ApiQuerySiteinfo.php

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<?php
use MediaWiki\MediaWikiServices;

class ApiQuerySiteinfo extends ApiQueryBase {

    public function __construct( ApiQuery $query, $moduleName ) {
        parent::__construct( $query, $moduleName, 'si' );
    }

    public function execute() {
        $params = $this->extractRequestParams();
        $done = [];
        $fit = false;
        foreach ( $params['prop'] as $p ) {
            switch ( $p ) {
                case 'general':
                    $fit = $this->appendGeneralInfo( $p );
                    break;
                case 'namespaces':
                    $fit = $this->appendNamespaces( $p );
                    break;
                case 'namespacealiases':
                    $fit = $this->appendNamespaceAliases( $p );
                    break;
                case 'specialpagealiases':
                    $fit = $this->appendSpecialPageAliases( $p );
                    break;
                case 'magicwords':
                    $fit = $this->appendMagicWords( $p );
                    break;
                case 'interwikimap':
                    $fit = $this->appendInterwikiMap( $p, $params['filteriw'] );
                    break;
                case 'dbrepllag':
                    $fit = $this->appendDbReplLagInfo( $p, $params['showalldb'] );
                    break;
                case 'statistics':
                    $fit = $this->appendStatistics( $p );
                    break;
                case 'usergroups':
                    $fit = $this->appendUserGroups( $p, $params['numberingroup'] );
                    break;
                case 'libraries':
                    $fit = $this->appendInstalledLibraries( $p );
                    break;
                case 'extensions':
                    $fit = $this->appendExtensions( $p );
                    break;
                case 'fileextensions':
                    $fit = $this->appendFileExtensions( $p );
                    break;
                case 'rightsinfo':
                    $fit = $this->appendRightsInfo( $p );
                    break;
                case 'restrictions':
                    $fit = $this->appendRestrictions( $p );
                    break;
                case 'languages':
                    $fit = $this->appendLanguages( $p );
                    break;
                case 'languagevariants':
                    $fit = $this->appendLanguageVariants( $p );
                    break;
                case 'skins':
                    $fit = $this->appendSkins( $p );
                    break;
                case 'extensiontags':
                    $fit = $this->appendExtensionTags( $p );
                    break;
                case 'functionhooks':
                    $fit = $this->appendFunctionHooks( $p );
                    break;
                case 'showhooks':
                    $fit = $this->appendSubscribedHooks( $p );
                    break;
                case 'variables':
                    $fit = $this->appendVariables( $p );
                    break;
                case 'protocols':
                    $fit = $this->appendProtocols( $p );
                    break;
                case 'defaultoptions':
                    $fit = $this->appendDefaultOptions( $p );
                    break;
                case 'uploaddialog':
                    $fit = $this->appendUploadDialog( $p );
                    break;
                default:
                    ApiBase::dieDebug( __METHOD__, "Unknown prop=$p" ); // @codeCoverageIgnore
            }
            if ( !$fit ) {
                // Abuse siprop as a query-continue parameter
                // and set it to all unprocessed props
                $this->setContinueEnumParameter( 'prop', implode( '|',
                    array_diff( $params['prop'], $done ) ) );
                break;
            }
            $done[] = $p;
        }
    }

    protected function appendGeneralInfo( $property ) {
        $config = $this->getConfig();

        $data = [];
        $mainPage = Title::newMainPage();
        $data['mainpage'] = $mainPage->getPrefixedText();
        $data['base'] = wfExpandUrl( $mainPage->getFullURL(), PROTO_CURRENT );
        $data['sitename'] = $config->get( 'Sitename' );

        // wgLogo can either be a relative or an absolute path
        // make sure we always return an absolute path
        $data['logo'] = wfExpandUrl( $config->get( 'Logo' ), PROTO_RELATIVE );

        $data['generator'] = "MediaWiki {$config->get( 'Version' )}";

        $data['phpversion'] = PHP_VERSION;
        $data['phpsapi'] = PHP_SAPI;
        if ( defined( 'HHVM_VERSION' ) ) {
            $data['hhvmversion'] = HHVM_VERSION; // @codeCoverageIgnore
        }
        $data['dbtype'] = $config->get( 'DBtype' );
        $data['dbversion'] = $this->getDB()->getServerVersion();

