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         /**
  16          * @var FileRepo
  17          */
  18         private $repo;
  19         private $fileLoaded;
  20
  21         var $mExtraDescription = false;
  22         var $dupes;
  23
  24         function __construct( $title ) {
  25                 parent::__construct( $title );
  26                 $this->dupes = null;
  27                 $this->repo = null;
  28         }
  29
  30         /**
  31          * @param $file File:
  32          * @return void
  33          */
  34         public function setFile( $file ) {
  35                 $this->displayImg = $file;
  36                 $this->img = $file;
  37                 $this->fileLoaded = true;
  38         }
  39
  40         protected function loadFile() {
  41                 if ( $this->fileLoaded ) {
  42                         return true;
  43                 }
  44                 $this->fileLoaded = true;
  45
  46                 $this->displayImg = $this->img = false;
  47                 wfRunHooks( 'ImagePageFindFile', array( $this, &$this->img, &$this->displayImg ) );
  48                 if ( !$this->img ) {
  49                         $this->img = wfFindFile( $this->mTitle );
  50                         if ( !$this->img ) {
  51                                 $this->img = wfLocalFile( $this->mTitle );
  52                         }
  53                 }
  54                 if ( !$this->displayImg ) {
  55                         $this->displayImg = $this->img;
  56                 }
  57                 $this->repo = $this->img->getRepo();
  58         }
  59
  60         /**
  61          * Handler for action=render
  62          * Include body text only; none of the image extras
  63          */
  64         public function render() {
  65                 global $wgOut;
  66                 $wgOut->setArticleBodyOnly( true );
  67                 parent::view();
  68         }
  69
  70         public function view() {
  71                 global $wgOut, $wgShowEXIF, $wgRequest, $wgUser;
  72
  73                 $diff = $wgRequest->getVal( 'diff' );
  74                 $diffOnly = $wgRequest->getBool( 'diffonly', $wgUser->getOption( 'diffonly' ) );
  75
  76                 if ( $this->mTitle->getNamespace() != NS_FILE || ( isset( $diff ) && $diffOnly ) ) {
  77                         return parent::view();
  78                 }
  79
  80                 $this->loadFile();
  81
  82                 if ( $this->mTitle->getNamespace() == NS_FILE && $this->img->getRedirected() ) {
  83                         if ( $this->mTitle->getDBkey() == $this->img->getName() || isset( $diff ) ) {
  84                                 // mTitle is the same as the redirect target so ask Article
  85                                 // to perform the redirect for us.
  86                                 $wgRequest->setVal( 'diffonly', 'true' );
  87                                 return parent::view();
  88                         } else {
  89                                 // mTitle is not the same as the redirect target so it is
  90                                 // probably the redirect page itself. Fake the redirect symbol
  91                                 $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
  92                                 $wgOut->addHTML( $this->viewRedirect( Title::makeTitle( NS_FILE, $this->img->getName() ),
  93                                         /* $appendSubtitle */ true, /* $forceKnown */ true ) );
  94                                 $this->viewUpdates();
  95                                 return;
  96                         }
  97                 }
  98
  99                 $this->showRedirectedFromHeader();
 100
 101                 if ( $wgShowEXIF && $this->displayImg->exists() ) {
 102                         // @todo FIXME: Bad interface, see note on MediaHandler::formatMetadata().
 103                         $formattedMetadata = $this->displayImg->formatMetadata();
 104                         $showmeta = $formattedMetadata !== false;
 105                 } else {
 106                         $showmeta = false;
 107                 }
 108
 109                 if ( !$diff && $this->displayImg->exists() ) {
 110                         $wgOut->addHTML( $this->showTOC( $showmeta ) );
 111                 }
 112
 113                 if ( !$diff ) {
 114                         $this->openShowImage();
 115                 }
 116
 117                 # No need to display noarticletext, we use our own message, output in openShowImage()
 118                 if ( $this->getID() ) {
 119                         # When $wgBetterDirectionality is enabled, NS_FILE is in the user language,
 120                         # but this section (the actual wikitext) should be in page content language
 121                         $pageLang = $this->mTitle->getPageLanguage();
 122                         $wgOut->addHTML( Xml::openElement( 'div', array( 'id' => 'mw-imagepage-content',
 123                                 'lang' => $pageLang->getCode(), 'dir' => $pageLang->getDir(),
 124                                 'class' => 'mw-content-'.$pageLang->getDir() ) ) );
 125                         parent::view();
 126                         $wgOut->addHTML( Xml::closeElement( 'div' ) );
 127                 } else {
 128                         # Just need to set the right headers
 129                         $wgOut->setArticleFlag( true );
 130                         $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
 131                         $this->viewUpdates();
 132                 }
 133
 134                 # Show shared description, if needed
 135                 if ( $this->mExtraDescription ) {
 136                         $fol = wfMessage( 'shareddescriptionfollows' );
 137                         if ( !$fol->isDisabled() ) {
 138                                 $wgOut->addWikiText( $fol->plain() );
 139                         }
 140                         $wgOut->addHTML( '<div id="shared-image-desc">' . $this->mExtraDescription . "</div>\n" );
 141                 }
 142
 143                 $this->closeShowImage();
 144                 $this->imageHistory();
 145                 // TODO: Cleanup the following
 146
 147                 $wgOut->addHTML( Xml::element( 'h2',
 148                         array( 'id' => 'filelinks' ),
 149                         wfMsg( 'imagelinks' ) ) . "\n" );
 150                 $this->imageDupes();
 151                 # @todo FIXME: For some freaky reason, we can't redirect to foreign images.
