includes/installer/Installer.php

   1 <?php
   2 /**
   3  * Base code for MediaWiki installer.
   4  *
   5  * @file
   6  * @ingroup Deployment
   7  */
   8
   9 /**
  10  * This documentation group collects source code files with deployment functionality.
  11  *
  12  * @defgroup Deployment Deployment
  13  */
  14
  15 /**
  16  * Base installer class.
  17  *
  18  * This class provides the base for installation and update functionality
  19  * for both MediaWiki core and extensions.
  20  *
  21  * @ingroup Deployment
  22  * @since 1.17
  23  */
  24 abstract class Installer {
  25
  26         // This is the absolute minimum PHP version we can support
  27         const MINIMUM_PHP_VERSION = '5.2.3';
  28
  29         /**
  30          * @var array
  31          */
  32         protected $settings;
  33
  34         /**
  35          * Cached DB installer instances, access using getDBInstaller().
  36          *
  37          * @var array
  38          */
  39         protected $dbInstallers = array();
  40
  41         /**
  42          * Minimum memory size in MB.
  43          *
  44          * @var integer
  45          */
  46         protected $minMemorySize = 50;
  47
  48         /**
  49          * Cached Title, used by parse().
  50          *
  51          * @var Title
  52          */
  53         protected $parserTitle;
  54
  55         /**
  56          * Cached ParserOptions, used by parse().
  57          *
  58          * @var ParserOptions
  59          */
  60         protected $parserOptions;
  61
  62         /**
  63          * Known database types. These correspond to the class names <type>Installer,
  64          * and are also MediaWiki database types valid for $wgDBtype.
  65          *
  66          * To add a new type, create a <type>Installer class and a Database<type>
  67          * class, and add a config-type-<type> message to MessagesEn.php.
  68          *
  69          * @var array
  70          */
  71         protected static $dbTypes = array(
  72                 'mysql',
  73                 'postgres',
  74                 'oracle',
  75                 'sqlite',
  76                 'ibm_db2',
  77         );
  78
  79         /**
  80          * A list of environment check methods called by doEnvironmentChecks().
  81          * These may output warnings using showMessage(), and/or abort the
  82          * installation process by returning false.
  83          *
  84          * @var array
  85          */
  86         protected $envChecks = array(
  87                 'envCheckDB',
  88                 'envCheckRegisterGlobals',
  89                 'envCheckBrokenXML',
  90                 'envCheckPHP531',
  91                 'envCheckMagicQuotes',
  92                 'envCheckMagicSybase',
  93                 'envCheckMbstring',
  94                 'envCheckZE1',
  95                 'envCheckSafeMode',
  96                 'envCheckXML',
  97                 'envCheckPCRE',
  98                 'envCheckMemory',
  99                 'envCheckCache',
 100                 'envCheckModSecurity',
 101                 'envCheckDiff3',
 102                 'envCheckGraphics',
 103                 'envCheckServer',
 104                 'envCheckPath',
 105                 'envCheckExtension',
 106                 'envCheckShellLocale',
 107                 'envCheckUploadsDirectory',
 108                 'envCheckLibicu',
 109                 'envCheckSuhosinMaxValueLength',
 110                 'envCheckCtype',
 111         );
 112
 113         /**
 114          * MediaWiki configuration globals that will eventually be passed through
 115          * to LocalSettings.php. The names only are given here, the defaults
 116          * typically come from DefaultSettings.php.
 117          *
 118          * @var array
 119          */
 120         protected $defaultVarNames = array(
 121                 'wgSitename',
 122                 'wgPasswordSender',
 123                 'wgLanguageCode',
 124                 'wgRightsIcon',
 125                 'wgRightsText',
 126                 'wgRightsUrl',
 127                 'wgMainCacheType',
 128                 'wgEnableEmail',
 129                 'wgEnableUserEmail',
 130                 'wgEnotifUserTalk',
 131                 'wgEnotifWatchlist',
 132                 'wgEmailAuthentication',
 133                 'wgDBtype',
 134                 'wgDiff3',
 135                 'wgImageMagickConvertCommand',
 136                 'IP',
 137                 'wgServer',
 138                 'wgScriptPath',
 139                 'wgScriptExtension',
 140                 'wgMetaNamespace',
 141                 'wgDeletedDirectory',
 142                 'wgEnableUploads',
 143                 'wgLogo',
 144                 'wgShellLocale',
 145                 'wgSecretKey',
 146                 'wgUseInstantCommons',
 147                 'wgUpgradeKey',
 148                 'wgDefaultSkin',
 149                 'wgResourceLoaderMaxQueryLength',
 150         );
 151
 152         /**
 153          * Variables that are stored alongside globals, and are used for any
 154          * configuration of the installation process aside from the MediaWiki
 155          * configuration. Map of names to defaults.
 156          *
 157          * @var array
 158          */
 159         protected $internalDefaults = array(
 160                 '_UserLang' => 'en',
 161                 '_Environment' => false,
 162                 '_CompiledDBs' => array(),
 163                 '_SafeMode' => false,
 164                 '_RaiseMemory' => false,
 165                 '_UpgradeDone' => false,
 166                 '_InstallDone' => false,
 167                 '_Caches' => array(),
 168                 '_InstallPassword' => '',
 169                 '_SameAccount' => true,
 170                 '_CreateDBAccount' => false,
 171                 '_NamespaceType' => 'site-name',
 172                 '_AdminName' => '', // will be set later, when the user selects language
 173                 '_AdminPassword' => '',
 174                 '_AdminPassword2' => '',
 175                 '_AdminEmail' => '',
 176                 '_Subscribe' => false,
 177                 '_SkipOptional' => 'continue',
 178                 '_RightsProfile' => 'wiki',
 179                 '_LicenseCode' => 'none',
 180                 '_CCDone' => false,
 181                 '_Extensions' => array(),
 182                 '_MemCachedServers' => '',
 183                 '_UpgradeKeySupplied' => false,
 184                 '_ExistingDBSettings' => false,
 185         );
 186
 187         /**
 188          * The actual list of installation steps. This will be initialized by getInstallSteps()
 189          *
 190          * @var array
 191          */
 192         private $installSteps = array();
 193
 194         /**
 195          * Extra steps for installation, for things like DatabaseInstallers to modify
 196          *
 197          * @var array
 198          */
 199         protected $extraInstallSteps = array();
 200
 201         /**
 202          * Known object cache types and the functions used to test for their existence.
 203          *
 204          * @var array
 205          */
 206         protected $objectCaches = array(
 207                 'xcache' => 'xcache_get',
 208                 'apc' => 'apc_fetch',
 209                 'wincache' => 'wincache_ucache_get'
 210         );
 211
 212         /**
 213          * User rights profiles.
 214          *
 215          * @var array
 216          */
 217         public $rightsProfiles = array(
 218                 'wiki' => array(),
 219                 'no-anon' => array(
 220                         '*' => array( 'edit' => false )
 221                 ),
 222                 'fishbowl' => array(
 223                         '*' => array(
 224                                 'createaccount' => false,
 225                                 'edit' => false,
 226                         ),
 227                 ),
 228                 'private' => array(
 229                         '*' => array(
 230                                 'createaccount' => false,
 231                                 'edit' => false,
 232                                 'read' => false,
 233                         ),
 234                 ),
 235         );
 236
 237         /**
 238          * License types.
