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 = Title::makeTitle( NS_SPECIAL, '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                 $navbar = $pager->getNavigationBar();
 110                 $wgOut->addHTML(
 111                         $pager->getNavigationBar() .
 112                         $this->beginHistoryList() .
 113                         $pager->getBody() .
 114                         $pager->getNavigationBar() .
 115                         $this->endHistoryList()
 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         /** @todo document */
 169         function historyLine( $row, $next, $counter = '', $notificationtimestamp = false, $latest = false, $firstInList = false ) {
 170                 global $wgUser;
 171                 $rev = new Revision( $row );
 172                 $rev->setTitle( $this->mTitle );
 173
 174                 $s = '<li>';
 175                 $curlink = $this->curLink( $rev, $latest );
 176                 $lastlink = $this->lastLink( $rev, $next, $counter );
 177                 $arbitrary = $this->diffButtons( $rev, $firstInList, $counter );
 178                 $link = $this->revLink( $rev );
 179
 180                 $user = $this->mSkin->userLink( $rev->getUser(), $rev->getUserText() )
 181                                 . $this->mSkin->userToolLinks( $rev->getUser(), $rev->getUserText() );
 182
 183                 $s .= "($curlink) ($lastlink) $arbitrary";
 184
 185                 if( $wgUser->isAllowed( 'deleterevision' ) ) {
 186                         $revdel = Title::makeTitle( NS_SPECIAL, 'Revisiondelete' );
 187                         if( $firstInList ) {
 188                                 // We don't currently handle well changing the top revision's settings
 189                                 $del = wfMsgHtml( 'rev-delundel' );
 190                         } else {
 191                                 $del = $this->mSkin->makeKnownLinkObj( $revdel,
 192                                         wfMsg( 'rev-delundel' ),
 193                                         'target=' . urlencode( $this->mTitle->getPrefixedDbkey() ) .
 194                                         '&oldid=' . urlencode( $rev->getId() ) );
 195                         }
 196                         $s .= "(<small>$del</small>) ";
 197                 }
 198
 199                 $s .= " $link <span class='history-user'>$user</span>";
 200
 201                 if( $row->rev_minor_edit ) {
 202                         $s .= ' ' . wfElement( 'span', array( 'class' => 'minor' ), wfMsg( 'minoreditletter') );
 203                 }
 204
 205                 $s .= $this->mSkin->revComment( $rev );
 206                 if ($notificationtimestamp && ($row->rev_timestamp >= $notificationtimestamp)) {
 207                         $s .= ' <span class="updatedmarker">' .  wfMsgHtml( 'updatedmarker' ) . '</span>';
 208                 }
 209                 if( $row->rev_deleted & Revision::DELETED_TEXT ) {
 210                         $s .= ' ' . wfMsgHtml( 'deletedrev' );
 211                 }
 212                 $s .= "</li>\n";
 213
 214                 return $s;
 215         }
 216
 217         /** @todo document */
 218         function revLink( $rev ) {
 219                 global $wgLang;
 220                 $date = $wgLang->timeanddate( wfTimestamp(TS_MW, $rev->getTimestamp()), true );
 221                 if( $rev->userCan( Revision::DELETED_TEXT ) ) {
 222                         $link = $this->mSkin->makeKnownLinkObj(
 223                                 $this->mTitle, $date, "oldid=" . $rev->getId() );
 224                 } else {
 225                         $link = $date;
 226                 }
 227                 if( $rev->isDeleted( Revision::DELETED_TEXT ) ) {
 228                         return '<span class="history-deleted">' . $link . '</span>';
 229                 }
 230                 return $link;
 231         }
 232
 233         /** @todo document */
 234         function curLink( $rev, $latest ) {
 235                 $cur = wfMsgExt( 'cur', array( 'escape') );
 236                 if( $latest || !$rev->userCan( Revision::DELETED_TEXT ) ) {
 237                         return $cur;
 238                 } else {
 239                         return $this->mSkin->makeKnownLinkObj(
 240                                 $this->mTitle, $cur,
 241                                 'diff=' . $this->getLatestID() .
