SpecialVersion.php

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<?php
class SpecialVersion extends SpecialPage {
    protected $firstExtOpened = false;
 
    protected $coreId = '';
 
    protected static $extensionTypes = false;
 
    protected static $viewvcUrls = array(
        'svn+ssh://svn.wikimedia.org/svnroot/mediawiki' => 'http://svn.wikimedia.org/viewvc/mediawiki',
        'http://svn.wikimedia.org/svnroot/mediawiki' => 'http://svn.wikimedia.org/viewvc/mediawiki',
        'https://svn.wikimedia.org/svnroot/mediawiki' => 'https://svn.wikimedia.org/viewvc/mediawiki',
    );
 
    public function __construct() {
        parent::__construct( 'Version' );
    }
 
    public function execute( $par ) {
        global $IP, $wgExtensionCredits;
 
        $this->setHeaders();
        $this->outputHeader();
        $out = $this->getOutput();
        $out->allowClickjacking();
 
        // 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 ( $wgExtensionCredits 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':
                $wikiText = '{{int:version-credits-not-found}}';
                if ( $extName === 'MediaWiki' ) {
                    $wikiText = file_get_contents( $IP . '/CREDITS' );
                } elseif ( ( $extNode !== null ) && isset( $extNode['path'] ) ) {
                    $file = $this->getExtAuthorsFileName( dirname( $extNode['path'] ) );
                    if ( $file ) {
                        $wikiText = file_get_contents( $file );
                        if ( substr( $file, -4 ) === '.txt' ) {
                            $wikiText = Html::element( 'pre', array(), $wikiText );
                        }
                    }
                }
 
                $out->setPageTitle( $this->msg( 'version-credits-title', $extName ) );
                $out->addWikiText( $wikiText );
                break;
 
            case 'license':
                $wikiText = '{{int:version-license-not-found}}';
                if ( $extName === 'MediaWiki' ) {
                    $wikiText = file_get_contents( $IP . '/COPYING' );
                } elseif ( ( $extNode !== null ) && isset( $extNode['path'] ) ) {
                    $file = $this->getExtLicenseFileName( dirname( $extNode['path'] ) );
                    if ( $file ) {
                        $wikiText = file_get_contents( $file );
                        if ( !isset( $extNode['license-name'] ) ) {
                            // If the developer did not explicitly set license-name they probably
                            // are unaware that we're now sucking this file in and thus it's probably
                            // not wikitext friendly.
                            $wikiText = "<pre>$wikiText</pre>";
                        }
                    }
                }
 
                $out->setPageTitle( $this->msg( 'version-license-title', $extName ) );
                $out->addWikiText( $wikiText );
                break;
 
            default:
                $out->addModules( 'mediawiki.special.version' );
                $out->addWikiText(
                    $this->getMediaWikiCredits() .
                    $this->softwareInformation() .
                    $this->getEntryPointInfo()
                );
                $out->addHtml(
                    $this->getExtensionCredits() .
                    $this->getParserTags() .
                    $this->getParserFunctionHooks()
                );
                $out->addWikiText( $this->getWgHooks() );
                $out->addHTML( $this->IPInfo() );
 
                break;
        }
    }
 
    private static function getMediaWikiCredits() {
        $ret = Xml::element(
            'h2',
            array( 'id' => 'mw-version-license' ),
            wfMessage( 'version-license' )->text()
        );
 
        // This text is always left-to-right.
        $ret .= '<div class="plainlinks">';
        $ret .= "__NOTOC__
        " . self::getCopyrightAndAuthorList() . "\n
        " . wfMessage( 'version-license-info' )->text();
        $ret .= '</div>';
 
        return str_replace( "\t\t", '', $ret ) . "\n";
    }
 
    public static function getCopyrightAndAuthorList() {
        global $wgLang;
 
        if ( defined( 'MEDIAWIKI_INSTALL' ) ) {
            $othersLink = '[//www.mediawiki.org/wiki/Special:Version/Credits ' .
                wfMessage( 'version-poweredby-others' )->text() . ']';
        } else {
            $othersLink = '[[Special:Version/Credits|' .
                wfMessage( 'version-poweredby-others' )->text() . ']]';
        }
 
