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()->getPageViewLanguage();
 157                         $out->addHTML( Xml::openElement( 'div', array( 'id' => 'mw-imagepage-content',
 158                                 'lang' => $pageLang->getHtmlCode(), 'dir' => $pageLang->getDir(),
 159                                 'class' => 'mw-content-'.$pageLang->getDir() ) ) );
 160
 161                         parent::view();
 162
 163                         $out->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                         wfMessage( 'imagelinks' )->text() ) . "\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(
 201                                 'h2',
 202                                 array( 'id' => 'metadata' ),
 203                                 wfMessage( 'metadata' )->text() ) . "\n" );
 204                         $out->addWikiText( $this->makeMetadataTable( $formattedMetadata ) );
 205                         $out->addModules( array( 'mediawiki.action.view.metadata' ) );
 206                 }
 207
 208                 // Add remote Filepage.css
 209                 if( !$this->repo->isLocal() ) {
 210                         $css = $this->repo->getDescriptionStylesheetUrl();
 211                         if ( $css ) {
 212                                 $out->addStyle( $css );
 213                         }
 214                 }
 215                 // always show the local local Filepage.css, bug 29277
 216                 $out->addModuleStyles( 'filepage' );
 217         }
 218
 219         /**
 220          * @return File
 221          */
 222         public function getDisplayedFile() {
 223                 $this->loadFile();
 224                 return $this->displayImg;
 225         }
 226
 227         /**
 228          * Create the TOC
 229          *
 230          * @param $metadata Boolean: whether or not to show the metadata link
 231          * @return String
 232          */
 233         protected function showTOC( $metadata ) {
 234                 $r = array(
 235                         '<li><a href="#file">' . wfMessage( 'file-anchor-link' )->escaped() . '</a></li>',
 236                         '<li><a href="#filehistory">' . wfMessage( 'filehist' )->escaped() . '</a></li>',
 237                         '<li><a href="#filelinks">' . wfMessage( 'imagelinks' )->escaped() . '</a></li>',
 238                 );
 239                 if ( $metadata ) {
 240                         $r[] = '<li><a href="#metadata">' . wfMessage( 'metadata' )->escaped() . '</a></li>';
 241                 }
 242
 243                 wfRunHooks( 'ImagePageShowTOC', array( $this, &$r ) );
 244
 245                 return '<ul id="filetoc">' . implode( "\n", $r ) . '</ul>';
 246         }
 247
 248         /**
 249          * Make a table with metadata to be shown in the output page.
 250          *
 251          * @todo FIXME: Bad interface, see note on MediaHandler::formatMetadata().
 252          *
 253          * @param $metadata Array: the array containing the EXIF data
 254          * @return String The metadata table. This is treated as Wikitext (!)
 255          */
 256         protected function makeMetadataTable( $metadata ) {
 257                 $r = "<div class=\"mw-imagepage-section-metadata\">";
 258                 $r .= wfMessage( 'metadata-help' )->plain();
 259                 $r .= "<table id=\"mw_metadata\" class=\"mw_metadata\">\n";
 260                 foreach ( $metadata as $type => $stuff ) {
 261                         foreach ( $stuff as $v ) {
 262                                 # @todo FIXME: Why is this using escapeId for a class?!
 263                                 $class = Sanitizer::escapeId( $v['id'] );
 264                                 if ( $type == 'collapsed' ) {
 265                                         $class .= ' collapsable';
 266                                 }
 267                                 $r .= "<tr class=\"$class\">\n";
 268                                 $r .= "<th>{$v['name']}</th>\n";
 269                                 $r .= "<td>{$v['value']}</td>\n</tr>";
 270                         }
 271                 }
 272                 $r .= "</table>\n</div>\n";
 273                 return $r;
 274         }
 275
 276         /**
 277          * Overloading Article's getContentObject method.
 278          *
 279          * Omit noarticletext if sharedupload; text will be fetched from the
 280          * shared upload server if possible.
 281          * @return string
 282          */
 283         public function getContentObject() {
 284                 $this->loadFile();
 285                 if ( $this->mPage->getFile() && !$this->mPage->getFile()->isLocal() && 0 == $this->getID() ) {
 286                         return null;
 287                 }
 288                 return parent::getContentObject();
 289         }
 290
 291         protected function openShowImage() {
 292                 global $wgImageLimits, $wgEnableUploads, $wgSend404Code;
 293
 294                 $this->loadFile();
 295                 $out = $this->getContext()->getOutput();
 296                 $user = $this->getContext()->getUser();
 297                 $lang = $this->getContext()->getLanguage();
 298                 $dirmark = $lang->getDirMarkEntity();
 299                 $request = $this->getContext()->getRequest();
 300
 301                 $sizeSel = intval( $user->getOption( 'imagesize' ) );
 302                 if ( !isset( $wgImageLimits[$sizeSel] ) ) {
 303                         $sizeSel = User::getDefaultOption( 'imagesize' );
 304
 305                         // The user offset might still be incorrect, specially if
 306                         // $wgImageLimits got changed (see bug #8858).
 307                         if ( !isset( $wgImageLimits[$sizeSel] ) ) {
 308                                 // Default to the first offset in $wgImageLimits
 309                                 $sizeSel = 0;
 310                         }
 311                 }
 312                 $max = $wgImageLimits[$sizeSel];
 313                 $maxWidth = $max[0];
 314                 $maxHeight = $max[1];
 315
 316                 if ( $this->displayImg->exists() ) {
 317                         # image
 318                         $page = $request->getIntOrNull( 'page' );
 319                         if ( is_null( $page ) ) {
 320                                 $params = array();
 321                                 $page = 1;
 322                         } else {
 323                                 $params = array( 'page' => $page );
 324                         }
 325                         $width_orig = $this->displayImg->getWidth( $page );
 326                         $width = $width_orig;
 327                         $height_orig = $this->displayImg->getHeight( $page );
 328                         $height = $height_orig;
 329
 330                         $longDesc = wfMessage( 'parentheses', $this->displayImg->getLongDesc() )->text();
 331
 332                         wfRunHooks( 'ImageOpenShowImageInlineBefore', array( &$this, &$out ) );
 333
 334                         if ( $this->displayImg->allowInlineDisplay() ) {
 335                                 # image
 336
 337                                 # "Download high res version" link below the image
 338                                 # $msgsize = wfMessage( 'file-info-size', $width_orig, $height_orig, Linker::formatSize( $this->displayImg->getSize() ), $mime )->escaped();
 339                                 # We'll show a thumbnail of this image
 340                                 if ( $width > $maxWidth || $height > $maxHeight ) {
 341                                         # Calculate the thumbnail size.
