includes/ImagePage.php

   1 <?php
   2 /**
   3  * Special handling for file description pages.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  * http://www.gnu.org/copyleft/gpl.html
  19  *
  20  * @file
  21  */
  22
  23 /**
  24  * Class for viewing MediaWiki file description pages
  25  *
  26  * @ingroup Media
  27  */
  28 class ImagePage extends Article {
  29
  30         /**
  31          * @var File
  32          */
  33         private $displayImg;
  34         /**
  35          * @var FileRepo
  36          */
  37         private $repo;
  38         private $fileLoaded;
  39
  40         var $mExtraDescription = false;
  41
  42         /**
  43          * @param $title Title
  44          * @return WikiFilePage
  45          */
  46         protected function newPage( Title $title ) {
  47                 // Overload mPage with a file-specific page
  48                 return new WikiFilePage( $title );
  49         }
  50
  51         /**
  52          * Constructor from a page id
  53          * @param $id Int article ID to load
  54          * @return ImagePage|null
  55          */
  56         public static function newFromID( $id ) {
  57                 $t = Title::newFromID( $id );
  58                 # @todo FIXME: Doesn't inherit right
  59                 return $t == null ? null : new self( $t );
  60                 # return $t == null ? null : new static( $t ); // PHP 5.3
  61         }
  62
  63         /**
  64          * @param $file File:
  65          * @return void
  66          */
  67         public function setFile( $file ) {
  68                 $this->mPage->setFile( $file );
  69                 $this->displayImg = $file;
  70                 $this->fileLoaded = true;
  71         }
  72
  73         protected function loadFile() {
  74                 if ( $this->fileLoaded ) {
  75                         return;
  76                 }
  77                 $this->fileLoaded = true;
  78
  79                 $this->displayImg = $img = false;
  80                 wfRunHooks( 'ImagePageFindFile', array( $this, &$img, &$this->displayImg ) );
  81                 if ( !$img ) { // not set by hook?
  82                         $img = wfFindFile( $this->getTitle() );
  83                         if ( !$img ) {
  84                                 $img = wfLocalFile( $this->getTitle() );
  85                         }
  86                 }
  87                 $this->mPage->setFile( $img );
  88                 if ( !$this->displayImg ) { // not set by hook?
  89                         $this->displayImg = $img;
  90                 }
  91                 $this->repo = $img->getRepo();
  92         }
  93
  94         /**
  95          * Handler for action=render
  96          * Include body text only; none of the image extras
  97          */
  98         public function render() {
  99                 $this->getContext()->getOutput()->setArticleBodyOnly( true );
 100                 parent::view();
 101         }
 102
 103         public function view() {
 104                 global $wgShowEXIF;
 105
 106                 $out = $this->getContext()->getOutput();
 107                 $request = $this->getContext()->getRequest();
 108                 $diff = $request->getVal( 'diff' );
 109                 $diffOnly = $request->getBool( 'diffonly', $this->getContext()->getUser()->getOption( 'diffonly' ) );
 110
 111                 if ( $this->getTitle()->getNamespace() != NS_FILE || ( isset( $diff ) && $diffOnly ) ) {
 112                         parent::view();
 113                         return;
 114                 }
 115
 116                 $this->loadFile();
 117
 118                 if ( $this->getTitle()->getNamespace() == NS_FILE && $this->mPage->getFile()->getRedirected() ) {
 119                         if ( $this->getTitle()->getDBkey() == $this->mPage->getFile()->getName() || isset( $diff ) ) {
 120                                 // mTitle is the same as the redirect target so ask Article
 121                                 // to perform the redirect for us.
 122                                 $request->setVal( 'diffonly', 'true' );
 123                                 parent::view();
 124                                 return;
 125                         } else {
 126                                 // mTitle is not the same as the redirect target so it is
 127                                 // probably the redirect page itself. Fake the redirect symbol
 128                                 $out->setPageTitle( $this->getTitle()->getPrefixedText() );
 129                                 $out->addHTML( $this->viewRedirect( Title::makeTitle( NS_FILE, $this->mPage->getFile()->getName() ),
 130                                         /* $appendSubtitle */ true, /* $forceKnown */ true ) );
 131                                 $this->mPage->doViewUpdates( $this->getContext()->getUser() );
 132                                 return;
 133                         }
 134                 }
 135
 136                 if ( $wgShowEXIF && $this->displayImg->exists() ) {
 137                         // @todo FIXME: Bad interface, see note on MediaHandler::formatMetadata().
