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( , $lang, , , ) = $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          * Check the libicu version
1094          */
1095         protected function envCheckLibicu() {
1096                 $utf8 = function_exists( 'utf8_normalize' );
1097                 $intl = function_exists( 'normalizer_normalize' );
1098
1099                 /**
1100                  * This needs to be updated something that the latest libicu
1101                  * will properly normalize.  This normalization was found at
1102                  * http://www.unicode.org/versions/Unicode5.2.0/#Character_Additions
1103                  * Note that we use the hex representation to create the code
1104                  * points in order to avoid any Unicode-destroying during transit.
1105                  */
1106                 $not_normal_c = $this->unicodeChar( "FA6C" );
1107                 $normal_c = $this->unicodeChar( "242EE" );
1108
1109                 $useNormalizer = 'php';
1110                 $needsUpdate = false;
1111
1112                 /**
1113                  * We're going to prefer the pecl extension here unless
1114                  * utf8_normalize is more up to date.
1115                  */
1116                 if( $utf8 ) {
1117                         $useNormalizer = 'utf8';
1118                         $utf8 = utf8_normalize( $not_normal_c, UtfNormal::UNORM_NFC );
1119                         if ( $utf8 !== $normal_c ) {
1120                                 $needsUpdate = true;
1121                         }
1122                 }
1123                 if( $intl ) {
1124                         $useNormalizer = 'intl';
1125                         $intl = normalizer_normalize( $not_normal_c, Normalizer::FORM_C );
1126                         if ( $intl !== $normal_c ) {
1127                                 $needsUpdate = true;
1128                         }
1129                 }
1130
1131                 // Uses messages 'config-unicode-using-php', 'config-unicode-using-utf8', 'config-unicode-using-intl'
1132                 if( $useNormalizer === 'php' ) {
1133                         $this->showMessage( 'config-unicode-pure-php-warning' );
1134                 } else {
1135                         $this->showMessage( 'config-unicode-using-' . $useNormalizer );
1136                         if( $needsUpdate ) {
1137                                 $this->showMessage( 'config-unicode-update-warning' );
1138                         }
1139                 }
1140         }
1141
1142         /**
1143          * @return bool
1144          */
1145         protected function envCheckCtype() {
1146                 if ( !function_exists( 'ctype_digit' ) ) {
1147                         $this->showError( 'config-ctype' );
1148                         return false;
1149                 }
1150                 return true;
1151         }
1152
1153         /**
1154          * Get an array of likely places we can find executables. Check a bunch
1155          * of known Unix-like defaults, as well as the PATH environment variable
1156          * (which should maybe make it work for Windows?)
1157          *
1158          * @return Array
1159          */
1160         protected static function getPossibleBinPaths() {
1161                 return array_merge(
1162                         array( '/usr/bin', '/usr/local/bin', '/opt/csw/bin',
1163                                 '/usr/gnu/bin', '/usr/sfw/bin', '/sw/bin', '/opt/local/bin' ),
1164                         explode( PATH_SEPARATOR, getenv( 'PATH' ) )
1165                 );
1166         }
1167
1168         /**
1169          * Search a path for any of the given executable names. Returns the
1170          * executable name if found. Also checks the version string returned
1171          * by each executable.
1172          *
1173          * Used only by environment checks.
1174          *
1175          * @param $path String: path to search
1176          * @param $names Array of executable names
1177          * @param $versionInfo Boolean false or array with two members:
1178          *               0 => Command to run for version check, with $1 for the full executable name
1179          *               1 => String to compare the output with
1180          *
1181          * If $versionInfo is not false, only executables with a version
1182          * matching $versionInfo[1] will be returned.
