includes/ImagePage.php

   1 <?php
   2 /**
   3  * Special handling for file description pages.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  * http://www.gnu.org/copyleft/gpl.html
  19  *
  20  * @file
  21  */
  22
  23 /**
  24  * Class for viewing MediaWiki file description pages
  25  *
  26  * @ingroup Media
  27  */
  28 class ImagePage extends Article {
  29
  30         /**
  31          * @var File
  32          */
  33         private $displayImg;
  34         /**
  35          * @var FileRepo
  36          */
  37         private $repo;
  38         private $fileLoaded;
  39
  40         var $mExtraDescription = false;
  41
  42         /**
  43          * @param $title Title
  44          * @return WikiFilePage
  45          */
  46         protected function newPage( Title $title ) {
  47                 // Overload mPage with a file-specific page
  48                 return new WikiFilePage( $title );
  49         }
  50
  51         /**
  52          * Constructor from a page id
  53          * @param $id Int article ID to load
  54          * @return ImagePage|null
  55          */
  56         public static function newFromID( $id ) {
  57                 $t = Title::newFromID( $id );
  58                 # @todo FIXME: Doesn't inherit right
  59                 return $t == null ? null : new self( $t );
  60                 # return $t == null ? null : new static( $t ); // PHP 5.3
  61         }
  62
  63         /**
  64          * @param $file File:
  65          * @return void
  66          */
  67         public function setFile( $file ) {
  68                 $this->mPage->setFile( $file );
  69                 $this->displayImg = $file;
  70                 $this->fileLoaded = true;
  71         }
  72
  73         protected function loadFile() {
  74                 if ( $this->fileLoaded ) {
  75                         return;
  76                 }
  77                 $this->fileLoaded = true;
  78
  79                 $this->displayImg = $img = false;
  80                 wfRunHooks( 'ImagePageFindFile', array( $this, &$img, &$this->displayImg ) );
  81                 if ( !$img ) { // not set by hook?
  82                         $img = wfFindFile( $this->getTitle() );
  83                         if ( !$img ) {
  84                                 $img = wfLocalFile( $this->getTitle() );
  85                         }
  86                 }
  87                 $this->mPage->setFile( $img );
  88                 if ( !$this->displayImg ) { // not set by hook?
  89                         $this->displayImg = $img;
  90                 }
  91                 $this->repo = $img->getRepo();
  92         }
  93
  94         /**
  95          * Handler for action=render
  96          * Include body text only; none of the image extras
  97          */
  98         public function render() {
  99                 $this->getContext()->getOutput()->setArticleBodyOnly( true );
 100                 parent::view();
 101         }
 102
 103         public function view() {
 104                 global $wgShowEXIF;
 105
 106                 $out = $this->getContext()->getOutput();
 107                 $request = $this->getContext()->getRequest();
 108                 $diff = $request->getVal( 'diff' );
 109                 $diffOnly = $request->getBool( 'diffonly', $this->getContext()->getUser()->getOption( 'diffonly' ) );
 110
 111                 if ( $this->getTitle()->getNamespace() != NS_FILE || ( isset( $diff ) && $diffOnly ) ) {
 112                         parent::view();
 113                         return;
 114                 }
 115
 116                 $this->loadFile();
 117
 118                 if ( $this->getTitle()->getNamespace() == NS_FILE && $this->mPage->getFile()->getRedirected() ) {
 119                         if ( $this->getTitle()->getDBkey() == $this->mPage->getFile()->getName() || isset( $diff ) ) {
 120                                 // mTitle is the same as the redirect target so ask Article
 121                                 // to perform the redirect for us.
 122                                 $request->setVal( 'diffonly', 'true' );
 123                                 parent::view();
 124                                 return;
 125                         } else {
 126                                 // mTitle is not the same as the redirect target so it is
 127                                 // probably the redirect page itself. Fake the redirect symbol
 128                                 $out->setPageTitle( $this->getTitle()->getPrefixedText() );
 129                                 $out->addHTML( $this->viewRedirect( Title::makeTitle( NS_FILE, $this->mPage->getFile()->getName() ),
 130                                         /* $appendSubtitle */ true, /* $forceKnown */ true ) );
 131                                 $this->mPage->doViewUpdates( $this->getContext()->getUser() );
 132                                 return;
 133                         }
 134                 }
 135
 136                 if ( $wgShowEXIF && $this->displayImg->exists() ) {
 137                         // @todo FIXME: Bad interface, see note on MediaHandler::formatMetadata().
 138                         $formattedMetadata = $this->displayImg->formatMetadata();
 139                         $showmeta = $formattedMetadata !== false;
 140                 } else {
 141                         $showmeta = false;
 142                 }
 143
 144                 if ( !$diff && $this->displayImg->exists() ) {
 145                         $out->addHTML( $this->showTOC( $showmeta ) );
 146                 }
 147
 148                 if ( !$diff ) {
 149                         $this->openShowImage();
 150                 }
 151
 152                 # No need to display noarticletext, we use our own message, output in openShowImage()
 153                 if ( $this->mPage->getID() ) {
 154                         # NS_FILE is in the user language, but this section (the actual wikitext)
 155                         # should be in page content language
 156                         $pageLang = $this->getTitle()->getPageLanguage();
 157                         $out->addHTML( Xml::openElement( 'div', array( 'id' => 'mw-imagepage-content',
 158                                 'lang' => $pageLang->getCode(), 'dir' => $pageLang->getDir(),
 159                                 'class' => 'mw-content-'.$pageLang->getDir() ) ) );
 160                         parent::view();
 161                         $out->addHTML( Xml::closeElement( 'div' ) );
 162                 } else {
 163                         # Just need to set the right headers
 164                         $out->setArticleFlag( true );
 165                         $out->setPageTitle( $this->getTitle()->getPrefixedText() );
 166                         $this->mPage->doViewUpdates( $this->getContext()->getUser() );
 167                 }
 168
 169                 # Show shared description, if needed
 170                 if ( $this->mExtraDescription ) {
 171                         $fol = wfMessage( 'shareddescriptionfollows' );
 172                         if ( !$fol->isDisabled() ) {
 173                                 $out->addWikiText( $fol->plain() );
 174                         }
 175                         $out->addHTML( '<div id="shared-image-desc">' . $this->mExtraDescription . "</div>\n" );
 176                 }
 177
 178                 $this->closeShowImage();
 179                 $this->imageHistory();
 180                 // TODO: Cleanup the following
 181
 182                 $out->addHTML( Xml::element( 'h2',
 183                         array( 'id' => 'filelinks' ),
 184                         wfMsg( 'imagelinks' ) ) . "\n" );
 185                 $this->imageDupes();
 186                 # @todo FIXME: For some freaky reason, we can't redirect to foreign images.
