ImagePage.php

Go to the documentation of this file.

<?php
class ImagePage extends Article {

        private $displayImg;
        private $repo;
        private $fileLoaded;

        var $mExtraDescription = false;

        protected function newPage( Title $title ) {
                // Overload mPage with a file-specific page
                return new WikiFilePage( $title );
        }

        public static function newFromID( $id ) {
                $t = Title::newFromID( $id );
                # @todo FIXME: Doesn't inherit right
                return $t == null ? null : new self( $t );
                # return $t == null ? null : new static( $t ); // PHP 5.3
        }

        public function setFile( $file ) {
                $this->mPage->setFile( $file );
                $this->displayImg = $file;
                $this->fileLoaded = true;
        }

        protected function loadFile() {
                if ( $this->fileLoaded ) {
                        return;
                }
                $this->fileLoaded = true;

                $this->displayImg = $img = false;
                wfRunHooks( 'ImagePageFindFile', array( $this, &$img, &$this->displayImg ) );
                if ( !$img ) { // not set by hook?
                        $img = wfFindFile( $this->getTitle() );
                        if ( !$img ) {
                                $img = wfLocalFile( $this->getTitle() );
                        }
                }
                $this->mPage->setFile( $img );
                if ( !$this->displayImg ) { // not set by hook?
                        $this->displayImg = $img;
                }
                $this->repo = $img->getRepo();
        }

        public function render() {
                $this->getContext()->getOutput()->setArticleBodyOnly( true );
                parent::view();
        }

        public function view() {
                global $wgShowEXIF;

                $out = $this->getContext()->getOutput();
                $request = $this->getContext()->getRequest();
                $diff = $request->getVal( 'diff' );
                $diffOnly = $request->getBool( 'diffonly', $this->getContext()->getUser()->getOption( 'diffonly' ) );

                if ( $this->getTitle()->getNamespace() != NS_FILE || ( isset( $diff ) && $diffOnly ) ) {
                        parent::view();
                        return;
                }

                $this->loadFile();

                if ( $this->getTitle()->getNamespace() == NS_FILE && $this->mPage->getFile()->getRedirected() ) {
                        if ( $this->getTitle()->getDBkey() == $this->mPage->getFile()->getName() || isset( $diff ) ) {
                                // mTitle is the same as the redirect target so ask Article
                                // to perform the redirect for us.
                                $request->setVal( 'diffonly', 'true' );
                                parent::view();
                                return;
                        } else {
                                // mTitle is not the same as the redirect target so it is
                                // probably the redirect page itself. Fake the redirect symbol
                                $out->setPageTitle( $this->getTitle()->getPrefixedText() );
                                $out->addHTML( $this->viewRedirect( Title::makeTitle( NS_FILE, $this->mPage->getFile()->getName() ),
                                        /* $appendSubtitle */ true, /* $forceKnown */ true ) );
                                $this->mPage->doViewUpdates( $this->getContext()->getUser() );
                                return;
                        }
                }

                if ( $wgShowEXIF && $this->displayImg->exists() ) {
                        // @todo FIXME: Bad interface, see note on MediaHandler::formatMetadata().
                        $formattedMetadata = $this->displayImg->formatMetadata();
                        $showmeta = $formattedMetadata !== false;
                } else {
                        $showmeta = false;
                }

                if ( !$diff && $this->displayImg->exists() ) {
                        $out->addHTML( $this->showTOC( $showmeta ) );
                }

                if ( !$diff ) {
                        $this->openShowImage();
                }

                # No need to display noarticletext, we use our own message, output in openShowImage()
                if ( $this->mPage->getID() ) {
                        # NS_FILE is in the user language, but this section (the actual wikitext)
                        # should be in page content language
                        $pageLang = $this->getTitle()->getPageViewLanguage();
                        $out->addHTML( Xml::openElement( 'div', array( 'id' => 'mw-imagepage-content',
                                'lang' => $pageLang->getHtmlCode(), 'dir' => $pageLang->getDir(),
                                'class' => 'mw-content-'.$pageLang->getDir() ) ) );
                        parent::view();
                        $out->addHTML( Xml::closeElement( 'div' ) );
                } else {
                        # Just need to set the right headers
                        $out->setArticleFlag( true );
                        $out->setPageTitle( $this->getTitle()->getPrefixedText() );
                        $this->mPage->doViewUpdates( $this->getContext()->getUser() );
                }

                # Show shared description, if needed
                if ( $this->mExtraDescription ) {
                        $fol = wfMessage( 'shareddescriptionfollows' );
                        if ( !$fol->isDisabled() ) {
                                $out->addWikiText( $fol->plain() );
                        }
                        $out->addHTML( '<div id="shared-image-desc">' . $this->mExtraDescription . "</div>\n" );
                }

                $this->closeShowImage();
                $this->imageHistory();
                // TODO: Cleanup the following

                $out->addHTML( Xml::element( 'h2',
                        array( 'id' => 'filelinks' ),
                        wfMessage( 'imagelinks' )->text() ) . "\n" );
                $this->imageDupes();
                # @todo FIXME: For some freaky reason, we can't redirect to foreign images.
                # Yet we return metadata about the target. Definitely an issue in the FileRepo
                $this->imageLinks();

                # Allow extensions to add something after the image links
                $html = '';
                wfRunHooks( 'ImagePageAfterImageLinks', array( $this, &$html ) );
                if ( $html ) {
                        $out->addHTML( $html );
                }

                if ( $showmeta ) {
                        $out->addHTML( Xml::element(
                                'h2',
                                array( 'id' => 'metadata' ),
                                wfMessage( 'metadata' )->text() ) . "\n" );
                        $out->addWikiText( $this->makeMetadataTable( $formattedMetadata ) );
                        $out->addModules( array( 'mediawiki.action.view.metadata' ) );
                }