        $translatorsLink = '[//translatewiki.net/wiki/Translating:MediaWiki/Credits ' .
            wfMessage( 'version-poweredby-translators' )->text() . ']';
 
        $authorList = array(
            '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', $othersLink,
            $translatorsLink
        );
 
        return wfMessage( 'version-poweredby-credits', MWTimestamp::getLocalInstance()->format( 'Y' ),
            $wgLang->listToText( $authorList ) )->text();
    }
 
    static function softwareInformation() {
        $dbr = wfGetDB( DB_SLAVE );
 
        // 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'. Raw HTML or
        // wikimarkup can be used.
        $software = array();
        $software['[https://www.mediawiki.org/ MediaWiki]'] = self::getVersionLinked();
        $software['[http://www.php.net/ PHP]'] = phpversion() . " (" . PHP_SAPI . ")";
        $software[$dbr->getSoftwareLink()] = $dbr->getServerInfo();
 
        // Allow a hook to add/remove items.
        wfRunHooks( 'SoftwareInfo', array( &$software ) );
 
        $out = Xml::element(
                'h2',
                array( 'id' => 'mw-version-software' ),
                wfMessage( 'version-software' )->text()
            ) .
                Xml::openElement( 'table', array( 'class' => 'wikitable plainlinks', 'id' => 'sv-software' ) ) .
                "<tr>
                    <th>" . wfMessage( 'version-software-product' )->text() . "</th>
                    <th>" . wfMessage( 'version-software-version' )->text() . "</th>
                </tr>\n";
 
        foreach ( $software 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 = '' ) {
        global $wgVersion, $IP;
        wfProfileIn( __METHOD__ );
 
        $gitInfo = self::getGitHeadSha1( $IP );
        $svnInfo = self::getSvnInfo( $IP );
        if ( !$svnInfo && !$gitInfo ) {
            $version = $wgVersion;
        } elseif ( $gitInfo && $flags === 'nodb' ) {
            $shortSha1 = substr( $gitInfo, 0, 7 );
            $version = "$wgVersion ($shortSha1)";
        } elseif ( $gitInfo ) {
            $shortSha1 = substr( $gitInfo, 0, 7 );
            $shortSha1 = wfMessage( 'parentheses' )->params( $shortSha1 )->escaped();
            $version = "$wgVersion $shortSha1";
        } elseif ( $flags === 'nodb' ) {
            $version = "$wgVersion (r{$svnInfo['checkout-rev']})";
        } else {
            $version = $wgVersion . ' ' .
                wfMessage(
                    'version-svn-revision',
                    isset( $info['directory-rev'] ) ? $info['directory-rev'] : '',
                    $info['checkout-rev']
                )->text();
        }
 
        wfProfileOut( __METHOD__ );
 
        return $version;
    }
 
    public static function getVersionLinked() {
        global $wgVersion;
        wfProfileIn( __METHOD__ );
 
        $gitVersion = self::getVersionLinkedGit();
        if ( $gitVersion ) {
            $v = $gitVersion;
        } else {
            $svnVersion = self::getVersionLinkedSvn();
            if ( $svnVersion ) {
                $v = $svnVersion;
            } else {
                $v = $wgVersion; // fallback
            }
        }
 
        wfProfileOut( __METHOD__ );
 
        return $v;
    }
 
    private static function getVersionLinkedSvn() {
        global $IP;
 
        $info = self::getSvnInfo( $IP );
        if ( !isset( $info['checkout-rev'] ) ) {
            return false;
        }
 