1183          * @return bool|string
1184          */
1185         public static function locateExecutable( $path, $names, $versionInfo = false ) {
1186                 if ( !is_array( $names ) ) {
1187                         $names = array( $names );
1188                 }
1189
1190                 foreach ( $names as $name ) {
1191                         $command = $path . DIRECTORY_SEPARATOR . $name;
1192
1193                         wfSuppressWarnings();
1194                         $file_exists = file_exists( $command );
1195                         wfRestoreWarnings();
1196
1197                         if ( $file_exists ) {
1198                                 if ( !$versionInfo ) {
1199                                         return $command;
1200                                 }
1201
1202                                 $file = str_replace( '$1', wfEscapeShellArg( $command ), $versionInfo[0] );
1203                                 if ( strstr( wfShellExec( $file ), $versionInfo[1] ) !== false ) {
1204                                         return $command;
1205                                 }
1206                         }
1207                 }
1208                 return false;
1209         }
1210
1211         /**
1212          * Same as locateExecutable(), but checks in getPossibleBinPaths() by default
1213          * @see locateExecutable()
1214          * @param $names
1215          * @param $versionInfo bool
1216          * @return bool|string
1217          */
1218         public static function locateExecutableInDefaultPaths( $names, $versionInfo = false ) {
1219                 foreach( self::getPossibleBinPaths() as $path ) {
1220                         $exe = self::locateExecutable( $path, $names, $versionInfo );
1221                         if( $exe !== false ) {
1222                                 return $exe;
1223                         }
1224                 }
1225                 return false;
1226         }
1227
1228         /**
1229          * Checks if scripts located in the given directory can be executed via the given URL.
1230          *
1231          * Used only by environment checks.
1232          * @param $dir string
1233          * @param $url string
1234          * @return bool|int|string
1235          */
1236         public function dirIsExecutable( $dir, $url ) {
1237                 $scriptTypes = array(
1238                         'php' => array(
1239                                 "<?php echo 'ex' . 'ec';",
1240                                 "#!/var/env php5\n<?php echo 'ex' . 'ec';",
1241                         ),
1242                 );
1243
1244                 // it would be good to check other popular languages here, but it'll be slow.
1245
1246                 wfSuppressWarnings();
1247
1248                 foreach ( $scriptTypes as $ext => $contents ) {
1249                         foreach ( $contents as $source ) {
1250                                 $file = 'exectest.' . $ext;
1251
1252                                 if ( !file_put_contents( $dir . $file, $source ) ) {
1253                                         break;
1254                                 }
1255
1256                                 try {
1257                                         $text = Http::get( $url . $file, array( 'timeout' => 3 ) );
1258                                 }
1259                                 catch( MWException $e ) {
1260                                         // Http::get throws with allow_url_fopen = false and no curl extension.
1261                                         $text = null;
1262                                 }
1263                                 unlink( $dir . $file );
1264
1265                                 if ( $text == 'exec' ) {
1266                                         wfRestoreWarnings();
1267                                         return $ext;
1268                                 }
1269                         }
1270                 }
1271
1272                 wfRestoreWarnings();
1273
1274                 return false;
1275         }
1276
1277         /**
1278          * Checks for presence of an Apache module. Works only if PHP is running as an Apache module, too.
1279          *
1280          * @param $moduleName String: Name of module to check.
1281          * @return bool
1282          */
1283         public static function apacheModulePresent( $moduleName ) {
1284                 if ( function_exists( 'apache_get_modules' ) && in_array( $moduleName, apache_get_modules() ) ) {
1285                         return true;
1286                 }
1287                 // try it the hard way
1288                 ob_start();
1289                 phpinfo( INFO_MODULES );
1290                 $info = ob_get_clean();
1291                 return strpos( $info, $moduleName ) !== false;
1292         }
1293
1294         /**
1295          * ParserOptions are constructed before we determined the language, so fix it
1296          *
1297          * @param $lang Language
1298          */
1299         public function setParserLanguage( $lang ) {
1300                 $this->parserOptions->setTargetLanguage( $lang );
1301                 $this->parserOptions->setUserLang( $lang );
1302         }
1303
1304         /**
1305          * Overridden by WebInstaller to provide lastPage parameters.
1306          * @param $page string
1307          * @return string
1308          */
1309         protected function getDocUrl( $page ) {
1310                 return "{$_SERVER['PHP_SELF']}?page=" . urlencode( $page );
1311         }
1312
1313         /**
1314          * Finds extensions that follow the format /extensions/Name/Name.php,
1315          * and returns an array containing the value for 'Name' for each found extension.
1316          *
1317          * @return array
1318          */
1319         public function findExtensions() {
1320                 if( $this->getVar( 'IP' ) === null ) {
1321                         return false;
1322                 }
1323
1324                 $exts = array();
1325                 $extDir = $this->getVar( 'IP' ) . '/extensions';
1326                 $dh = opendir( $extDir );
1327
1328                 while ( ( $file = readdir( $dh ) ) !== false ) {
1329                         if( !is_dir( "$extDir/$file" ) ) {
1330                                 continue;
1331                         }
1332                         if( file_exists( "$extDir/$file/$file.php" ) ) {
1333                                 $exts[] = $file;
1334                         }
1335                 }
1336                 natcasesort( $exts );
1337
1338                 return $exts;
1339         }
1340
1341         /**
1342          * Installs the auto-detected extensions.
