includes/installer/PostgresInstaller.php

   1 <?php
   2 /**
   3  * PostgreSQL-specific installer.
   4  *
   5  * @file
   6  * @ingroup Deployment
   7  */
   8
   9 /**
  10  * Class for setting up the MediaWiki database using Postgres.
  11  *
  12  * @ingroup Deployment
  13  * @since 1.17
  14  */
  15 class PostgresInstaller extends DatabaseInstaller {
  16
  17         protected $globalNames = array(
  18                 'wgDBserver',
  19                 'wgDBport',
  20                 'wgDBname',
  21                 'wgDBuser',
  22                 'wgDBpassword',
  23                 'wgDBmwschema',
  24         );
  25
  26         protected $internalDefaults = array(
  27                 '_InstallUser' => 'postgres',
  28         );
  29
  30         var $minimumVersion = '8.3';
  31         var $maxRoleSearchDepth = 5;
  32
  33         protected $pgConns = array();
  34
  35         function getName() {
  36                 return 'postgres';
  37         }
  38
  39         public function isCompiled() {
  40                 return self::checkExtension( 'pgsql' );
  41         }
  42
  43         function getConnectForm() {
  44                 return
  45                         $this->getTextBox( 'wgDBserver', 'config-db-host', array(), $this->parent->getHelpBox( 'config-db-host-help' ) ) .
  46                         $this->getTextBox( 'wgDBport', 'config-db-port' ) .
  47                         Html::openElement( 'fieldset' ) .
  48                         Html::element( 'legend', array(), wfMsg( 'config-db-wiki-settings' ) ) .
  49                         $this->getTextBox( 'wgDBname', 'config-db-name', array(), $this->parent->getHelpBox( 'config-db-name-help' ) ) .
  50                         $this->getTextBox( 'wgDBmwschema', 'config-db-schema', array(), $this->parent->getHelpBox( 'config-db-schema-help' ) ) .
  51                         Html::closeElement( 'fieldset' ) .
  52                         $this->getInstallUserBox();
  53         }
  54
  55         function submitConnectForm() {
  56                 // Get variables from the request
  57                 $newValues = $this->setVarsFromRequest( array( 'wgDBserver', 'wgDBport',
  58                         'wgDBname', 'wgDBmwschema' ) );
  59
  60                 // Validate them
  61                 $status = Status::newGood();
  62                 if ( !strlen( $newValues['wgDBname'] ) ) {
  63                         $status->fatal( 'config-missing-db-name' );
  64                 } elseif ( !preg_match( '/^[a-zA-Z0-9_]+$/', $newValues['wgDBname'] ) ) {
  65                         $status->fatal( 'config-invalid-db-name', $newValues['wgDBname'] );
  66                 }
  67                 if ( !preg_match( '/^[a-zA-Z0-9_]*$/', $newValues['wgDBmwschema'] ) ) {
  68                         $status->fatal( 'config-invalid-schema', $newValues['wgDBmwschema'] );
  69                 }
  70
  71                 // Submit user box
  72                 if ( $status->isOK() ) {
  73                         $status->merge( $this->submitInstallUserBox() );
  74                 }
  75                 if ( !$status->isOK() ) {
  76                         return $status;
  77                 }
  78
  79                 $status = $this->getPgConnection( 'create-db' );
  80                 if ( !$status->isOK() ) {
  81                         return $status;
  82                 }
  83                 /**
  84                  * @var $conn DatabaseBase
  85                  */
  86                 $conn = $status->value;
  87
  88                 // Check version
  89                 $version = $conn->getServerVersion();
  90                 if ( version_compare( $version, $this->minimumVersion ) < 0 ) {
  91                         return Status::newFatal( 'config-postgres-old', $this->minimumVersion, $version );
  92                 }
  93
  94                 $this->setVar( 'wgDBuser', $this->getVar( '_InstallUser' ) );
  95                 $this->setVar( 'wgDBpassword', $this->getVar( '_InstallPassword' ) );
  96                 return Status::newGood();
  97         }
  98
  99         public function getConnection() {
 100                 $status = $this->getPgConnection( 'create-tables' );
 101                 if ( $status->isOK() ) {
 102                         $this->db = $status->value;
 103                 }
 104                 return $status;
 105         }
 106
 107         public function openConnection() {
 108                 return $this->openPgConnection( 'create-tables' );
 109         }
 110
 111         /**
 112          * Open a PG connection with given parameters
 113          * @param $user string User name
 114          * @param $password string Password
 115          * @param $dbName string Database name
 116          * @return Status
 117          */
 118         protected function openConnectionWithParams( $user, $password, $dbName ) {
 119                 $status = Status::newGood();
 120                 try {
 121                         $db = new DatabasePostgres(
 122                                 $this->getVar( 'wgDBserver' ),
 123                                 $user,
 124                                 $password,
 125                                 $dbName);
 126                         $status->value = $db;
 127                 } catch ( DBConnectionError $e ) {
 128                         $status->fatal( 'config-connection-error', $e->getMessage() );
 129                 }
 130                 return $status;
 131         }
 132
 133         /**
 134          * Get a special type of connection
 135          * @param $type string See openPgConnection() for details.
