includes/specialpage/ChangesListSpecialPage.php

   1 <?php
   2 /**
   3  * Special page which uses a ChangesList to show query results.
   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 use MediaWiki\Logger\LoggerFactory;
  24 use Wikimedia\Rdbms\ResultWrapper;
  25 use Wikimedia\Rdbms\IDatabase;
  26
  27 /**
  28  * Special page which uses a ChangesList to show query results.
  29  * @todo Way too many public functions, most of them should be protected
  30  *
  31  * @ingroup SpecialPage
  32  */
  33 abstract class ChangesListSpecialPage extends SpecialPage {
  34         /** @var string */
  35         protected $rcSubpage;
  36
  37         /** @var FormOptions */
  38         protected $rcOptions;
  39
  40         /** @var array */
  41         protected $customFilters;
  42
  43         // Order of both groups and filters is significant; first is top-most priority,
  44         // descending from there.
  45         // 'showHideSuffix' is a shortcut to and avoid spelling out
  46         // details specific to subclasses here.
  47         /**
  48          * Definition information for the filters and their groups
  49          *
  50          * The value is $groupDefinition, a parameter to the ChangesListFilterGroup constructor.
  51          * However, priority is dynamically added for the core groups, to ease maintenance.
  52          *
  53          * Groups are displayed to the user in the structured UI.  However, if necessary,
  54          * all of the filters in a group can be configured to only display on the
  55          * unstuctured UI, in which case you don't need a group title.  This is done in
  56          * getFilterGroupDefinitionFromLegacyCustomFilters, for example.
  57          *
  58          * @var array $filterGroupDefinitions
  59          */
  60         private $filterGroupDefinitions;
  61
  62         // Same format as filterGroupDefinitions, but for a single group (reviewStatus)
  63         // that is registered conditionally.
  64         private $reviewStatusFilterGroupDefinition;
  65
  66         // Single filter registered conditionally
  67         private $hideCategorizationFilterDefinition;
  68
  69         /**
  70          * Filter groups, and their contained filters
  71          * This is an associative array (with group name as key) of ChangesListFilterGroup objects.
  72          *
  73          * @var array $filterGroups
  74          */
  75         protected $filterGroups = [];
  76
  77         public function __construct( $name, $restriction ) {
  78                 parent::__construct( $name, $restriction );
  79
  80                 $this->filterGroupDefinitions = [
  81                         [
  82                                 'name' => 'registration',
  83                                 'title' => 'rcfilters-filtergroup-registration',
  84                                 'class' => ChangesListBooleanFilterGroup::class,
  85                                 'filters' => [
  86                                         [
  87                                                 'name' => 'hideliu',
  88                                                 'label' => 'rcfilters-filter-registered-label',
  89                                                 'description' => 'rcfilters-filter-registered-description',
  90                                                 // rcshowhideliu-show, rcshowhideliu-hide,
  91                                                 // wlshowhideliu
  92                                                 'showHideSuffix' => 'showhideliu',
  93                                                 'default' => false,
  94                                                 'queryCallable' => function ( $specialClassName, $ctx, $dbr, &$tables, &$fields, &$conds,
  95                                                         &$query_options, &$join_conds ) {
  96
  97                                                         $conds[] = 'rc_user = 0';
  98                                                 },
  99                                                 'cssClassSuffix' => 'liu',
 100                                                 'isRowApplicableCallable' => function ( $ctx, $rc ) {
 101                                                         return $rc->getAttribute( 'rc_user' );
 102                                                 },
 103
 104                                         ],
 105                                         [
 106                                                 'name' => 'hideanons',
 107                                                 'label' => 'rcfilters-filter-unregistered-label',
 108                                                 'description' => 'rcfilters-filter-unregistered-description',
 109                                                 // rcshowhideanons-show, rcshowhideanons-hide,
 110                                                 // wlshowhideanons
 111                                                 'showHideSuffix' => 'showhideanons',
 112                                                 'default' => false,
 113                                                 'queryCallable' => function ( $specialClassName, $ctx, $dbr, &$tables, &$fields, &$conds,
 114                                                         &$query_options, &$join_conds ) {
 115
 116                                                         $conds[] = 'rc_user != 0';
 117                                                 },
 118                                                 'cssClassSuffix' => 'anon',
 119                                                 'isRowApplicableCallable' => function ( $ctx, $rc ) {
 120                                                         return !$rc->getAttribute( 'rc_user' );
 121                                                 },
 122                                         ]
 123                                 ],
 124                         ],
 125
 126                         [
 127                                 'name' => 'userExpLevel',
 128                                 'title' => 'rcfilters-filtergroup-userExpLevel',
 129                                 'class' => ChangesListStringOptionsFilterGroup::class,
 130                                 // Excludes unregistered users
 131                                 'isFullCoverage' => false,
 132                                 'filters' => [
 133                                         [
 134                                                 'name' => 'newcomer',
 135                                                 'label' => 'rcfilters-filter-user-experience-level-newcomer-label',
 136                                                 'description' => 'rcfilters-filter-user-experience-level-newcomer-description',
 137                                                 'cssClassSuffix' => 'user-newcomer',
 138                                                 'isRowApplicableCallable' => function ( $ctx, $rc ) {
 139                                                         $performer = $rc->getPerformer();
 140                                                         return $performer && $performer->isLoggedIn() &&
 141                                                                 $performer->getExperienceLevel() === 'newcomer';
 142                                                 }
 143                                         ],
 144                                         [
 145                                                 'name' => 'learner',
 146                                                 'label' => 'rcfilters-filter-user-experience-level-learner-label',
 147                                                 'description' => 'rcfilters-filter-user-experience-level-learner-description',
 148                                                 'cssClassSuffix' => 'user-learner',
 149                                                 'isRowApplicableCallable' => function ( $ctx, $rc ) {
 150                                                         $performer = $rc->getPerformer();
 151                                                         return $performer && $performer->isLoggedIn() &&
 152                                                                 $performer->getExperienceLevel() === 'learner';
 153                                                 },
 154                                         ],
 155                                         [
 156                                                 'name' => 'experienced',
 157                                                 'label' => 'rcfilters-filter-user-experience-level-experienced-label',
 158                                                 'description' => 'rcfilters-filter-user-experience-level-experienced-description',
 159                                                 'cssClassSuffix' => 'user-experienced',
 160                                                 'isRowApplicableCallable' => function ( $ctx, $rc ) {
 161                                                         $performer = $rc->getPerformer();
 162                                                         return $performer && $performer->isLoggedIn() &&
 163                                                                 $performer->getExperienceLevel() === 'experienced';
 164                                                 },
 165                                         ]
 166                                 ],
 167                                 'default' => ChangesListStringOptionsFilterGroup::NONE,
 168                                 'queryCallable' => [ $this, 'filterOnUserExperienceLevel' ],
 169                         ],
 170
 171                         [
 172                                 'name' => 'authorship',
 173                                 'title' => 'rcfilters-filtergroup-authorship',
 174                                 'class' => ChangesListBooleanFilterGroup::class,
 175                                 'filters' => [
 176                                         [
 177                                                 'name' => 'hidemyself',
 178                                                 'label' => 'rcfilters-filter-editsbyself-label',
 179                                                 'description' => 'rcfilters-filter-editsbyself-description',
 180                                                 // rcshowhidemine-show, rcshowhidemine-hide,
 181                                                 // wlshowhidemine
 182                                                 'showHideSuffix' => 'showhidemine',
 183                                                 'default' => false,
 184                                                 'queryCallable' => function ( $specialClassName, $ctx, $dbr, &$tables, &$fields, &$conds,
 185                                                         &$query_options, &$join_conds ) {
 186
 187                                                         $user = $ctx->getUser();
 188                                                         $conds[] = 'rc_user_text != ' . $dbr->addQuotes( $user->getName() );