        $allowFrom = [ '' ];
        $allowException = true;
        if ( !$config->get( 'AllowExternalImages' ) ) {
            $data['imagewhitelistenabled'] = (bool)$config->get( 'EnableImageWhitelist' );
            $allowFrom = $config->get( 'AllowExternalImagesFrom' );
            $allowException = !empty( $allowFrom );
        }
        if ( $allowException ) {
            $data['externalimages'] = (array)$allowFrom;
            ApiResult::setIndexedTagName( $data['externalimages'], 'prefix' );
        }

        $data['langconversion'] = !$config->get( 'DisableLangConversion' );
        $data['titleconversion'] = !$config->get( 'DisableTitleConversion' );

        $contLang = MediaWikiServices::getInstance()->getContentLanguage();
        if ( $contLang->linkPrefixExtension() ) {
            $linkPrefixCharset = $contLang->linkPrefixCharset();
            $data['linkprefixcharset'] = $linkPrefixCharset;
            // For backwards compatibility
            $data['linkprefix'] = "/^((?>.*[^$linkPrefixCharset]|))(.+)$/sDu";
        } else {
            $data['linkprefixcharset'] = '';
            $data['linkprefix'] = '';
        }

        $linktrail = $contLang->linkTrail();
        $data['linktrail'] = $linktrail ?: '';

        $data['legaltitlechars'] = Title::legalChars();
        $data['invalidusernamechars'] = $config->get( 'InvalidUsernameCharacters' );

        $data['allunicodefixes'] = (bool)$config->get( 'AllUnicodeFixes' );
        $data['fixarabicunicode'] = (bool)$config->get( 'FixArabicUnicode' );
        $data['fixmalayalamunicode'] = (bool)$config->get( 'FixMalayalamUnicode' );

        global $IP;
        $git = SpecialVersion::getGitHeadSha1( $IP );
        if ( $git ) {
            $data['git-hash'] = $git;
            $data['git-branch'] =
                SpecialVersion::getGitCurrentBranch( $GLOBALS['IP'] );
        }

        // 'case-insensitive' option is reserved for future
        $data['case'] = $config->get( 'CapitalLinks' ) ? 'first-letter' : 'case-sensitive';
        $data['lang'] = $config->get( 'LanguageCode' );

        $fallbacks = [];
        foreach ( $contLang->getFallbackLanguages() as $code ) {
            $fallbacks[] = [ 'code' => $code ];
        }
        $data['fallback'] = $fallbacks;
        ApiResult::setIndexedTagName( $data['fallback'], 'lang' );

        if ( $contLang->hasVariants() ) {
            $variants = [];
            foreach ( $contLang->getVariants() as $code ) {
                $variants[] = [
                    'code' => $code,
                    'name' => $contLang->getVariantname( $code ),
                ];
            }
            $data['variants'] = $variants;
            ApiResult::setIndexedTagName( $data['variants'], 'lang' );
        }

        $data['rtl'] = $contLang->isRTL();
        $data['fallback8bitEncoding'] = $contLang->fallback8bitEncoding();

        $data['readonly'] = wfReadOnly();
        if ( $data['readonly'] ) {
            $data['readonlyreason'] = wfReadOnlyReason();
        }
        $data['writeapi'] = true; // Deprecated since MW 1.32

        $data['maxarticlesize'] = $config->get( 'MaxArticleSize' ) * 1024;

        $tz = $config->get( 'Localtimezone' );
        $offset = $config->get( 'LocalTZoffset' );
        $data['timezone'] = $tz;
        $data['timeoffset'] = intval( $offset );
        $data['articlepath'] = $config->get( 'ArticlePath' );
        $data['scriptpath'] = $config->get( 'ScriptPath' );
        $data['script'] = $config->get( 'Script' );
        $data['variantarticlepath'] = $config->get( 'VariantArticlePath' );
        $data[ApiResult::META_BC_BOOLS][] = 'variantarticlepath';
        $data['server'] = $config->get( 'Server' );
        $data['servername'] = $config->get( 'ServerName' );
        $data['wikiid'] = wfWikiID();
        $data['time'] = wfTimestamp( TS_ISO_8601, time() );

        $data['misermode'] = (bool)$config->get( 'MiserMode' );

