761 lines
21 KiB
PHP
761 lines
21 KiB
PHP
<?php
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/**
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*
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*
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* Created on Sep 7, 2006
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*
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* Copyright © 2006 Yuri Astrakhan "<Firstname><Lastname>@gmail.com"
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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* http://www.gnu.org/copyleft/gpl.html
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*
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* @file
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*/
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/**
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* This is a base class for all Query modules.
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* It provides some common functionality such as constructing various SQL
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* queries.
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*
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* @ingroup API
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*/
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abstract class ApiQueryBase extends ApiBase {
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private $mQueryModule, $mDb, $tables, $where, $fields, $options, $join_conds;
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/**
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* @param ApiQuery $queryModule
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* @param string $moduleName
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* @param string $paramPrefix
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*/
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public function __construct( ApiQuery $queryModule, $moduleName, $paramPrefix = '' ) {
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parent::__construct( $queryModule->getMain(), $moduleName, $paramPrefix );
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$this->mQueryModule = $queryModule;
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$this->mDb = null;
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$this->resetQueryParams();
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}
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/************************************************************************//**
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* @name Methods to implement
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* @{
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*/
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/**
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* Get the cache mode for the data generated by this module. Override
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* this in the module subclass. For possible return values and other
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* details about cache modes, see ApiMain::setCacheMode()
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*
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* Public caching will only be allowed if *all* the modules that supply
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* data for a given request return a cache mode of public.
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*
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* @param array $params
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* @return string
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*/
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public function getCacheMode( $params ) {
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return 'private';
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}
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/**
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* Override this method to request extra fields from the pageSet
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* using $pageSet->requestField('fieldName')
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*
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* Note this only makes sense for 'prop' modules, as 'list' and 'meta'
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* modules should not be using the pageset.
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*
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* @param ApiPageSet $pageSet
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*/
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public function requestExtraData( $pageSet ) {
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}
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/**@}*/
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/************************************************************************//**
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* @name Data access
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* @{
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*/
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/**
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* Get the main Query module
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* @return ApiQuery
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*/
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public function getQuery() {
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return $this->mQueryModule;
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}
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/**
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* @see ApiBase::getParent()
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*/
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public function getParent() {
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return $this->getQuery();
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}
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/**
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* Get the Query database connection (read-only)
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* @return DatabaseBase
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*/
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protected function getDB() {
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if ( is_null( $this->mDb ) ) {
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$this->mDb = $this->getQuery()->getDB();
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}
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return $this->mDb;
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}
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/**
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* Selects the query database connection with the given name.
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* See ApiQuery::getNamedDB() for more information
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* @param string $name Name to assign to the database connection
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* @param int $db One of the DB_* constants
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* @param array $groups Query groups
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* @return DatabaseBase
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*/
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public function selectNamedDB( $name, $db, $groups ) {
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$this->mDb = $this->getQuery()->getNamedDB( $name, $db, $groups );
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return $this->mDb;
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}
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/**
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* Get the PageSet object to work on
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* @return ApiPageSet
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*/
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protected function getPageSet() {
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return $this->getQuery()->getPageSet();
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}
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/**@}*/
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/************************************************************************//**
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* @name Querying
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* @{
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*/
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/**
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* Blank the internal arrays with query parameters
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*/
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protected function resetQueryParams() {
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$this->tables = array();
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$this->where = array();
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$this->fields = array();
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$this->options = array();
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$this->join_conds = array();
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}
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/**
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* Add a set of tables to the internal array
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* @param string|string[] $tables Table name or array of table names
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* @param string|null $alias Table alias, or null for no alias. Cannot be
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* used with multiple tables
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*/
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protected function addTables( $tables, $alias = null ) {
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if ( is_array( $tables ) ) {
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if ( !is_null( $alias ) ) {
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ApiBase::dieDebug( __METHOD__, 'Multiple table aliases not supported' );
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}
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$this->tables = array_merge( $this->tables, $tables );
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} else {
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if ( !is_null( $alias ) ) {
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$this->tables[$alias] = $tables;
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} else {
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$this->tables[] = $tables;
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}
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}
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}
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/**
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* Add a set of JOIN conditions to the internal array
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*
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* JOIN conditions are formatted as array( tablename => array(jointype,
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* conditions) e.g. array('page' => array('LEFT JOIN',
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* 'page_id=rev_page')) . conditions may be a string or an
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* addWhere()-style array
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* @param array $join_conds JOIN conditions
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*/
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protected function addJoinConds( $join_conds ) {
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if ( !is_array( $join_conds ) ) {
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ApiBase::dieDebug( __METHOD__, 'Join conditions have to be arrays' );
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}
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$this->join_conds = array_merge( $this->join_conds, $join_conds );
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}
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/**
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* Add a set of fields to select to the internal array
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* @param array|string $value Field name or array of field names
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*/
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protected function addFields( $value ) {
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if ( is_array( $value ) ) {
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$this->fields = array_merge( $this->fields, $value );
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} else {
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$this->fields[] = $value;
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}
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}
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/**
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* Same as addFields(), but add the fields only if a condition is met
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* @param array|string $value See addFields()
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* @param bool $condition If false, do nothing
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* @return bool $condition
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*/
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protected function addFieldsIf( $value, $condition ) {
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if ( $condition ) {
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$this->addFields( $value );
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return true;
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}
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return false;
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}
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/**
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* Add a set of WHERE clauses to the internal array.