 152                 # Yet we return metadata about the target. Definitely an issue in the FileRepo
 153                 $this->imageLinks();
 154
 155                 # Allow extensions to add something after the image links
 156                 $html = '';
 157                 wfRunHooks( 'ImagePageAfterImageLinks', array( $this, &$html ) );
 158                 if ( $html ) {
 159                         $wgOut->addHTML( $html );
 160                 }
 161
 162                 if ( $showmeta ) {
 163                         $wgOut->addHTML( Xml::element( 'h2', array( 'id' => 'metadata' ), wfMsg( 'metadata' ) ) . "\n" );
 164                         $wgOut->addWikiText( $this->makeMetadataTable( $formattedMetadata ) );
 165                         $wgOut->addModules( array( 'mediawiki.action.view.metadata' ) );
 166                 }
 167
 168                 // Add remote Filepage.css
 169                 if( !$this->repo->isLocal() ) {
 170                         $css = $this->repo->getDescriptionStylesheetUrl();
 171                         if ( $css ) {
 172                                 $wgOut->addStyle( $css );
 173                         }
 174                 }
 175                 // always show the local local Filepage.css, bug 29277
 176                 $wgOut->addModuleStyles( 'filepage' );
 177         }
 178
 179         public function getRedirectTarget() {
 180                 $this->loadFile();
 181                 if ( $this->img->isLocal() ) {
 182                         return parent::getRedirectTarget();
 183                 }
 184                 // Foreign image page
 185                 $from = $this->img->getRedirected();
 186                 $to = $this->img->getName();
 187                 if ( $from == $to ) {
 188                         return null;
 189                 }
 190                 return $this->mRedirectTarget = Title::makeTitle( NS_FILE, $to );
 191         }
 192
 193         public function followRedirect() {
 194                 $this->loadFile();
 195                 if ( $this->img->isLocal() ) {
 196                         return parent::followRedirect();
 197                 }
 198                 $from = $this->img->getRedirected();
 199                 $to = $this->img->getName();
 200                 if ( $from == $to ) {
 201                         return false;
 202                 }
 203                 return Title::makeTitle( NS_FILE, $to );
 204         }
 205
 206         public function isRedirect( $text = false ) {
 207                 $this->loadFile();
 208                 if ( $this->img->isLocal() ) {
 209                         return parent::isRedirect( $text );
 210                 }
 211
 212                 return (bool)$this->img->getRedirected();
 213         }
 214
 215         public function isLocal() {
 216                 $this->loadFile();
 217                 return $this->img->isLocal();
 218         }
 219
 220         public function getFile() {
 221                 $this->loadFile();
 222                 return $this->img;
 223         }
 224
 225         public function getDisplayedFile() {
 226                 $this->loadFile();
 227                 return $this->displayImg;
 228         }
 229
 230         public function getDuplicates() {
 231                 $this->loadFile();
 232                 if ( !is_null( $this->dupes ) ) {
 233                         return $this->dupes;
 234                 }
 235                 $hash = $this->img->getSha1();
 236                 if ( !( $hash ) ) {
 237                         return $this->dupes = array();
 238                 }
 239                 $dupes = RepoGroup::singleton()->findBySha1( $hash );
 240                 // Remove duplicates with self and non matching file sizes
 241                 $self = $this->img->getRepoName() . ':' . $this->img->getName();
 242                 $size = $this->img->getSize();
 243                 foreach ( $dupes as $index => $file ) {
 244                         $key = $file->getRepoName() . ':' . $file->getName();
 245                         if ( $key == $self ) {
 246                                 unset( $dupes[$index] );
 247                         }
 248                         if ( $file->getSize() != $size ) {
 249                                 unset( $dupes[$index] );
 250                         }
 251                 }
 252                 return $this->dupes = $dupes;
 253         }
 254
 255         /**
 256          * Create the TOC
 257          *
 258          * @param $metadata Boolean: whether or not to show the metadata link
 259          * @return String
 260          */
 261         protected function showTOC( $metadata ) {
 262                 $r = array(
 263                         '<li><a href="#file">' . wfMsgHtml( 'file-anchor-link' ) . '</a></li>',
 264                         '<li><a href="#filehistory">' . wfMsgHtml( 'filehist' ) . '</a></li>',
 265                         '<li><a href="#filelinks">' . wfMsgHtml( 'imagelinks' ) . '</a></li>',
 266                 );
 267                 if ( $metadata ) {
 268                         $r[] = '<li><a href="#metadata">' . wfMsgHtml( 'metadata' ) . '</a></li>';
 269                 }
 270
 271                 wfRunHooks( 'ImagePageShowTOC', array( $this, &$r ) );
 272
 273                 return '<ul id="filetoc">' . implode( "\n", $r ) . '</ul>';
 274         }
 275
 276         /**
 277          * Make a table with metadata to be shown in the output page.
 278          *
 279          * @todo FIXME: Bad interface, see note on MediaHandler::formatMetadata().
 280          *
 281          * @param $metadata Array: the array containing the EXIF data
 282          * @return String The metadata table. This is treated as Wikitext (!)
 283          */
 284         protected function makeMetadataTable( $metadata ) {
 285                 $r = "<div class=\"mw-imagepage-section-metadata\">";
 286                 $r .= wfMsgNoTrans( 'metadata-help' );
 287                 $r .= "<table id=\"mw_metadata\" class=\"mw_metadata\">\n";
 288                 foreach ( $metadata as $type => $stuff ) {
 289                         foreach ( $stuff as $v ) {
 290                                 # @todo FIXME: Why is this using escapeId for a class?!
 291                                 $class = Sanitizer::escapeId( $v['id'] );
 292                                 if ( $type == 'collapsed' ) {
 293                                         $class .= ' collapsable';
 294                                 }
 295                                 $r .= "<tr class=\"$class\">\n";
 296                                 $r .= "<th>{$v['name']}</th>\n";
 297                                 $r .= "<td>{$v['value']}</td>\n</tr>";
 298                         }
 299                 }
 300                 $r .= "</table>\n</div>\n";
 301                 return $r;
 302         }
 303
 304         /**
 305          * Overloading Article's getContent method.
 306          *
 307          * Omit noarticletext if sharedupload; text will be fetched from the
 308          * shared upload server if possible.
 309          */
 310         public function getContent() {
 311                 $this->loadFile();
 312                 if ( $this->img && !$this->img->isLocal() && 0 == $this->getID() ) {
 313                         return '';
 314                 }
 315                 return parent::getContent();
 316         }
 317
 318         protected function openShowImage() {
 319                 global $wgOut, $wgUser, $wgImageLimits, $wgRequest,
 320                         $wgLang, $wgEnableUploads;
 321
 322                 $this->loadFile();
 323
 324                 $sizeSel = intval( $wgUser->getOption( 'imagesize' ) );
 325                 if ( !isset( $wgImageLimits[$sizeSel] ) ) {
 326                         $sizeSel = User::getDefaultOption( 'imagesize' );
 327
 328                         // The user offset might still be incorrect, specially if
 329                         // $wgImageLimits got changed (see bug #8858).
 330                         if ( !isset( $wgImageLimits[$sizeSel] ) ) {
 331                                 // Default to the first offset in $wgImageLimits
 332                                 $sizeSel = 0;
 333                         }
 334                 }
 335                 $max = $wgImageLimits[$sizeSel];
 336                 $maxWidth = $max[0];
 337                 $maxHeight = $max[1];
 338                 $sk = $wgUser->getSkin();
 339                 $dirmark = wfUILang()->getDirMark();
 340
 341                 if ( $this->displayImg->exists() ) {
 342                         # image
 343                         $page = $wgRequest->getIntOrNull( 'page' );
 344                         if ( is_null( $page ) ) {
 345                                 $params = array();
 346                                 $page = 1;
 347                         } else {
 348                                 $params = array( 'page' => $page );
 349                         }
 350                         $width_orig = $this->displayImg->getWidth( $page );
 351                         $width = $width_orig;
 352                         $height_orig = $this->displayImg->getHeight( $page );
 353                         $height = $height_orig;
 354
 355                         $longDesc = wfMsg( 'parentheses', $this->displayImg->getLongDesc() );
 356
 357                         wfRunHooks( 'ImageOpenShowImageInlineBefore', array( &$this, &$wgOut ) );
 358
 359                         if ( $this->displayImg->allowInlineDisplay() ) {
 360                                 # image
 361
 362                                 # "Download high res version" link below the image
 363                                 # $msgsize = wfMsgHtml( 'file-info-size', $width_orig, $height_orig, $sk->formatSize( $this->displayImg->getSize() ), $mime );
 364                                 # We'll show a thumbnail of this image
 365                                 if ( $width > $maxWidth || $height > $maxHeight ) {
 366                                         # Calculate the thumbnail size.
