includes/RecentChange.php

   1 <?php
   2 /**
   3  * Utility class for creating and accessing recent change entries.
   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  */
  22
  23 /**
  24  * Utility class for creating new RC entries
  25  *
  26  * mAttribs:
  27  *  rc_id           id of the row in the recentchanges table
  28  *  rc_timestamp    time the entry was made
  29  *  rc_cur_time     timestamp on the cur row
  30  *  rc_namespace    namespace #
  31  *  rc_title        non-prefixed db key
  32  *  rc_type         is new entry, used to determine whether updating is necessary
  33  *  rc_minor        is minor
  34  *  rc_cur_id       page_id of associated page entry
  35  *  rc_user         user id who made the entry
  36  *  rc_user_text    user name who made the entry
  37  *  rc_comment      edit summary
  38  *  rc_this_oldid   rev_id associated with this entry (or zero)
  39  *  rc_last_oldid   rev_id associated with the entry before this one (or zero)
  40  *  rc_bot          is bot, hidden
  41  *  rc_ip           IP address of the user in dotted quad notation
  42  *  rc_new          obsolete, use rc_type==RC_NEW
  43  *  rc_patrolled    boolean whether or not someone has marked this edit as patrolled
  44  *  rc_old_len      integer byte length of the text before the edit
  45  *  rc_new_len      the same after the edit
  46  *  rc_deleted      partial deletion
  47  *  rc_logid        the log_id value for this log entry (or zero)
  48  *  rc_log_type     the log type (or null)
  49  *  rc_log_action   the log action (or null)
  50  *  rc_params       log params
  51  *
  52  * mExtra:
  53  *  prefixedDBkey   prefixed db key, used by external app via msg queue
  54  *  lastTimestamp   timestamp of previous entry, used in WHERE clause during update
  55  *  lang            the interwiki prefix, automatically set in save()
  56  *  oldSize         text size before the change
  57  *  newSize         text size after the change
  58  *  pageStatus      status of the page: created, deleted, moved, restored, changed
  59  *
  60  * temporary:       not stored in the database
  61  *      notificationtimestamp
  62  *      numberofWatchingusers
  63  *
  64  * @todo document functions and variables
  65  */
  66 class RecentChange {
  67         var $mAttribs = array(), $mExtra = array();
  68
  69         /**
  70          * @var Title
  71          */
  72         var $mTitle = false;
  73
  74         /**
  75          * @var User
  76          */
  77         private $mPerformer = false;
  78
  79         /**
  80          * @var Title
  81          */
  82         var $mMovedToTitle = false;
  83         var $numberofWatchingusers = 0; # Dummy to prevent error message in SpecialRecentchangeslinked
  84         var $notificationtimestamp;
  85
  86         # Factory methods
  87
  88         /**
  89          * @param $row
  90          * @return RecentChange
  91          */
  92         public static function newFromRow( $row ) {
  93                 $rc = new RecentChange;
  94                 $rc->loadFromRow( $row );
  95                 return $rc;
  96         }
  97
  98         /**
  99          * @deprecated in 1.22
 100          * @param $row
 101          * @return RecentChange
 102          */
 103         public static function newFromCurRow( $row ) {
 104                 wfDeprecated( __METHOD__, '1.22' );
 105                 $rc = new RecentChange;
 106                 $rc->loadFromCurRow( $row );
 107                 $rc->notificationtimestamp = false;
 108                 $rc->numberofWatchingusers = false;
 109                 return $rc;
 110         }
 111
 112         /**
 113          * Obtain the recent change with a given rc_id value
 114          *
 115          * @param int $rcid rc_id value to retrieve
 116          * @return RecentChange
 117          */
 118         public static function newFromId( $rcid ) {
 119                 return self::newFromConds( array( 'rc_id' => $rcid ), __METHOD__ );
 120         }
 121
 122         /**
 123          * Find the first recent change matching some specific conditions
 124          *
 125          * @param array $conds of conditions
 126          * @param $fname Mixed: override the method name in profiling/logs
 127          * @param $options Array Query options
 128          * @return RecentChange
 129          */
 130         public static function newFromConds( $conds, $fname = __METHOD__, $options = array() ) {
 131                 $dbr = wfGetDB( DB_SLAVE );
 132                 $row = $dbr->selectRow( 'recentchanges', self::selectFields(), $conds, $fname, $options );
 133                 if ( $row !== false ) {
 134                         return self::newFromRow( $row );
 135                 } else {
 136                         return null;
 137                 }
 138         }
 139
 140         /**
 141          * Return the list of recentchanges fields that should be selected to create
 142          * a new recentchanges object.
