includes/PageHistory.php

   1 <?php
   2 /**
   3  * Page history
   4  *
   5  * Split off from Article.php and Skin.php, 2003-12-22
   6  */
   7
   8 /**
   9  * This class handles printing the history page for an article.  In order to
  10  * be efficient, it uses timestamps rather than offsets for paging, to avoid
  11  * costly LIMIT,offset queries.
  12  *
  13  * Construct it by passing in an Article, and call $h->history() to print the
  14  * history.
  15  *
  16  */
  17 class PageHistory {
  18         const DIR_PREV = 0;
  19         const DIR_NEXT = 1;
  20
  21         var $mArticle, $mTitle, $mSkin;
  22         var $lastdate;
  23         var $linesonpage;
  24         var $mNotificationTimestamp;
  25         var $mLatestId = null;
  26
  27         /**
  28          * Construct a new PageHistory.
  29          *
  30          * @param Article $article
  31          * @returns nothing
  32          */
  33         function __construct($article) {
  34                 global $wgUser;
  35
  36                 $this->mArticle =& $article;
  37                 $this->mTitle =& $article->mTitle;
  38                 $this->mNotificationTimestamp = NULL;
  39                 $this->mSkin = $wgUser->getSkin();
  40         }
  41
  42         /**
  43          * Print the history page for an article.
  44          *
  45          * @returns nothing
  46          */
  47         function history() {
  48                 global $wgOut, $wgRequest, $wgTitle;
  49
  50                 /*
  51                  * Allow client caching.
  52                  */
  53
  54                 if( $wgOut->checkLastModified( $this->mArticle->getTimestamp() ) )
  55                         /* Client cache fresh and headers sent, nothing more to do. */
  56                         return;
  57
  58                 $fname = 'PageHistory::history';
  59                 wfProfileIn( $fname );
  60
  61                 /*
  62                  * Setup page variables.
  63                  */
  64                 $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
  65                 $wgOut->setArticleFlag( false );
  66                 $wgOut->setArticleRelated( true );
  67                 $wgOut->setRobotpolicy( 'noindex,nofollow' );
  68                 $wgOut->setSyndicated( true );
  69
  70                 $logPage = SpecialPage::getTitleFor( 'Log' );
  71                 $logLink = $this->mSkin->makeKnownLinkObj( $logPage, wfMsgHtml( 'viewpagelogs' ), 'page=' . $this->mTitle->getPrefixedUrl() );
  72
  73                 $subtitle = wfMsgHtml( 'revhistory' ) . '<br />' . $logLink;
  74                 $wgOut->setSubtitle( $subtitle );
  75
  76                 $feedType = $wgRequest->getVal( 'feed' );
  77                 if( $feedType ) {
  78                         wfProfileOut( $fname );
  79                         return $this->feed( $feedType );
  80                 }
  81
  82                 /*
  83                  * Fail if article doesn't exist.
  84                  */
  85                 if( !$this->mTitle->exists() ) {
  86                         $wgOut->addWikiText( wfMsg( 'nohistory' ) );
  87                         wfProfileOut( $fname );
  88                         return;
  89                 }
  90
  91
  92                 /*
  93                  * "go=first" means to jump to the last (earliest) history page.
  94                  * This is deprecated, it no longer appears in the user interface
  95                  */
  96                 if ( $wgRequest->getText("go") == 'first' ) {
  97                         $limit = $wgRequest->getInt( 'limit', 50 );
  98                         $wgOut->redirect( $wgTitle->getLocalURL( "action=history&limit={$limit}&dir=prev" ) );
  99                         return;
 100                 }
 101
 102                 wfRunHooks( 'PageHistoryBeforeList', array( &$this->mArticle ) );
 103
 104                 /**
 105                  * Do the list
 106                  */
 107                 $pager = new PageHistoryPager( $this );
 108                 $this->linesonpage = $pager->getNumRows();
 109                 $wgOut->addHTML(
 110                         $pager->getNavigationBar() .
 111                         $this->beginHistoryList() .
 112                         $pager->getBody() .
 113                         $this->endHistoryList() .
