includes/installer/DatabaseInstaller.php

   1 <?php
   2 /**
   3  * DBMS-specific installation helper.
   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 /**
  25  * Base class for DBMS-specific installation helper classes.
  26  *
  27  * @ingroup Deployment
  28  * @since 1.17
  29  */
  30 abstract class DatabaseInstaller {
  31
  32         /**
  33          * The Installer object.
  34          *
  35          * @todo Naming this parent is confusing, 'installer' would be clearer.
  36          *
  37          * @var WebInstaller
  38          */
  39         public $parent;
  40
  41         /**
  42          * The database connection.
  43          *
  44          * @var DatabaseBase
  45          */
  46         public $db = null;
  47
  48         /**
  49          * Internal variables for installation.
  50          *
  51          * @var array
  52          */
  53         protected $internalDefaults = array();
  54
  55         /**
  56          * Array of MW configuration globals this class uses.
  57          *
  58          * @var array
  59          */
  60         protected $globalNames = array();
  61
  62         /**
  63          * Return the internal name, e.g. 'mysql', or 'sqlite'.
  64          */
  65         abstract public function getName();
  66
  67         /**
  68          * @return bool Returns true if the client library is compiled in.
  69          */
  70         abstract public function isCompiled();
  71
  72         /**
  73          * Checks for installation prerequisites other than those checked by isCompiled()
  74          * @since 1.19
  75          * @return Status
  76          */
  77         public function checkPrerequisites() {
  78                 return Status::newGood();
  79         }
  80
  81         /**
  82          * Get HTML for a web form that configures this database. Configuration
  83          * at this time should be the minimum needed to connect and test
  84          * whether install or upgrade is required.
  85          *
  86          * If this is called, $this->parent can be assumed to be a WebInstaller.
  87          */
  88         abstract public function getConnectForm();
  89
  90         /**
  91          * Set variables based on the request array, assuming it was submitted
  92          * via the form returned by getConnectForm(). Validate the connection
  93          * settings by attempting to connect with them.
  94          *
  95          * If this is called, $this->parent can be assumed to be a WebInstaller.
  96          *
  97          * @return Status
  98          */
  99         abstract public function submitConnectForm();
 100
 101         /**
 102          * Get HTML for a web form that retrieves settings used for installation.
 103          * $this->parent can be assumed to be a WebInstaller.
 104          * If the DB type has no settings beyond those already configured with
 105          * getConnectForm(), this should return false.
 106          * @return bool
 107          */
 108         public function getSettingsForm() {
 109                 return false;
 110         }
 111
 112         /**
 113          * Set variables based on the request array, assuming it was submitted via
 114          * the form return by getSettingsForm().
 115          *
 116          * @return Status
 117          */
 118         public function submitSettingsForm() {
 119                 return Status::newGood();
 120         }
 121
 122         /**
 123          * Open a connection to the database using the administrative user/password
 124          * currently defined in the session, without any caching. Returns a status
 125          * object. On success, the status object will contain a Database object in
 126          * its value member.
 127          *
 128          * @return Status
 129          */
 130         abstract public function openConnection();
 131
 132         /**
 133          * Create the database and return a Status object indicating success or
 134          * failure.
 135          *
 136          * @return Status
 137          */
 138         abstract public function setupDatabase();
 139
 140         /**
 141          * Connect to the database using the administrative user/password currently
 142          * defined in the session. Returns a status object. On success, the status
 143          * object will contain a Database object in its value member.
 144          *
 145          * This will return a cached connection if one is available.
 146          *
 147          * @return Status
 148          */
 149         public function getConnection() {
 150                 if ( $this->db ) {
 151                         return Status::newGood( $this->db );
 152                 }
 153
 154                 $status = $this->openConnection();
 155                 if ( $status->isOK() ) {
 156                         $this->db = $status->value;
 157                         // Enable autocommit
 158                         $this->db->clearFlag( DBO_TRX );
 159                         $this->db->commit( __METHOD__ );
 160                 }
 161
 162                 return $status;
 163         }
 164
 165         /**
 166          * Create database tables from scratch.