 143          * @return array
 144          */
 145         public static function selectFields() {
 146                 return array(
 147                         'rc_id',
 148                         'rc_timestamp',
 149                         'rc_cur_time',
 150                         'rc_user',
 151                         'rc_user_text',
 152                         'rc_namespace',
 153                         'rc_title',
 154                         'rc_comment',
 155                         'rc_minor',
 156                         'rc_bot',
 157                         'rc_new',
 158                         'rc_cur_id',
 159                         'rc_this_oldid',
 160                         'rc_last_oldid',
 161                         'rc_type',
 162                         'rc_patrolled',
 163                         'rc_ip',
 164                         'rc_old_len',
 165                         'rc_new_len',
 166                         'rc_deleted',
 167                         'rc_logid',
 168                         'rc_log_type',
 169                         'rc_log_action',
 170                         'rc_params',
 171                 );
 172         }
 173
 174         # Accessors
 175
 176         /**
 177          * @param $attribs array
 178          */
 179         public function setAttribs( $attribs ) {
 180                 $this->mAttribs = $attribs;
 181         }
 182
 183         /**
 184          * @param $extra array
 185          */
 186         public function setExtra( $extra ) {
 187                 $this->mExtra = $extra;
 188         }
 189
 190         /**
 191          *
 192          * @return Title
 193          */
 194         public function &getTitle() {
 195                 if ( $this->mTitle === false ) {
 196                         $this->mTitle = Title::makeTitle( $this->mAttribs['rc_namespace'], $this->mAttribs['rc_title'] );
 197                 }
 198                 return $this->mTitle;
 199         }
 200
 201         /**
 202          * Get the User object of the person who performed this change.
 203          *
 204          * @return User
 205          */
 206         public function getPerformer() {
 207                 if ( $this->mPerformer === false ) {
 208                         if ( $this->mAttribs['rc_user'] ) {
 209                                 $this->mPerformer = User::newFromID( $this->mAttribs['rc_user'] );
 210                         } else {
 211                                 $this->mPerformer = User::newFromName( $this->mAttribs['rc_user_text'], false );
 212                         }
 213                 }
 214                 return $this->mPerformer;
 215         }
 216
 217         /**
 218          * Writes the data in this object to the database
 219          * @param $noudp bool
 220          */
 221         public function save( $noudp = false ) {
 222                 global $wgLocalInterwiki, $wgPutIPinRC, $wgUseEnotif, $wgShowUpdatedMarker, $wgContLang;
 223
 224                 $dbw = wfGetDB( DB_MASTER );
 225                 if ( !is_array( $this->mExtra ) ) {
 226                         $this->mExtra = array();
 227                 }
 228                 $this->mExtra['lang'] = $wgLocalInterwiki;
 229
 230                 if ( !$wgPutIPinRC ) {
 231                         $this->mAttribs['rc_ip'] = '';
 232                 }
 233
 234                 # If our database is strict about IP addresses, use NULL instead of an empty string
 235                 if ( $dbw->strictIPs() and $this->mAttribs['rc_ip'] == '' ) {
 236                         unset( $this->mAttribs['rc_ip'] );
 237                 }
 238
