ApiQueryCategories.php

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<?php
class ApiQueryCategories extends ApiQueryGeneratorBase {

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

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

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

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

    private function run( $resultPageSet = null ) {
        if ( $this->getPageSet()->getGoodTitleCount() == 0 ) {
            return; // nothing to do
        }

        $params = $this->extractRequestParams();
        $prop = array_flip( (array)$params['prop'] );
        $show = array_flip( (array)$params['show'] );

        $this->addFields( [
            'cl_from',
            'cl_to'
        ] );

        $this->addFieldsIf( [ 'cl_sortkey', 'cl_sortkey_prefix' ], isset( $prop['sortkey'] ) );
        $this->addFieldsIf( 'cl_timestamp', isset( $prop['timestamp'] ) );

        $this->addTables( 'categorylinks' );
        $this->addWhereFld( 'cl_from', array_keys( $this->getPageSet()->getGoodTitles() ) );
        if ( !is_null( $params['categories'] ) ) {
            $cats = [];
            foreach ( $params['categories'] as $cat ) {
                $title = Title::newFromText( $cat );
                if ( !$title || $title->getNamespace() != NS_CATEGORY ) {
                    $this->setWarning( "\"$cat\" is not a category" );
                } else {
                    $cats[] = $title->getDBkey();
                }
            }
            $this->addWhereFld( 'cl_to', $cats );
        }

        if ( !is_null( $params['continue'] ) ) {
            $cont = explode( '|', $params['continue'] );
            $this->dieContinueUsageIf( count( $cont ) != 2 );
            $op = $params['dir'] == 'descending' ? '<' : '>';
            $clfrom = intval( $cont[0] );
            $clto = $this->getDB()->addQuotes( $cont[1] );
            $this->addWhere(
                "cl_from $op $clfrom OR " .
                "(cl_from = $clfrom AND " .
                "cl_to $op= $clto)"
            );
        }

        if ( isset( $show['hidden'] ) && isset( $show['!hidden'] ) ) {
            $this->dieUsageMsg( 'show' );
        }
        if ( isset( $show['hidden'] ) || isset( $show['!hidden'] ) || isset( $prop['hidden'] ) ) {
            $this->addOption( 'STRAIGHT_JOIN' );
            $this->addTables( [ 'page', 'page_props' ] );
            $this->addFieldsIf( 'pp_propname', isset( $prop['hidden'] ) );
            $this->addJoinConds( [
                'page' => [ 'LEFT JOIN', [
                    'page_namespace' => NS_CATEGORY,
                    'page_title = cl_to' ] ],
                'page_props' => [ 'LEFT JOIN', [
                    'pp_page=page_id',
                    'pp_propname' => 'hiddencat' ] ]
            ] );
            if ( isset( $show['hidden'] ) ) {
                $this->addWhere( [ 'pp_propname IS NOT NULL' ] );
            } elseif ( isset( $show['!hidden'] ) ) {
                $this->addWhere( [ 'pp_propname IS NULL' ] );
            }
        }

        $sort = ( $params['dir'] == 'descending' ? ' DESC' : '' );
        // Don't order by cl_from if it's constant in the WHERE clause
        if ( count( $this->getPageSet()->getGoodTitles() ) == 1 ) {
            $this->addOption( 'ORDER BY', 'cl_to' . $sort );
        } else {
            $this->addOption( 'ORDER BY', [
                'cl_from' . $sort,
                'cl_to' . $sort
            ] );
        }

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

        $count = 0;
        if ( is_null( $resultPageSet ) ) {
            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...
                    $this->setContinueEnumParameter( 'continue', $row->cl_from . '|' . $row->cl_to );
                    break;
                }

                $title = Title::makeTitle( NS_CATEGORY, $row->cl_to );
                $vals = [];
                ApiQueryBase::addTitleInfo( $vals, $title );
                if ( isset( $prop['sortkey'] ) ) {
                    $vals['sortkey'] = bin2hex( $row->cl_sortkey );
                    $vals['sortkeyprefix'] = $row->cl_sortkey_prefix;
                }
                if ( isset( $prop['timestamp'] ) ) {
                    $vals['timestamp'] = wfTimestamp( TS_ISO_8601, $row->cl_timestamp );
                }
                if ( isset( $prop['hidden'] ) ) {
                    $vals['hidden'] = !is_null( $row->pp_propname );
                }

                $fit = $this->addPageSubItem( $row->cl_from, $vals );
                if ( !$fit ) {
                    $this->setContinueEnumParameter( 'continue', $row->cl_from . '|' . $row->cl_to );
                    break;
                }
            }
        } else {
            $titles = [];
            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...
                    $this->setContinueEnumParameter( 'continue', $row->cl_from . '|' . $row->cl_to );
                    break;
                }

                $titles[] = Title::makeTitle( NS_CATEGORY, $row->cl_to );
            }
            $resultPageSet->populateFromTitles( $titles );
        }
    }

    public function getAllowedParams() {
        return [
            'prop' => [
                ApiBase::PARAM_ISMULTI => true,
                ApiBase::PARAM_TYPE => [
                    'sortkey',
                    'timestamp',
                    'hidden',
                ],
                ApiBase::PARAM_HELP_MSG_PER_VALUE => [],
            ],
            'show' => [
                ApiBase::PARAM_ISMULTI => true,
                ApiBase::PARAM_TYPE => [
                    'hidden',
                    '!hidden',
                ]
            ],
            'limit' => [
                ApiBase::PARAM_DFLT => 10,
                ApiBase::PARAM_TYPE => 'limit',
                ApiBase::PARAM_MIN => 1,
                ApiBase::PARAM_MAX => ApiBase::LIMIT_BIG1,
                ApiBase::PARAM_MAX2 => ApiBase::LIMIT_BIG2
            ],
            'continue' => [
                ApiBase::PARAM_HELP_MSG => 'api-help-param-continue',
            ],
            'categories' => [
                ApiBase::PARAM_ISMULTI => true,
            ],
            'dir' => [
                ApiBase::PARAM_DFLT => 'ascending',
                ApiBase::PARAM_TYPE => [
                    'ascending',
                    'descending'
                ]
            ],
        ];
    }

    protected function getExamplesMessages() {
        return [
            'action=query&prop=categories&titles=Albert%20Einstein'
                => 'apihelp-query+categories-example-simple',
            'action=query&generator=categories&titles=Albert%20Einstein&prop=info'
                => 'apihelp-query+categories-example-generator',
        ];
    }

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