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()->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
 161             parent::view(); #FIXME: use ContentHandler::makeArticle() !!
 162
 163                         $wgOut->addHTML( Xml::closeElement( 'div' ) );
 164                 } else {
 165                         # Just need to set the right headers
 166                         $out->setArticleFlag( true );
 167                         $out->setPageTitle( $this->getTitle()->getPrefixedText() );
 168                         $this->mPage->doViewUpdates( $this->getContext()->getUser() );
 169                 }
 170
 171                 # Show shared description, if needed
 172                 if ( $this->mExtraDescription ) {
 173                         $fol = wfMessage( 'shareddescriptionfollows' );
 174                         if ( !$fol->isDisabled() ) {
 175                                 $out->addWikiText( $fol->plain() );
 176                         }
 177                         $out->addHTML( '<div id="shared-image-desc">' . $this->mExtraDescription . "</div>\n" );
 178                 }
 179
 180                 $this->closeShowImage();
 181                 $this->imageHistory();
 182                 // TODO: Cleanup the following
 183
 184                 $out->addHTML( Xml::element( 'h2',
 185                         array( 'id' => 'filelinks' ),
 186                         wfMsg( 'imagelinks' ) ) . "\n" );
 187                 $this->imageDupes();
 188                 # @todo FIXME: For some freaky reason, we can't redirect to foreign images.
 189                 # Yet we return metadata about the target. Definitely an issue in the FileRepo
 190                 $this->imageLinks();
 191
 192                 # Allow extensions to add something after the image links
 193                 $html = '';
 194                 wfRunHooks( 'ImagePageAfterImageLinks', array( $this, &$html ) );
 195                 if ( $html ) {
 196                         $out->addHTML( $html );
 197                 }
 198
 199                 if ( $showmeta ) {
 200                         $out->addHTML( Xml::element( 'h2', array( 'id' => 'metadata' ), wfMsg( 'metadata' ) ) . "\n" );
 201                         $out->addWikiText( $this->makeMetadataTable( $formattedMetadata ) );
 202                         $out->addModules( array( 'mediawiki.action.view.metadata' ) );
 203                 }
 204
 205                 // Add remote Filepage.css
 206                 if( !$this->repo->isLocal() ) {
 207                         $css = $this->repo->getDescriptionStylesheetUrl();
 208                         if ( $css ) {
 209                                 $out->addStyle( $css );
 210                         }
 211                 }
 212                 // always show the local local Filepage.css, bug 29277
 213                 $out->addModuleStyles( 'filepage' );
 214         }
 215
 216         /**
 217          * @return File
 218          */
 219         public function getDisplayedFile() {
 220                 $this->loadFile();
 221                 return $this->displayImg;
 222         }
 223
 224         /**
 225          * Create the TOC
 226          *
 227          * @param $metadata Boolean: whether or not to show the metadata link
 228          * @return String
 229          */
 230         protected function showTOC( $metadata ) {
 231                 $r = array(
 232                         '<li><a href="#file">' . wfMsgHtml( 'file-anchor-link' ) . '</a></li>',
 233                         '<li><a href="#filehistory">' . wfMsgHtml( 'filehist' ) . '</a></li>',
 234                         '<li><a href="#filelinks">' . wfMsgHtml( 'imagelinks' ) . '</a></li>',
 235                 );
 236                 if ( $metadata ) {
 237                         $r[] = '<li><a href="#metadata">' . wfMsgHtml( 'metadata' ) . '</a></li>';
 238                 }
 239
 240                 wfRunHooks( 'ImagePageShowTOC', array( $this, &$r ) );
 241
 242                 return '<ul id="filetoc">' . implode( "\n", $r ) . '</ul>';
 243         }
 244
 245         /**
 246          * Make a table with metadata to be shown in the output page.
 247          *
 248          * @todo FIXME: Bad interface, see note on MediaHandler::formatMetadata().
 249          *
 250          * @param $metadata Array: the array containing the EXIF data
 251          * @return String The metadata table. This is treated as Wikitext (!)
 252          */
 253         protected function makeMetadataTable( $metadata ) {
 254                 $r = "<div class=\"mw-imagepage-section-metadata\">";
 255                 $r .= wfMsgNoTrans( 'metadata-help' );
 256                 $r .= "<table id=\"mw_metadata\" class=\"mw_metadata\">\n";
 257                 foreach ( $metadata as $type => $stuff ) {
 258                         foreach ( $stuff as $v ) {
 259                                 # @todo FIXME: Why is this using escapeId for a class?!
 260                                 $class = Sanitizer::escapeId( $v['id'] );
 261                                 if ( $type == 'collapsed' ) {
 262                                         $class .= ' collapsable';
 263                                 }
 264                                 $r .= "<tr class=\"$class\">\n";
 265                                 $r .= "<th>{$v['name']}</th>\n";
 266                                 $r .= "<td>{$v['value']}</td>\n</tr>";
 267                         }
 268                 }
 269                 $r .= "</table>\n</div>\n";
 270                 return $r;
 271         }
 272
 273     /**
 274      * Overloading Article's getContentObject method.
 275      *
 276      * Omit noarticletext if sharedupload; text will be fetched from the
 277      * shared upload server if possible.
 278      * @return string
 279      */
 280     public function getContentObject() {
 281         $this->loadFile();
 282         if ( $this->mPage->getFile() && !$this->mPage->getFile()->isLocal() && 0 == $this->getID() ) {
 283             return null;
 284         }
 285         return parent::getContentObject();
 286     }
 287
 288         protected function openShowImage() {
 289                 global $wgImageLimits, $wgEnableUploads, $wgSend404Code;
 290
 291                 $this->loadFile();
 292                 $out = $this->getContext()->getOutput();
 293                 $user = $this->getContext()->getUser();
 294                 $lang = $this->getContext()->getLanguage();
 295                 $dirmark = $lang->getDirMarkEntity();
 296                 $request = $this->getContext()->getRequest();
 297
 298                 $sizeSel = intval( $user->getOption( 'imagesize' ) );
 299                 if ( !isset( $wgImageLimits[$sizeSel] ) ) {
 300                         $sizeSel = User::getDefaultOption( 'imagesize' );
 301
 302                         // The user offset might still be incorrect, specially if
 303                         // $wgImageLimits got changed (see bug #8858).
