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                 return $status;
 162         }
 163
 164         /**
 165          * Create database tables from scratch.
 166          *
 167          * @return Status
 168          */
 169         public function createTables() {
 170                 $status = $this->getConnection();
 171                 if ( !$status->isOK() ) {
 172                         return $status;
 173                 }
 174                 $this->db->selectDB( $this->getVar( 'wgDBname' ) );
 175
 176                 if ( $this->db->tableExists( 'archive', __METHOD__ ) ) {
 177                         $status->warning( 'config-install-tables-exist' );
 178                         $this->enableLB();
 179                         return $status;
 180                 }
 181
 182                 $this->db->setFlag( DBO_DDLMODE ); // For Oracle's handling of schema files
 183                 $this->db->begin( __METHOD__ );
 184
 185                 $error = $this->db->sourceFile( $this->db->getSchemaPath() );
 186                 if ( $error !== true ) {
 187                         $this->db->reportQueryError( $error, 0, '', __METHOD__ );
 188                         $this->db->rollback( __METHOD__ );
 189                         $status->fatal( 'config-install-tables-failed', $error );
 190                 } else {
 191                         $this->db->commit( __METHOD__ );
 192                 }
 193                 // Resume normal operations
 194                 if ( $status->isOk() ) {
 195                         $this->enableLB();
 196                 }
 197                 return $status;
 198         }
 199
 200         /**
 201          * Create the tables for each extension the user enabled
 202          * @return Status
 203          */
 204         public function createExtensionTables() {
 205                 $status = $this->getConnection();
 206                 if ( !$status->isOK() ) {
 207                         return $status;
 208                 }
 209
 210                 // Now run updates to create tables for old extensions
 211                 DatabaseUpdater::newForDB( $this->db )->doUpdates( array( 'extensions' ) );
 212
 213                 return $status;
 214         }
 215
 216         /**
 217          * Get the DBMS-specific options for LocalSettings.php generation.
 218          *
 219          * @return String
 220          */
 221         abstract public function getLocalSettings();
 222
 223         /**
 224          * Override this to provide DBMS-specific schema variables, to be
 225          * substituted into tables.sql and other schema files.
 226          * @return array
 227          */
 228         public function getSchemaVars() {
 229                 return array();
 230         }
 231
 232         /**
 233          * Set appropriate schema variables in the current database connection.
 234          *
 235          * This should be called after any request data has been imported, but before
 236          * any write operations to the database.
 237          */
 238         public function setupSchemaVars() {
 239                 $status = $this->getConnection();
 240                 if ( $status->isOK() ) {
 241                         $status->value->setSchemaVars( $this->getSchemaVars() );
 242                 } else {
 243                         throw new MWException( __METHOD__ . ': unexpected DB connection error' );
 244                 }
 245         }
 246
 247         /**
 248          * Set up LBFactory so that wfGetDB() etc. works.
 249          * We set up a special LBFactory instance which returns the current
 250          * installer connection.
 251          */
 252         public function enableLB() {
 253                 $status = $this->getConnection();
 254                 if ( !$status->isOK() ) {
 255                         throw new MWException( __METHOD__ . ': unexpected DB connection error' );
 256                 }
 257                 LBFactory::setInstance( new LBFactory_Single( array(
 258                         'connection' => $status->value ) ) );
 259         }
 260
 261         /**
 262          * Perform database upgrades
 263          *
 264          * @return Boolean
 265          */
 266         public function doUpgrade() {
 267                 $this->setupSchemaVars();
 268                 $this->enableLB();
 269
 270                 $ret = true;
 271                 ob_start( array( $this, 'outputHandler' ) );
 272                 $up = DatabaseUpdater::newForDB( $this->db );
 273                 try {
 274                         $up->doUpdates();
 275                 } catch ( MWException $e ) {
 276                         echo "\nAn error occurred:\n";
 277                         echo $e->getText();
 278                         $ret = false;
 279                 }
 280                 $up->purgeCache();
 281                 ob_end_flush();
 282                 return $ret;
 283         }
 284
 285         /**
 286          * Allow DB installers a chance to make last-minute changes before installation
 287          * occurs. This happens before setupDatabase() or createTables() is called, but
 288          * long after the constructor. Helpful for things like modifying setup steps :)
 289          */
 290         public function preInstall() {
 291
 292         }
 293
 294         /**
 295          * Allow DB installers a chance to make checks before upgrade.