 189                                                 },
 190                                                 'cssClassSuffix' => 'self',
 191                                                 'isRowApplicableCallable' => function ( $ctx, $rc ) {
 192                                                         return $ctx->getUser()->equals( $rc->getPerformer() );
 193                                                 },
 194                                         ],
 195                                         [
 196                                                 'name' => 'hidebyothers',
 197                                                 'label' => 'rcfilters-filter-editsbyother-label',
 198                                                 'description' => 'rcfilters-filter-editsbyother-description',
 199                                                 'default' => false,
 200                                                 'queryCallable' => function ( $specialClassName, $ctx, $dbr, &$tables, &$fields, &$conds,
 201                                                         &$query_options, &$join_conds ) {
 202
 203                                                         $user = $ctx->getUser();
 204                                                         $conds[] = 'rc_user_text = ' . $dbr->addQuotes( $user->getName() );
 205                                                 },
 206                                                 'cssClassSuffix' => 'others',
 207                                                 'isRowApplicableCallable' => function ( $ctx, $rc ) {
 208                                                         return !$ctx->getUser()->equals( $rc->getPerformer() );
 209                                                 },
 210                                         ]
 211                                 ]
 212                         ],
 213
 214                         [
 215                                 'name' => 'automated',
 216                                 'title' => 'rcfilters-filtergroup-automated',
 217                                 'class' => ChangesListBooleanFilterGroup::class,
 218                                 'filters' => [
 219                                         [
 220                                                 'name' => 'hidebots',
 221                                                 'label' => 'rcfilters-filter-bots-label',
 222                                                 'description' => 'rcfilters-filter-bots-description',
 223                                                 // rcshowhidebots-show, rcshowhidebots-hide,
 224                                                 // wlshowhidebots
 225                                                 'showHideSuffix' => 'showhidebots',
 226                                                 'default' => false,
 227                                                 'queryCallable' => function ( $specialClassName, $ctx, $dbr, &$tables, &$fields, &$conds,
 228                                                         &$query_options, &$join_conds ) {
 229
 230                                                         $conds[] = 'rc_bot = 0';
 231                                                 },
 232                                                 'cssClassSuffix' => 'bot',
 233                                                 'isRowApplicableCallable' => function ( $ctx, $rc ) {
 234                                                         return $rc->getAttribute( 'rc_bot' );
 235                                                 },
 236                                         ],
 237                                         [
 238                                                 'name' => 'hidehumans',
 239                                                 'label' => 'rcfilters-filter-humans-label',
 240                                                 'description' => 'rcfilters-filter-humans-description',
 241                                                 'default' => false,
 242                                                 'queryCallable' => function ( $specialClassName, $ctx, $dbr, &$tables, &$fields, &$conds,
 243                                                         &$query_options, &$join_conds ) {
 244
 245                                                         $conds[] = 'rc_bot = 1';
 246                                                 },
 247                                                 'cssClassSuffix' => 'human',
 248                                                 'isRowApplicableCallable' => function ( $ctx, $rc ) {
 249                                                         return !$rc->getAttribute( 'rc_bot' );
 250                                                 },
 251                                         ]
 252                                 ]
 253                         ],
 254
 255                         // reviewStatus (conditional)
 256
 257                         [
 258                                 'name' => 'significance',
 259                                 'title' => 'rcfilters-filtergroup-significance',
 260                                 'class' => ChangesListBooleanFilterGroup::class,
 261                                 'priority' => -6,
 262                                 'filters' => [
 263                                         [
 264                                                 'name' => 'hideminor',
 265                                                 'label' => 'rcfilters-filter-minor-label',
 266                                                 'description' => 'rcfilters-filter-minor-description',
 267                                                 // rcshowhideminor-show, rcshowhideminor-hide,
 268                                                 // wlshowhideminor
 269                                                 'showHideSuffix' => 'showhideminor',
 270                                                 'default' => false,
 271                                                 'queryCallable' => function ( $specialClassName, $ctx, $dbr, &$tables, &$fields, &$conds,
 272                                                         &$query_options, &$join_conds ) {
 273
 274                                                         $conds[] = 'rc_minor = 0';
 275                                                 },
 276                                                 'cssClassSuffix' => 'minor',
 277                                                 'isRowApplicableCallable' => function ( $ctx, $rc ) {
 278                                                         return $rc->getAttribute( 'rc_minor' );
 279                                                 }
 280                                         ],
 281                                         [
 282                                                 'name' => 'hidemajor',
 283                                                 'label' => 'rcfilters-filter-major-label',
 284                                                 'description' => 'rcfilters-filter-major-description',
 285                                                 'default' => false,
 286                                                 'queryCallable' => function ( $specialClassName, $ctx, $dbr, &$tables, &$fields, &$conds,
 287                                                         &$query_options, &$join_conds ) {
 288
 289                                                         $conds[] = 'rc_minor = 1';
 290                                                 },
 291                                                 'cssClassSuffix' => 'major',
 292                                                 'isRowApplicableCallable' => function ( $ctx, $rc ) {
 293                                                         return !$rc->getAttribute( 'rc_minor' );
 294                                                 }
 295                                         ]
 296                                 ]
 297                         ],
 298
 299                         [
 300                                 'name' => 'lastRevision',
 301                                 'title' => 'rcfilters-filtergroup-lastRevision',
 302                                 'class' => ChangesListBooleanFilterGroup::class,
 303                                 'priority' => -7,
 304                                 'filters' => [
 305                                         [
 306                                                 'name' => 'hidelastrevision',
 307                                                 'label' => 'rcfilters-filter-lastrevision-label',
 308                                                 'description' => 'rcfilters-filter-lastrevision-description',
 309                                                 'default' => false,
 310                                                 'queryCallable' => function ( $specialClassName, $ctx, $dbr, &$tables, &$fields, &$conds,
 311                                                         &$query_options, &$join_conds ) {
 312                                                         $conds[] = 'rc_this_oldid <> page_latest';
 313                                                 },
 314                                                 'cssClassSuffix' => 'last',
 315                                                 'isRowApplicableCallable' => function ( $ctx, $rc ) {
 316                                                         return $rc->getAttribute( 'rc_this_oldid' ) === $rc->getAttribute( 'page_latest' );
 317                                                 }
 318                                         ],
 319                                         [
 320                                                 'name' => 'hidepreviousrevisions',
 321                                                 'label' => 'rcfilters-filter-previousrevision-label',
 322                                                 'description' => 'rcfilters-filter-previousrevision-description',
 323                                                 'default' => false,
 324                                                 'queryCallable' => function ( $specialClassName, $ctx, $dbr, &$tables, &$fields, &$conds,
 325                                                         &$query_options, &$join_conds ) {
 326                                                         $conds[] = 'rc_this_oldid = page_latest';
 327                                                 },
 328                                                 'cssClassSuffix' => 'previous',
 329                                                 'isRowApplicableCallable' => function ( $ctx, $rc ) {
 330                                                         return $rc->getAttribute( 'rc_this_oldid' ) !== $rc->getAttribute( 'page_latest' );
 331                                                 }
 332                                         ]
 333                                 ]
 334                         ],
 335
 336                         // With extensions, there can be change types that will not be hidden by any of these.