 239          *
 240          * @var array
 241          */
 242         public $licenses = array(
 243                 'cc-by' => array(
 244                         'url' => 'http://creativecommons.org/licenses/by/3.0/',
 245                         'icon' => '{$wgStylePath}/common/images/cc-by.png',
 246                 ),
 247                 'cc-by-sa' => array(
 248                         'url' => 'http://creativecommons.org/licenses/by-sa/3.0/',
 249                         'icon' => '{$wgStylePath}/common/images/cc-by-sa.png',
 250                 ),
 251                 'cc-by-nc-sa' => array(
 252                         'url' => 'http://creativecommons.org/licenses/by-nc-sa/3.0/',
 253                         'icon' => '{$wgStylePath}/common/images/cc-by-nc-sa.png',
 254                 ),
 255                 'cc-0' => array(
 256                         'url' => 'https://creativecommons.org/publicdomain/zero/1.0/',
 257                         'icon' => '{$wgStylePath}/common/images/cc-0.png',
 258                 ),
 259                 'pd' => array(
 260                         'url' => '',
 261                         'icon' => '{$wgStylePath}/common/images/public-domain.png',
 262                 ),
 263                 'gfdl' => array(
 264                         'url' => 'http://www.gnu.org/copyleft/fdl.html',
 265                         'icon' => '{$wgStylePath}/common/images/gnu-fdl.png',
 266                 ),
 267                 'none' => array(
 268                         'url' => '',
 269                         'icon' => '',
 270                         'text' => ''
 271                 ),
 272                 'cc-choose' => array(
 273                         // Details will be filled in by the selector.
 274                         'url' => '',
 275                         'icon' => '',
 276                         'text' => '',
 277                 ),
 278         );
 279
 280         /**
 281          * URL to mediawiki-announce subscription
 282          */
 283         protected $mediaWikiAnnounceUrl = 'https://lists.wikimedia.org/mailman/subscribe/mediawiki-announce';
 284
 285         /**
 286          * Supported language codes for Mailman
 287          */
 288         protected $mediaWikiAnnounceLanguages = array(
 289                 'ca', 'cs', 'da', 'de', 'en', 'es', 'et', 'eu', 'fi', 'fr', 'hr', 'hu',
 290                 'it', 'ja', 'ko', 'lt', 'nl', 'no', 'pl', 'pt', 'pt-br', 'ro', 'ru',
 291                 'sl', 'sr', 'sv', 'tr', 'uk'
 292         );
 293
 294         /**
 295          * UI interface for displaying a short message
 296          * The parameters are like parameters to wfMsg().
 297          * The messages will be in wikitext format, which will be converted to an
 298          * output format such as HTML or text before being sent to the user.
 299          * @param $msg
 300          */
 301         public abstract function showMessage( $msg /*, ... */ );
 302
 303         /**
 304          * Same as showMessage(), but for displaying errors
 305          * @param $msg
 306          */
 307         public abstract function showError( $msg /*, ... */ );
 308
 309         /**
 310          * Show a message to the installing user by using a Status object
 311          * @param $status Status
 312          */
 313         public abstract function showStatusMessage( Status $status );
 314
 315         /**
 316          * Constructor, always call this from child classes.
 317          */
 318         public function __construct() {
 319                 global $wgExtensionMessagesFiles, $wgUser;
 320
 321                 // Disable the i18n cache and LoadBalancer
 322                 Language::getLocalisationCache()->disableBackend();
 323                 LBFactory::disableBackend();
 324
 325                 // Load the installer's i18n file.
 326                 $wgExtensionMessagesFiles['MediawikiInstaller'] =
 327                         dirname( __FILE__ ) . '/Installer.i18n.php';
 328
 329                 // Having a user with id = 0 safeguards us from DB access via User::loadOptions().
 330                 $wgUser = User::newFromId( 0 );
 331
 332                 $this->settings = $this->internalDefaults;
 333
 334                 foreach ( $this->defaultVarNames as $var ) {
 335                         $this->settings[$var] = $GLOBALS[$var];
 336                 }
 337
 338                 $compiledDBs = array();
 339                 foreach ( self::getDBTypes() as $type ) {
 340                         $installer = $this->getDBInstaller( $type );
 341
 342                         if ( !$installer->isCompiled() ) {
 343                                 continue;
 344                         }
 345                         $compiledDBs[] = $type;
 346
 347                         $defaults = $installer->getGlobalDefaults();
 348
 349                         foreach ( $installer->getGlobalNames() as $var ) {
 350                                 if ( isset( $defaults[$var] ) ) {
 351                                         $this->settings[$var] = $defaults[$var];
 352                                 } else {
 353                                         $this->settings[$var] = $GLOBALS[$var];
 354                                 }
 355                         }
 356                 }
 357                 $this->setVar( '_CompiledDBs', $compiledDBs );
 358
 359                 $this->parserTitle = Title::newFromText( 'Installer' );
 360                 $this->parserOptions = new ParserOptions; // language will  be wrong :(
 361                 $this->parserOptions->setEditSection( false );
 362         }
 363
 364         /**
 365          * Get a list of known DB types.
 366          *
 367          * @return array
 368          */
 369         public static function getDBTypes() {
 370                 return self::$dbTypes;
 371         }
 372
 373         /**
 374          * Do initial checks of the PHP environment. Set variables according to
 375          * the observed environment.
 376          *
 377          * It's possible that this may be called under the CLI SAPI, not the SAPI
 378          * that the wiki will primarily run under. In that case, the subclass should
 379          * initialise variables such as wgScriptPath, before calling this function.
 380          *
 381          * Under the web subclass, it can already be assumed that PHP 5+ is in use
 382          * and that sessions are working.
 383          *
 384          * @return Status
 385          */
 386         public function doEnvironmentChecks() {
 387                 $phpVersion = phpversion();
 388                 if( version_compare( $phpVersion, self::MINIMUM_PHP_VERSION, '>=' ) ) {
 389                         $this->showMessage( 'config-env-php', $phpVersion );
 390                         $good = true;
 391                 } else {
 392                         $this->showMessage( 'config-env-php-toolow', $phpVersion, self::MINIMUM_PHP_VERSION );
 393                         $good = false;
 394                 }
 395
 396                 if( $good ) {
 397                         foreach ( $this->envChecks as $check ) {
 398                                 $status = $this->$check();
 399                                 if ( $status === false ) {
 400                                         $good = false;
 401                                 }
 402                         }
 403                 }
 404
 405                 $this->setVar( '_Environment', $good );
 406
 407                 return $good ? Status::newGood() : Status::newFatal( 'config-env-bad' );
 408         }
 409
 410         /**
 411          * Set a MW configuration variable, or internal installer configuration variable.
 412          *
 413          * @param $name String
 414          * @param $value Mixed
 415          */
 416         public function setVar( $name, $value ) {
 417                 $this->settings[$name] = $value;
 418         }
 419
 420         /**
 421          * Get an MW configuration variable, or internal installer configuration variable.
 422          * The defaults come from $GLOBALS (ultimately DefaultSettings.php).
 423          * Installer variables are typically prefixed by an underscore.
 424          *
 425          * @param $name String
 426          * @param $default Mixed
 427          *
 428          * @return mixed
 429          */
 430         public function getVar( $name, $default = null ) {
 431                 if ( !isset( $this->settings[$name] ) ) {
 432                         return $default;
 433                 } else {
 434                         return $this->settings[$name];
 435                 }
 436         }
 437
 438         /**
 439          * Get an instance of DatabaseInstaller for the specified DB type.