 367                                         # First case, the limiting factor is the width, not the height.
 368                                         if ( $width / $height >= $maxWidth / $maxHeight ) {
 369                                                 $height = round( $height * $maxWidth / $width );
 370                                                 $width = $maxWidth;
 371                                                 # Note that $height <= $maxHeight now.
 372                                         } else {
 373                                                 $newwidth = floor( $width * $maxHeight / $height );
 374                                                 $height = round( $height * $newwidth / $width );
 375                                                 $width = $newwidth;
 376                                                 # Note that $height <= $maxHeight now, but might not be identical
 377                                                 # because of rounding.
 378                                         }
 379                                         $msgbig  = wfMsgHtml( 'show-big-image' );
 380                                         $otherSizes = array();
 381                                         foreach ( $wgImageLimits as $size ) {
 382                                                 if ( $size[0] < $width_orig && $size[1] < $height_orig &&
 383                                                                 $size[0] != $width && $size[1] != $height ) {
 384                                                         $otherSizes[] = $this->makeSizeLink( $params, $size[0], $size[1] );
 385                                                 }
 386                                         }
 387                                         $msgsmall = wfMessage( 'show-big-image-preview' )->
 388                                                 rawParams( $this->makeSizeLink( $params, $width, $height ) )->
 389                                                 parse() . ' ' .
 390                                                 wfMessage( 'show-big-image-other' )->
 391                                                 rawParams( $wgLang->pipeList( $otherSizes ) )->parse();
 392                                 } else {
 393                                         # Image is small enough to show full size on image page
 394                                         $msgsmall = wfMsgExt( 'file-nohires', array( 'parseinline' ) );
 395                                 }
 396
 397                                 $params['width'] = $width;
 398                                 $params['height'] = $height;
 399                                 $thumbnail = $this->displayImg->transform( $params );
 400
 401                                 $showLink = true;
 402                                 $anchorclose = '<br />' . $msgsmall;
 403
 404                                 $isMulti = $this->displayImg->isMultipage() && $this->displayImg->pageCount() > 1;
 405                                 if ( $isMulti ) {
 406                                         $wgOut->addHTML( '<table class="multipageimage"><tr><td>' );
 407                                 }
 408
 409                                 if ( $thumbnail ) {
 410                                         $options = array(
 411                                                 'alt' => $this->displayImg->getTitle()->getPrefixedText(),
 412                                                 'file-link' => true,
 413                                         );
 414                                         $wgOut->addHTML( '<div class="fullImageLink" id="file">' .
 415                                                 $thumbnail->toHtml( $options ) .
 416                                                 $anchorclose . "</div>\n" );
 417                                 }
 418
 419                                 if ( $isMulti ) {
 420                                         $count = $this->displayImg->pageCount();
 421
 422                                         if ( $page > 1 ) {
 423                                                 $label = $wgOut->parse( wfMsg( 'imgmultipageprev' ), false );
 424                                                 $link = $sk->link(
 425                                                         $this->mTitle,
 426                                                         $label,
 427                                                         array(),
 428                                                         array( 'page' => $page - 1 ),
 429                                                         array( 'known', 'noclasses' )
 430                                                 );
 431                                                 $thumb1 = $sk->makeThumbLinkObj( $this->mTitle, $this->displayImg, $link, $label, 'none',
 432                                                         array( 'page' => $page - 1 ) );
 433                                         } else {
 434                                                 $thumb1 = '';
 435                                         }
 436
 437                                         if ( $page < $count ) {
 438                                                 $label = wfMsg( 'imgmultipagenext' );
 439                                                 $link = $sk->link(
 440                                                         $this->mTitle,
 441                                                         $label,
 442                                                         array(),
 443                                                         array( 'page' => $page + 1 ),
 444                                                         array( 'known', 'noclasses' )
 445                                                 );
 446                                                 $thumb2 = $sk->makeThumbLinkObj( $this->mTitle, $this->displayImg, $link, $label, 'none',
 447                                                         array( 'page' => $page + 1 ) );
 448                                         } else {
 449                                                 $thumb2 = '';
 450                                         }
 451
 452                                         global $wgScript;
 453
 454                                         $formParams = array(
 455                                                 'name' => 'pageselector',
 456                                                 'action' => $wgScript,
 457                                                 'onchange' => 'document.pageselector.submit();',
 458                                         );
 459
 460                                         for ( $i = 1; $i <= $count; $i++ ) {
 461                                                 $options[] = Xml::option( $wgLang->formatNum( $i ), $i, $i == $page );
 462                                         }
 463                                         $select = Xml::tags( 'select',
 464                                                 array( 'id' => 'pageselector', 'name' => 'page' ),
 465                                                 implode( "\n", $options ) );
 466
 467                                         $wgOut->addHTML(
 468                                                 '</td><td><div class="multipageimagenavbox">' .
 469                                                 Xml::openElement( 'form', $formParams ) .
 470                                                 Html::hidden( 'title', $this->getTitle()->getPrefixedDBkey() ) .
 471                                                 wfMsgExt( 'imgmultigoto', array( 'parseinline', 'replaceafter' ), $select ) .
 472                                                 Xml::submitButton( wfMsg( 'imgmultigo' ) ) .
 473                                                 Xml::closeElement( 'form' ) .
 474                                                 "<hr />$thumb1\n$thumb2<br clear=\"all\" /></div></td></tr></table>"
 475                                         );
 476                                 }
 477                         } else {
 478                                 # if direct link is allowed but it's not a renderable image, show an icon.
 479                                 if ( $this->displayImg->isSafeFile() ) {
 480                                         $icon = $this->displayImg->iconThumb();
 481
 482                                         $wgOut->addHTML( '<div class="fullImageLink" id="file">' .
 483                                                 $icon->toHtml( array( 'file-link' => true ) ) .