                // Add remote Filepage.css
                if( !$this->repo->isLocal() ) {
                        $css = $this->repo->getDescriptionStylesheetUrl();
                        if ( $css ) {
                                $out->addStyle( $css );
                        }
                }
                // always show the local local Filepage.css, bug 29277
                $out->addModuleStyles( 'filepage' );
        }

        public function getDisplayedFile() {
                $this->loadFile();
                return $this->displayImg;
        }

        protected function showTOC( $metadata ) {
                $r = array(
                        '<li><a href="#file">' . wfMessage( 'file-anchor-link' )->escaped() . '</a></li>',
                        '<li><a href="#filehistory">' . wfMessage( 'filehist' )->escaped() . '</a></li>',
                        '<li><a href="#filelinks">' . wfMessage( 'imagelinks' )->escaped() . '</a></li>',
                );
                if ( $metadata ) {
                        $r[] = '<li><a href="#metadata">' . wfMessage( 'metadata' )->escaped() . '</a></li>';
                }

                wfRunHooks( 'ImagePageShowTOC', array( $this, &$r ) );

                return '<ul id="filetoc">' . implode( "\n", $r ) . '</ul>';
        }

        protected function makeMetadataTable( $metadata ) {
                $r = "<div class=\"mw-imagepage-section-metadata\">";
                $r .= wfMessage( 'metadata-help' )->plain();
                $r .= "<table id=\"mw_metadata\" class=\"mw_metadata\">\n";
                foreach ( $metadata as $type => $stuff ) {
                        foreach ( $stuff as $v ) {
                                # @todo FIXME: Why is this using escapeId for a class?!
                                $class = Sanitizer::escapeId( $v['id'] );
                                if ( $type == 'collapsed' ) {
                                        $class .= ' collapsable';
                                }
                                $r .= "<tr class=\"$class\">\n";
                                $r .= "<th>{$v['name']}</th>\n";
                                $r .= "<td>{$v['value']}</td>\n</tr>";
                        }
                }
                $r .= "</table>\n</div>\n";
                return $r;
        }

        public function getContent() {
                $this->loadFile();
                if ( $this->mPage->getFile() && !$this->mPage->getFile()->isLocal() && 0 == $this->getID() ) {
                        return '';
                }
                return parent::getContent();
        }

        protected function openShowImage() {
                global $wgImageLimits, $wgEnableUploads, $wgSend404Code;

                $this->loadFile();
                $out = $this->getContext()->getOutput();
                $user = $this->getContext()->getUser();
                $lang = $this->getContext()->getLanguage();
                $dirmark = $lang->getDirMarkEntity();
                $request = $this->getContext()->getRequest();

                $sizeSel = intval( $user->getOption( 'imagesize' ) );
                if ( !isset( $wgImageLimits[$sizeSel] ) ) {
                        $sizeSel = User::getDefaultOption( 'imagesize' );

                        // The user offset might still be incorrect, specially if
                        // $wgImageLimits got changed (see bug #8858).
                        if ( !isset( $wgImageLimits[$sizeSel] ) ) {
                                // Default to the first offset in $wgImageLimits
                                $sizeSel = 0;
                        }
                }
                $max = $wgImageLimits[$sizeSel];
                $maxWidth = $max[0];
                $maxHeight = $max[1];

                if ( $this->displayImg->exists() ) {
                        # image
                        $page = $request->getIntOrNull( 'page' );
                        if ( is_null( $page ) ) {
                                $params = array();
                                $page = 1;
                        } else {
                                $params = array( 'page' => $page );
                        }
                        $width_orig = $this->displayImg->getWidth( $page );
                        $width = $width_orig;
                        $height_orig = $this->displayImg->getHeight( $page );
                        $height = $height_orig;

                        $longDesc = wfMessage( 'parentheses', $this->displayImg->getLongDesc() )->text();

                        wfRunHooks( 'ImageOpenShowImageInlineBefore', array( &$this, &$out ) );

                        if ( $this->displayImg->allowInlineDisplay() ) {
                                # image

                                # "Download high res version" link below the image
                                # $msgsize = wfMessage( 'file-info-size', $width_orig, $height_orig, Linker::formatSize( $this->displayImg->getSize() ), $mime )->escaped();
                                # We'll show a thumbnail of this image
                                if ( $width > $maxWidth || $height > $maxHeight ) {
                                        # Calculate the thumbnail size.
                                        # First case, the limiting factor is the width, not the height.
                                        if ( $width / $height >= $maxWidth / $maxHeight ) {
                                                $height = round( $height * $maxWidth / $width );
                                                $width = $maxWidth;
                                                # Note that $height <= $maxHeight now.
                                        } else {
                                                $newwidth = floor( $width * $maxHeight / $height );
                                                $height = round( $height * $newwidth / $width );
                                                $width = $newwidth;
                                                # Note that $height <= $maxHeight now, but might not be identical
                                                # because of rounding.
                                        }
                                        $msgbig = wfMessage( 'show-big-image' )->escaped();
                                        if ( $this->displayImg->getRepo()->canTransformVia404() ) {
                                                $thumbSizes = $wgImageLimits;
                                        } else {
                                                # Creating thumb links triggers thumbnail generation.
                                                # Just generate the thumb for the current users prefs.
                                                $thumbOption = $user->getOption( 'thumbsize' );
                                                $thumbSizes = array( isset( $wgImageLimits[$thumbOption] )
                                                        ? $wgImageLimits[$thumbOption]
                                                        : $wgImageLimits[User::getDefaultOption( 'thumbsize' )] );
                                        }
                                        # Generate thumbnails or thumbnail links as needed...
                                        $otherSizes = array();
                                        foreach ( $thumbSizes as $size ) {
                                                if ( $size[0] < $width_orig && $size[1] < $height_orig
                                                        && $size[0] != $width && $size[1] != $height )
                                                {
                                                        $otherSizes[] = $this->makeSizeLink( $params, $size[0], $size[1] );
                                                }
                                        }
                                        $msgsmall = wfMessage( 'show-big-image-preview' )->
                                                rawParams( $this->makeSizeLink( $params, $width, $height ) )->
                                                parse();
                                        if ( count( $otherSizes ) ) {
                                                $msgsmall .= ' ' .
                                                Html::rawElement( 'span', array( 'class' => 'mw-filepage-other-resolutions' ),
                                                        wfMessage( 'show-big-image-other' )->rawParams( $lang->pipeList( $otherSizes ) )->
                                                        params( count( $otherSizes ) )->parse()
                                                );
                                        }
                                } elseif ( $width == 0 && $height == 0 ){
                                        # Some sort of audio file that doesn't have dimensions
                                        # Don't output a no hi res message for such a file
                                        $msgsmall = '';
                                } elseif ( $this->displayImg->isVectorized() ) {
                                        # For vectorized images, full size is just the frame size
                                        $msgsmall = '';
                                } else {
                                        # Image is small enough to show full size on image page
                                        $msgsmall = wfMessage( 'file-nohires' )->parse();
                                }

