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 ) {
1098                                 $needsUpdate = true;
1099                         }
1100                 }
1101                 if( $intl ) {
1102                         $useNormalizer = 'intl';
1103                         $intl = normalizer_normalize( $not_normal_c, Normalizer::FORM_C );
1104                         if ( $intl !== $normal_c ) {
1105                                 $needsUpdate = true;
1106                         }
1107                 }
1108
1109                 // Uses messages 'config-unicode-using-php', 'config-unicode-using-utf8', 'config-unicode-using-intl'
1110                 if( $useNormalizer === 'php' ) {
1111                         $this->showMessage( 'config-unicode-pure-php-warning' );
1112                 } else {
1113                         $this->showMessage( 'config-unicode-using-' . $useNormalizer );
1114                         if( $needsUpdate ) {
1115                                 $this->showMessage( 'config-unicode-update-warning' );
1116                         }
1117                 }
1118         }
1119
1120         /**
1121          * @return bool
1122          */
1123         protected function envCheckCtype() {
1124                 if ( !function_exists( 'ctype_digit' ) ) {
1125                         $this->showError( 'config-ctype' );
1126                         return false;
1127                 }
1128                 return true;
1129         }
1130
1131         /**
1132          * Get an array of likely places we can find executables. Check a bunch
1133          * of known Unix-like defaults, as well as the PATH environment variable
1134          * (which should maybe make it work for Windows?)
1135          *
1136          * @return Array
1137          */
1138         protected static function getPossibleBinPaths() {
1139                 return array_merge(
1140                         array( '/usr/bin', '/usr/local/bin', '/opt/csw/bin',
1141                                 '/usr/gnu/bin', '/usr/sfw/bin', '/sw/bin', '/opt/local/bin' ),
1142                         explode( PATH_SEPARATOR, getenv( 'PATH' ) )
1143                 );
1144         }
1145
1146         /**
1147          * Search a path for any of the given executable names. Returns the
1148          * executable name if found. Also checks the version string returned
1149          * by each executable.
1150          *
1151          * Used only by environment checks.
1152          *
1153          * @param $path String: path to search
1154          * @param $names Array of executable names
1155          * @param $versionInfo Boolean false or array with two members:
1156          *               0 => Command to run for version check, with $1 for the full executable name
1157          *               1 => String to compare the output with
1158          *
1159          * If $versionInfo is not false, only executables with a version
1160          * matching $versionInfo[1] will be returned.
1161          * @return bool|string
1162          */
1163         public static function locateExecutable( $path, $names, $versionInfo = false ) {
1164                 if ( !is_array( $names ) ) {
1165                         $names = array( $names );
1166                 }
1167
1168                 foreach ( $names as $name ) {
1169                         $command = $path . DIRECTORY_SEPARATOR . $name;
1170
1171                         wfSuppressWarnings();
1172                         $file_exists = file_exists( $command );
1173                         wfRestoreWarnings();
1174
1175                         if ( $file_exists ) {
1176                                 if ( !$versionInfo ) {
1177                                         return $command;
1178                                 }
1179
1180                                 $file = str_replace( '$1', wfEscapeShellArg( $command ), $versionInfo[0] );
1181                                 if ( strstr( wfShellExec( $file ), $versionInfo[1] ) !== false ) {
1182                                         return $command;
1183                                 }
1184                         }
1185                 }
1186                 return false;
1187         }
1188
1189         /**
1190          * Same as locateExecutable(), but checks in getPossibleBinPaths() by default
1191          * @see locateExecutable()
1192          * @param $names
1193          * @param $versionInfo bool
1194          * @return bool|string
1195          */
1196         public static function locateExecutableInDefaultPaths( $names, $versionInfo = false ) {
1197                 foreach( self::getPossibleBinPaths() as $path ) {
1198                         $exe = self::locateExecutable( $path, $names, $versionInfo );
1199                         if( $exe !== false ) {
1200                                 return $exe;
1201                         }
1202                 }
1203                 return false;
1204         }
1205
1206         /**
1207          * Checks if scripts located in the given directory can be executed via the given URL.
1208          *
1209          * Used only by environment checks.
