includes/installer/Installer.php

   1 <?php
   2 /**
   3  * Base code for MediaWiki installer.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  * http://www.gnu.org/copyleft/gpl.html
  19  *
  20  * @file
  21  * @ingroup Deployment
  22  */
  23
  24 /**
  25  * This documentation group collects source code files with deployment functionality.
  26  *
  27  * @defgroup Deployment Deployment
  28  */
  29
  30 /**
  31  * Base installer class.
  32  *
  33  * This class provides the base for installation and update functionality
  34  * for both MediaWiki core and extensions.
  35  *
  36  * @ingroup Deployment
  37  * @since 1.17
  38  */
  39 abstract class Installer {
  40
  41         // This is the absolute minimum PHP version we can support
  42         const MINIMUM_PHP_VERSION = '5.3.2';
  43
  44         /**
  45          * @var array
  46          */
  47         protected $settings;
  48
  49         /**
  50          * Cached DB installer instances, access using getDBInstaller().
  51          *
  52          * @var array
  53          */
  54         protected $dbInstallers = array();
  55
  56         /**
  57          * Minimum memory size in MB.
  58          *
  59          * @var integer
  60          */
  61         protected $minMemorySize = 50;
  62
  63         /**
  64          * Cached Title, used by parse().
  65          *
  66          * @var Title
  67          */
  68         protected $parserTitle;
  69
  70         /**
  71          * Cached ParserOptions, used by parse().
  72          *
  73          * @var ParserOptions
  74          */
  75         protected $parserOptions;
  76
  77         /**
  78          * Known database types. These correspond to the class names <type>Installer,
  79          * and are also MediaWiki database types valid for $wgDBtype.
  80          *
  81          * To add a new type, create a <type>Installer class and a Database<type>
  82          * class, and add a config-type-<type> message to MessagesEn.php.
  83          *
  84          * @var array
  85          */
  86         protected static $dbTypes = array(
  87                 'mysql',
  88                 'postgres',
  89                 'oracle',
  90                 'sqlite',
  91                 'ibm_db2',
  92         );
  93
  94         /**
  95          * A list of environment check methods called by doEnvironmentChecks().
  96          * These may output warnings using showMessage(), and/or abort the
  97          * installation process by returning false.
  98          *
  99          * @var array
 100          */
 101         protected $envChecks = array(
 102                 'envCheckDB',
 103                 'envCheckRegisterGlobals',
 104                 'envCheckBrokenXML',
 105                 'envCheckPHP531',
 106                 'envCheckMagicQuotes',
 107                 'envCheckMagicSybase',
 108                 'envCheckMbstring',
 109                 'envCheckZE1',
 110                 'envCheckSafeMode',
 111                 'envCheckXML',
 112                 'envCheckPCRE',
 113                 'envCheckMemory',
 114                 'envCheckCache',
 115                 'envCheckModSecurity',
 116                 'envCheckDiff3',
 117                 'envCheckGraphics',
 118                 'envCheckServer',
 119                 'envCheckPath',
 120                 'envCheckExtension',
 121                 'envCheckShellLocale',
 122                 'envCheckUploadsDirectory',
 123                 'envCheckLibicu',
 124                 'envCheckSuhosinMaxValueLength',
 125                 'envCheckCtype',
 126         );
 127
 128         /**
 129          * MediaWiki configuration globals that will eventually be passed through
 130          * to LocalSettings.php. The names only are given here, the defaults
 131          * typically come from DefaultSettings.php.
 132          *
 133          * @var array
 134          */
 135         protected $defaultVarNames = array(
 136                 'wgSitename',
 137                 'wgPasswordSender',
 138                 'wgLanguageCode',
 139                 'wgRightsIcon',
 140                 'wgRightsText',
 141                 'wgRightsUrl',
 142                 'wgMainCacheType',
 143                 'wgEnableEmail',
 144                 'wgEnableUserEmail',
 145                 'wgEnotifUserTalk',
 146                 'wgEnotifWatchlist',
 147                 'wgEmailAuthentication',
 148                 'wgDBtype',
 149                 'wgDiff3',
 150                 'wgImageMagickConvertCommand',
 151                 'IP',
 152                 'wgServer',
 153                 'wgScriptPath',
 154                 'wgScriptExtension',
 155                 'wgMetaNamespace',
 156                 'wgDeletedDirectory',
 157                 'wgEnableUploads',
 158                 'wgLogo',
 159                 'wgShellLocale',
 160                 'wgSecretKey',
 161                 'wgUseInstantCommons',
 162                 'wgUpgradeKey',
 163                 'wgDefaultSkin',
 164                 'wgResourceLoaderMaxQueryLength',
 165         );
 166
 167         /**
 168          * Variables that are stored alongside globals, and are used for any
 169          * configuration of the installation process aside from the MediaWiki
 170          * configuration. Map of names to defaults.
 171          *
 172          * @var array
 173          */
 174         protected $internalDefaults = array(
 175                 '_UserLang' => 'en',
 176                 '_Environment' => false,
 177                 '_CompiledDBs' => array(),
 178                 '_SafeMode' => false,
 179                 '_RaiseMemory' => false,
 180                 '_UpgradeDone' => false,
 181                 '_InstallDone' => false,
 182                 '_Caches' => array(),
 183                 '_InstallPassword' => '',
 184                 '_SameAccount' => true,
 185                 '_CreateDBAccount' => false,
 186                 '_NamespaceType' => 'site-name',
 187                 '_AdminName' => '', // will be set later, when the user selects language
 188                 '_AdminPassword' => '',
 189                 '_AdminPassword2' => '',
 190                 '_AdminEmail' => '',
 191                 '_Subscribe' => false,
 192                 '_SkipOptional' => 'continue',
 193                 '_RightsProfile' => 'wiki',
 194                 '_LicenseCode' => 'none',
 195                 '_CCDone' => false,
 196                 '_Extensions' => array(),
 197                 '_MemCachedServers' => '',
 198                 '_UpgradeKeySupplied' => false,
 199                 '_ExistingDBSettings' => false,
 200         );
 201
 202         /**
 203          * The actual list of installation steps. This will be initialized by getInstallSteps()
 204          *
 205          * @var array
 206          */
 207         private $installSteps = array();
 208
 209         /**
 210          * Extra steps for installation, for things like DatabaseInstallers to modify
 211          *
 212          * @var array
 213          */
 214         protected $extraInstallSteps = array();
 215
 216         /**
 217          * Known object cache types and the functions used to test for their existence.
 218          *
 219          * @var array
 220          */
 221         protected $objectCaches = array(
 222                 'xcache' => 'xcache_get',
 223                 'apc' => 'apc_fetch',
 224                 'wincache' => 'wincache_ucache_get'
 225         );
 226
 227         /**
 228          * User rights profiles.
 229          *
 230          * @var array
 231          */
 232         public $rightsProfiles = array(
 233                 'wiki' => array(),
 234                 'no-anon' => array(
 235                         '*' => array( 'edit' => false )
 236                 ),
 237                 'fishbowl' => array(
 238                         '*' => array(
 239                                 'createaccount' => false,
 240                                 'edit' => false,
 241                         ),
 242                 ),
 243                 'private' => array(
 244                         '*' => array(
 245                                 'createaccount' => false,
 246                                 'edit' => false,
 247                                 'read' => false,
 248                         ),
 249                 ),
 250         );
 251
 252         /**
 253          * License types.