 242                                 "&oldid=" . $rev->getId() );
 243                 }
 244         }
 245
 246         /** @todo document */
 247         function lastLink( $rev, $next, $counter ) {
 248                 $last = wfMsgExt( 'last', array( 'escape' ) );
 249                 if ( is_null( $next ) ) {
 250                         # Probably no next row
 251                         return $last;
 252                 } elseif ( $next === 'unknown' ) {
 253                         # Next row probably exists but is unknown, use an oldid=prev link
 254                         return $this->mSkin->makeKnownLinkObj(
 255                                 $this->mTitle,
 256                                 $last,
 257                                 "diff=" . $rev->getId() . "&oldid=prev" );
 258                 } elseif( !$rev->userCan( Revision::DELETED_TEXT ) ) {
 259                         return $last;
 260                 } else {
 261                         return $this->mSkin->makeKnownLinkObj(
 262                                 $this->mTitle,
 263                                 $last,
 264                                 "diff=" . $rev->getId() . "&oldid={$next->rev_id}"
 265                                 /*,
 266                                 '',
 267                                 '',
 268                                 "tabindex={$counter}"*/ );
 269                 }
 270         }
 271
 272         /** @todo document */
 273         function diffButtons( $rev, $firstInList, $counter ) {
 274                 if( $this->linesonpage > 1) {
 275                         $radio = array(
 276                                 'type'  => 'radio',
 277                                 'value' => $rev->getId(),
 278 # do we really need to flood this on every item?
 279 #                               'title' => wfMsgHtml( 'selectolderversionfordiff' )
 280                         );
 281
 282                         if( !$rev->userCan( Revision::DELETED_TEXT ) ) {
 283                                 $radio['disabled'] = 'disabled';
 284                         }
 285
 286                         /** @todo: move title texts to javascript */
 287                         if ( $firstInList ) {
 288                                 $first = wfElement( 'input', array_merge(
 289                                         $radio,
 290                                         array(
 291                                                 'style' => 'visibility:hidden',
 292                                                 'name'  => 'oldid' ) ) );
 293                                 $checkmark = array( 'checked' => 'checked' );
 294                         } else {
 295                                 if( $counter == 2 ) {
 296                                         $checkmark = array( 'checked' => 'checked' );
 297                                 } else {
 298                                         $checkmark = array();
 299                                 }
 300                                 $first = wfElement( 'input', array_merge(
 301                                         $radio,
 302                                         $checkmark,
 303                                         array( 'name'  => 'oldid' ) ) );
 304                                 $checkmark = array();
 305                         }
 306                         $second = wfElement( 'input', array_merge(
 307                                 $radio,
 308                                 $checkmark,
 309                                 array( 'name'  => 'diff' ) ) );
 310                         return $first . $second;
 311                 } else {
 312                         return '';
 313                 }
 314         }
 315
 316         /** @todo document */
 317         function getLatestId() {
 318                 if( is_null( $this->mLatestId ) ) {
 319                         $id = $this->mTitle->getArticleID();
 320                         $db =& wfGetDB(DB_SLAVE);
 321                         $this->mLatestId = $db->selectField( 'page',
 322                                 "page_latest",
 323                                 array( 'page_id' => $id ),
 324                                 'PageHistory::getLatestID' );
 325                 }
 326                 return $this->mLatestId;
 327         }
 328
 329         /**
 330          * Fetch an array of revisions, specified by a given limit, offset and
 331          * direction. This is now only used by the feeds. It was previously
 332          * used by the main UI but that's now handled by the pager.
