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