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* Clauses can be formatted as 'foo=bar' or array('foo' => 'bar'),
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* the latter only works if the value is a constant (i.e. not another field)
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*
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* If $value is an empty array, this function does nothing.
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*
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* For example, array('foo=bar', 'baz' => 3, 'bla' => 'foo') translates
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* to "foo=bar AND baz='3' AND bla='foo'"
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* @param string|array $value
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*/
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protected function addWhere( $value ) {
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if ( is_array( $value ) ) {
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// Sanity check: don't insert empty arrays,
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// Database::makeList() chokes on them
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if ( count( $value ) ) {
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$this->where = array_merge( $this->where, $value );
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}
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} else {
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$this->where[] = $value;
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}
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}
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/**
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* Same as addWhere(), but add the WHERE clauses only if a condition is met
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* @param string|array $value
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* @param bool $condition If false, do nothing
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* @return bool $condition
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*/
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protected function addWhereIf( $value, $condition ) {
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if ( $condition ) {
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$this->addWhere( $value );
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return true;
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}
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return false;
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}
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/**
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* Equivalent to addWhere(array($field => $value))
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* @param string $field Field name
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* @param string $value Value; ignored if null or empty array;
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*/
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protected function addWhereFld( $field, $value ) {
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// Use count() to its full documented capabilities to simultaneously
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// test for null, empty array or empty countable object
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if ( count( $value ) ) {
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$this->where[$field] = $value;
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}
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}
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/**
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* Add a WHERE clause corresponding to a range, and an ORDER BY
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* clause to sort in the right direction
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* @param string $field Field name
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* @param string $dir If 'newer', sort in ascending order, otherwise
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* sort in descending order
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* @param string $start Value to start the list at. If $dir == 'newer'
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* this is the lower boundary, otherwise it's the upper boundary
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* @param string $end Value to end the list at. If $dir == 'newer' this
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* is the upper boundary, otherwise it's the lower boundary
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* @param bool $sort If false, don't add an ORDER BY clause
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*/
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protected function addWhereRange( $field, $dir, $start, $end, $sort = true ) {
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$isDirNewer = ( $dir === 'newer' );
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$after = ( $isDirNewer ? '>=' : '<=' );
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$before = ( $isDirNewer ? '<=' : '>=' );
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$db = $this->getDB();
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if ( !is_null( $start ) ) {
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$this->addWhere( $field . $after . $db->addQuotes( $start ) );
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}
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if ( !is_null( $end ) ) {
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$this->addWhere( $field . $before . $db->addQuotes( $end ) );
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}
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if ( $sort ) {
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$order = $field . ( $isDirNewer ? '' : ' DESC' );
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// Append ORDER BY
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$optionOrderBy = isset( $this->options['ORDER BY'] )
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? (array)$this->options['ORDER BY']
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: array();
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$optionOrderBy[] = $order;
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$this->addOption( 'ORDER BY', $optionOrderBy );
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}
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}
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/**
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* Add a WHERE clause corresponding to a range, similar to addWhereRange,
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* but converts $start and $end to database timestamps.
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* @see addWhereRange
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* @param string $field
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* @param string $dir
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* @param string $start
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* @param string $end
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* @param bool $sort
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*/
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protected function addTimestampWhereRange( $field, $dir, $start, $end, $sort = true ) {
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$db = $this->getDb();
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$this->addWhereRange( $field, $dir,
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$db->timestampOrNull( $start ), $db->timestampOrNull( $end ), $sort );
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}
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/**
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* Add an option such as LIMIT or USE INDEX. If an option was set
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* before, the old value will be overwritten
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* @param string $name Option name
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* @param string $value Option value
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*/
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protected function addOption( $name, $value = null ) {
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if ( is_null( $value ) ) {
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$this->options[] = $name;
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} else {
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$this->options[$name] = $value;
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}
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}
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/**
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* Execute a SELECT query based on the values in the internal arrays
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* @param string $method Function the query should be attributed to.
