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         ];
  44
  45         protected $internalDefaults = [
  46                 '_MysqlEngine' => 'InnoDB',
  47                 '_MysqlCharset' => 'binary',
  48                 '_InstallUser' => 'root',
  49         ];
  50
  51         public $supportedEngines = [ 'InnoDB', 'MyISAM' ];
  52
  53         public static $minimumVersion = '5.5.8';
  54         protected static $notMiniumumVerisonMessage = 'config-mysql-old';
  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( '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                 return static::meetsMinimumRequirement( $conn->getServerVersion() );
 137         }
 138
 139         /**
 140          * @return Status
 141          */
 142         public function openConnection() {
 143                 $status = Status::newGood();
 144                 try {
 145                         $db = Database::factory( 'mysql', [
 146                                 'host' => $this->getVar( 'wgDBserver' ),
 147                                 'user' => $this->getVar( '_InstallUser' ),
 148                                 'password' => $this->getVar( '_InstallPassword' ),
 149                                 'dbname' => false,
 150                                 'flags' => 0,
 151                                 'tablePrefix' => $this->getVar( 'wgDBprefix' ) ] );
 152                         $status->value = $db;
 153                 } catch ( DBConnectionError $e ) {
 154                         $status->fatal( 'config-connection-error', $e->getMessage() );
 155                 }
 156
 157                 return $status;
 158         }
 159
 160         public function preUpgrade() {
 161                 global $wgDBuser, $wgDBpassword;
 162
 163                 $status = $this->getConnection();
 164                 if ( !$status->isOK() ) {
 165                         $this->parent->showStatusError( $status );
 166
 167                         return;
 168                 }
 169                 /**
 170                  * @var $conn Database
 171                  */
 172                 $conn = $status->value;
 173                 $conn->selectDB( $this->getVar( 'wgDBname' ) );
 174
 175                 # Determine existing default character set
 176                 if ( $conn->tableExists( "revision", __METHOD__ ) ) {
 177                         $revision = $this->escapeLikeInternal( $this->getVar( 'wgDBprefix' ) . 'revision', '\\' );
 178                         $res = $conn->query( "SHOW TABLE STATUS LIKE '$revision'", __METHOD__ );
 179                         $row = $conn->fetchObject( $res );
 180                         if ( !$row ) {
 181                                 $this->parent->showMessage( 'config-show-table-status' );
 182                                 $existingSchema = false;
 183                                 $existingEngine = false;
 184                         } else {
 185                                 if ( preg_match( '/^latin1/', $row->Collation ) ) {
 186                                         $existingSchema = 'latin1';
 187                                 } elseif ( preg_match( '/^utf8/', $row->Collation ) ) {
 188                                         $existingSchema = 'utf8';
 189                                 } elseif ( preg_match( '/^binary/', $row->Collation ) ) {
 190                                         $existingSchema = 'binary';
 191                                 } else {
 192                                         $existingSchema = false;
 193                                         $this->parent->showMessage( 'config-unknown-collation' );
 194                                 }
 195                                 $existingEngine = $row->Engine ?? $row->Type;
 196                         }
 197                 } else {
 198                         $existingSchema = false;
 199                         $existingEngine = false;
 200                 }
 201
 202                 if ( $existingSchema && $existingSchema != $this->getVar( '_MysqlCharset' ) ) {
 203                         $this->setVar( '_MysqlCharset', $existingSchema );
 204                 }
 205                 if ( $existingEngine && $existingEngine != $this->getVar( '_MysqlEngine' ) ) {
 206                         $this->setVar( '_MysqlEngine', $existingEngine );
 207                 }
 208
 209                 # Normal user and password are selected after this step, so for now
 210                 # just copy these two
 211                 $wgDBuser = $this->getVar( '_InstallUser' );
 212                 $wgDBpassword = $this->getVar( '_InstallPassword' );
 213         }
 214
 215         /**
 216          * @param string $s
 217          * @param string $escapeChar
 218          * @return string
 219          */
 220         protected function escapeLikeInternal( $s, $escapeChar = '`' ) {
 221                 return str_replace( [ $escapeChar, '%', '_' ],
 222                         [ "{$escapeChar}{$escapeChar}", "{$escapeChar}%", "{$escapeChar}_" ],
 223                         $s );
 224         }
 225
 226         /**
