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          * List of detected DBs, access using getCompiledDBs().
  51          *
  52          * @var array
  53          */
  54         protected $compiledDBs;
  55
  56         /**
  57          * Cached DB installer instances, access using getDBInstaller().
  58          *
  59          * @var array
  60          */
  61         protected $dbInstallers = array();
  62
  63         /**
  64          * Minimum memory size in MB.
  65          *
  66          * @var integer
  67          */
  68         protected $minMemorySize = 50;
  69
  70         /**
  71          * Cached Title, used by parse().
  72          *
  73          * @var Title
  74          */
  75         protected $parserTitle;
  76
  77         /**
  78          * Cached ParserOptions, used by parse().
  79          *
  80          * @var ParserOptions
  81          */
  82         protected $parserOptions;
  83
  84         /**
  85          * Known database types. These correspond to the class names <type>Installer,
  86          * and are also MediaWiki database types valid for $wgDBtype.
  87          *
  88          * To add a new type, create a <type>Installer class and a Database<type>
  89          * class, and add a config-type-<type> message to MessagesEn.php.
  90          *
  91          * @var array
  92          */
  93         protected static $dbTypes = array(
  94                 'mysql',
  95                 'postgres',
  96                 'oracle',
  97                 'sqlite',
  98         );
  99
 100         /**
 101          * A list of environment check methods called by doEnvironmentChecks().
 102          * These may output warnings using showMessage(), and/or abort the
 103          * installation process by returning false.
 104          *
 105          * @var array
 106          */
 107         protected $envChecks = array(
 108                 'envCheckDB',
 109                 'envCheckRegisterGlobals',
 110                 'envCheckBrokenXML',
 111                 'envCheckPHP531',
 112                 'envCheckMagicQuotes',
 113                 'envCheckMagicSybase',
 114                 'envCheckMbstring',
 115                 'envCheckZE1',
 116                 'envCheckSafeMode',
 117                 'envCheckXML',
 118                 'envCheckPCRE',
 119                 'envCheckMemory',
 120                 'envCheckCache',
 121                 'envCheckModSecurity',
 122                 'envCheckDiff3',
 123                 'envCheckGraphics',
 124                 'envCheckGit',
 125                 'envCheckServer',
 126                 'envCheckPath',
 127                 'envCheckExtension',
 128                 'envCheckShellLocale',
 129                 'envCheckUploadsDirectory',
 130                 'envCheckLibicu',
 131                 'envCheckSuhosinMaxValueLength',
 132                 'envCheckCtype',
 133                 'envCheckJSON',
 134         );
 135
 136         /**
 137          * MediaWiki configuration globals that will eventually be passed through
 138          * to LocalSettings.php. The names only are given here, the defaults
 139          * typically come from DefaultSettings.php.
 140          *
 141          * @var array
 142          */
 143         protected $defaultVarNames = array(
 144                 'wgSitename',
 145                 'wgPasswordSender',
 146                 'wgLanguageCode',
 147                 'wgRightsIcon',
 148                 'wgRightsText',
 149                 'wgRightsUrl',
 150                 'wgMainCacheType',
 151                 'wgEnableEmail',
 152                 'wgEnableUserEmail',
 153                 'wgEnotifUserTalk',
 154                 'wgEnotifWatchlist',
 155                 'wgEmailAuthentication',
 156                 'wgDBtype',
 157                 'wgDiff3',
 158                 'wgImageMagickConvertCommand',
 159                 'wgGitBin',
 160                 'IP',
 161                 'wgScriptPath',
 162                 'wgScriptExtension',
 163                 'wgMetaNamespace',
 164                 'wgDeletedDirectory',
 165                 'wgEnableUploads',
 166                 'wgLogo',
 167                 'wgShellLocale',
 168                 'wgSecretKey',
 169                 'wgUseInstantCommons',
 170                 'wgUpgradeKey',
 171                 'wgDefaultSkin',
 172                 'wgResourceLoaderMaxQueryLength',
 173         );
 174
 175         /**
 176          * Variables that are stored alongside globals, and are used for any
 177          * configuration of the installation process aside from the MediaWiki
 178          * configuration. Map of names to defaults.