 342                                         # First case, the limiting factor is the width, not the height.
 343                                         if ( $width / $height >= $maxWidth / $maxHeight ) { // FIXME: Possible divison by 0. bug 36911
 344                                                 $height = round( $height * $maxWidth / $width ); // FIXME: Possible divison by 0. bug 36911
 345                                                 $width = $maxWidth;
 346                                                 # Note that $height <= $maxHeight now.
 347                                         } else {
 348                                                 $newwidth = floor( $width * $maxHeight / $height ); // FIXME: Possible divison by 0. bug 36911
 349                                                 $height = round( $height * $newwidth / $width ); // FIXME: Possible divison by 0. bug 36911
 350                                                 $width = $newwidth;
 351                                                 # Note that $height <= $maxHeight now, but might not be identical
 352                                                 # because of rounding.
 353                                         }
 354                                         $msgbig = wfMessage( 'show-big-image' )->escaped();
 355                                         if ( $this->displayImg->getRepo()->canTransformVia404() ) {
 356                                                 $thumbSizes = $wgImageLimits;
 357                                         } else {
 358                                                 # Creating thumb links triggers thumbnail generation.
 359                                                 # Just generate the thumb for the current users prefs.
 360                                                 $thumbOption = $user->getOption( 'thumbsize' );
 361                                                 $thumbSizes = array( isset( $wgImageLimits[$thumbOption] )
 362                                                         ? $wgImageLimits[$thumbOption]
 363                                                         : $wgImageLimits[User::getDefaultOption( 'thumbsize' )] );
 364                                         }
 365                                         # Generate thumbnails or thumbnail links as needed...
 366                                         $otherSizes = array();
 367                                         foreach ( $thumbSizes as $size ) {
 368                                                 if ( $size[0] < $width_orig && $size[1] < $height_orig
 369                                                         && $size[0] != $width && $size[1] != $height )
 370                                                 {
 371                                                         $otherSizes[] = $this->makeSizeLink( $params, $size[0], $size[1] );
 372                                                 }
 373                                         }
 374                                         $msgsmall = wfMessage( 'show-big-image-preview' )->
 375                                                 rawParams( $this->makeSizeLink( $params, $width, $height ) )->
 376                                                 parse();
 377                                         if ( count( $otherSizes ) ) {
 378                                                 $msgsmall .= ' ' .
 379                                                 Html::rawElement( 'span', array( 'class' => 'mw-filepage-other-resolutions' ),
 380                                                         wfMessage( 'show-big-image-other' )->rawParams( $lang->pipeList( $otherSizes ) )->
 381                                                         params( count( $otherSizes ) )->parse()
 382                                                 );
 383                                         }
 384                                 } elseif ( $width == 0 && $height == 0 ){
 385                                         # Some sort of audio file that doesn't have dimensions
 386                                         # Don't output a no hi res message for such a file
 387                                         $msgsmall = '';
 388                                 } elseif ( $this->displayImg->isVectorized() ) {
 389                                         # For vectorized images, full size is just the frame size
 390                                         $msgsmall = '';
 391                                 } else {
 392                                         # Image is small enough to show full size on image page
 393                                         $msgsmall = wfMessage( 'file-nohires' )->parse();
 394                                 }
 395
 396                                 $params['width'] = $width;
 397                                 $params['height'] = $height;
 398                                 $thumbnail = $this->displayImg->transform( $params );
 399
 400                                 $showLink = true;
 401                                 $anchorclose = Html::rawElement( 'div', array( 'class' => 'mw-filepage-resolutioninfo' ), $msgsmall );
 402
 403                                 $isMulti = $this->displayImg->isMultipage() && $this->displayImg->pageCount() > 1;
 404                                 if ( $isMulti ) {
 405                                         $out->addHTML( '<table class="multipageimage"><tr><td>' );
 406                                 }
 407
 408                                 if ( $thumbnail ) {
 409                                         $options = array(
 410                                                 'alt' => $this->displayImg->getTitle()->getPrefixedText(),
 411                                                 'file-link' => true,
 412                                         );
 413                                         $out->addHTML( '<div class="fullImageLink" id="file">' .
 414                                                 $thumbnail->toHtml( $options ) .
 415                                                 $anchorclose . "</div>\n" );
 416                                 }
 417
 418                                 if ( $isMulti ) {
 419                                         $count = $this->displayImg->pageCount();
 420
 421                                         if ( $page > 1 ) {
 422                                                 $label = $out->parse( wfMessage( 'imgmultipageprev' )->text(), false );
 423                                                 $link = Linker::linkKnown(
 424                                                         $this->getTitle(),
 425                                                         $label,
 426                                                         array(),
 427                                                         array( 'page' => $page - 1 )
 428                                                 );
 429                                                 $thumb1 = Linker::makeThumbLinkObj( $this->getTitle(), $this->displayImg, $link, $label, 'none',
 430                                                         array( 'page' => $page - 1 ) );
 431                                         } else {
 432                                                 $thumb1 = '';
 433                                         }
 434
 435                                         if ( $page < $count ) {
 436                                                 $label = wfMessage( 'imgmultipagenext' )->text();
 437                                                 $link = Linker::linkKnown(
 438                                                         $this->getTitle(),
 439                                                         $label,
 440                                                         array(),
 441                                                         array( 'page' => $page + 1 )
 442                                                 );
 443                                                 $thumb2 = Linker::makeThumbLinkObj( $this->getTitle(), $this->displayImg, $link, $label, 'none',
 444                                                         array( 'page' => $page + 1 ) );
 445                                         } else {
 446                                                 $thumb2 = '';
 447                                         }
 448
 449                                         global $wgScript;
 450
 451                                         $formParams = array(
 452                                                 'name' => 'pageselector',
 453                                                 'action' => $wgScript,
 454                                                 'onchange' => 'document.pageselector.submit();',
 455                                         );
 456                                         $options = array();
 457                                         for ( $i = 1; $i <= $count; $i++ ) {
 458                                                 $options[] = Xml::option( $lang->formatNum( $i ), $i, $i == $page );
 459                                         }
 460                                         $select = Xml::tags( 'select',
 461                                                 array( 'id' => 'pageselector', 'name' => 'page' ),
 462                                                 implode( "\n", $options ) );
 463
 464                                         $out->addHTML(
 465                                                 '</td><td><div class="multipageimagenavbox">' .