 296          */
 297         public function preUpgrade() {
 298
 299         }
 300
 301         /**
 302          * Get an array of MW configuration globals that will be configured by this class.
 303          * @return array
 304          */
 305         public function getGlobalNames() {
 306                 return $this->globalNames;
 307         }
 308
 309         /**
 310          * Construct and initialise parent.
 311          * This is typically only called from Installer::getDBInstaller()
 312          * @param $parent
 313          */
 314         public function __construct( $parent ) {
 315                 $this->parent = $parent;
 316         }
 317
 318         /**
 319          * Convenience function.
 320          * Check if a named extension is present.
 321          *
 322          * @see wfDl
 323          * @param $name
 324          * @return bool
 325          */
 326         protected static function checkExtension( $name ) {
 327                 wfSuppressWarnings();
 328                 $compiled = wfDl( $name );
 329                 wfRestoreWarnings();
 330                 return $compiled;
 331         }
 332
 333         /**
 334          * Get the internationalised name for this DBMS.
 335          * @return String
 336          */
 337         public function getReadableName() {
 338                 // Give grep a chance to find the usages:
 339                 // config-type-mysql, config-type-postgres, config-type-sqlite, config-type-oracle
 340                 return wfMessage( 'config-type-' . $this->getName() )->text();
 341         }
 342
 343         /**
 344          * Get a name=>value map of MW configuration globals that overrides.
 345          * DefaultSettings.php
 346          * @return array
 347          */
 348         public function getGlobalDefaults() {
 349                 return array();
 350         }
 351
 352         /**
 353          * Get a name=>value map of internal variables used during installation.
 354          * @return array
 355          */
 356         public function getInternalDefaults() {
 357                 return $this->internalDefaults;
 358         }
 359
 360         /**
 361          * Get a variable, taking local defaults into account.
 362          * @param $var string
 363          * @param $default null
 364          * @return mixed
 365          */
 366         public function getVar( $var, $default = null ) {
 367                 $defaults = $this->getGlobalDefaults();
 368                 $internal = $this->getInternalDefaults();
 369                 if ( isset( $defaults[$var] ) ) {
 370                         $default = $defaults[$var];
 371                 } elseif ( isset( $internal[$var] ) ) {
 372                         $default = $internal[$var];
 373                 }
 374                 return $this->parent->getVar( $var, $default );
 375         }
 376
 377         /**
 378          * Convenience alias for $this->parent->setVar()
 379          * @param $name string
 380          * @param $value mixed
 381          */
 382         public function setVar( $name, $value ) {
 383                 $this->parent->setVar( $name, $value );
 384         }
 385
 386         /**
 387          * Get a labelled text box to configure a local variable.
 388          *
 389          * @param $var string
 390          * @param $label string
 391          * @param $attribs array
 392          * @param $helpData string
 393          * @return string
 394          */
 395         public function getTextBox( $var, $label, $attribs = array(), $helpData = "" ) {
 396                 $name = $this->getName() . '_' . $var;
 397                 $value = $this->getVar( $var );
 398                 if ( !isset( $attribs ) ) {
 399                         $attribs = array();
 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                 return $this->parent->getPasswordBox( array(
 428                         'var' => $var,
 429                         'label' => $label,
 430                         'attribs' => $attribs,
 431                         'controlName' => $name,
 432                         'value' => $value,
 433                         'help' => $helpData
 434                 ) );
 435         }
 436
 437         /**
 438          * Get a labelled checkbox to configure a local boolean variable.
