includes/installer/MysqlInstaller.php

   1 <?php
   2 /**
   3  * MySQL-specific installer.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  * http://www.gnu.org/copyleft/gpl.html
  19  *
  20  * @file
  21  * @ingroup Deployment
  22  */
  23
  24 use Wikimedia\Rdbms\Database;
  25 use Wikimedia\Rdbms\DBQueryError;
  26 use Wikimedia\Rdbms\DBConnectionError;
  27
  28 /**
  29  * Class for setting up the MediaWiki database using MySQL.
  30  *
  31  * @ingroup Deployment
  32  * @since 1.17
  33  */
  34 class MysqlInstaller extends DatabaseInstaller {
  35
  36         protected $globalNames = [
  37                 'wgDBserver',
  38                 'wgDBname',
  39                 'wgDBuser',
  40                 'wgDBpassword',
  41                 'wgDBprefix',
  42                 'wgDBTableOptions',
  43                 'wgDBmysql5',
  44         ];
  45
  46         protected $internalDefaults = [
  47                 '_MysqlEngine' => 'InnoDB',
  48                 '_MysqlCharset' => 'binary',
  49                 '_InstallUser' => 'root',
  50         ];
  51
  52         public $supportedEngines = [ 'InnoDB', 'MyISAM' ];
  53
  54         public $minimumVersion = '5.0.3';
  55
  56         public $webUserPrivs = [
  57                 'DELETE',
  58                 'INSERT',
  59                 'SELECT',
  60                 'UPDATE',
  61                 'CREATE TEMPORARY TABLES',
  62         ];
  63
  64         /**
  65          * @return string
  66          */
  67         public function getName() {
  68                 return 'mysql';
  69         }
  70
  71         /**
  72          * @return bool
  73          */
  74         public function isCompiled() {
  75                 return self::checkExtension( 'mysql' ) || self::checkExtension( 'mysqli' );
  76         }
  77
  78         /**
  79          * @return string
  80          */
  81         public function getConnectForm() {
  82                 return $this->getTextBox(
  83                         'wgDBserver',
  84                         'config-db-host',
  85                         [],
  86                         $this->parent->getHelpBox( 'config-db-host-help' )
  87                 ) .
  88                         Html::openElement( 'fieldset' ) .
  89                         Html::element( 'legend', [], wfMessage( 'config-db-wiki-settings' )->text() ) .
  90                         $this->getTextBox( 'wgDBname', 'config-db-name', [ 'dir' => 'ltr' ],
  91                                 $this->parent->getHelpBox( 'config-db-name-help' ) ) .
  92                         $this->getTextBox( 'wgDBprefix', 'config-db-prefix', [ 'dir' => 'ltr' ],
  93                                 $this->parent->getHelpBox( 'config-db-prefix-help' ) ) .
  94                         Html::closeElement( 'fieldset' ) .
  95                         $this->getInstallUserBox();
  96         }
  97
  98         public function submitConnectForm() {
  99                 // Get variables from the request.
 100                 $newValues = $this->setVarsFromRequest( [ 'wgDBserver', 'wgDBname', 'wgDBprefix' ] );
 101
 102                 // Validate them.