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* You should usually use __METHOD__ here
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* @param array $extraQuery Query data to add but not store in the object
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* Format is array(
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* 'tables' => ...,
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* 'fields' => ...,
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* 'where' => ...,
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* 'options' => ...,
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* 'join_conds' => ...
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* )
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* @return ResultWrapper
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*/
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protected function select( $method, $extraQuery = array() ) {
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$tables = array_merge(
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$this->tables,
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isset( $extraQuery['tables'] ) ? (array)$extraQuery['tables'] : array()
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);
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$fields = array_merge(
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$this->fields,
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isset( $extraQuery['fields'] ) ? (array)$extraQuery['fields'] : array()
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);
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$where = array_merge(
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$this->where,
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isset( $extraQuery['where'] ) ? (array)$extraQuery['where'] : array()
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);
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$options = array_merge(
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$this->options,
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isset( $extraQuery['options'] ) ? (array)$extraQuery['options'] : array()
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);
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$join_conds = array_merge(
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$this->join_conds,
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isset( $extraQuery['join_conds'] ) ? (array)$extraQuery['join_conds'] : array()
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);
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$res = $this->getDB()->select( $tables, $fields, $where, $method, $options, $join_conds );
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return $res;
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}
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/**
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* @param string $query
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* @param string $protocol
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* @return null|string
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*/
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public function prepareUrlQuerySearchString( $query = null, $protocol = null ) {
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$db = $this->getDb();
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if ( !is_null( $query ) || $query != '' ) {
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if ( is_null( $protocol ) ) {
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$protocol = 'http://';
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}
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$likeQuery = LinkFilter::makeLikeArray( $query, $protocol );
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if ( !$likeQuery ) {
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$this->dieUsage( 'Invalid query', 'bad_query' );
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}
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$likeQuery = LinkFilter::keepOneWildcard( $likeQuery );
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return 'el_index ' . $db->buildLike( $likeQuery );
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} elseif ( !is_null( $protocol ) ) {
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return 'el_index ' . $db->buildLike( "$protocol", $db->anyString() );
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}
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return null;
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}
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/**
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* Filters hidden users (where the user doesn't have the right to view them)
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* Also adds relevant block information
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*
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* @param bool $showBlockInfo
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* @return void
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*/
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public function showHiddenUsersAddBlockInfo( $showBlockInfo ) {
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$this->addTables( 'ipblocks' );
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$this->addJoinConds( array(
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'ipblocks' => array( 'LEFT JOIN', 'ipb_user=user_id' ),
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) );
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$this->addFields( 'ipb_deleted' );
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if ( $showBlockInfo ) {
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$this->addFields( array(
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'ipb_id',
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'ipb_by',
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'ipb_by_text',
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'ipb_reason',
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'ipb_expiry',
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'ipb_timestamp'
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) );
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}
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// Don't show hidden names
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if ( !$this->getUser()->isAllowed( 'hideuser' ) ) {
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$this->addWhere( 'ipb_deleted = 0 OR ipb_deleted IS NULL' );
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}
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}
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/**@}*/
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/************************************************************************//**
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* @name Utility methods
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* @{
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*/
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/**
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* Add information (title and namespace) about a Title object to a
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* result array
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* @param array $arr Result array à la ApiResult
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* @param Title $title
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* @param string $prefix Module prefix
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*/
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public static function addTitleInfo( &$arr, $title, $prefix = '' ) {
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$arr[$prefix . 'ns'] = intval( $title->getNamespace() );
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$arr[$prefix . 'title'] = $title->getPrefixedText();
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}
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/**
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* Add a sub-element under the page element with the given page ID
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* @param int $pageId Page ID
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* @param array $data Data array à la ApiResult
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* @return bool Whether the element fit in the result
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*/
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protected function addPageSubItems( $pageId, $data ) {
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$result = $this->getResult();
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ApiResult::setIndexedTagName( $data, $this->getModulePrefix() );
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return $result->addValue( array( 'query', 'pages', intval( $pageId ) ),
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$this->getModuleName(),
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$data );
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}
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/**
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* Same as addPageSubItems(), but one element of $data at a time
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* @param int $pageId Page ID
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* @param array $item Data array à la ApiResult
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* @param string $elemname XML element name. If null, getModuleName()
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* is used
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* @return bool Whether the element fit in the result
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*/
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protected function addPageSubItem( $pageId, $item, $elemname = null ) {
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if ( is_null( $elemname ) ) {
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$elemname = $this->getModulePrefix();
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}
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$result = $this->getResult();
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$fit = $result->addValue( array( 'query', 'pages', $pageId,
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$this->getModuleName() ), null, $item );
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if ( !$fit ) {
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return false;
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}
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$result->addIndexedTagName( array( 'query', 'pages', $pageId,
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$this->getModuleName() ), $elemname );
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return true;
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}
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/**
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* Set a query-continue value
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* @param string $paramName Parameter name
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* @param string|array $paramValue Parameter value
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*/
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protected function setContinueEnumParameter( $paramName, $paramValue ) {
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$this->getContinuationManager()->addContinueParam( $this, $paramName, $paramValue );
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}
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/**
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* Convert an input title or title prefix into a dbkey.