 337                         [
 338                                 'name' => 'changeType',
 339                                 'title' => 'rcfilters-filtergroup-changetype',
 340                                 'class' => ChangesListBooleanFilterGroup::class,
 341                                 'priority' => -8,
 342                                 'filters' => [
 343                                         [
 344                                                 'name' => 'hidepageedits',
 345                                                 'label' => 'rcfilters-filter-pageedits-label',
 346                                                 'description' => 'rcfilters-filter-pageedits-description',
 347                                                 'default' => false,
 348                                                 'priority' => -2,
 349                                                 'queryCallable' => function ( $specialClassName, $ctx, $dbr, &$tables, &$fields, &$conds,
 350                                                         &$query_options, &$join_conds ) {
 351
 352                                                         $conds[] = 'rc_type != ' . $dbr->addQuotes( RC_EDIT );
 353                                                 },
 354                                                 'cssClassSuffix' => 'src-mw-edit',
 355                                                 'isRowApplicableCallable' => function ( $ctx, $rc ) {
 356                                                         return $rc->getAttribute( 'rc_source' ) === RecentChange::SRC_EDIT;
 357                                                 },
 358                                         ],
 359                                         [
 360                                                 'name' => 'hidenewpages',
 361                                                 'label' => 'rcfilters-filter-newpages-label',
 362                                                 'description' => 'rcfilters-filter-newpages-description',
 363                                                 'default' => false,
 364                                                 'priority' => -3,
 365                                                 'queryCallable' => function ( $specialClassName, $ctx, $dbr, &$tables, &$fields, &$conds,
 366                                                         &$query_options, &$join_conds ) {
 367
 368                                                         $conds[] = 'rc_type != ' . $dbr->addQuotes( RC_NEW );
 369                                                 },
 370                                                 'cssClassSuffix' => 'src-mw-new',
 371                                                 'isRowApplicableCallable' => function ( $ctx, $rc ) {
 372                                                         return $rc->getAttribute( 'rc_source' ) === RecentChange::SRC_NEW;
 373                                                 },
 374                                         ],
 375
 376                                         // hidecategorization
 377
 378                                         [
 379                                                 'name' => 'hidelog',
 380                                                 'label' => 'rcfilters-filter-logactions-label',
 381                                                 'description' => 'rcfilters-filter-logactions-description',
 382                                                 'default' => false,
 383                                                 'priority' => -5,
 384                                                 'queryCallable' => function ( $specialClassName, $ctx, $dbr, &$tables, &$fields, &$conds,
 385                                                         &$query_options, &$join_conds ) {
 386
 387                                                         $conds[] = 'rc_type != ' . $dbr->addQuotes( RC_LOG );
 388                                                 },
 389                                                 'cssClassSuffix' => 'src-mw-log',
 390                                                 'isRowApplicableCallable' => function ( $ctx, $rc ) {
 391                                                         return $rc->getAttribute( 'rc_source' ) === RecentChange::SRC_LOG;
 392                                                 }
 393                                         ],
 394                                 ],
 395                         ],
 396
 397                 ];
 398
 399                 $this->reviewStatusFilterGroupDefinition = [
 400                         [
 401                                 'name' => 'reviewStatus',
 402                                 'title' => 'rcfilters-filtergroup-reviewstatus',
 403                                 'class' => ChangesListBooleanFilterGroup::class,
 404                                 'priority' => -5,
 405                                 'filters' => [
 406                                         [
 407                                                 'name' => 'hidepatrolled',
 408                                                 'label' => 'rcfilters-filter-patrolled-label',
 409                                                 'description' => 'rcfilters-filter-patrolled-description',
 410                                                 // rcshowhidepatr-show, rcshowhidepatr-hide
 411                                                 // wlshowhidepatr
 412                                                 'showHideSuffix' => 'showhidepatr',
 413                                                 'default' => false,
 414                                                 'queryCallable' => function ( $specialClassName, $ctx, $dbr, &$tables, &$fields, &$conds,
 415                                                         &$query_options, &$join_conds ) {
 416
 417                                                         $conds[] = 'rc_patrolled = 0';
 418                                                 },
 419                                                 'cssClassSuffix' => 'patrolled',
 420                                                 'isRowApplicableCallable' => function ( $ctx, $rc ) {
 421                                                         return $rc->getAttribute( 'rc_patrolled' );
 422                                                 },
 423                                         ],
 424                                         [
 425                                                 'name' => 'hideunpatrolled',
 426                                                 'label' => 'rcfilters-filter-unpatrolled-label',
 427                                                 'description' => 'rcfilters-filter-unpatrolled-description',
 428                                                 'default' => false,
 429                                                 'queryCallable' => function ( $specialClassName, $ctx, $dbr, &$tables, &$fields, &$conds,
 430                                                         &$query_options, &$join_conds ) {
 431
 432                                                         $conds[] = 'rc_patrolled = 1';
 433                                                 },
 434                                                 'cssClassSuffix' => 'unpatrolled',
 435                                                 'isRowApplicableCallable' => function ( $ctx, $rc ) {
 436                                                         return !$rc->getAttribute( 'rc_patrolled' );
 437                                                 },
 438                                         ],
 439                                 ],
 440                         ]
 441                 ];
 442
 443                 $this->hideCategorizationFilterDefinition = [
 444                         'name' => 'hidecategorization',
 445                         'label' => 'rcfilters-filter-categorization-label',
 446                         'description' => 'rcfilters-filter-categorization-description',
 447                         // rcshowhidecategorization-show, rcshowhidecategorization-hide.
 448                         // wlshowhidecategorization
 449                         'showHideSuffix' => 'showhidecategorization',
 450                         'default' => false,
 451                         'priority' => -4,
 452                         'queryCallable' => function ( $specialClassName, $ctx, $dbr, &$tables, &$fields, &$conds,
 453                                 &$query_options, &$join_conds ) {
 454
 455                                 $conds[] = 'rc_type != ' . $dbr->addQuotes( RC_CATEGORIZE );
 456                         },
 457                         'cssClassSuffix' => 'src-mw-categorize',
 458                         'isRowApplicableCallable' => function ( $ctx, $rc ) {
 459                                 return $rc->getAttribute( 'rc_source' ) === RecentChange::SRC_CATEGORIZE;
 460                         },
 461                 ];
 462         }
 463
 464         /**
 465          * Check if filters are in conflict and guaranteed to return no results.