 136          * @return Status
 137          */
 138         protected function getPgConnection( $type ) {
 139                 if ( isset( $this->pgConns[$type] ) ) {
 140                         return Status::newGood( $this->pgConns[$type] );
 141                 }
 142                 $status = $this->openPgConnection( $type );
 143
 144                 if ( $status->isOK() ) {
 145                         /**
 146                          * @var $conn DatabaseBase
 147                          */
 148                         $conn = $status->value;
 149                         $conn->clearFlag( DBO_TRX );
 150                         $conn->commit( __METHOD__ );
 151                         $this->pgConns[$type] = $conn;
 152                 }
 153                 return $status;
 154         }
 155
 156         /**
 157          * Get a connection of a specific PostgreSQL-specific type. Connections
 158          * of a given type are cached.
 159          *
 160          * PostgreSQL lacks cross-database operations, so after the new database is
 161          * created, you need to make a separate connection to connect to that
 162          * database and add tables to it.
 163          *
 164          * New tables are owned by the user that creates them, and MediaWiki's
 165          * PostgreSQL support has always assumed that the table owner will be
 166          * $wgDBuser. So before we create new tables, we either need to either
 167          * connect as the other user or to execute a SET ROLE command. Using a
 168          * separate connection for this allows us to avoid accidental cross-module
 169          * dependencies.
 170          *
 171          * @param $type string The type of connection to get:
 172          *    - create-db:     A connection for creating DBs, suitable for pre-
 173          *                     installation.
 174          *    - create-schema: A connection to the new DB, for creating schemas and
 175          *                     other similar objects in the new DB.
 176          *    - create-tables: A connection with a role suitable for creating tables.
 177          *
 178          * @return Status object. On success, a connection object will be in the
 179          *   value member.
