ApiQueryBase.php

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<?php
abstract class ApiQueryBase extends ApiBase {

        private $mQueryModule, $mDb, $tables, $where, $fields, $options, $join_conds;

        public function __construct( ApiBase $query, $moduleName, $paramPrefix = '' ) {
                parent::__construct( $query->getMain(), $moduleName, $paramPrefix );
                $this->mQueryModule = $query;
                $this->mDb = null;
                $this->resetQueryParams();
        }

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

        protected function resetQueryParams() {
                $this->tables = array();
                $this->where = array();
                $this->fields = array();
                $this->options = array();
                $this->join_conds = array();
        }

        protected function addTables( $tables, $alias = null ) {
                if ( is_array( $tables ) ) {
                        if ( !is_null( $alias ) ) {
                                ApiBase::dieDebug( __METHOD__, 'Multiple table aliases not supported' );
                        }
                        $this->tables = array_merge( $this->tables, $tables );
                } else {
                        if ( !is_null( $alias ) ) {
                                $this->tables[$alias] = $tables;
                        } else {
                                $this->tables[] = $tables;
                        }
                }
        }

        protected function addJoinConds( $join_conds ) {
                if ( !is_array( $join_conds ) ) {
                        ApiBase::dieDebug( __METHOD__, 'Join conditions have to be arrays' );
                }
                $this->join_conds = array_merge( $this->join_conds, $join_conds );
        }

        protected function addFields( $value ) {
                if ( is_array( $value ) ) {
                        $this->fields = array_merge( $this->fields, $value );
                } else {
                        $this->fields[] = $value;
                }
        }

        protected function addFieldsIf( $value, $condition ) {
                if ( $condition ) {
                        $this->addFields( $value );
                        return true;
                }
                return false;
        }

        protected function addWhere( $value ) {
                if ( is_array( $value ) ) {
                        // Sanity check: don't insert empty arrays,
                        // Database::makeList() chokes on them
                        if ( count( $value ) ) {
                                $this->where = array_merge( $this->where, $value );
                        }
                } else {
                        $this->where[] = $value;
                }
        }

        protected function addWhereIf( $value, $condition ) {
                if ( $condition ) {
                        $this->addWhere( $value );
                        return true;
                }
                return false;
        }

        protected function addWhereFld( $field, $value ) {
                // Use count() to its full documented capabilities to simultaneously
                // test for null, empty array or empty countable object
                if ( count( $value ) ) {
                        $this->where[$field] = $value;
                }
        }

        protected function addWhereRange( $field, $dir, $start, $end, $sort = true ) {
                $isDirNewer = ( $dir === 'newer' );
                $after = ( $isDirNewer ? '>=' : '<=' );
                $before = ( $isDirNewer ? '<=' : '>=' );
                $db = $this->getDB();

                if ( !is_null( $start ) ) {
                        $this->addWhere( $field . $after . $db->addQuotes( $start ) );
                }

                if ( !is_null( $end ) ) {
                        $this->addWhere( $field . $before . $db->addQuotes( $end ) );
                }

                if ( $sort ) {
                        $order = $field . ( $isDirNewer ? '' : ' DESC' );
                        // Append ORDER BY
                        $optionOrderBy = isset( $this->options['ORDER BY'] ) ? (array)$this->options['ORDER BY'] : array();
                        $optionOrderBy[] = $order;
                        $this->addOption( 'ORDER BY', $optionOrderBy );
                }
        }

        protected function addTimestampWhereRange( $field, $dir, $start, $end, $sort = true ) {
                $db = $this->getDb();
                return $this->addWhereRange( $field, $dir,
                        $db->timestampOrNull( $start ), $db->timestampOrNull( $end ), $sort );
        }

        protected function addOption( $name, $value = null ) {
                if ( is_null( $value ) ) {
                        $this->options[] = $name;
                } else {
                        $this->options[$name] = $value;
                }
        }

        protected function select( $method, $extraQuery = array() ) {

                $tables = array_merge( $this->tables, isset( $extraQuery['tables'] ) ? (array)$extraQuery['tables'] : array() );
                $fields = array_merge( $this->fields, isset( $extraQuery['fields'] ) ? (array)$extraQuery['fields'] : array() );
                $where = array_merge( $this->where, isset( $extraQuery['where'] ) ? (array)$extraQuery['where'] : array() );
                $options = array_merge( $this->options, isset( $extraQuery['options'] ) ? (array)$extraQuery['options'] : array() );
                $join_conds = array_merge( $this->join_conds, isset( $extraQuery['join_conds'] ) ? (array)$extraQuery['join_conds'] : array() );

                // getDB has its own profileDBIn/Out calls
                $db = $this->getDB();

                $this->profileDBIn();
                $res = $db->select( $tables, $fields, $where, $method, $options, $join_conds );
                $this->profileDBOut();

                return $res;
        }

        protected function checkRowCount() {
                $db = $this->getDB();
                $this->profileDBIn();
                $rowcount = $db->estimateRowCount( $this->tables, $this->fields, $this->where, __METHOD__, $this->options );
                $this->profileDBOut();

                global $wgAPIMaxDBRows;
                if ( $rowcount > $wgAPIMaxDBRows ) {
                        return false;
                }
                return true;
        }

        public static function addTitleInfo( &$arr, $title, $prefix = '' ) {
                $arr[$prefix . 'ns'] = intval( $title->getNamespace() );
                $arr[$prefix . 'title'] = $title->getPrefixedText();
        }

        public function requestExtraData( $pageSet ) {
        }

        public function getQuery() {
                return $this->mQueryModule;
        }

