includes/ImagePage.php

   1 <?php
   2
   3 /**
   4  * Special handling for image description pages
   5  *
   6  * @ingroup Media
   7  */
   8 class ImagePage extends Article {
   9
  10         /**
  11          * @var File
  12          */
  13         private $img;
  14         private $displayImg;
  15         private $repo;
  16         private $fileLoaded;
  17
  18         var $mExtraDescription = false;
  19         var $dupes;
  20
  21         function __construct( $title ) {
  22                 parent::__construct( $title );
  23                 $this->dupes = null;
  24                 $this->repo = null;
  25         }
  26
  27         /**
  28          * @param $file File:
  29          * @return void
  30          */
  31         public function setFile( $file ) {
  32                 $this->displayImg = $file;
  33                 $this->img = $file;
  34                 $this->fileLoaded = true;
  35         }
  36
  37         protected function loadFile() {
  38                 if ( $this->fileLoaded ) {
  39                         return true;
  40                 }
  41                 $this->fileLoaded = true;
  42
  43                 $this->displayImg = $this->img = false;
  44                 wfRunHooks( 'ImagePageFindFile', array( $this, &$this->img, &$this->displayImg ) );
  45                 if ( !$this->img ) {
  46                         $this->img = wfFindFile( $this->mTitle );
  47                         if ( !$this->img ) {
  48                                 $this->img = wfLocalFile( $this->mTitle );
  49                         }
  50                 }
  51                 if ( !$this->displayImg ) {
  52                         $this->displayImg = $this->img;
  53                 }
  54                 $this->repo = $this->img->getRepo();
  55         }
  56
  57         /**
  58          * Handler for action=render
  59          * Include body text only; none of the image extras
  60          */
  61         public function render() {
  62                 global $wgOut;
  63                 $wgOut->setArticleBodyOnly( true );
  64                 parent::view();
  65         }
  66
  67         public function view() {
  68                 global $wgOut, $wgShowEXIF, $wgRequest, $wgUser;
  69
  70                 $diff = $wgRequest->getVal( 'diff' );
  71                 $diffOnly = $wgRequest->getBool( 'diffonly', $wgUser->getOption( 'diffonly' ) );
  72
  73                 if ( $this->mTitle->getNamespace() != NS_FILE || ( isset( $diff ) && $diffOnly ) ) {
  74                         return parent::view();
  75                 }
  76
  77                 $this->loadFile();
  78
  79                 if ( $this->mTitle->getNamespace() == NS_FILE && $this->img->getRedirected() ) {
  80                         if ( $this->mTitle->getDBkey() == $this->img->getName() || isset( $diff ) ) {
  81                                 // mTitle is the same as the redirect target so ask Article
  82                                 // to perform the redirect for us.
  83                                 $wgRequest->setVal( 'diffonly', 'true' );
  84                                 return parent::view();
  85                         } else {
  86                                 // mTitle is not the same as the redirect target so it is
  87                                 // probably the redirect page itself. Fake the redirect symbol
  88                                 $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
  89                                 $wgOut->addHTML( $this->viewRedirect( Title::makeTitle( NS_FILE, $this->img->getName() ),
  90                                         /* $appendSubtitle */ true, /* $forceKnown */ true ) );
  91                                 $this->viewUpdates();
  92                                 return;
  93                         }
  94                 }
  95
  96                 $this->showRedirectedFromHeader();
  97
  98                 if ( $wgShowEXIF && $this->displayImg->exists() ) {
  99                         // @todo FIXME: Bad interface, see note on MediaHandler::formatMetadata().
 100                         $formattedMetadata = $this->displayImg->formatMetadata();
 101                         $showmeta = $formattedMetadata !== false;
 102                 } else {
 103                         $showmeta = false;
 104                 }
 105
 106                 if ( !$diff && $this->displayImg->exists() ) {
 107                         $wgOut->addHTML( $this->showTOC( $showmeta ) );
 108                 }
 109
 110                 if ( !$diff ) {
 111                         $this->openShowImage();
 112                 }
 113
 114                 # No need to display noarticletext, we use our own message, output in openShowImage()
 115                 if ( $this->getID() ) {
 116                         # When $wgBetterDirectionality is enabled, NS_FILE is in the user language,
 117                         # but this section (the actual wikitext) should be in page content language
 118                         $pageLang = $this->mTitle->getPageLanguage();
 119                         $wgOut->addHTML( Xml::openElement( 'div', array( 'id' => 'mw-imagepage-content',
 120                                 'lang' => $pageLang->getCode(), 'dir' => $pageLang->getDir() ) ) );
 121                         parent::view();
 122                         $wgOut->addHTML( Xml::closeElement( 'div' ) );
 123                 } else {
 124                         # Just need to set the right headers
 125                         $wgOut->setArticleFlag( true );
 126                         $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
 127                         $this->viewUpdates();
 128                 }
 129
 130                 # Show shared description, if needed
 131                 if ( $this->mExtraDescription ) {
 132                         $fol = wfMessage( 'shareddescriptionfollows' );
 133                         if ( !$fol->isDisabled() ) {
 134                                 $wgOut->addWikiText( $fol->plain() );
 135                         }
 136                         $wgOut->addHTML( '<div id="shared-image-desc">' . $this->mExtraDescription . "</div>\n" );
 137                 }
 138
 139                 $this->closeShowImage();
 140                 $this->imageHistory();
 141                 // TODO: Cleanup the following
 142
 143                 $wgOut->addHTML( Xml::element( 'h2',
 144                         array( 'id' => 'filelinks' ),
 145                         wfMsg( 'imagelinks' ) ) . "\n" );
 146                 $this->imageDupes();
 147                 # @todo FIXME: For some freaky reason, we can't redirect to foreign images.
