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         /**
  51          * List of detected DBs, access using getCompiledDBs().
  52          *
  53          * @var array
  54          */
  55         protected $compiledDBs;
  56
  57         /**
  58          * Cached DB installer instances, access using getDBInstaller().
  59          *
  60          * @var array
  61          */
  62         protected $dbInstallers = array();
  63
  64         /**
  65          * Minimum memory size in MB.
  66          *
  67          * @var integer
  68          */
  69         protected $minMemorySize = 50;
  70
  71         /**
  72          * Cached Title, used by parse().
  73          *
  74          * @var Title
  75          */
  76         protected $parserTitle;
  77
  78         /**
  79          * Cached ParserOptions, used by parse().
  80          *
  81          * @var ParserOptions
  82          */
  83         protected $parserOptions;
  84
  85         /**
  86          * Known database types. These correspond to the class names <type>Installer,
  87          * and are also MediaWiki database types valid for $wgDBtype.
  88          *
  89          * To add a new type, create a <type>Installer class and a Database<type>
  90          * class, and add a config-type-<type> message to MessagesEn.php.
  91          *
  92          * @var array
  93          */
  94         protected static $dbTypes = array(
  95                 'mysql',
  96                 'postgres',
  97                 'oracle',
  98                 'sqlite',
  99         );
 100
 101         /**
 102          * A list of environment check methods called by doEnvironmentChecks().
 103          * These may output warnings using showMessage(), and/or abort the
 104          * installation process by returning false.
 105          *
 106          * @var array
 107          */
 108         protected $envChecks = array(
 109                 'envCheckDB',
 110                 'envCheckRegisterGlobals',
 111                 'envCheckBrokenXML',
 112                 'envCheckPHP531',
 113                 'envCheckMagicQuotes',
 114                 'envCheckMagicSybase',
 115                 'envCheckMbstring',
 116                 'envCheckZE1',
 117                 'envCheckSafeMode',
 118                 'envCheckXML',
 119                 'envCheckPCRE',
 120                 'envCheckMemory',
 121                 'envCheckCache',
 122                 'envCheckModSecurity',
 123                 'envCheckDiff3',
 124                 'envCheckGraphics',
 125                 'envCheckGit',
 126                 'envCheckServer',
 127                 'envCheckPath',
 128                 'envCheckExtension',
 129                 'envCheckShellLocale',
 130                 'envCheckUploadsDirectory',
 131                 'envCheckLibicu',
 132                 'envCheckSuhosinMaxValueLength',
 133                 'envCheckCtype',
 134                 'envCheckJSON',
 135         );
 136
 137         /**
 138          * MediaWiki configuration globals that will eventually be passed through
 139          * to LocalSettings.php. The names only are given here, the defaults
 140          * typically come from DefaultSettings.php.
 141          *
 142          * @var array
 143          */
 144         protected $defaultVarNames = array(
 145                 'wgSitename',
 146                 'wgPasswordSender',
 147                 'wgLanguageCode',
 148                 'wgRightsIcon',
 149                 'wgRightsText',
 150                 'wgRightsUrl',
 151                 'wgMainCacheType',
 152                 'wgEnableEmail',
 153                 'wgEnableUserEmail',
 154                 'wgEnotifUserTalk',
 155                 'wgEnotifWatchlist',
 156                 'wgEmailAuthentication',
 157                 'wgDBtype',
 158                 'wgDiff3',
 159                 'wgImageMagickConvertCommand',
 160                 'wgGitBin',
 161                 'IP',
 162                 'wgServer',
 163                 'wgScriptPath',
 164                 'wgScriptExtension',
 165                 'wgMetaNamespace',
 166                 'wgDeletedDirectory',
 167                 'wgEnableUploads',
 168                 'wgLogo',
 169                 'wgShellLocale',
 170                 'wgSecretKey',
 171                 'wgUseInstantCommons',
 172                 'wgUpgradeKey',
 173                 'wgDefaultSkin',
 174                 'wgResourceLoaderMaxQueryLength',
 175         );
 176
 177         /**
 178          * Variables that are stored alongside globals, and are used for any
 179          * configuration of the installation process aside from the MediaWiki
 180          * configuration. Map of names to defaults.
 181          *
 182          * @var array
 183          */
 184         protected $internalDefaults = array(
 185                 '_UserLang' => 'en',
 186                 '_Environment' => false,
 187                 '_SafeMode' => false,
 188                 '_RaiseMemory' => false,
 189                 '_UpgradeDone' => false,
 190                 '_InstallDone' => false,
 191                 '_Caches' => array(),
 192                 '_InstallPassword' => '',
 193                 '_SameAccount' => true,
 194                 '_CreateDBAccount' => false,
 195                 '_NamespaceType' => 'site-name',
 196                 '_AdminName' => '', // will be set later, when the user selects language
 197                 '_AdminPassword' => '',
 198                 '_AdminPassword2' => '',
 199                 '_AdminEmail' => '',
 200                 '_Subscribe' => false,
 201                 '_SkipOptional' => 'continue',
 202                 '_RightsProfile' => 'wiki',
 203                 '_LicenseCode' => 'none',
 204                 '_CCDone' => false,
 205                 '_Extensions' => array(),
 206                 '_MemCachedServers' => '',
 207                 '_UpgradeKeySupplied' => false,
 208                 '_ExistingDBSettings' => false,
 209         );
 210
 211         /**
 212          * The actual list of installation steps. This will be initialized by getInstallSteps()
 213          *
 214          * @var array
 215          */
 216         private $installSteps = array();
 217
 218         /**
 219          * Extra steps for installation, for things like DatabaseInstallers to modify
 220          *
 221          * @var array
 222          */
 223         protected $extraInstallSteps = array();
 224
 225         /**
 226          * Known object cache types and the functions used to test for their existence.
 227          *
 228          * @var array
 229          */
 230         protected $objectCaches = array(
 231                 'xcache' => 'xcache_get',
 232                 'apc' => 'apc_fetch',
 233                 'wincache' => 'wincache_ucache_get'
 234         );
 235
 236         /**
 237          * User rights profiles.
 238          *
 239          * @var array
 240          */
 241         public $rightsProfiles = array(
 242                 'wiki' => array(),
 243                 'no-anon' => array(
 244                         '*' => array( 'edit' => false )
 245                 ),
 246                 'fishbowl' => array(
 247                         '*' => array(
 248                                 'createaccount' => false,
 249                                 'edit' => false,
 250                         ),
 251                 ),
 252                 'private' => array(
 253                         '*' => array(
 254                                 'createaccount' => false,
 255                                 'edit' => false,
 256                                 'read' => false,
 257                         ),
 258                 ),
 259         );
 260
 261         /**
 262          * License types.