 440          *
 441          * @param $type Mixed: DB installer for which is needed, false to use default.
 442          *
 443          * @return DatabaseInstaller
 444          */
 445         public function getDBInstaller( $type = false ) {
 446                 if ( !$type ) {
 447                         $type = $this->getVar( 'wgDBtype' );
 448                 }
 449
 450                 $type = strtolower( $type );
 451
 452                 if ( !isset( $this->dbInstallers[$type] ) ) {
 453                         $class = ucfirst( $type ). 'Installer';
 454                         $this->dbInstallers[$type] = new $class( $this );
 455                 }
 456
 457                 return $this->dbInstallers[$type];
 458         }
 459
 460         /**
 461          * Determine if LocalSettings.php exists. If it does, return its variables,
 462          * merged with those from AdminSettings.php, as an array.
 463          *
 464          * @return Array
 465          */
 466         public static function getExistingLocalSettings() {
 467                 global $IP;
 468
 469                 wfSuppressWarnings();
 470                 $_lsExists = file_exists( "$IP/LocalSettings.php" );
 471                 wfRestoreWarnings();
 472
 473                 if( !$_lsExists ) {
 474                         return false;
 475                 }
 476                 unset($_lsExists);
 477
 478                 require( "$IP/includes/DefaultSettings.php" );
 479                 require( "$IP/LocalSettings.php" );
 480                 if ( file_exists( "$IP/AdminSettings.php" ) ) {
 481                         require( "$IP/AdminSettings.php" );
 482                 }
 483                 return get_defined_vars();
 484         }
 485
 486         /**
 487          * Get a fake password for sending back to the user in HTML.
 488          * This is a security mechanism to avoid compromise of the password in the
 489          * event of session ID compromise.
 490          *
 491          * @param $realPassword String
 492          *
 493          * @return string
 494          */
 495         public function getFakePassword( $realPassword ) {
 496                 return str_repeat( '*', strlen( $realPassword ) );
 497         }
 498
 499         /**
 500          * Set a variable which stores a password, except if the new value is a
 501          * fake password in which case leave it as it is.
 502          *
 503          * @param $name String
 504          * @param $value Mixed
 505          */
 506         public function setPassword( $name, $value ) {
 507                 if ( !preg_match( '/^\*+$/', $value ) ) {
 508                         $this->setVar( $name, $value );
 509                 }
 510         }
 511
 512         /**
 513          * On POSIX systems return the primary group of the webserver we're running under.
 514          * On other systems just returns null.
 515          *
 516          * This is used to advice the user that he should chgrp his mw-config/data/images directory as the
 517          * webserver user before he can install.
 518          *
 519          * Public because SqliteInstaller needs it, and doesn't subclass Installer.
 520          *
 521          * @return mixed
 522          */
 523         public static function maybeGetWebserverPrimaryGroup() {
 524                 if ( !function_exists( 'posix_getegid' ) || !function_exists( 'posix_getpwuid' ) ) {
 525                         # I don't know this, this isn't UNIX.
 526                         return null;
 527                 }
 528
 529                 # posix_getegid() *not* getmygid() because we want the group of the webserver,
 530                 # not whoever owns the current script.
 531                 $gid = posix_getegid();
 532                 $getpwuid = posix_getpwuid( $gid );
 533                 $group = $getpwuid['name'];
 534
 535                 return $group;
 536         }
 537
 538         /**
 539          * Convert wikitext $text to HTML.
 540          *
 541          * This is potentially error prone since many parser features require a complete
 542          * installed MW database. The solution is to just not use those features when you
 543          * write your messages. This appears to work well enough. Basic formatting and
 544          * external links work just fine.
 545          *
 546          * But in case a translator decides to throw in a #ifexist or internal link or
 547          * whatever, this function is guarded to catch the attempted DB access and to present
 548          * some fallback text.
 549          *
 550          * @param $text String
 551          * @param $lineStart Boolean
 552          * @return String
 553          */
 554         public function parse( $text, $lineStart = false ) {
 555                 global $wgParser;
 556
 557                 try {
 558                         $out = $wgParser->parse( $text, $this->parserTitle, $this->parserOptions, $lineStart );
 559                         $html = $out->getText();
 560                 } catch ( DBAccessError $e ) {
 561                         $html = '<!--DB access attempted during parse-->  ' . htmlspecialchars( $text );
 562
 563                         if ( !empty( $this->debug ) ) {
 564                                 $html .= "<!--\n" . $e->getTraceAsString() . "\n-->";
 565                         }
 566                 }
 567
 568                 return $html;
 569         }
 570
 571         /**
 572          * @return ParserOptions
 573          */
 574         public function getParserOptions() {
 575                 return $this->parserOptions;
 576         }
 577
 578         public function disableLinkPopups() {
 579                 $this->parserOptions->setExternalLinkTarget( false );
 580         }
 581
 582         public function restoreLinkPopups() {
 583                 global $wgExternalLinkTarget;
 584                 $this->parserOptions->setExternalLinkTarget( $wgExternalLinkTarget );
 585         }
 586
 587         /**
 588          * Install step which adds a row to the site_stats table with appropriate
 589          * initial values.
 590          *
 591          * @param $installer DatabaseInstaller
 592          *
 593          * @return Status
 594          */
 595         public function populateSiteStats( DatabaseInstaller $installer ) {
 596                 $status = $installer->getConnection();
 597                 if ( !$status->isOK() ) {
 598                         return $status;
 599                 }
 600                 $status->value->insert( 'site_stats', array(
 601                         'ss_row_id' => 1,
 602                         'ss_total_views' => 0,
 603                         'ss_total_edits' => 0,
 604                         'ss_good_articles' => 0,
 605                         'ss_total_pages' => 0,
 606                         'ss_users' => 0,
 607                         'ss_images' => 0 ),
 608                         __METHOD__, 'IGNORE' );
 609                 return Status::newGood();
 610         }
 611
 612         /**
 613          * Exports all wg* variables stored by the installer into global scope.
 614          */
 615         public function exportVars() {
 616                 foreach ( $this->settings as $name => $value ) {
 617                         if ( substr( $name, 0, 2 ) == 'wg' ) {
 618                                 $GLOBALS[$name] = $value;
 619                         }
 620                 }
 621         }
 622
 623         /**
 624          * Environment check for DB types.
 625          * @return bool
 626          */
 627         protected function envCheckDB() {
 628                 global $wgLang;
 629
 630                 $allNames = array();
 631
 632                 foreach ( self::getDBTypes() as $name ) {
 633                         $allNames[] = wfMsg( "config-type-$name" );
 634                 }
 635
 636                 // cache initially available databases to make sure that everything will be displayed correctly
 637                 // after a refresh on env checks page
 638                 $databases = $this->getVar( '_CompiledDBs-preFilter' );
 639                 if ( !$databases ) {
 640                         $databases = $this->getVar( '_CompiledDBs' );
 641                         $this->setVar( '_CompiledDBs-preFilter', $databases );
 642                 }
 643
 644                 $databases = array_flip ( $databases );
 645                 foreach ( array_keys( $databases ) as $db ) {
 646                         $installer = $this->getDBInstaller( $db );
 647                         $status = $installer->checkPrerequisites();
 648                         if ( !$status->isGood() ) {
 649                                 $this->showStatusMessage( $status );
 650                         }
 651                         if ( !$status->isOK() ) {
 652                                 unset( $databases[$db] );
 653                         }
 654                 }
 655                 $databases = array_flip( $databases );
 656                 if ( !$databases ) {
 657                         $this->showError( 'config-no-db', $wgLang->commaList( $allNames ) );
 658                         // @todo FIXME: This only works for the web installer!