 103                 $status = Status::newGood();
 104                 if ( !strlen( $newValues['wgDBserver'] ) ) {
 105                         $status->fatal( 'config-missing-db-host' );
 106                 }
 107                 if ( !strlen( $newValues['wgDBname'] ) ) {
 108                         $status->fatal( 'config-missing-db-name' );
 109                 } elseif ( !preg_match( '/^[a-z0-9+_-]+$/i', $newValues['wgDBname'] ) ) {
 110                         $status->fatal( 'config-invalid-db-name', $newValues['wgDBname'] );
 111                 }
 112                 if ( !preg_match( '/^[a-z0-9_-]*$/i', $newValues['wgDBprefix'] ) ) {
 113                         $status->fatal( 'config-invalid-db-prefix', $newValues['wgDBprefix'] );
 114                 }
 115                 if ( !$status->isOK() ) {
 116                         return $status;
 117                 }
 118
 119                 // Submit user box
 120                 $status = $this->submitInstallUserBox();
 121                 if ( !$status->isOK() ) {
 122                         return $status;
 123                 }
 124
 125                 // Try to connect
 126                 $status = $this->getConnection();
 127                 if ( !$status->isOK() ) {
 128                         return $status;
 129                 }
 130                 /**
 131                  * @var $conn Database
 132                  */
 133                 $conn = $status->value;
 134
 135                 // Check version
 136                 $version = $conn->getServerVersion();
 137                 if ( version_compare( $version, $this->minimumVersion ) < 0 ) {
 138                         return Status::newFatal( 'config-mysql-old', $this->minimumVersion, $version );
 139                 }
 140
 141                 return $status;
 142         }
 143
 144         /**
 145          * @return Status
 146          */
 147         public function openConnection() {
 148                 $status = Status::newGood();
 149                 try {
 150                         $db = Database::factory( 'mysql', [
 151                                 'host' => $this->getVar( 'wgDBserver' ),
 152                                 'user' => $this->getVar( '_InstallUser' ),
 153                                 'password' => $this->getVar( '_InstallPassword' ),
 154                                 'dbname' => false,
 155                                 'flags' => 0,
 156                                 'tablePrefix' => $this->getVar( 'wgDBprefix' ) ] );
 157                         $status->value = $db;
 158                 } catch ( DBConnectionError $e ) {
 159                         $status->fatal( 'config-connection-error', $e->getMessage() );
 160                 }
 161
 162                 return $status;
 163         }
 164
 165         public function preUpgrade() {
 166                 global $wgDBuser, $wgDBpassword;
 167
 168                 $status = $this->getConnection();
 169                 if ( !$status->isOK() ) {
 170                         $this->parent->showStatusError( $status );
 171
 172                         return;
 173                 }
 174                 /**
 175                  * @var $conn Database
 176                  */
 177                 $conn = $status->value;
 178                 $conn->selectDB( $this->getVar( 'wgDBname' ) );
 179
 180                 # Determine existing default character set
 181                 if ( $conn->tableExists( "revision", __METHOD__ ) ) {
 182                         $revision = $conn->buildLike( $this->getVar( 'wgDBprefix' ) . 'revision' );
 183                         $res = $conn->query( "SHOW TABLE STATUS $revision", __METHOD__ );
 184                         $row = $conn->fetchObject( $res );
 185                         if ( !$row ) {
 186                                 $this->parent->showMessage( 'config-show-table-status' );
 187                                 $existingSchema = false;
 188                                 $existingEngine = false;
 189                         } else {
 190                                 if ( preg_match( '/^latin1/', $row->Collation ) ) {
 191                                         $existingSchema = 'latin1';
 192                                 } elseif ( preg_match( '/^utf8/', $row->Collation ) ) {
 193                                         $existingSchema = 'utf8';
 194                                 } elseif ( preg_match( '/^binary/', $row->Collation ) ) {
 195                                         $existingSchema = 'binary';
 196                                 } else {
 197                                         $existingSchema = false;
 198                                         $this->parent->showMessage( 'config-unknown-collation' );
 199                                 }
 200                                 if ( isset( $row->Engine ) ) {
 201                                         $existingEngine = $row->Engine;
 202                                 } else {
 203                                         $existingEngine = $row->Type;
 204                                 }
 205                         }
 206                 } else {
 207                         $existingSchema = false;
 208                         $existingEngine = false;
 209                 }
 210
 211                 if ( $existingSchema && $existingSchema != $this->getVar( '_MysqlCharset' ) ) {
 212                         $this->setVar( '_MysqlCharset', $existingSchema );
 213                 }
 214                 if ( $existingEngine && $existingEngine != $this->getVar( '_MysqlEngine' ) ) {
 215                         $this->setVar( '_MysqlEngine', $existingEngine );
 216                 }
 217
 218                 # Normal user and password are selected after this step, so for now
 219                 # just copy these two
 220                 $wgDBuser = $this->getVar( '_InstallUser' );
 221                 $wgDBpassword = $this->getVar( '_InstallPassword' );
 222         }
 223
 224         /**
 225          * Get a list of storage engines that are available and supported
 226          *
 227          * @return array
 228          */
 229         public function getEngines() {
 230                 $status = $this->getConnection();
 231
 232                 /**
 233                  * @var $conn Database
 234                  */
 235                 $conn = $status->value;
 236
 237                 $engines = [];
 238                 $res = $conn->query( 'SHOW ENGINES', __METHOD__ );
 239                 foreach ( $res as $row ) {
 240                         if ( $row->Support == 'YES' || $row->Support == 'DEFAULT' ) {
 241                                 $engines[] = $row->Engine;
 242                         }
 243                 }
 244                 $engines = array_intersect( $this->supportedEngines, $engines );
 245
 246                 return $engines;
 247         }
 248
 249         /**
 250          * Get a list of character sets that are available and supported
 251          *
 252          * @return array
 253          */
 254         public function getCharsets() {
 255                 return [ 'binary', 'utf8' ];
 256         }
 257
 258         /**
 259          * Return true if the install user can create accounts
 260          *
 261          * @return bool
 262          */
 263         public function canCreateAccounts() {
 264                 $status = $this->getConnection();
 265                 if ( !$status->isOK() ) {
 266                         return false;
 267                 }
 268                 /** @var $conn Database */
 269                 $conn = $status->value;
 270
 271                 // Get current account name
 272                 $currentName = $conn->selectField( '', 'CURRENT_USER()', '', __METHOD__ );
 273                 $parts = explode( '@', $currentName );
 274                 if ( count( $parts ) != 2 ) {
 275                         return false;
 276                 }
 277                 $quotedUser = $conn->addQuotes( $parts[0] ) .
