SpecialVersion.php

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<?php
use MediaWiki\ExtensionInfo;
 
class SpecialVersion extends SpecialPage {
 
    protected $firstExtOpened = false;
 
    protected $coreId = '';
 
    protected static $extensionTypes = false;
 
    private $parser;
 
    public function __construct( Parser $parser ) {
        parent::__construct( 'Version' );
        $this->parser = $parser;
    }
 
    public static function getCredits( ExtensionRegistry $reg, Config $conf ): array {
        $credits = $conf->get( 'ExtensionCredits' );
        foreach ( $reg->getAllThings() as $name => $credit ) {
            $credits[$credit['type']][] = $credit;
        }
        return $credits;
    }
 
    public function execute( $par ) {
        global $IP;
        $config = $this->getConfig();
        $credits = self::getCredits( ExtensionRegistry::getInstance(), $config );
 
        $this->setHeaders();
        $this->outputHeader();
        $out = $this->getOutput();
        $out->setPreventClickjacking( false );
 
        // Explode the sub page information into useful bits
        $parts = explode( '/', (string)$par );
        $extNode = null;
        if ( isset( $parts[1] ) ) {
            $extName = str_replace( '_', ' ', $parts[1] );
            // Find it!
            foreach ( $credits as $group => $extensions ) {
                foreach ( $extensions as $ext ) {
                    if ( isset( $ext['name'] ) && ( $ext['name'] === $extName ) ) {
                        $extNode = &$ext;
                        break 2;
                    }
                }
            }
            if ( !$extNode ) {
                $out->setStatusCode( 404 );
            }
        } else {
            $extName = 'MediaWiki';
        }
 
        // Now figure out what to do
        switch ( strtolower( $parts[0] ) ) {
            case 'credits':
                $out->addModuleStyles( 'mediawiki.special.version' );
 
                $wikiText = '{{int:version-credits-not-found}}';
                if ( $extName === 'MediaWiki' ) {
                    $wikiText = file_get_contents( $IP . '/CREDITS' );
                    // Put the contributor list into columns
                    $wikiText = str_replace(
                        [ '<!-- BEGIN CONTRIBUTOR LIST -->', '<!-- END CONTRIBUTOR LIST -->' ],
                        [ '<div class="mw-version-credits">', '</div>' ],
                        $wikiText );
                } elseif ( ( $extNode !== null ) && isset( $extNode['path'] ) ) {
                    $file = ExtensionInfo::getAuthorsFileName( dirname( $extNode['path'] ) );
                    if ( $file ) {
                        $wikiText = file_get_contents( $file );
                        if ( substr( $file, -4 ) === '.txt' ) {
                            $wikiText = Html::element(
                                'pre',
                                [
                                    'lang' => 'en',
                                    'dir' => 'ltr',
                                ],
                                $wikiText
                            );
                        }
                    }
                }
 
                $out->setPageTitle( $this->msg( 'version-credits-title', $extName ) );
                $out->addWikiTextAsInterface( $wikiText );
                break;
 
            case 'license':
                $out->setPageTitle( $this->msg( 'version-license-title', $extName ) );
 
                $licenseFound = false;
 
                if ( $extName === 'MediaWiki' ) {
                    $out->addWikiTextAsInterface(
                        file_get_contents( $IP . '/COPYING' )
                    );
                    $licenseFound = true;
                } elseif ( ( $extNode !== null ) && isset( $extNode['path'] ) ) {
                    $files = ExtensionInfo::getLicenseFileNames( dirname( $extNode['path'] ) );
 
                    if ( count( $files ) ) {
                        $licenseFound = true;
                        foreach ( $files as $file ) {
                            $out->addWikiTextAsInterface(
                                Html::element(
                                    'pre',
                                    [
                                        'lang' => 'en',
                                        'dir' => 'ltr',
                                    ],
                                    file_get_contents( $file )
                                )
                            );
                        }
                    }
                }
                if ( !$licenseFound ) {
                    $out->addWikiTextAsInterface( '{{int:version-license-not-found}}' );
                }
                break;
            default:
                $out->addModuleStyles( 'mediawiki.special.version' );
                $out->addWikiTextAsInterface(
                    self::getMediaWikiCredits() .
                    self::softwareInformation() .
                    $this->getEntryPointInfo()
                );
                $out->addHTML(
                    $this->getSkinCredits( $credits ) .
                    $this->getExtensionCredits( $credits ) .
                    $this->getExternalLibraries( $credits ) .
                    $this->getParserTags() .
                    $this->getParserFunctionHooks()
                );
                $out->addWikiTextAsInterface( $this->getHooks() );
                $out->addHTML( $this->IPInfo() );
 
                break;
        }
    }
 
    private static function getMediaWikiCredits() {
        $ret = Xml::element(
            'h2',
            [ 'id' => 'mw-version-license' ],
            wfMessage( 'version-license' )->text()
        );
 
