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\FakeResultWrapper;
  26 use Wikimedia\Rdbms\IDatabase;
  27
  28 /**
  29  * Special page which uses a ChangesList to show query results.
  30  * @todo Way too many public functions, most of them should be protected
  31  *
  32  * @ingroup SpecialPage
  33  */
  34 abstract class ChangesListSpecialPage extends SpecialPage {
  35         /**
  36          * Preference name for saved queries. Subclasses that use saved queries should override this.
  37          * @var string
  38          */
  39         protected static $savedQueriesPreferenceName;
  40
  41         /** @var string */
  42         protected $rcSubpage;
  43
  44         /** @var FormOptions */
  45         protected $rcOptions;
  46
  47         /** @var array */
  48         protected $customFilters;
  49
  50         // Order of both groups and filters is significant; first is top-most priority,
  51         // descending from there.
  52         // 'showHideSuffix' is a shortcut to and avoid spelling out
  53         // details specific to subclasses here.
  54         /**
  55          * Definition information for the filters and their groups
  56          *
  57          * The value is $groupDefinition, a parameter to the ChangesListFilterGroup constructor.
  58          * However, priority is dynamically added for the core groups, to ease maintenance.
  59          *
  60          * Groups are displayed to the user in the structured UI.  However, if necessary,
  61          * all of the filters in a group can be configured to only display on the
  62          * unstuctured UI, in which case you don't need a group title.  This is done in
  63          * getFilterGroupDefinitionFromLegacyCustomFilters, for example.
  64          *
  65          * @var array $filterGroupDefinitions
  66          */
  67         private $filterGroupDefinitions;
  68
  69         // Same format as filterGroupDefinitions, but for a single group (reviewStatus)
  70         // that is registered conditionally.
  71         private $reviewStatusFilterGroupDefinition;
  72
  73         // Single filter registered conditionally
  74         private $hideCategorizationFilterDefinition;
  75
  76         /**
  77          * Filter groups, and their contained filters
  78          * This is an associative array (with group name as key) of ChangesListFilterGroup objects.
  79          *
  80          * @var array $filterGroups
  81          */
  82         protected $filterGroups = [];
  83
  84         public function __construct( $name, $restriction ) {
  85                 parent::__construct( $name, $restriction );
  86
  87                 $nonRevisionTypes = [ RC_LOG ];
  88                 Hooks::run( 'SpecialWatchlistGetNonRevisionTypes', [ &$nonRevisionTypes ] );
  89
  90                 $this->filterGroupDefinitions = [
  91                         [
  92                                 'name' => 'registration',
  93                                 'title' => 'rcfilters-filtergroup-registration',
  94                                 'class' => ChangesListBooleanFilterGroup::class,
  95                                 'filters' => [
  96                                         [
  97                                                 'name' => 'hideliu',
  98                                                 // rcshowhideliu-show, rcshowhideliu-hide,
  99                                                 // wlshowhideliu
 100                                                 'showHideSuffix' => 'showhideliu',
 101                                                 'default' => false,
 102                                                 'queryCallable' => function ( $specialClassName, $ctx, $dbr, &$tables, &$fields, &$conds,
 103                                                         &$query_options, &$join_conds
 104                                                 ) {
 105                                                         $conds[] = 'rc_user = 0';
 106                                                 },
 107                                                 'isReplacedInStructuredUi' => true,
 108
 109                                         ],
 110                                         [
 111                                                 'name' => 'hideanons',
 112                                                 // rcshowhideanons-show, rcshowhideanons-hide,
 113                                                 // wlshowhideanons
 114                                                 'showHideSuffix' => 'showhideanons',
 115                                                 'default' => false,
 116                                                 'queryCallable' => function ( $specialClassName, $ctx, $dbr, &$tables, &$fields, &$conds,
 117                                                         &$query_options, &$join_conds
 118                                                 ) {
 119                                                         $conds[] = 'rc_user != 0';
 120                                                 },
 121                                                 'isReplacedInStructuredUi' => true,
 122                                         ]
 123                                 ],
 124                         ],
 125
 126                         [
 127                                 'name' => 'userExpLevel',
 128                                 'title' => 'rcfilters-filtergroup-userExpLevel',
 129                                 'class' => ChangesListStringOptionsFilterGroup::class,
 130                                 'isFullCoverage' => true,
 131                                 'filters' => [
 132                                         [
 133                                                 'name' => 'unregistered',
 134                                                 'label' => 'rcfilters-filter-user-experience-level-unregistered-label',
 135                                                 'description' => 'rcfilters-filter-user-experience-level-unregistered-description',
 136                                                 'cssClassSuffix' => 'user-unregistered',
 137                                                 'isRowApplicableCallable' => function ( $ctx, $rc ) {
 138                                                         return !$rc->getAttribute( 'rc_user' );
 139                                                 }
 140                                         ],
 141                                         [
 142                                                 'name' => 'registered',
 143                                                 'label' => 'rcfilters-filter-user-experience-level-registered-label',
 144                                                 'description' => 'rcfilters-filter-user-experience-level-registered-description',
 145                                                 'cssClassSuffix' => 'user-registered',
 146                                                 'isRowApplicableCallable' => function ( $ctx, $rc ) {
 147                                                         return $rc->getAttribute( 'rc_user' );
 148                                                 }
 149                                         ],
 150                                         [
 151                                                 'name' => 'newcomer',
 152                                                 'label' => 'rcfilters-filter-user-experience-level-newcomer-label',
 153                                                 'description' => 'rcfilters-filter-user-experience-level-newcomer-description',
 154                                                 'cssClassSuffix' => 'user-newcomer',
 155                                                 'isRowApplicableCallable' => function ( $ctx, $rc ) {
 156                                                         $performer = $rc->getPerformer();
 157                                                         return $performer && $performer->isLoggedIn() &&
 158                                                                 $performer->getExperienceLevel() === 'newcomer';
 159                                                 }
 160                                         ],
 161                                         [
 162                                                 'name' => 'learner',
 163                                                 'label' => 'rcfilters-filter-user-experience-level-learner-label',
 164                                                 'description' => 'rcfilters-filter-user-experience-level-learner-description',
 165                                                 'cssClassSuffix' => 'user-learner',
 166                                                 'isRowApplicableCallable' => function ( $ctx, $rc ) {
 167                                                         $performer = $rc->getPerformer();
 168                                                         return $performer && $performer->isLoggedIn() &&
 169                                                                 $performer->getExperienceLevel() === 'learner';
 170                                                 },
 171                                         ],
 172                                         [
 173                                                 'name' => 'experienced',
 174                                                 'label' => 'rcfilters-filter-user-experience-level-experienced-label',
 175                                                 'description' => 'rcfilters-filter-user-experience-level-experienced-description',
 176                                                 'cssClassSuffix' => 'user-experienced',
 177                                                 'isRowApplicableCallable' => function ( $ctx, $rc ) {
 178                                                         $performer = $rc->getPerformer();
 179                                                         return $performer && $performer->isLoggedIn() &&
 180                                                                 $performer->getExperienceLevel() === 'experienced';
 181                                                 },
 182                                         ]
 183                                 ],
 184                                 'default' => ChangesListStringOptionsFilterGroup::NONE,
 185                                 'queryCallable' => [ $this, 'filterOnUserExperienceLevel' ],
 186                         ],
 187
 188                         [
 189                                 'name' => 'authorship',
 190                                 'title' => 'rcfilters-filtergroup-authorship',
 191                                 'class' => ChangesListBooleanFilterGroup::class,
 192                                 'filters' => [
 193                                         [
 194                                                 'name' => 'hidemyself',
 195                                                 'label' => 'rcfilters-filter-editsbyself-label',
 196                                                 'description' => 'rcfilters-filter-editsbyself-description',
 197                                                 // rcshowhidemine-show, rcshowhidemine-hide,
 198                                                 // wlshowhidemine
 199                                                 'showHideSuffix' => 'showhidemine',
 200                                                 'default' => false,
 201                                                 'queryCallable' => function ( $specialClassName, $ctx, $dbr, &$tables, &$fields, &$conds,
 202                                                         &$query_options, &$join_conds
 203                                                 ) {
 204                                                         $user = $ctx->getUser();
 205                                                         $conds[] = 'rc_user_text != ' . $dbr->addQuotes( $user->getName() );
 206                                                 },
 207                                                 'cssClassSuffix' => 'self',