 239                 # Trim spaces on user supplied text
 240                 $this->mAttribs['rc_comment'] = trim( $this->mAttribs['rc_comment'] );
 241
 242                 # Make sure summary is truncated (whole multibyte characters)
 243                 $this->mAttribs['rc_comment'] = $wgContLang->truncate( $this->mAttribs['rc_comment'], 255 );
 244
 245                 # Fixup database timestamps
 246                 $this->mAttribs['rc_timestamp'] = $dbw->timestamp( $this->mAttribs['rc_timestamp'] );
 247                 $this->mAttribs['rc_cur_time'] = $dbw->timestamp( $this->mAttribs['rc_cur_time'] );
 248                 $this->mAttribs['rc_id'] = $dbw->nextSequenceValue( 'recentchanges_rc_id_seq' );
 249
 250                 ## If we are using foreign keys, an entry of 0 for the page_id will fail, so use NULL
 251                 if ( $dbw->cascadingDeletes() and $this->mAttribs['rc_cur_id'] == 0 ) {
 252                         unset( $this->mAttribs['rc_cur_id'] );
 253                 }
 254
 255                 # Insert new row
 256                 $dbw->insert( 'recentchanges', $this->mAttribs, __METHOD__ );
 257
 258                 # Set the ID
 259                 $this->mAttribs['rc_id'] = $dbw->insertId();
 260
 261                 # Notify extensions
 262                 wfRunHooks( 'RecentChange_save', array( &$this ) );
 263
 264                 # Notify external application via UDP
 265                 if ( !$noudp ) {
 266                         $this->notifyRCFeeds();
 267                 }
 268
 269                 # E-mail notifications
 270                 if ( $wgUseEnotif || $wgShowUpdatedMarker ) {
 271                         $editor = $this->getPerformer();
 272                         $title = $this->getTitle();
 273
 274                         if ( wfRunHooks( 'AbortEmailNotification', array( $editor, $title ) ) ) {
 275                                 # @todo FIXME: This would be better as an extension hook
 276                                 $enotif = new EmailNotification();
 277                                 $enotif->notifyOnPageChange( $editor, $title,
 278                                         $this->mAttribs['rc_timestamp'],
 279                                         $this->mAttribs['rc_comment'],
 280                                         $this->mAttribs['rc_minor'],
 281                                         $this->mAttribs['rc_last_oldid'],
 282                                         $this->mExtra['pageStatus'] );
 283                         }
 284                 }
 285         }
 286
 287         /**
 288          * @deprecated since 1.22, use notifyRCFeeds instead.
 289          */
 290         public function notifyRC2UDP() {
 291                 wfDeprecated( __METHOD__, '1.22' );
 292                 $this->notifyRCFeeds();
 293         }
 294
 295         /**
 296          * Send some text to UDP.
 297          * @deprecated since 1.22
 298          */
 299         public static function sendToUDP( $line, $address = '', $prefix = '', $port = '' ) {
 300                 global $wgRC2UDPPrefix, $wgRC2UDPInterwikiPrefix;
 301                 wfDeprecated( __METHOD__, '1.22' );
 302
 303                 $engine = new UDPRCFeedEngine();
 304                 $feed = array(
 305                         'uri' => "udp://$address:$port/$wgRC2UDPPrefix",
 306                         'formatter' => 'IRCColourfulRCFeedFormatter',
 307                         'add_interwiki_prefix' => $wgRC2UDPInterwikiPrefix,
 308                 );
 309
 310                 return $engine->send( $feed, $line );
 311         }
 312
 313         /**
 314          * Notify all the feeds about the change.