 167          *
 168          * @return Status
 169          */
 170         public function createTables() {
 171                 $status = $this->getConnection();
 172                 if ( !$status->isOK() ) {
 173                         return $status;
 174                 }
 175                 $this->db->selectDB( $this->getVar( 'wgDBname' ) );
 176
 177                 if ( $this->db->tableExists( 'archive', __METHOD__ ) ) {
 178                         $status->warning( 'config-install-tables-exist' );
 179                         $this->enableLB();
 180
 181                         return $status;
 182                 }
 183
 184                 $this->db->setFlag( DBO_DDLMODE ); // For Oracle's handling of schema files
 185                 $this->db->begin( __METHOD__ );
 186
 187                 $error = $this->db->sourceFile( $this->db->getSchemaPath() );
 188                 if ( $error !== true ) {
 189                         $this->db->reportQueryError( $error, 0, '', __METHOD__ );
 190                         $this->db->rollback( __METHOD__ );
 191                         $status->fatal( 'config-install-tables-failed', $error );
 192                 } else {
 193                         $this->db->commit( __METHOD__ );
 194                 }
 195                 // Resume normal operations
 196                 if ( $status->isOk() ) {
 197                         $this->enableLB();
 198                 }
 199
 200                 return $status;
 201         }
 202
 203         /**
 204          * Create the tables for each extension the user enabled
 205          * @return Status
 206          */
 207         public function createExtensionTables() {
 208                 $status = $this->getConnection();
 209                 if ( !$status->isOK() ) {
 210                         return $status;
 211                 }
 212
 213                 // Now run updates to create tables for old extensions
 214                 DatabaseUpdater::newForDB( $this->db )->doUpdates( array( 'extensions' ) );
 215
 216                 return $status;
 217         }
 218
 219         /**
 220          * Get the DBMS-specific options for LocalSettings.php generation.
 221          *
 222          * @return String
 223          */
 224         abstract public function getLocalSettings();
 225
 226         /**
 227          * Override this to provide DBMS-specific schema variables, to be
 228          * substituted into tables.sql and other schema files.
 229          * @return array
 230          */
 231         public function getSchemaVars() {
 232                 return array();
 233         }
 234
 235         /**
 236          * Set appropriate schema variables in the current database connection.
 237          *
 238          * This should be called after any request data has been imported, but before
 239          * any write operations to the database.
 240          */
 241         public function setupSchemaVars() {
 242                 $status = $this->getConnection();
 243                 if ( $status->isOK() ) {
 244                         $status->value->setSchemaVars( $this->getSchemaVars() );
 245                 } else {
 246                         throw new MWException( __METHOD__ . ': unexpected DB connection error' );
 247                 }
 248         }
 249
 250         /**
 251          * Set up LBFactory so that wfGetDB() etc. works.
 252          * We set up a special LBFactory instance which returns the current
 253          * installer connection.
 254          */
 255         public function enableLB() {
 256                 $status = $this->getConnection();
 257                 if ( !$status->isOK() ) {
 258                         throw new MWException( __METHOD__ . ': unexpected DB connection error' );
 259                 }
 260                 LBFactory::setInstance( new LBFactory_Single( array(
 261                         'connection' => $status->value ) ) );
 262         }
 263
 264         /**
 265          * Perform database upgrades
 266          *
 267          * @return Boolean
 268          */
 269         public function doUpgrade() {
 270                 $this->setupSchemaVars();
 271                 $this->enableLB();
 272
 273                 $ret = true;
 274                 ob_start( array( $this, 'outputHandler' ) );
 275                 $up = DatabaseUpdater::newForDB( $this->db );
 276                 try {
 277                         $up->doUpdates();
 278                 } catch ( MWException $e ) {
 279                         echo "\nAn error occurred:\n";
 280                         echo $e->getText();
 281                         $ret = false;
 282                 }
 283                 $up->purgeCache();
 284                 ob_end_flush();
 285
 286                 return $ret;
 287         }
 288
 289         /**
 290          * Allow DB installers a chance to make last-minute changes before installation
 291          * occurs. This happens before setupDatabase() or createTables() is called, but
 292          * long after the constructor. Helpful for things like modifying setup steps :)
 293          */
 294         public function preInstall() {
 295         }
 296
 297         /**
 298          * Allow DB installers a chance to make checks before upgrade.