1210          * @param $dir string
1211          * @param $url string
1212          * @return bool|int|string
1213          */
1214         public function dirIsExecutable( $dir, $url ) {
1215                 $scriptTypes = array(
1216                         'php' => array(
1217                                 "<?php echo 'ex' . 'ec';",
1218                                 "#!/var/env php5\n<?php echo 'ex' . 'ec';",
1219                         ),
1220                 );
1221
1222                 // it would be good to check other popular languages here, but it'll be slow.
1223
1224                 wfSuppressWarnings();
1225
1226                 foreach ( $scriptTypes as $ext => $contents ) {
1227                         foreach ( $contents as $source ) {
1228                                 $file = 'exectest.' . $ext;
1229
1230                                 if ( !file_put_contents( $dir . $file, $source ) ) {
1231                                         break;
1232                                 }
1233
1234                                 try {
1235                                         $text = Http::get( $url . $file, array( 'timeout' => 3 ) );
1236                                 }
1237                                 catch( MWException $e ) {
1238                                         // Http::get throws with allow_url_fopen = false and no curl extension.
1239                                         $text = null;
1240                                 }
1241                                 unlink( $dir . $file );
1242
1243                                 if ( $text == 'exec' ) {
1244                                         wfRestoreWarnings();
1245                                         return $ext;
1246                                 }
1247                         }
1248                 }
1249
1250                 wfRestoreWarnings();
1251
1252                 return false;
1253         }
1254
1255         /**
1256          * Checks for presence of an Apache module. Works only if PHP is running as an Apache module, too.
1257          *
1258          * @param $moduleName String: Name of module to check.
1259          * @return bool
1260          */
1261         public static function apacheModulePresent( $moduleName ) {
1262                 if ( function_exists( 'apache_get_modules' ) && in_array( $moduleName, apache_get_modules() ) ) {
1263                         return true;
1264                 }
1265                 // try it the hard way
1266                 ob_start();
1267                 phpinfo( INFO_MODULES );
1268                 $info = ob_get_clean();
1269                 return strpos( $info, $moduleName ) !== false;
1270         }
1271
1272         /**
1273          * ParserOptions are constructed before we determined the language, so fix it
1274          *
1275          * @param $lang Language
1276          */
1277         public function setParserLanguage( $lang ) {
1278                 $this->parserOptions->setTargetLanguage( $lang );
1279                 $this->parserOptions->setUserLang( $lang );
1280         }
1281
1282         /**
1283          * Overridden by WebInstaller to provide lastPage parameters.
1284          * @param $page string
1285          * @return string
1286          */
1287         protected function getDocUrl( $page ) {
1288                 return "{$_SERVER['PHP_SELF']}?page=" . urlencode( $page );
1289         }
1290
1291         /**
1292          * Finds extensions that follow the format /extensions/Name/Name.php,
1293          * and returns an array containing the value for 'Name' for each found extension.
1294          *
1295          * @return array
1296          */
1297         public function findExtensions() {
1298                 if( $this->getVar( 'IP' ) === null ) {
1299                         return false;
1300                 }
1301
1302                 $exts = array();
1303                 $extDir = $this->getVar( 'IP' ) . '/extensions';
1304                 $dh = opendir( $extDir );
1305
1306                 while ( ( $file = readdir( $dh ) ) !== false ) {
1307                         if( !is_dir( "$extDir/$file" ) ) {
1308                                 continue;
1309                         }
1310                         if( file_exists( "$extDir/$file/$file.php" ) ) {
1311                                 $exts[] = $file;
1312                         }
1313                 }
1314                 natcasesort( $exts );
1315
1316                 return $exts;
1317         }
1318
1319         /**
1320          * Installs the auto-detected extensions.
