includes/ImagePage.php

   1 <?php
   2
   3 /**
   4  * Special handling for image description pages
   5  *
   6  * @ingroup Media
   7  */
   8 class ImagePage extends Article {
   9
  10         /**
  11          * @var File
  12          */
  13         private $img;
  14         private $displayImg;
  15         private $repo;
  16         private $fileLoaded;
  17
  18         var $mExtraDescription = false;
  19         var $dupes;
  20
  21         function __construct( $title ) {
  22                 parent::__construct( $title );
  23                 $this->dupes = null;
  24                 $this->repo = null;
  25         }
  26
  27         /**
  28          * @param $file File:
  29          * @return void
  30          */
  31         public function setFile( $file ) {
  32                 $this->displayImg = $file;
  33                 $this->img = $file;
  34                 $this->fileLoaded = true;
  35         }
  36
  37         protected function loadFile() {
  38                 if ( $this->fileLoaded ) {
  39                         return true;
  40                 }
  41                 $this->fileLoaded = true;
  42
  43                 $this->displayImg = $this->img = false;
  44                 wfRunHooks( 'ImagePageFindFile', array( $this, &$this->img, &$this->displayImg ) );
  45                 if ( !$this->img ) {
  46                         $this->img = wfFindFile( $this->mTitle );
  47                         if ( !$this->img ) {
  48                                 $this->img = wfLocalFile( $this->mTitle );
  49                         }
  50                 }
  51                 if ( !$this->displayImg ) {
  52                         $this->displayImg = $this->img;
  53                 }
  54                 $this->repo = $this->img->getRepo();
  55         }
  56
  57         /**
  58          * Handler for action=render
  59          * Include body text only; none of the image extras
  60          */
  61         public function render() {
  62                 global $wgOut;
  63                 $wgOut->setArticleBodyOnly( true );
  64                 parent::view();
  65         }
  66
  67         public function view() {
  68                 global $wgOut, $wgShowEXIF, $wgRequest, $wgUser;
  69
  70                 $diff = $wgRequest->getVal( 'diff' );
  71                 $diffOnly = $wgRequest->getBool( 'diffonly', $wgUser->getOption( 'diffonly' ) );
  72
  73                 if ( $this->mTitle->getNamespace() != NS_FILE || ( isset( $diff ) && $diffOnly ) ) {
  74                         return parent::view();
  75                 }
  76
  77                 $this->loadFile();
  78
  79                 if ( $this->mTitle->getNamespace() == NS_FILE && $this->img->getRedirected() ) {
  80                         if ( $this->mTitle->getDBkey() == $this->img->getName() || isset( $diff ) ) {
  81                                 // mTitle is the same as the redirect target so ask Article
  82                                 // to perform the redirect for us.
  83                                 $wgRequest->setVal( 'diffonly', 'true' );
  84                                 return parent::view();
  85                         } else {
  86                                 // mTitle is not the same as the redirect target so it is
  87                                 // probably the redirect page itself. Fake the redirect symbol
  88                                 $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
  89                                 $wgOut->addHTML( $this->viewRedirect( Title::makeTitle( NS_FILE, $this->img->getName() ),
  90                                         /* $appendSubtitle */ true, /* $forceKnown */ true ) );
  91                                 $this->viewUpdates();
  92                                 return;
  93                         }
  94                 }
  95
  96                 $this->showRedirectedFromHeader();
  97
  98                 if ( $wgShowEXIF && $this->displayImg->exists() ) {
  99                         // @todo FIXME: Bad interface, see note on MediaHandler::formatMetadata().
 100                         $formattedMetadata = $this->displayImg->formatMetadata();
 101                         $showmeta = $formattedMetadata !== false;
 102                 } else {
 103                         $showmeta = false;
 104                 }
 105
 106                 if ( !$diff && $this->displayImg->exists() ) {
 107                         $wgOut->addHTML( $this->showTOC( $showmeta ) );
 108                 }
 109
 110                 if ( !$diff ) {
 111                         $this->openShowImage();
 112                 }
 113
 114                 # No need to display noarticletext, we use our own message, output in openShowImage()
 115                 if ( $this->getID() ) {
 116                         parent::view();
 117                 } else {
 118                         # Just need to set the right headers
 119                         $wgOut->setArticleFlag( true );
 120                         $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
 121                         $this->viewUpdates();
 122                 }
 123
 124                 # Show shared description, if needed
 125                 if ( $this->mExtraDescription ) {
 126                         $fol = wfMessage( 'shareddescriptionfollows' );
 127                         if ( !$fol->isDisabled() ) {
 128                                 $wgOut->addWikiText( $fol->plain() );
 129                         }
 130                         $wgOut->addHTML( '<div id="shared-image-desc">' . $this->mExtraDescription . "</div>\n" );
 131                 }
 132
 133                 $this->closeShowImage();
 134                 $this->imageHistory();
 135                 // TODO: Cleanup the following
 136
 137                 $wgOut->addHTML( Xml::element( 'h2',
 138                         array( 'id' => 'filelinks' ),
 139                         wfMsg( 'imagelinks' ) ) . "\n" );
 140                 $this->imageDupes();
 141                 # @todo FIXME: For some freaky reason, we can't redirect to foreign images.