 466                                                 Xml::openElement( 'form', $formParams ) .
 467                                                 Html::hidden( 'title', $this->getTitle()->getPrefixedDBkey() ) .
 468                                                         wfMessage( 'imgmultigoto' )->rawParams( $select )->parse() .
 469                                                 Xml::submitButton( wfMessage( 'imgmultigo' )->text() ) .
 470                                                 Xml::closeElement( 'form' ) .
 471                                                 "<hr />$thumb1\n$thumb2<br style=\"clear: both\" /></div></td></tr></table>"
 472                                         );
 473                                 }
 474                         } else {
 475                                 # if direct link is allowed but it's not a renderable image, show an icon.
 476                                 if ( $this->displayImg->isSafeFile() ) {
 477                                         $icon = $this->displayImg->iconThumb();
 478
 479                                         $out->addHTML( '<div class="fullImageLink" id="file">' .
 480                                                 $icon->toHtml( array( 'file-link' => true ) ) .
 481                                                 "</div>\n" );
 482                                 }
 483
 484                                 $showLink = true;
 485                         }
 486
 487                         if ( $showLink ) {
 488                                 $filename = wfEscapeWikiText( $this->displayImg->getName() );
 489                                 $linktext = $filename;
 490                                 if ( isset( $msgbig ) ) {
 491                                         $linktext = wfEscapeWikiText( $msgbig );
 492                                 }
 493                                 $medialink = "[[Media:$filename|$linktext]]";
 494
 495                                 if ( !$this->displayImg->isSafeFile() ) {
 496                                         $warning = wfMessage( 'mediawarning' )->plain();
 497                                         // dirmark is needed here to separate the file name, which
 498                                         // most likely ends in Latin characters, from the description,
 499                                         // which may begin with the file type. In RTL environment
 500                                         // this will get messy.
 501                                         // The dirmark, however, must not be immediately adjacent
 502                                         // to the filename, because it can get copied with it.
 503                                         // See bug 25277.
 504                                         $out->addWikiText( <<<EOT
 505 <div class="fullMedia"><span class="dangerousLink">{$medialink}</span> $dirmark<span class="fileInfo">$longDesc</span></div>
 506 <div class="mediaWarning">$warning</div>
 507 EOT
 508                                                 );
 509                                 } else {
 510                                         $out->addWikiText( <<<EOT
 511 <div class="fullMedia">{$medialink} {$dirmark}<span class="fileInfo">$longDesc</span>
 512 </div>
 513 EOT
 514                                         );
 515                                 }
 516                         }
 517
 518                         // Add cannot animate thumbnail warning
 519                         if ( !$this->displayImg->canAnimateThumbIfAppropriate() ) {
 520                                 // Include the extension so wiki admins can
 521                                 // customize it on a per file-type basis
 522                                 // (aka say things like use format X instead).
 523                                 // additionally have a specific message for
 524                                 // file-no-thumb-animation-gif
 525                                 $ext = $this->displayImg->getExtension();
 526                                 $noAnimMesg = wfMessageFallback(
 527                                         'file-no-thumb-animation-' . $ext,
 528                                         'file-no-thumb-animation'
 529                                 )->plain();
 530
 531                                 $out->addWikiText( <<<EOT
 532 <div class="mw-noanimatethumb">{$noAnimMesg}</div>
 533 EOT
 534                                 );
 535                         }
 536
 537                         if ( !$this->displayImg->isLocal() ) {
 538                                 $this->printSharedImageText();
 539                         }
 540                 } else {
 541                         # Image does not exist
 542                         if ( !$this->getID() ) {
 543                                 # No article exists either
 544                                 # Show deletion log to be consistent with normal articles
 545                                 LogEventsList::showLogExtract(
 546                                         $out,
 547                                         array( 'delete', 'move' ),
 548                                         $this->getTitle()->getPrefixedText(),
 549                                         '',
 550                                         array(  'lim' => 10,
 551                                                 'conds' => array( "log_action != 'revision'" ),
 552                                                 'showIfEmpty' => false,
 553                                                 'msgKey' => array( 'moveddeleted-notice' )
 554                                         )
 555                                 );
 556                         }
 557
 558                         if ( $wgEnableUploads && $user->isAllowed( 'upload' ) ) {
 559                                 // Only show an upload link if the user can upload
 560                                 $uploadTitle = SpecialPage::getTitleFor( 'Upload' );
 561                                 $nofile = array(
 562                                         'filepage-nofile-link',
 563                                         $uploadTitle->getFullURL( array( 'wpDestFile' => $this->mPage->getFile()->getName() ) )
 564                                 );
 565                         } else {
 566                                 $nofile = 'filepage-nofile';
 567                         }
 568                         // Note, if there is an image description page, but
 569                         // no image, then this setRobotPolicy is overriden
 570                         // by Article::View().
 571                         $out->setRobotPolicy( 'noindex,nofollow' );
 572                         $out->wrapWikiMsg( "<div id='mw-imagepage-nofile' class='plainlinks'>\n$1\n</div>", $nofile );
 573                         if ( !$this->getID() && $wgSend404Code ) {
 574                                 // If there is no image, no shared image, and no description page,
 575                                 // output a 404, to be consistent with articles.
