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' => $pageLang->getDir(),
 121                                 'class' => 'mw-content-'.$pageLang->getDir() ) ) );
 122                         parent::view();
 123                         $wgOut->addHTML( Xml::closeElement( 'div' ) );
 124                 } else {
 125                         # Just need to set the right headers
 126                         $wgOut->setArticleFlag( true );
 127                         $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
 128                         $this->viewUpdates();
 129                 }
 130
 131                 # Show shared description, if needed
 132                 if ( $this->mExtraDescription ) {
 133                         $fol = wfMessage( 'shareddescriptionfollows' );
 134                         if ( !$fol->isDisabled() ) {
 135                                 $wgOut->addWikiText( $fol->plain() );
 136                         }
 137                         $wgOut->addHTML( '<div id="shared-image-desc">' . $this->mExtraDescription . "</div>\n" );
 138                 }
 139
 140                 $this->closeShowImage();
 141                 $this->imageHistory();
 142                 // TODO: Cleanup the following
 143
 144                 $wgOut->addHTML( Xml::element( 'h2',
 145                         array( 'id' => 'filelinks' ),
 146                         wfMsg( 'imagelinks' ) ) . "\n" );
 147                 $this->imageDupes();
 148                 # @todo FIXME: For some freaky reason, we can't redirect to foreign images.
 149                 # Yet we return metadata about the target. Definitely an issue in the FileRepo
 150                 $this->imageLinks();
 151
 152                 # Allow extensions to add something after the image links
 153                 $html = '';
 154                 wfRunHooks( 'ImagePageAfterImageLinks', array( $this, &$html ) );
 155                 if ( $html ) {
 156                         $wgOut->addHTML( $html );
 157                 }
 158
 159                 if ( $showmeta ) {
 160                         $wgOut->addHTML( Xml::element( 'h2', array( 'id' => 'metadata' ), wfMsg( 'metadata' ) ) . "\n" );
 161                         $wgOut->addWikiText( $this->makeMetadataTable( $formattedMetadata ) );
 162                         $wgOut->addModules( array( 'mediawiki.action.view.metadata' ) );
 163                 }
 164
 165                 $css = $this->repo->getDescriptionStylesheetUrl();
 166                 if ( $css ) {
 167                         $wgOut->addStyle( $css );
 168                 }
 169         }
 170
 171         public function getRedirectTarget() {
 172                 $this->loadFile();
 173                 if ( $this->img->isLocal() ) {
 174                         return parent::getRedirectTarget();
 175                 }
 176                 // Foreign image page
 177                 $from = $this->img->getRedirected();
 178                 $to = $this->img->getName();
 179                 if ( $from == $to ) {
 180                         return null;
 181                 }
 182                 return $this->mRedirectTarget = Title::makeTitle( NS_FILE, $to );
 183         }
 184
 185         public function followRedirect() {
 186                 $this->loadFile();
 187                 if ( $this->img->isLocal() ) {
 188                         return parent::followRedirect();
 189                 }
 190                 $from = $this->img->getRedirected();
 191                 $to = $this->img->getName();
 192                 if ( $from == $to ) {
 193                         return false;
 194                 }
 195                 return Title::makeTitle( NS_FILE, $to );
 196         }
 197
 198         public function isRedirect( $text = false ) {
 199                 $this->loadFile();
 200                 if ( $this->img->isLocal() ) {
 201                         return parent::isRedirect( $text );
 202                 }
 203
 204                 return (bool)$this->img->getRedirected();
 205         }
 206
 207         public function isLocal() {
 208                 $this->loadFile();
 209                 return $this->img->isLocal();
 210         }
 211
 212         public function getFile() {
 213                 $this->loadFile();
 214                 return $this->img;
 215         }
 216
 217         public function getDisplayedFile() {
 218                 $this->loadFile();
 219                 return $this->displayImg;
 220         }
 221
 222         public function getDuplicates() {
 223                 $this->loadFile();
 224                 if ( !is_null( $this->dupes ) ) {
 225                         return $this->dupes;
 226                 }
 227                 $hash = $this->img->getSha1();
 228                 if ( !( $hash ) ) {
 229                         return $this->dupes = array();
 230                 }
 231                 $dupes = RepoGroup::singleton()->findBySha1( $hash );
 232                 // Remove duplicates with self and non matching file sizes
 233                 $self = $this->img->getRepoName() . ':' . $this->img->getName();
 234                 $size = $this->img->getSize();
 235                 foreach ( $dupes as $index => $file ) {
 236                         $key = $file->getRepoName() . ':' . $file->getName();
 237                         if ( $key == $self ) {
 238                                 unset( $dupes[$index] );
 239                         }
 240                         if ( $file->getSize() != $size ) {
 241                                 unset( $dupes[$index] );
 242                         }
 243                 }
 244                 return $this->dupes = $dupes;
 245         }
 246
 247         /**
 248          * Create the TOC
 249          *
 250          * @param $metadata Boolean: whether or not to show the metadata link
 251          * @return String
 252          */
 253         protected function showTOC( $metadata ) {
 254                 $r = array(
 255                         '<li><a href="#file">' . wfMsgHtml( 'file-anchor-link' ) . '</a></li>',
 256                         '<li><a href="#filehistory">' . wfMsgHtml( 'filehist' ) . '</a></li>',
 257                         '<li><a href="#filelinks">' . wfMsgHtml( 'imagelinks' ) . '</a></li>',
 258                 );
 259                 if ( $metadata ) {
 260                         $r[] = '<li><a href="#metadata">' . wfMsgHtml( 'metadata' ) . '</a></li>';
 261                 }
 262
 263                 wfRunHooks( 'ImagePageShowTOC', array( $this, &$r ) );
 264
 265                 return '<ul id="filetoc">' . implode( "\n", $r ) . '</ul>';
 266         }
 267
 268         /**
 269          * Make a table with metadata to be shown in the output page.
 270          *
 271          * @todo FIXME: Bad interface, see note on MediaHandler::formatMetadata().
 272          *
 273          * @param $metadata Array: the array containing the EXIF data
 274          * @return String The metadata table. This is treated as Wikitext (!)
 275          */
 276         protected function makeMetadataTable( $metadata ) {
 277                 $r = "<div class=\"mw-imagepage-section-metadata\">";
 278                 $r .= wfMsgNoTrans( 'metadata-help' );
 279                 $r .= "<table id=\"mw_metadata\" class=\"mw_metadata\">\n";
 280                 foreach ( $metadata as $type => $stuff ) {
 281                         foreach ( $stuff as $v ) {
 282                                 # @todo FIXME: Why is this using escapeId for a class?!