 659                         return false;
 660                 }
 661                 $this->setVar( '_CompiledDBs', $databases );
 662                 return true;
 663         }
 664
 665         /**
 666          * Environment check for register_globals.
 667          */
 668         protected function envCheckRegisterGlobals() {
 669                 if( wfIniGetBool( 'register_globals' ) ) {
 670                         $this->showMessage( 'config-register-globals' );
 671                 }
 672         }
 673
 674         /**
 675          * Some versions of libxml+PHP break < and > encoding horribly
 676          * @return bool
 677          */
 678         protected function envCheckBrokenXML() {
 679                 $test = new PhpXmlBugTester();
 680                 if ( !$test->ok ) {
 681                         $this->showError( 'config-brokenlibxml' );
 682                         return false;
 683                 }
 684                 return true;
 685         }
 686
 687         /**
 688          * Test PHP (probably 5.3.1, but it could regress again) to make sure that
 689          * reference parameters to __call() are not converted to null
 690          * @return bool
 691          */
 692         protected function envCheckPHP531() {
 693                 $test = new PhpRefCallBugTester;
 694                 $test->execute();
 695                 if ( !$test->ok ) {
 696                         $this->showError( 'config-using531', phpversion() );
 697                         return false;
 698                 }
 699                 return true;
 700         }
 701
 702         /**
 703          * Environment check for magic_quotes_runtime.
 704          * @return bool
 705          */
 706         protected function envCheckMagicQuotes() {
 707                 if( wfIniGetBool( "magic_quotes_runtime" ) ) {
 708                         $this->showError( 'config-magic-quotes-runtime' );
 709                         return false;
 710                 }
 711                 return true;
 712         }
 713
 714         /**
 715          * Environment check for magic_quotes_sybase.
 716          * @return bool
 717          */
 718         protected function envCheckMagicSybase() {
 719                 if ( wfIniGetBool( 'magic_quotes_sybase' ) ) {
 720                         $this->showError( 'config-magic-quotes-sybase' );
 721                         return false;
 722                 }
 723                 return true;
 724         }
 725
 726         /**
 727          * Environment check for mbstring.func_overload.
 728          * @return bool
 729          */
 730         protected function envCheckMbstring() {
 731                 if ( wfIniGetBool( 'mbstring.func_overload' ) ) {
 732                         $this->showError( 'config-mbstring' );
 733                         return false;
 734                 }
 735                 return true;
 736         }
 737
 738         /**
 739          * Environment check for zend.ze1_compatibility_mode.
 740          * @return bool
 741          */
 742         protected function envCheckZE1() {
 743                 if ( wfIniGetBool( 'zend.ze1_compatibility_mode' ) ) {
 744                         $this->showError( 'config-ze1' );
 745                         return false;
 746                 }
 747                 return true;
 748         }
 749
 750         /**
 751          * Environment check for safe_mode.
 752          * @return bool
 753          */
 754         protected function envCheckSafeMode() {
 755                 if ( wfIniGetBool( 'safe_mode' ) ) {
 756                         $this->setVar( '_SafeMode', true );
 757                         $this->showMessage( 'config-safe-mode' );
 758                 }
 759                 return true;
 760         }
 761
 762         /**
 763          * Environment check for the XML module.
 764          * @return bool
 765          */
 766         protected function envCheckXML() {
 767                 if ( !function_exists( "utf8_encode" ) ) {
 768                         $this->showError( 'config-xml-bad' );
 769                         return false;
 770                 }
 771                 return true;
 772         }
 773
 774         /**
 775          * Environment check for the PCRE module.
 776          * @return bool
 777          */
 778         protected function envCheckPCRE() {
 779                 if ( !function_exists( 'preg_match' ) ) {
 780                         $this->showError( 'config-pcre' );
 781                         return false;
 782                 }
 783                 wfSuppressWarnings();
 784                 $regexd = preg_replace( '/[\x{0430}-\x{04FF}]/iu', '', '-АБВГД-' );
 785                 wfRestoreWarnings();
 786                 if ( $regexd != '--' ) {
 787                         $this->showError( 'config-pcre-no-utf8' );
 788                         return false;
 789                 }
 790                 return true;
 791         }
 792
 793         /**
 794          * Environment check for available memory.
 795          * @return bool
 796          */
 797         protected function envCheckMemory() {
 798                 $limit = ini_get( 'memory_limit' );
 799
 800                 if ( !$limit || $limit == -1 ) {
 801                         return true;
 802                 }
 803
 804                 $n = wfShorthandToInteger( $limit );
 805
 806                 if( $n < $this->minMemorySize * 1024 * 1024 ) {
 807                         $newLimit = "{$this->minMemorySize}M";
 808
 809                         if( ini_set( "memory_limit", $newLimit ) === false ) {
 810                                 $this->showMessage( 'config-memory-bad', $limit );
 811                         } else {
 812                                 $this->showMessage( 'config-memory-raised', $limit, $newLimit );
 813                                 $this->setVar( '_RaiseMemory', true );
 814                         }
 815                 }
 816                 return true;
 817         }
 818
 819         /**
 820          * Environment check for compiled object cache types.
 821          */
 822         protected function envCheckCache() {
 823                 $caches = array();
 824                 foreach ( $this->objectCaches as $name => $function ) {
 825                         if ( function_exists( $function ) ) {
 826                                 if ( $name == 'xcache' && !wfIniGetBool( 'xcache.var_size' ) ) {
 827                                         continue;
 828                                 }
 829                                 $caches[$name] = true;
 830                         }
 831                 }
 832
 833                 if ( !$caches ) {
 834                         $this->showMessage( 'config-no-cache' );
 835                 }
 836
 837                 $this->setVar( '_Caches', $caches );
 838         }
 839
 840         /**
 841          * Scare user to death if they have mod_security
 842          * @return bool
 843          */
 844         protected function envCheckModSecurity() {
 845                 if ( self::apacheModulePresent( 'mod_security' ) ) {
 846                         $this->showMessage( 'config-mod-security' );
 847                 }
 848                 return true;
 849         }
 850
 851         /**
 852          * Search for GNU diff3.
 853          * @return bool
 854          */
 855         protected function envCheckDiff3() {
 856                 $names = array( "gdiff3", "diff3", "diff3.exe" );
 857                 $versionInfo = array( '$1 --version 2>&1', 'GNU diffutils' );
 858
 859                 $diff3 = self::locateExecutableInDefaultPaths( $names, $versionInfo );
 860
 861                 if ( $diff3 ) {
 862                         $this->setVar( 'wgDiff3', $diff3 );
 863                 } else {
 864                         $this->setVar( 'wgDiff3', false );
 865                         $this->showMessage( 'config-diff3-bad' );
 866                 }
 867                 return true;
 868         }
 869
 870         /**
 871          * Environment check for ImageMagick and GD.
