ImagePage.php

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<?php
class ImagePage extends Article {
    private $displayImg;

    private $repo;

    private $fileLoaded;

    protected $mExtraDescription = false;

    protected $mPage;

    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;
        Hooks::run( 'ImagePageFindFile', [ $this, &$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(), $this->getOldID() );
                return;
            }
        }

        if ( $wgShowEXIF && $this->displayImg->exists() ) {
            // @todo FIXME: Bad interface, see note on MediaHandler::formatMetadata().
            $formattedMetadata = $this->displayImg->formatMetadata( $this->getContext() );
            $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', [ '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(), $this->getOldID() );
        }

        # Show shared description, if needed
        if ( $this->mExtraDescription ) {
            $fol = $this->getContext()->msg( 'shareddescriptionfollows' );
            if ( !$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',
            [ 'id' => 'filelinks' ],
                $this->getContext()->msg( '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 = '';
        Hooks::run( 'ImagePageAfterImageLinks', [ $this, &$html ] );
        if ( $html ) {
            $out->addHTML( $html );
        }

        if ( $showmeta ) {
            $out->addHTML( Xml::element(
                'h2',
                [ 'id' => 'metadata' ],
                    $this->getContext()->msg( 'metadata' )->text() ) . "\n" );
            $out->addWikiText( $this->makeMetadataTable( $formattedMetadata ) );
            $out->addModules( [ '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' );

        // Add MediaWiki styles for a file page
        $out->addModuleStyles( 'mediawiki.action.view.filepage' );
    }

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

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

        Hooks::run( 'ImagePageShowTOC', [ $this, &$r ] );

        if ( $metadata ) {
            $r[] = '<li><a href="#metadata">' .
                $this->getContext()->msg( 'metadata' )->escaped() .
                '</a></li>';
        }

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

    protected function makeMetadataTable( $metadata ) {
        $r = "<div class=\"mw-imagepage-section-metadata\">";
        $r .= $this->getContext()->msg( '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' ) {
                    // Handled by mediawiki.action.view.metadata module.
                    $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 getContentObject() {
        $this->loadFile();
        if ( $this->mPage->getFile() && !$this->mPage->getFile()->isLocal() && 0 == $this->getId() ) {
            return null;
        }
        return parent::getContentObject();
    }

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

        $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 = [];
                $page = 1;
            } else {
                $params = [ 'page' => $page ];
            }

            $renderLang = $request->getVal( 'lang' );
            if ( !is_null( $renderLang ) ) {
                $handler = $this->displayImg->getHandler();
                if ( $handler && $handler->validateParam( 'lang', $renderLang ) ) {
                    $params['lang'] = $renderLang;
                } else {
                    $renderLang = null;
                }
            }

            $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;

            Hooks::run( 'ImageOpenShowImageInlineBefore', [ &$this, &$out ] );

            if ( $this->displayImg->allowInlineDisplay() ) {
                # image
                # "Download high res version" link below the image
                # $msgsize = $this->getContext()->msg( '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 || $this->displayImg->isVectorized() ) {
                    list( $width, $height ) = $this->getDisplayWidthHeight(
                        $maxWidth, $maxHeight, $width, $height
                    );
                    $linktext = $this->getContext()->msg( 'show-big-image' )->escaped();

                    $thumbSizes = $this->getThumbSizes( $width_orig, $height_orig );
                    # Generate thumbnails or thumbnail links as needed...
                    $otherSizes = [];
                    foreach ( $thumbSizes as $size ) {
                        // We include a thumbnail size in the list, if it is
                        // less than or equal to the original size of the image
                        // asset ($width_orig/$height_orig). We also exclude
                        // the current thumbnail's size ($width/$height)
                        // since that is added to the message separately, so
                        // it can be denoted as the current size being shown.
                        // Vectorized images are limited by $wgSVGMaxSize big,
                        // so all thumbs less than or equal that are shown.
                        if ( ( ( $size[0] <= $width_orig && $size[1] <= $height_orig )
                                || ( $this->displayImg->isVectorized()
                                    && max( $size[0], $size[1] ) <= $wgSVGMaxSize )
                            )
                            && $size[0] != $width && $size[1] != $height
                        ) {
                            $sizeLink = $this->makeSizeLink( $params, $size[0], $size[1] );
                            if ( $sizeLink ) {
                                $otherSizes[] = $sizeLink;
                            }
                        }
                    }
                    $otherSizes = array_unique( $otherSizes );