 315          */
 316         public function notifyRCFeeds() {
 317                 global $wgRCFeeds;
 318
 319                 foreach ( $wgRCFeeds as $feed ) {
 320                         $engine = self::getStreamEngine( $feed['uri'] );
 321
 322                         if ( isset( $this->mExtras['actionCommentIRC'] ) ) {
 323                                 $actionComment = $this->mExtras['actionCommentIRC'];
 324                         } else {
 325                                 $actionComment = null;
 326                         }
 327
 328                         $omitBots = isset( $feed['omit_bots'] ) ? $feed['omit_bots'] : false;
 329
 330                         if (
 331                                 ( $omitBots && $this->mAttribs['rc_bot'] ) ||
 332                                 $this->mAttribs['rc_type'] == RC_EXTERNAL
 333                         ) {
 334                                 continue;
 335                         }
 336
 337                         $formatter = new $feed['formatter']();
 338                         $line = $formatter->getLine( $feed, $this, $actionComment );
 339
 340                         $engine->send( $feed, $line );
 341                 }
 342         }
 343
 344         /**
 345          * Gets the stream engine object for a given URI from $wgStreamLoggers
 346          *
 347          * @param $uri string URI to get the engine object for
 348          * @return object The engine object
 349          */
 350         private static function getStreamEngine( $uri ) {
 351                 global $wgStreamLoggers;
 352
 353                 $scheme = parse_url( $uri, PHP_URL_SCHEME );
 354                 if ( !$scheme ) {
 355                         throw new MWException( __FUNCTION__ . ": Invalid stream logger URI: '$uri'" );
 356                 }
 357
 358                 if ( !isset( $wgStreamLoggers[$scheme] ) ) {
 359                         throw new MWException( __FUNCTION__ . ": Unknown stream logger URI scheme: $scheme" );
 360                 }
 361
 362                 return new $wgStreamLoggers[$scheme];
 363         }
 364
 365         /**
 366          * @deprecated since 1.22, moved to IRCColourfulRCFeedFormatter
 367          */
 368         public static function cleanupForIRC( $text ) {
 369                 wfDeprecated( __METHOD__, '1.22' );
 370                 return IRCColourfulRCFeedFormatter::cleanupForIRC( $text );
 371         }
 372
 373         /**
 374          * Mark a given change as patrolled
 375          *
 376          * @param $change Mixed: RecentChange or corresponding rc_id
 377          * @param $auto Boolean: for automatic patrol
 378          * @return Array See doMarkPatrolled(), or null if $change is not an existing rc_id
 379          */
 380         public static function markPatrolled( $change, $auto = false ) {
 381                 global $wgUser;
 382
 383                 $change = $change instanceof RecentChange
 384                         ? $change
 385                         : RecentChange::newFromId( $change );
 386
 387                 if ( !$change instanceof RecentChange ) {
 388                         return null;
 389                 }
 390                 return $change->doMarkPatrolled( $wgUser, $auto );
 391         }
 392
 393         /**
 394          * Mark this RecentChange as patrolled
 395          *
 396          * NOTE: Can also return 'rcpatroldisabled', 'hookaborted' and 'markedaspatrollederror-noautopatrol' as errors
 397          * @param $user User object doing the action
 398          * @param $auto Boolean: for automatic patrol
 399          * @return array of permissions errors, see Title::getUserPermissionsErrors()
 400          */
 401         public function doMarkPatrolled( User $user, $auto = false ) {
 402                 global $wgUseRCPatrol, $wgUseNPPatrol;
 403                 $errors = array();
 404                 // If recentchanges patrol is disabled, only new pages
 405                 // can be patrolled
 406                 if ( !$wgUseRCPatrol && ( !$wgUseNPPatrol || $this->getAttribute( 'rc_type' ) != RC_NEW ) ) {
 407                         $errors[] = array( 'rcpatroldisabled' );
 408                 }
 409                 // Automatic patrol needs "autopatrol", ordinary patrol needs "patrol"
 410                 $right = $auto ? 'autopatrol' : 'patrol';
 411                 $errors = array_merge( $errors, $this->getTitle()->getUserPermissionsErrors( $right, $user ) );
 412                 if ( !wfRunHooks( 'MarkPatrolled', array( $this->getAttribute( 'rc_id' ), &$user, false ) ) ) {
 413                         $errors[] = array( 'hookaborted' );
 414                 }
 415                 // Users without the 'autopatrol' right can't patrol their
 416                 // own revisions
 417                 if ( $user->getName() == $this->getAttribute( 'rc_user_text' ) && !$user->isAllowed( 'autopatrol' ) ) {
 418                         $errors[] = array( 'markedaspatrollederror-noautopatrol' );
 419                 }
 420                 if ( $errors ) {
 421                         return $errors;
 422                 }
 423                 // If the change was patrolled already, do nothing
 424                 if ( $this->getAttribute( 'rc_patrolled' ) ) {
 425                         return array();
 426                 }
 427                 // Actually set the 'patrolled' flag in RC
 428                 $this->reallyMarkPatrolled();
 429                 // Log this patrol event
 430                 PatrolLog::record( $this, $auto, $user );
 431                 wfRunHooks( 'MarkPatrolledComplete', array( $this->getAttribute( 'rc_id' ), &$user, false ) );
 432                 return array();
 433         }
 434
 435         /**
 436          * Mark this RecentChange patrolled, without error checking
 437          * @return Integer: number of affected rows
 438          */
 439         public function reallyMarkPatrolled() {
 440                 $dbw = wfGetDB( DB_MASTER );
 441                 $dbw->update(
 442                         'recentchanges',
 443                         array(
 444                                 'rc_patrolled' => 1
 445                         ),
 446                         array(
 447                                 'rc_id' => $this->getAttribute( 'rc_id' )
 448                         ),
 449                         __METHOD__
 450                 );
 451                 // Invalidate the page cache after the page has been patrolled
 452                 // to make sure that the Patrol link isn't visible any longer!
