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