includes/logging/LogFormatter.php

   1 <?php
   2 /**
   3  * Contains classes for formatting log entries
   4  *
   5  * @file
   6  * @author Niklas Laxström
   7  * @license http://www.gnu.org/copyleft/gpl.html GNU General Public License 2.0 or later
   8  * @since 1.19
   9  */
  10
  11 /**
  12  * Implements the default log formatting.
  13  * Can be overridden by subclassing and setting
  14  * $wgLogActionsHandlers['type/subtype'] = 'class'; or
  15  * $wgLogActionsHandlers['type/*'] = 'class';
  16  * @since 1.19
  17  */
  18 class LogFormatter {
  19         // Audience options for viewing usernames, comments, and actions
  20         const FOR_PUBLIC = 1;
  21         const FOR_THIS_USER = 2;
  22
  23         // Static->
  24
  25         /**
  26          * Constructs a new formatter suitable for given entry.
  27          * @param $entry LogEntry
  28          * @return LogFormatter
  29          */
  30         public static function newFromEntry( LogEntry $entry ) {
  31                 global $wgLogActionsHandlers;
  32                 $fulltype = $entry->getFullType();
  33                 $wildcard = $entry->getType() . '/*';
  34                 $handler = '';
  35
  36                 if ( isset( $wgLogActionsHandlers[$fulltype] ) ) {
  37                         $handler = $wgLogActionsHandlers[$fulltype];
  38                 } elseif ( isset( $wgLogActionsHandlers[$wildcard] ) ) {
  39                         $handler = $wgLogActionsHandlers[$wildcard];
  40                 }
  41
  42                 if ( $handler !== '' && is_string( $handler ) && class_exists( $handler ) ) {
  43                         return new $handler( $entry );
  44                 }
  45
  46                 return new LegacyLogFormatter( $entry );
  47         }
  48
  49         /**
  50          * Handy shortcut for constructing a formatter directly from
  51          * database row.
  52          * @param $row
  53          * @see DatabaseLogEntry::getSelectQueryData
  54          * @return LogFormatter
  55          */
  56         public static function newFromRow( $row ) {
  57                 return self::newFromEntry( DatabaseLogEntry::newFromRow( $row ) );
  58         }
  59
  60         // Nonstatic->
  61
  62         /// @var LogEntry
  63         protected $entry;
  64
  65         /// Integer constant for handling log_deleted
  66         protected $audience = self::FOR_PUBLIC;
  67
  68         /// Whether to output user tool links
  69         protected $linkFlood = false;
  70
  71         /**
  72          * Set to true if we are constructing a message text that is going to
  73          * be included in page history or send to IRC feed. Links are replaced
  74          * with plaintext or with [[pagename]] kind of syntax, that is parsed
  75          * by page histories and IRC feeds.
  76          * @var boolean
  77          */
  78         protected $plaintext = false;
  79
  80         protected $irctext = false;
  81
  82         protected function __construct( LogEntry $entry ) {
  83                 $this->entry = $entry;
  84                 $this->context = RequestContext::getMain();
  85         }
  86
  87         /**
  88          * Replace the default context
  89          * @param $context IContextSource
  90          */
  91         public function setContext( IContextSource $context ) {
  92                 $this->context = $context;
  93         }
  94
  95         /**
  96          * Set the visibility restrictions for displaying content.
  97          * If set to public, and an item is deleted, then it will be replaced
  98          * with a placeholder even if the context user is allowed to view it.
  99          * @param $audience integer self::FOR_THIS_USER or self::FOR_PUBLIC
 100          */
 101         public function setAudience( $audience ) {
 102                 $this->audience = ( $audience == self::FOR_THIS_USER )
 103                         ? self::FOR_THIS_USER
 104                         : self::FOR_PUBLIC;
 105         }
 106
 107         /**
 108          * Check if a log item can be displayed
 109          * @param $field integer LogPage::DELETED_* constant
 110          * @return bool
 111          */
 112         protected function canView( $field ) {
 113                 if ( $this->audience == self::FOR_THIS_USER ) {
 114                         return LogEventsList::userCanBitfield(
 115                                 $this->entry->getDeleted(), $field, $this->context->getUser() );
 116                 } else {
 117                         return !$this->entry->isDeleted( $field );
 118                 }
 119         }
 120
 121         /**
 122          * If set to true, will produce user tool links after
 123          * the user name. This should be replaced with generic
 124          * CSS/JS solution.