 263          *
 264          * @var array
 265          */
 266         public $licenses = array(
 267                 'cc-by' => array(
 268                         'url' => 'http://creativecommons.org/licenses/by/3.0/',
 269                         'icon' => '{$wgStylePath}/common/images/cc-by.png',
 270                 ),
 271                 'cc-by-sa' => array(
 272                         'url' => 'http://creativecommons.org/licenses/by-sa/3.0/',
 273                         'icon' => '{$wgStylePath}/common/images/cc-by-sa.png',
 274                 ),
 275                 'cc-by-nc-sa' => array(
 276                         'url' => 'http://creativecommons.org/licenses/by-nc-sa/3.0/',
 277                         'icon' => '{$wgStylePath}/common/images/cc-by-nc-sa.png',
 278                 ),
 279                 'cc-0' => array(
 280                         'url' => 'https://creativecommons.org/publicdomain/zero/1.0/',
 281                         'icon' => '{$wgStylePath}/common/images/cc-0.png',
 282                 ),
 283                 'pd' => array(
 284                         'url' => '',
 285                         'icon' => '{$wgStylePath}/common/images/public-domain.png',
 286                 ),
 287                 'gfdl' => array(
 288                         'url' => 'http://www.gnu.org/copyleft/fdl.html',
 289                         'icon' => '{$wgStylePath}/common/images/gnu-fdl.png',
 290                 ),
 291                 'none' => array(
 292                         'url' => '',
 293                         'icon' => '',
 294                         'text' => ''
 295                 ),
 296                 'cc-choose' => array(
 297                         // Details will be filled in by the selector.
 298                         'url' => '',
 299                         'icon' => '',
 300                         'text' => '',
 301                 ),
 302         );
 303
 304         /**
 305          * URL to mediawiki-announce subscription
 306          */
 307         protected $mediaWikiAnnounceUrl = 'https://lists.wikimedia.org/mailman/subscribe/mediawiki-announce';
 308
 309         /**
 310          * Supported language codes for Mailman
 311          */
 312         protected $mediaWikiAnnounceLanguages = array(
 313                 'ca', 'cs', 'da', 'de', 'en', 'es', 'et', 'eu', 'fi', 'fr', 'hr', 'hu',
 314                 'it', 'ja', 'ko', 'lt', 'nl', 'no', 'pl', 'pt', 'pt-br', 'ro', 'ru',
 315                 'sl', 'sr', 'sv', 'tr', 'uk'
 316         );
 317
 318         /**
 319          * UI interface for displaying a short message
 320          * The parameters are like parameters to wfMessage().
 321          * The messages will be in wikitext format, which will be converted to an
 322          * output format such as HTML or text before being sent to the user.
 323          * @param $msg
 324          */
 325         abstract public function showMessage( $msg /*, ... */ );
 326
 327         /**
 328          * Same as showMessage(), but for displaying errors
 329          * @param $msg
 330          */
 331         abstract public function showError( $msg /*, ... */ );
 332
 333         /**
 334          * Show a message to the installing user by using a Status object
 335          * @param $status Status
 336          */
 337         abstract public function showStatusMessage( Status $status );
 338
 339         /**
 340          * Constructor, always call this from child classes.
 341          */
 342         public function __construct() {
 343                 global $wgExtensionMessagesFiles, $wgUser;
 344
 345                 // Disable the i18n cache and LoadBalancer
 346                 Language::getLocalisationCache()->disableBackend();
 347                 LBFactory::disableBackend();
 348
 349                 // Load the installer's i18n file.
 350                 $wgExtensionMessagesFiles['MediawikiInstaller'] =
 351                         __DIR__ . '/Installer.i18n.php';
 352
 353                 // Having a user with id = 0 safeguards us from DB access via User::loadOptions().
 354                 $wgUser = User::newFromId( 0 );
 355
 356                 $this->settings = $this->internalDefaults;
 357
 358                 foreach ( $this->defaultVarNames as $var ) {
 359                         $this->settings[$var] = $GLOBALS[$var];
 360                 }
 361
 362                 $compiledDBs = array();
 363                 foreach ( self::getDBTypes() as $type ) {
 364                         $installer = $this->getDBInstaller( $type );
 365
 366                         if ( !$installer->isCompiled() ) {
 367                                 continue;
 368                         }
 369                         $compiledDBs[] = $type;
 370
 371                         $defaults = $installer->getGlobalDefaults();
 372
 373                         foreach ( $installer->getGlobalNames() as $var ) {
 374                                 if ( isset( $defaults[$var] ) ) {
 375                                         $this->settings[$var] = $defaults[$var];
 376                                 } else {
 377                                         $this->settings[$var] = $GLOBALS[$var];
 378                                 }
 379                         }
 380                 }
 381                 $this->compiledDBs = $compiledDBs;
 382
 383                 $this->parserTitle = Title::newFromText( 'Installer' );
 384                 $this->parserOptions = new ParserOptions; // language will  be wrong :(
 385                 $this->parserOptions->setEditSection( false );
 386         }
 387
 388         /**
 389          * Get a list of known DB types.
 390          *
 391          * @return array
 392          */
 393         public static function getDBTypes() {
 394                 return self::$dbTypes;
 395         }
 396
 397         /**
 398          * Do initial checks of the PHP environment. Set variables according to
 399          * the observed environment.
 400          *
 401          * It's possible that this may be called under the CLI SAPI, not the SAPI
 402          * that the wiki will primarily run under. In that case, the subclass should
 403          * initialise variables such as wgScriptPath, before calling this function.
 404          *
 405          * Under the web subclass, it can already be assumed that PHP 5+ is in use
 406          * and that sessions are working.
 407          *
 408          * @return Status
 409          */
 410         public function doEnvironmentChecks() {
 411                 $phpVersion = phpversion();
 412                 if ( version_compare( $phpVersion, self::MINIMUM_PHP_VERSION, '>=' ) ) {
 413                         $this->showMessage( 'config-env-php', $phpVersion );
 414                         $good = true;
 415                 } else {
 416                         $this->showMessage( 'config-env-php-toolow', $phpVersion, self::MINIMUM_PHP_VERSION );
 417                         $good = false;
 418                 }
 419
 420                 if ( $good ) {
 421                         foreach ( $this->envChecks as $check ) {
 422                                 $status = $this->$check();
 423                                 if ( $status === false ) {
 424                                         $good = false;
 425                                 }
 426                         }
 427                 }
 428
 429                 $this->setVar( '_Environment', $good );
 430
 431                 return $good ? Status::newGood() : Status::newFatal( 'config-env-bad' );
 432         }
 433
 434         /**
 435          * Set a MW configuration variable, or internal installer configuration variable.
 436          *
 437          * @param $name String
 438          * @param $value Mixed
 439          */
 440         public function setVar( $name, $value ) {
 441                 $this->settings[$name] = $value;
 442         }
 443
 444         /**
 445          * Get an MW configuration variable, or internal installer configuration variable.
 446          * The defaults come from $GLOBALS (ultimately DefaultSettings.php).
 447          * Installer variables are typically prefixed by an underscore.
 448          *
 449          * @param $name String
 450          * @param $default Mixed
 451          *
 452          * @return mixed
 453          */
 454         public function getVar( $name, $default = null ) {
 455                 if ( !isset( $this->settings[$name] ) ) {
 456                         return $default;
 457                 } else {
 458                         return $this->settings[$name];
 459                 }
 460         }
 461
 462         /**
 463          * Get a list of DBs supported by current PHP setup
 464          *
 465          * @return array
 466          */
 467         public function getCompiledDBs() {
 468                 return $this->compiledDBs;
 469         }
 470
 471         /**
 472          * Get an instance of DatabaseInstaller for the specified DB type.
 473          *
 474          * @param $type Mixed: DB installer for which is needed, false to use default.
 475          *
 476          * @return DatabaseInstaller
 477          */
 478         public function getDBInstaller( $type = false ) {
 479                 if ( !$type ) {
 480                         $type = $this->getVar( 'wgDBtype' );
 481                 }
 482
 483                 $type = strtolower( $type );
 484
 485                 if ( !isset( $this->dbInstallers[$type] ) ) {
 486                         $class = ucfirst( $type ) . 'Installer';
 487                         $this->dbInstallers[$type] = new $class( $this );
 488                 }
 489
 490                 return $this->dbInstallers[$type];
 491         }
 492
 493         /**
 494          * Determine if LocalSettings.php exists. If it does, return its variables,
 495          * merged with those from AdminSettings.php, as an array.