        $data['uploadsenabled'] = UploadBase::isEnabled();
        $data['maxuploadsize'] = UploadBase::getMaxUploadSize();
        $data['minuploadchunksize'] = (int)$config->get( 'MinUploadChunkSize' );

        $data['galleryoptions'] = $config->get( 'GalleryOptions' );

        $data['thumblimits'] = $config->get( 'ThumbLimits' );
        ApiResult::setArrayType( $data['thumblimits'], 'BCassoc' );
        ApiResult::setIndexedTagName( $data['thumblimits'], 'limit' );
        $data['imagelimits'] = [];
        ApiResult::setArrayType( $data['imagelimits'], 'BCassoc' );
        ApiResult::setIndexedTagName( $data['imagelimits'], 'limit' );
        foreach ( $config->get( 'ImageLimits' ) as $k => $limit ) {
            $data['imagelimits'][$k] = [ 'width' => $limit[0], 'height' => $limit[1] ];
        }

        $favicon = $config->get( 'Favicon' );
        if ( !empty( $favicon ) ) {
            // wgFavicon can either be a relative or an absolute path
            // make sure we always return an absolute path
            $data['favicon'] = wfExpandUrl( $favicon, PROTO_RELATIVE );
        }

        $data['centralidlookupprovider'] = $config->get( 'CentralIdLookupProvider' );
        $providerIds = array_keys( $config->get( 'CentralIdLookupProviders' ) );
        $data['allcentralidlookupproviders'] = $providerIds;

        $data['interwikimagic'] = (bool)$config->get( 'InterwikiMagic' );
        $data['magiclinks'] = $config->get( 'EnableMagicLinks' );

        $data['categorycollation'] = $config->get( 'CategoryCollation' );

        Hooks::run( 'APIQuerySiteInfoGeneralInfo', [ $this, &$data ] );

        return $this->getResult()->addValue( 'query', $property, $data );
    }

    protected function appendNamespaces( $property ) {
        $data = [
            ApiResult::META_TYPE => 'assoc',
        ];
        foreach (
            MediaWikiServices::getInstance()->getContentLanguage()->getFormattedNamespaces()
            as $ns => $title
        ) {
            $data[$ns] = [
                'id' => intval( $ns ),
                'case' => MWNamespace::isCapitalized( $ns ) ? 'first-letter' : 'case-sensitive',
            ];
            ApiResult::setContentValue( $data[$ns], 'name', $title );
            $canonical = MWNamespace::getCanonicalName( $ns );

            $data[$ns]['subpages'] = MWNamespace::hasSubpages( $ns );

            if ( $canonical ) {
                $data[$ns]['canonical'] = strtr( $canonical, '_', ' ' );
            }

            $data[$ns]['content'] = MWNamespace::isContent( $ns );
            $data[$ns]['nonincludable'] = MWNamespace::isNonincludable( $ns );

            $contentmodel = MWNamespace::getNamespaceContentModel( $ns );
            if ( $contentmodel ) {
                $data[$ns]['defaultcontentmodel'] = $contentmodel;
            }
        }

        ApiResult::setArrayType( $data, 'assoc' );
        ApiResult::setIndexedTagName( $data, 'ns' );

        return $this->getResult()->addValue( 'query', $property, $data );
    }

    protected function appendNamespaceAliases( $property ) {
        $contLang = MediaWikiServices::getInstance()->getContentLanguage();
        $aliases = array_merge( $this->getConfig()->get( 'NamespaceAliases' ),
            $contLang->getNamespaceAliases() );
        $namespaces = $contLang->getNamespaces();
        $data = [];
        foreach ( $aliases as $title => $ns ) {
            if ( $namespaces[$ns] == $title ) {
                // Don't list duplicates
                continue;
            }
            $item = [
                'id' => intval( $ns )
            ];
            ApiResult::setContentValue( $item, 'alias', strtr( $title, '_', ' ' ) );
            $data[] = $item;
        }

        sort( $data );