 142                 # Yet we return metadata about the target. Definitely an issue in the FileRepo
 143                 $this->imageLinks();
 144
 145                 # Allow extensions to add something after the image links
 146                 $html = '';
 147                 wfRunHooks( 'ImagePageAfterImageLinks', array( $this, &$html ) );
 148                 if ( $html ) {
 149                         $wgOut->addHTML( $html );
 150                 }
 151
 152                 if ( $showmeta ) {
 153                         $wgOut->addHTML( Xml::element( 'h2', array( 'id' => 'metadata' ), wfMsg( 'metadata' ) ) . "\n" );
 154                         $wgOut->addWikiText( $this->makeMetadataTable( $formattedMetadata ) );
 155                         $wgOut->addModules( array( 'mediawiki.action.view.metadata' ) );
 156                 }
 157
 158                 $css = $this->repo->getDescriptionStylesheetUrl();
 159                 if ( $css ) {
 160                         $wgOut->addStyle( $css );
 161                 }
 162         }
 163
 164         public function getRedirectTarget() {
 165                 $this->loadFile();
 166                 if ( $this->img->isLocal() ) {
 167                         return parent::getRedirectTarget();
 168                 }
 169                 // Foreign image page
 170                 $from = $this->img->getRedirected();
 171                 $to = $this->img->getName();
 172                 if ( $from == $to ) {
 173                         return null;
 174                 }
 175                 return $this->mRedirectTarget = Title::makeTitle( NS_FILE, $to );
 176         }
 177
 178         public function followRedirect() {
 179                 $this->loadFile();
 180                 if ( $this->img->isLocal() ) {
 181                         return parent::followRedirect();
 182                 }
 183                 $from = $this->img->getRedirected();
 184                 $to = $this->img->getName();
 185                 if ( $from == $to ) {
 186                         return false;
 187                 }
 188                 return Title::makeTitle( NS_FILE, $to );
 189         }
 190
 191         public function isRedirect( $text = false ) {
 192                 $this->loadFile();
 193                 if ( $this->img->isLocal() ) {
 194                         return parent::isRedirect( $text );
 195                 }
 196
 197                 return (bool)$this->img->getRedirected();
 198         }
 199
 200         public function isLocal() {
 201                 $this->loadFile();
 202                 return $this->img->isLocal();
 203         }
 204
 205         public function getFile() {
 206                 $this->loadFile();
 207                 return $this->img;
 208         }
 209
 210         public function getDisplayedFile() {
 211                 $this->loadFile();
 212                 return $this->displayImg;
 213         }
 214
 215         public function getDuplicates() {
 216                 $this->loadFile();
 217                 if ( !is_null( $this->dupes ) ) {
 218                         return $this->dupes;
 219                 }
 220                 $hash = $this->img->getSha1();
 221                 if ( !( $hash ) ) {
 222                         return $this->dupes = array();
 223                 }
 224                 $dupes = RepoGroup::singleton()->findBySha1( $hash );
 225                 // Remove duplicates with self and non matching file sizes
 226                 $self = $this->img->getRepoName() . ':' . $this->img->getName();
 227                 $size = $this->img->getSize();
 228                 foreach ( $dupes as $index => $file ) {
 229                         $key = $file->getRepoName() . ':' . $file->getName();
 230                         if ( $key == $self ) {
 231                                 unset( $dupes[$index] );
 232                         }
 233                         if ( $file->getSize() != $size ) {
 234                                 unset( $dupes[$index] );
 235                         }
 236                 }
 237                 return $this->dupes = $dupes;
 238         }
 239
 240         /**
 241          * Create the TOC
 242          *
 243          * @param $metadata Boolean: whether or not to show the metadata link
 244          * @return String
 245          */
 246         protected function showTOC( $metadata ) {
 247                 $r = array(
 248                         '<li><a href="#file">' . wfMsgHtml( 'file-anchor-link' ) . '</a></li>',
 249                         '<li><a href="#filehistory">' . wfMsgHtml( 'filehist' ) . '</a></li>',
 250                         '<li><a href="#filelinks">' . wfMsgHtml( 'imagelinks' ) . '</a></li>',
 251                 );
 252                 if ( $metadata ) {
 253                         $r[] = '<li><a href="#metadata">' . wfMsgHtml( 'metadata' ) . '</a></li>';
 254                 }
 255
 256                 wfRunHooks( 'ImagePageShowTOC', array( $this, &$r ) );
 257
 258                 return '<ul id="filetoc">' . implode( "\n", $r ) . '</ul>';
 259         }
 260
 261         /**
 262          * Make a table with metadata to be shown in the output page.
 263          *
 264          * @todo FIXME: Bad interface, see note on MediaHandler::formatMetadata().
 265          *
 266          * @param $metadata Array: the array containing the EXIF data
 267          * @return String The metadata table. This is treated as Wikitext (!)
 268          */
 269         protected function makeMetadataTable( $metadata ) {
 270                 $r = "<div class=\"mw-imagepage-section-metadata\">";
 271                 $r .= wfMsgNoTrans( 'metadata-help' );
 272                 $r .= "<table id=\"mw_metadata\" class=\"mw_metadata\">\n";
 273                 foreach ( $metadata as $type => $stuff ) {
 274                         foreach ( $stuff as $v ) {
 275                                 # @todo FIXME: Why is this using escapeId for a class?!
 276                                 $class = Sanitizer::escapeId( $v['id'] );
 277                                 if ( $type == 'collapsed' ) {
 278                                         $class .= ' collapsable';
 279                                 }
 280                                 $r .= "<tr class=\"$class\">\n";
 281                                 $r .= "<th>{$v['name']}</th>\n";
 282                                 $r .= "<td>{$v['value']}</td>\n</tr>";
 283                         }
 284                 }
 285                 $r .= "</table>\n</div>\n";
 286                 return $r;
 287         }
 288
 289         /**
 290          * Overloading Article's getContent method.
 291          *
 292          * Omit noarticletext if sharedupload; text will be fetched from the
 293          * shared upload server if possible.
 294          */
 295         public function getContent() {
 296                 $this->loadFile();
 297                 if ( $this->img && !$this->img->isLocal() && 0 == $this->getID() ) {
 298                         return '';
 299                 }
 300                 return parent::getContent();
 301         }
 302
 303         protected function openShowImage() {
 304                 global $wgOut, $wgUser, $wgImageLimits, $wgRequest,
 305                         $wgLang, $wgContLang, $wgEnableUploads;
 306
 307                 $this->loadFile();
 308
 309                 $sizeSel = intval( $wgUser->getOption( 'imagesize' ) );
 310                 if ( !isset( $wgImageLimits[$sizeSel] ) ) {
 311                         $sizeSel = User::getDefaultOption( 'imagesize' );
 312
 313                         // The user offset might still be incorrect, specially if
 314                         // $wgImageLimits got changed (see bug #8858).
 315                         if ( !isset( $wgImageLimits[$sizeSel] ) ) {
 316                                 // Default to the first offset in $wgImageLimits
 317                                 $sizeSel = 0;
 318                         }
 319                 }
 320                 $max = $wgImageLimits[$sizeSel];
 321                 $maxWidth = $max[0];
 322                 $maxHeight = $max[1];
 323                 $sk = $wgUser->getSkin();
 324                 $dirmark = $wgContLang->getDirMark();
 325
 326                 if ( $this->displayImg->exists() ) {
 327                         # image
 328                         $page = $wgRequest->getIntOrNull( 'page' );
 329                         if ( is_null( $page ) ) {
 330                                 $params = array();
 331                                 $page = 1;
 332                         } else {
 333                                 $params = array( 'page' => $page );
 334                         }
 335                         $width_orig = $this->displayImg->getWidth( $page );
 336                         $width = $width_orig;
 337                         $height_orig = $this->displayImg->getHeight( $page );
 338                         $height = $height_orig;
 339
 340                         $longDesc = wfMsg( 'parentheses', $this->displayImg->getLongDesc() );
 341
 342                         wfRunHooks( 'ImageOpenShowImageInlineBefore', array( &$this, &$wgOut ) );
 343
 344                         if ( $this->displayImg->allowInlineDisplay() ) {
 345                                 # image
 346
 347                                 # "Download high res version" link below the image
 348                                 # $msgsize = wfMsgHtml( 'file-info-size', $width_orig, $height_orig, $sk->formatSize( $this->displayImg->getSize() ), $mime );
 349                                 # We'll show a thumbnail of this image
 350                                 if ( $width > $maxWidth || $height > $maxHeight ) {
 351                                         # Calculate the thumbnail size.
