includes/specialpage/QueryPage.php

   1 <?php
   2 /**
   3  * Base code for "query" special pages.
   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  * @ingroup SpecialPage
  22  */
  23
  24 /**
  25  * This is a class for doing query pages; since they're almost all the same,
  26  * we factor out some of the functionality into a superclass, and let
  27  * subclasses derive from it.
  28  * @ingroup SpecialPage
  29  */
  30 abstract class QueryPage extends SpecialPage {
  31         /** @var bool Whether or not we want plain listoutput rather than an ordered list */
  32         protected $listoutput = false;
  33
  34         /** @var int The offset and limit in use, as passed to the query() function */
  35         protected $offset = 0;
  36
  37         /** @var int */
  38         protected $limit = 0;
  39
  40         /**
  41          * The number of rows returned by the query. Reading this variable
  42          * only makes sense in functions that are run after the query has been
  43          * done, such as preprocessResults() and formatRow().
  44          */
  45         protected $numRows;
  46
  47         protected $cachedTimestamp = null;
  48
  49         /**
  50          * Whether to show prev/next links
  51          */
  52         protected $shownavigation = true;
  53
  54         /**
  55          * Get a list of query page classes and their associated special pages,
  56          * for periodic updates.
  57          *
  58          * DO NOT CHANGE THIS LIST without testing that
  59          * maintenance/updateSpecialPages.php still works.
  60          * @return array
  61          */
  62         public static function getPages() {
  63                 static $qp = null;
  64
  65                 if ( $qp === null ) {
  66                         // QueryPage subclass, Special page name
  67                         $qp = [
  68                                 [ 'AncientPagesPage', 'Ancientpages' ],
  69                                 [ 'BrokenRedirectsPage', 'BrokenRedirects' ],
  70                                 [ 'DeadendPagesPage', 'Deadendpages' ],
  71                                 [ 'DoubleRedirectsPage', 'DoubleRedirects' ],
  72                                 [ 'FileDuplicateSearchPage', 'FileDuplicateSearch' ],
  73                                 [ 'ListDuplicatedFilesPage', 'ListDuplicatedFiles' ],
  74                                 [ 'LinkSearchPage', 'LinkSearch' ],
  75                                 [ 'ListredirectsPage', 'Listredirects' ],
  76                                 [ 'LonelyPagesPage', 'Lonelypages' ],
  77                                 [ 'LongPagesPage', 'Longpages' ],
  78                                 [ 'MediaStatisticsPage', 'MediaStatistics' ],
  79                                 [ 'MIMEsearchPage', 'MIMEsearch' ],
  80                                 [ 'MostcategoriesPage', 'Mostcategories' ],
  81                                 [ 'MostimagesPage', 'Mostimages' ],
  82                                 [ 'MostinterwikisPage', 'Mostinterwikis' ],
  83                                 [ 'MostlinkedCategoriesPage', 'Mostlinkedcategories' ],
  84                                 [ 'MostlinkedTemplatesPage', 'Mostlinkedtemplates' ],
  85                                 [ 'MostlinkedPage', 'Mostlinked' ],
  86                                 [ 'MostrevisionsPage', 'Mostrevisions' ],
  87                                 [ 'FewestrevisionsPage', 'Fewestrevisions' ],
  88                                 [ 'ShortPagesPage', 'Shortpages' ],
  89                                 [ 'UncategorizedCategoriesPage', 'Uncategorizedcategories' ],
  90                                 [ 'UncategorizedPagesPage', 'Uncategorizedpages' ],
  91                                 [ 'UncategorizedImagesPage', 'Uncategorizedimages' ],
  92                                 [ 'UncategorizedTemplatesPage', 'Uncategorizedtemplates' ],
  93                                 [ 'UnusedCategoriesPage', 'Unusedcategories' ],
  94                                 [ 'UnusedimagesPage', 'Unusedimages' ],
  95                                 [ 'WantedCategoriesPage', 'Wantedcategories' ],
  96                                 [ 'WantedFilesPage', 'Wantedfiles' ],
  97                                 [ 'WantedPagesPage', 'Wantedpages' ],
  98                                 [ 'WantedTemplatesPage', 'Wantedtemplates' ],
  99                                 [ 'UnwatchedpagesPage', 'Unwatchedpages' ],
 100                                 [ 'UnusedtemplatesPage', 'Unusedtemplates' ],
 101                                 [ 'WithoutInterwikiPage', 'Withoutinterwiki' ],
 102                         ];
 103                         Hooks::run( 'wgQueryPages', [ &$qp ] );
 104                 }
 105
 106                 return $qp;
 107         }
 108
 109         /**
 110          * A mutator for $this->listoutput;
 111          *
 112          * @param bool $bool
 113          */
 114         function setListoutput( $bool ) {
 115                 $this->listoutput = $bool;
 116         }
 117
 118         /**
 119          * Subclasses return an SQL query here, formatted as an array with the
 120          * following keys:
 121          *    tables => Table(s) for passing to Database::select()
 122          *    fields => Field(s) for passing to Database::select(), may be *
 123          *    conds => WHERE conditions
 124          *    options => options
 125          *    join_conds => JOIN conditions
 126          *
 127          * Note that the query itself should return the following three columns:
 128          * 'namespace', 'title', and 'value'. 'value' is used for sorting.