 453                 $this->getTitle()->invalidateCache();
 454                 return $dbw->affectedRows();
 455         }
 456
 457         /**
 458          * Makes an entry in the database corresponding to an edit
 459          *
 460          * @param $timestamp
 461          * @param $title Title
 462          * @param $minor
 463          * @param $user User
 464          * @param $comment
 465          * @param $oldId
 466          * @param $lastTimestamp
 467          * @param $bot
 468          * @param $ip string
 469          * @param $oldSize int
 470          * @param $newSize int
 471          * @param $newId int
 472          * @param $patrol int
 473          * @return RecentChange
 474          */
 475         public static function notifyEdit( $timestamp, &$title, $minor, &$user, $comment, $oldId,
 476                 $lastTimestamp, $bot, $ip = '', $oldSize = 0, $newSize = 0, $newId = 0, $patrol = 0 ) {
 477                 $rc = new RecentChange;
 478                 $rc->mTitle = $title;
 479                 $rc->mPerformer = $user;
 480                 $rc->mAttribs = array(
 481                         'rc_timestamp'  => $timestamp,
 482                         'rc_cur_time'   => $timestamp,
 483                         'rc_namespace'  => $title->getNamespace(),
 484                         'rc_title'      => $title->getDBkey(),
 485                         'rc_type'       => RC_EDIT,
 486                         'rc_minor'      => $minor ? 1 : 0,
 487                         'rc_cur_id'     => $title->getArticleID(),
 488                         'rc_user'       => $user->getId(),
 489                         'rc_user_text'  => $user->getName(),
 490                         'rc_comment'    => $comment,
 491                         'rc_this_oldid' => $newId,
 492                         'rc_last_oldid' => $oldId,
 493                         'rc_bot'        => $bot ? 1 : 0,
 494                         'rc_ip'         => self::checkIPAddress( $ip ),
 495                         'rc_patrolled'  => intval( $patrol ),
 496                         'rc_new'        => 0,  # obsolete
 497                         'rc_old_len'    => $oldSize,
 498                         'rc_new_len'    => $newSize,
 499                         'rc_deleted'    => 0,
 500                         'rc_logid'      => 0,
 501                         'rc_log_type'   => null,
 502                         'rc_log_action' => '',
 503                         'rc_params'     => ''
 504                 );
 505
 506                 $rc->mExtra = array(
 507                         'prefixedDBkey' => $title->getPrefixedDBkey(),
 508                         'lastTimestamp' => $lastTimestamp,
 509                         'oldSize'       => $oldSize,
 510                         'newSize'       => $newSize,
 511                         'pageStatus'   => 'changed'
 512                 );
 513                 $rc->save();
 514                 return $rc;
 515         }
 516
 517         /**
 518          * Makes an entry in the database corresponding to page creation
 519          * Note: the title object must be loaded with the new id using resetArticleID()
 520          * @todo Document parameters and return
 521          *
 522          * @param $timestamp
 523          * @param $title Title
 524          * @param $minor
 525          * @param $user User
 526          * @param $comment
 527          * @param $bot
 528          * @param $ip string
 529          * @param $size int
 530          * @param $newId int
 531          * @param $patrol int
 532          * @return RecentChange
 533          */
 534         public static function notifyNew( $timestamp, &$title, $minor, &$user, $comment, $bot,
 535                 $ip = '', $size = 0, $newId = 0, $patrol = 0 ) {
 536                 $rc = new RecentChange;
 537                 $rc->mTitle = $title;
 538                 $rc->mPerformer = $user;
 539                 $rc->mAttribs = array(
 540                         'rc_timestamp'      => $timestamp,
 541                         'rc_cur_time'       => $timestamp,
 542                         'rc_namespace'      => $title->getNamespace(),
 543                         'rc_title'          => $title->getDBkey(),
 544                         'rc_type'           => RC_NEW,
 545                         'rc_minor'          => $minor ? 1 : 0,
 546                         'rc_cur_id'         => $title->getArticleID(),
 547                         'rc_user'           => $user->getId(),
 548                         'rc_user_text'      => $user->getName(),
 549                         'rc_comment'        => $comment,
 550                         'rc_this_oldid'     => $newId,
 551                         'rc_last_oldid'     => 0,
 552                         'rc_bot'            => $bot ? 1 : 0,