 125          * @param $value boolean
 126          */
 127         public function setShowUserToolLinks( $value ) {
 128                 $this->linkFlood = $value;
 129         }
 130
 131         /**
 132          * Ugly hack to produce plaintext version of the message.
 133          * Usually you also want to set extraneous request context
 134          * to avoid formatting for any particular user.
 135          * @see getActionText()
 136          * @return string text
 137          */
 138         public function getPlainActionText() {
 139                 $this->plaintext = true;
 140                 $text = $this->getActionText();
 141                 $this->plaintext = false;
 142                 return $text;
 143         }
 144
 145         /**
 146          * Even uglier hack to maintain backwards compatibilty with IRC bots
 147          * (bug 34508).
 148          * @see getActionText()
 149          * @return string text
 150          */
 151         public function getIRCActionComment() {
 152                 $actionComment = $this->getIRCActionText();
 153                 $comment = $this->entry->getComment();
 154
 155                 if ( $comment != '' ) {
 156                         if ( $actionComment == '' ) {
 157                                 $actionComment = $comment;
 158                         } else {
 159                                 $actionComment .= wfMsgForContent( 'colon-separator' ) . $comment;
 160                         }
 161                 }
 162
 163                 return $actionComment;
 164         }
 165
 166         /**
 167          * Even uglier hack to maintain backwards compatibilty with IRC bots
 168          * (bug 34508).
 169          * @see getActionText()
 170          * @return string text
 171          */
 172         public function getIRCActionText() {
 173                 $this->plaintext = true;
 174                 $this->irctext = true;
 175                 $text = $this->getActionText();
 176
 177                 $entry = $this->entry;
 178                 $parameters = $entry->getParameters();
 179                 // @see LogPage::actionText()
 180                 $msgOpts = array( 'parsemag', 'escape', 'replaceafter', 'content' );
 181                 // Text of title the action is aimed at.
 182                 $target = $entry->getTarget()->getPrefixedText() ;
 183                 $text = null;
 184                 switch( $entry->getType() ) {
 185                         case 'move':
 186                                 switch( $entry->getSubtype() ) {
 187                                         case 'move':
 188                                                 $movesource =  $parameters['4::target'];
 189                                                 $text = wfMsgExt( '1movedto2', $msgOpts, $target, $movesource );
 190                                                 break;
 191                                         case 'move_redir':
 192                                                 $movesource =  $parameters['4::target'];
 193                                                 $text = wfMsgExt( '1movedto2_redir', $msgOpts, $target, $movesource );
 194                                                 break;
 195                                         case 'move-noredirect':
 196                                                 break;
 197                                         case 'move_redir-noredirect':
 198                                                 break;
 199                                 }
 200                                 break;
 201
 202                         case 'delete':
 203                                 switch( $entry->getSubtype() ) {
 204                                         case 'delete':
 205                                                 $text = wfMsgExt( 'deletedarticle', $msgOpts, $target );
 206                                                 break;
 207                                         case 'restore':
 208                                                 $text = wfMsgExt( 'undeletedarticle', $msgOpts, $target );
 209                                                 break;
 210                                         //case 'revision': // Revision deletion
 211                                         //case 'event': // Log deletion
 212                                                 // see https://svn.wikimedia.org/viewvc/mediawiki/trunk/phase3/includes/LogPage.php?&pathrev=97044&r1=97043&r2=97044
 213                                         //default:
 214                                 }
 215                                 break;
 216
 217                         case 'patrol':
 218                                 // https://svn.wikimedia.org/viewvc/mediawiki/trunk/phase3/includes/PatrolLog.php?&pathrev=97495&r1=97494&r2=97495
 219                                 // Create a diff link to the patrolled revision
 220                                 if ( $entry->getSubtype() === 'patrol' ) {
 221                                         $diffLink = htmlspecialchars(
 222                                                 wfMsgForContent( 'patrol-log-diff', $parameters['4::curid'] ) );
 223                                         $text = wfMsgForContent( 'patrol-log-line', $diffLink, "[[$target]]", "" );
 224                                 } else {
 225                                         // broken??
