includes/QueryPage.php

   1 <?php
   2 /**
   3  * Contain a class for special pages
   4  * @file
   5  * @ingroup SpecialPages
   6  */
   7
   8 /**
   9  * List of query page classes and their associated special pages,
  10  * for periodic updates.
  11  *
  12  * DO NOT CHANGE THIS LIST without testing that
  13  * maintenance/updateSpecialPages.php still works.
  14  */
  15 global $wgQueryPages; // not redundant
  16 $wgQueryPages = array(
  17 //         QueryPage subclass           Special page name         Limit (false for none, none for the default)
  18 //----------------------------------------------------------------------------
  19         array( 'AncientPagesPage',              'Ancientpages'                  ),
  20         array( 'BrokenRedirectsPage',           'BrokenRedirects'               ),
  21         array( 'DeadendPagesPage',              'Deadendpages'                  ),
  22         array( 'DisambiguationsPage',           'Disambiguations'               ),
  23         array( 'DoubleRedirectsPage',           'DoubleRedirects'               ),
  24         array( 'LinkSearchPage',                'LinkSearch'                    ),
  25         array( 'ListredirectsPage',             'Listredirects'                 ),
  26         array( 'LonelyPagesPage',               'Lonelypages'                   ),
  27         array( 'LongPagesPage',                 'Longpages'                     ),
  28         array( 'MostcategoriesPage',            'Mostcategories'                ),
  29         array( 'MostimagesPage',                'Mostimages'                    ),
  30         array( 'MostlinkedCategoriesPage',      'Mostlinkedcategories'          ),
  31         array( 'SpecialMostlinkedtemplates',    'Mostlinkedtemplates'           ),
  32         array( 'MostlinkedPage',                'Mostlinked'                    ),
  33         array( 'MostrevisionsPage',             'Mostrevisions'                 ),
  34         array( 'FewestrevisionsPage',           'Fewestrevisions'               ),
  35         array( 'ShortPagesPage',                'Shortpages'                    ),
  36         array( 'UncategorizedCategoriesPage',   'Uncategorizedcategories'       ),
  37         array( 'UncategorizedPagesPage',        'Uncategorizedpages'            ),
  38         array( 'UncategorizedImagesPage',       'Uncategorizedimages'           ),
  39         array( 'UncategorizedTemplatesPage',    'Uncategorizedtemplates'        ),
  40         array( 'UnusedCategoriesPage',          'Unusedcategories'              ),
  41         array( 'UnusedimagesPage',              'Unusedimages'                  ),
  42         array( 'WantedCategoriesPage',          'Wantedcategories'              ),
  43         array( 'WantedFilesPage',               'Wantedfiles'                   ),
  44         array( 'WantedPagesPage',               'Wantedpages'                   ),
  45         array( 'WantedTemplatesPage',           'Wantedtemplates'               ),
  46         array( 'UnwatchedPagesPage',            'Unwatchedpages'                ),
  47         array( 'UnusedtemplatesPage',           'Unusedtemplates'               ),
  48         array( 'WithoutInterwikiPage',          'Withoutinterwiki'              ),
  49 );
  50 wfRunHooks( 'wgQueryPages', array( &$wgQueryPages ) );
  51
  52 global $wgDisableCounters;
  53 if ( !$wgDisableCounters )
  54         $wgQueryPages[] = array( 'PopularPagesPage', 'Popularpages'             );
  55
  56
  57 /**
  58  * This is a class for doing query pages; since they're almost all the same,
  59  * we factor out some of the functionality into a superclass, and let
  60  * subclasses derive from it.
  61  * @ingroup SpecialPage
  62  */
  63 class QueryPage {
  64         /**
  65          * Whether or not we want plain listoutput rather than an ordered list
  66          *
  67          * @var bool
  68          */
  69         var $listoutput = false;
  70
  71         /**
  72          * The offset and limit in use, as passed to the query() function
  73          *
  74          * @var integer
  75          */
  76         var $offset = 0;
  77         var $limit = 0;
  78
  79         /**
  80          * A mutator for $this->listoutput;
  81          *
  82          * @param $bool Boolean
  83          */
  84         function setListoutput( $bool ) {
  85                 $this->listoutput = $bool;
  86         }
  87
  88         /**
  89          * Subclasses return their name here. Make sure the name is also
  90          * specified in SpecialPage.php and in Language.php as a language message
  91          * param.