 208                                                 'isRowApplicableCallable' => function ( $ctx, $rc ) {
 209                                                         return $ctx->getUser()->equals( $rc->getPerformer() );
 210                                                 },
 211                                         ],
 212                                         [
 213                                                 'name' => 'hidebyothers',
 214                                                 'label' => 'rcfilters-filter-editsbyother-label',
 215                                                 'description' => 'rcfilters-filter-editsbyother-description',
 216                                                 'default' => false,
 217                                                 'queryCallable' => function ( $specialClassName, $ctx, $dbr, &$tables, &$fields, &$conds,
 218                                                         &$query_options, &$join_conds
 219                                                 ) {
 220                                                         $user = $ctx->getUser();
 221                                                         $conds[] = 'rc_user_text = ' . $dbr->addQuotes( $user->getName() );
 222                                                 },
 223                                                 'cssClassSuffix' => 'others',
 224                                                 'isRowApplicableCallable' => function ( $ctx, $rc ) {
 225                                                         return !$ctx->getUser()->equals( $rc->getPerformer() );
 226                                                 },
 227                                         ]
 228                                 ]
 229                         ],
 230
 231                         [
 232                                 'name' => 'automated',
 233                                 'title' => 'rcfilters-filtergroup-automated',
 234                                 'class' => ChangesListBooleanFilterGroup::class,
 235                                 'filters' => [
 236                                         [
 237                                                 'name' => 'hidebots',
 238                                                 'label' => 'rcfilters-filter-bots-label',
 239                                                 'description' => 'rcfilters-filter-bots-description',
 240                                                 // rcshowhidebots-show, rcshowhidebots-hide,
 241                                                 // wlshowhidebots
 242                                                 'showHideSuffix' => 'showhidebots',
 243                                                 'default' => false,
 244                                                 'queryCallable' => function ( $specialClassName, $ctx, $dbr, &$tables, &$fields, &$conds,
 245                                                         &$query_options, &$join_conds
 246                                                 ) {
 247                                                         $conds[] = 'rc_bot = 0';
 248                                                 },
 249                                                 'cssClassSuffix' => 'bot',
 250                                                 'isRowApplicableCallable' => function ( $ctx, $rc ) {
 251                                                         return $rc->getAttribute( 'rc_bot' );
 252                                                 },
 253                                         ],
 254                                         [
 255                                                 'name' => 'hidehumans',
 256                                                 'label' => 'rcfilters-filter-humans-label',
 257                                                 'description' => 'rcfilters-filter-humans-description',
 258                                                 'default' => false,
 259                                                 'queryCallable' => function ( $specialClassName, $ctx, $dbr, &$tables, &$fields, &$conds,
 260                                                         &$query_options, &$join_conds
 261                                                 ) {
 262                                                         $conds[] = 'rc_bot = 1';
 263                                                 },
 264                                                 'cssClassSuffix' => 'human',
 265                                                 'isRowApplicableCallable' => function ( $ctx, $rc ) {
 266                                                         return !$rc->getAttribute( 'rc_bot' );
 267                                                 },
 268                                         ]
 269                                 ]
 270                         ],
 271
 272                         // reviewStatus (conditional)
 273
 274                         [
 275                                 'name' => 'significance',
 276                                 'title' => 'rcfilters-filtergroup-significance',
 277                                 'class' => ChangesListBooleanFilterGroup::class,
 278                                 'priority' => -6,
 279                                 'filters' => [
 280                                         [
 281                                                 'name' => 'hideminor',
 282                                                 'label' => 'rcfilters-filter-minor-label',
 283                                                 'description' => 'rcfilters-filter-minor-description',
 284                                                 // rcshowhideminor-show, rcshowhideminor-hide,
 285                                                 // wlshowhideminor
 286                                                 'showHideSuffix' => 'showhideminor',
 287                                                 'default' => false,
 288                                                 'queryCallable' => function ( $specialClassName, $ctx, $dbr, &$tables, &$fields, &$conds,
 289                                                         &$query_options, &$join_conds
 290                                                 ) {
 291                                                         $conds[] = 'rc_minor = 0';
 292                                                 },
 293                                                 'cssClassSuffix' => 'minor',
 294                                                 'isRowApplicableCallable' => function ( $ctx, $rc ) {
 295                                                         return $rc->getAttribute( 'rc_minor' );
 296                                                 }
 297                                         ],
 298                                         [
 299                                                 'name' => 'hidemajor',
 300                                                 'label' => 'rcfilters-filter-major-label',
 301                                                 'description' => 'rcfilters-filter-major-description',
 302                                                 'default' => false,
 303                                                 'queryCallable' => function ( $specialClassName, $ctx, $dbr, &$tables, &$fields, &$conds,
 304                                                         &$query_options, &$join_conds
 305                                                 ) {
 306                                                         $conds[] = 'rc_minor = 1';
 307                                                 },
 308                                                 'cssClassSuffix' => 'major',
 309                                                 'isRowApplicableCallable' => function ( $ctx, $rc ) {
 310                                                         return !$rc->getAttribute( 'rc_minor' );
 311                                                 }
 312                                         ]
 313                                 ]
 314                         ],
 315
 316                         [
 317                                 'name' => 'lastRevision',
 318                                 'title' => 'rcfilters-filtergroup-lastRevision',
 319                                 'class' => ChangesListBooleanFilterGroup::class,
 320                                 'priority' => -7,
 321                                 'filters' => [
 322                                         [
 323                                                 'name' => 'hidelastrevision',
 324                                                 'label' => 'rcfilters-filter-lastrevision-label',
 325                                                 'description' => 'rcfilters-filter-lastrevision-description',
 326                                                 'default' => false,
 327                                                 'queryCallable' => function ( $specialClassName, $ctx, $dbr, &$tables, &$fields, &$conds,
 328                                                         &$query_options, &$join_conds ) use ( $nonRevisionTypes ) {
 329                                                         $conds[] = $dbr->makeList(
 330                                                                 [
 331                                                                         'rc_this_oldid <> page_latest',
 332                                                                         'rc_type' => $nonRevisionTypes,
 333                                                                 ],
 334                                                                 LIST_OR
 335                                                         );
 336                                                 },
 337                                                 'cssClassSuffix' => 'last',
 338                                                 'isRowApplicableCallable' => function ( $ctx, $rc ) {
 339                                                         return $rc->getAttribute( 'rc_this_oldid' ) === $rc->getAttribute( 'page_latest' );
 340                                                 }
 341                                         ],
 342                                         [
 343                                                 'name' => 'hidepreviousrevisions',
 344                                                 'label' => 'rcfilters-filter-previousrevision-label',
 345                                                 'description' => 'rcfilters-filter-previousrevision-description',
 346                                                 'default' => false,
 347                                                 'queryCallable' => function ( $specialClassName, $ctx, $dbr, &$tables, &$fields, &$conds,
 348                                                         &$query_options, &$join_conds ) use ( $nonRevisionTypes ) {
 349                                                         $conds[] = $dbr->makeList(
 350                                                                 [
 351                                                                         'rc_this_oldid = page_latest',
 352                                                                         'rc_type' => $nonRevisionTypes,
 353                                                                 ],
 354                                                                 LIST_OR
 355                                                         );
 356                                                 },
 357                                                 'cssClassSuffix' => 'previous',
 358                                                 'isRowApplicableCallable' => function ( $ctx, $rc ) {
 359                                                         return $rc->getAttribute( 'rc_this_oldid' ) !== $rc->getAttribute( 'page_latest' );
 360                                                 }
 361                                         ]
 362                                 ]
 363                         ],
 364
 365                         // With extensions, there can be change types that will not be hidden by any of these.