 187                 # Yet we return metadata about the target. Definitely an issue in the FileRepo
 188                 $this->imageLinks();
 189
 190                 # Allow extensions to add something after the image links
 191                 $html = '';
 192                 wfRunHooks( 'ImagePageAfterImageLinks', array( $this, &$html ) );
 193                 if ( $html ) {
 194                         $out->addHTML( $html );
 195                 }
 196
 197                 if ( $showmeta ) {
 198                         $out->addHTML( Xml::element( 'h2', array( 'id' => 'metadata' ), wfMsg( 'metadata' ) ) . "\n" );
 199                         $out->addWikiText( $this->makeMetadataTable( $formattedMetadata ) );
 200                         $out->addModules( array( 'mediawiki.action.view.metadata' ) );
 201                 }
 202
 203                 // Add remote Filepage.css
 204                 if( !$this->repo->isLocal() ) {
 205                         $css = $this->repo->getDescriptionStylesheetUrl();
 206                         if ( $css ) {
 207                                 $out->addStyle( $css );
 208                         }
 209                 }
 210                 // always show the local local Filepage.css, bug 29277
 211                 $out->addModuleStyles( 'filepage' );
 212         }
 213
 214         /**
 215          * @return File
 216          */
 217         public function getDisplayedFile() {
 218                 $this->loadFile();
 219                 return $this->displayImg;
 220         }
 221
 222         /**
 223          * Create the TOC
 224          *
 225          * @param $metadata Boolean: whether or not to show the metadata link
 226          * @return String
 227          */
 228         protected function showTOC( $metadata ) {
 229                 $r = array(
 230                         '<li><a href="#file">' . wfMsgHtml( 'file-anchor-link' ) . '</a></li>',
 231                         '<li><a href="#filehistory">' . wfMsgHtml( 'filehist' ) . '</a></li>',
 232                         '<li><a href="#filelinks">' . wfMsgHtml( 'imagelinks' ) . '</a></li>',
 233                 );
 234                 if ( $metadata ) {
 235                         $r[] = '<li><a href="#metadata">' . wfMsgHtml( 'metadata' ) . '</a></li>';
 236                 }
 237
 238                 wfRunHooks( 'ImagePageShowTOC', array( $this, &$r ) );
 239
 240                 return '<ul id="filetoc">' . implode( "\n", $r ) . '</ul>';
 241         }
 242
 243         /**
 244          * Make a table with metadata to be shown in the output page.
 245          *
 246          * @todo FIXME: Bad interface, see note on MediaHandler::formatMetadata().
 247          *
 248          * @param $metadata Array: the array containing the EXIF data
 249          * @return String The metadata table. This is treated as Wikitext (!)
 250          */
 251         protected function makeMetadataTable( $metadata ) {
 252                 $r = "<div class=\"mw-imagepage-section-metadata\">";
 253                 $r .= wfMsgNoTrans( 'metadata-help' );
 254                 $r .= "<table id=\"mw_metadata\" class=\"mw_metadata\">\n";
 255                 foreach ( $metadata as $type => $stuff ) {
 256                         foreach ( $stuff as $v ) {
 257                                 # @todo FIXME: Why is this using escapeId for a class?!
 258                                 $class = Sanitizer::escapeId( $v['id'] );
 259                                 if ( $type == 'collapsed' ) {
 260                                         $class .= ' collapsable';
 261                                 }
 262                                 $r .= "<tr class=\"$class\">\n";
 263                                 $r .= "<th>{$v['name']}</th>\n";
 264                                 $r .= "<td>{$v['value']}</td>\n</tr>";
 265                         }
 266                 }
 267                 $r .= "</table>\n</div>\n";
 268                 return $r;
 269         }
 270
 271         /**
 272          * Overloading Article's getContent method.
 273          *
 274          * Omit noarticletext if sharedupload; text will be fetched from the
 275          * shared upload server if possible.
 276          * @return string
 277          */
 278         public function getContent() {
 279                 $this->loadFile();
 280                 if ( $this->mPage->getFile() && !$this->mPage->getFile()->isLocal() && 0 == $this->getID() ) {
 281                         return '';
 282                 }
 283                 return parent::getContent();
 284         }
 285
 286         protected function openShowImage() {
 287                 global $wgImageLimits, $wgEnableUploads, $wgSend404Code;
 288
 289                 $this->loadFile();
 290                 $out = $this->getContext()->getOutput();
 291                 $user = $this->getContext()->getUser();
 292                 $lang = $this->getContext()->getLanguage();
 293                 $dirmark = $lang->getDirMarkEntity();
 294                 $request = $this->getContext()->getRequest();
 295
 296                 $sizeSel = intval( $user->getOption( 'imagesize' ) );
 297                 if ( !isset( $wgImageLimits[$sizeSel] ) ) {
 298                         $sizeSel = User::getDefaultOption( 'imagesize' );
 299
 300                         // The user offset might still be incorrect, specially if
 301                         // $wgImageLimits got changed (see bug #8858).
 302                         if ( !isset( $wgImageLimits[$sizeSel] ) ) {
 303                                 // Default to the first offset in $wgImageLimits
 304                                 $sizeSel = 0;
 305                         }
 306                 }
 307                 $max = $wgImageLimits[$sizeSel];
 308                 $maxWidth = $max[0];
 309                 $maxHeight = $max[1];
 310
 311                 if ( $this->displayImg->exists() ) {
 312                         # image
 313                         $page = $request->getIntOrNull( 'page' );
 314                         if ( is_null( $page ) ) {
 315                                 $params = array();
 316                                 $page = 1;
 317                         } else {
 318                                 $params = array( 'page' => $page );
 319                         }
 320                         $width_orig = $this->displayImg->getWidth( $page );
 321                         $width = $width_orig;
 322                         $height_orig = $this->displayImg->getHeight( $page );
 323                         $height = $height_orig;
 324
 325                         $longDesc = wfMsg( 'parentheses', $this->displayImg->getLongDesc() );
 326
 327                         wfRunHooks( 'ImageOpenShowImageInlineBefore', array( &$this, &$out ) );
 328
 329                         if ( $this->displayImg->allowInlineDisplay() ) {
 330                                 # image
 331
 332                                 # "Download high res version" link below the image
 333                                 # $msgsize = wfMsgHtml( 'file-info-size', $width_orig, $height_orig, Linker::formatSize( $this->displayImg->getSize() ), $mime );
 334                                 # We'll show a thumbnail of this image
 335                                 if ( $width > $maxWidth || $height > $maxHeight ) {
 336                                         # Calculate the thumbnail size.
 337                                         # First case, the limiting factor is the width, not the height.
 338                                         if ( $width / $height >= $maxWidth / $maxHeight ) {
 339                                                 $height = round( $height * $maxWidth / $width );
 340                                                 $width = $maxWidth;
 341                                                 # Note that $height <= $maxHeight now.
 342                                         } else {
 343                                                 $newwidth = floor( $width * $maxHeight / $height );
 344                                                 $height = round( $height * $newwidth / $width );
 345                                                 $width = $newwidth;
 346                                                 # Note that $height <= $maxHeight now, but might not be identical
 347                                                 # because of rounding.
 348                                         }
 349                                         $msgbig = wfMsgHtml( 'show-big-image' );
 350                                         if ( $this->displayImg->getRepo()->canTransformVia404() ) {
 351                                                 $thumbSizes = $wgImageLimits;
 352                                         } else {
 353                                                 # Creating thumb links triggers thumbnail generation.