  92          *
  93          * @return String
  94          */
  95         function getName() {
  96                 return '';
  97         }
  98
  99         /**
 100          * Return title object representing this page
 101          *
 102          * @return Title
 103          */
 104         function getTitle() {
 105                 return SpecialPage::getTitleFor( $this->getName() );
 106         }
 107
 108         /**
 109          * Subclasses return an SQL query here.
 110          *
 111          * Note that the query itself should return the following four columns:
 112          * 'type' (your special page's name), 'namespace', 'title', and 'value'
 113          * *in that order*. 'value' is used for sorting.
 114          *
 115          * These may be stored in the querycache table for expensive queries,
 116          * and that cached data will be returned sometimes, so the presence of
 117          * extra fields can't be relied upon. The cached 'value' column will be
 118          * an integer; non-numeric values are useful only for sorting the initial
 119          * query.
 120          *
 121          * Don't include an ORDER or LIMIT clause, this will be added.
 122          */
 123         function getSQL() {
 124                 return "SELECT 'sample' as type, 0 as namespace, 'Sample result' as title, 42 as value";
 125         }
 126
 127         /**
 128          * Override to sort by increasing values
 129          *
 130          * @return Boolean
 131          */
 132         function sortDescending() {
 133                 return true;
 134         }
 135
 136         function getOrder() {
 137                 return ' ORDER BY value ' .
 138                         ($this->sortDescending() ? 'DESC' : '');
 139         }
 140
 141         /**
 142          * Is this query expensive (for some definition of expensive)? Then we
 143          * don't let it run in miser mode. $wgDisableQueryPages causes all query
 144          * pages to be declared expensive. Some query pages are always expensive.
 145          *
 146          * @return Boolean
 147          */
 148         function isExpensive() {
 149                 global $wgDisableQueryPages;
 150                 return $wgDisableQueryPages;
 151         }
 152
 153         /**
 154          * Whether or not the output of the page in question is retrived from
 155          * the database cache.
 156          *
 157          * @return Boolean
 158          */
 159         function isCached() {
 160                 global $wgMiserMode;
 161
 162                 return $this->isExpensive() && $wgMiserMode;
 163         }
 164
 165         /**
 166          * Sometime we dont want to build rss / atom feeds.
 167          *
 168          * @return Boolean
 169          */
 170         function isSyndicated() {
 171                 return true;
 172         }
 173
 174         /**
 175          * Formats the results of the query for display. The skin is the current
 176          * skin; you can use it for making links. The result is a single row of
 177          * result data. You should be able to grab SQL results off of it.
 178          * If the function return "false", the line output will be skipped.
 179          *
 180          * @param $skin Skin object
 181          * @param $result Object: database row
 182          */
 183         function formatResult( $skin, $result ) {
 184                 return '';
 185         }
 186
 187         /**
 188          * The content returned by this function will be output before any result
 189          *
 190          * @return String
 191          */
 192         function getPageHeader() {
 193                 return '';
 194         }
 195
 196         /**
 197          * If using extra form wheely-dealies, return a set of parameters here
 198          * as an associative array. They will be encoded and added to the paging
 199          * links (prev/next/lengths).
 200          *
 201          * @return Array
 202          */
 203         function linkParameters() {
 204                 return array();
 205         }
 206
 207         /**
 208          * Some special pages (for example SpecialListusers) might not return the
 209          * current object formatted, but return the previous one instead.
 210          * Setting this to return true, will call one more time wfFormatResult to
 211          * be sure that the very last result is formatted and shown.