        // This text is always left-to-right.
        $ret .= '<div class="plainlinks">';
        $ret .= "__NOTOC__
        " . self::getCopyrightAndAuthorList() . "\n
        " . '<div class="mw-version-license-info">' .
        wfMessage( 'version-license-info' )->text() .
        '</div>';
        $ret .= '</div>';
 
        return str_replace( "\t\t", '', $ret ) . "\n";
    }
 
    public static function getCopyrightAndAuthorList() {
        global $wgLang;
 
        if ( defined( 'MEDIAWIKI_INSTALL' ) ) {
            $othersLink = '[https://www.mediawiki.org/wiki/Special:Version/Credits ' .
                wfMessage( 'version-poweredby-others' )->text() . ']';
        } else {
            $othersLink = '[[Special:Version/Credits|' .
                wfMessage( 'version-poweredby-others' )->text() . ']]';
        }
 
        $translatorsLink = '[https://translatewiki.net/wiki/Translating:MediaWiki/Credits ' .
            wfMessage( 'version-poweredby-translators' )->text() . ']';
 
        $authorList = [
            'Magnus Manske', 'Brion Vibber', 'Lee Daniel Crocker',
            'Tim Starling', 'Erik Möller', 'Gabriel Wicke', 'Ævar Arnfjörð Bjarmason',
            'Niklas Laxström', 'Domas Mituzas', 'Rob Church', 'Yuri Astrakhan',
            'Aryeh Gregor', 'Aaron Schulz', 'Andrew Garrett', 'Raimond Spekking',
            'Alexandre Emsenhuber', 'Siebrand Mazeland', 'Chad Horohoe',
            'Roan Kattouw', 'Trevor Parscal', 'Bryan Tong Minh', 'Sam Reed',
            'Victor Vasiliev', 'Rotem Liss', 'Platonides', 'Antoine Musso',
            'Timo Tijhof', 'Daniel Kinzler', 'Jeroen De Dauw', 'Brad Jorsch',
            'Bartosz Dziewoński', 'Ed Sanders', 'Moriel Schottlender',
            'Kunal Mehta', 'James D. Forrester', 'Brian Wolff', 'Adam Shorland',
            'DannyS712', 'Ori Livneh',
            $othersLink, $translatorsLink
        ];
 
        return wfMessage( 'version-poweredby-credits', MWTimestamp::getLocalInstance()->format( 'Y' ),
            $wgLang->listToText( $authorList ) )->text();
    }
 
    private static function getSoftwareInformation() {
        $dbr = wfGetDB( DB_REPLICA );
 
        // Put the software in an array of form 'name' => 'version'. All messages should
        // be loaded here, so feel free to use wfMessage in the 'name'. Wikitext
        // can be used both in the name and value.
        $software = [
            '[https://www.mediawiki.org/ MediaWiki]' => self::getVersionLinked(),
            '[https://php.net/ PHP]' => PHP_VERSION . " (" . PHP_SAPI . ")",
            $dbr->getSoftwareLink() => $dbr->getServerInfo(),
        ];
 
        if ( defined( 'INTL_ICU_VERSION' ) ) {
            $software['[https://icu.unicode.org/ ICU]'] = INTL_ICU_VERSION;
        }
 
        // Allow a hook to add/remove items.
        Hooks::runner()->onSoftwareInfo( $software );
 
        return $software;
    }
 
    private static function softwareInformation() {
        $out = Xml::element(
                'h2',
                [ 'id' => 'mw-version-software' ],
                wfMessage( 'version-software' )->text()
            ) .
            Xml::openElement( 'table', [ 'class' => 'wikitable plainlinks', 'id' => 'sv-software' ] ) .
            "<tr>
                <th>" . wfMessage( 'version-software-product' )->text() . "</th>
                <th>" . wfMessage( 'version-software-version' )->text() . "</th>
            </tr>\n";
 
        foreach ( self::getSoftwareInformation() as $name => $version ) {
            $out .= "<tr>
                    <td>" . $name . "</td>
                    <td dir=\"ltr\">" . $version . "</td>
                </tr>\n";
        }
 
        return $out . Xml::closeElement( 'table' );
    }
 
    public static function getVersion( $flags = '', $lang = null ) {
        global $IP;
 