 278                         '@' . $conn->addQuotes( $parts[1] );
 279
 280                 // The user needs to have INSERT on mysql.* to be able to CREATE USER
 281                 // The grantee will be double-quoted in this query, as required
 282                 $res = $conn->select( 'INFORMATION_SCHEMA.USER_PRIVILEGES', '*',
 283                         [ 'GRANTEE' => $quotedUser ], __METHOD__ );
 284                 $insertMysql = false;
 285                 $grantOptions = array_flip( $this->webUserPrivs );
 286                 foreach ( $res as $row ) {
 287                         if ( $row->PRIVILEGE_TYPE == 'INSERT' ) {
 288                                 $insertMysql = true;
 289                         }
 290                         if ( $row->IS_GRANTABLE ) {
 291                                 unset( $grantOptions[$row->PRIVILEGE_TYPE] );
 292                         }
 293                 }
 294
 295                 // Check for DB-specific privs for mysql.*
 296                 if ( !$insertMysql ) {
 297                         $row = $conn->selectRow( 'INFORMATION_SCHEMA.SCHEMA_PRIVILEGES', '*',
 298                                 [
 299                                         'GRANTEE' => $quotedUser,
 300                                         'TABLE_SCHEMA' => 'mysql',
 301                                         'PRIVILEGE_TYPE' => 'INSERT',
 302                                 ], __METHOD__ );
 303                         if ( $row ) {
 304                                 $insertMysql = true;
 305                         }
 306                 }
 307
 308                 if ( !$insertMysql ) {
 309                         return false;
 310                 }
 311
 312                 // Check for DB-level grant options
 313                 $res = $conn->select( 'INFORMATION_SCHEMA.SCHEMA_PRIVILEGES', '*',
 314                         [
 315                                 'GRANTEE' => $quotedUser,
 316                                 'IS_GRANTABLE' => 1,
 317                         ], __METHOD__ );
 318                 foreach ( $res as $row ) {
 319                         $regex = $this->likeToRegex( $row->TABLE_SCHEMA );
 320                         if ( preg_match( $regex, $this->getVar( 'wgDBname' ) ) ) {
 321                                 unset( $grantOptions[$row->PRIVILEGE_TYPE] );
 322                         }
 323                 }
 324                 if ( count( $grantOptions ) ) {
 325                         // Can't grant everything
 326                         return false;
 327                 }
 328
 329                 return true;
 330         }
 331
 332         /**
 333          * Convert a wildcard (as used in LIKE) to a regex
 334          * Slashes are escaped, slash terminators included
 335          */
 336         protected function likeToRegex( $wildcard ) {
 337                 $r = preg_quote( $wildcard, '/' );
 338                 $r = strtr( $r, [
 339                         '%' => '.*',
 340                         '_' => '.'