 212          */
 213         function tryLastResult() {
 214                 return false;
 215         }
 216
 217         /**
 218          * Clear the cache and save new results
 219          *
 220          * @param $limit Integer: limit for SQL statement
 221          * @param $ignoreErrors Boolean: whether to ignore database errors
 222          */
 223         function recache( $limit, $ignoreErrors = true ) {
 224                 $fname = get_class( $this ) . '::recache';
 225                 $dbw = wfGetDB( DB_MASTER );
 226                 $dbr = wfGetDB( DB_SLAVE, array( $this->getName(), __METHOD__, 'vslow' ) );
 227                 if ( !$dbw || !$dbr ) {
 228                         return false;
 229                 }
 230
 231                 $querycache = $dbr->tableName( 'querycache' );
 232
 233                 if ( $ignoreErrors ) {
 234                         $ignoreW = $dbw->ignoreErrors( true );
 235                         $ignoreR = $dbr->ignoreErrors( true );
 236                 }
 237
 238                 # Clear out any old cached data
 239                 $dbw->delete( 'querycache', array( 'qc_type' => $this->getName() ), $fname );
 240                 # Do query
 241                 $sql = $this->getSQL() . $this->getOrder();
 242                 if ( $limit !== false )
 243                         $sql = $dbr->limitResult( $sql, $limit, 0 );
 244                 $res = $dbr->query( $sql, $fname );
 245                 $num = false;
 246                 if ( $res ) {
 247                         $num = $dbr->numRows( $res );
 248                         # Fetch results
 249                         $vals = array();
 250                         while ( $res && $row = $dbr->fetchObject( $res ) ) {
 251                                 if ( isset( $row->value ) ) {
 252                                         $value = intval( $row->value ); // @bug 14414
 253                                 } else {
 254                                         $value = 0;
 255                                 }
 256
 257                                 $vals[] = array('qc_type' => $row->type,
 258                                                 'qc_namespace' => $row->namespace,
 259                                                 'qc_title' => $row->title,
 260                                                 'qc_value' => $value);
 261                         }
 262
 263                         # Save results into the querycache table on the master
 264                         if ( count( $vals ) ) {
 265                                 if ( !$dbw->insert( 'querycache', $vals, __METHOD__ ) ) {
 266                                         // Set result to false to indicate error
 267                                         $dbr->freeResult( $res );
 268                                         $res = false;
 269                                 }
 270                         }
 271                         if ( $res ) {
 272                                 $dbr->freeResult( $res );
 273                         }
 274                         if ( $ignoreErrors ) {
 275                                 $dbw->ignoreErrors( $ignoreW );
 276                                 $dbr->ignoreErrors( $ignoreR );
 277                         }
 278
 279                         # Update the querycache_info record for the page
 280                         $dbw->delete( 'querycache_info', array( 'qci_type' => $this->getName() ), $fname );
 281                         $dbw->insert( 'querycache_info', array( 'qci_type' => $this->getName(), 'qci_timestamp' => $dbw->timestamp() ), $fname );
 282
 283                 }
 284                 return $num;
 285         }
 286
 287         /**
 288          * This is the actual workhorse. It does everything needed to make a
 289          * real, honest-to-gosh query page.
 290          *
 291          * @param $offset database query offset
 292          * @param $limit database query limit
 293          * @param $shownavigation show navigation like "next 200"?
