml::openElement( 'li' ) . "$link $propsText $dirmark $wlh\n" :
 354                         Xml::tags( 'li', null, "$link $propsText $dirmark $wlh" ) . "\n";
 355         }
 356
 357         protected function listEnd() {
 358                 return Xml::closeElement( 'ul' );
 359         }
 360
 361         protected function wlhLink( Title $target, $text ) {
 362                 static $title = null;
 363                 if ( $title === null ) {
 364                         $title = $this->getPageTitle();
 365                 }
 366
 367                 return Linker::linkKnown(
 368                         $title,
 369                         $text,
 370                         array(),
 371                         array( 'target' => $target->getPrefixedText() )
 372                 );
 373         }
 374
 375         function makeSelfLink( $text, $query ) {
 376                 return Linker::linkKnown(
 377                         $this->selfTitle,
 378                         $text,
 379                         array(),
 380                         $query
 381                 );
 382         }
 383
 384         function getPrevNext( $prevId, $nextId ) {
 385                 $currentLimit = $this->opts->getValue( 'limit' );
 386                 $prev = $this->msg( 'whatlinkshere-prev' )->numParams( $currentLimit )->escaped();
 387                 $next = $this->msg( 'whatlinkshere-next' )->numParams( $currentLimit )->escaped();
 388
 389                 $changed = $this->opts->getChangedValues();
 390                 unset( $changed['target'] ); // Already in the request title
 391
 392                 if ( 0 != $prevId ) {
 393                         $overrides = array( 'from' => $this->opts->getValue( 'back' ) );
 394                         $prev = $this->makeSelfLink( $prev, array_merge( $changed, $overrides ) );
 395                 }
 396                 if ( 0 != $nextId ) {
 397                         $overrides = array( 'from' => $nextId, 'back' => $prevId );
 398                         $next = $this->makeSelfLink( $next, array_merge( $changed, $overrides ) );
 399                 }
 400
 401                 $limitLinks = array();
 402                 $lang = $this->getLanguage();
 403                 foreach ( $this->limits as $limit ) {
 404                         $prettyLimit = htmlspecialchars( $lang->formatNum( $limit ) );
 405                         $overrides = array( 'limit' => $limit );
 406                         $limitLinks[] = $this->makeSelfLink( $prettyLimit, array_merge( $changed, $overrides ) );
 407                 }
 408
 409                 $nums = $lang->pipeList( $limitLinks );
 410
 411                 return $this->msg( 'viewprevnext' )->rawParams( $prev, $next, $nums )->escaped();
 412         }
 413
 414         function whatlinkshereForm() {
 415                 // We get nicer value from the title object
 416                 $this->opts->consumeValue( 'target' );
 417                 // Reset these for new requests
 418                 $this->opts->consumeValues( array( 'back', 'from' ) );
 419
 420                 $target = $this->target ? $this->target->getPrefixedText() : '';
 421                 $namespace = $this->opts->consumeValue( 'namespace' );
 422
 423                 # Build up the form
 424                 $f = Xml::openElement( 'form', array( 'action' => wfScript() ) );
 425
 426                 # Values that should not be forgotten
 427                 $f .= Html::hidden( 'title', $this->getPageTitle()->getPrefixedText() );
 428                 foreach ( $this->opts->getUnconsumedValues() as $name => $value ) {
 429                         $f .= Html::hidden( $name, $value );
 430                 }
 431
 432                 $f .= Xml::fieldset( $this->msg( 'whatlinkshere' )->text() );
 433
 434                 # Target input (.mw-searchInput enables suggestions)
 435                 $f .= Xml::inputLabel( $this->msg( 'whatlinkshere-page' )->text(), 'target',
 436                         'mw-whatlinkshere-target', 40, $target, array( 'class' => 'mw-searchInput' ) );
 437
 438                 $f .= ' ';
 439
 440                 # Namespace selector
 441                 $f .= Html::namespaceSelector(
 442                         array(
 443                                 'selected' => $namespace,
 444                                 'all' => '',
 445                                 'label' => $this->msg( 'namespace' )->text()
 446                         ), array(
 447                                 'name' => 'namespace',
 448                                 'id' => 'namespace',
 449                                 'class' => 'namespaceselector',
 450                         )
 451                 );
 452
 453                 $f .= ' ';
 454
 455                 # Submit
 456                 $f .= Xml::submitButton( $this->msg( 'allpagessubmit' )->text() );
 457
 458                 # Close
 459                 $f .= Xml::closeElement( 'fieldset' ) . Xml::closeElement( 'form' ) . "\n";
 460
 461                 return $f;
 462         }
 463
 464         /**
 465          * Create filter panel
 466          *
 467          * @return string HTML fieldset and filter panel with the show/hide links
 468          */
 469         function getFilterPanel() {
 470                 $show = $this->msg( 'show' )->escaped();
 471                 $hide = $this->msg( 'hide' )->escaped();
 472
 473                 $changed = $this->opts->getChangedValues();
 474                 unset( $changed['target'] ); // Already in the request title
 475
 476                 $links = array();
 477                 $types = array( 'hidetrans', 'hidelinks', 'hideredirs' );
 478                 if ( $this->target->getNamespace() == NS_FILE ) {
 479                         $types[] = 'hideimages';
 480                 }
 481
 482                 // Combined message keys: 'whatlinkshere-hideredirs', 'whatlinkshere-hidetrans',
 483                 // 'whatlinkshere-hidelinks', 'whatlinkshere-hideimages'
 484                 // To be sure they will be found by grep
 485                 foreach ( $types as $type ) {
 486                         $chosen = $this->opts->getValue( $type );
 487                         $msg = $chosen ? $show : $hide;
 488                         $overrides = array( $type => !$chosen );
 489                         $links[] = $this->msg( "whatlinkshere-{$type}" )->rawParams(
 490                                 $this->makeSelfLink( $msg, array_merge( $changed, $overrides ) ) )->escaped();
 491                 }
 492
 493                 return Xml::fieldset(
 494                         $this->msg( 'whatlinkshere-filters' )->text(),
 495                         $this->getLanguage()->pipeList( $links )
 496                 );
 497         }
 498
 499         protected function getGroupName() {
 500                 return 'pagetools';
 501         }
 502 }