 352                                         # First case, the limiting factor is the width, not the height.
 353                                         if ( $width / $height >= $maxWidth / $maxHeight ) {
 354                                                 $height = round( $height * $maxWidth / $width );
 355                                                 $width = $maxWidth;
 356                                                 # Note that $height <= $maxHeight now.
 357                                         } else {
 358                                                 $newwidth = floor( $width * $maxHeight / $height );
 359                                                 $height = round( $height * $newwidth / $width );
 360                                                 $width = $newwidth;
 361                                                 # Note that $height <= $maxHeight now, but might not be identical
 362                                                 # because of rounding.
 363                                         }
 364                                         $msgbig  = wfMsgHtml( 'show-big-image' );
 365                                         $otherSizes = array();
 366                                         foreach ( $wgImageLimits as $size ) {
 367                                                 if ( $size[0] < $width_orig && $size[1] < $height_orig &&
 368                                                                 $size[0] != $width && $size[1] != $height ) {
 369                                                         $otherSizes[] = $this->makeSizeLink( $params, $size[0], $size[1] );
 370                                                 }
 371                                         }
 372                                         $msgsmall = wfMessage( 'show-big-image-preview' )->
 373                                                 rawParams( $this->makeSizeLink( $params, $width, $height ) )->
 374                                                 parse() . ' ' .
 375                                                 wfMessage( 'show-big-image-other' )->
 376                                                 rawParams( $wgLang->pipeList( $otherSizes ) )->parse();
 377                                 } else {
 378                                         # Image is small enough to show full size on image page
 379                                         $msgsmall = wfMsgExt( 'file-nohires', array( 'parseinline' ) );
 380                                 }
 381
 382                                 $params['width'] = $width;
 383                                 $params['height'] = $height;
 384                                 $thumbnail = $this->displayImg->transform( $params );
 385
 386                                 $showLink = true;
 387                                 $anchorclose = '<br />' . $msgsmall;
 388
 389                                 $isMulti = $this->displayImg->isMultipage() && $this->displayImg->pageCount() > 1;
 390                                 if ( $isMulti ) {
 391                                         $wgOut->addHTML( '<table class="multipageimage"><tr><td>' );
 392                                 }
 393
 394                                 if ( $thumbnail ) {
 395                                         $options = array(
 396                                                 'alt' => $this->displayImg->getTitle()->getPrefixedText(),
 397                                                 'file-link' => true,
 398                                         );
 399                                         $wgOut->addHTML( '<div class="fullImageLink" id="file">' .
 400                                                 $thumbnail->toHtml( $options ) .
 401                                                 $anchorclose . "</div>\n" );
 402                                 }
 403
 404                                 if ( $isMulti ) {
 405                                         $count = $this->displayImg->pageCount();
 406
 407                                         if ( $page > 1 ) {
 408                                                 $label = $wgOut->parse( wfMsg( 'imgmultipageprev' ), false );
 409                                                 $link = $sk->link(
 410                                                         $this->mTitle,
 411                                                         $label,
 412                                                         array(),
 413                                                         array( 'page' => $page - 1 ),
 414                                                         array( 'known', 'noclasses' )
 415                                                 );
 416                                                 $thumb1 = $sk->makeThumbLinkObj( $this->mTitle, $this->displayImg, $link, $label, 'none',
 417                                                         array( 'page' => $page - 1 ) );
 418                                         } else {
 419                                                 $thumb1 = '';
 420                                         }
 421
 422                                         if ( $page < $count ) {
 423                                                 $label = wfMsg( 'imgmultipagenext' );
 424                                                 $link = $sk->link(
 425                                                         $this->mTitle,
 426                                                         $label,
 427                                                         array(),
 428                                                         array( 'page' => $page + 1 ),
 429                                                         array( 'known', 'noclasses' )
 430                                                 );
 431                                                 $thumb2 = $sk->makeThumbLinkObj( $this->mTitle, $this->displayImg, $link, $label, 'none',
 432                                                         array( 'page' => $page + 1 ) );
 433                                         } else {
 434                                                 $thumb2 = '';
 435                                         }
 436
 437                                         global $wgScript;
 438
 439                                         $formParams = array(
 440                                                 'name' => 'pageselector',
 441                                                 'action' => $wgScript,
 442                                                 'onchange' => 'document.pageselector.submit();',
 443                                         );
 444
 445                                         for ( $i = 1; $i <= $count; $i++ ) {
 446                                                 $options[] = Xml::option( $wgLang->formatNum( $i ), $i, $i == $page );
 447                                         }
 448                                         $select = Xml::tags( 'select',
 449                                                 array( 'id' => 'pageselector', 'name' => 'page' ),
 450                                                 implode( "\n", $options ) );
 451
 452                                         $wgOut->addHTML(
 453                                                 '</td><td><div class="multipageimagenavbox">' .
 454                                                 Xml::openElement( 'form', $formParams ) .
 455                                                 Html::hidden( 'title', $this->getTitle()->getPrefixedDBkey() ) .
 456                                                 wfMsgExt( 'imgmultigoto', array( 'parseinline', 'replaceafter' ), $select ) .
 457                                                 Xml::submitButton( wfMsg( 'imgmultigo' ) ) .
 458                                                 Xml::closeElement( 'form' ) .
 459                                                 "<hr />$thumb1\n$thumb2<br clear=\"all\" /></div></td></tr></table>"
 460                                         );
 461                                 }
 462                         } else {
 463                                 # if direct link is allowed but it's not a renderable image, show an icon.
 464                                 if ( $this->displayImg->isSafeFile() ) {
 465                                         $icon = $this->displayImg->iconThumb();
 466
 467                                         $wgOut->addHTML( '<div class="fullImageLink" id="file">' .
 468                                                 $icon->toHtml( array( 'file-link' => true ) ) .