                                $params['width'] = $width;
                                $params['height'] = $height;
                                $thumbnail = $this->displayImg->transform( $params );

                                $showLink = true;
                                $anchorclose = Html::rawElement( 'div', array( 'class' => 'mw-filepage-resolutioninfo' ), $msgsmall );

                                $isMulti = $this->displayImg->isMultipage() && $this->displayImg->pageCount() > 1;
                                if ( $isMulti ) {
                                        $out->addHTML( '<table class="multipageimage"><tr><td>' );
                                }

                                if ( $thumbnail ) {
                                        $options = array(
                                                'alt' => $this->displayImg->getTitle()->getPrefixedText(),
                                                'file-link' => true,
                                        );
                                        $out->addHTML( '<div class="fullImageLink" id="file">' .
                                                $thumbnail->toHtml( $options ) .
                                                $anchorclose . "</div>\n" );
                                }

                                if ( $isMulti ) {
                                        $count = $this->displayImg->pageCount();

                                        if ( $page > 1 ) {
                                                $label = $out->parse( wfMessage( 'imgmultipageprev' )->text(), false );
                                                $link = Linker::linkKnown(
                                                        $this->getTitle(),
                                                        $label,
                                                        array(),
                                                        array( 'page' => $page - 1 )
                                                );
                                                $thumb1 = Linker::makeThumbLinkObj( $this->getTitle(), $this->displayImg, $link, $label, 'none',
                                                        array( 'page' => $page - 1 ) );
                                        } else {
                                                $thumb1 = '';
                                        }

                                        if ( $page < $count ) {
                                                $label = wfMessage( 'imgmultipagenext' )->text();
                                                $link = Linker::linkKnown(
                                                        $this->getTitle(),
                                                        $label,
                                                        array(),
                                                        array( 'page' => $page + 1 )
                                                );
                                                $thumb2 = Linker::makeThumbLinkObj( $this->getTitle(), $this->displayImg, $link, $label, 'none',
                                                        array( 'page' => $page + 1 ) );
                                        } else {
                                                $thumb2 = '';
                                        }

                                        global $wgScript;

                                        $formParams = array(
                                                'name' => 'pageselector',
                                                'action' => $wgScript,
                                                'onchange' => 'document.pageselector.submit();',
                                        );
                                        $options = array();
                                        for ( $i = 1; $i <= $count; $i++ ) {
                                                $options[] = Xml::option( $lang->formatNum( $i ), $i, $i == $page );
                                        }
                                        $select = Xml::tags( 'select',
                                                array( 'id' => 'pageselector', 'name' => 'page' ),
                                                implode( "\n", $options ) );

                                        $out->addHTML(
                                                '</td><td><div class="multipageimagenavbox">' .
                                                Xml::openElement( 'form', $formParams ) .
                                                Html::hidden( 'title', $this->getTitle()->getPrefixedDBkey() ) .
                                                        wfMessage( 'imgmultigoto' )->rawParams( $select )->parse() .
                                                Xml::submitButton( wfMessage( 'imgmultigo' )->text() ) .
                                                Xml::closeElement( 'form' ) .
                                                "<hr />$thumb1\n$thumb2<br style=\"clear: both\" /></div></td></tr></table>"
                                        );
                                }
                        } else {
                                # if direct link is allowed but it's not a renderable image, show an icon.
                                if ( $this->displayImg->isSafeFile() ) {
                                        $icon = $this->displayImg->iconThumb();

                                        $out->addHTML( '<div class="fullImageLink" id="file">' .
                                                $icon->toHtml( array( 'file-link' => true ) ) .
                                                "</div>\n" );
                                }

                                $showLink = true;
                        }

                        if ( $showLink ) {
                                $filename = wfEscapeWikiText( $this->displayImg->getName() );
                                $linktext = $filename;
                                if ( isset( $msgbig ) ) {
                                        $linktext = wfEscapeWikiText( $msgbig );
                                }
                                $medialink = "[[Media:$filename|$linktext]]";

                                if ( !$this->displayImg->isSafeFile() ) {
                                        $warning = wfMessage( 'mediawarning' )->plain();
                                        // dirmark is needed here to separate the file name, which
                                        // most likely ends in Latin characters, from the description,
                                        // which may begin with the file type. In RTL environment
                                        // this will get messy.
                                        // The dirmark, however, must not be immediately adjacent
                                        // to the filename, because it can get copied with it.
                                        // See bug 25277.
                                        $out->addWikiText( <<<EOT
<div class="fullMedia"><span class="dangerousLink">{$medialink}</span> $dirmark<span class="fileInfo">$longDesc</span></div>
<div class="mediaWarning">$warning</div>
EOT
                                                );
                                } else {
                                        $out->addWikiText( <<<EOT
<div class="fullMedia">{$medialink} {$dirmark}<span class="fileInfo">$longDesc</span>
</div>
EOT
                                        );
                                }
                        }

