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                 // Give grep a chance to find the usages:
 647                 // config-type-mysql, config-type-postgres, config-type-oracle, config-type-sqlite
 648                 foreach ( self::getDBTypes() as $name ) {
 649                         $allNames[] = wfMessage( "config-type-$name" )->text();
 650                 }
 651
 652                 // cache initially available databases to make sure that everything will be displayed correctly
 653                 // after a refresh on env checks page
 654                 $databases = $this->getVar( '_CompiledDBs-preFilter' );
 655                 if ( !$databases ) {
 656                         $databases = $this->getVar( '_CompiledDBs' );
 657                         $this->setVar( '_CompiledDBs-preFilter', $databases );
 658                 }
 659
 660                 $databases = array_flip ( $databases );
 661                 foreach ( array_keys( $databases ) as $db ) {
 662                         $installer = $this->getDBInstaller( $db );
 663                         $status = $installer->checkPrerequisites();
 664                         if ( !$status->isGood() ) {
 665                                 $this->showStatusMessage( $status );
 666                         }
 667                         if ( !$status->isOK() ) {
 668                                 unset( $databases[$db] );
 669                         }
 670                 }
 671                 $databases = array_flip( $databases );
 672                 if ( !$databases ) {
 673                         $this->showError( 'config-no-db', $wgLang->commaList( $allNames ) );
 674                         // @todo FIXME: This only works for the web installer!
 675                         return false;
 676                 }
 677                 $this->setVar( '_CompiledDBs', $databases );
 678                 return true;
 679         }
 680
 681         /**
 682          * Environment check for register_globals.
 683          */
 684         protected function envCheckRegisterGlobals() {
 685                 if( wfIniGetBool( 'register_globals' ) ) {
 686                         $this->showMessage( 'config-register-globals' );
 687                 }
 688         }
 689
 690         /**
 691          * Some versions of libxml+PHP break < and > encoding horribly
 692          * @return bool
 693          */
 694         protected function envCheckBrokenXML() {
 695                 $test = new PhpXmlBugTester();
 696                 if ( !$test->ok ) {
 697                         $this->showError( 'config-brokenlibxml' );
 698                         return false;
 699                 }
 700                 return true;
 701         }
 702
 703         /**
 704          * Test PHP (probably 5.3.1, but it could regress again) to make sure that
 705          * reference parameters to __call() are not converted to null
 706          * @return bool
 707          */
 708         protected function envCheckPHP531() {
 709                 $test = new PhpRefCallBugTester;
 710                 $test->execute();
 711                 if ( !$test->ok ) {
 712                         $this->showError( 'config-using531', phpversion() );
 713                         return false;
 714                 }
 715                 return true;
 716         }
 717
 718         /**
 719          * Environment check for magic_quotes_runtime.
 720          * @return bool
 721          */
 722         protected function envCheckMagicQuotes() {
 723                 if( wfIniGetBool( "magic_quotes_runtime" ) ) {
 724                         $this->showError( 'config-magic-quotes-runtime' );
 725                         return false;
 726                 }
 727                 return true;
 728         }
 729
 730         /**
 731          * Environment check for magic_quotes_sybase.
 732          * @return bool
 733          */
 734         protected function envCheckMagicSybase() {
 735                 if ( wfIniGetBool( 'magic_quotes_sybase' ) ) {
 736                         $this->showError( 'config-magic-quotes-sybase' );
 737                         return false;
 738                 }
 739                 return true;
 740         }
 741
 742         /**
 743          * Environment check for mbstring.func_overload.
 744          * @return bool
 745          */
 746         protected function envCheckMbstring() {
 747                 if ( wfIniGetBool( 'mbstring.func_overload' ) ) {
 748                         $this->showError( 'config-mbstring' );
 749                         return false;
 750                 }
 751                 return true;
 752         }
 753
 754         /**
 755          * Environment check for zend.ze1_compatibility_mode.
 756          * @return bool
 757          */
 758         protected function envCheckZE1() {
 759                 if ( wfIniGetBool( 'zend.ze1_compatibility_mode' ) ) {
 760                         $this->showError( 'config-ze1' );
 761                         return false;
 762                 }
 763                 return true;
 764         }
 765
 766         /**
 767          * Environment check for safe_mode.
 768          * @return bool
 769          */
 770         protected function envCheckSafeMode() {
 771                 if ( wfIniGetBool( 'safe_mode' ) ) {
 772                         $this->setVar( '_SafeMode', true );
 773                         $this->showMessage( 'config-safe-mode' );
 774                 }
 775                 return true;
 776         }
 777
 778         /**
 779          * Environment check for the XML module.
 780          * @return bool
 781          */
 782         protected function envCheckXML() {
 783                 if ( !function_exists( "utf8_encode" ) ) {
 784                         $this->showError( 'config-xml-bad' );
 785                         return false;
 786                 }
 787                 return true;
 788         }
 789
 790         /**
 791          * Environment check for the PCRE module.