        $linkText = wfMessage(
            'version-svn-revision',
            isset( $info['directory-rev'] ) ? $info['directory-rev'] : '',
            $info['checkout-rev']
        )->text();
 
        if ( isset( $info['viewvc-url'] ) ) {
            $version = "[{$info['viewvc-url']} $linkText]";
        } else {
            $version = $linkText;
        }
 
        return self::getwgVersionLinked() . " $version";
    }
 
    private static function getwgVersionLinked() {
        global $wgVersion;
        $versionUrl = "";
        if ( wfRunHooks( 'SpecialVersionVersionUrl', array( $wgVersion, &$versionUrl ) ) ) {
            $versionParts = array();
            preg_match( "/^(\d+\.\d+)/", $wgVersion, $versionParts );
            $versionUrl = "https://www.mediawiki.org/wiki/MediaWiki_{$versionParts[1]}";
        }
 
        return "[$versionUrl $wgVersion]";
    }
 
    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::getwgVersionLinked() . " $shortSHA1";
    }
 
    public static function getExtensionTypes() {
        if ( self::$extensionTypes === false ) {
            self::$extensionTypes = array(
                'specialpage' => wfMessage( 'version-specialpages' )->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(),
            );
 
            wfRunHooks( 'ExtensionTypes', array( &self::$extensionTypes ) );
        }
 
        return self::$extensionTypes;
    }
 
    public static function getExtensionTypeName( $type ) {
        $types = self::getExtensionTypes();
 
        return isset( $types[$type] ) ? $types[$type] : $types['other'];
    }
 
    function getExtensionCredits() {
        global $wgExtensionCredits;
 
        if ( !count( $wgExtensionCredits ) ) {
            return '';
        }
 
        $extensionTypes = self::getExtensionTypes();
 
        wfRunHooks( 'SpecialVersionExtensionTypes', array( &$this, &$extensionTypes ) );
 
        $out = Xml::element(
                'h2',
                array( 'id' => 'mw-version-ext' ),
                $this->msg( 'version-extensions' )->text()
            ) .
            Xml::openElement( 'table', array( 'class' => 'wikitable plainlinks', 'id' => 'sv-ext' ) );
 
        // Make sure the 'other' type is set to an array.
        if ( !array_key_exists( 'other', $wgExtensionCredits ) ) {
            $wgExtensionCredits['other'] = array();
        }
 
        // Find all extensions that do not have a valid type and give them the type 'other'.
        foreach ( $wgExtensionCredits as $type => $extensions ) {
            if ( !array_key_exists( $type, $extensionTypes ) ) {
                $wgExtensionCredits['other'] = array_merge( $wgExtensionCredits['other'], $extensions );
            }
        }
 
        // Loop through the extension categories to display their extensions in the list.
        foreach ( $extensionTypes as $type => $message ) {
            if ( $type != 'other' ) {
                $out .= $this->getExtensionCategory( $type, $message );
            }
        }
 
        // We want the 'other' type to be last in the list.
        $out .= $this->getExtensionCategory( 'other', $extensionTypes['other'] );
 
        $out .= Xml::closeElement( 'table' );
 
        return $out;
    }
 
    protected function getParserTags() {
        global $wgParser;
 
        $tags = $wgParser->getTags();
 
        if ( count( $tags ) ) {
            $out = Html::rawElement(
                'h2',
                array( 'class' => 'mw-headline' ),
                Linker::makeExternalLink(
                    '//www.mediawiki.org/wiki/Special:MyLanguage/Manual:Tag_extensions',
                    $this->msg( 'version-parser-extensiontags' )->parse(),
                    false /* msg()->parse() already escapes */
                )
            );
 
            array_walk( $tags, function ( &$value ) {
                $value = '&lt;' . htmlentities( $value ) . '&gt;';
            } );
            $out .= $this->listToText( $tags );
        } else {
            $out = '';
        }
 
        return $out;
    }
 
    protected function getParserFunctionHooks() {
        global $wgParser;
 
        $fhooks = $wgParser->getFunctionHooks();
        if ( count( $fhooks ) ) {
            $out = Html::rawElement( 'h2', array( 'class' => 'mw-headline' ), Linker::makeExternalLink(
                '//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 ) {
        global $wgExtensionCredits;
 
