includes/installer/Installer.php

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