 484                                                 "</div>\n" );
 485                                 }
 486
 487                                 $showLink = true;
 488                         }
 489
 490                         if ( $showLink ) {
 491                                 $filename = wfEscapeWikiText( $this->displayImg->getName() );
 492                                 $linktext = $filename;
 493                                 if ( isset( $msgbig ) ) {
 494                                         $linktext = wfEscapeWikiText( $msgbig );
 495                                 }
 496                                 $medialink = "[[Media:$filename|$linktext]]";
 497
 498                                 if ( !$this->displayImg->isSafeFile() ) {
 499                                         $warning = wfMsgNoTrans( 'mediawarning' );
 500                                         $wgOut->addWikiText( <<<EOT
 501 <div class="fullMedia"><span class="dangerousLink">{$medialink}</span>$dirmark <span class="fileInfo">$longDesc</span></div>
 502 <div class="mediaWarning">$warning</div>
 503 EOT
 504                                                 );
 505                                 } else {
 506                                         $wgOut->addWikiText( <<<EOT
 507 <div class="fullMedia">{$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 ( $wgEnableUploads && $wgUser->isAllowed( 'upload' ) ) {
 520                                 // Only show an upload link if the user can upload
 521                                 $uploadTitle = SpecialPage::getTitleFor( 'Upload' );
 522                                 $nofile = array(
 523                                         'filepage-nofile-link',
 524                                         $uploadTitle->getFullURL( array( 'wpDestFile' => $this->img->getName() ) )
 525                                 );
 526                         } else {
 527                                 $nofile = 'filepage-nofile';
 528                         }
 529                         // Note, if there is an image description page, but
 530                         // no image, then this setRobotPolicy is overriden
 531                         // by Article::View().
 532                         $wgOut->setRobotPolicy( 'noindex,nofollow' );
 533                         $wgOut->wrapWikiMsg( "<div id='mw-imagepage-nofile' class='plainlinks'>\n$1\n</div>", $nofile );
 534                         if ( !$this->getID() ) {
 535                                 // If there is no image, no shared image, and no description page,
 536                                 // output a 404, to be consistent with articles.
 537                                 $wgRequest->response()->header( 'HTTP/1.1 404 Not Found' );
 538                         }
 539                 }
 540         }
 541
 542         /**
 543          * Creates an thumbnail of specified size and returns an HTML link to it
 544          * @param array $params Scaler parameters
 545          * @param int $width
 546          * @param int $height
 547          */
 548         private function makeSizeLink( $params, $width, $height ) {
 549                 $params['width'] = $width;
 550                 $params['height'] = $height;
 551                 $thumbnail = $this->displayImg->transform( $params );
 552                 if ( $thumbnail && !$thumbnail->isError() ) {
 553                         return Html::rawElement( 'a', array(
 554                                 'href' => $thumbnail->getUrl(),
 555                                 'class' => 'mw-thumbnail-link'
 556                                 ), wfMessage( 'show-big-image-size' )->numParams(
 557                                         $thumbnail->getWidth(), $thumbnail->getHeight()
 558                                 )->parse() );
 559                 } else {
 560                         return '';
 561                 }
 562         }
 563
 564         /**
 565          * Show a notice that the file is from a shared repository
 566          */
 567         protected function printSharedImageText() {
 568                 global $wgOut;
 569
 570                 $this->loadFile();
 571
 572                 $descUrl = $this->img->getDescriptionUrl();
 573                 $descText = $this->img->getDescriptionText();
 574
 575                 /* Add canonical to head if there is no local page for this shared file */
 576                 if( $descUrl && $this->getID() == 0 ) {
 577                         $wgOut->addLink( array( 'rel' => 'canonical', 'href' => $descUrl ) );
 578                 }
 579
 580                 $wrap = "<div class=\"sharedUploadNotice\">\n$1\n</div>\n";
 581                 $repo = $this->img->getRepo()->getDisplayName();
 582
 583                 if ( $descUrl && $descText && wfMsgNoTrans( 'sharedupload-desc-here' ) !== '-'  ) {
 584                         $wgOut->wrapWikiMsg( $wrap, array( 'sharedupload-desc-here', $repo, $descUrl ) );
 585                 } elseif ( $descUrl && wfMsgNoTrans( 'sharedupload-desc-there' ) !== '-' ) {
 586                         $wgOut->wrapWikiMsg( $wrap, array( 'sharedupload-desc-there', $repo, $descUrl ) );
 587                 } else {
 588                         $wgOut->wrapWikiMsg( $wrap, array( 'sharedupload', $repo ), ''/*BACKCOMPAT*/ );
 589                 }
 590
 591                 if ( $descText ) {
 592                         $this->mExtraDescription = $descText;
 593                 }
 594         }
 595
 596         public function getUploadUrl() {
 597                 $this->loadFile();
 598                 $uploadTitle = SpecialPage::getTitleFor( 'Upload' );
 599                 return $uploadTitle->getFullURL( array(
 600                         'wpDestFile' => $this->img->getName(),
 601                         'wpForReUpload' => 1
 602                  ) );
 603         }
 604
 605         /**
 606          * Print out the various links at the bottom of the image page, e.g. reupload,
 607          * external editing (and instructions link) etc.
 608          */
 609         protected function uploadLinksBox() {
 610                 global $wgUser, $wgOut, $wgEnableUploads, $wgUseExternalEditor;
 611
 612                 if ( !$wgEnableUploads ) {
 613                         return;
 614                 }
 615
 616                 $this->loadFile();
 617                 if ( !$this->img->isLocal() ) {
 618                         return;
 619                 }
 620
 621                 $sk = $wgUser->getSkin();
 622
 623                 $wgOut->addHTML( "<br /><ul>\n" );
 624
 625                 # "Upload a new version of this file" link
 626                 if ( UploadBase::userCanReUpload( $wgUser, $this->img->name ) ) {
 627                         $ulink = $sk->makeExternalLink( $this->getUploadUrl(), wfMsg( 'uploadnewversion-linktext' ) );
 628                         $wgOut->addHTML( "<li id=\"mw-imagepage-reupload-link\"><div class=\"plainlinks\">{$ulink}</div></li>\n" );
 629                 }
 630
 631                 # External editing link
 632                 if ( $wgUseExternalEditor ) {
 633                         $elink = $sk->link(
 634                                 $this->mTitle,
 635                                 wfMsgHtml( 'edit-externally' ),
 636                                 array(),
 637                                 array(
 638                                         'action' => 'edit',
 639                                         'externaledit' => 'true',
 640                                         'mode' => 'file'
 641                                 ),
 642                                 array( 'known', 'noclasses' )
 643                         );
 644                         $wgOut->addHTML(
 645                                 '<li id="mw-imagepage-edit-external">' . $elink . ' <small>' .
 646                                 wfMsgExt( 'edit-externally-help', array( 'parseinline' ) ) .
 647                                 "</small></li>\n"
 648                         );
 649                 }
 650
 651                 $wgOut->addHTML( "</ul>\n" );
 652         }
 653
 654         protected function closeShowImage() { } # For overloading
 655
 656         /**
 657          * If the page we've just displayed is in the "Image" namespace,
 658          * we follow it with an upload history of the image and its usage.