 294          */
 295         function doQuery( $offset, $limit, $shownavigation=true ) {
 296                 global $wgUser, $wgOut, $wgLang, $wgContLang;
 297
 298                 $this->offset = $offset;
 299                 $this->limit = $limit;
 300
 301                 $sname = $this->getName();
 302                 $fname = get_class($this) . '::doQuery';
 303                 $dbr = wfGetDB( DB_SLAVE );
 304
 305                 $wgOut->setSyndicated( $this->isSyndicated() );
 306
 307                 if ( !$this->isCached() ) {
 308                         $sql = $this->getSQL();
 309                 } else {
 310                         # Get the cached result
 311                         $querycache = $dbr->tableName( 'querycache' );
 312                         $type = $dbr->strencode( $sname );
 313                         $sql =
 314                                 "SELECT qc_type as type, qc_namespace as namespace,qc_title as title, qc_value as value
 315                                  FROM $querycache WHERE qc_type='$type'";
 316
 317                         if( !$this->listoutput ) {
 318
 319                                 # Fetch the timestamp of this update
 320                                 $tRes = $dbr->select( 'querycache_info', array( 'qci_timestamp' ), array( 'qci_type' => $type ), $fname );
 321                                 $tRow = $dbr->fetchObject( $tRes );
 322
 323                                 if( $tRow ) {
 324                                         $updated = $wgLang->timeanddate( $tRow->qci_timestamp, true, true );
 325                                         $updateddate = $wgLang->date( $tRow->qci_timestamp, true, true );
 326                                         $updatedtime = $wgLang->time( $tRow->qci_timestamp, true, true );
 327                                         $wgOut->addMeta( 'Data-Cache-Time', $tRow->qci_timestamp );
 328                                         $wgOut->addInlineScript( "var dataCacheTime = '{$tRow->qci_timestamp}';" );
 329                                         $wgOut->addWikiMsg( 'perfcachedts', $updated, $updateddate, $updatedtime );
 330                                 } else {
 331                                         $wgOut->addWikiMsg( 'perfcached' );
 332                                 }
 333
 334                                 # If updates on this page have been disabled, let the user know
 335                                 # that the data set won't be refreshed for now
 336                                 global $wgDisableQueryPageUpdate;
 337                                 if( is_array( $wgDisableQueryPageUpdate ) && in_array( $this->getName(), $wgDisableQueryPageUpdate ) ) {
 338                                         $wgOut->addWikiMsg( 'querypage-no-updates' );
 339                                 }
 340
 341                         }
 342
 343                 }
 344
 345                 $sql .= $this->getOrder();
 346                 $sql = $dbr->limitResult($sql, $limit, $offset);
 347                 $res = $dbr->query( $sql );
 348                 $num = $dbr->numRows($res);
 349
 350                 $this->preprocessResults( $dbr, $res );
 351
 352                 $wgOut->addHTML( Xml::openElement( 'div', array('class' => 'mw-spcontent') ) );
 353
 354                 # Top header and navigation
 355                 if( $shownavigation ) {
 356                         $wgOut->addHTML( $this->getPageHeader() );
 357                         if( $num > 0 ) {
 358                                 $wgOut->addHTML( '<p>' . wfShowingResults( $offset, $num ) . '</p>' );
 359                                 # Disable the "next" link when we reach the end
 360                                 $paging = wfViewPrevNext( $offset, $limit, $wgContLang->specialPage( $sname ),
 361                                         wfArrayToCGI( $this->linkParameters() ), ( $num < $limit ) );
 362                                 $wgOut->addHTML( '<p>' . $paging . '</p>' );
 363                         } else {
 364                                 # No results to show, so don't bother with "showing X of Y" etc.
 365                                 # -- just let the user know and give up now
 366                                 $wgOut->addHTML( '<p>' . wfMsgHtml( 'specialpage-empty' ) . '</p>' );
 367                                 $wgOut->addHTML( Xml::closeElement( 'div' ) );
 368                                 return;
 369                         }
 370                 }
 371
 372                 # The actual results; specialist subclasses will want to handle this
 373                 # with more than a straight list, so we hand them the info, plus
 374                 # an OutputPage, and let them get on with it
 375                 $this->outputResults( $wgOut,
 376                         $wgUser->getSkin(),
 377                         $dbr, # Should use a ResultWrapper for this
 378                         $res,
 379                         $dbr->numRows( $res ),
 380                         $offset );
 381
 382                 # Repeat the paging links at the bottom
 383                 if( $shownavigation ) {
 384                         $wgOut->addHTML( '<p>' . $paging . '</p>' );
 385                 }
 386
 387                 $wgOut->addHTML( Xml::closeElement( 'div' ) );
 388
 389                 return $num;
 390         }
 391
 392         /**
 393          * Format and output report results using the given information plus