 792          *
 793          * @note If this check were to fail, the parser would
 794          *   probably throw an exception before the result
 795          *   of this check is shown to the user.
 796          * @return bool
 797          */
 798         protected function envCheckPCRE() {
 799                 if ( !function_exists( 'preg_match' ) ) {
 800                         $this->showError( 'config-pcre' );
 801                         return false;
 802                 }
 803                 wfSuppressWarnings();
 804                 $regexd = preg_replace( '/[\x{0430}-\x{04FF}]/iu', '', '-АБВГД-' );
 805                 // Need to check for \p support too, as PCRE can be compiled
 806                 // with utf8 support, but not unicode property support.
 807                 // check that \p{Zs} (space separators) matches
 808                 // U+3000 (Ideographic space)
 809                 $regexprop = preg_replace( '/\p{Zs}/u', '', "-\xE3\x80\x80-" );
 810                 wfRestoreWarnings();
 811                 if ( $regexd != '--' || $regexprop != '--' ) {
 812                         $this->showError( 'config-pcre-no-utf8' );
 813                         return false;
 814                 }
 815                 return true;
 816         }
 817
 818         /**
 819          * Environment check for available memory.
 820          * @return bool
 821          */
 822         protected function envCheckMemory() {
 823                 $limit = ini_get( 'memory_limit' );
 824
 825                 if ( !$limit || $limit == -1 ) {
 826                         return true;
 827                 }
 828
 829                 $n = wfShorthandToInteger( $limit );
 830
 831                 if( $n < $this->minMemorySize * 1024 * 1024 ) {
 832                         $newLimit = "{$this->minMemorySize}M";
 833
 834                         if( ini_set( "memory_limit", $newLimit ) === false ) {
 835                                 $this->showMessage( 'config-memory-bad', $limit );
 836                         } else {
 837                                 $this->showMessage( 'config-memory-raised', $limit, $newLimit );
 838                                 $this->setVar( '_RaiseMemory', true );
 839                         }
 840                 }
 841                 return true;
 842         }
 843
 844         /**
 845          * Environment check for compiled object cache types.
 846          */
 847         protected function envCheckCache() {
 848                 $caches = array();
 849                 foreach ( $this->objectCaches as $name => $function ) {
 850                         if ( function_exists( $function ) ) {
 851                                 if ( $name == 'xcache' && !wfIniGetBool( 'xcache.var_size' ) ) {
 852                                         continue;
 853                                 }
 854                                 $caches[$name] = true;
 855                         }
 856                 }
 857
 858                 if ( !$caches ) {
 859                         $this->showMessage( 'config-no-cache' );
 860                 }
 861
 862                 $this->setVar( '_Caches', $caches );
 863         }
 864
 865         /**
 866          * Scare user to death if they have mod_security
 867          * @return bool
 868          */
 869         protected function envCheckModSecurity() {
 870                 if ( self::apacheModulePresent( 'mod_security' ) ) {
 871                         $this->showMessage( 'config-mod-security' );
 872                 }
 873                 return true;
 874         }
 875
 876         /**
 877          * Search for GNU diff3.
 878          * @return bool
 879          */
 880         protected function envCheckDiff3() {
 881                 $names = array( "gdiff3", "diff3", "diff3.exe" );
 882                 $versionInfo = array( '$1 --version 2>&1', 'GNU diffutils' );
 883
 884                 $diff3 = self::locateExecutableInDefaultPaths( $names, $versionInfo );
 885
 886                 if ( $diff3 ) {
 887                         $this->setVar( 'wgDiff3', $diff3 );
 888                 } else {
 889                         $this->setVar( 'wgDiff3', false );
 890                         $this->showMessage( 'config-diff3-bad' );
 891                 }
 892                 return true;
 893         }
 894
 895         /**
 896          * Environment check for ImageMagick and GD.
 897          * @return bool
 898          */
 899         protected function envCheckGraphics() {
 900                 $names = array( wfIsWindows() ? 'convert.exe' : 'convert' );
 901                 $convert = self::locateExecutableInDefaultPaths( $names, array( '$1 -version', 'ImageMagick' ) );
 902
 903                 $this->setVar( 'wgImageMagickConvertCommand', '' );
 904                 if ( $convert ) {
 905                         $this->setVar( 'wgImageMagickConvertCommand', $convert );
 906                         $this->showMessage( 'config-imagemagick', $convert );
 907                         return true;
 908                 } elseif ( function_exists( 'imagejpeg' ) ) {
 909                         $this->showMessage( 'config-gd' );
 910
 911                 } else {
 912                         $this->showMessage( 'config-no-scaling' );
 913                 }
 914                 return true;
 915         }
 916
 917         /**
 918          * Environment check for the server hostname.