 659          */
 660         protected function imageHistory() {
 661                 global $wgOut;
 662
 663                 $this->loadFile();
 664                 $pager = new ImageHistoryPseudoPager( $this );
 665                 $wgOut->addHTML( $pager->getBody() );
 666                 $wgOut->preventClickjacking( $pager->getPreventClickjacking() );
 667
 668                 $this->img->resetHistory(); // free db resources
 669
 670                 # Exist check because we don't want to show this on pages where an image
 671                 # doesn't exist along with the noimage message, that would suck. -ævar
 672                 if ( $this->img->exists() ) {
 673                         $this->uploadLinksBox();
 674                 }
 675         }
 676
 677         protected function queryImageLinks( $target, $limit ) {
 678                 $dbr = wfGetDB( DB_SLAVE );
 679
 680                 return $dbr->select(
 681                         array( 'imagelinks', 'page' ),
 682                         array( 'page_namespace', 'page_title', 'page_is_redirect', 'il_to' ),
 683                         array( 'il_to' => $target, 'il_from = page_id' ),
 684                         __METHOD__,
 685                         array( 'LIMIT' => $limit + 1 )
 686                 );
 687         }
 688
 689         protected function imageLinks() {
 690                 global $wgUser, $wgOut, $wgLang;
 691
 692                 $limit = 100;
 693
 694                 $res = $this->queryImageLinks( $this->mTitle->getDbKey(), $limit + 1);
 695                 $rows = array();
 696                 $redirects = array();
 697                 foreach ( $res as $row ) {
 698                         if ( $row->page_is_redirect ) {
 699                                 $redirects[$row->page_title] = array();
 700                         }
 701                         $rows[] = $row;
 702                 }
 703                 $count = count( $rows );
 704
 705                 $hasMore = $count > $limit;
 706                 if ( !$hasMore && count( $redirects ) ) {
 707                         $res = $this->queryImageLinks( array_keys( $redirects ),
 708                                 $limit - count( $rows ) + 1 );
 709                         foreach ( $res as $row ) {
 710                                 $redirects[$row->il_to][] = $row;
 711                                 $count++;
 712                         }
 713                         $hasMore = ( $res->numRows() + count( $rows ) ) > $limit;
 714                 }
 715
 716                 if ( $count == 0 ) {
 717                         $wgOut->wrapWikiMsg(
 718                                 Html::rawElement( 'div',
 719                                         array( 'id' => 'mw-imagepage-nolinkstoimage' ), "\n$1\n" ),
 720                                 'nolinkstoimage'
 721                         );
 722                         return;
 723                 }
 724
 725                 $wgOut->addHTML( "<div id='mw-imagepage-section-linkstoimage'>\n" );
 726                 if ( !$hasMore ) {
 727                         $wgOut->addWikiMsg( 'linkstoimage', $count );
 728                 } else {
 729                         // More links than the limit. Add a link to [[Special:Whatlinkshere]]
 730                         $wgOut->addWikiMsg( 'linkstoimage-more',
 731                                 $wgLang->formatNum( $limit ),
 732                                 $this->mTitle->getPrefixedDBkey()
 733                         );
 734                 }
 735
 736                 $wgOut->addHTML(
 737                         Html::openElement( 'ul',
 738                                 array( 'class' => 'mw-imagepage-linkstoimage' ) ) . "\n"
 739                 );
 740                 $sk = $wgUser->getSkin();
 741                 $count = 0;
 742
 743                 // Sort the list by namespace:title
 744                 usort( $rows, array( $this, 'compare' ) );
 745
 746                 // Create links for every element
 747                 $currentCount = 0;
 748                 foreach( $rows as $element ) {
 749                         $currentCount++;
 750                         if ( $currentCount > $limit ) {
 751                                 break;
 752                         }
 753
 754                         $link = $sk->linkKnown( Title::makeTitle( $element->page_namespace, $element->page_title ) );
 755                         if ( !isset( $redirects[$element->page_title] ) ) {
 756                                 $liContents = $link;
 757                         } else {
 758                                 $ul = "<ul class='mw-imagepage-redirectstofile'>\n";
 759                                 foreach ( $redirects[$element->page_title] as $row ) {
 760                                         $currentCount++;
 761                                         if ( $currentCount > $limit ) {
 762                                                 break;
 763                                         }
 764
 765                                         $link2 = $sk->linkKnown( Title::makeTitle( $row->page_namespace, $row->page_title ) );
 766                                         $ul .= Html::rawElement(
 767                                                 'li',
 768                                                 array( 'id' => 'mw-imagepage-linkstoimage-ns' . $element->page_namespace ),
 769                                                 $link2
 770                                                 ) . "\n";
 771                                 }
 772                                 $ul .= '</ul>';
 773                                 $liContents = wfMessage( 'linkstoimage-redirect' )->rawParams(
 774                                         $link, $ul )->parse();
 775                         }
 776                         $wgOut->addHTML( Html::rawElement(
 777                                         'li',
 778                                         array( 'id' => 'mw-imagepage-linkstoimage-ns' . $element->page_namespace ),
 779                                         $liContents
 780                                 ) . "\n"
 781                         );
 782
 783                 };
 784                 $wgOut->addHTML( Html::closeElement( 'ul' ) . "\n" );
 785                 $res->free();
 786
 787                 // Add a links to [[Special:Whatlinkshere]]
 788                 if ( $count > $limit ) {
 789                         $wgOut->addWikiMsg( 'morelinkstoimage', $this->mTitle->getPrefixedDBkey() );
 790                 }
 791                 $wgOut->addHTML( Html::closeElement( 'div' ) . "\n" );
 792         }
 793
 794         protected function imageDupes() {
 795                 global $wgOut, $wgUser, $wgLang;
 796
 797                 $this->loadFile();
 798
 799                 $dupes = $this->getDuplicates();
 800                 if ( count( $dupes ) == 0 ) {
 801                         return;
 802                 }
 803
 804                 $wgOut->addHTML( "<div id='mw-imagepage-section-duplicates'>\n" );
 805                 $wgOut->addWikiMsg( 'duplicatesoffile',
 806                         $wgLang->formatNum( count( $dupes ) ), $this->mTitle->getDBkey()
 807                 );
 808                 $wgOut->addHTML( "<ul class='mw-imagepage-duplicates'>\n" );
 809
 810                 $sk = $wgUser->getSkin();
 811                 foreach ( $dupes as $file ) {
 812                         $fromSrc = '';
 813                         if ( $file->isLocal() ) {
 814                                 $link = $sk->link(
 815                                         $file->getTitle(),
 816                                         null,
 817                                         array(),
 818                                         array(),
 819                                         array( 'known', 'noclasses' )
 820                                 );
 821                         } else {
 822                                 $link = $sk->makeExternalLink( $file->getDescriptionUrl(),
 823                                         $file->getTitle()->getPrefixedText() );
 824                                 $fromSrc = wfMsg( 'shared-repo-from', $file->getRepo()->getDisplayName() );
 825                         }
