ApiParamInfo.php

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<?php
class ApiParamInfo extends ApiBase {

    private $helpFormat;
    private $context;

    public function __construct( ApiMain $main, $action ) {
        parent::__construct( $main, $action );
    }

    public function execute() {
        // Get parameters
        $params = $this->extractRequestParams();

        $this->helpFormat = $params['helpformat'];
        $this->context = new RequestContext;
        $this->context->setUser( new User ); // anon to avoid caching issues
        $this->context->setLanguage( $this->getMain()->getLanguage() );

        if ( is_array( $params['modules'] ) ) {
            $modules = [];
            foreach ( $params['modules'] as $path ) {
                if ( $path === '*' || $path === '**' ) {
                    $path = "main+$path";
                }
                if ( substr( $path, -2 ) === '+*' || substr( $path, -2 ) === ' *' ) {
                    $submodules = true;
                    $path = substr( $path, 0, -2 );
                    $recursive = false;
                } elseif ( substr( $path, -3 ) === '+**' || substr( $path, -3 ) === ' **' ) {
                    $submodules = true;
                    $path = substr( $path, 0, -3 );
                    $recursive = true;
                } else {
                    $submodules = false;
                }

                if ( $submodules ) {
                    try {
                        $module = $this->getModuleFromPath( $path );
                    } catch ( ApiUsageException $ex ) {
                        foreach ( $ex->getStatusValue()->getErrors() as $error ) {
                            $this->addWarning( $error );
                        }
                        continue;
                    }
                    $submodules = $this->listAllSubmodules( $module, $recursive );
                    if ( $submodules ) {
                        $modules = array_merge( $modules, $submodules );
                    } else {
                        $this->addWarning( [ 'apierror-badmodule-nosubmodules', $path ], 'badmodule' );
                    }
                } else {
                    $modules[] = $path;
                }
            }
        } else {
            $modules = [];
        }

        if ( is_array( $params['querymodules'] ) ) {
            $queryModules = $params['querymodules'];
            foreach ( $queryModules as $m ) {
                $modules[] = 'query+' . $m;
            }
        } else {
            $queryModules = [];
        }

        if ( is_array( $params['formatmodules'] ) ) {
            $formatModules = $params['formatmodules'];
            foreach ( $formatModules as $m ) {
                $modules[] = $m;
            }
        } else {
            $formatModules = [];
        }

        $modules = array_unique( $modules );

        $res = [];

        foreach ( $modules as $m ) {
            try {
                $module = $this->getModuleFromPath( $m );
            } catch ( ApiUsageException $ex ) {
                foreach ( $ex->getStatusValue()->getErrors() as $error ) {
                    $this->addWarning( $error );
                }
                continue;
            }
            $key = 'modules';

            // Back compat
            $isBCQuery = false;
            if ( $module->getParent() && $module->getParent()->getModuleName() == 'query' &&
                in_array( $module->getModuleName(), $queryModules )
            ) {
                $isBCQuery = true;
                $key = 'querymodules';
            }
            if ( in_array( $module->getModuleName(), $formatModules ) ) {
                $key = 'formatmodules';
            }

            $item = $this->getModuleInfo( $module );
            if ( $isBCQuery ) {
                $item['querytype'] = $item['group'];
            }
            $res[$key][] = $item;
        }

        $result = $this->getResult();
        $result->addValue( [ $this->getModuleName() ], 'helpformat', $this->helpFormat );

        foreach ( $res as $key => $stuff ) {
            ApiResult::setIndexedTagName( $res[$key], 'module' );
        }

        if ( $params['mainmodule'] ) {
            $res['mainmodule'] = $this->getModuleInfo( $this->getMain() );
        }

        if ( $params['pagesetmodule'] ) {
            $pageSet = new ApiPageSet( $this->getMain()->getModuleManager()->getModule( 'query' ) );
            $res['pagesetmodule'] = $this->getModuleInfo( $pageSet );
            unset( $res['pagesetmodule']['name'] );
            unset( $res['pagesetmodule']['path'] );
            unset( $res['pagesetmodule']['group'] );
        }