        ApiResult::setIndexedTagName( $data, 'ns' );

        return $this->getResult()->addValue( 'query', $property, $data );
    }

    protected function appendSpecialPageAliases( $property ) {
        $data = [];
        $services = MediaWikiServices::getInstance();
        $aliases = $services->getContentLanguage()->getSpecialPageAliases();
        foreach ( $services->getSpecialPageFactory()->getNames() as $specialpage ) {
            if ( isset( $aliases[$specialpage] ) ) {
                $arr = [ 'realname' => $specialpage, 'aliases' => $aliases[$specialpage] ];
                ApiResult::setIndexedTagName( $arr['aliases'], 'alias' );
                $data[] = $arr;
            }
        }
        ApiResult::setIndexedTagName( $data, 'specialpage' );

        return $this->getResult()->addValue( 'query', $property, $data );
    }

    protected function appendMagicWords( $property ) {
        $data = [];
        foreach (
            MediaWikiServices::getInstance()->getContentLanguage()->getMagicWords()
            as $magicword => $aliases
        ) {
            $caseSensitive = array_shift( $aliases );
            $arr = [ 'name' => $magicword, 'aliases' => $aliases ];
            $arr['case-sensitive'] = (bool)$caseSensitive;
            ApiResult::setIndexedTagName( $arr['aliases'], 'alias' );
            $data[] = $arr;
        }
        ApiResult::setIndexedTagName( $data, 'magicword' );

        return $this->getResult()->addValue( 'query', $property, $data );
    }

    protected function appendInterwikiMap( $property, $filter ) {
        if ( $filter === 'local' ) {
            $local = 1;
        } elseif ( $filter === '!local' ) {
            $local = 0;
        } else {
            // $filter === null
            $local = null;
        }

        $params = $this->extractRequestParams();
        $langCode = $params['inlanguagecode'] ?? '';
        $langNames = Language::fetchLanguageNames( $langCode );

        $getPrefixes = MediaWikiServices::getInstance()->getInterwikiLookup()->getAllPrefixes( $local );
        $extraLangPrefixes = $this->getConfig()->get( 'ExtraInterlanguageLinkPrefixes' );
        $localInterwikis = $this->getConfig()->get( 'LocalInterwikis' );
        $data = [];

        foreach ( $getPrefixes as $row ) {
            $prefix = $row['iw_prefix'];
            $val = [];
            $val['prefix'] = $prefix;
            if ( isset( $row['iw_local'] ) && $row['iw_local'] == '1' ) {
                $val['local'] = true;
            }
            if ( isset( $row['iw_trans'] ) && $row['iw_trans'] == '1' ) {
                $val['trans'] = true;
            }

            if ( isset( $langNames[$prefix] ) ) {
                $val['language'] = $langNames[$prefix];
            }
            if ( in_array( $prefix, $localInterwikis ) ) {
                $val['localinterwiki'] = true;
            }
            if ( in_array( $prefix, $extraLangPrefixes ) ) {
                $val['extralanglink'] = true;

                $linktext = wfMessage( "interlanguage-link-$prefix" );
                if ( !$linktext->isDisabled() ) {
                    $val['linktext'] = $linktext->text();
                }

                $sitename = wfMessage( "interlanguage-link-sitename-$prefix" );
                if ( !$sitename->isDisabled() ) {
                    $val['sitename'] = $sitename->text();
                }
            }

            $val['url'] = wfExpandUrl( $row['iw_url'], PROTO_CURRENT );
            $val['protorel'] = substr( $row['iw_url'], 0, 2 ) == '//';
            if ( isset( $row['iw_wikiid'] ) && $row['iw_wikiid'] !== '' ) {
                $val['wikiid'] = $row['iw_wikiid'];
            }
            if ( isset( $row['iw_api'] ) && $row['iw_api'] !== '' ) {
                $val['api'] = $row['iw_api'];
            }

            $data[] = $val;
        }

        ApiResult::setIndexedTagName( $data, 'iw' );

        return $this->getResult()->addValue( 'query', $property, $data );
    }

    protected function appendDbReplLagInfo( $property, $includeAll ) {
        $data = [];
        $lb = MediaWikiServices::getInstance()->getDBLoadBalancer();
        $showHostnames = $this->getConfig()->get( 'ShowHostnames' );
        if ( $includeAll ) {
            if ( !$showHostnames ) {
                $this->dieWithError( 'apierror-siteinfo-includealldenied', 'includeAllDenied' );
            }