 466          *
 467          * @return bool
 468          */
 469         protected function areFiltersInConflict() {
 470                 $opts = $this->getOptions();
 471                 /** @var ChangesListFilterGroup $group */
 472                 foreach ( $this->getFilterGroups() as $group ) {
 473
 474                         if ( $group->getConflictingGroups() ) {
 475                                 wfLogWarning(
 476                                         $group->getName() .
 477                                         " specifies conflicts with other groups but these are not supported yet."
 478                                 );
 479                         }
 480
 481                         /** @var ChangesListFilter $conflictingFilter */
 482                         foreach ( $group->getConflictingFilters() as $conflictingFilter ) {
 483                                 if ( $conflictingFilter->activelyInConflictWithGroup( $group, $opts ) ) {
 484                                         return true;
 485                                 }
 486                         }
 487
 488                         /** @var ChangesListFilter $filter */
 489                         foreach ( $group->getFilters() as $filter ) {
 490
 491                                 /** @var ChangesListFilter $conflictingFilter */
 492                                 foreach ( $filter->getConflictingFilters() as $conflictingFilter ) {
 493                                         if (
 494                                                 $conflictingFilter->activelyInConflictWithFilter( $filter, $opts ) &&
 495                                                 $filter->activelyInConflictWithFilter( $conflictingFilter, $opts )
 496                                         ) {
 497                                                 return true;
 498                                         }
 499                                 }
 500
 501                         }
 502
 503                 }
 504
 505                 return false;
 506         }
 507
 508         /**
 509          * Main execution point
 510          *
 511          * @param string $subpage
 512          */
 513         public function execute( $subpage ) {
 514                 $this->rcSubpage = $subpage;
 515
 516                 $this->setHeaders();
 517                 $this->outputHeader();
 518                 $this->addModules();
 519
 520                 $rows = $this->getRows();
 521                 $opts = $this->getOptions();
 522                 if ( $rows === false ) {
 523                         if ( !$this->including() ) {
 524                                 $this->doHeader( $opts, 0 );
 525                                 $this->outputNoResults();
 526                                 $this->getOutput()->setStatusCode( 404 );
 527                         }
 528
 529                         return;
 530                 }
 531
 532                 $batch = new LinkBatch;
 533                 foreach ( $rows as $row ) {
 534                         $batch->add( NS_USER, $row->rc_user_text );
 535                         $batch->add( NS_USER_TALK, $row->rc_user_text );
 536                         $batch->add( $row->rc_namespace, $row->rc_title );
 537                         if ( $row->rc_source === RecentChange::SRC_LOG ) {
 538                                 $formatter = LogFormatter::newFromRow( $row );
 539                                 foreach ( $formatter->getPreloadTitles() as $title ) {
 540                                         $batch->addObj( $title );
 541                                 }
 542                         }
 543                 }
 544                 $batch->execute();
 545                 $this->webOutput( $rows, $opts );
 546
 547                 $rows->free();
 548
 549                 if ( $this->getConfig()->get( 'EnableWANCacheReaper' ) ) {
 550                         // Clean up any bad page entries for titles showing up in RC
 551                         DeferredUpdates::addUpdate( new WANCacheReapUpdate(
 552                                 $this->getDB(),
 553                                 LoggerFactory::getInstance( 'objectcache' )
 554                         ) );
 555                 }
 556         }
 557
 558         /**
 559          * Add the "no results" message to the output
 560          */
 561         protected function outputNoResults() {
 562                 $this->getOutput()->addHTML(
 563                         '<div class="mw-changeslist-empty">' .
 564                         $this->msg( 'recentchanges-noresult' )->parse() .
 565                         '</div>'
 566                 );
 567         }
 568
 569         /**
 570          * Get the database result for this special page instance. Used by ApiFeedRecentChanges.
 571          *
 572          * @return bool|ResultWrapper Result or false
 573          */
 574         public function getRows() {
 575                 $opts = $this->getOptions();
 576
 577                 $tables = [];
 578                 $fields = [];
 579                 $conds = [];
 580                 $query_options = [];
 581                 $join_conds = [];
 582                 $this->buildQuery( $tables, $fields, $conds, $query_options, $join_conds, $opts );
 583
 584                 return $this->doMainQuery( $tables, $fields, $conds, $query_options, $join_conds, $opts );
 585         }
 586
 587         /**
 588          * Get the current FormOptions for this request
 589          *
 590          * @return FormOptions
 591          */
 592         public function getOptions() {
 593                 if ( $this->rcOptions === null ) {
 594                         $this->rcOptions = $this->setup( $this->rcSubpage );
 595                 }
 596
 597                 return $this->rcOptions;
 598         }
 599
 600         /**
 601          * Register all filters and their groups (including those from hooks), plus handle
 602          * conflicts and defaults.
 603          *
 604          * You might want to customize these in the same method, in subclasses.  You can
 605          * call getFilterGroup to access a group, and (on the group) getFilter to access a
 606          * filter, then make necessary modfications to the filter or group (e.g. with
 607          * setDefault).
 608          */
 609         protected function registerFilters() {
 610                 $this->registerFiltersFromDefinitions( $this->filterGroupDefinitions );
 611
 612                 // Make sure this is not being transcluded (we don't want to show this
 613                 // information to all users just because the user that saves the edit can
 614                 // patrol or is logged in)
 615                 if ( !$this->including() && $this->getUser()->useRCPatrol() ) {
 616                         $this->registerFiltersFromDefinitions( $this->reviewStatusFilterGroupDefinition );
 617                 }
 618
 619                 $changeTypeGroup = $this->getFilterGroup( 'changeType' );
 620
 621                 if ( $this->getConfig()->get( 'RCWatchCategoryMembership' ) ) {
 622                         $transformedHideCategorizationDef = $this->transformFilterDefinition(
 623                                 $this->hideCategorizationFilterDefinition
 624                         );
 625
 626                         $transformedHideCategorizationDef['group'] = $changeTypeGroup;
 627
 628                         $hideCategorization = new ChangesListBooleanFilter(
 629                                 $transformedHideCategorizationDef
 630                         );
 631                 }
 632
 633                 Hooks::run( 'ChangesListSpecialPageStructuredFilters', [ $this ] );
 634
 635                 $unstructuredGroupDefinition =
 636                         $this->getFilterGroupDefinitionFromLegacyCustomFilters(
 637                                 $this->getCustomFilters()
 638                         );
 639                 $this->registerFiltersFromDefinitions( [ $unstructuredGroupDefinition ] );
 640
 641                 $userExperienceLevel = $this->getFilterGroup( 'userExpLevel' );
 642
 643                 $registration = $this->getFilterGroup( 'registration' );
 644                 $anons = $registration->getFilter( 'hideanons' );
 645
 646                 // This means there is a conflict between any item in user experience level
 647                 // being checked and only anons being *shown* (hideliu=1&hideanons=0 in the
 648                 // URL, or equivalent).