                        // Add cannot animate thumbnail warning
                        if ( !$this->displayImg->canAnimateThumbIfAppropriate() ) {
                                // Include the extension so wiki admins can
                                // customize it on a per file-type basis
                                // (aka say things like use format X instead).
                                // additionally have a specific message for
                                // file-no-thumb-animation-gif
                                $ext = $this->displayImg->getExtension();
                                $noAnimMesg = wfMessageFallback(
                                        'file-no-thumb-animation-' . $ext,
                                        'file-no-thumb-animation'
                                )->plain();

                                $out->addWikiText( <<<EOT
<div class="mw-noanimatethumb">{$noAnimMesg}</div>
EOT
                                );
                        }

                        if ( !$this->displayImg->isLocal() ) {
                                $this->printSharedImageText();
                        }
                } else {
                        # Image does not exist
                        if ( !$this->getID() ) {
                                # No article exists either
                                # Show deletion log to be consistent with normal articles
                                LogEventsList::showLogExtract(
                                        $out,
                                        array( 'delete', 'move' ),
                                        $this->getTitle()->getPrefixedText(),
                                        '',
                                        array(  'lim' => 10,
                                                'conds' => array( "log_action != 'revision'" ),
                                                'showIfEmpty' => false,
                                                'msgKey' => array( 'moveddeleted-notice' )
                                        )
                                );
                        }

                        if ( $wgEnableUploads && $user->isAllowed( 'upload' ) ) {
                                // Only show an upload link if the user can upload
                                $uploadTitle = SpecialPage::getTitleFor( 'Upload' );
                                $nofile = array(
                                        'filepage-nofile-link',
                                        $uploadTitle->getFullURL( array( 'wpDestFile' => $this->mPage->getFile()->getName() ) )
                                );
                        } else {
                                $nofile = 'filepage-nofile';
                        }
                        // Note, if there is an image description page, but
                        // no image, then this setRobotPolicy is overriden
                        // by Article::View().
                        $out->setRobotPolicy( 'noindex,nofollow' );
                        $out->wrapWikiMsg( "<div id='mw-imagepage-nofile' class='plainlinks'>\n$1\n</div>", $nofile );
                        if ( !$this->getID() && $wgSend404Code ) {
                                // If there is no image, no shared image, and no description page,
                                // output a 404, to be consistent with articles.
                                $request->response()->header( 'HTTP/1.1 404 Not Found' );
                        }
                }
                $out->setFileVersion( $this->displayImg );
        }

        private function makeSizeLink( $params, $width, $height ) {
                $params['width'] = $width;
                $params['height'] = $height;
                $thumbnail = $this->displayImg->transform( $params );
                if ( $thumbnail && !$thumbnail->isError() ) {
                        return Html::rawElement( 'a', array(
                                'href' => $thumbnail->getUrl(),
                                'class' => 'mw-thumbnail-link'
                                ), wfMessage( 'show-big-image-size' )->numParams(
                                        $thumbnail->getWidth(), $thumbnail->getHeight()
                                )->parse() );
                } else {
                        return '';
                }
        }

        protected function printSharedImageText() {
                $out = $this->getContext()->getOutput();
                $this->loadFile();

                $descUrl = $this->mPage->getFile()->getDescriptionUrl();
                $descText = $this->mPage->getFile()->getDescriptionText();

                /* Add canonical to head if there is no local page for this shared file */
                if( $descUrl && $this->mPage->getID() == 0 ) {
                        $out->addLink( array( 'rel' => 'canonical', 'href' => $descUrl ) );
                }

                $wrap = "<div class=\"sharedUploadNotice\">\n$1\n</div>\n";
                $repo = $this->mPage->getFile()->getRepo()->getDisplayName();

                if ( $descUrl && $descText && wfMessage( 'sharedupload-desc-here' )->plain() !== '-'  ) {
                        $out->wrapWikiMsg( $wrap, array( 'sharedupload-desc-here', $repo, $descUrl ) );
                } elseif ( $descUrl && wfMessage( 'sharedupload-desc-there' )->plain() !== '-' ) {
                        $out->wrapWikiMsg( $wrap, array( 'sharedupload-desc-there', $repo, $descUrl ) );
                } else {
                        $out->wrapWikiMsg( $wrap, array( 'sharedupload', $repo ), ''/*BACKCOMPAT*/ );
                }

                if ( $descText ) {
                        $this->mExtraDescription = $descText;
                }
        }

        public function getUploadUrl() {
                $this->loadFile();
                $uploadTitle = SpecialPage::getTitleFor( 'Upload' );
                return $uploadTitle->getFullURL( array(
                        'wpDestFile' => $this->mPage->getFile()->getName(),
                        'wpForReUpload' => 1
                 ) );
        }

        protected function uploadLinksBox() {
                global $wgEnableUploads, $wgUseExternalEditor;

                if ( !$wgEnableUploads ) {
                        return;
                }

                $this->loadFile();
                if ( !$this->mPage->getFile()->isLocal() ) {
                        return;
                }

                $out = $this->getContext()->getOutput();
                $out->addHTML( "<ul>\n" );