 872          * @return bool
 873          */
 874         protected function envCheckGraphics() {
 875                 $names = array( wfIsWindows() ? 'convert.exe' : 'convert' );
 876                 $convert = self::locateExecutableInDefaultPaths( $names, array( '$1 -version', 'ImageMagick' ) );
 877
 878                 $this->setVar( 'wgImageMagickConvertCommand', '' );
 879                 if ( $convert ) {
 880                         $this->setVar( 'wgImageMagickConvertCommand', $convert );
 881                         $this->showMessage( 'config-imagemagick', $convert );
 882                         return true;
 883                 } elseif ( function_exists( 'imagejpeg' ) ) {
 884                         $this->showMessage( 'config-gd' );
 885
 886                 } else {
 887                         $this->showMessage( 'config-no-scaling' );
 888                 }
 889                 return true;
 890         }
 891
 892         /**
 893          * Environment check for the server hostname.
 894          */
 895         protected function envCheckServer() {
 896                 $server = $this->envGetDefaultServer();
 897                 $this->showMessage( 'config-using-server', $server );
 898                 $this->setVar( 'wgServer', $server );
 899                 return true;
 900         }
 901
 902         /**
 903          * Helper function to be called from envCheckServer()
 904          * @return String
 905          */
 906         protected abstract function envGetDefaultServer();
 907
 908         /**
 909          * Environment check for setting $IP and $wgScriptPath.
 910          * @return bool
 911          */
 912         protected function envCheckPath() {
 913                 global $IP;
 914                 $IP = dirname( dirname( dirname( __FILE__ ) ) );
 915                 $this->setVar( 'IP', $IP );
 916
 917                 $this->showMessage( 'config-using-uri', $this->getVar( 'wgServer' ), $this->getVar( 'wgScriptPath' ) );
 918                 return true;
 919         }
 920
 921         /**
 922          * Environment check for setting the preferred PHP file extension.
 923          */
 924         protected function envCheckExtension() {
 925                 // @todo FIXME: Detect this properly
 926                 if ( defined( 'MW_INSTALL_PHP5_EXT' ) ) {
 927                         $ext = 'php5';
 928                 } else {
 929                         $ext = 'php';
 930                 }
 931                 $this->setVar( 'wgScriptExtension', ".$ext" );
 932                 return true;
 933         }
 934
 935         /**
 936          * TODO: document
 937          * @return bool
 938          */
 939         protected function envCheckShellLocale() {
 940                 $os = php_uname( 's' );
 941                 $supported = array( 'Linux', 'SunOS', 'HP-UX', 'Darwin' ); # Tested these
 942
 943                 if ( !in_array( $os, $supported ) ) {
 944                         return true;
 945                 }
 946
 947                 # Get a list of available locales.
 948                 $ret = false;
 949                 $lines = wfShellExec( '/usr/bin/locale -a', $ret );
 950
 951                 if ( $ret ) {
 952                         return true;
 953                 }
 954
 955                 $lines = wfArrayMap( 'trim', explode( "\n", $lines ) );
 956                 $candidatesByLocale = array();
 957                 $candidatesByLang = array();
 958
 959                 foreach ( $lines as $line ) {
 960                         if ( $line === '' ) {
 961                                 continue;
 962                         }
 963
 964                         if ( !preg_match( '/^([a-zA-Z]+)(_[a-zA-Z]+|)\.(utf8|UTF-8)(@[a-zA-Z_]*|)$/i', $line, $m ) ) {
 965                                 continue;
 966                         }
 967
 968                         list( $all, $lang, $territory, $charset, $modifier ) = $m;
 969
 970                         $candidatesByLocale[$m[0]] = $m;
 971                         $candidatesByLang[$lang][] = $m;
 972                 }
 973
 974                 # Try the current value of LANG.
 975                 if ( isset( $candidatesByLocale[ getenv( 'LANG' ) ] ) ) {
 976                         $this->setVar( 'wgShellLocale', getenv( 'LANG' ) );
 977                         return true;
 978                 }
 979
 980                 # Try the most common ones.
 981                 $commonLocales = array( 'en_US.UTF-8', 'en_US.utf8', 'de_DE.UTF-8', 'de_DE.utf8' );
 982                 foreach ( $commonLocales as $commonLocale ) {
 983                         if ( isset( $candidatesByLocale[$commonLocale] ) ) {
 984                                 $this->setVar( 'wgShellLocale', $commonLocale );
 985                                 return true;
 986                         }
 987                 }
 988
 989                 # Is there an available locale in the Wiki's language?
 990                 $wikiLang = $this->getVar( 'wgLanguageCode' );
 991
 992                 if ( isset( $candidatesByLang[$wikiLang] ) ) {
 993                         $m = reset( $candidatesByLang[$wikiLang] );
 994                         $this->setVar( 'wgShellLocale', $m[0] );
 995                         return true;
 996                 }
 997
 998                 # Are there any at all?
 999                 if ( count( $candidatesByLocale ) ) {
1000                         $m = reset( $candidatesByLocale );
1001                         $this->setVar( 'wgShellLocale', $m[0] );
1002                         return true;
1003                 }
1004
1005                 # Give up.
1006                 return true;
1007         }
1008
1009         /**
1010          * TODO: document
1011          * @return bool
1012          */
1013         protected function envCheckUploadsDirectory() {
1014                 global $IP;
1015
1016                 $dir = $IP . '/images/';
1017                 $url = $this->getVar( 'wgServer' ) . $this->getVar( 'wgScriptPath' ) . '/images/';
1018                 $safe = !$this->dirIsExecutable( $dir, $url );
1019
1020                 if ( !$safe ) {
1021                         $this->showMessage( 'config-uploads-not-safe', $dir );
1022                 }
1023                 return true;
1024         }
1025
1026         /**
1027          * Checks if suhosin.get.max_value_length is set, and if so, sets
1028          * $wgResourceLoaderMaxQueryLength to that value in the generated
1029          * LocalSettings file
1030          * @return bool
1031          */
1032         protected function envCheckSuhosinMaxValueLength() {
1033                 $maxValueLength = ini_get( 'suhosin.get.max_value_length' );
1034                 if ( $maxValueLength > 0 ) {
1035                         if( $maxValueLength < 1024 ) {
1036                                 # Only warn if the value is below the sane 1024
1037                                 $this->showMessage( 'config-suhosin-max-value-length', $maxValueLength );
1038                         }
1039                 } else {
1040                         $maxValueLength = -1;
1041                 }
1042                 $this->setVar( 'wgResourceLoaderMaxQueryLength', $maxValueLength );
1043                 return true;
1044         }
1045
1046         /**
1047          * Convert a hex string representing a Unicode code point to that code point.
1048          * @param $c String
1049          * @return string
1050          */
1051         protected function unicodeChar( $c ) {
1052                 $c = hexdec($c);
1053                 if ($c <= 0x7F) {
1054                         return chr($c);
1055                 } elseif ($c <= 0x7FF) {
1056                         return chr(0xC0 | $c >> 6) . chr(0x80 | $c & 0x3F);
1057                 } elseif ($c <= 0xFFFF) {
1058                         return chr(0xE0 | $c >> 12) . chr(0x80 | $c >> 6 & 0x3F)
1059                                 . chr(0x80 | $c & 0x3F);
1060                 } elseif ($c <= 0x10FFFF) {
1061                         return chr(0xF0 | $c >> 18) . chr(0x80 | $c >> 12 & 0x3F)
1062                                 . chr(0x80 | $c >> 6 & 0x3F)
1063                                 . chr(0x80 | $c & 0x3F);
1064                 } else {
1065                         return false;
1066                 }
1067         }
1068
1069
1070         /**
1071          * Check the libicu version
1072          */
1073         protected function envCheckLibicu() {
1074                 $utf8 = function_exists( 'utf8_normalize' );
1075                 $intl = function_exists( 'normalizer_normalize' );
1076
1077                 /**
1078                  * This needs to be updated something that the latest libicu
1079                  * will properly normalize.  This normalization was found at
1080                  * http://www.unicode.org/versions/Unicode5.2.0/#Character_Additions
1081                  * Note that we use the hex representation to create the code
1082                  * points in order to avoid any Unicode-destroying during transit.