1321          *
1322          * @return Status
1323          */
1324         protected function includeExtensions() {
1325                 global $IP;
1326                 $exts = $this->getVar( '_Extensions' );
1327                 $IP = $this->getVar( 'IP' );
1328
1329                 /**
1330                  * We need to include DefaultSettings before including extensions to avoid
1331                  * warnings about unset variables. However, the only thing we really
1332                  * want here is $wgHooks['LoadExtensionSchemaUpdates']. This won't work
1333                  * if the extension has hidden hook registration in $wgExtensionFunctions,
1334                  * but we're not opening that can of worms
1335                  * @see https://bugzilla.wikimedia.org/show_bug.cgi?id=26857
1336                  */
1337                 global $wgAutoloadClasses;
1338                 $wgAutoloadClasses = array();
1339
1340                 require( "$IP/includes/DefaultSettings.php" );
1341
1342                 foreach( $exts as $e ) {
1343                         require_once( "$IP/extensions/$e/$e.php" );
1344                 }
1345
1346                 $hooksWeWant = isset( $wgHooks['LoadExtensionSchemaUpdates'] ) ?
1347                         $wgHooks['LoadExtensionSchemaUpdates'] : array();
1348
1349                 // Unset everyone else's hooks. Lord knows what someone might be doing
1350                 // in ParserFirstCallInit (see bug 27171)
1351                 $GLOBALS['wgHooks'] = array( 'LoadExtensionSchemaUpdates' => $hooksWeWant );
1352
1353                 return Status::newGood();
1354         }
1355
1356         /**
1357          * Get an array of install steps. Should always be in the format of
1358          * array(
1359          *   'name'     => 'someuniquename',
1360          *   'callback' => array( $obj, 'method' ),
1361          * )
1362          * There must be a config-install-$name message defined per step, which will
1363          * be shown on install.
1364          *
1365          * @param $installer DatabaseInstaller so we can make callbacks
1366          * @return array
1367          */
1368         protected function getInstallSteps( DatabaseInstaller $installer ) {
1369                 $coreInstallSteps = array(
1370                         array( 'name' => 'database',   'callback' => array( $installer, 'setupDatabase' ) ),
1371                         array( 'name' => 'tables',     'callback' => array( $installer, 'createTables' ) ),
1372                         array( 'name' => 'interwiki',  'callback' => array( $installer, 'populateInterwikiTable' ) ),
1373                         array( 'name' => 'stats',      'callback' => array( $this, 'populateSiteStats' ) ),
1374                         array( 'name' => 'keys',       'callback' => array( $this, 'generateKeys' ) ),
1375                         array( 'name' => 'sysop',      'callback' => array( $this, 'createSysop' ) ),
1376                         array( 'name' => 'mainpage',   'callback' => array( $this, 'createMainpage' ) ),
1377                 );
1378
1379                 // Build the array of install steps starting from the core install list,
1380                 // then adding any callbacks that wanted to attach after a given step
1381                 foreach( $coreInstallSteps as $step ) {
1382                         $this->installSteps[] = $step;
1383                         if( isset( $this->extraInstallSteps[ $step['name'] ] ) ) {
1384                                 $this->installSteps = array_merge(
1385                                         $this->installSteps,
1386                                         $this->extraInstallSteps[ $step['name'] ]
1387                                 );
1388                         }
1389                 }
1390
1391                 // Prepend any steps that want to be at the beginning
1392                 if( isset( $this->extraInstallSteps['BEGINNING'] ) ) {
1393                         $this->installSteps = array_merge(
1394                                 $this->extraInstallSteps['BEGINNING'],
1395                                 $this->installSteps
1396                         );
1397                 }
1398
1399                 // Extensions should always go first, chance to tie into hooks and such
1400                 if( count( $this->getVar( '_Extensions' ) ) ) {
1401                         array_unshift( $this->installSteps,
1402                                 array( 'name' => 'extensions', 'callback' => array( $this, 'includeExtensions' ) )
1403                         );
1404                         $this->installSteps[] = array(
1405                                 'name' => 'extension-tables',
1406                                 'callback' => array( $installer, 'createExtensionTables' )
1407                         );
1408                 }
1409                 return $this->installSteps;
1410         }
1411
1412         /**
1413          * Actually perform the installation.