 148                 # Yet we return metadata about the target. Definitely an issue in the FileRepo
 149                 $this->imageLinks();
 150
 151                 # Allow extensions to add something after the image links
 152                 $html = '';
 153                 wfRunHooks( 'ImagePageAfterImageLinks', array( $this, &$html ) );
 154                 if ( $html ) {
 155                         $wgOut->addHTML( $html );
 156                 }
 157
 158                 if ( $showmeta ) {
 159                         $wgOut->addHTML( Xml::element( 'h2', array( 'id' => 'metadata' ), wfMsg( 'metadata' ) ) . "\n" );
 160                         $wgOut->addWikiText( $this->makeMetadataTable( $formattedMetadata ) );
 161                         $wgOut->addModules( array( 'mediawiki.action.view.metadata' ) );
 162                 }
 163
 164                 $css = $this->repo->getDescriptionStylesheetUrl();
 165                 if ( $css ) {
 166                         $wgOut->addStyle( $css );
 167                 }
 168         }
 169
 170         public function getRedirectTarget() {
 171                 $this->loadFile();
 172                 if ( $this->img->isLocal() ) {
 173                         return parent::getRedirectTarget();
 174                 }
 175                 // Foreign image page
 176                 $from = $this->img->getRedirected();
 177                 $to = $this->img->getName();
 178                 if ( $from == $to ) {
 179                         return null;
 180                 }
 181                 return $this->mRedirectTarget = Title::makeTitle( NS_FILE, $to );
 182         }
 183
 184         public function followRedirect() {
 185                 $this->loadFile();
 186                 if ( $this->img->isLocal() ) {
 187                         return parent::followRedirect();
 188                 }
 189                 $from = $this->img->getRedirected();
 190                 $to = $this->img->getName();
 191                 if ( $from == $to ) {
 192                         return false;
 193                 }
 194                 return Title::makeTitle( NS_FILE, $to );
 195         }
 196
 197         public function isRedirect( $text = false ) {
 198                 $this->loadFile();
 199                 if ( $this->img->isLocal() ) {
 200                         return parent::isRedirect( $text );
 201                 }
 202
 203                 return (bool)$this->img->getRedirected();
 204         }
 205
 206         public function isLocal() {
 207                 $this->loadFile();
 208                 return $this->img->isLocal();
 209         }
 210
 211         public function getFile() {
 212                 $this->loadFile();
 213                 return $this->img;
 214         }
 215
 216         public function getDisplayedFile() {
 217                 $this->loadFile();
 218                 return $this->displayImg;
 219         }
 220
 221         public function getDuplicates() {
 222                 $this->loadFile();
 223                 if ( !is_null( $this->dupes ) ) {
 224                         return $this->dupes;
 225                 }
 226                 $hash = $this->img->getSha1();
 227                 if ( !( $hash ) ) {
 228                         return $this->dupes = array();
 229                 }
 230                 $dupes = RepoGroup::singleton()->findBySha1( $hash );
 231                 // Remove duplicates with self and non matching file sizes
 232                 $self = $this->img->getRepoName() . ':' . $this->img->getName();
 233                 $size = $this->img->getSize();
 234                 foreach ( $dupes as $index => $file ) {
 235                         $key = $file->getRepoName() . ':' . $file->getName();
 236                         if ( $key == $self ) {
 237                                 unset( $dupes[$index] );
 238                         }
 239                         if ( $file->getSize() != $size ) {
 240                                 unset( $dupes[$index] );
 241                         }
 242                 }
 243                 return $this->dupes = $dupes;
 244         }
 245
 246         /**
 247          * Create the TOC
 248          *
 249          * @param $metadata Boolean: whether or not to show the metadata link
 250          * @return String
 251          */
 252         protected function showTOC( $metadata ) {
 253                 $r = array(
 254                         '<li><a href="#file">' . wfMsgHtml( 'file-anchor-link' ) . '</a></li>',
 255                         '<li><a href="#filehistory">' . wfMsgHtml( 'filehist' ) . '</a></li>',
 256                         '<li><a href="#filelinks">' . wfMsgHtml( 'imagelinks' ) . '</a></li>',
 257                 );
 258                 if ( $metadata ) {
 259                         $r[] = '<li><a href="#metadata">' . wfMsgHtml( 'metadata' ) . '</a></li>';
 260                 }
 261
 262                 wfRunHooks( 'ImagePageShowTOC', array( $this, &$r ) );
 263
 264                 return '<ul id="filetoc">' . implode( "\n", $r ) . '</ul>';
 265         }
 266
 267         /**
 268          * Make a table with metadata to be shown in the output page.
 269          *
 270          * @todo FIXME: Bad interface, see note on MediaHandler::formatMetadata().
 271          *
 272          * @param $metadata Array: the array containing the EXIF data
 273          * @return String The metadata table. This is treated as Wikitext (!)
 274          */
 275         protected function makeMetadataTable( $metadata ) {
 276                 $r = "<div class=\"mw-imagepage-section-metadata\">";
 277                 $r .= wfMsgNoTrans( 'metadata-help' );
 278                 $r .= "<table id=\"mw_metadata\" class=\"mw_metadata\">\n";
 279                 foreach ( $metadata as $type => $stuff ) {
 280                         foreach ( $stuff as $v ) {
 281                                 # @todo FIXME: Why is this using escapeId for a class?!
 282                                 $class = Sanitizer::escapeId( $v['id'] );
 283                                 if ( $type == 'collapsed' ) {
 284                                         $class .= ' collapsable';
 285                                 }
 286                                 $r .= "<tr class=\"$class\">\n";
 287                                 $r .= "<th>{$v['name']}</th>\n";
 288                                 $r .= "<td>{$v['value']}</td>\n</tr>";
 289                         }
 290                 }
 291                 $r .= "</table>\n</div>\n";
 292                 return $r;
 293         }
 294
 295         /**
 296          * Overloading Article's getContent method.
 297          *
 298          * Omit noarticletext if sharedupload; text will be fetched from the
 299          * shared upload server if possible.
 300          */
 301         public function getContent() {
 302                 $this->loadFile();
 303                 if ( $this->img && !$this->img->isLocal() && 0 == $this->getID() ) {
 304                         return '';
 305                 }
 306                 return parent::getContent();
 307         }
 308
 309         protected function openShowImage() {
 310                 global $wgOut, $wgUser, $wgImageLimits, $wgRequest,
 311                         $wgLang, $wgEnableUploads;
 312
 313                 $this->loadFile();
 314
 315                 $sizeSel = intval( $wgUser->getOption( 'imagesize' ) );
 316                 if ( !isset( $wgImageLimits[$sizeSel] ) ) {
 317                         $sizeSel = User::getDefaultOption( 'imagesize' );
 318
 319                         // The user offset might still be incorrect, specially if
 320                         // $wgImageLimits got changed (see bug #8858).