 394          * OutputPage
 395          *
 396          * @param $out OutputPage to print to
 397          * @param $skin Skin: user skin to use
 398          * @param $dbr Database (read) connection to use
 399          * @param $res Integer: result pointer
 400          * @param $num Integer: number of available result rows
 401          * @param $offset Integer: paging offset
 402          */
 403         protected function outputResults( $out, $skin, $dbr, $res, $num, $offset ) {
 404                 global $wgContLang;
 405
 406                 if( $num > 0 ) {
 407                         $html = array();
 408                         if( !$this->listoutput )
 409                                 $html[] = $this->openList( $offset );
 410
 411                         # $res might contain the whole 1,000 rows, so we read up to
 412                         # $num [should update this to use a Pager]
 413                         for( $i = 0; $i < $num && $row = $dbr->fetchObject( $res ); $i++ ) {
 414                                 $line = $this->formatResult( $skin, $row );
 415                                 if( $line ) {
 416                                         $attr = ( isset( $row->usepatrol ) && $row->usepatrol && $row->patrolled == 0 )
 417                                                 ? ' class="not-patrolled"'
 418                                                 : '';
 419                                         $html[] = $this->listoutput
 420                                                 ? $line
 421                                                 : "<li{$attr}>{$line}</li>\n";
 422                                 }
 423                         }
 424
 425                         # Flush the final result
 426                         if( $this->tryLastResult() ) {
 427                                 $row = null;
 428                                 $line = $this->formatResult( $skin, $row );
 429                                 if( $line ) {
 430                                         $attr = ( isset( $row->usepatrol ) && $row->usepatrol && $row->patrolled == 0 )
 431                                                 ? ' class="not-patrolled"'
 432                                                 : '';
 433                                         $html[] = $this->listoutput
 434                                                 ? $line
 435                                                 : "<li{$attr}>{$line}</li>\n";
 436                                 }
 437                         }
 438
 439                         if( !$this->listoutput )
 440                                 $html[] = $this->closeList();
 441
 442                         $html = $this->listoutput
 443                                 ? $wgContLang->listToText( $html )
 444                                 : implode( '', $html );
 445
 446                         $out->addHTML( $html );
 447                 }
 448         }
 449
 450         function openList( $offset ) {
 451                 return "\n<ol start='" . ( $offset + 1 ) . "' class='special'>\n";
 452         }
 453
 454         function closeList() {
 455                 return "</ol>\n";
 456         }
 457
 458         /**
 459          * Do any necessary preprocessing of the result object.
 460          */
 461         function preprocessResults( $db, $res ) {}
 462
 463         /**
 464          * Similar to above, but packaging in a syndicated feed instead of a web page
 465          */
 466         function doFeed( $class = '', $limit = 50 ) {
 467                 global $wgFeed, $wgFeedClasses;
 468
 469                 if ( !$wgFeed ) {
 470                         global $wgOut;
 471                         $wgOut->addWikiMsg( 'feed-unavailable' );
 472                         return;
 473                 }
 474
 475                 global $wgFeedLimit;
 476                 if( $limit > $wgFeedLimit ) {
 477                         $limit = $wgFeedLimit;
 478                 }
 479
 480                 if( isset($wgFeedClasses[$class]) ) {
 481                         $feed = new $wgFeedClasses[$class](
 482                                 $this->feedTitle(),
 483                                 $this->feedDesc(),
 484                                 $this->feedUrl() );
 485                         $feed->outHeader();
 486
 487                         $dbr = wfGetDB( DB_SLAVE );
 488                         $sql = $this->getSQL() . $this->getOrder();
 489                         $sql = $dbr->limitResult( $sql, $limit, 0 );
 490                         $res = $dbr->query( $sql, 'QueryPage::doFeed' );
 491                         while( $obj = $dbr->fetchObject( $res ) ) {
 492                                 $item = $this->feedResult( $obj );
 493                                 if( $item ) $feed->outItem( $item );
 494                         }
 495                         $dbr->freeResult( $res );
 496
 497                         $feed->outFooter();
 498                         return true;
 499                 } else {
 500                         return false;
 501                 }
 502         }
 503
 504         /**
 505          * Override for custom handling. If the titles/links are ok, just do
 506          * feedItemDesc()
 507          */
 508         function feedResult( $row ) {
 509                 if( !isset( $row->title ) ) {
 510                         return null;
 511                 }