1083                  */
1084                 $not_normal_c = $this->unicodeChar("FA6C");
1085                 $normal_c = $this->unicodeChar("242EE");
1086
1087                 $useNormalizer = 'php';
1088                 $needsUpdate = false;
1089
1090                 /**
1091                  * We're going to prefer the pecl extension here unless
1092                  * utf8_normalize is more up to date.
1093                  */
1094                 if( $utf8 ) {
1095                         $useNormalizer = 'utf8';
1096                         $utf8 = utf8_normalize( $not_normal_c, UtfNormal::UNORM_NFC );
1097                         if ( $utf8 !== $normal_c ) $needsUpdate = true;
1098                 }
1099                 if( $intl ) {
1100                         $useNormalizer = 'intl';
1101                         $intl = normalizer_normalize( $not_normal_c, Normalizer::FORM_C );
1102                         if ( $intl !== $normal_c ) $needsUpdate = true;
1103                 }
1104
1105                 // Uses messages 'config-unicode-using-php', 'config-unicode-using-utf8', 'config-unicode-using-intl'
1106                 if( $useNormalizer === 'php' ) {
1107                         $this->showMessage( 'config-unicode-pure-php-warning' );
1108                 } else {
1109                         $this->showMessage( 'config-unicode-using-' . $useNormalizer );
1110                         if( $needsUpdate ) {
1111                                 $this->showMessage( 'config-unicode-update-warning' );
1112                         }
1113                 }
1114         }
1115
1116         /**
1117          * @return bool
1118          */
1119         protected function envCheckCtype() {
1120                 if ( !function_exists( 'ctype_digit' ) ) {
1121                         $this->showError( 'config-ctype' );
1122                         return false;
1123                 }
1124                 return true;
1125         }
1126
1127         /**
1128          * Get an array of likely places we can find executables. Check a bunch
1129          * of known Unix-like defaults, as well as the PATH environment variable
1130          * (which should maybe make it work for Windows?)
1131          *
1132          * @return Array
1133          */
1134         protected static function getPossibleBinPaths() {
1135                 return array_merge(
1136                         array( '/usr/bin', '/usr/local/bin', '/opt/csw/bin',
1137                                 '/usr/gnu/bin', '/usr/sfw/bin', '/sw/bin', '/opt/local/bin' ),
1138                         explode( PATH_SEPARATOR, getenv( 'PATH' ) )
1139                 );
1140         }
1141
1142         /**
1143          * Search a path for any of the given executable names. Returns the
1144          * executable name if found. Also checks the version string returned
1145          * by each executable.
1146          *
1147          * Used only by environment checks.
1148          *
1149          * @param $path String: path to search
1150          * @param $names Array of executable names
1151          * @param $versionInfo Boolean false or array with two members:
1152          *               0 => Command to run for version check, with $1 for the full executable name
1153          *               1 => String to compare the output with
1154          *
1155          * If $versionInfo is not false, only executables with a version
1156          * matching $versionInfo[1] will be returned.
1157          * @return bool|string
1158          */
1159         public static function locateExecutable( $path, $names, $versionInfo = false ) {
1160                 if ( !is_array( $names ) ) {
1161                         $names = array( $names );
1162                 }
1163
1164                 foreach ( $names as $name ) {
1165                         $command = $path . DIRECTORY_SEPARATOR . $name;
1166
1167                         wfSuppressWarnings();
1168                         $file_exists = file_exists( $command );
1169                         wfRestoreWarnings();
1170
1171                         if ( $file_exists ) {
1172                                 if ( !$versionInfo ) {
1173                                         return $command;
1174                                 }
1175
1176                                 $file = str_replace( '$1', wfEscapeShellArg( $command ), $versionInfo[0] );
1177                                 if ( strstr( wfShellExec( $file ), $versionInfo[1] ) !== false ) {
1178                                         return $command;
1179                                 }
1180                         }
1181                 }
1182                 return false;
1183         }
1184
1185         /**
1186          * Same as locateExecutable(), but checks in getPossibleBinPaths() by default
1187          * @see locateExecutable()
1188          * @param $names
1189          * @param $versionInfo bool
1190          * @return bool|string
1191          */
1192         public static function locateExecutableInDefaultPaths( $names, $versionInfo = false ) {
1193                 foreach( self::getPossibleBinPaths() as $path ) {
1194                         $exe = self::locateExecutable( $path, $names, $versionInfo );
1195                         if( $exe !== false ) {
1196                                 return $exe;
1197                         }
1198                 }
1199                 return false;
1200         }
1201
1202         /**
1203          * Checks if scripts located in the given directory can be executed via the given URL.
1204          *
1205          * Used only by environment checks.
1206          * @param $dir string
1207          * @param $url string
1208          * @return bool|int|string
1209          */
1210         public function dirIsExecutable( $dir, $url ) {
1211                 $scriptTypes = array(
1212                         'php' => array(
1213                                 "<?php echo 'ex' . 'ec';",
1214                                 "#!/var/env php5\n<?php echo 'ex' . 'ec';",
1215                         ),
1216                 );
1217
1218                 // it would be good to check other popular languages here, but it'll be slow.
1219
1220                 wfSuppressWarnings();
1221
1222                 foreach ( $scriptTypes as $ext => $contents ) {
1223                         foreach ( $contents as $source ) {
1224                                 $file = 'exectest.' . $ext;
1225
1226                                 if ( !file_put_contents( $dir . $file, $source ) ) {
1227                                         break;
1228                                 }
1229
1230                                 try {
1231                                         $text = Http::get( $url . $file, array( 'timeout' => 3 ) );
1232                                 }
1233                                 catch( MWException $e ) {
1234                                         // Http::get throws with allow_url_fopen = false and no curl extension.
1235                                         $text = null;
1236                                 }
1237                                 unlink( $dir . $file );
1238
1239                                 if ( $text == 'exec' ) {
1240                                         wfRestoreWarnings();
1241                                         return $ext;
1242                                 }
1243                         }
1244                 }
1245
1246                 wfRestoreWarnings();
1247
1248                 return false;
1249         }
1250
1251         /**
1252          * Checks for presence of an Apache module. Works only if PHP is running as an Apache module, too.
1253          *
1254          * @param $moduleName String: Name of module to check.