                # "Upload a new version of this file" link
                $canUpload = $this->getTitle()->userCan( 'upload', $this->getContext()->getUser() );
                if ( $canUpload && UploadBase::userCanReUpload( $this->getContext()->getUser(), $this->mPage->getFile()->name ) ) {
                        $ulink = Linker::makeExternalLink( $this->getUploadUrl(), wfMessage( 'uploadnewversion-linktext' )->text() );
                        $out->addHTML( "<li id=\"mw-imagepage-reupload-link\"><div class=\"plainlinks\">{$ulink}</div></li>\n" );
                } else {
                        $out->addHTML( "<li id=\"mw-imagepage-upload-disallowed\">" . $this->getContext()->msg( 'upload-disallowed-here' )->escaped() . "</li>\n" );
                }

                # External editing link
                if ( $wgUseExternalEditor ) {
                        $elink = Linker::linkKnown(
                                $this->getTitle(),
                                wfMessage( 'edit-externally' )->escaped(),
                                array(),
                                array(
                                        'action' => 'edit',
                                        'externaledit' => 'true',
                                        'mode' => 'file'
                                )
                        );
                        $out->addHTML(
                                '<li id="mw-imagepage-edit-external">' . $elink . ' <small>' .
                                        wfMessage( 'edit-externally-help' )->parse() .
                                        "</small></li>\n"
                        );
                }

                $out->addHTML( "</ul>\n" );
        }

        protected function closeShowImage() { } # For overloading

        protected function imageHistory() {
                $this->loadFile();
                $out = $this->getContext()->getOutput();
                $pager = new ImageHistoryPseudoPager( $this );
                $out->addHTML( $pager->getBody() );
                $out->preventClickjacking( $pager->getPreventClickjacking() );

                $this->mPage->getFile()->resetHistory(); // free db resources

                # Exist check because we don't want to show this on pages where an image
                # doesn't exist along with the noimage message, that would suck. -ævar
                if ( $this->mPage->getFile()->exists() ) {
                        $this->uploadLinksBox();
                }
        }

        protected function queryImageLinks( $target, $limit ) {
                $dbr = wfGetDB( DB_SLAVE );

                return $dbr->select(
                        array( 'imagelinks', 'page' ),
                        array( 'page_namespace', 'page_title', 'page_is_redirect', 'il_to' ),
                        array( 'il_to' => $target, 'il_from = page_id' ),
                        __METHOD__,
                        array( 'LIMIT' => $limit + 1, 'ORDER BY' => 'il_from', )
                );
        }

        protected function imageLinks() {
                $limit = 100;

                $out = $this->getContext()->getOutput();
                $res = $this->queryImageLinks( $this->getTitle()->getDbKey(), $limit + 1);
                $rows = array();
                $redirects = array();
                foreach ( $res as $row ) {
                        if ( $row->page_is_redirect ) {
                                $redirects[$row->page_title] = array();
                        }
                        $rows[] = $row;
                }
                $count = count( $rows );

                $hasMore = $count > $limit;
                if ( !$hasMore && count( $redirects ) ) {
                        $res = $this->queryImageLinks( array_keys( $redirects ),
                                $limit - count( $rows ) + 1 );
                        foreach ( $res as $row ) {
                                $redirects[$row->il_to][] = $row;
                                $count++;
                        }
                        $hasMore = ( $res->numRows() + count( $rows ) ) > $limit;
                }

                if ( $count == 0 ) {
                        $out->wrapWikiMsg(
                                Html::rawElement( 'div',
                                        array( 'id' => 'mw-imagepage-nolinkstoimage' ), "\n$1\n" ),
                                'nolinkstoimage'
                        );
                        return;
                }

                $out->addHTML( "<div id='mw-imagepage-section-linkstoimage'>\n" );
                if ( !$hasMore ) {
                        $out->addWikiMsg( 'linkstoimage', $count );
                } else {
                        // More links than the limit. Add a link to [[Special:Whatlinkshere]]
                        $out->addWikiMsg( 'linkstoimage-more',
                                $this->getContext()->getLanguage()->formatNum( $limit ),
                                $this->getTitle()->getPrefixedDBkey()
                        );
                }

                $out->addHTML(
                        Html::openElement( 'ul',
                                array( 'class' => 'mw-imagepage-linkstoimage' ) ) . "\n"
                );
                $count = 0;

                // Sort the list by namespace:title
                usort( $rows, array( $this, 'compare' ) );

                // Create links for every element
                $currentCount = 0;
                foreach( $rows as $element ) {
                        $currentCount++;
                        if ( $currentCount > $limit ) {
                                break;
                        }

                        $link = Linker::linkKnown( Title::makeTitle( $element->page_namespace, $element->page_title ) );
                        if ( !isset( $redirects[$element->page_title] ) ) {
                                $liContents = $link;
                        } else {
                                $ul = "<ul class='mw-imagepage-redirectstofile'>\n";
                                foreach ( $redirects[$element->page_title] as $row ) {
                                        $currentCount++;
                                        if ( $currentCount > $limit ) {
                                                break;
                                        }

                                        $link2 = Linker::linkKnown( Title::makeTitle( $row->page_namespace, $row->page_title ) );
                                        $ul .= Html::rawElement(
                                                'li',
                                                array( 'class' => 'mw-imagepage-linkstoimage-ns' . $element->page_namespace ),
                                                $link2
                                                ) . "\n";
                                }
                                $ul .= '</ul>';
                                $liContents = wfMessage( 'linkstoimage-redirect' )->rawParams(
                                        $link, $ul )->parse();
                        }
                        $out->addHTML( Html::rawElement(
                                        'li',
                                        array( 'class' => 'mw-imagepage-linkstoimage-ns' . $element->page_namespace ),
                                        $liContents
                                ) . "\n"
                        );

                };
                $out->addHTML( Html::closeElement( 'ul' ) . "\n" );
                $res->free();