 299          */
 300         public function preUpgrade() {
 301         }
 302
 303         /**
 304          * Get an array of MW configuration globals that will be configured by this class.
 305          * @return array
 306          */
 307         public function getGlobalNames() {
 308                 return $this->globalNames;
 309         }
 310
 311         /**
 312          * Construct and initialise parent.
 313          * This is typically only called from Installer::getDBInstaller()
 314          * @param $parent
 315          */
 316         public function __construct( $parent ) {
 317                 $this->parent = $parent;
 318         }
 319
 320         /**
 321          * Convenience function.
 322          * Check if a named extension is present.
 323          *
 324          * @param $name
 325          * @return bool
 326          */
 327         protected static function checkExtension( $name ) {
 328                 return extension_loaded( $name );
 329         }
 330
 331         /**
 332          * Get the internationalised name for this DBMS.
 333          * @return String
 334          */
 335         public function getReadableName() {
 336                 // Messages: config-type-mysql, config-type-postgres, config-type-sqlite,
 337                 // config-type-oracle
 338                 return wfMessage( 'config-type-' . $this->getName() )->text();
 339         }
 340
 341         /**
 342          * Get a name=>value map of MW configuration globals that overrides.
 343          * DefaultSettings.php
 344          * @return array
 345          */
 346         public function getGlobalDefaults() {
 347                 return array();
 348         }
 349
 350         /**
 351          * Get a name=>value map of internal variables used during installation.
 352          * @return array
 353          */
 354         public function getInternalDefaults() {
 355                 return $this->internalDefaults;
 356         }
 357
 358         /**
 359          * Get a variable, taking local defaults into account.
 360          * @param $var string
 361          * @param $default null
 362          * @return mixed
 363          */
 364         public function getVar( $var, $default = null ) {
 365                 $defaults = $this->getGlobalDefaults();
 366                 $internal = $this->getInternalDefaults();
 367                 if ( isset( $defaults[$var] ) ) {
 368                         $default = $defaults[$var];
 369                 } elseif ( isset( $internal[$var] ) ) {
 370                         $default = $internal[$var];
 371                 }
 372
 373                 return $this->parent->getVar( $var, $default );
 374         }
 375
 376         /**
 377          * Convenience alias for $this->parent->setVar()
 378          * @param $name string
 379          * @param $value mixed
 380          */
 381         public function setVar( $name, $value ) {
 382                 $this->parent->setVar( $name, $value );
 383         }
 384
 385         /**
 386          * Get a labelled text box to configure a local variable.
 387          *
 388          * @param $var string
 389          * @param $label string
 390          * @param $attribs array
 391          * @param $helpData string
 392          * @return string
 393          */
 394         public function getTextBox( $var, $label, $attribs = array(), $helpData = "" ) {
 395                 $name = $this->getName() . '_' . $var;
 396                 $value = $this->getVar( $var );
 397                 if ( !isset( $attribs ) ) {
 398                         $attribs = array();
 399                 }
 400
 401                 return $this->parent->getTextBox( array(
 402                         'var' => $var,
 403                         'label' => $label,
 404                         'attribs' => $attribs,
 405                         'controlName' => $name,
 406                         'value' => $value,
 407                         'help' => $helpData
 408                 ) );
 409         }
 410
 411         /**
 412          * Get a labelled password box to configure a local variable.
 413          * Implements password hiding.
 414          *
 415          * @param $var string
 416          * @param $label string
 417          * @param $attribs array
 418          * @param $helpData string
 419          * @return string
 420          */
 421         public function getPasswordBox( $var, $label, $attribs = array(), $helpData = "" ) {
 422                 $name = $this->getName() . '_' . $var;
 423                 $value = $this->getVar( $var );
 424                 if ( !isset( $attribs ) ) {
 425                         $attribs = array();
 426                 }
 427
 428                 return $this->parent->getPasswordBox( array(
 429                         'var' => $var,
 430                         'label' => $label,
 431                         'attribs' => $attribs,
 432                         'controlName' => $name,
 433                         'value' => $value,
 434                         'help' => $helpData
 435                 ) );
 436         }
 437
 438         /**
 439          * Get a labelled checkbox to configure a local boolean variable.