1343          *
1344          * @return Status
1345          */
1346         protected function includeExtensions() {
1347                 global $IP;
1348                 $exts = $this->getVar( '_Extensions' );
1349                 $IP = $this->getVar( 'IP' );
1350
1351                 /**
1352                  * We need to include DefaultSettings before including extensions to avoid
1353                  * warnings about unset variables. However, the only thing we really
1354                  * want here is $wgHooks['LoadExtensionSchemaUpdates']. This won't work
1355                  * if the extension has hidden hook registration in $wgExtensionFunctions,
1356                  * but we're not opening that can of worms
1357                  * @see https://bugzilla.wikimedia.org/show_bug.cgi?id=26857
1358                  */
1359                 global $wgAutoloadClasses;
1360                 $wgAutoloadClasses = array();
1361
1362                 require( "$IP/includes/DefaultSettings.php" );
1363
1364                 foreach( $exts as $e ) {
1365                         require_once( "$IP/extensions/$e/$e.php" );
1366                 }
1367
1368                 $hooksWeWant = isset( $wgHooks['LoadExtensionSchemaUpdates'] ) ?
1369                         $wgHooks['LoadExtensionSchemaUpdates'] : array();
1370
1371                 // Unset everyone else's hooks. Lord knows what someone might be doing
1372                 // in ParserFirstCallInit (see bug 27171)
1373                 $GLOBALS['wgHooks'] = array( 'LoadExtensionSchemaUpdates' => $hooksWeWant );
1374
1375                 return Status::newGood();
1376         }
1377
1378         /**
1379          * Get an array of install steps. Should always be in the format of
1380          * array(
1381          *   'name'     => 'someuniquename',
1382          *   'callback' => array( $obj, 'method' ),
1383          * )
1384          * There must be a config-install-$name message defined per step, which will
1385          * be shown on install.
1386          *
1387          * @param $installer DatabaseInstaller so we can make callbacks
1388          * @return array
1389          */
1390         protected function getInstallSteps( DatabaseInstaller $installer ) {
1391                 $coreInstallSteps = array(
1392                         array( 'name' => 'database',   'callback' => array( $installer, 'setupDatabase' ) ),
1393                         array( 'name' => 'tables',     'callback' => array( $installer, 'createTables' ) ),
1394                         array( 'name' => 'interwiki',  'callback' => array( $installer, 'populateInterwikiTable' ) ),
1395                         array( 'name' => 'stats',      'callback' => array( $this, 'populateSiteStats' ) ),
1396                         array( 'name' => 'keys',       'callback' => array( $this, 'generateKeys' ) ),
1397                         array( 'name' => 'sysop',      'callback' => array( $this, 'createSysop' ) ),
1398                         array( 'name' => 'mainpage',   'callback' => array( $this, 'createMainpage' ) ),
1399                 );
1400
1401                 // Build the array of install steps starting from the core install list,
1402                 // then adding any callbacks that wanted to attach after a given step
1403                 foreach( $coreInstallSteps as $step ) {
1404                         $this->installSteps[] = $step;
1405                         if( isset( $this->extraInstallSteps[ $step['name'] ] ) ) {
1406                                 $this->installSteps = array_merge(
1407                                         $this->installSteps,
1408                                         $this->extraInstallSteps[ $step['name'] ]
1409                                 );
1410                         }
1411                 }
1412
1413                 // Prepend any steps that want to be at the beginning
1414                 if( isset( $this->extraInstallSteps['BEGINNING'] ) ) {
1415                         $this->installSteps = array_merge(
1416                                 $this->extraInstallSteps['BEGINNING'],
1417                                 $this->installSteps
1418                         );
1419                 }
1420
1421                 // Extensions should always go first, chance to tie into hooks and such
1422                 if( count( $this->getVar( '_Extensions' ) ) ) {
1423                         array_unshift( $this->installSteps,
1424                                 array( 'name' => 'extensions', 'callback' => array( $this, 'includeExtensions' ) )
1425                         );
1426                         $this->installSteps[] = array(
1427                                 'name' => 'extension-tables',
1428                                 'callback' => array( $installer, 'createExtensionTables' )
1429                         );
1430                 }
1431                 return $this->installSteps;
1432         }
1433
1434         /**
1435          * Actually perform the installation.
