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