 469                                                 "</div>\n" );
 470                                 }
 471
 472                                 $showLink = true;
 473                         }
 474
 475                         if ( $showLink ) {
 476                                 $filename = wfEscapeWikiText( $this->displayImg->getName() );
 477                                 $linktext = $filename;
 478                                 if ( isset( $msgbig ) ) {
 479                                         $linktext = wfEscapeWikiText( $msgbig );
 480                                 }
 481                                 $medialink = "[[Media:$filename|$linktext]]";
 482
 483                                 if ( !$this->displayImg->isSafeFile() ) {
 484                                         $warning = wfMsgNoTrans( 'mediawarning' );
 485                                         $wgOut->addWikiText( <<<EOT
 486 <div class="fullMedia"><span class="dangerousLink">{$medialink}</span>$dirmark <span class="fileInfo">$longDesc</span></div>
 487 <div class="mediaWarning">$warning</div>
 488 EOT
 489                                                 );
 490                                 } else {
 491                                         $wgOut->addWikiText( <<<EOT
 492 <div class="fullMedia">{$medialink}{$dirmark} <span class="fileInfo">$longDesc</span>
 493 </div>
 494 EOT
 495                                         );
 496                                 }
 497                         }
 498
 499                         if ( !$this->displayImg->isLocal() ) {
 500                                 $this->printSharedImageText();
 501                         }
 502                 } else {
 503                         # Image does not exist
 504                         if ( $wgEnableUploads && $wgUser->isAllowed( 'upload' ) ) {
 505                                 // Only show an upload link if the user can upload
 506                                 $uploadTitle = SpecialPage::getTitleFor( 'Upload' );
 507                                 $nofile = array(
 508                                         'filepage-nofile-link',
 509                                         $uploadTitle->getFullURL( array( 'wpDestFile' => $this->img->getName() ) )
 510                                 );
 511                         } else {
 512                                 $nofile = 'filepage-nofile';
 513                         }
 514                         // Note, if there is an image description page, but
 515                         // no image, then this setRobotPolicy is overriden
 516                         // by Article::View().
 517                         $wgOut->setRobotPolicy( 'noindex,nofollow' );
 518                         $wgOut->wrapWikiMsg( "<div id='mw-imagepage-nofile' class='plainlinks'>\n$1\n</div>", $nofile );
 519                         if ( !$this->getID() ) {
 520                                 // If there is no image, no shared image, and no description page,
 521                                 // output a 404, to be consistent with articles.
 522                                 $wgRequest->response()->header( 'HTTP/1.1 404 Not Found' );
 523                         }
 524                 }
 525         }
 526
 527         /**
 528          * Creates an thumbnail of specified size and returns an HTML link to it
 529          * @param array $params Scaler parameters
 530          * @param int $width
 531          * @param int $height
 532          */
 533         private function makeSizeLink( $params, $width, $height ) {
 534                 $params['width'] = $width;
 535                 $params['height'] = $height;
 536                 $thumbnail = $this->displayImg->transform( $params );
 537                 if ( $thumbnail && !$thumbnail->isError() ) {
 538                         return Html::rawElement( 'a', array(
 539                                 'href' => $thumbnail->getUrl(),
 540                                 'class' => 'mw-thumbnail-link'
 541                                 ), wfMessage( 'show-big-image-size' )->numParams(
 542                                         $thumbnail->getWidth(), $thumbnail->getHeight()
 543                                 )->parse() );
 544                 } else {
 545                         return '';
 546                 }
 547         }
 548
 549         /**
 550          * Show a notice that the file is from a shared repository
 551          */
 552         protected function printSharedImageText() {
 553                 global $wgOut;
 554
 555                 $this->loadFile();
 556
 557                 $descUrl = $this->img->getDescriptionUrl();
 558                 $descText = $this->img->getDescriptionText();
 559
 560                 /* Add canonical to head if there is no local page for this shared file */
 561                 if( $descUrl && $this->getID() == 0 ) {
 562                         $wgOut->addLink( array( 'rel' => 'canonical', 'href' => $descUrl ) );
 563                 }
 564
 565                 $wrap = "<div class=\"sharedUploadNotice\">\n$1\n</div>\n";
 566                 $repo = $this->img->getRepo()->getDisplayName();
 567
 568                 if ( $descUrl && $descText && wfMsgNoTrans( 'sharedupload-desc-here' ) !== '-'  ) {
 569                         $wgOut->wrapWikiMsg( $wrap, array( 'sharedupload-desc-here', $repo, $descUrl ) );
 570                 } elseif ( $descUrl && wfMsgNoTrans( 'sharedupload-desc-there' ) !== '-' ) {
 571                         $wgOut->wrapWikiMsg( $wrap, array( 'sharedupload-desc-there', $repo, $descUrl ) );
 572                 } else {
 573                         $wgOut->wrapWikiMsg( $wrap, array( 'sharedupload', $repo ), ''/*BACKCOMPAT*/ );
 574                 }
 575
 576                 if ( $descText ) {
 577                         $this->mExtraDescription = $descText;
 578                 }
 579         }
 580
 581         public function getUploadUrl() {
 582                 $this->loadFile();
 583                 $uploadTitle = SpecialPage::getTitleFor( 'Upload' );
 584                 return $uploadTitle->getFullURL( array(
 585                         'wpDestFile' => $this->img->getName(),
 586                         'wpForReUpload' => 1
 587                  ) );
 588         }
 589
 590         /**
 591          * Print out the various links at the bottom of the image page, e.g. reupload,
 592          * external editing (and instructions link) etc.
 593          */
 594         protected function uploadLinksBox() {
 595                 global $wgUser, $wgOut, $wgEnableUploads, $wgUseExternalEditor;
 596
 597                 if ( !$wgEnableUploads ) {
 598                         return;
 599                 }
 600
 601                 $this->loadFile();
 602                 if ( !$this->img->isLocal() ) {
 603                         return;
 604                 }
 605
 606                 $sk = $wgUser->getSkin();
 607
 608                 $wgOut->addHTML( "<br /><ul>\n" );
 609
 610                 # "Upload a new version of this file" link
 611                 if ( UploadBase::userCanReUpload( $wgUser, $this->img->name ) ) {
 612                         $ulink = $sk->makeExternalLink( $this->getUploadUrl(), wfMsg( 'uploadnewversion-linktext' ) );
 613                         $wgOut->addHTML( "<li id=\"mw-imagepage-reupload-link\"><div class=\"plainlinks\">{$ulink}</div></li>\n" );
 614                 }
 615
 616                 # External editing link
 617                 if ( $wgUseExternalEditor ) {
 618                         $elink = $sk->link(
 619                                 $this->mTitle,
 620                                 wfMsgHtml( 'edit-externally' ),
 621                                 array(),
 622                                 array(
 623                                         'action' => 'edit',
 624                                         'externaledit' => 'true',
 625                                         'mode' => 'file'
 626                                 ),
 627                                 array( 'known', 'noclasses' )
 628                         );
 629                         $wgOut->addHTML(
 630                                 '<li id="mw-imagepage-edit-external">' . $elink . ' <small>' .
 631                                 wfMsgExt( 'edit-externally-help', array( 'parseinline' ) ) .
 632                                 "</small></li>\n"
 633                         );
 634                 }
 635
 636                 $wgOut->addHTML( "</ul>\n" );
 637         }
 638
 639         protected function closeShowImage() { } # For overloading
 640
 641         /**
 642          * If the page we've just displayed is in the "Image" namespace,
 643          * we follow it with an upload history of the image and its usage.