 496          *
 497          * @return Array
 498          */
 499         public static function getExistingLocalSettings() {
 500                 global $IP;
 501
 502                 wfSuppressWarnings();
 503                 $_lsExists = file_exists( "$IP/LocalSettings.php" );
 504                 wfRestoreWarnings();
 505
 506                 if ( !$_lsExists ) {
 507                         return false;
 508                 }
 509                 unset( $_lsExists );
 510
 511                 require "$IP/includes/DefaultSettings.php";
 512                 require "$IP/LocalSettings.php";
 513                 if ( file_exists( "$IP/AdminSettings.php" ) ) {
 514                         require "$IP/AdminSettings.php";
 515                 }
 516                 return get_defined_vars();
 517         }
 518
 519         /**
 520          * Get a fake password for sending back to the user in HTML.
 521          * This is a security mechanism to avoid compromise of the password in the
 522          * event of session ID compromise.
 523          *
 524          * @param $realPassword String
 525          *
 526          * @return string
 527          */
 528         public function getFakePassword( $realPassword ) {
 529                 return str_repeat( '*', strlen( $realPassword ) );
 530         }
 531
 532         /**
 533          * Set a variable which stores a password, except if the new value is a
 534          * fake password in which case leave it as it is.
 535          *
 536          * @param $name String
 537          * @param $value Mixed
 538          */
 539         public function setPassword( $name, $value ) {
 540                 if ( !preg_match( '/^\*+$/', $value ) ) {
 541                         $this->setVar( $name, $value );
 542                 }
 543         }
 544
 545         /**
 546          * On POSIX systems return the primary group of the webserver we're running under.
 547          * On other systems just returns null.
 548          *
 549          * This is used to advice the user that he should chgrp his mw-config/data/images directory as the
 550          * webserver user before he can install.
 551          *
 552          * Public because SqliteInstaller needs it, and doesn't subclass Installer.
 553          *
 554          * @return mixed
 555          */
 556         public static function maybeGetWebserverPrimaryGroup() {
 557                 if ( !function_exists( 'posix_getegid' ) || !function_exists( 'posix_getpwuid' ) ) {
 558                         # I don't know this, this isn't UNIX.
 559                         return null;
 560                 }
 561
 562                 # posix_getegid() *not* getmygid() because we want the group of the webserver,
 563                 # not whoever owns the current script.
 564                 $gid = posix_getegid();
 565                 $getpwuid = posix_getpwuid( $gid );
 566                 $group = $getpwuid['name'];
 567
 568                 return $group;
 569         }
 570
 571         /**
 572          * Convert wikitext $text to HTML.
 573          *
 574          * This is potentially error prone since many parser features require a complete
 575          * installed MW database. The solution is to just not use those features when you
 576          * write your messages. This appears to work well enough. Basic formatting and
 577          * external links work just fine.
 578          *
 579          * But in case a translator decides to throw in a "#ifexist" or internal link or
 580          * whatever, this function is guarded to catch the attempted DB access and to present
 581          * some fallback text.
 582          *
 583          * @param $text String
 584          * @param $lineStart Boolean
 585          * @return String
 586          */
 587         public function parse( $text, $lineStart = false ) {
 588                 global $wgParser;
 589
 590                 try {
 591                         $out = $wgParser->parse( $text, $this->parserTitle, $this->parserOptions, $lineStart );
 592                         $html = $out->getText();
 593                 } catch ( DBAccessError $e ) {
 594                         $html = '<!--DB access attempted during parse-->  ' . htmlspecialchars( $text );
 595
 596                         if ( !empty( $this->debug ) ) {
 597                                 $html .= "<!--\n" . $e->getTraceAsString() . "\n-->";
 598                         }
 599                 }
 600
 601                 return $html;
 602         }
 603
 604         /**
 605          * @return ParserOptions
 606          */
 607         public function getParserOptions() {
 608                 return $this->parserOptions;
 609         }
 610
 611         public function disableLinkPopups() {
 612                 $this->parserOptions->setExternalLinkTarget( false );
 613         }
 614
 615         public function restoreLinkPopups() {
 616                 global $wgExternalLinkTarget;
 617                 $this->parserOptions->setExternalLinkTarget( $wgExternalLinkTarget );
 618         }
 619
 620         /**
 621          * Install step which adds a row to the site_stats table with appropriate
 622          * initial values.
 623          *
 624          * @param $installer DatabaseInstaller
 625          *
 626          * @return Status
 627          */
 628         public function populateSiteStats( DatabaseInstaller $installer ) {
 629                 $status = $installer->getConnection();
 630                 if ( !$status->isOK() ) {
 631                         return $status;
 632                 }
 633                 $status->value->insert( 'site_stats', array(
 634                         'ss_row_id' => 1,
 635                         'ss_total_views' => 0,
 636                         'ss_total_edits' => 0,
 637                         'ss_good_articles' => 0,
 638                         'ss_total_pages' => 0,
 639                         'ss_users' => 0,
 640                         'ss_images' => 0 ),
 641                         __METHOD__, 'IGNORE' );
 642                 return Status::newGood();
 643         }
 644
 645         /**
 646          * Exports all wg* variables stored by the installer into global scope.
 647          */
 648         public function exportVars() {
 649                 foreach ( $this->settings as $name => $value ) {
 650                         if ( substr( $name, 0, 2 ) == 'wg' ) {
 651                                 $GLOBALS[$name] = $value;
 652                         }
 653                 }
 654         }
 655
 656         /**
 657          * Environment check for DB types.
 658          * @return bool
 659          */
 660         protected function envCheckDB() {
 661                 global $wgLang;
 662
 663                 $allNames = array();
 664
 665                 // Messages: config-type-mysql, config-type-postgres, config-type-oracle,
 666                 // config-type-sqlite
 667                 foreach ( self::getDBTypes() as $name ) {
 668                         $allNames[] = wfMessage( "config-type-$name" )->text();
 669                 }
 670
 671                 $databases = $this->getCompiledDBs();
 672
 673                 $databases = array_flip ( $databases );
 674                 foreach ( array_keys( $databases ) as $db ) {
 675                         $installer = $this->getDBInstaller( $db );
 676                         $status = $installer->checkPrerequisites();
 677                         if ( !$status->isGood() ) {
 678                                 $this->showStatusMessage( $status );
 679                         }
 680                         if ( !$status->isOK() ) {
 681                                 unset( $databases[$db] );
 682                         }
 683                 }
 684                 $databases = array_flip( $databases );
 685                 if ( !$databases ) {
 686                         $this->showError( 'config-no-db', $wgLang->commaList( $allNames ) );
 687                         // @todo FIXME: This only works for the web installer!
 688                         return false;
 689                 }
 690                 return true;
 691         }
 692
 693         /**
 694          * Environment check for register_globals.