1436          *
1437          * @param $startCB Array A callback array for the beginning of each step
1438          * @param $endCB Array A callback array for the end of each step
1439          *
1440          * @return Array of Status objects
1441          */
1442         public function performInstallation( $startCB, $endCB ) {
1443                 $installResults = array();
1444                 $installer = $this->getDBInstaller();
1445                 $installer->preInstall();
1446                 $steps = $this->getInstallSteps( $installer );
1447                 foreach( $steps as $stepObj ) {
1448                         $name = $stepObj['name'];
1449                         call_user_func_array( $startCB, array( $name ) );
1450
1451                         // Perform the callback step
1452                         $status = call_user_func( $stepObj['callback'], $installer );
1453
1454                         // Output and save the results
1455                         call_user_func( $endCB, $name, $status );
1456                         $installResults[$name] = $status;
1457
1458                         // If we've hit some sort of fatal, we need to bail.
1459                         // Callback already had a chance to do output above.
1460                         if( !$status->isOk() ) {
1461                                 break;
1462                         }
1463                 }
1464                 if( $status->isOk() ) {
1465                         $this->setVar( '_InstallDone', true );
1466                 }
1467                 return $installResults;
1468         }
1469
1470         /**
1471          * Generate $wgSecretKey. Will warn if we had to use an insecure random source.
1472          *
1473          * @return Status
1474          */
1475         public function generateKeys() {
1476                 $keys = array( 'wgSecretKey' => 64 );
1477                 if ( strval( $this->getVar( 'wgUpgradeKey' ) ) === '' ) {
1478                         $keys['wgUpgradeKey'] = 16;
1479                 }
1480                 return $this->doGenerateKeys( $keys );
1481         }
1482
1483         /**
1484          * Generate a secret value for variables using our CryptRand generator.
1485          * Produce a warning if the random source was insecure.
1486          *
1487          * @param $keys Array
1488          * @return Status
1489          */
1490         protected function doGenerateKeys( $keys ) {
1491                 $status = Status::newGood();
1492
1493                 $strong = true;
1494                 foreach ( $keys as $name => $length ) {
1495                         $secretKey = MWCryptRand::generateHex( $length, true );
1496                         if ( !MWCryptRand::wasStrong() ) {
1497                                 $strong = false;
1498                         }
1499
1500                         $this->setVar( $name, $secretKey );
1501                 }
1502
1503                 if ( !$strong ) {
1504                         $names = array_keys( $keys );
1505                         $names = preg_replace( '/^(.*)$/', '\$$1', $names );
1506                         global $wgLang;
1507                         $status->warning( 'config-insecure-keys', $wgLang->listToText( $names ), count( $names ) );
1508                 }
1509
1510                 return $status;
1511         }
1512
1513         /**
1514          * Create the first user account, grant it sysop and bureaucrat rights
1515          *
1516          * @return Status
1517          */
1518         protected function createSysop() {
1519                 $name = $this->getVar( '_AdminName' );
1520                 $user = User::newFromName( $name );
1521
1522                 if ( !$user ) {
1523                         // We should've validated this earlier anyway!
