ImagePage.php

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<?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 || ( $diff !== null && $diffOnly ) ) {
            parent::view();
            return;
        }

        $this->loadFile();

        if ( $this->getTitle()->getNamespace() == NS_FILE && $this->mPage->getFile()->getRedirected() ) {
            if ( $this->getTitle()->getDBkey() == $this->mPage->getFile()->getName() || $diff !== null ) {
                // 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'; // sic
                }
                $r .= "<tr class=\"$class\">\n";
                $r .= "<th>{$v['name']}</th>\n";
                $r .= "<td>{$v['value']}</td>\n</tr>";
            }
        }
        $r .= "</table>\n</div>\n";
        return $r;
    }

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

    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();

        $max = $this->getImageLimitsFromOption( $user, 'imagesize' );
        $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 );
            }

            $renderLang = $request->getVal( 'lang' );
            if ( !is_null( $renderLang ) ) {
                $params['lang'] = $renderLang;
            }

            $width_orig = $this->displayImg->getWidth( $page );
            $width = $width_orig;
            $height_orig = $this->displayImg->getHeight( $page );
            $height = $height_orig;

            $filename = wfEscapeWikiText( $this->displayImg->getName() );
            $linktext = $filename;

            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 ) { // FIXME: Possible division by 0. bug 36911
                        $height = round( $height * $maxWidth / $width ); // FIXME: Possible division by 0. bug 36911
                        $width = $maxWidth;
                        # Note that $height <= $maxHeight now.
                    } else {
                        $newwidth = floor( $width * $maxHeight / $height ); // FIXME: Possible division by 0. bug 36911
                        $height = round( $height * $newwidth / $width ); // FIXME: Possible division by 0. bug 36911
                        $width = $newwidth;
                        # Note that $height <= $maxHeight now, but might not be identical
                        # because of rounding.
                    }
                    $linktext = 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.
                        $thumbSizes = array( $this->getImageLimitsFromOption( $user, '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 )
                        {
                            $sizeLink = $this->makeSizeLink( $params, $size[0], $size[1] );
                            if ( $sizeLink ) {
                                $otherSizes[] = $sizeLink;
                            }
                        }
                    }
                    $msgsmall = '';
                    $sizeLinkBigImagePreview = $this->makeSizeLink( $params, $width, $height );
                    if ( $sizeLinkBigImagePreview ) {
                        $msgsmall .= wfMessage( 'show-big-image-preview' )->
                            rawParams( $sizeLinkBigImagePreview )->
                            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 );

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

                $isMulti = $this->displayImg->isMultipage() && $this->displayImg->pageCount() > 1;
                if ( $isMulti ) {
                    $out->addModules( 'mediawiki.page.image.pagination' );
                    $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 );
                        // on the client side, this link is generated in ajaxifyPageNavigation()
                        // in the mediawiki.page.image.pagination module
                        $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,
                    );
                    $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>"
                    );
                }
            } elseif ( $this->displayImg->isSafeFile() ) {
                # if direct link is allowed but it's not a renderable image, show an icon.
                $icon = $this->displayImg->iconThumb();

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

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

            $medialink = "[[Media:$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 overridden
            // 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->setCanonicalUrl( $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;

        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" );
        }

        $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;
            }

            $query = array();
            # Add a redirect=no to make redirect pages reachable
            if ( isset( $redirects[$element->page_title] ) ) {
                $query['redirect'] = 'no';
            }
            $link = Linker::linkKnown(
                Title::makeTitle( $element->page_namespace, $element->page_title ),
                null, array(), $query
            );
            if ( !isset( $redirects[$element->page_title] ) ) {
                # No redirects
                $liContents = $link;
            } elseif ( count( $redirects[$element->page_title] ) === 0 ) {
                # Redirect without usages
                $liContents = wfMessage( 'linkstoimage-redirect' )->rawParams( $link, '' )->parse();
            } else {
                # Redirect with usages
                $li = '';
                foreach ( $redirects[$element->page_title] as $row ) {
                    $currentCount++;
                    if ( $currentCount > $limit ) {
                        break;
                    }

                    $link2 = Linker::linkKnown( Title::makeTitle( $row->page_namespace, $row->page_title ) );
                    $li .= Html::rawElement(
                        'li',
                        array( 'class' => 'mw-imagepage-linkstoimage-ns' . $element->page_namespace ),
                        $link2
                        ) . "\n";
                }

                $ul = Html::rawElement(
                    'ul',
                    array( 'class' => 'mw-imagepage-redirectstofile' ),
                    $li
                    ) . "\n";
                $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;
        }
    }

    public function getImageLimitsFromOption( $user, $optionName ) {
        global $wgImageLimits;

        $option = $user->getIntOption( $optionName );
        if ( !isset( $wgImageLimits[$option] ) ) {
            $option = User::getDefaultOption( $optionName );
        }

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

        return isset( $wgImageLimits[$option] )
            ? $wgImageLimits[$option]
            : array( 800, 600 ); // if nothing is set, fallback to a hardcoded default
    }
}

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( $imagePage->getContext() );
        $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;
    }

}