 304                         if ( !isset( $wgImageLimits[$sizeSel] ) ) {
 305                                 // Default to the first offset in $wgImageLimits
 306                                 $sizeSel = 0;
 307                         }
 308                 }
 309                 $max = $wgImageLimits[$sizeSel];
 310                 $maxWidth = $max[0];
 311                 $maxHeight = $max[1];
 312
 313                 if ( $this->displayImg->exists() ) {
 314                         # image
 315                         $page = $request->getIntOrNull( 'page' );
 316                         if ( is_null( $page ) ) {
 317                                 $params = array();
 318                                 $page = 1;
 319                         } else {
 320                                 $params = array( 'page' => $page );
 321                         }
 322                         $width_orig = $this->displayImg->getWidth( $page );
 323                         $width = $width_orig;
 324                         $height_orig = $this->displayImg->getHeight( $page );
 325                         $height = $height_orig;
 326
 327                         $longDesc = wfMsg( 'parentheses', $this->displayImg->getLongDesc() );
 328
 329                         wfRunHooks( 'ImageOpenShowImageInlineBefore', array( &$this, &$out ) );
 330
 331                         if ( $this->displayImg->allowInlineDisplay() ) {
 332                                 # image
 333
 334                                 # "Download high res version" link below the image
 335                                 # $msgsize = wfMsgHtml( 'file-info-size', $width_orig, $height_orig, Linker::formatSize( $this->displayImg->getSize() ), $mime );
 336                                 # We'll show a thumbnail of this image
 337                                 if ( $width > $maxWidth || $height > $maxHeight ) {
 338                                         # Calculate the thumbnail size.
 339                                         # First case, the limiting factor is the width, not the height.
 340                                         if ( $width / $height >= $maxWidth / $maxHeight ) {
 341                                                 $height = round( $height * $maxWidth / $width );
 342                                                 $width = $maxWidth;
 343                                                 # Note that $height <= $maxHeight now.
 344                                         } else {
 345                                                 $newwidth = floor( $width * $maxHeight / $height );
 346                                                 $height = round( $height * $newwidth / $width );
 347                                                 $width = $newwidth;
 348                                                 # Note that $height <= $maxHeight now, but might not be identical
 349                                                 # because of rounding.
 350                                         }
 351                                         $msgbig  = wfMsgHtml( 'show-big-image' );
 352                                         $otherSizes = array();
 353                                         foreach ( $wgImageLimits as $size ) {
 354                                                 if ( $size[0] < $width_orig && $size[1] < $height_orig &&
 355                                                                 $size[0] != $width && $size[1] != $height ) {
 356                                                         $otherSizes[] = $this->makeSizeLink( $params, $size[0], $size[1] );
 357                                                 }
 358                                         }
 359                                         $msgsmall = wfMessage( 'show-big-image-preview' )->
 360                                                 rawParams( $this->makeSizeLink( $params, $width, $height ) )->
 361                                                 parse();
 362                                         if ( count( $otherSizes ) && $this->displayImg->getRepo()->canTransformVia404() ) {
 363                                                 $msgsmall .= ' ' .
 364                                                 Html::rawElement( 'span', array( 'class' => 'mw-filepage-other-resolutions' ),
 365                                                         wfMessage( 'show-big-image-other' )->rawParams( $lang->pipeList( $otherSizes ) )->
 366                                                         params( count( $otherSizes ) )->parse()
 367                                                 );
 368                                         }
 369                                 } elseif ( $width == 0 && $height == 0 ){
 370                                         # Some sort of audio file that doesn't have dimensions
 371                                         # Don't output a no hi res message for such a file
 372                                         $msgsmall = '';
 373                                 } else {
 374                                         # Image is small enough to show full size on image page
 375                                         $msgsmall = wfMessage( 'file-nohires' )->parse();
 376                                 }
 377
 378                                 $params['width'] = $width;
 379                                 $params['height'] = $height;
 380                                 $thumbnail = $this->displayImg->transform( $params );
 381
 382                                 $showLink = true;
 383                                 $anchorclose = Html::rawElement( 'div', array( 'class' => 'mw-filepage-resolutioninfo' ), $msgsmall );
 384
 385                                 $isMulti = $this->displayImg->isMultipage() && $this->displayImg->pageCount() > 1;
 386                                 if ( $isMulti ) {
 387                                         $out->addHTML( '<table class="multipageimage"><tr><td>' );
 388                                 }
 389
 390                                 if ( $thumbnail ) {
 391                                         $options = array(
 392                                                 'alt' => $this->displayImg->getTitle()->getPrefixedText(),
 393                                                 'file-link' => true,
 394                                         );
 395                                         $out->addHTML( '<div class="fullImageLink" id="file">' .
 396                                                 $thumbnail->toHtml( $options ) .
 397                                                 $anchorclose . "</div>\n" );
 398                                 }
 399
 400                                 if ( $isMulti ) {
 401                                         $count = $this->displayImg->pageCount();
 402
 403                                         if ( $page > 1 ) {
 404                                                 $label = $out->parse( wfMsg( 'imgmultipageprev' ), false );
 405                                                 $link = Linker::link(
 406                                                         $this->getTitle(),
 407                                                         $label,
 408                                                         array(),
 409                                                         array( 'page' => $page - 1 ),
 410                                                         array( 'known', 'noclasses' )
 411                                                 );
 412                                                 $thumb1 = Linker::makeThumbLinkObj( $this->getTitle(), $this->displayImg, $link, $label, 'none',
 413                                                         array( 'page' => $page - 1 ) );
 414                                         } else {
 415                                                 $thumb1 = '';
 416                                         }
 417
 418                                         if ( $page < $count ) {
 419                                                 $label = wfMsg( 'imgmultipagenext' );
 420                                                 $link = Linker::link(
 421                                                         $this->getTitle(),
 422                                                         $label,
 423                                                         array(),
 424                                                         array( 'page' => $page + 1 ),
 425                                                         array( 'known', 'noclasses' )
 426                                                 );
 427                                                 $thumb2 = Linker::makeThumbLinkObj( $this->getTitle(), $this->displayImg, $link, $label, 'none',
 428                                                         array( 'page' => $page + 1 ) );
 429                                         } else {
 430                                                 $thumb2 = '';
 431                                         }
 432
 433                                         global $wgScript;
 434
 435                                         $formParams = array(
 436                                                 'name' => 'pageselector',
 437                                                 'action' => $wgScript,
 438                                                 'onchange' => 'document.pageselector.submit();',
 439                                         );
 440                                         $options = array();
 441                                         for ( $i = 1; $i <= $count; $i++ ) {
 442                                                 $options[] = Xml::option( $lang->formatNum( $i ), $i, $i == $page );
 443                                         }
 444                                         $select = Xml::tags( 'select',
 445                                                 array( 'id' => 'pageselector', 'name' => 'page' ),
 446                                                 implode( "\n", $options ) );
 447
 448                                         $out->addHTML(
 449                                                 '</td><td><div class="multipageimagenavbox">' .
