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