 138                         $formattedMetadata = $this->displayImg->formatMetadata();
 139                         $showmeta = $formattedMetadata !== false;
 140                 } else {
 141                         $showmeta = false;
 142                 }
 143
 144                 if ( !$diff && $this->displayImg->exists() ) {
 145                         $out->addHTML( $this->showTOC( $showmeta ) );
 146                 }
 147
 148                 if ( !$diff ) {
 149                         $this->openShowImage();
 150                 }
 151
 152                 # No need to display noarticletext, we use our own message, output in openShowImage()
 153                 if ( $this->mPage->getID() ) {
 154                         # NS_FILE is in the user language, but this section (the actual wikitext)
 155                         # should be in page content language
 156                         $pageLang = $this->getTitle()->getPageLanguage();
 157                         $out->addHTML( Xml::openElement( 'div', array( 'id' => 'mw-imagepage-content',
 158                                 'lang' => $pageLang->getCode(), 'dir' => $pageLang->getDir(),
 159                                 'class' => 'mw-content-'.$pageLang->getDir() ) ) );
 160
 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::link(
 418                                                         $this->getTitle(),
 419                                                         $label,
 420                                                         array(),
 421                                                         array( 'page' => $page - 1 ),
 422                                                         array( 'known', 'noclasses' )
 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 = wfMsg( 'imgmultipagenext' );
 432                                                 $link = Linker::link(
 433                                                         $this->getTitle(),
 434                                                         $label,
 435                                                         array(),
 436                                                         array( 'page' => $page + 1 ),
 437                                                         array( 'known', 'noclasses' )
 438                                                 );
 439                                                 $thumb2 = Linker::makeThumbLinkObj( $this->getTitle(), $this->displayImg, $link, $label, 'none',
 440                                                         array( 'page' => $page + 1 ) );
 441                                         } else {
 442                                                 $thumb2 = '';
 443                                         }
 444
 445                                         global $wgScript;
 446
 447                                         $formParams = array(
 448                                                 'name' => 'pageselector',
 449                                                 'action' => $wgScript,
 450                                                 'onchange' => 'document.pageselector.submit();',
 451                                         );
 452                                         $options = array();
 453                                         for ( $i = 1; $i <= $count; $i++ ) {
 454                                                 $options[] = Xml::option( $lang->formatNum( $i ), $i, $i == $page );
 455                                         }
 456                                         $select = Xml::tags( 'select',
 457                                                 array( 'id' => 'pageselector', 'name' => 'page' ),
 458                                                 implode( "\n", $options ) );
 459
 460                                         $out->addHTML(
 461                                                 '</td><td><div class="multipageimagenavbox">' .
 462                                                 Xml::openElement( 'form', $formParams ) .
 463                                                 Html::hidden( 'title', $this->getTitle()->getPrefixedDBkey() ) .
 464                                                 wfMsgExt( 'imgmultigoto', array( 'parseinline', 'replaceafter' ), $select ) .
 465                                                 Xml::submitButton( wfMsg( 'imgmultigo' ) ) .
 466                                                 Xml::closeElement( 'form' ) .
 467                                                 "<hr />$thumb1\n$thumb2<br style=\"clear: both\" /></div></td></tr></table>"
 468                                         );
 469                                 }
 470                         } else {
 471                                 # if direct link is allowed but it's not a renderable image, show an icon.
 472                                 if ( $this->displayImg->isSafeFile() ) {
 473                                         $icon = $this->displayImg->iconThumb();
 474
 475                                         $out->addHTML( '<div class="fullImageLink" id="file">' .
 476                                                 $icon->toHtml( array( 'file-link' => true ) ) .
 477                                                 "</div>\n" );
 478                                 }
 479
 480                                 $showLink = true;
 481                         }
 482
 483                         if ( $showLink ) {
 484                                 $filename = wfEscapeWikiText( $this->displayImg->getName() );
 485                                 $linktext = $filename;
 486                                 if ( isset( $msgbig ) ) {
 487                                         $linktext = wfEscapeWikiText( $msgbig );
 488                                 }
 489                                 $medialink = "[[Media:$filename|$linktext]]";
 490
 491                                 if ( !$this->displayImg->isSafeFile() ) {
 492                                         $warning = wfMsgNoTrans( 'mediawarning' );
 493                                         // dirmark is needed here to separate the file name, which
 494                                         // most likely ends in Latin characters, from the description,
 495                                         // which may begin with the file type. In RTL environment
 496                                         // this will get messy.
 497                                         // The dirmark, however, must not be immediately adjacent
 498                                         // to the filename, because it can get copied with it.
 499                                         // See bug 25277.
 500                                         $out->addWikiText( <<<EOT
 501 <div class="fullMedia"><span class="dangerousLink">{$medialink}</span> $dirmark<span class="fileInfo">$longDesc</span></div>
 502 <div class="mediaWarning">$warning</div>
 503 EOT
 504                                                 );
 505                                 } else {
 506                                         $out->addWikiText( <<<EOT
 507 <div class="fullMedia">{$medialink} {$dirmark}<span class="fileInfo">$longDesc</span>
 508 </div>
 509 EOT
 510                                         );
 511                                 }
 512                         }
 513
 514                         if ( !$this->displayImg->isLocal() ) {
 515                                 $this->printSharedImageText();
 516                         }
 517                 } else {
 518                         # Image does not exist
 519                         if ( !$this->getID() ) {
 520                                 # No article exists either
 521                                 # Show deletion log to be consistent with normal articles
 522                                 LogEventsList::showLogExtract(
 523                                         $out,
 524                                         array( 'delete', 'move' ),
 525                                         $this->getTitle()->getPrefixedText(),
 526                                         '',
 527                                         array(  'lim' => 10,
 528                                                 'conds' => array( "log_action != 'revision'" ),
 529                                                 'showIfEmpty' => false,
 530                                                 'msgKey' => array( 'moveddeleted-notice' )
 531                                         )
 532                                 );
 533                         }
 534
 535                         if ( $wgEnableUploads && $user->isAllowed( 'upload' ) ) {
 536                                 // Only show an upload link if the user can upload
 537                                 $uploadTitle = SpecialPage::getTitleFor( 'Upload' );
 538                                 $nofile = array(
 539                                         'filepage-nofile-link',
 540                                         $uploadTitle->getFullURL( array( 'wpDestFile' => $this->mPage->getFile()->getName() ) )
 541                                 );
 542                         } else {
 543                                 $nofile = 'filepage-nofile';
 544                         }
 545                         // Note, if there is an image description page, but
 546                         // no image, then this setRobotPolicy is overriden
 547                         // by Article::View().