 919          */
 920         protected function envCheckServer() {
 921                 $server = $this->envGetDefaultServer();
 922                 $this->showMessage( 'config-using-server', $server );
 923                 $this->setVar( 'wgServer', $server );
 924                 return true;
 925         }
 926
 927         /**
 928          * Helper function to be called from envCheckServer()
 929          * @return String
 930          */
 931         abstract protected function envGetDefaultServer();
 932
 933         /**
 934          * Environment check for setting $IP and $wgScriptPath.
 935          * @return bool
 936          */
 937         protected function envCheckPath() {
 938                 global $IP;
 939                 $IP = dirname( dirname( __DIR__ ) );
 940                 $this->setVar( 'IP', $IP );
 941
 942                 $this->showMessage( 'config-using-uri', $this->getVar( 'wgServer' ), $this->getVar( 'wgScriptPath' ) );
 943                 return true;
 944         }
 945
 946         /**
 947          * Environment check for setting the preferred PHP file extension.
 948          */
 949         protected function envCheckExtension() {
 950                 // @todo FIXME: Detect this properly
 951                 if ( defined( 'MW_INSTALL_PHP5_EXT' ) ) {
 952                         $ext = 'php5';
 953                 } else {
 954                         $ext = 'php';
 955                 }
 956                 $this->setVar( 'wgScriptExtension', ".$ext" );
 957                 return true;
 958         }
 959
 960         /**
 961          * TODO: document
 962          * @return bool
 963          */
 964         protected function envCheckShellLocale() {
 965                 $os = php_uname( 's' );
 966                 $supported = array( 'Linux', 'SunOS', 'HP-UX', 'Darwin' ); # Tested these
 967
 968                 if ( !in_array( $os, $supported ) ) {
 969                         return true;
 970                 }
 971
 972                 # Get a list of available locales.
 973                 $ret = false;
 974                 $lines = wfShellExec( '/usr/bin/locale -a', $ret );
 975
 976                 if ( $ret ) {
 977                         return true;
 978                 }
 979
 980                 $lines = wfArrayMap( 'trim', explode( "\n", $lines ) );
 981                 $candidatesByLocale = array();
 982                 $candidatesByLang = array();
 983
 984                 foreach ( $lines as $line ) {
 985                         if ( $line === '' ) {
 986                                 continue;
 987                         }
 988
 989                         if ( !preg_match( '/^([a-zA-Z]+)(_[a-zA-Z]+|)\.(utf8|UTF-8)(@[a-zA-Z_]*|)$/i', $line, $m ) ) {
 990                                 continue;
 991                         }
 992
 993                         list( , $lang, , , ) = $m;
 994
 995                         $candidatesByLocale[$m[0]] = $m;
 996                         $candidatesByLang[$lang][] = $m;
 997                 }
 998
 999                 # Try the current value of LANG.
1000                 if ( isset( $candidatesByLocale[getenv( 'LANG' )] ) ) {
1001                         $this->setVar( 'wgShellLocale', getenv( 'LANG' ) );
1002                         return true;
1003                 }
1004
1005                 # Try the most common ones.
1006                 $commonLocales = array( 'en_US.UTF-8', 'en_US.utf8', 'de_DE.UTF-8', 'de_DE.utf8' );
1007                 foreach ( $commonLocales as $commonLocale ) {
1008                         if ( isset( $candidatesByLocale[$commonLocale] ) ) {
1009                                 $this->setVar( 'wgShellLocale', $commonLocale );
1010                                 return true;
1011                         }
1012                 }
1013
1014                 # Is there an available locale in the Wiki's language?
1015                 $wikiLang = $this->getVar( 'wgLanguageCode' );
1016
1017                 if ( isset( $candidatesByLang[$wikiLang] ) ) {
1018                         $m = reset( $candidatesByLang[$wikiLang] );
1019                         $this->setVar( 'wgShellLocale', $m[0] );
1020                         return true;
1021                 }
1022
1023                 # Are there any at all?
1024                 if ( count( $candidatesByLocale ) ) {
1025                         $m = reset( $candidatesByLocale );
1026                         $this->setVar( 'wgShellLocale', $m[0] );
1027                         return true;
1028                 }
1029
1030                 # Give up.