1414          *
1415          * @param $startCB Array A callback array for the beginning of each step
1416          * @param $endCB Array A callback array for the end of each step
1417          *
1418          * @return Array of Status objects
1419          */
1420         public function performInstallation( $startCB, $endCB ) {
1421                 $installResults = array();
1422                 $installer = $this->getDBInstaller();
1423                 $installer->preInstall();
1424                 $steps = $this->getInstallSteps( $installer );
1425                 foreach( $steps as $stepObj ) {
1426                         $name = $stepObj['name'];
1427                         call_user_func_array( $startCB, array( $name ) );
1428
1429                         // Perform the callback step
1430                         $status = call_user_func( $stepObj['callback'], $installer );
1431
1432                         // Output and save the results
1433                         call_user_func( $endCB, $name, $status );
1434                         $installResults[$name] = $status;
1435
1436                         // If we've hit some sort of fatal, we need to bail.
1437                         // Callback already had a chance to do output above.
1438                         if( !$status->isOk() ) {
1439                                 break;
1440                         }
1441                 }
1442                 if( $status->isOk() ) {
1443                         $this->setVar( '_InstallDone', true );
1444                 }
1445                 return $installResults;
1446         }
1447
1448         /**
1449          * Generate $wgSecretKey. Will warn if we had to use an insecure random source.
1450          *
1451          * @return Status
1452          */
1453         public function generateKeys() {
1454                 $keys = array( 'wgSecretKey' => 64 );
1455                 if ( strval( $this->getVar( 'wgUpgradeKey' ) ) === '' ) {
1456                         $keys['wgUpgradeKey'] = 16;
1457                 }
1458                 return $this->doGenerateKeys( $keys );
1459         }
1460
1461         /**
1462          * Generate a secret value for variables using our CryptRand generator.
1463          * Produce a warning if the random source was insecure.
1464          *
1465          * @param $keys Array
1466          * @return Status
1467          */
1468         protected function doGenerateKeys( $keys ) {
1469                 $status = Status::newGood();
1470
1471                 $strong = true;
1472                 foreach ( $keys as $name => $length ) {
1473                         $secretKey = MWCryptRand::generateHex( $length, true );
1474                         if ( !MWCryptRand::wasStrong() ) {
1475                                 $strong = false;
1476                         }
1477
1478                         $this->setVar( $name, $secretKey );
1479                 }
1480
1481                 if ( !$strong ) {
1482                         $names = array_keys( $keys );
1483                         $names = preg_replace( '/^(.*)$/', '\$$1', $names );
1484                         global $wgLang;
1485                         $status->warning( 'config-insecure-keys', $wgLang->listToText( $names ), count( $names ) );
1486                 }
1487
1488                 return $status;
1489         }
1490
1491         /**
1492          * Create the first user account, grant it sysop and bureaucrat rights
1493          *
1494          * @return Status
1495          */
1496         protected function createSysop() {
1497                 $name = $this->getVar( '_AdminName' );
1498                 $user = User::newFromName( $name );
1499
1500                 if ( !$user ) {
1501                         // We should've validated this earlier anyway!
1502                         return Status::newFatal( 'config-admin-error-user', $name );
1503                 }
1504
1505                 if ( $user->idForName() == 0 ) {
1506                         $user->addToDatabase();
1507
1508                         try {
1509                                 $user->setPassword( $this->getVar( '_AdminPassword' ) );
1510                         } catch( PasswordError $pwe ) {
1511                                 return Status::newFatal( 'config-admin-error-password', $name, $pwe->getMessage() );
1512                         }
1513
1514                         $user->addGroup( 'sysop' );
1515                         $user->addGroup( 'bureaucrat' );
1516                         if( $this->getVar( '_AdminEmail' ) ) {
1517                                 $user->setEmail( $this->getVar( '_AdminEmail' ) );
1518                         }
1519                         $user->saveSettings();
1520
1521                         // Update user count
1522                         $ssUpdate = new SiteStatsUpdate( 0, 0, 0, 0, 1 );
1523                         $ssUpdate->doUpdate();
1524                 }
1525                 $status = Status::newGood();
1526