 576                                 $request->response()->header( 'HTTP/1.1 404 Not Found' );
 577                         }
 578                 }
 579                 $out->setFileVersion( $this->displayImg );
 580         }
 581
 582         /**
 583          * Creates an thumbnail of specified size and returns an HTML link to it
 584          * @param $params array Scaler parameters
 585          * @param $width int
 586          * @param $height int
 587          * @return string
 588          */
 589         private function makeSizeLink( $params, $width, $height ) {
 590                 $params['width'] = $width;
 591                 $params['height'] = $height;
 592                 $thumbnail = $this->displayImg->transform( $params );
 593                 if ( $thumbnail && !$thumbnail->isError() ) {
 594                         return Html::rawElement( 'a', array(
 595                                 'href' => $thumbnail->getUrl(),
 596                                 'class' => 'mw-thumbnail-link'
 597                                 ), wfMessage( 'show-big-image-size' )->numParams(
 598                                         $thumbnail->getWidth(), $thumbnail->getHeight()
 599                                 )->parse() );
 600                 } else {
 601                         return '';
 602                 }
 603         }
 604
 605         /**
 606          * Show a notice that the file is from a shared repository
 607          */
 608         protected function printSharedImageText() {
 609                 $out = $this->getContext()->getOutput();
 610                 $this->loadFile();
 611
 612                 $descUrl = $this->mPage->getFile()->getDescriptionUrl();
 613                 $descText = $this->mPage->getFile()->getDescriptionText();
 614
 615                 /* Add canonical to head if there is no local page for this shared file */
 616                 if( $descUrl && $this->mPage->getID() == 0 ) {
 617                         $out->addLink( array( 'rel' => 'canonical', 'href' => $descUrl ) );
 618                 }
 619
 620                 $wrap = "<div class=\"sharedUploadNotice\">\n$1\n</div>\n";
 621                 $repo = $this->mPage->getFile()->getRepo()->getDisplayName();
 622
 623                 if ( $descUrl && $descText && wfMessage( 'sharedupload-desc-here' )->plain() !== '-'  ) {
 624                         $out->wrapWikiMsg( $wrap, array( 'sharedupload-desc-here', $repo, $descUrl ) );
 625                 } elseif ( $descUrl && wfMessage( 'sharedupload-desc-there' )->plain() !== '-' ) {
 626                         $out->wrapWikiMsg( $wrap, array( 'sharedupload-desc-there', $repo, $descUrl ) );
 627                 } else {
 628                         $out->wrapWikiMsg( $wrap, array( 'sharedupload', $repo ), ''/*BACKCOMPAT*/ );
 629                 }
 630
 631                 if ( $descText ) {
 632                         $this->mExtraDescription = $descText;
 633                 }
 634         }
 635
 636         public function getUploadUrl() {
 637                 $this->loadFile();
 638                 $uploadTitle = SpecialPage::getTitleFor( 'Upload' );
 639                 return $uploadTitle->getFullURL( array(
 640                         'wpDestFile' => $this->mPage->getFile()->getName(),
 641                         'wpForReUpload' => 1
 642                  ) );
 643         }
 644
 645         /**
 646          * Print out the various links at the bottom of the image page, e.g. reupload,
 647          * external editing (and instructions link) etc.
 648          */
 649         protected function uploadLinksBox() {
 650                 global $wgEnableUploads, $wgUseExternalEditor;
 651
 652                 if ( !$wgEnableUploads ) {
 653                         return;
 654                 }
 655
 656                 $this->loadFile();
 657                 if ( !$this->mPage->getFile()->isLocal() ) {
 658                         return;
 659                 }
 660
 661                 $out = $this->getContext()->getOutput();
 662                 $out->addHTML( "<ul>\n" );
 663
 664                 # "Upload a new version of this file" link
 665                 $canUpload = $this->getTitle()->userCan( 'upload', $this->getContext()->getUser() );
 666                 if ( $canUpload && UploadBase::userCanReUpload( $this->getContext()->getUser(), $this->mPage->getFile()->name ) ) {
 667                         $ulink = Linker::makeExternalLink( $this->getUploadUrl(), wfMessage( 'uploadnewversion-linktext' )->text() );
 668                         $out->addHTML( "<li id=\"mw-imagepage-reupload-link\"><div class=\"plainlinks\">{$ulink}</div></li>\n" );
 669                 } else {
 670                         $out->addHTML( "<li id=\"mw-imagepage-upload-disallowed\">" . $this->getContext()->msg( 'upload-disallowed-here' )->escaped() . "</li>\n" );
 671                 }
 672
 673                 # External editing link
 674                 if ( $wgUseExternalEditor ) {
 675                         $elink = Linker::linkKnown(
 676                                 $this->getTitle(),
 677                                 wfMessage( 'edit-externally' )->escaped(),
 678                                 array(),
 679                                 array(
 680                                         'action' => 'edit',
 681                                         'externaledit' => 'true',
 682                                         'mode' => 'file'
 683                                 )
 684                         );
 685                         $out->addHTML(
 686                                 '<li id="mw-imagepage-edit-external">' . $elink . ' <small>' .
 687                                         wfMessage( 'edit-externally-help' )->parse() .
 688                                         "</small></li>\n"
 689                         );
 690                 }
 691
 692                 $out->addHTML( "</ul>\n" );
 693         }
 694
 695         protected function closeShowImage() { } # For overloading
 696
 697         /**
 698          * If the page we've just displayed is in the "Image" namespace,
 699          * we follow it with an upload history of the image and its usage.
 700          */
 701         protected function imageHistory() {
 702                 $this->loadFile();
 703                 $out = $this->getContext()->getOutput();
 704                 $pager = new ImageHistoryPseudoPager( $this );
 705                 $out->addHTML( $pager->getBody() );
 706                 $out->preventClickjacking( $pager->getPreventClickjacking() );
 707
 708                 $this->mPage->getFile()->resetHistory(); // free db resources
 709
 710                 # Exist check because we don't want to show this on pages where an image
 711                 # doesn't exist along with the noimage message, that would suck. -ævar
 712                 if ( $this->mPage->getFile()->exists() ) {
 713                         $this->uploadLinksBox();
 714                 }
 715         }
 716
 717         /**
 718          * @param $target
 719          * @param $limit
 720          * @return ResultWrapper
 721          */
 722         protected function queryImageLinks( $target, $limit ) {