 644          */
 645         protected function imageHistory() {
 646                 global $wgOut;
 647
 648                 $this->loadFile();
 649                 $pager = new ImageHistoryPseudoPager( $this );
 650                 $wgOut->addHTML( $pager->getBody() );
 651                 $wgOut->preventClickjacking( $pager->getPreventClickjacking() );
 652
 653                 $this->img->resetHistory(); // free db resources
 654
 655                 # Exist check because we don't want to show this on pages where an image
 656                 # doesn't exist along with the noimage message, that would suck. -ævar
 657                 if ( $this->img->exists() ) {
 658                         $this->uploadLinksBox();
 659                 }
 660         }
 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 )
 671                 );
 672         }
 673
 674         protected function imageLinks() {
 675                 global $wgUser, $wgOut, $wgLang;
 676
 677                 $limit = 100;
 678
 679                 $res = $this->queryImageLinks( $this->mTitle->getDbKey(), $limit + 1);
 680                 $rows = array();
 681                 $redirects = array();
 682                 foreach ( $res as $row ) {
 683                         if ( $row->page_is_redirect ) {
 684                                 $redirects[$row->page_title] = array();
 685                         }
 686                         $rows[] = $row;
 687                 }
 688                 $count = count( $rows );
 689
 690                 $hasMore = $count > $limit;
 691                 if ( !$hasMore && count( $redirects ) ) {
 692                         $res = $this->queryImageLinks( array_keys( $redirects ),
 693                                 $limit - count( $rows ) + 1 );
 694                         foreach ( $res as $row ) {
 695                                 $redirects[$row->il_to][] = $row;
 696                                 $count++;
 697                         }
 698                         $hasMore = ( $res->numRows() + count( $rows ) ) > $limit;
 699                 }
 700
 701                 if ( $count == 0 ) {
 702                         $wgOut->wrapWikiMsg(
 703                                 Html::rawElement( 'div',
 704                                         array( 'id' => 'mw-imagepage-nolinkstoimage' ), "\n$1\n" ),
 705                                 'nolinkstoimage'
 706                         );
 707                         return;
 708                 }
 709
 710                 $wgOut->addHTML( "<div id='mw-imagepage-section-linkstoimage'>\n" );
 711                 if ( !$hasMore ) {
 712                         $wgOut->addWikiMsg( 'linkstoimage', $count );
 713                 } else {
 714                         // More links than the limit. Add a link to [[Special:Whatlinkshere]]
 715                         $wgOut->addWikiMsg( 'linkstoimage-more',
 716                                 $wgLang->formatNum( $limit ),
 717                                 $this->mTitle->getPrefixedDBkey()
 718                         );
 719                 }
 720
 721                 $wgOut->addHTML(
 722                         Html::openElement( 'ul',
 723                                 array( 'class' => 'mw-imagepage-linkstoimage' ) ) . "\n"
 724                 );
 725                 $sk = $wgUser->getSkin();
 726                 $count = 0;
 727
 728                 // Sort the list by namespace:title
 729                 usort( $rows, array( $this, 'compare' ) );
 730
 731                 // Create links for every element
 732                 $currentCount = 0;
 733                 foreach( $rows as $element ) {
 734                         $currentCount++;
 735                         if ( $currentCount > $limit ) {
 736                                 break;
 737                         }
 738
 739                         $link = $sk->linkKnown( Title::makeTitle( $element->page_namespace, $element->page_title ) );
 740                         if ( !isset( $redirects[$element->page_title] ) ) {
 741                                 $liContents = $link;
 742                         } else {
 743                                 $ul = "<ul class='mw-imagepage-redirectstofile'>\n";
 744                                 foreach ( $redirects[$element->page_title] as $row ) {
 745                                         $currentCount++;
 746                                         if ( $currentCount > $limit ) {
 747                                                 break;
 748                                         }
 749
 750                                         $link2 = $sk->linkKnown( Title::makeTitle( $row->page_namespace, $row->page_title ) );
 751                                         $ul .= Html::rawElement(
 752                                                 'li',
 753                                                 array( 'id' => 'mw-imagepage-linkstoimage-ns' . $element->page_namespace ),
 754                                                 $link2
 755                                                 ) . "\n";
 756                                 }
 757                                 $ul .= '</ul>';
 758                                 $liContents = wfMessage( 'linkstoimage-redirect' )->rawParams(
 759                                         $link, $ul )->parse();
 760                         }
 761                         $wgOut->addHTML( Html::rawElement(
 762                                         'li',
 763                                         array( 'id' => 'mw-imagepage-linkstoimage-ns' . $element->page_namespace ),
 764                                         $liContents
 765                                 ) . "\n"
 766                         );
 767
 768                 };
 769                 $wgOut->addHTML( Html::closeElement( 'ul' ) . "\n" );
 770                 $res->free();
 771
 772                 // Add a links to [[Special:Whatlinkshere]]
 773                 if ( $count > $limit ) {
 774                         $wgOut->addWikiMsg( 'morelinkstoimage', $this->mTitle->getPrefixedDBkey() );
 775                 }
 776                 $wgOut->addHTML( Html::closeElement( 'div' ) . "\n" );
 777         }
 778
 779         protected function imageDupes() {
 780                 global $wgOut, $wgUser, $wgLang;
 781
 782                 $this->loadFile();
 783
 784                 $dupes = $this->getDuplicates();
 785                 if ( count( $dupes ) == 0 ) {
 786                         return;
 787                 }
 788
 789                 $wgOut->addHTML( "<div id='mw-imagepage-section-duplicates'>\n" );
 790                 $wgOut->addWikiMsg( 'duplicatesoffile',
 791                         $wgLang->formatNum( count( $dupes ) ), $this->mTitle->getDBkey()
 792                 );
 793                 $wgOut->addHTML( "<ul class='mw-imagepage-duplicates'>\n" );
 794
 795                 $sk = $wgUser->getSkin();
 796                 foreach ( $dupes as $file ) {
 797                         $fromSrc = '';
 798                         if ( $file->isLocal() ) {
 799                                 $link = $sk->link(
 800                                         $file->getTitle(),
 801                                         null,
 802                                         array(),
 803                                         array(),
 804                                         array( 'known', 'noclasses' )
 805                                 );
 806                         } else {
 807                                 $link = $sk->makeExternalLink( $file->getDescriptionUrl(),
 808                                         $file->getTitle()->getPrefixedText() );
 809                                 $fromSrc = wfMsg( 'shared-repo-from', $file->getRepo()->getDisplayName() );
 810                         }
 811                         $wgOut->addHTML( "<li>{$link} {$fromSrc}</li>\n" );
 812                 }
 813                 $wgOut->addHTML( "</ul></div>\n" );
 814         }
 815
 816         /**
 817          * Delete the file, or an earlier version of it