        $gitInfo = self::getGitHeadSha1( $IP );
        if ( !$gitInfo ) {
            $version = MW_VERSION;
        } elseif ( $flags === 'nodb' ) {
            $shortSha1 = substr( $gitInfo, 0, 7 );
            $version = MW_VERSION . " ($shortSha1)";
        } else {
            $shortSha1 = substr( $gitInfo, 0, 7 );
            $msg = wfMessage( 'parentheses' );
            if ( $lang !== null ) {
                $msg->inLanguage( $lang );
            }
            $shortSha1 = $msg->params( $shortSha1 )->escaped();
            $version = MW_VERSION . ' ' . $shortSha1;
        }
 
        return $version;
    }
 
    public static function getVersionLinked() {
        $gitVersion = self::getVersionLinkedGit();
        if ( $gitVersion ) {
            $v = $gitVersion;
        } else {
            $v = MW_VERSION; // fallback
        }
 
        return $v;
    }
 
    private static function getMWVersionLinked() {
        $versionUrl = "";
        if ( Hooks::runner()->onSpecialVersionVersionUrl( MW_VERSION, $versionUrl ) ) {
            $versionParts = [];
            preg_match( "/^(\d+\.\d+)/", MW_VERSION, $versionParts );
            $versionUrl = "https://www.mediawiki.org/wiki/MediaWiki_{$versionParts[1]}";
        }
 
        return '[' . $versionUrl . ' ' . MW_VERSION . ']';
    }
 
    private static function getVersionLinkedGit() {
        global $IP, $wgLang;
 
        $gitInfo = new GitInfo( $IP );
        $headSHA1 = $gitInfo->getHeadSHA1();
        if ( !$headSHA1 ) {
            return false;
        }
 
        $shortSHA1 = '(' . substr( $headSHA1, 0, 7 ) . ')';
 
        $gitHeadUrl = $gitInfo->getHeadViewUrl();
        if ( $gitHeadUrl !== false ) {
            $shortSHA1 = "[$gitHeadUrl $shortSHA1]";
        }
 
        $gitHeadCommitDate = $gitInfo->getHeadCommitDate();
        if ( $gitHeadCommitDate ) {
            $shortSHA1 .= Html::element( 'br' ) . $wgLang->timeanddate( $gitHeadCommitDate, true );
        }
 
        return self::getMWVersionLinked() . " $shortSHA1";
    }
 
    public static function getExtensionTypes() {
        if ( self::$extensionTypes === false ) {
            self::$extensionTypes = [
                'specialpage' => wfMessage( 'version-specialpages' )->text(),
                'editor' => wfMessage( 'version-editors' )->text(),
                'parserhook' => wfMessage( 'version-parserhooks' )->text(),
                'variable' => wfMessage( 'version-variables' )->text(),
                'media' => wfMessage( 'version-mediahandlers' )->text(),
                'antispam' => wfMessage( 'version-antispam' )->text(),
                'skin' => wfMessage( 'version-skins' )->text(),
                'api' => wfMessage( 'version-api' )->text(),
                'other' => wfMessage( 'version-other' )->text(),
            ];
 
            Hooks::runner()->onExtensionTypes( self::$extensionTypes );
        }
 
        return self::$extensionTypes;
    }
 
    public static function getExtensionTypeName( $type ) {
        $types = self::getExtensionTypes();
 
        return $types[$type] ?? $types['other'];
    }
 
    private function getExtensionCredits( array $credits ) {
        if (
            !$credits ||
            // Skins are displayed separately, see getSkinCredits()
            ( count( $credits ) === 1 && isset( $credits['skin'] ) )
        ) {
            return '';
        }
 
        $extensionTypes = self::getExtensionTypes();
 
        $out = Xml::element(
                'h2',
                [ 'id' => 'mw-version-ext' ],
                $this->msg( 'version-extensions' )->text()
            ) .
            Xml::openElement( 'table', [ 'class' => 'wikitable plainlinks', 'id' => 'sv-ext' ] );
 
        // Make sure the 'other' type is set to an array.
        if ( !array_key_exists( 'other', $credits ) ) {
            $credits['other'] = [];
        }
 
        // Find all extensions that do not have a valid type and give them the type 'other'.
        foreach ( $credits as $type => $extensions ) {
            if ( !array_key_exists( $type, $extensionTypes ) ) {
                $credits['other'] = array_merge( $credits['other'], $extensions );
            }
        }
 
        $this->firstExtOpened = false;
        // Loop through the extension categories to display their extensions in the list.
        foreach ( $extensionTypes as $type => $message ) {
            // Skins have a separate section
            if ( $type !== 'other' && $type !== 'skin' ) {
                $out .= $this->getExtensionCategory( $type, $message, $credits[$type] ?? [] );
            }
        }
 