 283                                 $class = Sanitizer::escapeId( $v['id'] );
 284                                 if ( $type == 'collapsed' ) {
 285                                         $class .= ' collapsable';
 286                                 }
 287                                 $r .= "<tr class=\"$class\">\n";
 288                                 $r .= "<th>{$v['name']}</th>\n";
 289                                 $r .= "<td>{$v['value']}</td>\n</tr>";
 290                         }
 291                 }
 292                 $r .= "</table>\n</div>\n";
 293                 return $r;
 294         }
 295
 296         /**
 297          * Overloading Article's getContent method.
 298          *
 299          * Omit noarticletext if sharedupload; text will be fetched from the
 300          * shared upload server if possible.
 301          */
 302         public function getContent() {
 303                 $this->loadFile();
 304                 if ( $this->img && !$this->img->isLocal() && 0 == $this->getID() ) {
 305                         return '';
 306                 }
 307                 return parent::getContent();
 308         }
 309
 310         protected function openShowImage() {
 311                 global $wgOut, $wgUser, $wgImageLimits, $wgRequest,
 312                         $wgLang, $wgEnableUploads;
 313
 314                 $this->loadFile();
 315
 316                 $sizeSel = intval( $wgUser->getOption( 'imagesize' ) );
 317                 if ( !isset( $wgImageLimits[$sizeSel] ) ) {
 318                         $sizeSel = User::getDefaultOption( 'imagesize' );
 319
 320                         // The user offset might still be incorrect, specially if
 321                         // $wgImageLimits got changed (see bug #8858).
 322                         if ( !isset( $wgImageLimits[$sizeSel] ) ) {
 323                                 // Default to the first offset in $wgImageLimits
 324                                 $sizeSel = 0;
 325                         }
 326                 }
 327                 $max = $wgImageLimits[$sizeSel];
 328                 $maxWidth = $max[0];
 329                 $maxHeight = $max[1];
 330                 $sk = $wgUser->getSkin();
 331                 $dirmark = wfUILang()->getDirMark();
 332
 333                 if ( $this->displayImg->exists() ) {
 334                         # image
 335                         $page = $wgRequest->getIntOrNull( 'page' );
 336                         if ( is_null( $page ) ) {
 337                                 $params = array();
 338                                 $page = 1;
 339                         } else {
 340                                 $params = array( 'page' => $page );
 341                         }
 342                         $width_orig = $this->displayImg->getWidth( $page );
 343                         $width = $width_orig;
 344                         $height_orig = $this->displayImg->getHeight( $page );
 345                         $height = $height_orig;
 346
 347                         $longDesc = wfMsg( 'parentheses', $this->displayImg->getLongDesc() );
 348
 349                         wfRunHooks( 'ImageOpenShowImageInlineBefore', array( &$this, &$wgOut ) );
 350
 351                         if ( $this->displayImg->allowInlineDisplay() ) {
 352                                 # image
 353
 354                                 # "Download high res version" link below the image
 355                                 # $msgsize = wfMsgHtml( 'file-info-size', $width_orig, $height_orig, $sk->formatSize( $this->displayImg->getSize() ), $mime );
 356                                 # We'll show a thumbnail of this image
 357                                 if ( $width > $maxWidth || $height > $maxHeight ) {
 358                                         # Calculate the thumbnail size.
 359                                         # First case, the limiting factor is the width, not the height.
 360                                         if ( $width / $height >= $maxWidth / $maxHeight ) {
 361                                                 $height = round( $height * $maxWidth / $width );
 362                                                 $width = $maxWidth;
 363                                                 # Note that $height <= $maxHeight now.
 364                                         } else {
 365                                                 $newwidth = floor( $width * $maxHeight / $height );
 366                                                 $height = round( $height * $newwidth / $width );
 367                                                 $width = $newwidth;
 368                                                 # Note that $height <= $maxHeight now, but might not be identical
 369                                                 # because of rounding.
 370                                         }
 371                                         $msgbig  = wfMsgHtml( 'show-big-image' );
 372                                         $otherSizes = array();
 373                                         foreach ( $wgImageLimits as $size ) {
 374                                                 if ( $size[0] < $width_orig && $size[1] < $height_orig &&
 375                                                                 $size[0] != $width && $size[1] != $height ) {
 376                                                         $otherSizes[] = $this->makeSizeLink( $params, $size[0], $size[1] );
 377                                                 }
 378                                         }
 379                                         $msgsmall = wfMessage( 'show-big-image-preview' )->
 380                                                 rawParams( $this->makeSizeLink( $params, $width, $height ) )->
 381                                                 parse() . ' ' .
 382                                                 wfMessage( 'show-big-image-other' )->
 383                                                 rawParams( $wgLang->pipeList( $otherSizes ) )->parse();
 384                                 } else {
 385                                         # Image is small enough to show full size on image page
 386                                         $msgsmall = wfMsgExt( 'file-nohires', array( 'parseinline' ) );
 387                                 }
 388
 389                                 $params['width'] = $width;
 390                                 $params['height'] = $height;
 391                                 $thumbnail = $this->displayImg->transform( $params );
 392
 393                                 $showLink = true;
 394                                 $anchorclose = '<br />' . $msgsmall;
 395
 396                                 $isMulti = $this->displayImg->isMultipage() && $this->displayImg->pageCount() > 1;
 397                                 if ( $isMulti ) {
 398                                         $wgOut->addHTML( '<table class="multipageimage"><tr><td>' );
 399                                 }
 400
 401                                 if ( $thumbnail ) {
 402                                         $options = array(
 403                                                 'alt' => $this->displayImg->getTitle()->getPrefixedText(),
 404                                                 'file-link' => true,
 405                                         );
 406                                         $wgOut->addHTML( '<div class="fullImageLink" id="file">' .
 407                                                 $thumbnail->toHtml( $options ) .