 129          *
 130          * These may be stored in the querycache table for expensive queries,
 131          * and that cached data will be returned sometimes, so the presence of
 132          * extra fields can't be relied upon. The cached 'value' column will be
 133          * an integer; non-numeric values are useful only for sorting the
 134          * initial query (except if they're timestamps, see usesTimestamps()).
 135          *
 136          * Don't include an ORDER or LIMIT clause, they will be added.
 137          *
 138          * If this function is not overridden or returns something other than
 139          * an array, getSQL() will be used instead. This is for backwards
 140          * compatibility only and is strongly deprecated.
 141          * @return array
 142          * @since 1.18
 143          */
 144         public function getQueryInfo() {
 145                 return null;
 146         }
 147
 148         /**
 149          * For back-compat, subclasses may return a raw SQL query here, as a string.
 150          * This is strongly deprecated; getQueryInfo() should be overridden instead.
 151          * @throws MWException
 152          * @return string
 153          */
 154         function getSQL() {
 155                 /* Implement getQueryInfo() instead */
 156                 throw new MWException( "Bug in a QueryPage: doesn't implement getQueryInfo() nor "
 157                         . "getQuery() properly" );
 158         }
 159
 160         /**
 161          * Subclasses return an array of fields to order by here. Don't append
 162          * DESC to the field names, that'll be done automatically if
 163          * sortDescending() returns true.
 164          * @return array
 165          * @since 1.18
 166          */
 167         function getOrderFields() {
 168                 return [ 'value' ];
 169         }
 170
 171         /**
 172          * Does this query return timestamps rather than integers in its
 173          * 'value' field? If true, this class will convert 'value' to a
 174          * UNIX timestamp for caching.
 175          * NOTE: formatRow() may get timestamps in TS_MW (mysql), TS_DB (pgsql)
 176          *       or TS_UNIX (querycache) format, so be sure to always run them
 177          *       through wfTimestamp()
 178          * @return bool
 179          * @since 1.18
 180          */
 181         public function usesTimestamps() {
 182                 return false;
 183         }
 184
 185         /**
 186          * Override to sort by increasing values
 187          *
 188          * @return bool
 189          */
 190         function sortDescending() {
 191                 return true;
 192         }
 193
 194         /**
 195          * Is this query expensive (for some definition of expensive)? Then we
 196          * don't let it run in miser mode. $wgDisableQueryPages causes all query
 197          * pages to be declared expensive. Some query pages are always expensive.
 198          *
 199          * @return bool
 200          */
 201         public function isExpensive() {
 202                 return $this->getConfig()->get( 'DisableQueryPages' );
 203         }
 204
 205         /**
 206          * Is the output of this query cacheable? Non-cacheable expensive pages
 207          * will be disabled in miser mode and will not have their results written
 208          * to the querycache table.