 114                         $pager->getNavigationBar()
 115                 );
 116                 wfProfileOut( $fname );
 117         }
 118
 119         /** @todo document */
 120         function beginHistoryList() {
 121                 global $wgTitle;
 122                 $this->lastdate = '';
 123                 $s = wfMsgExt( 'histlegend', array( 'parse') );
 124                 $s .= '<form action="' . $wgTitle->escapeLocalURL( '-' ) . '" method="get">';
 125                 $prefixedkey = htmlspecialchars($wgTitle->getPrefixedDbKey());
 126
 127                 // The following line is SUPPOSED to have double-quotes around the
 128                 // $prefixedkey variable, because htmlspecialchars() doesn't escape
 129                 // single-quotes.
 130                 //
 131                 // On at least two occasions people have changed it to single-quotes,
 132                 // which creates invalid HTML and incorrect display of the resulting
 133                 // link.
 134                 //
 135                 // Please do not break this a third time. Thank you for your kind
 136                 // consideration and cooperation.
 137                 //
 138                 $s .= "<input type='hidden' name='title' value=\"{$prefixedkey}\" />\n";
 139
 140                 $s .= $this->submitButton();
 141                 $s .= '<ul id="pagehistory">' . "\n";
 142                 return $s;
 143         }
 144
 145         /** @todo document */
 146         function endHistoryList() {
 147                 $s = '</ul>';
 148                 $s .= $this->submitButton( array( 'id' => 'historysubmit' ) );
 149                 $s .= '</form>';
 150                 return $s;
 151         }
 152
 153         /** @todo document */
 154         function submitButton( $bits = array() ) {
 155                 return ( $this->linesonpage > 0 )
 156                         ? wfElement( 'input', array_merge( $bits,
 157                                 array(
 158                                         'class'     => 'historysubmit',
 159                                         'type'      => 'submit',
 160                                         'accesskey' => wfMsg( 'accesskey-compareselectedversions' ),
 161                                         'title'     => wfMsg( 'tooltip-compareselectedversions' ).' ['.wfMsg( 'accesskey-compareselectedversions' ).']',
 162                                         'value'     => wfMsg( 'compareselectedversions' ),
 163                                 ) ) )
 164                         : '';
 165         }
 166
 167         /**
 168          * Returns a row from the history printout.
 169          *
 170          * @todo document some more, and maybe clean up the code (some params redundant?)
 171          *
 172          * @param object $row The database row corresponding to the line (or is it the previous line?).
 173          * @param object $next The database row corresponding to the next line (or is it this one?).
 174          * @param int $counter Apparently a counter of what row number we're at, counted from the top row = 1.
 175          * @param $notificationtimestamp
 176          * @param bool $latest Whether this row corresponds to the page's latest revision.
 177          * @param bool $firstInList Whether this row corresponds to the first displayed on this history page.
 178          * @return string HTML output for the row
 179          */
 180         function historyLine( $row, $next, $counter = '', $notificationtimestamp = false, $latest = false, $firstInList = false ) {
 181                 global $wgUser, $wgLang;
 182                 $rev = new Revision( $row );
 183                 $rev->setTitle( $this->mTitle );
 184
 185                 $s = '<li>';
 186                 $curlink = $this->curLink( $rev, $latest );
 187                 $lastlink = $this->lastLink( $rev, $next, $counter );
 188                 $arbitrary = $this->diffButtons( $rev, $firstInList, $counter );
 189                 $link = $this->revLink( $rev );
 190
 191                 $user = $this->mSkin->userLink( $rev->getUser(), $rev->getUserText() )
 192                                 . $this->mSkin->userToolLinks( $rev->getUser(), $rev->getUserText() );
 193
 194                 $s .= "($curlink) ($lastlink) $arbitrary";
 195
 196                 if( $wgUser->isAllowed( 'deleterevision' ) ) {
 197                         $revdel = SpecialPage::getTitleFor( 'Revisiondelete' );
 198                         if( $firstInList ) {
 199                                 // We don't currently handle well changing the top revision's settings
 200                                 $del = wfMsgHtml( 'rev-delundel' );
 201                         } else if( !$rev->userCan( Revision::DELETED_RESTRICTED ) ) {
 202                         // If revision was hidden from sysops
 203                                 $del = wfMsgHtml( 'rev-delundel' );
 204                         } else {
 205                                 $del = $this->mSkin->makeKnownLinkObj( $revdel,
 206                                         wfMsg( 'rev-delundel' ),
 207                                         'target=' . urlencode( $this->mTitle->getPrefixedDbkey() ) .