 450                                                 Xml::openElement( 'form', $formParams ) .
 451                                                 Html::hidden( 'title', $this->getTitle()->getPrefixedDBkey() ) .
 452                                                 wfMsgExt( 'imgmultigoto', array( 'parseinline', 'replaceafter' ), $select ) .
 453                                                 Xml::submitButton( wfMsg( 'imgmultigo' ) ) .
 454                                                 Xml::closeElement( 'form' ) .
 455                                                 "<hr />$thumb1\n$thumb2<br style=\"clear: both\" /></div></td></tr></table>"
 456                                         );
 457                                 }
 458                         } else {
 459                                 # if direct link is allowed but it's not a renderable image, show an icon.
 460                                 if ( $this->displayImg->isSafeFile() ) {
 461                                         $icon = $this->displayImg->iconThumb();
 462
 463                                         $out->addHTML( '<div class="fullImageLink" id="file">' .
 464                                                 $icon->toHtml( array( 'file-link' => true ) ) .
 465                                                 "</div>\n" );
 466                                 }
 467
 468                                 $showLink = true;
 469                         }
 470
 471                         if ( $showLink ) {
 472                                 $filename = wfEscapeWikiText( $this->displayImg->getName() );
 473                                 $linktext = $filename;
 474                                 if ( isset( $msgbig ) ) {
 475                                         $linktext = wfEscapeWikiText( $msgbig );
 476                                 }
 477                                 $medialink = "[[Media:$filename|$linktext]]";
 478
 479                                 if ( !$this->displayImg->isSafeFile() ) {
 480                                         $warning = wfMsgNoTrans( 'mediawarning' );
 481                                         // dirmark is needed here to separate the file name, which
 482                                         // most likely ends in Latin characters, from the description,
 483                                         // which may begin with the file type. In RTL environment
 484                                         // this will get messy.
 485                                         // The dirmark, however, must not be immediately adjacent
 486                                         // to the filename, because it can get copied with it.
 487                                         // See bug 25277.
 488                                         $out->addWikiText( <<<EOT
 489 <div class="fullMedia"><span class="dangerousLink">{$medialink}</span> $dirmark<span class="fileInfo">$longDesc</span></div>
 490 <div class="mediaWarning">$warning</div>
 491 EOT
 492                                                 );
 493                                 } else {
 494                                         $out->addWikiText( <<<EOT
 495 <div class="fullMedia">{$medialink} {$dirmark}<span class="fileInfo">$longDesc</span>
 496 </div>
 497 EOT
 498                                         );
 499                                 }
 500                         }
 501
 502                         if ( !$this->displayImg->isLocal() ) {
 503                                 $this->printSharedImageText();
 504                         }
 505                 } else {
 506                         # Image does not exist
 507                         if ( !$this->getID() ) {
 508                                 # No article exists either
 509                                 # Show deletion log to be consistent with normal articles
 510                                 LogEventsList::showLogExtract(
 511                                         $out,
 512                                         array( 'delete', 'move' ),
 513                                         $this->getTitle()->getPrefixedText(),
 514                                         '',
 515                                         array(  'lim' => 10,
 516                                                 'conds' => array( "log_action != 'revision'" ),
 517                                                 'showIfEmpty' => false,
 518                                                 'msgKey' => array( 'moveddeleted-notice' )
 519                                         )
 520                                 );
 521                         }
 522
 523                         if ( $wgEnableUploads && $user->isAllowed( 'upload' ) ) {
 524                                 // Only show an upload link if the user can upload
 525                                 $uploadTitle = SpecialPage::getTitleFor( 'Upload' );
 526                                 $nofile = array(
 527                                         'filepage-nofile-link',
 528                                         $uploadTitle->getFullURL( array( 'wpDestFile' => $this->mPage->getFile()->getName() ) )
 529                                 );
 530                         } else {
 531                                 $nofile = 'filepage-nofile';
 532                         }
 533                         // Note, if there is an image description page, but
 534                         // no image, then this setRobotPolicy is overriden
 535                         // by Article::View().
 536                         $out->setRobotPolicy( 'noindex,nofollow' );
 537                         $out->wrapWikiMsg( "<div id='mw-imagepage-nofile' class='plainlinks'>\n$1\n</div>", $nofile );
 538                         if ( !$this->getID() && $wgSend404Code ) {
 539                                 // If there is no image, no shared image, and no description page,
 540                                 // output a 404, to be consistent with articles.