 209          * @return bool
 210          * @since 1.18
 211          */
 212         public function isCacheable() {
 213                 return true;
 214         }
 215
 216         /**
 217          * Whether or not the output of the page in question is retrieved from
 218          * the database cache.
 219          *
 220          * @return bool
 221          */
 222         public function isCached() {
 223                 return $this->isExpensive() && $this->getConfig()->get( 'MiserMode' );
 224         }
 225
 226         /**
 227          * Sometime we don't want to build rss / atom feeds.
 228          *
 229          * @return bool
 230          */
 231         function isSyndicated() {
 232                 return true;
 233         }
 234
 235         /**
 236          * Formats the results of the query for display. The skin is the current
 237          * skin; you can use it for making links. The result is a single row of
 238          * result data. You should be able to grab SQL results off of it.
 239          * If the function returns false, the line output will be skipped.
 240          * @param Skin $skin
 241          * @param object $result Result row
 242          * @return string|bool String or false to skip
 243          */
 244         abstract function formatResult( $skin, $result );
 245
 246         /**
 247          * The content returned by this function will be output before any result
 248          *
 249          * @return string
 250          */
 251         function getPageHeader() {
 252                 return '';
 253         }
 254
 255         /**
 256          * Outputs some kind of an informative message (via OutputPage) to let the
 257          * user know that the query returned nothing and thus there's nothing to
 258          * show.
 259          *
 260          * @since 1.26
 261          */
 262         protected function showEmptyText() {
 263                 $this->getOutput()->addWikiMsg( 'specialpage-empty' );
 264         }
 265
 266         /**
 267          * If using extra form wheely-dealies, return a set of parameters here
 268          * as an associative array. They will be encoded and added to the paging
 269          * links (prev/next/lengths).
 270          *
 271          * @return array
 272          */
 273         function linkParameters() {
 274                 return [];
 275         }
 276
 277         /**
 278          * Some special pages (for example SpecialListusers used to) might not return the
 279          * current object formatted, but return the previous one instead.
 280          * Setting this to return true will ensure formatResult() is called
 281          * one more time to make sure that the very last result is formatted
 282          * as well.
 283          *
 284          * @deprecated since 1.27
 285          *
 286          * @return bool
 287          */
 288         function tryLastResult() {
 289                 return false;
 290         }
 291
 292         /**
 293          * Clear the cache and save new results
 294          *
 295          * @param int|bool $limit Limit for SQL statement
 296          * @param bool $ignoreErrors Whether to ignore database errors
 297          * @throws DBError|Exception
 298          * @return bool|int
 299          */
 300         public function recache( $limit, $ignoreErrors = true ) {
 301                 if ( !$this->isCacheable() ) {
 302                         return 0;
 303                 }
 304
 305                 $fname = get_class( $this ) . '::recache';
 306                 $dbw = wfGetDB( DB_MASTER );
 307                 if ( !$dbw ) {
 308                         return false;
 309                 }
 310
 311                 try {
 312                         # Do query
 313                         $res = $this->reallyDoQuery( $limit, false );
 314                         $num = false;
 315                         if ( $res ) {
 316                                 $num = $res->numRows();
 317                                 # Fetch results
 318                                 $vals = [];
 319                                 foreach ( $res as $row ) {
 320                                         if ( isset( $row->value ) ) {
 321                                                 if ( $this->usesTimestamps() ) {
 322                                                         $value = wfTimestamp( TS_UNIX,
 323                                                                 $row->value );
 324                                                 } else {
 325                                                         $value = intval( $row->value ); // @bug 14414
 326                                                 }
 327                                         } else {
 328                                                 $value = 0;
 329                                         }
 330
 331                                         $vals[] = [
 332                                                 'qc_type' => $this->getName(),
 333                                                 'qc_namespace' => $row->namespace,
 334                                                 'qc_title' => $row->title,
 335                                                 'qc_value' => $value
