ApiQueryImages.php

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<?php
class ApiQueryImages extends ApiQueryGeneratorBase {

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

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

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

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

                $params = $this->extractRequestParams();
                $this->addFields( array(
                        'il_from',
                        'il_to'
                ) );

                $this->addTables( 'imagelinks' );
                $this->addWhereFld( 'il_from', array_keys( $this->getPageSet()->getGoodTitles() ) );
                if ( !is_null( $params['continue'] ) ) {
                        $cont = explode( '|', $params['continue'] );
                        if ( count( $cont ) != 2 ) {
                                $this->dieUsage( 'Invalid continue param. You should pass the ' .
                                        'original value returned by the previous query', '_badcontinue' );
                        }
                        $op = $params['dir'] == 'descending' ? '<' : '>';
                        $ilfrom = intval( $cont[0] );
                        $ilto = $this->getDB()->addQuotes( $cont[1] );
                        $this->addWhere(
                                "il_from $op $ilfrom OR " .
                                "(il_from = $ilfrom AND " .
                                "il_to $op= $ilto)"
                        );
                }

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

                if ( !is_null( $params['images'] ) ) {
                        $images = array();
                        foreach ( $params['images'] as $img ) {
                                $title = Title::newFromText( $img );
                                if ( !$title || $title->getNamespace() != NS_FILE ) {
                                        $this->setWarning( "\"$img\" is not a file" );
                                } else {
                                        $images[] = $title->getDBkey();
                                }
                        }
                        $this->addWhereFld( 'il_to', $images );
                }

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

                if ( is_null( $resultPageSet ) ) {
                        $count = 0;
                        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->il_from . '|' . $row->il_to );
                                        break;
                                }
                                $vals = array();
                                ApiQueryBase::addTitleInfo( $vals, Title::makeTitle( NS_FILE, $row->il_to ) );
                                $fit = $this->addPageSubItem( $row->il_from, $vals );
                                if ( !$fit ) {
                                        $this->setContinueEnumParameter( 'continue', $row->il_from . '|' . $row->il_to );
                                        break;
                                }
                        }
                } else {
                        $titles = array();
                        $count = 0;
                        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->il_from . '|' . $row->il_to );
                                        break;
                                }
                                $titles[] = Title::makeTitle( NS_FILE, $row->il_to );
                        }
                        $resultPageSet->populateFromTitles( $titles );
                }
        }

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

        public function getAllowedParams() {
                return array(
                        '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
                        ),
                        'continue' => null,
                        'images' => array(
                                ApiBase::PARAM_ISMULTI => true,
                        ),
                        'dir' => array(
                                ApiBase::PARAM_DFLT => 'ascending',
                                ApiBase::PARAM_TYPE => array(
                                        'ascending',
                                        'descending'
                                )
                        ),
                );
        }

        public function getParamDescription() {
                return array(
                        'limit' => 'How many images to return',
                        'continue' => 'When more results are available, use this to continue',
                        'images' => 'Only list these images. Useful for checking whether a certain page has a certain Image.',
                        'dir' => 'The direction in which to list',
                );
        }

        public function getResultProperties() {
                return array(
                        '' => array(
                                'ns' => 'namespace',
                                'title' => 'string'
                        )
                );
        }

        public function getDescription() {
                return 'Returns all images contained on the given page(s)';
        }

        public function getPossibleErrors() {
                return array_merge( parent::getPossibleErrors(), array(
                        array( 'code' => '_badcontinue', 'info' => 'Invalid continue param. You should pass the original value returned by the previous query' ),
                ) );
        }

        public function getExamples() {
                return array(
                        'api.php?action=query&prop=images&titles=Main%20Page' => 'Get a list of images used in the [[Main Page]]',
                        'api.php?action=query&generator=images&titles=Main%20Page&prop=info' => 'Get information about all images used in the [[Main Page]]',
                );
        }

        public function getHelpUrls() {
                return 'https://www.mediawiki.org/wiki/API:Properties#images_.2F_im';
        }

        public function getVersion() {
                return __CLASS__ . ': $Id$';
        }
}