 321                         if ( !isset( $wgImageLimits[$sizeSel] ) ) {
 322                                 // Default to the first offset in $wgImageLimits
 323                                 $sizeSel = 0;
 324                         }
 325                 }
 326                 $max = $wgImageLimits[$sizeSel];
 327                 $maxWidth = $max[0];
 328                 $maxHeight = $max[1];
 329                 $sk = $wgUser->getSkin();
 330                 $dirmark = wfUILang()->getDirMark();
 331
 332                 if ( $this->displayImg->exists() ) {
 333                         # image
 334                         $page = $wgRequest->getIntOrNull( 'page' );
 335                         if ( is_null( $page ) ) {
 336                                 $params = array();
 337                                 $page = 1;
 338                         } else {
 339                                 $params = array( 'page' => $page );
 340                         }
 341                         $width_orig = $this->displayImg->getWidth( $page );
 342                         $width = $width_orig;
 343                         $height_orig = $this->displayImg->getHeight( $page );
 344                         $height = $height_orig;
 345
 346                         $longDesc = wfMsg( 'parentheses', $this->displayImg->getLongDesc() );
 347
 348                         wfRunHooks( 'ImageOpenShowImageInlineBefore', array( &$this, &$wgOut ) );
 349
 350                         if ( $this->displayImg->allowInlineDisplay() ) {
 351                                 # image
 352
 353                                 # "Download high res version" link below the image
 354                                 # $msgsize = wfMsgHtml( 'file-info-size', $width_orig, $height_orig, $sk->formatSize( $this->displayImg->getSize() ), $mime );
 355                                 # We'll show a thumbnail of this image
 356                                 if ( $width > $maxWidth || $height > $maxHeight ) {
 357                                         # Calculate the thumbnail size.
 358                                         # First case, the limiting factor is the width, not the height.
 359                                         if ( $width / $height >= $maxWidth / $maxHeight ) {
 360                                                 $height = round( $height * $maxWidth / $width );
 361                                                 $width = $maxWidth;
 362                                                 # Note that $height <= $maxHeight now.
 363                                         } else {
 364                                                 $newwidth = floor( $width * $maxHeight / $height );
 365                                                 $height = round( $height * $newwidth / $width );
 366                                                 $width = $newwidth;
 367                                                 # Note that $height <= $maxHeight now, but might not be identical
 368                                                 # because of rounding.
 369                                         }
 370                                         $msgbig  = wfMsgHtml( 'show-big-image' );
 371                                         $otherSizes = array();
 372                                         foreach ( $wgImageLimits as $size ) {
 373                                                 if ( $size[0] < $width_orig && $size[1] < $height_orig &&
 374                                                                 $size[0] != $width && $size[1] != $height ) {
 375                                                         $otherSizes[] = $this->makeSizeLink( $params, $size[0], $size[1] );
 376                                                 }
 377                                         }
 378                                         $msgsmall = wfMessage( 'show-big-image-preview' )->
 379                                                 rawParams( $this->makeSizeLink( $params, $width, $height ) )->
 380                                                 parse() . ' ' .
 381                                                 wfMessage( 'show-big-image-other' )->
 382                                                 rawParams( $wgLang->pipeList( $otherSizes ) )->parse();
 383                                 } else {
 384                                         # Image is small enough to show full size on image page
 385                                         $msgsmall = wfMsgExt( 'file-nohires', array( 'parseinline' ) );
 386                                 }
 387
 388                                 $params['width'] = $width;
 389                                 $params['height'] = $height;
 390                                 $thumbnail = $this->displayImg->transform( $params );
 391
 392                                 $showLink = true;
 393                                 $anchorclose = '<br />' . $msgsmall;
 394
 395                                 $isMulti = $this->displayImg->isMultipage() && $this->displayImg->pageCount() > 1;
 396                                 if ( $isMulti ) {
 397                                         $wgOut->addHTML( '<table class="multipageimage"><tr><td>' );
 398                                 }
 399
 400                                 if ( $thumbnail ) {
 401                                         $options = array(
 402                                                 'alt' => $this->displayImg->getTitle()->getPrefixedText(),
 403                                                 'file-link' => true,
 404                                         );
 405                                         $wgOut->addHTML( '<div class="fullImageLink" id="file">' .
 406                                                 $thumbnail->toHtml( $options ) .
 407                                                 $anchorclose . "</div>\n" );
 408                                 }
 409
 410                                 if ( $isMulti ) {
 411                                         $count = $this->displayImg->pageCount();
 412
 413                                         if ( $page > 1 ) {
 414                                                 $label = $wgOut->parse( wfMsg( 'imgmultipageprev' ), false );
 415                                                 $link = $sk->link(
 416                                                         $this->mTitle,
 417                                                         $label,
 418                                                         array(),
 419                                                         array( 'page' => $page - 1 ),
 420                                                         array( 'known', 'noclasses' )
 421                                                 );
 422                                                 $thumb1 = $sk->makeThumbLinkObj( $this->mTitle, $this->displayImg, $link, $label, 'none',
 423                                                         array( 'page' => $page - 1 ) );
 424                                         } else {
 425                                                 $thumb1 = '';
 426                                         }
 427
 428                                         if ( $page < $count ) {
 429                                                 $label = wfMsg( 'imgmultipagenext' );
 430                                                 $link = $sk->link(
 431                                                         $this->mTitle,
 432                                                         $label,
 433                                                         array(),
 434                                                         array( 'page' => $page + 1 ),
 435                                                         array( 'known', 'noclasses' )
 436                                                 );
 437                                                 $thumb2 = $sk->makeThumbLinkObj( $this->mTitle, $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
 451                                         for ( $i = 1; $i <= $count; $i++ ) {
 452                                                 $options[] = Xml::option( $wgLang->formatNum( $i ), $i, $i == $page );
 453                                         }
 454                                         $select = Xml::tags( 'select',
 455                                                 array( 'id' => 'pageselector', 'name' => 'page' ),
 456                                                 implode( "\n", $options ) );
 457
 458                                         $wgOut->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 clear=\"all\" /></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                                         $wgOut->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                                         $wgOut->addWikiText( <<<EOT
 492 <div class="fullMedia"><span class="dangerousLink">{$medialink}</span>$dirmark <span class="fileInfo">$longDesc</span></div>
 493 <div class="mediaWarning">$warning</div>
 494 EOT
 495                                                 );
 496                                 } else {
 497                                         $wgOut->addWikiText( <<<EOT
 498 <div class="fullMedia">{$medialink}{$dirmark} <span class="fileInfo">$longDesc</span>
 499 </div>
 500 EOT
 501                                         );
 502                                 }
 503                         }
 504
 505                         if ( !$this->displayImg->isLocal() ) {
 506                                 $this->printSharedImageText();
 507                         }
 508                 } else {
 509                         # Image does not exist
 510                         if ( $wgEnableUploads && $wgUser->isAllowed( 'upload' ) ) {
 511                                 // Only show an upload link if the user can upload
 512                                 $uploadTitle = SpecialPage::getTitleFor( 'Upload' );
 513                                 $nofile = array(
 514                                         'filepage-nofile-link',
 515                                         $uploadTitle->getFullURL( array( 'wpDestFile' => $this->img->getName() ) )
 516                                 );
 517                         } else {
 518                                 $nofile = 'filepage-nofile';
 519                         }
 520                         // Note, if there is an image description page, but
 521                         // no image, then this setRobotPolicy is overriden
 522                         // by Article::View().