 548                         $out->setRobotPolicy( 'noindex,nofollow' );
 549                         $out->wrapWikiMsg( "<div id='mw-imagepage-nofile' class='plainlinks'>\n$1\n</div>", $nofile );
 550                         if ( !$this->getID() && $wgSend404Code ) {
 551                                 // If there is no image, no shared image, and no description page,
 552                                 // output a 404, to be consistent with articles.
 553                                 $request->response()->header( 'HTTP/1.1 404 Not Found' );
 554                         }
 555                 }
 556                 $out->setFileVersion( $this->displayImg );
 557         }
 558
 559         /**
 560          * Creates an thumbnail of specified size and returns an HTML link to it
 561          * @param $params array Scaler parameters
 562          * @param $width int
 563          * @param $height int
 564          * @return string
 565          */
 566         private function makeSizeLink( $params, $width, $height ) {
 567                 $params['width'] = $width;
 568                 $params['height'] = $height;
 569                 $thumbnail = $this->displayImg->transform( $params );
 570                 if ( $thumbnail && !$thumbnail->isError() ) {
 571                         return Html::rawElement( 'a', array(
 572                                 'href' => $thumbnail->getUrl(),
 573                                 'class' => 'mw-thumbnail-link'
 574                                 ), wfMessage( 'show-big-image-size' )->numParams(
 575                                         $thumbnail->getWidth(), $thumbnail->getHeight()
 576                                 )->parse() );
 577                 } else {
 578                         return '';
 579                 }
 580         }
 581
 582         /**
 583          * Show a notice that the file is from a shared repository
 584          */
 585         protected function printSharedImageText() {
 586                 $out = $this->getContext()->getOutput();
 587                 $this->loadFile();
 588
 589                 $descUrl = $this->mPage->getFile()->getDescriptionUrl();
 590                 $descText = $this->mPage->getFile()->getDescriptionText();
 591
 592                 /* Add canonical to head if there is no local page for this shared file */
 593                 if( $descUrl && $this->mPage->getID() == 0 ) {
 594                         $out->addLink( array( 'rel' => 'canonical', 'href' => $descUrl ) );
 595                 }
 596
 597                 $wrap = "<div class=\"sharedUploadNotice\">\n$1\n</div>\n";
 598                 $repo = $this->mPage->getFile()->getRepo()->getDisplayName();
 599
 600                 if ( $descUrl && $descText && wfMsgNoTrans( 'sharedupload-desc-here' ) !== '-'  ) {
 601                         $out->wrapWikiMsg( $wrap, array( 'sharedupload-desc-here', $repo, $descUrl ) );
 602                 } elseif ( $descUrl && wfMsgNoTrans( 'sharedupload-desc-there' ) !== '-' ) {
 603                         $out->wrapWikiMsg( $wrap, array( 'sharedupload-desc-there', $repo, $descUrl ) );
 604                 } else {
 605                         $out->wrapWikiMsg( $wrap, array( 'sharedupload', $repo ), ''/*BACKCOMPAT*/ );
 606                 }
 607
 608                 if ( $descText ) {
 609                         $this->mExtraDescription = $descText;
 610                 }
 611         }
 612
 613         public function getUploadUrl() {
 614                 $this->loadFile();
 615                 $uploadTitle = SpecialPage::getTitleFor( 'Upload' );
 616                 return $uploadTitle->getFullURL( array(
 617                         'wpDestFile' => $this->mPage->getFile()->getName(),
 618                         'wpForReUpload' => 1
 619                  ) );
 620         }
 621
 622         /**
 623          * Print out the various links at the bottom of the image page, e.g. reupload,
 624          * external editing (and instructions link) etc.
 625          */
 626         protected function uploadLinksBox() {
 627                 global $wgEnableUploads, $wgUseExternalEditor;
 628
 629                 if ( !$wgEnableUploads ) {
 630                         return;
 631                 }
 632
 633                 $this->loadFile();
 634                 if ( !$this->mPage->getFile()->isLocal() ) {
 635                         return;
 636                 }
 637
 638                 $out = $this->getContext()->getOutput();
 639                 $out->addHTML( "<br /><ul>\n" );
 640
 641                 # "Upload a new version of this file" link
 642                 if ( UploadBase::userCanReUpload( $this->getContext()->getUser(), $this->mPage->getFile()->name ) ) {
 643                         $ulink = Linker::makeExternalLink( $this->getUploadUrl(), wfMsg( 'uploadnewversion-linktext' ) );
 644                         $out->addHTML( "<li id=\"mw-imagepage-reupload-link\"><div class=\"plainlinks\">{$ulink}</div></li>\n" );
 645                 }
 646
 647                 # External editing link
 648                 if ( $wgUseExternalEditor ) {
 649                         $elink = Linker::link(
 650                                 $this->getTitle(),
 651                                 wfMsgHtml( 'edit-externally' ),
 652                                 array(),
 653                                 array(
 654                                         'action' => 'edit',
 655                                         'externaledit' => 'true',
 656                                         'mode' => 'file'
 657                                 ),
 658                                 array( 'known', 'noclasses' )
 659                         );
 660                         $out->addHTML(
 661                                 '<li id="mw-imagepage-edit-external">' . $elink . ' <small>' .
 662                                 wfMsgExt( 'edit-externally-help', array( 'parseinline' ) ) .
 663                                 "</small></li>\n"
 664                         );
 665                 }
 666
 667                 $out->addHTML( "</ul>\n" );
 668         }
 669
 670         protected function closeShowImage() { } # For overloading
 671
 672         /**
 673          * If the page we've just displayed is in the "Image" namespace,
 674          * we follow it with an upload history of the image and its usage.
