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<?php
/**
* Copyright © 2006 Yuri Astrakhan "<Firstname><Lastname>@gmail.com"
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
* http://www.gnu.org/copyleft/gpl.html
*
* @file
*/
use Wikimedia\Rdbms\IDatabase;
use Wikimedia\Rdbms\ResultWrapper;
/**
* This is a base class for all Query modules.
* It provides some common functionality such as constructing various SQL
* queries.
*
* @ingroup API
*/
abstract class ApiQueryBase extends ApiBase {
private $mQueryModule, $mDb, $tables, $where, $fields, $options, $join_conds;
/**
* @param ApiQuery $queryModule
* @param string $moduleName
* @param string $paramPrefix
*/
public function __construct( ApiQuery $queryModule, $moduleName, $paramPrefix = '' ) {
parent::__construct( $queryModule->getMain(), $moduleName, $paramPrefix );
$this->mQueryModule = $queryModule;
$this->mDb = null;
$this->resetQueryParams();
}
/************************************************************************//**
* @name Methods to implement
* @{
*/
/**
* Get the cache mode for the data generated by this module. Override
* this in the module subclass. For possible return values and other
* details about cache modes, see ApiMain::setCacheMode()
*
* Public caching will only be allowed if *all* the modules that supply
* data for a given request return a cache mode of public.
*
* @param array $params
* @return string
*/
public function getCacheMode( $params ) {
return 'private';
}
/**
* Override this method to request extra fields from the pageSet
* using $pageSet->requestField('fieldName')
*
* Note this only makes sense for 'prop' modules, as 'list' and 'meta'
* modules should not be using the pageset.
*
* @param ApiPageSet $pageSet
*/
public function requestExtraData( $pageSet ) {
}
/**@}*/
/************************************************************************//**
* @name Data access
* @{
*/
/**
* Get the main Query module
* @return ApiQuery
*/
public function getQuery() {
return $this->mQueryModule;
}
/** @inheritDoc */
public function getParent() {
return $this->getQuery();
}
/**
* Get the Query database connection (read-only)
* @return IDatabase
*/
protected function getDB() {
if ( is_null( $this->mDb ) ) {
$this->mDb = $this->getQuery()->getDB();
}
return $this->mDb;
}
/**
* Selects the query database connection with the given name.
* See ApiQuery::getNamedDB() for more information
* @param string $name Name to assign to the database connection
* @param int $db One of the DB_* constants
* @param string|string[] $groups Query groups
* @return IDatabase
*/
public function selectNamedDB( $name, $db, $groups ) {
$this->mDb = $this->getQuery()->getNamedDB( $name, $db, $groups );
return $this->mDb;
}
/**
* Get the PageSet object to work on
* @return ApiPageSet
*/
protected function getPageSet() {
return $this->getQuery()->getPageSet();
}
/**@}*/
/************************************************************************//**
* @name Querying
* @{
*/
/**
* Blank the internal arrays with query parameters
*/
protected function resetQueryParams() {
$this->tables = [];
$this->where = [];
$this->fields = [];
$this->options = [];
$this->join_conds = [];
}
/**
* Add a set of tables to the internal array
* @param string|string[] $tables Table name or array of table names
* @param string|null $alias Table alias, or null for no alias. Cannot be
* used with multiple tables
*/
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;
}
}
}
/**
* Add a set of JOIN conditions to the internal array
*
* JOIN conditions are formatted as [ tablename => [ jointype, conditions ] ]
* e.g. [ 'page' => [ 'LEFT JOIN', 'page_id=rev_page' ] ].
* Conditions may be a string or an addWhere()-style array.
* @param array $join_conds JOIN conditions
*/
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 );
}
/**
* Add a set of fields to select to the internal array
* @param array|string $value Field name or array of field names
*/
protected function addFields( $value ) {
if ( is_array( $value ) ) {
$this->fields = array_merge( $this->fields, $value );
} else {
$this->fields[] = $value;
}
}
/**
* Same as addFields(), but add the fields only if a condition is met
* @param array|string $value See addFields()
* @param bool $condition If false, do nothing
* @return bool $condition
*/
protected function addFieldsIf( $value, $condition ) {
if ( $condition ) {
$this->addFields( $value );
return true;
}
return false;
}
/**
* Add a set of WHERE clauses to the internal array.
* Clauses can be formatted as 'foo=bar' or [ 'foo' => 'bar' ],
* the latter only works if the value is a constant (i.e. not another field)
*
* If $value is an empty array, this function does nothing.