                    $sizeLinkBigImagePreview = $this->makeSizeLink( $params, $width, $height );
                    $msgsmall = $this->getThumbPrevText( $params, $sizeLinkBigImagePreview );
                    if ( count( $otherSizes ) ) {
                        $msgsmall .= ' ' .
                        Html::rawElement(
                            'span',
                            [ 'class' => 'mw-filepage-other-resolutions' ],
                            $this->getContext()->msg( '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 = '';
                } else {
                    # Image is small enough to show full size on image page
                    $msgsmall = $this->getContext()->msg( 'file-nohires' )->parse();
                }

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

                $anchorclose = Html::rawElement(
                    'div',
                    [ '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 = [
                        '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( $this->getContext()->msg( '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,
                            [],
                            [ 'page' => $page - 1 ]
                        );
                        $thumb1 = Linker::makeThumbLinkObj(
                            $this->getTitle(),
                            $this->displayImg,
                            $link,
                            $label,
                            'none',
                            [ 'page' => $page - 1 ]
                        );
                    } else {
                        $thumb1 = '';
                    }

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

                    global $wgScript;

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

                    $out->addHTML(
                        '</td><td><div class="multipageimagenavbox">' .
                        Xml::openElement( 'form', $formParams ) .
                        Html::hidden( 'title', $this->getTitle()->getPrefixedDBkey() ) .
                        $this->getContext()->msg( 'imgmultigoto' )->rawParams( $select )->parse() .
                        Xml::submitButton( $this->getContext()->msg( 'imgmultigo' )->text() ) .
                        Xml::closeElement( 'form' ) .
                        "<hr />$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( [ 'file-link' => true ] ) .
                    "</div>\n" );
            }

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

            $handler = $this->displayImg->getHandler();

            // If this is a filetype with potential issues, warn the user.
            if ( $handler ) {
                $warningConfig = $handler->getWarningConfig( $this->displayImg );

                if ( $warningConfig !== null ) {
                    // The warning will be displayed via CSS and JavaScript.
                    // We just need to tell the client side what message to use.
                    $output = $this->getContext()->getOutput();
                    $output->addJsConfigVars( 'wgFileWarning', $warningConfig );
                    $output->addModules( $warningConfig['module'] );
                    $output->addModules( 'mediawiki.filewarning' );
                }
            }

            $medialink = "[[Media:$filename|$linktext]]";

            if ( !$this->displayImg->isSafeFile() ) {
                $warning = $this->getContext()->msg( '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.
                // @codingStandardsIgnoreStart Ignore long line
                $out->addWikiText( <<<EOT
<div class="fullMedia"><span class="dangerousLink">{$medialink}</span> $dirmark<span class="fileInfo">$longDesc</span></div>
<div class="mediaWarning">$warning</div>
EOT
                );
                // @codingStandardsIgnoreEnd
            } else {
                $out->addWikiText( <<<EOT
<div class="fullMedia">{$medialink} {$dirmark}<span class="fileInfo">$longDesc</span>
</div>
EOT
                );
            }

            $renderLangOptions = $this->displayImg->getAvailableLanguages();
            if ( count( $renderLangOptions ) >= 1 ) {
                $currentLanguage = $renderLang;
                $defaultLang = $this->displayImg->getDefaultRenderLanguage();
                if ( is_null( $currentLanguage ) ) {
                    $currentLanguage = $defaultLang;
                }
                $out->addHTML( $this->doRenderLangOpt( $renderLangOptions, $currentLanguage, $defaultLang ) );
            }

            // 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,
                    [ 'delete', 'move' ],
                    $this->getTitle()->getPrefixedText(),
                    '',
                    [ 'lim' => 10,
                        'conds' => [ "log_action != 'revision'" ],
                        'showIfEmpty' => false,
                        'msgKey' => [ 'moveddeleted-notice' ]
                    ]
                );
            }

            if ( $wgEnableUploads && $user->isAllowed( 'upload' ) ) {
                // Only show an upload link if the user can upload
                $uploadTitle = SpecialPage::getTitleFor( 'Upload' );
                $nofile = [
                    'filepage-nofile-link',
                    $uploadTitle->getFullURL( [ '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 Article::showMissingArticle.
                $request->response()->statusHeader( 404 );
            }
        }
        $out->setFileVersion( $this->displayImg );
    }

