includes/ImagePage.php

   1 <?php
   2 /**
   3  * Special handling for file description pages.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  * http://www.gnu.org/copyleft/gpl.html
  19  *
  20  * @file
  21  */
  22
  23 /**
  24  * Class for viewing MediaWiki file description pages
  25  *
  26  * @ingroup Media
  27  */
  28 class ImagePage extends Article {
  29
  30         /**
  31          * @var File
  32          */
  33         private $displayImg;
  34         /**
  35          * @var FileRepo
  36          */
  37         private $repo;
  38         private $fileLoaded;
  39
  40         var $mExtraDescription = false;
  41
  42         /**
  43          * @param $title Title
  44          * @return WikiFilePage
  45          */
  46         protected function newPage( Title $title ) {
  47                 // Overload mPage with a file-specific page
  48                 return new WikiFilePage( $title );
  49         }
  50
  51         /**
  52          * Constructor from a page id
  53          * @param $id Int article ID to load
  54          * @return ImagePage|null
  55          */
  56         public static function newFromID( $id ) {
  57                 $t = Title::newFromID( $id );
  58                 # @todo FIXME: Doesn't inherit right
  59                 return $t == null ? null : new self( $t );
  60                 # return $t == null ? null : new static( $t ); // PHP 5.3
  61         }
  62
  63         /**
  64          * @param $file File:
  65          * @return void
  66          */
  67         public function setFile( $file ) {
  68                 $this->mPage->setFile( $file );
  69                 $this->displayImg = $file;
  70                 $this->fileLoaded = true;
  71         }
  72
  73         protected function loadFile() {
  74                 if ( $this->fileLoaded ) {
  75                         return;
  76                 }
  77                 $this->fileLoaded = true;
  78
  79                 $this->displayImg = $img = false;
  80                 wfRunHooks( 'ImagePageFindFile', array( $this, &$img, &$this->displayImg ) );
  81                 if ( !$img ) { // not set by hook?
  82                         $img = wfFindFile( $this->getTitle() );
  83                         if ( !$img ) {
  84                                 $img = wfLocalFile( $this->getTitle() );
  85                         }
  86                 }
  87                 $this->mPage->setFile( $img );
  88                 if ( !$this->displayImg ) { // not set by hook?
  89                         $this->displayImg = $img;
  90                 }
  91                 $this->repo = $img->getRepo();
  92         }
  93
  94         /**
  95          * Handler for action=render
  96          * Include body text only; none of the image extras
  97          */
  98         public function render() {
  99                 $this->getContext()->getOutput()->setArticleBodyOnly( true );
 100                 parent::view();
 101         }
 102
 103         public function view() {
 104                 global $wgShowEXIF;
 105
 106                 $out = $this->getContext()->getOutput();
 107                 $request = $this->getContext()->getRequest();
 108                 $diff = $request->getVal( 'diff' );
 109                 $diffOnly = $request->getBool( 'diffonly', $this->getContext()->getUser()->getOption( 'diffonly' ) );
 110
 111                 if ( $this->getTitle()->getNamespace() != NS_FILE || ( isset( $diff ) && $diffOnly ) ) {
 112                         parent::view();
 113                         return;
 114                 }
 115
 116                 $this->loadFile();
 117
 118                 if ( $this->getTitle()->getNamespace() == NS_FILE && $this->mPage->getFile()->getRedirected() ) {
 119                         if ( $this->getTitle()->getDBkey() == $this->mPage->getFile()->getName() || isset( $diff ) ) {
 120                                 // mTitle is the same as the redirect target so ask Article
 121                                 // to perform the redirect for us.
 122                                 $request->setVal( 'diffonly', 'true' );
 123                                 parent::view();
 124                                 return;
 125                         } else {
 126                                 // mTitle is not the same as the redirect target so it is
 127                                 // probably the redirect page itself. Fake the redirect symbol
 128                                 $out->setPageTitle( $this->getTitle()->getPrefixedText() );
 129                                 $out->addHTML( $this->viewRedirect( Title::makeTitle( NS_FILE, $this->mPage->getFile()->getName() ),
 130                                         /* $appendSubtitle */ true, /* $forceKnown */ true ) );
 131                                 $this->mPage->doViewUpdates( $this->getContext()->getUser() );
 132                                 return;
 133                         }
 134                 }
 135
 136                 if ( $wgShowEXIF && $this->displayImg->exists() ) {
 137                         // @todo FIXME: Bad interface, see note on MediaHandler::formatMetadata().
 138                         $formattedMetadata = $this->displayImg->formatMetadata();
 139                         $showmeta = $formattedMetadata !== false;
 140                 } else {
 141                         $showmeta = false;
 142                 }
 143
 144                 if ( !$diff && $this->displayImg->exists() ) {
 145                         $out->addHTML( $this->showTOC( $showmeta ) );
 146                 }
 147
 148                 if ( !$diff ) {
 149                         $this->openShowImage();
 150                 }
 151
 152                 # No need to display noarticletext, we use our own message, output in openShowImage()
 153                 if ( $this->mPage->getID() ) {
 154                         # NS_FILE is in the user language, but this section (the actual wikitext)
 155                         # should be in page content language
 156                         $pageLang = $this->getTitle()->getPageLanguage();
 157                         $out->addHTML( Xml::openElement( 'div', array( 'id' => 'mw-imagepage-content',
 158                                 'lang' => $pageLang->getCode(), 'dir' => $pageLang->getDir(),
 159                                 'class' => 'mw-content-'.$pageLang->getDir() ) ) );
 160                         parent::view();
 161                         $out->addHTML( Xml::closeElement( 'div' ) );
 162                 } else {
 163                         # Just need to set the right headers
 164                         $out->setArticleFlag( true );
 165                         $out->setPageTitle( $this->getTitle()->getPrefixedText() );
 166                         $this->mPage->doViewUpdates( $this->getContext()->getUser() );
 167                 }
 168
 169                 # Show shared description, if needed
 170                 if ( $this->mExtraDescription ) {
 171                         $fol = wfMessage( 'shareddescriptionfollows' );
 172                         if ( !$fol->isDisabled() ) {
 173                                 $out->addWikiText( $fol->plain() );
 174                         }
 175                         $out->addHTML( '<div id="shared-image-desc">' . $this->mExtraDescription . "</div>\n" );
 176                 }
 177
 178                 $this->closeShowImage();
 179                 $this->imageHistory();
 180                 // TODO: Cleanup the following
 181
 182                 $out->addHTML( Xml::element( 'h2',
 183                         array( 'id' => 'filelinks' ),
 184                         wfMsg( 'imagelinks' ) ) . "\n" );
 185                 $this->imageDupes();
 186                 # @todo FIXME: For some freaky reason, we can't redirect to foreign images.
