includes/WatchedItemQueryService.php

   1 <?php
   2
   3 use MediaWiki\Linker\LinkTarget;
   4 use Wikimedia\Assert\Assert;
   5
   6 /**
   7  * Class performing complex database queries related to WatchedItems.
   8  *
   9  * @since 1.28
  10  *
  11  * @file
  12  * @ingroup Watchlist
  13  *
  14  * @license GNU GPL v2+
  15  */
  16 class WatchedItemQueryService {
  17
  18         const DIR_OLDER = 'older';
  19         const DIR_NEWER = 'newer';
  20
  21         const INCLUDE_FLAGS = 'flags';
  22         const INCLUDE_USER = 'user';
  23         const INCLUDE_USER_ID = 'userid';
  24         const INCLUDE_COMMENT = 'comment';
  25         const INCLUDE_PATROL_INFO = 'patrol';
  26         const INCLUDE_SIZES = 'sizes';
  27         const INCLUDE_LOG_INFO = 'loginfo';
  28
  29         // FILTER_* constants are part of public API (are used in ApiQueryWatchlist and
  30         // ApiQueryWatchlistRaw classes) and should not be changed.
  31         // Changing values of those constants will result in a breaking change in the API
  32         const FILTER_MINOR = 'minor';
  33         const FILTER_NOT_MINOR = '!minor';
  34         const FILTER_BOT = 'bot';
  35         const FILTER_NOT_BOT = '!bot';
  36         const FILTER_ANON = 'anon';
  37         const FILTER_NOT_ANON = '!anon';
  38         const FILTER_PATROLLED = 'patrolled';
  39         const FILTER_NOT_PATROLLED = '!patrolled';
  40         const FILTER_UNREAD = 'unread';
  41         const FILTER_NOT_UNREAD = '!unread';
  42         const FILTER_CHANGED = 'changed';
  43         const FILTER_NOT_CHANGED = '!changed';
  44
  45         const SORT_ASC = 'ASC';
  46         const SORT_DESC = 'DESC';
  47
  48         /**
  49          * @var LoadBalancer
  50          */
  51         private $loadBalancer;
  52
  53         public function __construct( LoadBalancer $loadBalancer ) {
  54                 $this->loadBalancer = $loadBalancer;
  55         }
  56
  57         /**
  58          * @return IDatabase
  59          * @throws MWException
  60          */
  61         private function getConnection() {
  62                 return $this->loadBalancer->getConnectionRef( DB_REPLICA, [ 'watchlist' ] );
  63         }
  64
  65         /**
  66          * @param User $user
  67          * @param array $options Allowed keys:
  68          *        'includeFields'       => string[] RecentChange fields to be included in the result,
  69          *                                 self::INCLUDE_* constants should be used
  70          *        'filters'             => string[] optional filters to narrow down resulted items
  71          *        'namespaceIds'        => int[] optional namespace IDs to filter by
  72          *                                 (defaults to all namespaces)
  73          *        'allRevisions'        => bool return multiple revisions of the same page if true,
  74          *                                 only the most recent if false (default)
  75          *        'rcTypes'             => int[] which types of RecentChanges to include
  76          *                                 (defaults to all types), allowed values: RC_EDIT, RC_NEW,
  77          *                                 RC_LOG, RC_EXTERNAL, RC_CATEGORIZE
  78          *        'onlyByUser'          => string only list changes by a specified user
  79          *        'notByUser'           => string do not incluide changes by a specified user
  80          *        'dir'                 => string in which direction to enumerate, accepted values:
  81          *                                 - DIR_OLDER list newest first
  82          *                                 - DIR_NEWER list oldest first
  83          *        'start'               => string (format accepted by wfTimestamp) requires 'dir' option,
  84          *                                 timestamp to start enumerating from
  85          *        'end'                 => string (format accepted by wfTimestamp) requires 'dir' option,
  86          *                                 timestamp to end enumerating
  87          *        'startFrom'           => [ string $rcTimestamp, int $rcId ] requires 'dir' option,
  88          *                                 return items starting from the RecentChange specified by this,
  89          *                                 $rcTimestamp should be in the format accepted by wfTimestamp
  90          *        'watchlistOwner'      => User user whose watchlist items should be listed if different
  91          *                                 than the one specified with $user param,