    private function getThumbPrevText( $params, $sizeLinkBigImagePreview ) {
        if ( $sizeLinkBigImagePreview ) {
            // Show a different message of preview is different format from original.
            $previewTypeDiffers = false;
            $origExt = $thumbExt = $this->displayImg->getExtension();
            if ( $this->displayImg->getHandler() ) {
                $origMime = $this->displayImg->getMimeType();
                $typeParams = $params;
                $this->displayImg->getHandler()->normaliseParams( $this->displayImg, $typeParams );
                list( $thumbExt, $thumbMime ) = $this->displayImg->getHandler()->getThumbType(
                    $origExt, $origMime, $typeParams );
                if ( $thumbMime !== $origMime ) {
                    $previewTypeDiffers = true;
                }
            }
            if ( $previewTypeDiffers ) {
                return $this->getContext()->msg( 'show-big-image-preview-differ' )->
                    rawParams( $sizeLinkBigImagePreview )->
                    params( strtoupper( $origExt ) )->
                    params( strtoupper( $thumbExt ) )->
                    parse();
            } else {
                return $this->getContext()->msg( 'show-big-image-preview' )->
                    rawParams( $sizeLinkBigImagePreview )->
                parse();
            }
        } else {
            return '';
        }
    }

    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', [
                'href' => $thumbnail->getUrl(),
                'class' => 'mw-thumbnail-link'
                ], $this->getContext()->msg( '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( $this->getContext()->getLanguage() );

        /* 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 &&
            $this->getContext()->msg( 'sharedupload-desc-here' )->plain() !== '-'
        ) {
            $out->wrapWikiMsg( $wrap, [ 'sharedupload-desc-here', $repo, $descUrl ] );
        } elseif ( $descUrl &&
            $this->getContext()->msg( 'sharedupload-desc-there' )->plain() !== '-'
        ) {
            $out->wrapWikiMsg( $wrap, [ 'sharedupload-desc-there', $repo, $descUrl ] );
        } else {
            $out->wrapWikiMsg( $wrap, [ 'sharedupload', $repo ], ''/*BACKCOMPAT*/ );
        }

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

    public function getUploadUrl() {
        $this->loadFile();
        $uploadTitle = SpecialPage::getTitleFor( 'Upload' );
        return $uploadTitle->getFullURL( [
            '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()->quickUserCan( 'upload', $this->getContext()->getUser() );
        if ( $canUpload && UploadBase::userCanReUpload(
                $this->getContext()->getUser(),
                $this->mPage->getFile() )
        ) {
            $ulink = Linker::makeExternalLink(
                $this->getUploadUrl(),
                $this->getContext()->msg( '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() {
    }

    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(
            [ 'imagelinks', 'page' ],
            [ 'page_namespace', 'page_title', 'il_to' ],
            [ 'il_to' => $target, 'il_from = page_id' ],
            __METHOD__,
            [ 'LIMIT' => $limit + 1, 'ORDER BY' => 'il_from', ]
        );
    }

    protected function imageLinks() {
        $limit = 100;

        $out = $this->getContext()->getOutput();

        $rows = [];
        $redirects = [];
        foreach ( $this->getTitle()->getRedirectsHere( NS_FILE ) as $redir ) {
            $redirects[$redir->getDBkey()] = [];
            $rows[] = (object)[
                'page_namespace' => NS_FILE,
                'page_title' => $redir->getDBkey(),
            ];
        }

        $res = $this->queryImageLinks( $this->getTitle()->getDBkey(), $limit + 1 );
        foreach ( $res as $row ) {
            $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',
                    [ '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',
                [ 'class' => 'mw-imagepage-linkstoimage' ] ) . "\n"
        );
        $count = 0;

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

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

            $query = [];
            # 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, [], $query
            );
            if ( !isset( $redirects[$element->page_title] ) ) {
                # No redirects
                $liContents = $link;
            } elseif ( count( $redirects[$element->page_title] ) === 0 ) {
                # Redirect without usages
                $liContents = $this->getContext()->msg( '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',
                        [ 'class' => 'mw-imagepage-linkstoimage-ns' . $element->page_namespace ],
                        $link2
                        ) . "\n";
                }

                $ul = Html::rawElement(
                    'ul',
                    [ 'class' => 'mw-imagepage-redirectstofile' ],
                    $li
                    ) . "\n";
                $liContents = $this->getContext()->msg( 'linkstoimage-redirect' )->rawParams(
                    $link, $ul )->parse();
            }
            $out->addHTML( Html::rawElement(
                    'li',
                    [ '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 = $this->getContext()->msg(
                    '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( $this->getContext()->msg( '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]
            : [ 800, 600 ]; // if nothing is set, fallback to a hardcoded default
    }

    protected function doRenderLangOpt( array $langChoices, $curLang, $defaultLang ) {
        global $wgScript;
        sort( $langChoices );
        $curLang = wfBCP47( $curLang );
        $defaultLang = wfBCP47( $defaultLang );
        $opts = '';
        $haveCurrentLang = false;
        $haveDefaultLang = false;

