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 include_once ( "SpecialValidate.php" );
  10
  11 define("DIR_PREV", 0);
  12 define("DIR_NEXT", 1);
  13
  14 /**
  15  * This class handles printing the history page for an article.  In order to
  16  * be efficient, it uses timestamps rather than offsets for paging, to avoid
  17  * costly LIMIT,offset queries.
  18  *
  19  * Construct it by passing in an Article, and call $h->history() to print the
  20  * history.
  21  *
  22  * @package MediaWiki
  23  */
  24
  25 class PageHistory {
  26         var $mArticle, $mTitle, $mSkin;
  27         var $lastdate;
  28         var $linesonpage;
  29         var $mNotificationTimestamp;
  30
  31         /**
  32          * Construct a new PageHistory.
  33          *
  34          * @param Article $article
  35          * @returns nothing
  36          */
  37         function PageHistory($article) {
  38                 global $wgUser;
  39
  40                 $this->mArticle =& $article;
  41                 $this->mTitle =& $article->mTitle;
  42                 $this->mNotificationTimestamp = NULL;
  43                 $this->mSkin = $wgUser->getSkin();
  44         }
  45
  46         /**
  47          * Print the history page for an article.
  48          *
  49          * @returns nothing
  50          */
  51         function history() {
  52                 global $wgUser, $wgOut, $wgLang, $wgShowUpdatedMarker, $wgRequest,
  53                         $wgTitle, $wgUseValidation;
  54
  55                 /*
  56                  * Allow client caching.
  57                  */
  58
  59                 if( $wgOut->checkLastModified( $this->mArticle->getTimestamp() ) )
  60                         /* Client cache fresh and headers sent, nothing more to do. */
  61                         return;
  62
  63                 $fname = 'PageHistory::history';
  64                 wfProfileIn( $fname );
  65
  66                 /*
  67                  * Setup page variables.
  68                  */
  69                 $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
  70                 $wgOut->setSubtitle( wfMsg( 'revhistory' ) );
  71                 $wgOut->setArticleFlag( false );
  72                 $wgOut->setArticleRelated( true );
  73                 $wgOut->setRobotpolicy( 'noindex,nofollow' );
  74
  75                 /*
  76                  * Fail if article doesn't exist.
  77                  */
  78                 $id = $this->mTitle->getArticleID();
  79                 if( $id == 0 ) {
  80                         $wgOut->addHTML( wfMsg( 'nohistory' ) );
  81                         wfProfileOut( $fname );
  82                         return;
  83                 }
  84
  85                 /*
  86                  * Extract limit, the number of revisions to show, and
  87                  * offset, the timestamp to begin at, from the URL.
  88                  */
  89                 $limit = $wgRequest->getInt('limit', 50);
  90                 $offset = $wgRequest->getText('offset');
  91
  92                 /* Offset must be an integral. */
  93                 if (!strlen($offset) || !preg_match("/^[0-9]+$/", $offset))
  94                         $offset = 0;
  95
  96                 /*
  97                  * "go=last" means to jump to the last history page.
  98                  */
  99                 if (($gowhere = $wgRequest->getText("go")) !== NULL) {
 100                         switch ($gowhere) {
 101                         case "first":
 102                                 if (($lastid = $this->getLastOffsetForPaging($id, $limit)) === NULL)
 103                                         break;
 104                                 $gourl = $wgTitle->getLocalURL("action=history&limit={$limit}&offset={$lastid}");
 105                                 break;
 106                         default:
 107                                 $gourl = NULL;
 108                         }
 109
 110                         if (!is_null($gourl)) {
 111                                 $wgOut->redirect($gourl);
 112                                 return;
 113                         }
 114                 }
 115
 116                 /*
 117                  * Fetch revisions.
 118                  *
 119                  * If the user clicked "previous", we retrieve the revisions backwards,
 120                  * then reverse them.  This is to avoid needing to know the timestamp of
 121                  * previous revisions when generating the URL.
 122                  */
 123                 $direction = $this->getDirection();
 124                 $revisions = $this->fetchRevisions($limit, $offset, $direction);
 125                 $navbar = $this->makeNavbar($revisions, $offset, $limit, $direction);
 126
 127                 /*
 128                  * We fetch one more revision than needed to get the timestamp of the
 129                  * one after this page (and to know if it exists).