 336                                         ];
 337                                 }
 338
 339                                 $dbw->doAtomicSection(
 340                                         __METHOD__,
 341                                         function ( IDatabase $dbw, $fname ) use ( $vals ) {
 342                                                 # Clear out any old cached data
 343                                                 $dbw->delete( 'querycache',
 344                                                         [ 'qc_type' => $this->getName() ],
 345                                                         $fname
 346                                                 );
 347                                                 # Save results into the querycache table on the master
 348                                                 if ( count( $vals ) ) {
 349                                                         $dbw->insert( 'querycache', $vals, $fname );
 350                                                 }
 351                                                 # Update the querycache_info record for the page
 352                                                 $dbw->delete( 'querycache_info',
 353                                                         [ 'qci_type' => $this->getName() ],
 354                                                         $fname
 355                                                 );
 356                                                 $dbw->insert( 'querycache_info',
 357                                                         [ 'qci_type' => $this->getName(),
 358                                                                 'qci_timestamp' => $dbw->timestamp() ],
 359                                                         $fname
 360                                                 );
 361                                         }
 362                                 );
 363                         }
 364                 } catch ( DBError $e ) {
 365                         if ( !$ignoreErrors ) {
 366                                 throw $e; // report query error
 367                         }
 368                         $num = false; // set result to false to indicate error
 369                 }
 370
 371                 return $num;
 372         }
 373
 374         /**
 375          * Get a DB connection to be used for slow recache queries
 376          * @return IDatabase
 377          */
 378         function getRecacheDB() {
 379                 return wfGetDB( DB_REPLICA, [ $this->getName(), 'QueryPage::recache', 'vslow' ] );
 380         }
 381
 382         /**
 383          * Run the query and return the result
 384          * @param int|bool $limit Numerical limit or false for no limit
 385          * @param int|bool $offset Numerical offset or false for no offset
 386          * @return ResultWrapper
 387          * @since 1.18
 388          */
 389         public function reallyDoQuery( $limit, $offset = false ) {
 390                 $fname = get_class( $this ) . "::reallyDoQuery";
 391                 $dbr = $this->getRecacheDB();
 392                 $query = $this->getQueryInfo();
 393                 $order = $this->getOrderFields();
 394
 395                 if ( $this->sortDescending() ) {
 396                         foreach ( $order as &$field ) {
 397                                 $field .= ' DESC';
 398                         }
 399                 }
 400
 401                 if ( is_array( $query ) ) {
 402                         $tables = isset( $query['tables'] ) ? (array)$query['tables'] : [];
 403                         $fields = isset( $query['fields'] ) ? (array)$query['fields'] : [];
 404                         $conds = isset( $query['conds'] ) ? (array)$query['conds'] : [];
 405                         $options = isset( $query['options'] ) ? (array)$query['options'] : [];
 406                         $join_conds = isset( $query['join_conds'] ) ? (array)$query['join_conds'] : [];
 407
 408                         if ( count( $order ) ) {
 409                                 $options['ORDER BY'] = $order;
 410                         }
 411
 412                         if ( $limit !== false ) {
 413                                 $options['LIMIT'] = intval( $limit );
 414                         }
 415
 416                         if ( $offset !== false ) {
 417                                 $options['OFFSET'] = intval( $offset );
 418                         }
 419
 420                         $res = $dbr->select( $tables, $fields, $conds, $fname,
 421                                         $options, $join_conds
 422                         );
 423                 } else {
 424                         // Old-fashioned raw SQL style, deprecated
 425                         $sql = $this->getSQL();
 426                         $sql .= ' ORDER BY ' . implode( ', ', $order );
 427                         $sql = $dbr->limitResult( $sql, $limit, $offset );
 428                         $res = $dbr->query( $sql, $fname );
 429                 }
 430
 431                 return $res;
 432         }
 433
 434         /**
 435          * Somewhat deprecated, you probably want to be using execute()
 436          * @param int|bool $offset
 437          * @param int|bool $limit