 254          *
 255          * @var array
 256          */
 257         public $licenses = array(
 258                 'cc-by' => array(
 259                         'url' => 'http://creativecommons.org/licenses/by/3.0/',
 260                         'icon' => '{$wgStylePath}/common/images/cc-by.png',
 261                 ),
 262                 'cc-by-sa' => array(
 263                         'url' => 'http://creativecommons.org/licenses/by-sa/3.0/',
 264                         'icon' => '{$wgStylePath}/common/images/cc-by-sa.png',
 265                 ),
 266                 'cc-by-nc-sa' => array(
 267                         'url' => 'http://creativecommons.org/licenses/by-nc-sa/3.0/',
 268                         'icon' => '{$wgStylePath}/common/images/cc-by-nc-sa.png',
 269                 ),
 270                 'cc-0' => array(
 271                         'url' => 'https://creativecommons.org/publicdomain/zero/1.0/',
 272                         'icon' => '{$wgStylePath}/common/images/cc-0.png',
 273                 ),
 274                 'pd' => array(
 275                         'url' => '',
 276                         'icon' => '{$wgStylePath}/common/images/public-domain.png',
 277                 ),
 278                 'gfdl' => array(
 279                         'url' => 'http://www.gnu.org/copyleft/fdl.html',
 280                         'icon' => '{$wgStylePath}/common/images/gnu-fdl.png',
 281                 ),
 282                 'none' => array(
 283                         'url' => '',
 284                         'icon' => '',
 285                         'text' => ''
 286                 ),
 287                 'cc-choose' => array(
 288                         // Details will be filled in by the selector.
 289                         'url' => '',
 290                         'icon' => '',
 291                         'text' => '',
 292                 ),
 293         );
 294
 295         /**
 296          * URL to mediawiki-announce subscription
 297          */
 298         protected $mediaWikiAnnounceUrl = 'https://lists.wikimedia.org/mailman/subscribe/mediawiki-announce';
 299
 300         /**
 301          * Supported language codes for Mailman
 302          */
 303         protected $mediaWikiAnnounceLanguages = array(
 304                 'ca', 'cs', 'da', 'de', 'en', 'es', 'et', 'eu', 'fi', 'fr', 'hr', 'hu',
 305                 'it', 'ja', 'ko', 'lt', 'nl', 'no', 'pl', 'pt', 'pt-br', 'ro', 'ru',
 306                 'sl', 'sr', 'sv', 'tr', 'uk'
 307         );
 308
 309         /**
 310          * UI interface for displaying a short message
 311          * The parameters are like parameters to wfMessage().
 312          * The messages will be in wikitext format, which will be converted to an
 313          * output format such as HTML or text before being sent to the user.
 314          * @param $msg
 315          */
 316         public abstract function showMessage( $msg /*, ... */ );
 317
 318         /**
 319          * Same as showMessage(), but for displaying errors
 320          * @param $msg
 321          */
 322         public abstract function showError( $msg /*, ... */ );
 323
 324         /**
 325          * Show a message to the installing user by using a Status object
 326          * @param $status Status
 327          */
 328         public abstract function showStatusMessage( Status $status );
 329
 330         /**
 331          * Constructor, always call this from child classes.
 332          */
 333         public function __construct() {
 334                 global $wgExtensionMessagesFiles, $wgUser;
 335
 336                 // Disable the i18n cache and LoadBalancer
 337                 Language::getLocalisationCache()->disableBackend();
 338                 LBFactory::disableBackend();
 339
 340                 // Load the installer's i18n file.
 341                 $wgExtensionMessagesFiles['MediawikiInstaller'] =
 342                         __DIR__ . '/Installer.i18n.php';
 343
 344                 // Having a user with id = 0 safeguards us from DB access via User::loadOptions().
 345                 $wgUser = User::newFromId( 0 );
 346
 347                 $this->settings = $this->internalDefaults;
 348
 349                 foreach ( $this->defaultVarNames as $var ) {
 350                         $this->settings[$var] = $GLOBALS[$var];
 351                 }
 352
 353                 $compiledDBs = array();
 354                 foreach ( self::getDBTypes() as $type ) {
 355                         $installer = $this->getDBInstaller( $type );
 356
 357                         if ( !$installer->isCompiled() ) {
 358                                 continue;
 359                         }
 360                         $compiledDBs[] = $type;
 361
 362                         $defaults = $installer->getGlobalDefaults();
 363
 364                         foreach ( $installer->getGlobalNames() as $var ) {
 365                                 if ( isset( $defaults[$var] ) ) {
 366                                         $this->settings[$var] = $defaults[$var];
 367                                 } else {
 368                                         $this->settings[$var] = $GLOBALS[$var];
 369                                 }
 370                         }
 371                 }
 372                 $this->setVar( '_CompiledDBs', $compiledDBs );
 373
 374                 $this->parserTitle = Title::newFromText( 'Installer' );
 375                 $this->parserOptions = new ParserOptions; // language will  be wrong :(
 376                 $this->parserOptions->setEditSection( false );
 377         }
 378
 379         /**
 380          * Get a list of known DB types.
 381          *
 382          * @return array
 383          */
 384         public static function getDBTypes() {
 385                 return self::$dbTypes;
 386         }
 387
 388         /**
 389          * Do initial checks of the PHP environment. Set variables according to
 390          * the observed environment.
 391          *
 392          * It's possible that this may be called under the CLI SAPI, not the SAPI
 393          * that the wiki will primarily run under. In that case, the subclass should
 394          * initialise variables such as wgScriptPath, before calling this function.
 395          *
 396          * Under the web subclass, it can already be assumed that PHP 5+ is in use
 397          * and that sessions are working.
 398          *
 399          * @return Status
 400          */
 401         public function doEnvironmentChecks() {
 402                 $phpVersion = phpversion();
 403                 if( version_compare( $phpVersion, self::MINIMUM_PHP_VERSION, '>=' ) ) {
 404                         $this->showMessage( 'config-env-php', $phpVersion );
 405                         $good = true;
 406                 } else {
 407                         $this->showMessage( 'config-env-php-toolow', $phpVersion, self::MINIMUM_PHP_VERSION );
 408                         $good = false;
 409                 }
 410
 411                 if( $good ) {
 412                         foreach ( $this->envChecks as $check ) {
 413                                 $status = $this->$check();
 414                                 if ( $status === false ) {
 415                                         $good = false;
 416                                 }
 417                         }
 418                 }
 419
 420                 $this->setVar( '_Environment', $good );
 421
 422                 return $good ? Status::newGood() : Status::newFatal( 'config-env-bad' );
 423         }
 424
 425         /**
 426          * Set a MW configuration variable, or internal installer configuration variable.
 427          *
 428          * @param $name String
 429          * @param $value Mixed
 430          */
 431         public function setVar( $name, $value ) {
 432                 $this->settings[$name] = $value;
 433         }
 434
 435         /**
 436          * Get an MW configuration variable, or internal installer configuration variable.
 437          * The defaults come from $GLOBALS (ultimately DefaultSettings.php).
 438          * Installer variables are typically prefixed by an underscore.
 439          *
 440          * @param $name String
 441          * @param $default Mixed
 442          *
 443          * @return mixed
 444          */
 445         public function getVar( $name, $default = null ) {
 446                 if ( !isset( $this->settings[$name] ) ) {
 447                         return $default;
 448                 } else {
 449                         return $this->settings[$name];
 450                 }
 451         }
 452
 453         /**
 454          * Get an instance of DatabaseInstaller for the specified DB type.