 818          */
 819         public function delete() {
 820                 global $wgUploadMaintenance;
 821                 if ( $wgUploadMaintenance && $this->mTitle && $this->mTitle->getNamespace() == NS_FILE ) {
 822                         global $wgOut;
 823                         $wgOut->wrapWikiMsg( "<div class='error'>\n$1\n</div>\n", array( 'filedelete-maintenance' ) );
 824                         return;
 825                 }
 826
 827                 $this->loadFile();
 828                 if ( !$this->img->exists() || !$this->img->isLocal() || $this->img->getRedirected() ) {
 829                         // Standard article deletion
 830                         parent::delete();
 831                         return;
 832                 }
 833                 $deleter = new FileDeleteForm( $this->img );
 834                 $deleter->execute();
 835         }
 836
 837         /**
 838          * Revert the file to an earlier version
 839          */
 840         public function revert() {
 841                 $this->loadFile();
 842                 $reverter = new FileRevertForm( $this->img );
 843                 $reverter->execute();
 844         }
 845
 846         /**
 847          * Override handling of action=purge
 848          */
 849         public function doPurge() {
 850                 $this->loadFile();
 851                 if ( $this->img->exists() ) {
 852                         wfDebug( 'ImagePage::doPurge purging ' . $this->img->getName() . "\n" );
 853                         $update = new HTMLCacheUpdate( $this->mTitle, 'imagelinks' );
 854                         $update->doUpdate();
 855                         $this->img->upgradeRow();
 856                         $this->img->purgeCache();
 857                 } else {
 858                         wfDebug( 'ImagePage::doPurge no image for ' . $this->img->getName() . "; limiting purge to cache only\n" );
 859                         // even if the file supposedly doesn't exist, force any cached information
 860                         // to be updated (in case the cached information is wrong)
 861                         $this->img->purgeCache();
 862                 }
 863                 parent::doPurge();
 864         }
 865
 866         /**
 867          * Display an error with a wikitext description
 868          */
 869         function showError( $description ) {
 870                 global $wgOut;
 871                 $wgOut->setPageTitle( wfMsg( 'internalerror' ) );
 872                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
 873                 $wgOut->setArticleRelated( false );
 874                 $wgOut->enableClientCache( false );
 875                 $wgOut->addWikiText( $description );
 876         }
 877
 878         /**
 879          * Callback for usort() to do link sorts by (namespace, title)
 880          * Function copied from Title::compare()
 881          *
 882          * @param $a object page to compare with
 883          * @param $b object page to compare with
 884          * @return Integer: result of string comparison, or namespace comparison
 885          */
 886         protected function compare( $a, $b ) {
 887                 if ( $a->page_namespace == $b->page_namespace ) {
 888                         return strcmp( $a->page_title, $b->page_title );
 889                 } else {
 890                         return $a->page_namespace - $b->page_namespace;
 891                 }
 892         }
 893 }
 894
 895 /**
 896  * Builds the image revision log shown on image pages
 897  *
 898  * @ingroup Media
 899  */
 900 class ImageHistoryList {
 901
 902         /**
 903          * @var Title
 904          */
 905         protected $title;
 906
 907         /**
 908          * @var File
 909          */
 910         protected $img;
 911
 912         /**
 913          * @var ImagePage
 914          */
 915         protected $imagePage;
 916
 917         /**
 918          * @var Skin
 919          */
 920         protected $skin;
 921
 922         protected $repo, $showThumb;
 923         protected $preventClickjacking = false;
 924
 925         /**
 926          * @param ImagePage $imagePage
 927          */
 928         public function __construct( $imagePage ) {
 929                 global $wgUser, $wgShowArchiveThumbnails;
 930                 $this->skin = $wgUser->getSkin();
 931                 $this->current = $imagePage->getFile();
 932                 $this->img = $imagePage->getDisplayedFile();
 933                 $this->title = $imagePage->getTitle();
 934                 $this->imagePage = $imagePage;
 935                 $this->showThumb = $wgShowArchiveThumbnails && $this->img->canRender();
 936         }
 937
 938         public function getImagePage() {
 939                 return $this->imagePage;
 940         }
 941
 942         public function getSkin() {
 943                 return $this->skin;
 944         }
 945
 946         public function getFile() {
 947                 return $this->img;
 948         }
 949
 950         public function beginImageHistoryList( $navLinks = '' ) {
 951                 global $wgOut, $wgUser;
 952                 return Xml::element( 'h2', array( 'id' => 'filehistory' ), wfMsg( 'filehist' ) ) . "\n"
 953                         . "<div id=\"mw-imagepage-section-filehistory\">\n"
 954                         . $wgOut->parse( wfMsgNoTrans( 'filehist-help' ) )
 955                         . $navLinks . "\n"
 956                         . Xml::openElement( 'table', array( 'class' => 'wikitable filehistory' ) ) . "\n"
 957                         . '<tr><td></td>'
 958                         . ( $this->current->isLocal() && ( $wgUser->isAllowedAny( 'delete', 'deletedhistory' ) ) ? '<td></td>' : '' )
 959                         . '<th>' . wfMsgHtml( 'filehist-datetime' ) . '</th>'
 960                         . ( $this->showThumb ? '<th>' . wfMsgHtml( 'filehist-thumb' ) . '</th>' : '' )
 961                         . '<th>' . wfMsgHtml( 'filehist-dimensions' ) . '</th>'
 962                         . '<th>' . wfMsgHtml( 'filehist-user' ) . '</th>'
 963                         . '<th>' . wfMsgHtml( 'filehist-comment' ) . '</th>'
 964                         . "</tr>\n";
 965         }
 966
 967         public function endImageHistoryList( $navLinks = '' ) {
 968                 return "</table>\n$navLinks\n</div>\n";
 969         }
 970
 971         /**
 972          * @param $iscur
 973          * @param $file File
 974          * @return string
 975          */
 976         public function imageHistoryLine( $iscur, $file ) {
 977                 global $wgUser, $wgLang;
 978
 979                 $timestamp = wfTimestamp( TS_MW, $file->getTimestamp() );
 980                 $img = $iscur ? $file->getName() : $file->getArchiveName();
 981                 $user = $file->getUser( 'id' );
 982                 $usertext = $file->getUser( 'text' );
 983                 $description = $file->getDescription();
 984
 985                 $local = $this->current->isLocal();
 986                 $row = $selected = '';
 987
 988                 // Deletion link
 989                 if ( $local && ( $wgUser->isAllowedAny( 'delete', 'deletedhistory' ) ) ) {
 990                         $row .= '<td>';
 991                         # Link to remove from history
 992                         if ( $wgUser->isAllowed( 'delete' ) ) {
 993                                 $q = array( 'action' => 'delete' );
 994                                 if ( !$iscur ) {
 995                                         $q['oldimage'] = $img;
 996                                 }
 997                                 $row .= $this->skin->link(
 998                                         $this->title,
 999                                         wfMsgHtml( $iscur ? 'filehist-deleteall' : 'filehist-deleteone' ),
1000                                         array(), $q, array( 'known' )
1001                                 );
1002                         }
1003                         # Link to hide content. Don't show useless link to people who cannot hide revisions.
