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
 161                         parent::view();
 162
 163                         $out->addHTML( Xml::closeElement( 'div' ) );
 164                 } else {
 165                         # Just need to set the right headers
 166                         $out->setArticleFlag( true );
 167                         $out->setPageTitle( $this->getTitle()->getPrefixedText() );
 168                         $this->mPage->doViewUpdates( $this->getContext()->getUser() );
 169                 }
 170
 171                 # Show shared description, if needed
 172                 if ( $this->mExtraDescription ) {
 173                         $fol = wfMessage( 'shareddescriptionfollows' );
 174                         if ( !$fol->isDisabled() ) {
 175                                 $out->addWikiText( $fol->plain() );
 176                         }
 177                         $out->addHTML( '<div id="shared-image-desc">' . $this->mExtraDescription . "</div>\n" );
 178                 }
 179
 180                 $this->closeShowImage();
 181                 $this->imageHistory();
 182                 // TODO: Cleanup the following
 183
 184                 $out->addHTML( Xml::element( 'h2',
 185                         array( 'id' => 'filelinks' ),
 186                         wfMsg( 'imagelinks' ) ) . "\n" );
 187                 $this->imageDupes();
 188                 # @todo FIXME: For some freaky reason, we can't redirect to foreign images.
 189                 # Yet we return metadata about the target. Definitely an issue in the FileRepo
 190                 $this->imageLinks();
 191
 192                 # Allow extensions to add something after the image links
 193                 $html = '';
 194                 wfRunHooks( 'ImagePageAfterImageLinks', array( $this, &$html ) );
 195                 if ( $html ) {
 196                         $out->addHTML( $html );
 197                 }
 198
 199                 if ( $showmeta ) {
 200                         $out->addHTML( Xml::element( 'h2', array( 'id' => 'metadata' ), wfMsg( 'metadata' ) ) . "\n" );
 201                         $out->addWikiText( $this->makeMetadataTable( $formattedMetadata ) );
 202                         $out->addModules( array( 'mediawiki.action.view.metadata' ) );
 203                 }
 204
 205                 // Add remote Filepage.css
 206                 if( !$this->repo->isLocal() ) {
 207                         $css = $this->repo->getDescriptionStylesheetUrl();
 208                         if ( $css ) {
 209                                 $out->addStyle( $css );
 210                         }
 211                 }
 212                 // always show the local local Filepage.css, bug 29277
 213                 $out->addModuleStyles( 'filepage' );
 214         }
 215
 216         /**
 217          * @return File
 218          */
 219         public function getDisplayedFile() {
 220                 $this->loadFile();
 221                 return $this->displayImg;
 222         }
 223
 224         /**
 225          * Create the TOC
 226          *
 227          * @param $metadata Boolean: whether or not to show the metadata link
 228          * @return String
 229          */
 230         protected function showTOC( $metadata ) {
 231                 $r = array(
 232                         '<li><a href="#file">' . wfMsgHtml( 'file-anchor-link' ) . '</a></li>',
 233                         '<li><a href="#filehistory">' . wfMsgHtml( 'filehist' ) . '</a></li>',
 234                         '<li><a href="#filelinks">' . wfMsgHtml( 'imagelinks' ) . '</a></li>',
 235                 );
 236                 if ( $metadata ) {
 237                         $r[] = '<li><a href="#metadata">' . wfMsgHtml( 'metadata' ) . '</a></li>';
 238                 }
 239
 240                 wfRunHooks( 'ImagePageShowTOC', array( $this, &$r ) );
 241
 242                 return '<ul id="filetoc">' . implode( "\n", $r ) . '</ul>';
 243         }
 244
 245         /**
 246          * Make a table with metadata to be shown in the output page.
 247          *
 248          * @todo FIXME: Bad interface, see note on MediaHandler::formatMetadata().
 249          *
 250          * @param $metadata Array: the array containing the EXIF data
 251          * @return String The metadata table. This is treated as Wikitext (!)
 252          */
 253         protected function makeMetadataTable( $metadata ) {
 254                 $r = "<div class=\"mw-imagepage-section-metadata\">";
 255                 $r .= wfMsgNoTrans( 'metadata-help' );
 256                 $r .= "<table id=\"mw_metadata\" class=\"mw_metadata\">\n";
 257                 foreach ( $metadata as $type => $stuff ) {
 258                         foreach ( $stuff as $v ) {
 259                                 # @todo FIXME: Why is this using escapeId for a class?!
 260                                 $class = Sanitizer::escapeId( $v['id'] );
 261                                 if ( $type == 'collapsed' ) {
 262                                         $class .= ' collapsable';
 263                                 }
 264                                 $r .= "<tr class=\"$class\">\n";
 265                                 $r .= "<th>{$v['name']}</th>\n";
 266                                 $r .= "<td>{$v['value']}</td>\n</tr>";
 267                         }
 268                 }
 269                 $r .= "</table>\n</div>\n";
 270                 return $r;
 271         }
 272
 273         /**
 274          * Overloading Article's getContentObject method.
 275          *
 276          * Omit noarticletext if sharedupload; text will be fetched from the
 277          * shared upload server if possible.