 675          */
 676         protected function imageHistory() {
 677                 $this->loadFile();
 678                 $out = $this->getContext()->getOutput();
 679                 $pager = new ImageHistoryPseudoPager( $this );
 680                 $out->addHTML( $pager->getBody() );
 681                 $out->preventClickjacking( $pager->getPreventClickjacking() );
 682
 683                 $this->mPage->getFile()->resetHistory(); // free db resources
 684
 685                 # Exist check because we don't want to show this on pages where an image
 686                 # doesn't exist along with the noimage message, that would suck. -ævar
 687                 if ( $this->mPage->getFile()->exists() ) {
 688                         $this->uploadLinksBox();
 689                 }
 690         }
 691
 692         /**
 693          * @param $target
 694          * @param $limit
 695          * @return ResultWrapper
 696          */
 697         protected function queryImageLinks( $target, $limit ) {
 698                 $dbr = wfGetDB( DB_SLAVE );
 699
 700                 return $dbr->select(
 701                         array( 'imagelinks', 'page' ),
 702                         array( 'page_namespace', 'page_title', 'page_is_redirect', 'il_to' ),
 703                         array( 'il_to' => $target, 'il_from = page_id' ),
 704                         __METHOD__,
 705                         array( 'LIMIT' => $limit + 1, 'ORDER BY' => 'il_from', )
 706                 );
 707         }
 708
 709         protected function imageLinks() {
 710                 $limit = 100;
 711
 712                 $out = $this->getContext()->getOutput();
 713                 $res = $this->queryImageLinks( $this->getTitle()->getDbKey(), $limit + 1);
 714                 $rows = array();
 715                 $redirects = array();
 716                 foreach ( $res as $row ) {
 717                         if ( $row->page_is_redirect ) {
 718                                 $redirects[$row->page_title] = array();
 719                         }
 720                         $rows[] = $row;
 721                 }
 722                 $count = count( $rows );
 723
 724                 $hasMore = $count > $limit;
 725                 if ( !$hasMore && count( $redirects ) ) {
 726                         $res = $this->queryImageLinks( array_keys( $redirects ),
 727                                 $limit - count( $rows ) + 1 );
 728                         foreach ( $res as $row ) {
 729                                 $redirects[$row->il_to][] = $row;
 730                                 $count++;
 731                         }
 732                         $hasMore = ( $res->numRows() + count( $rows ) ) > $limit;
 733                 }
 734
 735                 if ( $count == 0 ) {
 736                         $out->wrapWikiMsg(
 737                                 Html::rawElement( 'div',
 738                                         array( 'id' => 'mw-imagepage-nolinkstoimage' ), "\n$1\n" ),
 739                                 'nolinkstoimage'
 740                         );
 741                         return;
 742                 }
 743
 744                 $out->addHTML( "<div id='mw-imagepage-section-linkstoimage'>\n" );
 745                 if ( !$hasMore ) {
 746                         $out->addWikiMsg( 'linkstoimage', $count );
 747                 } else {
 748                         // More links than the limit. Add a link to [[Special:Whatlinkshere]]
 749                         $out->addWikiMsg( 'linkstoimage-more',
 750                                 $this->getContext()->getLanguage()->formatNum( $limit ),
 751                                 $this->getTitle()->getPrefixedDBkey()
 752                         );
 753                 }
 754
 755                 $out->addHTML(
 756                         Html::openElement( 'ul',
 757                                 array( 'class' => 'mw-imagepage-linkstoimage' ) ) . "\n"
 758                 );
 759                 $count = 0;
 760
 761                 // Sort the list by namespace:title
 762                 usort( $rows, array( $this, 'compare' ) );
 763
 764                 // Create links for every element
 765                 $currentCount = 0;
 766                 foreach( $rows as $element ) {
 767                         $currentCount++;
 768                         if ( $currentCount > $limit ) {
 769                                 break;
 770                         }
 771
 772                         $link = Linker::linkKnown( Title::makeTitle( $element->page_namespace, $element->page_title ) );
 773                         if ( !isset( $redirects[$element->page_title] ) ) {
 774                                 $liContents = $link;
 775                         } else {
 776                                 $ul = "<ul class='mw-imagepage-redirectstofile'>\n";
 777                                 foreach ( $redirects[$element->page_title] as $row ) {
 778                                         $currentCount++;
 779                                         if ( $currentCount > $limit ) {
 780                                                 break;
 781                                         }
 782
 783                                         $link2 = Linker::linkKnown( Title::makeTitle( $row->page_namespace, $row->page_title ) );
 784                                         $ul .= Html::rawElement(
 785                                                 'li',
 786                                                 array( 'id' => 'mw-imagepage-linkstoimage-ns' . $element->page_namespace ),
 787                                                 $link2
 788                                                 ) . "\n";
 789                                 }
 790                                 $ul .= '</ul>';
 791                                 $liContents = wfMessage( 'linkstoimage-redirect' )->rawParams(
 792                                         $link, $ul )->parse();
 793                         }
 794                         $out->addHTML( Html::rawElement(
 795                                         'li',
 796                                         array( 'id' => 'mw-imagepage-linkstoimage-ns' . $element->page_namespace ),
 797                                         $liContents
 798                                 ) . "\n"
 799                         );
 800
 801                 };
 802                 $out->addHTML( Html::closeElement( 'ul' ) . "\n" );
 803                 $res->free();
 804
 805                 // Add a links to [[Special:Whatlinkshere]]
 806                 if ( $count > $limit ) {