 333          */
 334         function fetchRevisions($limit, $offset, $direction) {
 335                 $fname = 'PageHistory::fetchRevisions';
 336
 337                 $dbr =& wfGetDB( DB_SLAVE );
 338
 339                 if ($direction == PageHistory::DIR_PREV)
 340                         list($dirs, $oper) = array("ASC", ">=");
 341                 else /* $direction == PageHistory::DIR_NEXT */
 342                         list($dirs, $oper) = array("DESC", "<=");
 343
 344                 if ($offset)
 345                         $offsets = array("rev_timestamp $oper '$offset'");
 346                 else
 347                         $offsets = array();
 348
 349                 $page_id = $this->mTitle->getArticleID();
 350
 351                 $res = $dbr->select(
 352                         'revision',
 353                         array('rev_id', 'rev_page', 'rev_text_id', 'rev_user', 'rev_comment', 'rev_user_text',
 354                                 'rev_timestamp', 'rev_minor_edit', 'rev_deleted'),
 355                         array_merge(array("rev_page=$page_id"), $offsets),
 356                         $fname,
 357                         array('ORDER BY' => "rev_timestamp $dirs",
 358                                 'USE INDEX' => 'page_timestamp', 'LIMIT' => $limit)
 359                         );
 360
 361                 $result = array();
 362                 while (($obj = $dbr->fetchObject($res)) != NULL)
 363                         $result[] = $obj;
 364
 365                 return $result;
 366         }
 367
 368         /** @todo document */
 369         function getNotificationTimestamp() {
 370                 global $wgUser, $wgShowUpdatedMarker;
 371                 $fname = 'PageHistory::getNotficationTimestamp';
 372
 373                 if ($this->mNotificationTimestamp !== NULL)
 374                         return $this->mNotificationTimestamp;
 375
 376                 if ($wgUser->isAnon() || !$wgShowUpdatedMarker)
 377                         return $this->mNotificationTimestamp = false;
 378
 379                 $dbr =& wfGetDB(DB_SLAVE);
 380
 381                 $this->mNotificationTimestamp = $dbr->selectField(
 382                         'watchlist',
 383                         'wl_notificationtimestamp',
 384                         array(  'wl_namespace' => $this->mTitle->getNamespace(),
 385                                 'wl_title' => $this->mTitle->getDBkey(),
 386                                 'wl_user' => $wgUser->getID()
 387                         ),
 388                         $fname);
 389
 390                 // Don't use the special value reserved for telling whether the field is filled
 391                 if ( is_null( $this->mNotificationTimestamp ) ) {
 392                         $this->mNotificationTimestamp = false;
 393                 }
 394
 395                 return $this->mNotificationTimestamp;
 396         }
 397
 398         /**
 399          * Output a subscription feed listing recent edits to this page.
 400          * @param string $type
 401          */
 402         function feed( $type ) {
 403                 require_once 'SpecialRecentchanges.php';
 404
 405                 global $wgFeedClasses;
 406                 if( !isset( $wgFeedClasses[$type] ) ) {
 407                         global $wgOut;
 408                         $wgOut->addWikiText( wfMsg( 'feed-invalid' ) );
 409                         return;
 410                 }
 411
 412                 $feed = new $wgFeedClasses[$type](
 413                         $this->mTitle->getPrefixedText() . ' - ' .
 414                                 wfMsgForContent( 'history-feed-title' ),
 415                         wfMsgForContent( 'history-feed-description' ),
 416                         $this->mTitle->getFullUrl( 'action=history' ) );
 417
 418                 $items = $this->fetchRevisions(10, 0, PageHistory::DIR_NEXT);
 419                 $feed->outHeader();
 420                 if( $items ) {
 421                         foreach( $items as $row ) {
 422                                 $feed->outItem( $this->feedItem( $row ) );
 423                         }
 424                 } else {
 425                         $feed->outItem( $this->feedEmpty() );
 426                 }
 427                 $feed->outFooter();
 428         }
 429
 430         function feedEmpty() {
 431                 global $wgOut;
 432                 return new FeedItem(
 433                         wfMsgForContent( 'nohistory' ),
 434                         $wgOut->parse( wfMsgForContent( 'history-feed-empty' ) ),
 435                         $this->mTitle->getFullUrl(),
 436                         wfTimestamp( TS_MW ),
 437                         '',
 438                         $this->mTitle->getTalkPage()->getFullUrl() );
 439         }
 440
 441         /**
 442          * Generate a FeedItem object from a given revision table row
 443          * Borrows Recent Changes' feed generation functions for formatting;
 444          * includes a diff to the previous revision (if any).