 278          * @return string
 279          */
 280         public function getContentObject() {
 281                 $this->loadFile();
 282                 if ( $this->mPage->getFile() && !$this->mPage->getFile()->isLocal() && 0 == $this->getID() ) {
 283                         return null;
 284                 }
 285                 return parent::getContentObject();
 286         }
 287
 288         protected function openShowImage() {
 289                 global $wgImageLimits, $wgEnableUploads, $wgSend404Code;
 290
 291                 $this->loadFile();
 292                 $out = $this->getContext()->getOutput();
 293                 $user = $this->getContext()->getUser();
 294                 $lang = $this->getContext()->getLanguage();
 295                 $dirmark = $lang->getDirMarkEntity();
 296                 $request = $this->getContext()->getRequest();
 297
 298                 $sizeSel = intval( $user->getOption( 'imagesize' ) );
 299                 if ( !isset( $wgImageLimits[$sizeSel] ) ) {
 300                         $sizeSel = User::getDefaultOption( 'imagesize' );
 301
 302                         // The user offset might still be incorrect, specially if
 303                         // $wgImageLimits got changed (see bug #8858).
 304                         if ( !isset( $wgImageLimits[$sizeSel] ) ) {
 305                                 // Default to the first offset in $wgImageLimits
 306                                 $sizeSel = 0;
 307                         }
 308                 }
 309                 $max = $wgImageLimits[$sizeSel];
 310                 $maxWidth = $max[0];
 311                 $maxHeight = $max[1];
 312
 313                 if ( $this->displayImg->exists() ) {
 314                         # image
 315                         $page = $request->getIntOrNull( 'page' );
 316                         if ( is_null( $page ) ) {
 317                                 $params = array();
 318                                 $page = 1;
 319                         } else {
 320                                 $params = array( 'page' => $page );
 321                         }
 322                         $width_orig = $this->displayImg->getWidth( $page );
 323                         $width = $width_orig;
 324                         $height_orig = $this->displayImg->getHeight( $page );
 325                         $height = $height_orig;
 326
 327                         $longDesc = wfMsg( 'parentheses', $this->displayImg->getLongDesc() );
 328
 329                         wfRunHooks( 'ImageOpenShowImageInlineBefore', array( &$this, &$out ) );
 330
 331                         if ( $this->displayImg->allowInlineDisplay() ) {
 332                                 # image
 333
 334                                 # "Download high res version" link below the image
 335                                 # $msgsize = wfMsgHtml( 'file-info-size', $width_orig, $height_orig, Linker::formatSize( $this->displayImg->getSize() ), $mime );
 336                                 # We'll show a thumbnail of this image
 337                                 if ( $width > $maxWidth || $height > $maxHeight ) {
 338                                         # Calculate the thumbnail size.
 339                                         # First case, the limiting factor is the width, not the height.
 340                                         if ( $width / $height >= $maxWidth / $maxHeight ) {
 341                                                 $height = round( $height * $maxWidth / $width );
 342                                                 $width = $maxWidth;
 343                                                 # Note that $height <= $maxHeight now.
 344                                         } else {
 345                                                 $newwidth = floor( $width * $maxHeight / $height );
 346                                                 $height = round( $height * $newwidth / $width );
 347                                                 $width = $newwidth;
 348                                                 # Note that $height <= $maxHeight now, but might not be identical
 349                                                 # because of rounding.
 350                                         }
 351                                         $msgbig = wfMsgHtml( 'show-big-image' );
 352                                         if ( $this->displayImg->getRepo()->canTransformVia404() ) {
 353                                                 $thumbSizes = $wgImageLimits;
 354                                         } else {
 355                                                 # Creating thumb links triggers thumbnail generation.
 356                                                 # Just generate the thumb for the current users prefs.
 357                                                 $thumbOption = $user->getOption( 'thumbsize' );
 358                                                 $thumbSizes = array( isset( $wgImageLimits[$thumbOption] )
 359                                                         ? $wgImageLimits[$thumbOption]
 360                                                         : $wgImageLimits[User::getDefaultOption( 'thumbsize' )] );
 361                                         }
 362                                         # Generate thumbnails or thumbnail links as needed...
 363                                         $otherSizes = array();
 364                                         foreach ( $thumbSizes as $size ) {
 365                                                 if ( $size[0] < $width_orig && $size[1] < $height_orig
 366                                                         && $size[0] != $width && $size[1] != $height )
 367                                                 {
 368                                                         $otherSizes[] = $this->makeSizeLink( $params, $size[0], $size[1] );
 369                                                 }
 370                                         }
 371                                         $msgsmall = wfMessage( 'show-big-image-preview' )->
 372                                                 rawParams( $this->makeSizeLink( $params, $width, $height ) )->
 373                                                 parse();
 374                                         if ( count( $otherSizes ) ) {
 375                                                 $msgsmall .= ' ' .