 455          *
 456          * @param $type Mixed: DB installer for which is needed, false to use default.
 457          *
 458          * @return DatabaseInstaller
 459          */
 460         public function getDBInstaller( $type = false ) {
 461                 if ( !$type ) {
 462                         $type = $this->getVar( 'wgDBtype' );
 463                 }
 464
 465                 $type = strtolower( $type );
 466
 467                 if ( !isset( $this->dbInstallers[$type] ) ) {
 468                         $class = ucfirst( $type ). 'Installer';
 469                         $this->dbInstallers[$type] = new $class( $this );
 470                 }
 471
 472                 return $this->dbInstallers[$type];
 473         }
 474
 475         /**
 476          * Determine if LocalSettings.php exists. If it does, return its variables,
 477          * merged with those from AdminSettings.php, as an array.
 478          *
 479          * @return Array
 480          */
 481         public static function getExistingLocalSettings() {
 482                 global $IP;
 483
 484                 wfSuppressWarnings();
 485                 $_lsExists = file_exists( "$IP/LocalSettings.php" );
 486                 wfRestoreWarnings();
 487
 488                 if( !$_lsExists ) {
 489                         return false;
 490                 }
 491                 unset($_lsExists);
 492
 493                 require( "$IP/includes/DefaultSettings.php" );
 494                 require( "$IP/LocalSettings.php" );
 495                 if ( file_exists( "$IP/AdminSettings.php" ) ) {
 496                         require( "$IP/AdminSettings.php" );
 497                 }
 498                 return get_defined_vars();
 499         }
 500
 501         /**
 502          * Get a fake password for sending back to the user in HTML.
 503          * This is a security mechanism to avoid compromise of the password in the
 504          * event of session ID compromise.
 505          *
 506          * @param $realPassword String
 507          *
 508          * @return string
 509          */
 510         public function getFakePassword( $realPassword ) {
 511                 return str_repeat( '*', strlen( $realPassword ) );
 512         }
 513
 514         /**
 515          * Set a variable which stores a password, except if the new value is a
 516          * fake password in which case leave it as it is.
 517          *
 518          * @param $name String
 519          * @param $value Mixed
 520          */
 521         public function setPassword( $name, $value ) {
 522                 if ( !preg_match( '/^\*+$/', $value ) ) {
 523                         $this->setVar( $name, $value );
 524                 }
 525         }
 526
 527         /**
 528          * On POSIX systems return the primary group of the webserver we're running under.
 529          * On other systems just returns null.
 530          *
 531          * This is used to advice the user that he should chgrp his mw-config/data/images directory as the
 532          * webserver user before he can install.
 533          *
 534          * Public because SqliteInstaller needs it, and doesn't subclass Installer.
 535          *
 536          * @return mixed
 537          */
 538         public static function maybeGetWebserverPrimaryGroup() {
 539                 if ( !function_exists( 'posix_getegid' ) || !function_exists( 'posix_getpwuid' ) ) {
 540                         # I don't know this, this isn't UNIX.
 541                         return null;
 542                 }
 543
 544                 # posix_getegid() *not* getmygid() because we want the group of the webserver,
 545                 # not whoever owns the current script.
 546                 $gid = posix_getegid();
 547                 $getpwuid = posix_getpwuid( $gid );
 548                 $group = $getpwuid['name'];
 549
 550                 return $group;
 551         }
 552
 553         /**
 554          * Convert wikitext $text to HTML.
 555          *
 556          * This is potentially error prone since many parser features require a complete
 557          * installed MW database. The solution is to just not use those features when you
 558          * write your messages. This appears to work well enough. Basic formatting and
 559          * external links work just fine.
 560          *
 561          * But in case a translator decides to throw in a "#ifexist" or internal link or
 562          * whatever, this function is guarded to catch the attempted DB access and to present
 563          * some fallback text.
 564          *
 565          * @param $text String
 566          * @param $lineStart Boolean
 567          * @return String
 568          */
 569         public function parse( $text, $lineStart = false ) {
 570                 global $wgParser;
 571
 572                 try {
 573                         $out = $wgParser->parse( $text, $this->parserTitle, $this->parserOptions, $lineStart );
 574                         $html = $out->getText();
 575                 } catch ( DBAccessError $e ) {
 576                         $html = '<!--DB access attempted during parse-->  ' . htmlspecialchars( $text );
 577
 578                         if ( !empty( $this->debug ) ) {
 579                                 $html .= "<!--\n" . $e->getTraceAsString() . "\n-->";
 580                         }
 581                 }
 582
 583                 return $html;
 584         }
 585
 586         /**
 587          * @return ParserOptions
 588          */
 589         public function getParserOptions() {
 590                 return $this->parserOptions;
 591         }
 592
 593         public function disableLinkPopups() {
 594                 $this->parserOptions->setExternalLinkTarget( false );
 595         }
 596
 597         public function restoreLinkPopups() {
 598                 global $wgExternalLinkTarget;
 599                 $this->parserOptions->setExternalLinkTarget( $wgExternalLinkTarget );
 600         }
 601
 602         /**
 603          * Install step which adds a row to the site_stats table with appropriate
 604          * initial values.
 605          *
 606          * @param $installer DatabaseInstaller
 607          *
 608          * @return Status
 609          */
 610         public function populateSiteStats( DatabaseInstaller $installer ) {
 611                 $status = $installer->getConnection();
 612                 if ( !$status->isOK() ) {
 613                         return $status;
 614                 }
 615                 $status->value->insert( 'site_stats', array(
 616                         'ss_row_id' => 1,
 617                         'ss_total_views' => 0,
 618                         'ss_total_edits' => 0,
 619                         'ss_good_articles' => 0,
 620                         'ss_total_pages' => 0,
 621                         'ss_users' => 0,
 622                         'ss_images' => 0 ),
 623                         __METHOD__, 'IGNORE' );
 624                 return Status::newGood();
 625         }
 626
 627         /**
 628          * Exports all wg* variables stored by the installer into global scope.
 629          */
 630         public function exportVars() {
 631                 foreach ( $this->settings as $name => $value ) {
 632                         if ( substr( $name, 0, 2 ) == 'wg' ) {
 633                                 $GLOBALS[$name] = $value;
 634                         }
 635                 }
 636         }
 637
 638         /**
 639          * Environment check for DB types.
 640          * @return bool
 641          */
 642         protected function envCheckDB() {
 643                 global $wgLang;
 644
 645                 $allNames = array();
 646
 647                 foreach ( self::getDBTypes() as $name ) {
 648                         $allNames[] = wfMessage( "config-type-$name" )->text();
 649                 }
 650
 651                 // cache initially available databases to make sure that everything will be displayed correctly
 652                 // after a refresh on env checks page
 653                 $databases = $this->getVar( '_CompiledDBs-preFilter' );
 654                 if ( !$databases ) {
 655                         $databases = $this->getVar( '_CompiledDBs' );
 656                         $this->setVar( '_CompiledDBs-preFilter', $databases );
 657                 }
 658
 659                 $databases = array_flip ( $databases );
 660                 foreach ( array_keys( $databases ) as $db ) {
 661                         $installer = $this->getDBInstaller( $db );
 662                         $status = $installer->checkPrerequisites();
 663                         if ( !$status->isGood() ) {
 664                                 $this->showStatusMessage( $status );
 665                         }
 666                         if ( !$status->isOK() ) {
 667                                 unset( $databases[$db] );
 668                         }
 669                 }
 670                 $databases = array_flip( $databases );
 671                 if ( !$databases ) {
 672                         $this->showError( 'config-no-db', $wgLang->commaList( $allNames ) );
 673                         // @todo FIXME: This only works for the web installer!