 341                 ] );
 342                 return "/$r/s";
 343         }
 344
 345         /**
 346          * @return string
 347          */
 348         public function getSettingsForm() {
 349                 if ( $this->canCreateAccounts() ) {
 350                         $noCreateMsg = false;
 351                 } else {
 352                         $noCreateMsg = 'config-db-web-no-create-privs';
 353                 }
 354                 $s = $this->getWebUserBox( $noCreateMsg );
 355
 356                 // Do engine selector
 357                 $engines = $this->getEngines();
 358                 // If the current default engine is not supported, use an engine that is
 359                 if ( !in_array( $this->getVar( '_MysqlEngine' ), $engines ) ) {
 360                         $this->setVar( '_MysqlEngine', reset( $engines ) );
 361                 }
 362
 363                 $s .= Xml::openElement( 'div', [
 364                         'id' => 'dbMyisamWarning'
 365                 ] );
 366                 $myisamWarning = 'config-mysql-myisam-dep';
 367                 if ( count( $engines ) === 1 ) {
 368                         $myisamWarning = 'config-mysql-only-myisam-dep';
 369                 }
 370                 $s .= $this->parent->getWarningBox( wfMessage( $myisamWarning )->text() );
 371                 $s .= Xml::closeElement( 'div' );
 372
 373                 if ( $this->getVar( '_MysqlEngine' ) != 'MyISAM' ) {
 374                         $s .= Xml::openElement( 'script' );
 375                         $s .= '$(\'#dbMyisamWarning\').hide();';
 376                         $s .= Xml::closeElement( 'script' );
 377                 }
 378
 379                 if ( count( $engines ) >= 2 ) {
 380                         // getRadioSet() builds a set of labeled radio buttons.
 381                         // For grep: The following messages are used as the item labels:
 382                         // config-mysql-innodb, config-mysql-myisam
 383                         $s .= $this->getRadioSet( [
 384                                 'var' => '_MysqlEngine',
 385                                 'label' => 'config-mysql-engine',
 386                                 'itemLabelPrefix' => 'config-mysql-',
 387                                 'values' => $engines,
 388                                 'itemAttribs' => [
 389                                         'MyISAM' => [
 390                                                 'class' => 'showHideRadio',
 391                                                 'rel' => 'dbMyisamWarning'
 392                                         ],
 393                                         'InnoDB' => [
 394                                                 'class' => 'hideShowRadio',
 395                                                 'rel' => 'dbMyisamWarning'
 396                                         ]
 397                                 ]
 398                         ] );
 399                         $s .= $this->parent->getHelpBox( 'config-mysql-engine-help' );
 400                 }
 401
 402                 // If the current default charset is not supported, use a charset that is
 403                 $charsets = $this->getCharsets();
 404                 if ( !in_array( $this->getVar( '_MysqlCharset' ), $charsets ) ) {
 405                         $this->setVar( '_MysqlCharset', reset( $charsets ) );
 406                 }
 407
 408                 // Do charset selector
 409                 if ( count( $charsets ) >= 2 ) {
 410                         // getRadioSet() builds a set of labeled radio buttons.
 411                         // For grep: The following messages are used as the item labels:
 412                         // config-mysql-binary, config-mysql-utf8
 413                         $s .= $this->getRadioSet( [
 414                                 'var' => '_MysqlCharset',
 415                                 'label' => 'config-mysql-charset',
 416                                 'itemLabelPrefix' => 'config-mysql-',
 417                                 'values' => $charsets
 418                         ] );
 419                         $s .= $this->parent->getHelpBox( 'config-mysql-charset-help' );
 420                 }
 421
 422                 return $s;
 423         }
 424
 425         /**
 426          * @return Status
 427          */
 428         public function submitSettingsForm() {
 429                 $this->setVarsFromRequest( [ '_MysqlEngine', '_MysqlCharset' ] );
 430                 $status = $this->submitWebUserBox();
 431                 if ( !$status->isOK() ) {
 432                         return $status;
 433                 }
 434
 435                 // Validate the create checkbox
 436                 $canCreate = $this->canCreateAccounts();
 437                 if ( !$canCreate ) {
 438                         $this->setVar( '_CreateDBAccount', false );
 439                         $create = false;
 440                 } else {
 441                         $create = $this->getVar( '_CreateDBAccount' );
 442                 }
 443
 444                 if ( !$create ) {
 445                         // Test the web account
 446                         try {
 447                                 Database::factory( 'mysql', [
 448                                         'host' => $this->getVar( 'wgDBserver' ),
 449                                         'user' => $this->getVar( 'wgDBuser' ),
 450                                         'password' => $this->getVar( 'wgDBpassword' ),
 451                                         'dbname' => false,
 452                                         'flags' => 0,
 453                                         'tablePrefix' => $this->getVar( 'wgDBprefix' )
 454                                 ] );
 455                         } catch ( DBConnectionError $e ) {
 456                                 return Status::newFatal( 'config-connection-error', $e->getMessage() );
 457                         }
 458                 }
 459
 460                 // Validate engines and charsets
 461                 // This is done pre-submit already so it's just for security
 462                 $engines = $this->getEngines();
 463                 if ( !in_array( $this->getVar( '_MysqlEngine' ), $engines ) ) {
 464                         $this->setVar( '_MysqlEngine', reset( $engines ) );
 465                 }
 466                 $charsets = $this->getCharsets();
 467                 if ( !in_array( $this->getVar( '_MysqlCharset' ), $charsets ) ) {
 468                         $this->setVar( '_MysqlCharset', reset( $charsets ) );
 469                 }
 470
 471                 return Status::newGood();
 472         }
 473
 474         public function preInstall() {
 475                 # Add our user callback to installSteps, right before the tables are created.