            $lags = $lb->getLagTimes();
            foreach ( $lags as $i => $lag ) {
                $data[] = [
                    'host' => $lb->getServerName( $i ),
                    'lag' => $lag
                ];
            }
        } else {
            list( , $lag, $index ) = $lb->getMaxLag();
            $data[] = [
                'host' => $showHostnames
                        ? $lb->getServerName( $index )
                        : '',
                'lag' => $lag
            ];
        }

        ApiResult::setIndexedTagName( $data, 'db' );

        return $this->getResult()->addValue( 'query', $property, $data );
    }

    protected function appendStatistics( $property ) {
        $data = [];
        $data['pages'] = intval( SiteStats::pages() );
        $data['articles'] = intval( SiteStats::articles() );
        $data['edits'] = intval( SiteStats::edits() );
        $data['images'] = intval( SiteStats::images() );
        $data['users'] = intval( SiteStats::users() );
        $data['activeusers'] = intval( SiteStats::activeUsers() );
        $data['admins'] = intval( SiteStats::numberingroup( 'sysop' ) );
        $data['jobs'] = intval( SiteStats::jobs() );

        Hooks::run( 'APIQuerySiteInfoStatisticsInfo', [ &$data ] );

        return $this->getResult()->addValue( 'query', $property, $data );
    }

    protected function appendUserGroups( $property, $numberInGroup ) {
        $config = $this->getConfig();

        $data = [];
        $result = $this->getResult();
        $allGroups = array_values( User::getAllGroups() );
        foreach ( $config->get( 'GroupPermissions' ) as $group => $permissions ) {
            $arr = [
                'name' => $group,
                'rights' => array_keys( $permissions, true ),
            ];

            if ( $numberInGroup ) {
                $autopromote = $config->get( 'Autopromote' );

                if ( $group == 'user' ) {
                    $arr['number'] = SiteStats::users();
                // '*' and autopromote groups have no size
                } elseif ( $group !== '*' && !isset( $autopromote[$group] ) ) {
                    $arr['number'] = SiteStats::numberingroup( $group );
                }
            }

            $groupArr = [
                'add' => $config->get( 'AddGroups' ),
                'remove' => $config->get( 'RemoveGroups' ),
                'add-self' => $config->get( 'GroupsAddToSelf' ),
                'remove-self' => $config->get( 'GroupsRemoveFromSelf' )
            ];

            foreach ( $groupArr as $type => $rights ) {
                if ( isset( $rights[$group] ) ) {
                    if ( $rights[$group] === true ) {
                        $groups = $allGroups;
                    } else {
                        $groups = array_intersect( $rights[$group], $allGroups );
                    }
                    if ( $groups ) {
                        $arr[$type] = $groups;
                        ApiResult::setArrayType( $arr[$type], 'BCarray' );
                        ApiResult::setIndexedTagName( $arr[$type], 'group' );
                    }
                }
            }

            ApiResult::setIndexedTagName( $arr['rights'], 'permission' );
            $data[] = $arr;
        }

        ApiResult::setIndexedTagName( $data, 'group' );

        return $result->addValue( 'query', $property, $data );
    }

    protected function appendFileExtensions( $property ) {
        $data = [];
        foreach ( array_unique( $this->getConfig()->get( 'FileExtensions' ) ) as $ext ) {
            $data[] = [ 'ext' => $ext ];
        }
        ApiResult::setIndexedTagName( $data, 'fe' );

        return $this->getResult()->addValue( 'query', $property, $data );
    }

    protected function appendInstalledLibraries( $property ) {
        global $IP;
        $path = "$IP/vendor/composer/installed.json";
        if ( !file_exists( $path ) ) {
            return true;
        }

        $data = [];
        $installed = new ComposerInstalled( $path );
        foreach ( $installed->getInstalledDependencies() as $name => $info ) {
            if ( strpos( $info['type'], 'mediawiki-' ) === 0 ) {
                // Skip any extensions or skins since they'll be listed
                // in their proper section
                continue;
            }
            $data[] = [
                'name' => $name,
                'version' => $info['version'],
            ];
        }
        ApiResult::setIndexedTagName( $data, 'library' );