 208                                         '&oldid=' . urlencode( $rev->getId() ) );
 209                         }
 210                         $s .= " (<small>$del</small>) ";
 211                 }
 212
 213                 $s .= " $link";
 214                 #getUser is safe, but this avoids making the invalid untargeted contribs links
 215                 if( $row->rev_deleted & Revision::DELETED_USER ) {
 216                         $user = '<span class="history-deleted">' . wfMsg('rev-deleted-user') . '</span>';
 217                 }
 218                 $s .= " <span class='history-user'>$user</span>";
 219
 220                 if( $row->rev_minor_edit ) {
 221                         $s .= ' ' . wfElement( 'span', array( 'class' => 'minor' ), wfMsg( 'minoreditletter') );
 222                 }
 223
 224                 if (!is_null($size = $rev->getSize())) {
 225                         if ($size == 0)
 226                                 $stxt = wfMsgHtml('historyempty');
 227                         else
 228                                 $stxt = wfMsgHtml('historysize', $wgLang->formatNum( $size ) );
 229                         $s .= " <span class=\"history-size\">$stxt</span>";
 230                 }
 231
 232                 #getComment is safe, but this is better formatted
 233                 if( $rev->isDeleted( Revision::DELETED_COMMENT ) ) {
 234                         $s .= " <span class=\"history-deleted\"><span class=\"comment\">" .
 235                         wfMsgHtml( 'rev-deleted-comment' ) . "</span></span>";
 236                 } else {
 237                         $s .= $this->mSkin->revComment( $rev );
 238                 }
 239
 240                 if ($notificationtimestamp && ($row->rev_timestamp >= $notificationtimestamp)) {
 241                         $s .= ' <span class="updatedmarker">' .  wfMsgHtml( 'updatedmarker' ) . '</span>';
 242                 }
 243                 #add blurb about text having been deleted
 244                 if( $row->rev_deleted & Revision::DELETED_TEXT ) {
 245                         $s .= ' ' . wfMsgHtml( 'deletedrev' );
 246                 }
 247
 248                 $tools = array();
 249
 250                 if( $wgUser->isAllowed( 'rollback' ) && $latest ) {
 251                         $tools[] = '<span class="mw-rollback-link">'
 252                                 . $this->mSkin->buildRollbackLink( $rev )
 253                                 . '</span>';
 254                 }
 255
 256                 if ( !is_null( $next ) ) {
 257                         $undolink = $this->mSkin->makeKnownLinkObj(
 258                                 $this->mTitle,
 259                                 wfMsgHtml( 'editundo' ),
 260                                 'action=edit&undoafter=' . $next->rev_id . '&undo=' . $rev->getId()
 261                         );
 262                         $tools[] = "<span class=\"mw-history-undo\">{$undolink}</span>";
 263                 }
 264
 265                 if( $tools ) {
 266                         $s .= ' (' . implode( ' | ', $tools ) . ')';
 267                 }
 268
 269                 wfRunHooks( 'PageHistoryLineEnding', array( &$row , &$s ) );
 270
 271                 $s .= "</li>\n";
 272
 273                 return $s;
 274         }
 275
 276         /** @todo document */
 277         function revLink( $rev ) {
 278                 global $wgLang;
 279                 $date = $wgLang->timeanddate( wfTimestamp(TS_MW, $rev->getTimestamp()), true );
 280                 if( $rev->userCan( Revision::DELETED_TEXT ) ) {
 281                         $link = $this->mSkin->makeKnownLinkObj(
 282                                 $this->mTitle, $date, "oldid=" . $rev->getId() );
 283                 } else {
 284                         $link = $date;
 285                 }
 286                 if( $rev->isDeleted( Revision::DELETED_TEXT ) ) {
 287                         return '<span class="history-deleted">' . $link . '</span>';
 288                 }
 289                 return $link;
 290         }
 291
 292         /** @todo document */
 293         function curLink( $rev, $latest ) {
 294                 $cur = wfMsgExt( 'cur', array( 'escape') );
 295                 if( $latest || !$rev->userCan( Revision::DELETED_TEXT ) ) {
 296                         return $cur;
 297                 } else {
 298                         return $this->mSkin->makeKnownLinkObj(
 299                                 $this->mTitle, $cur,
 300                                 'diff=' . $this->getLatestID() .