 541                                 $request->response()->header( 'HTTP/1.1 404 Not Found' );
 542                         }
 543                 }
 544                 $out->setFileVersion( $this->displayImg );
 545         }
 546
 547         /**
 548          * Creates an thumbnail of specified size and returns an HTML link to it
 549          * @param $params array Scaler parameters
 550          * @param $width int
 551          * @param $height int
 552          * @return string
 553          */
 554         private function makeSizeLink( $params, $width, $height ) {
 555                 $params['width'] = $width;
 556                 $params['height'] = $height;
 557                 $thumbnail = $this->displayImg->transform( $params );
 558                 if ( $thumbnail && !$thumbnail->isError() ) {
 559                         return Html::rawElement( 'a', array(
 560                                 'href' => $thumbnail->getUrl(),
 561                                 'class' => 'mw-thumbnail-link'
 562                                 ), wfMessage( 'show-big-image-size' )->numParams(
 563                                         $thumbnail->getWidth(), $thumbnail->getHeight()
 564                                 )->parse() );
 565                 } else {
 566                         return '';
 567                 }
 568         }
 569
 570         /**
 571          * Show a notice that the file is from a shared repository
 572          */
 573         protected function printSharedImageText() {
 574                 $out = $this->getContext()->getOutput();
 575                 $this->loadFile();
 576
 577                 $descUrl = $this->mPage->getFile()->getDescriptionUrl();
 578                 $descText = $this->mPage->getFile()->getDescriptionText();
 579
 580                 /* Add canonical to head if there is no local page for this shared file */
 581                 if( $descUrl && $this->mPage->getID() == 0 ) {
 582                         $out->addLink( array( 'rel' => 'canonical', 'href' => $descUrl ) );
 583                 }
 584
 585                 $wrap = "<div class=\"sharedUploadNotice\">\n$1\n</div>\n";
 586                 $repo = $this->mPage->getFile()->getRepo()->getDisplayName();
 587
 588                 if ( $descUrl && $descText && wfMsgNoTrans( 'sharedupload-desc-here' ) !== '-'  ) {
 589                         $out->wrapWikiMsg( $wrap, array( 'sharedupload-desc-here', $repo, $descUrl ) );
 590                 } elseif ( $descUrl && wfMsgNoTrans( 'sharedupload-desc-there' ) !== '-' ) {
 591                         $out->wrapWikiMsg( $wrap, array( 'sharedupload-desc-there', $repo, $descUrl ) );
 592                 } else {
 593                         $out->wrapWikiMsg( $wrap, array( 'sharedupload', $repo ), ''/*BACKCOMPAT*/ );
 594                 }
 595
 596                 if ( $descText ) {
 597                         $this->mExtraDescription = $descText;
 598                 }
 599         }
 600
 601         public function getUploadUrl() {
 602                 $this->loadFile();
 603                 $uploadTitle = SpecialPage::getTitleFor( 'Upload' );
 604                 return $uploadTitle->getFullURL( array(
 605                         'wpDestFile' => $this->mPage->getFile()->getName(),
 606                         'wpForReUpload' => 1
 607                  ) );
 608         }
 609
 610         /**
 611          * Print out the various links at the bottom of the image page, e.g. reupload,
 612          * external editing (and instructions link) etc.
 613          */
 614         protected function uploadLinksBox() {
 615                 global $wgEnableUploads, $wgUseExternalEditor;
 616
 617                 if ( !$wgEnableUploads ) {
 618                         return;
 619                 }
 620
 621                 $this->loadFile();
 622                 if ( !$this->mPage->getFile()->isLocal() ) {
 623                         return;
 624                 }
 625
 626                 $out = $this->getContext()->getOutput();
 627                 $out->addHTML( "<br /><ul>\n" );
 628
 629                 # "Upload a new version of this file" link
 630                 if ( UploadBase::userCanReUpload( $this->getContext()->getUser(), $this->mPage->getFile()->name ) ) {
 631                         $ulink = Linker::makeExternalLink( $this->getUploadUrl(), wfMsg( 'uploadnewversion-linktext' ) );
 632                         $out->addHTML( "<li id=\"mw-imagepage-reupload-link\"><div class=\"plainlinks\">{$ulink}</div></li>\n" );
 633                 }
 634
 635                 # External editing link
 636                 if ( $wgUseExternalEditor ) {
 637                         $elink = Linker::link(
 638                                 $this->getTitle(),
 639                                 wfMsgHtml( 'edit-externally' ),
 640                                 array(),
 641                                 array(
 642                                         'action' => 'edit',
 643                                         'externaledit' => 'true',
 644                                         'mode' => 'file'
 645                                 ),
 646                                 array( 'known', 'noclasses' )
 647                         );
 648                         $out->addHTML(
 649                                 '<li id="mw-imagepage-edit-external">' . $elink . ' <small>' .
 650                                 wfMsgExt( 'edit-externally-help', array( 'parseinline' ) ) .
 651                                 "</small></li>\n"
 652                         );
 653                 }
 654
 655                 $out->addHTML( "</ul>\n" );
 656         }
 657
 658         protected function closeShowImage() { } # For overloading
 659
 660         /**
 661          * If the page we've just displayed is in the "Image" namespace,
 662          * we follow it with an upload history of the image and its usage.
 663          */
 664         protected function imageHistory() {
 665                 $this->loadFile();
 666                 $out = $this->getContext()->getOutput();
 667                 $pager = new ImageHistoryPseudoPager( $this );
 668                 $out->addHTML( $pager->getBody() );
 669                 $out->preventClickjacking( $pager->getPreventClickjacking() );
 670
 671                 $this->mPage->getFile()->resetHistory(); // free db resources
 672
 673                 # Exist check because we don't want to show this on pages where an image
 674                 # doesn't exist along with the noimage message, that would suck. -ævar
 675                 if ( $this->mPage->getFile()->exists() ) {
 676                         $this->uploadLinksBox();
 677                 }
 678         }
 679
 680         /**
 681          * @param $target
 682          * @param $limit
 683          * @return ResultWrapper
 684          */
 685         protected function queryImageLinks( $target, $limit ) {
 686                 $dbr = wfGetDB( DB_SLAVE );
 687
 688                 return $dbr->select(
 689                         array( 'imagelinks', 'page' ),
 690                         array( 'page_namespace', 'page_title', 'page_is_redirect', 'il_to' ),