 826                         $wgOut->addHTML( "<li>{$link} {$fromSrc}</li>\n" );
 827                 }
 828                 $wgOut->addHTML( "</ul></div>\n" );
 829         }
 830
 831         /**
 832          * Delete the file, or an earlier version of it
 833          */
 834         public function delete() {
 835                 global $wgUploadMaintenance;
 836                 if ( $wgUploadMaintenance && $this->mTitle && $this->mTitle->getNamespace() == NS_FILE ) {
 837                         global $wgOut;
 838                         $wgOut->wrapWikiMsg( "<div class='error'>\n$1\n</div>\n", array( 'filedelete-maintenance' ) );
 839                         return;
 840                 }
 841
 842                 $this->loadFile();
 843                 if ( !$this->img->exists() || !$this->img->isLocal() || $this->img->getRedirected() ) {
 844                         // Standard article deletion
 845                         parent::delete();
 846                         return;
 847                 }
 848                 $deleter = new FileDeleteForm( $this->img );
 849                 $deleter->execute();
 850         }
 851
 852         /**
 853          * Revert the file to an earlier version
 854          */
 855         public function revert() {
 856                 $this->loadFile();
 857                 $reverter = new FileRevertForm( $this->img );
 858                 $reverter->execute();
 859         }
 860
 861         /**
 862          * Override handling of action=purge
 863          */
 864         public function doPurge() {
 865                 $this->loadFile();
 866                 if ( $this->img->exists() ) {
 867                         wfDebug( 'ImagePage::doPurge purging ' . $this->img->getName() . "\n" );
 868                         $update = new HTMLCacheUpdate( $this->mTitle, 'imagelinks' );
 869                         $update->doUpdate();
 870                         $this->img->upgradeRow();
 871                         $this->img->purgeCache();
 872                 } else {
 873                         wfDebug( 'ImagePage::doPurge no image for ' . $this->img->getName() . "; limiting purge to cache only\n" );
 874                         // even if the file supposedly doesn't exist, force any cached information
 875                         // to be updated (in case the cached information is wrong)
 876                         $this->img->purgeCache();
 877                 }
 878                 parent::doPurge();
 879         }
 880
 881         /**
 882          * Display an error with a wikitext description
 883          */
 884         function showError( $description ) {
 885                 global $wgOut;
 886                 $wgOut->setPageTitle( wfMsg( 'internalerror' ) );
 887                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
 888                 $wgOut->setArticleRelated( false );
 889                 $wgOut->enableClientCache( false );
 890                 $wgOut->addWikiText( $description );
 891         }
 892
 893         /**
 894          * Callback for usort() to do link sorts by (namespace, title)
 895          * Function copied from Title::compare()
 896          *
 897          * @param $a object page to compare with
 898          * @param $b object page to compare with
 899          * @return Integer: result of string comparison, or namespace comparison
 900          */
 901         protected function compare( $a, $b ) {
 902                 if ( $a->page_namespace == $b->page_namespace ) {
 903                         return strcmp( $a->page_title, $b->page_title );
 904                 } else {
 905                         return $a->page_namespace - $b->page_namespace;
 906                 }
 907         }
 908 }
 909
 910 /**
 911  * Builds the image revision log shown on image pages
 912  *
 913  * @ingroup Media
 914  */
 915 class ImageHistoryList {
 916
 917         /**
 918          * @var Title
 919          */
 920         protected $title;
 921
 922         /**
 923          * @var File
 924          */
 925         protected $img;
 926
 927         /**
 928          * @var ImagePage
 929          */
 930         protected $imagePage;
 931
 932         /**
 933          * @var Skin
 934          */
 935         protected $skin;
 936
 937         protected $repo, $showThumb;
 938         protected $preventClickjacking = false;
 939
 940         /**
 941          * @param ImagePage $imagePage
 942          */
 943         public function __construct( $imagePage ) {
 944                 global $wgUser, $wgShowArchiveThumbnails;
 945                 $this->skin = $wgUser->getSkin();
 946                 $this->current = $imagePage->getFile();
 947                 $this->img = $imagePage->getDisplayedFile();
 948                 $this->title = $imagePage->getTitle();
 949                 $this->imagePage = $imagePage;
 950                 $this->showThumb = $wgShowArchiveThumbnails && $this->img->canRender();
 951         }
 952
 953         public function getImagePage() {
 954                 return $this->imagePage;
 955         }
 956
 957         public function getSkin() {
 958                 return $this->skin;
 959         }
 960
 961         public function getFile() {
 962                 return $this->img;
 963         }
 964
 965         public function beginImageHistoryList( $navLinks = '' ) {
 966                 global $wgOut, $wgUser;
 967                 return Xml::element( 'h2', array( 'id' => 'filehistory' ), wfMsg( 'filehist' ) ) . "\n"
 968                         . "<div id=\"mw-imagepage-section-filehistory\">\n"
 969                         . $wgOut->parse( wfMsgNoTrans( 'filehist-help' ) )
 970                         . $navLinks . "\n"
 971                         . Xml::openElement( 'table', array( 'class' => 'wikitable filehistory' ) ) . "\n"
 972                         . '<tr><td></td>'
 973                         . ( $this->current->isLocal() && ( $wgUser->isAllowedAny( 'delete', 'deletedhistory' ) ) ? '<td></td>' : '' )
 974                         . '<th>' . wfMsgHtml( 'filehist-datetime' ) . '</th>'
 975                         . ( $this->showThumb ? '<th>' . wfMsgHtml( 'filehist-thumb' ) . '</th>' : '' )
 976                         . '<th>' . wfMsgHtml( 'filehist-dimensions' ) . '</th>'
 977                         . '<th>' . wfMsgHtml( 'filehist-user' ) . '</th>'
 978                         . '<th>' . wfMsgHtml( 'filehist-comment' ) . '</th>'
 979                         . "</tr>\n";
 980         }
 981
 982         public function endImageHistoryList( $navLinks = '' ) {
 983                 return "</table>\n$navLinks\n</div>\n";
 984         }
 985
 986         /**
 987          * @param $iscur
 988          * @param $file File
 989          * @return string
 990          */
 991         public function imageHistoryLine( $iscur, $file ) {
 992                 global $wgUser, $wgLang;
 993
 994                 $timestamp = wfTimestamp( TS_MW, $file->getTimestamp() );
 995                 $img = $iscur ? $file->getName() : $file->getArchiveName();
 996                 $user = $file->getUser( 'id' );
 997                 $usertext = $file->getUser( 'text' );
 998                 $description = $file->getDescription();
 999
1000                 $local = $this->current->isLocal();
1001                 $row = $selected = '';
1002
1003                 // Deletion link
1004                 if ( $local && ( $wgUser->isAllowedAny( 'delete', 'deletedhistory' ) ) ) {
1005                         $row .= '<td>';
1006                         # Link to remove from history
1007                         if ( $wgUser->isAllowed( 'delete' ) ) {
1008                                 $q = array( 'action' => 'delete' );
1009                                 if ( !$iscur ) {
1010                                         $q['oldimage'] = $img;
1011                                 }
1012                                 $row .= $this->skin->link(
1013                                         $this->title,
1014                                         wfMsgHtml( $iscur ? 'filehist-deleteall' : 'filehist-deleteone' ),
1015                                         array(), $q, array( 'known' )
1016                                 );
1017                         }
1018                         # Link to hide content. Don't show useless link to people who cannot hide revisions.