 180          */
 181         protected function openPgConnection( $type ) {
 182                 switch ( $type ) {
 183                         case 'create-db':
 184                                 return $this->openConnectionToAnyDB(
 185                                         $this->getVar( '_InstallUser' ),
 186                                         $this->getVar( '_InstallPassword' ) );
 187                         case 'create-schema':
 188                                 return $this->openConnectionWithParams(
 189                                         $this->getVar( '_InstallUser' ),
 190                                         $this->getVar( '_InstallPassword' ),
 191                                         $this->getVar( 'wgDBname' ) );
 192                         case 'create-tables':
 193                                 $status = $this->openPgConnection( 'create-schema' );
 194                                 if ( $status->isOK() ) {
 195                                         /**
 196                                          * @var $conn DatabaseBase
 197                                          */
 198                                         $conn = $status->value;
 199                                         $safeRole = $conn->addIdentifierQuotes( $this->getVar( 'wgDBuser' ) );
 200                                         $conn->query( "SET ROLE $safeRole" );
 201                                 }
 202                                 return $status;
 203                         default:
 204                                 throw new MWException( "Invalid special connection type: \"$type\"" );
 205                 }
 206         }
 207
 208         public function openConnectionToAnyDB( $user, $password ) {
 209                 $dbs = array(
 210                         'template1',
 211                         'postgres',
 212                 );
 213                 if ( !in_array( $this->getVar( 'wgDBname' ), $dbs ) ) {
 214                         array_unshift( $dbs, $this->getVar( 'wgDBname' ) );
 215                 }
 216                 $conn = false;
 217                 $status = Status::newGood();
 218                 foreach ( $dbs as $db ) {
 219                         try {
 220                                 $conn = new DatabasePostgres(
 221                                         $this->getVar( 'wgDBserver' ),
 222                                         $user,
 223                                         $password,
 224                                         $db );
 225                         } catch ( DBConnectionError $error ) {
 226                                 $conn = false;
 227                                 $status->fatal( 'config-pg-test-error', $db,
 228                                         $error->getMessage() );
 229                         }
 230                         if ( $conn !== false ) {
 231                                 break;
 232                         }
 233                 }
 234                 if ( $conn !== false ) {
 235                         return Status::newGood( $conn );
 236                 } else {
 237                         return $status;
 238                 }
 239         }
 240
 241         protected function getInstallUserPermissions() {
 242                 $status = $this->getPgConnection( 'create-db' );
 243                 if ( !$status->isOK() ) {
 244                         return false;
 245                 }
 246                 /**
 247                  * @var $conn DatabaseBase
 248                  */
 249                 $conn = $status->value;
 250                 $superuser = $this->getVar( '_InstallUser' );
 251
 252                 $row = $conn->selectRow( '"pg_catalog"."pg_roles"', '*',
 253                         array( 'rolname' => $superuser ), __METHOD__ );
 254                 return $row;
 255         }
 256
 257         protected function canCreateAccounts() {
 258                 $perms = $this->getInstallUserPermissions();
 259                 if ( !$perms ) {
 260                         return false;
 261                 }
 262                 return $perms->rolsuper === 't' || $perms->rolcreaterole === 't';
 263         }
 264
 265         protected function isSuperUser() {
 266                 $perms = $this->getInstallUserPermissions();
 267                 if ( !$perms ) {
 268                         return false;
 269                 }
 270                 return $perms->rolsuper === 't';
 271         }
 272
 273         public function getSettingsForm() {
 274                 if ( $this->canCreateAccounts() ) {
 275                         $noCreateMsg = false;
 276                 } else {
 277                         $noCreateMsg = 'config-db-web-no-create-privs';
 278                 }
 279                 $s = $this->getWebUserBox( $noCreateMsg );
 280
 281                 return $s;
 282         }
 283
 284         public function submitSettingsForm() {
 285                 $status = $this->submitWebUserBox();
 286                 if ( !$status->isOK() ) {
 287                         return $status;
 288                 }
 289
 290                 $same = $this->getVar( 'wgDBuser' ) === $this->getVar( '_InstallUser' );
 291
 292                 if ( $same ) {
 293                         $exists = true;
 294                 } else {
 295                         // Check if the web user exists
 296                         // Connect to the database with the install user
 297                         $status = $this->getPgConnection( 'create-db' );
 298                         if ( !$status->isOK() ) {
 299                                 return $status;
 300                         }
 301                         $exists = $status->value->roleExists( $this->getVar( 'wgDBuser' ) );
 302                 }
 303
 304                 // Validate the create checkbox
 305                 if ( $this->canCreateAccounts() && !$same && !$exists ) {
 306                         $create = $this->getVar( '_CreateDBAccount' );
 307                 } else {
 308                         $this->setVar( '_CreateDBAccount', false );
 309                         $create = false;
 310                 }
 311
 312                 if ( !$create && !$exists ) {
 313                         if ( $this->canCreateAccounts() ) {
 314                                 $msg = 'config-install-user-missing-create';
 315                         } else {
 316                                 $msg = 'config-install-user-missing';
 317                         }
 318                         return Status::newFatal( $msg, $this->getVar( 'wgDBuser' ) );
 319                 }
 320
 321                 if ( !$exists ) {
 322                         // No more checks to do
 323                         return Status::newGood();
 324                 }
 325
 326                 // Existing web account. Test the connection.