                // Add a links to [[Special:Whatlinkshere]]
                if ( $count > $limit ) {
                        $out->addWikiMsg( 'morelinkstoimage', $this->getTitle()->getPrefixedDBkey() );
                }
                $out->addHTML( Html::closeElement( 'div' ) . "\n" );
        }

        protected function imageDupes() {
                $this->loadFile();
                $out = $this->getContext()->getOutput();

                $dupes = $this->mPage->getDuplicates();
                if ( count( $dupes ) == 0 ) {
                        return;
                }

                $out->addHTML( "<div id='mw-imagepage-section-duplicates'>\n" );
                $out->addWikiMsg( 'duplicatesoffile',
                        $this->getContext()->getLanguage()->formatNum( count( $dupes ) ), $this->getTitle()->getDBkey()
                );
                $out->addHTML( "<ul class='mw-imagepage-duplicates'>\n" );

                foreach ( $dupes as $file ) {
                        $fromSrc = '';
                        if ( $file->isLocal() ) {
                                $link = Linker::linkKnown( $file->getTitle() );
                        } else {
                                $link = Linker::makeExternalLink( $file->getDescriptionUrl(),
                                        $file->getTitle()->getPrefixedText() );
                                $fromSrc = wfMessage( 'shared-repo-from', $file->getRepo()->getDisplayName() )->text();
                        }
                        $out->addHTML( "<li>{$link} {$fromSrc}</li>\n" );
                }
                $out->addHTML( "</ul></div>\n" );
        }

        public function delete() {
                $file = $this->mPage->getFile();
                if ( !$file->exists() || !$file->isLocal() || $file->getRedirected() ) {
                        // Standard article deletion
                        parent::delete();
                        return;
                }

                $deleter = new FileDeleteForm( $file );
                $deleter->execute();
        }

        function showError( $description ) {
                $out = $this->getContext()->getOutput();
                $out->setPageTitle( wfMessage( 'internalerror' ) );
                $out->setRobotPolicy( 'noindex,nofollow' );
                $out->setArticleRelated( false );
                $out->enableClientCache( false );
                $out->addWikiText( $description );
        }

        protected function compare( $a, $b ) {
                if ( $a->page_namespace == $b->page_namespace ) {
                        return strcmp( $a->page_title, $b->page_title );
                } else {
                        return $a->page_namespace - $b->page_namespace;
                }
        }
}

class ImageHistoryList extends ContextSource {

        protected $title;

        protected $img;

        protected $imagePage;

        protected $current;

        protected $repo, $showThumb;
        protected $preventClickjacking = false;

        public function __construct( $imagePage ) {
                global $wgShowArchiveThumbnails;
                $this->current = $imagePage->getFile();
                $this->img = $imagePage->getDisplayedFile();
                $this->title = $imagePage->getTitle();
                $this->imagePage = $imagePage;
                $this->showThumb = $wgShowArchiveThumbnails && $this->img->canRender();
                $this->setContext( $imagePage->getContext() );
        }

        public function getImagePage() {
                return $this->imagePage;
        }

        public function getFile() {
                return $this->img;
        }

        public function beginImageHistoryList( $navLinks = '' ) {
                return Xml::element( 'h2', array( 'id' => 'filehistory' ), $this->msg( 'filehist' )->text() ) . "\n"
                        . "<div id=\"mw-imagepage-section-filehistory\">\n"
                        . $this->msg( 'filehist-help' )->parseAsBlock()
                        . $navLinks . "\n"
                        . Xml::openElement( 'table', array( 'class' => 'wikitable filehistory' ) ) . "\n"
                        . '<tr><td></td>'
                        . ( $this->current->isLocal() && ( $this->getUser()->isAllowedAny( 'delete', 'deletedhistory' ) ) ? '<td></td>' : '' )
                        . '<th>' . $this->msg( 'filehist-datetime' )->escaped() . '</th>'
                        . ( $this->showThumb ? '<th>' . $this->msg( 'filehist-thumb' )->escaped() . '</th>' : '' )
                        . '<th>' . $this->msg( 'filehist-dimensions' )->escaped() . '</th>'
                        . '<th>' . $this->msg( 'filehist-user' )->escaped() . '</th>'
                        . '<th>' . $this->msg( 'filehist-comment' )->escaped() . '</th>'
                        . "</tr>\n";
        }

        public function endImageHistoryList( $navLinks = '' ) {
                return "</table>\n$navLinks\n</div>\n";
        }

        public function imageHistoryLine( $iscur, $file ) {
                global $wgContLang;

                $user = $this->getUser();
                $lang = $this->getLanguage();
                $timestamp = wfTimestamp( TS_MW, $file->getTimestamp() );
                $img = $iscur ? $file->getName() : $file->getArchiveName();
                $userId = $file->getUser( 'id' );
                $userText = $file->getUser( 'text' );
                $description = $file->getDescription( File::FOR_THIS_USER, $user );

                $local = $this->current->isLocal();
                $row = $selected = '';

                // Deletion link
                if ( $local && ( $user->isAllowedAny( 'delete', 'deletedhistory' ) ) ) {
                        $row .= '<td>';
                        # Link to remove from history
                        if ( $user->isAllowed( 'delete' ) ) {
                                $q = array( 'action' => 'delete' );
                                if ( !$iscur ) {
                                        $q['oldimage'] = $img;
                                }
                                $row .= Linker::linkKnown(
                                        $this->title,
                                        $this->msg( $iscur ? 'filehist-deleteall' : 'filehist-deleteone' )->escaped(),
                                        array(), $q
                                );
                        }
                        # Link to hide content. Don't show useless link to people who cannot hide revisions.
                        $canHide = $user->isAllowed( 'deleterevision' );
                        if ( $canHide || ( $user->isAllowed( 'deletedhistory' ) && $file->getVisibility() ) ) {
                                if ( $user->isAllowed( 'delete' ) ) {
                                        $row .= '<br />';
                                }
                                // If file is top revision or locked from this user, don't link
                                if ( $iscur || !$file->userCan( File::DELETED_RESTRICTED, $user ) ) {
                                        $del = Linker::revDeleteLinkDisabled( $canHide );
                                } else {
                                        list( $ts, ) = explode( '!', $img, 2 );
                                        $query = array(
                                                'type'   => 'oldimage',
                                                'target' => $this->title->getPrefixedText(),
                                                'ids'    => $ts,
                                        );
                                        $del = Linker::revDeleteLink( $query,
                                                $file->isDeleted( File::DELETED_RESTRICTED ), $canHide );
                                }
                                $row .= $del;
                        }
                        $row .= '</td>';
                }