*
* For example, [ 'foo=bar', 'baz' => 3, 'bla' => 'foo' ] translates
* to "foo=bar AND baz='3' AND bla='foo'"
* @param string|array $value
*/
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;
}
}
/**
* Same as addWhere(), but add the WHERE clauses only if a condition is met
* @param string|array $value
* @param bool $condition If false, do nothing
* @return bool $condition
*/
protected function addWhereIf( $value, $condition ) {
if ( $condition ) {
$this->addWhere( $value );
return true;
}
return false;
}
/**
* Equivalent to addWhere(array($field => $value))
* @param string $field Field name
* @param string|string[] $value Value; ignored if null or empty array
*/
protected function addWhereFld( $field, $value ) {
if ( $value !== null && !( is_array( $value ) && !$value ) ) {
$this->where[$field] = $value;
}
}
/**
* Add a WHERE clause corresponding to a range, and an ORDER BY
* clause to sort in the right direction
* @param string $field Field name
* @param string $dir If 'newer', sort in ascending order, otherwise
* sort in descending order
* @param string $start Value to start the list at. If $dir == 'newer'
* this is the lower boundary, otherwise it's the upper boundary
* @param string $end Value to end the list at. If $dir == 'newer' this
* is the upper boundary, otherwise it's the lower boundary
* @param bool $sort If false, don't add an ORDER BY clause
*/
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']
: [];
$optionOrderBy[] = $order;
$this->addOption( 'ORDER BY', $optionOrderBy );
}
}
/**
* Add a WHERE clause corresponding to a range, similar to addWhereRange,
* but converts $start and $end to database timestamps.
* @see addWhereRange
* @param string $field
* @param string $dir
* @param string $start
* @param string $end
* @param bool $sort
*/
protected function addTimestampWhereRange( $field, $dir, $start, $end, $sort = true ) {
$db = $this->getDB();
$this->addWhereRange( $field, $dir,
$db->timestampOrNull( $start ), $db->timestampOrNull( $end ), $sort );
}
/**
* Add an option such as LIMIT or USE INDEX. If an option was set
* before, the old value will be overwritten
* @param string $name Option name
* @param string|string[]|null $value Option value
*/
protected function addOption( $name, $value = null ) {
if ( is_null( $value ) ) {
$this->options[] = $name;
} else {
$this->options[$name] = $value;
}
}
/**
* Execute a SELECT query based on the values in the internal arrays
* @param string $method Function the query should be attributed to.
* You should usually use __METHOD__ here
* @param array $extraQuery Query data to add but not store in the object
* Format is [
* 'tables' => ...,
* 'fields' => ...,
* 'where' => ...,
* 'options' => ...,
* 'join_conds' => ...
* ]
* @param array|null &$hookData If set, the ApiQueryBaseBeforeQuery and
* ApiQueryBaseAfterQuery hooks will be called, and the
* ApiQueryBaseProcessRow hook will be expected.
* @return ResultWrapper
*/
protected function select( $method, $extraQuery = [], array &$hookData = null ) {
$tables = array_merge(
$this->tables,
isset( $extraQuery['tables'] ) ? (array)$extraQuery['tables'] : []
);
$fields = array_merge(
$this->fields,
isset( $extraQuery['fields'] ) ? (array)$extraQuery['fields'] : []
);
$where = array_merge(
$this->where,
isset( $extraQuery['where'] ) ? (array)$extraQuery['where'] : []
);
$options = array_merge(
$this->options,
isset( $extraQuery['options'] ) ? (array)$extraQuery['options'] : []
);
$join_conds = array_merge(
$this->join_conds,
isset( $extraQuery['join_conds'] ) ? (array)$extraQuery['join_conds'] : []
);
if ( $hookData !== null ) {
Hooks::run( 'ApiQueryBaseBeforeQuery',
[ $this, &$tables, &$fields, &$where, &$options, &$join_conds, &$hookData ]
);
}
$res = $this->getDB()->select( $tables, $fields, $where, $method, $options, $join_conds );
if ( $hookData !== null ) {
Hooks::run( 'ApiQueryBaseAfterQuery', [ $this, $res, &$hookData ] );
}
return $res;
}
/**
* Call the ApiQueryBaseProcessRow hook
*
* Generally, a module that passed $hookData to self::select() will call
* this just before calling ApiResult::addValue(), and treat a false return
* here in the same way it treats a false return from addValue().