  92          *                                 requires 'watchlistOwnerToken' option
  93          *        'watchlistOwnerToken' => string a watchlist token used to access another user's
  94          *                                 watchlist, used with 'watchlistOwnerToken' option
  95          *        'limit'               => int maximum numbers of items to return
  96          *        'usedInGenerator'     => bool include only RecentChange id field required by the
  97          *                                 generator ('rc_cur_id' or 'rc_this_oldid') if true, or all
  98          *                                 id fields ('rc_cur_id', 'rc_this_oldid', 'rc_last_oldid')
  99          *                                 if false (default)
 100          * @return array of pairs ( WatchedItem $watchedItem, string[] $recentChangeInfo ),
 101          *         where $recentChangeInfo contains the following keys:
 102          *         - 'rc_id',
 103          *         - 'rc_namespace',
 104          *         - 'rc_title',
 105          *         - 'rc_timestamp',
 106          *         - 'rc_type',
 107          *         - 'rc_deleted',
 108          *         Additional keys could be added by specifying the 'includeFields' option
 109          */
 110         public function getWatchedItemsWithRecentChangeInfo( User $user, array $options = [] ) {
 111                 $options += [
 112                         'includeFields' => [],
 113                         'namespaceIds' => [],
 114                         'filters' => [],
 115                         'allRevisions' => false,
 116                         'usedInGenerator' => false
 117                 ];
 118
 119                 Assert::parameter(
 120                         !isset( $options['rcTypes'] )
 121                                 || !array_diff( $options['rcTypes'], [ RC_EDIT, RC_NEW, RC_LOG, RC_EXTERNAL, RC_CATEGORIZE ] ),
 122                         '$options[\'rcTypes\']',
 123                         'must be an array containing only: RC_EDIT, RC_NEW, RC_LOG, RC_EXTERNAL and/or RC_CATEGORIZE'
 124                 );
 125                 Assert::parameter(
 126                         !isset( $options['dir'] ) || in_array( $options['dir'], [ self::DIR_OLDER, self::DIR_NEWER ] ),
 127                         '$options[\'dir\']',
 128                         'must be DIR_OLDER or DIR_NEWER'
 129                 );
 130                 Assert::parameter(
 131                         !isset( $options['start'] ) && !isset( $options['end'] ) && !isset( $options['startFrom'] )
 132                                 || isset( $options['dir'] ),
 133                         '$options[\'dir\']',
 134                         'must be provided when providing any of options: start, end, startFrom'
 135                 );
 136                 Assert::parameter(
 137                         !isset( $options['startFrom'] )
 138                                 || ( is_array( $options['startFrom'] ) && count( $options['startFrom'] ) === 2 ),
 139                         '$options[\'startFrom\']',
 140                         'must be a two-element array'
 141                 );
 142                 if ( array_key_exists( 'watchlistOwner', $options ) ) {
 143                         Assert::parameterType(
 144                                 User::class,
 145                                 $options['watchlistOwner'],
 146                                 '$options[\'watchlistOwner\']'
 147                         );
 148                         Assert::parameter(
 149                                 isset( $options['watchlistOwnerToken'] ),
 150                                 '$options[\'watchlistOwnerToken\']',
 151                                 'must be provided when providing watchlistOwner option'
 152                         );
 153                 }
 154
 155                 $tables = [ 'recentchanges', 'watchlist' ];
 156                 if ( !$options['allRevisions'] ) {
 157                         $tables[] = 'page';
 158                 }
 159
 160                 $db = $this->getConnection();
 161
 162                 $fields = $this->getWatchedItemsWithRCInfoQueryFields( $options );
 163                 $conds = $this->getWatchedItemsWithRCInfoQueryConds( $db, $user, $options );
 164                 $dbOptions = $this->getWatchedItemsWithRCInfoQueryDbOptions( $options );
 165                 $joinConds = $this->getWatchedItemsWithRCInfoQueryJoinConds( $options );
 166
 167                 $res = $db->select(