 649                 $userExperienceLevel->conflictsWith(
 650                         $anons,
 651                         'rcfilters-filtergroup-user-experience-level-conflicts-unregistered-global',
 652                         'rcfilters-filtergroup-user-experience-level-conflicts-unregistered',
 653                         'rcfilters-filter-unregistered-conflicts-user-experience-level'
 654                 );
 655
 656                 $categoryFilter = $changeTypeGroup->getFilter( 'hidecategorization' );
 657                 $logactionsFilter = $changeTypeGroup->getFilter( 'hidelog' );
 658                 $pagecreationFilter = $changeTypeGroup->getFilter( 'hidenewpages' );
 659
 660                 $significanceTypeGroup = $this->getFilterGroup( 'significance' );
 661                 $hideMinorFilter = $significanceTypeGroup->getFilter( 'hideminor' );
 662
 663                 // categoryFilter is conditional; see registerFilters
 664                 if ( $categoryFilter !== null ) {
 665                         $hideMinorFilter->conflictsWith(
 666                                 $categoryFilter,
 667                                 'rcfilters-hideminor-conflicts-typeofchange-global',
 668                                 'rcfilters-hideminor-conflicts-typeofchange',
 669                                 'rcfilters-typeofchange-conflicts-hideminor'
 670                         );
 671                 }
 672                 $hideMinorFilter->conflictsWith(
 673                         $logactionsFilter,
 674                         'rcfilters-hideminor-conflicts-typeofchange-global',
 675                         'rcfilters-hideminor-conflicts-typeofchange',
 676                         'rcfilters-typeofchange-conflicts-hideminor'
 677                 );
 678                 $hideMinorFilter->conflictsWith(
 679                         $pagecreationFilter,
 680                         'rcfilters-hideminor-conflicts-typeofchange-global',
 681                         'rcfilters-hideminor-conflicts-typeofchange',
 682                         'rcfilters-typeofchange-conflicts-hideminor'
 683                 );
 684         }
 685
 686         /**
 687          * Transforms filter definition to prepare it for constructor.
 688          *
 689          * See overrides of this method as well.
 690          *
 691          * @param array $filterDefinition Original filter definition
 692          *
 693          * @return array Transformed definition
 694          */
 695         protected function transformFilterDefinition( array $filterDefinition ) {
 696                 return $filterDefinition;
 697         }
 698
 699         /**
 700          * Register filters from a definition object
 701          *
 702          * Array specifying groups and their filters; see Filter and
 703          * ChangesListFilterGroup constructors.
 704          *
 705          * There is light processing to simplify core maintenance.
 706          */
 707         protected function registerFiltersFromDefinitions( array $definition ) {
 708                 $autoFillPriority = -1;
 709                 foreach ( $definition as $groupDefinition ) {
 710                         if ( !isset( $groupDefinition['priority'] ) ) {
 711                                 $groupDefinition['priority'] = $autoFillPriority;
 712                         } else {
 713                                 // If it's explicitly specified, start over the auto-fill
 714                                 $autoFillPriority = $groupDefinition['priority'];
 715                         }
 716
 717                         $autoFillPriority--;
 718
 719                         $className = $groupDefinition['class'];
 720                         unset( $groupDefinition['class'] );
 721
 722                         foreach ( $groupDefinition['filters'] as &$filterDefinition ) {
 723                                 $filterDefinition = $this->transformFilterDefinition( $filterDefinition );
 724                         }
 725
 726                         $this->registerFilterGroup( new $className( $groupDefinition ) );
 727                 }
 728         }
 729
 730         /**
 731          * Get filter group definition from legacy custom filters
 732          *
 733          * @param array $customFilters Custom filters from legacy hooks
 734          * @return array Group definition
 735          */
 736         protected function getFilterGroupDefinitionFromLegacyCustomFilters( array $customFilters ) {
 737                 // Special internal unstructured group
 738                 $unstructuredGroupDefinition = [
 739                         'name' => 'unstructured',
 740                         'class' => ChangesListBooleanFilterGroup::class,
 741                         'priority' => -1, // Won't display in structured
 742                         'filters' => [],
 743                 ];
 744
 745                 foreach ( $customFilters as $name => $params ) {
 746                         $unstructuredGroupDefinition['filters'][] = [
 747                                 'name' => $name,
 748                                 'showHide' => $params['msg'],
 749                                 'default' => $params['default'],
 750                         ];
 751                 }
 752
 753                 return $unstructuredGroupDefinition;
 754         }
 755
 756         /**
 757          * Register all the filters, including legacy hook-driven ones.
 758          * Then create a FormOptions object with options as specified by the user
 759          *
 760          * @param array $parameters
 761          *
 762          * @return FormOptions
 763          */
 764         public function setup( $parameters ) {
 765                 $this->registerFilters();
 766
 767                 $opts = $this->getDefaultOptions();
 768
 769                 $opts = $this->fetchOptionsFromRequest( $opts );
 770
 771                 // Give precedence to subpage syntax
 772                 if ( $parameters !== null ) {
 773                         $this->parseParameters( $parameters, $opts );
 774                 }
 775
 776                 $this->validateOptions( $opts );
 777
 778                 return $opts;
 779         }
 780
 781         /**
 782          * Get a FormOptions object containing the default options. By default, returns
 783          * some basic options.  The filters listed explicitly here are overriden in this
 784          * method, in subclasses, but most filters (e.g. hideminor, userExpLevel filters,
 785          * and more) are structured.  Structured filters are overriden in registerFilters.
 786          * not here.
 787          *
 788          * @return FormOptions
 789          */
 790         public function getDefaultOptions() {
 791                 $config = $this->getConfig();
 792                 $opts = new FormOptions();
 793                 $structuredUI = $this->getUser()->getOption( 'rcenhancedfilters' );
 794
 795                 // Add all filters
 796                 foreach ( $this->filterGroups as $filterGroup ) {
 797                         // URL parameters can be per-group, like 'userExpLevel',
 798                         // or per-filter, like 'hideminor'.
 799                         if ( $filterGroup->isPerGroupRequestParameter() ) {
 800                                 $opts->add( $filterGroup->getName(), $filterGroup->getDefault() );
 801                         } else {
 802                                 foreach ( $filterGroup->getFilters() as $filter ) {
 803                                         $opts->add( $filter->getName(), $filter->getDefault( $structuredUI ) );
 804                                 }
 805                         }
 806                 }
 807
 808                 $opts->add( 'namespace', '', FormOptions::STRING );
 809                 $opts->add( 'invert', false );
 810                 $opts->add( 'associated', false );
 811
 812                 return $opts;
 813         }
 814
 815         /**
 816          * Register a structured changes list filter group
 817          *
 818          * @param ChangesListFilterGroup $group
 819          */
 820         public function registerFilterGroup( ChangesListFilterGroup $group ) {
 821                 $groupName = $group->getName();
 822
 823                 $this->filterGroups[$groupName] = $group;
 824         }
 825
 826         /**
 827          * Gets the currently registered filters groups
 828          *
 829          * @return array Associative array of ChangesListFilterGroup objects, with group name as key
 830          */
 831         protected function getFilterGroups() {
 832                 return $this->filterGroups;
 833         }
 834
 835         /**
 836          * Gets a specified ChangesListFilterGroup by name
 837          *
 838          * @param string $groupName Name of group
 839          *
 840          * @return ChangesListFilterGroup|null Group, or null if not registered
 841          */
 842         public function getFilterGroup( $groupName ) {
 843                 return isset( $this->filterGroups[$groupName] ) ?