 691                         array( 'il_to' => $target, 'il_from = page_id' ),
 692                         __METHOD__,
 693                         array( 'LIMIT' => $limit + 1, 'ORDER BY' => 'il_from', )
 694                 );
 695         }
 696
 697         protected function imageLinks() {
 698                 $limit = 100;
 699
 700                 $out = $this->getContext()->getOutput();
 701                 $res = $this->queryImageLinks( $this->getTitle()->getDbKey(), $limit + 1);
 702                 $rows = array();
 703                 $redirects = array();
 704                 foreach ( $res as $row ) {
 705                         if ( $row->page_is_redirect ) {
 706                                 $redirects[$row->page_title] = array();
 707                         }
 708                         $rows[] = $row;
 709                 }
 710                 $count = count( $rows );
 711
 712                 $hasMore = $count > $limit;
 713                 if ( !$hasMore && count( $redirects ) ) {
 714                         $res = $this->queryImageLinks( array_keys( $redirects ),
 715                                 $limit - count( $rows ) + 1 );
 716                         foreach ( $res as $row ) {
 717                                 $redirects[$row->il_to][] = $row;
 718                                 $count++;
 719                         }
 720                         $hasMore = ( $res->numRows() + count( $rows ) ) > $limit;
 721                 }
 722
 723                 if ( $count == 0 ) {
 724                         $out->wrapWikiMsg(
 725                                 Html::rawElement( 'div',
 726                                         array( 'id' => 'mw-imagepage-nolinkstoimage' ), "\n$1\n" ),
 727                                 'nolinkstoimage'
 728                         );
 729                         return;
 730                 }
 731
 732                 $out->addHTML( "<div id='mw-imagepage-section-linkstoimage'>\n" );
 733                 if ( !$hasMore ) {
 734                         $out->addWikiMsg( 'linkstoimage', $count );
 735                 } else {
 736                         // More links than the limit. Add a link to [[Special:Whatlinkshere]]
 737                         $out->addWikiMsg( 'linkstoimage-more',
 738                                 $this->getContext()->getLanguage()->formatNum( $limit ),
 739                                 $this->getTitle()->getPrefixedDBkey()
 740                         );
 741                 }
 742
 743                 $out->addHTML(
 744                         Html::openElement( 'ul',
 745                                 array( 'class' => 'mw-imagepage-linkstoimage' ) ) . "\n"
 746                 );
 747                 $count = 0;
 748
 749                 // Sort the list by namespace:title
 750                 usort( $rows, array( $this, 'compare' ) );
 751
 752                 // Create links for every element
 753                 $currentCount = 0;
 754                 foreach( $rows as $element ) {
 755                         $currentCount++;
 756                         if ( $currentCount > $limit ) {
 757                                 break;
 758                         }
 759
 760                         $link = Linker::linkKnown( Title::makeTitle( $element->page_namespace, $element->page_title ) );
 761                         if ( !isset( $redirects[$element->page_title] ) ) {
 762                                 $liContents = $link;
 763                         } else {
 764                                 $ul = "<ul class='mw-imagepage-redirectstofile'>\n";
 765                                 foreach ( $redirects[$element->page_title] as $row ) {
 766                                         $currentCount++;
 767                                         if ( $currentCount > $limit ) {
 768                                                 break;
 769                                         }
 770
 771                                         $link2 = Linker::linkKnown( Title::makeTitle( $row->page_namespace, $row->page_title ) );
 772                                         $ul .= Html::rawElement(
 773                                                 'li',
 774                                                 array( 'id' => 'mw-imagepage-linkstoimage-ns' . $element->page_namespace ),
 775                                                 $link2
 776                                                 ) . "\n";
 777                                 }
 778                                 $ul .= '</ul>';
 779                                 $liContents = wfMessage( 'linkstoimage-redirect' )->rawParams(
 780                                         $link, $ul )->parse();
 781                         }
 782                         $out->addHTML( Html::rawElement(
 783                                         'li',
 784                                         array( 'id' => 'mw-imagepage-linkstoimage-ns' . $element->page_namespace ),
 785                                         $liContents
 786                                 ) . "\n"
 787                         );
 788
 789                 };
 790                 $out->addHTML( Html::closeElement( 'ul' ) . "\n" );
 791                 $res->free();
 792
 793                 // Add a links to [[Special:Whatlinkshere]]
 794                 if ( $count > $limit ) {
 795                         $out->addWikiMsg( 'morelinkstoimage', $this->getTitle()->getPrefixedDBkey() );
 796                 }
 797                 $out->addHTML( Html::closeElement( 'div' ) . "\n" );
 798         }
 799
 800         protected function imageDupes() {
 801                 $this->loadFile();
 802                 $out = $this->getContext()->getOutput();
 803
 804                 $dupes = $this->mPage->getDuplicates();
 805                 if ( count( $dupes ) == 0 ) {
 806                         return;
 807                 }
 808
 809                 $out->addHTML( "<div id='mw-imagepage-section-duplicates'>\n" );
 810                 $out->addWikiMsg( 'duplicatesoffile',
 811                         $this->getContext()->getLanguage()->formatNum( count( $dupes ) ), $this->getTitle()->getDBkey()
 812                 );
 813                 $out->addHTML( "<ul class='mw-imagepage-duplicates'>\n" );
 814
 815                 /**
 816                  * @var $file File
 817                  */
 818                 foreach ( $dupes as $file ) {
 819                         $fromSrc = '';
 820                         if ( $file->isLocal() ) {
 821                                 $link = Linker::link(
 822                                         $file->getTitle(),
 823                                         null,
 824                                         array(),
 825                                         array(),
 826                                         array( 'known', 'noclasses' )
 827                                 );
 828                         } else {
 829                                 $link = Linker::makeExternalLink( $file->getDescriptionUrl(),
 830                                         $file->getTitle()->getPrefixedText() );