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*
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* $namespace should always be specified in order to handle per-namespace
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* capitalization settings.
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*
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* @param string $titlePart Title part
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* @param int $namespace Namespace of the title
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* @return string DBkey (no namespace prefix)
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*/
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public function titlePartToKey( $titlePart, $namespace = NS_MAIN ) {
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$t = Title::makeTitleSafe( $namespace, $titlePart . 'x' );
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if ( !$t || $t->hasFragment() ) {
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// Invalid title (e.g. bad chars) or contained a '#'.
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$this->dieUsageMsg( array( 'invalidtitle', $titlePart ) );
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}
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if ( $namespace != $t->getNamespace() || $t->isExternal() ) {
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// This can happen in two cases. First, if you call titlePartToKey with a title part
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// that looks like a namespace, but with $defaultNamespace = NS_MAIN. It would be very
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// difficult to handle such a case. Such cases cannot exist and are therefore treated
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// as invalid user input. The second case is when somebody specifies a title interwiki
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// prefix.
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$this->dieUsageMsg( array( 'invalidtitle', $titlePart ) );
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}
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return substr( $t->getDbKey(), 0, -1 );
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}
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/**
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* Convert an input title or title prefix into a namespace constant and dbkey.
|
|
*
|
|
* @since 1.26
|
|
* @param string $titlePart Title part
|
|
* @param int $defaultNamespace Default namespace if none is given
|
|
* @return array (int, string) Namespace number and DBkey
|
|
*/
|
|
public function prefixedTitlePartToKey( $titlePart, $defaultNamespace = NS_MAIN ) {
|
|
$t = Title::newFromText( $titlePart . 'x', $defaultNamespace );
|
|
if ( !$t || $t->hasFragment() || $t->isExternal() ) {
|
|
// Invalid title (e.g. bad chars) or contained a '#'.
|
|
$this->dieUsageMsg( array( 'invalidtitle', $titlePart ) );
|
|
}
|
|
|
|
return array( $t->getNamespace(), substr( $t->getDbKey(), 0, -1 ) );
|
|
}
|
|
|
|
/**
|
|
* Gets the personalised direction parameter description
|
|
*
|
|
* @param string $p ModulePrefix
|
|
* @param string $extraDirText Any extra text to be appended on the description
|
|
* @return array
|
|
*/
|
|
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.",
|
|
);
|
|
}
|
|
|
|
/**
|
|
* @param string $hash
|
|
* @return bool
|
|
*/
|
|
public function validateSha1Hash( $hash ) {
|
|
return preg_match( '/^[a-f0-9]{40}$/', $hash );
|
|
}
|
|
|
|
/**
|
|
* @param string $hash
|
|
* @return bool
|
|
*/
|
|
public function validateSha1Base36Hash( $hash ) {
|
|
return preg_match( '/^[a-z0-9]{31}$/', $hash );
|
|
}
|
|
|
|
/**
|
|
* Check whether the current user has permission to view revision-deleted
|
|
* fields.
|
|
* @return bool
|
|
*/
|
|
public function userCanSeeRevDel() {
|
|
return $this->getUser()->isAllowedAny(
|
|
'deletedhistory',
|
|
'deletedtext',
|
|
'suppressrevision',
|
|
'viewsuppressed'
|
|
);
|
|
}
|
|
|
|
/**@}*/
|
|
|
|
/************************************************************************//**
|
|
* @name Deprecated
|
|
* @{
|
|
*/
|
|
|
|
/**
|
|
* Estimate the row count for the SELECT query that would be run if we
|
|
* called select() right now, and check if it's acceptable.