1031                 return true;
1032         }
1033
1034         /**
1035          * TODO: document
1036          * @return bool
1037          */
1038         protected function envCheckUploadsDirectory() {
1039                 global $IP;
1040
1041                 $dir = $IP . '/images/';
1042                 $url = $this->getVar( 'wgServer' ) . $this->getVar( 'wgScriptPath' ) . '/images/';
1043                 $safe = !$this->dirIsExecutable( $dir, $url );
1044
1045                 if ( !$safe ) {
1046                         $this->showMessage( 'config-uploads-not-safe', $dir );
1047                 }
1048                 return true;
1049         }
1050
1051         /**
1052          * Checks if suhosin.get.max_value_length is set, and if so, sets
1053          * $wgResourceLoaderMaxQueryLength to that value in the generated
1054          * LocalSettings file
1055          * @return bool
1056          */
1057         protected function envCheckSuhosinMaxValueLength() {
1058                 $maxValueLength = ini_get( 'suhosin.get.max_value_length' );
1059                 if ( $maxValueLength > 0 ) {
1060                         if( $maxValueLength < 1024 ) {
1061                                 # Only warn if the value is below the sane 1024
1062                                 $this->showMessage( 'config-suhosin-max-value-length', $maxValueLength );
1063                         }
1064                 } else {
1065                         $maxValueLength = -1;
1066                 }
1067                 $this->setVar( 'wgResourceLoaderMaxQueryLength', $maxValueLength );
1068                 return true;
1069         }
1070
1071         /**
1072          * Convert a hex string representing a Unicode code point to that code point.
1073          * @param $c String
1074          * @return string
1075          */
1076         protected function unicodeChar( $c ) {
1077                 $c = hexdec( $c );
1078                 if ( $c <= 0x7F ) {
1079                         return chr( $c );
1080                 } elseif ( $c <= 0x7FF ) {
1081                         return chr( 0xC0 | $c >> 6 ) . chr( 0x80 | $c & 0x3F );
1082                 } elseif ( $c <= 0xFFFF ) {
1083                         return chr( 0xE0 | $c >> 12 ) . chr( 0x80 | $c >> 6 & 0x3F )
1084                                 . chr( 0x80 | $c & 0x3F );
1085                 } elseif ( $c <= 0x10FFFF ) {
1086                         return chr( 0xF0 | $c >> 18 ) . chr( 0x80 | $c >> 12 & 0x3F )
1087                                 . chr( 0x80 | $c >> 6 & 0x3F )
1088                                 . chr( 0x80 | $c & 0x3F );
1089                 } else {
1090                         return false;
1091                 }
1092         }
1093
1094         /**
1095          * Check the libicu version
1096          */
1097         protected function envCheckLibicu() {
1098                 $utf8 = function_exists( 'utf8_normalize' );
1099                 $intl = function_exists( 'normalizer_normalize' );
1100
1101                 /**
1102                  * This needs to be updated something that the latest libicu
1103                  * will properly normalize.  This normalization was found at
1104                  * http://www.unicode.org/versions/Unicode5.2.0/#Character_Additions
1105                  * Note that we use the hex representation to create the code
1106                  * points in order to avoid any Unicode-destroying during transit.
1107                  */
1108                 $not_normal_c = $this->unicodeChar( "FA6C" );
1109                 $normal_c = $this->unicodeChar( "242EE" );
1110
1111                 $useNormalizer = 'php';
1112                 $needsUpdate = false;
1113
1114                 /**
1115                  * We're going to prefer the pecl extension here unless
1116                  * utf8_normalize is more up to date.
1117                  */
1118                 if( $utf8 ) {
1119                         $useNormalizer = 'utf8';
1120                         $utf8 = utf8_normalize( $not_normal_c, UtfNormal::UNORM_NFC );
1121                         if ( $utf8 !== $normal_c ) {
1122                                 $needsUpdate = true;
1123                         }
1124                 }
1125                 if( $intl ) {
1126                         $useNormalizer = 'intl';
1127                         $intl = normalizer_normalize( $not_normal_c, Normalizer::FORM_C );
1128                         if ( $intl !== $normal_c ) {
1129                                 $needsUpdate = true;
1130                         }
1131                 }
1132
1133                 // Uses messages 'config-unicode-using-php', 'config-unicode-using-utf8', 'config-unicode-using-intl'
1134                 if( $useNormalizer === 'php' ) {
1135                         $this->showMessage( 'config-unicode-pure-php-warning' );
1136                 } else {
1137                         $this->showMessage( 'config-unicode-using-' . $useNormalizer );
1138                         if( $needsUpdate ) {
1139                                 $this->showMessage( 'config-unicode-update-warning' );
1140                         }
1141                 }
1142         }
1143
1144         /**
1145          * @return bool
1146          */
1147         protected function envCheckCtype() {
1148                 if ( !function_exists( 'ctype_digit' ) ) {
1149                         $this->showError( 'config-ctype' );
1150                         return false;
1151                 }
1152                 return true;
1153         }
1154
1155         /**
1156          * Get an array of likely places we can find executables. Check a bunch
1157          * of known Unix-like defaults, as well as the PATH environment variable
1158          * (which should maybe make it work for Windows?)