 831                                 $fromSrc = wfMsg( 'shared-repo-from', $file->getRepo()->getDisplayName() );
 832                         }
 833                         $out->addHTML( "<li>{$link} {$fromSrc}</li>\n" );
 834                 }
 835                 $out->addHTML( "</ul></div>\n" );
 836         }
 837
 838         /**
 839          * Delete the file, or an earlier version of it
 840          */
 841         public function delete() {
 842                 $file = $this->mPage->getFile();
 843                 if ( !$file->exists() || !$file->isLocal() || $file->getRedirected() ) {
 844                         // Standard article deletion
 845                         parent::delete();
 846                         return;
 847                 }
 848
 849                 $deleter = new FileDeleteForm( $file );
 850                 $deleter->execute();
 851         }
 852
 853         /**
 854          * Display an error with a wikitext description
 855          *
 856          * @param $description String
 857          */
 858         function showError( $description ) {
 859                 $out = $this->getContext()->getOutput();
 860                 $out->setPageTitle( wfMessage( 'internalerror' ) );
 861                 $out->setRobotPolicy( 'noindex,nofollow' );
 862                 $out->setArticleRelated( false );
 863                 $out->enableClientCache( false );
 864                 $out->addWikiText( $description );
 865         }
 866
 867         /**
 868          * Callback for usort() to do link sorts by (namespace, title)
 869          * Function copied from Title::compare()
 870          *
 871          * @param $a object page to compare with
 872          * @param $b object page to compare with
 873          * @return Integer: result of string comparison, or namespace comparison
 874          */
 875         protected function compare( $a, $b ) {
 876                 if ( $a->page_namespace == $b->page_namespace ) {
 877                         return strcmp( $a->page_title, $b->page_title );
 878                 } else {
 879                         return $a->page_namespace - $b->page_namespace;
 880                 }
 881         }
 882 }
 883
 884 /**
 885  * Builds the image revision log shown on image pages
 886  *
 887  * @ingroup Media
 888  */
 889 class ImageHistoryList extends ContextSource {
 890
 891         /**
 892          * @var Title
 893          */
 894         protected $title;
 895
 896         /**
 897          * @var File
 898          */
 899         protected $img;
 900
 901         /**
 902          * @var ImagePage
 903          */
 904         protected $imagePage;
 905
 906         /**
 907          * @var File
 908          */
 909         protected $current;
 910
 911         protected $repo, $showThumb;
 912         protected $preventClickjacking = false;
 913
 914         /**
 915          * @param ImagePage $imagePage
 916          */
 917         public function __construct( $imagePage ) {
 918                 global $wgShowArchiveThumbnails;
 919                 $this->current = $imagePage->getFile();
 920                 $this->img = $imagePage->getDisplayedFile();
 921                 $this->title = $imagePage->getTitle();
 922                 $this->imagePage = $imagePage;
 923                 $this->showThumb = $wgShowArchiveThumbnails && $this->img->canRender();
 924                 $this->setContext( $imagePage->getContext() );
 925         }
 926
 927         /**
 928          * @return ImagePage
 929          */
 930         public function getImagePage() {
 931                 return $this->imagePage;
 932         }
 933
 934         /**
 935          * @return File
 936          */
 937         public function getFile() {
 938                 return $this->img;
 939         }
 940
 941         /**
 942          * @param $navLinks string
 943          * @return string
 944          */
 945         public function beginImageHistoryList( $navLinks = '' ) {
 946                 return Xml::element( 'h2', array( 'id' => 'filehistory' ), wfMsg( 'filehist' ) ) . "\n"
 947                         . "<div id=\"mw-imagepage-section-filehistory\">\n"
 948                         . $this->getOutput()->parse( wfMsgNoTrans( 'filehist-help' ) )
 949                         . $navLinks . "\n"
 950                         . Xml::openElement( 'table', array( 'class' => 'wikitable filehistory' ) ) . "\n"
 951                         . '<tr><td></td>'
 952                         . ( $this->current->isLocal() && ( $this->getUser()->isAllowedAny( 'delete', 'deletedhistory' ) ) ? '<td></td>' : '' )
 953                         . '<th>' . wfMsgHtml( 'filehist-datetime' ) . '</th>'
 954                         . ( $this->showThumb ? '<th>' . wfMsgHtml( 'filehist-thumb' ) . '</th>' : '' )
 955                         . '<th>' . wfMsgHtml( 'filehist-dimensions' ) . '</th>'
 956                         . '<th>' . wfMsgHtml( 'filehist-user' ) . '</th>'
 957                         . '<th>' . wfMsgHtml( 'filehist-comment' ) . '</th>'
 958                         . "</tr>\n";
 959         }
 960
 961         /**
 962          * @param $navLinks string
 963          * @return string
 964          */
 965         public function endImageHistoryList( $navLinks = '' ) {
 966                 return "</table>\n$navLinks\n</div>\n";
 967         }
 968
 969         /**
 970          * @param $iscur
 971          * @param $file File
 972          * @return string
 973          */
 974         public function imageHistoryLine( $iscur, $file ) {
 975                 global $wgContLang;
 976
 977                 $user = $this->getUser();
 978                 $lang = $this->getLanguage();
 979                 $timestamp = wfTimestamp( TS_MW, $file->getTimestamp() );
 980                 $img = $iscur ? $file->getName() : $file->getArchiveName();
 981                 $userId = $file->getUser( 'id' );
 982                 $userText = $file->getUser( 'text' );
 983                 $description = $file->getDescription();
 984
 985                 $local = $this->current->isLocal();
 986                 $row = $selected = '';
 987
 988                 // Deletion link
 989                 if ( $local && ( $user->isAllowedAny( 'delete', 'deletedhistory' ) ) ) {
 990                         $row .= '<td>';
 991                         # Link to remove from history
 992                         if ( $user->isAllowed( 'delete' ) ) {
 993                                 $q = array( 'action' => 'delete' );
 994                                 if ( !$iscur ) {
 995                                         $q['oldimage'] = $img;
 996                                 }
 997                                 $row .= Linker::link(
 998                                         $this->title,
 999                                         wfMsgHtml( $iscur ? 'filehist-deleteall' : 'filehist-deleteone' ),
1000                                         array(), $q, array( 'known' )
1001                                 );
1002                         }
1003                         # Link to hide content. Don't show useless link to people who cannot hide revisions.