 408                                                 $anchorclose . "</div>\n" );
 409                                 }
 410
 411                                 if ( $isMulti ) {
 412                                         $count = $this->displayImg->pageCount();
 413
 414                                         if ( $page > 1 ) {
 415                                                 $label = $wgOut->parse( wfMsg( 'imgmultipageprev' ), false );
 416                                                 $link = $sk->link(
 417                                                         $this->mTitle,
 418                                                         $label,
 419                                                         array(),
 420                                                         array( 'page' => $page - 1 ),
 421                                                         array( 'known', 'noclasses' )
 422                                                 );
 423                                                 $thumb1 = $sk->makeThumbLinkObj( $this->mTitle, $this->displayImg, $link, $label, 'none',
 424                                                         array( 'page' => $page - 1 ) );
 425                                         } else {
 426                                                 $thumb1 = '';
 427                                         }
 428
 429                                         if ( $page < $count ) {
 430                                                 $label = wfMsg( 'imgmultipagenext' );
 431                                                 $link = $sk->link(
 432                                                         $this->mTitle,
 433                                                         $label,
 434                                                         array(),
 435                                                         array( 'page' => $page + 1 ),
 436                                                         array( 'known', 'noclasses' )
 437                                                 );
 438                                                 $thumb2 = $sk->makeThumbLinkObj( $this->mTitle, $this->displayImg, $link, $label, 'none',
 439                                                         array( 'page' => $page + 1 ) );
 440                                         } else {
 441                                                 $thumb2 = '';
 442                                         }
 443
 444                                         global $wgScript;
 445
 446                                         $formParams = array(
 447                                                 'name' => 'pageselector',
 448                                                 'action' => $wgScript,
 449                                                 'onchange' => 'document.pageselector.submit();',
 450                                         );
 451
 452                                         for ( $i = 1; $i <= $count; $i++ ) {
 453                                                 $options[] = Xml::option( $wgLang->formatNum( $i ), $i, $i == $page );
 454                                         }
 455                                         $select = Xml::tags( 'select',
 456                                                 array( 'id' => 'pageselector', 'name' => 'page' ),
 457                                                 implode( "\n", $options ) );
 458
 459                                         $wgOut->addHTML(
 460                                                 '</td><td><div class="multipageimagenavbox">' .
 461                                                 Xml::openElement( 'form', $formParams ) .
 462                                                 Html::hidden( 'title', $this->getTitle()->getPrefixedDBkey() ) .
 463                                                 wfMsgExt( 'imgmultigoto', array( 'parseinline', 'replaceafter' ), $select ) .
 464                                                 Xml::submitButton( wfMsg( 'imgmultigo' ) ) .
 465                                                 Xml::closeElement( 'form' ) .
 466                                                 "<hr />$thumb1\n$thumb2<br clear=\"all\" /></div></td></tr></table>"
 467                                         );
 468                                 }
 469                         } else {
 470                                 # if direct link is allowed but it's not a renderable image, show an icon.
 471                                 if ( $this->displayImg->isSafeFile() ) {
 472                                         $icon = $this->displayImg->iconThumb();
 473
 474                                         $wgOut->addHTML( '<div class="fullImageLink" id="file">' .
 475                                                 $icon->toHtml( array( 'file-link' => true ) ) .
 476                                                 "</div>\n" );
 477                                 }
 478
 479                                 $showLink = true;
 480                         }
 481
 482                         if ( $showLink ) {
 483                                 $filename = wfEscapeWikiText( $this->displayImg->getName() );
 484                                 $linktext = $filename;
 485                                 if ( isset( $msgbig ) ) {
 486                                         $linktext = wfEscapeWikiText( $msgbig );
 487                                 }
 488                                 $medialink = "[[Media:$filename|$linktext]]";
 489
 490                                 if ( !$this->displayImg->isSafeFile() ) {
 491                                         $warning = wfMsgNoTrans( 'mediawarning' );
 492                                         $wgOut->addWikiText( <<<EOT
 493 <div class="fullMedia"><span class="dangerousLink">{$medialink}</span>$dirmark <span class="fileInfo">$longDesc</span></div>
 494 <div class="mediaWarning">$warning</div>
 495 EOT
 496                                                 );
 497                                 } else {
 498                                         $wgOut->addWikiText( <<<EOT
 499 <div class="fullMedia">{$medialink}{$dirmark} <span class="fileInfo">$longDesc</span>
 500 </div>
 501 EOT
 502                                         );
 503                                 }
 504                         }
 505
 506                         if ( !$this->displayImg->isLocal() ) {
 507                                 $this->printSharedImageText();
 508                         }
 509                 } else {
 510                         # Image does not exist
 511                         if ( $wgEnableUploads && $wgUser->isAllowed( 'upload' ) ) {
 512                                 // Only show an upload link if the user can upload
 513                                 $uploadTitle = SpecialPage::getTitleFor( 'Upload' );
 514                                 $nofile = array(
 515                                         'filepage-nofile-link',
 516                                         $uploadTitle->getFullURL( array( 'wpDestFile' => $this->img->getName() ) )
 517                                 );
 518                         } else {
 519                                 $nofile = 'filepage-nofile';
 520                         }
 521                         // Note, if there is an image description page, but
 522                         // no image, then this setRobotPolicy is overriden
 523                         // by Article::View().
 524                         $wgOut->setRobotPolicy( 'noindex,nofollow' );
 525                         $wgOut->wrapWikiMsg( "<div id='mw-imagepage-nofile' class='plainlinks'>\n$1\n</div>", $nofile );
 526                         if ( !$this->getID() ) {
 527                                 // If there is no image, no shared image, and no description page,
 528                                 // output a 404, to be consistent with articles.