        // We make a list of all the language choices in the file.
        // Additionally if the default language to render this file
        // is not included as being in this file (for example, in svgs
        // usually the fallback content is the english content) also
        // include a choice for that. Last of all, if we're viewing
        // the file in a language not on the list, add it as a choice.
        foreach ( $langChoices as $lang ) {
            $code = wfBCP47( $lang );
            $name = Language::fetchLanguageName( $code, $this->getContext()->getLanguage()->getCode() );
            if ( $name !== '' ) {
                $display = $this->getContext()->msg( 'img-lang-opt', $code, $name )->text();
            } else {
                $display = $code;
            }
            $opts .= "\n" . Xml::option( $display, $code, $curLang === $code );
            if ( $curLang === $code ) {
                $haveCurrentLang = true;
            }
            if ( $defaultLang === $code ) {
                $haveDefaultLang = true;
            }
        }
        if ( !$haveDefaultLang ) {
            // Its hard to know if the content is really in the default language, or
            // if its just unmarked content that could be in any language.
            $opts = Xml::option(
                    $this->getContext()->msg( 'img-lang-default' )->text(),
                $defaultLang,
                $defaultLang === $curLang
            ) . $opts;
        }
        if ( !$haveCurrentLang && $defaultLang !== $curLang ) {
            $name = Language::fetchLanguageName( $curLang, $this->getContext()->getLanguage()->getCode() );
            if ( $name !== '' ) {
                $display = $this->getContext()->msg( 'img-lang-opt', $curLang, $name )->text();
            } else {
                $display = $curLang;
            }
            $opts = Xml::option( $display, $curLang, true ) . $opts;
        }

        $select = Html::rawElement(
            'select',
            [ 'id' => 'mw-imglangselector', 'name' => 'lang' ],
            $opts
        );
        $submit = Xml::submitButton( $this->getContext()->msg( 'img-lang-go' )->text() );

        $formContents = $this->getContext()->msg( 'img-lang-info' )
            ->rawParams( $select, $submit )
            ->parse();
        $formContents .= Html::hidden( 'title', $this->getTitle()->getPrefixedDBkey() );

        $langSelectLine = Html::rawElement( 'div', [ 'id' => 'mw-imglangselector-line' ],
            Html::rawElement( 'form', [ 'action' => $wgScript ], $formContents )
        );
        return $langSelectLine;
    }

    protected function getDisplayWidthHeight( $maxWidth, $maxHeight, $width, $height ) {
        if ( !$maxWidth || !$maxHeight ) {
            // should never happen
            throw new MWException( 'Using a choice from $wgImageLimits that is 0x0' );
        }

        if ( !$width || !$height ) {
            return [ 0, 0 ];
        }

        # Calculate the thumbnail size.
        if ( $width <= $maxWidth && $height <= $maxHeight ) {
            // Vectorized image, do nothing.
        } elseif ( $width / $height >= $maxWidth / $maxHeight ) {
            # The limiting factor is the width, not the height.
            $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.
        }
        return [ $width, $height ];
    }

    protected function getThumbSizes( $origWidth, $origHeight ) {
        global $wgImageLimits;
        if ( $this->displayImg->getRepo()->canTransformVia404() ) {
            $thumbSizes = $wgImageLimits;
            // Also include the full sized resolution in the list, so
            // that users know they can get it. This will link to the
            // original file asset if mustRender() === false. In the case
            // that we mustRender, some users have indicated that they would
            // find it useful to have the full size image in the rendered
            // image format.
            $thumbSizes[] = [ $origWidth, $origHeight ];
        } else {
            # Creating thumb links triggers thumbnail generation.
            # Just generate the thumb for the current users prefs.
            $thumbSizes = [
                $this->getImageLimitsFromOption( $this->getContext()->getUser(), 'thumbsize' )
            ];
            if ( !$this->displayImg->mustRender() ) {
                // We can safely include a link to the "full-size" preview,
                // without actually rendering.
                $thumbSizes[] = [ $origWidth, $origHeight ];
            }
        }
        return $thumbSizes;
    }

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

    public function isLocal() {
        return $this->mPage->isLocal();
    }

    public function getDuplicates() {
        return $this->mPage->getDuplicates();
    }

    public function getForeignCategories() {
        $this->mPage->getForeignCategories();
    }

}