 227          * Get a list of storage engines that are available and supported
 228          *
 229          * @return array
 230          */
 231         public function getEngines() {
 232                 $status = $this->getConnection();
 233
 234                 /**
 235                  * @var $conn Database
 236                  */
 237                 $conn = $status->value;
 238
 239                 $engines = [];
 240                 $res = $conn->query( 'SHOW ENGINES', __METHOD__ );
 241                 foreach ( $res as $row ) {
 242                         if ( $row->Support == 'YES' || $row->Support == 'DEFAULT' ) {
 243                                 $engines[] = $row->Engine;
 244                         }
 245                 }
 246                 $engines = array_intersect( $this->supportedEngines, $engines );
 247
 248                 return $engines;
 249         }
 250
 251         /**
 252          * Get a list of character sets that are available and supported
 253          *
 254          * @return array
 255          */
 256         public function getCharsets() {
 257                 return [ 'binary', 'utf8' ];
 258         }
 259
 260         /**
 261          * Return true if the install user can create accounts
 262          *
 263          * @return bool
 264          */
 265         public function canCreateAccounts() {
 266                 $status = $this->getConnection();
 267                 if ( !$status->isOK() ) {
 268                         return false;
 269                 }
 270                 /** @var Database $conn */
 271                 $conn = $status->value;
 272
 273                 // Get current account name
 274                 $currentName = $conn->selectField( '', 'CURRENT_USER()', '', __METHOD__ );
 275                 $parts = explode( '@', $currentName );
 276                 if ( count( $parts ) != 2 ) {
 277                         return false;
 278                 }
 279                 $quotedUser = $conn->addQuotes( $parts[0] ) .
 280                         '@' . $conn->addQuotes( $parts[1] );
 281
 282                 // The user needs to have INSERT on mysql.* to be able to CREATE USER
 283                 // The grantee will be double-quoted in this query, as required
 284                 $res = $conn->select( 'INFORMATION_SCHEMA.USER_PRIVILEGES', '*',
 285                         [ 'GRANTEE' => $quotedUser ], __METHOD__ );
 286                 $insertMysql = false;
 287                 $grantOptions = array_flip( $this->webUserPrivs );
 288                 foreach ( $res as $row ) {
 289                         if ( $row->PRIVILEGE_TYPE == 'INSERT' ) {
 290                                 $insertMysql = true;
 291                         }
 292                         if ( $row->IS_GRANTABLE ) {
 293                                 unset( $grantOptions[$row->PRIVILEGE_TYPE] );
 294                         }
 295                 }
 296
 297                 // Check for DB-specific privs for mysql.*
 298                 if ( !$insertMysql ) {
 299                         $row = $conn->selectRow( 'INFORMATION_SCHEMA.SCHEMA_PRIVILEGES', '*',
 300                                 [
 301                                         'GRANTEE' => $quotedUser,
 302                                         'TABLE_SCHEMA' => 'mysql',
 303                                         'PRIVILEGE_TYPE' => 'INSERT',
 304                                 ], __METHOD__ );
 305                         if ( $row ) {
 306                                 $insertMysql = true;
 307                         }
 308                 }
 309
 310                 if ( !$insertMysql ) {
 311                         return false;
 312                 }
 313
 314                 // Check for DB-level grant options
 315                 $res = $conn->select( 'INFORMATION_SCHEMA.SCHEMA_PRIVILEGES', '*',
 316                         [
 317                                 'GRANTEE' => $quotedUser,
 318                                 'IS_GRANTABLE' => 1,
 319                         ], __METHOD__ );
 320                 foreach ( $res as $row ) {
 321                         $regex = $this->likeToRegex( $row->TABLE_SCHEMA );
 322                         if ( preg_match( $regex, $this->getVar( 'wgDBname' ) ) ) {
 323                                 unset( $grantOptions[$row->PRIVILEGE_TYPE] );
 324                         }
 325                 }
 326                 if ( count( $grantOptions ) ) {
 327                         // Can't grant everything
 328                         return false;
 329                 }
 330
 331                 return true;
 332         }
 333
 334         /**
 335          * Convert a wildcard (as used in LIKE) to a regex
 336          * Slashes are escaped, slash terminators included
 337          * @param string $wildcard
 338          * @return string
 339          */
 340         protected function likeToRegex( $wildcard ) {
 341                 $r = preg_quote( $wildcard, '/' );
 342                 $r = strtr( $r, [
 343                         '%' => '.*',
 344                         '_' => '.'