 301                                 "&oldid=" . $rev->getId() );
 302                 }
 303         }
 304
 305         /** @todo document */
 306         function lastLink( $rev, $next, $counter ) {
 307                 $last = wfMsgExt( 'last', array( 'escape' ) );
 308                 if ( is_null( $next ) ) {
 309                         # Probably no next row
 310                         return $last;
 311                 } elseif ( $next === 'unknown' ) {
 312                         # Next row probably exists but is unknown, use an oldid=prev link
 313                         return $this->mSkin->makeKnownLinkObj(
 314                                 $this->mTitle,
 315                                 $last,
 316                                 "diff=" . $rev->getId() . "&oldid=prev" );
 317                 } elseif( !$rev->userCan( Revision::DELETED_TEXT ) ) {
 318                         return $last;
 319                 } else {
 320                         return $this->mSkin->makeKnownLinkObj(
 321                                 $this->mTitle,
 322                                 $last,
 323                                 "diff=" . $rev->getId() . "&oldid={$next->rev_id}"
 324                                 /*,
 325                                 '',
 326                                 '',
 327                                 "tabindex={$counter}"*/ );
 328                 }
 329         }
 330
 331         /** @todo document */
 332         function diffButtons( $rev, $firstInList, $counter ) {
 333                 if( $this->linesonpage > 1) {
 334                         $radio = array(
 335                                 'type'  => 'radio',
 336                                 'value' => $rev->getId(),
 337 # do we really need to flood this on every item?
 338 #                               'title' => wfMsgHtml( 'selectolderversionfordiff' )
 339                         );
 340
 341                         if( !$rev->userCan( Revision::DELETED_TEXT ) ) {
 342                                 $radio['disabled'] = 'disabled';
 343                         }
 344
 345                         /** @todo: move title texts to javascript */
 346                         if ( $firstInList ) {
 347                                 $first = wfElement( 'input', array_merge(
 348                                         $radio,
 349                                         array(
 350                                                 'style' => 'visibility:hidden',
 351                                                 'name'  => 'oldid' ) ) );
 352                                 $checkmark = array( 'checked' => 'checked' );
 353                         } else {
 354                                 if( $counter == 2 ) {
 355                                         $checkmark = array( 'checked' => 'checked' );
 356                                 } else {
 357                                         $checkmark = array();
 358                                 }
 359                                 $first = wfElement( 'input', array_merge(
 360                                         $radio,
 361                                         $checkmark,
 362                                         array( 'name'  => 'oldid' ) ) );
 363                                 $checkmark = array();
 364                         }
 365                         $second = wfElement( 'input', array_merge(
 366                                 $radio,
 367                                 $checkmark,
 368                                 array( 'name'  => 'diff' ) ) );
 369                         return $first . $second;
 370                 } else {
 371                         return '';
 372                 }
 373         }
 374
 375         /** @todo document */
 376         function getLatestId() {
 377                 if( is_null( $this->mLatestId ) ) {
 378                         $id = $this->mTitle->getArticleID();
 379                         $db = wfGetDB(DB_SLAVE);
 380                         $this->mLatestId = $db->selectField( 'page',
 381                                 "page_latest",
 382                                 array( 'page_id' => $id ),
 383                                 'PageHistory::getLatestID' );
 384                 }
 385                 return $this->mLatestId;
 386         }
 387
 388         /**
 389          * Fetch an array of revisions, specified by a given limit, offset and
 390          * direction. This is now only used by the feeds. It was previously
 391          * used by the main UI but that's now handled by the pager.