 226                                 }
 227                                 break;
 228
 229                         case 'newusers':
 230                                 switch( $entry->getSubtype() ) {
 231                                         case 'newusers':
 232                                         case 'create':
 233                                                 $text = wfMsgExt( 'newuserlog-create-entry', $msgOpts /* no params */ );
 234                                                 break;
 235                                         case 'create2':
 236                                                 $text = wfMsgExt( 'newuserlog-create2-entry', $msgOpts, $target );
 237                                                 break;
 238                                         case 'autocreate':
 239                                                 $text = wfMsgExt( 'newuserlog-autocreate-entry', $msgOpts /* no params */ );
 240                                                 break;
 241                                 }
 242                                 break;
 243
 244                         case 'upload':
 245                                 switch( $entry->getSubtype() ) {
 246                                         case 'upload':
 247                                                 $text = wfMsgExt( 'uploadedimage', $msgOpts, $target );
 248                                                 break;
 249                                         case 'overwrite':
 250                                                 $text = wfMsgExt( 'overwroteimage', $msgOpts, $target );
 251                                                 break;
 252                                 }
 253                                 break;
 254
 255
 256                         // case 'suppress' --private log -- aaron  (sign your messages so we know who to blame in a few years :-D)
 257                         // default:
 258                 }
 259                 if( is_null( $text ) ) {
 260                         $text = $this->getPlainActionText();
 261                 }
 262
 263                 $this->plaintext = false;
 264                 $this->irctext = false;
 265                 return $text;
 266         }
 267
 268         /**
 269          * Gets the log action, including username.
 270          * @return string HTML
 271          */
 272         public function getActionText() {
 273                 if ( $this->canView( LogPage::DELETED_ACTION ) ) {
 274                         $element = $this->getActionMessage();
 275                         if ( $element instanceof Message ) {
 276                                 $element = $this->plaintext ? $element->text() : $element->escaped();
 277                         }
 278                         if ( $this->entry->isDeleted( LogPage::DELETED_ACTION ) ) {
 279                                 $element = $this->styleRestricedElement( $element );
 280                         }
 281                 } else {
 282                         $performer = $this->getPerformerElement() . $this->msg( 'word-separator' )->text();
 283                         $element = $performer . $this->getRestrictedElement( 'rev-deleted-event' );
 284                 }
 285
 286                 return $element;
 287         }
 288
 289         /**
 290          * Returns a sentence describing the log action. Usually
 291          * a Message object is returned, but old style log types
 292          * and entries might return pre-escaped html string.
 293          * @return Message|string pre-escaped html
 294          */
 295         protected function getActionMessage() {
 296                 $message = $this->msg( $this->getMessageKey() );
 297                 $message->params( $this->getMessageParameters() );
 298                 return $message;
 299         }
 300
 301         /**
 302          * Returns a key to be used for formatting the action sentence.
 303          * Default is logentry-TYPE-SUBTYPE for modern logs. Legacy log
 304          * types will use custom keys, and subclasses can also alter the
 305          * key depending on the entry itself.
 306          * @return string message key
 307          */
 308         protected function getMessageKey() {
 309                 $type = $this->entry->getType();
 310                 $subtype = $this->entry->getSubtype();
 311
 312                 return "logentry-$type-$subtype";
 313         }
 314
 315         /**
 316          * Extracts the optional extra parameters for use in action messages.
 317          * The array indexes start from number 3.
 318          * @return array
 319          */
 320         protected function extractParameters() {
 321                 $entry = $this->entry;
 322                 $params = array();
 323
 324                 if ( $entry->isLegacy() ) {
 325                         foreach ( $entry->getParameters() as $index => $value ) {
 326                                 $params[$index + 3] = $value;
 327                         }
 328                 }
 329
 330                 // Filter out parameters which are not in format #:foo
 331                 foreach ( $entry->getParameters() as $key => $value ) {
 332                         if ( strpos( $key, ':' ) === false ) continue;
 333                         list( $index, $type, $name ) = explode( ':', $key, 3 );
 334                         $params[$index - 1] = $value;
 335                 }
 336
 337                 /* Message class doesn't like non consecutive numbering.
 338                  * Fill in missing indexes with empty strings to avoid
 339                  * incorrect renumbering.