 130                  *
 131                  * linesonpage stores the actual number of lines.
 132                  */
 133                 if (count($revisions) < $limit + 1)
 134                         $this->linesonpage = count($revisions);
 135                 else
 136                         $this->linesonpage = count($revisions) - 1;
 137
 138                 /* Un-reverse revisions */
 139                 if ($direction == DIR_PREV)
 140                         $revisions = array_reverse($revisions);
 141
 142                 /*
 143                  * Print the top navbar.
 144                  */
 145                 $s = $navbar;
 146                 $s .= $this->beginHistoryList();
 147                 $counter = 1;
 148
 149                 /*
 150                  * Print each revision, excluding the one-past-the-end, if any.
 151                  */
 152                 foreach (array_slice($revisions, 0, $limit) as $i => $line) {
 153                         $first = !$i && $offset == 0;
 154                         $next = isset( $revisions[$i + 1] ) ? $revisions[$i + 1 ] : null;
 155                         $s .= $this->historyLine($line, $next, $counter, $this->getNotificationTimestamp(), $first);
 156                 }
 157
 158                 /*
 159                  * End navbar.
 160                 */
 161                 $s .= $this->endHistoryList();
 162                 $s .= $navbar;
 163
 164                 /*
 165                  * Article validation line.
 166                  */
 167                 if ($wgUseValidation)
 168                         $s .= "<p>" . Validation::link2statistics ( $this->mArticle ) . "</p>" ;
 169
 170                 $wgOut->addHTML( $s );
 171                 wfProfileOut( $fname );
 172         }
 173
 174         function beginHistoryList() {
 175                 global $wgTitle;
 176                 $this->lastdate = '';
 177                 $s = '<p>' . wfMsg( 'histlegend' ) . '</p>';
 178                 $s .= '<form action="' . $wgTitle->escapeLocalURL( '-' ) . '" method="get">';
 179                 $prefixedkey = htmlspecialchars($wgTitle->getPrefixedDbKey());
 180                 $s .= "<input type='hidden' name='title' value=\"{$prefixedkey}\" />\n";
 181                 $s .= $this->submitButton();
 182                 $s .= '<ul id="pagehistory">';
 183                 return $s;
 184         }
 185
 186         function endHistoryList() {
 187                 $last = wfMsg( 'last' );
 188
 189                 $s = '</ul>';
 190                 $s .= $this->submitButton( array( 'id' => 'historysubmit' ) );
 191                 $s .= '</form>';
 192                 return $s;
 193         }
 194
 195         function submitButton( $bits = array() ) {
 196                 return ( $this->linesonpage > 0 )
 197                         ? wfElement( 'input', array_merge( $bits,
 198                                 array(
 199                                         'class'     => 'historysubmit',
 200                                         'type'      => 'submit',
 201                                         'accesskey' => wfMsg( 'accesskey-compareselectedversions' ),
 202                                         'title'     => wfMsg( 'tooltip-compareselectedversions' ),
 203                                         'value'     => wfMsg( 'compareselectedversions' ),
 204                                 ) ) )
 205                         : '';
 206         }
 207
 208         function historyLine( $row, $next, $counter = '', $notificationtimestamp = false, $latest = false ) {
 209                 global $wgLang, $wgContLang;
 210
 211                 static $message;
 212                 if( !isset( $message ) ) {
 213                         foreach( explode( ' ', 'cur last selectolderversionfordiff selectnewerversionfordiff minoreditletter' ) as $msg ) {
 214                                 $message[$msg] = wfMsg( $msg );
 215                         }
 216                 }
 217
 218                 $link = $this->revLink( $row );
 219
 220                 if ( 0 == $row->rev_user ) {
 221                         $contribsPage =& Title::makeTitle( NS_SPECIAL, 'Contributions' );
 222                         $ul = $this->mSkin->makeKnownLinkObj( $contribsPage,
 223                                 htmlspecialchars( $row->rev_user_text ),
 224                                 'target=' . urlencode( $row->rev_user_text ) );
 225                 } else {