 376                                                 Html::rawElement( 'span', array( 'class' => 'mw-filepage-other-resolutions' ),
 377                                                         wfMessage( 'show-big-image-other' )->rawParams( $lang->pipeList( $otherSizes ) )->
 378                                                         params( count( $otherSizes ) )->parse()
 379                                                 );
 380                                         }
 381                                 } elseif ( $width == 0 && $height == 0 ){
 382                                         # Some sort of audio file that doesn't have dimensions
 383                                         # Don't output a no hi res message for such a file
 384                                         $msgsmall = '';
 385                                 } else {
 386                                         # Image is small enough to show full size on image page
 387                                         $msgsmall = wfMessage( 'file-nohires' )->parse();
 388                                 }
 389
 390                                 $params['width'] = $width;
 391                                 $params['height'] = $height;
 392                                 $thumbnail = $this->displayImg->transform( $params );
 393
 394                                 $showLink = true;
 395                                 $anchorclose = Html::rawElement( 'div', array( 'class' => 'mw-filepage-resolutioninfo' ), $msgsmall );
 396
 397                                 $isMulti = $this->displayImg->isMultipage() && $this->displayImg->pageCount() > 1;
 398                                 if ( $isMulti ) {
 399                                         $out->addHTML( '<table class="multipageimage"><tr><td>' );
 400                                 }
 401
 402                                 if ( $thumbnail ) {
 403                                         $options = array(
 404                                                 'alt' => $this->displayImg->getTitle()->getPrefixedText(),
 405                                                 'file-link' => true,
 406                                         );
 407                                         $out->addHTML( '<div class="fullImageLink" id="file">' .
 408                                                 $thumbnail->toHtml( $options ) .
 409                                                 $anchorclose . "</div>\n" );
 410                                 }
 411
 412                                 if ( $isMulti ) {
 413                                         $count = $this->displayImg->pageCount();
 414
 415                                         if ( $page > 1 ) {
 416                                                 $label = $out->parse( wfMsg( 'imgmultipageprev' ), false );
 417                                                 $link = Linker::linkKnown(
 418                                                         $this->getTitle(),
 419                                                         $label,
 420                                                         array(),
 421                                                         array( 'page' => $page - 1 )
 422                                                 );
 423                                                 $thumb1 = Linker::makeThumbLinkObj( $this->getTitle(), $this->displayImg, $link, $label, 'none',
 424                                                         array( 'page' => $page - 1 ) );
 425                                         } else {
 426                                                 $thumb1 = '';
 427                                         }
 428
 429                                         if ( $page < $count ) {
 430                                                 $label = wfMsg( 'imgmultipagenext' );
 431                                                 $link = Linker::linkKnown(
 432                                                         $this->getTitle(),
 433                                                         $label,
 434                                                         array(),
 435                                                         array( 'page' => $page + 1 )
 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::linkKnown(
 648                                 $this->getTitle(),
 649                                 wfMsgHtml( 'edit-externally' ),
 650                                 array(),
 651                                 array(
 652                                         'action' => 'edit',
 653                                         'externaledit' => 'true',
 654                                         'mode' => 'file'
 655                                 )
 656                         );
 657                         $out->addHTML(
 658                                 '<li id="mw-imagepage-edit-external">' . $elink . ' <small>' .
 659                                 wfMsgExt( 'edit-externally-help', array( 'parseinline' ) ) .
 660                                 "</small></li>\n"
 661                         );
 662                 }
 663
 664                 $out->addHTML( "</ul>\n" );
 665         }
 666
 667         protected function closeShowImage() { } # For overloading
 668
 669         /**
 670          * If the page we've just displayed is in the "Image" namespace,
 671          * we follow it with an upload history of the image and its usage.
 672          */
 673         protected function imageHistory() {
 674                 $this->loadFile();
 675                 $out = $this->getContext()->getOutput();
 676                 $pager = new ImageHistoryPseudoPager( $this );
 677                 $out->addHTML( $pager->getBody() );
 678                 $out->preventClickjacking( $pager->getPreventClickjacking() );
 679
 680                 $this->mPage->getFile()->resetHistory(); // free db resources
 681
 682                 # Exist check because we don't want to show this on pages where an image
 683                 # doesn't exist along with the noimage message, that would suck. -ævar
 684                 if ( $this->mPage->getFile()->exists() ) {
 685                         $this->uploadLinksBox();
 686                 }
 687         }
 688
 689         /**
 690          * @param $target
 691          * @param $limit
 692          * @return ResultWrapper
 693          */
 694         protected function queryImageLinks( $target, $limit ) {
 695                 $dbr = wfGetDB( DB_SLAVE );
 696
 697                 return $dbr->select(
 698                         array( 'imagelinks', 'page' ),
 699                         array( 'page_namespace', 'page_title', 'page_is_redirect', 'il_to' ),
 700                         array( 'il_to' => $target, 'il_from = page_id' ),
 701                         __METHOD__,
 702                         array( 'LIMIT' => $limit + 1, 'ORDER BY' => 'il_from', )
 703                 );