 340                  */
 341                 if ( count( $params ) ) {
 342                         $max = max( array_keys( $params ) );
 343                         for ( $i = 4; $i < $max; $i++ ) {
 344                                 if ( !isset( $params[$i] ) ) {
 345                                         $params[$i] = '';
 346                                 }
 347                         }
 348                 }
 349                 return $params;
 350         }
 351
 352         /**
 353          * Formats parameters intented for action message from
 354          * array of all parameters. There are three hardcoded
 355          * parameters (array is zero-indexed, this list not):
 356          *  - 1: user name with premade link
 357          *  - 2: usable for gender magic function
 358          *  - 3: target page with premade link
 359          * @return array
 360          */
 361         protected function getMessageParameters() {
 362                 if ( isset( $this->parsedParameters ) ) {
 363                         return $this->parsedParameters;
 364                 }
 365
 366                 $entry = $this->entry;
 367                 $params = $this->extractParameters();
 368                 $params[0] = Message::rawParam( $this->getPerformerElement() );
 369                 $params[1] = $entry->getPerformer()->getName();
 370                 $params[2] = Message::rawParam( $this->makePageLink( $entry->getTarget() ) );
 371
 372                 // Bad things happens if the numbers are not in correct order
 373                 ksort( $params );
 374                 return $this->parsedParameters = $params;
 375         }
 376
 377         /**
 378          * Helper to make a link to the page, taking the plaintext
 379          * value in consideration.
 380          * @param $title Title the page
 381          * @param $parameters array query parameters
 382          * @return String
 383          */
 384         protected function makePageLink( Title $title = null, $parameters = array() ) {
 385                 if ( !$this->plaintext ) {
 386                         $link = Linker::link( $title, null, array(), $parameters );
 387                 } else {
 388                         if ( !$title instanceof Title ) {
 389                                 throw new MWException( "Expected title, got null" );
 390                         }
 391                         $link = '[[' . $title->getPrefixedText() . ']]';
 392                 }
 393                 return $link;
 394         }
 395
 396         /**
 397          * Provides the name of the user who performed the log action.
 398          * Used as part of log action message or standalone, depending
 399          * which parts of the log entry has been hidden.
 400          * @return String
 401          */
 402         public function getPerformerElement() {
 403                 if ( $this->canView( LogPage::DELETED_USER ) ) {
 404                         $performer = $this->entry->getPerformer();
 405                         $element = $this->makeUserLink( $performer );
 406                         if ( $this->entry->isDeleted( LogPage::DELETED_USER ) ) {
 407                                 $element = $this->styleRestricedElement( $element );
 408                         }
 409                 } else {
 410                         $element = $this->getRestrictedElement( 'rev-deleted-user' );
 411                 }
 412
 413                 return $element;
 414         }
 415
 416         /**
 417          * Gets the luser provided comment
 418          * @return string HTML
 419          */
 420         public function getComment() {
 421                 if ( $this->canView( LogPage::DELETED_COMMENT ) ) {
 422                         $comment = Linker::commentBlock( $this->entry->getComment() );
 423                         // No hard coded spaces thanx
 424                         $element = ltrim( $comment );
 425                         if ( $this->entry->isDeleted( LogPage::DELETED_COMMENT ) ) {
 426                                 $element = $this->styleRestricedElement( $element );
 427                         }
 428                 } else {
 429                         $element = $this->getRestrictedElement( 'rev-deleted-comment' );
 430                 }
 431
 432                 return $element;
 433         }
 434
 435         /**
 436          * Helper method for displaying restricted element.
 437          * @param $message string
 438          * @return string HTML or wikitext
 439          */
 440         protected function getRestrictedElement( $message ) {
 441                 if ( $this->plaintext ) {
 442                         return $this->msg( $message )->text();
 443                 }
 444
 445                 $content =  $this->msg( $message )->escaped();
 446                 $attribs = array( 'class' => 'history-deleted' );
 447                 return Html::rawElement( 'span', $attribs, $content );
 448         }
 449
 450         /**
 451          * Helper method for styling restricted element.
 452          * @param $content string
 453          * @return string HTML or wikitext
 454          */
 455         protected function styleRestricedElement( $content ) {
 456                 if ( $this->plaintext ) {
 457                         return $content;
 458                 }
 459                 $attribs = array( 'class' => 'history-deleted' );
 460                 return Html::rawElement( 'span', $attribs, $content );
 461         }
 462
 463         /**
 464          * Shortcut for wfMessage which honors local context.
 465          * @todo Would it be better to require replacing the global context instead?