 476                 $callback = [
 477                         'name' => 'user',
 478                         'callback' => [ $this, 'setupUser' ],
 479                 ];
 480                 $this->parent->addInstallStep( $callback, 'tables' );
 481         }
 482
 483         /**
 484          * @return Status
 485          */
 486         public function setupDatabase() {
 487                 $status = $this->getConnection();
 488                 if ( !$status->isOK() ) {
 489                         return $status;
 490                 }
 491                 /** @var Database $conn */
 492                 $conn = $status->value;
 493                 $dbName = $this->getVar( 'wgDBname' );
 494                 if ( !$conn->selectDB( $dbName ) ) {
 495                         $conn->query(
 496                                 "CREATE DATABASE " . $conn->addIdentifierQuotes( $dbName ) . "CHARACTER SET utf8",
 497                                 __METHOD__
 498                         );
 499                         $conn->selectDB( $dbName );
 500                 }
 501                 $this->setupSchemaVars();
 502
 503                 return $status;
 504         }
 505
 506         /**
 507          * @return Status
 508          */
 509         public function setupUser() {
 510                 $dbUser = $this->getVar( 'wgDBuser' );
 511                 if ( $dbUser == $this->getVar( '_InstallUser' ) ) {
 512                         return Status::newGood();
 513                 }
 514                 $status = $this->getConnection();
 515                 if ( !$status->isOK() ) {
 516                         return $status;
 517                 }
 518
 519                 $this->setupSchemaVars();
 520                 $dbName = $this->getVar( 'wgDBname' );
 521                 $this->db->selectDB( $dbName );
 522                 $server = $this->getVar( 'wgDBserver' );
 523                 $password = $this->getVar( 'wgDBpassword' );
 524                 $grantableNames = [];
 525
 526                 if ( $this->getVar( '_CreateDBAccount' ) ) {
 527                         // Before we blindly try to create a user that already has access,
 528                         try { // first attempt to connect to the database
 529                                 Database::factory( 'mysql', [
 530                                         'host' => $server,
 531                                         'user' => $dbUser,
 532                                         'password' => $password,
 533                                         'dbname' => false,
 534                                         'flags' => 0,
 535                                         'tablePrefix' => $this->getVar( 'wgDBprefix' )
 536                                 ] );
 537                                 $grantableNames[] = $this->buildFullUserName( $dbUser, $server );
 538                                 $tryToCreate = false;
 539                         } catch ( DBConnectionError $e ) {
 540                                 $tryToCreate = true;
 541                         }
 542                 } else {
 543                         $grantableNames[] = $this->buildFullUserName( $dbUser, $server );
 544                         $tryToCreate = false;
 545                 }
 546
 547                 if ( $tryToCreate ) {
 548                         $createHostList = [
 549                                 $server,
 550                                 'localhost',
 551                                 'localhost.localdomain',
 552                                 '%'
 553                         ];
 554
 555                         $createHostList = array_unique( $createHostList );
 556                         $escPass = $this->db->addQuotes( $password );
 557
 558                         foreach ( $createHostList as $host ) {
 559                                 $fullName = $this->buildFullUserName( $dbUser, $host );
 560                                 if ( !$this->userDefinitelyExists( $host, $dbUser ) ) {
 561                                         try {
 562                                                 $this->db->begin( __METHOD__ );
 563                                                 $this->db->query( "CREATE USER $fullName IDENTIFIED BY $escPass", __METHOD__ );
 564                                                 $this->db->commit( __METHOD__ );
 565                                                 $grantableNames[] = $fullName;
 566                                         } catch ( DBQueryError $dqe ) {
 567                                                 if ( $this->db->lastErrno() == 1396 /* ER_CANNOT_USER */ ) {
 568                                                         // User (probably) already exists
 569                                                         $this->db->rollback( __METHOD__ );
 570                                                         $status->warning( 'config-install-user-alreadyexists', $dbUser );
 571                                                         $grantableNames[] = $fullName;
 572                                                         break;