        $out = '';
 
        if ( array_key_exists( $type, $wgExtensionCredits ) && count( $wgExtensionCredits[$type] ) > 0 ) {
            $out .= $this->openExtType( $message, 'credits-' . $type );
 
            usort( $wgExtensionCredits[$type], array( $this, 'compare' ) );
 
            foreach ( $wgExtensionCredits[$type] as $extension ) {
                $out .= $this->getCreditsForExtension( $extension );
            }
        }
 
        return $out;
    }
 
    function compare( $a, $b ) {
        if ( $a['name'] === $b['name'] ) {
            return 0;
        } else {
            return $this->getLanguage()->lc( $a['name'] ) > $this->getLanguage()->lc( $b['name'] )
                ? 1
                : -1;
        }
    }
 
    function getCreditsForExtension( array $extension ) {
        $out = $this->getOutput();
 
        // We must obtain the information for all the bits and pieces!
        // ... such as extension names and links
        $extensionName = isset( $extension['name'] ) ? $extension['name'] : '[no name]';
        if ( isset( $extension['url'] ) ) {
            $extensionNameLink = Linker::makeExternalLink(
                $extension['url'],
                $extensionName,
                true,
                '',
                array( 'class' => 'mw-version-ext-name' )
            );
        } else {
            $extensionNameLink = $extensionName;
        }
 
        // ... and the version information
        // If the extension path is set we will check that directory for GIT and SVN
        // 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->parseInline( $extension['version'] );
        }
 
        if ( isset( $extension['path'] ) ) {
            global $IP;
            if ( $this->coreId == '' ) {
                wfDebug( 'Looking up core head id' );
                $coreHeadSHA1 = self::getGitHeadSha1( $IP );
                if ( $coreHeadSHA1 ) {
                    $this->coreId = $coreHeadSHA1;
                } else {
                    $svnInfo = self::getSvnInfo( $IP );
                    if ( $svnInfo !== false ) {
                        $this->coreId = $svnInfo['checkout-rev'];
                    }
                }
            }
            $cache = wfGetCache( CACHE_ANYTHING );
            $memcKey = wfMemcKey( 'specialversion-ext-version-text', $extension['path'], $this->coreId );
            list( $vcsVersion, $vcsLink, $vcsDate ) = $cache->get( $memcKey );
 
            if ( !$vcsVersion ) {
                wfDebug( "Getting VCS info for extension $extensionName" );
                $extensionPath = dirname( $extension['path'] );
                $gitInfo = new GitInfo( $extensionPath );
                $vcsVersion = $gitInfo->getHeadSHA1();
                if ( $vcsVersion !== false ) {
                    $vcsVersion = substr( $vcsVersion, 0, 7 );
                    $vcsLink = $gitInfo->getHeadViewUrl();
                    $vcsDate = $gitInfo->getHeadCommitDate();
                } else {
                    $svnInfo = self::getSvnInfo( $extensionPath );
                    if ( $svnInfo !== false ) {
                        $vcsVersion = $this->msg( 'version-svn-revision', $svnInfo['checkout-rev'] )->text();
                        $vcsLink = isset( $svnInfo['viewvc-url'] ) ? $svnInfo['viewvc-url'] : '';
                    }
                }
                $cache->set( $memcKey, array( $vcsVersion, $vcsLink, $vcsDate ), 60 * 60 * 24 );
            } else {
                wfDebug( "Pulled VCS info for extension $extensionName from cache" );
            }
        }
 