 466          * @param $key string
 467          * @return Message
 468          */
 469         protected function msg( $key ) {
 470                 return wfMessage( $key )
 471                         ->inLanguage( $this->context->getLanguage() )
 472                         ->title( $this->context->getTitle() );
 473         }
 474
 475         protected function makeUserLink( User $user ) {
 476                 if ( $this->plaintext ) {
 477                         $element = $user->getName();
 478                 } else {
 479                         $element = Linker::userLink(
 480                                 $user->getId(),
 481                                 $user->getName()
 482                         );
 483
 484                         if ( $this->linkFlood ) {
 485                                 $element .= Linker::userToolLinks(
 486                                         $user->getId(),
 487                                         $user->getName(),
 488                                         true, // Red if no edits
 489                                         0, // Flags
 490                                         $user->getEditCount()
 491                                 );
 492                         }
 493                 }
 494                 return $element;
 495         }
 496
 497         /**
 498          * @return Array of titles that should be preloaded with LinkBatch.
 499          */
 500         public function getPreloadTitles() {
 501                 return array();
 502         }
 503
 504 }
 505
 506 /**
 507  * This class formats all log entries for log types
 508  * which have not been converted to the new system.
 509  * This is not about old log entries which store
 510  * parameters in a different format - the new
 511  * LogFormatter classes have code to support formatting
 512  * those too.
 513  * @since 1.19
 514  */
 515 class LegacyLogFormatter extends LogFormatter {
 516         protected function getActionMessage() {
 517                 $entry = $this->entry;
 518                 $action = LogPage::actionText(
 519                         $entry->getType(),
 520                         $entry->getSubtype(),
 521                         $entry->getTarget(),
 522                         $this->plaintext ? null : $this->context->getSkin(),
 523                         (array)$entry->getParameters(),
 524                         !$this->plaintext // whether to filter [[]] links
 525                 );
 526
 527                 $performer = $this->getPerformerElement();
 528                 if ( !$this->irctext ) {
 529                         $action = $performer .  $this->msg( 'word-separator' )->text() . $action;
 530                 }
 531
 532                 return $action;
 533         }
 534
 535 }
 536
 537 /**
 538  * This class formats move log entries.
 539  * @since 1.19
 540  */
 541 class MoveLogFormatter extends LogFormatter {
 542         public function getPreloadTitles() {
 543                 $params = $this->extractParameters();
 544                 return array( Title::newFromText( $params[3] ) );
 545         }
 546
 547         protected function getMessageKey() {
 548                 $key = parent::getMessageKey();
 549                 $params = $this->getMessageParameters();
 550                 if ( isset( $params[4] ) && $params[4] === '1' ) {
 551                         $key .= '-noredirect';
 552                 }
 553                 return $key;
 554         }
 555
 556         protected function getMessageParameters() {
 557                 $params = parent::getMessageParameters();
 558                 $oldname = $this->makePageLink( $this->entry->getTarget(), array( 'redirect' => 'no' ) );
 559                 $newname = $this->makePageLink( Title::newFromText( $params[3] ) );
 560                 $params[2] = Message::rawParam( $oldname );
 561                 $params[3] = Message::rawParam( $newname );
 562                 return $params;
 563         }
 564 }
 565
 566 /**
 567  * This class formats delete log entries.
