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<?php
/**
* MySQL-specific installer.
*
* 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
* @ingroup Installer
*/
namespace MediaWiki\Installer;
use Wikimedia\Rdbms\DatabaseFactory;
use Wikimedia\Rdbms\DatabaseMySQL;
use Wikimedia\Rdbms\DBConnectionError;
use Wikimedia\Rdbms\IDatabase;
/**
* Class for setting up the MediaWiki database using MySQL.
*
* @ingroup Installer
* @since 1.17
*/
class MysqlInstaller extends DatabaseInstaller {
/** @inheritDoc */
protected $globalNames = [
'wgDBserver',
'wgDBname',
'wgDBuser',
'wgDBpassword',
'wgDBssl',
'wgDBprefix',
'wgDBTableOptions',
];
/** @inheritDoc */
protected $internalDefaults = [
'_MysqlEngine' => 'InnoDB',
'_MysqlCharset' => 'binary',
'_InstallUser' => 'root',
];
/** @var string[] */
public $supportedEngines = [ 'InnoDB' ];
private const MIN_VERSIONS = [
'MySQL' => '5.7.0',
'MariaDB' => '10.3',
];
/** @inheritDoc */
public static $minimumVersion;
/** @inheritDoc */
protected static $notMinimumVersionMessage;
/** @var string[] */
public $webUserPrivs = [
'DELETE',
'INSERT',
'SELECT',
'UPDATE',
'CREATE TEMPORARY TABLES',
];
/**
* @return string
*/
public function getName() {
return 'mysql';
}
/**
* @return bool
*/
public function isCompiled() {
return self::checkExtension( 'mysqli' );
}
public function getConnectForm( WebInstaller $webInstaller ): DatabaseConnectForm {
return new MysqlConnectForm( $webInstaller, $this );
}
public function getSettingsForm( WebInstaller $webInstaller ): DatabaseSettingsForm {
return new MysqlSettingsForm( $webInstaller, $this );
}
public static function meetsMinimumRequirement( IDatabase $conn ) {
$type = str_contains( $conn->getSoftwareLink(), 'MariaDB' ) ? 'MariaDB' : 'MySQL';
self::$minimumVersion = self::MIN_VERSIONS[$type];
// Used messages: config-mysql-old, config-mariadb-old
self::$notMinimumVersionMessage = 'config-' . strtolower( $type ) . '-old';
return parent::meetsMinimumRequirement( $conn );
}
/**
* @param string $type
* @return ConnectionStatus
*/
protected function openConnection( string $type ) {
$status = new ConnectionStatus;
$dbName = $type === DatabaseInstaller::CONN_CREATE_DATABASE
? null : $this->getVar( 'wgDBname' );
try {
/** @var DatabaseMySQL $db */
$db = ( new DatabaseFactory() )->create( 'mysql', [
'host' => $this->getVar( 'wgDBserver' ),
'user' => $this->getVar( '_InstallUser' ),
'password' => $this->getVar( '_InstallPassword' ),
'ssl' => $this->getVar( 'wgDBssl' ),
'dbname' => $dbName,
'flags' => 0,
'tablePrefix' => $this->getVar( 'wgDBprefix' ) ] );
$status->setDB( $db );
} catch ( DBConnectionError $e ) {
$status->fatal( 'config-connection-error', $e->getMessage() );
}
return $status;
}
public function preUpgrade() {
global $wgDBuser, $wgDBpassword;
$status = $this->getConnection( self::CONN_CREATE_TABLES );
if ( !$status->isOK() ) {
$this->parent->showStatusMessage( $status );
return;
}
$conn = $status->getDB();
# Determine existing default character set
if ( $conn->tableExists( "revision", __METHOD__ ) ) {
$revision = $this->escapeLikeInternal( $this->getVar( 'wgDBprefix' ) . 'revision', '\\' );
$res = $conn->query( "SHOW TABLE STATUS LIKE '$revision'", __METHOD__ );
$row = $res->fetchObject();
if ( !$row ) {
$this->parent->showMessage( 'config-show-table-status' );
$existingSchema = false;
$existingEngine = false;
} else {
if ( preg_match( '/^latin1/', $row->Collation ) ) {
$existingSchema = 'latin1';
} elseif ( preg_match( '/^utf8/', $row->Collation ) ) {
$existingSchema = 'utf8';
} elseif ( preg_match( '/^binary/', $row->Collation ) ) {
$existingSchema = 'binary';
} else {
$existingSchema = false;
$this->parent->showMessage( 'config-unknown-collation' );
}
$existingEngine = $row->Engine ?? $row->Type;
}
} else {
$existingSchema = false;
$existingEngine = false;
}
if ( $existingSchema && $existingSchema != $this->getVar( '_MysqlCharset' ) ) {
$this->setVar( '_MysqlCharset', $existingSchema );
}
if ( $existingEngine && $existingEngine != $this->getVar( '_MysqlEngine' ) ) {
$this->setVar( '_MysqlEngine', $existingEngine );
}
# Normal user and password are selected after this step, so for now
# just copy these two
$wgDBuser = $this->getVar( '_InstallUser' );
$wgDBpassword = $this->getVar( '_InstallPassword' );
}
/**
* @param string $s
* @param string $escapeChar
* @return string
*/
protected function escapeLikeInternal( $s, $escapeChar = '`' ) {
return str_replace( [ $escapeChar, '%', '_' ],
[ "{$escapeChar}{$escapeChar}", "{$escapeChar}%", "{$escapeChar}_" ],
$s );
}
/**
* Get a list of storage engines that are available and supported
*
* @return array
*/
public function getEngines() {
$status = $this->getConnection( self::CONN_CREATE_DATABASE );
$conn = $status->getDB();
$engines = [];
$res = $conn->query( 'SHOW ENGINES', __METHOD__ );
foreach ( $res as $row ) {
if ( $row->Support == 'YES' || $row->Support == 'DEFAULT' ) {
$engines[] = $row->Engine;
}
}
$engines = array_intersect( $this->supportedEngines, $engines );
return $engines;
}
/**
* Get a list of character sets that are available and supported
*
* @return array
*/
public function getCharsets() {
return [ 'binary', 'utf8' ];
}
/**
* Return true if the install user can create accounts
*
* @return bool
*/
public function canCreateAccounts() {
$status = $this->getConnection( self::CONN_CREATE_DATABASE );
if ( !$status->isOK() ) {
return false;
}
$conn = $status->getDB();
// Get current account name
$currentName = $conn->selectField( '', 'CURRENT_USER()', '', __METHOD__ );
$parts = explode( '@', $currentName );
if ( count( $parts ) != 2 ) {
return false;
}
$quotedUser = $conn->addQuotes( $parts[0] ) .