 354                                                 # Just generate the thumb for the current users prefs.
 355                                                 $thumbOption = $user->getOption( 'thumbsize' );
 356                                                 $thumbSizes = array( isset( $wgImageLimits[$thumbOption] )
 357                                                         ? $wgImageLimits[$thumbOption]
 358                                                         : $wgImageLimits[User::getDefaultOption( 'thumbsize' )] );
 359                                         }
 360                                         # Generate thumbnails or thumbnail links as needed...
 361                                         $otherSizes = array();
 362                                         foreach ( $thumbSizes as $size ) {
 363                                                 if ( $size[0] < $width_orig && $size[1] < $height_orig
 364                                                         && $size[0] != $width && $size[1] != $height )
 365                                                 {
 366                                                         $otherSizes[] = $this->makeSizeLink( $params, $size[0], $size[1] );
 367                                                 }
 368                                         }
 369                                         $msgsmall = wfMessage( 'show-big-image-preview' )->
 370                                                 rawParams( $this->makeSizeLink( $params, $width, $height ) )->
 371                                                 parse();
 372                                         if ( count( $otherSizes ) ) {
 373                                                 $msgsmall .= ' ' .
 374                                                 Html::rawElement( 'span', array( 'class' => 'mw-filepage-other-resolutions' ),
 375                                                         wfMessage( 'show-big-image-other' )->rawParams( $lang->pipeList( $otherSizes ) )->
 376                                                         params( count( $otherSizes ) )->parse()
 377                                                 );
 378                                         }
 379                                 } elseif ( $width == 0 && $height == 0 ){
 380                                         # Some sort of audio file that doesn't have dimensions
 381                                         # Don't output a no hi res message for such a file
 382                                         $msgsmall = '';
 383                                 } else {
 384                                         # Image is small enough to show full size on image page
 385                                         $msgsmall = wfMessage( 'file-nohires' )->parse();
 386                                 }
 387
 388                                 $params['width'] = $width;
 389                                 $params['height'] = $height;
 390                                 $thumbnail = $this->displayImg->transform( $params );
 391
 392                                 $showLink = true;
 393                                 $anchorclose = Html::rawElement( 'div', array( 'class' => 'mw-filepage-resolutioninfo' ), $msgsmall );
 394
 395                                 $isMulti = $this->displayImg->isMultipage() && $this->displayImg->pageCount() > 1;
 396                                 if ( $isMulti ) {
 397                                         $out->addHTML( '<table class="multipageimage"><tr><td>' );
 398                                 }
 399
 400                                 if ( $thumbnail ) {
 401                                         $options = array(
 402                                                 'alt' => $this->displayImg->getTitle()->getPrefixedText(),
 403                                                 'file-link' => true,
 404                                         );
 405                                         $out->addHTML( '<div class="fullImageLink" id="file">' .
 406                                                 $thumbnail->toHtml( $options ) .
 407                                                 $anchorclose . "</div>\n" );
 408                                 }
 409
 410                                 if ( $isMulti ) {
 411                                         $count = $this->displayImg->pageCount();
 412
 413                                         if ( $page > 1 ) {
 414                                                 $label = $out->parse( wfMsg( 'imgmultipageprev' ), false );
 415                                                 $link = Linker::link(
 416                                                         $this->getTitle(),
 417                                                         $label,
 418                                                         array(),
 419                                                         array( 'page' => $page - 1 ),
 420                                                         array( 'known', 'noclasses' )
 421                                                 );
 422                                                 $thumb1 = Linker::makeThumbLinkObj( $this->getTitle(), $this->displayImg, $link, $label, 'none',
 423                                                         array( 'page' => $page - 1 ) );
 424                                         } else {
 425                                                 $thumb1 = '';
 426                                         }
 427
 428                                         if ( $page < $count ) {
 429                                                 $label = wfMsg( 'imgmultipagenext' );
 430                                                 $link = Linker::link(
 431                                                         $this->getTitle(),
 432                                                         $label,
 433                                                         array(),
 434                                                         array( 'page' => $page + 1 ),
 435                                                         array( 'known', 'noclasses' )
 436                                                 );
 437                                                 $thumb2 = Linker::makeThumbLinkObj( $this->getTitle(), $this->displayImg, $link, $label, 'none',
 438                                                         array( 'page' => $page + 1 ) );
 439                                         } else {
 440                                                 $thumb2 = '';
 441                                         }
 442
 443                                         global $wgScript;
 444
 445                                         $formParams = array(
 446                                                 'name' => 'pageselector',
 447                                                 'action' => $wgScript,
 448                                                 'onchange' => 'document.pageselector.submit();',
 449                                         );
 450                                         $options = array();
 451                                         for ( $i = 1; $i <= $count; $i++ ) {
 452                                                 $options[] = Xml::option( $lang->formatNum( $i ), $i, $i == $page );
 453                                         }
 454                                         $select = Xml::tags( 'select',
 455                                                 array( 'id' => 'pageselector', 'name' => 'page' ),
 456                                                 implode( "\n", $options ) );
 457
 458                                         $out->addHTML(
 459                                                 '</td><td><div class="multipageimagenavbox">' .
 460                                                 Xml::openElement( 'form', $formParams ) .
 461                                                 Html::hidden( 'title', $this->getTitle()->getPrefixedDBkey() ) .
 462                                                 wfMsgExt( 'imgmultigoto', array( 'parseinline', 'replaceafter' ), $select ) .
 463                                                 Xml::submitButton( wfMsg( 'imgmultigo' ) ) .
 464                                                 Xml::closeElement( 'form' ) .
 465                                                 "<hr />$thumb1\n$thumb2<br style=\"clear: both\" /></div></td></tr></table>"
 466                                         );
 467                                 }
 468                         } else {
 469                                 # if direct link is allowed but it's not a renderable image, show an icon.
 470                                 if ( $this->displayImg->isSafeFile() ) {
 471                                         $icon = $this->displayImg->iconThumb();
 472
 473                                         $out->addHTML( '<div class="fullImageLink" id="file">' .
 474                                                 $icon->toHtml( array( 'file-link' => true ) ) .
 475                                                 "</div>\n" );
 476                                 }
 477
 478                                 $showLink = true;
 479                         }
 480
 481                         if ( $showLink ) {
 482                                 $filename = wfEscapeWikiText( $this->displayImg->getName() );
 483                                 $linktext = $filename;
 484                                 if ( isset( $msgbig ) ) {
 485                                         $linktext = wfEscapeWikiText( $msgbig );
 486                                 }
 487                                 $medialink = "[[Media:$filename|$linktext]]";
 488
 489                                 if ( !$this->displayImg->isSafeFile() ) {
 490                                         $warning = wfMsgNoTrans( 'mediawarning' );
 491                                         // dirmark is needed here to separate the file name, which
 492                                         // most likely ends in Latin characters, from the description,
 493                                         // which may begin with the file type. In RTL environment
 494                                         // this will get messy.