 674                         return false;
 675                 }
 676                 $this->setVar( '_CompiledDBs', $databases );
 677                 return true;
 678         }
 679
 680         /**
 681          * Environment check for register_globals.
 682          */
 683         protected function envCheckRegisterGlobals() {
 684                 if( wfIniGetBool( 'register_globals' ) ) {
 685                         $this->showMessage( 'config-register-globals' );
 686                 }
 687         }
 688
 689         /**
 690          * Some versions of libxml+PHP break < and > encoding horribly
 691          * @return bool
 692          */
 693         protected function envCheckBrokenXML() {
 694                 $test = new PhpXmlBugTester();
 695                 if ( !$test->ok ) {
 696                         $this->showError( 'config-brokenlibxml' );
 697                         return false;
 698                 }
 699                 return true;
 700         }
 701
 702         /**
 703          * Test PHP (probably 5.3.1, but it could regress again) to make sure that
 704          * reference parameters to __call() are not converted to null
 705          * @return bool
 706          */
 707         protected function envCheckPHP531() {
 708                 $test = new PhpRefCallBugTester;
 709                 $test->execute();
 710                 if ( !$test->ok ) {
 711                         $this->showError( 'config-using531', phpversion() );
 712                         return false;
 713                 }
 714                 return true;
 715         }
 716
 717         /**
 718          * Environment check for magic_quotes_runtime.
 719          * @return bool
 720          */
 721         protected function envCheckMagicQuotes() {
 722                 if( wfIniGetBool( "magic_quotes_runtime" ) ) {
 723                         $this->showError( 'config-magic-quotes-runtime' );
 724                         return false;
 725                 }
 726                 return true;
 727         }
 728
 729         /**
 730          * Environment check for magic_quotes_sybase.
 731          * @return bool
 732          */
 733         protected function envCheckMagicSybase() {
 734                 if ( wfIniGetBool( 'magic_quotes_sybase' ) ) {
 735                         $this->showError( 'config-magic-quotes-sybase' );
 736                         return false;
 737                 }
 738                 return true;
 739         }
 740
 741         /**
 742          * Environment check for mbstring.func_overload.
 743          * @return bool
 744          */
 745         protected function envCheckMbstring() {
 746                 if ( wfIniGetBool( 'mbstring.func_overload' ) ) {
 747                         $this->showError( 'config-mbstring' );
 748                         return false;
 749                 }
 750                 return true;
 751         }
 752
 753         /**
 754          * Environment check for zend.ze1_compatibility_mode.
 755          * @return bool
 756          */
 757         protected function envCheckZE1() {
 758                 if ( wfIniGetBool( 'zend.ze1_compatibility_mode' ) ) {
 759                         $this->showError( 'config-ze1' );
 760                         return false;
 761                 }
 762                 return true;
 763         }
 764
 765         /**
 766          * Environment check for safe_mode.
 767          * @return bool
 768          */
 769         protected function envCheckSafeMode() {
 770                 if ( wfIniGetBool( 'safe_mode' ) ) {
 771                         $this->setVar( '_SafeMode', true );
 772                         $this->showMessage( 'config-safe-mode' );
 773                 }
 774                 return true;
 775         }
 776
 777         /**
 778          * Environment check for the XML module.
 779          * @return bool
 780          */
 781         protected function envCheckXML() {
 782                 if ( !function_exists( "utf8_encode" ) ) {
 783                         $this->showError( 'config-xml-bad' );
 784                         return false;
 785                 }
 786                 return true;
 787         }
 788
 789         /**
 790          * Environment check for the PCRE module.
 791          *
 792          * @note If this check were to fail, the parser would
 793          *   probably throw an exception before the result
 794          *   of this check is shown to the user.
 795          * @return bool
 796          */
 797         protected function envCheckPCRE() {
 798                 if ( !function_exists( 'preg_match' ) ) {
 799                         $this->showError( 'config-pcre' );
 800                         return false;
 801                 }
 802                 wfSuppressWarnings();
 803                 $regexd = preg_replace( '/[\x{0430}-\x{04FF}]/iu', '', '-АБВГД-' );
 804                 // Need to check for \p support too, as PCRE can be compiled
 805                 // with utf8 support, but not unicode property support.
 806                 // check that \p{Zs} (space separators) matches
 807                 // U+3000 (Ideographic space)
 808                 $regexprop = preg_replace( '/\p{Zs}/u', '', "-\xE3\x80\x80-" );
 809                 wfRestoreWarnings();
 810                 if ( $regexd != '--' || $regexprop != '--' ) {
 811                         $this->showError( 'config-pcre-no-utf8' );
 812                         return false;
 813                 }
 814                 return true;
 815         }
 816
 817         /**
 818          * Environment check for available memory.
 819          * @return bool
 820          */
 821         protected function envCheckMemory() {
 822                 $limit = ini_get( 'memory_limit' );
 823
 824                 if ( !$limit || $limit == -1 ) {
 825                         return true;
 826                 }
 827
 828                 $n = wfShorthandToInteger( $limit );
 829
 830                 if( $n < $this->minMemorySize * 1024 * 1024 ) {
 831                         $newLimit = "{$this->minMemorySize}M";
 832
 833                         if( ini_set( "memory_limit", $newLimit ) === false ) {
 834                                 $this->showMessage( 'config-memory-bad', $limit );
 835                         } else {
 836                                 $this->showMessage( 'config-memory-raised', $limit, $newLimit );
 837                                 $this->setVar( '_RaiseMemory', true );
 838                         }
 839                 }
 840                 return true;
 841         }
 842
 843         /**
 844          * Environment check for compiled object cache types.
 845          */
 846         protected function envCheckCache() {
 847                 $caches = array();
 848                 foreach ( $this->objectCaches as $name => $function ) {
 849                         if ( function_exists( $function ) ) {
 850                                 if ( $name == 'xcache' && !wfIniGetBool( 'xcache.var_size' ) ) {
 851                                         continue;
 852                                 }
 853                                 $caches[$name] = true;
 854                         }
 855                 }
 856
 857                 if ( !$caches ) {
 858                         $this->showMessage( 'config-no-cache' );
 859                 }
 860
 861                 $this->setVar( '_Caches', $caches );
 862         }
 863
 864         /**
 865          * Scare user to death if they have mod_security
 866          * @return bool
 867          */
 868         protected function envCheckModSecurity() {
 869                 if ( self::apacheModulePresent( 'mod_security' ) ) {
 870                         $this->showMessage( 'config-mod-security' );
 871                 }
 872                 return true;
 873         }
 874
 875         /**
 876          * Search for GNU diff3.
 877          * @return bool
 878          */
 879         protected function envCheckDiff3() {
 880                 $names = array( "gdiff3", "diff3", "diff3.exe" );
 881                 $versionInfo = array( '$1 --version 2>&1', 'GNU diffutils' );
 882
 883                 $diff3 = self::locateExecutableInDefaultPaths( $names, $versionInfo );
 884
 885                 if ( $diff3 ) {
 886                         $this->setVar( 'wgDiff3', $diff3 );
 887                 } else {
 888                         $this->setVar( 'wgDiff3', false );
 889                         $this->showMessage( 'config-diff3-bad' );
 890                 }
 891                 return true;
 892         }
 893
 894         /**
 895          * Environment check for ImageMagick and GD.