 440          *
 441          * @return string
 442          */
 443         public function getCheckBox( $var, $label, $attribs = array(), $helpData = "" ) {
 444                 $name = $this->getName() . '_' . $var;
 445                 $value = $this->getVar( $var );
 446
 447                 return $this->parent->getCheckBox( array(
 448                         'var' => $var,
 449                         'label' => $label,
 450                         'attribs' => $attribs,
 451                         'controlName' => $name,
 452                         'value' => $value,
 453                         'help' => $helpData
 454                 ) );
 455         }
 456
 457         /**
 458          * Get a set of labelled radio buttons.
 459          *
 460          * @param $params Array:
 461          *    Parameters are:
 462          *      var:            The variable to be configured (required)
 463          *      label:          The message name for the label (required)
 464          *      itemLabelPrefix: The message name prefix for the item labels (required)
 465          *      values:         List of allowed values (required)
 466          *      itemAttribs     Array of attribute arrays, outer key is the value name (optional)
 467          *
 468          * @return string
 469          */
 470         public function getRadioSet( $params ) {
 471                 $params['controlName'] = $this->getName() . '_' . $params['var'];
 472                 $params['value'] = $this->getVar( $params['var'] );
 473
 474                 return $this->parent->getRadioSet( $params );
 475         }
 476
 477         /**
 478          * Convenience function to set variables based on form data.
 479          * Assumes that variables containing "password" in the name are (potentially
 480          * fake) passwords.
 481          * @param $varNames Array
 482          * @return array
 483          */
 484         public function setVarsFromRequest( $varNames ) {
 485                 return $this->parent->setVarsFromRequest( $varNames, $this->getName() . '_' );
 486         }
 487
 488         /**
 489          * Determine whether an existing installation of MediaWiki is present in
 490          * the configured administrative connection. Returns true if there is
 491          * such a wiki, false if the database doesn't exist.
 492          *
 493          * Traditionally, this is done by testing for the existence of either
 494          * the revision table or the cur table.
 495          *
 496          * @return Boolean
 497          */
 498         public function needsUpgrade() {
 499                 $status = $this->getConnection();
 500                 if ( !$status->isOK() ) {
 501                         return false;
 502                 }
 503
 504                 if ( !$this->db->selectDB( $this->getVar( 'wgDBname' ) ) ) {
 505                         return false;
 506                 }
 507
 508                 return $this->db->tableExists( 'cur', __METHOD__ ) ||
 509                         $this->db->tableExists( 'revision', __METHOD__ );
 510         }
 511
 512         /**
 513          * Get a standard install-user fieldset.
 514          *
 515          * @return String
 516          */
 517         public function getInstallUserBox() {
 518                 return Html::openElement( 'fieldset' ) .
 519                         Html::element( 'legend', array(), wfMessage( 'config-db-install-account' )->text() ) .
 520                         $this->getTextBox(
 521                                 '_InstallUser',
 522                                 'config-db-username',
 523                                 array( 'dir' => 'ltr' ),
 524                                 $this->parent->getHelpBox( 'config-db-install-username' )
 525                         ) .
 526                         $this->getPasswordBox(
 527                                 '_InstallPassword',
 528                                 'config-db-password',
 529                                 array( 'dir' => 'ltr' ),
 530                                 $this->parent->getHelpBox( 'config-db-install-password' )
 531                         ) .
 532                         Html::closeElement( 'fieldset' );
 533         }
 534
 535         /**
 536          * Submit a standard install user fieldset.
 537          * @return Status
 538          */
 539         public function submitInstallUserBox() {
 540                 $this->setVarsFromRequest( array( '_InstallUser', '_InstallPassword' ) );
 541
 542                 return Status::newGood();
 543         }
 544
 545         /**
 546          * Get a standard web-user fieldset
 547          * @param string $noCreateMsg Message to display instead of the creation checkbox.
 548          *   Set this to false to show a creation checkbox.