        // We want the 'other' type to be last in the list.
        $out .= $this->getExtensionCategory( 'other', $extensionTypes['other'], $credits['other'] );
 
        $out .= Xml::closeElement( 'table' );
 
        return $out;
    }
 
    private function getSkinCredits( array $credits ) {
        if ( !isset( $credits['skin'] ) || count( $credits['skin'] ) === 0 ) {
            return '';
        }
 
        $out = Xml::element(
                'h2',
                [ 'id' => 'mw-version-skin' ],
                $this->msg( 'version-skins' )->text()
            ) .
            Xml::openElement( 'table', [ 'class' => 'wikitable plainlinks', 'id' => 'sv-skin' ] );
 
        $this->firstExtOpened = false;
        $out .= $this->getExtensionCategory( 'skin', null, $credits['skin'] );
 
        $out .= Xml::closeElement( 'table' );
 
        return $out;
    }
 
    protected function getExternalLibraries( array $credits ) {
        global $IP;
        $paths = [
            "$IP/vendor/composer/installed.json"
        ];
 
        $extensionTypes = self::getExtensionTypes();
        foreach ( $extensionTypes as $type => $message ) {
            if ( !isset( $credits[$type] ) || $credits[$type] === [] ) {
                continue;
            }
            foreach ( $credits[$type] as $extension ) {
                if ( !isset( $extension['path'] ) ) {
                    continue;
                }
                $paths[] = dirname( $extension['path'] ) . '/vendor/composer/installed.json';
            }
        }
 
        $dependencies = [];
 
        foreach ( $paths as $path ) {
            if ( !file_exists( $path ) ) {
                continue;
            }
 
            $installed = new ComposerInstalled( $path );
 
            $dependencies += $installed->getInstalledDependencies();
        }
 
        if ( $dependencies === [] ) {
            return '';
        }
 
        ksort( $dependencies );
 
        $out = Html::element(
            'h2',
            [ 'id' => 'mw-version-libraries' ],
            $this->msg( 'version-libraries' )->text()
        );
        $out .= Html::openElement(
            'table',
            [ 'class' => 'wikitable plainlinks', 'id' => 'sv-libraries' ]
        );
        $out .= Html::openElement( 'tr' )
            . Html::element( 'th', [], $this->msg( 'version-libraries-library' )->text() )
            . Html::element( 'th', [], $this->msg( 'version-libraries-version' )->text() )
            . Html::element( 'th', [], $this->msg( 'version-libraries-license' )->text() )
            . Html::element( 'th', [], $this->msg( 'version-libraries-description' )->text() )
            . Html::element( 'th', [], $this->msg( 'version-libraries-authors' )->text() )
            . Html::closeElement( 'tr' );
 
        foreach ( $dependencies as $name => $info ) {
            if ( !is_array( $info ) || strpos( $info['type'], 'mediawiki-' ) === 0 ) {
                // Skip any extensions or skins since they'll be listed
                // in their proper section
                continue;
            }
            $authors = array_map( static function ( $arr ) {
                // If a homepage is set, link to it
                if ( isset( $arr['homepage'] ) ) {
                    return "[{$arr['homepage']} {$arr['name']}]";
                }
                return $arr['name'];
            }, $info['authors'] );
            $authors = $this->listAuthors( $authors, false, "$IP/vendor/$name" );
 
            // We can safely assume that the libraries' names and descriptions
            // are written in English and aren't going to be translated,
            // so set appropriate lang and dir attributes
            $out .= Html::openElement( 'tr', [
                // Add an anchor so docs can link easily to the version of
                // this specific library
                'id' => Sanitizer::escapeIdForAttribute(
                    "mw-version-library-$name"
                ) ] )
                . Html::rawElement(
                    'td',
                    [],
                    Linker::makeExternalLink(
                        "https://packagist.org/packages/$name", $name,
                        true, '',
                        [ 'class' => 'mw-version-library-name' ]
                    )
                )
                . Html::element( 'td', [ 'dir' => 'auto' ], $info['version'] )
                // @phan-suppress-next-line SecurityCheck-DoubleEscaped false positive
                . Html::element( 'td', [ 'dir' => 'auto' ], $this->listToText( $info['licenses'] ) )
                . Html::element( 'td', [ 'lang' => 'en', 'dir' => 'ltr' ], $info['description'] )
                . Html::rawElement( 'td', [], $authors )
                . Html::closeElement( 'tr' );
        }
        $out .= Html::closeElement( 'table' );
 
        return $out;
    }
 
    protected function getParserTags() {
        $tags = $this->parser->getTags();
 