 327                 $status = $this->openConnectionToAnyDB(
 328                         $this->getVar( 'wgDBuser' ),
 329                         $this->getVar( 'wgDBpassword' ) );
 330                 if ( !$status->isOK() ) {
 331                         return $status;
 332                 }
 333
 334                 // The web user is conventionally the table owner in PostgreSQL
 335                 // installations. Make sure the install user is able to create
 336                 // objects on behalf of the web user.
 337                 if ( $same || $this->canCreateObjectsForWebUser() ) {
 338                         return Status::newGood();
 339                 } else {
 340                         return Status::newFatal( 'config-pg-not-in-role' );
 341                 }
 342         }
 343
 344         /**
 345          * Returns true if the install user is able to create objects owned
 346          * by the web user, false otherwise.
 347          * @return bool
 348          */
 349         protected function canCreateObjectsForWebUser() {
 350                 if ( $this->isSuperUser() ) {
 351                         return true;
 352                 }
 353
 354                 $status = $this->getPgConnection( 'create-db' );
 355                 if ( !$status->isOK() ) {
 356                         return false;
 357                 }
 358                 $conn = $status->value;
 359                 $installerId = $conn->selectField( '"pg_catalog"."pg_roles"', 'oid',
 360                         array( 'rolname' => $this->getVar( '_InstallUser' ) ), __METHOD__ );
 361                 $webId = $conn->selectField( '"pg_catalog"."pg_roles"', 'oid',
 362                         array( 'rolname' => $this->getVar( 'wgDBuser' ) ), __METHOD__ );
 363
 364                 return $this->isRoleMember( $conn, $installerId, $webId, $this->maxRoleSearchDepth );
 365         }
 366
 367         /**
 368          * Recursive helper for canCreateObjectsForWebUser().
 369          * @param $conn DatabaseBase object
 370          * @param $targetMember int Role ID of the member to look for
 371          * @param $group int Role ID of the group to look for
 372          * @param $maxDepth int Maximum recursive search depth
 373          * @return bool
 374          */
 375         protected function isRoleMember( $conn, $targetMember, $group, $maxDepth ) {
 376                 if ( $targetMember === $group ) {
 377                         // A role is always a member of itself
 378                         return true;
 379                 }
 380                 // Get all members of the given group
 381                 $res = $conn->select( '"pg_catalog"."pg_auth_members"', array( 'member' ),
 382                         array( 'roleid' => $group ), __METHOD__ );
 383                 foreach ( $res as $row ) {
 384                         if ( $row->member == $targetMember ) {
 385                                 // Found target member
 386                                 return true;
 387                         }
 388                         // Recursively search each member of the group to see if the target
 389                         // is a member of it, up to the given maximum depth.