 523                         $wgOut->setRobotPolicy( 'noindex,nofollow' );
 524                         $wgOut->wrapWikiMsg( "<div id='mw-imagepage-nofile' class='plainlinks'>\n$1\n</div>", $nofile );
 525                         if ( !$this->getID() ) {
 526                                 // If there is no image, no shared image, and no description page,
 527                                 // output a 404, to be consistent with articles.
 528                                 $wgRequest->response()->header( 'HTTP/1.1 404 Not Found' );
 529                         }
 530                 }
 531         }
 532
 533         /**
 534          * Creates an thumbnail of specified size and returns an HTML link to it
 535          * @param array $params Scaler parameters
 536          * @param int $width
 537          * @param int $height
 538          */
 539         private function makeSizeLink( $params, $width, $height ) {
 540                 $params['width'] = $width;
 541                 $params['height'] = $height;
 542                 $thumbnail = $this->displayImg->transform( $params );
 543                 if ( $thumbnail && !$thumbnail->isError() ) {
 544                         return Html::rawElement( 'a', array(
 545                                 'href' => $thumbnail->getUrl(),
 546                                 'class' => 'mw-thumbnail-link'
 547                                 ), wfMessage( 'show-big-image-size' )->numParams(
 548                                         $thumbnail->getWidth(), $thumbnail->getHeight()
 549                                 )->parse() );
 550                 } else {
 551                         return '';
 552                 }
 553         }
 554
 555         /**
 556          * Show a notice that the file is from a shared repository
 557          */
 558         protected function printSharedImageText() {
 559                 global $wgOut;
 560
 561                 $this->loadFile();
 562
 563                 $descUrl = $this->img->getDescriptionUrl();
 564                 $descText = $this->img->getDescriptionText();
 565
 566                 /* Add canonical to head if there is no local page for this shared file */
 567                 if( $descUrl && $this->getID() == 0 ) {
 568                         $wgOut->addLink( array( 'rel' => 'canonical', 'href' => $descUrl ) );
 569                 }
 570
 571                 $wrap = "<div class=\"sharedUploadNotice\">\n$1\n</div>\n";
 572                 $repo = $this->img->getRepo()->getDisplayName();
 573
 574                 if ( $descUrl && $descText && wfMsgNoTrans( 'sharedupload-desc-here' ) !== '-'  ) {
 575                         $wgOut->wrapWikiMsg( $wrap, array( 'sharedupload-desc-here', $repo, $descUrl ) );
 576                 } elseif ( $descUrl && wfMsgNoTrans( 'sharedupload-desc-there' ) !== '-' ) {
 577                         $wgOut->wrapWikiMsg( $wrap, array( 'sharedupload-desc-there', $repo, $descUrl ) );
 578                 } else {
 579                         $wgOut->wrapWikiMsg( $wrap, array( 'sharedupload', $repo ), ''/*BACKCOMPAT*/ );
 580                 }
 581
 582                 if ( $descText ) {
 583                         $this->mExtraDescription = $descText;
 584                 }
 585         }
 586
 587         public function getUploadUrl() {
 588                 $this->loadFile();
 589                 $uploadTitle = SpecialPage::getTitleFor( 'Upload' );
 590                 return $uploadTitle->getFullURL( array(
 591                         'wpDestFile' => $this->img->getName(),
 592                         'wpForReUpload' => 1
 593                  ) );
 594         }
 595
 596         /**
 597          * Print out the various links at the bottom of the image page, e.g. reupload,
 598          * external editing (and instructions link) etc.
 599          */
 600         protected function uploadLinksBox() {
 601                 global $wgUser, $wgOut, $wgEnableUploads, $wgUseExternalEditor;
 602
 603                 if ( !$wgEnableUploads ) {
 604                         return;
 605                 }
 606
 607                 $this->loadFile();
 608                 if ( !$this->img->isLocal() ) {
 609                         return;
 610                 }
 611
 612                 $sk = $wgUser->getSkin();
 613
 614                 $wgOut->addHTML( "<br /><ul>\n" );
 615
 616                 # "Upload a new version of this file" link
 617                 if ( UploadBase::userCanReUpload( $wgUser, $this->img->name ) ) {
 618                         $ulink = $sk->makeExternalLink( $this->getUploadUrl(), wfMsg( 'uploadnewversion-linktext' ) );
 619                         $wgOut->addHTML( "<li id=\"mw-imagepage-reupload-link\"><div class=\"plainlinks\">{$ulink}</div></li>\n" );
 620                 }
 621
 622                 # External editing link
 623                 if ( $wgUseExternalEditor ) {
 624                         $elink = $sk->link(
 625                                 $this->mTitle,
 626                                 wfMsgHtml( 'edit-externally' ),
 627                                 array(),
 628                                 array(
 629                                         'action' => 'edit',
 630                                         'externaledit' => 'true',
 631                                         'mode' => 'file'
 632                                 ),
 633                                 array( 'known', 'noclasses' )
 634                         );
 635                         $wgOut->addHTML(
 636                                 '<li id="mw-imagepage-edit-external">' . $elink . ' <small>' .
 637                                 wfMsgExt( 'edit-externally-help', array( 'parseinline' ) ) .
 638                                 "</small></li>\n"
 639                         );
 640                 }
 641
 642                 $wgOut->addHTML( "</ul>\n" );
 643         }
 644
 645         protected function closeShowImage() { } # For overloading
 646
 647         /**
 648          * If the page we've just displayed is in the "Image" namespace,
 649          * we follow it with an upload history of the image and its usage.