        if ( count( $tags ) ) {
            $out = Html::rawElement(
                'h2',
                [
                    'class' => 'mw-headline plainlinks',
                    'id' => 'mw-version-parser-extensiontags',
                ],
                // @phan-suppress-next-line SecurityCheck-DoubleEscaped Using false for escape is safe
                Linker::makeExternalLink(
                    'https://www.mediawiki.org/wiki/Special:MyLanguage/Manual:Tag_extensions',
                    $this->msg( 'version-parser-extensiontags' )->parse(),
                    false /* msg()->parse() already escapes */
                )
            );
 
            array_walk( $tags, static function ( &$value ) {
                // Bidirectional isolation improves readability in RTL wikis
                $value = Html::element(
                    'bdi',
                    // Prevent < and > from slipping to another line
                    [
                        'style' => 'white-space: nowrap;',
                    ],
                    "<$value>"
                );
            } );
 
            $out .= $this->listToText( $tags );
        } else {
            $out = '';
        }
 
        return $out;
    }
 
    protected function getParserFunctionHooks() {
        $fhooks = $this->parser->getFunctionHooks();
        if ( count( $fhooks ) ) {
            $out = Html::rawElement(
                'h2',
                [
                    'class' => 'mw-headline plainlinks',
                    'id' => 'mw-version-parser-function-hooks',
                ],
                // @phan-suppress-next-line SecurityCheck-DoubleEscaped Using false for escape is safe
                Linker::makeExternalLink(
                    'https://www.mediawiki.org/wiki/Special:MyLanguage/Manual:Parser_functions',
                    $this->msg( 'version-parser-function-hooks' )->parse(),
                    false /* msg()->parse() already escapes */
                )
            );
 
            $out .= $this->listToText( $fhooks );
        } else {
            $out = '';
        }
 
        return $out;
    }
 
    protected function getExtensionCategory( $type, $message, array $creditsGroup ) {
        $config = $this->getConfig();
        $credits = $config->get( 'ExtensionCredits' );
 
        $out = '';
 
        if ( $creditsGroup ) {
            $out .= $this->openExtType( $message, 'credits-' . $type );
 
            usort( $creditsGroup, [ $this, 'compare' ] );
 
            foreach ( $creditsGroup as $extension ) {
                $out .= $this->getCreditsForExtension( $type, $extension );
            }
        }
 
        return $out;
    }
 
    public function compare( $a, $b ) {
        return $this->getLanguage()->lc( $a['name'] ) <=> $this->getLanguage()->lc( $b['name'] );
    }
 
    public function getCreditsForExtension( $type, array $extension ) {
        $out = $this->getOutput();
 
        // We must obtain the information for all the bits and pieces!
        // ... such as extension names and links
        if ( isset( $extension['namemsg'] ) ) {
            // Localized name of extension
            $extensionName = $this->msg( $extension['namemsg'] )->text();
        } elseif ( isset( $extension['name'] ) ) {
            // Non localized version
            $extensionName = $extension['name'];
        } else {
            $extensionName = $this->msg( 'version-no-ext-name' )->text();
        }
 
        if ( isset( $extension['url'] ) ) {
            $extensionNameLink = Linker::makeExternalLink(
                $extension['url'],
                $extensionName,
                true,
                '',
                [ 'class' => 'mw-version-ext-name' ]
            );
        } else {
            $extensionNameLink = htmlspecialchars( $extensionName );
        }
 
        // ... and the version information
        // If the extension path is set we will check that directory for GIT
        // metadata in an attempt to extract date and vcs commit metadata.
        $canonicalVersion = '&ndash;';
        $extensionPath = null;
        $vcsVersion = null;
        $vcsLink = null;
        $vcsDate = null;
 
        if ( isset( $extension['version'] ) ) {
            $canonicalVersion = $out->parseInlineAsInterface( $extension['version'] );
        }
 
        if ( isset( $extension['path'] ) ) {
            global $IP;
            $extensionPath = dirname( $extension['path'] );
            if ( $this->coreId == '' ) {
                wfDebug( 'Looking up core head id' );
                $coreHeadSHA1 = self::getGitHeadSha1( $IP );
                if ( $coreHeadSHA1 ) {
                    $this->coreId = $coreHeadSHA1;
                }
            }
            $cache = ObjectCache::getInstance( CACHE_ANYTHING );
            $memcKey = $cache->makeKey(
                'specialversion-ext-version-text', $extension['path'], $this->coreId
            );
            list( $vcsVersion, $vcsLink, $vcsDate ) = $cache->get( $memcKey );
 
            if ( !$vcsVersion ) {
                wfDebug( "Getting VCS info for extension {$extension['name']}" );
                $gitInfo = new GitInfo( $extensionPath );
                $vcsVersion = $gitInfo->getHeadSHA1();
                if ( $vcsVersion !== false ) {
                    $vcsVersion = substr( $vcsVersion, 0, 7 );
                    $vcsLink = $gitInfo->getHeadViewUrl();
                    $vcsDate = $gitInfo->getHeadCommitDate();
                }
                $cache->set( $memcKey, [ $vcsVersion, $vcsLink, $vcsDate ], 60 * 60 * 24 );
            } else {
                wfDebug( "Pulled VCS info for extension {$extension['name']} from cache" );
            }
        }
 