        $result->addValue( null, $this->getModuleName(), $res );
    }

    private function listAllSubmodules( ApiBase $module, $recursive ) {
        $manager = $module->getModuleManager();
        if ( $manager ) {
            $paths = [];
            $names = $manager->getNames();
            sort( $names );
            foreach ( $names as $name ) {
                $submodule = $manager->getModule( $name );
                $paths[] = $submodule->getModulePath();
                if ( $recursive && $submodule->getModuleManager() ) {
                    $paths = array_merge( $paths, $this->listAllSubmodules( $submodule, $recursive ) );
                }
            }
        }
        return $paths;
    }

    protected function formatHelpMessages( array &$res, $key, array $msgs, $joinLists = false ) {
        switch ( $this->helpFormat ) {
            case 'none':
                break;

            case 'wikitext':
                $ret = [];
                foreach ( $msgs as $m ) {
                    $ret[] = $m->setContext( $this->context )->text();
                }
                $res[$key] = implode( "\n\n", $ret );
                if ( $joinLists ) {
                    $res[$key] = preg_replace( '!^(([*#:;])[^\n]*)\n\n(?=\2)!m', "$1\n", $res[$key] );
                }
                break;

            case 'html':
                $ret = [];
                foreach ( $msgs as $m ) {
                    $ret[] = $m->setContext( $this->context )->parseAsBlock();
                }
                $ret = implode( "\n", $ret );
                if ( $joinLists ) {
                    $ret = preg_replace( '!\s*</([oud]l)>\s*<\1>\s*!', "\n", $ret );
                }
                $res[$key] = Parser::stripOuterParagraph( $ret );
                break;

            case 'raw':
                $res[$key] = [];
                foreach ( $msgs as $m ) {
                    $a = [
                        'key' => $m->getKey(),
                        'params' => $m->getParams(),
                    ];
                    ApiResult::setIndexedTagName( $a['params'], 'param' );
                    if ( $m instanceof ApiHelpParamValueMessage ) {
                        $a['forvalue'] = $m->getParamValue();
                    }
                    $res[$key][] = $a;
                }
                ApiResult::setIndexedTagName( $res[$key], 'msg' );
                break;
        }
    }

    private function getModuleInfo( $module ) {
        $ret = [];
        $path = $module->getModulePath();

        $ret['name'] = $module->getModuleName();
        $ret['classname'] = get_class( $module );
        $ret['path'] = $path;
        if ( !$module->isMain() ) {
            $ret['group'] = $module->getParent()->getModuleManager()->getModuleGroup(
                $module->getModuleName()
            );
        }
        $ret['prefix'] = $module->getModulePrefix();

        $sourceInfo = $module->getModuleSourceInfo();
        if ( $sourceInfo ) {
            $ret['source'] = $sourceInfo['name'];
            if ( isset( $sourceInfo['namemsg'] ) ) {
                $ret['sourcename'] = $this->context->msg( $sourceInfo['namemsg'] )->text();
            } else {
                $ret['sourcename'] = $ret['source'];
            }

            $link = SpecialPage::getTitleFor( 'Version', 'License/' . $sourceInfo['name'] )->getFullURL();
            if ( isset( $sourceInfo['license-name'] ) ) {
                $ret['licensetag'] = $sourceInfo['license-name'];
                $ret['licenselink'] = (string)$link;
            } elseif ( SpecialVersion::getExtLicenseFileName( dirname( $sourceInfo['path'] ) ) ) {
                $ret['licenselink'] = (string)$link;
            }
        }

        $this->formatHelpMessages( $ret, 'description', $module->getFinalDescription() );

        foreach ( $module->getHelpFlags() as $flag ) {
            $ret[$flag] = true;
        }

        $ret['helpurls'] = (array)$module->getHelpUrls();
        if ( isset( $ret['helpurls'][0] ) && $ret['helpurls'][0] === false ) {
            $ret['helpurls'] = [];
        }
        ApiResult::setIndexedTagName( $ret['helpurls'], 'helpurl' );

        if ( $this->helpFormat !== 'none' ) {
            $ret['examples'] = [];
            $examples = $module->getExamplesMessages();
            foreach ( $examples as $qs => $msg ) {
                $item = [
                    'query' => $qs
                ];
                $msg = ApiBase::makeMessage( $msg, $this->context, [
                    $module->getModulePrefix(),
                    $module->getModuleName(),
                    $module->getModulePath()
                ] );
                $this->formatHelpMessages( $item, 'description', [ $msg ] );
                if ( isset( $item['description'] ) ) {
                    if ( is_array( $item['description'] ) ) {
                        $item['description'] = $item['description'][0];
                    } else {
                        ApiResult::setSubelementsList( $item, 'description' );
                    }
                }
                $ret['examples'][] = $item;
            }
            ApiResult::setIndexedTagName( $ret['examples'], 'example' );
        }