 650          */
 651         protected function imageHistory() {
 652                 global $wgOut;
 653
 654                 $this->loadFile();
 655                 $pager = new ImageHistoryPseudoPager( $this );
 656                 $wgOut->addHTML( $pager->getBody() );
 657                 $wgOut->preventClickjacking( $pager->getPreventClickjacking() );
 658
 659                 $this->img->resetHistory(); // free db resources
 660
 661                 # Exist check because we don't want to show this on pages where an image
 662                 # doesn't exist along with the noimage message, that would suck. -ævar
 663                 if ( $this->img->exists() ) {
 664                         $this->uploadLinksBox();
 665                 }
 666         }
 667
 668         protected function queryImageLinks( $target, $limit ) {
 669                 $dbr = wfGetDB( DB_SLAVE );
 670
 671                 return $dbr->select(
 672                         array( 'imagelinks', 'page' ),
 673                         array( 'page_namespace', 'page_title', 'page_is_redirect', 'il_to' ),
 674                         array( 'il_to' => $target, 'il_from = page_id' ),
 675                         __METHOD__,
 676                         array( 'LIMIT' => $limit + 1 )
 677                 );
 678         }
 679
 680         protected function imageLinks() {
 681                 global $wgUser, $wgOut, $wgLang;
 682
 683                 $limit = 100;
 684
 685                 $res = $this->queryImageLinks( $this->mTitle->getDbKey(), $limit + 1);
 686                 $rows = array();
 687                 $redirects = array();
 688                 foreach ( $res as $row ) {
 689                         if ( $row->page_is_redirect ) {
 690                                 $redirects[$row->page_title] = array();
 691                         }
 692                         $rows[] = $row;
 693                 }
 694                 $count = count( $rows );
 695
 696                 $hasMore = $count > $limit;
 697                 if ( !$hasMore && count( $redirects ) ) {
 698                         $res = $this->queryImageLinks( array_keys( $redirects ),
 699                                 $limit - count( $rows ) + 1 );
 700                         foreach ( $res as $row ) {
 701                                 $redirects[$row->il_to][] = $row;
 702                                 $count++;
 703                         }
 704                         $hasMore = ( $res->numRows() + count( $rows ) ) > $limit;
 705                 }
 706
 707                 if ( $count == 0 ) {
 708                         $wgOut->wrapWikiMsg(
 709                                 Html::rawElement( 'div',
 710                                         array( 'id' => 'mw-imagepage-nolinkstoimage' ), "\n$1\n" ),
 711                                 'nolinkstoimage'
 712                         );
 713                         return;
 714                 }
 715
 716                 $wgOut->addHTML( "<div id='mw-imagepage-section-linkstoimage'>\n" );
 717                 if ( !$hasMore ) {
 718                         $wgOut->addWikiMsg( 'linkstoimage', $count );
 719                 } else {
 720                         // More links than the limit. Add a link to [[Special:Whatlinkshere]]
 721                         $wgOut->addWikiMsg( 'linkstoimage-more',
 722                                 $wgLang->formatNum( $limit ),
 723                                 $this->mTitle->getPrefixedDBkey()
 724                         );
 725                 }
 726
 727                 $wgOut->addHTML(
 728                         Html::openElement( 'ul',
 729                                 array( 'class' => 'mw-imagepage-linkstoimage' ) ) . "\n"
 730                 );
 731                 $sk = $wgUser->getSkin();
 732                 $count = 0;
 733
 734                 // Sort the list by namespace:title
 735                 usort( $rows, array( $this, 'compare' ) );
 736
 737                 // Create links for every element
 738                 $currentCount = 0;
 739                 foreach( $rows as $element ) {
 740                         $currentCount++;
 741                         if ( $currentCount > $limit ) {
 742                                 break;
 743                         }
 744
 745                         $link = $sk->linkKnown( Title::makeTitle( $element->page_namespace, $element->page_title ) );
 746                         if ( !isset( $redirects[$element->page_title] ) ) {
 747                                 $liContents = $link;
 748                         } else {
 749                                 $ul = "<ul class='mw-imagepage-redirectstofile'>\n";
 750                                 foreach ( $redirects[$element->page_title] as $row ) {
 751                                         $currentCount++;
 752                                         if ( $currentCount > $limit ) {
 753                                                 break;
 754                                         }
 755
 756                                         $link2 = $sk->linkKnown( Title::makeTitle( $row->page_namespace, $row->page_title ) );
 757                                         $ul .= Html::rawElement(
 758                                                 'li',
 759                                                 array( 'id' => 'mw-imagepage-linkstoimage-ns' . $element->page_namespace ),
 760                                                 $link2
 761                                                 ) . "\n";
 762                                 }
 763                                 $ul .= '</ul>';
 764                                 $liContents = wfMessage( 'linkstoimage-redirect' )->rawParams(
 765                                         $link, $ul )->parse();
 766                         }
 767                         $wgOut->addHTML( Html::rawElement(
 768                                         'li',
 769                                         array( 'id' => 'mw-imagepage-linkstoimage-ns' . $element->page_namespace ),
 770                                         $liContents
 771                                 ) . "\n"
 772                         );
 773
 774                 };
 775                 $wgOut->addHTML( Html::closeElement( 'ul' ) . "\n" );
 776                 $res->free();
 777
 778                 // Add a links to [[Special:Whatlinkshere]]
 779                 if ( $count > $limit ) {
 780                         $wgOut->addWikiMsg( 'morelinkstoimage', $this->mTitle->getPrefixedDBkey() );
 781                 }
 782                 $wgOut->addHTML( Html::closeElement( 'div' ) . "\n" );
 783         }
 784
 785         protected function imageDupes() {
 786                 global $wgOut, $wgUser, $wgLang;
 787
 788                 $this->loadFile();
 789
 790                 $dupes = $this->getDuplicates();
 791                 if ( count( $dupes ) == 0 ) {
 792                         return;
 793                 }
 794
 795                 $wgOut->addHTML( "<div id='mw-imagepage-section-duplicates'>\n" );
 796                 $wgOut->addWikiMsg( 'duplicatesoffile',
 797                         $wgLang->formatNum( count( $dupes ) ), $this->mTitle->getDBkey()
 798                 );
 799                 $wgOut->addHTML( "<ul class='mw-imagepage-duplicates'>\n" );
 800
 801                 $sk = $wgUser->getSkin();
 802                 foreach ( $dupes as $file ) {
 803                         $fromSrc = '';
 804                         if ( $file->isLocal() ) {
 805                                 $link = $sk->link(
 806                                         $file->getTitle(),
 807                                         null,
 808                                         array(),
 809                                         array(),
 810                                         array( 'known', 'noclasses' )
 811                                 );
 812                         } else {
 813                                 $link = $sk->makeExternalLink( $file->getDescriptionUrl(),