 573                                                 } else {
 574                                                         // If we couldn't create for some bizzare reason and the
 575                                                         // user probably doesn't exist, skip the grant
 576                                                         $this->db->rollback( __METHOD__ );
 577                                                         $status->warning( 'config-install-user-create-failed', $dbUser, $dqe->getText() );
 578                                                 }
 579                                         }
 580                                 } else {
 581                                         $status->warning( 'config-install-user-alreadyexists', $dbUser );
 582                                         $grantableNames[] = $fullName;
 583                                         break;
 584                                 }
 585                         }
 586                 }
 587
 588                 // Try to grant to all the users we know exist or we were able to create
 589                 $dbAllTables = $this->db->addIdentifierQuotes( $dbName ) . '.*';
 590                 foreach ( $grantableNames as $name ) {
 591                         try {
 592                                 $this->db->begin( __METHOD__ );
 593                                 $this->db->query( "GRANT ALL PRIVILEGES ON $dbAllTables TO $name", __METHOD__ );
 594                                 $this->db->commit( __METHOD__ );
 595                         } catch ( DBQueryError $dqe ) {
 596                                 $this->db->rollback( __METHOD__ );
 597                                 $status->fatal( 'config-install-user-grant-failed', $dbUser, $dqe->getText() );
 598                         }
 599                 }
 600
 601                 return $status;
 602         }
 603
 604         /**
 605          * Return a formal 'User'@'Host' username for use in queries
 606          * @param string $name Username, quotes will be added
 607          * @param string $host Hostname, quotes will be added
 608          * @return string
 609          */
 610         private function buildFullUserName( $name, $host ) {
 611                 return $this->db->addQuotes( $name ) . '@' . $this->db->addQuotes( $host );
 612         }
 613
 614         /**
 615          * Try to see if the user account exists. Our "superuser" may not have
 616          * access to mysql.user, so false means "no" or "maybe"
 617          * @param string $host Hostname to check
 618          * @param string $user Username to check
 619          * @return bool
 620          */
 621         private function userDefinitelyExists( $host, $user ) {
 622                 try {
 623                         $res = $this->db->selectRow( 'mysql.user', [ 'Host', 'User' ],
 624                                 [ 'Host' => $host, 'User' => $user ], __METHOD__ );
 625
 626                         return (bool)$res;
 627                 } catch ( DBQueryError $dqe ) {
 628                         return false;
 629                 }
 630         }
 631
 632         /**
 633          * Return any table options to be applied to all tables that don't
 634          * override them.
 635          *
 636          * @return string
 637          */
 638         protected function getTableOptions() {
 639                 $options = [];
 640                 if ( $this->getVar( '_MysqlEngine' ) !== null ) {
 641                         $options[] = "ENGINE=" . $this->getVar( '_MysqlEngine' );
 642                 }
 643                 if ( $this->getVar( '_MysqlCharset' ) !== null ) {
 644                         $options[] = 'DEFAULT CHARSET=' . $this->getVar( '_MysqlCharset' );
 645                 }
 646
 647                 return implode( ', ', $options );
 648         }
 649
 650         /**
 651          * Get variables to substitute into tables.sql and the SQL patch files.
 652          *
 653          * @return array
 654          */
 655         public function getSchemaVars() {
 656                 return [
 657                         'wgDBTableOptions' => $this->getTableOptions(),
 658                         'wgDBname' => $this->getVar( 'wgDBname' ),
 659                         'wgDBuser' => $this->getVar( 'wgDBuser' ),
 660                         'wgDBpassword' => $this->getVar( 'wgDBpassword' ),
 661                 ];
 662         }
 663
 664         public function getLocalSettings() {
 665                 $dbmysql5 = wfBoolToStr( $this->getVar( 'wgDBmysql5', true ) );
 666                 $prefix = LocalSettingsGenerator::escapePhpString( $this->getVar( 'wgDBprefix' ) );
 667                 $tblOpts = LocalSettingsGenerator::escapePhpString( $this->getTableOptions() );
 668
 669                 return "# MySQL specific settings
 670 \$wgDBprefix = \"{$prefix}\";
 671
 672 # MySQL table options to use during installation or update
 673 \$wgDBTableOptions = \"{$tblOpts}\";
 674
 675 # Experimental charset support for MySQL 5.0.
 676 \$wgDBmysql5 = {$dbmysql5};";
 677         }
 678 }