ApiQuerySearch.php

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<?php
class ApiQuerySearch extends ApiQueryGeneratorBase {

    const BACKEND_NULL_PARAM = 'database-backed';

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

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

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

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

        // Extract parameters
        $limit = $params['limit'];
        $query = $params['search'];
        $what = $params['what'];
        $searchInfo = array_flip( $params['info'] );
        $prop = array_flip( $params['prop'] );

        // Create search engine instance and set options
        $search = isset( $params['backend'] ) && $params['backend'] != self::BACKEND_NULL_PARAM ?
            SearchEngine::create( $params['backend'] ) : SearchEngine::create();
        $search->setLimitOffset( $limit + 1, $params['offset'] );
        $search->setNamespaces( $params['namespace'] );
        $search->showRedirects = $params['redirects'];

        $query = $search->transformSearchTerm( $query );
        $query = $search->replacePrefixes( $query );

        // Perform the actual search
        if ( $what == 'text' ) {
            $matches = $search->searchText( $query );
        } elseif ( $what == 'title' ) {
            $matches = $search->searchTitle( $query );
        } elseif ( $what == 'nearmatch' ) {
            $matches = SearchEngine::getNearMatchResultSet( $query );
        } else {
            // We default to title searches; this is a terrible legacy
            // of the way we initially set up the MySQL fulltext-based
            // search engine with separate title and text fields.
            // In the future, the default should be for a combined index.
            $what = 'title';
            $matches = $search->searchTitle( $query );

            // Not all search engines support a separate title search,
            // for instance the Lucene-based engine we use on Wikipedia.
            // In this case, fall back to full-text search (which will
            // include titles in it!)
            if ( is_null( $matches ) ) {
                $what = 'text';
                $matches = $search->searchText( $query );
            }
        }
        if ( is_null( $matches ) ) {
            $this->dieUsage( "{$what} search is disabled", "search-{$what}-disabled" );
        } elseif ( $matches instanceof Status && !$matches->isGood() ) {
            $this->dieUsage( $matches->getWikiText(), 'search-error' );
        }

        $apiResult = $this->getResult();
        // Add search meta data to result
        if ( isset( $searchInfo['totalhits'] ) ) {
            $totalhits = $matches->getTotalHits();
            if ( $totalhits !== null ) {
                $apiResult->addValue( array( 'query', 'searchinfo' ),
                        'totalhits', $totalhits );
            }
        }
        if ( isset( $searchInfo['suggestion'] ) && $matches->hasSuggestion() ) {
            $apiResult->addValue( array( 'query', 'searchinfo' ),
                        'suggestion', $matches->getSuggestionQuery() );
        }

        // Add the search results to the result
        $terms = $wgContLang->convertForSearchResult( $matches->termMatches() );
        $titles = array();
        $count = 0;
        $result = $matches->next();

        while ( $result ) {
            if ( ++ $count > $limit ) {
                // We've reached the one extra which shows that there are additional items to be had. Stop here...
                $this->setContinueEnumParameter( 'offset', $params['offset'] + $params['limit'] );
                break;
            }

            // Silently skip broken and missing titles
            if ( $result->isBrokenTitle() || $result->isMissingRevision() ) {
                $result = $matches->next();
                continue;
            }

            $title = $result->getTitle();
            if ( is_null( $resultPageSet ) ) {
                $vals = array();
                ApiQueryBase::addTitleInfo( $vals, $title );

                if ( isset( $prop['snippet'] ) ) {
                    $vals['snippet'] = $result->getTextSnippet( $terms );
                }
                if ( isset( $prop['size'] ) ) {
                    $vals['size'] = $result->getByteSize();
                }
                if ( isset( $prop['wordcount'] ) ) {
                    $vals['wordcount'] = $result->getWordCount();
                }
                if ( isset( $prop['timestamp'] ) ) {
                    $vals['timestamp'] = wfTimestamp( TS_ISO_8601, $result->getTimestamp() );
                }
                if ( !is_null( $result->getScore() ) && isset( $prop['score'] ) ) {
                    $vals['score'] = $result->getScore();
                }
                if ( isset( $prop['titlesnippet'] ) ) {
                    $vals['titlesnippet'] = $result->getTitleSnippet( $terms );
                }
                if ( !is_null( $result->getRedirectTitle() ) ) {
                    if ( isset( $prop['redirecttitle'] ) ) {
                        $vals['redirecttitle'] = $result->getRedirectTitle();
                    }
                    if ( isset( $prop['redirectsnippet'] ) ) {
                        $vals['redirectsnippet'] = $result->getRedirectSnippet( $terms );
                    }
                }
                if ( !is_null( $result->getSectionTitle() ) ) {
                    if ( isset( $prop['sectiontitle'] ) ) {
                        $vals['sectiontitle'] = $result->getSectionTitle()->getFragment();
                    }
                    if ( isset( $prop['sectionsnippet'] ) ) {
                        $vals['sectionsnippet'] = $result->getSectionSnippet();
                    }
                }
                if ( isset( $prop['hasrelated'] ) && $result->hasRelated() ) {
                    $vals['hasrelated'] = '';
                }

                // Add item to results and see whether it fits
                $fit = $apiResult->addValue( array( 'query', $this->getModuleName() ),
                        null, $vals );
                if ( !$fit ) {
                    $this->setContinueEnumParameter( 'offset', $params['offset'] + $count - 1 );
                    break;
                }
            } else {
                $titles[] = $title;
            }

            $result = $matches->next();
        }

        if ( is_null( $resultPageSet ) ) {
            $apiResult->setIndexedTagName_internal( array(
                        'query', $this->getModuleName()
                    ), 'p' );
        } else {
            $resultPageSet->populateFromTitles( $titles );
        }
    }