 695          */
 696         protected function envCheckRegisterGlobals() {
 697                 if ( wfIniGetBool( 'register_globals' ) ) {
 698                         $this->showMessage( 'config-register-globals' );
 699                 }
 700         }
 701
 702         /**
 703          * Some versions of libxml+PHP break < and > encoding horribly
 704          * @return bool
 705          */
 706         protected function envCheckBrokenXML() {
 707                 $test = new PhpXmlBugTester();
 708                 if ( !$test->ok ) {
 709                         $this->showError( 'config-brokenlibxml' );
 710                         return false;
 711                 }
 712                 return true;
 713         }
 714
 715         /**
 716          * Test PHP (probably 5.3.1, but it could regress again) to make sure that
 717          * reference parameters to __call() are not converted to null
 718          * @return bool
 719          */
 720         protected function envCheckPHP531() {
 721                 $test = new PhpRefCallBugTester;
 722                 $test->execute();
 723                 if ( !$test->ok ) {
 724                         $this->showError( 'config-using531', phpversion() );
 725                         return false;
 726                 }
 727                 return true;
 728         }
 729
 730         /**
 731          * Environment check for magic_quotes_runtime.
 732          * @return bool
 733          */
 734         protected function envCheckMagicQuotes() {
 735                 if ( wfIniGetBool( "magic_quotes_runtime" ) ) {
 736                         $this->showError( 'config-magic-quotes-runtime' );
 737                         return false;
 738                 }
 739                 return true;
 740         }
 741
 742         /**
 743          * Environment check for magic_quotes_sybase.
 744          * @return bool
 745          */
 746         protected function envCheckMagicSybase() {
 747                 if ( wfIniGetBool( 'magic_quotes_sybase' ) ) {
 748                         $this->showError( 'config-magic-quotes-sybase' );
 749                         return false;
 750                 }
 751                 return true;
 752         }
 753
 754         /**
 755          * Environment check for mbstring.func_overload.
 756          * @return bool
 757          */
 758         protected function envCheckMbstring() {
 759                 if ( wfIniGetBool( 'mbstring.func_overload' ) ) {
 760                         $this->showError( 'config-mbstring' );
 761                         return false;
 762                 }
 763                 return true;
 764         }
 765
 766         /**
 767          * Environment check for zend.ze1_compatibility_mode.
 768          * @return bool
 769          */
 770         protected function envCheckZE1() {
 771                 if ( wfIniGetBool( 'zend.ze1_compatibility_mode' ) ) {
 772                         $this->showError( 'config-ze1' );
 773                         return false;
 774                 }
 775                 return true;
 776         }
 777
 778         /**
 779          * Environment check for safe_mode.
 780          * @return bool
 781          */
 782         protected function envCheckSafeMode() {
 783                 if ( wfIniGetBool( 'safe_mode' ) ) {
 784                         $this->setVar( '_SafeMode', true );
 785                         $this->showMessage( 'config-safe-mode' );
 786                 }
 787                 return true;
 788         }
 789
 790         /**
 791          * Environment check for the XML module.
 792          * @return bool
 793          */
 794         protected function envCheckXML() {
 795                 if ( !function_exists( "utf8_encode" ) ) {
 796                         $this->showError( 'config-xml-bad' );
 797                         return false;
 798                 }
 799                 return true;
 800         }
 801
 802         /**
 803          * Environment check for the PCRE module.
 804          *
 805          * @note If this check were to fail, the parser would
 806          *   probably throw an exception before the result
 807          *   of this check is shown to the user.
 808          * @return bool
 809          */
 810         protected function envCheckPCRE() {
 811                 if ( !function_exists( 'preg_match' ) ) {
 812                         $this->showError( 'config-pcre' );
 813                         return false;
 814                 }
 815                 wfSuppressWarnings();
 816                 $regexd = preg_replace( '/[\x{0430}-\x{04FF}]/iu', '', '-АБВГД-' );
 817                 // Need to check for \p support too, as PCRE can be compiled
 818                 // with utf8 support, but not unicode property support.
 819                 // check that \p{Zs} (space separators) matches
 820                 // U+3000 (Ideographic space)
 821                 $regexprop = preg_replace( '/\p{Zs}/u', '', "-\xE3\x80\x80-" );
 822                 wfRestoreWarnings();
 823                 if ( $regexd != '--' || $regexprop != '--' ) {
 824                         $this->showError( 'config-pcre-no-utf8' );
 825                         return false;
 826                 }
 827                 return true;
 828         }
 829
 830         /**
 831          * Environment check for available memory.
 832          * @return bool
 833          */
 834         protected function envCheckMemory() {
 835                 $limit = ini_get( 'memory_limit' );
 836
 837                 if ( !$limit || $limit == -1 ) {
 838                         return true;
 839                 }
 840
 841                 $n = wfShorthandToInteger( $limit );
 842
 843                 if ( $n < $this->minMemorySize * 1024 * 1024 ) {
 844                         $newLimit = "{$this->minMemorySize}M";
 845
 846                         if ( ini_set( "memory_limit", $newLimit ) === false ) {
 847                                 $this->showMessage( 'config-memory-bad', $limit );
 848                         } else {
 849                                 $this->showMessage( 'config-memory-raised', $limit, $newLimit );
 850                                 $this->setVar( '_RaiseMemory', true );
 851                         }
 852                 }
 853                 return true;
 854         }
 855
 856         /**
 857          * Environment check for compiled object cache types.
 858          */
 859         protected function envCheckCache() {
 860                 $caches = array();
 861                 foreach ( $this->objectCaches as $name => $function ) {
 862                         if ( function_exists( $function ) ) {
 863                                 if ( $name == 'xcache' && !wfIniGetBool( 'xcache.var_size' ) ) {
 864                                         continue;
 865                                 }
 866                                 $caches[$name] = true;
 867                         }
 868                 }
 869
 870                 if ( !$caches ) {
 871                         $this->showMessage( 'config-no-cache' );
 872                 }
 873
 874                 $this->setVar( '_Caches', $caches );
 875         }
 876
 877         /**
 878          * Scare user to death if they have mod_security
 879          * @return bool
 880          */
 881         protected function envCheckModSecurity() {
 882                 if ( self::apacheModulePresent( 'mod_security' ) ) {
 883                         $this->showMessage( 'config-mod-security' );
 884                 }
 885                 return true;
 886         }
 887
 888         /**
 889          * Search for GNU diff3.
 890          * @return bool
 891          */
 892         protected function envCheckDiff3() {
 893                 $names = array( "gdiff3", "diff3", "diff3.exe" );
 894                 $versionInfo = array( '$1 --version 2>&1', 'GNU diffutils' );
 895
 896                 $diff3 = self::locateExecutableInDefaultPaths( $names, $versionInfo );
 897
 898                 if ( $diff3 ) {
 899                         $this->setVar( 'wgDiff3', $diff3 );
 900                 } else {
 901                         $this->setVar( 'wgDiff3', false );
 902                         $this->showMessage( 'config-diff3-bad' );
 903                 }
 904                 return true;
 905         }
 906
 907         /**
 908          * Environment check for ImageMagick and GD.
 909          * @return bool
 910          */
 911         protected function envCheckGraphics() {
 912                 $names = array( wfIsWindows() ? 'convert.exe' : 'convert' );
 913                 $versionInfo = array( '$1 -version', 'ImageMagick' );
 914                 $convert = self::locateExecutableInDefaultPaths( $names, $versionInfo );
 915
 916                 $this->setVar( 'wgImageMagickConvertCommand', '' );
 917                 if ( $convert ) {
 918                         $this->setVar( 'wgImageMagickConvertCommand', $convert );
 919                         $this->showMessage( 'config-imagemagick', $convert );
 920                         return true;
 921                 } elseif ( function_exists( 'imagejpeg' ) ) {
 922                         $this->showMessage( 'config-gd' );
 923
 924                 } else {
 925                         $this->showMessage( 'config-no-scaling' );
 926                 }
 927                 return true;
 928         }
 929
 930         /**
 931          * Search for git.