 168                         $tables,
 169                         $fields,
 170                         $conds,
 171                         __METHOD__,
 172                         $dbOptions,
 173                         $joinConds
 174                 );
 175
 176                 $items = [];
 177                 foreach ( $res as $row ) {
 178                         $items[] = [
 179                                 new WatchedItem(
 180                                         $user,
 181                                         new TitleValue( (int)$row->rc_namespace, $row->rc_title ),
 182                                         $row->wl_notificationtimestamp
 183                                 ),
 184                                 $this->getRecentChangeFieldsFromRow( $row )
 185                         ];
 186                 }
 187
 188                 return $items;
 189         }
 190
 191         /**
 192          * For simple listing of user's watchlist items, see WatchedItemStore::getWatchedItemsForUser
 193          *
 194          * @param User $user
 195          * @param array $options Allowed keys:
 196          *        'sort'         => string optional sorting by namespace ID and title
 197          *                          one of the self::SORT_* constants
 198          *        'namespaceIds' => int[] optional namespace IDs to filter by (defaults to all namespaces)
 199          *        'limit'        => int maximum number of items to return
 200          *        'filter'       => string optional filter, one of the self::FILTER_* contants
 201          *        'from'         => LinkTarget requires 'sort' key, only return items starting from
 202          *                          those related to the link target
 203          *        'until'        => LinkTarget requires 'sort' key, only return items until
 204          *                          those related to the link target
 205          *        'startFrom'    => LinkTarget requires 'sort' key, only return items starting from
 206          *                          those related to the link target, allows to skip some link targets
 207          *                          specified using the form option
 208          * @return WatchedItem[]
 209          */
 210         public function getWatchedItemsForUser( User $user, array $options = [] ) {
 211                 if ( $user->isAnon() ) {
 212                         // TODO: should this just return an empty array or rather complain loud at this point
 213                         // as e.g. ApiBase::getWatchlistUser does?
 214                         return [];
 215                 }
 216
 217                 $options += [ 'namespaceIds' => [] ];
 218
 219                 Assert::parameter(
 220                         !isset( $options['sort'] ) || in_array( $options['sort'], [ self::SORT_ASC, self::SORT_DESC ] ),
 221                         '$options[\'sort\']',
 222                         'must be SORT_ASC or SORT_DESC'
 223                 );
 224                 Assert::parameter(
 225                         !isset( $options['filter'] ) || in_array(
 226                                 $options['filter'], [ self::FILTER_CHANGED, self::FILTER_NOT_CHANGED ]
 227                         ),
 228                         '$options[\'filter\']',
 229                         'must be FILTER_CHANGED or FILTER_NOT_CHANGED'
 230                 );
 231                 Assert::parameter(
 232                         !isset( $options['from'] ) && !isset( $options['until'] ) && !isset( $options['startFrom'] )
 233                         || isset( $options['sort'] ),
 234                         '$options[\'sort\']',
 235                         'must be provided if any of "from", "until", "startFrom" options is provided'
 236                 );
 237
 238                 $db = $this->getConnection();
 239
 240                 $conds = $this->getWatchedItemsForUserQueryConds( $db, $user, $options );
 241                 $dbOptions = $this->getWatchedItemsForUserQueryDbOptions( $options );
 242
 243                 $res = $db->select(
 244                         'watchlist',
 245                         [ 'wl_namespace', 'wl_title', 'wl_notificationtimestamp' ],
 246                         $conds,
 247                         __METHOD__,
 248                         $dbOptions
 249                 );
 250
 251                 $watchedItems = [];
 252                 foreach ( $res as $row ) {
 253                         // todo these could all be cached at some point?