 807                         $out->addWikiMsg( 'morelinkstoimage', $this->getTitle()->getPrefixedDBkey() );
 808                 }
 809                 $out->addHTML( Html::closeElement( 'div' ) . "\n" );
 810         }
 811
 812         protected function imageDupes() {
 813                 $this->loadFile();
 814                 $out = $this->getContext()->getOutput();
 815
 816                 $dupes = $this->mPage->getDuplicates();
 817                 if ( count( $dupes ) == 0 ) {
 818                         return;
 819                 }
 820
 821                 $out->addHTML( "<div id='mw-imagepage-section-duplicates'>\n" );
 822                 $out->addWikiMsg( 'duplicatesoffile',
 823                         $this->getContext()->getLanguage()->formatNum( count( $dupes ) ), $this->getTitle()->getDBkey()
 824                 );
 825                 $out->addHTML( "<ul class='mw-imagepage-duplicates'>\n" );
 826
 827                 /**
 828                  * @var $file File
 829                  */
 830                 foreach ( $dupes as $file ) {
 831                         $fromSrc = '';
 832                         if ( $file->isLocal() ) {
 833                                 $link = Linker::link(
 834                                         $file->getTitle(),
 835                                         null,
 836                                         array(),
 837                                         array(),
 838                                         array( 'known', 'noclasses' )
 839                                 );
 840                         } else {
 841                                 $link = Linker::makeExternalLink( $file->getDescriptionUrl(),
 842                                         $file->getTitle()->getPrefixedText() );
 843                                 $fromSrc = wfMsg( 'shared-repo-from', $file->getRepo()->getDisplayName() );
 844                         }
 845                         $out->addHTML( "<li>{$link} {$fromSrc}</li>\n" );
 846                 }
 847                 $out->addHTML( "</ul></div>\n" );
 848         }
 849
 850         /**
 851          * Delete the file, or an earlier version of it
 852          */
 853         public function delete() {
 854                 $file = $this->mPage->getFile();
 855                 if ( !$file->exists() || !$file->isLocal() || $file->getRedirected() ) {
 856                         // Standard article deletion
 857                         parent::delete();
 858                         return;
 859                 }
 860
 861                 $deleter = new FileDeleteForm( $file );
 862                 $deleter->execute();
 863         }
 864
 865         /**
 866          * Display an error with a wikitext description
 867          *
 868          * @param $description String
 869          */
 870         function showError( $description ) {
 871                 $out = $this->getContext()->getOutput();
 872                 $out->setPageTitle( wfMessage( 'internalerror' ) );
 873                 $out->setRobotPolicy( 'noindex,nofollow' );
 874                 $out->setArticleRelated( false );
 875                 $out->enableClientCache( false );
 876                 $out->addWikiText( $description );
 877         }
 878
 879         /**
 880          * Callback for usort() to do link sorts by (namespace, title)
 881          * Function copied from Title::compare()
 882          *
 883          * @param $a object page to compare with
 884          * @param $b object page to compare with
 885          * @return Integer: result of string comparison, or namespace comparison
 886          */
 887         protected function compare( $a, $b ) {
 888                 if ( $a->page_namespace == $b->page_namespace ) {
 889                         return strcmp( $a->page_title, $b->page_title );
 890                 } else {
 891                         return $a->page_namespace - $b->page_namespace;
 892                 }
 893         }
 894 }
 895
 896 /**
 897  * Builds the image revision log shown on image pages
 898  *
 899  * @ingroup Media
 900  */
 901 class ImageHistoryList extends ContextSource {
 902
 903         /**
 904          * @var Title
 905          */
 906         protected $title;
 907
 908         /**
 909          * @var File
 910          */
 911         protected $img;
 912
 913         /**
 914          * @var ImagePage
 915          */
 916         protected $imagePage;
 917
 918         /**
 919          * @var File
 920          */
 921         protected $current;
 922
 923         protected $repo, $showThumb;
 924         protected $preventClickjacking = false;
 925
 926         /**
 927          * @param ImagePage $imagePage
 928          */
 929         public function __construct( $imagePage ) {
 930                 global $wgShowArchiveThumbnails;
 931                 $this->current = $imagePage->getFile();
 932                 $this->img = $imagePage->getDisplayedFile();
 933                 $this->title = $imagePage->getTitle();
 934                 $this->imagePage = $imagePage;
 935                 $this->showThumb = $wgShowArchiveThumbnails && $this->img->canRender();
 936                 $this->setContext( $imagePage->getContext() );
 937         }
 938
 939         /**
 940          * @return ImagePage
 941          */
 942         public function getImagePage() {
 943                 return $this->imagePage;
 944         }
 945
 946         /**
 947          * @return File
 948          */
 949         public function getFile() {
 950                 return $this->img;
 951         }
 952
 953         /**
 954          * @param $navLinks string
 955          * @return string
 956          */
 957         public function beginImageHistoryList( $navLinks = '' ) {
 958                 return Xml::element( 'h2', array( 'id' => 'filehistory' ), wfMsg( 'filehist' ) ) . "\n"
 959                         . "<div id=\"mw-imagepage-section-filehistory\">\n"
 960                         . $this->getOutput()->parse( wfMsgNoTrans( 'filehist-help' ) )
 961                         . $navLinks . "\n"
 962                         . Xml::openElement( 'table', array( 'class' => 'wikitable filehistory' ) ) . "\n"
 963                         . '<tr><td></td>'
 964                         . ( $this->current->isLocal() && ( $this->getUser()->isAllowedAny( 'delete', 'deletedhistory' ) ) ? '<td></td>' : '' )
 965                         . '<th>' . wfMsgHtml( 'filehist-datetime' ) . '</th>'
 966                         . ( $this->showThumb ? '<th>' . wfMsgHtml( 'filehist-thumb' ) . '</th>' : '' )
 967                         . '<th>' . wfMsgHtml( 'filehist-dimensions' ) . '</th>'