1004                         $canHide = $wgUser->isAllowed( 'deleterevision' );
1005                         if ( $canHide || ( $wgUser->isAllowed( 'deletedhistory' ) && $file->getVisibility() ) ) {
1006                                 if ( $wgUser->isAllowed( 'delete' ) ) {
1007                                         $row .= '<br />';
1008                                 }
1009                                 // If file is top revision or locked from this user, don't link
1010                                 if ( $iscur || !$file->userCan( File::DELETED_RESTRICTED ) ) {
1011                                         $del = $this->skin->revDeleteLinkDisabled( $canHide );
1012                                 } else {
1013                                         list( $ts, $name ) = explode( '!', $img, 2 );
1014                                         $query = array(
1015                                                 'type'   => 'oldimage',
1016                                                 'target' => $this->title->getPrefixedText(),
1017                                                 'ids'    => $ts,
1018                                         );
1019                                         $del = $this->skin->revDeleteLink( $query,
1020                                                 $file->isDeleted( File::DELETED_RESTRICTED ), $canHide );
1021                                 }
1022                                 $row .= $del;
1023                         }
1024                         $row .= '</td>';
1025                 }
1026
1027                 // Reversion link/current indicator
1028                 $row .= '<td>';
1029                 if ( $iscur ) {
1030                         $row .= wfMsgHtml( 'filehist-current' );
1031                 } elseif ( $local && $wgUser->isLoggedIn() && $this->title->userCan( 'edit' ) ) {
1032                         if ( $file->isDeleted( File::DELETED_FILE ) ) {
1033                                 $row .= wfMsgHtml( 'filehist-revert' );
1034                         } else {
1035                                 $row .= $this->skin->link(
1036                                         $this->title,
1037                                         wfMsgHtml( 'filehist-revert' ),
1038                                         array(),
1039                                         array(
1040                                                 'action' => 'revert',
1041                                                 'oldimage' => $img,
1042                                                 'wpEditToken' => $wgUser->editToken( $img )
1043                                         ),
1044                                         array( 'known', 'noclasses' )
1045                                 );
1046                         }
1047                 }
1048                 $row .= '</td>';
1049
1050                 // Date/time and image link
1051                 if ( $file->getTimestamp() === $this->img->getTimestamp() ) {
1052                         $selected = "class='filehistory-selected'";
1053                 }
1054                 $row .= "<td $selected style='white-space: nowrap;'>";
1055                 if ( !$file->userCan( File::DELETED_FILE ) ) {
1056                         # Don't link to unviewable files
1057                         $row .= '<span class="history-deleted">' . $wgLang->timeAndDate( $timestamp, true ) . '</span>';
1058                 } elseif ( $file->isDeleted( File::DELETED_FILE ) ) {
1059                         if ( $local ) {
1060                                 $this->preventClickjacking();
1061                                 $revdel = SpecialPage::getTitleFor( 'Revisiondelete' );
1062                                 # Make a link to review the image
1063                                 $url = $this->skin->link(
1064                                         $revdel,
1065                                         $wgLang->timeAndDate( $timestamp, true ),
1066                                         array(),
1067                                         array(
1068                                                 'target' => $this->title->getPrefixedText(),
1069                                                 'file' => $img,
1070                                                 'token' => $wgUser->editToken( $img )
1071                                         ),
1072                                         array( 'known', 'noclasses' )
1073                                 );
1074                         } else {
1075                                 $url = $wgLang->timeAndDate( $timestamp, true );
1076                         }
1077                         $row .= '<span class="history-deleted">' . $url . '</span>';
1078                 } else {
1079                         $url = $iscur ? $this->current->getUrl() : $this->current->getArchiveUrl( $img );
1080                         $row .= Xml::element( 'a', array( 'href' => $url ), $wgLang->timeAndDate( $timestamp, true ) );
1081                 }
1082                 $row .= "</td>";
1083
1084                 // Thumbnail
1085                 if ( $this->showThumb ) {
1086                         $row .= '<td>' . $this->getThumbForLine( $file ) . '</td>';
1087                 }
1088
1089                 // Image dimensions + size
1090                 $row .= '<td>';
1091                 $row .= htmlspecialchars( $file->getDimensionsString() );
1092                 $row .= ' <span style="white-space: nowrap;">(' . $this->skin->formatSize( $file->getSize() ) . ')</span>';
1093                 $row .= '</td>';
1094
1095                 // Uploading user
1096                 $row .= '<td>';
1097                 // Hide deleted usernames
1098                 if ( $file->isDeleted( File::DELETED_USER ) ) {
1099                         $row .= '<span class="history-deleted">' . wfMsgHtml( 'rev-deleted-user' ) . '</span>';
1100                 } else {
1101                         if ( $local ) {
1102                                 $row .= $this->skin->userLink( $user, $usertext ) . ' <span style="white-space: nowrap;">' .