 932          *
 933          * @since 1.22
 934          * @return bool
 935          */
 936         protected function envCheckGit() {
 937                 $names = array( wfIsWindows() ? 'git.exe' : 'git' );
 938                 $versionInfo = array( '$1 --version', 'git version' );
 939
 940                 $git = self::locateExecutableInDefaultPaths( $names, $versionInfo );
 941
 942                 if ( $git ) {
 943                         $this->setVar( 'wgGitBin', $git );
 944                         $this->showMessage( 'config-git', $git );
 945                 } else {
 946                         $this->setVar( 'wgGitBin', false );
 947                         $this->showMessage( 'config-git-bad' );
 948                 }
 949                 return true;
 950         }
 951
 952         /**
 953          * Environment check for the server hostname.
 954          */
 955         protected function envCheckServer() {
 956                 $server = $this->envGetDefaultServer();
 957                 $this->showMessage( 'config-using-server', $server );
 958                 $this->setVar( 'wgServer', $server );
 959                 return true;
 960         }
 961
 962         /**
 963          * Helper function to be called from envCheckServer()
 964          * @return String
 965          */
 966         abstract protected function envGetDefaultServer();
 967
 968         /**
 969          * Environment check for setting $IP and $wgScriptPath.
 970          * @return bool
 971          */
 972         protected function envCheckPath() {
 973                 global $IP;
 974                 $IP = dirname( dirname( __DIR__ ) );
 975                 $this->setVar( 'IP', $IP );
 976
 977                 $this->showMessage( 'config-using-uri', $this->getVar( 'wgServer' ), $this->getVar( 'wgScriptPath' ) );
 978                 return true;
 979         }
 980
 981         /**
 982          * Environment check for setting the preferred PHP file extension.
 983          * @return bool
 984          */
 985         protected function envCheckExtension() {
 986                 // @todo FIXME: Detect this properly
 987                 if ( defined( 'MW_INSTALL_PHP5_EXT' ) ) {
 988                         $ext = 'php5';
 989                 } else {
 990                         $ext = 'php';
 991                 }
 992                 $this->setVar( 'wgScriptExtension', ".$ext" );
 993                 return true;
 994         }
 995
 996         /**
 997          * Environment check for preferred locale in shell
 998          * @return bool
 999          */
1000         protected function envCheckShellLocale() {
1001                 $os = php_uname( 's' );
1002                 $supported = array( 'Linux', 'SunOS', 'HP-UX', 'Darwin' ); # Tested these
1003
1004                 if ( !in_array( $os, $supported ) ) {
1005                         return true;
1006                 }
1007
1008                 # Get a list of available locales.
1009                 $ret = false;
1010                 $lines = wfShellExec( '/usr/bin/locale -a', $ret );
1011
1012                 if ( $ret ) {
1013                         return true;
1014                 }
1015
1016                 $lines = array_map( 'trim', explode( "\n", $lines ) );
1017                 $candidatesByLocale = array();
1018                 $candidatesByLang = array();
1019
1020                 foreach ( $lines as $line ) {
1021                         if ( $line === '' ) {
1022                                 continue;
1023                         }
1024
1025                         if ( !preg_match( '/^([a-zA-Z]+)(_[a-zA-Z]+|)\.(utf8|UTF-8)(@[a-zA-Z_]*|)$/i', $line, $m ) ) {
1026                                 continue;
1027                         }
1028
1029                         list( , $lang, , , ) = $m;
1030
1031                         $candidatesByLocale[$m[0]] = $m;
1032                         $candidatesByLang[$lang][] = $m;
1033                 }
1034
1035                 # Try the current value of LANG.
1036                 if ( isset( $candidatesByLocale[getenv( 'LANG' )] ) ) {
1037                         $this->setVar( 'wgShellLocale', getenv( 'LANG' ) );
1038                         return true;
1039                 }
1040
1041                 # Try the most common ones.
1042                 $commonLocales = array( 'en_US.UTF-8', 'en_US.utf8', 'de_DE.UTF-8', 'de_DE.utf8' );
1043                 foreach ( $commonLocales as $commonLocale ) {
1044                         if ( isset( $candidatesByLocale[$commonLocale] ) ) {
1045                                 $this->setVar( 'wgShellLocale', $commonLocale );
1046                                 return true;
1047                         }
1048                 }
1049
1050                 # Is there an available locale in the Wiki's language?
1051                 $wikiLang = $this->getVar( 'wgLanguageCode' );
1052
1053                 if ( isset( $candidatesByLang[$wikiLang] ) ) {
1054                         $m = reset( $candidatesByLang[$wikiLang] );
1055                         $this->setVar( 'wgShellLocale', $m[0] );
1056                         return true;
1057                 }
1058
1059                 # Are there any at all?
1060                 if ( count( $candidatesByLocale ) ) {
1061                         $m = reset( $candidatesByLocale );
1062                         $this->setVar( 'wgShellLocale', $m[0] );
1063                         return true;
1064                 }
1065
1066                 # Give up.
1067                 return true;
1068         }
1069
1070         /**
1071          * Environment check for the permissions of the uploads directory
1072          * @return bool
1073          */
1074         protected function envCheckUploadsDirectory() {
1075                 global $IP;
1076
1077                 $dir = $IP . '/images/';
1078                 $url = $this->getVar( 'wgServer' ) . $this->getVar( 'wgScriptPath' ) . '/images/';
1079                 $safe = !$this->dirIsExecutable( $dir, $url );
1080
1081                 if ( !$safe ) {
1082                         $this->showMessage( 'config-uploads-not-safe', $dir );
1083                 }
1084                 return true;
1085         }
1086
1087         /**
1088          * Checks if suhosin.get.max_value_length is set, and if so generate
1089          * a warning because it decreases ResourceLoader performance.
1090          * @return bool
1091          */
1092         protected function envCheckSuhosinMaxValueLength() {
1093                 $maxValueLength = ini_get( 'suhosin.get.max_value_length' );
1094                 if ( $maxValueLength > 0 && $maxValueLength < 1024 ) {
1095                         // Only warn if the value is below the sane 1024
1096                         $this->showMessage( 'config-suhosin-max-value-length', $maxValueLength );
1097                 }
1098                 return true;
1099         }
1100
1101         /**
1102          * Convert a hex string representing a Unicode code point to that code point.
1103          * @param $c String
1104          * @return string
1105          */
1106         protected function unicodeChar( $c ) {
1107                 $c = hexdec( $c );
1108                 if ( $c <= 0x7F ) {
1109                         return chr( $c );
1110                 } elseif ( $c <= 0x7FF ) {
1111                         return chr( 0xC0 | $c >> 6 ) . chr( 0x80 | $c & 0x3F );
1112                 } elseif ( $c <= 0xFFFF ) {
1113                         return chr( 0xE0 | $c >> 12 ) . chr( 0x80 | $c >> 6 & 0x3F )
1114                                 . chr( 0x80 | $c & 0x3F );
1115                 } elseif ( $c <= 0x10FFFF ) {
1116                         return chr( 0xF0 | $c >> 18 ) . chr( 0x80 | $c >> 12 & 0x3F )
1117                                 . chr( 0x80 | $c >> 6 & 0x3F )
1118                                 . chr( 0x80 | $c & 0x3F );
1119                 } else {
1120                         return false;
1121                 }
1122         }
1123
1124         /**
1125          * Check the libicu version
1126          */
1127         protected function envCheckLibicu() {
1128                 $utf8 = function_exists( 'utf8_normalize' );
1129                 $intl = function_exists( 'normalizer_normalize' );
1130
1131                 /**
1132                  * This needs to be updated something that the latest libicu
1133                  * will properly normalize.  This normalization was found at
1134                  * http://www.unicode.org/versions/Unicode5.2.0/#Character_Additions
1135                  * Note that we use the hex representation to create the code
1136                  * points in order to avoid any Unicode-destroying during transit.