 226                         $userPage =& Title::makeTitle( NS_USER, $row->rev_user_text );
 227                         $ul = $this->mSkin->makeLinkObj( $userPage , htmlspecialchars( $row->rev_user_text ) );
 228                 }
 229
 230                 $s = '<li>';
 231                 if( $row->rev_deleted ) {
 232                         $s .= '<span class="deleted">';
 233                 }
 234                 $curlink = $this->curLink( $row, $latest );
 235                 $lastlink = $this->lastLink( $row, $next, $counter );
 236                 $arbitrary = $this->diffButtons( $row, $latest, $counter );
 237                 $s .= "({$curlink}) ({$lastlink}) $arbitrary {$link} <span class='user'>{$ul}</span>";
 238
 239                 if( $row->rev_minor_edit ) {
 240                         $s .= ' ' . wfElement( 'span', array( 'class' => 'minor' ), $message['minoreditletter'] );
 241                 }
 242
 243                 $s .= $this->mSkin->commentBlock( $row->rev_comment, $this->mTitle );
 244                 if ($this->getNotificationTimestamp() && ($row->rev_timestamp >= $this->getNotificationTimestamp())) {
 245                         $s .= wfMsg( 'updatedmarker' );
 246                 }
 247                 if( $row->rev_deleted ) {
 248                         $s .= "</span> " . htmlspecialchars( wfMsg( 'deletedrev' ) );
 249                 }
 250                 $s .= '</li>';
 251
 252                 return $s;
 253         }
 254
 255         function revLink( $row ) {
 256                 global $wgUser, $wgLang;
 257                 $date = $wgLang->timeanddate( $row->rev_timestamp, true );
 258                 if( $row->rev_deleted && !$wgUser->isAllowed( 'undelete' ) ) {
 259                         return $date;
 260                 } else {
 261                         return $this->mSkin->makeKnownLinkObj(
 262                                 $this->mTitle,
 263                                 $date,
 264                                 'oldid='.$row->rev_id );
 265                 }
 266         }
 267
 268         function curLink( $row, $latest ) {
 269                 global $wgUser;
 270                 $cur = htmlspecialchars( wfMsg( 'cur' ) );
 271                 if( $latest
 272                         || ( $row->rev_deleted && !$wgUser->isAllowed( 'undelete' ) ) ) {
 273                         return $cur;
 274                 } else {
 275                         return $this->mSkin->makeKnownLinkObj(
 276                                 $this->mTitle,
 277                                 $cur,
 278                                 'diff=0&oldid=' . $row->rev_id );
 279                 }
 280         }
 281
 282         function lastLink( $row, $next, $counter ) {
 283                 global $wgUser;
 284                 $last = htmlspecialchars( wfMsg( 'last' ) );
 285                 if( is_null( $next )
 286                         || ( $row->rev_deleted && !$wgUser->isAllowed( 'undelete' ) ) ) {
 287                         return $last;
 288                 } else {
 289                         return $this->mSkin->makeKnownLinkObj(
 290                           $this->mTitle,
 291                           $last,
 292                           "diff={$row->rev_id}&oldid={$next->rev_id}",
 293                           '',
 294                           '',
 295                           ' tabindex="'.$counter.'"' );
 296                 }
 297         }
 298
 299         function diffButtons( $row, $latest, $counter ) {
 300                 global $wgUser;
 301                 if( $this->linesonpage > 1) {
 302                         $radio = array(
 303                                 'type'  => 'radio',
 304                                 'value' => $row->rev_id,
 305                                 'title' => wfMsg( 'selectolderversionfordiff' )
 306                         );
 307                         if( $row->rev_deleted && !$wgUser->isAllowed( 'undelete' ) ) {
 308                                 $radio['disabled'] = 'disabled';
 309                         }
 310
 311                         # XXX: move title texts to javascript
 312                         if ( $latest ) {
 313                                 $first = wfElement( 'input', array_merge(
 314                                         $radio,
 315                                         array(
 316                                                 'style' => 'visibility:hidden',