 445          *
 446          * @param $row
 447          * @return FeedItem
 448          */
 449         function feedItem( $row ) {
 450                 $rev = new Revision( $row );
 451                 $rev->setTitle( $this->mTitle );
 452                 $text = rcFormatDiffRow( $this->mTitle,
 453                         $this->mTitle->getPreviousRevisionID( $rev->getId() ),
 454                         $rev->getId(),
 455                         $rev->getTimestamp(),
 456                         $rev->getComment() );
 457
 458                 if( $rev->getComment() == '' ) {
 459                         global $wgContLang;
 460                         $title = wfMsgForContent( 'history-feed-item-nocomment',
 461                                 $rev->getUserText(),
 462                                 $wgContLang->timeanddate( $rev->getTimestamp() ) );
 463                 } else {
 464                         $title = $rev->getUserText() . ": " . $this->stripComment( $rev->getComment() );
 465                 }
 466
 467                 return new FeedItem(
 468                         $title,
 469                         $text,
 470                         $this->mTitle->getFullUrl( 'diff=' . $rev->getId() . '&oldid=prev' ),
 471                         $rev->getTimestamp(),
 472                         $rev->getUserText(),
 473                         $this->mTitle->getTalkPage()->getFullUrl() );
 474         }
 475
 476         /**
 477          * Quickie hack... strip out wikilinks to more legible form from the comment.
 478          */
 479         function stripComment( $text ) {
 480                 return preg_replace( '/\[\[([^]]*\|)?([^]]+)\]\]/', '\2', $text );
 481         }
 482 }
 483
 484
 485 class PageHistoryPager extends ReverseChronologicalPager {
 486         public $mLastRow = false, $mPageHistory;
 487
 488         function __construct( $pageHistory ) {
 489                 parent::__construct();
 490                 $this->mPageHistory = $pageHistory;
 491         }
 492
 493         function getQueryInfo() {
 494                 return array(
 495                         'tables' => 'revision',
 496                         'fields' => array('rev_id', 'rev_page', 'rev_text_id', 'rev_user', 'rev_comment', 'rev_user_text',
 497                                 'rev_timestamp', 'rev_minor_edit', 'rev_deleted'),
 498                         'conds' => array('rev_page' => $this->mPageHistory->mTitle->getArticleID() ),
 499                         'options' => array( 'USE INDEX' => 'page_timestamp' )
 500                 );
 501         }
 502
 503         function getIndexField() {
 504                 return 'rev_timestamp';
 505         }
 506
 507         function formatRow( $row ) {
 508                 if ( $this->mLastRow ) {
 509                         $latest = $this->mCounter == 1 && $this->mOffset == '';
 510                         $firstInList = $this->mCounter == 1;
 511                         $s = $this->mPageHistory->historyLine( $this->mLastRow, $row, $this->mCounter++,
 512                                 $this->mPageHistory->getNotificationTimestamp(), $latest, $firstInList );
 513                 } else {
 514                         $s = '';
 515                 }
 516                 $this->mLastRow = $row;
 517                 return $s;
 518         }
 519
 520         function getStartBody() {
 521                 $this->mLastRow = false;
 522                 $this->mCounter = 1;
 523                 $this->mPageHistory->linesonpage = $this->getNumRows();
 524                 return '';
 525         }
 526
 527         function getEndBody() {
 528                 if ( $this->mLastRow ) {
 529                         $latest = $this->mCounter == 1 && $this->mOffset == 0;
 530                         $firstInList = $this->mCounter == 1;
 531                         if ( $this->mIsBackwards ) {
 532                                 # Next row is unknown, but for UI reasons, probably exists if an offset has been specified
 533                                 if ( $this->mOffset == '' ) {
 534                                         $next = null;
 535                                 } else {
 536                                         $next = 'unknown';
 537                                 }
 538                         } else {
 539                                 # The next row is the past-the-end row
 540                                 $next = $this->mPastTheEndRow;
 541                         }
 542                         $s = $this->mPageHistory->historyLine( $this->mLastRow, $next, $this->mCounter++,
 543                                 $this->mPageHistory->getNotificationTimestamp(), $latest, $firstInList );
 544                 } else {
 545                         $s = '';
 546                 }
 547                 return $s;
 548         }
 549 }
 550
 551 ?>