1137                  */
1138                 $not_normal_c = $this->unicodeChar( "FA6C" );
1139                 $normal_c = $this->unicodeChar( "242EE" );
1140
1141                 $useNormalizer = 'php';
1142                 $needsUpdate = false;
1143
1144                 /**
1145                  * We're going to prefer the pecl extension here unless
1146                  * utf8_normalize is more up to date.
1147                  */
1148                 if ( $utf8 ) {
1149                         $useNormalizer = 'utf8';
1150                         $utf8 = utf8_normalize( $not_normal_c, UtfNormal::UNORM_NFC );
1151                         if ( $utf8 !== $normal_c ) {
1152                                 $needsUpdate = true;
1153                         }
1154                 }
1155                 if ( $intl ) {
1156                         $useNormalizer = 'intl';
1157                         $intl = normalizer_normalize( $not_normal_c, Normalizer::FORM_C );
1158                         if ( $intl !== $normal_c ) {
1159                                 $needsUpdate = true;
1160                         }
1161                 }
1162
1163                 // Uses messages 'config-unicode-using-php', 'config-unicode-using-utf8', 'config-unicode-using-intl'
1164                 if ( $useNormalizer === 'php' ) {
1165                         $this->showMessage( 'config-unicode-pure-php-warning' );
1166                 } else {
1167                         $this->showMessage( 'config-unicode-using-' . $useNormalizer );
1168                         if ( $needsUpdate ) {
1169                                 $this->showMessage( 'config-unicode-update-warning' );
1170                         }
1171                 }
1172         }
1173
1174         /**
1175          * @return bool
1176          */
1177         protected function envCheckCtype() {
1178                 if ( !function_exists( 'ctype_digit' ) ) {
1179                         $this->showError( 'config-ctype' );
1180                         return false;
1181                 }
1182                 return true;
1183         }
1184
1185         /**
1186          * @return bool
1187          */
1188         protected function envCheckJSON() {
1189                 if ( !function_exists( 'json_decode' ) ) {
1190                         $this->showError( 'config-json' );
1191                         return false;
1192                 }
1193                 return true;
1194         }
1195
1196         /**
1197          * Get an array of likely places we can find executables. Check a bunch
1198          * of known Unix-like defaults, as well as the PATH environment variable
1199          * (which should maybe make it work for Windows?)
1200          *
1201          * @return Array
1202          */
1203         protected static function getPossibleBinPaths() {
1204                 return array_merge(
1205                         array( '/usr/bin', '/usr/local/bin', '/opt/csw/bin',
1206                                 '/usr/gnu/bin', '/usr/sfw/bin', '/sw/bin', '/opt/local/bin' ),
1207                         explode( PATH_SEPARATOR, getenv( 'PATH' ) )
1208                 );
1209         }
1210
1211         /**
1212          * Search a path for any of the given executable names. Returns the
1213          * executable name if found. Also checks the version string returned
1214          * by each executable.
1215          *
1216          * Used only by environment checks.
1217          *
1218          * @param string $path path to search
1219          * @param array $names of executable names
1220          * @param $versionInfo Boolean false or array with two members:
1221          *               0 => Command to run for version check, with $1 for the full executable name
1222          *               1 => String to compare the output with
1223          *
1224          * If $versionInfo is not false, only executables with a version
1225          * matching $versionInfo[1] will be returned.
1226          * @return bool|string
1227          */
1228         public static function locateExecutable( $path, $names, $versionInfo = false ) {
1229                 if ( !is_array( $names ) ) {
1230                         $names = array( $names );
1231                 }
1232
1233                 foreach ( $names as $name ) {
1234                         $command = $path . DIRECTORY_SEPARATOR . $name;
1235
1236                         wfSuppressWarnings();
1237                         $file_exists = file_exists( $command );
1238                         wfRestoreWarnings();
1239
1240                         if ( $file_exists ) {
1241                                 if ( !$versionInfo ) {
1242                                         return $command;
1243                                 }
1244
1245                                 $file = str_replace( '$1', wfEscapeShellArg( $command ), $versionInfo[0] );
1246                                 if ( strstr( wfShellExec( $file ), $versionInfo[1] ) !== false ) {
1247                                         return $command;
1248                                 }
1249                         }
1250                 }
1251                 return false;
1252         }
1253
1254         /**
1255          * Same as locateExecutable(), but checks in getPossibleBinPaths() by default
1256          * @see locateExecutable()
1257          * @param $names
1258          * @param $versionInfo bool
1259          * @return bool|string
1260          */
1261         public static function locateExecutableInDefaultPaths( $names, $versionInfo = false ) {
1262                 foreach ( self::getPossibleBinPaths() as $path ) {
1263                         $exe = self::locateExecutable( $path, $names, $versionInfo );
1264                         if ( $exe !== false ) {
1265                                 return $exe;
1266                         }
1267                 }
1268                 return false;
1269         }
1270
1271         /**
1272          * Checks if scripts located in the given directory can be executed via the given URL.
1273          *
1274          * Used only by environment checks.
1275          * @param $dir string
1276          * @param $url string
1277          * @return bool|int|string
1278          */
1279         public function dirIsExecutable( $dir, $url ) {
1280                 $scriptTypes = array(
1281                         'php' => array(
1282                                 "<?php echo 'ex' . 'ec';",
1283                                 "#!/var/env php5\n<?php echo 'ex' . 'ec';",
1284                         ),
1285                 );
1286
1287                 // it would be good to check other popular languages here, but it'll be slow.
1288
1289                 wfSuppressWarnings();
1290
1291                 foreach ( $scriptTypes as $ext => $contents ) {
1292                         foreach ( $contents as $source ) {
1293                                 $file = 'exectest.' . $ext;
1294
1295                                 if ( !file_put_contents( $dir . $file, $source ) ) {
1296                                         break;
1297                                 }
1298
1299                                 try {
1300                                         $text = Http::get( $url . $file, array( 'timeout' => 3 ) );
1301                                 }
1302                                 catch ( MWException $e ) {
1303                                         // Http::get throws with allow_url_fopen = false and no curl extension.
1304                                         $text = null;
1305                                 }
1306                                 unlink( $dir . $file );
1307
1308                                 if ( $text == 'exec' ) {
1309                                         wfRestoreWarnings();
1310                                         return $ext;
1311                                 }
1312                         }
1313                 }
1314
1315                 wfRestoreWarnings();
1316
1317                 return false;
1318         }
1319
1320         /**
1321          * Checks for presence of an Apache module. Works only if PHP is running as an Apache module, too.
1322          *
1323          * @param string $moduleName Name of module to check.