 438          * @return ResultWrapper
 439          */
 440         public function doQuery( $offset = false, $limit = false ) {
 441                 if ( $this->isCached() && $this->isCacheable() ) {
 442                         return $this->fetchFromCache( $limit, $offset );
 443                 } else {
 444                         return $this->reallyDoQuery( $limit, $offset );
 445                 }
 446         }
 447
 448         /**
 449          * Fetch the query results from the query cache
 450          * @param int|bool $limit Numerical limit or false for no limit
 451          * @param int|bool $offset Numerical offset or false for no offset
 452          * @return ResultWrapper
 453          * @since 1.18
 454          */
 455         public function fetchFromCache( $limit, $offset = false ) {
 456                 $dbr = wfGetDB( DB_REPLICA );
 457                 $options = [];
 458                 if ( $limit !== false ) {
 459                         $options['LIMIT'] = intval( $limit );
 460                 }
 461                 if ( $offset !== false ) {
 462                         $options['OFFSET'] = intval( $offset );
 463                 }
 464                 if ( $this->sortDescending() ) {
 465                         $options['ORDER BY'] = 'qc_value DESC';
 466                 } else {
 467                         $options['ORDER BY'] = 'qc_value ASC';
 468                 }
 469                 return $dbr->select( 'querycache', [ 'qc_type',
 470                                 'namespace' => 'qc_namespace',
 471                                 'title' => 'qc_title',
 472                                 'value' => 'qc_value' ],
 473                                 [ 'qc_type' => $this->getName() ],
 474                                 __METHOD__, $options
 475                 );
 476         }
 477
 478         public function getCachedTimestamp() {
 479                 if ( is_null( $this->cachedTimestamp ) ) {
 480                         $dbr = wfGetDB( DB_REPLICA );
 481                         $fname = get_class( $this ) . '::getCachedTimestamp';
 482                         $this->cachedTimestamp = $dbr->selectField( 'querycache_info', 'qci_timestamp',
 483                                 [ 'qci_type' => $this->getName() ], $fname );
 484                 }
 485                 return $this->cachedTimestamp;
 486         }
 487
 488         /**
 489          * Returns limit and offset, as returned by $this->getRequest()->getLimitOffset().
 490          * Subclasses may override this to further restrict or modify limit and offset.
 491          *
 492          * @note Restricts the offset parameter, as most query pages have inefficient paging
 493          *
 494          * Its generally expected that the returned limit will not be 0, and the returned
 495          * offset will be less than the max results.
 496          *
 497          * @since 1.26
 498          * @return int[] list( $limit, $offset )
 499          */
 500         protected function getLimitOffset() {
 501                 list( $limit, $offset ) = $this->getRequest()->getLimitOffset();
 502                 if ( $this->getConfig()->get( 'MiserMode' ) ) {
 503                         $maxResults = $this->getMaxResults();
 504                         // Can't display more than max results on a page
 505                         $limit = min( $limit, $maxResults );
 506                         // Can't skip over more than the end of $maxResults
 507                         $offset = min( $offset, $maxResults + 1 );
 508                 }
 509                 return [ $limit, $offset ];
 510         }
 511
 512         /**
 513          * What is limit to fetch from DB
 514          *
 515          * Used to make it appear the DB stores less results then it actually does
 516          * @param int $uiLimit Limit from UI
 517          * @param int $uiOffset Offset from UI
 518          * @return int Limit to use for DB (not including extra row to see if at end)
 519          */
 520         protected function getDBLimit( $uiLimit, $uiOffset ) {
 521                 $maxResults = $this->getMaxResults();
 522                 if ( $this->getConfig()->get( 'MiserMode' ) ) {
 523                         $limit = min( $uiLimit + 1, $maxResults - $uiOffset );
 524                         return max( $limit, 0 );
 525                 } else {
 526                         return $uiLimit + 1;
 527                 }
 528         }
 529
 530         /**
 531          * Get max number of results we can return in miser mode.
 532          *
 533          * Most QueryPage subclasses use inefficient paging, so limit the max amount we return
 534          * This matters for uncached query pages that might otherwise accept an offset of 3 million
 535          *
 536          * @since 1.27
 537          * @return int
 538          */
 539         protected function getMaxResults() {
 540                 // Max of 10000, unless we store more than 10000 in query cache.
 541                 return max( $this->getConfig()->get( 'QueryCacheLimit' ), 10000 );
 542         }
 543
 544         /**
 545          * This is the actual workhorse. It does everything needed to make a
 546          * real, honest-to-gosh query page.