 704         }
 705
 706         protected function imageLinks() {
 707                 $limit = 100;
 708
 709                 $out = $this->getContext()->getOutput();
 710                 $res = $this->queryImageLinks( $this->getTitle()->getDbKey(), $limit + 1);
 711                 $rows = array();
 712                 $redirects = array();
 713                 foreach ( $res as $row ) {
 714                         if ( $row->page_is_redirect ) {
 715                                 $redirects[$row->page_title] = array();
 716                         }
 717                         $rows[] = $row;
 718                 }
 719                 $count = count( $rows );
 720
 721                 $hasMore = $count > $limit;
 722                 if ( !$hasMore && count( $redirects ) ) {
 723                         $res = $this->queryImageLinks( array_keys( $redirects ),
 724                                 $limit - count( $rows ) + 1 );
 725                         foreach ( $res as $row ) {
 726                                 $redirects[$row->il_to][] = $row;
 727                                 $count++;
 728                         }
 729                         $hasMore = ( $res->numRows() + count( $rows ) ) > $limit;
 730                 }
 731
 732                 if ( $count == 0 ) {
 733                         $out->wrapWikiMsg(
 734                                 Html::rawElement( 'div',
 735                                         array( 'id' => 'mw-imagepage-nolinkstoimage' ), "\n$1\n" ),
 736                                 'nolinkstoimage'
 737                         );
 738                         return;
 739                 }
 740
 741                 $out->addHTML( "<div id='mw-imagepage-section-linkstoimage'>\n" );
 742                 if ( !$hasMore ) {
 743                         $out->addWikiMsg( 'linkstoimage', $count );
 744                 } else {
 745                         // More links than the limit. Add a link to [[Special:Whatlinkshere]]
 746                         $out->addWikiMsg( 'linkstoimage-more',
 747                                 $this->getContext()->getLanguage()->formatNum( $limit ),
 748                                 $this->getTitle()->getPrefixedDBkey()
 749                         );
 750                 }
 751
 752                 $out->addHTML(
 753                         Html::openElement( 'ul',
 754                                 array( 'class' => 'mw-imagepage-linkstoimage' ) ) . "\n"
 755                 );
 756                 $count = 0;
 757
 758                 // Sort the list by namespace:title
 759                 usort( $rows, array( $this, 'compare' ) );
 760
 761                 // Create links for every element
 762                 $currentCount = 0;
 763                 foreach( $rows as $element ) {
 764                         $currentCount++;
 765                         if ( $currentCount > $limit ) {
 766                                 break;
 767                         }
 768
 769                         $link = Linker::linkKnown( Title::makeTitle( $element->page_namespace, $element->page_title ) );
 770                         if ( !isset( $redirects[$element->page_title] ) ) {
 771                                 $liContents = $link;
 772                         } else {
 773                                 $ul = "<ul class='mw-imagepage-redirectstofile'>\n";
 774                                 foreach ( $redirects[$element->page_title] as $row ) {
 775                                         $currentCount++;
 776                                         if ( $currentCount > $limit ) {
 777                                                 break;
 778                                         }
 779
 780                                         $link2 = Linker::linkKnown( Title::makeTitle( $row->page_namespace, $row->page_title ) );
 781                                         $ul .= Html::rawElement(
 782                                                 'li',
 783                                                 array( 'class' => 'mw-imagepage-linkstoimage-ns' . $element->page_namespace ),
 784                                                 $link2
 785                                                 ) . "\n";
 786                                 }
 787                                 $ul .= '</ul>';
 788                                 $liContents = wfMessage( 'linkstoimage-redirect' )->rawParams(
 789                                         $link, $ul )->parse();
 790                         }
 791                         $out->addHTML( Html::rawElement(
 792                                         'li',
 793                                         array( 'class' => 'mw-imagepage-linkstoimage-ns' . $element->page_namespace ),
 794                                         $liContents
 795                                 ) . "\n"
 796                         );
 797
 798                 };
 799                 $out->addHTML( Html::closeElement( 'ul' ) . "\n" );
 800                 $res->free();
 801
 802                 // Add a links to [[Special:Whatlinkshere]]
 803                 if ( $count > $limit ) {
 804                         $out->addWikiMsg( 'morelinkstoimage', $this->getTitle()->getPrefixedDBkey() );
 805                 }
 806                 $out->addHTML( Html::closeElement( 'div' ) . "\n" );
 807         }
 808
 809         protected function imageDupes() {
 810                 $this->loadFile();
 811                 $out = $this->getContext()->getOutput();
 812
 813                 $dupes = $this->mPage->getDuplicates();
 814                 if ( count( $dupes ) == 0 ) {
 815                         return;
 816                 }
 817
 818                 $out->addHTML( "<div id='mw-imagepage-section-duplicates'>\n" );
 819                 $out->addWikiMsg( 'duplicatesoffile',
 820                         $this->getContext()->getLanguage()->formatNum( count( $dupes ) ), $this->getTitle()->getDBkey()
 821                 );
 822                 $out->addHTML( "<ul class='mw-imagepage-duplicates'>\n" );
 823
 824                 /**
 825                  * @var $file File
 826                  */
 827                 foreach ( $dupes as $file ) {
 828                         $fromSrc = '';
 829                         if ( $file->isLocal() ) {
 830                                 $link = Linker::linkKnown( $file->getTitle() );
 831                         } else {
 832                                 $link = Linker::makeExternalLink( $file->getDescriptionUrl(),
 833                                         $file->getTitle()->getPrefixedText() );
 834                                 $fromSrc = wfMsg( 'shared-repo-from', $file->getRepo()->getDisplayName() );
 835                         }
 836                         $out->addHTML( "<li>{$link} {$fromSrc}</li>\n" );
 837                 }
 838                 $out->addHTML( "</ul></div>\n" );
 839         }