1324          * @return bool
1325          */
1326         public static function apacheModulePresent( $moduleName ) {
1327                 if ( function_exists( 'apache_get_modules' ) && in_array( $moduleName, apache_get_modules() ) ) {
1328                         return true;
1329                 }
1330                 // try it the hard way
1331                 ob_start();
1332                 phpinfo( INFO_MODULES );
1333                 $info = ob_get_clean();
1334                 return strpos( $info, $moduleName ) !== false;
1335         }
1336
1337         /**
1338          * ParserOptions are constructed before we determined the language, so fix it
1339          *
1340          * @param $lang Language
1341          */
1342         public function setParserLanguage( $lang ) {
1343                 $this->parserOptions->setTargetLanguage( $lang );
1344                 $this->parserOptions->setUserLang( $lang );
1345         }
1346
1347         /**
1348          * Overridden by WebInstaller to provide lastPage parameters.
1349          * @param $page string
1350          * @return string
1351          */
1352         protected function getDocUrl( $page ) {
1353                 return "{$_SERVER['PHP_SELF']}?page=" . urlencode( $page );
1354         }
1355
1356         /**
1357          * Finds extensions that follow the format /extensions/Name/Name.php,
1358          * and returns an array containing the value for 'Name' for each found extension.
1359          *
1360          * @return array
1361          */
1362         public function findExtensions() {
1363                 if ( $this->getVar( 'IP' ) === null ) {
1364                         return array();
1365                 }
1366
1367                 $extDir = $this->getVar( 'IP' ) . '/extensions';
1368                 if ( !is_readable( $extDir ) || !is_dir( $extDir ) ) {
1369                         return array();
1370                 }
1371
1372                 $dh = opendir( $extDir );
1373                 $exts = array();
1374                 while ( ( $file = readdir( $dh ) ) !== false ) {
1375                         if ( !is_dir( "$extDir/$file" ) ) {
1376                                 continue;
1377                         }
1378                         if ( file_exists( "$extDir/$file/$file.php" ) ) {
1379                                 $exts[] = $file;
1380                         }
1381                 }
1382                 closedir( $dh );
1383                 natcasesort( $exts );
1384
1385                 return $exts;
1386         }
1387
1388         /**
1389          * Installs the auto-detected extensions.
1390          *
1391          * @return Status
1392          */
1393         protected function includeExtensions() {
1394                 global $IP;
1395                 $exts = $this->getVar( '_Extensions' );
1396                 $IP = $this->getVar( 'IP' );
1397
1398                 /**
1399                  * We need to include DefaultSettings before including extensions to avoid
1400                  * warnings about unset variables. However, the only thing we really
1401                  * want here is $wgHooks['LoadExtensionSchemaUpdates']. This won't work
1402                  * if the extension has hidden hook registration in $wgExtensionFunctions,
1403                  * but we're not opening that can of worms
1404                  * @see https://bugzilla.wikimedia.org/show_bug.cgi?id=26857
1405                  */
1406                 global $wgAutoloadClasses;
1407                 $wgAutoloadClasses = array();
1408
1409                 require "$IP/includes/DefaultSettings.php";
1410
1411                 foreach ( $exts as $e ) {
1412                         require_once "$IP/extensions/$e/$e.php";
1413                 }
1414
1415                 $hooksWeWant = isset( $wgHooks['LoadExtensionSchemaUpdates'] ) ?
1416                         $wgHooks['LoadExtensionSchemaUpdates'] : array();
1417
1418                 // Unset everyone else's hooks. Lord knows what someone might be doing
1419                 // in ParserFirstCallInit (see bug 27171)
1420                 $GLOBALS['wgHooks'] = array( 'LoadExtensionSchemaUpdates' => $hooksWeWant );
1421
1422                 return Status::newGood();
1423         }
1424
1425         /**
1426          * Get an array of install steps. Should always be in the format of
1427          * array(
1428          *   'name'     => 'someuniquename',
1429          *   'callback' => array( $obj, 'method' ),
1430          * )
1431          * There must be a config-install-$name message defined per step, which will
1432          * be shown on install.
1433          *
1434          * @param $installer DatabaseInstaller so we can make callbacks
1435          * @return array
1436          */
1437         protected function getInstallSteps( DatabaseInstaller $installer ) {
1438                 $coreInstallSteps = array(
1439                         array( 'name' => 'database',   'callback' => array( $installer, 'setupDatabase' ) ),
1440                         array( 'name' => 'tables',     'callback' => array( $installer, 'createTables' ) ),
1441                         array( 'name' => 'interwiki',  'callback' => array( $installer, 'populateInterwikiTable' ) ),
1442                         array( 'name' => 'stats',      'callback' => array( $this, 'populateSiteStats' ) ),
1443                         array( 'name' => 'keys',       'callback' => array( $this, 'generateKeys' ) ),
1444                         array( 'name' => 'sysop',      'callback' => array( $this, 'createSysop' ) ),
1445                         array( 'name' => 'mainpage',   'callback' => array( $this, 'createMainpage' ) ),
1446                 );
1447
1448                 // Build the array of install steps starting from the core install list,
1449                 // then adding any callbacks that wanted to attach after a given step
1450                 foreach ( $coreInstallSteps as $step ) {
1451                         $this->installSteps[] = $step;
1452                         if ( isset( $this->extraInstallSteps[$step['name']] ) ) {
1453                                 $this->installSteps = array_merge(
1454                                         $this->installSteps,
1455                                         $this->extraInstallSteps[$step['name']]
1456                                 );
1457                         }
1458                 }
1459
1460                 // Prepend any steps that want to be at the beginning
1461                 if ( isset( $this->extraInstallSteps['BEGINNING'] ) ) {
1462                         $this->installSteps = array_merge(
1463                                 $this->extraInstallSteps['BEGINNING'],
1464                                 $this->installSteps
1465                         );
1466                 }
1467
1468                 // Extensions should always go first, chance to tie into hooks and such
1469                 if ( count( $this->getVar( '_Extensions' ) ) ) {
1470                         array_unshift( $this->installSteps,
1471                                 array( 'name' => 'extensions', 'callback' => array( $this, 'includeExtensions' ) )
1472                         );
1473                         $this->installSteps[] = array(
1474                                 'name' => 'extension-tables',
1475                                 'callback' => array( $installer, 'createExtensionTables' )
1476                         );
1477                 }
1478                 return $this->installSteps;
1479         }
1480
1481         /**
1482          * Actually perform the installation.
1483          *
1484          * @param array $startCB A callback array for the beginning of each step
1485          * @param array $endCB A callback array for the end of each step
1486          *
1487          * @return Array of Status objects
1488          */
1489         public function performInstallation( $startCB, $endCB ) {
1490                 $installResults = array();
1491                 $installer = $this->getDBInstaller();
1492                 $installer->preInstall();
1493                 $steps = $this->getInstallSteps( $installer );
1494                 foreach ( $steps as $stepObj ) {
1495                         $name = $stepObj['name'];
1496                         call_user_func_array( $startCB, array( $name ) );
1497
1498                         // Perform the callback step
1499                         $status = call_user_func( $stepObj['callback'], $installer );
1500
1501                         // Output and save the results
1502                         call_user_func( $endCB, $name, $status );
1503                         $installResults[$name] = $status;
1504
1505                         // If we've hit some sort of fatal, we need to bail.
1506                         // Callback already had a chance to do output above.
1507                         if ( !$status->isOk() ) {
1508                                 break;
1509                         }
1510                 }
1511                 if ( $status->isOk() ) {
1512                         $this->setVar( '_InstallDone', true );
1513                 }
1514                 return $installResults;
1515         }
1516
1517         /**
1518          * Generate $wgSecretKey. Will warn if we had to use an insecure random source.
