wikimedia/mediawiki-core

<?php
/**
 * API for MediaWiki 1.17+
 *
 * Copyright © 2010 Sam Reed
 * Copyright © 2006 Yuri Astrakhan "<Firstname><Lastname>@gmail.com"
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 * http://www.gnu.org/copyleft/gpl.html
 *
 * @file
 */

use MediaWiki\Title\Title;
use Wikimedia\ParamValidator\ParamValidator;
use Wikimedia\ParamValidator\TypeDef\IntegerDef;

/**
 * This gives links pointing to the given interwiki
 * @ingroup API
 */
class ApiQueryIWBacklinks extends ApiQueryGeneratorBase {

    /**
     * @param ApiQuery $query
     * @param string $moduleName
     */
    public function __construct( ApiQuery $query, $moduleName ) {
        parent::__construct( $query, $moduleName, 'iwbl' );
    }

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

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

    /**
     * @param ApiPageSet|null $resultPageSet
     * @return void
     */
    public function run( $resultPageSet = null ) {
        $params = $this->extractRequestParams();

        if ( isset( $params['title'] ) && !isset( $params['prefix'] ) ) {
            $this->dieWithError(
                [
                    'apierror-invalidparammix-mustusewith',
                    $this->encodeParamName( 'title' ),
                    $this->encodeParamName( 'prefix' ),
                ],
                'invalidparammix'
            );
        }

        if ( $params['continue'] !== null ) {
            $cont = $this->parseContinueParamOrDie( $params['continue'], [ 'string', 'string', 'int' ] );
            $db = $this->getDB();
            $op = $params['dir'] == 'descending' ? '<=' : '>=';
            $this->addWhere( $db->buildComparison( $op, [
                'iwl_prefix' => $cont[0],
                'iwl_title' => $cont[1],
                'iwl_from' => $cont[2],
            ] ) );
        }

        $prop = array_fill_keys( $params['prop'], true );
        $iwprefix = isset( $prop['iwprefix'] );
        $iwtitle = isset( $prop['iwtitle'] );

        $this->addTables( [ 'iwlinks', 'page' ] );
        $this->addWhere( 'iwl_from = page_id' );

        $this->addFields( [ 'page_id', 'page_title', 'page_namespace', 'page_is_redirect',
            'iwl_from', 'iwl_prefix', 'iwl_title' ] );

        $sort = ( $params['dir'] == 'descending' ? ' DESC' : '' );
        if ( isset( $params['prefix'] ) ) {
            $this->addWhereFld( 'iwl_prefix', $params['prefix'] );
            if ( isset( $params['title'] ) ) {
                $this->addWhereFld( 'iwl_title', $params['title'] );
                $this->addOption( 'ORDER BY', 'iwl_from' . $sort );
            } else {
                $this->addOption( 'ORDER BY', [
                    'iwl_title' . $sort,
                    'iwl_from' . $sort
                ] );
            }
        } else {
            $this->addOption( 'ORDER BY', [
                'iwl_prefix' . $sort,
                'iwl_title' . $sort,
                'iwl_from' . $sort
            ] );
        }

        $this->addOption( 'LIMIT', $params['limit'] + 1 );

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

        $pages = [];

        $count = 0;
        $result = $this->getResult();

        if ( $resultPageSet === null ) {
            $this->executeGenderCacheFromResultWrapper( $res, __METHOD__ );
        }

        foreach ( $res as $row ) {
            if ( ++$count > $params['limit'] ) {
                // We've reached the one extra which shows that there are
                // additional pages to be had. Stop here...
                // Continue string preserved in case the redirect query doesn't
                // pass the limit
                $this->setContinueEnumParameter(
                    'continue',
                    "{$row->iwl_prefix}|{$row->iwl_title}|{$row->iwl_from}"
                );
                break;
            }

            if ( $resultPageSet !== null ) {
                $pages[] = Title::newFromRow( $row );
            } else {
                $entry = [ 'pageid' => (int)$row->page_id ];

                $title = Title::makeTitle( $row->page_namespace, $row->page_title );
                ApiQueryBase::addTitleInfo( $entry, $title );

                if ( $row->page_is_redirect ) {
                    $entry['redirect'] = true;
                }

                if ( $iwprefix ) {
                    $entry['iwprefix'] = $row->iwl_prefix;
                }

                if ( $iwtitle ) {
                    $entry['iwtitle'] = $row->iwl_title;
                }

                $fit = $result->addValue( [ 'query', $this->getModuleName() ], null, $entry );
                if ( !$fit ) {
                    $this->setContinueEnumParameter(
                        'continue',
                        "{$row->iwl_prefix}|{$row->iwl_title}|{$row->iwl_from}"
                    );
                    break;
                }
            }
        }

        if ( $resultPageSet === null ) {
            $result->addIndexedTagName( [ 'query', $this->getModuleName() ], 'iw' );
        } else {
            $resultPageSet->populateFromTitles( $pages );
        }
    }

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

    public function getAllowedParams() {
        return [
            'prefix' => null,
            'title' => null,
            'continue' => [
                ApiBase::PARAM_HELP_MSG => 'api-help-param-continue',
            ],
            'limit' => [
                ParamValidator::PARAM_DEFAULT => 10,
                ParamValidator::PARAM_TYPE => 'limit',
                IntegerDef::PARAM_MIN => 1,
                IntegerDef::PARAM_MAX => ApiBase::LIMIT_BIG1,
                IntegerDef::PARAM_MAX2 => ApiBase::LIMIT_BIG2
            ],
            'prop' => [
                ParamValidator::PARAM_ISMULTI => true,
                ParamValidator::PARAM_DEFAULT => '',
                ParamValidator::PARAM_TYPE => [
                    'iwprefix',
                    'iwtitle',
                ],
                ApiBase::PARAM_HELP_MSG_PER_VALUE => [],
            ],
            'dir' => [
                ParamValidator::PARAM_DEFAULT => 'ascending',
                ParamValidator::PARAM_TYPE => [
                    'ascending',
                    'descending'
                ]
            ],
        ];
    }

    protected function getExamplesMessages() {
        return [
            'action=query&list=iwbacklinks&iwbltitle=Test&iwblprefix=wikibooks'
                => 'apihelp-query+iwbacklinks-example-simple',
            'action=query&generator=iwbacklinks&giwbltitle=Test&giwblprefix=wikibooks&prop=info'
                => 'apihelp-query+iwbacklinks-example-generator',
        ];
    }

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