1019                         $canHide = $wgUser->isAllowed( 'deleterevision' );
1020                         if ( $canHide || ( $wgUser->isAllowed( 'deletedhistory' ) && $file->getVisibility() ) ) {
1021                                 if ( $wgUser->isAllowed( 'delete' ) ) {
1022                                         $row .= '<br />';
1023                                 }
1024                                 // If file is top revision or locked from this user, don't link
1025                                 if ( $iscur || !$file->userCan( File::DELETED_RESTRICTED ) ) {
1026                                         $del = $this->skin->revDeleteLinkDisabled( $canHide );
1027                                 } else {
1028                                         list( $ts, $name ) = explode( '!', $img, 2 );
1029                                         $query = array(
1030                                                 'type'   => 'oldimage',
1031                                                 'target' => $this->title->getPrefixedText(),
1032                                                 'ids'    => $ts,
1033                                         );
1034                                         $del = $this->skin->revDeleteLink( $query,
1035                                                 $file->isDeleted( File::DELETED_RESTRICTED ), $canHide );
1036                                 }
1037                                 $row .= $del;
1038                         }
1039                         $row .= '</td>';
1040                 }
1041
1042                 // Reversion link/current indicator
1043                 $row .= '<td>';
1044                 if ( $iscur ) {
1045                         $row .= wfMsgHtml( 'filehist-current' );
1046                 } elseif ( $local && $wgUser->isLoggedIn() && $this->title->userCan( 'edit' ) ) {
1047                         if ( $file->isDeleted( File::DELETED_FILE ) ) {
1048                                 $row .= wfMsgHtml( 'filehist-revert' );
1049                         } else {
1050                                 $row .= $this->skin->link(
1051                                         $this->title,
1052                                         wfMsgHtml( 'filehist-revert' ),
1053                                         array(),
1054                                         array(
1055                                                 'action' => 'revert',
1056                                                 'oldimage' => $img,
1057                                                 'wpEditToken' => $wgUser->editToken( $img )
1058                                         ),
1059                                         array( 'known', 'noclasses' )
1060                                 );
1061                         }
1062                 }
1063                 $row .= '</td>';
1064
1065                 // Date/time and image link
1066                 if ( $file->getTimestamp() === $this->img->getTimestamp() ) {
1067                         $selected = "class='filehistory-selected'";
1068                 }
1069                 $row .= "<td $selected style='white-space: nowrap;'>";
1070                 if ( !$file->userCan( File::DELETED_FILE ) ) {
1071                         # Don't link to unviewable files
1072                         $row .= '<span class="history-deleted">' . $wgLang->timeAndDate( $timestamp, true ) . '</span>';
1073                 } elseif ( $file->isDeleted( File::DELETED_FILE ) ) {
1074                         if ( $local ) {
1075                                 $this->preventClickjacking();
1076                                 $revdel = SpecialPage::getTitleFor( 'Revisiondelete' );
1077                                 # Make a link to review the image
1078                                 $url = $this->skin->link(
1079                                         $revdel,
1080                                         $wgLang->timeAndDate( $timestamp, true ),
1081                                         array(),
1082                                         array(
1083                                                 'target' => $this->title->getPrefixedText(),
1084                                                 'file' => $img,
1085                                                 'token' => $wgUser->editToken( $img )
1086                                         ),
1087                                         array( 'known', 'noclasses' )
1088                                 );
1089                         } else {
1090                                 $url = $wgLang->timeAndDate( $timestamp, true );
1091                         }
1092                         $row .= '<span class="history-deleted">' . $url . '</span>';
1093                 } else {
1094                         $url = $iscur ? $this->current->getUrl() : $this->current->getArchiveUrl( $img );
1095                         $row .= Xml::element( 'a', array( 'href' => $url ), $wgLang->timeAndDate( $timestamp, true ) );
1096                 }
1097                 $row .= "</td>";
1098
1099                 // Thumbnail
1100                 if ( $this->showThumb ) {
1101                         $row .= '<td>' . $this->getThumbForLine( $file ) . '</td>';
1102                 }
1103
1104                 // Image dimensions + size
1105                 $row .= '<td>';
1106                 $row .= htmlspecialchars( $file->getDimensionsString() );
1107                 $row .= ' <span style="white-space: nowrap;">(' . $this->skin->formatSize( $file->getSize() ) . ')</span>';
1108                 $row .= '</td>';
1109
1110                 // Uploading user
1111                 $row .= '<td>';
1112                 // Hide deleted usernames
1113                 if ( $file->isDeleted( File::DELETED_USER ) ) {
1114                         $row .= '<span class="history-deleted">' . wfMsgHtml( 'rev-deleted-user' ) . '</span>';
1115                 } else {
1116                         if ( $local ) {
1117                                 $row .= $this->skin->userLink( $user, $usertext ) . ' <span style="white-space: nowrap;">' .