 187                 # Yet we return metadata about the target. Definitely an issue in the FileRepo
 188                 $this->imageLinks();
 189
 190                 # Allow extensions to add something after the image links
 191                 $html = '';
 192                 wfRunHooks( 'ImagePageAfterImageLinks', array( $this, &$html ) );
 193                 if ( $html ) {
 194                         $out->addHTML( $html );
 195                 }
 196
 197                 if ( $showmeta ) {
 198                         $out->addHTML( Xml::element( 'h2', array( 'id' => 'metadata' ), wfMsg( 'metadata' ) ) . "\n" );
 199                         $out->addWikiText( $this->makeMetadataTable( $formattedMetadata ) );
 200                         $out->addModules( array( 'mediawiki.action.view.metadata' ) );
 201                 }
 202
 203                 // Add remote Filepage.css
 204                 if( !$this->repo->isLocal() ) {
 205                         $css = $this->repo->getDescriptionStylesheetUrl();
 206                         if ( $css ) {
 207                                 $out->addStyle( $css );
 208                         }
 209                 }
 210                 // always show the local local Filepage.css, bug 29277
 211                 $out->addModuleStyles( 'filepage' );
 212         }
 213
 214         /**
 215          * @return File
 216          */
 217         public function getDisplayedFile() {
 218                 $this->loadFile();
 219                 return $this->displayImg;
 220         }
 221
 222         /**
 223          * Create the TOC
 224          *
 225          * @param $metadata Boolean: whether or not to show the metadata link
 226          * @return String
 227          */
 228         protected function showTOC( $metadata ) {
 229                 $r = array(
 230                         '<li><a href="#file">' . wfMsgHtml( 'file-anchor-link' ) . '</a></li>',
 231                         '<li><a href="#filehistory">' . wfMsgHtml( 'filehist' ) . '</a></li>',
 232                         '<li><a href="#filelinks">' . wfMsgHtml( 'imagelinks' ) . '</a></li>',
 233                 );
 234                 if ( $metadata ) {
 235                         $r[] = '<li><a href="#metadata">' . wfMsgHtml( 'metadata' ) . '</a></li>';
 236                 }
 237
 238                 wfRunHooks( 'ImagePageShowTOC', array( $this, &$r ) );
 239
 240                 return '<ul id="filetoc">' . implode( "\n", $r ) . '</ul>';
 241         }
 242
 243         /**
 244          * Make a table with metadata to be shown in the output page.
 245          *
 246          * @todo FIXME: Bad interface, see note on MediaHandler::formatMetadata().
 247          *
 248          * @param $metadata Array: the array containing the EXIF data
 249          * @return String The metadata table. This is treated as Wikitext (!)
 250          */
 251         protected function makeMetadataTable( $metadata ) {
 252                 $r = "<div class=\"mw-imagepage-section-metadata\">";
 253                 $r .= wfMsgNoTrans( 'metadata-help' );
 254                 $r .= "<table id=\"mw_metadata\" class=\"mw_metadata\">\n";
 255                 foreach ( $metadata as $type => $stuff ) {
 256                         foreach ( $stuff as $v ) {
 257                                 # @todo FIXME: Why is this using escapeId for a class?!
 258                                 $class = Sanitizer::escapeId( $v['id'] );
 259                                 if ( $type == 'collapsed' ) {
 260                                         $class .= ' collapsable';
 261                                 }
 262                                 $r .= "<tr class=\"$class\">\n";
 263                                 $r .= "<th>{$v['name']}</th>\n";
 264                                 $r .= "<td>{$v['value']}</td>\n</tr>";
 265                         }
 266                 }
 267                 $r .= "</table>\n</div>\n";
 268                 return $r;
 269         }
 270
 271         /**
 272          * Overloading Article's getContent method.
 273          *
 274          * Omit noarticletext if sharedupload; text will be fetched from the
 275          * shared upload server if possible.
 276          * @return string
 277          */
 278         public function getContent() {
 279                 $this->loadFile();
 280                 if ( $this->mPage->getFile() && !$this->mPage->getFile()->isLocal() && 0 == $this->getID() ) {
 281                         return '';
 282                 }
 283                 return parent::getContent();
 284         }
 285
 286         protected function openShowImage() {
 287                 global $wgImageLimits, $wgEnableUploads, $wgSend404Code;
 288
 289                 $this->loadFile();
 290                 $out = $this->getContext()->getOutput();
 291                 $user = $this->getContext()->getUser();
 292                 $lang = $this->getContext()->getLanguage();
 293                 $dirmark = $lang->getDirMarkEntity();
 294                 $request = $this->getContext()->getRequest();
 295
 296                 $sizeSel = intval( $user->getOption( 'imagesize' ) );
 297                 if ( !isset( $wgImageLimits[$sizeSel] ) ) {
 298                         $sizeSel = User::getDefaultOption( 'imagesize' );
 299
 300                         // The user offset might still be incorrect, specially if
 301                         // $wgImageLimits got changed (see bug #8858).
 302                         if ( !isset( $wgImageLimits[$sizeSel] ) ) {
 303                                 // Default to the first offset in $wgImageLimits
 304                                 $sizeSel = 0;
 305                         }
 306                 }
 307                 $max = $wgImageLimits[$sizeSel];
 308                 $maxWidth = $max[0];
 309                 $maxHeight = $max[1];
 310
 311                 if ( $this->displayImg->exists() ) {
 312                         # image
 313                         $page = $request->getIntOrNull( 'page' );
 314                         if ( is_null( $page ) ) {
 315                                 $params = array();
 316                                 $page = 1;
 317                         } else {
 318                                 $params = array( 'page' => $page );
 319                         }
 320                         $width_orig = $this->displayImg->getWidth( $page );
 321                         $width = $width_orig;
 322                         $height_orig = $this->displayImg->getHeight( $page );
 323                         $height = $height_orig;
 324
 325                         $longDesc = wfMsg( 'parentheses', $this->displayImg->getLongDesc() );
 326
 327                         wfRunHooks( 'ImageOpenShowImageInlineBefore', array( &$this, &$out ) );
 328
 329                         if ( $this->displayImg->allowInlineDisplay() ) {
 330                                 # image
 331
 332                                 # "Download high res version" link below the image
 333                                 # $msgsize = wfMsgHtml( 'file-info-size', $width_orig, $height_orig, Linker::formatSize( $this->displayImg->getSize() ), $mime );
 334                                 # We'll show a thumbnail of this image
 335                                 if ( $width > $maxWidth || $height > $maxHeight ) {
 336                                         # Calculate the thumbnail size.
 337                                         # First case, the limiting factor is the width, not the height.
 338                                         if ( $width / $height >= $maxWidth / $maxHeight ) {
 339                                                 $height = round( $height * $maxWidth / $width );
 340                                                 $width = $maxWidth;
 341                                                 # Note that $height <= $maxHeight now.
 342                                         } else {
 343                                                 $newwidth = floor( $width * $maxHeight / $height );
 344                                                 $height = round( $height * $newwidth / $width );
 345                                                 $width = $newwidth;
 346                                                 # Note that $height <= $maxHeight now, but might not be identical
 347                                                 # because of rounding.