1159          *
1160          * @return Array
1161          */
1162         protected static function getPossibleBinPaths() {
1163                 return array_merge(
1164                         array( '/usr/bin', '/usr/local/bin', '/opt/csw/bin',
1165                                 '/usr/gnu/bin', '/usr/sfw/bin', '/sw/bin', '/opt/local/bin' ),
1166                         explode( PATH_SEPARATOR, getenv( 'PATH' ) )
1167                 );
1168         }
1169
1170         /**
1171          * Search a path for any of the given executable names. Returns the
1172          * executable name if found. Also checks the version string returned
1173          * by each executable.
1174          *
1175          * Used only by environment checks.
1176          *
1177          * @param string $path path to search
1178          * @param array $names of executable names
1179          * @param $versionInfo Boolean false or array with two members:
1180          *               0 => Command to run for version check, with $1 for the full executable name
1181          *               1 => String to compare the output with
1182          *
1183          * If $versionInfo is not false, only executables with a version
1184          * matching $versionInfo[1] will be returned.
1185          * @return bool|string
1186          */
1187         public static function locateExecutable( $path, $names, $versionInfo = false ) {
1188                 if ( !is_array( $names ) ) {
1189                         $names = array( $names );
1190                 }
1191
1192                 foreach ( $names as $name ) {
1193                         $command = $path . DIRECTORY_SEPARATOR . $name;
1194
1195                         wfSuppressWarnings();
1196                         $file_exists = file_exists( $command );
1197                         wfRestoreWarnings();
1198
1199                         if ( $file_exists ) {
1200                                 if ( !$versionInfo ) {
1201                                         return $command;
1202                                 }
1203
1204                                 $file = str_replace( '$1', wfEscapeShellArg( $command ), $versionInfo[0] );
1205                                 if ( strstr( wfShellExec( $file ), $versionInfo[1] ) !== false ) {
1206                                         return $command;
1207                                 }
1208                         }
1209                 }
1210                 return false;
1211         }
1212
1213         /**
1214          * Same as locateExecutable(), but checks in getPossibleBinPaths() by default
1215          * @see locateExecutable()
1216          * @param $names
1217          * @param $versionInfo bool
1218          * @return bool|string
1219          */
1220         public static function locateExecutableInDefaultPaths( $names, $versionInfo = false ) {
1221                 foreach( self::getPossibleBinPaths() as $path ) {
1222                         $exe = self::locateExecutable( $path, $names, $versionInfo );
1223                         if( $exe !== false ) {
1224                                 return $exe;
1225                         }
1226                 }
1227                 return false;
1228         }
1229
1230         /**
1231          * Checks if scripts located in the given directory can be executed via the given URL.
1232          *
1233          * Used only by environment checks.
1234          * @param $dir string
1235          * @param $url string
1236          * @return bool|int|string
1237          */
1238         public function dirIsExecutable( $dir, $url ) {
1239                 $scriptTypes = array(
1240                         'php' => array(
1241                                 "<?php echo 'ex' . 'ec';",
1242                                 "#!/var/env php5\n<?php echo 'ex' . 'ec';",
1243                         ),
1244                 );
1245
1246                 // it would be good to check other popular languages here, but it'll be slow.
1247
1248                 wfSuppressWarnings();
1249
1250                 foreach ( $scriptTypes as $ext => $contents ) {
1251                         foreach ( $contents as $source ) {
1252                                 $file = 'exectest.' . $ext;
1253
1254                                 if ( !file_put_contents( $dir . $file, $source ) ) {
1255                                         break;
1256                                 }
1257
1258                                 try {
1259                                         $text = Http::get( $url . $file, array( 'timeout' => 3 ) );
1260                                 }
1261                                 catch( MWException $e ) {
1262                                         // Http::get throws with allow_url_fopen = false and no curl extension.
1263                                         $text = null;
1264                                 }
1265                                 unlink( $dir . $file );
1266
1267                                 if ( $text == 'exec' ) {
1268                                         wfRestoreWarnings();
1269                                         return $ext;
1270                                 }
1271                         }
1272                 }
1273
1274                 wfRestoreWarnings();
1275
1276                 return false;
1277         }
1278
1279         /**
1280          * Checks for presence of an Apache module. Works only if PHP is running as an Apache module, too.
1281          *
1282          * @param string $moduleName Name of module to check.
1283          * @return bool
1284          */
1285         public static function apacheModulePresent( $moduleName ) {
1286                 if ( function_exists( 'apache_get_modules' ) && in_array( $moduleName, apache_get_modules() ) ) {
1287                         return true;
1288                 }
1289                 // try it the hard way
1290                 ob_start();
1291                 phpinfo( INFO_MODULES );
1292                 $info = ob_get_clean();
1293                 return strpos( $info, $moduleName ) !== false;
1294         }
1295
1296         /**
1297          * ParserOptions are constructed before we determined the language, so fix it
1298          *
1299          * @param $lang Language
1300          */
1301         public function setParserLanguage( $lang ) {
1302                 $this->parserOptions->setTargetLanguage( $lang );
1303                 $this->parserOptions->setUserLang( $lang );
1304         }
1305
1306         /**
1307          * Overridden by WebInstaller to provide lastPage parameters.