        $versionString = Html::rawElement(
            'span',
            array( 'class' => 'mw-version-ext-version' ),
            $canonicalVersion
        );
 
        if ( $vcsVersion ) {
            if ( $vcsLink ) {
                $vcsVerString = Linker::makeExternalLink(
                    $vcsLink,
                    $this->msg( 'version-version', $vcsVersion ),
                    true,
                    '',
                    array( 'class' => 'mw-version-ext-vcs-version' )
                );
            } else {
                $vcsVerString = Html::element( 'span',
                    array( 'class' => 'mw-version-ext-vcs-version' ),
                    "({$vcsVersion})"
                );
            }
            $versionString .= " {$vcsVerString}";
 
            if ( $vcsDate ) {
                $vcsTimeString = Html::element( 'span',
                    array( 'class' => 'mw-version-ext-vcs-timestamp' ),
                    $this->getLanguage()->timeanddate( $vcsDate )
                );
                $versionString .= " {$vcsTimeString}";
            }
            $versionString = Html::rawElement( 'span',
                array( 'class' => 'mw-version-ext-meta-version' ),
                $versionString
            );
        }
 
        // ... and license information; if a license file exists we
        // will link to it
        $licenseLink = '';
        if ( isset( $extension['license-name'] ) ) {
            $licenseLink = Linker::link(
                $this->getPageTitle( 'License/' . $extensionName ),
                $out->parseInline( $extension['license-name'] ),
                array( 'class' => 'mw-version-ext-license' )
            );
        } elseif ( $this->getExtLicenseFileName( $extensionPath ) ) {
            $licenseLink = Linker::link(
                $this->getPageTitle( 'License/' . $extensionName ),
                $this->msg( 'version-ext-license' ),
                array( 'class' => 'mw-version-ext-license' )
            );
        }
 
        // ... and generate the description; which can be a parameterized l10n message
        // in the form array( <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 = $descriptionMsg[0]; // Get the message key
                array_shift( $descriptionMsg ); // Shift out the message key to get the parameters only
                array_map( "htmlspecialchars", $descriptionMsg ); // For sanity
                $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->parseInline( $description );
 
        // ... now get the authors for this extension
        $authors = isset( $extension['author'] ) ? $extension['author'] : array();
        $authors = $this->listAuthors( $authors, $extensionName, $extensionPath );
 
        // Finally! Create the table
        $html = Html::openElement( 'tr', array(
                'class' => 'mw-version-ext',
                'id' => "mw-version-ext-{$extensionName}"
            )
        );
 
        $html .= Html::rawElement( 'td', array(), $extensionNameLink );
        $html .= Html::rawElement( 'td', array(), $versionString );
        $html .= Html::rawElement( 'td', array(), $licenseLink );
        $html .= Html::rawElement( 'td', array( 'class' => 'mw-version-ext-description' ), $description );
        $html .= Html::rawElement( 'td', array( 'class' => 'mw-version-ext-authors' ), $authors );
 
        $html .= Html::closeElement( 'td' );
 
        return $html;
    }
 
    private function getWgHooks() {
        global $wgSpecialVersionShowHooks, $wgHooks;
 
        if ( $wgSpecialVersionShowHooks && count( $wgHooks ) ) {
            $myWgHooks = $wgHooks;
            ksort( $myWgHooks );
 
            $ret = array();
            $ret[] = '== {{int:version-hooks}} ==';
            $ret[] = Html::openElement( 'table', array( 'class' => 'wikitable', 'id' => 'sv-hooks' ) );
            $ret[] = Html::openElement( 'tr' );
            $ret[] = Html::element( 'th', array(), $this->msg( 'version-hook-name' )->text() );
            $ret[] = Html::element( 'th', array(), $this->msg( 'version-hook-subscribedby' )->text() );
            $ret[] = Html::closeElement( 'tr' );
 
            foreach ( $myWgHooks as $hook => $hooks ) {
                $ret[] = Html::openElement( 'tr' );
                $ret[] = Html::element( 'td', array(), $hook );
                $ret[] = Html::element( 'td', array(), $this->listToText( $hooks ) );
                $ret[] = Html::closeElement( 'tr' );
            }
 
            $ret[] = Html::closeElement( 'table' );
 
            return implode( "\n", $ret );
        } else {
            return '';
        }
    }
 
    private function openExtType( $text, $name = null ) {
        $out = '';
 