                // Reversion link/current indicator
                $row .= '<td>';
                if ( $iscur ) {
                        $row .= $this->msg( 'filehist-current' )->escaped();
                } elseif ( $local && $this->title->quickUserCan( 'edit', $user )
                        && $this->title->quickUserCan( 'upload', $user )
                ) {
                        if ( $file->isDeleted( File::DELETED_FILE ) ) {
                                $row .= $this->msg( 'filehist-revert' )->escaped();
                        } else {
                                $row .= Linker::linkKnown(
                                        $this->title,
                                        $this->msg( 'filehist-revert' )->escaped(),
                                        array(),
                                        array(
                                                'action' => 'revert',
                                                'oldimage' => $img,
                                                'wpEditToken' => $user->getEditToken( $img )
                                        )
                                );
                        }
                }
                $row .= '</td>';

                // Date/time and image link
                if ( $file->getTimestamp() === $this->img->getTimestamp() ) {
                        $selected = "class='filehistory-selected'";
                }
                $row .= "<td $selected style='white-space: nowrap;'>";
                if ( !$file->userCan( File::DELETED_FILE, $user ) ) {
                        # Don't link to unviewable files
                        $row .= '<span class="history-deleted">' . $lang->userTimeAndDate( $timestamp, $user ) . '</span>';
                } elseif ( $file->isDeleted( File::DELETED_FILE ) ) {
                        if ( $local ) {
                                $this->preventClickjacking();
                                $revdel = SpecialPage::getTitleFor( 'Revisiondelete' );
                                # Make a link to review the image
                                $url = Linker::linkKnown(
                                        $revdel,
                                        $lang->userTimeAndDate( $timestamp, $user ),
                                        array(),
                                        array(
                                                'target' => $this->title->getPrefixedText(),
                                                'file' => $img,
                                                'token' => $user->getEditToken( $img )
                                        )
                                );
                        } else {
                                $url = $lang->userTimeAndDate( $timestamp, $user );
                        }
                        $row .= '<span class="history-deleted">' . $url . '</span>';
                } else {
                        $url = $iscur ? $this->current->getUrl() : $this->current->getArchiveUrl( $img );
                        $row .= Xml::element( 'a', array( 'href' => $url ), $lang->userTimeAndDate( $timestamp, $user ) );
                }
                $row .= "</td>";

                // Thumbnail
                if ( $this->showThumb ) {
                        $row .= '<td>' . $this->getThumbForLine( $file ) . '</td>';
                }

                // Image dimensions + size
                $row .= '<td>';
                $row .= htmlspecialchars( $file->getDimensionsString() );
                $row .= $this->msg( 'word-separator' )->plain();
                $row .= '<span style="white-space: nowrap;">';
                $row .= $this->msg( 'parentheses' )->rawParams( Linker::formatSize( $file->getSize() ) )->plain();
                $row .= '</span>';
                $row .= '</td>';

                // Uploading user
                $row .= '<td>';
                // Hide deleted usernames
                if ( $file->isDeleted( File::DELETED_USER ) ) {
                        $row .= '<span class="history-deleted">' . $this->msg( 'rev-deleted-user' )->escaped() . '</span>';
                } else {
                        if ( $local ) {
                                $row .= Linker::userLink( $userId, $userText );
                                $row .= $this->msg( 'word-separator' )->plain();
                                $row .= '<span style="white-space: nowrap;">';
                                $row .= Linker::userToolLinks( $userId, $userText );
                                $row .= '</span>';
                        } else {
                                $row .= htmlspecialchars( $userText );
                        }
                }
                $row .= '</td>';

                // Don't show deleted descriptions
                if ( $file->isDeleted( File::DELETED_COMMENT ) ) {
                        $row .= '<td><span class="history-deleted">' . $this->msg( 'rev-deleted-comment' )->escaped() . '</span></td>';
                } else {
                        $row .= '<td dir="' . $wgContLang->getDir() . '">' . Linker::formatComment( $description, $this->title ) . '</td>';
                }

                $rowClass = null;
                wfRunHooks( 'ImagePageFileHistoryLine', array( $this, $file, &$row, &$rowClass ) );
                $classAttr = $rowClass ? " class='$rowClass'" : '';

                return "<tr{$classAttr}>{$row}</tr>\n";
        }

        protected function getThumbForLine( $file ) {
                $lang = $this->getLanguage();
                $user = $this->getUser();
                if ( $file->allowInlineDisplay() && $file->userCan( File::DELETED_FILE,$user )
                        && !$file->isDeleted( File::DELETED_FILE ) )
                {
                        $params = array(
                                'width' => '120',
                                'height' => '120',
                        );
                        $timestamp = wfTimestamp( TS_MW, $file->getTimestamp() );

                        $thumbnail = $file->transform( $params );
                        $options = array(
                                'alt' => $this->msg( 'filehist-thumbtext',
                                        $lang->userTimeAndDate( $timestamp, $user ),
                                        $lang->userDate( $timestamp, $user ),
                                        $lang->userTime( $timestamp, $user ) )->text(),
                                'file-link' => true,
                        );