 495                                         // The dirmark, however, must not be immediately adjacent
 496                                         // to the filename, because it can get copied with it.
 497                                         // See bug 25277.
 498                                         $out->addWikiText( <<<EOT
 499 <div class="fullMedia"><span class="dangerousLink">{$medialink}</span> $dirmark<span class="fileInfo">$longDesc</span></div>
 500 <div class="mediaWarning">$warning</div>
 501 EOT
 502                                                 );
 503                                 } else {
 504                                         $out->addWikiText( <<<EOT
 505 <div class="fullMedia">{$medialink} {$dirmark}<span class="fileInfo">$longDesc</span>
 506 </div>
 507 EOT
 508                                         );
 509                                 }
 510                         }
 511
 512                         if ( !$this->displayImg->isLocal() ) {
 513                                 $this->printSharedImageText();
 514                         }
 515                 } else {
 516                         # Image does not exist
 517                         if ( !$this->getID() ) {
 518                                 # No article exists either
 519                                 # Show deletion log to be consistent with normal articles
 520                                 LogEventsList::showLogExtract(
 521                                         $out,
 522                                         array( 'delete', 'move' ),
 523                                         $this->getTitle()->getPrefixedText(),
 524                                         '',
 525                                         array(  'lim' => 10,
 526                                                 'conds' => array( "log_action != 'revision'" ),
 527                                                 'showIfEmpty' => false,
 528                                                 'msgKey' => array( 'moveddeleted-notice' )
 529                                         )
 530                                 );
 531                         }
 532
 533                         if ( $wgEnableUploads && $user->isAllowed( 'upload' ) ) {
 534                                 // Only show an upload link if the user can upload
 535                                 $uploadTitle = SpecialPage::getTitleFor( 'Upload' );
 536                                 $nofile = array(
 537                                         'filepage-nofile-link',
 538                                         $uploadTitle->getFullURL( array( 'wpDestFile' => $this->mPage->getFile()->getName() ) )
 539                                 );
 540                         } else {
 541                                 $nofile = 'filepage-nofile';
 542                         }
 543                         // Note, if there is an image description page, but
 544                         // no image, then this setRobotPolicy is overriden
 545                         // by Article::View().
 546                         $out->setRobotPolicy( 'noindex,nofollow' );
 547                         $out->wrapWikiMsg( "<div id='mw-imagepage-nofile' class='plainlinks'>\n$1\n</div>", $nofile );
 548                         if ( !$this->getID() && $wgSend404Code ) {
 549                                 // If there is no image, no shared image, and no description page,
 550                                 // output a 404, to be consistent with articles.
 551                                 $request->response()->header( 'HTTP/1.1 404 Not Found' );
 552                         }
 553                 }
 554                 $out->setFileVersion( $this->displayImg );
 555         }
 556
 557         /**
 558          * Creates an thumbnail of specified size and returns an HTML link to it
 559          * @param $params array Scaler parameters
 560          * @param $width int
 561          * @param $height int
 562          * @return string
 563          */
 564         private function makeSizeLink( $params, $width, $height ) {
 565                 $params['width'] = $width;
 566                 $params['height'] = $height;
 567                 $thumbnail = $this->displayImg->transform( $params );
 568                 if ( $thumbnail && !$thumbnail->isError() ) {
 569                         return Html::rawElement( 'a', array(
 570                                 'href' => $thumbnail->getUrl(),
 571                                 'class' => 'mw-thumbnail-link'
 572                                 ), wfMessage( 'show-big-image-size' )->numParams(
 573                                         $thumbnail->getWidth(), $thumbnail->getHeight()
 574                                 )->parse() );
 575                 } else {
 576                         return '';
 577                 }
 578         }
 579
 580         /**
 581          * Show a notice that the file is from a shared repository
 582          */
 583         protected function printSharedImageText() {
 584                 $out = $this->getContext()->getOutput();
 585                 $this->loadFile();
 586
 587                 $descUrl = $this->mPage->getFile()->getDescriptionUrl();
 588                 $descText = $this->mPage->getFile()->getDescriptionText();
 589
 590                 /* Add canonical to head if there is no local page for this shared file */
 591                 if( $descUrl && $this->mPage->getID() == 0 ) {
 592                         $out->addLink( array( 'rel' => 'canonical', 'href' => $descUrl ) );
 593                 }
 594
 595                 $wrap = "<div class=\"sharedUploadNotice\">\n$1\n</div>\n";
 596                 $repo = $this->mPage->getFile()->getRepo()->getDisplayName();
 597
 598                 if ( $descUrl && $descText && wfMsgNoTrans( 'sharedupload-desc-here' ) !== '-'  ) {
 599                         $out->wrapWikiMsg( $wrap, array( 'sharedupload-desc-here', $repo, $descUrl ) );
 600                 } elseif ( $descUrl && wfMsgNoTrans( 'sharedupload-desc-there' ) !== '-' ) {
 601                         $out->wrapWikiMsg( $wrap, array( 'sharedupload-desc-there', $repo, $descUrl ) );
 602                 } else {
 603                         $out->wrapWikiMsg( $wrap, array( 'sharedupload', $repo ), ''/*BACKCOMPAT*/ );
 604                 }
 605
 606                 if ( $descText ) {
 607                         $this->mExtraDescription = $descText;
 608                 }
 609         }
 610
 611         public function getUploadUrl() {
 612                 $this->loadFile();
 613                 $uploadTitle = SpecialPage::getTitleFor( 'Upload' );
 614                 return $uploadTitle->getFullURL( array(
 615                         'wpDestFile' => $this->mPage->getFile()->getName(),
 616                         'wpForReUpload' => 1
 617                  ) );
 618         }
 619
 620         /**
 621          * Print out the various links at the bottom of the image page, e.g. reupload,
 622          * external editing (and instructions link) etc.
 623          */
 624         protected function uploadLinksBox() {
 625                 global $wgEnableUploads, $wgUseExternalEditor;
 626
 627                 if ( !$wgEnableUploads ) {
 628                         return;
 629                 }
 630
 631                 $this->loadFile();
 632                 if ( !$this->mPage->getFile()->isLocal() ) {
 633                         return;
 634                 }
 635
 636                 $out = $this->getContext()->getOutput();
 637                 $out->addHTML( "<br /><ul>\n" );
 638
 639                 # "Upload a new version of this file" link
 640                 if ( UploadBase::userCanReUpload( $this->getContext()->getUser(), $this->mPage->getFile()->name ) ) {
 641                         $ulink = Linker::makeExternalLink( $this->getUploadUrl(), wfMsg( 'uploadnewversion-linktext' ) );
 642                         $out->addHTML( "<li id=\"mw-imagepage-reupload-link\"><div class=\"plainlinks\">{$ulink}</div></li>\n" );
 643                 }
 644
 645                 # External editing link
 646                 if ( $wgUseExternalEditor ) {
 647                         $elink = Linker::link(
 648                                 $this->getTitle(),
 649                                 wfMsgHtml( 'edit-externally' ),
 650                                 array(),
 651                                 array(
 652                                         'action' => 'edit',
 653                                         'externaledit' => 'true',
 654                                         'mode' => 'file'
 655                                 ),
 656                                 array( 'known', 'noclasses' )
 657                         );
 658                         $out->addHTML(
 659                                 '<li id="mw-imagepage-edit-external">' . $elink . ' <small>' .