 844                         $this->filterGroups[$groupName] :
 845                         null;
 846         }
 847
 848         // Currently, this intentionally only includes filters that display
 849         // in the structured UI.  This can be changed easily, though, if we want
 850         // to include data on filters that use the unstructured UI.  messageKeys is a
 851         // special top-level value, with the value being an array of the message keys to
 852         // send to the client.
 853         /**
 854          * Gets structured filter information needed by JS
 855          *
 856          * @return array Associative array
 857          * * array $return['groups'] Group data
 858          * * array $return['messageKeys'] Array of message keys
 859          */
 860         public function getStructuredFilterJsData() {
 861                 $output = [
 862                         'groups' => [],
 863                         'messageKeys' => [],
 864                 ];
 865
 866                 $context = $this->getContext();
 867
 868                 usort( $this->filterGroups, function ( $a, $b ) {
 869                         return $b->getPriority() - $a->getPriority();
 870                 } );
 871
 872                 foreach ( $this->filterGroups as $groupName => $group ) {
 873                         $groupOutput = $group->getJsData( $this );
 874                         if ( $groupOutput !== null ) {
 875                                 $output['messageKeys'] = array_merge(
 876                                         $output['messageKeys'],
 877                                         $groupOutput['messageKeys']
 878                                 );
 879
 880                                 unset( $groupOutput['messageKeys'] );
 881                                 $output['groups'][] = $groupOutput;
 882                         }
 883                 }
 884
 885                 return $output;
 886         }
 887
 888         /**
 889          * Get custom show/hide filters using deprecated ChangesListSpecialPageFilters
 890          * hook.
 891          *
 892          * @return array Map of filter URL param names to properties (msg/default)
 893          */
 894         protected function getCustomFilters() {
 895                 if ( $this->customFilters === null ) {
 896                         $this->customFilters = [];
 897                         Hooks::run( 'ChangesListSpecialPageFilters', [ $this, &$this->customFilters ], '1.29' );
 898                 }
 899
 900                 return $this->customFilters;
 901         }
 902
 903         /**
 904          * Fetch values for a FormOptions object from the WebRequest associated with this instance.
 905          *
 906          * Intended for subclassing, e.g. to add a backwards-compatibility layer.
 907          *
 908          * @param FormOptions $opts
 909          * @return FormOptions
 910          */
 911         protected function fetchOptionsFromRequest( $opts ) {
 912                 $opts->fetchValuesFromRequest( $this->getRequest() );
 913
 914                 return $opts;
 915         }
 916
 917         /**
 918          * Process $par and put options found in $opts. Used when including the page.
 919          *
 920          * @param string $par
 921          * @param FormOptions $opts
 922          */
 923         public function parseParameters( $par, FormOptions $opts ) {
 924                 $stringParameterNameSet = [];
 925                 $hideParameterNameSet = [];
 926
 927                 // URL parameters can be per-group, like 'userExpLevel',
 928                 // or per-filter, like 'hideminor'.
 929
 930                 foreach ( $this->filterGroups as $filterGroup ) {
 931                         if ( $filterGroup->isPerGroupRequestParameter() ) {
 932                                 $stringParameterNameSet[$filterGroup->getName()] = true;
 933                         } elseif ( $filterGroup->getType() === ChangesListBooleanFilterGroup::TYPE ) {
 934                                 foreach ( $filterGroup->getFilters() as $filter ) {
 935                                         $hideParameterNameSet[$filter->getName()] = true;
 936                                 }
 937                         }
 938                 }
 939
 940                 $bits = preg_split( '/\s*,\s*/', trim( $par ) );
 941                 foreach ( $bits as $bit ) {
 942                         $m = [];
 943                         if ( isset( $hideParameterNameSet[$bit] ) ) {
 944                                 // hidefoo => hidefoo=true
 945                                 $opts[$bit] = true;
 946                         } elseif ( isset( $hideParameterNameSet["hide$bit"] ) ) {
 947                                 // foo => hidefoo=false
 948                                 $opts["hide$bit"] = false;
 949                         } elseif ( preg_match( '/^(.*)=(.*)$/', $bit, $m ) ) {
 950                                 if ( isset( $stringParameterNameSet[$m[1]] ) ) {
 951                                         $opts[$m[1]] = $m[2];
 952                                 }
 953                         }
 954                 }
 955         }
 956
 957         /**
 958          * Validate a FormOptions object generated by getDefaultOptions() with values already populated.
 959          *
 960          * @param FormOptions $opts
 961          */
 962         public function validateOptions( FormOptions $opts ) {
 963                 if ( $this->fixContradictoryOptions( $opts ) ) {
 964                         $query = wfArrayToCgi( $this->convertParamsForLink( $opts->getChangedValues() ) );
 965                         $this->getOutput()->redirect( $this->getPageTitle()->getCanonicalURL( $query ) );
 966                 }
 967         }
 968
 969         /**
 970          * Fix invalid options by resetting pairs that should never appear together.
 971          *
 972          * @param FormOptions $opts
 973          * @return bool True if any option was reset
 974          */
 975         private function fixContradictoryOptions( FormOptions $opts ) {
 976                 $contradictorySets = [];
 977
 978                 $fixed = $this->fixBackwardsCompatibilityOptions( $opts );
 979
 980                 foreach ( $this->filterGroups as $filterGroup ) {
 981                         if ( $filterGroup instanceof ChangesListBooleanFilterGroup ) {
 982                                 $filters = $filterGroup->getFilters();
 983                                 $allInGroupEnabled = array_reduce(
 984                                         $filters,
 985                                         function ( $carry, $filter ) use ( $opts ) {
 986                                                 return $carry && $opts[ $filter->getName() ];
 987                                         },
 988                                         /* initialValue */ count( $filters ) > 0
 989                                 );
 990
 991                                 if ( $allInGroupEnabled ) {
 992                                         foreach ( $filters as $filter ) {
 993                                                 $opts->reset( $filter->getName() );
 994                                         }
 995
 996                                         $fixed = true;
 997                                 }
 998                         }
 999                 }
1000
1001                 return $fixed;
1002         }
1003
1004         /**
1005          * Fix a special case (hideanons=1 and hideliu=1) in a special way, for backwards
1006          * compatibility.
1007          *
1008          * This is deprecated and may be removed.
1009          *
1010          * @param FormOptions $opts
1011          * @return bool True if this change was mode
1012          */
1013         private function fixBackwardsCompatibilityOptions( FormOptions $opts ) {
1014                 if ( $opts['hideanons'] && $opts['hideliu'] ) {
1015                         $opts->reset( 'hideanons' );
1016                         if ( !$opts['hidebots'] ) {
1017                                 $opts->reset( 'hideliu' );
1018                                 $opts['hidehumans'] = 1;
1019                         }
1020
1021                         return true;
1022                 }
1023
1024                 return false;
1025
1026         }
1027
1028         /**
1029          * Convert parameters values from true/false to 1/0
1030          * so they are not omitted by wfArrayToCgi()
1031          * Bug 36524
1032          *
1033          * @param array $params
1034          * @return array
1035          */
1036         protected function convertParamsForLink( $params ) {
1037                 foreach ( $params as &$value ) {
1038                         if ( $value === false ) {
1039                                 $value = '0';
1040                         }
1041                 }
1042                 unset( $value );
1043                 return $params;
1044         }
1045
1046         /**
1047          * Sets appropriate tables, fields, conditions, etc. depending on which filters
1048          * the user requested.