 840
 841         /**
 842          * Delete the file, or an earlier version of it
 843          */
 844         public function delete() {
 845                 $file = $this->mPage->getFile();
 846                 if ( !$file->exists() || !$file->isLocal() || $file->getRedirected() ) {
 847                         // Standard article deletion
 848                         parent::delete();
 849                         return;
 850                 }
 851
 852                 $deleter = new FileDeleteForm( $file );
 853                 $deleter->execute();
 854         }
 855
 856         /**
 857          * Display an error with a wikitext description
 858          *
 859          * @param $description String
 860          */
 861         function showError( $description ) {
 862                 $out = $this->getContext()->getOutput();
 863                 $out->setPageTitle( wfMessage( 'internalerror' ) );
 864                 $out->setRobotPolicy( 'noindex,nofollow' );
 865                 $out->setArticleRelated( false );
 866                 $out->enableClientCache( false );
 867                 $out->addWikiText( $description );
 868         }
 869
 870         /**
 871          * Callback for usort() to do link sorts by (namespace, title)
 872          * Function copied from Title::compare()
 873          *
 874          * @param $a object page to compare with
 875          * @param $b object page to compare with
 876          * @return Integer: result of string comparison, or namespace comparison
 877          */
 878         protected function compare( $a, $b ) {
 879                 if ( $a->page_namespace == $b->page_namespace ) {
 880                         return strcmp( $a->page_title, $b->page_title );
 881                 } else {
 882                         return $a->page_namespace - $b->page_namespace;
 883                 }
 884         }
 885 }
 886
 887 /**
 888  * Builds the image revision log shown on image pages
 889  *
 890  * @ingroup Media
 891  */
 892 class ImageHistoryList extends ContextSource {
 893
 894         /**
 895          * @var Title
 896          */
 897         protected $title;
 898
 899         /**
 900          * @var File
 901          */
 902         protected $img;
 903
 904         /**
 905          * @var ImagePage
 906          */
 907         protected $imagePage;
 908
 909         /**
 910          * @var File
 911          */
 912         protected $current;
 913
 914         protected $repo, $showThumb;
 915         protected $preventClickjacking = false;
 916
 917         /**
 918          * @param ImagePage $imagePage
 919          */
 920         public function __construct( $imagePage ) {
 921                 global $wgShowArchiveThumbnails;
 922                 $this->current = $imagePage->getFile();
 923                 $this->img = $imagePage->getDisplayedFile();
 924                 $this->title = $imagePage->getTitle();
 925                 $this->imagePage = $imagePage;
 926                 $this->showThumb = $wgShowArchiveThumbnails && $this->img->canRender();
 927                 $this->setContext( $imagePage->getContext() );
 928         }
 929
 930         /**
 931          * @return ImagePage
 932          */
 933         public function getImagePage() {
 934                 return $this->imagePage;
 935         }
 936
 937         /**
 938          * @return File
 939          */
 940         public function getFile() {
 941                 return $this->img;
 942         }
 943
 944         /**
 945          * @param $navLinks string
 946          * @return string
 947          */
 948         public function beginImageHistoryList( $navLinks = '' ) {
 949                 return Xml::element( 'h2', array( 'id' => 'filehistory' ), $this->msg( 'filehist' )->text() ) . "\n"
 950                         . "<div id=\"mw-imagepage-section-filehistory\">\n"
 951                         . $this->msg( 'filehist-help' )->parseAsBlock()
 952                         . $navLinks . "\n"
 953                         . Xml::openElement( 'table', array( 'class' => 'wikitable filehistory' ) ) . "\n"
 954                         . '<tr><td></td>'
 955                         . ( $this->current->isLocal() && ( $this->getUser()->isAllowedAny( 'delete', 'deletedhistory' ) ) ? '<td></td>' : '' )
 956                         . '<th>' . $this->msg( 'filehist-datetime' )->escaped() . '</th>'
 957                         . ( $this->showThumb ? '<th>' . $this->msg( 'filehist-thumb' )->escaped() . '</th>' : '' )
 958                         . '<th>' . $this->msg( 'filehist-dimensions' )->escaped() . '</th>'
 959                         . '<th>' . $this->msg( 'filehist-user' )->escaped() . '</th>'
 960                         . '<th>' . $this->msg( 'filehist-comment' )->escaped() . '</th>'
 961                         . "</tr>\n";
 962         }
 963
 964         /**
 965          * @param $navLinks string
 966          * @return string
 967          */
 968         public function endImageHistoryList( $navLinks = '' ) {
 969                 return "</table>\n$navLinks\n</div>\n";
 970         }
 971
 972         /**
 973          * @param $iscur
 974          * @param $file File
 975          * @return string
 976          */
 977         public function imageHistoryLine( $iscur, $file ) {
 978                 global $wgContLang;
 979
 980                 $user = $this->getUser();
 981                 $lang = $this->getLanguage();
 982                 $timestamp = wfTimestamp( TS_MW, $file->getTimestamp() );
 983                 $img = $iscur ? $file->getName() : $file->getArchiveName();
 984                 $userId = $file->getUser( 'id' );
 985                 $userText = $file->getUser( 'text' );
 986                 $description = $file->getDescription( File::FOR_THIS_USER, $user );
 987
 988                 $local = $this->current->isLocal();
 989                 $row = $selected = '';
 990
 991                 // Deletion link
 992                 if ( $local && ( $user->isAllowedAny( 'delete', 'deletedhistory' ) ) ) {
 993                         $row .= '<td>';
 994                         # Link to remove from history
 995                         if ( $user->isAllowed( 'delete' ) ) {
 996                                 $q = array( 'action' => 'delete' );
 997                                 if ( !$iscur ) {
 998                                         $q['oldimage'] = $img;
 999                                 }
1000                                 $row .= Linker::linkKnown(
1001                                         $this->title,
1002                                         $this->msg( $iscur ? 'filehist-deleteall' : 'filehist-deleteone' )->escaped(),
1003                                         array(), $q
1004                                 );
1005                         }
1006                         # Link to hide content. Don't show useless link to people who cannot hide revisions.