        $ret['parameters'] = [];
        $ret['templatedparameters'] = [];
        $params = $module->getFinalParams( ApiBase::GET_VALUES_FOR_HELP );
        $paramDesc = $module->getFinalParamDescription();
        $index = 0;
        foreach ( $params as $name => $settings ) {
            if ( !is_array( $settings ) ) {
                $settings = [ ApiBase::PARAM_DFLT => $settings ];
            }

            $item = [
                'index' => ++$index,
                'name' => $name,
            ];

            if ( !empty( $settings[ApiBase::PARAM_TEMPLATE_VARS] ) ) {
                $item['templatevars'] = $settings[ApiBase::PARAM_TEMPLATE_VARS];
                ApiResult::setIndexedTagName( $item['templatevars'], 'var' );
            }

            if ( isset( $paramDesc[$name] ) ) {
                $this->formatHelpMessages( $item, 'description', $paramDesc[$name], true );
            }

            $item['required'] = !empty( $settings[ApiBase::PARAM_REQUIRED] );

            if ( !empty( $settings[ApiBase::PARAM_DEPRECATED] ) ) {
                $item['deprecated'] = true;
            }

            if ( $name === 'token' && $module->needsToken() ) {
                $item['tokentype'] = $module->needsToken();
            }

            if ( !isset( $settings[ApiBase::PARAM_TYPE] ) ) {
                $dflt = $settings[ApiBase::PARAM_DFLT] ?? null;
                if ( is_bool( $dflt ) ) {
                    $settings[ApiBase::PARAM_TYPE] = 'boolean';
                } elseif ( is_string( $dflt ) || is_null( $dflt ) ) {
                    $settings[ApiBase::PARAM_TYPE] = 'string';
                } elseif ( is_int( $dflt ) ) {
                    $settings[ApiBase::PARAM_TYPE] = 'integer';
                }
            }

            if ( isset( $settings[ApiBase::PARAM_DFLT] ) ) {
                switch ( $settings[ApiBase::PARAM_TYPE] ) {
                    case 'boolean':
                        $item['default'] = (bool)$settings[ApiBase::PARAM_DFLT];
                        break;
                    case 'string':
                    case 'text':
                    case 'password':
                        $item['default'] = strval( $settings[ApiBase::PARAM_DFLT] );
                        break;
                    case 'integer':
                    case 'limit':
                        $item['default'] = (int)$settings[ApiBase::PARAM_DFLT];
                        break;
                    case 'timestamp':
                        $item['default'] = wfTimestamp( TS_ISO_8601, $settings[ApiBase::PARAM_DFLT] );
                        break;
                    default:
                        $item['default'] = $settings[ApiBase::PARAM_DFLT];
                        break;
                }
            }

            $item['multi'] = !empty( $settings[ApiBase::PARAM_ISMULTI] );
            if ( $item['multi'] ) {
                $item['lowlimit'] = !empty( $settings[ApiBase::PARAM_ISMULTI_LIMIT1] )
                    ? $settings[ApiBase::PARAM_ISMULTI_LIMIT1]
                    : ApiBase::LIMIT_SML1;
                $item['highlimit'] = !empty( $settings[ApiBase::PARAM_ISMULTI_LIMIT2] )
                    ? $settings[ApiBase::PARAM_ISMULTI_LIMIT2]
                    : ApiBase::LIMIT_SML2;
                $item['limit'] = $this->getMain()->canApiHighLimits()
                    ? $item['highlimit']
                    : $item['lowlimit'];
            }

            if ( !empty( $settings[ApiBase::PARAM_ALLOW_DUPLICATES] ) ) {
                $item['allowsduplicates'] = true;
            }