1049          *
1050          * @param array &$tables Array of tables; see IDatabase::select $table
1051          * @param array &$fields Array of fields; see IDatabase::select $vars
1052          * @param array &$conds Array of conditions; see IDatabase::select $conds
1053          * @param array &$query_options Array of query options; see IDatabase::select $options
1054          * @param array &$join_conds Array of join conditions; see IDatabase::select $join_conds
1055          * @param FormOptions $opts
1056          */
1057         protected function buildQuery( &$tables, &$fields, &$conds, &$query_options,
1058                 &$join_conds, FormOptions $opts ) {
1059
1060                 $dbr = $this->getDB();
1061                 $user = $this->getUser();
1062
1063                 $context = $this->getContext();
1064                 foreach ( $this->filterGroups as $filterGroup ) {
1065                         // URL parameters can be per-group, like 'userExpLevel',
1066                         // or per-filter, like 'hideminor'.
1067                         if ( $filterGroup->isPerGroupRequestParameter() ) {
1068                                 $filterGroup->modifyQuery( $dbr, $this, $tables, $fields, $conds,
1069                                         $query_options, $join_conds, $opts[$filterGroup->getName()] );
1070                         } else {
1071                                 foreach ( $filterGroup->getFilters() as $filter ) {
1072                                         if ( $opts[$filter->getName()] ) {
1073                                                 $filter->modifyQuery( $dbr, $this, $tables, $fields, $conds,
1074                                                         $query_options, $join_conds );
1075                                         }
1076                                 }
1077                         }
1078                 }
1079
1080                 // Namespace filtering
1081                 if ( $opts[ 'namespace' ] !== '' ) {
1082                         $namespaces = explode( ',', $opts[ 'namespace' ] );
1083
1084                         if ( $opts[ 'associated' ] ) {
1085                                 $associatedNamespaces = array_map(
1086                                         function ( $ns ) {
1087                                                 return MWNamespace::getAssociated( $ns );
1088                                         },
1089                                         $namespaces
1090                                 );
1091                                 $namespaces = array_unique( array_merge( $namespaces, $associatedNamespaces ) );
1092                         }
1093
1094                         if ( count( $namespaces ) === 1 ) {
1095                                 $operator = $opts[ 'invert' ] ? '!=' : '=';
1096                                 $value = $dbr->addQuotes( reset( $namespaces ) );
1097                         } else {
1098                                 $operator = $opts[ 'invert' ] ? 'NOT IN' : 'IN';
1099                                 sort( $namespaces );
1100                                 $value = '(' . $dbr->makeList( $namespaces ) . ')';
1101                         }
1102                         $conds[] = "rc_namespace $operator $value";
1103                 }
1104         }
1105
1106         /**
1107          * Process the query
1108          *
1109          * @param array $tables Array of tables; see IDatabase::select $table
1110          * @param array $fields Array of fields; see IDatabase::select $vars
1111          * @param array $conds Array of conditions; see IDatabase::select $conds
1112          * @param array $query_options Array of query options; see IDatabase::select $options
1113          * @param array $join_conds Array of join conditions; see IDatabase::select $join_conds
1114          * @param FormOptions $opts
1115          * @return bool|ResultWrapper Result or false
1116          */
1117         protected function doMainQuery( $tables, $fields, $conds,
1118                 $query_options, $join_conds, FormOptions $opts ) {
1119
1120                 $tables[] = 'recentchanges';
1121                 $fields = array_merge( RecentChange::selectFields(), $fields );
1122
1123                 ChangeTags::modifyDisplayQuery(
1124                         $tables,
1125                         $fields,
1126                         $conds,
1127                         $join_conds,
1128                         $query_options,
1129                         ''
1130                 );
1131
1132                 if ( !$this->runMainQueryHook( $tables, $fields, $conds, $query_options, $join_conds,
1133                         $opts )
1134                 ) {
1135                         return false;
1136                 }
1137
1138                 $dbr = $this->getDB();
1139
1140                 return $dbr->select(
1141                         $tables,
1142                         $fields,
1143                         $conds,
1144                         __METHOD__,
1145                         $query_options,
1146                         $join_conds
1147                 );
1148         }
1149
1150         protected function runMainQueryHook( &$tables, &$fields, &$conds,
1151                 &$query_options, &$join_conds, $opts
1152         ) {
1153                 return Hooks::run(
1154                         'ChangesListSpecialPageQuery',
1155                         [ $this->getName(), &$tables, &$fields, &$conds, &$query_options, &$join_conds, $opts ]
1156                 );
1157         }
1158
1159         /**
1160          * Return a IDatabase object for reading
1161          *
1162          * @return IDatabase
1163          */
1164         protected function getDB() {
1165                 return wfGetDB( DB_REPLICA );
1166         }
1167
1168         /**
1169          * Send output to the OutputPage object, only called if not used feeds
1170          *
1171          * @param ResultWrapper $rows Database rows
1172          * @param FormOptions $opts
1173          */
1174         public function webOutput( $rows, $opts ) {
1175                 if ( !$this->including() ) {
1176                         $this->outputFeedLinks();
1177                         $this->doHeader( $opts, $rows->numRows() );
1178                 }
1179
1180                 $this->outputChangesList( $rows, $opts );
1181         }
1182
1183         /**
1184          * Output feed links.
1185          */
1186         public function outputFeedLinks() {
1187                 // nothing by default
1188         }
1189
1190         /**
1191          * Build and output the actual changes list.
1192          *
1193          * @param ResultWrapper $rows Database rows
1194          * @param FormOptions $opts
1195          */
1196         abstract public function outputChangesList( $rows, $opts );
1197
1198         /**
1199          * Set the text to be displayed above the changes
1200          *
1201          * @param FormOptions $opts
1202          * @param int $numRows Number of rows in the result to show after this header
1203          */
1204         public function doHeader( $opts, $numRows ) {
1205                 $this->setTopText( $opts );
1206
1207                 // @todo Lots of stuff should be done here.
1208
1209                 $this->setBottomText( $opts );
1210         }
1211
1212         /**
1213          * Send the text to be displayed before the options. Should use $this->getOutput()->addWikiText()
1214          * or similar methods to print the text.
1215          *
1216          * @param FormOptions $opts
1217          */
1218         public function setTopText( FormOptions $opts ) {
1219                 // nothing by default
1220         }
1221
1222         /**
1223          * Send the text to be displayed after the options. Should use $this->getOutput()->addWikiText()
1224          * or similar methods to print the text.
1225          *
1226          * @param FormOptions $opts
1227          */
1228         public function setBottomText( FormOptions $opts ) {
1229                 // nothing by default
1230         }
1231
1232         /**
1233          * Get options to be displayed in a form
1234          * @todo This should handle options returned by getDefaultOptions().