 366                         [
 367                                 'name' => 'changeType',
 368                                 'title' => 'rcfilters-filtergroup-changetype',
 369                                 'class' => ChangesListBooleanFilterGroup::class,
 370                                 'priority' => -8,
 371                                 'filters' => [
 372                                         [
 373                                                 'name' => 'hidepageedits',
 374                                                 'label' => 'rcfilters-filter-pageedits-label',
 375                                                 'description' => 'rcfilters-filter-pageedits-description',
 376                                                 'default' => false,
 377                                                 'priority' => -2,
 378                                                 'queryCallable' => function ( $specialClassName, $ctx, $dbr, &$tables, &$fields, &$conds,
 379                                                         &$query_options, &$join_conds
 380                                                 ) {
 381                                                         $conds[] = 'rc_type != ' . $dbr->addQuotes( RC_EDIT );
 382                                                 },
 383                                                 'cssClassSuffix' => 'src-mw-edit',
 384                                                 'isRowApplicableCallable' => function ( $ctx, $rc ) {
 385                                                         return $rc->getAttribute( 'rc_source' ) === RecentChange::SRC_EDIT;
 386                                                 },
 387                                         ],
 388                                         [
 389                                                 'name' => 'hidenewpages',
 390                                                 'label' => 'rcfilters-filter-newpages-label',
 391                                                 'description' => 'rcfilters-filter-newpages-description',
 392                                                 'default' => false,
 393                                                 'priority' => -3,
 394                                                 'queryCallable' => function ( $specialClassName, $ctx, $dbr, &$tables, &$fields, &$conds,
 395                                                         &$query_options, &$join_conds
 396                                                 ) {
 397                                                         $conds[] = 'rc_type != ' . $dbr->addQuotes( RC_NEW );
 398                                                 },
 399                                                 'cssClassSuffix' => 'src-mw-new',
 400                                                 'isRowApplicableCallable' => function ( $ctx, $rc ) {
 401                                                         return $rc->getAttribute( 'rc_source' ) === RecentChange::SRC_NEW;
 402                                                 },
 403                                         ],
 404
 405                                         // hidecategorization
 406
 407                                         [
 408                                                 'name' => 'hidelog',
 409                                                 'label' => 'rcfilters-filter-logactions-label',
 410                                                 'description' => 'rcfilters-filter-logactions-description',
 411                                                 'default' => false,
 412                                                 'priority' => -5,
 413                                                 'queryCallable' => function ( $specialClassName, $ctx, $dbr, &$tables, &$fields, &$conds,
 414                                                         &$query_options, &$join_conds
 415                                                 ) {
 416                                                         $conds[] = 'rc_type != ' . $dbr->addQuotes( RC_LOG );
 417                                                 },
 418                                                 'cssClassSuffix' => 'src-mw-log',
 419                                                 'isRowApplicableCallable' => function ( $ctx, $rc ) {
 420                                                         return $rc->getAttribute( 'rc_source' ) === RecentChange::SRC_LOG;
 421                                                 }
 422                                         ],
 423                                 ],
 424                         ],
 425
 426                 ];
 427
 428                 $this->reviewStatusFilterGroupDefinition = [
 429                         [
 430                                 'name' => 'reviewStatus',
 431                                 'title' => 'rcfilters-filtergroup-reviewstatus',
 432                                 'class' => ChangesListBooleanFilterGroup::class,
 433                                 'priority' => -5,
 434                                 'filters' => [
 435                                         [
 436                                                 'name' => 'hidepatrolled',
 437                                                 'label' => 'rcfilters-filter-patrolled-label',
 438                                                 'description' => 'rcfilters-filter-patrolled-description',
 439                                                 // rcshowhidepatr-show, rcshowhidepatr-hide
 440                                                 // wlshowhidepatr
 441                                                 'showHideSuffix' => 'showhidepatr',
 442                                                 'default' => false,
 443                                                 'queryCallable' => function ( $specialClassName, $ctx, $dbr, &$tables, &$fields, &$conds,
 444                                                         &$query_options, &$join_conds
 445                                                 ) {
 446                                                         $conds[] = 'rc_patrolled = 0';
 447                                                 },
 448                                                 'cssClassSuffix' => 'patrolled',
 449                                                 'isRowApplicableCallable' => function ( $ctx, $rc ) {
 450                                                         return $rc->getAttribute( 'rc_patrolled' );
 451                                                 },
 452                                         ],
 453                                         [
 454                                                 'name' => 'hideunpatrolled',
 455                                                 'label' => 'rcfilters-filter-unpatrolled-label',
 456                                                 'description' => 'rcfilters-filter-unpatrolled-description',
 457                                                 'default' => false,
 458                                                 'queryCallable' => function ( $specialClassName, $ctx, $dbr, &$tables, &$fields, &$conds,
 459                                                         &$query_options, &$join_conds
 460                                                 ) {
 461                                                         $conds[] = 'rc_patrolled = 1';
 462                                                 },
 463                                                 'cssClassSuffix' => 'unpatrolled',
 464                                                 'isRowApplicableCallable' => function ( $ctx, $rc ) {
 465                                                         return !$rc->getAttribute( 'rc_patrolled' );
 466                                                 },
 467                                         ],
 468                                 ],
 469                         ]
 470                 ];
 471
 472                 $this->hideCategorizationFilterDefinition = [
 473                         'name' => 'hidecategorization',
 474                         'label' => 'rcfilters-filter-categorization-label',
 475                         'description' => 'rcfilters-filter-categorization-description',
 476                         // rcshowhidecategorization-show, rcshowhidecategorization-hide.
 477                         // wlshowhidecategorization
 478                         'showHideSuffix' => 'showhidecategorization',
 479                         'default' => false,
 480                         'priority' => -4,
 481                         'queryCallable' => function ( $specialClassName, $ctx, $dbr, &$tables, &$fields, &$conds,
 482                                 &$query_options, &$join_conds
 483                         ) {
 484                                 $conds[] = 'rc_type != ' . $dbr->addQuotes( RC_CATEGORIZE );
 485                         },
 486                         'cssClassSuffix' => 'src-mw-categorize',
 487                         'isRowApplicableCallable' => function ( $ctx, $rc ) {
 488                                 return $rc->getAttribute( 'rc_source' ) === RecentChange::SRC_CATEGORIZE;
 489                         },
 490                 ];
 491         }
 492
 493         /**
 494          * Check if filters are in conflict and guaranteed to return no results.
 495          *
 496          * @return bool
 497          */
 498         protected function areFiltersInConflict() {
 499                 $opts = $this->getOptions();
 500                 /** @var ChangesListFilterGroup $group */
 501                 foreach ( $this->getFilterGroups() as $group ) {
 502                         if ( $group->getConflictingGroups() ) {
 503                                 wfLogWarning(
 504                                         $group->getName() .
 505                                         " specifies conflicts with other groups but these are not supported yet."
 506                                 );
 507                         }
 508
 509                         /** @var ChangesListFilter $conflictingFilter */
 510                         foreach ( $group->getConflictingFilters() as $conflictingFilter ) {
 511                                 if ( $conflictingFilter->activelyInConflictWithGroup( $group, $opts ) ) {
 512                                         return true;
 513                                 }
 514                         }
 515
 516                         /** @var ChangesListFilter $filter */
 517                         foreach ( $group->getFilters() as $filter ) {
 518                                 /** @var ChangesListFilter $conflictingFilter */
 519                                 foreach ( $filter->getConflictingFilters() as $conflictingFilter ) {
 520                                         if (
 521                                                 $conflictingFilter->activelyInConflictWithFilter( $filter, $opts ) &&
 522                                                 $filter->activelyInConflictWithFilter( $conflictingFilter, $opts )
 523                                         ) {
 524                                                 return true;
 525                                         }
 526                                 }
 527
 528                         }
 529
 530                 }
 531
 532                 return false;
 533         }
 534
 535         /**
 536          * Main execution point
 537          *
 538          * @param string $subpage
 539          */
 540         public function execute( $subpage ) {
 541                 $this->rcSubpage = $subpage;
 542
 543                 $this->considerActionsForDefaultSavedQuery();
 544
 545                 $rows = $this->getRows();
 546                 $opts = $this->getOptions();
 547                 if ( $rows === false ) {
 548                         $rows = new FakeResultWrapper( [] );
 549                 }
 550
 551                 // Used by Structured UI app to get results without MW chrome
 552                 if ( $this->getRequest()->getVal( 'action' ) === 'render' ) {
 553                         $this->getOutput()->setArticleBodyOnly( true );
 554                 }
 555
 556                 // Used by "live update" and "view newest" to check
 557                 // if there's new changes with minimal data transfer
 558                 if ( $this->getRequest()->getBool( 'peek' ) ) {
 559                         $code = $rows->numRows() > 0 ? 200 : 204;
 560                         $this->getOutput()->setStatusCode( $code );
 561                         return;
 562                 }
 563
 564                 $batch = new LinkBatch;
 565                 foreach ( $rows as $row ) {
 566                         $batch->add( NS_USER, $row->rc_user_text );
 567                         $batch->add( NS_USER_TALK, $row->rc_user_text );
 568                         $batch->add( $row->rc_namespace, $row->rc_title );
 569                         if ( $row->rc_source === RecentChange::SRC_LOG ) {
 570                                 $formatter = LogFormatter::newFromRow( $row );
 571                                 foreach ( $formatter->getPreloadTitles() as $title ) {
 572                                         $batch->addObj( $title );
 573                                 }
 574                         }
 575                 }
 576                 $batch->execute();
 577
 578                 $this->setHeaders();
 579                 $this->outputHeader();
 580                 $this->addModules();
 581                 $this->webOutput( $rows, $opts );
 582
 583                 $rows->free();
 584
 585                 if ( $this->getConfig()->get( 'EnableWANCacheReaper' ) ) {
 586                         // Clean up any bad page entries for titles showing up in RC
 587                         DeferredUpdates::addUpdate( new WANCacheReapUpdate(
 588                                 $this->getDB(),
 589                                 LoggerFactory::getInstance( 'objectcache' )
 590                         ) );
 591                 }
 592
 593                 $this->includeRcFiltersApp();
 594         }
 595
 596         /**
 597          * Check whether or not the page should load defaults, and if so, whether
 598          * a default saved query is relevant to be redirected to. If it is relevant,
 599          * redirect properly with all necessary query parameters.
 600          */
 601         protected function considerActionsForDefaultSavedQuery() {
 602                 if ( !$this->isStructuredFilterUiEnabled() ) {
 603                         return;
 604                 }
 605
 606                 $knownParams = call_user_func_array(
 607                         [ $this->getRequest(), 'getValues' ],
 608                         array_keys( $this->getOptions()->getAllValues() )
 609                 );
 610
 611                 // HACK: Temporarily until we can properly define "sticky" filters and parameters,
 612                 // we need to exclude several parameters we know should not be counted towards preventing
 613                 // the loading of defaults.