1103                                 $this->skin->userToolLinks( $user, $usertext ) . '</span>';
1104                         } else {
1105                                 $row .= htmlspecialchars( $usertext );
1106                         }
1107                 }
1108                 $row .= '</td><td>';
1109
1110                 // Don't show deleted descriptions
1111                 if ( $file->isDeleted( File::DELETED_COMMENT ) ) {
1112                         $row .= '<span class="history-deleted">' . wfMsgHtml( 'rev-deleted-comment' ) . '</span>';
1113                 } else {
1114                         $row .= $this->skin->commentBlock( $description, $this->title, false, false );
1115                 }
1116                 $row .= '</td>';
1117
1118                 $rowClass = null;
1119                 wfRunHooks( 'ImagePageFileHistoryLine', array( $this, $file, &$row, &$rowClass ) );
1120                 $classAttr = $rowClass ? " class='$rowClass'" : '';
1121
1122                 return "<tr{$classAttr}>{$row}</tr>\n";
1123         }
1124
1125         /**
1126          * @param $file File
1127          * @return string
1128          */
1129         protected function getThumbForLine( $file ) {
1130                 global $wgLang;
1131
1132                 if ( $file->allowInlineDisplay() && $file->userCan( File::DELETED_FILE ) && !$file->isDeleted( File::DELETED_FILE ) ) {
1133                         $params = array(
1134                                 'width' => '120',
1135                                 'height' => '120',
1136                         );
1137                         $timestamp = wfTimestamp( TS_MW, $file->getTimestamp() );
1138
1139                         $thumbnail = $file->transform( $params );
1140                         $options = array(
1141                                 'alt' => wfMsg( 'filehist-thumbtext',
1142                                         $wgLang->timeAndDate( $timestamp, true ),
1143                                         $wgLang->date( $timestamp, true ),
1144                                         $wgLang->time( $timestamp, true ) ),
1145                                 'file-link' => true,
1146                         );
1147
1148                         if ( !$thumbnail ) {
1149                                 return wfMsgHtml( 'filehist-nothumb' );
1150                         }
1151
1152                         return $thumbnail->toHtml( $options );
1153                 } else {
1154                         return wfMsgHtml( 'filehist-nothumb' );
1155                 }
1156         }
1157
1158         protected function preventClickjacking( $enable = true ) {
1159                 $this->preventClickjacking = $enable;
1160         }
1161
1162         public function getPreventClickjacking() {
1163                 return $this->preventClickjacking;
1164         }
1165 }
1166
1167 class ImageHistoryPseudoPager extends ReverseChronologicalPager {
1168         protected $preventClickjacking = false;
1169
1170         /**
1171          * @var File
1172          */
1173         protected $mImg;
1174
1175         /**
1176          * @var Title
1177          */
1178         protected $mTitle;
1179
1180         /**
1181          * @param ImagePage $imagePage
1182          */
1183         function __construct( $imagePage ) {
1184                 parent::__construct();
1185                 $this->mImagePage = $imagePage;
1186                 $this->mTitle = clone ( $imagePage->getTitle() );
1187                 $this->mTitle->setFragment( '#filehistory' );
1188                 $this->mImg = null;
1189                 $this->mHist = array();
1190                 $this->mRange = array( 0, 0 ); // display range
1191         }
1192
1193         function getTitle() {
1194                 return $this->mTitle;
1195         }
1196
1197         function getQueryInfo() {
1198                 return false;
1199         }
1200
1201         function getIndexField() {
1202                 return '';
1203         }
1204
1205         function formatRow( $row ) {
1206                 return '';
1207         }
1208
1209         function getBody() {
1210                 $s = '';
1211                 $this->doQuery();
1212                 if ( count( $this->mHist ) ) {
1213                         $list = new ImageHistoryList( $this->mImagePage );
1214                         # Generate prev/next links
1215                         $navLink = $this->getNavigationBar();
1216                         $s = $list->beginImageHistoryList( $navLink );
1217                         // Skip rows there just for paging links
1218                         for ( $i = $this->mRange[0]; $i <= $this->mRange[1]; $i++ ) {
1219                                 $file = $this->mHist[$i];
1220                                 $s .= $list->imageHistoryLine( !$file->isOld(), $file );
1221                         }
1222                         $s .= $list->endImageHistoryList( $navLink );
1223
1224                         if ( $list->getPreventClickjacking() ) {
1225                                 $this->preventClickjacking();
1226                         }
1227                 }
1228                 return $s;
1229         }
1230
1231         function doQuery() {
1232                 if ( $this->mQueryDone ) {
1233                         return;
1234                 }
1235                 $this->mImg = $this->mImagePage->getFile(); // ensure loading
1236                 if ( !$this->mImg->exists() ) {
1237                         return;
1238                 }
1239                 $queryLimit = $this->mLimit + 1; // limit plus extra row
1240                 if ( $this->mIsBackwards ) {
1241                         // Fetch the file history
1242                         $this->mHist = $this->mImg->getHistory( $queryLimit, null, $this->mOffset, false );
1243                         // The current rev may not meet the offset/limit
1244                         $numRows = count( $this->mHist );
1245                         if ( $numRows <= $this->mLimit && $this->mImg->getTimestamp() > $this->mOffset ) {
1246                                 $this->mHist = array_merge( array( $this->mImg ), $this->mHist );
1247                         }
1248                 } else {
1249                         // The current rev may not meet the offset
1250                         if ( !$this->mOffset || $this->mImg->getTimestamp() < $this->mOffset ) {
1251                                 $this->mHist[] = $this->mImg;
1252                         }
1253                         // Old image versions (fetch extra row for nav links)
1254                         $oiLimit = count( $this->mHist ) ? $this->mLimit : $this->mLimit + 1;
1255                         // Fetch the file history
1256                         $this->mHist = array_merge( $this->mHist,
1257                                 $this->mImg->getHistory( $oiLimit, $this->mOffset, null, false ) );
1258                 }
1259                 $numRows = count( $this->mHist ); // Total number of query results
1260                 if ( $numRows ) {
1261                         # Index value of top item in the list
1262                         $firstIndex = $this->mIsBackwards ?
1263                                 $this->mHist[$numRows - 1]->getTimestamp() : $this->mHist[0]->getTimestamp();
1264                         # Discard the extra result row if there is one
1265                         if ( $numRows > $this->mLimit && $numRows > 1 ) {
1266                                 if ( $this->mIsBackwards ) {
1267                                         # Index value of item past the index
1268                                         $this->mPastTheEndIndex = $this->mHist[0]->getTimestamp();
1269                                         # Index value of bottom item in the list
1270                                         $lastIndex = $this->mHist[1]->getTimestamp();
1271                                         # Display range
1272                                         $this->mRange = array( 1, $numRows - 1 );
1273                                 } else {
1274                                         # Index value of item past the index
1275                                         $this->mPastTheEndIndex = $this->mHist[$numRows - 1]->getTimestamp();
1276                                         # Index value of bottom item in the list
1277                                         $lastIndex = $this->mHist[$numRows - 2]->getTimestamp();
1278                                         # Display range
1279                                         $this->mRange = array( 0, $numRows - 2 );
1280                                 }
1281                         } else {
1282                                 # Setting indexes to an empty string means that they will be
1283                                 # omitted if they would otherwise appear in URLs. It just so
1284                                 # happens that this  is the right thing to do in the standard
1285                                 # UI, in all the relevant cases.
1286                                 $this->mPastTheEndIndex = '';
1287                                 # Index value of bottom item in the list
1288                                 $lastIndex = $this->mIsBackwards ?
1289                                         $this->mHist[0]->getTimestamp() : $this->mHist[$numRows - 1]->getTimestamp();
1290                                 # Display range
1291                                 $this->mRange = array( 0, $numRows - 1 );
1292                         }
1293                 } else {
1294                         $firstIndex = '';
1295                         $lastIndex = '';
1296                         $this->mPastTheEndIndex = '';
1297                 }
1298                 if ( $this->mIsBackwards ) {
1299                         $this->mIsFirst = ( $numRows < $queryLimit );
1300                         $this->mIsLast = ( $this->mOffset == '' );
1301                         $this->mLastShown = $firstIndex;
1302                         $this->mFirstShown = $lastIndex;
1303                 } else {
1304                         $this->mIsFirst = ( $this->mOffset == '' );
1305                         $this->mIsLast = ( $numRows < $queryLimit );
1306                         $this->mLastShown = $lastIndex;
1307                         $this->mFirstShown = $firstIndex;
1308                 }
1309                 $this->mQueryDone = true;
1310         }
1311
1312         protected function preventClickjacking( $enable = true ) {
1313                 $this->preventClickjacking = $enable;
1314         }
1315
1316         public function getPreventClickjacking() {
1317                 return $this->preventClickjacking;
1318         }
1319
1320 }