 553                         'rc_ip'             => self::checkIPAddress( $ip ),
 554                         'rc_patrolled'      => intval( $patrol ),
 555                         'rc_new'            => 1, # obsolete
 556                         'rc_old_len'        => 0,
 557                         'rc_new_len'        => $size,
 558                         'rc_deleted'        => 0,
 559                         'rc_logid'          => 0,
 560                         'rc_log_type'       => null,
 561                         'rc_log_action'     => '',
 562                         'rc_params'         => ''
 563                 );
 564
 565                 $rc->mExtra = array(
 566                         'prefixedDBkey' => $title->getPrefixedDBkey(),
 567                         'lastTimestamp' => 0,
 568                         'oldSize' => 0,
 569                         'newSize' => $size,
 570                         'pageStatus' => 'created'
 571                 );
 572                 $rc->save();
 573                 return $rc;
 574         }
 575
 576         /**
 577          * @param $timestamp
 578          * @param $title
 579          * @param $user
 580          * @param $actionComment
 581          * @param $ip string
 582          * @param $type
 583          * @param $action
 584          * @param $target
 585          * @param $logComment
 586          * @param $params
 587          * @param $newId int
 588          * @param $actionCommentIRC string
 589          * @return bool
 590          */
 591         public static function notifyLog( $timestamp, &$title, &$user, $actionComment, $ip, $type,
 592                 $action, $target, $logComment, $params, $newId = 0, $actionCommentIRC = '' )
 593         {
 594                 global $wgLogRestrictions;
 595                 # Don't add private logs to RC!
 596                 if ( isset( $wgLogRestrictions[$type] ) && $wgLogRestrictions[$type] != '*' ) {
 597                         return false;
 598                 }
 599                 $rc = self::newLogEntry( $timestamp, $title, $user, $actionComment, $ip, $type, $action,
 600                         $target, $logComment, $params, $newId, $actionCommentIRC );
 601                 $rc->save();
 602                 return true;
 603         }
 604
 605         /**
 606          * @param $timestamp
 607          * @param $title Title
 608          * @param $user User
 609          * @param $actionComment
 610          * @param $ip string
 611          * @param $type
 612          * @param $action
 613          * @param $target Title
 614          * @param $logComment
 615          * @param $params
 616          * @param $newId int
 617          * @param $actionCommentIRC string
 618          * @return RecentChange
 619          */
 620         public static function newLogEntry( $timestamp, &$title, &$user, $actionComment, $ip,
 621                 $type, $action, $target, $logComment, $params, $newId = 0, $actionCommentIRC = '' ) {
 622                 global $wgRequest;
 623
 624                 ## Get pageStatus for email notification
 625                 switch ( $type . '-' . $action ) {
 626                         case 'delete-delete':
 627                                 $pageStatus = 'deleted';
 628                                 break;
 629                         case 'move-move':
 630                         case 'move-move_redir':
 631                                 $pageStatus = 'moved';
 632                                 break;
 633                         case 'delete-restore':
 634                                 $pageStatus = 'restored';
 635                                 break;
 636                         case 'upload-upload':
 637                                 $pageStatus = 'created';
 638                                 break;
 639                         case 'upload-overwrite':
 640                         default:
 641                                 $pageStatus = 'changed';
 642                                 break;
 643                 }
 644
 645                 $rc = new RecentChange;
 646                 $rc->mTitle = $target;
 647                 $rc->mPerformer = $user;
 648                 $rc->mAttribs = array(
 649                         'rc_timestamp'  => $timestamp,
 650                         'rc_cur_time'   => $timestamp,
 651                         'rc_namespace'  => $target->getNamespace(),
 652                         'rc_title'      => $target->getDBkey(),
 653                         'rc_type'       => RC_LOG,
 654                         'rc_minor'      => 0,
 655                         'rc_cur_id'     => $target->getArticleID(),
 656                         'rc_user'       => $user->getId(),
 657                         'rc_user_text'  => $user->getName(),
 658                         'rc_comment'    => $logComment,