'@' . $conn->addQuotes( $parts[1] );
// The user needs to have INSERT on mysql.* or (global) CREATE USER to be able to CREATE USER
// The grantee will be double-quoted in this query, as required
$res = $conn->select( 'INFORMATION_SCHEMA.USER_PRIVILEGES', '*',
[ 'GRANTEE' => $quotedUser ], __METHOD__ );
$insertMysql = false;
// The user needs to have permission to GRANT all necessary permissions to the newly created user.
// This starts as a list of all necessary permissions and they are removed as they are found.
// If any are left in the list after checking for permissions, those are the missing permissions.
$missingGrantOptions = array_fill_keys( $this->webUserPrivs, true );
foreach ( $res as $row ) {
if ( $row->PRIVILEGE_TYPE == 'INSERT' ) {
$insertMysql = true;
} elseif ( $row->PRIVILEGE_TYPE == 'CREATE USER' ) {
$insertMysql = true;
}
if ( $row->IS_GRANTABLE === 'YES' ) {
unset( $missingGrantOptions[$row->PRIVILEGE_TYPE] );
}
}
// Check for DB-specific privs for mysql.*
if ( !$insertMysql ) {
$row = $conn->selectRow( 'INFORMATION_SCHEMA.SCHEMA_PRIVILEGES', '*',
[
'GRANTEE' => $quotedUser,
'TABLE_SCHEMA' => 'mysql',
'PRIVILEGE_TYPE' => 'INSERT',
], __METHOD__ );
if ( $row ) {
$insertMysql = true;
}
}
if ( !$insertMysql ) {
return false;
}
// Check for DB-level grant options
$res = $conn->select( 'INFORMATION_SCHEMA.SCHEMA_PRIVILEGES', '*',
[
'GRANTEE' => $quotedUser,
'IS_GRANTABLE' => 'YES',
], __METHOD__ );
foreach ( $res as $row ) {
$regex = $this->likeToRegex( $row->TABLE_SCHEMA );
if ( preg_match( $regex, $this->getVar( 'wgDBname' ) ) ) {
unset( $missingGrantOptions[$row->PRIVILEGE_TYPE] );
}
}
if ( count( $missingGrantOptions ) ) {
// Can't grant everything
return false;
}
return true;
}
/**
* Convert a wildcard (as used in LIKE) to a regex
* Slashes are escaped, slash terminators included
* @param string $wildcard
* @return string
*/
protected function likeToRegex( $wildcard ) {
$r = preg_quote( $wildcard, '/' );
$r = strtr( $r, [
'%' => '.*',
'_' => '.'
] );
return "/$r/s";
}
/**
* Return any table options to be applied to all tables that don't
* override them.
*
* @return string
*/
protected function getTableOptions() {
$options = [];
if ( $this->getVar( '_MysqlEngine' ) !== null ) {
$options[] = "ENGINE=" . $this->getVar( '_MysqlEngine' );
}
if ( $this->getVar( '_MysqlCharset' ) !== null ) {
$options[] = 'DEFAULT CHARSET=' . $this->getVar( '_MysqlCharset' );
}
return implode( ', ', $options );
}
/**
* Get variables to substitute into the SQL schema and patch files.
*
* @return array
*/
public function getSchemaVars() {
return [
'wgDBTableOptions' => $this->getTableOptions(),
];
}
public function getLocalSettings() {
$prefix = LocalSettingsGenerator::escapePhpString( $this->getVar( 'wgDBprefix' ) );
$useSsl = $this->getVar( 'wgDBssl' ) ? 'true' : 'false';
$tblOpts = LocalSettingsGenerator::escapePhpString( $this->getTableOptions() );
return "# MySQL specific settings
\$wgDBprefix = \"{$prefix}\";
\$wgDBssl = {$useSsl};
# MySQL table options to use during installation or update
\$wgDBTableOptions = \"{$tblOpts}\";";
}
}