            if ( isset( $settings[ApiBase::PARAM_TYPE] ) ) {
                if ( $settings[ApiBase::PARAM_TYPE] === 'submodule' ) {
                    if ( isset( $settings[ApiBase::PARAM_SUBMODULE_MAP] ) ) {
                        ksort( $settings[ApiBase::PARAM_SUBMODULE_MAP] );
                        $item['type'] = array_keys( $settings[ApiBase::PARAM_SUBMODULE_MAP] );
                        $item['submodules'] = $settings[ApiBase::PARAM_SUBMODULE_MAP];
                    } else {
                        $item['type'] = $module->getModuleManager()->getNames( $name );
                        sort( $item['type'] );
                        $prefix = $module->isMain()
                            ? '' : ( $module->getModulePath() . '+' );
                        $item['submodules'] = [];
                        foreach ( $item['type'] as $v ) {
                            $item['submodules'][$v] = $prefix . $v;
                        }
                    }
                    if ( isset( $settings[ApiBase::PARAM_SUBMODULE_PARAM_PREFIX] ) ) {
                        $item['submoduleparamprefix'] = $settings[ApiBase::PARAM_SUBMODULE_PARAM_PREFIX];
                    }

                    $deprecatedSubmodules = [];
                    foreach ( $item['submodules'] as $v => $submodulePath ) {
                        try {
                            $submod = $this->getModuleFromPath( $submodulePath );
                            if ( $submod && $submod->isDeprecated() ) {
                                $deprecatedSubmodules[] = $v;
                            }
                        } catch ( ApiUsageException $ex ) {
                            // Ignore
                        }
                    }
                    if ( $deprecatedSubmodules ) {
                        $item['type'] = array_merge(
                            array_diff( $item['type'], $deprecatedSubmodules ),
                            $deprecatedSubmodules
                        );
                        $item['deprecatedvalues'] = $deprecatedSubmodules;
                    }
                } elseif ( $settings[ApiBase::PARAM_TYPE] === 'tags' ) {
                    $item['type'] = ChangeTags::listExplicitlyDefinedTags();
                } else {
                    $item['type'] = $settings[ApiBase::PARAM_TYPE];
                }
                if ( is_array( $item['type'] ) ) {
                    // To prevent sparse arrays from being serialized to JSON as objects
                    $item['type'] = array_values( $item['type'] );
                    ApiResult::setIndexedTagName( $item['type'], 't' );
                }

                // Add 'allspecifier' if applicable
                if ( $item['type'] === 'namespace' ) {
                    $allowAll = true;
                    $allSpecifier = ApiBase::ALL_DEFAULT_STRING;
                } else {
                    $allowAll = $settings[ApiBase::PARAM_ALL] ?? false;
                    $allSpecifier = ( is_string( $allowAll ) ? $allowAll : ApiBase::ALL_DEFAULT_STRING );
                }
                if ( $allowAll && $item['multi'] &&
                    ( is_array( $item['type'] ) || $item['type'] === 'namespace' ) ) {
                    $item['allspecifier'] = $allSpecifier;
                }

                if ( $item['type'] === 'namespace' &&
                    isset( $settings[ApiBase::PARAM_EXTRA_NAMESPACES] ) &&
                    is_array( $settings[ApiBase::PARAM_EXTRA_NAMESPACES] )
                ) {
                    $item['extranamespaces'] = $settings[ApiBase::PARAM_EXTRA_NAMESPACES];
                    ApiResult::setArrayType( $item['extranamespaces'], 'array' );
                    ApiResult::setIndexedTagName( $item['extranamespaces'], 'ns' );
                }
            }
            if ( isset( $settings[ApiBase::PARAM_MAX] ) ) {
                $item['max'] = $settings[ApiBase::PARAM_MAX];
            }
            if ( isset( $settings[ApiBase::PARAM_MAX2] ) ) {
                $item['highmax'] = $settings[ApiBase::PARAM_MAX2];
            }
            if ( isset( $settings[ApiBase::PARAM_MIN] ) ) {
                $item['min'] = $settings[ApiBase::PARAM_MIN];
            }
            if ( !empty( $settings[ApiBase::PARAM_RANGE_ENFORCE] ) ) {
                $item['enforcerange'] = true;
            }
            if ( isset( $settings[self::PARAM_MAX_BYTES] ) ) {
                $item['maxbytes'] = $settings[self::PARAM_MAX_BYTES];
            }
            if ( isset( $settings[self::PARAM_MAX_CHARS] ) ) {
                $item['maxchars'] = $settings[self::PARAM_MAX_CHARS];
            }
            if ( !empty( $settings[ApiBase::PARAM_DEPRECATED_VALUES] ) ) {
                $deprecatedValues = array_keys( $settings[ApiBase::PARAM_DEPRECATED_VALUES] );
                if ( is_array( $item['type'] ) ) {
                    $deprecatedValues = array_intersect( $deprecatedValues, $item['type'] );
                }
                if ( $deprecatedValues ) {
                    $item['deprecatedvalues'] = array_values( $deprecatedValues );
                    ApiResult::setIndexedTagName( $item['deprecatedvalues'], 'v' );
                }
            }