 968                         . '<th>' . wfMsgHtml( 'filehist-user' ) . '</th>'
 969                         . '<th>' . wfMsgHtml( 'filehist-comment' ) . '</th>'
 970                         . "</tr>\n";
 971         }
 972
 973         /**
 974          * @param $navLinks string
 975          * @return string
 976          */
 977         public function endImageHistoryList( $navLinks = '' ) {
 978                 return "</table>\n$navLinks\n</div>\n";
 979         }
 980
 981         /**
 982          * @param $iscur
 983          * @param $file File
 984          * @return string
 985          */
 986         public function imageHistoryLine( $iscur, $file ) {
 987                 global $wgContLang;
 988
 989                 $user = $this->getUser();
 990                 $lang = $this->getLanguage();
 991                 $timestamp = wfTimestamp( TS_MW, $file->getTimestamp() );
 992                 $img = $iscur ? $file->getName() : $file->getArchiveName();
 993                 $userId = $file->getUser( 'id' );
 994                 $userText = $file->getUser( 'text' );
 995                 $description = $file->getDescription( File::FOR_THIS_USER, $user );
 996
 997                 $local = $this->current->isLocal();
 998                 $row = $selected = '';
 999
1000                 // Deletion link
1001                 if ( $local && ( $user->isAllowedAny( 'delete', 'deletedhistory' ) ) ) {
1002                         $row .= '<td>';
1003                         # Link to remove from history
1004                         if ( $user->isAllowed( 'delete' ) ) {
1005                                 $q = array( 'action' => 'delete' );
1006                                 if ( !$iscur ) {
1007                                         $q['oldimage'] = $img;
1008                                 }
1009                                 $row .= Linker::link(
1010                                         $this->title,
1011                                         wfMsgHtml( $iscur ? 'filehist-deleteall' : 'filehist-deleteone' ),
1012                                         array(), $q, array( 'known' )
1013                                 );
1014                         }
1015                         # Link to hide content. Don't show useless link to people who cannot hide revisions.
1016                         $canHide = $user->isAllowed( 'deleterevision' );
1017                         if ( $canHide || ( $user->isAllowed( 'deletedhistory' ) && $file->getVisibility() ) ) {
1018                                 if ( $user->isAllowed( 'delete' ) ) {
1019                                         $row .= '<br />';
1020                                 }
1021                                 // If file is top revision or locked from this user, don't link
1022                                 if ( $iscur || !$file->userCan( File::DELETED_RESTRICTED ) ) {
1023                                         $del = Linker::revDeleteLinkDisabled( $canHide );
1024                                 } else {
1025                                         list( $ts, ) = explode( '!', $img, 2 );
1026                                         $query = array(
1027                                                 'type'   => 'oldimage',
1028                                                 'target' => $this->title->getPrefixedText(),
1029                                                 'ids'    => $ts,
1030                                         );
1031                                         $del = Linker::revDeleteLink( $query,
1032                                                 $file->isDeleted( File::DELETED_RESTRICTED ), $canHide );
1033                                 }
1034                                 $row .= $del;
1035                         }
1036                         $row .= '</td>';
1037                 }
1038
1039                 // Reversion link/current indicator
1040                 $row .= '<td>';
1041                 if ( $iscur ) {
1042                         $row .= wfMsgHtml( 'filehist-current' );
1043                 } elseif ( $local && $this->title->quickUserCan( 'edit' )
1044                         && $this->title->quickUserCan( 'upload' )
1045                 ) {
1046                         if ( $file->isDeleted( File::DELETED_FILE ) ) {
1047                                 $row .= wfMsgHtml( 'filehist-revert' );
1048                         } else {
1049                                 $row .= Linker::link(
1050                                         $this->title,
1051                                         wfMsgHtml( 'filehist-revert' ),
1052                                         array(),
1053                                         array(
1054                                                 'action' => 'revert',
1055                                                 'oldimage' => $img,
1056                                                 'wpEditToken' => $user->getEditToken( $img )
1057                                         ),
1058                                         array( 'known', 'noclasses' )
1059                                 );
1060                         }
1061                 }
1062                 $row .= '</td>';
1063
1064                 // Date/time and image link
1065                 if ( $file->getTimestamp() === $this->img->getTimestamp() ) {
1066                         $selected = "class='filehistory-selected'";
1067                 }
1068                 $row .= "<td $selected style='white-space: nowrap;'>";
1069                 if ( !$file->userCan( File::DELETED_FILE ) ) {
1070                         # Don't link to unviewable files
1071                         $row .= '<span class="history-deleted">' . $lang->timeanddate( $timestamp, true ) . '</span>';
1072                 } elseif ( $file->isDeleted( File::DELETED_FILE ) ) {
1073                         if ( $local ) {
1074                                 $this->preventClickjacking();
1075                                 $revdel = SpecialPage::getTitleFor( 'Revisiondelete' );
1076                                 # Make a link to review the image
1077                                 $url = Linker::link(
1078                                         $revdel,
1079                                         $lang->timeanddate( $timestamp, true ),
1080                                         array(),
1081                                         array(
1082                                                 'target' => $this->title->getPrefixedText(),
1083                                                 'file' => $img,
1084                                                 'token' => $user->getEditToken( $img )
