ApiQueryExtLinksUsage.php

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<?php
class ApiQueryExtLinksUsage extends ApiQueryGeneratorBase {

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

    public function execute() {
        $this->run();
    }

    public function getCacheMode( $params ) {
        return 'public';
    }

    public function executeGenerator( $resultPageSet ) {
        $this->run( $resultPageSet );
    }

    private function run( $resultPageSet = null ) {
        $params = $this->extractRequestParams();

        $query = $params['query'];
        $protocol = self::getProtocolPrefix( $params['protocol'] );

        $this->addTables( array( 'page', 'externallinks' ) ); // must be in this order for 'USE INDEX'
        $this->addOption( 'USE INDEX', 'el_index' );
        $this->addWhere( 'page_id=el_from' );

        $miser_ns = array();
        if ( $this->getConfig()->get( 'MiserMode' ) ) {
            $miser_ns = $params['namespace'];
        } else {
            $this->addWhereFld( 'page_namespace', $params['namespace'] );
        }

        $whereQuery = $this->prepareUrlQuerySearchString( $query, $protocol );

        if ( $whereQuery !== null ) {
            $this->addWhere( $whereQuery );
        }

        $prop = array_flip( $params['prop'] );
        $fld_ids = isset( $prop['ids'] );
        $fld_title = isset( $prop['title'] );
        $fld_url = isset( $prop['url'] );

        if ( is_null( $resultPageSet ) ) {
            $this->addFields( array(
                'page_id',
                'page_namespace',
                'page_title'
            ) );
            $this->addFieldsIf( 'el_to', $fld_url );
        } else {
            $this->addFields( $resultPageSet->getPageTableFields() );
        }

        $limit = $params['limit'];
        $offset = $params['offset'];
        $this->addOption( 'LIMIT', $limit + 1 );
        if ( isset( $offset ) ) {
            $this->addOption( 'OFFSET', $offset );
        }

        $res = $this->select( __METHOD__ );

        $result = $this->getResult();
        $count = 0;
        foreach ( $res as $row ) {
            if ( ++$count > $limit ) {
                // We've reached the one extra which shows that there are
                // additional pages to be had. Stop here...
                $this->setContinueEnumParameter( 'offset', $offset + $limit );
                break;
            }

            if ( count( $miser_ns ) && !in_array( $row->page_namespace, $miser_ns ) ) {
                continue;
            }

            if ( is_null( $resultPageSet ) ) {
                $vals = array();
                if ( $fld_ids ) {
                    $vals['pageid'] = intval( $row->page_id );
                }
                if ( $fld_title ) {
                    $title = Title::makeTitle( $row->page_namespace, $row->page_title );
                    ApiQueryBase::addTitleInfo( $vals, $title );
                }
                if ( $fld_url ) {
                    $to = $row->el_to;
                    // expand protocol-relative urls
                    if ( $params['expandurl'] ) {
                        $to = wfExpandUrl( $to, PROTO_CANONICAL );
                    }
                    $vals['url'] = $to;
                }
                $fit = $result->addValue( array( 'query', $this->getModuleName() ), null, $vals );
                if ( !$fit ) {
                    $this->setContinueEnumParameter( 'offset', $offset + $count - 1 );
                    break;
                }
            } else {
                $resultPageSet->processDbRow( $row );
            }
        }

        if ( is_null( $resultPageSet ) ) {
            $result->setIndexedTagName_internal( array( 'query', $this->getModuleName() ),
                $this->getModulePrefix() );
        }
    }

    public function getAllowedParams() {
        return array(
            'prop' => array(
                ApiBase::PARAM_ISMULTI => true,
                ApiBase::PARAM_DFLT => 'ids|title|url',
                ApiBase::PARAM_TYPE => array(
                    'ids',
                    'title',
                    'url'
                )
            ),
            'offset' => array(
                ApiBase::PARAM_TYPE => 'integer'
            ),
            'protocol' => array(
                ApiBase::PARAM_TYPE => self::prepareProtocols(),
                ApiBase::PARAM_DFLT => '',
            ),
            'query' => null,
            'namespace' => array(
                ApiBase::PARAM_ISMULTI => true,
                ApiBase::PARAM_TYPE => 'namespace'
            ),
            'limit' => array(
                ApiBase::PARAM_DFLT => 10,
                ApiBase::PARAM_TYPE => 'limit',
                ApiBase::PARAM_MIN => 1,
                ApiBase::PARAM_MAX => ApiBase::LIMIT_BIG1,
                ApiBase::PARAM_MAX2 => ApiBase::LIMIT_BIG2
            ),
            'expandurl' => false,
        );
    }

    public static function prepareProtocols() {
        global $wgUrlProtocols;
        $protocols = array( '' );
        foreach ( $wgUrlProtocols as $p ) {
            if ( $p !== '//' ) {
                $protocols[] = substr( $p, 0, strpos( $p, ':' ) );
            }
        }

        return $protocols;
    }

    public static function getProtocolPrefix( $protocol ) {
        // Find the right prefix
        global $wgUrlProtocols;
        if ( $protocol && !in_array( $protocol, $wgUrlProtocols ) ) {
            foreach ( $wgUrlProtocols as $p ) {
                if ( substr( $p, 0, strlen( $protocol ) ) === $protocol ) {
                    $protocol = $p;
                    break;
                }
            }

            return $protocol;
        } else {
            return null;
        }
    }

    public function getParamDescription() {
        $p = $this->getModulePrefix();
        $desc = array(
            'prop' => array(
                'What pieces of information to include',
                ' ids    - Adds the ID of page',
                ' title  - Adds the title and namespace ID of the page',
                ' url    - Adds the URL used in the page',
            ),
            'offset' => 'Used for paging. Use the value returned for "continue"',
            'protocol' => array(
                "Protocol of the URL. If empty and {$p}query set, the protocol is http.",
                "Leave both this and {$p}query empty to list all external links"
            ),
            'query' => 'Search string without protocol. See [[Special:LinkSearch]]. ' .
                'Leave empty to list all external links',
            'namespace' => 'The page namespace(s) to enumerate.',
            'limit' => 'How many pages to return.',
            'expandurl' => 'Expand protocol-relative URLs with the canonical protocol',
        );

        if ( $this->getConfig()->get( 'MiserMode' ) ) {
            $desc['namespace'] = array(
                $desc['namespace'],
                "NOTE: Due to \$wgMiserMode, using this may result in fewer than \"{$p}limit\" results",
                'returned before continuing; in extreme cases, zero results may be returned',
            );
        }

        return $desc;
    }

    public function getDescription() {
        return 'Enumerate pages that contain a given URL.';
    }

    public function getExamples() {
        return array(
            'api.php?action=query&list=exturlusage&euquery=www.mediawiki.org'
        );
    }

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