 723                 $dbr = wfGetDB( DB_SLAVE );
 724
 725                 return $dbr->select(
 726                         array( 'imagelinks', 'page' ),
 727                         array( 'page_namespace', 'page_title', 'page_is_redirect', 'il_to' ),
 728                         array( 'il_to' => $target, 'il_from = page_id' ),
 729                         __METHOD__,
 730                         array( 'LIMIT' => $limit + 1, 'ORDER BY' => 'il_from', )
 731                 );
 732         }
 733
 734         protected function imageLinks() {
 735                 $limit = 100;
 736
 737                 $out = $this->getContext()->getOutput();
 738                 $res = $this->queryImageLinks( $this->getTitle()->getDbKey(), $limit + 1);
 739                 $rows = array();
 740                 $redirects = array();
 741                 foreach ( $res as $row ) {
 742                         if ( $row->page_is_redirect ) {
 743                                 $redirects[$row->page_title] = array();
 744                         }
 745                         $rows[] = $row;
 746                 }
 747                 $count = count( $rows );
 748
 749                 $hasMore = $count > $limit;
 750                 if ( !$hasMore && count( $redirects ) ) {
 751                         $res = $this->queryImageLinks( array_keys( $redirects ),
 752                                 $limit - count( $rows ) + 1 );
 753                         foreach ( $res as $row ) {
 754                                 $redirects[$row->il_to][] = $row;
 755                                 $count++;
 756                         }
 757                         $hasMore = ( $res->numRows() + count( $rows ) ) > $limit;
 758                 }
 759
 760                 if ( $count == 0 ) {
 761                         $out->wrapWikiMsg(
 762                                 Html::rawElement( 'div',
 763                                         array( 'id' => 'mw-imagepage-nolinkstoimage' ), "\n$1\n" ),
 764                                 'nolinkstoimage'
 765                         );
 766                         return;
 767                 }
 768
 769                 $out->addHTML( "<div id='mw-imagepage-section-linkstoimage'>\n" );
 770                 if ( !$hasMore ) {
 771                         $out->addWikiMsg( 'linkstoimage', $count );
 772                 } else {
 773                         // More links than the limit. Add a link to [[Special:Whatlinkshere]]
 774                         $out->addWikiMsg( 'linkstoimage-more',
 775                                 $this->getContext()->getLanguage()->formatNum( $limit ),
 776                                 $this->getTitle()->getPrefixedDBkey()
 777                         );
 778                 }
 779
 780                 $out->addHTML(
 781                         Html::openElement( 'ul',
 782                                 array( 'class' => 'mw-imagepage-linkstoimage' ) ) . "\n"
 783                 );
 784                 $count = 0;
 785
 786                 // Sort the list by namespace:title
 787                 usort( $rows, array( $this, 'compare' ) );
 788
 789                 // Create links for every element
 790                 $currentCount = 0;
 791                 foreach( $rows as $element ) {
 792                         $currentCount++;
 793                         if ( $currentCount > $limit ) {
 794                                 break;
 795                         }
 796
 797                         $link = Linker::linkKnown( Title::makeTitle( $element->page_namespace, $element->page_title ) );
 798                         if ( !isset( $redirects[$element->page_title] ) ) {
 799                                 $liContents = $link;
 800                         } else {
 801                                 $ul = "<ul class='mw-imagepage-redirectstofile'>\n";
 802                                 foreach ( $redirects[$element->page_title] as $row ) {
 803                                         $currentCount++;
 804                                         if ( $currentCount > $limit ) {
 805                                                 break;
 806                                         }
 807
 808                                         $link2 = Linker::linkKnown( Title::makeTitle( $row->page_namespace, $row->page_title ) );
 809                                         $ul .= Html::rawElement(
 810                                                 'li',
 811                                                 array( 'class' => 'mw-imagepage-linkstoimage-ns' . $element->page_namespace ),
 812                                                 $link2
 813                                                 ) . "\n";
 814                                 }
 815                                 $ul .= '</ul>';
 816                                 $liContents = wfMessage( 'linkstoimage-redirect' )->rawParams(
 817                                         $link, $ul )->parse();
 818                         }
 819                         $out->addHTML( Html::rawElement(
 820                                         'li',
 821                                         array( 'class' => 'mw-imagepage-linkstoimage-ns' . $element->page_namespace ),
 822                                         $liContents
 823                                 ) . "\n"
 824                         );
 825
 826                 };
 827                 $out->addHTML( Html::closeElement( 'ul' ) . "\n" );
 828                 $res->free();
 829
 830                 // Add a links to [[Special:Whatlinkshere]]
 831                 if ( $count > $limit ) {
 832                         $out->addWikiMsg( 'morelinkstoimage', $this->getTitle()->getPrefixedDBkey() );
 833                 }
 834                 $out->addHTML( Html::closeElement( 'div' ) . "\n" );
 835         }
 836
 837         protected function imageDupes() {
 838                 $this->loadFile();
 839                 $out = $this->getContext()->getOutput();
 840
 841                 $dupes = $this->mPage->getDuplicates();
 842                 if ( count( $dupes ) == 0 ) {
 843                         return;
 844                 }
 845
 846                 $out->addHTML( "<div id='mw-imagepage-section-duplicates'>\n" );
 847                 $out->addWikiMsg( 'duplicatesoffile',
 848                         $this->getContext()->getLanguage()->formatNum( count( $dupes ) ), $this->getTitle()->getDBkey()
 849                 );
 850                 $out->addHTML( "<ul class='mw-imagepage-duplicates'>\n" );
 851
 852                 /**
 853                  * @var $file File
 854                  */
 855                 foreach ( $dupes as $file ) {
 856                         $fromSrc = '';
 857                         if ( $file->isLocal() ) {
 858                                 $link = Linker::linkKnown( $file->getTitle() );
 859                         } else {
 860                                 $link = Linker::makeExternalLink( $file->getDescriptionUrl(),
 861                                         $file->getTitle()->getPrefixedText() );
 862                                 $fromSrc = wfMessage( 'shared-repo-from', $file->getRepo()->getDisplayName() )->text();