 549          *
 550          * @return String
 551          */
 552         public function getWebUserBox( $noCreateMsg = false ) {
 553                 $wrapperStyle = $this->getVar( '_SameAccount' ) ? 'display: none' : '';
 554                 $s = Html::openElement( 'fieldset' ) .
 555                         Html::element( 'legend', array(), wfMessage( 'config-db-web-account' )->text() ) .
 556                         $this->getCheckBox(
 557                                 '_SameAccount', 'config-db-web-account-same',
 558                                 array( 'class' => 'hideShowRadio', 'rel' => 'dbOtherAccount' )
 559                         ) .
 560                         Html::openElement( 'div', array( 'id' => 'dbOtherAccount', 'style' => $wrapperStyle ) ) .
 561                         $this->getTextBox( 'wgDBuser', 'config-db-username' ) .
 562                         $this->getPasswordBox( 'wgDBpassword', 'config-db-password' ) .
 563                         $this->parent->getHelpBox( 'config-db-web-help' );
 564                 if ( $noCreateMsg ) {
 565                         $s .= $this->parent->getWarningBox( wfMessage( $noCreateMsg )->plain() );
 566                 } else {
 567                         $s .= $this->getCheckBox( '_CreateDBAccount', 'config-db-web-create' );
 568                 }
 569                 $s .= Html::closeElement( 'div' ) . Html::closeElement( 'fieldset' );
 570
 571                 return $s;
 572         }
 573
 574         /**
 575          * Submit the form from getWebUserBox().
 576          *
 577          * @return Status
 578          */
 579         public function submitWebUserBox() {
 580                 $this->setVarsFromRequest(
 581                         array( 'wgDBuser', 'wgDBpassword', '_SameAccount', '_CreateDBAccount' )
 582                 );
 583
 584                 if ( $this->getVar( '_SameAccount' ) ) {
 585                         $this->setVar( 'wgDBuser', $this->getVar( '_InstallUser' ) );
 586                         $this->setVar( 'wgDBpassword', $this->getVar( '_InstallPassword' ) );
 587                 }
 588
 589                 if ( $this->getVar( '_CreateDBAccount' ) && strval( $this->getVar( 'wgDBpassword' ) ) == '' ) {
 590                         return Status::newFatal( 'config-db-password-empty', $this->getVar( 'wgDBuser' ) );
 591                 }
 592
 593                 return Status::newGood();
 594         }
 595
 596         /**
 597          * Common function for databases that don't understand the MySQLish syntax of interwiki.sql.
 598          *
 599          * @return Status
 600          */
 601         public function populateInterwikiTable() {
 602                 $status = $this->getConnection();
 603                 if ( !$status->isOK() ) {
 604                         return $status;
 605                 }
 606                 $this->db->selectDB( $this->getVar( 'wgDBname' ) );
 607
 608                 if ( $this->db->selectRow( 'interwiki', '*', array(), __METHOD__ ) ) {
 609                         $status->warning( 'config-install-interwiki-exists' );
 610
 611                         return $status;
 612                 }
 613                 global $IP;
 614                 wfSuppressWarnings();
 615                 $rows = file( "$IP/maintenance/interwiki.list",
 616                         FILE_IGNORE_NEW_LINES | FILE_SKIP_EMPTY_LINES );
 617                 wfRestoreWarnings();
 618                 $interwikis = array();
 619                 if ( !$rows ) {
 620                         return Status::newFatal( 'config-install-interwiki-list' );
 621                 }
 622                 foreach ( $rows as $row ) {
 623                         $row = preg_replace( '/^\s*([^#]*?)\s*(#.*)?$/', '\\1', $row ); // strip comments - whee
 624                         if ( $row == "" ) {
 625                                 continue;
 626                         }
 627                         $row .= "||";
 628                         $interwikis[] = array_combine(
 629                                 array( 'iw_prefix', 'iw_url', 'iw_local', 'iw_api', 'iw_wikiid' ),
 630                                 explode( '|', $row )
 631                         );
 632                 }
 633                 $this->db->insert( 'interwiki', $interwikis, __METHOD__ );
 634
 635                 return Status::newGood();
 636         }
 637
 638         public function outputHandler( $string ) {
 639                 return htmlspecialchars( $string );
 640         }
 641 }