        return $this->getResult()->addValue( 'query', $property, $data );
    }

    protected function appendExtensions( $property ) {
        $data = [];
        foreach ( $this->getConfig()->get( 'ExtensionCredits' ) as $type => $extensions ) {
            foreach ( $extensions as $ext ) {
                $ret = [];
                $ret['type'] = $type;
                if ( isset( $ext['name'] ) ) {
                    $ret['name'] = $ext['name'];
                }
                if ( isset( $ext['namemsg'] ) ) {
                    $ret['namemsg'] = $ext['namemsg'];
                }
                if ( isset( $ext['description'] ) ) {
                    $ret['description'] = $ext['description'];
                }
                if ( isset( $ext['descriptionmsg'] ) ) {
                    // Can be a string or [ key, param1, param2, ... ]
                    if ( is_array( $ext['descriptionmsg'] ) ) {
                        $ret['descriptionmsg'] = $ext['descriptionmsg'][0];
                        $ret['descriptionmsgparams'] = array_slice( $ext['descriptionmsg'], 1 );
                        ApiResult::setIndexedTagName( $ret['descriptionmsgparams'], 'param' );
                    } else {
                        $ret['descriptionmsg'] = $ext['descriptionmsg'];
                    }
                }
                if ( isset( $ext['author'] ) ) {
                    $ret['author'] = is_array( $ext['author'] ) ?
                        implode( ', ', $ext['author'] ) : $ext['author'];
                }
                if ( isset( $ext['url'] ) ) {
                    $ret['url'] = $ext['url'];
                }
                if ( isset( $ext['version'] ) ) {
                    $ret['version'] = $ext['version'];
                }
                if ( isset( $ext['path'] ) ) {
                    $extensionPath = dirname( $ext['path'] );
                    $gitInfo = new GitInfo( $extensionPath );
                    $vcsVersion = $gitInfo->getHeadSHA1();
                    if ( $vcsVersion !== false ) {
                        $ret['vcs-system'] = 'git';
                        $ret['vcs-version'] = $vcsVersion;
                        $ret['vcs-url'] = $gitInfo->getHeadViewUrl();
                        $vcsDate = $gitInfo->getHeadCommitDate();
                        if ( $vcsDate !== false ) {
                            $ret['vcs-date'] = wfTimestamp( TS_ISO_8601, $vcsDate );
                        }
                    }

                    if ( SpecialVersion::getExtLicenseFileName( $extensionPath ) ) {
                        $ret['license-name'] = $ext['license-name'] ?? '';
                        $ret['license'] = SpecialPage::getTitleFor(
                            'Version',
                            "License/{$ext['name']}"
                        )->getLinkURL();
                    }

                    if ( SpecialVersion::getExtAuthorsFileName( $extensionPath ) ) {
                        $ret['credits'] = SpecialPage::getTitleFor(
                            'Version',
                            "Credits/{$ext['name']}"
                        )->getLinkURL();
                    }
                }
                $data[] = $ret;
            }
        }

        ApiResult::setIndexedTagName( $data, 'ext' );

        return $this->getResult()->addValue( 'query', $property, $data );
    }

    protected function appendRightsInfo( $property ) {
        $config = $this->getConfig();
        $rightsPage = $config->get( 'RightsPage' );
        if ( is_string( $rightsPage ) ) {
            $title = Title::newFromText( $rightsPage );
            $url = wfExpandUrl( $title, PROTO_CURRENT );
        } else {
            $title = false;
            $url = $config->get( 'RightsUrl' );
        }
        $text = $config->get( 'RightsText' );
        if ( $title && !strlen( $text ) ) {
            $text = $title->getPrefixedText();
        }

        $data = [
            'url' => strlen( $url ) ? $url : '',
            'text' => strlen( $text ) ? $text : '',
        ];

        return $this->getResult()->addValue( 'query', $property, $data );
    }

    protected function appendRestrictions( $property ) {
        $config = $this->getConfig();
        $data = [
            'types' => $config->get( 'RestrictionTypes' ),
            'levels' => $config->get( 'RestrictionLevels' ),
            'cascadinglevels' => $config->get( 'CascadingRestrictionLevels' ),
            'semiprotectedlevels' => $config->get( 'SemiprotectedRestrictionLevels' ),
        ];

        ApiResult::setArrayType( $data['types'], 'BCarray' );
        ApiResult::setArrayType( $data['levels'], 'BCarray' );
        ApiResult::setArrayType( $data['cascadinglevels'], 'BCarray' );
        ApiResult::setArrayType( $data['semiprotectedlevels'], 'BCarray' );