 660                                 wfMsgExt( 'edit-externally-help', array( 'parseinline' ) ) .
 661                                 "</small></li>\n"
 662                         );
 663                 }
 664
 665                 $out->addHTML( "</ul>\n" );
 666         }
 667
 668         protected function closeShowImage() { } # For overloading
 669
 670         /**
 671          * If the page we've just displayed is in the "Image" namespace,
 672          * we follow it with an upload history of the image and its usage.
 673          */
 674         protected function imageHistory() {
 675                 $this->loadFile();
 676                 $out = $this->getContext()->getOutput();
 677                 $pager = new ImageHistoryPseudoPager( $this );
 678                 $out->addHTML( $pager->getBody() );
 679                 $out->preventClickjacking( $pager->getPreventClickjacking() );
 680
 681                 $this->mPage->getFile()->resetHistory(); // free db resources
 682
 683                 # Exist check because we don't want to show this on pages where an image
 684                 # doesn't exist along with the noimage message, that would suck. -ævar
 685                 if ( $this->mPage->getFile()->exists() ) {
 686                         $this->uploadLinksBox();
 687                 }
 688         }
 689
 690         /**
 691          * @param $target
 692          * @param $limit
 693          * @return ResultWrapper
 694          */
 695         protected function queryImageLinks( $target, $limit ) {
 696                 $dbr = wfGetDB( DB_SLAVE );
 697
 698                 return $dbr->select(
 699                         array( 'imagelinks', 'page' ),
 700                         array( 'page_namespace', 'page_title', 'page_is_redirect', 'il_to' ),
 701                         array( 'il_to' => $target, 'il_from = page_id' ),
 702                         __METHOD__,
 703                         array( 'LIMIT' => $limit + 1, 'ORDER BY' => 'il_from', )
 704                 );
 705         }
 706
 707         protected function imageLinks() {
 708                 $limit = 100;
 709
 710                 $out = $this->getContext()->getOutput();
 711                 $res = $this->queryImageLinks( $this->getTitle()->getDbKey(), $limit + 1);
 712                 $rows = array();
 713                 $redirects = array();
 714                 foreach ( $res as $row ) {
 715                         if ( $row->page_is_redirect ) {
 716                                 $redirects[$row->page_title] = array();
 717                         }
 718                         $rows[] = $row;
 719                 }
 720                 $count = count( $rows );
 721
 722                 $hasMore = $count > $limit;
 723                 if ( !$hasMore && count( $redirects ) ) {
 724                         $res = $this->queryImageLinks( array_keys( $redirects ),
 725                                 $limit - count( $rows ) + 1 );
 726                         foreach ( $res as $row ) {
 727                                 $redirects[$row->il_to][] = $row;
 728                                 $count++;
 729                         }
 730                         $hasMore = ( $res->numRows() + count( $rows ) ) > $limit;
 731                 }
 732
 733                 if ( $count == 0 ) {
 734                         $out->wrapWikiMsg(
 735                                 Html::rawElement( 'div',
 736                                         array( 'id' => 'mw-imagepage-nolinkstoimage' ), "\n$1\n" ),
 737                                 'nolinkstoimage'
 738                         );
 739                         return;
 740                 }
 741
 742                 $out->addHTML( "<div id='mw-imagepage-section-linkstoimage'>\n" );
 743                 if ( !$hasMore ) {
 744                         $out->addWikiMsg( 'linkstoimage', $count );
 745                 } else {
 746                         // More links than the limit. Add a link to [[Special:Whatlinkshere]]
 747                         $out->addWikiMsg( 'linkstoimage-more',
 748                                 $this->getContext()->getLanguage()->formatNum( $limit ),
 749                                 $this->getTitle()->getPrefixedDBkey()
 750                         );
 751                 }
 752
 753                 $out->addHTML(
 754                         Html::openElement( 'ul',
 755                                 array( 'class' => 'mw-imagepage-linkstoimage' ) ) . "\n"
 756                 );
 757                 $count = 0;
 758
 759                 // Sort the list by namespace:title
 760                 usort( $rows, array( $this, 'compare' ) );
 761
 762                 // Create links for every element
 763                 $currentCount = 0;
 764                 foreach( $rows as $element ) {
 765                         $currentCount++;
 766                         if ( $currentCount > $limit ) {
 767                                 break;
 768                         }
 769
 770                         $link = Linker::linkKnown( Title::makeTitle( $element->page_namespace, $element->page_title ) );
 771                         if ( !isset( $redirects[$element->page_title] ) ) {
 772                                 $liContents = $link;
 773                         } else {
 774                                 $ul = "<ul class='mw-imagepage-redirectstofile'>\n";
 775                                 foreach ( $redirects[$element->page_title] as $row ) {
 776                                         $currentCount++;
 777                                         if ( $currentCount > $limit ) {
 778                                                 break;
 779                                         }
 780
 781                                         $link2 = Linker::linkKnown( Title::makeTitle( $row->page_namespace, $row->page_title ) );
 782                                         $ul .= Html::rawElement(
 783                                                 'li',
 784                                                 array( 'id' => 'mw-imagepage-linkstoimage-ns' . $element->page_namespace ),
 785                                                 $link2
 786                                                 ) . "\n";
 787                                 }
 788                                 $ul .= '</ul>';
 789                                 $liContents = wfMessage( 'linkstoimage-redirect' )->rawParams(
 790                                         $link, $ul )->parse();
 791                         }
 792                         $out->addHTML( Html::rawElement(
 793                                         'li',
 794                                         array( 'id' => 'mw-imagepage-linkstoimage-ns' . $element->page_namespace ),
 795                                         $liContents
 796                                 ) . "\n"
 797                         );
 798
 799                 };
 800                 $out->addHTML( Html::closeElement( 'ul' ) . "\n" );
 801                 $res->free();
 802
 803                 // Add a links to [[Special:Whatlinkshere]]
 804                 if ( $count > $limit ) {
 805                         $out->addWikiMsg( 'morelinkstoimage', $this->getTitle()->getPrefixedDBkey() );
 806                 }
 807                 $out->addHTML( Html::closeElement( 'div' ) . "\n" );
 808         }
 809
 810         protected function imageDupes() {
 811                 $this->loadFile();
 812                 $out = $this->getContext()->getOutput();
 813
 814                 $dupes = $this->mPage->getDuplicates();
 815                 if ( count( $dupes ) == 0 ) {
 816                         return;
 817                 }
 818
 819                 $out->addHTML( "<div id='mw-imagepage-section-duplicates'>\n" );
 820                 $out->addWikiMsg( 'duplicatesoffile',
 821                         $this->getContext()->getLanguage()->formatNum( count( $dupes ) ), $this->getTitle()->getDBkey()
 822                 );
 823                 $out->addHTML( "<ul class='mw-imagepage-duplicates'>\n" );