 896          * @return bool
 897          */
 898         protected function envCheckGraphics() {
 899                 $names = array( wfIsWindows() ? 'convert.exe' : 'convert' );
 900                 $convert = self::locateExecutableInDefaultPaths( $names, array( '$1 -version', 'ImageMagick' ) );
 901
 902                 $this->setVar( 'wgImageMagickConvertCommand', '' );
 903                 if ( $convert ) {
 904                         $this->setVar( 'wgImageMagickConvertCommand', $convert );
 905                         $this->showMessage( 'config-imagemagick', $convert );
 906                         return true;
 907                 } elseif ( function_exists( 'imagejpeg' ) ) {
 908                         $this->showMessage( 'config-gd' );
 909
 910                 } else {
 911                         $this->showMessage( 'config-no-scaling' );
 912                 }
 913                 return true;
 914         }
 915
 916         /**
 917          * Environment check for the server hostname.
 918          */
 919         protected function envCheckServer() {
 920                 $server = $this->envGetDefaultServer();
 921                 $this->showMessage( 'config-using-server', $server );
 922                 $this->setVar( 'wgServer', $server );
 923                 return true;
 924         }
 925
 926         /**
 927          * Helper function to be called from envCheckServer()
 928          * @return String
 929          */
 930         protected abstract function envGetDefaultServer();
 931
 932         /**
 933          * Environment check for setting $IP and $wgScriptPath.
 934          * @return bool
 935          */
 936         protected function envCheckPath() {
 937                 global $IP;
 938                 $IP = dirname( dirname( __DIR__ ) );
 939                 $this->setVar( 'IP', $IP );
 940
 941                 $this->showMessage( 'config-using-uri', $this->getVar( 'wgServer' ), $this->getVar( 'wgScriptPath' ) );
 942                 return true;
 943         }
 944
 945         /**
 946          * Environment check for setting the preferred PHP file extension.
 947          */
 948         protected function envCheckExtension() {
 949                 // @todo FIXME: Detect this properly
 950                 if ( defined( 'MW_INSTALL_PHP5_EXT' ) ) {
 951                         $ext = 'php5';
 952                 } else {
 953                         $ext = 'php';
 954                 }
 955                 $this->setVar( 'wgScriptExtension', ".$ext" );
 956                 return true;
 957         }
 958
 959         /**
 960          * TODO: document
 961          * @return bool
 962          */
 963         protected function envCheckShellLocale() {
 964                 $os = php_uname( 's' );
 965                 $supported = array( 'Linux', 'SunOS', 'HP-UX', 'Darwin' ); # Tested these
 966
 967                 if ( !in_array( $os, $supported ) ) {
 968                         return true;
 969                 }
 970
 971                 # Get a list of available locales.
 972                 $ret = false;
 973                 $lines = wfShellExec( '/usr/bin/locale -a', $ret );
 974
 975                 if ( $ret ) {
 976                         return true;
 977                 }
 978
 979                 $lines = wfArrayMap( 'trim', explode( "\n", $lines ) );
 980                 $candidatesByLocale = array();
 981                 $candidatesByLang = array();
 982
 983                 foreach ( $lines as $line ) {
 984                         if ( $line === '' ) {
 985                                 continue;
 986                         }
 987
 988                         if ( !preg_match( '/^([a-zA-Z]+)(_[a-zA-Z]+|)\.(utf8|UTF-8)(@[a-zA-Z_]*|)$/i', $line, $m ) ) {
 989                                 continue;
 990                         }
 991
 992                         list( $all, $lang, $territory, $charset, $modifier ) = $m;
 993
 994                         $candidatesByLocale[$m[0]] = $m;
 995                         $candidatesByLang[$lang][] = $m;
 996                 }
 997
 998                 # Try the current value of LANG.
 999                 if ( isset( $candidatesByLocale[ getenv( 'LANG' ) ] ) ) {
1000                         $this->setVar( 'wgShellLocale', getenv( 'LANG' ) );
1001                         return true;
1002                 }
1003
1004                 # Try the most common ones.
1005                 $commonLocales = array( 'en_US.UTF-8', 'en_US.utf8', 'de_DE.UTF-8', 'de_DE.utf8' );
1006                 foreach ( $commonLocales as $commonLocale ) {
1007                         if ( isset( $candidatesByLocale[$commonLocale] ) ) {
1008                                 $this->setVar( 'wgShellLocale', $commonLocale );
1009                                 return true;
1010                         }
1011                 }
1012
1013                 # Is there an available locale in the Wiki's language?
1014                 $wikiLang = $this->getVar( 'wgLanguageCode' );
1015
1016                 if ( isset( $candidatesByLang[$wikiLang] ) ) {
1017                         $m = reset( $candidatesByLang[$wikiLang] );
1018                         $this->setVar( 'wgShellLocale', $m[0] );
1019                         return true;
1020                 }
1021
1022                 # Are there any at all?
1023                 if ( count( $candidatesByLocale ) ) {
1024                         $m = reset( $candidatesByLocale );
1025                         $this->setVar( 'wgShellLocale', $m[0] );
1026                         return true;
1027                 }
1028
1029                 # Give up.
1030                 return true;
1031         }
1032
1033         /**
1034          * TODO: document
1035          * @return bool
1036          */
1037         protected function envCheckUploadsDirectory() {
1038                 global $IP;
1039
1040                 $dir = $IP . '/images/';
1041                 $url = $this->getVar( 'wgServer' ) . $this->getVar( 'wgScriptPath' ) . '/images/';
1042                 $safe = !$this->dirIsExecutable( $dir, $url );
1043
1044                 if ( !$safe ) {
1045                         $this->showMessage( 'config-uploads-not-safe', $dir );
1046                 }
1047                 return true;
1048         }
1049
1050         /**
1051          * Checks if suhosin.get.max_value_length is set, and if so, sets
1052          * $wgResourceLoaderMaxQueryLength to that value in the generated
1053          * LocalSettings file
1054          * @return bool
1055          */
1056         protected function envCheckSuhosinMaxValueLength() {
1057                 $maxValueLength = ini_get( 'suhosin.get.max_value_length' );
1058                 if ( $maxValueLength > 0 ) {
1059                         if( $maxValueLength < 1024 ) {
1060                                 # Only warn if the value is below the sane 1024
1061                                 $this->showMessage( 'config-suhosin-max-value-length', $maxValueLength );
1062                         }
1063                 } else {
1064                         $maxValueLength = -1;
1065                 }
1066                 $this->setVar( 'wgResourceLoaderMaxQueryLength', $maxValueLength );
1067                 return true;
1068         }
1069
1070         /**
1071          * Convert a hex string representing a Unicode code point to that code point.