        $versionString = Html::rawElement(
            'span',
            [ 'class' => 'mw-version-ext-version' ],
            $canonicalVersion
        );
 
        if ( $vcsVersion ) {
            if ( $vcsLink ) {
                $vcsVerString = Linker::makeExternalLink(
                    $vcsLink,
                    $this->msg( 'version-version', $vcsVersion )->text(),
                    true,
                    '',
                    [ 'class' => 'mw-version-ext-vcs-version' ]
                );
            } else {
                $vcsVerString = Html::element( 'span',
                    [ 'class' => 'mw-version-ext-vcs-version' ],
                    "({$vcsVersion})"
                );
            }
            $versionString .= " {$vcsVerString}";
 
            if ( $vcsDate ) {
                $versionString .= ' ' . Html::element( 'span', [
                    'class' => 'mw-version-ext-vcs-timestamp',
                    'dir' => $this->getLanguage()->getDir(),
                ], $this->getLanguage()->timeanddate( $vcsDate, true ) );
            }
            $versionString = Html::rawElement( 'span',
                [ 'class' => 'mw-version-ext-meta-version' ],
                $versionString
            );
        }
 
        // ... and license information; if a license file exists we
        // will link to it
        $licenseLink = '';
        if ( isset( $extension['name'] ) ) {
            $licenseName = null;
            if ( isset( $extension['license-name'] ) ) {
                $licenseName = new HtmlArmor( $out->parseInlineAsInterface( $extension['license-name'] ) );
            } elseif ( ExtensionInfo::getLicenseFileNames( $extensionPath ) ) {
                $licenseName = $this->msg( 'version-ext-license' )->text();
            }
            if ( $licenseName !== null ) {
                $licenseLink = $this->getLinkRenderer()->makeLink(
                    $this->getPageTitle( 'License/' . $extension['name'] ),
                    $licenseName,
                    [
                        'class' => 'mw-version-ext-license',
                        'dir' => 'auto',
                    ]
                );
            }
        }
 
        // ... and generate the description; which can be a parameterized l10n message
        // in the form [ <msgname>, <parameter>, <parameter>... ] or just a straight
        // up string
        if ( isset( $extension['descriptionmsg'] ) ) {
            // Localized description of extension
            $descriptionMsg = $extension['descriptionmsg'];
 
            if ( is_array( $descriptionMsg ) ) {
                $descriptionMsgKey = array_shift( $descriptionMsg );
                $descriptionMsg = array_map( 'htmlspecialchars', $descriptionMsg );
                $description = $this->msg( $descriptionMsgKey, ...$descriptionMsg )->text();
            } else {
                $description = $this->msg( $descriptionMsg )->text();
            }
        } elseif ( isset( $extension['description'] ) ) {
            // Non localized version
            $description = $extension['description'];
        } else {
            $description = '';
        }
        $description = $out->parseInlineAsInterface( $description );
 
        // ... now get the authors for this extension
        $authors = $extension['author'] ?? [];
        $authors = $this->listAuthors( $authors, $extension['name'], $extensionPath );
 
        // Finally! Create the table
        $html = Html::openElement( 'tr', [
                'class' => 'mw-version-ext',
                'id' => Sanitizer::escapeIdForAttribute( 'mw-version-ext-' . $type . '-' . $extension['name'] )
            ]
        );
 
        $html .= Html::rawElement( 'td', [], $extensionNameLink );
        $html .= Html::rawElement( 'td', [], $versionString );
        $html .= Html::rawElement( 'td', [], $licenseLink );
        $html .= Html::rawElement( 'td', [ 'class' => 'mw-version-ext-description' ], $description );
        $html .= Html::rawElement( 'td', [ 'class' => 'mw-version-ext-authors' ], $authors );
 
        $html .= Html::closeElement( 'tr' );
 
        return $html;
    }
 
    private function getHooks() {
        if ( $this->getConfig()->get( 'SpecialVersionShowHooks' ) && count( $this->getConfig()->get( 'Hooks' ) ) ) {
            $myHooks = $this->getConfig()->get( 'Hooks' );
            ksort( $myHooks );
 