            if ( !empty( $settings[ApiBase::PARAM_HELP_MSG_INFO] ) ) {
                $item['info'] = [];
                foreach ( $settings[ApiBase::PARAM_HELP_MSG_INFO] as $i ) {
                    $tag = array_shift( $i );
                    $info = [
                        'name' => $tag,
                    ];
                    if ( count( $i ) ) {
                        $info['values'] = $i;
                        ApiResult::setIndexedTagName( $info['values'], 'v' );
                    }
                    $this->formatHelpMessages( $info, 'text', [
                        $this->context->msg( "apihelp-{$path}-paraminfo-{$tag}" )
                            ->numParams( count( $i ) )
                            ->params( $this->context->getLanguage()->commaList( $i ) )
                            ->params( $module->getModulePrefix() )
                    ] );
                    ApiResult::setSubelementsList( $info, 'text' );
                    $item['info'][] = $info;
                }
                ApiResult::setIndexedTagName( $item['info'], 'i' );
            }

            $key = empty( $settings[ApiBase::PARAM_TEMPLATE_VARS] ) ? 'parameters' : 'templatedparameters';
            $ret[$key][] = $item;
        }
        ApiResult::setIndexedTagName( $ret['parameters'], 'param' );
        ApiResult::setIndexedTagName( $ret['templatedparameters'], 'param' );

        $dynamicParams = $module->dynamicParameterDocumentation();
        if ( $dynamicParams !== null ) {
            if ( $this->helpFormat === 'none' ) {
                $ret['dynamicparameters'] = true;
            } else {
                $dynamicParams = ApiBase::makeMessage( $dynamicParams, $this->context, [
                    $module->getModulePrefix(),
                    $module->getModuleName(),
                    $module->getModulePath()
                ] );
                $this->formatHelpMessages( $ret, 'dynamicparameters', [ $dynamicParams ] );
            }
        }

        return $ret;
    }

    public function isReadMode() {
        return false;
    }

    public function getAllowedParams() {
        // back compat
        $querymodules = $this->getMain()->getModuleManager()
            ->getModule( 'query' )->getModuleManager()->getNames();
        sort( $querymodules );
        $formatmodules = $this->getMain()->getModuleManager()->getNames( 'format' );
        sort( $formatmodules );

        return [
            'modules' => [
                ApiBase::PARAM_ISMULTI => true,
            ],
            'helpformat' => [
                ApiBase::PARAM_DFLT => 'none',
                ApiBase::PARAM_TYPE => [ 'html', 'wikitext', 'raw', 'none' ],
            ],

            'querymodules' => [
                ApiBase::PARAM_DEPRECATED => true,
                ApiBase::PARAM_ISMULTI => true,
                ApiBase::PARAM_TYPE => $querymodules,
            ],
            'mainmodule' => [
                ApiBase::PARAM_DEPRECATED => true,
            ],
            'pagesetmodule' => [
                ApiBase::PARAM_DEPRECATED => true,
            ],
            'formatmodules' => [
                ApiBase::PARAM_DEPRECATED => true,
                ApiBase::PARAM_ISMULTI => true,
                ApiBase::PARAM_TYPE => $formatmodules,
            ]
        ];
    }

    protected function getExamplesMessages() {
        return [
            'action=paraminfo&modules=parse|phpfm|query%2Ballpages|query%2Bsiteinfo'
                => 'apihelp-paraminfo-example-1',
            'action=paraminfo&modules=query%2B*'
                => 'apihelp-paraminfo-example-2',
        ];
    }

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