 659                         'rc_this_oldid' => 0,
 660                         'rc_last_oldid' => 0,
 661                         'rc_bot'        => $user->isAllowed( 'bot' ) ? $wgRequest->getBool( 'bot', true ) : 0,
 662                         'rc_ip'         => self::checkIPAddress( $ip ),
 663                         'rc_patrolled'  => 1,
 664                         'rc_new'        => 0, # obsolete
 665                         'rc_old_len'    => null,
 666                         'rc_new_len'    => null,
 667                         'rc_deleted'    => 0,
 668                         'rc_logid'      => $newId,
 669                         'rc_log_type'   => $type,
 670                         'rc_log_action' => $action,
 671                         'rc_params'     => $params
 672                 );
 673
 674                 $rc->mExtra = array(
 675                         'prefixedDBkey' => $title->getPrefixedDBkey(),
 676                         'lastTimestamp' => 0,
 677                         'actionComment' => $actionComment, // the comment appended to the action, passed from LogPage
 678                         'pageStatus'    => $pageStatus,
 679                         'actionCommentIRC' => $actionCommentIRC
 680                 );
 681                 return $rc;
 682         }
 683
 684         /**
 685          * Initialises the members of this object from a mysql row object
 686          *
 687          * @param $row
 688          */
 689         public function loadFromRow( $row ) {
 690                 $this->mAttribs = get_object_vars( $row );
 691                 $this->mAttribs['rc_timestamp'] = wfTimestamp( TS_MW, $this->mAttribs['rc_timestamp'] );
 692                 $this->mAttribs['rc_deleted'] = $row->rc_deleted; // MUST be set
 693         }
 694
 695         /**
 696          * Makes a pseudo-RC entry from a cur row
 697          *
 698          * @deprected in 1.22
 699          * @param $row
 700          */
 701         public function loadFromCurRow( $row ) {
 702                 wfDeprecated( __METHOD__, '1.22' );
 703                 $this->mAttribs = array(
 704                         'rc_timestamp' => wfTimestamp( TS_MW, $row->rev_timestamp ),
 705                         'rc_cur_time' => $row->rev_timestamp,
 706                         'rc_user' => $row->rev_user,
 707                         'rc_user_text' => $row->rev_user_text,
 708                         'rc_namespace' => $row->page_namespace,
 709                         'rc_title' => $row->page_title,
 710                         'rc_comment' => $row->rev_comment,
 711                         'rc_minor' => $row->rev_minor_edit ? 1 : 0,
 712                         'rc_type' => $row->page_is_new ? RC_NEW : RC_EDIT,
 713                         'rc_cur_id' => $row->page_id,
 714                         'rc_this_oldid' => $row->rev_id,
 715                         'rc_last_oldid' => isset( $row->rc_last_oldid ) ? $row->rc_last_oldid : 0,
 716                         'rc_bot' => 0,
 717                         'rc_ip' => '',
 718                         'rc_id' => $row->rc_id,
 719                         'rc_patrolled' => $row->rc_patrolled,
 720                         'rc_new' => $row->page_is_new, # obsolete
 721                         'rc_old_len' => $row->rc_old_len,
 722                         'rc_new_len' => $row->rc_new_len,
 723                         'rc_params' => isset( $row->rc_params ) ? $row->rc_params : '',
 724                         'rc_log_type' => isset( $row->rc_log_type ) ? $row->rc_log_type : null,
 725                         'rc_log_action' => isset( $row->rc_log_action ) ? $row->rc_log_action : null,
 726                         'rc_logid' => isset( $row->rc_logid ) ? $row->rc_logid : 0,
 727                         'rc_deleted' => $row->rc_deleted // MUST be set
 728                 );
 729         }
 730
 731         /**
 732          * Get an attribute value
 733          *
 734          * @param string $name Attribute name
 735          * @return mixed
 736          */
 737         public function getAttribute( $name ) {
 738                 return isset( $this->mAttribs[$name] ) ? $this->mAttribs[$name] : null;
 739         }
 740
 741         /**
 742          * @return array
 743          */
 744         public function getAttributes() {
 745                 return $this->mAttribs;
 746         }
 747
 748         /**
 749          * Gets the end part of the diff URL associated with this object
 750          * Blank if no diff link should be displayed
 751          * @param $forceCur
 752          * @return string
 753          */
 754         public function diffLinkTrail( $forceCur ) {
 755                 if ( $this->mAttribs['rc_type'] == RC_EDIT ) {
 756                         $trail = "curid=" . (int)( $this->mAttribs['rc_cur_id'] ) .