            $ret = [];
            $ret[] = '== {{int:version-hooks}} ==';
            $ret[] = Html::openElement( 'table', [ 'class' => 'wikitable', 'id' => 'sv-hooks' ] );
            $ret[] = Html::openElement( 'tr' );
            $ret[] = Html::element( 'th', [], $this->msg( 'version-hook-name' )->text() );
            $ret[] = Html::element( 'th', [], $this->msg( 'version-hook-subscribedby' )->text() );
            $ret[] = Html::closeElement( 'tr' );
 
            foreach ( $myHooks as $hook => $hooks ) {
                $ret[] = Html::openElement( 'tr' );
                $ret[] = Html::element( 'td', [], $hook );
                // @phan-suppress-next-line SecurityCheck-DoubleEscaped false positive
                $ret[] = Html::element( 'td', [], $this->listToText( $hooks ) );
                $ret[] = Html::closeElement( 'tr' );
            }
 
            $ret[] = Html::closeElement( 'table' );
 
            return implode( "\n", $ret );
        }
 
        return '';
    }
 
    private function openExtType( $text = null, $name = null ) {
        $out = '';
 
        $opt = [ 'colspan' => 5 ];
        if ( $this->firstExtOpened ) {
            // Insert a spacing line
            $out .= Html::rawElement( 'tr', [ 'class' => 'sv-space' ],
                Html::element( 'td', $opt )
            );
        }
        $this->firstExtOpened = true;
 
        if ( $name ) {
            $opt['id'] = "sv-$name";
        }
 
        if ( $text !== null ) {
            $out .= Html::rawElement( 'tr', [],
                Html::element( 'th', $opt, $text )
            );
        }
 
        $firstHeadingMsg = ( $name === 'credits-skin' )
            ? 'version-skin-colheader-name'
            : 'version-ext-colheader-name';
        $out .= Html::openElement( 'tr' );
        $out .= Html::element( 'th', [ 'class' => 'mw-version-ext-col-label' ],
            $this->msg( $firstHeadingMsg )->text() );
        $out .= Html::element( 'th', [ 'class' => 'mw-version-ext-col-label' ],
            $this->msg( 'version-ext-colheader-version' )->text() );
        $out .= Html::element( 'th', [ 'class' => 'mw-version-ext-col-label' ],
            $this->msg( 'version-ext-colheader-license' )->text() );
        $out .= Html::element( 'th', [ 'class' => 'mw-version-ext-col-label' ],
            $this->msg( 'version-ext-colheader-description' )->text() );
        $out .= Html::element( 'th', [ 'class' => 'mw-version-ext-col-label' ],
            $this->msg( 'version-ext-colheader-credits' )->text() );
        $out .= Html::closeElement( 'tr' );
 
        return $out;
    }
 
    private function IPInfo() {
        $ip = str_replace( '--', ' - ', htmlspecialchars( $this->getRequest()->getIP() ) );
 
        return "<!-- visited from $ip -->\n<span style='display:none'>visited from $ip</span>";
    }
 
    public function listAuthors( $authors, $extName, $extDir ) {
        $hasOthers = false;
        $linkRenderer = $this->getLinkRenderer();
 
        $list = [];
        $authors = (array)$authors;
 
        // Special case: if the authors array has only one item and it is "...",
        // it should not be rendered as the "version-poweredby-others" i18n msg,
        // but rather as "version-poweredby-various" i18n msg instead.
        if ( count( $authors ) === 1 && $authors[0] === '...' ) {
            // Link to the extension's or skin's AUTHORS or CREDITS file, if there is
            // such a file; otherwise just return the i18n msg as-is
            if ( $extName && ExtensionInfo::getAuthorsFileName( $extDir ) ) {
                return $linkRenderer->makeLink(
                    $this->getPageTitle( "Credits/$extName" ),
                    $this->msg( 'version-poweredby-various' )->text()
                );
            } else {
                return $this->msg( 'version-poweredby-various' )->escaped();
            }
        }
 
        // Otherwise, if we have an actual array that has more than one item,
        // process each array item as usual
        foreach ( $authors as $item ) {
            if ( $item == '...' ) {
                $hasOthers = true;
 
                if ( $extName && ExtensionInfo::getAuthorsFileName( $extDir ) ) {
                    $text = $linkRenderer->makeLink(
                        $this->getPageTitle( "Credits/$extName" ),
                        $this->msg( 'version-poweredby-others' )->text()
                    );
                } else {
                    $text = $this->msg( 'version-poweredby-others' )->escaped();
                }
                $list[] = $text;
            } elseif ( substr( $item, -5 ) == ' ...]' ) {
                $hasOthers = true;
                $list[] = $this->getOutput()->parseInlineAsInterface(
                    substr( $item, 0, -4 ) . $this->msg( 'version-poweredby-others' )->text() . "]"
                );
            } else {
                $list[] = $this->getOutput()->parseInlineAsInterface( $item );
            }
        }
 