 345                 ] );
 346                 return "/$r/s";
 347         }
 348
 349         /**
 350          * @return string
 351          */
 352         public function getSettingsForm() {
 353                 if ( $this->canCreateAccounts() ) {
 354                         $noCreateMsg = false;
 355                 } else {
 356                         $noCreateMsg = 'config-db-web-no-create-privs';
 357                 }
 358                 $s = $this->getWebUserBox( $noCreateMsg );
 359
 360                 // Do engine selector
 361                 $engines = $this->getEngines();
 362                 // If the current default engine is not supported, use an engine that is
 363                 if ( !in_array( $this->getVar( '_MysqlEngine' ), $engines ) ) {
 364                         $this->setVar( '_MysqlEngine', reset( $engines ) );
 365                 }
 366
 367                 $s .= Xml::openElement( 'div', [
 368                         'id' => 'dbMyisamWarning'
 369                 ] );
 370                 $myisamWarning = 'config-mysql-myisam-dep';
 371                 if ( count( $engines ) === 1 ) {
 372                         $myisamWarning = 'config-mysql-only-myisam-dep';
 373                 }
 374                 $s .= $this->parent->getWarningBox( wfMessage( $myisamWarning )->text() );
 375                 $s .= Xml::closeElement( 'div' );
 376
 377                 if ( $this->getVar( '_MysqlEngine' ) != 'MyISAM' ) {
 378                         $s .= Xml::openElement( 'script' );
 379                         $s .= '$(\'#dbMyisamWarning\').hide();';
 380                         $s .= Xml::closeElement( 'script' );
 381                 }
 382
 383                 if ( count( $engines ) >= 2 ) {
 384                         // getRadioSet() builds a set of labeled radio buttons.
 385                         // For grep: The following messages are used as the item labels:
 386                         // config-mysql-innodb, config-mysql-myisam
 387                         $s .= $this->getRadioSet( [
 388                                 'var' => '_MysqlEngine',
 389                                 'label' => 'config-mysql-engine',
 390                                 'itemLabelPrefix' => 'config-mysql-',
 391                                 'values' => $engines,
 392                                 'itemAttribs' => [
 393                                         'MyISAM' => [
 394                                                 'class' => 'showHideRadio',
 395                                                 'rel' => 'dbMyisamWarning'
 396                                         ],
 397                                         'InnoDB' => [
 398                                                 'class' => 'hideShowRadio',
 399                                                 'rel' => 'dbMyisamWarning'
 400                                         ]
 401                                 ]
 402                         ] );
 403                         $s .= $this->parent->getHelpBox( 'config-mysql-engine-help' );
 404                 }
 405
 406                 // If the current default charset is not supported, use a charset that is
 407                 $charsets = $this->getCharsets();
 408                 if ( !in_array( $this->getVar( '_MysqlCharset' ), $charsets ) ) {
 409                         $this->setVar( '_MysqlCharset', reset( $charsets ) );
 410                 }
 411
 412                 return $s;
 413         }
 414
 415         /**
 416          * @return Status
 417          */
 418         public function submitSettingsForm() {
 419                 $this->setVarsFromRequest( [ '_MysqlEngine', '_MysqlCharset' ] );
 420                 $status = $this->submitWebUserBox();
 421                 if ( !$status->isOK() ) {
 422                         return $status;
 423                 }
 424
 425                 // Validate the create checkbox
 426                 $canCreate = $this->canCreateAccounts();
 427                 if ( !$canCreate ) {
 428                         $this->setVar( '_CreateDBAccount', false );
 429                         $create = false;
 430                 } else {
 431                         $create = $this->getVar( '_CreateDBAccount' );
 432                 }
 433
 434                 if ( !$create ) {
 435                         // Test the web account
 436                         try {
 437                                 Database::factory( 'mysql', [
 438                                         'host' => $this->getVar( 'wgDBserver' ),
 439                                         'user' => $this->getVar( 'wgDBuser' ),
 440                                         'password' => $this->getVar( 'wgDBpassword' ),
 441                                         'dbname' => false,
 442                                         'flags' => 0,
 443                                         'tablePrefix' => $this->getVar( 'wgDBprefix' )
 444                                 ] );
 445                         } catch ( DBConnectionError $e ) {
 446                                 return Status::newFatal( 'config-connection-error', $e->getMessage() );
 447                         }
 448                 }
 449
 450                 // Validate engines and charsets
 451                 // This is done pre-submit already so it's just for security
 452                 $engines = $this->getEngines();
 453                 if ( !in_array( $this->getVar( '_MysqlEngine' ), $engines ) ) {
 454                         $this->setVar( '_MysqlEngine', reset( $engines ) );
 455                 }
 456                 $charsets = $this->getCharsets();
 457                 if ( !in_array( $this->getVar( '_MysqlCharset' ), $charsets ) ) {
 458                         $this->setVar( '_MysqlCharset', reset( $charsets ) );
 459                 }
 460
 461                 return Status::newGood();
 462         }
 463
 464         public function preInstall() {
 465                 # Add our user callback to installSteps, right before the tables are created.