1072          * @param $c String
1073          * @return string
1074          */
1075         protected function unicodeChar( $c ) {
1076                 $c = hexdec($c);
1077                 if ($c <= 0x7F) {
1078                         return chr($c);
1079                 } elseif ($c <= 0x7FF) {
1080                         return chr(0xC0 | $c >> 6) . chr(0x80 | $c & 0x3F);
1081                 } elseif ($c <= 0xFFFF) {
1082                         return chr(0xE0 | $c >> 12) . chr(0x80 | $c >> 6 & 0x3F)
1083                                 . chr(0x80 | $c & 0x3F);
1084                 } elseif ($c <= 0x10FFFF) {
1085                         return chr(0xF0 | $c >> 18) . chr(0x80 | $c >> 12 & 0x3F)
1086                                 . chr(0x80 | $c >> 6 & 0x3F)
1087                                 . chr(0x80 | $c & 0x3F);
1088                 } else {
1089                         return false;
1090                 }
1091         }
1092
1093
1094         /**
1095          * Check the libicu version
1096          */
1097         protected function envCheckLibicu() {
1098                 $utf8 = function_exists( 'utf8_normalize' );
1099                 $intl = function_exists( 'normalizer_normalize' );
1100
1101                 /**
1102                  * This needs to be updated something that the latest libicu
1103                  * will properly normalize.  This normalization was found at
1104                  * http://www.unicode.org/versions/Unicode5.2.0/#Character_Additions
1105                  * Note that we use the hex representation to create the code
1106                  * points in order to avoid any Unicode-destroying during transit.
1107                  */
1108                 $not_normal_c = $this->unicodeChar("FA6C");
1109                 $normal_c = $this->unicodeChar("242EE");
1110
1111                 $useNormalizer = 'php';
1112                 $needsUpdate = false;
1113
1114                 /**
1115                  * We're going to prefer the pecl extension here unless
1116                  * utf8_normalize is more up to date.
1117                  */
1118                 if( $utf8 ) {
1119                         $useNormalizer = 'utf8';
1120                         $utf8 = utf8_normalize( $not_normal_c, UtfNormal::UNORM_NFC );
1121                         if ( $utf8 !== $normal_c ) {
1122                                 $needsUpdate = true;
1123                         }
1124                 }
1125                 if( $intl ) {
1126                         $useNormalizer = 'intl';
1127                         $intl = normalizer_normalize( $not_normal_c, Normalizer::FORM_C );
1128                         if ( $intl !== $normal_c ) {
1129                                 $needsUpdate = true;
1130                         }
1131                 }
1132
1133                 // Uses messages 'config-unicode-using-php', 'config-unicode-using-utf8', 'config-unicode-using-intl'
1134                 if( $useNormalizer === 'php' ) {
1135                         $this->showMessage( 'config-unicode-pure-php-warning' );
1136                 } else {
1137                         $this->showMessage( 'config-unicode-using-' . $useNormalizer );
1138                         if( $needsUpdate ) {
1139                                 $this->showMessage( 'config-unicode-update-warning' );
1140                         }
1141                 }
1142         }
1143
1144         /**
1145          * @return bool
1146          */
1147         protected function envCheckCtype() {
1148                 if ( !function_exists( 'ctype_digit' ) ) {
1149                         $this->showError( 'config-ctype' );
1150                         return false;
1151                 }
1152                 return true;
1153         }
1154
1155         /**
1156          * Get an array of likely places we can find executables. Check a bunch
1157          * of known Unix-like defaults, as well as the PATH environment variable
1158          * (which should maybe make it work for Windows?)
1159          *
1160          * @return Array
1161          */
1162         protected static function getPossibleBinPaths() {
1163                 return array_merge(
1164                         array( '/usr/bin', '/usr/local/bin', '/opt/csw/bin',
1165                                 '/usr/gnu/bin', '/usr/sfw/bin', '/sw/bin', '/opt/local/bin' ),
1166                         explode( PATH_SEPARATOR, getenv( 'PATH' ) )
1167                 );
1168         }
1169
1170         /**
1171          * Search a path for any of the given executable names. Returns the
1172          * executable name if found. Also checks the version string returned
1173          * by each executable.
1174          *
1175          * Used only by environment checks.
1176          *
1177          * @param $path String: path to search
1178          * @param $names Array of executable names
1179          * @param $versionInfo Boolean false or array with two members:
1180          *               0 => Command to run for version check, with $1 for the full executable name
1181          *               1 => String to compare the output with
1182          *
1183          * If $versionInfo is not false, only executables with a version
1184          * matching $versionInfo[1] will be returned.
1185          * @return bool|string
1186          */
1187         public static function locateExecutable( $path, $names, $versionInfo = false ) {
1188                 if ( !is_array( $names ) ) {
1189                         $names = array( $names );
1190                 }
1191
1192                 foreach ( $names as $name ) {
1193                         $command = $path . DIRECTORY_SEPARATOR . $name;
1194
1195                         wfSuppressWarnings();
1196                         $file_exists = file_exists( $command );
1197                         wfRestoreWarnings();
1198
1199                         if ( $file_exists ) {
1200                                 if ( !$versionInfo ) {
1201                                         return $command;
1202                                 }
1203
1204                                 $file = str_replace( '$1', wfEscapeShellArg( $command ), $versionInfo[0] );
1205                                 if ( strstr( wfShellExec( $file ), $versionInfo[1] ) !== false ) {
1206                                         return $command;
1207                                 }
1208                         }
1209                 }
1210                 return false;
1211         }
1212
1213         /**
1214          * Same as locateExecutable(), but checks in getPossibleBinPaths() by default
1215          * @see locateExecutable()
1216          * @param $names
1217          * @param $versionInfo bool
1218          * @return bool|string
1219          */
1220         public static function locateExecutableInDefaultPaths( $names, $versionInfo = false ) {
1221                 foreach( self::getPossibleBinPaths() as $path ) {
1222                         $exe = self::locateExecutable( $path, $names, $versionInfo );
1223                         if( $exe !== false ) {
1224                                 return $exe;
1225                         }
1226                 }
1227                 return false;
1228         }
1229
1230         /**
1231          * Checks if scripts located in the given directory can be executed via the given URL.
1232          *
1233          * Used only by environment checks.
1234          * @param $dir string
1235          * @param $url string
1236          * @return bool|int|string
1237          */
1238         public function dirIsExecutable( $dir, $url ) {
1239                 $scriptTypes = array(
1240                         'php' => array(
1241                                 "<?php echo 'ex' . 'ec';",
1242                                 "#!/var/env php5\n<?php echo 'ex' . 'ec';",
1243                         ),
1244                 );
1245
1246                 // it would be good to check other popular languages here, but it'll be slow.
1247
1248                 wfSuppressWarnings();
1249
1250                 foreach ( $scriptTypes as $ext => $contents ) {
1251                         foreach ( $contents as $source ) {
1252                                 $file = 'exectest.' . $ext;
1253
1254                                 if ( !file_put_contents( $dir . $file, $source ) ) {
1255                                         break;
1256                                 }
1257
1258                                 try {
1259                                         $text = Http::get( $url . $file, array( 'timeout' => 3 ) );
1260                                 }
1261                                 catch( MWException $e ) {
1262                                         // Http::get throws with allow_url_fopen = false and no curl extension.
1263                                         $text = null;
1264                                 }
1265                                 unlink( $dir . $file );
1266
1267                                 if ( $text == 'exec' ) {
1268                                         wfRestoreWarnings();
1269                                         return $ext;
1270                                 }
1271                         }
1272                 }
1273
1274                 wfRestoreWarnings();
1275
1276                 return false;
1277         }
1278
1279         /**
1280          * Checks for presence of an Apache module. Works only if PHP is running as an Apache module, too.
1281          *
1282          * @param $moduleName String: Name of module to check.