 392          */
 393         function fetchRevisions($limit, $offset, $direction) {
 394                 $fname = 'PageHistory::fetchRevisions';
 395
 396                 $dbr = wfGetDB( DB_SLAVE );
 397
 398                 if ($direction == PageHistory::DIR_PREV)
 399                         list($dirs, $oper) = array("ASC", ">=");
 400                 else /* $direction == PageHistory::DIR_NEXT */
 401                         list($dirs, $oper) = array("DESC", "<=");
 402
 403                 if ($offset)
 404                         $offsets = array("rev_timestamp $oper '$offset'");
 405                 else
 406                         $offsets = array();
 407
 408                 $page_id = $this->mTitle->getArticleID();
 409
 410                 $res = $dbr->select(
 411                         'revision',
 412                         Revision::selectFields(),
 413                         array_merge(array("rev_page=$page_id"), $offsets),
 414                         $fname,
 415                         array('ORDER BY' => "rev_timestamp $dirs",
 416                                 'USE INDEX' => 'page_timestamp', 'LIMIT' => $limit)
 417                         );
 418
 419                 $result = array();
 420                 while (($obj = $dbr->fetchObject($res)) != NULL)
 421                         $result[] = $obj;
 422
 423                 return $result;
 424         }
 425
 426         /** @todo document */
 427         function getNotificationTimestamp() {
 428                 global $wgUser, $wgShowUpdatedMarker;
 429                 $fname = 'PageHistory::getNotficationTimestamp';
 430
 431                 if ($this->mNotificationTimestamp !== NULL)
 432                         return $this->mNotificationTimestamp;
 433
 434                 if ($wgUser->isAnon() || !$wgShowUpdatedMarker)
 435                         return $this->mNotificationTimestamp = false;
 436
 437                 $dbr = wfGetDB(DB_SLAVE);
 438
 439                 $this->mNotificationTimestamp = $dbr->selectField(
 440                         'watchlist',
 441                         'wl_notificationtimestamp',
 442                         array(  'wl_namespace' => $this->mTitle->getNamespace(),
 443                                 'wl_title' => $this->mTitle->getDBkey(),
 444                                 'wl_user' => $wgUser->getID()
 445                         ),
 446                         $fname);
 447
 448                 // Don't use the special value reserved for telling whether the field is filled
 449                 if ( is_null( $this->mNotificationTimestamp ) ) {
 450                         $this->mNotificationTimestamp = false;
 451                 }
 452
 453                 return $this->mNotificationTimestamp;
 454         }
 455
 456         /**
 457          * Output a subscription feed listing recent edits to this page.
 458          * @param string $type
 459          */
 460         function feed( $type ) {
 461                 require_once 'SpecialRecentchanges.php';
 462
 463                 global $wgFeedClasses;
 464                 if( !isset( $wgFeedClasses[$type] ) ) {
 465                         global $wgOut;
 466                         $wgOut->addWikiText( wfMsg( 'feed-invalid' ) );
 467                         return;
 468                 }
 469
 470                 $feed = new $wgFeedClasses[$type](
 471                         $this->mTitle->getPrefixedText() . ' - ' .
 472                                 wfMsgForContent( 'history-feed-title' ),
 473                         wfMsgForContent( 'history-feed-description' ),
 474                         $this->mTitle->getFullUrl( 'action=history' ) );
 475
 476                 $items = $this->fetchRevisions(10, 0, PageHistory::DIR_NEXT);
 477                 $feed->outHeader();
 478                 if( $items ) {
 479                         foreach( $items as $row ) {
 480                                 $feed->outItem( $this->feedItem( $row ) );
 481                         }
 482                 } else {
 483                         $feed->outItem( $this->feedEmpty() );
 484                 }
 485                 $feed->outFooter();
 486         }
 487
 488         function feedEmpty() {
 489                 global $wgOut;
 490                 return new FeedItem(
 491                         wfMsgForContent( 'nohistory' ),
 492                         $wgOut->parse( wfMsgForContent( 'history-feed-empty' ) ),
 493                         $this->mTitle->getFullUrl(),
 494                         wfTimestamp( TS_MW ),
 495                         '',
 496                         $this->mTitle->getTalkPage()->getFullUrl() );
 497         }
 498
 499         /**
 500          * Generate a FeedItem object from a given revision table row
 501          * Borrows Recent Changes' feed generation functions for formatting;
 502          * includes a diff to the previous revision (if any).