1085                                         ),
1086                                         array( 'known', 'noclasses' )
1087                                 );
1088                         } else {
1089                                 $url = $lang->timeanddate( $timestamp, true );
1090                         }
1091                         $row .= '<span class="history-deleted">' . $url . '</span>';
1092                 } else {
1093                         $url = $iscur ? $this->current->getUrl() : $this->current->getArchiveUrl( $img );
1094                         $row .= Xml::element( 'a', array( 'href' => $url ), $lang->timeanddate( $timestamp, true ) );
1095                 }
1096                 $row .= "</td>";
1097
1098                 // Thumbnail
1099                 if ( $this->showThumb ) {
1100                         $row .= '<td>' . $this->getThumbForLine( $file ) . '</td>';
1101                 }
1102
1103                 // Image dimensions + size
1104                 $row .= '<td>';
1105                 $row .= htmlspecialchars( $file->getDimensionsString() );
1106                 $row .= $this->getContext()->msg( 'word-separator' )->plain();
1107                 $row .= '<span style="white-space: nowrap;">';
1108                 $row .= $this->getContext()->msg( 'parentheses' )->rawParams( Linker::formatSize( $file->getSize() ) )->plain();
1109                 $row .= '</span>';
1110                 $row .= '</td>';
1111
1112                 // Uploading user
1113                 $row .= '<td>';
1114                 // Hide deleted usernames
1115                 if ( $file->isDeleted( File::DELETED_USER ) ) {
1116                         $row .= '<span class="history-deleted">' . wfMsgHtml( 'rev-deleted-user' ) . '</span>';
1117                 } else {
1118                         if ( $local ) {
1119                                 $row .= Linker::userLink( $userId, $userText ) . ' <span style="white-space: nowrap;">' .
1120                                 Linker::userToolLinks( $userId, $userText ) . '</span>';
1121                         } else {
1122                                 $row .= htmlspecialchars( $userText );
1123                         }
1124                 }
1125                 $row .= '</td>';
1126
1127                 // Don't show deleted descriptions
1128                 if ( $file->isDeleted( File::DELETED_COMMENT ) ) {
1129                         $row .= '<td><span class="history-deleted">' . wfMsgHtml( 'rev-deleted-comment' ) . '</span></td>';
1130                 } else {
1131                         $row .= '<td dir="' . $wgContLang->getDir() . '">' . Linker::formatComment( $description, $this->title ) . '</td>';
1132                 }
1133
1134                 $rowClass = null;
1135                 wfRunHooks( 'ImagePageFileHistoryLine', array( $this, $file, &$row, &$rowClass ) );
1136                 $classAttr = $rowClass ? " class='$rowClass'" : '';
1137
1138                 return "<tr{$classAttr}>{$row}</tr>\n";
1139         }
1140
1141         /**
1142          * @param $file File
1143          * @return string
1144          */
1145         protected function getThumbForLine( $file ) {
1146                 $lang = $this->getLanguage();
1147                 if ( $file->allowInlineDisplay() && $file->userCan( File::DELETED_FILE ) && !$file->isDeleted( File::DELETED_FILE ) ) {
1148                         $params = array(
1149                                 'width' => '120',
1150                                 'height' => '120',
1151                         );
1152                         $timestamp = wfTimestamp( TS_MW, $file->getTimestamp() );
1153
1154                         $thumbnail = $file->transform( $params );
1155                         $options = array(
1156                                 'alt' => wfMsg( 'filehist-thumbtext',
1157                                         $lang->timeanddate( $timestamp, true ),
1158                                         $lang->date( $timestamp, true ),
1159                                         $lang->time( $timestamp, true ) ),
1160                                 'file-link' => true,
1161                         );
1162
1163                         if ( !$thumbnail ) {
1164                                 return wfMsgHtml( 'filehist-nothumb' );
1165                         }
1166
1167                         return $thumbnail->toHtml( $options );
1168                 } else {
1169                         return wfMsgHtml( 'filehist-nothumb' );
1170                 }
1171         }
1172
1173         /**
1174          * @param $enable bool
1175          */
1176         protected function preventClickjacking( $enable = true ) {
1177                 $this->preventClickjacking = $enable;
1178         }
1179
1180         /**
1181          * @return bool
1182          */
1183         public function getPreventClickjacking() {
1184                 return $this->preventClickjacking;
1185         }
1186 }
1187
1188 class ImageHistoryPseudoPager extends ReverseChronologicalPager {
1189         protected $preventClickjacking = false;
1190
1191         /**
1192          * @var File
1193          */
1194         protected $mImg;
1195
1196         /**
1197          * @var Title
1198          */
1199         protected $mTitle;
1200
1201         /**
1202          * @param ImagePage $imagePage
1203          */
1204         function __construct( $imagePage ) {
1205                 parent::__construct();
1206                 $this->mImagePage = $imagePage;
1207                 $this->mTitle = clone ( $imagePage->getTitle() );
1208                 $this->mTitle->setFragment( '#filehistory' );
1209                 $this->mImg = null;
1210                 $this->mHist = array();
1211                 $this->mRange = array( 0, 0 ); // display range
1212         }
1213
1214         /**
1215          * @return Title
1216          */
1217         function getTitle() {
1218                 return $this->mTitle;
1219         }
1220
1221         function getQueryInfo() {
1222                 return false;
1223         }
1224
1225         /**
1226          * @return string
1227          */
1228         function getIndexField() {
1229                 return '';
1230         }
1231
1232         /**
1233          * @param $row object
1234          * @return string
1235          */
1236         function formatRow( $row ) {
1237                 return '';
1238         }
1239
1240         /**
1241          * @return string
1242          */
1243         function getBody() {
1244                 $s = '';
1245                 $this->doQuery();
1246                 if ( count( $this->mHist ) ) {