 254                         $watchedItems[] = new WatchedItem(
 255                                 $user,
 256                                 new TitleValue( (int)$row->wl_namespace, $row->wl_title ),
 257                                 $row->wl_notificationtimestamp
 258                         );
 259                 }
 260
 261                 return $watchedItems;
 262         }
 263
 264         private function getRecentChangeFieldsFromRow( stdClass $row ) {
 265                 // This can be simplified to single array_filter call filtering by key value,
 266                 // once we stop supporting PHP 5.5
 267                 $allFields = get_object_vars( $row );
 268                 $rcKeys = array_filter(
 269                         array_keys( $allFields ),
 270                         function( $key ) {
 271                                 return substr( $key, 0, 3 ) === 'rc_';
 272                         }
 273                 );
 274                 return array_intersect_key( $allFields, array_flip( $rcKeys ) );
 275         }
 276
 277         private function getWatchedItemsWithRCInfoQueryFields( array $options ) {
 278                 $fields = [
 279                         'rc_id',
 280                         'rc_namespace',
 281                         'rc_title',
 282                         'rc_timestamp',
 283                         'rc_type',
 284                         'rc_deleted',
 285                         'wl_notificationtimestamp'
 286                 ];
 287
 288                 $rcIdFields = [
 289                         'rc_cur_id',
 290                         'rc_this_oldid',
 291                         'rc_last_oldid',
 292                 ];
 293                 if ( $options['usedInGenerator'] ) {
 294                         if ( $options['allRevisions'] ) {
 295                                 $rcIdFields = [ 'rc_this_oldid' ];
 296                         } else {
 297                                 $rcIdFields = [ 'rc_cur_id' ];
 298                         }
 299                 }
 300                 $fields = array_merge( $fields, $rcIdFields );
 301
 302                 if ( in_array( self::INCLUDE_FLAGS, $options['includeFields'] ) ) {
 303                         $fields = array_merge( $fields, [ 'rc_type', 'rc_minor', 'rc_bot' ] );
 304                 }
 305                 if ( in_array( self::INCLUDE_USER, $options['includeFields'] ) ) {
 306                         $fields[] = 'rc_user_text';
 307                 }
 308                 if ( in_array( self::INCLUDE_USER_ID, $options['includeFields'] ) ) {
 309                         $fields[] = 'rc_user';
 310                 }
 311                 if ( in_array( self::INCLUDE_COMMENT, $options['includeFields'] ) ) {
 312                         $fields[] = 'rc_comment';
 313                 }
 314                 if ( in_array( self::INCLUDE_PATROL_INFO, $options['includeFields'] ) ) {
 315                         $fields = array_merge( $fields, [ 'rc_patrolled', 'rc_log_type' ] );
 316                 }
 317                 if ( in_array( self::INCLUDE_SIZES, $options['includeFields'] ) ) {
 318                         $fields = array_merge( $fields, [ 'rc_old_len', 'rc_new_len' ] );
 319                 }
 320                 if ( in_array( self::INCLUDE_LOG_INFO, $options['includeFields'] ) ) {
 321                         $fields = array_merge( $fields, [ 'rc_logid', 'rc_log_type', 'rc_log_action', 'rc_params' ] );
 322                 }
 323
 324                 return $fields;
 325         }
 326
 327         private function getWatchedItemsWithRCInfoQueryConds(
 328                 IDatabase $db,
 329                 User $user,
 330                 array $options
 331         ) {
 332                 $watchlistOwnerId = $this->getWatchlistOwnerId( $user, $options );
 333                 $conds = [ 'wl_user' => $watchlistOwnerId ];
 334
 335                 if ( !$options['allRevisions'] ) {
 336                         $conds[] = $db->makeList(
 337                                 [ 'rc_this_oldid=page_latest', 'rc_type=' . RC_LOG ],
 338                                 LIST_OR
 339                         );
 340                 }
 341
 342                 if ( $options['namespaceIds'] ) {
 343                         $conds['wl_namespace'] = array_map( 'intval', $options['namespaceIds'] );
 344                 }
 345
 346                 if ( array_key_exists( 'rcTypes', $options ) ) {