 529                                 $wgRequest->response()->header( 'HTTP/1.1 404 Not Found' );
 530                         }
 531                 }
 532         }
 533
 534         /**
 535          * Creates an thumbnail of specified size and returns an HTML link to it
 536          * @param array $params Scaler parameters
 537          * @param int $width
 538          * @param int $height
 539          */
 540         private function makeSizeLink( $params, $width, $height ) {
 541                 $params['width'] = $width;
 542                 $params['height'] = $height;
 543                 $thumbnail = $this->displayImg->transform( $params );
 544                 if ( $thumbnail && !$thumbnail->isError() ) {
 545                         return Html::rawElement( 'a', array(
 546                                 'href' => $thumbnail->getUrl(),
 547                                 'class' => 'mw-thumbnail-link'
 548                                 ), wfMessage( 'show-big-image-size' )->numParams(
 549                                         $thumbnail->getWidth(), $thumbnail->getHeight()
 550                                 )->parse() );
 551                 } else {
 552                         return '';
 553                 }
 554         }
 555
 556         /**
 557          * Show a notice that the file is from a shared repository
 558          */
 559         protected function printSharedImageText() {
 560                 global $wgOut;
 561
 562                 $this->loadFile();
 563
 564                 $descUrl = $this->img->getDescriptionUrl();
 565                 $descText = $this->img->getDescriptionText();
 566
 567                 /* Add canonical to head if there is no local page for this shared file */
 568                 if( $descUrl && $this->getID() == 0 ) {
 569                         $wgOut->addLink( array( 'rel' => 'canonical', 'href' => $descUrl ) );
 570                 }
 571
 572                 $wrap = "<div class=\"sharedUploadNotice\">\n$1\n</div>\n";
 573                 $repo = $this->img->getRepo()->getDisplayName();
 574
 575                 if ( $descUrl && $descText && wfMsgNoTrans( 'sharedupload-desc-here' ) !== '-'  ) {
 576                         $wgOut->wrapWikiMsg( $wrap, array( 'sharedupload-desc-here', $repo, $descUrl ) );
 577                 } elseif ( $descUrl && wfMsgNoTrans( 'sharedupload-desc-there' ) !== '-' ) {
 578                         $wgOut->wrapWikiMsg( $wrap, array( 'sharedupload-desc-there', $repo, $descUrl ) );
 579                 } else {
 580                         $wgOut->wrapWikiMsg( $wrap, array( 'sharedupload', $repo ), ''/*BACKCOMPAT*/ );
 581                 }
 582
 583                 if ( $descText ) {
 584                         $this->mExtraDescription = $descText;
 585                 }
 586         }
 587
 588         public function getUploadUrl() {
 589                 $this->loadFile();
 590                 $uploadTitle = SpecialPage::getTitleFor( 'Upload' );
 591                 return $uploadTitle->getFullURL( array(
 592                         'wpDestFile' => $this->img->getName(),
 593                         'wpForReUpload' => 1
 594                  ) );
 595         }
 596
 597         /**
 598          * Print out the various links at the bottom of the image page, e.g. reupload,
 599          * external editing (and instructions link) etc.
 600          */
 601         protected function uploadLinksBox() {
 602                 global $wgUser, $wgOut, $wgEnableUploads, $wgUseExternalEditor;
 603
 604                 if ( !$wgEnableUploads ) {
 605                         return;
 606                 }
 607
 608                 $this->loadFile();
 609                 if ( !$this->img->isLocal() ) {
 610                         return;
 611                 }
 612
 613                 $sk = $wgUser->getSkin();
 614
 615                 $wgOut->addHTML( "<br /><ul>\n" );
 616
 617                 # "Upload a new version of this file" link
 618                 if ( UploadBase::userCanReUpload( $wgUser, $this->img->name ) ) {
 619                         $ulink = $sk->makeExternalLink( $this->getUploadUrl(), wfMsg( 'uploadnewversion-linktext' ) );
 620                         $wgOut->addHTML( "<li id=\"mw-imagepage-reupload-link\"><div class=\"plainlinks\">{$ulink}</div></li>\n" );
 621                 }
 622
 623                 # External editing link
 624                 if ( $wgUseExternalEditor ) {
 625                         $elink = $sk->link(
 626                                 $this->mTitle,
 627                                 wfMsgHtml( 'edit-externally' ),
 628                                 array(),
 629                                 array(
 630                                         'action' => 'edit',
 631                                         'externaledit' => 'true',
 632                                         'mode' => 'file'
 633                                 ),
 634                                 array( 'known', 'noclasses' )
 635                         );
 636                         $wgOut->addHTML(
 637                                 '<li id="mw-imagepage-edit-external">' . $elink . ' <small>' .
 638                                 wfMsgExt( 'edit-externally-help', array( 'parseinline' ) ) .
 639                                 "</small></li>\n"
 640                         );
 641                 }
 642
 643                 $wgOut->addHTML( "</ul>\n" );
 644         }
 645
 646         protected function closeShowImage() { } # For overloading
 647
 648         /**
 649          * If the page we've just displayed is in the "Image" namespace,
 650          * we follow it with an upload history of the image and its usage.
 651          */
 652         protected function imageHistory() {
 653                 global $wgOut;
 654
 655                 $this->loadFile();
 656                 $pager = new ImageHistoryPseudoPager( $this );
 657                 $wgOut->addHTML( $pager->getBody() );
 658                 $wgOut->preventClickjacking( $pager->getPreventClickjacking() );
 659
 660                 $this->img->resetHistory(); // free db resources
 661
 662                 # Exist check because we don't want to show this on pages where an image
 663                 # doesn't exist along with the noimage message, that would suck. -ævar
 664                 if ( $this->img->exists() ) {
 665                         $this->uploadLinksBox();
 666                 }
 667         }
 668
 669         protected function queryImageLinks( $target, $limit ) {
 670                 $dbr = wfGetDB( DB_SLAVE );
 671
 672                 return $dbr->select(
 673                         array( 'imagelinks', 'page' ),
 674                         array( 'page_namespace', 'page_title', 'page_is_redirect', 'il_to' ),
 675                         array( 'il_to' => $target, 'il_from = page_id' ),
 676                         __METHOD__,
 677                         array( 'LIMIT' => $limit + 1 )
 678                 );
 679         }
 680
 681         protected function imageLinks() {
 682                 global $wgUser, $wgOut, $wgLang;
 683
 684                 $limit = 100;
 685
 686                 $res = $this->queryImageLinks( $this->mTitle->getDbKey(), $limit + 1);
 687                 $rows = array();
 688                 $redirects = array();
 689                 foreach ( $res as $row ) {
 690                         if ( $row->page_is_redirect ) {