 348                                         }
 349                                         $msgbig  = wfMsgHtml( 'show-big-image' );
 350                                         $otherSizes = array();
 351                                         foreach ( $wgImageLimits as $size ) {
 352                                                 if ( $size[0] < $width_orig && $size[1] < $height_orig &&
 353                                                                 $size[0] != $width && $size[1] != $height ) {
 354                                                         $otherSizes[] = $this->makeSizeLink( $params, $size[0], $size[1] );
 355                                                 }
 356                                         }
 357                                         $msgsmall = wfMessage( 'show-big-image-preview' )->
 358                                                 rawParams( $this->makeSizeLink( $params, $width, $height ) )->
 359                                                 parse();
 360                                         if ( count( $otherSizes ) && $this->displayImg->getRepo()->canTransformVia404() ) {
 361                                                 $msgsmall .= ' ' .
 362                                                 Html::rawElement( 'span', array( 'class' => 'mw-filepage-other-resolutions' ),
 363                                                         wfMessage( 'show-big-image-other' )->rawParams( $lang->pipeList( $otherSizes ) )->
 364                                                         params( count( $otherSizes ) )->parse()
 365                                                 );
 366                                         }
 367                                 } elseif ( $width == 0 && $height == 0 ){
 368                                         # Some sort of audio file that doesn't have dimensions
 369                                         # Don't output a no hi res message for such a file
 370                                         $msgsmall = '';
 371                                 } else {
 372                                         # Image is small enough to show full size on image page
 373                                         $msgsmall = wfMessage( 'file-nohires' )->parse();
 374                                 }
 375
 376                                 $params['width'] = $width;
 377                                 $params['height'] = $height;
 378                                 $thumbnail = $this->displayImg->transform( $params );
 379
 380                                 $showLink = true;
 381                                 $anchorclose = Html::rawElement( 'div', array( 'class' => 'mw-filepage-resolutioninfo' ), $msgsmall );
 382
 383                                 $isMulti = $this->displayImg->isMultipage() && $this->displayImg->pageCount() > 1;
 384                                 if ( $isMulti ) {
 385                                         $out->addHTML( '<table class="multipageimage"><tr><td>' );
 386                                 }
 387
 388                                 if ( $thumbnail ) {
 389                                         $options = array(
 390                                                 'alt' => $this->displayImg->getTitle()->getPrefixedText(),
 391                                                 'file-link' => true,
 392                                         );
 393                                         $out->addHTML( '<div class="fullImageLink" id="file">' .
 394                                                 $thumbnail->toHtml( $options ) .
 395                                                 $anchorclose . "</div>\n" );
 396                                 }
 397
 398                                 if ( $isMulti ) {
 399                                         $count = $this->displayImg->pageCount();
 400
 401                                         if ( $page > 1 ) {
 402                                                 $label = $out->parse( wfMsg( 'imgmultipageprev' ), false );
 403                                                 $link = Linker::link(
 404                                                         $this->getTitle(),
 405                                                         $label,
 406                                                         array(),
 407                                                         array( 'page' => $page - 1 ),
 408                                                         array( 'known', 'noclasses' )
 409                                                 );
 410                                                 $thumb1 = Linker::makeThumbLinkObj( $this->getTitle(), $this->displayImg, $link, $label, 'none',
 411                                                         array( 'page' => $page - 1 ) );
 412                                         } else {
 413                                                 $thumb1 = '';
 414                                         }
 415
 416                                         if ( $page < $count ) {
 417                                                 $label = wfMsg( 'imgmultipagenext' );
 418                                                 $link = Linker::link(
 419                                                         $this->getTitle(),
 420                                                         $label,
 421                                                         array(),
 422                                                         array( 'page' => $page + 1 ),
 423                                                         array( 'known', 'noclasses' )
 424                                                 );
 425                                                 $thumb2 = Linker::makeThumbLinkObj( $this->getTitle(), $this->displayImg, $link, $label, 'none',
 426                                                         array( 'page' => $page + 1 ) );
 427                                         } else {
 428                                                 $thumb2 = '';
 429                                         }
 430
 431                                         global $wgScript;
 432
 433                                         $formParams = array(
 434                                                 'name' => 'pageselector',
 435                                                 'action' => $wgScript,
 436                                                 'onchange' => 'document.pageselector.submit();',
 437                                         );
 438                                         $options = array();
 439                                         for ( $i = 1; $i <= $count; $i++ ) {
 440                                                 $options[] = Xml::option( $lang->formatNum( $i ), $i, $i == $page );
 441                                         }
 442                                         $select = Xml::tags( 'select',
 443                                                 array( 'id' => 'pageselector', 'name' => 'page' ),
 444                                                 implode( "\n", $options ) );
 445
 446                                         $out->addHTML(
 447                                                 '</td><td><div class="multipageimagenavbox">' .
 448                                                 Xml::openElement( 'form', $formParams ) .
 449                                                 Html::hidden( 'title', $this->getTitle()->getPrefixedDBkey() ) .
 450                                                 wfMsgExt( 'imgmultigoto', array( 'parseinline', 'replaceafter' ), $select ) .
 451                                                 Xml::submitButton( wfMsg( 'imgmultigo' ) ) .
 452                                                 Xml::closeElement( 'form' ) .
 453                                                 "<hr />$thumb1\n$thumb2<br style=\"clear: both\" /></div></td></tr></table>"
 454                                         );
 455                                 }
 456                         } else {
 457                                 # if direct link is allowed but it's not a renderable image, show an icon.
 458                                 if ( $this->displayImg->isSafeFile() ) {
 459                                         $icon = $this->displayImg->iconThumb();
 460
 461                                         $out->addHTML( '<div class="fullImageLink" id="file">' .
 462                                                 $icon->toHtml( array( 'file-link' => true ) ) .
 463                                                 "</div>\n" );
 464                                 }
 465
 466                                 $showLink = true;
 467                         }
 468
 469                         if ( $showLink ) {
 470                                 $filename = wfEscapeWikiText( $this->displayImg->getName() );
 471                                 $linktext = $filename;
 472                                 if ( isset( $msgbig ) ) {
 473                                         $linktext = wfEscapeWikiText( $msgbig );
 474                                 }
 475                                 $medialink = "[[Media:$filename|$linktext]]";
 476
 477                                 if ( !$this->displayImg->isSafeFile() ) {
 478                                         $warning = wfMsgNoTrans( 'mediawarning' );
 479                                         // dirmark is needed here to separate the file name, which
 480                                         // most likely ends in Latin characters, from the description,
 481                                         // which may begin with the file type. In RTL environment
 482                                         // this will get messy.
 483                                         // The dirmark, however, must not be immediately adjacent
 484                                         // to the filename, because it can get copied with it.
 485                                         // See bug 25277.