1519          *
1520          * @return Status
1521          */
1522         public function generateKeys() {
1523                 $keys = array( 'wgSecretKey' => 64 );
1524                 if ( strval( $this->getVar( 'wgUpgradeKey' ) ) === '' ) {
1525                         $keys['wgUpgradeKey'] = 16;
1526                 }
1527                 return $this->doGenerateKeys( $keys );
1528         }
1529
1530         /**
1531          * Generate a secret value for variables using our CryptRand generator.
1532          * Produce a warning if the random source was insecure.
1533          *
1534          * @param $keys Array
1535          * @return Status
1536          */
1537         protected function doGenerateKeys( $keys ) {
1538                 $status = Status::newGood();
1539
1540                 $strong = true;
1541                 foreach ( $keys as $name => $length ) {
1542                         $secretKey = MWCryptRand::generateHex( $length, true );
1543                         if ( !MWCryptRand::wasStrong() ) {
1544                                 $strong = false;
1545                         }
1546
1547                         $this->setVar( $name, $secretKey );
1548                 }
1549
1550                 if ( !$strong ) {
1551                         $names = array_keys( $keys );
1552                         $names = preg_replace( '/^(.*)$/', '\$$1', $names );
1553                         global $wgLang;
1554                         $status->warning( 'config-insecure-keys', $wgLang->listToText( $names ), count( $names ) );
1555                 }
1556
1557                 return $status;
1558         }
1559
1560         /**
1561          * Create the first user account, grant it sysop and bureaucrat rights
1562          *
1563          * @return Status
1564          */
1565         protected function createSysop() {
1566                 $name = $this->getVar( '_AdminName' );
1567                 $user = User::newFromName( $name );
1568
1569                 if ( !$user ) {
1570                         // We should've validated this earlier anyway!
1571                         return Status::newFatal( 'config-admin-error-user', $name );
1572                 }
1573
1574                 if ( $user->idForName() == 0 ) {
1575                         $user->addToDatabase();
1576
1577                         try {
1578                                 $user->setPassword( $this->getVar( '_AdminPassword' ) );
1579                         } catch ( PasswordError $pwe ) {
1580                                 return Status::newFatal( 'config-admin-error-password', $name, $pwe->getMessage() );
1581                         }
1582
1583                         $user->addGroup( 'sysop' );
1584                         $user->addGroup( 'bureaucrat' );
1585                         if ( $this->getVar( '_AdminEmail' ) ) {
1586                                 $user->setEmail( $this->getVar( '_AdminEmail' ) );
1587                         }
1588                         $user->saveSettings();
1589
1590                         // Update user count
1591                         $ssUpdate = new SiteStatsUpdate( 0, 0, 0, 0, 1 );
1592                         $ssUpdate->doUpdate();
1593                 }
1594                 $status = Status::newGood();
1595
1596                 if ( $this->getVar( '_Subscribe' ) && $this->getVar( '_AdminEmail' ) ) {
1597                         $this->subscribeToMediaWikiAnnounce( $status );
1598                 }
1599
1600                 return $status;
1601         }
1602
1603         /**
1604          * @param $s Status
1605          */
1606         private function subscribeToMediaWikiAnnounce( Status $s ) {
1607                 $params = array(
1608                         'email' => $this->getVar( '_AdminEmail' ),
1609                         'language' => 'en',
1610                         'digest' => 0
1611                 );
1612
1613                 // Mailman doesn't support as many languages as we do, so check to make
1614                 // sure their selected language is available
1615                 $myLang = $this->getVar( '_UserLang' );
1616                 if ( in_array( $myLang, $this->mediaWikiAnnounceLanguages ) ) {
1617                         $myLang = $myLang == 'pt-br' ? 'pt_BR' : $myLang; // rewrite to Mailman's pt_BR
1618                         $params['language'] = $myLang;
1619                 }
1620
1621                 if ( MWHttpRequest::canMakeRequests() ) {
1622                         $res = MWHttpRequest::factory( $this->mediaWikiAnnounceUrl,
1623                                 array( 'method' => 'POST', 'postData' => $params ) )->execute();
1624                         if ( !$res->isOK() ) {
1625                                 $s->warning( 'config-install-subscribe-fail', $res->getMessage() );
1626                         }
1627                 } else {
1628                         $s->warning( 'config-install-subscribe-notpossible' );
1629                 }
1630         }
1631
1632         /**
1633          * Insert Main Page with default content.
1634          *
1635          * @param $installer DatabaseInstaller
1636          * @return Status
1637          */
1638         protected function createMainpage( DatabaseInstaller $installer ) {
1639                 $status = Status::newGood();
1640                 try {
1641                         $page = WikiPage::factory( Title::newMainPage() );
1642                         $content = new WikitextContent(
1643                                 wfMessage( 'mainpagetext' )->inContentLanguage()->text() . "\n\n" .
1644                                 wfMessage( 'mainpagedocfooter' )->inContentLanguage()->text()
1645                         );
1646
1647                         $page->doEditContent( $content,
1648                                         '',
1649                                         EDIT_NEW,
1650                                         false,
1651                                         User::newFromName( 'MediaWiki default' ) );
1652                 } catch ( MWException $e ) {
1653                         //using raw, because $wgShowExceptionDetails can not be set yet
1654                         $status->fatal( 'config-install-mainpage-failed', $e->getMessage() );
1655                 }
1656
1657                 return $status;
1658         }
1659
1660         /**
1661          * Override the necessary bits of the config to run an installation.
1662          */
1663         public static function overrideConfig() {
1664                 define( 'MW_NO_SESSION', 1 );
1665
1666                 // Don't access the database
1667                 $GLOBALS['wgUseDatabaseMessages'] = false;
1668                 // Don't cache langconv tables
1669                 $GLOBALS['wgLanguageConverterCacheType'] = CACHE_NONE;
1670                 // Debug-friendly
1671                 $GLOBALS['wgShowExceptionDetails'] = true;
1672                 // Don't break forms
1673                 $GLOBALS['wgExternalLinkTarget'] = '_blank';
1674
1675                 // Extended debugging
1676                 $GLOBALS['wgShowSQLErrors'] = true;
1677                 $GLOBALS['wgShowDBErrorBacktrace'] = true;
1678
1679                 // Allow multiple ob_flush() calls
1680                 $GLOBALS['wgDisableOutputCompression'] = true;
1681
1682                 // Use a sensible cookie prefix (not my_wiki)
1683                 $GLOBALS['wgCookiePrefix'] = 'mw_installer';
1684
1685                 // Some of the environment checks make shell requests, remove limits
1686                 $GLOBALS['wgMaxShellMemory'] = 0;
1687         }
1688
1689         /**
1690          * Add an installation step following the given step.
1691          *
1692          * @param array $callback A valid installation callback array, in this form:
1693          *    array( 'name' => 'some-unique-name', 'callback' => array( $obj, 'function' ) );
1694          * @param string $findStep the step to find. Omit to put the step at the beginning
1695          */
1696         public function addInstallStep( $callback, $findStep = 'BEGINNING' ) {
1697                 $this->extraInstallSteps[$findStep][] = $callback;
1698         }
1699
1700         /**
1701          * Disable the time limit for execution.
1702          * Some long-running pages (Install, Upgrade) will want to do this
1703          */
1704         protected function disableTimeLimit() {
1705                 wfSuppressWarnings();
1706                 set_time_limit( 0 );
1707                 wfRestoreWarnings();
1708         }
1709 }