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

    public function getAllowedParams() {
        global $wgSearchType;

        $params = array(
            'search' => array(
                ApiBase::PARAM_TYPE => 'string',
                ApiBase::PARAM_REQUIRED => true
            ),
            'namespace' => array(
                ApiBase::PARAM_DFLT => NS_MAIN,
                ApiBase::PARAM_TYPE => 'namespace',
                ApiBase::PARAM_ISMULTI => true,
            ),
            'what' => array(
                ApiBase::PARAM_DFLT => null,
                ApiBase::PARAM_TYPE => array(
                    'title',
                    'text',
                    'nearmatch',
                )
            ),
            'info' => array(
                ApiBase::PARAM_DFLT => 'totalhits|suggestion',
                ApiBase::PARAM_TYPE => array(
                    'totalhits',
                    'suggestion',
                ),
                ApiBase::PARAM_ISMULTI => true,
            ),
            'prop' => array(
                ApiBase::PARAM_DFLT => 'size|wordcount|timestamp|snippet',
                ApiBase::PARAM_TYPE => array(
                    'size',
                    'wordcount',
                    'timestamp',
                    'score',
                    'snippet',
                    'titlesnippet',
                    'redirecttitle',
                    'redirectsnippet',
                    'sectiontitle',
                    'sectionsnippet',
                    'hasrelated',
                ),
                ApiBase::PARAM_ISMULTI => true,
            ),
            'redirects' => false,
            'offset' => 0,
            'limit' => array(
                ApiBase::PARAM_DFLT => 10,
                ApiBase::PARAM_TYPE => 'limit',
                ApiBase::PARAM_MIN => 1,
                ApiBase::PARAM_MAX => ApiBase::LIMIT_SML1,
                ApiBase::PARAM_MAX2 => ApiBase::LIMIT_SML2
            )
        );

        $alternatives = SearchEngine::getSearchTypes();
        if ( count( $alternatives ) > 1 ) {
            if ( $alternatives[0] === null ) {
                $alternatives[0] = self::BACKEND_NULL_PARAM;
            }
            $params['backend'] = array(
                ApiBase::PARAM_DFLT => $wgSearchType,
                ApiBase::PARAM_TYPE => $alternatives,
            );
        }

        return $params;
    }

    public function getParamDescription() {
        $descriptions = array(
            'search' => 'Search for all page titles (or content) that has this value',
            'namespace' => 'The namespace(s) to enumerate',
            'what' => 'Search inside the text or titles',
            'info' => 'What metadata to return',
            'prop' => array(
                'What properties to return',
                ' size             - Adds the size of the page in bytes',
                ' wordcount        - Adds the word count of the page',
                ' timestamp        - Adds the timestamp of when the page was last edited',
                ' score            - Adds the score (if any) from the search engine',
                ' snippet          - Adds a parsed snippet of the page',
                ' titlesnippet     - Adds a parsed snippet of the page title',
                ' redirectsnippet  - Adds a parsed snippet of the redirect title',
                ' redirecttitle    - Adds the title of the matching redirect',
                ' sectionsnippet   - Adds a parsed snippet of the matching section title',
                ' sectiontitle     - Adds the title of the matching section',
                ' hasrelated       - Indicates whether a related search is available',
            ),
            'redirects' => 'Include redirect pages in the search',
            'offset' => 'Use this value to continue paging (return by query)',
            'limit' => 'How many total pages to return'
        );

        if ( count( SearchEngine::getSearchTypes() ) > 1 ) {
            $descriptions['backend'] = 'Which search backend to use, if not the default';
        }

        return $descriptions;
    }

    public function getResultProperties() {
        return array(
            '' => array(
                'ns' => 'namespace',
                'title' => 'string'
            ),
            'snippet' => array(
                'snippet' => 'string'
            ),
            'size' => array(
                'size' => 'integer'
            ),
            'wordcount' => array(
                'wordcount' => 'integer'
            ),
            'timestamp' => array(
                'timestamp' => 'timestamp'
            ),
            'score' => array(
                'score' => array(
                    ApiBase::PROP_TYPE => 'string',
                    ApiBase::PROP_NULLABLE => true
                )
            ),
            'titlesnippet' => array(
                'titlesnippet' => 'string'
            ),
            'redirecttitle' => array(
                'redirecttitle' => array(
                    ApiBase::PROP_TYPE => 'string',
                    ApiBase::PROP_NULLABLE => true
                )
            ),
            'redirectsnippet' => array(
                'redirectsnippet' => array(
                    ApiBase::PROP_TYPE => 'string',
                    ApiBase::PROP_NULLABLE => true
                )
            ),
            'sectiontitle' => array(
                'sectiontitle' => array(
                    ApiBase::PROP_TYPE => 'string',
                    ApiBase::PROP_NULLABLE => true
                )
            ),
            'sectionsnippet' => array(
                'sectionsnippet' => array(
                    ApiBase::PROP_TYPE => 'string',
                    ApiBase::PROP_NULLABLE => true
                )
            ),
            'hasrelated' => array(
                'hasrelated' => 'boolean'
            )
        );
    }

    public function getDescription() {
        return 'Perform a full text search';
    }

    public function getPossibleErrors() {
        return array_merge( parent::getPossibleErrors(), array(
            array( 'code' => 'search-text-disabled', 'info' => 'text search is disabled' ),
            array( 'code' => 'search-title-disabled', 'info' => 'title search is disabled' ),
            array( 'code' => 'search-error', 'info' => 'search error has occurred' ),
        ) );
    }

    public function getExamples() {
        return array(
            'api.php?action=query&list=search&srsearch=meaning',
            'api.php?action=query&list=search&srwhat=text&srsearch=meaning',
            'api.php?action=query&generator=search&gsrsearch=meaning&prop=info',
        );
    }

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