 824
 825                 /**
 826                  * @var $file File
 827                  */
 828                 foreach ( $dupes as $file ) {
 829                         $fromSrc = '';
 830                         if ( $file->isLocal() ) {
 831                                 $link = Linker::link(
 832                                         $file->getTitle(),
 833                                         null,
 834                                         array(),
 835                                         array(),
 836                                         array( 'known', 'noclasses' )
 837                                 );
 838                         } else {
 839                                 $link = Linker::makeExternalLink( $file->getDescriptionUrl(),
 840                                         $file->getTitle()->getPrefixedText() );
 841                                 $fromSrc = wfMsg( 'shared-repo-from', $file->getRepo()->getDisplayName() );
 842                         }
 843                         $out->addHTML( "<li>{$link} {$fromSrc}</li>\n" );
 844                 }
 845                 $out->addHTML( "</ul></div>\n" );
 846         }
 847
 848         /**
 849          * Delete the file, or an earlier version of it
 850          */
 851         public function delete() {
 852                 $file = $this->mPage->getFile();
 853                 if ( !$file->exists() || !$file->isLocal() || $file->getRedirected() ) {
 854                         // Standard article deletion
 855                         parent::delete();
 856                         return;
 857                 }
 858
 859                 $deleter = new FileDeleteForm( $file );
 860                 $deleter->execute();
 861         }
 862
 863         /**
 864          * Display an error with a wikitext description
 865          *
 866          * @param $description String
 867          */
 868         function showError( $description ) {
 869                 $out = $this->getContext()->getOutput();
 870                 $out->setPageTitle( wfMessage( 'internalerror' ) );
 871                 $out->setRobotPolicy( 'noindex,nofollow' );
 872                 $out->setArticleRelated( false );
 873                 $out->enableClientCache( false );
 874                 $out->addWikiText( $description );
 875         }
 876
 877         /**
 878          * Callback for usort() to do link sorts by (namespace, title)
 879          * Function copied from Title::compare()
 880          *
 881          * @param $a object page to compare with
 882          * @param $b object page to compare with
 883          * @return Integer: result of string comparison, or namespace comparison
 884          */
 885         protected function compare( $a, $b ) {
 886                 if ( $a->page_namespace == $b->page_namespace ) {
 887                         return strcmp( $a->page_title, $b->page_title );
 888                 } else {
 889                         return $a->page_namespace - $b->page_namespace;
 890                 }
 891         }
 892 }
 893
 894 /**
 895  * Builds the image revision log shown on image pages
 896  *
 897  * @ingroup Media
 898  */
 899 class ImageHistoryList extends ContextSource {
 900
 901         /**
 902          * @var Title
 903          */
 904         protected $title;
 905
 906         /**
 907          * @var File
 908          */
 909         protected $img;
 910
 911         /**
 912          * @var ImagePage
 913          */
 914         protected $imagePage;
 915
 916         /**
 917          * @var File
 918          */
 919         protected $current;
 920
 921         protected $repo, $showThumb;
 922         protected $preventClickjacking = false;
 923
 924         /**
 925          * @param ImagePage $imagePage
 926          */
 927         public function __construct( $imagePage ) {
 928                 global $wgShowArchiveThumbnails;
 929                 $this->current = $imagePage->getFile();
 930                 $this->img = $imagePage->getDisplayedFile();
 931                 $this->title = $imagePage->getTitle();
 932                 $this->imagePage = $imagePage;
 933                 $this->showThumb = $wgShowArchiveThumbnails && $this->img->canRender();
 934                 $this->setContext( $imagePage->getContext() );
 935         }
 936
 937         /**
 938          * @return ImagePage
 939          */
 940         public function getImagePage() {
 941                 return $this->imagePage;
 942         }
 943
 944         /**
 945          * @return File
 946          */
 947         public function getFile() {
 948                 return $this->img;
 949         }
 950
 951         /**
 952          * @param $navLinks string
 953          * @return string
 954          */
 955         public function beginImageHistoryList( $navLinks = '' ) {
 956                 return Xml::element( 'h2', array( 'id' => 'filehistory' ), wfMsg( 'filehist' ) ) . "\n"
 957                         . "<div id=\"mw-imagepage-section-filehistory\">\n"
 958                         . $this->getOutput()->parse( wfMsgNoTrans( 'filehist-help' ) )
 959                         . $navLinks . "\n"
 960                         . Xml::openElement( 'table', array( 'class' => 'wikitable filehistory' ) ) . "\n"
 961                         . '<tr><td></td>'
 962                         . ( $this->current->isLocal() && ( $this->getUser()->isAllowedAny( 'delete', 'deletedhistory' ) ) ? '<td></td>' : '' )
 963                         . '<th>' . wfMsgHtml( 'filehist-datetime' ) . '</th>'
 964                         . ( $this->showThumb ? '<th>' . wfMsgHtml( 'filehist-thumb' ) . '</th>' : '' )
 965                         . '<th>' . wfMsgHtml( 'filehist-dimensions' ) . '</th>'
 966                         . '<th>' . wfMsgHtml( 'filehist-user' ) . '</th>'
 967                         . '<th>' . wfMsgHtml( 'filehist-comment' ) . '</th>'
 968                         . "</tr>\n";
 969         }
 970
 971         /**
 972          * @param $navLinks string
 973          * @return string
 974          */
 975         public function endImageHistoryList( $navLinks = '' ) {
 976                 return "</table>\n$navLinks\n</div>\n";
 977         }
 978
 979         /**
 980          * @param $iscur
 981          * @param $file File
 982          * @return string
 983          */
 984         public function imageHistoryLine( $iscur, $file ) {
 985                 global $wgContLang;
 986
 987                 $user = $this->getUser();
 988                 $lang = $this->getLanguage();
 989                 $timestamp = wfTimestamp( TS_MW, $file->getTimestamp() );
 990                 $img = $iscur ? $file->getName() : $file->getArchiveName();
 991                 $userId = $file->getUser( 'id' );
 992                 $userText = $file->getUser( 'text' );
 993                 $description = $file->getDescription();
 994
 995                 $local = $this->current->isLocal();
 996                 $row = $selected = '';
 997
 998                 // Deletion link
 999                 if ( $local && ( $user->isAllowedAny( 'delete', 'deletedhistory' ) ) ) {
1000                         $row .= '<td>';
1001                         # Link to remove from history
1002                         if ( $user->isAllowed( 'delete' ) ) {
1003                                 $q = array( 'action' => 'delete' );
1004                                 if ( !$iscur ) {
1005                                         $q['oldimage'] = $img;
1006                                 }
1007                                 $row .= Linker::link(
1008                                         $this->title,
1009                                         wfMsgHtml( $iscur ? 'filehist-deleteall' : 'filehist-deleteone' ),
1010                                         array(), $q, array( 'known' )
1011                                 );
1012                         }
1013                         # Link to hide content. Don't show useless link to people who cannot hide revisions.