 691                                 $redirects[$row->page_title] = array();
 692                         }
 693                         $rows[] = $row;
 694                 }
 695                 $count = count( $rows );
 696
 697                 $hasMore = $count > $limit;
 698                 if ( !$hasMore && count( $redirects ) ) {
 699                         $res = $this->queryImageLinks( array_keys( $redirects ),
 700                                 $limit - count( $rows ) + 1 );
 701                         foreach ( $res as $row ) {
 702                                 $redirects[$row->il_to][] = $row;
 703                                 $count++;
 704                         }
 705                         $hasMore = ( $res->numRows() + count( $rows ) ) > $limit;
 706                 }
 707
 708                 if ( $count == 0 ) {
 709                         $wgOut->wrapWikiMsg(
 710                                 Html::rawElement( 'div',
 711                                         array( 'id' => 'mw-imagepage-nolinkstoimage' ), "\n$1\n" ),
 712                                 'nolinkstoimage'
 713                         );
 714                         return;
 715                 }
 716
 717                 $wgOut->addHTML( "<div id='mw-imagepage-section-linkstoimage'>\n" );
 718                 if ( !$hasMore ) {
 719                         $wgOut->addWikiMsg( 'linkstoimage', $count );
 720                 } else {
 721                         // More links than the limit. Add a link to [[Special:Whatlinkshere]]
 722                         $wgOut->addWikiMsg( 'linkstoimage-more',
 723                                 $wgLang->formatNum( $limit ),
 724                                 $this->mTitle->getPrefixedDBkey()
 725                         );
 726                 }
 727
 728                 $wgOut->addHTML(
 729                         Html::openElement( 'ul',
 730                                 array( 'class' => 'mw-imagepage-linkstoimage' ) ) . "\n"
 731                 );
 732                 $sk = $wgUser->getSkin();
 733                 $count = 0;
 734
 735                 // Sort the list by namespace:title
 736                 usort( $rows, array( $this, 'compare' ) );
 737
 738                 // Create links for every element
 739                 $currentCount = 0;
 740                 foreach( $rows as $element ) {
 741                         $currentCount++;
 742                         if ( $currentCount > $limit ) {
 743                                 break;
 744                         }
 745
 746                         $link = $sk->linkKnown( Title::makeTitle( $element->page_namespace, $element->page_title ) );
 747                         if ( !isset( $redirects[$element->page_title] ) ) {
 748                                 $liContents = $link;
 749                         } else {
 750                                 $ul = "<ul class='mw-imagepage-redirectstofile'>\n";
 751                                 foreach ( $redirects[$element->page_title] as $row ) {
 752                                         $currentCount++;
 753                                         if ( $currentCount > $limit ) {
 754                                                 break;
 755                                         }
 756
 757                                         $link2 = $sk->linkKnown( Title::makeTitle( $row->page_namespace, $row->page_title ) );
 758                                         $ul .= Html::rawElement(
 759                                                 'li',
 760                                                 array( 'id' => 'mw-imagepage-linkstoimage-ns' . $element->page_namespace ),
 761                                                 $link2
 762                                                 ) . "\n";
 763                                 }
 764                                 $ul .= '</ul>';
 765                                 $liContents = wfMessage( 'linkstoimage-redirect' )->rawParams(
 766                                         $link, $ul )->parse();
 767                         }
 768                         $wgOut->addHTML( Html::rawElement(
 769                                         'li',
 770                                         array( 'id' => 'mw-imagepage-linkstoimage-ns' . $element->page_namespace ),
 771                                         $liContents
 772                                 ) . "\n"
 773                         );
 774
 775                 };
 776                 $wgOut->addHTML( Html::closeElement( 'ul' ) . "\n" );
 777                 $res->free();
 778
 779                 // Add a links to [[Special:Whatlinkshere]]
 780                 if ( $count > $limit ) {
 781                         $wgOut->addWikiMsg( 'morelinkstoimage', $this->mTitle->getPrefixedDBkey() );
 782                 }
 783                 $wgOut->addHTML( Html::closeElement( 'div' ) . "\n" );
 784         }
 785
 786         protected function imageDupes() {
 787                 global $wgOut, $wgUser, $wgLang;
 788
 789                 $this->loadFile();
 790
 791                 $dupes = $this->getDuplicates();
 792                 if ( count( $dupes ) == 0 ) {
 793                         return;
 794                 }
 795
 796                 $wgOut->addHTML( "<div id='mw-imagepage-section-duplicates'>\n" );
 797                 $wgOut->addWikiMsg( 'duplicatesoffile',
 798                         $wgLang->formatNum( count( $dupes ) ), $this->mTitle->getDBkey()
 799                 );
 800                 $wgOut->addHTML( "<ul class='mw-imagepage-duplicates'>\n" );
 801
 802                 $sk = $wgUser->getSkin();
 803                 foreach ( $dupes as $file ) {
 804                         $fromSrc = '';
 805                         if ( $file->isLocal() ) {
 806                                 $link = $sk->link(
 807                                         $file->getTitle(),
 808                                         null,
 809                                         array(),
 810                                         array(),
 811                                         array( 'known', 'noclasses' )
 812                                 );
 813                         } else {
 814                                 $link = $sk->makeExternalLink( $file->getDescriptionUrl(),
 815                                         $file->getTitle()->getPrefixedText() );
 816                                 $fromSrc = wfMsg( 'shared-repo-from', $file->getRepo()->getDisplayName() );
 817                         }
 818                         $wgOut->addHTML( "<li>{$link} {$fromSrc}</li>\n" );
 819                 }
 820                 $wgOut->addHTML( "</ul></div>\n" );
 821         }
 822
 823         /**
 824          * Delete the file, or an earlier version of it
 825          */
 826         public function delete() {
 827                 global $wgUploadMaintenance;
 828                 if ( $wgUploadMaintenance && $this->mTitle && $this->mTitle->getNamespace() == NS_FILE ) {
 829                         global $wgOut;
 830                         $wgOut->wrapWikiMsg( "<div class='error'>\n$1\n</div>\n", array( 'filedelete-maintenance' ) );
 831                         return;
 832                 }
 833
 834                 $this->loadFile();
 835                 if ( !$this->img->exists() || !$this->img->isLocal() || $this->img->getRedirected() ) {
 836                         // Standard article deletion