 614                 $excludedParams = [ 'limit' => '', 'days' => '', 'enhanced' => '', 'from' => '' ];
 615                 $knownParams = array_diff_key( $knownParams, $excludedParams );
 616
 617                 if (
 618                         // If there are NO known parameters in the URL request
 619                         // (that are not excluded) then we need to check into loading
 620                         // the default saved query
 621                         count( $knownParams ) === 0
 622                 ) {
 623                         // Get the saved queries data and parse it
 624                         $savedQueries = FormatJson::decode(
 625                                 $this->getUser()->getOption( static::$savedQueriesPreferenceName ),
 626                                 true
 627                         );
 628
 629                         if ( $savedQueries && isset( $savedQueries[ 'default' ] ) ) {
 630                                 // Only load queries that are 'version' 2, since those
 631                                 // have parameter representation
 632                                 if ( isset( $savedQueries[ 'version' ] ) && $savedQueries[ 'version' ] === '2' ) {
 633                                         $savedQueryDefaultID = $savedQueries[ 'default' ];
 634                                         $defaultQuery = $savedQueries[ 'queries' ][ $savedQueryDefaultID ][ 'data' ];
 635
 636                                         // Build the entire parameter list
 637                                         $query = array_merge(
 638                                                 $defaultQuery[ 'params' ],
 639                                                 $defaultQuery[ 'highlights' ],
 640                                                 [
 641                                                         'urlversion' => '2',
 642                                                 ]
 643                                         );
 644                                         // Add to the query any parameters that we may have ignored before
 645                                         // but are still valid and requested in the URL
 646                                         $query = array_merge( $this->getRequest()->getValues(), $query );
 647                                         unset( $query[ 'title' ] );
 648                                         $this->getOutput()->redirect( $this->getPageTitle()->getCanonicalURL( $query ) );
 649                                 } else {
 650                                         // There's a default, but the version is not 2, and the server can't
 651                                         // actually recognize the query itself. This happens if it is before
 652                                         // the conversion, so we need to tell the UI to reload saved query as
 653                                         // it does the conversion to version 2
 654                                         $this->getOutput()->addJsConfigVars(
 655                                                 'wgStructuredChangeFiltersDefaultSavedQueryExists',
 656                                                 true
 657                                         );
 658
 659                                         // Add the class that tells the frontend it is still loading
 660                                         // another query
 661                                         $this->getOutput()->addBodyClasses( 'mw-rcfilters-ui-loading' );
 662                                 }
 663                         }
 664                 }
 665         }
 666
 667         /**
 668          * Include the modules and configuration for the RCFilters app.
 669          * Conditional on the user having the feature enabled.
 670          *
 671          * If it is disabled, add a <body> class marking that
 672          */
 673         protected function includeRcFiltersApp() {
 674                 $out = $this->getOutput();
 675                 if ( $this->isStructuredFilterUiEnabled() ) {
 676                         $jsData = $this->getStructuredFilterJsData();
 677
 678                         $messages = [];
 679                         foreach ( $jsData['messageKeys'] as $key ) {
 680                                 $messages[$key] = $this->msg( $key )->plain();
 681                         }
 682
 683                         $out->addBodyClasses( 'mw-rcfilters-enabled' );
 684
 685                         $out->addHTML(
 686                                 ResourceLoader::makeInlineScript(
 687                                         ResourceLoader::makeMessageSetScript( $messages )
 688                                 )
 689                         );
 690
 691                         $out->addJsConfigVars( 'wgStructuredChangeFilters', $jsData['groups'] );
 692
 693                         $out->addJsConfigVars(
 694                                 'wgRCFiltersChangeTags',
 695                                 $this->getChangeTagList()
 696                         );
 697                         $out->addJsConfigVars(
 698                                 'StructuredChangeFiltersDisplayConfig',
 699                                 [
 700                                         'maxDays' => (int)$this->getConfig()->get( 'RCMaxAge' ) / ( 24 * 3600 ), // Translate to days
 701                                         'limitArray' => $this->getConfig()->get( 'RCLinkLimits' ),
 702                                         'limitDefault' => $this->getDefaultLimit(),
 703                                         'daysArray' => $this->getConfig()->get( 'RCLinkDays' ),
 704                                         'daysDefault' => $this->getDefaultDays(),
 705                                 ]
 706                         );
 707
 708                         $out->addJsConfigVars(
 709                                 'wgStructuredChangeFiltersSavedQueriesPreferenceName',
 710                                 static::$savedQueriesPreferenceName
 711                         );
 712
 713                         $out->addJsConfigVars(
 714                                 'StructuredChangeFiltersLiveUpdatePollingRate',
 715                                 $this->getConfig()->get( 'StructuredChangeFiltersLiveUpdatePollingRate' )
 716                         );
 717                 } else {
 718                         $out->addBodyClasses( 'mw-rcfilters-disabled' );
 719                 }
 720         }
 721
 722         /**
 723          * Fetch the change tags list for the front end
 724          *
 725          * @return Array Tag data
 726          */
 727         protected function getChangeTagList() {
 728                 $cache = ObjectCache::getMainWANInstance();
 729                 $context = $this->getContext();
 730                 return $cache->getWithSetCallback(
 731                         $cache->makeKey( 'changeslistspecialpage-changetags', $context->getLanguage()->getCode() ),
 732                         $cache::TTL_MINUTE * 10,
 733                         function () use ( $context ) {
 734                                 $explicitlyDefinedTags = array_fill_keys( ChangeTags::listExplicitlyDefinedTags(), 0 );
 735                                 $softwareActivatedTags = array_fill_keys( ChangeTags::listSoftwareActivatedTags(), 0 );
 736
 737                                 // Hit counts disabled for perf reasons, see T169997
 738                                 /*
 739                                 $tagStats = ChangeTags::tagUsageStatistics();
 740                                 $tagHitCounts = array_merge( $explicitlyDefinedTags, $softwareActivatedTags, $tagStats );
 741
 742                                 // Sort by hits
 743                                 arsort( $tagHitCounts );
 744                                 */
 745                                 $tagHitCounts = array_merge( $explicitlyDefinedTags, $softwareActivatedTags );
 746
 747                                 // Build the list and data
 748                                 $result = [];
 749                                 foreach ( $tagHitCounts as $tagName => $hits ) {
 750                                         if (
 751                                                 // Only get active tags
 752                                                 isset( $explicitlyDefinedTags[ $tagName ] ) ||
 753                                                 isset( $softwareActivatedTags[ $tagName ] )
 754                                         ) {
 755                                                 // Parse description
 756                                                 $desc = ChangeTags::tagLongDescriptionMessage( $tagName, $context );
 757
 758                                                 $result[] = [
 759                                                         'name' => $tagName,
 760                                                         'label' => Sanitizer::stripAllTags(
 761                                                                 ChangeTags::tagDescription( $tagName, $context )
 762                                                         ),
 763                                                         'description' => $desc ? Sanitizer::stripAllTags( $desc->parse() ) : '',
 764                                                         'cssClass' => Sanitizer::escapeClass( 'mw-tag-' . $tagName ),
 765                                                         'hits' => $hits,
 766                                                 ];
 767                                         }
 768                                 }
 769
 770                                 // Instead of sorting by hit count (disabled, see above), sort by display name
 771                                 usort( $result, function ( $a, $b ) {
 772                                         return strcasecmp( $a['label'], $b['label'] );
 773                                 } );
 774
 775                                 return $result;
 776                         },
 777                         [
 778                                 'lockTSE' => 30
 779                         ]
 780                 );
 781         }
 782
 783         /**
 784          * Add the "no results" message to the output
 785          */
 786         protected function outputNoResults() {
 787                 $this->getOutput()->addHTML(
 788                         '<div class="mw-changeslist-empty">' .
 789                         $this->msg( 'recentchanges-noresult' )->parse() .
 790                         '</div>'
 791                 );
 792         }
 793
 794         /**
 795          * Get the database result for this special page instance. Used by ApiFeedRecentChanges.
 796          *
 797          * @return bool|ResultWrapper Result or false
 798          */
 799         public function getRows() {
 800                 $opts = $this->getOptions();
 801
 802                 $tables = [];
 803                 $fields = [];
 804                 $conds = [];
 805                 $query_options = [];
 806                 $join_conds = [];
 807                 $this->buildQuery( $tables, $fields, $conds, $query_options, $join_conds, $opts );
 808
 809                 return $this->doMainQuery( $tables, $fields, $conds, $query_options, $join_conds, $opts );
 810         }
 811
 812         /**
 813          * Get the current FormOptions for this request
 814          *
 815          * @return FormOptions
 816          */
 817         public function getOptions() {
 818                 if ( $this->rcOptions === null ) {
 819                         $this->rcOptions = $this->setup( $this->rcSubpage );
 820                 }
 821
 822                 return $this->rcOptions;
 823         }
 824
 825         /**
 826          * Register all filters and their groups (including those from hooks), plus handle
 827          * conflicts and defaults.
