includes/ImagePage.php

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