 547          * @param string $par
 548          */
 549         public function execute( $par ) {
 550                 $user = $this->getUser();
 551                 if ( !$this->userCanExecute( $user ) ) {
 552                         $this->displayRestrictionError();
 553                         return;
 554                 }
 555
 556                 $this->setHeaders();
 557                 $this->outputHeader();
 558
 559                 $out = $this->getOutput();
 560
 561                 if ( $this->isCached() && !$this->isCacheable() ) {
 562                         $out->addWikiMsg( 'querypage-disabled' );
 563                         return;
 564                 }
 565
 566                 $out->setSyndicated( $this->isSyndicated() );
 567
 568                 if ( $this->limit == 0 && $this->offset == 0 ) {
 569                         list( $this->limit, $this->offset ) = $this->getLimitOffset();
 570                 }
 571                 $dbLimit = $this->getDBLimit( $this->limit, $this->offset );
 572                 // @todo Use doQuery()
 573                 if ( !$this->isCached() ) {
 574                         # select one extra row for navigation
 575                         $res = $this->reallyDoQuery( $dbLimit, $this->offset );
 576                 } else {
 577                         # Get the cached result, select one extra row for navigation
 578                         $res = $this->fetchFromCache( $dbLimit, $this->offset );
 579                         if ( !$this->listoutput ) {
 580
 581                                 # Fetch the timestamp of this update
 582                                 $ts = $this->getCachedTimestamp();
 583                                 $lang = $this->getLanguage();
 584                                 $maxResults = $lang->formatNum( $this->getConfig()->get( 'QueryCacheLimit' ) );
 585
 586                                 if ( $ts ) {
 587                                         $updated = $lang->userTimeAndDate( $ts, $user );
 588                                         $updateddate = $lang->userDate( $ts, $user );
 589                                         $updatedtime = $lang->userTime( $ts, $user );
 590                                         $out->addMeta( 'Data-Cache-Time', $ts );
 591                                         $out->addJsConfigVars( 'dataCacheTime', $ts );
 592                                         $out->addWikiMsg( 'perfcachedts', $updated, $updateddate, $updatedtime, $maxResults );
 593                                 } else {
 594                                         $out->addWikiMsg( 'perfcached', $maxResults );
 595                                 }
 596
 597                                 # If updates on this page have been disabled, let the user know
 598                                 # that the data set won't be refreshed for now
 599                                 if ( is_array( $this->getConfig()->get( 'DisableQueryPageUpdate' ) )
 600                                         && in_array( $this->getName(), $this->getConfig()->get( 'DisableQueryPageUpdate' ) )
 601                                 ) {
 602                                         $out->wrapWikiMsg(
 603                                                 "<div class=\"mw-querypage-no-updates\">\n$1\n</div>",
 604                                                 'querypage-no-updates'
 605                                         );
 606                                 }
 607                         }
 608                 }
 609
 610                 $this->numRows = $res->numRows();
 611
 612                 $dbr = $this->getRecacheDB();
 613                 $this->preprocessResults( $dbr, $res );
 614
 615                 $out->addHTML( Xml::openElement( 'div', [ 'class' => 'mw-spcontent' ] ) );
 616
 617                 # Top header and navigation
 618                 if ( $this->shownavigation ) {
 619                         $out->addHTML( $this->getPageHeader() );
 620                         if ( $this->numRows > 0 ) {
 621                                 $out->addHTML( $this->msg( 'showingresultsinrange' )->numParams(
 622                                         min( $this->numRows, $this->limit ), # do not show the one extra row, if exist
 623                                         $this->offset + 1, ( min( $this->numRows, $this->limit ) + $this->offset ) )->parseAsBlock() );
 624                                 # Disable the "next" link when we reach the end
 625                                 $miserMaxResults = $this->getConfig()->get( 'MiserMode' )
 626                                         && ( $this->offset + $this->limit >= $this->getMaxResults() );
 627                                 $atEnd = ( $this->numRows <= $this->limit ) || $miserMaxResults;
 628                                 $paging = $this->getLanguage()->viewPrevNext( $this->getPageTitle( $par ), $this->offset,
 629                                         $this->limit, $this->linkParameters(), $atEnd );
 630                                 $out->addHTML( '<p>' . $paging . '</p>' );
 631                         } else {
 632                                 # No results to show, so don't bother with "showing X of Y" etc.