 828          *
 829          * You might want to customize these in the same method, in subclasses.  You can
 830          * call getFilterGroup to access a group, and (on the group) getFilter to access a
 831          * filter, then make necessary modfications to the filter or group (e.g. with
 832          * setDefault).
 833          */
 834         protected function registerFilters() {
 835                 $this->registerFiltersFromDefinitions( $this->filterGroupDefinitions );
 836
 837                 // Make sure this is not being transcluded (we don't want to show this
 838                 // information to all users just because the user that saves the edit can
 839                 // patrol or is logged in)
 840                 if ( !$this->including() && $this->getUser()->useRCPatrol() ) {
 841                         $this->registerFiltersFromDefinitions( $this->reviewStatusFilterGroupDefinition );
 842                 }
 843
 844                 $changeTypeGroup = $this->getFilterGroup( 'changeType' );
 845
 846                 if ( $this->getConfig()->get( 'RCWatchCategoryMembership' ) ) {
 847                         $transformedHideCategorizationDef = $this->transformFilterDefinition(
 848                                 $this->hideCategorizationFilterDefinition
 849                         );
 850
 851                         $transformedHideCategorizationDef['group'] = $changeTypeGroup;
 852
 853                         $hideCategorization = new ChangesListBooleanFilter(
 854                                 $transformedHideCategorizationDef
 855                         );
 856                 }
 857
 858                 Hooks::run( 'ChangesListSpecialPageStructuredFilters', [ $this ] );
 859
 860                 $unstructuredGroupDefinition =
 861                         $this->getFilterGroupDefinitionFromLegacyCustomFilters(
 862                                 $this->getCustomFilters()
 863                         );
 864                 $this->registerFiltersFromDefinitions( [ $unstructuredGroupDefinition ] );
 865
 866                 $userExperienceLevel = $this->getFilterGroup( 'userExpLevel' );
 867                 $registered = $userExperienceLevel->getFilter( 'registered' );
 868                 $registered->setAsSupersetOf( $userExperienceLevel->getFilter( 'newcomer' ) );
 869                 $registered->setAsSupersetOf( $userExperienceLevel->getFilter( 'learner' ) );
 870                 $registered->setAsSupersetOf( $userExperienceLevel->getFilter( 'experienced' ) );
 871
 872                 $categoryFilter = $changeTypeGroup->getFilter( 'hidecategorization' );
 873                 $logactionsFilter = $changeTypeGroup->getFilter( 'hidelog' );
 874                 $pagecreationFilter = $changeTypeGroup->getFilter( 'hidenewpages' );
 875
 876                 $significanceTypeGroup = $this->getFilterGroup( 'significance' );
 877                 $hideMinorFilter = $significanceTypeGroup->getFilter( 'hideminor' );
 878
 879                 // categoryFilter is conditional; see registerFilters
 880                 if ( $categoryFilter !== null ) {
 881                         $hideMinorFilter->conflictsWith(
 882                                 $categoryFilter,
 883                                 'rcfilters-hideminor-conflicts-typeofchange-global',
 884                                 'rcfilters-hideminor-conflicts-typeofchange',
 885                                 'rcfilters-typeofchange-conflicts-hideminor'
 886                         );
 887                 }
 888                 $hideMinorFilter->conflictsWith(
 889                         $logactionsFilter,
 890                         'rcfilters-hideminor-conflicts-typeofchange-global',
 891                         'rcfilters-hideminor-conflicts-typeofchange',
 892                         'rcfilters-typeofchange-conflicts-hideminor'
 893                 );
 894                 $hideMinorFilter->conflictsWith(
 895                         $pagecreationFilter,
 896                         'rcfilters-hideminor-conflicts-typeofchange-global',
 897                         'rcfilters-hideminor-conflicts-typeofchange',
 898                         'rcfilters-typeofchange-conflicts-hideminor'
 899                 );
 900         }
 901
 902         /**
 903          * Transforms filter definition to prepare it for constructor.
 904          *
 905          * See overrides of this method as well.
 906          *
 907          * @param array $filterDefinition Original filter definition
 908          *
 909          * @return array Transformed definition
 910          */
 911         protected function transformFilterDefinition( array $filterDefinition ) {
 912                 return $filterDefinition;
 913         }
 914
 915         /**
 916          * Register filters from a definition object
 917          *
 918          * Array specifying groups and their filters; see Filter and
 919          * ChangesListFilterGroup constructors.
 920          *
 921          * There is light processing to simplify core maintenance.
 922          * @param array $definition
 923          */
 924         protected function registerFiltersFromDefinitions( array $definition ) {
 925                 $autoFillPriority = -1;
 926                 foreach ( $definition as $groupDefinition ) {
 927                         if ( !isset( $groupDefinition['priority'] ) ) {
 928                                 $groupDefinition['priority'] = $autoFillPriority;
 929                         } else {
 930                                 // If it's explicitly specified, start over the auto-fill
 931                                 $autoFillPriority = $groupDefinition['priority'];
 932                         }
 933
 934                         $autoFillPriority--;
 935
 936                         $className = $groupDefinition['class'];
 937                         unset( $groupDefinition['class'] );
 938
 939                         foreach ( $groupDefinition['filters'] as &$filterDefinition ) {
 940                                 $filterDefinition = $this->transformFilterDefinition( $filterDefinition );
 941                         }
 942
 943                         $this->registerFilterGroup( new $className( $groupDefinition ) );
 944                 }
 945         }
 946
 947         /**
 948          * Get filter group definition from legacy custom filters
 949          *
 950          * @param array $customFilters Custom filters from legacy hooks
 951          * @return array Group definition
 952          */
 953         protected function getFilterGroupDefinitionFromLegacyCustomFilters( array $customFilters ) {
 954                 // Special internal unstructured group
 955                 $unstructuredGroupDefinition = [
 956                         'name' => 'unstructured',
 957                         'class' => ChangesListBooleanFilterGroup::class,
 958                         'priority' => -1, // Won't display in structured
 959                         'filters' => [],
 960                 ];
 961
 962                 foreach ( $customFilters as $name => $params ) {
 963                         $unstructuredGroupDefinition['filters'][] = [
 964                                 'name' => $name,
 965                                 'showHide' => $params['msg'],
 966                                 'default' => $params['default'],
 967                         ];
 968                 }
 969
 970                 return $unstructuredGroupDefinition;
 971         }
 972
 973         /**
 974          * Register all the filters, including legacy hook-driven ones.
 975          * Then create a FormOptions object with options as specified by the user
 976          *
 977          * @param array $parameters
 978          *
 979          * @return FormOptions
 980          */
 981         public function setup( $parameters ) {
 982                 $this->registerFilters();
 983
 984                 $opts = $this->getDefaultOptions();
 985
 986                 $opts = $this->fetchOptionsFromRequest( $opts );
 987
 988                 // Give precedence to subpage syntax
 989                 if ( $parameters !== null ) {
 990                         $this->parseParameters( $parameters, $opts );
 991                 }
 992
 993                 $this->validateOptions( $opts );
 994
 995                 return $opts;
 996         }
 997
 998         /**
 999          * Get a FormOptions object containing the default options. By default, returns
1000          * some basic options.  The filters listed explicitly here are overriden in this
1001          * method, in subclasses, but most filters (e.g. hideminor, userExpLevel filters,
1002          * and more) are structured.  Structured filters are overriden in registerFilters.
1003          * not here.
1004          *
1005          * @return FormOptions
1006          */
1007         public function getDefaultOptions() {
1008                 $opts = new FormOptions();
1009                 $structuredUI = $this->isStructuredFilterUiEnabled();
1010                 // If urlversion=2 is set, ignore the filter defaults and set them all to false/empty
1011                 $useDefaults = $this->getRequest()->getInt( 'urlversion' ) !== 2;
1012
1013                 // Add all filters
1014                 /** @var ChangesListFilterGroup $filterGroup */
1015                 foreach ( $this->filterGroups as $filterGroup ) {
1016                         // URL parameters can be per-group, like 'userExpLevel',
1017                         // or per-filter, like 'hideminor'.
1018                         if ( $filterGroup->isPerGroupRequestParameter() ) {
1019                                 $opts->add( $filterGroup->getName(), $useDefaults ? $filterGroup->getDefault() : '' );
1020                         } else {
1021                                 /** @var ChangesListBooleanFilter $filter */
1022                                 foreach ( $filterGroup->getFilters() as $filter ) {
1023                                         $opts->add( $filter->getName(), $useDefaults ? $filter->getDefault( $structuredUI ) : false );
1024                                 }
1025                         }
1026                 }
1027
1028                 $opts->add( 'namespace', '', FormOptions::STRING );
1029                 $opts->add( 'invert', false );
1030                 $opts->add( 'associated', false );
1031                 $opts->add( 'urlversion', 1 );
1032                 $opts->add( 'tagfilter', '' );
1033
1034                 $opts->add( 'days', $this->getDefaultDays(), FormOptions::FLOAT );
1035                 $opts->add( 'limit', $this->getDefaultLimit(), FormOptions::INT );
1036
1037                 $opts->add( 'from', '' );
1038
1039                 return $opts;
1040         }
1041
1042         /**
1043          * Register a structured changes list filter group
1044          *
1045          * @param ChangesListFilterGroup $group
1046          */
1047         public function registerFilterGroup( ChangesListFilterGroup $group ) {
1048                 $groupName = $group->getName();
1049
1050                 $this->filterGroups[$groupName] = $group;
1051         }
1052
1053         /**
1054          * Gets the currently registered filters groups
1055          *
1056          * @return array Associative array of ChangesListFilterGroup objects, with group name as key
1057          */
1058         protected function getFilterGroups() {
1059                 return $this->filterGroups;
1060         }
1061
1062         /**
1063          * Gets a specified ChangesListFilterGroup by name
1064          *
1065          * @param string $groupName Name of group
1066          *
1067          * @return ChangesListFilterGroup|null Group, or null if not registered
1068          */
1069         public function getFilterGroup( $groupName ) {
1070                 return isset( $this->filterGroups[$groupName] ) ?