 863                         }
 864                         $out->addHTML( "<li>{$link} {$fromSrc}</li>\n" );
 865                 }
 866                 $out->addHTML( "</ul></div>\n" );
 867         }
 868
 869         /**
 870          * Delete the file, or an earlier version of it
 871          */
 872         public function delete() {
 873                 $file = $this->mPage->getFile();
 874                 if ( !$file->exists() || !$file->isLocal() || $file->getRedirected() ) {
 875                         // Standard article deletion
 876                         parent::delete();
 877                         return;
 878                 }
 879
 880                 $deleter = new FileDeleteForm( $file );
 881                 $deleter->execute();
 882         }
 883
 884         /**
 885          * Display an error with a wikitext description
 886          *
 887          * @param $description String
 888          */
 889         function showError( $description ) {
 890                 $out = $this->getContext()->getOutput();
 891                 $out->setPageTitle( wfMessage( 'internalerror' ) );
 892                 $out->setRobotPolicy( 'noindex,nofollow' );
 893                 $out->setArticleRelated( false );
 894                 $out->enableClientCache( false );
 895                 $out->addWikiText( $description );
 896         }
 897
 898         /**
 899          * Callback for usort() to do link sorts by (namespace, title)
 900          * Function copied from Title::compare()
 901          *
 902          * @param $a object page to compare with
 903          * @param $b object page to compare with
 904          * @return Integer: result of string comparison, or namespace comparison
 905          */
 906         protected function compare( $a, $b ) {
 907                 if ( $a->page_namespace == $b->page_namespace ) {
 908                         return strcmp( $a->page_title, $b->page_title );
 909                 } else {
 910                         return $a->page_namespace - $b->page_namespace;
 911                 }
 912         }
 913 }
 914
 915 /**
 916  * Builds the image revision log shown on image pages
 917  *
 918  * @ingroup Media
 919  */
 920 class ImageHistoryList extends ContextSource {
 921
 922         /**
 923          * @var Title
 924          */
 925         protected $title;
 926
 927         /**
 928          * @var File
 929          */
 930         protected $img;
 931
 932         /**
 933          * @var ImagePage
 934          */
 935         protected $imagePage;
 936
 937         /**
 938          * @var File
 939          */
 940         protected $current;
 941
 942         protected $repo, $showThumb;
 943         protected $preventClickjacking = false;
 944
 945         /**
 946          * @param ImagePage $imagePage
 947          */
 948         public function __construct( $imagePage ) {
 949                 global $wgShowArchiveThumbnails;
 950                 $this->current = $imagePage->getFile();
 951                 $this->img = $imagePage->getDisplayedFile();
 952                 $this->title = $imagePage->getTitle();
 953                 $this->imagePage = $imagePage;
 954                 $this->showThumb = $wgShowArchiveThumbnails && $this->img->canRender();
 955                 $this->setContext( $imagePage->getContext() );
 956         }
 957
 958         /**
 959          * @return ImagePage
 960          */
 961         public function getImagePage() {
 962                 return $this->imagePage;
 963         }
 964
 965         /**
 966          * @return File
 967          */
 968         public function getFile() {
 969                 return $this->img;
 970         }
 971
 972         /**
 973          * @param $navLinks string
 974          * @return string
 975          */
 976         public function beginImageHistoryList( $navLinks = '' ) {
 977                 return Xml::element( 'h2', array( 'id' => 'filehistory' ), $this->msg( 'filehist' )->text() ) . "\n"
 978                         . "<div id=\"mw-imagepage-section-filehistory\">\n"
 979                         . $this->msg( 'filehist-help' )->parseAsBlock()
 980                         . $navLinks . "\n"
 981                         . Xml::openElement( 'table', array( 'class' => 'wikitable filehistory' ) ) . "\n"
 982                         . '<tr><td></td>'
 983                         . ( $this->current->isLocal() && ( $this->getUser()->isAllowedAny( 'delete', 'deletedhistory' ) ) ? '<td></td>' : '' )
 984                         . '<th>' . $this->msg( 'filehist-datetime' )->escaped() . '</th>'
 985                         . ( $this->showThumb ? '<th>' . $this->msg( 'filehist-thumb' )->escaped() . '</th>' : '' )
 986                         . '<th>' . $this->msg( 'filehist-dimensions' )->escaped() . '</th>'
 987                         . '<th>' . $this->msg( 'filehist-user' )->escaped() . '</th>'
 988                         . '<th>' . $this->msg( 'filehist-comment' )->escaped() . '</th>'
 989                         . "</tr>\n";
 990         }
 991
 992         /**
 993          * @param $navLinks string
 994          * @return string
 995          */
 996         public function endImageHistoryList( $navLinks = '' ) {
 997                 return "</table>\n$navLinks\n</div>\n";
 998         }
 999
1000         /**
1001          * @param $iscur
1002          * @param $file File
1003          * @return string
1004          */
1005         public function imageHistoryLine( $iscur, $file ) {
1006                 global $wgContLang;
1007
1008                 $user = $this->getUser();
1009                 $lang = $this->getLanguage();
1010                 $timestamp = wfTimestamp( TS_MW, $file->getTimestamp() );
1011                 $img = $iscur ? $file->getName() : $file->getArchiveName();
1012                 $userId = $file->getUser( 'id' );
1013                 $userText = $file->getUser( 'text' );
1014                 $description = $file->getDescription( File::FOR_THIS_USER, $user );
1015
1016                 $local = $this->current->isLocal();
1017                 $row = $selected = '';
1018
1019                 // Deletion link
1020                 if ( $local && ( $user->isAllowedAny( 'delete', 'deletedhistory' ) ) ) {
1021                         $row .= '<td>';
1022                         # Link to remove from history
1023                         if ( $user->isAllowed( 'delete' ) ) {
1024                                 $q = array( 'action' => 'delete' );
1025                                 if ( !$iscur ) {
1026                                         $q['oldimage'] = $img;
1027                                 }
1028                                 $row .= Linker::linkKnown(
1029                                         $this->title,
1030                                         $this->msg( $iscur ? 'filehist-deleteall' : 'filehist-deleteone' )->escaped(),
1031                                         array(), $q
1032                                 );
1033                         }
1034                         # Link to hide content. Don't show useless link to people who cannot hide revisions.