 466                 $callback = [
 467                         'name' => 'user',
 468                         'callback' => [ $this, 'setupUser' ],
 469                 ];
 470                 $this->parent->addInstallStep( $callback, 'tables' );
 471         }
 472
 473         /**
 474          * @return Status
 475          */
 476         public function setupDatabase() {
 477                 $status = $this->getConnection();
 478                 if ( !$status->isOK() ) {
 479                         return $status;
 480                 }
 481                 /** @var Database $conn */
 482                 $conn = $status->value;
 483                 $dbName = $this->getVar( 'wgDBname' );
 484                 if ( !$this->databaseExists( $dbName ) ) {
 485                         $conn->query(
 486                                 "CREATE DATABASE " . $conn->addIdentifierQuotes( $dbName ) . "CHARACTER SET utf8",
 487                                 __METHOD__
 488                         );
 489                 }
 490                 $conn->selectDB( $dbName );
 491                 $this->setupSchemaVars();
 492
 493                 return $status;
 494         }
 495
 496         /**
 497          * Try to see if a given database exists
 498          * @param string $dbName Database name to check
 499          * @return bool
 500          */
 501         private function databaseExists( $dbName ) {
 502                 $encDatabase = $this->db->addQuotes( $dbName );
 503
 504                 return $this->db->query(
 505                         "SELECT 1 FROM INFORMATION_SCHEMA.SCHEMATA WHERE SCHEMA_NAME = $encDatabase",
 506                         __METHOD__
 507                 )->numRows() > 0;
 508         }
 509
 510         /**
 511          * @return Status
 512          */
 513         public function setupUser() {
 514                 $dbUser = $this->getVar( 'wgDBuser' );
 515                 if ( $dbUser == $this->getVar( '_InstallUser' ) ) {
 516                         return Status::newGood();
 517                 }
 518                 $status = $this->getConnection();
 519                 if ( !$status->isOK() ) {
 520                         return $status;
 521                 }
 522
 523                 $this->setupSchemaVars();
 524                 $dbName = $this->getVar( 'wgDBname' );
 525                 $this->db->selectDB( $dbName );
 526                 $server = $this->getVar( 'wgDBserver' );
 527                 $password = $this->getVar( 'wgDBpassword' );
 528                 $grantableNames = [];
 529
 530                 if ( $this->getVar( '_CreateDBAccount' ) ) {
 531                         // Before we blindly try to create a user that already has access,
 532                         try { // first attempt to connect to the database
 533                                 Database::factory( 'mysql', [
 534                                         'host' => $server,
 535                                         'user' => $dbUser,
 536                                         'password' => $password,
 537                                         'dbname' => false,
 538                                         'flags' => 0,
 539                                         'tablePrefix' => $this->getVar( 'wgDBprefix' )
 540                                 ] );
 541                                 $grantableNames[] = $this->buildFullUserName( $dbUser, $server );
 542                                 $tryToCreate = false;
 543                         } catch ( DBConnectionError $e ) {
 544                                 $tryToCreate = true;
 545                         }
 546                 } else {
 547                         $grantableNames[] = $this->buildFullUserName( $dbUser, $server );
 548                         $tryToCreate = false;
 549                 }
 550
 551                 if ( $tryToCreate ) {
 552                         $createHostList = [
 553                                 $server,
 554                                 'localhost',
 555                                 'localhost.localdomain',
 556                                 '%'
 557                         ];
 558
 559                         $createHostList = array_unique( $createHostList );
 560                         $escPass = $this->db->addQuotes( $password );
 561
 562                         foreach ( $createHostList as $host ) {
 563                                 $fullName = $this->buildFullUserName( $dbUser, $host );
 564                                 if ( !$this->userDefinitelyExists( $host, $dbUser ) ) {
 565                                         try {
 566                                                 $this->db->begin( __METHOD__ );
 567                                                 $this->db->query( "CREATE USER $fullName IDENTIFIED BY $escPass", __METHOD__ );
 568                                                 $this->db->commit( __METHOD__ );
 569                                                 $grantableNames[] = $fullName;
 570                                         } catch ( DBQueryError $dqe ) {
 571                                                 if ( $this->db->lastErrno() == 1396 /* ER_CANNOT_USER */ ) {
 572                                                         // User (probably) already exists