1071                         $this->filterGroups[$groupName] :
1072                         null;
1073         }
1074
1075         // Currently, this intentionally only includes filters that display
1076         // in the structured UI.  This can be changed easily, though, if we want
1077         // to include data on filters that use the unstructured UI.  messageKeys is a
1078         // special top-level value, with the value being an array of the message keys to
1079         // send to the client.
1080         /**
1081          * Gets structured filter information needed by JS
1082          *
1083          * @return array Associative array
1084          * * array $return['groups'] Group data
1085          * * array $return['messageKeys'] Array of message keys
1086          */
1087         public function getStructuredFilterJsData() {
1088                 $output = [
1089                         'groups' => [],
1090                         'messageKeys' => [],
1091                 ];
1092
1093                 usort( $this->filterGroups, function ( $a, $b ) {
1094                         return $b->getPriority() - $a->getPriority();
1095                 } );
1096
1097                 foreach ( $this->filterGroups as $groupName => $group ) {
1098                         $groupOutput = $group->getJsData( $this );
1099                         if ( $groupOutput !== null ) {
1100                                 $output['messageKeys'] = array_merge(
1101                                         $output['messageKeys'],
1102                                         $groupOutput['messageKeys']
1103                                 );
1104
1105                                 unset( $groupOutput['messageKeys'] );
1106                                 $output['groups'][] = $groupOutput;
1107                         }
1108                 }
1109
1110                 return $output;
1111         }
1112
1113         /**
1114          * Get custom show/hide filters using deprecated ChangesListSpecialPageFilters
1115          * hook.
1116          *
1117          * @return array Map of filter URL param names to properties (msg/default)
1118          */
1119         protected function getCustomFilters() {
1120                 if ( $this->customFilters === null ) {
1121                         $this->customFilters = [];
1122                         Hooks::run( 'ChangesListSpecialPageFilters', [ $this, &$this->customFilters ], '1.29' );
1123                 }
1124
1125                 return $this->customFilters;
1126         }
1127
1128         /**
1129          * Fetch values for a FormOptions object from the WebRequest associated with this instance.
1130          *
1131          * Intended for subclassing, e.g. to add a backwards-compatibility layer.
1132          *
1133          * @param FormOptions $opts
1134          * @return FormOptions
1135          */
1136         protected function fetchOptionsFromRequest( $opts ) {
1137                 $opts->fetchValuesFromRequest( $this->getRequest() );
1138
1139                 return $opts;
1140         }
1141
1142         /**
1143          * Process $par and put options found in $opts. Used when including the page.
1144          *
1145          * @param string $par
1146          * @param FormOptions $opts
1147          */
1148         public function parseParameters( $par, FormOptions $opts ) {
1149                 $stringParameterNameSet = [];
1150                 $hideParameterNameSet = [];
1151
1152                 // URL parameters can be per-group, like 'userExpLevel',
1153                 // or per-filter, like 'hideminor'.
1154
1155                 foreach ( $this->filterGroups as $filterGroup ) {
1156                         if ( $filterGroup->isPerGroupRequestParameter() ) {
1157                                 $stringParameterNameSet[$filterGroup->getName()] = true;
1158                         } elseif ( $filterGroup->getType() === ChangesListBooleanFilterGroup::TYPE ) {
1159                                 foreach ( $filterGroup->getFilters() as $filter ) {
1160                                         $hideParameterNameSet[$filter->getName()] = true;
1161                                 }
1162                         }
1163                 }
1164
1165                 $bits = preg_split( '/\s*,\s*/', trim( $par ) );
1166                 foreach ( $bits as $bit ) {
1167                         $m = [];
1168                         if ( isset( $hideParameterNameSet[$bit] ) ) {
1169                                 // hidefoo => hidefoo=true
1170                                 $opts[$bit] = true;
1171                         } elseif ( isset( $hideParameterNameSet["hide$bit"] ) ) {
1172                                 // foo => hidefoo=false
1173                                 $opts["hide$bit"] = false;
1174                         } elseif ( preg_match( '/^(.*)=(.*)$/', $bit, $m ) ) {
1175                                 if ( isset( $stringParameterNameSet[$m[1]] ) ) {
1176                                         $opts[$m[1]] = $m[2];
1177                                 }
1178                         }
1179                 }
1180         }
1181
1182         /**
1183          * Validate a FormOptions object generated by getDefaultOptions() with values already populated.
1184          *
1185          * @param FormOptions $opts
1186          */
1187         public function validateOptions( FormOptions $opts ) {
1188                 if ( $this->fixContradictoryOptions( $opts ) ) {
1189                         $query = wfArrayToCgi( $this->convertParamsForLink( $opts->getChangedValues() ) );
1190                         $this->getOutput()->redirect( $this->getPageTitle()->getCanonicalURL( $query ) );
1191                 }
1192
1193                 $opts->validateIntBounds( 'limit', 0, 5000 );
1194                 $opts->validateBounds( 'days', 0, $this->getConfig()->get( 'RCMaxAge' ) / ( 3600 * 24 ) );
1195         }
1196
1197         /**
1198          * Fix invalid options by resetting pairs that should never appear together.
1199          *
1200          * @param FormOptions $opts
1201          * @return bool True if any option was reset
1202          */
1203         private function fixContradictoryOptions( FormOptions $opts ) {
1204                 $fixed = $this->fixBackwardsCompatibilityOptions( $opts );
1205
1206                 foreach ( $this->filterGroups as $filterGroup ) {
1207                         if ( $filterGroup instanceof ChangesListBooleanFilterGroup ) {
1208                                 $filters = $filterGroup->getFilters();
1209
1210                                 if ( count( $filters ) === 1 ) {
1211                                         // legacy boolean filters should not be considered
1212                                         continue;
1213                                 }
1214
1215                                 $allInGroupEnabled = array_reduce(
1216                                         $filters,
1217                                         function ( $carry, $filter ) use ( $opts ) {
1218                                                 return $carry && $opts[ $filter->getName() ];
1219                                         },
1220                                         /* initialValue */ count( $filters ) > 0
1221                                 );
1222
1223                                 if ( $allInGroupEnabled ) {
1224                                         foreach ( $filters as $filter ) {
1225                                                 $opts[ $filter->getName() ] = false;
1226                                         }
1227
1228                                         $fixed = true;
1229                                 }
1230                         }
1231                 }
1232
1233                 return $fixed;
1234         }
1235
1236         /**
1237          * Fix a special case (hideanons=1 and hideliu=1) in a special way, for backwards
1238          * compatibility.
1239          *
1240          * This is deprecated and may be removed.
1241          *
1242          * @param FormOptions $opts
1243          * @return bool True if this change was mode
1244          */
1245         private function fixBackwardsCompatibilityOptions( FormOptions $opts ) {
1246                 if ( $opts['hideanons'] && $opts['hideliu'] ) {
1247                         $opts->reset( 'hideanons' );
1248                         if ( !$opts['hidebots'] ) {
1249                                 $opts->reset( 'hideliu' );
1250                                 $opts['hidehumans'] = 1;
1251                         }
1252
1253                         return true;
1254                 }
1255
1256                 return false;
1257         }
1258
1259         /**
1260          * Convert parameters values from true/false to 1/0
1261          * so they are not omitted by wfArrayToCgi()
1262          * Bug 36524
1263          *
1264          * @param array $params
1265          * @return array
1266          */
1267         protected function convertParamsForLink( $params ) {
1268                 foreach ( $params as &$value ) {
1269                         if ( $value === false ) {
1270                                 $value = '0';
1271                         }
1272                 }
1273                 unset( $value );
1274                 return $params;
1275         }
1276
1277         /**
1278          * Sets appropriate tables, fields, conditions, etc. depending on which filters
1279          * the user requested.