 837                         parent::delete();
 838                         return;
 839                 }
 840                 $deleter = new FileDeleteForm( $this->img );
 841                 $deleter->execute();
 842         }
 843
 844         /**
 845          * Revert the file to an earlier version
 846          */
 847         public function revert() {
 848                 $this->loadFile();
 849                 $reverter = new FileRevertForm( $this->img );
 850                 $reverter->execute();
 851         }
 852
 853         /**
 854          * Override handling of action=purge
 855          */
 856         public function doPurge() {
 857                 $this->loadFile();
 858                 if ( $this->img->exists() ) {
 859                         wfDebug( 'ImagePage::doPurge purging ' . $this->img->getName() . "\n" );
 860                         $update = new HTMLCacheUpdate( $this->mTitle, 'imagelinks' );
 861                         $update->doUpdate();
 862                         $this->img->upgradeRow();
 863                         $this->img->purgeCache();
 864                 } else {
 865                         wfDebug( 'ImagePage::doPurge no image for ' . $this->img->getName() . "; limiting purge to cache only\n" );
 866                         // even if the file supposedly doesn't exist, force any cached information
 867                         // to be updated (in case the cached information is wrong)
 868                         $this->img->purgeCache();
 869                 }
 870                 parent::doPurge();
 871         }
 872
 873         /**
 874          * Display an error with a wikitext description
 875          */
 876         function showError( $description ) {
 877                 global $wgOut;
 878                 $wgOut->setPageTitle( wfMsg( 'internalerror' ) );
 879                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
 880                 $wgOut->setArticleRelated( false );
 881                 $wgOut->enableClientCache( false );
 882                 $wgOut->addWikiText( $description );
 883         }
 884
 885         /**
 886          * Callback for usort() to do link sorts by (namespace, title)
 887          * Function copied from Title::compare()
 888          *
 889          * @param $a object page to compare with
 890          * @param $b object page to compare with
 891          * @return Integer: result of string comparison, or namespace comparison
 892          */
 893         protected function compare( $a, $b ) {
 894                 if ( $a->page_namespace == $b->page_namespace ) {
 895                         return strcmp( $a->page_title, $b->page_title );
 896                 } else {
 897                         return $a->page_namespace - $b->page_namespace;
 898                 }
 899         }
 900 }
 901
 902 /**
 903  * Builds the image revision log shown on image pages
 904  *
 905  * @ingroup Media
 906  */
 907 class ImageHistoryList {
 908
 909         /**
 910          * @var Title
 911          */
 912         protected $title;
 913
 914         /**
 915          * @var File
 916          */
 917         protected $img;
 918
 919         /**
 920          * @var ImagePage
 921          */
 922         protected $imagePage;
 923
 924         /**
 925          * @var Skin
 926          */
 927         protected $skin;
 928
 929         protected $repo, $showThumb;
 930         protected $preventClickjacking = false;
 931
 932         /**
 933          * @param ImagePage $imagePage
 934          */
 935         public function __construct( $imagePage ) {
 936                 global $wgUser, $wgShowArchiveThumbnails;
 937                 $this->skin = $wgUser->getSkin();
 938                 $this->current = $imagePage->getFile();
 939                 $this->img = $imagePage->getDisplayedFile();
 940                 $this->title = $imagePage->getTitle();
 941                 $this->imagePage = $imagePage;
 942                 $this->showThumb = $wgShowArchiveThumbnails && $this->img->canRender();
 943         }
 944
 945         public function getImagePage() {
 946                 return $this->imagePage;
 947         }
 948
 949         public function getSkin() {
 950                 return $this->skin;
 951         }
 952
 953         public function getFile() {
 954                 return $this->img;
 955         }
 956
 957         public function beginImageHistoryList( $navLinks = '' ) {
 958                 global $wgOut, $wgUser;
 959                 return Xml::element( 'h2', array( 'id' => 'filehistory' ), wfMsg( 'filehist' ) ) . "\n"
 960                         . "<div id=\"mw-imagepage-section-filehistory\">\n"
 961                         . $wgOut->parse( wfMsgNoTrans( 'filehist-help' ) )
 962                         . $navLinks . "\n"
 963                         . Xml::openElement( 'table', array( 'class' => 'wikitable filehistory' ) ) . "\n"
 964                         . '<tr><td></td>'
 965                         . ( $this->current->isLocal() && ( $wgUser->isAllowedAny( 'delete', 'deletedhistory' ) ) ? '<td></td>' : '' )
 966                         . '<th>' . wfMsgHtml( 'filehist-datetime' ) . '</th>'
 967                         . ( $this->showThumb ? '<th>' . wfMsgHtml( 'filehist-thumb' ) . '</th>' : '' )
 968                         . '<th>' . wfMsgHtml( 'filehist-dimensions' ) . '</th>'
 969                         . '<th>' . wfMsgHtml( 'filehist-user' ) . '</th>'
 970                         . '<th>' . wfMsgHtml( 'filehist-comment' ) . '</th>'
 971                         . "</tr>\n";
 972         }
 973
 974         public function endImageHistoryList( $navLinks = '' ) {
 975                 return "</table>\n$navLinks\n</div>\n";
 976         }
 977
 978         /**
 979          * @param $iscur
 980          * @param $file File
 981          * @return string
 982          */
 983         public function imageHistoryLine( $iscur, $file ) {
 984                 global $wgUser, $wgLang;
 985
 986                 $timestamp = wfTimestamp( TS_MW, $file->getTimestamp() );
 987                 $img = $iscur ? $file->getName() : $file->getArchiveName();
 988                 $user = $file->getUser( 'id' );
 989                 $usertext = $file->getUser( 'text' );
 990                 $description = $file->getDescription();
 991
 992                 $local = $this->current->isLocal();
 993                 $row = $selected = '';
 994
 995                 // Deletion link
 996                 if ( $local && ( $wgUser->isAllowedAny( 'delete', 'deletedhistory' ) ) ) {
 997                         $row .= '<td>';
 998                         # Link to remove from history
 999                         if ( $wgUser->isAllowed( 'delete' ) ) {
1000                                 $q = array( 'action' => 'delete' );
1001                                 if ( !$iscur ) {
1002                                         $q['oldimage'] = $img;
1003                                 }
1004                                 $row .= $this->skin->link(
1005                                         $this->title,
1006                                         wfMsgHtml( $iscur ? 'filehist-deleteall' : 'filehist-deleteone' ),
1007                                         array(), $q, array( 'known' )
1008                                 );
1009                         }
1010                         # Link to hide content. Don't show useless link to people who cannot hide revisions.