1004                         $canHide = $user->isAllowed( 'deleterevision' );
1005                         if ( $canHide || ( $user->isAllowed( 'deletedhistory' ) && $file->getVisibility() ) ) {
1006                                 if ( $user->isAllowed( 'delete' ) ) {
1007                                         $row .= '<br />';
1008                                 }
1009                                 // If file is top revision or locked from this user, don't link
1010                                 if ( $iscur || !$file->userCan( File::DELETED_RESTRICTED ) ) {
1011                                         $del = Linker::revDeleteLinkDisabled( $canHide );
1012                                 } else {
1013                                         list( $ts, ) = explode( '!', $img, 2 );
1014                                         $query = array(
1015                                                 'type'   => 'oldimage',
1016                                                 'target' => $this->title->getPrefixedText(),
1017                                                 'ids'    => $ts,
1018                                         );
1019                                         $del = Linker::revDeleteLink( $query,
1020                                                 $file->isDeleted( File::DELETED_RESTRICTED ), $canHide );
1021                                 }
1022                                 $row .= $del;
1023                         }
1024                         $row .= '</td>';
1025                 }
1026
1027                 // Reversion link/current indicator
1028                 $row .= '<td>';
1029                 if ( $iscur ) {
1030                         $row .= wfMsgHtml( 'filehist-current' );
1031                 } elseif ( $local && $user->isLoggedIn() && $this->title->userCan( 'edit' ) ) {
1032                         if ( $file->isDeleted( File::DELETED_FILE ) ) {
1033                                 $row .= wfMsgHtml( 'filehist-revert' );
1034                         } else {
1035                                 $row .= Linker::link(
1036                                         $this->title,
1037                                         wfMsgHtml( 'filehist-revert' ),
1038                                         array(),
1039                                         array(
1040                                                 'action' => 'revert',
1041                                                 'oldimage' => $img,
1042                                                 'wpEditToken' => $user->getEditToken( $img )
1043                                         ),
1044                                         array( 'known', 'noclasses' )
1045                                 );
1046                         }
1047                 }
1048                 $row .= '</td>';
1049
1050                 // Date/time and image link
1051                 if ( $file->getTimestamp() === $this->img->getTimestamp() ) {
1052                         $selected = "class='filehistory-selected'";
1053                 }
1054                 $row .= "<td $selected style='white-space: nowrap;'>";
1055                 if ( !$file->userCan( File::DELETED_FILE ) ) {
1056                         # Don't link to unviewable files
1057                         $row .= '<span class="history-deleted">' . $lang->timeanddate( $timestamp, true ) . '</span>';
1058                 } elseif ( $file->isDeleted( File::DELETED_FILE ) ) {
1059                         if ( $local ) {
1060                                 $this->preventClickjacking();
1061                                 $revdel = SpecialPage::getTitleFor( 'Revisiondelete' );
1062                                 # Make a link to review the image
1063                                 $url = Linker::link(
1064                                         $revdel,
1065                                         $lang->timeanddate( $timestamp, true ),
1066                                         array(),
1067                                         array(
1068                                                 'target' => $this->title->getPrefixedText(),
1069                                                 'file' => $img,
1070                                                 'token' => $user->getEditToken( $img )
1071                                         ),
1072                                         array( 'known', 'noclasses' )
1073                                 );
1074                         } else {
1075                                 $url = $lang->timeanddate( $timestamp, true );
1076                         }
1077                         $row .= '<span class="history-deleted">' . $url . '</span>';
1078                 } else {
1079                         $url = $iscur ? $this->current->getUrl() : $this->current->getArchiveUrl( $img );
1080                         $row .= Xml::element( 'a', array( 'href' => $url ), $lang->timeanddate( $timestamp, true ) );
1081                 }
1082                 $row .= "</td>";
1083
1084                 // Thumbnail
1085                 if ( $this->showThumb ) {
1086                         $row .= '<td>' . $this->getThumbForLine( $file ) . '</td>';
1087                 }
1088
1089                 // Image dimensions + size
1090                 $row .= '<td>';
1091                 $row .= htmlspecialchars( $file->getDimensionsString() );
1092                 $row .= ' <span style="white-space: nowrap;">(' . Linker::formatSize( $file->getSize() ) . ')</span>';
1093                 $row .= '</td>';
1094
1095                 // Uploading user
1096                 $row .= '<td>';
1097                 // Hide deleted usernames
1098                 if ( $file->isDeleted( File::DELETED_USER ) ) {
1099                         $row .= '<span class="history-deleted">' . wfMsgHtml( 'rev-deleted-user' ) . '</span>';
1100                 } else {
1101                         if ( $local ) {
1102                                 $row .= Linker::userLink( $userId, $userText ) . ' <span style="white-space: nowrap;">' .
1103                                 Linker::userToolLinks( $userId, $userText ) . '</span>';
1104                         } else {
1105                                 $row .= htmlspecialchars( $userText );
1106                         }
1107                 }
1108                 $row .= '</td>';
1109
1110                 // Don't show deleted descriptions
1111                 if ( $file->isDeleted( File::DELETED_COMMENT ) ) {
1112                         $row .= '<td><span class="history-deleted">' . wfMsgHtml( 'rev-deleted-comment' ) . '</span></td>';
1113                 } else {
1114                         $row .= '<td dir="' . $wgContLang->getDir() . '">' . Linker::formatComment( $description, $this->title ) . '</td>';
1115                 }
1116
1117                 $rowClass = null;
1118                 wfRunHooks( 'ImagePageFileHistoryLine', array( $this, $file, &$row, &$rowClass ) );
1119                 $classAttr = $rowClass ? " class='$rowClass'" : '';
1120
1121                 return "<tr{$classAttr}>{$row}</tr>\n";
1122         }
1123
1124         /**
1125          * @param $file File
1126          * @return string
1127          */
1128         protected function getThumbForLine( $file ) {
1129                 $lang = $this->getLanguage();
1130                 if ( $file->allowInlineDisplay() && $file->userCan( File::DELETED_FILE ) && !$file->isDeleted( File::DELETED_FILE ) ) {
1131                         $params = array(
1132                                 'width' => '120',
1133                                 'height' => '120',
1134                         );
1135                         $timestamp = wfTimestamp( TS_MW, $file->getTimestamp() );
1136
1137                         $thumbnail = $file->transform( $params );
1138                         $options = array(
1139                                 'alt' => wfMsg( 'filehist-thumbtext',
1140                                         $lang->timeanddate( $timestamp, true ),
1141                                         $lang->date( $timestamp, true ),
1142                                         $lang->time( $timestamp, true ) ),
1143                                 'file-link' => true,
1144                         );
1145
1146                         if ( !$thumbnail ) {
1147                                 return wfMsgHtml( 'filehist-nothumb' );
1148                         }
1149
1150                         return $thumbnail->toHtml( $options );
1151                 } else {
1152                         return wfMsgHtml( 'filehist-nothumb' );
1153                 }
1154         }
1155
1156         /**
1157          * @param $enable bool