1255          * @return bool
1256          */
1257         public static function apacheModulePresent( $moduleName ) {
1258                 if ( function_exists( 'apache_get_modules' ) && in_array( $moduleName, apache_get_modules() ) ) {
1259                         return true;
1260                 }
1261                 // try it the hard way
1262                 ob_start();
1263                 phpinfo( INFO_MODULES );
1264                 $info = ob_get_clean();
1265                 return strpos( $info, $moduleName ) !== false;
1266         }
1267
1268         /**
1269          * ParserOptions are constructed before we determined the language, so fix it
1270          *
1271          * @param $lang Language
1272          */
1273         public function setParserLanguage( $lang ) {
1274                 $this->parserOptions->setTargetLanguage( $lang );
1275                 $this->parserOptions->setUserLang( $lang );
1276         }
1277
1278         /**
1279          * Overridden by WebInstaller to provide lastPage parameters.
1280          * @param $page string
1281          * @return string
1282          */
1283         protected function getDocUrl( $page ) {
1284                 return "{$_SERVER['PHP_SELF']}?page=" . urlencode( $page );
1285         }
1286
1287         /**
1288          * Finds extensions that follow the format /extensions/Name/Name.php,
1289          * and returns an array containing the value for 'Name' for each found extension.
1290          *
1291          * @return array
1292          */
1293         public function findExtensions() {
1294                 if( $this->getVar( 'IP' ) === null ) {
1295                         return false;
1296                 }
1297
1298                 $exts = array();
1299                 $extDir = $this->getVar( 'IP' ) . '/extensions';
1300                 $dh = opendir( $extDir );
1301
1302                 while ( ( $file = readdir( $dh ) ) !== false ) {
1303                         if( !is_dir( "$extDir/$file" ) ) {
1304                                 continue;
1305                         }
1306                         if( file_exists( "$extDir/$file/$file.php" ) ) {
1307                                 $exts[] = $file;
1308                         }
1309                 }
1310                 natcasesort( $exts );
1311
1312                 return $exts;
1313         }
1314
1315         /**
1316          * Installs the auto-detected extensions.
1317          *
1318          * @return Status
1319          */
1320         protected function includeExtensions() {
1321                 global $IP;
1322                 $exts = $this->getVar( '_Extensions' );
1323                 $IP = $this->getVar( 'IP' );
1324
1325                 /**
1326                  * We need to include DefaultSettings before including extensions to avoid
1327                  * warnings about unset variables. However, the only thing we really
1328                  * want here is $wgHooks['LoadExtensionSchemaUpdates']. This won't work
1329                  * if the extension has hidden hook registration in $wgExtensionFunctions,
1330                  * but we're not opening that can of worms
1331                  * @see https://bugzilla.wikimedia.org/show_bug.cgi?id=26857
1332                  */
1333                 global $wgAutoloadClasses;
1334                 $wgAutoloadClasses = array();
1335
1336                 require( "$IP/includes/DefaultSettings.php" );
1337
1338                 foreach( $exts as $e ) {
1339                         require_once( "$IP/extensions/$e/$e.php" );
1340                 }
1341
1342                 $hooksWeWant = isset( $wgHooks['LoadExtensionSchemaUpdates'] ) ?
1343                         $wgHooks['LoadExtensionSchemaUpdates'] : array();
1344
1345                 // Unset everyone else's hooks. Lord knows what someone might be doing
1346                 // in ParserFirstCallInit (see bug 27171)
1347                 $GLOBALS['wgHooks'] = array( 'LoadExtensionSchemaUpdates' => $hooksWeWant );
1348
1349                 return Status::newGood();
1350         }
1351
1352         /**
1353          * Get an array of install steps. Should always be in the format of
1354          * array(
1355          *   'name'     => 'someuniquename',
1356          *   'callback' => array( $obj, 'method' ),
1357          * )
1358          * There must be a config-install-$name message defined per step, which will
1359          * be shown on install.
1360          *
1361          * @param $installer DatabaseInstaller so we can make callbacks
1362          * @return array
1363          */
1364         protected function getInstallSteps( DatabaseInstaller $installer ) {
1365                 $coreInstallSteps = array(
1366                         array( 'name' => 'database',   'callback' => array( $installer, 'setupDatabase' ) ),
1367                         array( 'name' => 'tables',     'callback' => array( $installer, 'createTables' ) ),
1368                         array( 'name' => 'interwiki',  'callback' => array( $installer, 'populateInterwikiTable' ) ),
1369                         array( 'name' => 'stats',      'callback' => array( $this, 'populateSiteStats' ) ),
1370                         array( 'name' => 'keys',       'callback' => array( $this, 'generateKeys' ) ),
1371                         array( 'name' => 'sysop',      'callback' => array( $this, 'createSysop' ) ),
1372                         array( 'name' => 'mainpage',   'callback' => array( $this, 'createMainpage' ) ),
1373                 );
1374
1375                 // Build the array of install steps starting from the core install list,
1376                 // then adding any callbacks that wanted to attach after a given step
1377                 foreach( $coreInstallSteps as $step ) {
1378                         $this->installSteps[] = $step;
1379                         if( isset( $this->extraInstallSteps[ $step['name'] ] ) ) {
1380                                 $this->installSteps = array_merge(
1381                                         $this->installSteps,
1382                                         $this->extraInstallSteps[ $step['name'] ]
1383                                 );
1384                         }
1385                 }
1386
1387                 // Prepend any steps that want to be at the beginning
1388                 if( isset( $this->extraInstallSteps['BEGINNING'] ) ) {
1389                         $this->installSteps = array_merge(
1390                                 $this->extraInstallSteps['BEGINNING'],
1391                                 $this->installSteps
1392                         );
1393                 }
1394
1395                 // Extensions should always go first, chance to tie into hooks and such
1396                 if( count( $this->getVar( '_Extensions' ) ) ) {
1397                         array_unshift( $this->installSteps,
1398                                 array( 'name' => 'extensions', 'callback' => array( $this, 'includeExtensions' ) )
1399                         );
1400                         $this->installSteps[] = array(
1401                                 'name' => 'extension-tables',
1402                                 'callback' => array( $installer, 'createExtensionTables' )
1403                         );
1404                 }
1405                 return $this->installSteps;
1406         }
1407
1408         /**
1409          * Actually perform the installation.
1410          *
1411          * @param $startCB Array A callback array for the beginning of each step
1412          * @param $endCB Array A callback array for the end of each step
1413          *
1414          * @return Array of Status objects
1415          */
1416         public function performInstallation( $startCB, $endCB ) {
1417                 $installResults = array();
1418                 $installer = $this->getDBInstaller();
1419                 $installer->preInstall();
1420                 $steps = $this->getInstallSteps( $installer );
1421                 foreach( $steps as $stepObj ) {
1422                         $name = $stepObj['name'];
1423                         call_user_func_array( $startCB, array( $name ) );
1424
1425                         // Perform the callback step
1426                         $status = call_user_func( $stepObj['callback'], $installer );
1427
1428                         // Output and save the results
1429                         call_user_func( $endCB, $name, $status );
1430                         $installResults[$name] = $status;
1431
1432                         // If we've hit some sort of fatal, we need to bail.
1433                         // Callback already had a chance to do output above.
1434                         if( !$status->isOk() ) {
1435                                 break;
1436                         }
1437                 }
1438                 if( $status->isOk() ) {
1439                         $this->setVar( '_InstallDone', true );
1440                 }
1441                 return $installResults;
1442         }
1443
1444         /**
1445          * Generate $wgSecretKey. Will warn if we had to use mt_rand() instead of
1446          * /dev/urandom
1447          *
1448          * @return Status
1449          */
1450         public function generateKeys() {
1451                 $keys = array( 'wgSecretKey' => 64 );
1452                 if ( strval( $this->getVar( 'wgUpgradeKey' ) ) === '' ) {
1453                         $keys['wgUpgradeKey'] = 16;
1454                 }
1455                 return $this->doGenerateKeys( $keys );
1456         }
1457
1458         /**
1459          * Generate a secret value for variables using either
1460          * /dev/urandom or mt_rand(). Produce a warning in the later case.