1524                         return Status::newFatal( 'config-admin-error-user', $name );
1525                 }
1526
1527                 if ( $user->idForName() == 0 ) {
1528                         $user->addToDatabase();
1529
1530                         try {
1531                                 $user->setPassword( $this->getVar( '_AdminPassword' ) );
1532                         } catch( PasswordError $pwe ) {
1533                                 return Status::newFatal( 'config-admin-error-password', $name, $pwe->getMessage() );
1534                         }
1535
1536                         $user->addGroup( 'sysop' );
1537                         $user->addGroup( 'bureaucrat' );
1538                         if( $this->getVar( '_AdminEmail' ) ) {
1539                                 $user->setEmail( $this->getVar( '_AdminEmail' ) );
1540                         }
1541                         $user->saveSettings();
1542
1543                         // Update user count
1544                         $ssUpdate = new SiteStatsUpdate( 0, 0, 0, 0, 1 );
1545                         $ssUpdate->doUpdate();
1546                 }
1547                 $status = Status::newGood();
1548
1549                 if( $this->getVar( '_Subscribe' ) && $this->getVar( '_AdminEmail' ) ) {
1550                         $this->subscribeToMediaWikiAnnounce( $status );
1551                 }
1552
1553                 return $status;
1554         }
1555
1556         /**
1557          * @param $s Status
1558          */
1559         private function subscribeToMediaWikiAnnounce( Status $s ) {
1560                 $params = array(
1561                         'email'    => $this->getVar( '_AdminEmail' ),
1562                         'language' => 'en',
1563                         'digest'   => 0
1564                 );
1565
1566                 // Mailman doesn't support as many languages as we do, so check to make
1567                 // sure their selected language is available
1568                 $myLang = $this->getVar( '_UserLang' );
1569                 if( in_array( $myLang, $this->mediaWikiAnnounceLanguages ) ) {
1570                         $myLang = $myLang == 'pt-br' ? 'pt_BR' : $myLang; // rewrite to Mailman's pt_BR
1571                         $params['language'] = $myLang;
1572                 }
1573
1574                 if( MWHttpRequest::canMakeRequests() ) {
1575                         $res = MWHttpRequest::factory( $this->mediaWikiAnnounceUrl,
1576                                 array( 'method' => 'POST', 'postData' => $params ) )->execute();
1577                         if( !$res->isOK() ) {
1578                                 $s->warning( 'config-install-subscribe-fail', $res->getMessage() );
1579                         }
1580                 } else {
1581                         $s->warning( 'config-install-subscribe-notpossible' );
1582                 }
1583         }
1584
1585         /**
1586          * Insert Main Page with default content.
1587          *
1588          * @param $installer DatabaseInstaller
1589          * @return Status
1590          */
1591         protected function createMainpage( DatabaseInstaller $installer ) {
1592                 $status = Status::newGood();
1593                 try {
1594                         $page = WikiPage::factory( Title::newMainPage() );
1595                         $content = new WikitextContent (
1596                                 wfMessage( 'mainpagetext' )->inContentLanguage()->text() . "\n\n" .
1597                                 wfMessage( 'mainpagedocfooter' )->inContentLanguage()->text()
1598                         );
1599
1600                         $page->doEditContent( $content,
1601                                         '',
1602                                         EDIT_NEW,
1603                                         false,
1604                                         User::newFromName( 'MediaWiki default' ) );
1605                 } catch (MWException $e) {
1606                         //using raw, because $wgShowExceptionDetails can not be set yet
1607                         $status->fatal( 'config-install-mainpage-failed', $e->getMessage() );
1608                 }
1609
1610                 return $status;
1611         }
1612
1613         /**
1614          * Override the necessary bits of the config to run an installation.
1615          */
1616         public static function overrideConfig() {
1617                 define( 'MW_NO_SESSION', 1 );
1618
1619                 // Don't access the database
1620                 $GLOBALS['wgUseDatabaseMessages'] = false;
1621                 // Don't cache langconv tables
1622                 $GLOBALS['wgLanguageConverterCacheType'] = CACHE_NONE;
1623                 // Debug-friendly
1624                 $GLOBALS['wgShowExceptionDetails'] = true;
1625                 // Don't break forms
1626                 $GLOBALS['wgExternalLinkTarget'] = '_blank';
1627
1628                 // Extended debugging
1629                 $GLOBALS['wgShowSQLErrors'] = true;
1630                 $GLOBALS['wgShowDBErrorBacktrace'] = true;
1631
1632                 // Allow multiple ob_flush() calls
1633                 $GLOBALS['wgDisableOutputCompression'] = true;
1634
1635                 // Use a sensible cookie prefix (not my_wiki)
1636                 $GLOBALS['wgCookiePrefix'] = 'mw_installer';
1637
1638                 // Some of the environment checks make shell requests, remove limits
1639                 $GLOBALS['wgMaxShellMemory'] = 0;
1640         }
1641
1642         /**
1643          * Add an installation step following the given step.
1644          *
1645          * @param $callback Array A valid installation callback array, in this form:
1646          *    array( 'name' => 'some-unique-name', 'callback' => array( $obj, 'function' ) );
1647          * @param $findStep String the step to find. Omit to put the step at the beginning
1648          */
1649         public function addInstallStep( $callback, $findStep = 'BEGINNING' ) {
1650                 $this->extraInstallSteps[$findStep][] = $callback;
1651         }
1652
1653         /**
1654          * Disable the time limit for execution.
1655          * Some long-running pages (Install, Upgrade) will want to do this
1656          */
1657         protected function disableTimeLimit() {
1658                 wfSuppressWarnings();
1659                 set_time_limit( 0 );
1660                 wfRestoreWarnings();
1661         }
1662 }