                        if ( !$thumbnail ) {
                                return $this->msg( 'filehist-nothumb' )->escaped();
                        }

                        return $thumbnail->toHtml( $options );
                } else {
                        return $this->msg( 'filehist-nothumb' )->escaped();
                }
        }

        protected function preventClickjacking( $enable = true ) {
                $this->preventClickjacking = $enable;
        }

        public function getPreventClickjacking() {
                return $this->preventClickjacking;
        }
}

class ImageHistoryPseudoPager extends ReverseChronologicalPager {
        protected $preventClickjacking = false;

        protected $mImg;

        protected $mTitle;

        function __construct( $imagePage ) {
                parent::__construct();
                $this->mImagePage = $imagePage;
                $this->mTitle = clone ( $imagePage->getTitle() );
                $this->mTitle->setFragment( '#filehistory' );
                $this->mImg = null;
                $this->mHist = array();
                $this->mRange = array( 0, 0 ); // display range
        }

        function getTitle() {
                return $this->mTitle;
        }

        function getQueryInfo() {
                return false;
        }

        function getIndexField() {
                return '';
        }

        function formatRow( $row ) {
                return '';
        }

        function getBody() {
                $s = '';
                $this->doQuery();
                if ( count( $this->mHist ) ) {
                        $list = new ImageHistoryList( $this->mImagePage );
                        # Generate prev/next links
                        $navLink = $this->getNavigationBar();
                        $s = $list->beginImageHistoryList( $navLink );
                        // Skip rows there just for paging links
                        for ( $i = $this->mRange[0]; $i <= $this->mRange[1]; $i++ ) {
                                $file = $this->mHist[$i];
                                $s .= $list->imageHistoryLine( !$file->isOld(), $file );
                        }
                        $s .= $list->endImageHistoryList( $navLink );

                        if ( $list->getPreventClickjacking() ) {
                                $this->preventClickjacking();
                        }
                }
                return $s;
        }

        function doQuery() {
                if ( $this->mQueryDone ) {
                        return;
                }
                $this->mImg = $this->mImagePage->getFile(); // ensure loading
                if ( !$this->mImg->exists() ) {
                        return;
                }
                $queryLimit = $this->mLimit + 1; // limit plus extra row
                if ( $this->mIsBackwards ) {
                        // Fetch the file history
                        $this->mHist = $this->mImg->getHistory( $queryLimit, null, $this->mOffset, false );
                        // The current rev may not meet the offset/limit
                        $numRows = count( $this->mHist );
                        if ( $numRows <= $this->mLimit && $this->mImg->getTimestamp() > $this->mOffset ) {
                                $this->mHist = array_merge( array( $this->mImg ), $this->mHist );
                        }
                } else {
                        // The current rev may not meet the offset
                        if ( !$this->mOffset || $this->mImg->getTimestamp() < $this->mOffset ) {
                                $this->mHist[] = $this->mImg;
                        }
                        // Old image versions (fetch extra row for nav links)
                        $oiLimit = count( $this->mHist ) ? $this->mLimit : $this->mLimit + 1;
                        // Fetch the file history
                        $this->mHist = array_merge( $this->mHist,
                                $this->mImg->getHistory( $oiLimit, $this->mOffset, null, false ) );
                }
                $numRows = count( $this->mHist ); // Total number of query results
                if ( $numRows ) {
                        # Index value of top item in the list
                        $firstIndex = $this->mIsBackwards ?
                                $this->mHist[$numRows - 1]->getTimestamp() : $this->mHist[0]->getTimestamp();
                        # Discard the extra result row if there is one
                        if ( $numRows > $this->mLimit && $numRows > 1 ) {
                                if ( $this->mIsBackwards ) {
                                        # Index value of item past the index
                                        $this->mPastTheEndIndex = $this->mHist[0]->getTimestamp();
                                        # Index value of bottom item in the list
                                        $lastIndex = $this->mHist[1]->getTimestamp();
                                        # Display range
                                        $this->mRange = array( 1, $numRows - 1 );
                                } else {
                                        # Index value of item past the index
                                        $this->mPastTheEndIndex = $this->mHist[$numRows - 1]->getTimestamp();
                                        # Index value of bottom item in the list
                                        $lastIndex = $this->mHist[$numRows - 2]->getTimestamp();
                                        # Display range
                                        $this->mRange = array( 0, $numRows - 2 );
                                }
                        } else {
                                # Setting indexes to an empty string means that they will be
                                # omitted if they would otherwise appear in URLs. It just so
                                # happens that this  is the right thing to do in the standard
                                # UI, in all the relevant cases.
                                $this->mPastTheEndIndex = '';
                                # Index value of bottom item in the list
                                $lastIndex = $this->mIsBackwards ?
                                        $this->mHist[0]->getTimestamp() : $this->mHist[$numRows - 1]->getTimestamp();
                                # Display range
                                $this->mRange = array( 0, $numRows - 1 );
                        }
                } else {
                        $firstIndex = '';
                        $lastIndex = '';
                        $this->mPastTheEndIndex = '';
                }
                if ( $this->mIsBackwards ) {
                        $this->mIsFirst = ( $numRows < $queryLimit );
                        $this->mIsLast = ( $this->mOffset == '' );
                        $this->mLastShown = $firstIndex;
                        $this->mFirstShown = $lastIndex;
                } else {
                        $this->mIsFirst = ( $this->mOffset == '' );
                        $this->mIsLast = ( $numRows < $queryLimit );
                        $this->mLastShown = $lastIndex;
                        $this->mFirstShown = $firstIndex;
                }
                $this->mQueryDone = true;
        }

        protected function preventClickjacking( $enable = true ) {
                $this->preventClickjacking = $enable;
        }

        public function getPreventClickjacking() {
                return $this->preventClickjacking;
        }

}