1308          * @param $page string
1309          * @return string
1310          */
1311         protected function getDocUrl( $page ) {
1312                 return "{$_SERVER['PHP_SELF']}?page=" . urlencode( $page );
1313         }
1314
1315         /**
1316          * Finds extensions that follow the format /extensions/Name/Name.php,
1317          * and returns an array containing the value for 'Name' for each found extension.
1318          *
1319          * @return array
1320          */
1321         public function findExtensions() {
1322                 if( $this->getVar( 'IP' ) === null ) {
1323                         return array();
1324                 }
1325
1326                 $extDir = $this->getVar( 'IP' ) . '/extensions';
1327                 if ( !is_readable( $extDir ) || !is_dir( $extDir ) ) {
1328                         return array();
1329                 }
1330
1331                 $dh = opendir( $extDir );
1332                 $exts = array();
1333                 while ( ( $file = readdir( $dh ) ) !== false ) {
1334                         if( !is_dir( "$extDir/$file" ) ) {
1335                                 continue;
1336                         }
1337                         if( file_exists( "$extDir/$file/$file.php" ) ) {
1338                                 $exts[] = $file;
1339                         }
1340                 }
1341                 closedir( $dh );
1342                 natcasesort( $exts );
1343
1344                 return $exts;
1345         }
1346
1347         /**
1348          * Installs the auto-detected extensions.
1349          *
1350          * @return Status
1351          */
1352         protected function includeExtensions() {
1353                 global $IP;
1354                 $exts = $this->getVar( '_Extensions' );
1355                 $IP = $this->getVar( 'IP' );
1356
1357                 /**
1358                  * We need to include DefaultSettings before including extensions to avoid
1359                  * warnings about unset variables. However, the only thing we really
1360                  * want here is $wgHooks['LoadExtensionSchemaUpdates']. This won't work
1361                  * if the extension has hidden hook registration in $wgExtensionFunctions,
1362                  * but we're not opening that can of worms
1363                  * @see https://bugzilla.wikimedia.org/show_bug.cgi?id=26857
1364                  */
1365                 global $wgAutoloadClasses;
1366                 $wgAutoloadClasses = array();
1367
1368                 require( "$IP/includes/DefaultSettings.php" );
1369
1370                 foreach( $exts as $e ) {
1371                         require_once( "$IP/extensions/$e/$e.php" );
1372                 }
1373
1374                 $hooksWeWant = isset( $wgHooks['LoadExtensionSchemaUpdates'] ) ?
1375                         $wgHooks['LoadExtensionSchemaUpdates'] : array();
1376
1377                 // Unset everyone else's hooks. Lord knows what someone might be doing
1378                 // in ParserFirstCallInit (see bug 27171)
1379                 $GLOBALS['wgHooks'] = array( 'LoadExtensionSchemaUpdates' => $hooksWeWant );
1380
1381                 return Status::newGood();
1382         }
1383
1384         /**
1385          * Get an array of install steps. Should always be in the format of
1386          * array(
1387          *   'name'     => 'someuniquename',
1388          *   'callback' => array( $obj, 'method' ),
1389          * )
1390          * There must be a config-install-$name message defined per step, which will
1391          * be shown on install.
1392          *
1393          * @param $installer DatabaseInstaller so we can make callbacks
1394          * @return array
1395          */
1396         protected function getInstallSteps( DatabaseInstaller $installer ) {
1397                 $coreInstallSteps = array(
1398                         array( 'name' => 'database',   'callback' => array( $installer, 'setupDatabase' ) ),
1399                         array( 'name' => 'tables',     'callback' => array( $installer, 'createTables' ) ),
1400                         array( 'name' => 'interwiki',  'callback' => array( $installer, 'populateInterwikiTable' ) ),
1401                         array( 'name' => 'stats',      'callback' => array( $this, 'populateSiteStats' ) ),
1402                         array( 'name' => 'keys',       'callback' => array( $this, 'generateKeys' ) ),
1403                         array( 'name' => 'sysop',      'callback' => array( $this, 'createSysop' ) ),
1404                         array( 'name' => 'mainpage',   'callback' => array( $this, 'createMainpage' ) ),
1405                 );
1406
1407                 // Build the array of install steps starting from the core install list,
1408                 // then adding any callbacks that wanted to attach after a given step
1409                 foreach( $coreInstallSteps as $step ) {
1410                         $this->installSteps[] = $step;
1411                         if( isset( $this->extraInstallSteps[$step['name']] ) ) {
1412                                 $this->installSteps = array_merge(
1413                                         $this->installSteps,
1414                                         $this->extraInstallSteps[$step['name']]
1415                                 );
1416                         }
1417                 }
1418
1419                 // Prepend any steps that want to be at the beginning
1420                 if( isset( $this->extraInstallSteps['BEGINNING'] ) ) {
1421                         $this->installSteps = array_merge(
1422                                 $this->extraInstallSteps['BEGINNING'],
1423                                 $this->installSteps
1424                         );
1425                 }
1426
1427                 // Extensions should always go first, chance to tie into hooks and such
1428                 if( count( $this->getVar( '_Extensions' ) ) ) {
1429                         array_unshift( $this->installSteps,
1430                                 array( 'name' => 'extensions', 'callback' => array( $this, 'includeExtensions' ) )
1431                         );
1432                         $this->installSteps[] = array(
1433                                 'name' => 'extension-tables',
1434                                 'callback' => array( $installer, 'createExtensionTables' )
1435                         );
1436                 }
1437                 return $this->installSteps;
1438         }
1439
1440         /**
1441          * Actually perform the installation.