1158          */
1159         protected function preventClickjacking( $enable = true ) {
1160                 $this->preventClickjacking = $enable;
1161         }
1162
1163         /**
1164          * @return bool
1165          */
1166         public function getPreventClickjacking() {
1167                 return $this->preventClickjacking;
1168         }
1169 }
1170
1171 class ImageHistoryPseudoPager extends ReverseChronologicalPager {
1172         protected $preventClickjacking = false;
1173
1174         /**
1175          * @var File
1176          */
1177         protected $mImg;
1178
1179         /**
1180          * @var Title
1181          */
1182         protected $mTitle;
1183
1184         /**
1185          * @param ImagePage $imagePage
1186          */
1187         function __construct( $imagePage ) {
1188                 parent::__construct();
1189                 $this->mImagePage = $imagePage;
1190                 $this->mTitle = clone ( $imagePage->getTitle() );
1191                 $this->mTitle->setFragment( '#filehistory' );
1192                 $this->mImg = null;
1193                 $this->mHist = array();
1194                 $this->mRange = array( 0, 0 ); // display range
1195         }
1196
1197         /**
1198          * @return Title
1199          */
1200         function getTitle() {
1201                 return $this->mTitle;
1202         }
1203
1204         function getQueryInfo() {
1205                 return false;
1206         }
1207
1208         /**
1209          * @return string
1210          */
1211         function getIndexField() {
1212                 return '';
1213         }
1214
1215         /**
1216          * @param $row object
1217          * @return string
1218          */
1219         function formatRow( $row ) {
1220                 return '';
1221         }
1222
1223         /**
1224          * @return string
1225          */
1226         function getBody() {
1227                 $s = '';
1228                 $this->doQuery();
1229                 if ( count( $this->mHist ) ) {
1230                         $list = new ImageHistoryList( $this->mImagePage );
1231                         # Generate prev/next links
1232                         $navLink = $this->getNavigationBar();
1233                         $s = $list->beginImageHistoryList( $navLink );
1234                         // Skip rows there just for paging links
1235                         for ( $i = $this->mRange[0]; $i <= $this->mRange[1]; $i++ ) {
1236                                 $file = $this->mHist[$i];
1237                                 $s .= $list->imageHistoryLine( !$file->isOld(), $file );
1238                         }
1239                         $s .= $list->endImageHistoryList( $navLink );
1240
1241                         if ( $list->getPreventClickjacking() ) {
1242                                 $this->preventClickjacking();
1243                         }
1244                 }
1245                 return $s;
1246         }
1247
1248         function doQuery() {
1249                 if ( $this->mQueryDone ) {
1250                         return;
1251                 }
1252                 $this->mImg = $this->mImagePage->getFile(); // ensure loading
1253                 if ( !$this->mImg->exists() ) {
1254                         return;
1255                 }
1256                 $queryLimit = $this->mLimit + 1; // limit plus extra row
1257                 if ( $this->mIsBackwards ) {
1258                         // Fetch the file history
1259                         $this->mHist = $this->mImg->getHistory( $queryLimit, null, $this->mOffset, false );
1260                         // The current rev may not meet the offset/limit
1261                         $numRows = count( $this->mHist );
1262                         if ( $numRows <= $this->mLimit && $this->mImg->getTimestamp() > $this->mOffset ) {
1263                                 $this->mHist = array_merge( array( $this->mImg ), $this->mHist );
1264                         }
1265                 } else {
1266                         // The current rev may not meet the offset
1267                         if ( !$this->mOffset || $this->mImg->getTimestamp() < $this->mOffset ) {
1268                                 $this->mHist[] = $this->mImg;
1269                         }
1270                         // Old image versions (fetch extra row for nav links)
1271                         $oiLimit = count( $this->mHist ) ? $this->mLimit : $this->mLimit + 1;
1272                         // Fetch the file history
1273                         $this->mHist = array_merge( $this->mHist,
1274                                 $this->mImg->getHistory( $oiLimit, $this->mOffset, null, false ) );
1275                 }
1276                 $numRows = count( $this->mHist ); // Total number of query results
1277                 if ( $numRows ) {
1278                         # Index value of top item in the list
1279                         $firstIndex = $this->mIsBackwards ?
1280                                 $this->mHist[$numRows - 1]->getTimestamp() : $this->mHist[0]->getTimestamp();
1281                         # Discard the extra result row if there is one
1282                         if ( $numRows > $this->mLimit && $numRows > 1 ) {
1283                                 if ( $this->mIsBackwards ) {
1284                                         # Index value of item past the index
1285                                         $this->mPastTheEndIndex = $this->mHist[0]->getTimestamp();
1286                                         # Index value of bottom item in the list
1287                                         $lastIndex = $this->mHist[1]->getTimestamp();
1288                                         # Display range
1289                                         $this->mRange = array( 1, $numRows - 1 );
1290                                 } else {
1291                                         # Index value of item past the index
1292                                         $this->mPastTheEndIndex = $this->mHist[$numRows - 1]->getTimestamp();
1293                                         # Index value of bottom item in the list
1294                                         $lastIndex = $this->mHist[$numRows - 2]->getTimestamp();
1295                                         # Display range
1296                                         $this->mRange = array( 0, $numRows - 2 );
1297                                 }
1298                         } else {
1299                                 # Setting indexes to an empty string means that they will be
1300                                 # omitted if they would otherwise appear in URLs. It just so
1301                                 # happens that this  is the right thing to do in the standard
1302                                 # UI, in all the relevant cases.
1303                                 $this->mPastTheEndIndex = '';
1304                                 # Index value of bottom item in the list
1305                                 $lastIndex = $this->mIsBackwards ?
1306                                         $this->mHist[0]->getTimestamp() : $this->mHist[$numRows - 1]->getTimestamp();
1307                                 # Display range
1308                                 $this->mRange = array( 0, $numRows - 1 );
1309                         }
1310                 } else {
1311                         $firstIndex = '';
1312                         $lastIndex = '';
1313                         $this->mPastTheEndIndex = '';
1314                 }
1315                 if ( $this->mIsBackwards ) {
1316                         $this->mIsFirst = ( $numRows < $queryLimit );
1317                         $this->mIsLast = ( $this->mOffset == '' );
1318                         $this->mLastShown = $firstIndex;
1319                         $this->mFirstShown = $lastIndex;
1320                 } else {
1321                         $this->mIsFirst = ( $this->mOffset == '' );
1322                         $this->mIsLast = ( $numRows < $queryLimit );
1323                         $this->mLastShown = $lastIndex;
1324                         $this->mFirstShown = $firstIndex;
1325                 }
1326                 $this->mQueryDone = true;
1327         }
1328
1329         /**
1330          * @param $enable bool
1331          */
1332         protected function preventClickjacking( $enable = true ) {
1333                 $this->preventClickjacking = $enable;
1334         }
1335
1336         /**
1337          * @return bool
1338          */
1339         public function getPreventClickjacking() {
1340                 return $this->preventClickjacking;
1341         }
1342
1343 }