1247                         $list = new ImageHistoryList( $this->mImagePage );
1248                         # Generate prev/next links
1249                         $navLink = $this->getNavigationBar();
1250                         $s = $list->beginImageHistoryList( $navLink );
1251                         // Skip rows there just for paging links
1252                         for ( $i = $this->mRange[0]; $i <= $this->mRange[1]; $i++ ) {
1253                                 $file = $this->mHist[$i];
1254                                 $s .= $list->imageHistoryLine( !$file->isOld(), $file );
1255                         }
1256                         $s .= $list->endImageHistoryList( $navLink );
1257
1258                         if ( $list->getPreventClickjacking() ) {
1259                                 $this->preventClickjacking();
1260                         }
1261                 }
1262                 return $s;
1263         }
1264
1265         function doQuery() {
1266                 if ( $this->mQueryDone ) {
1267                         return;
1268                 }
1269                 $this->mImg = $this->mImagePage->getFile(); // ensure loading
1270                 if ( !$this->mImg->exists() ) {
1271                         return;
1272                 }
1273                 $queryLimit = $this->mLimit + 1; // limit plus extra row
1274                 if ( $this->mIsBackwards ) {
1275                         // Fetch the file history
1276                         $this->mHist = $this->mImg->getHistory( $queryLimit, null, $this->mOffset, false );
1277                         // The current rev may not meet the offset/limit
1278                         $numRows = count( $this->mHist );
1279                         if ( $numRows <= $this->mLimit && $this->mImg->getTimestamp() > $this->mOffset ) {
1280                                 $this->mHist = array_merge( array( $this->mImg ), $this->mHist );
1281                         }
1282                 } else {
1283                         // The current rev may not meet the offset
1284                         if ( !$this->mOffset || $this->mImg->getTimestamp() < $this->mOffset ) {
1285                                 $this->mHist[] = $this->mImg;
1286                         }
1287                         // Old image versions (fetch extra row for nav links)
1288                         $oiLimit = count( $this->mHist ) ? $this->mLimit : $this->mLimit + 1;
1289                         // Fetch the file history
1290                         $this->mHist = array_merge( $this->mHist,
1291                                 $this->mImg->getHistory( $oiLimit, $this->mOffset, null, false ) );
1292                 }
1293                 $numRows = count( $this->mHist ); // Total number of query results
1294                 if ( $numRows ) {
1295                         # Index value of top item in the list
1296                         $firstIndex = $this->mIsBackwards ?
1297                                 $this->mHist[$numRows - 1]->getTimestamp() : $this->mHist[0]->getTimestamp();
1298                         # Discard the extra result row if there is one
1299                         if ( $numRows > $this->mLimit && $numRows > 1 ) {
1300                                 if ( $this->mIsBackwards ) {
1301                                         # Index value of item past the index
1302                                         $this->mPastTheEndIndex = $this->mHist[0]->getTimestamp();
1303                                         # Index value of bottom item in the list
1304                                         $lastIndex = $this->mHist[1]->getTimestamp();
1305                                         # Display range
1306                                         $this->mRange = array( 1, $numRows - 1 );
1307                                 } else {
1308                                         # Index value of item past the index
1309                                         $this->mPastTheEndIndex = $this->mHist[$numRows - 1]->getTimestamp();
1310                                         # Index value of bottom item in the list
1311                                         $lastIndex = $this->mHist[$numRows - 2]->getTimestamp();
1312                                         # Display range
1313                                         $this->mRange = array( 0, $numRows - 2 );
1314                                 }
1315                         } else {
1316                                 # Setting indexes to an empty string means that they will be
1317                                 # omitted if they would otherwise appear in URLs. It just so
1318                                 # happens that this  is the right thing to do in the standard
1319                                 # UI, in all the relevant cases.
1320                                 $this->mPastTheEndIndex = '';
1321                                 # Index value of bottom item in the list
1322                                 $lastIndex = $this->mIsBackwards ?
1323                                         $this->mHist[0]->getTimestamp() : $this->mHist[$numRows - 1]->getTimestamp();
1324                                 # Display range
1325                                 $this->mRange = array( 0, $numRows - 1 );
1326                         }
1327                 } else {
1328                         $firstIndex = '';
1329                         $lastIndex = '';
1330                         $this->mPastTheEndIndex = '';
1331                 }
1332                 if ( $this->mIsBackwards ) {
1333                         $this->mIsFirst = ( $numRows < $queryLimit );
1334                         $this->mIsLast = ( $this->mOffset == '' );
1335                         $this->mLastShown = $firstIndex;
1336                         $this->mFirstShown = $lastIndex;
1337                 } else {
1338                         $this->mIsFirst = ( $this->mOffset == '' );
1339                         $this->mIsLast = ( $numRows < $queryLimit );
1340                         $this->mLastShown = $lastIndex;
1341                         $this->mFirstShown = $firstIndex;
1342                 }
1343                 $this->mQueryDone = true;
1344         }
1345
1346         /**
1347          * @param $enable bool
1348          */
1349         protected function preventClickjacking( $enable = true ) {
1350                 $this->preventClickjacking = $enable;
1351         }
1352
1353         /**
1354          * @return bool
1355          */
1356         public function getPreventClickjacking() {
1357                 return $this->preventClickjacking;
1358         }
1359
1360 }