 486                                         $out->addWikiText( <<<EOT
 487 <div class="fullMedia"><span class="dangerousLink">{$medialink}</span> $dirmark<span class="fileInfo">$longDesc</span></div>
 488 <div class="mediaWarning">$warning</div>
 489 EOT
 490                                                 );
 491                                 } else {
 492                                         $out->addWikiText( <<<EOT
 493 <div class="fullMedia">{$medialink} {$dirmark}<span class="fileInfo">$longDesc</span>
 494 </div>
 495 EOT
 496                                         );
 497                                 }
 498                         }
 499
 500                         if ( !$this->displayImg->isLocal() ) {
 501                                 $this->printSharedImageText();
 502                         }
 503                 } else {
 504                         # Image does not exist
 505                         if ( !$this->getID() ) {
 506                                 # No article exists either
 507                                 # Show deletion log to be consistent with normal articles
 508                                 LogEventsList::showLogExtract(
 509                                         $out,
 510                                         array( 'delete', 'move' ),
 511                                         $this->getTitle()->getPrefixedText(),
 512                                         '',
 513                                         array(  'lim' => 10,
 514                                                 'conds' => array( "log_action != 'revision'" ),
 515                                                 'showIfEmpty' => false,
 516                                                 'msgKey' => array( 'moveddeleted-notice' )
 517                                         )
 518                                 );
 519                         }
 520
 521                         if ( $wgEnableUploads && $user->isAllowed( 'upload' ) ) {
 522                                 // Only show an upload link if the user can upload
 523                                 $uploadTitle = SpecialPage::getTitleFor( 'Upload' );
 524                                 $nofile = array(
 525                                         'filepage-nofile-link',
 526                                         $uploadTitle->getFullURL( array( 'wpDestFile' => $this->mPage->getFile()->getName() ) )
 527                                 );
 528                         } else {
 529                                 $nofile = 'filepage-nofile';
 530                         }
 531                         // Note, if there is an image description page, but
 532                         // no image, then this setRobotPolicy is overriden
 533                         // by Article::View().
 534                         $out->setRobotPolicy( 'noindex,nofollow' );
 535                         $out->wrapWikiMsg( "<div id='mw-imagepage-nofile' class='plainlinks'>\n$1\n</div>", $nofile );
 536                         if ( !$this->getID() && $wgSend404Code ) {
 537                                 // If there is no image, no shared image, and no description page,
 538                                 // output a 404, to be consistent with articles.
 539                                 $request->response()->header( 'HTTP/1.1 404 Not Found' );
 540                         }
 541                 }
 542                 $out->setFileVersion( $this->displayImg );
 543         }
 544
 545         /**
 546          * Creates an thumbnail of specified size and returns an HTML link to it
 547          * @param $params array Scaler parameters
 548          * @param $width int
 549          * @param $height int
 550          * @return string
 551          */
 552         private function makeSizeLink( $params, $width, $height ) {
 553                 $params['width'] = $width;
 554                 $params['height'] = $height;
 555                 $thumbnail = $this->displayImg->transform( $params );
 556                 if ( $thumbnail && !$thumbnail->isError() ) {
 557                         return Html::rawElement( 'a', array(
 558                                 'href' => $thumbnail->getUrl(),
 559                                 'class' => 'mw-thumbnail-link'
 560                                 ), wfMessage( 'show-big-image-size' )->numParams(
 561                                         $thumbnail->getWidth(), $thumbnail->getHeight()
 562                                 )->parse() );
 563                 } else {
 564                         return '';
 565                 }
 566         }
 567
 568         /**
 569          * Show a notice that the file is from a shared repository
 570          */
 571         protected function printSharedImageText() {
 572                 $out = $this->getContext()->getOutput();
 573                 $this->loadFile();
 574
 575                 $descUrl = $this->mPage->getFile()->getDescriptionUrl();
 576                 $descText = $this->mPage->getFile()->getDescriptionText();
 577
 578                 /* Add canonical to head if there is no local page for this shared file */
 579                 if( $descUrl && $this->mPage->getID() == 0 ) {
 580                         $out->addLink( array( 'rel' => 'canonical', 'href' => $descUrl ) );
 581                 }
 582
 583                 $wrap = "<div class=\"sharedUploadNotice\">\n$1\n</div>\n";
 584                 $repo = $this->mPage->getFile()->getRepo()->getDisplayName();
 585
 586                 if ( $descUrl && $descText && wfMsgNoTrans( 'sharedupload-desc-here' ) !== '-'  ) {
 587                         $out->wrapWikiMsg( $wrap, array( 'sharedupload-desc-here', $repo, $descUrl ) );
 588                 } elseif ( $descUrl && wfMsgNoTrans( 'sharedupload-desc-there' ) !== '-' ) {
 589                         $out->wrapWikiMsg( $wrap, array( 'sharedupload-desc-there', $repo, $descUrl ) );
 590                 } else {
 591                         $out->wrapWikiMsg( $wrap, array( 'sharedupload', $repo ), ''/*BACKCOMPAT*/ );
 592                 }
 593
 594                 if ( $descText ) {
 595                         $this->mExtraDescription = $descText;
 596                 }
 597         }
 598
 599         public function getUploadUrl() {
 600                 $this->loadFile();
 601                 $uploadTitle = SpecialPage::getTitleFor( 'Upload' );
 602                 return $uploadTitle->getFullURL( array(
 603                         'wpDestFile' => $this->mPage->getFile()->getName(),
 604                         'wpForReUpload' => 1
 605                  ) );
 606         }
 607
 608         /**
 609          * Print out the various links at the bottom of the image page, e.g. reupload,
 610          * external editing (and instructions link) etc.
 611          */
 612         protected function uploadLinksBox() {
 613                 global $wgEnableUploads, $wgUseExternalEditor;
 614
 615                 if ( !$wgEnableUploads ) {
 616                         return;
 617                 }
 618
 619                 $this->loadFile();
 620                 if ( !$this->mPage->getFile()->isLocal() ) {
 621                         return;
 622                 }
 623
 624                 $out = $this->getContext()->getOutput();
 625                 $out->addHTML( "<br /><ul>\n" );
 626
 627                 # "Upload a new version of this file" link
 628                 if ( UploadBase::userCanReUpload( $this->getContext()->getUser(), $this->mPage->getFile()->name ) ) {
 629                         $ulink = Linker::makeExternalLink( $this->getUploadUrl(), wfMsg( 'uploadnewversion-linktext' ) );
 630                         $out->addHTML( "<li id=\"mw-imagepage-reupload-link\"><div class=\"plainlinks\">{$ulink}</div></li>\n" );
 631                 }
 632
 633                 # External editing link
 634                 if ( $wgUseExternalEditor ) {
 635                         $elink = Linker::link(
 636                                 $this->getTitle(),
 637                                 wfMsgHtml( 'edit-externally' ),
 638                                 array(),
 639                                 array(
 640                                         'action' => 'edit',
 641                                         'externaledit' => 'true',
 642                                         'mode' => 'file'
 643                                 ),
 644                                 array( 'known', 'noclasses' )
 645                         );
 646                         $out->addHTML(
 647                                 '<li id="mw-imagepage-edit-external">' . $elink . ' <small>' .