        $opt = array( 'colspan' => 5 );
        if ( $this->firstExtOpened ) {
            // Insert a spacing line
            $out .= Html::rawElement( 'tr', array( 'class' => 'sv-space' ),
                Html::element( 'td', $opt )
            );
        }
        $this->firstExtOpened = true;
 
        if ( $name ) {
            $opt['id'] = "sv-$name";
        }
 
        $out .= Html::rawElement( 'tr', array(),
            Html::element( 'th', $opt, $text )
        );
 
        $out .= Html::openElement( 'tr' );
        $out .= Html::element( 'th', array( 'class' => 'mw-version-ext-col-label' ),
            $this->msg( 'version-ext-colheader-name' )->text() );
        $out .= Html::element( 'th', array( 'class' => 'mw-version-ext-col-label' ),
            $this->msg( 'version-ext-colheader-version' )->text() );
        $out .= Html::element( 'th', array( 'class' => 'mw-version-ext-col-label' ),
            $this->msg( 'version-ext-colheader-license' )->text() );
        $out .= Html::element( 'th', array( 'class' => 'mw-version-ext-col-label' ),
            $this->msg( 'version-ext-colheader-description' )->text() );
        $out .= Html::element( 'th', array( '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>";
    }
 
    function listAuthors( $authors, $extName, $extDir ) {
        $hasOthers = false;
 
        $list = array();
        foreach ( (array)$authors as $item ) {
            if ( $item == '...' ) {
                $hasOthers = true;
 
                if ( $this->getExtAuthorsFileName( $extDir ) ) {
                    $text = Linker::link(
                        $this->getPageTitle( "Credits/$extName" ),
                        $this->msg( 'version-poweredby-others' )->text()
                    );
                } else {
                    $text = $this->msg( 'version-poweredby-others' )->text();
                }
                $list[] = $text;
            } elseif ( substr( $item, -5 ) == ' ...]' ) {
                $hasOthers = true;
                $list[] = $this->getOutput()->parseInline(
                    substr( $item, 0, -4 ) . $this->msg( 'version-poweredby-others' )->text() . "]"
                );
            } else {
                $list[] = $this->getOutput()->parseInline( $item );
            }
        }
 
        if ( !$hasOthers && $this->getExtAuthorsFileName( $extDir ) ) {
            $list[] = $text = Linker::link(
                $this->getPageTitle( "Credits/$extName" ),
                $this->msg( 'version-poweredby-others' )->text()
            );
        }
 
        return $this->listToText( $list, false );
    }
 
    public static function getExtAuthorsFileName( $extDir ) {
        if ( !$extDir ) {
            return false;
        }
 
        foreach ( scandir( $extDir ) as $file ) {
            $fullPath = $extDir . DIRECTORY_SEPARATOR . $file;
            if ( preg_match( '/^((AUTHORS)|(CREDITS))(\.txt)?$/', $file ) &&
                is_readable( $fullPath ) &&
                is_file( $fullPath )
            ) {
                return $fullPath;
            }
        }
 
        return false;
    }
 
    public static function getExtLicenseFileName( $extDir ) {
        if ( !$extDir ) {
            return false;
        }
 
        foreach ( scandir( $extDir ) as $file ) {
            $fullPath = $extDir . DIRECTORY_SEPARATOR . $file;
            if ( preg_match( '/^((COPYING)|(LICENSE))(\.txt)?$/', $file ) &&
                is_readable( $fullPath ) &&
                is_file( $fullPath )
            ) {
                return $fullPath;
            }
        }
 
        return false;
    }
 
    function listToText( $list, $sort = true ) {
        $cnt = count( $list );
 
        if ( $cnt == 1 ) {
            // Enforce always returning a string
            return (string)self::arrayToString( $list[0] );
        } elseif ( $cnt == 0 ) {
            return '';
        } else {
            if ( $sort ) {
                sort( $list );
            }
 
            return $this->getLanguage()
                ->listToText( array_map( array( __CLASS__, 'arrayToString' ), $list ) );
        }
    }
 
    public static function arrayToString( $list ) {
        if ( is_array( $list ) && count( $list ) == 1 ) {
            $list = $list[0];
        }
        if ( 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 getSvnInfo( $dir ) {
        // http://svnbook.red-bean.com/nightly/en/svn.developer.insidewc.html
        $entries = $dir . '/.svn/entries';
 
        if ( !file_exists( $entries ) ) {
            return false;
        }
 
        $lines = file( $entries );
        if ( !count( $lines ) ) {
            return false;
        }
 