 317                                                 'name'  => 'oldid' ) ) );
 318                                 $checkmark = array( 'checked' => 'checked' );
 319                         } else {
 320                                 if( $counter == 2 ) {
 321                                         $checkmark = array( 'checked' => 'checked' );
 322                                 } else {
 323                                         $checkmark = array();
 324                                 }
 325                                 $first = wfElement( 'input', array_merge(
 326                                         $radio,
 327                                         $checkmark,
 328                                         array( 'name'  => 'oldid' ) ) );
 329                                 $checkmark = array();
 330                         }
 331                         $second = wfElement( 'input', array_merge(
 332                                 $radio,
 333                                 $checkmark,
 334                                 array( 'name'  => 'diff' ) ) );
 335                         return $first . $second;
 336                 } else {
 337                         return '';
 338                 }
 339         }
 340
 341         function getFirstOffset($id) {
 342                 $db =& wfGetDB(DB_SLAVE);
 343                 $sql = "SELECT MAX(rev_timestamp) AS lowest FROM revision WHERE rev_page = $id";
 344                 $res = $db->query($sql, "getFirstOffset");
 345                 $obj = $db->fetchObject($res);
 346                 return $obj->lowest;
 347         }
 348
 349         function getLastOffset($id) {
 350                 $db =& wfGetDB(DB_SLAVE);
 351                 $sql = "SELECT MIN(rev_timestamp) AS lowest FROM revision WHERE rev_page = $id";
 352                 $res = $db->query($sql, "getLastOffset");
 353                 $obj = $db->fetchObject($res);
 354                 return $obj->lowest;
 355         }
 356
 357         function getLastOffsetForPaging($id, $step = 50) {
 358                 $db =& wfGetDB(DB_SLAVE);
 359                 $sql = "SELECT rev_timestamp FROM revision WHERE rev_page = $id " .
 360                         "ORDER BY rev_timestamp ASC LIMIT $step";
 361                 $res = $db->query($sql, "getLastOffsetForPaging");
 362                 $n = $db->numRows($res);
 363
 364                 if ($n == 0)
 365                         return NULL;
 366
 367                 while ($n--)
 368                         $obj = $db->fetchObject($res);
 369                 return $obj->rev_timestamp;
 370         }
 371
 372         function getDirection() {
 373                 global $wgRequest;
 374
 375                 if ($wgRequest->getText("dir") == "prev")
 376                         return DIR_PREV;
 377                 else
 378                         return DIR_NEXT;
 379         }
 380
 381         function fetchRevisions($limit, $offset, $direction) {
 382                 global $wgUser, $wgShowUpdatedMarker;
 383
 384                 /* Check one extra row to see whether we need to show 'next' and diff links */
 385                 $limitplus = $limit + 1;
 386
 387                 $namespace = $this->mTitle->getNamespace();
 388                 $title = $this->mTitle->getText();
 389                 $uid = $wgUser->getID();
 390                 $db =& wfGetDB( DB_SLAVE );
 391
 392                 $use_index = $db->useIndexClause( 'page_timestamp' );
 393                 $revision = $db->tableName( 'revision' );
 394
 395                 $limits = $offsets = "";
 396
 397                 if ($direction == DIR_PREV)
 398                         list($dirs, $oper) = array("ASC", ">=");
 399                 else    /* $direction = DIR_NEXT */
 400                         list($dirs, $oper) = array("DESC", "<=");
 401
 402                 if ($offset)
 403                         $offsets .= " AND rev_timestamp $oper '$offset' ";
 404
 405                 if ($limit)
 406                         $limits .= " LIMIT $limitplus ";
 407                 $page_id = $this->mTitle->getArticleID();
 408
 409                 $sql = "SELECT rev_id,rev_user," .
 410                   "rev_comment,rev_user_text,rev_timestamp,rev_minor_edit,rev_deleted ".
 411                   "FROM $revision $use_index " .
 412                   "WHERE rev_page=$page_id " .
 413                   $offsets .
 414                   "ORDER BY rev_timestamp $dirs " .