 648                                 wfMsgExt( 'edit-externally-help', array( 'parseinline' ) ) .
 649                                 "</small></li>\n"
 650                         );
 651                 }
 652
 653                 $out->addHTML( "</ul>\n" );
 654         }
 655
 656         protected function closeShowImage() { } # For overloading
 657
 658         /**
 659          * If the page we've just displayed is in the "Image" namespace,
 660          * we follow it with an upload history of the image and its usage.
 661          */
 662         protected function imageHistory() {
 663                 $this->loadFile();
 664                 $out = $this->getContext()->getOutput();
 665                 $pager = new ImageHistoryPseudoPager( $this );
 666                 $out->addHTML( $pager->getBody() );
 667                 $out->preventClickjacking( $pager->getPreventClickjacking() );
 668
 669                 $this->mPage->getFile()->resetHistory(); // free db resources
 670
 671                 # Exist check because we don't want to show this on pages where an image
 672                 # doesn't exist along with the noimage message, that would suck. -ævar
 673                 if ( $this->mPage->getFile()->exists() ) {
 674                         $this->uploadLinksBox();
 675                 }
 676         }
 677
 678         /**
 679          * @param $target
 680          * @param $limit
 681          * @return ResultWrapper
 682          */
 683         protected function queryImageLinks( $target, $limit ) {
 684                 $dbr = wfGetDB( DB_SLAVE );
 685
 686                 return $dbr->select(
 687                         array( 'imagelinks', 'page' ),
 688                         array( 'page_namespace', 'page_title', 'page_is_redirect', 'il_to' ),
 689                         array( 'il_to' => $target, 'il_from = page_id' ),
 690                         __METHOD__,
 691                         array( 'LIMIT' => $limit + 1, 'ORDER BY' => 'il_from', )
 692                 );
 693         }
 694
 695         protected function imageLinks() {
 696                 $limit = 100;
 697
 698                 $out = $this->getContext()->getOutput();
 699                 $res = $this->queryImageLinks( $this->getTitle()->getDbKey(), $limit + 1);
 700                 $rows = array();
 701                 $redirects = array();
 702                 foreach ( $res as $row ) {
 703                         if ( $row->page_is_redirect ) {
 704                                 $redirects[$row->page_title] = array();
 705                         }
 706                         $rows[] = $row;
 707                 }
 708                 $count = count( $rows );
 709
 710                 $hasMore = $count > $limit;
 711                 if ( !$hasMore && count( $redirects ) ) {
 712                         $res = $this->queryImageLinks( array_keys( $redirects ),
 713                                 $limit - count( $rows ) + 1 );
 714                         foreach ( $res as $row ) {
 715                                 $redirects[$row->il_to][] = $row;
 716                                 $count++;
 717                         }
 718                         $hasMore = ( $res->numRows() + count( $rows ) ) > $limit;
 719                 }
 720
 721                 if ( $count == 0 ) {
 722                         $out->wrapWikiMsg(
 723                                 Html::rawElement( 'div',
 724                                         array( 'id' => 'mw-imagepage-nolinkstoimage' ), "\n$1\n" ),
 725                                 'nolinkstoimage'
 726                         );
 727                         return;
 728                 }
 729
 730                 $out->addHTML( "<div id='mw-imagepage-section-linkstoimage'>\n" );
 731                 if ( !$hasMore ) {
 732                         $out->addWikiMsg( 'linkstoimage', $count );
 733                 } else {
 734                         // More links than the limit. Add a link to [[Special:Whatlinkshere]]
 735                         $out->addWikiMsg( 'linkstoimage-more',
 736                                 $this->getContext()->getLanguage()->formatNum( $limit ),
 737                                 $this->getTitle()->getPrefixedDBkey()
 738                         );
 739                 }
 740
 741                 $out->addHTML(
 742                         Html::openElement( 'ul',
 743                                 array( 'class' => 'mw-imagepage-linkstoimage' ) ) . "\n"
 744                 );
 745                 $count = 0;
 746
 747                 // Sort the list by namespace:title
 748                 usort( $rows, array( $this, 'compare' ) );
 749
 750                 // Create links for every element
 751                 $currentCount = 0;
 752                 foreach( $rows as $element ) {
 753                         $currentCount++;
 754                         if ( $currentCount > $limit ) {
 755                                 break;
 756                         }
 757
 758                         $link = Linker::linkKnown( Title::makeTitle( $element->page_namespace, $element->page_title ) );
 759                         if ( !isset( $redirects[$element->page_title] ) ) {
 760                                 $liContents = $link;
 761                         } else {
 762                                 $ul = "<ul class='mw-imagepage-redirectstofile'>\n";
 763                                 foreach ( $redirects[$element->page_title] as $row ) {
 764                                         $currentCount++;
 765                                         if ( $currentCount > $limit ) {
 766                                                 break;
 767                                         }
 768
 769                                         $link2 = Linker::linkKnown( Title::makeTitle( $row->page_namespace, $row->page_title ) );
 770                                         $ul .= Html::rawElement(
 771                                                 'li',
 772                                                 array( 'id' => 'mw-imagepage-linkstoimage-ns' . $element->page_namespace ),
 773                                                 $link2
 774                                                 ) . "\n";
 775                                 }
 776                                 $ul .= '</ul>';
 777                                 $liContents = wfMessage( 'linkstoimage-redirect' )->rawParams(
 778                                         $link, $ul )->parse();
 779                         }
 780                         $out->addHTML( Html::rawElement(
 781                                         'li',
 782                                         array( 'id' => 'mw-imagepage-linkstoimage-ns' . $element->page_namespace ),
 783                                         $liContents
 784                                 ) . "\n"
 785                         );
 786
 787                 };
 788                 $out->addHTML( Html::closeElement( 'ul' ) . "\n" );
 789                 $res->free();
 790
 791                 // Add a links to [[Special:Whatlinkshere]]
 792                 if ( $count > $limit ) {
 793                         $out->addWikiMsg( 'morelinkstoimage', $this->getTitle()->getPrefixedDBkey() );
 794                 }
 795                 $out->addHTML( Html::closeElement( 'div' ) . "\n" );
 796         }
 797
 798         protected function imageDupes() {
 799                 $this->loadFile();
 800                 $out = $this->getContext()->getOutput();
 801
 802                 $dupes = $this->mPage->getDuplicates();
 803                 if ( count( $dupes ) == 0 ) {
 804                         return;
 805                 }
 806
 807                 $out->addHTML( "<div id='mw-imagepage-section-duplicates'>\n" );
 808                 $out->addWikiMsg( 'duplicatesoffile',
 809                         $this->getContext()->getLanguage()->formatNum( count( $dupes ) ), $this->getTitle()->getDBkey()
 810                 );
 811                 $out->addHTML( "<ul class='mw-imagepage-duplicates'>\n" );