1014                         $canHide = $user->isAllowed( 'deleterevision' );
1015                         if ( $canHide || ( $user->isAllowed( 'deletedhistory' ) && $file->getVisibility() ) ) {
1016                                 if ( $user->isAllowed( 'delete' ) ) {
1017                                         $row .= '<br />';
1018                                 }
1019                                 // If file is top revision or locked from this user, don't link
1020                                 if ( $iscur || !$file->userCan( File::DELETED_RESTRICTED ) ) {
1021                                         $del = Linker::revDeleteLinkDisabled( $canHide );
1022                                 } else {
1023                                         list( $ts, ) = explode( '!', $img, 2 );
1024                                         $query = array(
1025                                                 'type'   => 'oldimage',
1026                                                 'target' => $this->title->getPrefixedText(),
1027                                                 'ids'    => $ts,
1028                                         );
1029                                         $del = Linker::revDeleteLink( $query,
1030                                                 $file->isDeleted( File::DELETED_RESTRICTED ), $canHide );
1031                                 }
1032                                 $row .= $del;
1033                         }
1034                         $row .= '</td>';
1035                 }
1036
1037                 // Reversion link/current indicator
1038                 $row .= '<td>';
1039                 if ( $iscur ) {
1040                         $row .= wfMsgHtml( 'filehist-current' );
1041                 } elseif ( $local && $this->title->quickUserCan( 'edit' )
1042                         && $this->title->quickUserCan( 'upload' )
1043                 ) {
1044                         if ( $file->isDeleted( File::DELETED_FILE ) ) {
1045                                 $row .= wfMsgHtml( 'filehist-revert' );
1046                         } else {
1047                                 $row .= Linker::link(
1048                                         $this->title,
1049                                         wfMsgHtml( 'filehist-revert' ),
1050                                         array(),
1051                                         array(
1052                                                 'action' => 'revert',
1053                                                 'oldimage' => $img,
1054                                                 'wpEditToken' => $user->getEditToken( $img )
1055                                         ),
1056                                         array( 'known', 'noclasses' )
1057                                 );
1058                         }
1059                 }
1060                 $row .= '</td>';
1061
1062                 // Date/time and image link
1063                 if ( $file->getTimestamp() === $this->img->getTimestamp() ) {
1064                         $selected = "class='filehistory-selected'";
1065                 }
1066                 $row .= "<td $selected style='white-space: nowrap;'>";
1067                 if ( !$file->userCan( File::DELETED_FILE ) ) {
1068                         # Don't link to unviewable files
1069                         $row .= '<span class="history-deleted">' . $lang->timeanddate( $timestamp, true ) . '</span>';
1070                 } elseif ( $file->isDeleted( File::DELETED_FILE ) ) {
1071                         if ( $local ) {
1072                                 $this->preventClickjacking();
1073                                 $revdel = SpecialPage::getTitleFor( 'Revisiondelete' );
1074                                 # Make a link to review the image
1075                                 $url = Linker::link(
1076                                         $revdel,
1077                                         $lang->timeanddate( $timestamp, true ),
1078                                         array(),
1079                                         array(
1080                                                 'target' => $this->title->getPrefixedText(),
1081                                                 'file' => $img,
1082                                                 'token' => $user->getEditToken( $img )
1083                                         ),
1084                                         array( 'known', 'noclasses' )
1085                                 );
1086                         } else {
1087                                 $url = $lang->timeanddate( $timestamp, true );
1088                         }
1089                         $row .= '<span class="history-deleted">' . $url . '</span>';
1090                 } else {
1091                         $url = $iscur ? $this->current->getUrl() : $this->current->getArchiveUrl( $img );
1092                         $row .= Xml::element( 'a', array( 'href' => $url ), $lang->timeanddate( $timestamp, true ) );
1093                 }
1094                 $row .= "</td>";
1095
1096                 // Thumbnail
1097                 if ( $this->showThumb ) {
1098                         $row .= '<td>' . $this->getThumbForLine( $file ) . '</td>';
1099                 }
1100
1101                 // Image dimensions + size
1102                 $row .= '<td>';
1103                 $row .= htmlspecialchars( $file->getDimensionsString() );
1104                 $row .= $this->getContext()->msg( 'word-separator' )->plain();
1105                 $row .= '<span style="white-space: nowrap;">';
1106                 $row .= $this->getContext()->msg( 'parentheses' )->rawParams( Linker::formatSize( $file->getSize() ) )->plain();
1107                 $row .= '</span>';
1108                 $row .= '</td>';
1109
1110                 // Uploading user
1111                 $row .= '<td>';
1112                 // Hide deleted usernames
1113                 if ( $file->isDeleted( File::DELETED_USER ) ) {
1114                         $row .= '<span class="history-deleted">' . wfMsgHtml( 'rev-deleted-user' ) . '</span>';
1115                 } else {
1116                         if ( $local ) {
1117                                 $row .= Linker::userLink( $userId, $userText ) . ' <span style="white-space: nowrap;">' .
1118                                 Linker::userToolLinks( $userId, $userText ) . '</span>';
1119                         } else {
1120                                 $row .= htmlspecialchars( $userText );
1121                         }
1122                 }
1123                 $row .= '</td>';
1124
1125                 // Don't show deleted descriptions
1126                 if ( $file->isDeleted( File::DELETED_COMMENT ) ) {
1127                         $row .= '<td><span class="history-deleted">' . wfMsgHtml( 'rev-deleted-comment' ) . '</span></td>';
1128                 } else {
1129                         $row .= '<td dir="' . $wgContLang->getDir() . '">' . Linker::formatComment( $description, $this->title ) . '</td>';
1130                 }
1131
1132                 $rowClass = null;
1133                 wfRunHooks( 'ImagePageFileHistoryLine', array( $this, $file, &$row, &$rowClass ) );
1134                 $classAttr = $rowClass ? " class='$rowClass'" : '';
1135
1136                 return "<tr{$classAttr}>{$row}</tr>\n";
1137         }
1138
1139         /**
1140          * @param $file File
1141          * @return string
1142          */
1143         protected function getThumbForLine( $file ) {
1144                 $lang = $this->getLanguage();
1145                 if ( $file->allowInlineDisplay() && $file->userCan( File::DELETED_FILE ) && !$file->isDeleted( File::DELETED_FILE ) ) {
1146                         $params = array(
1147                                 'width' => '120',
1148                                 'height' => '120',
1149                         );
1150                         $timestamp = wfTimestamp( TS_MW, $file->getTimestamp() );
1151
1152                         $thumbnail = $file->transform( $params );
1153                         $options = array(
1154                                 'alt' => wfMsg( 'filehist-thumbtext',
1155                                         $lang->timeanddate( $timestamp, true ),
1156                                         $lang->date( $timestamp, true ),
1157                                         $lang->time( $timestamp, true ) ),
1158                                 'file-link' => true,
1159                         );
1160
1161                         if ( !$thumbnail ) {
1162                                 return wfMsgHtml( 'filehist-nothumb' );
1163                         }
1164
1165                         return $thumbnail->toHtml( $options );
1166                 } else {