1280          *
1281          * @param array &$tables Array of tables; see IDatabase::select $table
1282          * @param array &$fields Array of fields; see IDatabase::select $vars
1283          * @param array &$conds Array of conditions; see IDatabase::select $conds
1284          * @param array &$query_options Array of query options; see IDatabase::select $options
1285          * @param array &$join_conds Array of join conditions; see IDatabase::select $join_conds
1286          * @param FormOptions $opts
1287          */
1288         protected function buildQuery( &$tables, &$fields, &$conds, &$query_options,
1289                 &$join_conds, FormOptions $opts
1290         ) {
1291                 $dbr = $this->getDB();
1292                 $isStructuredUI = $this->isStructuredFilterUiEnabled();
1293
1294                 foreach ( $this->filterGroups as $filterGroup ) {
1295                         // URL parameters can be per-group, like 'userExpLevel',
1296                         // or per-filter, like 'hideminor'.
1297                         if ( $filterGroup->isPerGroupRequestParameter() ) {
1298                                 $filterGroup->modifyQuery( $dbr, $this, $tables, $fields, $conds,
1299                                         $query_options, $join_conds, $opts[$filterGroup->getName()] );
1300                         } else {
1301                                 foreach ( $filterGroup->getFilters() as $filter ) {
1302                                         if ( $filter->isActive( $opts, $isStructuredUI ) ) {
1303                                                 $filter->modifyQuery( $dbr, $this, $tables, $fields, $conds,
1304                                                         $query_options, $join_conds );
1305                                         }
1306                                 }
1307                         }
1308                 }
1309
1310                 // Namespace filtering
1311                 if ( $opts[ 'namespace' ] !== '' ) {
1312                         $namespaces = explode( ';', $opts[ 'namespace' ] );
1313
1314                         if ( $opts[ 'associated' ] ) {
1315                                 $associatedNamespaces = array_map(
1316                                         function ( $ns ) {
1317                                                 return MWNamespace::getAssociated( $ns );
1318                                         },
1319                                         $namespaces
1320                                 );
1321                                 $namespaces = array_unique( array_merge( $namespaces, $associatedNamespaces ) );
1322                         }
1323
1324                         if ( count( $namespaces ) === 1 ) {
1325                                 $operator = $opts[ 'invert' ] ? '!=' : '=';
1326                                 $value = $dbr->addQuotes( reset( $namespaces ) );
1327                         } else {
1328                                 $operator = $opts[ 'invert' ] ? 'NOT IN' : 'IN';
1329                                 sort( $namespaces );
1330                                 $value = '(' . $dbr->makeList( $namespaces ) . ')';
1331                         }
1332                         $conds[] = "rc_namespace $operator $value";
1333                 }
1334
1335                 // Calculate cutoff
1336                 $cutoff_unixtime = time() - $opts['days'] * 3600 * 24;
1337                 $cutoff = $dbr->timestamp( $cutoff_unixtime );
1338
1339                 $fromValid = preg_match( '/^[0-9]{14}$/', $opts['from'] );
1340                 if ( $fromValid && $opts['from'] > wfTimestamp( TS_MW, $cutoff ) ) {
1341                         $cutoff = $dbr->timestamp( $opts['from'] );
1342                 } else {
1343                         $opts->reset( 'from' );
1344                 }
1345
1346                 $conds[] = 'rc_timestamp >= ' . $dbr->addQuotes( $cutoff );
1347         }
1348
1349         /**
1350          * Process the query
1351          *
1352          * @param array $tables Array of tables; see IDatabase::select $table
1353          * @param array $fields Array of fields; see IDatabase::select $vars
1354          * @param array $conds Array of conditions; see IDatabase::select $conds
1355          * @param array $query_options Array of query options; see IDatabase::select $options
1356          * @param array $join_conds Array of join conditions; see IDatabase::select $join_conds
1357          * @param FormOptions $opts
1358          * @return bool|ResultWrapper Result or false
1359          */
1360         protected function doMainQuery( $tables, $fields, $conds,
1361                 $query_options, $join_conds, FormOptions $opts
1362         ) {
1363                 $tables[] = 'recentchanges';
1364                 $fields = array_merge( RecentChange::selectFields(), $fields );
1365
1366                 ChangeTags::modifyDisplayQuery(
1367                         $tables,
1368                         $fields,
1369                         $conds,
1370                         $join_conds,
1371                         $query_options,
1372                         ''
1373                 );
1374
1375                 if ( !$this->runMainQueryHook( $tables, $fields, $conds, $query_options, $join_conds,
1376                         $opts )
1377                 ) {
1378                         return false;
1379                 }
1380
1381                 $dbr = $this->getDB();
1382
1383                 return $dbr->select(
1384                         $tables,
1385                         $fields,
1386                         $conds,
1387                         __METHOD__,
1388                         $query_options,
1389                         $join_conds
1390                 );
1391         }
1392
1393         protected function runMainQueryHook( &$tables, &$fields, &$conds,
1394                 &$query_options, &$join_conds, $opts
1395         ) {
1396                 return Hooks::run(
1397                         'ChangesListSpecialPageQuery',
1398                         [ $this->getName(), &$tables, &$fields, &$conds, &$query_options, &$join_conds, $opts ]
1399                 );
1400         }
1401
1402         /**
1403          * Return a IDatabase object for reading
1404          *
1405          * @return IDatabase
1406          */
1407         protected function getDB() {
1408                 return wfGetDB( DB_REPLICA );
1409         }
1410
1411         /**
1412          * Send output to the OutputPage object, only called if not used feeds
1413          *
1414          * @param ResultWrapper $rows Database rows
1415          * @param FormOptions $opts
1416          */
1417         public function webOutput( $rows, $opts ) {
1418                 if ( !$this->including() ) {
1419                         $this->outputFeedLinks();
1420                         $this->doHeader( $opts, $rows->numRows() );
1421                 }
1422
1423                 $this->outputChangesList( $rows, $opts );
1424         }
1425
1426         /**
1427          * Output feed links.
1428          */
1429         public function outputFeedLinks() {
1430                 // nothing by default
1431         }
1432
1433         /**
1434          * Build and output the actual changes list.
1435          *
1436          * @param ResultWrapper $rows Database rows
1437          * @param FormOptions $opts
1438          */
1439         abstract public function outputChangesList( $rows, $opts );
1440
1441         /**
1442          * Set the text to be displayed above the changes
1443          *
1444          * @param FormOptions $opts
1445          * @param int $numRows Number of rows in the result to show after this header
1446          */
1447         public function doHeader( $opts, $numRows ) {
1448                 $this->setTopText( $opts );
1449
1450                 // @todo Lots of stuff should be done here.
1451
1452                 $this->setBottomText( $opts );
1453         }
1454
1455         /**
1456          * Send the text to be displayed before the options. Should use $this->getOutput()->addWikiText()
1457          * or similar methods to print the text.
1458          *
1459          * @param FormOptions $opts
1460          */
1461         public function setTopText( FormOptions $opts ) {
1462                 // nothing by default
1463         }
1464
1465         /**
1466          * Send the text to be displayed after the options. Should use $this->getOutput()->addWikiText()
1467          * or similar methods to print the text.
1468          *
1469          * @param FormOptions $opts
1470          */
1471         public function setBottomText( FormOptions $opts ) {
1472                 // nothing by default
1473         }
1474
1475         /**
1476          * Get options to be displayed in a form
1477          * @todo This should handle options returned by getDefaultOptions().
1478          * @todo Not called by anything in this class (but is in subclasses), should be
1479          * called by something… doHeader() maybe?
1480          *
1481          * @param FormOptions $opts
1482          * @return array
1483          */
1484         public function getExtraOptions( $opts ) {
1485                 return [];
1486         }
1487
1488         /**
1489          * Return the legend displayed within the fieldset
1490          *
1491          * @return string
1492          */
1493         public function makeLegend() {
1494                 $context = $this->getContext();
1495                 $user = $context->getUser();
1496                 # The legend showing what the letters and stuff mean
1497                 $legend = Html::openElement( 'dl' ) . "\n";
1498                 # Iterates through them and gets the messages for both letter and tooltip
1499                 $legendItems = $context->getConfig()->get( 'RecentChangesFlags' );
1500                 if ( !( $user->useRCPatrol() || $user->useNPPatrol() ) ) {
1501                         unset( $legendItems['unpatrolled'] );
1502                 }
1503                 foreach ( $legendItems as $key => $item ) { # generate items of the legend
1504                         $label = isset( $item['legend'] ) ? $item['legend'] : $item['title'];
1505                         $letter = $item['letter'];
1506                         $cssClass = isset( $item['class'] ) ? $item['class'] : $key;
1507
1508                         $legend .= Html::element( 'dt',
1509                                 [ 'class' => $cssClass ], $context->msg( $letter )->text()
1510                         ) . "\n" .