 812
 813                 /**
 814                  * @var $file File
 815                  */
 816                 foreach ( $dupes as $file ) {
 817                         $fromSrc = '';
 818                         if ( $file->isLocal() ) {
 819                                 $link = Linker::link(
 820                                         $file->getTitle(),
 821                                         null,
 822                                         array(),
 823                                         array(),
 824                                         array( 'known', 'noclasses' )
 825                                 );
 826                         } else {
 827                                 $link = Linker::makeExternalLink( $file->getDescriptionUrl(),
 828                                         $file->getTitle()->getPrefixedText() );
 829                                 $fromSrc = wfMsg( 'shared-repo-from', $file->getRepo()->getDisplayName() );
 830                         }
 831                         $out->addHTML( "<li>{$link} {$fromSrc}</li>\n" );
 832                 }
 833                 $out->addHTML( "</ul></div>\n" );
 834         }
 835
 836         /**
 837          * Delete the file, or an earlier version of it
 838          */
 839         public function delete() {
 840                 $file = $this->mPage->getFile();
 841                 if ( !$file->exists() || !$file->isLocal() || $file->getRedirected() ) {
 842                         // Standard article deletion
 843                         parent::delete();
 844                         return;
 845                 }
 846
 847                 $deleter = new FileDeleteForm( $file );
 848                 $deleter->execute();
 849         }
 850
 851         /**
 852          * Display an error with a wikitext description
 853          *
 854          * @param $description String
 855          */
 856         function showError( $description ) {
 857                 $out = $this->getContext()->getOutput();
 858                 $out->setPageTitle( wfMessage( 'internalerror' ) );
 859                 $out->setRobotPolicy( 'noindex,nofollow' );
 860                 $out->setArticleRelated( false );
 861                 $out->enableClientCache( false );
 862                 $out->addWikiText( $description );
 863         }
 864
 865         /**
 866          * Callback for usort() to do link sorts by (namespace, title)
 867          * Function copied from Title::compare()
 868          *
 869          * @param $a object page to compare with
 870          * @param $b object page to compare with
 871          * @return Integer: result of string comparison, or namespace comparison
 872          */
 873         protected function compare( $a, $b ) {
 874                 if ( $a->page_namespace == $b->page_namespace ) {
 875                         return strcmp( $a->page_title, $b->page_title );
 876                 } else {
 877                         return $a->page_namespace - $b->page_namespace;
 878                 }
 879         }
 880 }
 881
 882 /**
 883  * Builds the image revision log shown on image pages
 884  *
 885  * @ingroup Media
 886  */
 887 class ImageHistoryList extends ContextSource {
 888
 889         /**
 890          * @var Title
 891          */
 892         protected $title;
 893
 894         /**
 895          * @var File
 896          */
 897         protected $img;
 898
 899         /**
 900          * @var ImagePage
 901          */
 902         protected $imagePage;
 903
 904         /**
 905          * @var File
 906          */
 907         protected $current;
 908
 909         protected $repo, $showThumb;
 910         protected $preventClickjacking = false;
 911
 912         /**
 913          * @param ImagePage $imagePage
 914          */
 915         public function __construct( $imagePage ) {
 916                 global $wgShowArchiveThumbnails;
 917                 $this->current = $imagePage->getFile();
 918                 $this->img = $imagePage->getDisplayedFile();
 919                 $this->title = $imagePage->getTitle();
 920                 $this->imagePage = $imagePage;
 921                 $this->showThumb = $wgShowArchiveThumbnails && $this->img->canRender();
 922                 $this->setContext( $imagePage->getContext() );
 923         }
 924
 925         /**
 926          * @return ImagePage
 927          */
 928         public function getImagePage() {
 929                 return $this->imagePage;
 930         }
 931
 932         /**
 933          * @return File
 934          */
 935         public function getFile() {
 936                 return $this->img;
 937         }
 938
 939         /**
 940          * @param $navLinks string
 941          * @return string
 942          */
 943         public function beginImageHistoryList( $navLinks = '' ) {
 944                 return Xml::element( 'h2', array( 'id' => 'filehistory' ), wfMsg( 'filehist' ) ) . "\n"
 945                         . "<div id=\"mw-imagepage-section-filehistory\">\n"
 946                         . $this->getOutput()->parse( wfMsgNoTrans( 'filehist-help' ) )
 947                         . $navLinks . "\n"
 948                         . Xml::openElement( 'table', array( 'class' => 'wikitable filehistory' ) ) . "\n"
 949                         . '<tr><td></td>'
 950                         . ( $this->current->isLocal() && ( $this->getUser()->isAllowedAny( 'delete', 'deletedhistory' ) ) ? '<td></td>' : '' )
 951                         . '<th>' . wfMsgHtml( 'filehist-datetime' ) . '</th>'
 952                         . ( $this->showThumb ? '<th>' . wfMsgHtml( 'filehist-thumb' ) . '</th>' : '' )
 953                         . '<th>' . wfMsgHtml( 'filehist-dimensions' ) . '</th>'
 954                         . '<th>' . wfMsgHtml( 'filehist-user' ) . '</th>'
 955                         . '<th>' . wfMsgHtml( 'filehist-comment' ) . '</th>'
 956                         . "</tr>\n";
 957         }
 958
 959         /**
 960          * @param $navLinks string
 961          * @return string
 962          */
 963         public function endImageHistoryList( $navLinks = '' ) {
 964                 return "</table>\n$navLinks\n</div>\n";
 965         }
 966
 967         /**
 968          * @param $iscur
 969          * @param $file File
 970          * @return string
 971          */
 972         public function imageHistoryLine( $iscur, $file ) {
 973                 global $wgContLang;
 974
 975                 $user = $this->getUser();
 976                 $lang = $this->getLanguage();
 977                 $timestamp = wfTimestamp( TS_MW, $file->getTimestamp() );
 978                 $img = $iscur ? $file->getName() : $file->getArchiveName();
 979                 $userId = $file->getUser( 'id' );
 980                 $userText = $file->getUser( 'text' );
 981                 $description = $file->getDescription();
 982
 983                 $local = $this->current->isLocal();
 984                 $row = $selected = '';
 985
 986                 // Deletion link
 987                 if ( $local && ( $user->isAllowedAny( 'delete', 'deletedhistory' ) ) ) {
 988                         $row .= '<td>';
 989                         # Link to remove from history
 990                         if ( $user->isAllowed( 'delete' ) ) {
 991                                 $q = array( 'action' => 'delete' );
 992                                 if ( !$iscur ) {
 993                                         $q['oldimage'] = $img;
 994                                 }
 995                                 $row .= Linker::link(
 996                                         $this->title,
 997                                         wfMsgHtml( $iscur ? 'filehist-deleteall' : 'filehist-deleteone' ),
 998                                         array(), $q, array( 'known' )
 999                                 );
1000                         }
1001                         # Link to hide content. Don't show useless link to people who cannot hide revisions.
