Merge "Use adaptive CDN TTLs for page views"

[mediawiki.git] / includes / page / ImagePage.php

<?php
/**
 * Special handling for file description pages.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 * http://www.gnu.org/copyleft/gpl.html
 *
 * @file
 */

/**
 * Class for viewing MediaWiki file description pages
 *
 * @ingroup Media
 */
class ImagePage extends Article {
        /** @var File */
        private $displayImg;

        /** @var FileRepo */
        private $repo;

        /** @var bool */
        private $fileLoaded;

        /** @var bool */
        protected $mExtraDescription = false;

        /**
         * @var WikiFilePage
         */
        protected $mPage;

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

        /**
         * @param File $file
         * @return void
         */
        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();
        }

        /**
         * Handler for action=render
         * Include body text only; none of the image extras
         */
        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 );
                        }
                }

                $out->addModuleStyles( [
                        'filepage', // always show the local local Filepage.css, bug 29277
                        'mediawiki.action.view.filepage', // Add MediaWiki styles for a file page
                ] );

        }

        /**
         * @return File
         */
        public function getDisplayedFile() {
                $this->loadFile();
                return $this->displayImg;
        }

        /**
         * Create the TOC
         *
         * @param bool $metadata Whether or not to show the metadata link
         * @return string
         */
        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>';
        }

        /**
         * Make a table with metadata to be shown in the output page.
         *
         * @todo FIXME: Bad interface, see note on MediaHandler::formatMetadata().
         *
         * @param array $metadata The array containing the Exif data
         * @return string The metadata table. This is treated as Wikitext (!)
         */
        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;
        }

        /**
         * Overloading Article's getContentObject method.
         *
         * Omit noarticletext if sharedupload; text will be fetched from the
         * shared upload server if possible.
         * @return string
         */
        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 );
        }

        /**
         * Make the text under the image to say what size preview
         *
         * @param $params array parameters for thumbnail
         * @param $sizeLinkBigImagePreview HTML for the current size
         * @return string HTML output
         */
        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 '';
                }
        }

        /**
         * Creates an thumbnail of specified size and returns an HTML link to it
         * @param array $params Scaler parameters
         * @param int $width
         * @param int $height
         * @return string
         */
        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 '';
                }
        }

        /**
         * Show a notice that the file is from a shared repository
         */
        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
                ] );
        }

        /**
         * Print out the various links at the bottom of the image page, e.g. reupload,
         * external editing (and instructions link) etc.
         */
        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" );
        }

        /**
         * For overloading
         */
        protected function closeShowImage() {
        }

        /**
         * If the page we've just displayed is in the "Image" namespace,
         * we follow it with an upload history of the image and its usage.
         */
        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();
                }
        }

        /**
         * @param string $target
         * @param int $limit
         * @return ResultWrapper
         */
        protected function queryImageLinks( $target, $limit ) {
                $dbr = wfGetDB( DB_REPLICA );

                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" );

                /**
                 * @var $file File
                 */
                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" );
        }

        /**
         * Delete the file, or an earlier version of it
         */
        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();
        }

        /**
         * Display an error with a wikitext description
         *
         * @param string $description
         */
        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 );
        }

        /**
         * Callback for usort() to do link sorts by (namespace, title)
         * Function copied from Title::compare()
         *
         * @param object $a Object page to compare with
         * @param object $b Object page to compare with
         * @return int Result of string comparison, or namespace comparison
         */
        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;
                }
        }

        /**
         * Returns the corresponding $wgImageLimits entry for the selected user option
         *
         * @param User $user
         * @param string $optionName Name of a option to check, typically imagesize or thumbsize
         * @return array
         * @since 1.21
         */
        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
        }

        /**
         * Output a drop-down box for language options for the file
         *
         * @param array $langChoices Array of string language codes
         * @param string $curLang Language code file is being viewed in.
         * @param string $defaultLang Language code that image is rendered in by default
         * @return string HTML to insert underneath image.
         */
        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;
        }

        /**
         * Get the width and height to display image at.
         *
         * @note This method assumes that it is only called if one
         *  of the dimensions are bigger than the max, or if the
         *  image is vectorized.
         *
         * @param int $maxWidth Max width to display at
         * @param int $maxHeight Max height to display at
         * @param int $width Actual width of the image
         * @param int $height Actual height of the image
         * @throws MWException
         * @return array Array (width, height)
         */
        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 ];
        }

        /**
         * Get alternative thumbnail sizes.
         *
         * @note This will only list several alternatives if thumbnails are rendered on 404
         * @param int $origWidth Actual width of image
         * @param int $origHeight Actual height of image
         * @return array An array of [width, height] pairs.
         */
        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;
        }

        /**
         * @see WikiFilePage::getFile
         * @return bool|File
         */
        public function getFile() {
                return $this->mPage->getFile();
        }

        /**
         * @see WikiFilePage::isLocal
         * @return bool
         */
        public function isLocal() {
                return $this->mPage->isLocal();
        }

        /**
         * @see WikiFilePage::getDuplicates
         * @return array|null
         */
        public function getDuplicates() {
                return $this->mPage->getDuplicates();
        }

        /**
         * @see WikiFilePage::getForeignCategories
         * @return TitleArray|Title[]
         */
        public function getForeignCategories() {
                $this->mPage->getForeignCategories();
        }

}