 439          *
 440          * @return string
 441          */
 442         public function getCheckBox( $var, $label, $attribs = array(), $helpData = "" ) {
 443                 $name = $this->getName() . '_' . $var;
 444                 $value = $this->getVar( $var );
 445                 return $this->parent->getCheckBox( array(
 446                         'var' => $var,
 447                         'label' => $label,
 448                         'attribs' => $attribs,
 449                         'controlName' => $name,
 450                         'value' => $value,
 451                         'help' => $helpData
 452                 ));
 453         }
 454
 455         /**
 456          * Get a set of labelled radio buttons.
 457          *
 458          * @param $params Array:
 459          *    Parameters are:
 460          *      var:            The variable to be configured (required)
 461          *      label:          The message name for the label (required)
 462          *      itemLabelPrefix: The message name prefix for the item labels (required)
 463          *      values:         List of allowed values (required)
 464          *      itemAttribs     Array of attribute arrays, outer key is the value name (optional)
 465          *
 466          * @return string
 467          */
 468         public function getRadioSet( $params ) {
 469                 $params['controlName'] = $this->getName() . '_' . $params['var'];
 470                 $params['value'] = $this->getVar( $params['var'] );
 471                 return $this->parent->getRadioSet( $params );
 472         }
 473
 474         /**
 475          * Convenience function to set variables based on form data.
 476          * Assumes that variables containing "password" in the name are (potentially
 477          * fake) passwords.
 478          * @param $varNames Array
 479          * @return array
 480          */
 481         public function setVarsFromRequest( $varNames ) {
 482                 return $this->parent->setVarsFromRequest( $varNames, $this->getName() . '_' );
 483         }
 484
 485         /**
 486          * Determine whether an existing installation of MediaWiki is present in
 487          * the configured administrative connection. Returns true if there is
 488          * such a wiki, false if the database doesn't exist.
 489          *
 490          * Traditionally, this is done by testing for the existence of either
 491          * the revision table or the cur table.
 492          *
 493          * @return Boolean
 494          */
 495         public function needsUpgrade() {
 496                 $status = $this->getConnection();
 497                 if ( !$status->isOK() ) {
 498                         return false;
 499                 }
 500
 501                 if ( !$this->db->selectDB( $this->getVar( 'wgDBname' ) ) ) {
 502                         return false;
 503                 }
 504                 return $this->db->tableExists( 'cur', __METHOD__ ) || $this->db->tableExists( 'revision', __METHOD__ );
 505         }
 506
 507         /**
 508          * Get a standard install-user fieldset.
 509          *
 510          * @return String
 511          */
 512         public function getInstallUserBox() {
 513                 return Html::openElement( 'fieldset' ) .
 514                         Html::element( 'legend', array(), wfMessage( 'config-db-install-account' )->text() ) .
 515                         $this->getTextBox( '_InstallUser', 'config-db-username', array( 'dir' => 'ltr' ), $this->parent->getHelpBox( 'config-db-install-username' ) ) .
 516                         $this->getPasswordBox( '_InstallPassword', 'config-db-password', array( 'dir' => 'ltr' ), $this->parent->getHelpBox( 'config-db-install-password' ) ) .
 517                         Html::closeElement( 'fieldset' );
 518         }
 519
 520         /**
 521          * Submit a standard install user fieldset.
 522          * @return Status
 523          */
 524         public function submitInstallUserBox() {
 525                 $this->setVarsFromRequest( array( '_InstallUser', '_InstallPassword' ) );
 526                 return Status::newGood();
 527         }
 528
 529         /**
 530          * Get a standard web-user fieldset
 531          * @param string $noCreateMsg Message to display instead of the creation checkbox.
 532          *   Set this to false to show a creation checkbox.
 533          *
 534          * @return String
 535          */
 536         public function getWebUserBox( $noCreateMsg = false ) {
 537                 $wrapperStyle = $this->getVar( '_SameAccount' ) ? 'display: none' : '';
 538                 $s = Html::openElement( 'fieldset' ) .