 512                 $title = Title::MakeTitle( intval( $row->namespace ), $row->title );
 513                 if( $title ) {
 514                         $date = isset( $row->timestamp ) ? $row->timestamp : '';
 515                         $comments = '';
 516                         if( $title ) {
 517                                 $talkpage = $title->getTalkPage();
 518                                 $comments = $talkpage->getFullURL();
 519                         }
 520
 521                         return new FeedItem(
 522                                 $title->getPrefixedText(),
 523                                 $this->feedItemDesc( $row ),
 524                                 $title->getFullURL(),
 525                                 $date,
 526                                 $this->feedItemAuthor( $row ),
 527                                 $comments);
 528                 } else {
 529                         return null;
 530                 }
 531         }
 532
 533         function feedItemDesc( $row ) {
 534                 return isset( $row->comment ) ? htmlspecialchars( $row->comment ) : '';
 535         }
 536
 537         function feedItemAuthor( $row ) {
 538                 return isset( $row->user_text ) ? $row->user_text : '';
 539         }
 540
 541         function feedTitle() {
 542                 global $wgContLanguageCode, $wgSitename;
 543                 $page = SpecialPage::getPage( $this->getName() );
 544                 $desc = $page->getDescription();
 545                 return "$wgSitename - $desc [$wgContLanguageCode]";
 546         }
 547
 548         function feedDesc() {
 549                 return wfMsgExt( 'tagline', 'parsemag' );
 550         }
 551
 552         function feedUrl() {
 553                 $title = SpecialPage::getTitleFor( $this->getName() );
 554                 return $title->getFullURL();
 555         }
 556 }
 557
 558 /**
 559  * Class definition for a wanted query page like
 560  * WantedPages, WantedTemplates, etc
 561  */
 562 abstract class WantedQueryPage extends QueryPage {
 563
 564         function isExpensive() {
 565                 return true;
 566         }
 567
 568         function isSyndicated() {
 569                 return false;
 570         }
 571
 572         /**
 573          * Cache page existence for performance
 574          */
 575         function preprocessResults( $db, $res ) {
 576                 $batch = new LinkBatch;
 577                 while ( $row = $db->fetchObject( $res ) )
 578                         $batch->add( $row->namespace, $row->title );
 579                 $batch->execute();
 580
 581                 // Back to start for display
 582                 if ( $db->numRows( $res ) > 0 )
 583                         // If there are no rows we get an error seeking.
 584                         $db->dataSeek( $res, 0 );
 585         }
 586
 587         /**
 588          * Format an individual result
 589          *
 590          * @param $skin Skin to use for UI elements
 591          * @param $result Result row
 592          * @return string
 593          */
 594         public function formatResult( $skin, $result ) {
 595                 $title = Title::makeTitleSafe( $result->namespace, $result->title );
 596                 if( $title instanceof Title ) {
 597                         if( $this->isCached() ) {
 598                                 $pageLink = $title->exists()
 599                                         ? '<del>' . $skin->link( $title ) . '</del>'
 600                                         : $skin->link(
 601                                                 $title,
 602                                                 null,
 603                                                 array(),
 604                                                 array(),
 605                                                 array( 'broken' )
 606                                         );
 607                         } else {
 608                                 $pageLink = $skin->link(
 609                                         $title,
 610                                         null,
 611                                         array(),
 612                                         array(),
 613                                         array( 'broken' )
 614                                 );
 615                         }
 616                         return wfSpecialList( $pageLink, $this->makeWlhLink( $title, $skin, $result ) );
 617                 } else {
 618                         $tsafe = htmlspecialchars( $result->title );
 619                         return wfMsgHtml( 'wantedpages-badtitle', $tsafe );
 620                 }
 621         }
 622
 623         /**
 624          * Make a "what links here" link for a given title
 625          *
 626          * @param $title Title to make the link for
 627          * @param $skin Skin object to use
 628          * @param $result Object: result row
 629          * @return string
 630          */
 631         private function makeWlhLink( $title, $skin, $result ) {
 632                 global $wgLang;
 633                 $wlh = SpecialPage::getTitleFor( 'Whatlinkshere' );
 634                 $label = wfMsgExt( 'nlinks', array( 'parsemag', 'escape' ),
 635                 $wgLang->formatNum( $result->value ) );
 636                 return $skin->link( $wlh, $label, array(), array( 'target' => $title->getPrefixedText() ) );
 637         }
 638 }