1167                         return wfMsgHtml( 'filehist-nothumb' );
1168                 }
1169         }
1170
1171         /**
1172          * @param $enable bool
1173          */
1174         protected function preventClickjacking( $enable = true ) {
1175                 $this->preventClickjacking = $enable;
1176         }
1177
1178         /**
1179          * @return bool
1180          */
1181         public function getPreventClickjacking() {
1182                 return $this->preventClickjacking;
1183         }
1184 }
1185
1186 class ImageHistoryPseudoPager extends ReverseChronologicalPager {
1187         protected $preventClickjacking = false;
1188
1189         /**
1190          * @var File
1191          */
1192         protected $mImg;
1193
1194         /**
1195          * @var Title
1196          */
1197         protected $mTitle;
1198
1199         /**
1200          * @param ImagePage $imagePage
1201          */
1202         function __construct( $imagePage ) {
1203                 parent::__construct();
1204                 $this->mImagePage = $imagePage;
1205                 $this->mTitle = clone ( $imagePage->getTitle() );
1206                 $this->mTitle->setFragment( '#filehistory' );
1207                 $this->mImg = null;
1208                 $this->mHist = array();
1209                 $this->mRange = array( 0, 0 ); // display range
1210         }
1211
1212         /**
1213          * @return Title
1214          */
1215         function getTitle() {
1216                 return $this->mTitle;
1217         }
1218
1219         function getQueryInfo() {
1220                 return false;
1221         }
1222
1223         /**
1224          * @return string
1225          */
1226         function getIndexField() {
1227                 return '';
1228         }
1229
1230         /**
1231          * @param $row object
1232          * @return string
1233          */
1234         function formatRow( $row ) {
1235                 return '';
1236         }
1237
1238         /**
1239          * @return string
1240          */
1241         function getBody() {
1242                 $s = '';
1243                 $this->doQuery();
1244                 if ( count( $this->mHist ) ) {
1245                         $list = new ImageHistoryList( $this->mImagePage );
1246                         # Generate prev/next links
1247                         $navLink = $this->getNavigationBar();
1248                         $s = $list->beginImageHistoryList( $navLink );
1249                         // Skip rows there just for paging links
1250                         for ( $i = $this->mRange[0]; $i <= $this->mRange[1]; $i++ ) {
1251                                 $file = $this->mHist[$i];
1252                                 $s .= $list->imageHistoryLine( !$file->isOld(), $file );
1253                         }
1254                         $s .= $list->endImageHistoryList( $navLink );
1255
1256                         if ( $list->getPreventClickjacking() ) {
1257                                 $this->preventClickjacking();
1258                         }
1259                 }
1260                 return $s;
1261         }
1262
1263         function doQuery() {
1264                 if ( $this->mQueryDone ) {
1265                         return;
1266                 }
1267                 $this->mImg = $this->mImagePage->getFile(); // ensure loading
1268                 if ( !$this->mImg->exists() ) {
1269                         return;
1270                 }
1271                 $queryLimit = $this->mLimit + 1; // limit plus extra row
1272                 if ( $this->mIsBackwards ) {
1273                         // Fetch the file history
1274                         $this->mHist = $this->mImg->getHistory( $queryLimit, null, $this->mOffset, false );
1275                         // The current rev may not meet the offset/limit
1276                         $numRows = count( $this->mHist );
1277                         if ( $numRows <= $this->mLimit && $this->mImg->getTimestamp() > $this->mOffset ) {
1278                                 $this->mHist = array_merge( array( $this->mImg ), $this->mHist );
1279                         }
1280                 } else {
1281                         // The current rev may not meet the offset
1282                         if ( !$this->mOffset || $this->mImg->getTimestamp() < $this->mOffset ) {
1283                                 $this->mHist[] = $this->mImg;
1284                         }
1285                         // Old image versions (fetch extra row for nav links)
1286                         $oiLimit = count( $this->mHist ) ? $this->mLimit : $this->mLimit + 1;
1287                         // Fetch the file history
1288                         $this->mHist = array_merge( $this->mHist,
1289                                 $this->mImg->getHistory( $oiLimit, $this->mOffset, null, false ) );
1290                 }
1291                 $numRows = count( $this->mHist ); // Total number of query results
1292                 if ( $numRows ) {
1293                         # Index value of top item in the list
1294                         $firstIndex = $this->mIsBackwards ?
1295                                 $this->mHist[$numRows - 1]->getTimestamp() : $this->mHist[0]->getTimestamp();
1296                         # Discard the extra result row if there is one
1297                         if ( $numRows > $this->mLimit && $numRows > 1 ) {
1298                                 if ( $this->mIsBackwards ) {
1299                                         # Index value of item past the index
1300                                         $this->mPastTheEndIndex = $this->mHist[0]->getTimestamp();
1301                                         # Index value of bottom item in the list
1302                                         $lastIndex = $this->mHist[1]->getTimestamp();
1303                                         # Display range
1304                                         $this->mRange = array( 1, $numRows - 1 );
1305                                 } else {
1306                                         # Index value of item past the index
1307                                         $this->mPastTheEndIndex = $this->mHist[$numRows - 1]->getTimestamp();
1308                                         # Index value of bottom item in the list
1309                                         $lastIndex = $this->mHist[$numRows - 2]->getTimestamp();
1310                                         # Display range
1311                                         $this->mRange = array( 0, $numRows - 2 );
1312                                 }
1313                         } else {
1314                                 # Setting indexes to an empty string means that they will be
1315                                 # omitted if they would otherwise appear in URLs. It just so
1316                                 # happens that this  is the right thing to do in the standard
1317                                 # UI, in all the relevant cases.
1318                                 $this->mPastTheEndIndex = '';
1319                                 # Index value of bottom item in the list
1320                                 $lastIndex = $this->mIsBackwards ?
1321                                         $this->mHist[0]->getTimestamp() : $this->mHist[$numRows - 1]->getTimestamp();
1322                                 # Display range
1323                                 $this->mRange = array( 0, $numRows - 1 );
1324                         }
1325                 } else {
1326                         $firstIndex = '';
1327                         $lastIndex = '';
1328                         $this->mPastTheEndIndex = '';
1329                 }
1330                 if ( $this->mIsBackwards ) {
1331                         $this->mIsFirst = ( $numRows < $queryLimit );
1332                         $this->mIsLast = ( $this->mOffset == '' );
1333                         $this->mLastShown = $firstIndex;
1334                         $this->mFirstShown = $lastIndex;
1335                 } else {
1336                         $this->mIsFirst = ( $this->mOffset == '' );
1337                         $this->mIsLast = ( $numRows < $queryLimit );
1338                         $this->mLastShown = $lastIndex;
1339                         $this->mFirstShown = $firstIndex;
1340                 }
1341                 $this->mQueryDone = true;
1342         }
1343
1344         /**
1345          * @param $enable bool
1346          */
1347         protected function preventClickjacking( $enable = true ) {
1348                 $this->preventClickjacking = $enable;
1349         }
1350
1351         /**
1352          * @return bool
1353          */
1354         public function getPreventClickjacking() {
1355                 return $this->preventClickjacking;
1356         }
1357
1358 }