 415                   $limits;
 416                 $res = $db->query($sql, "PageHistory::fetchRevisions");
 417
 418                 $result = array();
 419                 while (($obj = $db->fetchObject($res)) != NULL)
 420                         $result[] = $obj;
 421 wfdebug("limits=$limits offset=$offsets got=".count($result)."\n");
 422
 423                 return $result;
 424         }
 425
 426         function getNotificationTimestamp() {
 427                 global $wgUser, $wgShowUpdatedMarker;
 428
 429                 if ($this->mNotificationTimestamp !== NULL)
 430                         return $this->mNotificationTimestamp;
 431
 432                 if ($wgUser->getID() == 0 || !$wgShowUpdatedMarker)
 433                         return $this->mNotificationTimestamp = false;
 434
 435                 $db =& wfGetDB(DB_SLAVE);
 436
 437                 $this->mNotificationTimestamp = $db->selectField(
 438                         'watchlist',
 439                         'wl_notificationtimestamp',
 440                         array(  'wl_namespace' => $this->mTitle->getNamespace(),
 441                                 'wl_title' => $this->mTitle->getDBkey(),
 442                                 'wl_user' => $wgUser->getID()
 443                         ),
 444                         "PageHistory::getNotficationTimestamp");
 445
 446                 return $this->mNotificationTimestamp;
 447         }
 448
 449         function makeNavbar($revisions, $offset, $limit, $direction) {
 450                 global $wgTitle, $wgLang;
 451
 452                 $revisions = array_slice($revisions, 0, $limit);
 453
 454                 $abslowts = $this->getLastOffset($this->mTitle->getArticleID());
 455                 $abshights = $this->getFirstOffset($this->mTitle->getArticleID());
 456
 457                 /*
 458                  * When we're displaying previous revisions, we need to reverse
 459                  * the array, because it's queried in reverse order.
 460                  */
 461                 if ($direction == DIR_PREV)
 462                         $revisions = array_reverse($revisions);
 463
 464                 /*
 465                  * lowts is the timestamp of the first revision on this page.
 466                  * hights is the timestamp of the last revision.
 467                  */
 468
 469                 $lowts = $hights = 0;
 470
 471                 if (count($revisions)) {
 472                         $lowts = $revisions[0]->rev_timestamp;
 473                         $hights = $revisions[count($revisions) - 1]->rev_timestamp;
 474                 }
 475
 476                 $firsturl = $wgTitle->escapeLocalURL("action=history&limit={$limit}&go=first");
 477                 $lasturl = $wgTitle->escapeLocalURL("action=history&limit={$limit}");
 478                 $firsttext = wfMsg("histfirst");
 479                 $lasttext = wfMsg("histlast");
 480
 481                 $prevurl = $wgTitle->escapeLocalURL("action=history&dir=prev&offset={$lowts}&limit={$limit}");
 482                 $nexturl = $wgTitle->escapeLocalURL("action=history&offset={$hights}&limit={$limit}");
 483
 484                 $urls = array();
 485                 foreach (array(20, 50, 100, 250, 500) as $num) {
 486                         $urls[] = "<a href=\"".$wgTitle->escapeLocalURL(
 487                                 "action=history&offset={$offset}&limit={$num}")."\">".$wgLang->formatNum($num)."</a>";
 488                 }
 489 wfDebug("lowts=$lowts abslowts=$abslowts\n");
 490                 $bits = implode($urls, ' | ');
 491                 if ($lowts < $abslowts) {
 492                         $prevtext = "<a href=\"$prevurl\">".wfMsg("prevn", $limit)."</a>";
 493                         $lasttext = "<a href=\"$lasturl\">$lasttext</a>";
 494                 } else  $prevtext = wfMsg("prevn", $limit);
 495
 496                 if ($hights < $abshights) {
 497                         $nexttext = "<a href=\"$nexturl\">".wfMsg("nextn", $limit)."</a>";
 498                         $firsttext = "<a href=\"$firsturl\">$firsttext</a>";
 499                 } else  $nexttext = wfMsg("nextn", $limit);
 500
 501                 $firstlast = "($firsttext | $lasttext)";
 502
 503                 return "$firstlast " . wfMsg("viewprevnext", $prevtext, $nexttext, $bits);
 504         }
 505 }
 506
 507 ?>