 347                         $conds['rc_type'] = array_map( 'intval',  $options['rcTypes'] );
 348                 }
 349
 350                 $conds = array_merge(
 351                         $conds,
 352                         $this->getWatchedItemsWithRCInfoQueryFilterConds( $user, $options )
 353                 );
 354
 355                 $conds = array_merge( $conds, $this->getStartEndConds( $db, $options ) );
 356
 357                 if ( !isset( $options['start'] ) && !isset( $options['end'] ) ) {
 358                         if ( $db->getType() === 'mysql' ) {
 359                                 // This is an index optimization for mysql
 360                                 $conds[] = "rc_timestamp > ''";
 361                         }
 362                 }
 363
 364                 $conds = array_merge( $conds, $this->getUserRelatedConds( $db, $user, $options ) );
 365
 366                 $deletedPageLogCond = $this->getExtraDeletedPageLogEntryRelatedCond( $db, $user );
 367                 if ( $deletedPageLogCond ) {
 368                         $conds[] = $deletedPageLogCond;
 369                 }
 370
 371                 if ( array_key_exists( 'startFrom', $options ) ) {
 372                         $conds[] = $this->getStartFromConds( $db, $options );
 373                 }
 374
 375                 return $conds;
 376         }
 377
 378         private function getWatchlistOwnerId( User $user, array $options ) {
 379                 if ( array_key_exists( 'watchlistOwner', $options ) ) {
 380                         /** @var User $watchlistOwner */
 381                         $watchlistOwner = $options['watchlistOwner'];
 382                         $ownersToken = $watchlistOwner->getOption( 'watchlisttoken' );
 383                         $token = $options['watchlistOwnerToken'];
 384                         if ( $ownersToken == '' || !hash_equals( $ownersToken, $token ) ) {
 385                                 throw new UsageException(
 386                                         'Incorrect watchlist token provided -- please set a correct token in Special:Preferences',
 387                                         'bad_wltoken'
 388                                 );
 389                         }
 390                         return $watchlistOwner->getId();
 391                 }
 392                 return $user->getId();
 393         }
 394
 395         private function getWatchedItemsWithRCInfoQueryFilterConds( User $user, array $options ) {
 396                 $conds = [];
 397
 398                 if ( in_array( self::FILTER_MINOR, $options['filters'] ) ) {
 399                         $conds[] = 'rc_minor != 0';
 400                 } elseif ( in_array( self::FILTER_NOT_MINOR, $options['filters'] ) ) {
 401                         $conds[] = 'rc_minor = 0';
 402                 }
 403
 404                 if ( in_array( self::FILTER_BOT, $options['filters'] ) ) {
 405                         $conds[] = 'rc_bot != 0';
 406                 } elseif ( in_array( self::FILTER_NOT_BOT, $options['filters'] ) ) {
 407                         $conds[] = 'rc_bot = 0';
 408                 }
 409
 410                 if ( in_array( self::FILTER_ANON, $options['filters'] ) ) {
 411                         $conds[] = 'rc_user = 0';
 412                 } elseif ( in_array( self::FILTER_NOT_ANON, $options['filters'] ) ) {
 413                         $conds[] = 'rc_user != 0';
 414                 }
 415
 416                 if ( $user->useRCPatrol() || $user->useNPPatrol() ) {
 417                         // TODO: not sure if this should simply ignore patrolled filters if user does not have the patrol
 418                         // right, or maybe rather fail loud at this point, same as e.g. ApiQueryWatchlist does?
 419                         if ( in_array( self::FILTER_PATROLLED, $options['filters'] ) ) {
 420                                 $conds[] = 'rc_patrolled != 0';
 421                         } elseif ( in_array( self::FILTER_NOT_PATROLLED, $options['filters'] ) ) {
 422                                 $conds[] = 'rc_patrolled = 0';
 423                         }
 424                 }
 425
 426                 if ( in_array( self::FILTER_UNREAD, $options['filters'] ) ) {
 427                         $conds[] = 'rc_timestamp >= wl_notificationtimestamp';
 428                 } elseif ( in_array( self::FILTER_NOT_UNREAD, $options['filters'] ) ) {
 429                         // TODO: should this be changed to use Database::makeList?