        ApiResult::setIndexedTagName( $data['types'], 'type' );
        ApiResult::setIndexedTagName( $data['levels'], 'level' );
        ApiResult::setIndexedTagName( $data['cascadinglevels'], 'level' );
        ApiResult::setIndexedTagName( $data['semiprotectedlevels'], 'level' );

        return $this->getResult()->addValue( 'query', $property, $data );
    }

    public function appendLanguages( $property ) {
        $params = $this->extractRequestParams();
        $langCode = $params['inlanguagecode'] ?? '';
        $langNames = Language::fetchLanguageNames( $langCode );

        $data = [];

        foreach ( $langNames as $code => $name ) {
            $lang = [ 'code' => $code ];
            ApiResult::setContentValue( $lang, 'name', $name );
            $data[] = $lang;
        }
        ApiResult::setIndexedTagName( $data, 'lang' );

        return $this->getResult()->addValue( 'query', $property, $data );
    }

    // Export information about which page languages will trigger
    // language conversion. (T153341)
    public function appendLanguageVariants( $property ) {
        $langNames = LanguageConverter::$languagesWithVariants;
        if ( $this->getConfig()->get( 'DisableLangConversion' ) ) {
            // Ensure result is empty if language conversion is disabled.
            $langNames = [];
        }
        sort( $langNames );

        $data = [];
        foreach ( $langNames as $langCode ) {
            $lang = Language::factory( $langCode );
            if ( $lang->getConverter() instanceof FakeConverter ) {
                // Only languages which do not return instances of
                // FakeConverter implement language conversion.
                continue;
            }
            $data[$langCode] = [];
            ApiResult::setIndexedTagName( $data[$langCode], 'variant' );
            ApiResult::setArrayType( $data[$langCode], 'kvp', 'code' );

            $variants = $lang->getVariants();
            sort( $variants );
            foreach ( $variants as $v ) {
                $fallbacks = $lang->getConverter()->getVariantFallbacks( $v );
                if ( !is_array( $fallbacks ) ) {
                    $fallbacks = [ $fallbacks ];
                }
                $data[$langCode][$v] = [
                    'fallbacks' => $fallbacks,
                ];
                ApiResult::setIndexedTagName(
                    $data[$langCode][$v]['fallbacks'], 'variant'
                );
            }
        }
        ApiResult::setIndexedTagName( $data, 'lang' );
        ApiResult::setArrayType( $data, 'kvp', 'code' );

        return $this->getResult()->addValue( 'query', $property, $data );
    }

    public function appendSkins( $property ) {
        $data = [];
        $allowed = Skin::getAllowedSkins();
        $default = Skin::normalizeKey( 'default' );
        foreach ( Skin::getSkinNames() as $name => $displayName ) {
            $msg = $this->msg( "skinname-{$name}" );
            $code = $this->getParameter( 'inlanguagecode' );
            if ( $code && Language::isValidCode( $code ) ) {
                $msg->inLanguage( $code );
            } else {
                $msg->inContentLanguage();
            }
            if ( $msg->exists() ) {
                $displayName = $msg->text();
            }
            $skin = [ 'code' => $name ];
            ApiResult::setContentValue( $skin, 'name', $displayName );
            if ( !isset( $allowed[$name] ) ) {
                $skin['unusable'] = true;
            }
            if ( $name === $default ) {
                $skin['default'] = true;
            }
            $data[] = $skin;
        }
        ApiResult::setIndexedTagName( $data, 'skin' );

        return $this->getResult()->addValue( 'query', $property, $data );
    }

    public function appendExtensionTags( $property ) {
        global $wgParser;
        $tags = array_map(
            function ( $item ) {
                return "<$item>";
            },
            $wgParser->getTags()
        );
        ApiResult::setArrayType( $tags, 'BCarray' );
        ApiResult::setIndexedTagName( $tags, 't' );

        return $this->getResult()->addValue( 'query', $property, $tags );
    }

    public function appendFunctionHooks( $property ) {
        global $wgParser;
        $hooks = $wgParser->getFunctionHooks();
        ApiResult::setArrayType( $hooks, 'BCarray' );
        ApiResult::setIndexedTagName( $hooks, 'h' );