 814                                         $file->getTitle()->getPrefixedText() );
 815                                 $fromSrc = wfMsg( 'shared-repo-from', $file->getRepo()->getDisplayName() );
 816                         }
 817                         $wgOut->addHTML( "<li>{$link} {$fromSrc}</li>\n" );
 818                 }
 819                 $wgOut->addHTML( "</ul></div>\n" );
 820         }
 821
 822         /**
 823          * Delete the file, or an earlier version of it
 824          */
 825         public function delete() {
 826                 global $wgUploadMaintenance;
 827                 if ( $wgUploadMaintenance && $this->mTitle && $this->mTitle->getNamespace() == NS_FILE ) {
 828                         global $wgOut;
 829                         $wgOut->wrapWikiMsg( "<div class='error'>\n$1\n</div>\n", array( 'filedelete-maintenance' ) );
 830                         return;
 831                 }
 832
 833                 $this->loadFile();
 834                 if ( !$this->img->exists() || !$this->img->isLocal() || $this->img->getRedirected() ) {
 835                         // Standard article deletion
 836                         parent::delete();
 837                         return;
 838                 }
 839                 $deleter = new FileDeleteForm( $this->img );
 840                 $deleter->execute();
 841         }
 842
 843         /**
 844          * Revert the file to an earlier version
 845          */
 846         public function revert() {
 847                 $this->loadFile();
 848                 $reverter = new FileRevertForm( $this->img );
 849                 $reverter->execute();
 850         }
 851
 852         /**
 853          * Override handling of action=purge
 854          */
 855         public function doPurge() {
 856                 $this->loadFile();
 857                 if ( $this->img->exists() ) {
 858                         wfDebug( 'ImagePage::doPurge purging ' . $this->img->getName() . "\n" );
 859                         $update = new HTMLCacheUpdate( $this->mTitle, 'imagelinks' );
 860                         $update->doUpdate();
 861                         $this->img->upgradeRow();
 862                         $this->img->purgeCache();
 863                 } else {
 864                         wfDebug( 'ImagePage::doPurge no image for ' . $this->img->getName() . "; limiting purge to cache only\n" );
 865                         // even if the file supposedly doesn't exist, force any cached information
 866                         // to be updated (in case the cached information is wrong)
 867                         $this->img->purgeCache();
 868                 }
 869                 parent::doPurge();
 870         }
 871
 872         /**
 873          * Display an error with a wikitext description
 874          */
 875         function showError( $description ) {
 876                 global $wgOut;
 877                 $wgOut->setPageTitle( wfMsg( 'internalerror' ) );
 878                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
 879                 $wgOut->setArticleRelated( false );
 880                 $wgOut->enableClientCache( false );
 881                 $wgOut->addWikiText( $description );
 882         }
 883
 884         /**
 885          * Callback for usort() to do link sorts by (namespace, title)
 886          * Function copied from Title::compare()
 887          *
 888          * @param $a object page to compare with
 889          * @param $b object page to compare with
 890          * @return Integer: result of string comparison, or namespace comparison
 891          */
 892         protected function compare( $a, $b ) {
 893                 if ( $a->page_namespace == $b->page_namespace ) {
 894                         return strcmp( $a->page_title, $b->page_title );
 895                 } else {
 896                         return $a->page_namespace - $b->page_namespace;
 897                 }
 898         }
 899 }
 900
 901 /**
 902  * Builds the image revision log shown on image pages
 903  *
 904  * @ingroup Media
 905  */
 906 class ImageHistoryList {
 907
 908         /**
 909          * @var Title
 910          */
 911         protected $title;
 912
 913         /**
 914          * @var File
 915          */
 916         protected $img;
 917
 918         /**
 919          * @var ImagePage
 920          */
 921         protected $imagePage;
 922
 923         /**
 924          * @var Skin
 925          */
 926         protected $skin;
 927
 928         protected $repo, $showThumb;
 929         protected $preventClickjacking = false;
 930
 931         /**
 932          * @param ImagePage $imagePage
 933          */
 934         public function __construct( $imagePage ) {
 935                 global $wgUser, $wgShowArchiveThumbnails;
 936                 $this->skin = $wgUser->getSkin();
 937                 $this->current = $imagePage->getFile();
 938                 $this->img = $imagePage->getDisplayedFile();
 939                 $this->title = $imagePage->getTitle();
 940                 $this->imagePage = $imagePage;
 941                 $this->showThumb = $wgShowArchiveThumbnails && $this->img->canRender();
 942         }
 943
 944         public function getImagePage() {
 945                 return $this->imagePage;
 946         }
 947
 948         public function getSkin() {
 949                 return $this->skin;
 950         }
 951
 952         public function getFile() {
 953                 return $this->img;
 954         }
 955
 956         public function beginImageHistoryList( $navLinks = '' ) {
 957                 global $wgOut, $wgUser;
 958                 return Xml::element( 'h2', array( 'id' => 'filehistory' ), wfMsg( 'filehist' ) ) . "\n"
 959                         . "<div id=\"mw-imagepage-section-filehistory\">\n"
 960                         . $wgOut->parse( wfMsgNoTrans( 'filehist-help' ) )
 961                         . $navLinks . "\n"
 962                         . Xml::openElement( 'table', array( 'class' => 'wikitable filehistory' ) ) . "\n"
 963                         . '<tr><td></td>'
 964                         . ( $this->current->isLocal() && ( $wgUser->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         public function endImageHistoryList( $navLinks = '' ) {
 974                 return "</table>\n$navLinks\n</div>\n";
 975         }
 976
 977         /**
 978          * @param $iscur
 979          * @param $file File
 980          * @return string
 981          */
 982         public function imageHistoryLine( $iscur, $file ) {
 983                 global $wgUser, $wgLang;
 984
 985                 $timestamp = wfTimestamp( TS_MW, $file->getTimestamp() );
 986                 $img = $iscur ? $file->getName() : $file->getArchiveName();
 987                 $user = $file->getUser( 'id' );
 988                 $usertext = $file->getUser( 'text' );
 989                 $description = $file->getDescription();
 990
 991                 $local = $this->current->isLocal();
 992                 $row = $selected = '';
 993
 994                 // Deletion link
 995                 if ( $local && ( $wgUser->isAllowedAny( 'delete', 'deletedhistory' ) ) ) {
 996                         $row .= '<td>';
 997                         # Link to remove from history
 998                         if ( $wgUser->isAllowed( 'delete' ) ) {
 999                                 $q = array( 'action' => 'delete' );
1000                                 if ( !$iscur ) {
1001                                         $q['oldimage'] = $img;
1002                                 }
1003                                 $row .= $this->skin->link(
1004                                         $this->title,
1005                                         wfMsgHtml( $iscur ? 'filehist-deleteall' : 'filehist-deleteone' ),
1006                                         array(), $q, array( 'known' )
1007                                 );
1008                         }
1009                         # Link to hide content. Don't show useless link to people who cannot hide revisions.