 430                         $conds[] = 'wl_notificationtimestamp IS NULL OR rc_timestamp < wl_notificationtimestamp';
 431                 }
 432
 433                 return $conds;
 434         }
 435
 436         private function getStartEndConds( IDatabase $db, array $options ) {
 437                 if ( !isset( $options['start'] ) && ! isset( $options['end'] ) ) {
 438                         return [];
 439                 }
 440
 441                 $conds = [];
 442
 443                 if ( isset( $options['start'] ) ) {
 444                         $after = $options['dir'] === self::DIR_OLDER ? '<=' : '>=';
 445                         $conds[] = 'rc_timestamp ' . $after . ' ' . $db->addQuotes( $options['start'] );
 446                 }
 447                 if ( isset( $options['end'] ) ) {
 448                         $before = $options['dir'] === self::DIR_OLDER ? '>=' : '<=';
 449                         $conds[] = 'rc_timestamp ' . $before . ' ' . $db->addQuotes( $options['end'] );
 450                 }
 451
 452                 return $conds;
 453         }
 454
 455         private function getUserRelatedConds( IDatabase $db, User $user, array $options ) {
 456                 if ( !array_key_exists( 'onlyByUser', $options ) && !array_key_exists( 'notByUser', $options ) ) {
 457                         return [];
 458                 }
 459
 460                 $conds = [];
 461
 462                 if ( array_key_exists( 'onlyByUser', $options ) ) {
 463                         $conds['rc_user_text'] = $options['onlyByUser'];
 464                 } elseif ( array_key_exists( 'notByUser', $options ) ) {
 465                         $conds[] = 'rc_user_text != ' . $db->addQuotes( $options['notByUser'] );
 466                 }
 467
 468                 // Avoid brute force searches (bug 17342)
 469                 $bitmask = 0;
 470                 if ( !$user->isAllowed( 'deletedhistory' ) ) {
 471                         $bitmask = Revision::DELETED_USER;
 472                 } elseif ( !$user->isAllowedAny( 'suppressrevision', 'viewsuppressed' ) ) {
 473                         $bitmask = Revision::DELETED_USER | Revision::DELETED_RESTRICTED;
 474                 }
 475                 if ( $bitmask ) {
 476                         $conds[] = $db->bitAnd( 'rc_deleted', $bitmask ) . " != $bitmask";
 477                 }
 478
 479                 return $conds;
 480         }
 481
 482         private function getExtraDeletedPageLogEntryRelatedCond( IDatabase $db, User $user ) {
 483                 // LogPage::DELETED_ACTION hides the affected page, too. So hide those
 484                 // entirely from the watchlist, or someone could guess the title.
 485                 $bitmask = 0;
 486                 if ( !$user->isAllowed( 'deletedhistory' ) ) {
 487                         $bitmask = LogPage::DELETED_ACTION;
 488                 } elseif ( !$user->isAllowedAny( 'suppressrevision', 'viewsuppressed' ) ) {
 489                         $bitmask = LogPage::DELETED_ACTION | LogPage::DELETED_RESTRICTED;
 490                 }
 491                 if ( $bitmask ) {
 492                         return $db->makeList( [
 493                                 'rc_type != ' . RC_LOG,
 494                                 $db->bitAnd( 'rc_deleted', $bitmask ) . " != $bitmask",
 495                         ], LIST_OR );
 496                 }
 497                 return '';
 498         }
 499
 500         private function getStartFromConds( IDatabase $db, array $options ) {
 501                 $op = $options['dir'] === self::DIR_OLDER ? '<' : '>';
 502                 list( $rcTimestamp, $rcId ) = $options['startFrom'];
 503                 $rcTimestamp = $db->addQuotes( $db->timestamp( $rcTimestamp ) );
 504                 $rcId = (int)$rcId;
 505                 return $db->makeList(
 506                         [
 507                                 "rc_timestamp $op $rcTimestamp",
 508                                 $db->makeList(
 509                                         [
 510                                                 "rc_timestamp = $rcTimestamp",
 511                                                 "rc_id $op= $rcId"
 512                                         ],
 513                                         LIST_AND
 514                                 )
 515                         ],
 516                         LIST_OR
 517                 );
 518         }
 519
 520         private function getWatchedItemsForUserQueryConds( IDatabase $db, User $user, array $options ) {
 521                 $conds = [ 'wl_user' => $user->getId() ];
 522                 if ( $options['namespaceIds'] ) {
 523                         $conds['wl_namespace'] = array_map( 'intval', $options['namespaceIds'] );