1461          *
1462          * @param $keys Array
1463          * @return Status
1464          */
1465         protected function doGenerateKeys( $keys ) {
1466                 $status = Status::newGood();
1467
1468                 wfSuppressWarnings();
1469                 $file = fopen( "/dev/urandom", "r" );
1470                 wfRestoreWarnings();
1471
1472                 foreach ( $keys as $name => $length ) {
1473                         if ( $file ) {
1474                                         $secretKey = bin2hex( fread( $file, $length / 2 ) );
1475                         } else {
1476                                 $secretKey = '';
1477
1478                                 for ( $i = 0; $i < $length / 8; $i++ ) {
1479                                         $secretKey .= dechex( mt_rand( 0, 0x7fffffff ) );
1480                                 }
1481                         }
1482
1483                         $this->setVar( $name, $secretKey );
1484                 }
1485
1486                 if ( $file ) {
1487                         fclose( $file );
1488                 } else {
1489                         $names = array_keys ( $keys );
1490                         $names = preg_replace( '/^(.*)$/', '\$$1', $names );
1491                         global $wgLang;
1492                         $status->warning( 'config-insecure-keys', $wgLang->listToText( $names ), count( $names ) );
1493                 }
1494
1495                 return $status;
1496         }
1497
1498         /**
1499          * Create the first user account, grant it sysop and bureaucrat rights
1500          *
1501          * @return Status
1502          */
1503         protected function createSysop() {
1504                 $name = $this->getVar( '_AdminName' );
1505                 $user = User::newFromName( $name );
1506
1507                 if ( !$user ) {
1508                         // We should've validated this earlier anyway!
1509                         return Status::newFatal( 'config-admin-error-user', $name );
1510                 }
1511
1512                 if ( $user->idForName() == 0 ) {
1513                         $user->addToDatabase();
1514
1515                         try {
1516                                 $user->setPassword( $this->getVar( '_AdminPassword' ) );
1517                         } catch( PasswordError $pwe ) {
1518                                 return Status::newFatal( 'config-admin-error-password', $name, $pwe->getMessage() );
1519                         }
1520
1521                         $user->addGroup( 'sysop' );
1522                         $user->addGroup( 'bureaucrat' );
1523                         if( $this->getVar( '_AdminEmail' ) ) {
1524                                 $user->setEmail( $this->getVar( '_AdminEmail' ) );
1525                         }
1526                         $user->saveSettings();
1527
1528                         // Update user count
1529                         $ssUpdate = new SiteStatsUpdate( 0, 0, 0, 0, 1 );
1530                         $ssUpdate->doUpdate();
1531                 }
1532                 $status = Status::newGood();
1533
1534                 if( $this->getVar( '_Subscribe' ) && $this->getVar( '_AdminEmail' ) ) {
1535                         $this->subscribeToMediaWikiAnnounce( $status );
1536                 }
1537
1538                 return $status;
1539         }
1540
1541         /**
1542          * @param $s Status
1543          */
1544         private function subscribeToMediaWikiAnnounce( Status $s ) {
1545                 $params = array(
1546                         'email'    => $this->getVar( '_AdminEmail' ),
1547                         'language' => 'en',
1548                         'digest'   => 0
1549                 );
1550
1551                 // Mailman doesn't support as many languages as we do, so check to make
1552                 // sure their selected language is available
1553                 $myLang = $this->getVar( '_UserLang' );
1554                 if( in_array( $myLang, $this->mediaWikiAnnounceLanguages ) ) {
1555                         $myLang = $myLang == 'pt-br' ? 'pt_BR' : $myLang; // rewrite to Mailman's pt_BR
1556                         $params['language'] = $myLang;
1557                 }
1558
1559                 if( MWHttpRequest::canMakeRequests() ) {
1560                         $res = MWHttpRequest::factory( $this->mediaWikiAnnounceUrl,
1561                                 array( 'method' => 'POST', 'postData' => $params ) )->execute();
1562                         if( !$res->isOK() ) {
1563                                 $s->warning( 'config-install-subscribe-fail', $res->getMessage() );
1564                         }
1565                 } else {
1566                         $s->warning( 'config-install-subscribe-notpossible' );
1567                 }
1568         }
1569
1570         /**
1571          * Insert Main Page with default content.
1572          *
1573          * @param $installer DatabaseInstaller
1574          * @return Status
1575          */
1576         protected function createMainpage( DatabaseInstaller $installer ) {
1577                 $status = Status::newGood();
1578                 try {
1579                         $page = WikiPage::factory( Title::newMainPage() );
1580                         $page->doEdit( wfMsgForContent( 'mainpagetext' ) . "\n\n" .
1581                                                         wfMsgForContent( 'mainpagedocfooter' ),
1582                                                         '',
1583                                                         EDIT_NEW,
1584                                                         false,
1585                                                         User::newFromName( 'MediaWiki default' ) );
1586                 } catch (MWException $e) {
1587                         //using raw, because $wgShowExceptionDetails can not be set yet
1588                         $status->fatal( 'config-install-mainpage-failed', $e->getMessage() );
1589                 }
1590
1591                 return $status;
1592         }
1593
1594         /**
1595          * Override the necessary bits of the config to run an installation.
1596          */
1597         public static function overrideConfig() {
1598                 define( 'MW_NO_SESSION', 1 );
1599
1600                 // Don't access the database
1601                 $GLOBALS['wgUseDatabaseMessages'] = false;
1602                 // Debug-friendly
1603                 $GLOBALS['wgShowExceptionDetails'] = true;
1604                 // Don't break forms
1605                 $GLOBALS['wgExternalLinkTarget'] = '_blank';
1606
1607                 // Extended debugging
1608                 $GLOBALS['wgShowSQLErrors'] = true;
1609                 $GLOBALS['wgShowDBErrorBacktrace'] = true;
1610
1611                 // Allow multiple ob_flush() calls
1612                 $GLOBALS['wgDisableOutputCompression'] = true;
1613
1614                 // Use a sensible cookie prefix (not my_wiki)
1615                 $GLOBALS['wgCookiePrefix'] = 'mw_installer';
1616
1617                 // Some of the environment checks make shell requests, remove limits
1618                 $GLOBALS['wgMaxShellMemory'] = 0;
1619         }
1620
1621         /**
1622          * Add an installation step following the given step.
1623          *
1624          * @param $callback Array A valid installation callback array, in this form:
1625          *    array( 'name' => 'some-unique-name', 'callback' => array( $obj, 'function' ) );
1626          * @param $findStep String the step to find. Omit to put the step at the beginning
1627          */
1628         public function addInstallStep( $callback, $findStep = 'BEGINNING' ) {
1629                 $this->extraInstallSteps[$findStep][] = $callback;
1630         }
1631
1632         /**
1633          * Disable the time limit for execution.
1634          * Some long-running pages (Install, Upgrade) will want to do this
1635          */
1636         protected function disableTimeLimit() {
1637                 wfSuppressWarnings();
1638                 set_time_limit( 0 );
1639                 wfRestoreWarnings();
1640         }
1641 }