1011                         $canHide = $wgUser->isAllowed( 'deleterevision' );
1012                         if ( $canHide || ( $wgUser->isAllowed( 'deletedhistory' ) && $file->getVisibility() ) ) {
1013                                 if ( $wgUser->isAllowed( 'delete' ) ) {
1014                                         $row .= '<br />';
1015                                 }
1016                                 // If file is top revision or locked from this user, don't link
1017                                 if ( $iscur || !$file->userCan( File::DELETED_RESTRICTED ) ) {
1018                                         $del = $this->skin->revDeleteLinkDisabled( $canHide );
1019                                 } else {
1020                                         list( $ts, $name ) = explode( '!', $img, 2 );
1021                                         $query = array(
1022                                                 'type'   => 'oldimage',
1023                                                 'target' => $this->title->getPrefixedText(),
1024                                                 'ids'    => $ts,
1025                                         );
1026                                         $del = $this->skin->revDeleteLink( $query,
1027                                                 $file->isDeleted( File::DELETED_RESTRICTED ), $canHide );
1028                                 }
1029                                 $row .= $del;
1030                         }
1031                         $row .= '</td>';
1032                 }
1033
1034                 // Reversion link/current indicator
1035                 $row .= '<td>';
1036                 if ( $iscur ) {
1037                         $row .= wfMsgHtml( 'filehist-current' );
1038                 } elseif ( $local && $wgUser->isLoggedIn() && $this->title->userCan( 'edit' ) ) {
1039                         if ( $file->isDeleted( File::DELETED_FILE ) ) {
1040                                 $row .= wfMsgHtml( 'filehist-revert' );
1041                         } else {
1042                                 $row .= $this->skin->link(
1043                                         $this->title,
1044                                         wfMsgHtml( 'filehist-revert' ),
1045                                         array(),
1046                                         array(
1047                                                 'action' => 'revert',
1048                                                 'oldimage' => $img,
1049                                                 'wpEditToken' => $wgUser->editToken( $img )
1050                                         ),
1051                                         array( 'known', 'noclasses' )
1052                                 );
1053                         }
1054                 }
1055                 $row .= '</td>';
1056
1057                 // Date/time and image link
1058                 if ( $file->getTimestamp() === $this->img->getTimestamp() ) {
1059                         $selected = "class='filehistory-selected'";
1060                 }
1061                 $row .= "<td $selected style='white-space: nowrap;'>";
1062                 if ( !$file->userCan( File::DELETED_FILE ) ) {
1063                         # Don't link to unviewable files
1064                         $row .= '<span class="history-deleted">' . $wgLang->timeAndDate( $timestamp, true ) . '</span>';
1065                 } elseif ( $file->isDeleted( File::DELETED_FILE ) ) {
1066                         if ( $local ) {
1067                                 $this->preventClickjacking();
1068                                 $revdel = SpecialPage::getTitleFor( 'Revisiondelete' );
1069                                 # Make a link to review the image
1070                                 $url = $this->skin->link(
1071                                         $revdel,
1072                                         $wgLang->timeAndDate( $timestamp, true ),
1073                                         array(),
1074                                         array(
1075                                                 'target' => $this->title->getPrefixedText(),
1076                                                 'file' => $img,
1077                                                 'token' => $wgUser->editToken( $img )
1078                                         ),
1079                                         array( 'known', 'noclasses' )
1080                                 );
1081                         } else {
1082                                 $url = $wgLang->timeAndDate( $timestamp, true );
1083                         }
1084                         $row .= '<span class="history-deleted">' . $url . '</span>';
1085                 } else {
1086                         $url = $iscur ? $this->current->getUrl() : $this->current->getArchiveUrl( $img );
1087                         $row .= Xml::element( 'a', array( 'href' => $url ), $wgLang->timeAndDate( $timestamp, true ) );
1088                 }
1089                 $row .= "</td>";
1090
1091                 // Thumbnail
1092                 if ( $this->showThumb ) {
1093                         $row .= '<td>' . $this->getThumbForLine( $file ) . '</td>';
1094                 }
1095
1096                 // Image dimensions + size
1097                 $row .= '<td>';
1098                 $row .= htmlspecialchars( $file->getDimensionsString() );
1099                 $row .= ' <span style="white-space: nowrap;">(' . $this->skin->formatSize( $file->getSize() ) . ')</span>';
1100                 $row .= '</td>';
1101
1102                 // Uploading user
1103                 $row .= '<td>';
1104                 // Hide deleted usernames
1105                 if ( $file->isDeleted( File::DELETED_USER ) ) {
1106                         $row .= '<span class="history-deleted">' . wfMsgHtml( 'rev-deleted-user' ) . '</span>';
1107                 } else {
1108                         if ( $local ) {
1109                                 $row .= $this->skin->userLink( $user, $usertext ) . ' <span style="white-space: nowrap;">' .
1110                                 $this->skin->userToolLinks( $user, $usertext ) . '</span>';
1111                         } else {
1112                                 $row .= htmlspecialchars( $usertext );
1113                         }
1114                 }
1115                 $row .= '</td><td>';
1116
1117                 // Don't show deleted descriptions
1118                 if ( $file->isDeleted( File::DELETED_COMMENT ) ) {
1119                         $row .= '<span class="history-deleted">' . wfMsgHtml( 'rev-deleted-comment' ) . '</span>';
1120                 } else {
1121                         $row .= $this->skin->commentBlock( $description, $this->title );
1122                 }
1123                 $row .= '</td>';
1124
1125                 $rowClass = null;
1126                 wfRunHooks( 'ImagePageFileHistoryLine', array( $this, $file, &$row, &$rowClass ) );
1127                 $classAttr = $rowClass ? " class='$rowClass'" : '';
1128
1129                 return "<tr{$classAttr}>{$row}</tr>\n";
1130         }
1131
1132         /**
1133          * @param $file File
1134          * @return string
1135          */
1136         protected function getThumbForLine( $file ) {
1137                 global $wgLang;
1138
1139                 if ( $file->allowInlineDisplay() && $file->userCan( File::DELETED_FILE ) && !$file->isDeleted( File::DELETED_FILE ) ) {
1140                         $params = array(
1141                                 'width' => '120',
1142                                 'height' => '120',
1143                         );
1144                         $timestamp = wfTimestamp( TS_MW, $file->getTimestamp() );
1145
1146                         $thumbnail = $file->transform( $params );
1147                         $options = array(
1148                                 'alt' => wfMsg( 'filehist-thumbtext',
1149                                         $wgLang->timeAndDate( $timestamp, true ),
1150                                         $wgLang->date( $timestamp, true ),
1151                                         $wgLang->time( $timestamp, true ) ),
1152                                 'file-link' => true,
1153                         );
1154
1155                         if ( !$thumbnail ) {
1156                                 return wfMsgHtml( 'filehist-nothumb' );