 568  * @since 1.19
 569  */
 570 class DeleteLogFormatter extends LogFormatter {
 571         protected function getMessageKey() {
 572                 $key = parent::getMessageKey();
 573                 if ( in_array( $this->entry->getSubtype(), array( 'event', 'revision' ) ) ) {
 574                         if ( count( $this->getMessageParameters() ) < 5 ) {
 575                                 return "$key-legacy";
 576                         }
 577                 }
 578                 return $key;
 579         }
 580
 581         protected function getMessageParameters() {
 582                 if ( isset( $this->parsedParametersDeleteLog ) ) {
 583                         return $this->parsedParametersDeleteLog;
 584                 }
 585
 586                 $params = parent::getMessageParameters();
 587                 $subtype = $this->entry->getSubtype();
 588                 if ( in_array( $subtype, array( 'event', 'revision' ) ) ) {
 589                         if (
 590                                 ($subtype === 'event' && count( $params ) === 6 ) ||
 591                                 ($subtype === 'revision' && isset( $params[3] ) && $params[3] === 'revision' )
 592                         ) {
 593                                 $paramStart = $subtype === 'revision' ? 4 : 3;
 594
 595                                 $old = $this->parseBitField( $params[$paramStart+1] );
 596                                 $new = $this->parseBitField( $params[$paramStart+2] );
 597                                 list( $hid, $unhid, $extra ) = RevisionDeleter::getChanges( $new, $old );
 598                                 $changes = array();
 599                                 foreach ( $hid as $v ) {
 600                                         $changes[] = $this->msg( "$v-hid" )->plain();
 601                                 }
 602                                 foreach ( $unhid as $v ) {
 603                                         $changes[] = $this->msg( "$v-unhid" )->plain();
 604                                 }
 605                                 foreach ( $extra as $v ) {
 606                                         $changes[] = $this->msg( $v )->plain();
 607                                 }
 608                                 $changeText =  $this->context->getLanguage()->listToText( $changes );
 609
 610
 611                                 $newParams = array_slice( $params, 0, 3 );
 612                                 $newParams[3] = $changeText;
 613                                 $count = count( explode( ',', $params[$paramStart] ) );
 614                                 $newParams[4] = $this->context->getLanguage()->formatNum( $count );
 615                                 return $this->parsedParametersDeleteLog = $newParams;
 616                         } else {
 617                                 return $this->parsedParametersDeleteLog = array_slice( $params, 0, 3 );
 618                         }
 619                 }
 620
 621                 return $this->parsedParametersDeleteLog = $params;
 622         }
 623
 624         protected function parseBitField( $string ) {
 625                 // Input is like ofield=2134 or just the number
 626                 if ( strpos( $string, 'field=' ) === 1 ) {
 627                         list( , $field ) = explode( '=', $string );
 628                         return (int) $field;
 629                 } else {
 630                         return (int) $string;
 631                 }
 632         }
 633 }
 634
 635 /**
 636  * This class formats patrol log entries.
 637  * @since 1.19
 638  */
 639 class PatrolLogFormatter extends LogFormatter {
 640         protected function getMessageKey() {
 641                 $key = parent::getMessageKey();
 642                 $params = $this->getMessageParameters();
 643                 if ( isset( $params[5] ) && $params[5] ) {
 644                         $key .= '-auto';
 645                 }
 646                 return $key;
 647         }
 648
 649         protected function getMessageParameters() {
 650                 $params = parent::getMessageParameters();
 651                 $newParams = array_slice( $params, 0, 3 );
 652
 653                 $target = $this->entry->getTarget();
 654                 $oldid = $params[3];
 655                 $revision = $this->context->getLanguage()->formatNum( $oldid, true );
 656
 657                 if ( $this->plaintext ) {
 658                         $revlink = $revision;
 659                 } elseif ( $target->exists() ) {
 660                         $query = array(
 661                                 'oldid' => $oldid,
 662                                 'diff' => 'prev'
 663                         );
 664                         $revlink = Linker::link( $target, htmlspecialchars( $revision ), array(), $query );
 665                 } else {
 666                         $revlink = htmlspecialchars( $revision );
 667                 }
 668
 669                 $newParams[3] = Message::rawParam( $revlink );
 670                 return $newParams;
 671         }
 672 }
 673
 674 /**
 675  * This class formats new user log entries.
 676  * @since 1.19
 677  */
 678 class NewUsersLogFormatter extends LogFormatter {
 679         protected function getMessageParameters() {
 680                 $params = parent::getMessageParameters();
 681                 if ( $this->entry->getSubtype() === 'create2' ) {
 682                         if ( isset( $params[3] ) ) {
 683                                 $target = User::newFromId( $params[3] );
 684                         } else {
 685                                 $target = User::newFromName( $this->entry->getTarget()->getText(), false );
 686                         }
 687                         $params[2] = Message::rawParam( $this->makeUserLink( $target ) );
 688                         $params[3] = $target->getName();
 689                 }
 690                 return $params;
 691         }
 692
 693         public function getComment() {
 694                 $timestamp = wfTimestamp( TS_MW, $this->entry->getTimestamp() );
 695                 if ( $timestamp < '20080129000000' ) {
 696                         # Suppress $comment from old entries (before 2008-01-29),
 697                         # not needed and can contain incorrect links
 698                         return '';
 699                 }
 700                 return parent::getComment();
 701         }
 702 }