1442          *
1443          * @param array $startCB A callback array for the beginning of each step
1444          * @param array $endCB A callback array for the end of each step
1445          *
1446          * @return Array of Status objects
1447          */
1448         public function performInstallation( $startCB, $endCB ) {
1449                 $installResults = array();
1450                 $installer = $this->getDBInstaller();
1451                 $installer->preInstall();
1452                 $steps = $this->getInstallSteps( $installer );
1453                 foreach( $steps as $stepObj ) {
1454                         $name = $stepObj['name'];
1455                         call_user_func_array( $startCB, array( $name ) );
1456
1457                         // Perform the callback step
1458                         $status = call_user_func( $stepObj['callback'], $installer );
1459
1460                         // Output and save the results
1461                         call_user_func( $endCB, $name, $status );
1462                         $installResults[$name] = $status;
1463
1464                         // If we've hit some sort of fatal, we need to bail.
1465                         // Callback already had a chance to do output above.
1466                         if( !$status->isOk() ) {
1467                                 break;
1468                         }
1469                 }
1470                 if( $status->isOk() ) {
1471                         $this->setVar( '_InstallDone', true );
1472                 }
1473                 return $installResults;
1474         }
1475
1476         /**
1477          * Generate $wgSecretKey. Will warn if we had to use an insecure random source.
1478          *
1479          * @return Status
1480          */
1481         public function generateKeys() {
1482                 $keys = array( 'wgSecretKey' => 64 );
1483                 if ( strval( $this->getVar( 'wgUpgradeKey' ) ) === '' ) {
1484                         $keys['wgUpgradeKey'] = 16;
1485                 }
1486                 return $this->doGenerateKeys( $keys );
1487         }
1488
1489         /**
1490          * Generate a secret value for variables using our CryptRand generator.
1491          * Produce a warning if the random source was insecure.
1492          *
1493          * @param $keys Array
1494          * @return Status
1495          */
1496         protected function doGenerateKeys( $keys ) {
1497                 $status = Status::newGood();
1498
1499                 $strong = true;
1500                 foreach ( $keys as $name => $length ) {
1501                         $secretKey = MWCryptRand::generateHex( $length, true );
1502                         if ( !MWCryptRand::wasStrong() ) {
1503                                 $strong = false;
1504                         }
1505
1506                         $this->setVar( $name, $secretKey );
1507                 }
1508
1509                 if ( !$strong ) {
1510                         $names = array_keys( $keys );
1511                         $names = preg_replace( '/^(.*)$/', '\$$1', $names );
1512                         global $wgLang;
1513                         $status->warning( 'config-insecure-keys', $wgLang->listToText( $names ), count( $names ) );
1514                 }
1515
1516                 return $status;
1517         }
1518
1519         /**
1520          * Create the first user account, grant it sysop and bureaucrat rights
1521          *
1522          * @return Status
1523          */
1524         protected function createSysop() {
1525                 $name = $this->getVar( '_AdminName' );
1526                 $user = User::newFromName( $name );
1527
1528                 if ( !$user ) {
1529                         // We should've validated this earlier anyway!