1002                         $canHide = $user->isAllowed( 'deleterevision' );
1003                         if ( $canHide || ( $user->isAllowed( 'deletedhistory' ) && $file->getVisibility() ) ) {
1004                                 if ( $user->isAllowed( 'delete' ) ) {
1005                                         $row .= '<br />';
1006                                 }
1007                                 // If file is top revision or locked from this user, don't link
1008                                 if ( $iscur || !$file->userCan( File::DELETED_RESTRICTED ) ) {
1009                                         $del = Linker::revDeleteLinkDisabled( $canHide );
1010                                 } else {
1011                                         list( $ts, ) = explode( '!', $img, 2 );
1012                                         $query = array(
1013                                                 'type'   => 'oldimage',
1014                                                 'target' => $this->title->getPrefixedText(),
1015                                                 'ids'    => $ts,
1016                                         );
1017                                         $del = Linker::revDeleteLink( $query,
1018                                                 $file->isDeleted( File::DELETED_RESTRICTED ), $canHide );
1019                                 }
1020                                 $row .= $del;
1021                         }
1022                         $row .= '</td>';
1023                 }
1024
1025                 // Reversion link/current indicator
1026                 $row .= '<td>';
1027                 if ( $iscur ) {
1028                         $row .= wfMsgHtml( 'filehist-current' );
1029                 } elseif ( $local && $user->isLoggedIn() && $this->title->userCan( 'edit' ) ) {
1030                         if ( $file->isDeleted( File::DELETED_FILE ) ) {
1031                                 $row .= wfMsgHtml( 'filehist-revert' );
1032                         } else {
1033                                 $row .= Linker::link(
1034                                         $this->title,
1035                                         wfMsgHtml( 'filehist-revert' ),
1036                                         array(),
1037                                         array(
1038                                                 'action' => 'revert',
1039                                                 'oldimage' => $img,
1040                                                 'wpEditToken' => $user->getEditToken( $img )
1041                                         ),
1042                                         array( 'known', 'noclasses' )
1043                                 );
1044                         }
1045                 }
1046                 $row .= '</td>';
1047
1048                 // Date/time and image link
1049                 if ( $file->getTimestamp() === $this->img->getTimestamp() ) {
1050                         $selected = "class='filehistory-selected'";
1051                 }
1052                 $row .= "<td $selected style='white-space: nowrap;'>";
1053                 if ( !$file->userCan( File::DELETED_FILE ) ) {
1054                         # Don't link to unviewable files
1055                         $row .= '<span class="history-deleted">' . $lang->timeanddate( $timestamp, true ) . '</span>';
1056                 } elseif ( $file->isDeleted( File::DELETED_FILE ) ) {
1057                         if ( $local ) {
1058                                 $this->preventClickjacking();
1059                                 $revdel = SpecialPage::getTitleFor( 'Revisiondelete' );
1060                                 # Make a link to review the image
1061                                 $url = Linker::link(
1062                                         $revdel,
1063                                         $lang->timeanddate( $timestamp, true ),
1064                                         array(),
1065                                         array(
1066                                                 'target' => $this->title->getPrefixedText(),
1067                                                 'file' => $img,
1068                                                 'token' => $user->getEditToken( $img )
1069                                         ),
1070                                         array( 'known', 'noclasses' )
1071                                 );
1072                         } else {
1073                                 $url = $lang->timeanddate( $timestamp, true );
1074                         }
1075                         $row .= '<span class="history-deleted">' . $url . '</span>';
1076                 } else {
1077                         $url = $iscur ? $this->current->getUrl() : $this->current->getArchiveUrl( $img );
1078                         $row .= Xml::element( 'a', array( 'href' => $url ), $lang->timeanddate( $timestamp, true ) );
1079                 }
1080                 $row .= "</td>";
1081
1082                 // Thumbnail
1083                 if ( $this->showThumb ) {
1084                         $row .= '<td>' . $this->getThumbForLine( $file ) . '</td>';
1085                 }
1086
1087                 // Image dimensions + size
1088                 $row .= '<td>';
1089                 $row .= htmlspecialchars( $file->getDimensionsString() );
1090                 $row .= ' <span style="white-space: nowrap;">(' . Linker::formatSize( $file->getSize() ) . ')</span>';
1091                 $row .= '</td>';
1092
1093                 // Uploading user
1094                 $row .= '<td>';
1095                 // Hide deleted usernames
1096                 if ( $file->isDeleted( File::DELETED_USER ) ) {
1097                         $row .= '<span class="history-deleted">' . wfMsgHtml( 'rev-deleted-user' ) . '</span>';
1098                 } else {
1099                         if ( $local ) {
1100                                 $row .= Linker::userLink( $userId, $userText ) . ' <span style="white-space: nowrap;">' .
1101                                 Linker::userToolLinks( $userId, $userText ) . '</span>';
1102                         } else {
1103                                 $row .= htmlspecialchars( $userText );
1104                         }
1105                 }
1106                 $row .= '</td>';
1107
1108                 // Don't show deleted descriptions
1109                 if ( $file->isDeleted( File::DELETED_COMMENT ) ) {
1110                         $row .= '<td><span class="history-deleted">' . wfMsgHtml( 'rev-deleted-comment' ) . '</span></td>';
1111                 } else {
1112                         $row .= '<td dir="' . $wgContLang->getDir() . '">' . Linker::formatComment( $description, $this->title ) . '</td>';
1113                 }
1114
1115                 $rowClass = null;
1116                 wfRunHooks( 'ImagePageFileHistoryLine', array( $this, $file, &$row, &$rowClass ) );
1117                 $classAttr = $rowClass ? " class='$rowClass'" : '';
1118
1119                 return "<tr{$classAttr}>{$row}</tr>\n";
1120         }
1121
1122         /**
1123          * @param $file File
1124          * @return string
1125          */
1126         protected function getThumbForLine( $file ) {
1127                 $lang = $this->getLanguage();
1128                 if ( $file->allowInlineDisplay() && $file->userCan( File::DELETED_FILE ) && !$file->isDeleted( File::DELETED_FILE ) ) {
1129                         $params = array(
1130                                 'width' => '120',
1131                                 'height' => '120',
1132                         );
1133                         $timestamp = wfTimestamp( TS_MW, $file->getTimestamp() );
1134
1135                         $thumbnail = $file->transform( $params );
1136                         $options = array(
1137                                 'alt' => wfMsg( 'filehist-thumbtext',
1138                                         $lang->timeanddate( $timestamp, true ),
1139                                         $lang->date( $timestamp, true ),
1140                                         $lang->time( $timestamp, true ) ),
1141                                 'file-link' => true,
1142                         );
1143
1144                         if ( !$thumbnail ) {
1145                                 return wfMsgHtml( 'filehist-nothumb' );
1146                         }
1147
1148                         return $thumbnail->toHtml( $options );
1149                 } else {
1150                         return wfMsgHtml( 'filehist-nothumb' );
1151                 }
1152         }
1153
1154         /**
1155          * @param $enable bool