        protected function addPageSubItems( $pageId, $data ) {
                $result = $this->getResult();
                $result->setIndexedTagName( $data, $this->getModulePrefix() );
                return $result->addValue( array( 'query', 'pages', intval( $pageId ) ),
                        $this->getModuleName(),
                        $data );
        }

        protected function addPageSubItem( $pageId, $item, $elemname = null ) {
                if ( is_null( $elemname ) ) {
                        $elemname = $this->getModulePrefix();
                }
                $result = $this->getResult();
                $fit = $result->addValue( array( 'query', 'pages', $pageId,
                                         $this->getModuleName() ), null, $item );
                if ( !$fit ) {
                        return false;
                }
                $result->setIndexedTagName_internal( array( 'query', 'pages', $pageId,
                                $this->getModuleName() ), $elemname );
                return true;
        }

        protected function setContinueEnumParameter( $paramName, $paramValue ) {
                $paramName = $this->encodeParamName( $paramName );
                $msg = array( $paramName => $paramValue );
                $result = $this->getResult();
                $result->disableSizeCheck();
                $result->addValue( 'query-continue', $this->getModuleName(), $msg );
                $result->enableSizeCheck();
        }

        protected function getDB() {
                if ( is_null( $this->mDb ) ) {
                        $apiQuery = $this->getQuery();
                        $this->mDb = $apiQuery->getDB();
                }
                return $this->mDb;
        }

        public function selectNamedDB( $name, $db, $groups ) {
                $this->mDb = $this->getQuery()->getNamedDB( $name, $db, $groups );
        }

        protected function getPageSet() {
                return $this->getQuery()->getPageSet();
        }

        public function titleToKey( $title ) {
                // Don't throw an error if we got an empty string
                if ( trim( $title ) == '' ) {
                        return '';
                }
                $t = Title::newFromText( $title );
                if ( !$t ) {
                        $this->dieUsageMsg( array( 'invalidtitle', $title ) );
                }
                return $t->getPrefixedDbKey();
        }

        public function keyToTitle( $key ) {
                // Don't throw an error if we got an empty string
                if ( trim( $key ) == '' ) {
                        return '';
                }
                $t = Title::newFromDbKey( $key );
                // This really shouldn't happen but we gotta check anyway
                if ( !$t ) {
                        $this->dieUsageMsg( array( 'invalidtitle', $key ) );
                }
                return $t->getPrefixedText();
        }

        public function titlePartToKey( $titlePart ) {
                return substr( $this->titleToKey( $titlePart . 'x' ), 0, - 1 );
        }

        public function keyPartToTitle( $keyPart ) {
                return substr( $this->keyToTitle( $keyPart . 'x' ), 0, - 1 );
        }

        public function getDirectionDescription( $p = '', $extraDirText = '' ) {
                return array(
                                "In which direction to enumerate{$extraDirText}",
                                " newer          - List oldest first. Note: {$p}start has to be before {$p}end.",
                                " older          - List newest first (default). Note: {$p}start has to be later than {$p}end.",
                        );
        }

        public function prepareUrlQuerySearchString( $query = null, $protocol = null) {
                $db = $this->getDb();
                if ( !is_null( $query ) || $query != '' ) {
                        if ( is_null( $protocol ) ) {
                                $protocol = 'http://';
                        }

                        $likeQuery = LinkFilter::makeLikeArray( $query, $protocol );
                        if ( !$likeQuery ) {
                                $this->dieUsage( 'Invalid query', 'bad_query' );
                        }

                        $likeQuery = LinkFilter::keepOneWildcard( $likeQuery );
                        return 'el_index ' . $db->buildLike( $likeQuery );
                } elseif ( !is_null( $protocol ) ) {
                        return 'el_index ' . $db->buildLike( "$protocol", $db->anyString() );
                }

                return null;
        }

        public function showHiddenUsersAddBlockInfo( $showBlockInfo ) {
                $userCanViewHiddenUsers = $this->getUser()->isAllowed( 'hideuser' );

                if ( $showBlockInfo || !$userCanViewHiddenUsers ) {
                        $this->addTables( 'ipblocks' );
                        $this->addJoinConds( array(
                                'ipblocks' => array( 'LEFT JOIN', 'ipb_user=user_id' ),
                        ) );

                        $this->addFields( 'ipb_deleted' );

                        if ( $showBlockInfo ) {
                                $this->addFields( array( 'ipb_reason', 'ipb_by_text', 'ipb_expiry' ) );
                        }

                        // Don't show hidden names
                        if ( !$userCanViewHiddenUsers ) {
                                $this->addWhere( 'ipb_deleted = 0 OR ipb_deleted IS NULL' );
                        }
                }
        }

        public function validateSha1Hash( $hash ) {
                return preg_match( '/[a-fA-F0-9]{40}/', $hash );
        }

        public function validateSha1Base36Hash( $hash ) {
                return preg_match( '/[a-zA-Z0-9]{31}/', $hash );
        }

        public function getPossibleErrors() {
                return array_merge( parent::getPossibleErrors(), array(
                        array( 'invalidtitle', 'title' ),
                        array( 'invalidtitle', 'key' ),
                ) );
        }

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

abstract class ApiQueryGeneratorBase extends ApiQueryBase {

        private $mIsGenerator;

        public function __construct( $query, $moduleName, $paramPrefix = '' ) {
                parent::__construct( $query, $moduleName, $paramPrefix );
                $this->mIsGenerator = false;
        }

        public function setGeneratorMode() {
                $this->mIsGenerator = true;
        }

        public function encodeParamName( $paramName ) {
                if ( $this->mIsGenerator ) {
                        return 'g' . parent::encodeParamName( $paramName );
                } else {
                        return parent::encodeParamName( $paramName );
                }
        }

        public abstract function executeGenerator( $resultPageSet );
}