1007                         $canHide = $user->isAllowed( 'deleterevision' );
1008                         if ( $canHide || ( $user->isAllowed( 'deletedhistory' ) && $file->getVisibility() ) ) {
1009                                 if ( $user->isAllowed( 'delete' ) ) {
1010                                         $row .= '<br />';
1011                                 }
1012                                 // If file is top revision or locked from this user, don't link
1013                                 if ( $iscur || !$file->userCan( File::DELETED_RESTRICTED, $user ) ) {
1014                                         $del = Linker::revDeleteLinkDisabled( $canHide );
1015                                 } else {
1016                                         list( $ts, ) = explode( '!', $img, 2 );
1017                                         $query = array(
1018                                                 'type'   => 'oldimage',
1019                                                 'target' => $this->title->getPrefixedText(),
1020                                                 'ids'    => $ts,
1021                                         );
1022                                         $del = Linker::revDeleteLink( $query,
1023                                                 $file->isDeleted( File::DELETED_RESTRICTED ), $canHide );
1024                                 }
1025                                 $row .= $del;
1026                         }
1027                         $row .= '</td>';
1028                 }
1029
1030                 // Reversion link/current indicator
1031                 $row .= '<td>';
1032                 if ( $iscur ) {
1033                         $row .= $this->msg( 'filehist-current' )->escaped();
1034                 } elseif ( $local && $this->title->quickUserCan( 'edit', $user )
1035                         && $this->title->quickUserCan( 'upload', $user )
1036                 ) {
1037                         if ( $file->isDeleted( File::DELETED_FILE ) ) {
1038                                 $row .= $this->msg( 'filehist-revert' )->escaped();
1039                         } else {
1040                                 $row .= Linker::linkKnown(
1041                                         $this->title,
1042                                         $this->msg( 'filehist-revert' )->escaped(),
1043                                         array(),
1044                                         array(
1045                                                 'action' => 'revert',
1046                                                 'oldimage' => $img,
1047                                                 'wpEditToken' => $user->getEditToken( $img )
1048                                         )
1049                                 );
1050                         }
1051                 }
1052                 $row .= '</td>';
1053
1054                 // Date/time and image link
1055                 if ( $file->getTimestamp() === $this->img->getTimestamp() ) {
1056                         $selected = "class='filehistory-selected'";
1057                 }
1058                 $row .= "<td $selected style='white-space: nowrap;'>";
1059                 if ( !$file->userCan( File::DELETED_FILE, $user ) ) {
1060                         # Don't link to unviewable files
1061                         $row .= '<span class="history-deleted">' . $lang->userTimeAndDate( $timestamp, $user ) . '</span>';
1062                 } elseif ( $file->isDeleted( File::DELETED_FILE ) ) {
1063                         if ( $local ) {
1064                                 $this->preventClickjacking();
1065                                 $revdel = SpecialPage::getTitleFor( 'Revisiondelete' );
1066                                 # Make a link to review the image
1067                                 $url = Linker::linkKnown(
1068                                         $revdel,
1069                                         $lang->userTimeAndDate( $timestamp, $user ),
1070                                         array(),
1071                                         array(
1072                                                 'target' => $this->title->getPrefixedText(),
1073                                                 'file' => $img,
1074                                                 'token' => $user->getEditToken( $img )
1075                                         )
1076                                 );
1077                         } else {
1078                                 $url = $lang->userTimeAndDate( $timestamp, $user );
1079                         }
1080                         $row .= '<span class="history-deleted">' . $url . '</span>';
1081                 } else {
1082                         $url = $iscur ? $this->current->getUrl() : $this->current->getArchiveUrl( $img );
1083                         $row .= Xml::element( 'a', array( 'href' => $url ), $lang->userTimeAndDate( $timestamp, $user ) );
1084                 }
1085                 $row .= "</td>";
1086
1087                 // Thumbnail
1088                 if ( $this->showThumb ) {
1089                         $row .= '<td>' . $this->getThumbForLine( $file ) . '</td>';
1090                 }
1091
1092                 // Image dimensions + size
1093                 $row .= '<td>';
1094                 $row .= htmlspecialchars( $file->getDimensionsString() );
1095                 $row .= $this->msg( 'word-separator' )->plain();
1096                 $row .= '<span style="white-space: nowrap;">';
1097                 $row .= $this->msg( 'parentheses' )->rawParams( Linker::formatSize( $file->getSize() ) )->plain();
1098                 $row .= '</span>';
1099                 $row .= '</td>';
1100
1101                 // Uploading user
1102                 $row .= '<td>';
1103                 // Hide deleted usernames
1104                 if ( $file->isDeleted( File::DELETED_USER ) ) {