1511                         Html::rawElement( 'dd',
1512                                 [ 'class' => Sanitizer::escapeClass( 'mw-changeslist-legend-' . $key ) ],
1513                                 $context->msg( $label )->parse()
1514                         ) . "\n";
1515                 }
1516                 # (+-123)
1517                 $legend .= Html::rawElement( 'dt',
1518                         [ 'class' => 'mw-plusminus-pos' ],
1519                         $context->msg( 'recentchanges-legend-plusminus' )->parse()
1520                 ) . "\n";
1521                 $legend .= Html::element(
1522                         'dd',
1523                         [ 'class' => 'mw-changeslist-legend-plusminus' ],
1524                         $context->msg( 'recentchanges-label-plusminus' )->text()
1525                 ) . "\n";
1526                 $legend .= Html::closeElement( 'dl' ) . "\n";
1527
1528                 $legendHeading = $this->isStructuredFilterUiEnabled() ?
1529                         $context->msg( 'rcfilters-legend-heading' )->parse() :
1530                         $context->msg( 'recentchanges-legend-heading' )->parse();
1531
1532                 # Collapsible
1533                 $collapsedState = $this->getRequest()->getCookie( 'changeslist-state' );
1534                 $collapsedClass = $collapsedState === 'collapsed' ? ' mw-collapsed' : '';
1535                 $legend =
1536                         '<div class="mw-changeslist-legend mw-collapsible' . $collapsedClass . '">' .
1537                                 $legendHeading .
1538                                 '<div class="mw-collapsible-content">' . $legend . '</div>' .
1539                         '</div>';
1540
1541                 return $legend;
1542         }
1543
1544         /**
1545          * Add page-specific modules.
1546          */
1547         protected function addModules() {
1548                 $out = $this->getOutput();
1549                 // Styles and behavior for the legend box (see makeLegend())
1550                 $out->addModuleStyles( [
1551                         'mediawiki.special.changeslist.legend',
1552                         'mediawiki.special.changeslist',
1553                 ] );
1554                 $out->addModules( 'mediawiki.special.changeslist.legend.js' );
1555
1556                 if ( $this->isStructuredFilterUiEnabled() ) {
1557                         $out->addModules( 'mediawiki.rcfilters.filters.ui' );
1558                         $out->addModuleStyles( 'mediawiki.rcfilters.filters.base.styles' );
1559                 }
1560         }
1561
1562         protected function getGroupName() {
1563                 return 'changes';
1564         }
1565
1566         /**
1567          * Filter on users' experience levels; this will not be called if nothing is
1568          * selected.
1569          *
1570          * @param string $specialPageClassName Class name of current special page
1571          * @param IContextSource $context Context, for e.g. user
1572          * @param IDatabase $dbr Database, for addQuotes, makeList, and similar
1573          * @param array &$tables Array of tables; see IDatabase::select $table
1574          * @param array &$fields Array of fields; see IDatabase::select $vars
1575          * @param array &$conds Array of conditions; see IDatabase::select $conds
1576          * @param array &$query_options Array of query options; see IDatabase::select $options
1577          * @param array &$join_conds Array of join conditions; see IDatabase::select $join_conds
1578          * @param array $selectedExpLevels The allowed active values, sorted
1579          * @param int $now Number of seconds since the UNIX epoch, or 0 if not given
1580          *   (optional)
1581          */
1582         public function filterOnUserExperienceLevel( $specialPageClassName, $context, $dbr,
1583                 &$tables, &$fields, &$conds, &$query_options, &$join_conds, $selectedExpLevels, $now = 0
1584         ) {
1585                 global $wgLearnerEdits,
1586                         $wgExperiencedUserEdits,
1587                         $wgLearnerMemberSince,
1588                         $wgExperiencedUserMemberSince;
1589
1590                 $LEVEL_COUNT = 5;
1591
1592                 // If all levels are selected, don't filter
1593                 if ( count( $selectedExpLevels ) === $LEVEL_COUNT ) {
1594                         return;
1595                 }
1596
1597                 // both 'registered' and 'unregistered', experience levels, if any, are included in 'registered'
1598                 if (
1599                         in_array( 'registered', $selectedExpLevels ) &&
1600                         in_array( 'unregistered', $selectedExpLevels )
1601                 ) {
1602                         return;
1603                 }
1604
1605                 // 'registered' but not 'unregistered', experience levels, if any, are included in 'registered'
1606                 if (
1607                         in_array( 'registered', $selectedExpLevels ) &&
1608                         !in_array( 'unregistered', $selectedExpLevels )
1609                 ) {
1610                         $conds[] = 'rc_user != 0';
1611                         return;
1612                 }
1613
1614                 if ( $selectedExpLevels === [ 'unregistered' ] ) {
1615                         $conds[] = 'rc_user = 0';
1616                         return;
1617                 }
1618
1619                 $tables[] = 'user';
1620                 $join_conds['user'] = [ 'LEFT JOIN', 'rc_user = user_id' ];
1621
1622                 if ( $now === 0 ) {
1623                         $now = time();
1624                 }
1625                 $secondsPerDay = 86400;
1626                 $learnerCutoff = $now - $wgLearnerMemberSince * $secondsPerDay;
1627                 $experiencedUserCutoff = $now - $wgExperiencedUserMemberSince * $secondsPerDay;
1628
1629                 $aboveNewcomer = $dbr->makeList(
1630                         [
1631                                 'user_editcount >= ' . intval( $wgLearnerEdits ),
1632                                 'user_registration <= ' . $dbr->addQuotes( $dbr->timestamp( $learnerCutoff ) ),
1633                         ],
1634                         IDatabase::LIST_AND
1635                 );
1636
1637                 $aboveLearner = $dbr->makeList(
1638                         [
1639                                 'user_editcount >= ' . intval( $wgExperiencedUserEdits ),
1640                                 'user_registration <= ' .
1641                                         $dbr->addQuotes( $dbr->timestamp( $experiencedUserCutoff ) ),
1642                         ],
1643                         IDatabase::LIST_AND
1644                 );
1645
1646                 $conditions = [];
1647
1648                 if ( in_array( 'unregistered', $selectedExpLevels ) ) {
1649                         $selectedExpLevels = array_diff( $selectedExpLevels, [ 'unregistered' ] );
1650                         $conditions[] = 'rc_user = 0';
1651                 }
1652
1653                 if ( $selectedExpLevels === [ 'newcomer' ] ) {
1654                         $conditions[] = "NOT ( $aboveNewcomer )";
1655                 } elseif ( $selectedExpLevels === [ 'learner' ] ) {
1656                         $conditions[] = $dbr->makeList(
1657                                 [ $aboveNewcomer, "NOT ( $aboveLearner )" ],
1658                                 IDatabase::LIST_AND
1659                         );
1660                 } elseif ( $selectedExpLevels === [ 'experienced' ] ) {
1661                         $conditions[] = $aboveLearner;
1662                 } elseif ( $selectedExpLevels === [ 'learner', 'newcomer' ] ) {
1663                         $conditions[] = "NOT ( $aboveLearner )";
1664                 } elseif ( $selectedExpLevels === [ 'experienced', 'newcomer' ] ) {
1665                         $conditions[] = $dbr->makeList(
1666                                 [ "NOT ( $aboveNewcomer )", $aboveLearner ],
1667                                 IDatabase::LIST_OR
1668                         );
1669                 } elseif ( $selectedExpLevels === [ 'experienced', 'learner' ] ) {
1670                         $conditions[] = $aboveNewcomer;
1671                 } elseif ( $selectedExpLevels === [ 'experienced', 'learner', 'newcomer' ] ) {
1672                         $conditions[] = 'rc_user != 0';
1673                 }
1674
1675                 if ( count( $conditions ) > 1 ) {
1676                         $conds[] = $dbr->makeList( $conditions, IDatabase::LIST_OR );
1677                 } elseif ( count( $conditions ) === 1 ) {
1678                         $conds[] = reset( $conditions );
1679                 }
1680         }
1681
1682         /**
1683          * Check whether the structured filter UI is enabled
1684          *
1685          * @return bool
1686          */
1687         public function isStructuredFilterUiEnabled() {
1688                 if ( $this->getRequest()->getBool( 'rcfilters' ) ) {
1689                         return true;
1690                 }
1691
1692                 if ( $this->getConfig()->get( 'StructuredChangeFiltersShowPreference' ) ) {
1693                         return !$this->getUser()->getOption( 'rcenhancedfilters-disable' );
1694                 } else {
1695                         return $this->getUser()->getOption( 'rcenhancedfilters' );
1696                 }
1697         }
1698
1699         /**
1700          * Check whether the structured filter UI is enabled by default (regardless of
1701          * this particular user's setting)
1702          *
1703          * @return bool
1704          */
1705         public function isStructuredFilterUiEnabledByDefault() {
1706                 if ( $this->getConfig()->get( 'StructuredChangeFiltersShowPreference' ) ) {
1707                         return !$this->getUser()->getDefaultOption( 'rcenhancedfilters-disable' );
1708                 } else {
1709                         return $this->getUser()->getDefaultOption( 'rcenhancedfilters' );
1710                 }
1711         }
1712
1713         abstract function getDefaultLimit();
1714
1715         /**
1716          * Get the default value of the number of days to display when loading
1717          * the result set.
1718          * Supports fractional values, and should be cast to a float.
1719          *
1720          * @return float
1721          */
1722         abstract function getDefaultDays();
1723 }