*
* @since 1.28
* @param object $row Database row
* @param array &$data Data to be added to the result
* @param array &$hookData Hook data from ApiQueryBase::select()
* @return bool Return false if row processing should end with continuation
*/
protected function processRow( $row, array &$data, array &$hookData ) {
return Hooks::run( 'ApiQueryBaseProcessRow', [ $this, $row, &$data, &$hookData ] );
}
/**
* @param string|null $query
* @param string|null $protocol
* @return null|string
*/
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->dieWithError( 'apierror-badquery' );
}
$likeQuery = LinkFilter::keepOneWildcard( $likeQuery );
return 'el_index ' . $db->buildLike( $likeQuery );
} elseif ( !is_null( $protocol ) ) {
return 'el_index ' . $db->buildLike( "$protocol", $db->anyString() );
}
return null;
}
/**
* Filters hidden users (where the user doesn't have the right to view them)
* Also adds relevant block information
*
* @param bool $showBlockInfo
* @return void
*/
public function showHiddenUsersAddBlockInfo( $showBlockInfo ) {
$db = $this->getDB();
$this->addTables( 'ipblocks' );
$this->addJoinConds( [
'ipblocks' => [ 'LEFT JOIN', [
'ipb_user=user_id',
'ipb_expiry > ' . $db->addQuotes( $db->timestamp() ),
] ],
] );
$this->addFields( 'ipb_deleted' );
if ( $showBlockInfo ) {
$this->addFields( [
'ipb_id',
'ipb_expiry',
'ipb_timestamp'
] );
$actorQuery = ActorMigration::newMigration()->getJoin( 'ipb_by' );
$this->addTables( $actorQuery['tables'] );
$this->addFields( $actorQuery['fields'] );
$this->addJoinConds( $actorQuery['joins'] );
$commentQuery = CommentStore::getStore()->getJoin( 'ipb_reason' );
$this->addTables( $commentQuery['tables'] );
$this->addFields( $commentQuery['fields'] );
$this->addJoinConds( $commentQuery['joins'] );
}
// Don't show hidden names
if ( !$this->getUser()->isAllowed( 'hideuser' ) ) {
$this->addWhere( 'ipb_deleted = 0 OR ipb_deleted IS NULL' );
}
}
/**@}*/
/************************************************************************//**
* @name Utility methods
* @{
*/
/**
* Add information (title and namespace) about a Title object to a
* result array
* @param array &$arr Result array à la ApiResult
* @param Title $title
* @param string $prefix Module prefix
*/
public static function addTitleInfo( &$arr, $title, $prefix = '' ) {
$arr[$prefix . 'ns'] = intval( $title->getNamespace() );
$arr[$prefix . 'title'] = $title->getPrefixedText();
}
/**
* Add a sub-element under the page element with the given page ID
* @param int $pageId Page ID
* @param array $data Data array à la ApiResult
* @return bool Whether the element fit in the result
*/
protected function addPageSubItems( $pageId, $data ) {
$result = $this->getResult();
ApiResult::setIndexedTagName( $data, $this->getModulePrefix() );
return $result->addValue( [ 'query', 'pages', intval( $pageId ) ],
$this->getModuleName(),
$data );
}
/**
* Same as addPageSubItems(), but one element of $data at a time
* @param int $pageId Page ID
* @param array $item Data array à la ApiResult
* @param string|null $elemname XML element name. If null, getModuleName()
* is used
* @return bool Whether the element fit in the result
*/
protected function addPageSubItem( $pageId, $item, $elemname = null ) {
if ( is_null( $elemname ) ) {
$elemname = $this->getModulePrefix();
}
$result = $this->getResult();
$fit = $result->addValue( [ 'query', 'pages', $pageId,
$this->getModuleName() ], null, $item );
if ( !$fit ) {
return false;
}
$result->addIndexedTagName( [ 'query', 'pages', $pageId,
$this->getModuleName() ], $elemname );
return true;
}
/**
* Set a query-continue value
* @param string $paramName Parameter name
* @param string|array $paramValue Parameter value
*/
protected function setContinueEnumParameter( $paramName, $paramValue ) {
$this->getContinuationManager()->addContinueParam( $this, $paramName, $paramValue );
}
/**
* Convert an input title or title prefix into a dbkey.
*
* $namespace should always be specified in order to handle per-namespace
* capitalization settings.
*
* @param string $titlePart Title part
* @param int $namespace Namespace of the title
* @return string DBkey (no namespace prefix)
*/
public function titlePartToKey( $titlePart, $namespace = NS_MAIN ) {
$t = Title::makeTitleSafe( $namespace, $titlePart . 'x' );
if ( !$t || $t->hasFragment() ) {
// Invalid title (e.g. bad chars) or contained a '#'.
$this->dieWithError( [ 'apierror-invalidtitle', wfEscapeWikiText( $titlePart ) ] );
}
if ( $namespace != $t->getNamespace() || $t->isExternal() ) {
// This can happen in two cases. First, if you call titlePartToKey with a title part
// that looks like a namespace, but with $defaultNamespace = NS_MAIN. It would be very
// difficult to handle such a case. Such cases cannot exist and are therefore treated
// as invalid user input. The second case is when somebody specifies a title interwiki
// prefix.
$this->dieWithError( [ 'apierror-invalidtitle', wfEscapeWikiText( $titlePart ) ] );
}
return substr( $t->getDBkey(), 0, -1 );
}
/**
* 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->dieWithError( [ 'apierror-invalidtitle', wfEscapeWikiText( $titlePart ) ] );
}
return [ $t->getNamespace(), substr( $t->getDBkey(), 0, -1 ) ];
}
/**
* @param string $hash
* @return bool
*/
public function validateSha1Hash( $hash ) {
return (bool)preg_match( '/^[a-f0-9]{40}$/', $hash );
}
/**
* @param string $hash
* @return bool
*/
public function validateSha1Base36Hash( $hash ) {
return (bool)preg_match( '/^[a-z0-9]{31}$/', $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'
);
}
/**@}*/
}
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