1105                         $row .= '<span class="history-deleted">' . $this->msg( 'rev-deleted-user' )->escaped() . '</span>';
1106                 } else {
1107                         if ( $local ) {
1108                                 $row .= Linker::userLink( $userId, $userText );
1109                                 $row .= $this->msg( 'word-separator' )->plain();
1110                                 $row .= '<span style="white-space: nowrap;">';
1111                                 $row .= Linker::userToolLinks( $userId, $userText );
1112                                 $row .= '</span>';
1113                         } else {
1114                                 $row .= htmlspecialchars( $userText );
1115                         }
1116                 }
1117                 $row .= '</td>';
1118
1119                 // Don't show deleted descriptions
1120                 if ( $file->isDeleted( File::DELETED_COMMENT ) ) {
1121                         $row .= '<td><span class="history-deleted">' . $this->msg( 'rev-deleted-comment' )->escaped() . '</span></td>';
1122                 } else {
1123                         $row .= '<td dir="' . $wgContLang->getDir() . '">' . Linker::formatComment( $description, $this->title ) . '</td>';
1124                 }
1125
1126                 $rowClass = null;
1127                 wfRunHooks( 'ImagePageFileHistoryLine', array( $this, $file, &$row, &$rowClass ) );
1128                 $classAttr = $rowClass ? " class='$rowClass'" : '';
1129
1130                 return "<tr{$classAttr}>{$row}</tr>\n";
1131         }
1132
1133         /**
1134          * @param $file File
1135          * @return string
1136          */
1137         protected function getThumbForLine( $file ) {
1138                 $lang = $this->getLanguage();
1139                 $user = $this->getUser();
1140                 if ( $file->allowInlineDisplay() && $file->userCan( File::DELETED_FILE,$user )
1141                         && !$file->isDeleted( File::DELETED_FILE ) )
1142                 {
1143                         $params = array(
1144                                 'width' => '120',
1145                                 'height' => '120',
1146                         );
1147                         $timestamp = wfTimestamp( TS_MW, $file->getTimestamp() );
1148
1149                         $thumbnail = $file->transform( $params );
1150                         $options = array(
1151                                 'alt' => $this->msg( 'filehist-thumbtext',
1152                                         $lang->userTimeAndDate( $timestamp, $user ),
1153                                         $lang->userDate( $timestamp, $user ),
1154                                         $lang->userTime( $timestamp, $user ) )->text(),
1155                                 'file-link' => true,
1156                         );
1157
1158                         if ( !$thumbnail ) {
1159                                 return $this->msg( 'filehist-nothumb' )->escaped();
1160                         }
1161
1162                         return $thumbnail->toHtml( $options );
1163                 } else {
1164                         return $this->msg( 'filehist-nothumb' )->escaped();
1165                 }
1166         }
1167
1168         /**
1169          * @param $enable bool
1170          */
1171         protected function preventClickjacking( $enable = true ) {
1172                 $this->preventClickjacking = $enable;
1173         }
1174
1175         /**
1176          * @return bool
1177          */
1178         public function getPreventClickjacking() {
1179                 return $this->preventClickjacking;
1180         }
1181 }
1182
1183 class ImageHistoryPseudoPager extends ReverseChronologicalPager {
1184         protected $preventClickjacking = false;
1185
1186         /**
1187          * @var File
1188          */
1189         protected $mImg;
1190
1191         /**
1192          * @var Title
1193          */
1194         protected $mTitle;
1195
1196         /**
1197          * @param ImagePage $imagePage
1198          */
1199         function __construct( $imagePage ) {
1200                 parent::__construct();
1201                 $this->mImagePage = $imagePage;
1202                 $this->mTitle = clone ( $imagePage->getTitle() );
1203                 $this->mTitle->setFragment( '#filehistory' );
1204                 $this->mImg = null;
1205                 $this->mHist = array();
1206                 $this->mRange = array( 0, 0 ); // display range
1207         }
1208
1209         /**
1210          * @return Title
1211          */
1212         function getTitle() {
1213                 return $this->mTitle;
1214         }
1215
1216         function getQueryInfo() {
1217                 return false;
1218         }
1219
1220         /**
1221          * @return string
1222          */
1223         function getIndexField() {
1224                 return '';
1225         }
1226
1227         /**
1228          * @param $row object
1229          * @return string
1230          */
1231         function formatRow( $row ) {
1232                 return '';
1233         }
1234
1235         /**
1236          * @return string
1237          */
1238         function getBody() {
1239                 $s = '';
1240                 $this->doQuery();
1241                 if ( count( $this->mHist ) ) {
1242                         $list = new ImageHistoryList( $this->mImagePage );
1243                         # Generate prev/next links
1244                         $navLink = $this->getNavigationBar();
1245                         $s = $list->beginImageHistoryList( $navLink );
1246                         // Skip rows there just for paging links
1247                         for ( $i = $this->mRange[0]; $i <= $this->mRange[1]; $i++ ) {
1248                                 $file = $this->mHist[$i];
1249                                 $s .= $list->imageHistoryLine( !$file->isOld(), $file );
1250                         }
1251                         $s .= $list->endImageHistoryList( $navLink );