1156          */
1157         protected function preventClickjacking( $enable = true ) {
1158                 $this->preventClickjacking = $enable;
1159         }
1160
1161         /**
1162          * @return bool
1163          */
1164         public function getPreventClickjacking() {
1165                 return $this->preventClickjacking;
1166         }
1167 }
1168
1169 class ImageHistoryPseudoPager extends ReverseChronologicalPager {
1170         protected $preventClickjacking = false;
1171
1172         /**
1173          * @var File
1174          */
1175         protected $mImg;
1176
1177         /**
1178          * @var Title
1179          */
1180         protected $mTitle;
1181
1182         /**
1183          * @param ImagePage $imagePage
1184          */
1185         function __construct( $imagePage ) {
1186                 parent::__construct();
1187                 $this->mImagePage = $imagePage;
1188                 $this->mTitle = clone ( $imagePage->getTitle() );
1189                 $this->mTitle->setFragment( '#filehistory' );
1190                 $this->mImg = null;
1191                 $this->mHist = array();
1192                 $this->mRange = array( 0, 0 ); // display range
1193         }
1194
1195         /**
1196          * @return Title
1197          */
1198         function getTitle() {
1199                 return $this->mTitle;
1200         }
1201
1202         function getQueryInfo() {
1203                 return false;
1204         }
1205
1206         /**
1207          * @return string
1208          */
1209         function getIndexField() {
1210                 return '';
1211         }
1212
1213         /**
1214          * @param $row object
1215          * @return string
1216          */
1217         function formatRow( $row ) {
1218                 return '';
1219         }
1220
1221         /**
1222          * @return string
1223          */
1224         function getBody() {
1225                 $s = '';
1226                 $this->doQuery();
1227                 if ( count( $this->mHist ) ) {
1228                         $list = new ImageHistoryList( $this->mImagePage );
1229                         # Generate prev/next links
1230                         $navLink = $this->getNavigationBar();
1231                         $s = $list->beginImageHistoryList( $navLink );
1232                         // Skip rows there just for paging links
1233                         for ( $i = $this->mRange[0]; $i <= $this->mRange[1]; $i++ ) {
1234                                 $file = $this->mHist[$i];
1235                                 $s .= $list->imageHistoryLine( !$file->isOld(), $file );
1236                         }
1237                         $s .= $list->endImageHistoryList( $navLink );
1238
1239                         if ( $list->getPreventClickjacking() ) {
1240                                 $this->preventClickjacking();
1241                         }
1242                 }
1243                 return $s;
1244         }
1245
1246         function doQuery() {
1247                 if ( $this->mQueryDone ) {
1248                         return;
1249                 }
1250                 $this->mImg = $this->mImagePage->getFile(); // ensure loading
1251                 if ( !$this->mImg->exists() ) {
1252                         return;
1253                 }
1254                 $queryLimit = $this->mLimit + 1; // limit plus extra row
1255                 if ( $this->mIsBackwards ) {
1256                         // Fetch the file history
1257                         $this->mHist = $this->mImg->getHistory( $queryLimit, null, $this->mOffset, false );
1258                         // The current rev may not meet the offset/limit
1259                         $numRows = count( $this->mHist );
1260                         if ( $numRows <= $this->mLimit && $this->mImg->getTimestamp() > $this->mOffset ) {
1261                                 $this->mHist = array_merge( array( $this->mImg ), $this->mHist );
1262                         }
1263                 } else {
1264                         // The current rev may not meet the offset
1265                         if ( !$this->mOffset || $this->mImg->getTimestamp() < $this->mOffset ) {
1266                                 $this->mHist[] = $this->mImg;
1267                         }
1268                         // Old image versions (fetch extra row for nav links)
1269                         $oiLimit = count( $this->mHist ) ? $this->mLimit : $this->mLimit + 1;
1270                         // Fetch the file history
1271                         $this->mHist = array_merge( $this->mHist,
1272                                 $this->mImg->getHistory( $oiLimit, $this->mOffset, null, false ) );
1273                 }
1274                 $numRows = count( $this->mHist ); // Total number of query results
1275                 if ( $numRows ) {
1276                         # Index value of top item in the list
1277                         $firstIndex = $this->mIsBackwards ?
1278                                 $this->mHist[$numRows - 1]->getTimestamp() : $this->mHist[0]->getTimestamp();
1279                         # Discard the extra result row if there is one
1280                         if ( $numRows > $this->mLimit && $numRows > 1 ) {
1281                                 if ( $this->mIsBackwards ) {
1282                                         # Index value of item past the index
1283                                         $this->mPastTheEndIndex = $this->mHist[0]->getTimestamp();
1284                                         # Index value of bottom item in the list
1285                                         $lastIndex = $this->mHist[1]->getTimestamp();
1286                                         # Display range
1287                                         $this->mRange = array( 1, $numRows - 1 );
1288                                 } else {
1289                                         # Index value of item past the index
1290                                         $this->mPastTheEndIndex = $this->mHist[$numRows - 1]->getTimestamp();
1291                                         # Index value of bottom item in the list
1292                                         $lastIndex = $this->mHist[$numRows - 2]->getTimestamp();
1293                                         # Display range
1294                                         $this->mRange = array( 0, $numRows - 2 );
1295                                 }
1296                         } else {
1297                                 # Setting indexes to an empty string means that they will be
1298                                 # omitted if they would otherwise appear in URLs. It just so
1299                                 # happens that this  is the right thing to do in the standard
1300                                 # UI, in all the relevant cases.
1301                                 $this->mPastTheEndIndex = '';
1302                                 # Index value of bottom item in the list
1303                                 $lastIndex = $this->mIsBackwards ?
1304                                         $this->mHist[0]->getTimestamp() : $this->mHist[$numRows - 1]->getTimestamp();
1305                                 # Display range
1306                                 $this->mRange = array( 0, $numRows - 1 );
1307                         }
1308                 } else {
1309                         $firstIndex = '';
1310                         $lastIndex = '';
1311                         $this->mPastTheEndIndex = '';
1312                 }
1313                 if ( $this->mIsBackwards ) {
1314                         $this->mIsFirst = ( $numRows < $queryLimit );
1315                         $this->mIsLast = ( $this->mOffset == '' );
1316                         $this->mLastShown = $firstIndex;
1317                         $this->mFirstShown = $lastIndex;
1318                 } else {
1319                         $this->mIsFirst = ( $this->mOffset == '' );
1320                         $this->mIsLast = ( $numRows < $queryLimit );
1321                         $this->mLastShown = $lastIndex;
1322                         $this->mFirstShown = $firstIndex;
1323                 }
1324                 $this->mQueryDone = true;
1325         }
1326
1327         /**
1328          * @param $enable bool
1329          */
1330         protected function preventClickjacking( $enable = true ) {
1331                 $this->preventClickjacking = $enable;
1332         }
1333
1334         /**
1335          * @return bool
1336          */
1337         public function getPreventClickjacking() {
1338                 return $this->preventClickjacking;
1339         }
1340
1341 }