1283          * @return bool
1284          */
1285         public static function apacheModulePresent( $moduleName ) {
1286                 if ( function_exists( 'apache_get_modules' ) && in_array( $moduleName, apache_get_modules() ) ) {
1287                         return true;
1288                 }
1289                 // try it the hard way
1290                 ob_start();
1291                 phpinfo( INFO_MODULES );
1292                 $info = ob_get_clean();
1293                 return strpos( $info, $moduleName ) !== false;
1294         }
1295
1296         /**
1297          * ParserOptions are constructed before we determined the language, so fix it
1298          *
1299          * @param $lang Language
1300          */
1301         public function setParserLanguage( $lang ) {
1302                 $this->parserOptions->setTargetLanguage( $lang );
1303                 $this->parserOptions->setUserLang( $lang );
1304         }
1305
1306         /**
1307          * Overridden by WebInstaller to provide lastPage parameters.
1308          * @param $page string
1309          * @return string
1310          */
1311         protected function getDocUrl( $page ) {
1312                 return "{$_SERVER['PHP_SELF']}?page=" . urlencode( $page );
1313         }
1314
1315         /**
1316          * Finds extensions that follow the format /extensions/Name/Name.php,
1317          * and returns an array containing the value for 'Name' for each found extension.
1318          *
1319          * @return array
1320          */
1321         public function findExtensions() {
1322                 if( $this->getVar( 'IP' ) === null ) {
1323                         return false;
1324                 }
1325
1326                 $exts = array();
1327                 $extDir = $this->getVar( 'IP' ) . '/extensions';
1328                 $dh = opendir( $extDir );
1329
1330                 while ( ( $file = readdir( $dh ) ) !== false ) {
1331                         if( !is_dir( "$extDir/$file" ) ) {
1332                                 continue;
1333                         }
1334                         if( file_exists( "$extDir/$file/$file.php" ) ) {
1335                                 $exts[] = $file;
1336                         }
1337                 }
1338                 natcasesort( $exts );
1339
1340                 return $exts;
1341         }
1342
1343         /**
1344          * Installs the auto-detected extensions.
1345          *
1346          * @return Status
1347          */
1348         protected function includeExtensions() {
1349                 global $IP;
1350                 $exts = $this->getVar( '_Extensions' );
1351                 $IP = $this->getVar( 'IP' );
1352
1353                 /**
1354                  * We need to include DefaultSettings before including extensions to avoid
1355                  * warnings about unset variables. However, the only thing we really
1356                  * want here is $wgHooks['LoadExtensionSchemaUpdates']. This won't work
1357                  * if the extension has hidden hook registration in $wgExtensionFunctions,
1358                  * but we're not opening that can of worms
1359                  * @see https://bugzilla.wikimedia.org/show_bug.cgi?id=26857
1360                  */
1361                 global $wgAutoloadClasses;
1362                 $wgAutoloadClasses = array();
1363
1364                 require( "$IP/includes/DefaultSettings.php" );
1365
1366                 foreach( $exts as $e ) {
1367                         require_once( "$IP/extensions/$e/$e.php" );
1368                 }
1369
1370                 $hooksWeWant = isset( $wgHooks['LoadExtensionSchemaUpdates'] ) ?
1371                         $wgHooks['LoadExtensionSchemaUpdates'] : array();
1372
1373                 // Unset everyone else's hooks. Lord knows what someone might be doing
1374                 // in ParserFirstCallInit (see bug 27171)
1375                 $GLOBALS['wgHooks'] = array( 'LoadExtensionSchemaUpdates' => $hooksWeWant );
1376
1377                 return Status::newGood();
1378         }
1379
1380         /**
1381          * Get an array of install steps. Should always be in the format of
1382          * array(
1383          *   'name'     => 'someuniquename',
1384          *   'callback' => array( $obj, 'method' ),
1385          * )
1386          * There must be a config-install-$name message defined per step, which will
1387          * be shown on install.
1388          *
1389          * @param $installer DatabaseInstaller so we can make callbacks
1390          * @return array
1391          */
1392         protected function getInstallSteps( DatabaseInstaller $installer ) {
1393                 $coreInstallSteps = array(
1394                         array( 'name' => 'database',   'callback' => array( $installer, 'setupDatabase' ) ),
1395                         array( 'name' => 'tables',     'callback' => array( $installer, 'createTables' ) ),
1396                         array( 'name' => 'interwiki',  'callback' => array( $installer, 'populateInterwikiTable' ) ),
1397                         array( 'name' => 'stats',      'callback' => array( $this, 'populateSiteStats' ) ),
1398                         array( 'name' => 'keys',       'callback' => array( $this, 'generateKeys' ) ),
1399                         array( 'name' => 'sysop',      'callback' => array( $this, 'createSysop' ) ),
1400                         array( 'name' => 'mainpage',   'callback' => array( $this, 'createMainpage' ) ),
1401                 );
1402
1403                 // Build the array of install steps starting from the core install list,
1404                 // then adding any callbacks that wanted to attach after a given step
1405                 foreach( $coreInstallSteps as $step ) {
1406                         $this->installSteps[] = $step;
1407                         if( isset( $this->extraInstallSteps[ $step['name'] ] ) ) {
1408                                 $this->installSteps = array_merge(
1409                                         $this->installSteps,
1410                                         $this->extraInstallSteps[ $step['name'] ]
1411                                 );
1412                         }
1413                 }
1414
1415                 // Prepend any steps that want to be at the beginning
1416                 if( isset( $this->extraInstallSteps['BEGINNING'] ) ) {
1417                         $this->installSteps = array_merge(
1418                                 $this->extraInstallSteps['BEGINNING'],
1419                                 $this->installSteps
1420                         );
1421                 }
1422
1423                 // Extensions should always go first, chance to tie into hooks and such
1424                 if( count( $this->getVar( '_Extensions' ) ) ) {
1425                         array_unshift( $this->installSteps,
1426                                 array( 'name' => 'extensions', 'callback' => array( $this, 'includeExtensions' ) )
1427                         );
1428                         $this->installSteps[] = array(
1429                                 'name' => 'extension-tables',
1430                                 'callback' => array( $installer, 'createExtensionTables' )
1431                         );
1432                 }
1433                 return $this->installSteps;
1434         }
1435
1436         /**
1437          * Actually perform the installation.
1438          *
1439          * @param $startCB Array A callback array for the beginning of each step
1440          * @param $endCB Array A callback array for the end of each step
1441          *
1442          * @return Array of Status objects
1443          */
1444         public function performInstallation( $startCB, $endCB ) {
1445                 $installResults = array();
1446                 $installer = $this->getDBInstaller();
1447                 $installer->preInstall();
1448                 $steps = $this->getInstallSteps( $installer );
1449                 foreach( $steps as $stepObj ) {
1450                         $name = $stepObj['name'];
1451                         call_user_func_array( $startCB, array( $name ) );
1452
1453                         // Perform the callback step
1454                         $status = call_user_func( $stepObj['callback'], $installer );
1455
1456                         // Output and save the results
1457                         call_user_func( $endCB, $name, $status );
1458                         $installResults[$name] = $status;
1459
1460                         // If we've hit some sort of fatal, we need to bail.
1461                         // Callback already had a chance to do output above.
1462                         if( !$status->isOk() ) {
1463                                 break;
1464                         }
1465                 }
1466                 if( $status->isOk() ) {
1467                         $this->setVar( '_InstallDone', true );
1468                 }
1469                 return $installResults;
1470         }
1471
1472         /**
1473          * Generate $wgSecretKey. Will warn if we had to use an insecure random source.