        if ( $extName && !$hasOthers && ExtensionInfo::getAuthorsFileName( $extDir ) ) {
            $list[] = $linkRenderer->makeLink(
                $this->getPageTitle( "Credits/$extName" ),
                $this->msg( 'version-poweredby-others' )->text()
            );
        }
 
        return $this->listToText( $list, false );
    }
 
    public static function getExtAuthorsFileName( $extDir ) {
        wfDeprecated( __METHOD__, '1.35' );
        return ExtensionInfo::getAuthorsFileName( $extDir );
    }
 
    public static function getExtLicenseFileName( $extDir ) {
        wfDeprecated( __METHOD__, '1.35' );
        $licenses = ExtensionInfo::getLicenseFileNames( $extDir );
        if ( count( $licenses ) === 0 ) {
            return false;
        }
        return $licenses[0];
    }
 
    public function listToText( $list, $sort = true ) {
        if ( !count( $list ) ) {
            return '';
        }
        if ( $sort ) {
            sort( $list );
        }
 
        return $this->getLanguage()
            ->listToText( array_map( [ __CLASS__, 'arrayToString' ], $list ) );
    }
 
    public static function arrayToString( $list ) {
        if ( is_array( $list ) && count( $list ) == 1 ) {
            $list = $list[0];
        }
        if ( $list instanceof Closure ) {
            // Don't output stuff like "Closure$;1028376090#8$48499d94fe0147f7c633b365be39952b$"
            return 'Closure';
        } elseif ( is_object( $list ) ) {
            $class = wfMessage( 'parentheses' )->params( get_class( $list ) )->escaped();
 
            return $class;
        } elseif ( !is_array( $list ) ) {
            return $list;
        } else {
            if ( is_object( $list[0] ) ) {
                $class = get_class( $list[0] );
            } else {
                $class = $list[0];
            }
 
            return wfMessage( 'parentheses' )->params( "$class, {$list[1]}" )->escaped();
        }
    }
 
    public static function getGitHeadSha1( $dir ) {
        $repo = new GitInfo( $dir );
 
        return $repo->getHeadSHA1();
    }
 
    public static function getGitCurrentBranch( $dir ) {
        $repo = new GitInfo( $dir );
        return $repo->getCurrentBranch();
    }
 
    public function getEntryPointInfo() {
        $config = $this->getConfig();
        $scriptPath = $config->get( 'ScriptPath' ) ?: '/';
 
        $entryPoints = [
            'version-entrypoints-articlepath' => $config->get( 'ArticlePath' ),
            'version-entrypoints-scriptpath' => $scriptPath,
            'version-entrypoints-index-php' => wfScript( 'index' ),
            'version-entrypoints-api-php' => wfScript( 'api' ),
            'version-entrypoints-rest-php' => wfScript( 'rest' ),
        ];
 
        $language = $this->getLanguage();
        $thAttribures = [
            'dir' => $language->getDir(),
            'lang' => $language->getHtmlCode()
        ];
        $out = Html::element(
                'h2',
                [ 'id' => 'mw-version-entrypoints' ],
                $this->msg( 'version-entrypoints' )->text()
            ) .
            Html::openElement( 'table',
                [
                    'class' => 'wikitable plainlinks',
                    'id' => 'mw-version-entrypoints-table',
                    'dir' => 'ltr',
                    'lang' => 'en'
                ]
            ) .
            Html::openElement( 'tr' ) .
            Html::element(
                'th',
                $thAttribures,
                $this->msg( 'version-entrypoints-header-entrypoint' )->text()
            ) .
            Html::element(
                'th',
                $thAttribures,
                $this->msg( 'version-entrypoints-header-url' )->text()
            ) .
            Html::closeElement( 'tr' );
 
        foreach ( $entryPoints as $message => $value ) {
            $url = wfExpandUrl( $value, PROTO_RELATIVE );
            $out .= Html::openElement( 'tr' ) .
                // ->plain() looks like it should be ->parse(), but this function
                // returns wikitext, not HTML, boo
                Html::rawElement( 'td', [], $this->msg( $message )->plain() ) .
                Html::rawElement( 'td', [], Html::rawElement( 'code', [], "[$url $value]" ) ) .
                Html::closeElement( 'tr' );
        }
 
        $out .= Html::closeElement( 'table' );
 
        return $out;
    }
 
    protected function getGroupName() {
        return 'wiki';
    }
}