 390                         if ( $maxDepth > 0 ) {
 391                                 if ( $this->isRoleMember( $conn, $targetMember, $row->member, $maxDepth - 1 ) ) {
 392                                         // Found member of member
 393                                         return true;
 394                                 }
 395                         }
 396                 }
 397                 return false;
 398         }
 399
 400         public function preInstall() {
 401                 $createDbAccount = array(
 402                         'name' => 'user',
 403                         'callback' => array( $this, 'setupUser' ),
 404                 );
 405                 $commitCB = array(
 406                         'name' => 'pg-commit',
 407                         'callback' => array( $this, 'commitChanges' ),
 408                 );
 409                 $plpgCB = array(
 410                         'name' => 'pg-plpgsql',
 411                         'callback' => array( $this, 'setupPLpgSQL' ),
 412                 );
 413                 $schemaCB = array(
 414                         'name' => 'schema',
 415                         'callback' => array( $this, 'setupSchema' )
 416                 );
 417
 418                 if( $this->getVar( '_CreateDBAccount' ) ) {
 419                         $this->parent->addInstallStep( $createDbAccount, 'database' );
 420                 }
 421                 $this->parent->addInstallStep( $commitCB, 'interwiki' );
 422                 $this->parent->addInstallStep( $plpgCB, 'database' );
 423                 $this->parent->addInstallStep( $schemaCB, 'database' );
 424         }
 425
 426         function setupDatabase() {
 427                 $status = $this->getPgConnection( 'create-db' );
 428                 if ( !$status->isOK() ) {
 429                         return $status;
 430                 }
 431                 $conn = $status->value;
 432
 433                 $dbName = $this->getVar( 'wgDBname' );
 434
 435                 $exists = $conn->selectField( '"pg_catalog"."pg_database"', '1',
 436                         array( 'datname' => $dbName ), __METHOD__ );
 437                 if ( !$exists ) {
 438                         $safedb = $conn->addIdentifierQuotes( $dbName );
 439                         $conn->query( "CREATE DATABASE $safedb", __METHOD__ );
 440                 }
 441                 return Status::newGood();
 442         }
 443
 444         function setupSchema() {
 445                 // Get a connection to the target database
 446                 $status = $this->getPgConnection( 'create-schema' );
 447                 if ( !$status->isOK() ) {
 448                         return $status;
 449                 }
 450                 $conn = $status->value;
 451
 452                 // Create the schema if necessary
 453                 $schema = $this->getVar( 'wgDBmwschema' );
 454                 $safeschema = $conn->addIdentifierQuotes( $schema );
 455                 $safeuser = $conn->addIdentifierQuotes( $this->getVar( 'wgDBuser' ) );
 456                 if( !$conn->schemaExists( $schema ) ) {
 457                         try {
 458                                 $conn->query( "CREATE SCHEMA $safeschema AUTHORIZATION $safeuser" );
 459                         } catch ( DBQueryError $e ) {
 460                                 return Status::newFatal( 'config-install-pg-schema-failed',
 461                                         $this->getVar( '_InstallUser' ), $schema );
 462                         }
 463                 }
 464
 465                 // Select the new schema in the current connection
 466                 $conn->determineCoreSchema( $schema );
 467                 return Status::newGood();
 468         }
 469
 470         function commitChanges() {
 471                 $this->db->commit( __METHOD__ );
 472                 return Status::newGood();
 473         }
 474
 475         function setupUser() {
 476                 if ( !$this->getVar( '_CreateDBAccount' ) ) {
 477                         return Status::newGood();
 478                 }
 479
 480                 $status = $this->getPgConnection( 'create-db' );
 481                 if ( !$status->isOK() ) {
 482                         return $status;
 483                 }
 484                 $conn = $status->value;
 485
 486                 $safeuser = $conn->addIdentifierQuotes( $this->getVar( 'wgDBuser' ) );
 487                 $safepass = $conn->addQuotes( $this->getVar( 'wgDBpassword' ) );
 488
 489                 // Check if the user already exists
 490                 $userExists = $conn->roleExists( $this->getVar( 'wgDBuser' ) );
 491                 if ( !$userExists ) {
 492                         // Create the user
 493                         try {
 494                                 $sql = "CREATE ROLE $safeuser NOCREATEDB LOGIN PASSWORD $safepass";
 495
 496                                 // If the install user is not a superuser, we need to make the install
 497                                 // user a member of the new user's group, so that the install user will
 498                                 // be able to create a schema and other objects on behalf of the new user.