1527                 if( $this->getVar( '_Subscribe' ) && $this->getVar( '_AdminEmail' ) ) {
1528                         $this->subscribeToMediaWikiAnnounce( $status );
1529                 }
1530
1531                 return $status;
1532         }
1533
1534         /**
1535          * @param $s Status
1536          */
1537         private function subscribeToMediaWikiAnnounce( Status $s ) {
1538                 $params = array(
1539                         'email'    => $this->getVar( '_AdminEmail' ),
1540                         'language' => 'en',
1541                         'digest'   => 0
1542                 );
1543
1544                 // Mailman doesn't support as many languages as we do, so check to make
1545                 // sure their selected language is available
1546                 $myLang = $this->getVar( '_UserLang' );
1547                 if( in_array( $myLang, $this->mediaWikiAnnounceLanguages ) ) {
1548                         $myLang = $myLang == 'pt-br' ? 'pt_BR' : $myLang; // rewrite to Mailman's pt_BR
1549                         $params['language'] = $myLang;
1550                 }
1551
1552                 if( MWHttpRequest::canMakeRequests() ) {
1553                         $res = MWHttpRequest::factory( $this->mediaWikiAnnounceUrl,
1554                                 array( 'method' => 'POST', 'postData' => $params ) )->execute();
1555                         if( !$res->isOK() ) {
1556                                 $s->warning( 'config-install-subscribe-fail', $res->getMessage() );
1557                         }
1558                 } else {
1559                         $s->warning( 'config-install-subscribe-notpossible' );
1560                 }
1561         }
1562
1563         /**
1564          * Insert Main Page with default content.
1565          *
1566          * @param $installer DatabaseInstaller
1567          * @return Status
1568          */
1569         protected function createMainpage( DatabaseInstaller $installer ) {
1570                 $status = Status::newGood();
1571                 try {
1572                         $page = WikiPage::factory( Title::newMainPage() );
1573                         $page->doEdit( wfMsgForContent( 'mainpagetext' ) . "\n\n" .
1574                                                         wfMsgForContent( 'mainpagedocfooter' ),
1575                                                         '',
1576                                                         EDIT_NEW,
1577                                                         false,
1578                                                         User::newFromName( 'MediaWiki default' ) );
1579                 } catch (MWException $e) {
1580                         //using raw, because $wgShowExceptionDetails can not be set yet
1581                         $status->fatal( 'config-install-mainpage-failed', $e->getMessage() );
1582                 }
1583
1584                 return $status;
1585         }
1586
1587         /**
1588          * Override the necessary bits of the config to run an installation.
1589          */
1590         public static function overrideConfig() {
1591                 define( 'MW_NO_SESSION', 1 );
1592
1593                 // Don't access the database
1594                 $GLOBALS['wgUseDatabaseMessages'] = false;
1595                 // Debug-friendly
1596                 $GLOBALS['wgShowExceptionDetails'] = true;
1597                 // Don't break forms
1598                 $GLOBALS['wgExternalLinkTarget'] = '_blank';
1599
1600                 // Extended debugging
1601                 $GLOBALS['wgShowSQLErrors'] = true;
1602                 $GLOBALS['wgShowDBErrorBacktrace'] = true;
1603
1604                 // Allow multiple ob_flush() calls
1605                 $GLOBALS['wgDisableOutputCompression'] = true;
1606
1607                 // Use a sensible cookie prefix (not my_wiki)
1608                 $GLOBALS['wgCookiePrefix'] = 'mw_installer';
1609
1610                 // Some of the environment checks make shell requests, remove limits
1611                 $GLOBALS['wgMaxShellMemory'] = 0;
1612         }
1613
1614         /**
1615          * Add an installation step following the given step.
1616          *
1617          * @param $callback Array A valid installation callback array, in this form:
1618          *    array( 'name' => 'some-unique-name', 'callback' => array( $obj, 'function' ) );
1619          * @param $findStep String the step to find. Omit to put the step at the beginning
1620          */
1621         public function addInstallStep( $callback, $findStep = 'BEGINNING' ) {
1622                 $this->extraInstallSteps[$findStep][] = $callback;
1623         }
1624
1625         /**
1626          * Disable the time limit for execution.
1627          * Some long-running pages (Install, Upgrade) will want to do this
1628          */
1629         protected function disableTimeLimit() {
1630                 wfSuppressWarnings();
1631                 set_time_limit( 0 );
1632                 wfRestoreWarnings();
1633         }
1634 }