 524                 }
 525                 if ( isset( $options['filter'] ) ) {
 526                         $filter = $options['filter'];
 527                         if ( $filter ===  self::FILTER_CHANGED ) {
 528                                 $conds[] = 'wl_notificationtimestamp IS NOT NULL';
 529                         } else {
 530                                 $conds[] = 'wl_notificationtimestamp IS NULL';
 531                         }
 532                 }
 533
 534                 if ( isset( $options['from'] ) ) {
 535                         $op = $options['sort'] === self::SORT_ASC ? '>' : '<';
 536                         $conds[] = $this->getFromUntilTargetConds( $db, $options['from'], $op );
 537                 }
 538                 if ( isset( $options['until'] ) ) {
 539                         $op = $options['sort'] === self::SORT_ASC ? '<' : '>';
 540                         $conds[] = $this->getFromUntilTargetConds( $db, $options['until'], $op );
 541                 }
 542                 if ( isset( $options['startFrom'] ) ) {
 543                         $op = $options['sort'] === self::SORT_ASC ? '>' : '<';
 544                         $conds[] = $this->getFromUntilTargetConds( $db, $options['startFrom'], $op );
 545                 }
 546
 547                 return $conds;
 548         }
 549
 550         /**
 551          * Creates a query condition part for getting only items before or after the given link target
 552          * (while ordering using $sort mode)
 553          *
 554          * @param IDatabase $db
 555          * @param LinkTarget $target
 556          * @param string $op comparison operator to use in the conditions
 557          * @return string
 558          */
 559         private function getFromUntilTargetConds( IDatabase $db, LinkTarget $target, $op ) {
 560                 return $db->makeList(
 561                         [
 562                                 "wl_namespace $op " . $target->getNamespace(),
 563                                 $db->makeList(
 564                                         [
 565                                                 'wl_namespace = ' . $target->getNamespace(),
 566                                                 "wl_title $op= " . $db->addQuotes( $target->getDBkey() )
 567                                         ],
 568                                         LIST_AND
 569                                 )
 570                         ],
 571                         LIST_OR
 572                 );
 573         }
 574
 575         private function getWatchedItemsWithRCInfoQueryDbOptions( array $options ) {
 576                 $dbOptions = [];
 577
 578                 if ( array_key_exists( 'dir', $options ) ) {
 579                         $sort = $options['dir'] === self::DIR_OLDER ? ' DESC' : '';
 580                         $dbOptions['ORDER BY'] = [ 'rc_timestamp' . $sort, 'rc_id' . $sort ];
 581                 }
 582
 583                 if ( array_key_exists( 'limit', $options ) ) {
 584                         $dbOptions['LIMIT'] = (int)$options['limit'];
 585                 }
 586
 587                 return $dbOptions;
 588         }
 589
 590         private function getWatchedItemsForUserQueryDbOptions( array $options ) {
 591                 $dbOptions = [];
 592                 if ( array_key_exists( 'sort', $options ) ) {
 593                         $dbOptions['ORDER BY'] = [
 594                                 "wl_namespace {$options['sort']}",
 595                                 "wl_title {$options['sort']}"
 596                         ];
 597                         if ( count( $options['namespaceIds'] ) === 1 ) {
 598                                 $dbOptions['ORDER BY'] = "wl_title {$options['sort']}";
 599                         }
 600                 }
 601                 if ( array_key_exists( 'limit', $options ) ) {
 602                         $dbOptions['LIMIT'] = (int)$options['limit'];
 603                 }
 604                 return $dbOptions;
 605         }
 606
 607         private function getWatchedItemsWithRCInfoQueryJoinConds( array $options ) {
 608                 $joinConds = [
 609                         'watchlist' => [ 'INNER JOIN',
 610                                 [
 611                                         'wl_namespace=rc_namespace',
 612                                         'wl_title=rc_title'
 613                                 ]
 614                         ]
 615                 ];
 616                 if ( !$options['allRevisions'] ) {
 617                         $joinConds['page'] = [ 'LEFT JOIN', 'rc_cur_id=page_id' ];
 618                 }
 619                 return $joinConds;
 620         }
 621
 622 }