 499                                 if ( !$this->isSuperUser() ) {
 500                                         $sql .= ' ROLE' . $conn->addIdentifierQuotes( $this->getVar( '_InstallUser' ) );
 501                                 }
 502
 503                                 $conn->query( $sql, __METHOD__ );
 504                         } catch ( DBQueryError $e ) {
 505                                 return Status::newFatal( 'config-install-user-create-failed',
 506                                         $this->getVar( 'wgDBuser' ), $e->getMessage() );
 507                         }
 508                 }
 509
 510                 return Status::newGood();
 511         }
 512
 513         function getLocalSettings() {
 514                 $port = $this->getVar( 'wgDBport' );
 515                 $schema = $this->getVar( 'wgDBmwschema' );
 516                 return
 517 "# Postgres specific settings
 518 \$wgDBport           = \"{$port}\";
 519 \$wgDBmwschema       = \"{$schema}\";";
 520         }
 521
 522         public function preUpgrade() {
 523                 global $wgDBuser, $wgDBpassword;
 524
 525                 # Normal user and password are selected after this step, so for now
 526                 # just copy these two
 527                 $wgDBuser = $this->getVar( '_InstallUser' );
 528                 $wgDBpassword = $this->getVar( '_InstallPassword' );
 529         }
 530
 531         public function createTables() {
 532                 $schema = $this->getVar( 'wgDBmwschema' );
 533
 534                 $status = $this->getConnection();
 535                 if ( !$status->isOK() ) {
 536                         return $status;
 537                 }
 538
 539                 /**
 540                  * @var $conn DatabaseBase
 541                  */
 542                 $conn = $status->value;
 543
 544                 if( $conn->tableExists( 'archive' ) ) {
 545                         $status->warning( 'config-install-tables-exist' );
 546                         $this->enableLB();
 547                         return $status;
 548                 }
 549
 550                 $conn->begin( __METHOD__ );
 551
 552                 if( !$conn->schemaExists( $schema ) ) {
 553                         $status->fatal( 'config-install-pg-schema-not-exist' );
 554                         return $status;
 555                 }
 556                 $error = $conn->sourceFile( $conn->getSchemaPath() );
 557                 if( $error !== true ) {
 558                         $conn->reportQueryError( $error, 0, '', __METHOD__ );
 559                         $conn->rollback( __METHOD__ );
 560                         $status->fatal( 'config-install-tables-failed', $error );
 561                 } else {
 562                         $conn->commit( __METHOD__ );
 563                 }
 564                 // Resume normal operations
 565                 if( $status->isOk() ) {
 566                         $this->enableLB();
 567                 }
 568                 return $status;
 569         }
 570
 571         public function setupPLpgSQL() {
 572                 // Connect as the install user, since it owns the database and so is
 573                 // the user that needs to run "CREATE LANGAUGE"
 574                 $status = $this->getPgConnection( 'create-schema' );
 575                 if ( !$status->isOK() ) {
 576                         return $status;
 577                 }
 578                 /**
 579                  * @var $conn DatabaseBase
 580                  */
 581                 $conn = $status->value;
 582
 583                 $exists = $conn->selectField( '"pg_catalog"."pg_language"', 1,
 584                         array( 'lanname' => 'plpgsql' ), __METHOD__ );
 585                 if ( $exists ) {
 586                         // Already exists, nothing to do
 587                         return Status::newGood();
 588                 }
 589
 590                 // plpgsql is not installed, but if we have a pg_pltemplate table, we
 591                 // should be able to create it
 592                 $exists = $conn->selectField(
 593                         array( '"pg_catalog"."pg_class"', '"pg_catalog"."pg_namespace"' ),
 594                         1,
 595                         array(
 596                                 'pg_namespace.oid=relnamespace',
 597                                 'nspname' => 'pg_catalog',
 598                                 'relname' => 'pg_pltemplate',
 599                         ),
 600                         __METHOD__ );
 601                 if ( $exists ) {
 602                         try {
 603                                 $conn->query( 'CREATE LANGUAGE plpgsql' );
 604                         } catch ( DBQueryError $e ) {
 605                                 return Status::newFatal( 'config-pg-no-plpgsql', $this->getVar( 'wgDBname' ) );
 606                         }
 607                 } else {
 608                         return Status::newFatal( 'config-pg-no-plpgsql', $this->getVar( 'wgDBname' ) );
 609                 }
 610                 return Status::newGood();
 611         }
 612 }