1252
1253                         if ( $list->getPreventClickjacking() ) {
1254                                 $this->preventClickjacking();
1255                         }
1256                 }
1257                 return $s;
1258         }
1259
1260         function doQuery() {
1261                 if ( $this->mQueryDone ) {
1262                         return;
1263                 }
1264                 $this->mImg = $this->mImagePage->getFile(); // ensure loading
1265                 if ( !$this->mImg->exists() ) {
1266                         return;
1267                 }
1268                 $queryLimit = $this->mLimit + 1; // limit plus extra row
1269                 if ( $this->mIsBackwards ) {
1270                         // Fetch the file history
1271                         $this->mHist = $this->mImg->getHistory( $queryLimit, null, $this->mOffset, false );
1272                         // The current rev may not meet the offset/limit
1273                         $numRows = count( $this->mHist );
1274                         if ( $numRows <= $this->mLimit && $this->mImg->getTimestamp() > $this->mOffset ) {
1275                                 $this->mHist = array_merge( array( $this->mImg ), $this->mHist );
1276                         }
1277                 } else {
1278                         // The current rev may not meet the offset
1279                         if ( !$this->mOffset || $this->mImg->getTimestamp() < $this->mOffset ) {
1280                                 $this->mHist[] = $this->mImg;
1281                         }
1282                         // Old image versions (fetch extra row for nav links)
1283                         $oiLimit = count( $this->mHist ) ? $this->mLimit : $this->mLimit + 1;
1284                         // Fetch the file history
1285                         $this->mHist = array_merge( $this->mHist,
1286                                 $this->mImg->getHistory( $oiLimit, $this->mOffset, null, false ) );
1287                 }
1288                 $numRows = count( $this->mHist ); // Total number of query results
1289                 if ( $numRows ) {
1290                         # Index value of top item in the list
1291                         $firstIndex = $this->mIsBackwards ?
1292                                 $this->mHist[$numRows - 1]->getTimestamp() : $this->mHist[0]->getTimestamp();
1293                         # Discard the extra result row if there is one
1294                         if ( $numRows > $this->mLimit && $numRows > 1 ) {
1295                                 if ( $this->mIsBackwards ) {
1296                                         # Index value of item past the index
1297                                         $this->mPastTheEndIndex = $this->mHist[0]->getTimestamp();
1298                                         # Index value of bottom item in the list
1299                                         $lastIndex = $this->mHist[1]->getTimestamp();
1300                                         # Display range
1301                                         $this->mRange = array( 1, $numRows - 1 );
1302                                 } else {
1303                                         # Index value of item past the index
1304                                         $this->mPastTheEndIndex = $this->mHist[$numRows - 1]->getTimestamp();
1305                                         # Index value of bottom item in the list
1306                                         $lastIndex = $this->mHist[$numRows - 2]->getTimestamp();
1307                                         # Display range
1308                                         $this->mRange = array( 0, $numRows - 2 );
1309                                 }
1310                         } else {
1311                                 # Setting indexes to an empty string means that they will be
1312                                 # omitted if they would otherwise appear in URLs. It just so
1313                                 # happens that this  is the right thing to do in the standard
1314                                 # UI, in all the relevant cases.
1315                                 $this->mPastTheEndIndex = '';
1316                                 # Index value of bottom item in the list
1317                                 $lastIndex = $this->mIsBackwards ?
1318                                         $this->mHist[0]->getTimestamp() : $this->mHist[$numRows - 1]->getTimestamp();
1319                                 # Display range
1320                                 $this->mRange = array( 0, $numRows - 1 );
1321                         }
1322                 } else {
1323                         $firstIndex = '';
1324                         $lastIndex = '';
1325                         $this->mPastTheEndIndex = '';
1326                 }
1327                 if ( $this->mIsBackwards ) {
1328                         $this->mIsFirst = ( $numRows < $queryLimit );
1329                         $this->mIsLast = ( $this->mOffset == '' );
1330                         $this->mLastShown = $firstIndex;
1331                         $this->mFirstShown = $lastIndex;
1332                 } else {
1333                         $this->mIsFirst = ( $this->mOffset == '' );
1334                         $this->mIsLast = ( $numRows < $queryLimit );
1335                         $this->mLastShown = $lastIndex;
1336                         $this->mFirstShown = $firstIndex;
1337                 }
1338                 $this->mQueryDone = true;
1339         }
1340
1341         /**
1342          * @param $enable bool
1343          */
1344         protected function preventClickjacking( $enable = true ) {
1345                 $this->preventClickjacking = $enable;
1346         }
1347
1348         /**
1349          * @return bool
1350          */
1351         public function getPreventClickjacking() {
1352                 return $this->preventClickjacking;
1353         }
1354
1355 }