        // check if file is xml (subversion release <= 1.3) or not (subversion release = 1.4)
        if ( preg_match( '/^<\?xml/', $lines[0] ) ) {
            // subversion is release <= 1.3
            if ( !function_exists( 'simplexml_load_file' ) ) {
                // We could fall back to expat... YUCK
                return false;
            }
 
            // SimpleXml whines about the xmlns...
            wfSuppressWarnings();
            $xml = simplexml_load_file( $entries );
            wfRestoreWarnings();
 
            if ( $xml ) {
                foreach ( $xml->entry as $entry ) {
                    if ( $xml->entry[0]['name'] == '' ) {
                        // The directory entry should always have a revision marker.
                        if ( $entry['revision'] ) {
                            return array( 'checkout-rev' => intval( $entry['revision'] ) );
                        }
                    }
                }
            }
 
            return false;
        }
 
        // Subversion is release 1.4 or above.
        if ( count( $lines ) < 11 ) {
            return false;
        }
 
        $info = array(
            'checkout-rev' => intval( trim( $lines[3] ) ),
            'url' => trim( $lines[4] ),
            'repo-url' => trim( $lines[5] ),
            'directory-rev' => intval( trim( $lines[10] ) )
        );
 
        if ( isset( self::$viewvcUrls[$info['repo-url']] ) ) {
            $viewvc = str_replace(
                $info['repo-url'],
                self::$viewvcUrls[$info['repo-url']],
                $info['url']
            );
 
            $viewvc .= '/?pathrev=';
            $viewvc .= urlencode( $info['checkout-rev'] );
            $info['viewvc-url'] = $viewvc;
        }
 
        return $info;
    }
 
    public static function getSvnRevision( $dir ) {
        $info = self::getSvnInfo( $dir );
 
        if ( $info === false ) {
            return false;
        } elseif ( isset( $info['checkout-rev'] ) ) {
            return $info['checkout-rev'];
        } else {
            return false;
        }
    }
 
    public static function getGitHeadSha1( $dir ) {
        $repo = new GitInfo( $dir );
 
        return $repo->getHeadSHA1();
    }
 
    public function getEntryPointInfo() {
        global $wgArticlePath, $wgScriptPath;
        $scriptPath = $wgScriptPath ? $wgScriptPath : "/";
        $entryPoints = array(
            'version-entrypoints-articlepath' => $wgArticlePath,
            'version-entrypoints-scriptpath' => $scriptPath,
            'version-entrypoints-index-php' => wfScript( 'index' ),
            'version-entrypoints-api-php' => wfScript( 'api' ),
            'version-entrypoints-load-php' => wfScript( 'load' ),
        );
 
        $language = $this->getLanguage();
        $thAttribures = array(
            'dir' => $language->getDir(),
            'lang' => $language->getCode()
        );
        $out = Html::element(
                'h2',
                array( 'id' => 'mw-version-entrypoints' ),
                $this->msg( 'version-entrypoints' )->text()
            ) .
            Html::openElement( 'table',
                array(
                    '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' ) .
                // ->text() looks like it should be ->parse(), but this function
                // returns wikitext, not HTML, boo
                Html::rawElement( 'td', array(), $this->msg( $message )->text() ) .
                Html::rawElement( 'td', array(), Html::rawElement( 'code', array(), "[$url $value]" ) ) .
                Html::closeElement( 'tr' );
        }
 
        $out .= Html::closeElement( 'table' );
 
        return $out;
    }
 
    protected function getGroupName() {
        return 'wiki';
    }
}