1035                         $canHide = $user->isAllowed( 'deleterevision' );
1036                         if ( $canHide || ( $user->isAllowed( 'deletedhistory' ) && $file->getVisibility() ) ) {
1037                                 if ( $user->isAllowed( 'delete' ) ) {
1038                                         $row .= '<br />';
1039                                 }
1040                                 // If file is top revision or locked from this user, don't link
1041                                 if ( $iscur || !$file->userCan( File::DELETED_RESTRICTED, $user ) ) {
1042                                         $del = Linker::revDeleteLinkDisabled( $canHide );
1043                                 } else {
1044                                         list( $ts, ) = explode( '!', $img, 2 );
1045                                         $query = array(
1046                                                 'type'   => 'oldimage',
1047                                                 'target' => $this->title->getPrefixedText(),
1048                                                 'ids'    => $ts,
1049                                         );
1050                                         $del = Linker::revDeleteLink( $query,
1051                                                 $file->isDeleted( File::DELETED_RESTRICTED ), $canHide );
1052                                 }
1053                                 $row .= $del;
1054                         }
1055                         $row .= '</td>';
1056                 }
1057
1058                 // Reversion link/current indicator
1059                 $row .= '<td>';
1060                 if ( $iscur ) {
1061                         $row .= $this->msg( 'filehist-current' )->escaped();
1062                 } elseif ( $local && $this->title->quickUserCan( 'edit', $user )
1063                         && $this->title->quickUserCan( 'upload', $user )
1064                 ) {
1065                         if ( $file->isDeleted( File::DELETED_FILE ) ) {
1066                                 $row .= $this->msg( 'filehist-revert' )->escaped();
1067                         } else {
1068                                 $row .= Linker::linkKnown(
1069                                         $this->title,
1070                                         $this->msg( 'filehist-revert' )->escaped(),
1071                                         array(),
1072                                         array(
1073                                                 'action' => 'revert',
1074                                                 'oldimage' => $img,
1075                                                 'wpEditToken' => $user->getEditToken( $img )
1076                                         )
1077                                 );
1078                         }
1079                 }
1080                 $row .= '</td>';
1081
1082                 // Date/time and image link
1083                 if ( $file->getTimestamp() === $this->img->getTimestamp() ) {
1084                         $selected = "class='filehistory-selected'";
1085                 }
1086                 $row .= "<td $selected style='white-space: nowrap;'>";
1087                 if ( !$file->userCan( File::DELETED_FILE, $user ) ) {
1088                         # Don't link to unviewable files
1089                         $row .= '<span class="history-deleted">' . $lang->userTimeAndDate( $timestamp, $user ) . '</span>';
1090                 } elseif ( $file->isDeleted( File::DELETED_FILE ) ) {
1091                         if ( $local ) {
1092                                 $this->preventClickjacking();
1093                                 $revdel = SpecialPage::getTitleFor( 'Revisiondelete' );
1094                                 # Make a link to review the image
1095                                 $url = Linker::linkKnown(
1096                                         $revdel,
1097                                         $lang->userTimeAndDate( $timestamp, $user ),
1098                                         array(),
1099                                         array(
1100                                                 'target' => $this->title->getPrefixedText(),
1101                                                 'file' => $img,
1102                                                 'token' => $user->getEditToken( $img )
1103                                         )
1104                                 );
1105                         } else {
1106                                 $url = $lang->userTimeAndDate( $timestamp, $user );
1107                         }
1108                         $row .= '<span class="history-deleted">' . $url . '</span>';
1109                 } else {
1110                         $url = $iscur ? $this->current->getUrl() : $this->current->getArchiveUrl( $img );
1111                         $row .= Xml::element( 'a', array( 'href' => $url ), $lang->userTimeAndDate( $timestamp, $user ) );
1112                 }
1113                 $row .= "</td>";
1114
1115                 // Thumbnail
1116                 if ( $this->showThumb ) {
1117                         $row .= '<td>' . $this->getThumbForLine( $file ) . '</td>';
1118                 }
1119
1120                 // Image dimensions + size
1121                 $row .= '<td>';
1122                 $row .= htmlspecialchars( $file->getDimensionsString() );
1123                 $row .= $this->msg( 'word-separator' )->plain();
1124                 $row .= '<span style="white-space: nowrap;">';
1125                 $row .= $this->msg( 'parentheses' )->rawParams( Linker::formatSize( $file->getSize() ) )->plain();
1126                 $row .= '</span>';
1127                 $row .= '</td>';
1128
1129                 // Uploading user
1130                 $row .= '<td>';
1131                 // Hide deleted usernames
1132                 if ( $file->isDeleted( File::DELETED_USER ) ) {
1133                         $row .= '<span class="history-deleted">' . $this->msg( 'rev-deleted-user' )->escaped() . '</span>';
1134                 } else {
1135                         if ( $local ) {
1136                                 $row .= Linker::userLink( $userId, $userText );
1137                                 $row .= $this->msg( 'word-separator' )->plain();
1138                                 $row .= '<span style="white-space: nowrap;">';
1139                                 $row .= Linker::userToolLinks( $userId, $userText );
1140                                 $row .= '</span>';
1141                         } else {
1142                                 $row .= htmlspecialchars( $userText );
1143                         }
1144                 }
1145                 $row .= '</td>';
1146
1147                 // Don't show deleted descriptions
1148                 if ( $file->isDeleted( File::DELETED_COMMENT ) ) {
1149                         $row .= '<td><span class="history-deleted">' . $this->msg( 'rev-deleted-comment' )->escaped() . '</span></td>';
1150                 } else {
1151                         $row .= '<td dir="' . $wgContLang->getDir() . '">' . Linker::formatComment( $description, $this->title ) . '</td>';
1152                 }
1153
1154                 $rowClass = null;
1155                 wfRunHooks( 'ImagePageFileHistoryLine', array( $this, $file, &$row, &$rowClass ) );
1156                 $classAttr = $rowClass ? " class='$rowClass'" : '';
1157
1158                 return "<tr{$classAttr}>{$row}</tr>\n";
1159         }
1160
1161         /**
1162          * @param $file File
1163          * @return string
1164          */
1165         protected function getThumbForLine( $file ) {
1166                 $lang = $this->getLanguage();
1167                 $user = $this->getUser();
1168                 if ( $file->allowInlineDisplay() && $file->userCan( File::DELETED_FILE,$user )
1169                         && !$file->isDeleted( File::DELETED_FILE ) )
1170                 {
1171                         $params = array(
1172                                 'width' => '120',
1173                                 'height' => '120',
1174                         );
1175                         $timestamp = wfTimestamp( TS_MW, $file->getTimestamp() );
1176
1177                         $thumbnail = $file->transform( $params );
1178                         $options = array(
1179                                 'alt' => $this->msg( 'filehist-thumbtext',
1180                                         $lang->userTimeAndDate( $timestamp, $user ),
1181                                         $lang->userDate( $timestamp, $user ),
1182                                         $lang->userTime( $timestamp, $user ) )->text(),
1183                                 'file-link' => true,
1184                         );
1185
1186                         if ( !$thumbnail ) {
1187                                 return $this->msg( 'filehist-nothumb' )->escaped();
1188                         }