 633                                 # -- just let the user know and give up now
 634                                 $this->showEmptyText();
 635                                 $out->addHTML( Xml::closeElement( 'div' ) );
 636                                 return;
 637                         }
 638                 }
 639
 640                 # The actual results; specialist subclasses will want to handle this
 641                 # with more than a straight list, so we hand them the info, plus
 642                 # an OutputPage, and let them get on with it
 643                 $this->outputResults( $out,
 644                         $this->getSkin(),
 645                         $dbr, # Should use a ResultWrapper for this
 646                         $res,
 647                         min( $this->numRows, $this->limit ), # do not format the one extra row, if exist
 648                         $this->offset );
 649
 650                 # Repeat the paging links at the bottom
 651                 if ( $this->shownavigation ) {
 652                         $out->addHTML( '<p>' . $paging . '</p>' );
 653                 }
 654
 655                 $out->addHTML( Xml::closeElement( 'div' ) );
 656         }
 657
 658         /**
 659          * Format and output report results using the given information plus
 660          * OutputPage
 661          *
 662          * @param OutputPage $out OutputPage to print to
 663          * @param Skin $skin User skin to use
 664          * @param IDatabase $dbr Database (read) connection to use
 665          * @param ResultWrapper $res Result pointer
 666          * @param int $num Number of available result rows
 667          * @param int $offset Paging offset
 668          */
 669         protected function outputResults( $out, $skin, $dbr, $res, $num, $offset ) {
 670                 global $wgContLang;
 671
 672                 if ( $num > 0 ) {
 673                         $html = [];
 674                         if ( !$this->listoutput ) {
 675                                 $html[] = $this->openList( $offset );
 676                         }
 677
 678                         # $res might contain the whole 1,000 rows, so we read up to
 679                         # $num [should update this to use a Pager]
 680                         // @codingStandardsIgnoreStart Generic.CodeAnalysis.ForLoopWithTestFunctionCall.NotAllowed
 681                         for ( $i = 0; $i < $num && $row = $res->fetchObject(); $i++ ) {
 682                                 // @codingStandardsIgnoreEnd
 683                                 $line = $this->formatResult( $skin, $row );
 684                                 if ( $line ) {
 685                                         $html[] = $this->listoutput
 686                                                 ? $line
 687                                                 : "<li>{$line}</li>\n";
 688                                 }
 689                         }
 690
 691                         # Flush the final result
 692                         if ( $this->tryLastResult() ) {
 693                                 $row = null;
 694                                 $line = $this->formatResult( $skin, $row );
 695                                 if ( $line ) {
 696                                         $html[] = $this->listoutput
 697                                                 ? $line
 698                                                 : "<li>{$line}</li>\n";
 699                                 }
 700                         }
 701
 702                         if ( !$this->listoutput ) {
 703                                 $html[] = $this->closeList();
 704                         }
 705
 706                         $html = $this->listoutput
 707                                 ? $wgContLang->listToText( $html )
 708                                 : implode( '', $html );
 709
 710                         $out->addHTML( $html );
 711                 }
 712         }
 713
 714         /**
 715          * @param int $offset
 716          * @return string
 717          */
 718         function openList( $offset ) {
 719                 return "\n<ol start='" . ( $offset + 1 ) . "' class='special'>\n";
 720         }
 721
 722         /**
 723          * @return string
 724          */
 725         function closeList() {
 726                 return "</ol>\n";
 727         }
 728
 729         /**
 730          * Do any necessary preprocessing of the result object.