1235          * @todo Not called by anything in this class (but is in subclasses), should be
1236          * called by something… doHeader() maybe?
1237          *
1238          * @param FormOptions $opts
1239          * @return array
1240          */
1241         public function getExtraOptions( $opts ) {
1242                 return [];
1243         }
1244
1245         /**
1246          * Return the legend displayed within the fieldset
1247          *
1248          * @return string
1249          */
1250         public function makeLegend() {
1251                 $context = $this->getContext();
1252                 $user = $context->getUser();
1253                 # The legend showing what the letters and stuff mean
1254                 $legend = Html::openElement( 'dl' ) . "\n";
1255                 # Iterates through them and gets the messages for both letter and tooltip
1256                 $legendItems = $context->getConfig()->get( 'RecentChangesFlags' );
1257                 if ( !( $user->useRCPatrol() || $user->useNPPatrol() ) ) {
1258                         unset( $legendItems['unpatrolled'] );
1259                 }
1260                 foreach ( $legendItems as $key => $item ) { # generate items of the legend
1261                         $label = isset( $item['legend'] ) ? $item['legend'] : $item['title'];
1262                         $letter = $item['letter'];
1263                         $cssClass = isset( $item['class'] ) ? $item['class'] : $key;
1264
1265                         $legend .= Html::element( 'dt',
1266                                 [ 'class' => $cssClass ], $context->msg( $letter )->text()
1267                         ) . "\n" .
1268                         Html::rawElement( 'dd',
1269                                 [ 'class' => Sanitizer::escapeClass( 'mw-changeslist-legend-' . $key ) ],
1270                                 $context->msg( $label )->parse()
1271                         ) . "\n";
1272                 }
1273                 # (+-123)
1274                 $legend .= Html::rawElement( 'dt',
1275                         [ 'class' => 'mw-plusminus-pos' ],
1276                         $context->msg( 'recentchanges-legend-plusminus' )->parse()
1277                 ) . "\n";
1278                 $legend .= Html::element(
1279                         'dd',
1280                         [ 'class' => 'mw-changeslist-legend-plusminus' ],
1281                         $context->msg( 'recentchanges-label-plusminus' )->text()
1282                 ) . "\n";
1283                 $legend .= Html::closeElement( 'dl' ) . "\n";
1284
1285                 # Collapsibility
1286                 $legend =
1287                         '<div class="mw-changeslist-legend">' .
1288                                 $context->msg( 'recentchanges-legend-heading' )->parse() .
1289                                 '<div class="mw-collapsible-content">' . $legend . '</div>' .
1290                         '</div>';
1291
1292                 return $legend;
1293         }
1294
1295         /**
1296          * Add page-specific modules.
1297          */
1298         protected function addModules() {
1299                 $out = $this->getOutput();
1300                 // Styles and behavior for the legend box (see makeLegend())
1301                 $out->addModuleStyles( [
1302                         'mediawiki.special.changeslist.legend',
1303                         'mediawiki.special.changeslist',
1304                 ] );
1305                 $out->addModules( 'mediawiki.special.changeslist.legend.js' );
1306         }
1307
1308         protected function getGroupName() {
1309                 return 'changes';
1310         }
1311
1312         /**
1313          * Filter on users' experience levels; this will not be called if nothing is
1314          * selected.
1315          *
1316          * @param string $specialPageClassName Class name of current special page
1317          * @param IContextSource $context Context, for e.g. user
1318          * @param IDatabase $dbr Database, for addQuotes, makeList, and similar
1319          * @param array &$tables Array of tables; see IDatabase::select $table
1320          * @param array &$fields Array of fields; see IDatabase::select $vars
1321          * @param array &$conds Array of conditions; see IDatabase::select $conds
1322          * @param array &$query_options Array of query options; see IDatabase::select $options
1323          * @param array &$join_conds Array of join conditions; see IDatabase::select $join_conds
1324          * @param array $selectedExpLevels The allowed active values, sorted
1325          * @param int $now Number of seconds since the UNIX epoch, or 0 if not given
1326          *   (optional)
1327          */
1328         public function filterOnUserExperienceLevel( $specialPageClassName, $context, $dbr,
1329                 &$tables, &$fields, &$conds, &$query_options, &$join_conds, $selectedExpLevels, $now = 0 ) {
1330
1331                 global $wgLearnerEdits,
1332                         $wgExperiencedUserEdits,
1333                         $wgLearnerMemberSince,
1334                         $wgExperiencedUserMemberSince;
1335
1336                 $LEVEL_COUNT = 3;
1337
1338                 // If all levels are selected, all logged-in users are included (but no
1339                 // anons), so we can short-circuit.
1340                 if ( count( $selectedExpLevels ) === $LEVEL_COUNT ) {
1341                         $conds[] = 'rc_user != 0';
1342                         return;
1343                 }
1344
1345                 $tables[] = 'user';
1346                 $join_conds['user'] = [ 'LEFT JOIN', 'rc_user = user_id' ];
1347
1348                 if ( $now === 0 ) {
1349                         $now = time();
1350                 }
1351                 $secondsPerDay = 86400;
1352                 $learnerCutoff = $now - $wgLearnerMemberSince * $secondsPerDay;
1353                 $experiencedUserCutoff = $now - $wgExperiencedUserMemberSince * $secondsPerDay;
1354
1355                 $aboveNewcomer = $dbr->makeList(
1356                         [
1357                                 'user_editcount >= ' . intval( $wgLearnerEdits ),
1358                                 'user_registration <= ' . $dbr->timestamp( $learnerCutoff ),
1359                         ],
1360                         IDatabase::LIST_AND
1361                 );
1362
1363                 $aboveLearner = $dbr->makeList(
1364                         [
1365                                 'user_editcount >= ' . intval( $wgExperiencedUserEdits ),
1366                                 'user_registration <= ' . $dbr->timestamp( $experiencedUserCutoff ),
1367                         ],
1368                         IDatabase::LIST_AND
1369                 );
1370
1371                 if ( $selectedExpLevels === [ 'newcomer' ] ) {
1372                         $conds[] = "NOT ( $aboveNewcomer )";
1373                 } elseif ( $selectedExpLevels === [ 'learner' ] ) {
1374                         $conds[] = $dbr->makeList(
1375                                 [ $aboveNewcomer, "NOT ( $aboveLearner )" ],
1376                                 IDatabase::LIST_AND
1377                         );
1378                 } elseif ( $selectedExpLevels === [ 'experienced' ] ) {
1379                         $conds[] = $aboveLearner;
1380                 } elseif ( $selectedExpLevels === [ 'learner', 'newcomer' ] ) {
1381                         $conds[] = "NOT ( $aboveLearner )";
1382                 } elseif ( $selectedExpLevels === [ 'experienced', 'newcomer' ] ) {
1383                         $conds[] = $dbr->makeList(
1384                                 [ "NOT ( $aboveNewcomer )", $aboveLearner ],
1385                                 IDatabase::LIST_OR
1386                         );
1387                 } elseif ( $selectedExpLevels === [ 'experienced', 'learner' ] ) {
1388                         $conds[] = $aboveNewcomer;
1389                 }
1390         }
1391 }