1157                         }
1158
1159                         return $thumbnail->toHtml( $options );
1160                 } else {
1161                         return wfMsgHtml( 'filehist-nothumb' );
1162                 }
1163         }
1164
1165         protected function preventClickjacking( $enable = true ) {
1166                 $this->preventClickjacking = $enable;
1167         }
1168
1169         public function getPreventClickjacking() {
1170                 return $this->preventClickjacking;
1171         }
1172 }
1173
1174 class ImageHistoryPseudoPager extends ReverseChronologicalPager {
1175         protected $preventClickjacking = false;
1176
1177         /**
1178          * @var File
1179          */
1180         protected $mImg;
1181
1182         /**
1183          * @var Title
1184          */
1185         protected $mTitle;
1186
1187         /**
1188          * @param ImagePage $imagePage
1189          */
1190         function __construct( $imagePage ) {
1191                 parent::__construct();
1192                 $this->mImagePage = $imagePage;
1193                 $this->mTitle = clone ( $imagePage->getTitle() );
1194                 $this->mTitle->setFragment( '#filehistory' );
1195                 $this->mImg = null;
1196                 $this->mHist = array();
1197                 $this->mRange = array( 0, 0 ); // display range
1198         }
1199
1200         function getTitle() {
1201                 return $this->mTitle;
1202         }
1203
1204         function getQueryInfo() {
1205                 return false;
1206         }
1207
1208         function getIndexField() {
1209                 return '';
1210         }
1211
1212         function formatRow( $row ) {
1213                 return '';
1214         }
1215
1216         function getBody() {
1217                 $s = '';
1218                 $this->doQuery();
1219                 if ( count( $this->mHist ) ) {
1220                         $list = new ImageHistoryList( $this->mImagePage );
1221                         # Generate prev/next links
1222                         $navLink = $this->getNavigationBar();
1223                         $s = $list->beginImageHistoryList( $navLink );
1224                         // Skip rows there just for paging links
1225                         for ( $i = $this->mRange[0]; $i <= $this->mRange[1]; $i++ ) {
1226                                 $file = $this->mHist[$i];
1227                                 $s .= $list->imageHistoryLine( !$file->isOld(), $file );
1228                         }
1229                         $s .= $list->endImageHistoryList( $navLink );
1230
1231                         if ( $list->getPreventClickjacking() ) {
1232                                 $this->preventClickjacking();
1233                         }
1234                 }
1235                 return $s;
1236         }
1237
1238         function doQuery() {
1239                 if ( $this->mQueryDone ) {
1240                         return;
1241                 }
1242                 $this->mImg = $this->mImagePage->getFile(); // ensure loading
1243                 if ( !$this->mImg->exists() ) {
1244                         return;
1245                 }
1246                 $queryLimit = $this->mLimit + 1; // limit plus extra row
1247                 if ( $this->mIsBackwards ) {
1248                         // Fetch the file history
1249                         $this->mHist = $this->mImg->getHistory( $queryLimit, null, $this->mOffset, false );
1250                         // The current rev may not meet the offset/limit
1251                         $numRows = count( $this->mHist );
1252                         if ( $numRows <= $this->mLimit && $this->mImg->getTimestamp() > $this->mOffset ) {
1253                                 $this->mHist = array_merge( array( $this->mImg ), $this->mHist );
1254                         }
1255                 } else {
1256                         // The current rev may not meet the offset
1257                         if ( !$this->mOffset || $this->mImg->getTimestamp() < $this->mOffset ) {
1258                                 $this->mHist[] = $this->mImg;
1259                         }
1260                         // Old image versions (fetch extra row for nav links)
1261                         $oiLimit = count( $this->mHist ) ? $this->mLimit : $this->mLimit + 1;
1262                         // Fetch the file history
1263                         $this->mHist = array_merge( $this->mHist,
1264                                 $this->mImg->getHistory( $oiLimit, $this->mOffset, null, false ) );
1265                 }
1266                 $numRows = count( $this->mHist ); // Total number of query results
1267                 if ( $numRows ) {
1268                         # Index value of top item in the list
1269                         $firstIndex = $this->mIsBackwards ?
1270                                 $this->mHist[$numRows - 1]->getTimestamp() : $this->mHist[0]->getTimestamp();
1271                         # Discard the extra result row if there is one
1272                         if ( $numRows > $this->mLimit && $numRows > 1 ) {
1273                                 if ( $this->mIsBackwards ) {
1274                                         # Index value of item past the index
1275                                         $this->mPastTheEndIndex = $this->mHist[0]->getTimestamp();
1276                                         # Index value of bottom item in the list
1277                                         $lastIndex = $this->mHist[1]->getTimestamp();
1278                                         # Display range
1279                                         $this->mRange = array( 1, $numRows - 1 );
1280                                 } else {
1281                                         # Index value of item past the index
1282                                         $this->mPastTheEndIndex = $this->mHist[$numRows - 1]->getTimestamp();
1283                                         # Index value of bottom item in the list
1284                                         $lastIndex = $this->mHist[$numRows - 2]->getTimestamp();
1285                                         # Display range
1286                                         $this->mRange = array( 0, $numRows - 2 );
1287                                 }
1288                         } else {
1289                                 # Setting indexes to an empty string means that they will be
1290                                 # omitted if they would otherwise appear in URLs. It just so
1291                                 # happens that this  is the right thing to do in the standard
1292                                 # UI, in all the relevant cases.
1293                                 $this->mPastTheEndIndex = '';
1294                                 # Index value of bottom item in the list
1295                                 $lastIndex = $this->mIsBackwards ?
1296                                         $this->mHist[0]->getTimestamp() : $this->mHist[$numRows - 1]->getTimestamp();
1297                                 # Display range
1298                                 $this->mRange = array( 0, $numRows - 1 );
1299                         }
1300                 } else {
1301                         $firstIndex = '';
1302                         $lastIndex = '';
1303                         $this->mPastTheEndIndex = '';
1304                 }
1305                 if ( $this->mIsBackwards ) {
1306                         $this->mIsFirst = ( $numRows < $queryLimit );
1307                         $this->mIsLast = ( $this->mOffset == '' );
1308                         $this->mLastShown = $firstIndex;
1309                         $this->mFirstShown = $lastIndex;
1310                 } else {
1311                         $this->mIsFirst = ( $this->mOffset == '' );
1312                         $this->mIsLast = ( $numRows < $queryLimit );
1313                         $this->mLastShown = $lastIndex;
1314                         $this->mFirstShown = $firstIndex;
1315                 }
1316                 $this->mQueryDone = true;
1317         }
1318
1319         protected function preventClickjacking( $enable = true ) {
1320                 $this->preventClickjacking = $enable;
1321         }
1322
1323         public function getPreventClickjacking() {
1324                 return $this->preventClickjacking;
1325         }
1326
1327 }