1010                         $canHide = $wgUser->isAllowed( 'deleterevision' );
1011                         if ( $canHide || ( $wgUser->isAllowed( 'deletedhistory' ) && $file->getVisibility() ) ) {
1012                                 if ( $wgUser->isAllowed( 'delete' ) ) {
1013                                         $row .= '<br />';
1014                                 }
1015                                 // If file is top revision or locked from this user, don't link
1016                                 if ( $iscur || !$file->userCan( File::DELETED_RESTRICTED ) ) {
1017                                         $del = $this->skin->revDeleteLinkDisabled( $canHide );
1018                                 } else {
1019                                         list( $ts, $name ) = explode( '!', $img, 2 );
1020                                         $query = array(
1021                                                 'type'   => 'oldimage',
1022                                                 'target' => $this->title->getPrefixedText(),
1023                                                 'ids'    => $ts,
1024                                         );
1025                                         $del = $this->skin->revDeleteLink( $query,
1026                                                 $file->isDeleted( File::DELETED_RESTRICTED ), $canHide );
1027                                 }
1028                                 $row .= $del;
1029                         }
1030                         $row .= '</td>';
1031                 }
1032
1033                 // Reversion link/current indicator
1034                 $row .= '<td>';
1035                 if ( $iscur ) {
1036                         $row .= wfMsgHtml( 'filehist-current' );
1037                 } elseif ( $local && $wgUser->isLoggedIn() && $this->title->userCan( 'edit' ) ) {
1038                         if ( $file->isDeleted( File::DELETED_FILE ) ) {
1039                                 $row .= wfMsgHtml( 'filehist-revert' );
1040                         } else {
1041                                 $row .= $this->skin->link(
1042                                         $this->title,
1043                                         wfMsgHtml( 'filehist-revert' ),
1044                                         array(),
1045                                         array(
1046                                                 'action' => 'revert',
1047                                                 'oldimage' => $img,
1048                                                 'wpEditToken' => $wgUser->editToken( $img )
1049                                         ),
1050                                         array( 'known', 'noclasses' )
1051                                 );
1052                         }
1053                 }
1054                 $row .= '</td>';
1055
1056                 // Date/time and image link
1057                 if ( $file->getTimestamp() === $this->img->getTimestamp() ) {
1058                         $selected = "class='filehistory-selected'";
1059                 }
1060                 $row .= "<td $selected style='white-space: nowrap;'>";
1061                 if ( !$file->userCan( File::DELETED_FILE ) ) {
1062                         # Don't link to unviewable files
1063                         $row .= '<span class="history-deleted">' . $wgLang->timeAndDate( $timestamp, true ) . '</span>';
1064                 } elseif ( $file->isDeleted( File::DELETED_FILE ) ) {
1065                         if ( $local ) {
1066                                 $this->preventClickjacking();
1067                                 $revdel = SpecialPage::getTitleFor( 'Revisiondelete' );
1068                                 # Make a link to review the image
1069                                 $url = $this->skin->link(
1070                                         $revdel,
1071                                         $wgLang->timeAndDate( $timestamp, true ),
1072                                         array(),
1073                                         array(
1074                                                 'target' => $this->title->getPrefixedText(),
1075                                                 'file' => $img,
1076                                                 'token' => $wgUser->editToken( $img )
1077                                         ),
1078                                         array( 'known', 'noclasses' )
1079                                 );
1080                         } else {
1081                                 $url = $wgLang->timeAndDate( $timestamp, true );
1082                         }
1083                         $row .= '<span class="history-deleted">' . $url . '</span>';
1084                 } else {
1085                         $url = $iscur ? $this->current->getUrl() : $this->current->getArchiveUrl( $img );
1086                         $row .= Xml::element( 'a', array( 'href' => $url ), $wgLang->timeAndDate( $timestamp, true ) );
1087                 }
1088                 $row .= "</td>";
1089
1090                 // Thumbnail
1091                 if ( $this->showThumb ) {
1092                         $row .= '<td>' . $this->getThumbForLine( $file ) . '</td>';
1093                 }
1094
1095                 // Image dimensions + size
1096                 $row .= '<td>';
1097                 $row .= htmlspecialchars( $file->getDimensionsString() );
1098                 $row .= ' <span style="white-space: nowrap;">(' . $this->skin->formatSize( $file->getSize() ) . ')</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">' . wfMsgHtml( 'rev-deleted-user' ) . '</span>';
1106                 } else {
1107                         if ( $local ) {
1108                                 $row .= $this->skin->userLink( $user, $usertext ) . ' <span style="white-space: nowrap;">' .
1109                                 $this->skin->userToolLinks( $user, $usertext ) . '</span>';
1110                         } else {
1111                                 $row .= htmlspecialchars( $usertext );
1112                         }
1113                 }
1114                 $row .= '</td><td>';
1115
1116                 // Don't show deleted descriptions
1117                 if ( $file->isDeleted( File::DELETED_COMMENT ) ) {
1118                         $row .= '<span class="history-deleted">' . wfMsgHtml( 'rev-deleted-comment' ) . '</span>';
1119                 } else {
1120                         $row .= $this->skin->commentBlock( $description, $this->title );
1121                 }
1122                 $row .= '</td>';
1123
1124                 $rowClass = null;
1125                 wfRunHooks( 'ImagePageFileHistoryLine', array( $this, $file, &$row, &$rowClass ) );
1126                 $classAttr = $rowClass ? " class='$rowClass'" : '';
1127
1128                 return "<tr{$classAttr}>{$row}</tr>\n";
1129         }
1130
1131         /**
1132          * @param $file File
1133          * @return string
1134          */
1135         protected function getThumbForLine( $file ) {
1136                 global $wgLang;
1137
1138                 if ( $file->allowInlineDisplay() && $file->userCan( File::DELETED_FILE ) && !$file->isDeleted( File::DELETED_FILE ) ) {
1139                         $params = array(
1140                                 'width' => '120',
1141                                 'height' => '120',
1142                         );
1143                         $timestamp = wfTimestamp( TS_MW, $file->getTimestamp() );
1144
1145                         $thumbnail = $file->transform( $params );
1146                         $options = array(
1147                                 'alt' => wfMsg( 'filehist-thumbtext',
1148                                         $wgLang->timeAndDate( $timestamp, true ),
1149                                         $wgLang->date( $timestamp, true ),
1150                                         $wgLang->time( $timestamp, true ) ),
1151                                 'file-link' => true,
1152                         );
1153
1154                         if ( !$thumbnail ) {
1155                                 return wfMsgHtml( 'filehist-nothumb' );
1156                         }
1157
1158                         return $thumbnail->toHtml( $options );
1159                 } else {