        return $this->getResult()->addValue( 'query', $property, $hooks );
    }

    public function appendVariables( $property ) {
        $variables = MediaWikiServices::getInstance()->getMagicWordFactory()->getVariableIDs();
        ApiResult::setArrayType( $variables, 'BCarray' );
        ApiResult::setIndexedTagName( $variables, 'v' );

        return $this->getResult()->addValue( 'query', $property, $variables );
    }

    public function appendProtocols( $property ) {
        // Make a copy of the global so we don't try to set the _element key of it - T47130
        $protocols = array_values( $this->getConfig()->get( 'UrlProtocols' ) );
        ApiResult::setArrayType( $protocols, 'BCarray' );
        ApiResult::setIndexedTagName( $protocols, 'p' );

        return $this->getResult()->addValue( 'query', $property, $protocols );
    }

    public function appendDefaultOptions( $property ) {
        $options = User::getDefaultOptions();
        $options[ApiResult::META_BC_BOOLS] = array_keys( $options );
        return $this->getResult()->addValue( 'query', $property, $options );
    }

    public function appendUploadDialog( $property ) {
        $config = $this->getConfig()->get( 'UploadDialog' );
        return $this->getResult()->addValue( 'query', $property, $config );
    }

    public function appendSubscribedHooks( $property ) {
        $hooks = $this->getConfig()->get( 'Hooks' );
        $myWgHooks = $hooks;
        ksort( $myWgHooks );

        $data = [];
        foreach ( $myWgHooks as $name => $subscribers ) {
            $arr = [
                'name' => $name,
                'subscribers' => array_map( [ SpecialVersion::class, 'arrayToString' ], $subscribers ),
            ];

            ApiResult::setArrayType( $arr['subscribers'], 'array' );
            ApiResult::setIndexedTagName( $arr['subscribers'], 's' );
            $data[] = $arr;
        }

        ApiResult::setIndexedTagName( $data, 'hook' );

        return $this->getResult()->addValue( 'query', $property, $data );
    }

    public function getCacheMode( $params ) {
        // Messages for $wgExtraInterlanguageLinkPrefixes depend on user language
        if (
            count( $this->getConfig()->get( 'ExtraInterlanguageLinkPrefixes' ) ) &&
            !is_null( $params['prop'] ) &&
            in_array( 'interwikimap', $params['prop'] )
        ) {
            return 'anon-public-user-private';
        }

        return 'public';
    }

    public function getAllowedParams() {
        return [
            'prop' => [
                ApiBase::PARAM_DFLT => 'general',
                ApiBase::PARAM_ISMULTI => true,
                ApiBase::PARAM_TYPE => [
                    'general',
                    'namespaces',
                    'namespacealiases',
                    'specialpagealiases',
                    'magicwords',
                    'interwikimap',
                    'dbrepllag',
                    'statistics',
                    'usergroups',
                    'libraries',
                    'extensions',
                    'fileextensions',
                    'rightsinfo',
                    'restrictions',
                    'languages',
                    'languagevariants',
                    'skins',
                    'extensiontags',
                    'functionhooks',
                    'showhooks',
                    'variables',
                    'protocols',
                    'defaultoptions',
                    'uploaddialog',
                ],
                ApiBase::PARAM_HELP_MSG_PER_VALUE => [],
            ],
            'filteriw' => [
                ApiBase::PARAM_TYPE => [
                    'local',
                    '!local',
                ]
            ],
            'showalldb' => false,
            'numberingroup' => false,
            'inlanguagecode' => null,
        ];
    }

    protected function getExamplesMessages() {
        return [
            'action=query&meta=siteinfo&siprop=general|namespaces|namespacealiases|statistics'
                => 'apihelp-query+siteinfo-example-simple',
            'action=query&meta=siteinfo&siprop=interwikimap&sifilteriw=local'
                => 'apihelp-query+siteinfo-example-interwiki',
            'action=query&meta=siteinfo&siprop=dbrepllag&sishowalldb='
                => 'apihelp-query+siteinfo-example-replag',
        ];
    }

    public function getHelpUrls() {
        return 'https://www.mediawiki.org/wiki/Special:MyLanguage/API:Siteinfo';
    }
}