 573                                                         $this->db->rollback( __METHOD__ );
 574                                                         $status->warning( 'config-install-user-alreadyexists', $dbUser );
 575                                                         $grantableNames[] = $fullName;
 576                                                         break;
 577                                                 } else {
 578                                                         // If we couldn't create for some bizzare reason and the
 579                                                         // user probably doesn't exist, skip the grant
 580                                                         $this->db->rollback( __METHOD__ );
 581                                                         $status->warning( 'config-install-user-create-failed', $dbUser, $dqe->getMessage() );
 582                                                 }
 583                                         }
 584                                 } else {
 585                                         $status->warning( 'config-install-user-alreadyexists', $dbUser );
 586                                         $grantableNames[] = $fullName;
 587                                         break;
 588                                 }
 589                         }
 590                 }
 591
 592                 // Try to grant to all the users we know exist or we were able to create
 593                 $dbAllTables = $this->db->addIdentifierQuotes( $dbName ) . '.*';
 594                 foreach ( $grantableNames as $name ) {
 595                         try {
 596                                 $this->db->begin( __METHOD__ );
 597                                 $this->db->query( "GRANT ALL PRIVILEGES ON $dbAllTables TO $name", __METHOD__ );
 598                                 $this->db->commit( __METHOD__ );
 599                         } catch ( DBQueryError $dqe ) {
 600                                 $this->db->rollback( __METHOD__ );
 601                                 $status->fatal( 'config-install-user-grant-failed', $dbUser, $dqe->getMessage() );
 602                         }
 603                 }
 604
 605                 return $status;
 606         }
 607
 608         /**
 609          * Return a formal 'User'@'Host' username for use in queries
 610          * @param string $name Username, quotes will be added
 611          * @param string $host Hostname, quotes will be added
 612          * @return string
 613          */
 614         private function buildFullUserName( $name, $host ) {
 615                 return $this->db->addQuotes( $name ) . '@' . $this->db->addQuotes( $host );
 616         }
 617
 618         /**
 619          * Try to see if the user account exists. Our "superuser" may not have
 620          * access to mysql.user, so false means "no" or "maybe"
 621          * @param string $host Hostname to check
 622          * @param string $user Username to check
 623          * @return bool
 624          */
 625         private function userDefinitelyExists( $host, $user ) {
 626                 try {
 627                         $res = $this->db->selectRow( 'mysql.user', [ 'Host', 'User' ],
 628                                 [ 'Host' => $host, 'User' => $user ], __METHOD__ );
 629
 630                         return (bool)$res;
 631                 } catch ( DBQueryError $dqe ) {
 632                         return false;
 633                 }
 634         }
 635
 636         /**
 637          * Return any table options to be applied to all tables that don't
 638          * override them.
 639          *
 640          * @return string
 641          */
 642         protected function getTableOptions() {
 643                 $options = [];
 644                 if ( $this->getVar( '_MysqlEngine' ) !== null ) {
 645                         $options[] = "ENGINE=" . $this->getVar( '_MysqlEngine' );
 646                 }
 647                 if ( $this->getVar( '_MysqlCharset' ) !== null ) {
 648                         $options[] = 'DEFAULT CHARSET=' . $this->getVar( '_MysqlCharset' );
 649                 }
 650
 651                 return implode( ', ', $options );
 652         }
 653
 654         /**
 655          * Get variables to substitute into tables.sql and the SQL patch files.
 656          *
 657          * @return array
 658          */
 659         public function getSchemaVars() {
 660                 return [
 661                         'wgDBTableOptions' => $this->getTableOptions(),
 662                         'wgDBname' => $this->getVar( 'wgDBname' ),
 663                         'wgDBuser' => $this->getVar( 'wgDBuser' ),
 664                         'wgDBpassword' => $this->getVar( 'wgDBpassword' ),
 665                 ];
 666         }
 667
 668         public function getLocalSettings() {
 669                 $prefix = LocalSettingsGenerator::escapePhpString( $this->getVar( 'wgDBprefix' ) );
 670                 $tblOpts = LocalSettingsGenerator::escapePhpString( $this->getTableOptions() );
 671
 672                 return "# MySQL specific settings
 673 \$wgDBprefix = \"{$prefix}\";
 674
 675 # MySQL table options to use during installation or update
 676 \$wgDBTableOptions = \"{$tblOpts}\";";
 677         }
 678 }