includes/PageHistory.php

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