 731          * @param IDatabase $db
 732          * @param ResultWrapper $res
 733          */
 734         function preprocessResults( $db, $res ) {
 735         }
 736
 737         /**
 738          * Similar to above, but packaging in a syndicated feed instead of a web page
 739          * @param string $class
 740          * @param int $limit
 741          * @return bool
 742          */
 743         function doFeed( $class = '', $limit = 50 ) {
 744                 if ( !$this->getConfig()->get( 'Feed' ) ) {
 745                         $this->getOutput()->addWikiMsg( 'feed-unavailable' );
 746                         return false;
 747                 }
 748
 749                 $limit = min( $limit, $this->getConfig()->get( 'FeedLimit' ) );
 750
 751                 $feedClasses = $this->getConfig()->get( 'FeedClasses' );
 752                 if ( isset( $feedClasses[$class] ) ) {
 753                         /** @var RSSFeed|AtomFeed $feed */
 754                         $feed = new $feedClasses[$class](
 755                                 $this->feedTitle(),
 756                                 $this->feedDesc(),
 757                                 $this->feedUrl() );
 758                         $feed->outHeader();
 759
 760                         $res = $this->reallyDoQuery( $limit, 0 );
 761                         foreach ( $res as $obj ) {
 762                                 $item = $this->feedResult( $obj );
 763                                 if ( $item ) {
 764                                         $feed->outItem( $item );
 765                                 }
 766                         }
 767
 768                         $feed->outFooter();
 769                         return true;
 770                 } else {
 771                         return false;
 772                 }
 773         }
 774
 775         /**
 776          * Override for custom handling. If the titles/links are ok, just do
 777          * feedItemDesc()
 778          * @param object $row
 779          * @return FeedItem|null
 780          */
 781         function feedResult( $row ) {
 782                 if ( !isset( $row->title ) ) {
 783                         return null;
 784                 }
 785                 $title = Title::makeTitle( intval( $row->namespace ), $row->title );
 786                 if ( $title ) {
 787                         $date = isset( $row->timestamp ) ? $row->timestamp : '';
 788                         $comments = '';
 789                         if ( $title ) {
 790                                 $talkpage = $title->getTalkPage();
 791                                 $comments = $talkpage->getFullURL();
 792                         }
 793
 794                         return new FeedItem(
 795                                 $title->getPrefixedText(),
 796                                 $this->feedItemDesc( $row ),
 797                                 $title->getFullURL(),
 798                                 $date,
 799                                 $this->feedItemAuthor( $row ),
 800                                 $comments );
 801                 } else {
 802                         return null;
 803                 }
 804         }
 805
 806         function feedItemDesc( $row ) {
 807                 return isset( $row->comment ) ? htmlspecialchars( $row->comment ) : '';
 808         }
 809
 810         function feedItemAuthor( $row ) {
 811                 return isset( $row->user_text ) ? $row->user_text : '';
 812         }
 813
 814         function feedTitle() {
 815                 $desc = $this->getDescription();
 816                 $code = $this->getConfig()->get( 'LanguageCode' );
 817                 $sitename = $this->getConfig()->get( 'Sitename' );
 818                 return "$sitename - $desc [$code]";
 819         }
 820
 821         function feedDesc() {
 822                 return $this->msg( 'tagline' )->text();
 823         }
 824
 825         function feedUrl() {
 826                 return $this->getPageTitle()->getFullURL();
 827         }
 828
 829         /**
 830          * Creates a new LinkBatch object, adds all pages from the passed ResultWrapper (MUST include
 831          * title and optional the namespace field) and executes the batch. This operation will pre-cache
 832          * LinkCache information like page existence and information for stub color and redirect hints.
 833          *
 834          * @param ResultWrapper $res The ResultWrapper object to process. Needs to include the title
 835          *  field and namespace field, if the $ns parameter isn't set.
 836          * @param null $ns Use this namespace for the given titles in the ResultWrapper object,
 837          *  instead of the namespace value of $res.
 838          */
 839         protected function executeLBFromResultWrapper( ResultWrapper $res, $ns = null ) {
 840                 if ( !$res->numRows() ) {
 841                         return;
 842                 }
 843
 844                 $batch = new LinkBatch;
 845                 foreach ( $res as $row ) {
 846                         $batch->add( $ns !== null ? $ns : $row->namespace, $row->title );
 847                 }
 848                 $batch->execute();
 849
 850                 $res->seek( 0 );
 851         }
 852 }