1189
1190                         return $thumbnail->toHtml( $options );
1191                 } else {
1192                         return $this->msg( 'filehist-nothumb' )->escaped();
1193                 }
1194         }
1195
1196         /**
1197          * @param $enable bool
1198          */
1199         protected function preventClickjacking( $enable = true ) {
1200                 $this->preventClickjacking = $enable;
1201         }
1202
1203         /**
1204          * @return bool
1205          */
1206         public function getPreventClickjacking() {
1207                 return $this->preventClickjacking;
1208         }
1209 }
1210
1211 class ImageHistoryPseudoPager extends ReverseChronologicalPager {
1212         protected $preventClickjacking = false;
1213
1214         /**
1215          * @var File
1216          */
1217         protected $mImg;
1218
1219         /**
1220          * @var Title
1221          */
1222         protected $mTitle;
1223
1224         /**
1225          * @param ImagePage $imagePage
1226          */
1227         function __construct( $imagePage ) {
1228                 parent::__construct();
1229                 $this->mImagePage = $imagePage;
1230                 $this->mTitle = clone ( $imagePage->getTitle() );
1231                 $this->mTitle->setFragment( '#filehistory' );
1232                 $this->mImg = null;
1233                 $this->mHist = array();
1234                 $this->mRange = array( 0, 0 ); // display range
1235         }
1236
1237         /**
1238          * @return Title
1239          */
1240         function getTitle() {
1241                 return $this->mTitle;
1242         }
1243
1244         function getQueryInfo() {
1245                 return false;
1246         }
1247
1248         /**
1249          * @return string
1250          */
1251         function getIndexField() {
1252                 return '';
1253         }
1254
1255         /**
1256          * @param $row object
1257          * @return string
1258          */
1259         function formatRow( $row ) {
1260                 return '';
1261         }
1262
1263         /**
1264          * @return string
1265          */
1266         function getBody() {
1267                 $s = '';
1268                 $this->doQuery();
1269                 if ( count( $this->mHist ) ) {
1270                         $list = new ImageHistoryList( $this->mImagePage );
1271                         # Generate prev/next links
1272                         $navLink = $this->getNavigationBar();
1273                         $s = $list->beginImageHistoryList( $navLink );
1274                         // Skip rows there just for paging links
1275                         for ( $i = $this->mRange[0]; $i <= $this->mRange[1]; $i++ ) {
1276                                 $file = $this->mHist[$i];
1277                                 $s .= $list->imageHistoryLine( !$file->isOld(), $file );
1278                         }
1279                         $s .= $list->endImageHistoryList( $navLink );
1280
1281                         if ( $list->getPreventClickjacking() ) {
1282                                 $this->preventClickjacking();
1283                         }
1284                 }
1285                 return $s;
1286         }
1287
1288         function doQuery() {
1289                 if ( $this->mQueryDone ) {
1290                         return;
1291                 }
1292                 $this->mImg = $this->mImagePage->getFile(); // ensure loading
1293                 if ( !$this->mImg->exists() ) {
1294                         return;
1295                 }
1296                 $queryLimit = $this->mLimit + 1; // limit plus extra row
1297                 if ( $this->mIsBackwards ) {
1298                         // Fetch the file history
1299                         $this->mHist = $this->mImg->getHistory( $queryLimit, null, $this->mOffset, false );
1300                         // The current rev may not meet the offset/limit
1301                         $numRows = count( $this->mHist );
1302                         if ( $numRows <= $this->mLimit && $this->mImg->getTimestamp() > $this->mOffset ) {
1303                                 $this->mHist = array_merge( array( $this->mImg ), $this->mHist );
1304                         }
1305                 } else {
1306                         // The current rev may not meet the offset
1307                         if ( !$this->mOffset || $this->mImg->getTimestamp() < $this->mOffset ) {
1308                                 $this->mHist[] = $this->mImg;
1309                         }
1310                         // Old image versions (fetch extra row for nav links)
1311                         $oiLimit = count( $this->mHist ) ? $this->mLimit : $this->mLimit + 1;
1312                         // Fetch the file history
1313                         $this->mHist = array_merge( $this->mHist,
1314                                 $this->mImg->getHistory( $oiLimit, $this->mOffset, null, false ) );
1315                 }
1316                 $numRows = count( $this->mHist ); // Total number of query results
1317                 if ( $numRows ) {
1318                         # Index value of top item in the list
1319                         $firstIndex = $this->mIsBackwards ?
1320                                 $this->mHist[$numRows - 1]->getTimestamp() : $this->mHist[0]->getTimestamp();
1321                         # Discard the extra result row if there is one
1322                         if ( $numRows > $this->mLimit && $numRows > 1 ) {
1323                                 if ( $this->mIsBackwards ) {
1324                                         # Index value of item past the index
1325                                         $this->mPastTheEndIndex = $this->mHist[0]->getTimestamp();
1326                                         # Index value of bottom item in the list
1327                                         $lastIndex = $this->mHist[1]->getTimestamp();
1328                                         # Display range
1329                                         $this->mRange = array( 1, $numRows - 1 );
1330                                 } else {
1331                                         # Index value of item past the index
1332                                         $this->mPastTheEndIndex = $this->mHist[$numRows - 1]->getTimestamp();
1333                                         # Index value of bottom item in the list
1334                                         $lastIndex = $this->mHist[$numRows - 2]->getTimestamp();
1335                                         # Display range
1336                                         $this->mRange = array( 0, $numRows - 2 );
1337                                 }
1338                         } else {
1339                                 # Setting indexes to an empty string means that they will be
1340                                 # omitted if they would otherwise appear in URLs. It just so
1341                                 # happens that this  is the right thing to do in the standard
1342                                 # UI, in all the relevant cases.
1343                                 $this->mPastTheEndIndex = '';
1344                                 # Index value of bottom item in the list
1345                                 $lastIndex = $this->mIsBackwards ?
1346                                         $this->mHist[0]->getTimestamp() : $this->mHist[$numRows - 1]->getTimestamp();
1347                                 # Display range
1348                                 $this->mRange = array( 0, $numRows - 1 );
1349                         }
1350                 } else {
1351                         $firstIndex = '';
1352                         $lastIndex = '';
1353                         $this->mPastTheEndIndex = '';
1354                 }
1355                 if ( $this->mIsBackwards ) {
1356                         $this->mIsFirst = ( $numRows < $queryLimit );
1357                         $this->mIsLast = ( $this->mOffset == '' );
1358                         $this->mLastShown = $firstIndex;
1359                         $this->mFirstShown = $lastIndex;
1360                 } else {
1361                         $this->mIsFirst = ( $this->mOffset == '' );
1362                         $this->mIsLast = ( $numRows < $queryLimit );
1363                         $this->mLastShown = $lastIndex;
1364                         $this->mFirstShown = $firstIndex;
1365                 }
1366                 $this->mQueryDone = true;
1367         }
1368
1369         /**
1370          * @param $enable bool
1371          */
1372         protected function preventClickjacking( $enable = true ) {
1373                 $this->preventClickjacking = $enable;
1374         }
1375
1376         /**
1377          * @return bool
1378          */
1379         public function getPreventClickjacking() {
1380                 return $this->preventClickjacking;
1381         }
1382
1383 }