 503          *
 504          * @param $row
 505          * @return FeedItem
 506          */
 507         function feedItem( $row ) {
 508                 $rev = new Revision( $row );
 509                 $rev->setTitle( $this->mTitle );
 510                 $text = rcFormatDiffRow( $this->mTitle,
 511                         $this->mTitle->getPreviousRevisionID( $rev->getId() ),
 512                         $rev->getId(),
 513                         $rev->getTimestamp(),
 514                         $rev->getComment() );
 515
 516                 if( $rev->getComment() == '' ) {
 517                         global $wgContLang;
 518                         $title = wfMsgForContent( 'history-feed-item-nocomment',
 519                                 $rev->getUserText(),
 520                                 $wgContLang->timeanddate( $rev->getTimestamp() ) );
 521                 } else {
 522                         $title = $rev->getUserText() . ": " . $this->stripComment( $rev->getComment() );
 523                 }
 524
 525                 return new FeedItem(
 526                         $title,
 527                         $text,
 528                         $this->mTitle->getFullUrl( 'diff=' . $rev->getId() . '&oldid=prev' ),
 529                         $rev->getTimestamp(),
 530                         $rev->getUserText(),
 531                         $this->mTitle->getTalkPage()->getFullUrl() );
 532         }
 533
 534         /**
 535          * Quickie hack... strip out wikilinks to more legible form from the comment.
 536          */
 537         function stripComment( $text ) {
 538                 return preg_replace( '/\[\[([^]]*\|)?([^]]+)\]\]/', '\2', $text );
 539         }
 540 }
 541
 542
 543 /**
 544  * @addtogroup Pager
 545  */
 546 class PageHistoryPager extends ReverseChronologicalPager {
 547         public $mLastRow = false, $mPageHistory;
 548
 549         function __construct( $pageHistory ) {
 550                 parent::__construct();
 551                 $this->mPageHistory = $pageHistory;
 552         }
 553
 554         function getQueryInfo() {
 555                 return array(
 556                         'tables' => 'revision',
 557                         'fields' => Revision::selectFields(),
 558                         'conds' => array('rev_page' => $this->mPageHistory->mTitle->getArticleID() ),
 559                         'options' => array( 'USE INDEX' => 'page_timestamp' )
 560                 );
 561         }
 562
 563         function getIndexField() {
 564                 return 'rev_timestamp';
 565         }
 566
 567         function formatRow( $row ) {
 568                 if ( $this->mLastRow ) {
 569                         $latest = $this->mCounter == 1 && $this->mOffset == '';
 570                         $firstInList = $this->mCounter == 1;
 571                         $s = $this->mPageHistory->historyLine( $this->mLastRow, $row, $this->mCounter++,
 572                                 $this->mPageHistory->getNotificationTimestamp(), $latest, $firstInList );
 573                 } else {
 574                         $s = '';
 575                 }
 576                 $this->mLastRow = $row;
 577                 return $s;
 578         }
 579
 580         function getStartBody() {
 581                 $this->mLastRow = false;
 582                 $this->mCounter = 1;
 583                 return '';
 584         }
 585
 586         function getEndBody() {
 587                 if ( $this->mLastRow ) {
 588                         $latest = $this->mCounter == 1 && $this->mOffset == 0;
 589                         $firstInList = $this->mCounter == 1;
 590                         if ( $this->mIsBackwards ) {
 591                                 # Next row is unknown, but for UI reasons, probably exists if an offset has been specified
 592                                 if ( $this->mOffset == '' ) {
 593                                         $next = null;
 594                                 } else {
 595                                         $next = 'unknown';
 596                                 }
 597                         } else {
 598                                 # The next row is the past-the-end row
 599                                 $next = $this->mPastTheEndRow;
 600                         }
 601                         $s = $this->mPageHistory->historyLine( $this->mLastRow, $next, $this->mCounter++,
 602                                 $this->mPageHistory->getNotificationTimestamp(), $latest, $firstInList );
 603                 } else {
 604                         $s = '';
 605                 }
 606                 return $s;
 607         }
 608 }
 609
 610
 611