1530                         return Status::newFatal( 'config-admin-error-user', $name );
1531                 }
1532
1533                 if ( $user->idForName() == 0 ) {
1534                         $user->addToDatabase();
1535
1536                         try {
1537                                 $user->setPassword( $this->getVar( '_AdminPassword' ) );
1538                         } catch( PasswordError $pwe ) {
1539                                 return Status::newFatal( 'config-admin-error-password', $name, $pwe->getMessage() );
1540                         }
1541
1542                         $user->addGroup( 'sysop' );
1543                         $user->addGroup( 'bureaucrat' );
1544                         if( $this->getVar( '_AdminEmail' ) ) {
1545                                 $user->setEmail( $this->getVar( '_AdminEmail' ) );
1546                         }
1547                         $user->saveSettings();
1548
1549                         // Update user count
1550                         $ssUpdate = new SiteStatsUpdate( 0, 0, 0, 0, 1 );
1551                         $ssUpdate->doUpdate();
1552                 }
1553                 $status = Status::newGood();
1554
1555                 if( $this->getVar( '_Subscribe' ) && $this->getVar( '_AdminEmail' ) ) {
1556                         $this->subscribeToMediaWikiAnnounce( $status );
1557                 }
1558
1559                 return $status;
1560         }
1561
1562         /**
1563          * @param $s Status
1564          */
1565         private function subscribeToMediaWikiAnnounce( Status $s ) {
1566                 $params = array(
1567                         'email'    => $this->getVar( '_AdminEmail' ),
1568                         'language' => 'en',
1569                         'digest'   => 0
1570                 );
1571
1572                 // Mailman doesn't support as many languages as we do, so check to make
1573                 // sure their selected language is available
1574                 $myLang = $this->getVar( '_UserLang' );
1575                 if( in_array( $myLang, $this->mediaWikiAnnounceLanguages ) ) {
1576                         $myLang = $myLang == 'pt-br' ? 'pt_BR' : $myLang; // rewrite to Mailman's pt_BR
1577                         $params['language'] = $myLang;
1578                 }
1579
1580                 if( MWHttpRequest::canMakeRequests() ) {
1581                         $res = MWHttpRequest::factory( $this->mediaWikiAnnounceUrl,
1582                                 array( 'method' => 'POST', 'postData' => $params ) )->execute();
1583                         if( !$res->isOK() ) {
1584                                 $s->warning( 'config-install-subscribe-fail', $res->getMessage() );
1585                         }
1586                 } else {
1587                         $s->warning( 'config-install-subscribe-notpossible' );
1588                 }
1589         }
1590
1591         /**
1592          * Insert Main Page with default content.
1593          *
1594          * @param $installer DatabaseInstaller
1595          * @return Status
1596          */
1597         protected function createMainpage( DatabaseInstaller $installer ) {
1598                 $status = Status::newGood();
1599                 try {
1600                         $page = WikiPage::factory( Title::newMainPage() );
1601                         $content = new WikitextContent(
1602                                 wfMessage( 'mainpagetext' )->inContentLanguage()->text() . "\n\n" .
1603                                 wfMessage( 'mainpagedocfooter' )->inContentLanguage()->text()
1604                         );
1605
1606                         $page->doEditContent( $content,
1607                                         '',
1608                                         EDIT_NEW,
1609                                         false,
1610                                         User::newFromName( 'MediaWiki default' ) );
1611                 } catch ( MWException $e ) {
1612                         //using raw, because $wgShowExceptionDetails can not be set yet
1613                         $status->fatal( 'config-install-mainpage-failed', $e->getMessage() );
1614                 }
1615
1616                 return $status;
1617         }
1618
1619         /**
1620          * Override the necessary bits of the config to run an installation.
1621          */
1622         public static function overrideConfig() {
1623                 define( 'MW_NO_SESSION', 1 );
1624
1625                 // Don't access the database
1626                 $GLOBALS['wgUseDatabaseMessages'] = false;
1627                 // Don't cache langconv tables
1628                 $GLOBALS['wgLanguageConverterCacheType'] = CACHE_NONE;
1629                 // Debug-friendly
1630                 $GLOBALS['wgShowExceptionDetails'] = true;
1631                 // Don't break forms
1632                 $GLOBALS['wgExternalLinkTarget'] = '_blank';
1633
1634                 // Extended debugging
1635                 $GLOBALS['wgShowSQLErrors'] = true;
1636                 $GLOBALS['wgShowDBErrorBacktrace'] = true;
1637
1638                 // Allow multiple ob_flush() calls
1639                 $GLOBALS['wgDisableOutputCompression'] = true;
1640
1641                 // Use a sensible cookie prefix (not my_wiki)
1642                 $GLOBALS['wgCookiePrefix'] = 'mw_installer';
1643
1644                 // Some of the environment checks make shell requests, remove limits
1645                 $GLOBALS['wgMaxShellMemory'] = 0;
1646         }
1647
1648         /**
1649          * Add an installation step following the given step.
1650          *
1651          * @param array $callback A valid installation callback array, in this form:
1652          *    array( 'name' => 'some-unique-name', 'callback' => array( $obj, 'function' ) );
1653          * @param string $findStep the step to find. Omit to put the step at the beginning
1654          */
1655         public function addInstallStep( $callback, $findStep = 'BEGINNING' ) {
1656                 $this->extraInstallSteps[$findStep][] = $callback;
1657         }
1658
1659         /**
1660          * Disable the time limit for execution.
1661          * Some long-running pages (Install, Upgrade) will want to do this
1662          */
1663         protected function disableTimeLimit() {
1664                 wfSuppressWarnings();
1665                 set_time_limit( 0 );
1666                 wfRestoreWarnings();
1667         }
1668 }