1118                                 $this->skin->userToolLinks( $user, $usertext ) . '</span>';
1119                         } else {
1120                                 $row .= htmlspecialchars( $usertext );
1121                         }
1122                 }
1123                 $row .= '</td><td>';
1124
1125                 // Don't show deleted descriptions
1126                 if ( $file->isDeleted( File::DELETED_COMMENT ) ) {
1127                         $row .= '<span class="history-deleted">' . wfMsgHtml( 'rev-deleted-comment' ) . '</span>';
1128                 } else {
1129                         $row .= $this->skin->commentBlock( $description, $this->title );
1130                 }
1131                 $row .= '</td>';
1132
1133                 $rowClass = null;
1134                 wfRunHooks( 'ImagePageFileHistoryLine', array( $this, $file, &$row, &$rowClass ) );
1135                 $classAttr = $rowClass ? " class='$rowClass'" : '';
1136
1137                 return "<tr{$classAttr}>{$row}</tr>\n";
1138         }
1139
1140         /**
1141          * @param $file File
1142          * @return string
1143          */
1144         protected function getThumbForLine( $file ) {
1145                 global $wgLang;
1146
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                                         $wgLang->timeAndDate( $timestamp, true ),
1158                                         $wgLang->date( $timestamp, true ),
1159                                         $wgLang->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         protected function preventClickjacking( $enable = true ) {
1174                 $this->preventClickjacking = $enable;
1175         }
1176
1177         public function getPreventClickjacking() {
1178                 return $this->preventClickjacking;
1179         }
1180 }
1181
1182 class ImageHistoryPseudoPager extends ReverseChronologicalPager {
1183         protected $preventClickjacking = false;
1184
1185         /**
1186          * @var File
1187          */
1188         protected $mImg;
1189
1190         /**
1191          * @var Title
1192          */
1193         protected $mTitle;
1194
1195         /**
1196          * @param ImagePage $imagePage
1197          */
1198         function __construct( $imagePage ) {
1199                 parent::__construct();
1200                 $this->mImagePage = $imagePage;
1201                 $this->mTitle = clone ( $imagePage->getTitle() );
1202                 $this->mTitle->setFragment( '#filehistory' );
1203                 $this->mImg = null;
1204                 $this->mHist = array();
1205                 $this->mRange = array( 0, 0 ); // display range
1206         }
1207
1208         function getTitle() {
1209                 return $this->mTitle;
1210         }
1211
1212         function getQueryInfo() {
1213                 return false;
1214         }
1215
1216         function getIndexField() {
1217                 return '';
1218         }
1219
1220         function formatRow( $row ) {
1221                 return '';
1222         }
1223
1224         function getBody() {
1225                 $s = '';
1226                 $this->doQuery();
1227                 if ( count( $this->mHist ) ) {
1228                         $list = new ImageHistoryList( $this->mImagePage );
1229                         # Generate prev/next links
1230                         $navLink = $this->getNavigationBar();
1231                         $s = $list->beginImageHistoryList( $navLink );
1232                         // Skip rows there just for paging links
1233                         for ( $i = $this->mRange[0]; $i <= $this->mRange[1]; $i++ ) {
1234                                 $file = $this->mHist[$i];
1235                                 $s .= $list->imageHistoryLine( !$file->isOld(), $file );
1236                         }
1237                         $s .= $list->endImageHistoryList( $navLink );
1238
1239                         if ( $list->getPreventClickjacking() ) {
1240                                 $this->preventClickjacking();
1241                         }
1242                 }
1243                 return $s;
1244         }
1245
1246         function doQuery() {
1247                 if ( $this->mQueryDone ) {
1248                         return;
1249                 }
1250                 $this->mImg = $this->mImagePage->getFile(); // ensure loading
1251                 if ( !$this->mImg->exists() ) {
1252                         return;
1253                 }
1254                 $queryLimit = $this->mLimit + 1; // limit plus extra row
1255                 if ( $this->mIsBackwards ) {
1256                         // Fetch the file history
1257                         $this->mHist = $this->mImg->getHistory( $queryLimit, null, $this->mOffset, false );
1258                         // The current rev may not meet the offset/limit
1259                         $numRows = count( $this->mHist );
1260                         if ( $numRows <= $this->mLimit && $this->mImg->getTimestamp() > $this->mOffset ) {
1261                                 $this->mHist = array_merge( array( $this->mImg ), $this->mHist );
1262                         }
1263                 } else {
1264                         // The current rev may not meet the offset
1265                         if ( !$this->mOffset || $this->mImg->getTimestamp() < $this->mOffset ) {
1266                                 $this->mHist[] = $this->mImg;
1267                         }
1268                         // Old image versions (fetch extra row for nav links)
1269                         $oiLimit = count( $this->mHist ) ? $this->mLimit : $this->mLimit + 1;
1270                         // Fetch the file history
1271                         $this->mHist = array_merge( $this->mHist,
1272                                 $this->mImg->getHistory( $oiLimit, $this->mOffset, null, false ) );
1273                 }
1274                 $numRows = count( $this->mHist ); // Total number of query results
1275                 if ( $numRows ) {
1276                         # Index value of top item in the list
1277                         $firstIndex = $this->mIsBackwards ?
1278                                 $this->mHist[$numRows - 1]->getTimestamp() : $this->mHist[0]->getTimestamp();
1279                         # Discard the extra result row if there is one
1280                         if ( $numRows > $this->mLimit && $numRows > 1 ) {
1281                                 if ( $this->mIsBackwards ) {
1282                                         # Index value of item past the index
1283                                         $this->mPastTheEndIndex = $this->mHist[0]->getTimestamp();
1284                                         # Index value of bottom item in the list
1285                                         $lastIndex = $this->mHist[1]->getTimestamp();
1286                                         # Display range
1287                                         $this->mRange = array( 1, $numRows - 1 );
1288                                 } else {
1289                                         # Index value of item past the index
1290                                         $this->mPastTheEndIndex = $this->mHist[$numRows - 1]->getTimestamp();
1291                                         # Index value of bottom item in the list
1292                                         $lastIndex = $this->mHist[$numRows - 2]->getTimestamp();
1293                                         # Display range
1294                                         $this->mRange = array( 0, $numRows - 2 );
1295                                 }
1296                         } else {
1297                                 # Setting indexes to an empty string means that they will be
1298                                 # omitted if they would otherwise appear in URLs. It just so
1299                                 # happens that this  is the right thing to do in the standard
1300                                 # UI, in all the relevant cases.
1301                                 $this->mPastTheEndIndex = '';
1302                                 # Index value of bottom item in the list
1303                                 $lastIndex = $this->mIsBackwards ?
1304                                         $this->mHist[0]->getTimestamp() : $this->mHist[$numRows - 1]->getTimestamp();
1305                                 # Display range
1306                                 $this->mRange = array( 0, $numRows - 1 );
1307                         }
1308                 } else {
1309                         $firstIndex = '';
1310                         $lastIndex = '';
1311                         $this->mPastTheEndIndex = '';
1312                 }
1313                 if ( $this->mIsBackwards ) {
1314                         $this->mIsFirst = ( $numRows < $queryLimit );
1315                         $this->mIsLast = ( $this->mOffset == '' );
1316                         $this->mLastShown = $firstIndex;
1317                         $this->mFirstShown = $lastIndex;
1318                 } else {
1319                         $this->mIsFirst = ( $this->mOffset == '' );
1320                         $this->mIsLast = ( $numRows < $queryLimit );
1321                         $this->mLastShown = $lastIndex;
1322                         $this->mFirstShown = $firstIndex;
1323                 }
1324                 $this->mQueryDone = true;
1325         }
1326
1327         protected function preventClickjacking( $enable = true ) {
1328                 $this->preventClickjacking = $enable;
1329         }
1330
1331         public function getPreventClickjacking() {
1332                 return $this->preventClickjacking;
1333         }
1334
1335 }