|
|
* @deprecated since 1.24
|
|
* @return bool True if acceptable, false otherwise
|
|
*/
|
|
protected function checkRowCount() {
|
|
wfDeprecated( __METHOD__, '1.24' );
|
|
$db = $this->getDB();
|
|
$rowcount = $db->estimateRowCount(
|
|
$this->tables,
|
|
$this->fields,
|
|
$this->where,
|
|
__METHOD__,
|
|
$this->options
|
|
);
|
|
|
|
if ( $rowcount > $this->getConfig()->get( 'APIMaxDBRows' ) ) {
|
|
return false;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* Convert a title to a DB key
|
|
* @deprecated since 1.24, past uses of this were always incorrect and should
|
|
* have used self::titlePartToKey() instead
|
|
* @param string $title Page title with spaces
|
|
* @return string Page title with underscores
|
|
*/
|
|
public function titleToKey( $title ) {
|
|
wfDeprecated( __METHOD__, '1.24' );
|
|
// 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();
|
|
}
|
|
|
|
/**
|
|
* The inverse of titleToKey()
|
|
* @deprecated since 1.24, unused and probably never needed
|
|
* @param string $key Page title with underscores
|
|
* @return string Page title with spaces
|
|
*/
|
|
public function keyToTitle( $key ) {
|
|
wfDeprecated( __METHOD__, '1.24' );
|
|
// 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();
|
|
}
|
|
|
|
/**
|
|
* Inverse of titlePartToKey()
|
|
* @deprecated since 1.24, unused and probably never needed
|
|
* @param string $keyPart DBkey, with prefix
|
|
* @return string Key part with underscores
|
|
*/
|
|
public function keyPartToTitle( $keyPart ) {
|
|
wfDeprecated( __METHOD__, '1.24' );
|
|
return substr( $this->keyToTitle( $keyPart . 'x' ), 0, -1 );
|
|
}
|
|
|
|
/**@}*/
|
|
}
|
|
|
|
/**
|
|
* @ingroup API
|
|
*/
|
|
abstract class ApiQueryGeneratorBase extends ApiQueryBase {
|
|
|
|
private $mGeneratorPageSet = null;
|
|
|
|
/**
|
|
* Switch this module to generator mode. By default, generator mode is
|
|
* switched off and the module acts like a normal query module.
|
|
* @since 1.21 requires pageset parameter
|
|
* @param ApiPageSet $generatorPageSet ApiPageSet object that the module will get
|
|
* by calling getPageSet() when in generator mode.
|
|
*/
|
|
public function setGeneratorMode( ApiPageSet $generatorPageSet ) {
|
|
if ( $generatorPageSet === null ) {
|
|
ApiBase::dieDebug( __METHOD__, 'Required parameter missing - $generatorPageSet' );
|
|
}
|
|
$this->mGeneratorPageSet = $generatorPageSet;
|
|
}
|
|
|
|
/**
|
|
* Get the PageSet object to work on.
|
|
* If this module is generator, the pageSet object is different from other module's
|
|
* @return ApiPageSet
|
|
*/
|
|
protected function getPageSet() {
|
|
if ( $this->mGeneratorPageSet !== null ) {
|
|
return $this->mGeneratorPageSet;
|
|
}
|
|
|
|
return parent::getPageSet();
|
|
}
|
|
|
|
/**
|
|
* Overrides ApiBase to prepend 'g' to every generator parameter
|
|
* @param string $paramName Parameter name
|
|
* @return string Prefixed parameter name
|
|
*/
|
|
public function encodeParamName( $paramName ) {
|
|
if ( $this->mGeneratorPageSet !== null ) {
|
|
return 'g' . parent::encodeParamName( $paramName );
|
|
} else {
|
|
return parent::encodeParamName( $paramName );
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Overridden to set the generator param if in generator mode
|
|
* @param string $paramName Parameter name
|
|
* @param string|array $paramValue Parameter value
|
|
*/
|
|
protected function setContinueEnumParameter( $paramName, $paramValue ) {
|
|
if ( $this->mGeneratorPageSet !== null ) {
|
|
$this->getContinuationManager()->addGeneratorContinueParam( $this, $paramName, $paramValue );
|
|
} else {
|
|
parent::setContinueEnumParameter( $paramName, $paramValue );
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @see ApiBase::getHelpFlags()
|
|
*
|
|
* Corresponding messages: api-help-flag-generator
|
|
*/
|
|
protected function getHelpFlags() {
|
|
$flags = parent::getHelpFlags();
|
|
$flags[] = 'generator';
|
|
return $flags;
|
|
}
|
|
|
|
/**
|
|
* Execute this module as a generator
|
|
* @param ApiPageSet $resultPageSet All output should be appended to this object
|
|
*/
|
|
abstract public function executeGenerator( $resultPageSet );
|
|
}
|