1160                         return wfMsgHtml( 'filehist-nothumb' );
1161                 }
1162         }
1163
1164         protected function preventClickjacking( $enable = true ) {
1165                 $this->preventClickjacking = $enable;
1166         }
1167
1168         public function getPreventClickjacking() {
1169                 return $this->preventClickjacking;
1170         }
1171 }
1172
1173 class ImageHistoryPseudoPager extends ReverseChronologicalPager {
1174         protected $preventClickjacking = false;
1175
1176         /**
1177          * @var File
1178          */
1179         protected $mImg;
1180
1181         /**
1182          * @var Title
1183          */
1184         protected $mTitle;
1185
1186         /**
1187          * @param ImagePage $imagePage
1188          */
1189         function __construct( $imagePage ) {
1190                 parent::__construct();
1191                 $this->mImagePage = $imagePage;
1192                 $this->mTitle = clone ( $imagePage->getTitle() );
1193                 $this->mTitle->setFragment( '#filehistory' );
1194                 $this->mImg = null;
1195                 $this->mHist = array();
1196                 $this->mRange = array( 0, 0 ); // display range
1197         }
1198
1199         function getTitle() {
1200                 return $this->mTitle;
1201         }
1202
1203         function getQueryInfo() {
1204                 return false;
1205         }
1206
1207         function getIndexField() {
1208                 return '';
1209         }
1210
1211         function formatRow( $row ) {
1212                 return '';
1213         }
1214
1215         function getBody() {
1216                 $s = '';
1217                 $this->doQuery();
1218                 if ( count( $this->mHist ) ) {
1219                         $list = new ImageHistoryList( $this->mImagePage );
1220                         # Generate prev/next links
1221                         $navLink = $this->getNavigationBar();
1222                         $s = $list->beginImageHistoryList( $navLink );
1223                         // Skip rows there just for paging links
1224                         for ( $i = $this->mRange[0]; $i <= $this->mRange[1]; $i++ ) {
1225                                 $file = $this->mHist[$i];
1226                                 $s .= $list->imageHistoryLine( !$file->isOld(), $file );
1227                         }
1228                         $s .= $list->endImageHistoryList( $navLink );
1229
1230                         if ( $list->getPreventClickjacking() ) {
1231                                 $this->preventClickjacking();
1232                         }
1233                 }
1234                 return $s;
1235         }
1236
1237         function doQuery() {
1238                 if ( $this->mQueryDone ) {
1239                         return;
1240                 }
1241                 $this->mImg = $this->mImagePage->getFile(); // ensure loading
1242                 if ( !$this->mImg->exists() ) {
1243                         return;
1244                 }
1245                 $queryLimit = $this->mLimit + 1; // limit plus extra row
1246                 if ( $this->mIsBackwards ) {
1247                         // Fetch the file history
1248                         $this->mHist = $this->mImg->getHistory( $queryLimit, null, $this->mOffset, false );
1249                         // The current rev may not meet the offset/limit
1250                         $numRows = count( $this->mHist );
1251                         if ( $numRows <= $this->mLimit && $this->mImg->getTimestamp() > $this->mOffset ) {
1252                                 $this->mHist = array_merge( array( $this->mImg ), $this->mHist );
1253                         }
1254                 } else {
1255                         // The current rev may not meet the offset
1256                         if ( !$this->mOffset || $this->mImg->getTimestamp() < $this->mOffset ) {
1257                                 $this->mHist[] = $this->mImg;
1258                         }
1259                         // Old image versions (fetch extra row for nav links)
1260                         $oiLimit = count( $this->mHist ) ? $this->mLimit : $this->mLimit + 1;
1261                         // Fetch the file history
1262                         $this->mHist = array_merge( $this->mHist,
1263                                 $this->mImg->getHistory( $oiLimit, $this->mOffset, null, false ) );
1264                 }
1265                 $numRows = count( $this->mHist ); // Total number of query results
1266                 if ( $numRows ) {
1267                         # Index value of top item in the list
1268                         $firstIndex = $this->mIsBackwards ?
1269                                 $this->mHist[$numRows - 1]->getTimestamp() : $this->mHist[0]->getTimestamp();
1270                         # Discard the extra result row if there is one
1271                         if ( $numRows > $this->mLimit && $numRows > 1 ) {
1272                                 if ( $this->mIsBackwards ) {
1273                                         # Index value of item past the index
1274                                         $this->mPastTheEndIndex = $this->mHist[0]->getTimestamp();
1275                                         # Index value of bottom item in the list
1276                                         $lastIndex = $this->mHist[1]->getTimestamp();
1277                                         # Display range
1278                                         $this->mRange = array( 1, $numRows - 1 );
1279                                 } else {
1280                                         # Index value of item past the index
1281                                         $this->mPastTheEndIndex = $this->mHist[$numRows - 1]->getTimestamp();
1282                                         # Index value of bottom item in the list
1283                                         $lastIndex = $this->mHist[$numRows - 2]->getTimestamp();
1284                                         # Display range
1285                                         $this->mRange = array( 0, $numRows - 2 );
1286                                 }
1287                         } else {
1288                                 # Setting indexes to an empty string means that they will be
1289                                 # omitted if they would otherwise appear in URLs. It just so
1290                                 # happens that this  is the right thing to do in the standard
1291                                 # UI, in all the relevant cases.
1292                                 $this->mPastTheEndIndex = '';
1293                                 # Index value of bottom item in the list
1294                                 $lastIndex = $this->mIsBackwards ?
1295                                         $this->mHist[0]->getTimestamp() : $this->mHist[$numRows - 1]->getTimestamp();
1296                                 # Display range
1297                                 $this->mRange = array( 0, $numRows - 1 );
1298                         }
1299                 } else {
1300                         $firstIndex = '';
1301                         $lastIndex = '';
1302                         $this->mPastTheEndIndex = '';
1303                 }
1304                 if ( $this->mIsBackwards ) {
1305                         $this->mIsFirst = ( $numRows < $queryLimit );
1306                         $this->mIsLast = ( $this->mOffset == '' );
1307                         $this->mLastShown = $firstIndex;
1308                         $this->mFirstShown = $lastIndex;
1309                 } else {
1310                         $this->mIsFirst = ( $this->mOffset == '' );
1311                         $this->mIsLast = ( $numRows < $queryLimit );
1312                         $this->mLastShown = $lastIndex;
1313                         $this->mFirstShown = $firstIndex;
1314                 }
1315                 $this->mQueryDone = true;
1316         }
1317
1318         protected function preventClickjacking( $enable = true ) {
1319                 $this->preventClickjacking = $enable;
1320         }
1321
1322         public function getPreventClickjacking() {
1323                 return $this->preventClickjacking;
1324         }
1325
1326 }