 757                                 "&oldid=" . (int)( $this->mAttribs['rc_last_oldid'] );
 758                         if ( $forceCur ) {
 759                                 $trail .= '&diff=0';
 760                         } else {
 761                                 $trail .= '&diff=' . (int)( $this->mAttribs['rc_this_oldid'] );
 762                         }
 763                 } else {
 764                         $trail = '';
 765                 }
 766                 return $trail;
 767         }
 768
 769         /**
 770          * Returns the change size (HTML).
 771          * The lengths can be given optionally.
 772          * @param $old int
 773          * @param $new int
 774          * @return string
 775          */
 776         public function getCharacterDifference( $old = 0, $new = 0 ) {
 777                 if ( $old === 0 ) {
 778                         $old = $this->mAttribs['rc_old_len'];
 779                 }
 780                 if ( $new === 0 ) {
 781                         $new = $this->mAttribs['rc_new_len'];
 782                 }
 783                 if ( $old === null || $new === null ) {
 784                         return '';
 785                 }
 786                 return ChangesList::showCharacterDifference( $old, $new );
 787         }
 788
 789         /**
 790          * Purge expired changes from the recentchanges table
 791          * @since 1.22
 792          */
 793         public static function purgeExpiredChanges() {
 794                 if ( wfReadOnly() ) {
 795                         return;
 796                 }
 797
 798                 $method = __METHOD__;
 799                 $dbw = wfGetDB( DB_MASTER );
 800                 $dbw->onTransactionIdle( function() use ( $dbw, $method ) {
 801                         global $wgRCMaxAge;
 802
 803                         $cutoff = $dbw->timestamp( time() - $wgRCMaxAge );
 804                         $dbw->delete(
 805                                 'recentchanges',
 806                                 array( 'rc_timestamp < ' . $dbw->addQuotes( $cutoff ) ),
 807                                 $method
 808                         );
 809                 } );
 810         }
 811
 812         private static function checkIPAddress( $ip ) {
 813                 global $wgRequest;
 814                 if ( $ip ) {
 815                         if ( !IP::isIPAddress( $ip ) ) {
 816                                 throw new MWException( "Attempt to write \"" . $ip . "\" as an IP address into recent changes" );
 817                         }
 818                 } else {
 819                         $ip = $wgRequest->getIP();
 820                         if ( !$ip ) {
 821                                 $ip = '';
 822                         }
 823                 }
 824                 return $ip;
 825         }
 826
 827         /**
 828          * Check whether the given timestamp is new enough to have a RC row with a given tolerance
 829          * as the recentchanges table might not be cleared out regularly (so older entries might exist)
 830          * or rows which will be deleted soon shouldn't be included.
 831          *
 832          * @param $timestamp mixed MWTimestamp compatible timestamp
 833          * @param $tolerance integer Tolerance in seconds
 834          * @return bool
 835          */
 836         public static function isInRCLifespan( $timestamp, $tolerance = 0 ) {
 837                 global $wgRCMaxAge;
 838                 return wfTimestamp( TS_UNIX, $timestamp ) > time() - $tolerance - $wgRCMaxAge;
 839         }
 840 }