1474          *
1475          * @return Status
1476          */
1477         public function generateKeys() {
1478                 $keys = array( 'wgSecretKey' => 64 );
1479                 if ( strval( $this->getVar( 'wgUpgradeKey' ) ) === '' ) {
1480                         $keys['wgUpgradeKey'] = 16;
1481                 }
1482                 return $this->doGenerateKeys( $keys );
1483         }
1484
1485         /**
1486          * Generate a secret value for variables using our CryptRand generator.
1487          * Produce a warning if the random source was insecure.
1488          *
1489          * @param $keys Array
1490          * @return Status
1491          */
1492         protected function doGenerateKeys( $keys ) {
1493                 $status = Status::newGood();
1494
1495                 $strong = true;
1496                 foreach ( $keys as $name => $length ) {
1497                         $secretKey = MWCryptRand::generateHex( $length, true );
1498                         if ( !MWCryptRand::wasStrong() ) {
1499                                 $strong = false;
1500                         }
1501
1502                         $this->setVar( $name, $secretKey );
1503                 }
1504
1505                 if ( !$strong ) {
1506                         $names = array_keys( $keys );
1507                         $names = preg_replace( '/^(.*)$/', '\$$1', $names );
1508                         global $wgLang;
1509                         $status->warning( 'config-insecure-keys', $wgLang->listToText( $names ), count( $names ) );
1510                 }
1511
1512                 return $status;
1513         }
1514
1515         /**
1516          * Create the first user account, grant it sysop and bureaucrat rights
1517          *
1518          * @return Status
1519          */
1520         protected function createSysop() {
1521                 $name = $this->getVar( '_AdminName' );
1522                 $user = User::newFromName( $name );
1523
1524                 if ( !$user ) {
1525                         // We should've validated this earlier anyway!
1526                         return Status::newFatal( 'config-admin-error-user', $name );
1527                 }
1528
1529                 if ( $user->idForName() == 0 ) {
1530                         $user->addToDatabase();
1531
1532                         try {
1533                                 $user->setPassword( $this->getVar( '_AdminPassword' ) );
1534                         } catch( PasswordError $pwe ) {
1535                                 return Status::newFatal( 'config-admin-error-password', $name, $pwe->getMessage() );
1536                         }
1537
1538                         $user->addGroup( 'sysop' );
1539                         $user->addGroup( 'bureaucrat' );
1540                         if( $this->getVar( '_AdminEmail' ) ) {
1541                                 $user->setEmail( $this->getVar( '_AdminEmail' ) );
1542                         }
1543                         $user->saveSettings();
1544
1545                         // Update user count
1546                         $ssUpdate = new SiteStatsUpdate( 0, 0, 0, 0, 1 );
1547                         $ssUpdate->doUpdate();
1548                 }
1549                 $status = Status::newGood();
1550
1551                 if( $this->getVar( '_Subscribe' ) && $this->getVar( '_AdminEmail' ) ) {
1552                         $this->subscribeToMediaWikiAnnounce( $status );
1553                 }
1554
1555                 return $status;
1556         }
1557
1558         /**
1559          * @param $s Status
1560          */
1561         private function subscribeToMediaWikiAnnounce( Status $s ) {
1562                 $params = array(
1563                         'email'    => $this->getVar( '_AdminEmail' ),
1564                         'language' => 'en',
1565                         'digest'   => 0
1566                 );
1567
1568                 // Mailman doesn't support as many languages as we do, so check to make
1569                 // sure their selected language is available
1570                 $myLang = $this->getVar( '_UserLang' );
1571                 if( in_array( $myLang, $this->mediaWikiAnnounceLanguages ) ) {
1572                         $myLang = $myLang == 'pt-br' ? 'pt_BR' : $myLang; // rewrite to Mailman's pt_BR
1573                         $params['language'] = $myLang;
1574                 }
1575
1576                 if( MWHttpRequest::canMakeRequests() ) {
1577                         $res = MWHttpRequest::factory( $this->mediaWikiAnnounceUrl,
1578                                 array( 'method' => 'POST', 'postData' => $params ) )->execute();
1579                         if( !$res->isOK() ) {
1580                                 $s->warning( 'config-install-subscribe-fail', $res->getMessage() );
1581                         }
1582                 } else {
1583                         $s->warning( 'config-install-subscribe-notpossible' );
1584                 }
1585         }
1586
1587         /**
1588          * Insert Main Page with default content.
1589          *
1590          * @param $installer DatabaseInstaller
1591          * @return Status
1592          */
1593         protected function createMainpage( DatabaseInstaller $installer ) {
1594                 $status = Status::newGood();
1595                 try {
1596                         $page = WikiPage::factory( Title::newMainPage() );
1597                         $content = new WikitextContent (
1598                                 wfMessage( 'mainpagetext' )->inContentLanguage()->text() . "\n\n" .
1599                                 wfMessage( 'mainpagedocfooter' )->inContentLanguage()->text()
1600                         );
1601
1602                         $page->doEditContent( $content,
1603                                         '',
1604                                         EDIT_NEW,
1605                                         false,
1606                                         User::newFromName( 'MediaWiki default' ) );
1607                 } catch (MWException $e) {
1608                         //using raw, because $wgShowExceptionDetails can not be set yet
1609                         $status->fatal( 'config-install-mainpage-failed', $e->getMessage() );
1610                 }
1611
1612                 return $status;
1613         }
1614
1615         /**
1616          * Override the necessary bits of the config to run an installation.
1617          */
1618         public static function overrideConfig() {
1619                 define( 'MW_NO_SESSION', 1 );
1620
1621                 // Don't access the database
1622                 $GLOBALS['wgUseDatabaseMessages'] = false;
1623                 // Don't cache langconv tables
1624                 $GLOBALS['wgLanguageConverterCacheType'] = CACHE_NONE;
1625                 // Debug-friendly
1626                 $GLOBALS['wgShowExceptionDetails'] = true;
1627                 // Don't break forms
1628                 $GLOBALS['wgExternalLinkTarget'] = '_blank';
1629
1630                 // Extended debugging
1631                 $GLOBALS['wgShowSQLErrors'] = true;
1632                 $GLOBALS['wgShowDBErrorBacktrace'] = true;
1633
1634                 // Allow multiple ob_flush() calls
1635                 $GLOBALS['wgDisableOutputCompression'] = true;
1636
1637                 // Use a sensible cookie prefix (not my_wiki)
1638                 $GLOBALS['wgCookiePrefix'] = 'mw_installer';
1639
1640                 // Some of the environment checks make shell requests, remove limits
1641                 $GLOBALS['wgMaxShellMemory'] = 0;
1642         }
1643
1644         /**
1645          * Add an installation step following the given step.
1646          *
1647          * @param $callback Array A valid installation callback array, in this form:
1648          *    array( 'name' => 'some-unique-name', 'callback' => array( $obj, 'function' ) );
1649          * @param $findStep String the step to find. Omit to put the step at the beginning
1650          */
1651         public function addInstallStep( $callback, $findStep = 'BEGINNING' ) {
1652                 $this->extraInstallSteps[$findStep][] = $callback;
1653         }
1654
1655         /**
1656          * Disable the time limit for execution.
1657          * Some long-running pages (Install, Upgrade) will want to do this
1658          */
1659         protected function disableTimeLimit() {
1660                 wfSuppressWarnings();
1661                 set_time_limit( 0 );
1662                 wfRestoreWarnings();
1663         }
1664 }