 539                         Html::element( 'legend', array(), wfMessage( 'config-db-web-account' )->text() ) .
 540                         $this->getCheckBox(
 541                                 '_SameAccount', 'config-db-web-account-same',
 542                                 array( 'class' => 'hideShowRadio', 'rel' => 'dbOtherAccount' )
 543                         ) .
 544                         Html::openElement( 'div', array( 'id' => 'dbOtherAccount', 'style' => $wrapperStyle ) ) .
 545                         $this->getTextBox( 'wgDBuser', 'config-db-username' ) .
 546                         $this->getPasswordBox( 'wgDBpassword', 'config-db-password' ) .
 547                         $this->parent->getHelpBox( 'config-db-web-help' );
 548                 if ( $noCreateMsg ) {
 549                         $s .= $this->parent->getWarningBox( wfMessage( $noCreateMsg )->plain() );
 550                 } else {
 551                         $s .= $this->getCheckBox( '_CreateDBAccount', 'config-db-web-create' );
 552                 }
 553                 $s .= Html::closeElement( 'div' ) . Html::closeElement( 'fieldset' );
 554                 return $s;
 555         }
 556
 557         /**
 558          * Submit the form from getWebUserBox().
 559          *
 560          * @return Status
 561          */
 562         public function submitWebUserBox() {
 563                 $this->setVarsFromRequest(
 564                         array( 'wgDBuser', 'wgDBpassword', '_SameAccount', '_CreateDBAccount' )
 565                 );
 566
 567                 if ( $this->getVar( '_SameAccount' ) ) {
 568                         $this->setVar( 'wgDBuser', $this->getVar( '_InstallUser' ) );
 569                         $this->setVar( 'wgDBpassword', $this->getVar( '_InstallPassword' ) );
 570                 }
 571
 572                 if ( $this->getVar( '_CreateDBAccount' ) && strval( $this->getVar( 'wgDBpassword' ) ) == '' ) {
 573                         return Status::newFatal( 'config-db-password-empty', $this->getVar( 'wgDBuser' ) );
 574                 }
 575
 576                 return Status::newGood();
 577         }
 578
 579         /**
 580          * Common function for databases that don't understand the MySQLish syntax of interwiki.sql.
 581          *
 582          * @return Status
 583          */
 584         public function populateInterwikiTable() {
 585                 $status = $this->getConnection();
 586                 if ( !$status->isOK() ) {
 587                         return $status;
 588                 }
 589                 $this->db->selectDB( $this->getVar( 'wgDBname' ) );
 590
 591                 if ( $this->db->selectRow( 'interwiki', '*', array(), __METHOD__ ) ) {
 592                         $status->warning( 'config-install-interwiki-exists' );
 593                         return $status;
 594                 }
 595                 global $IP;
 596                 wfSuppressWarnings();
 597                 $rows = file( "$IP/maintenance/interwiki.list",
 598                         FILE_IGNORE_NEW_LINES | FILE_SKIP_EMPTY_LINES );
 599                 wfRestoreWarnings();
 600                 $interwikis = array();
 601                 if ( !$rows ) {
 602                         return Status::newFatal( 'config-install-interwiki-list' );
 603                 }
 604                 foreach ( $rows as $row ) {
 605                         $row = preg_replace( '/^\s*([^#]*?)\s*(#.*)?$/', '\\1', $row ); // strip comments - whee
 606                         if ( $row == "" ) {
 607                                 continue;
 608                         }
 609                         $row .= "||";
 610                         $interwikis[] = array_combine(
 611                                 array( 'iw_prefix', 'iw_url', 'iw_local', 'iw_api', 'iw_wikiid' ),
 612                                 explode( '|', $row )
 613                         );
 614                 }
 615                 $this->db->insert( 'interwiki', $interwikis, __METHOD__ );
 616                 return Status::newGood();
 617         }
 618
 619         public function outputHandler( $string ) {
 620                 return htmlspecialchars( $string );
 621         }
 622 }