 179          *
 180          * @var array
 181          */
 182         protected $internalDefaults = array(
 183                 '_UserLang' => 'en',
 184                 '_Environment' => false,
 185                 '_SafeMode' => false,
 186                 '_RaiseMemory' => false,
 187                 '_UpgradeDone' => false,
 188                 '_InstallDone' => false,
 189                 '_Caches' => array(),
 190                 '_InstallPassword' => '',
 191                 '_SameAccount' => true,
 192                 '_CreateDBAccount' => false,
 193                 '_NamespaceType' => 'site-name',
 194                 '_AdminName' => '', // will be set later, when the user selects language
 195                 '_AdminPassword' => '',
 196                 '_AdminPassword2' => '',
 197                 '_AdminEmail' => '',
 198                 '_Subscribe' => false,
 199                 '_SkipOptional' => 'continue',
 200                 '_RightsProfile' => 'wiki',
 201                 '_LicenseCode' => 'none',
 202                 '_CCDone' => false,
 203                 '_Extensions' => array(),
 204                 '_MemCachedServers' => '',
 205                 '_UpgradeKeySupplied' => false,
 206                 '_ExistingDBSettings' => false,
 207         );
 208
 209         /**
 210          * The actual list of installation steps. This will be initialized by getInstallSteps()
 211          *
 212          * @var array
 213          */
 214         private $installSteps = array();
 215
 216         /**
 217          * Extra steps for installation, for things like DatabaseInstallers to modify
 218          *
 219          * @var array
 220          */
 221         protected $extraInstallSteps = array();
 222
 223         /**
 224          * Known object cache types and the functions used to test for their existence.
 225          *
 226          * @var array
 227          */
 228         protected $objectCaches = array(
 229                 'xcache' => 'xcache_get',
 230                 'apc' => 'apc_fetch',
 231                 'wincache' => 'wincache_ucache_get'
 232         );
 233
 234         /**
 235          * User rights profiles.
 236          *
 237          * @var array
 238          */
 239         public $rightsProfiles = array(
 240                 'wiki' => array(),
 241                 'no-anon' => array(
 242                         '*' => array( 'edit' => false )
 243                 ),
 244                 'fishbowl' => array(
 245                         '*' => array(
 246                                 'createaccount' => false,
 247                                 'edit' => false,
 248                         ),
 249                 ),
 250                 'private' => array(
 251                         '*' => array(
 252                                 'createaccount' => false,
 253                                 'edit' => false,
 254                                 'read' => false,
 255                         ),
 256                 ),
 257         );
 258
 259         /**
 260          * License types.
 261          *
 262          * @var array
 263          */
 264         public $licenses = array(
 265                 'cc-by' => array(
 266                         'url' => 'http://creativecommons.org/licenses/by/3.0/',
 267                         'icon' => '{$wgStylePath}/common/images/cc-by.png',
 268                 ),
 269                 'cc-by-sa' => array(
 270                         'url' => 'http://creativecommons.org/licenses/by-sa/3.0/',
 271                         'icon' => '{$wgStylePath}/common/images/cc-by-sa.png',
 272                 ),
 273                 'cc-by-nc-sa' => array(
 274                         'url' => 'http://creativecommons.org/licenses/by-nc-sa/3.0/',
 275                         'icon' => '{$wgStylePath}/common/images/cc-by-nc-sa.png',
 276                 ),
 277                 'cc-0' => array(
 278                         'url' => 'https://creativecommons.org/publicdomain/zero/1.0/',
 279                         'icon' => '{$wgStylePath}/common/images/cc-0.png',
 280                 ),
 281                 'pd' => array(
 282                         'url' => '',
 283                         'icon' => '{$wgStylePath}/common/images/public-domain.png',
 284                 ),
 285                 'gfdl' => array(
 286                         'url' => 'http://www.gnu.org/copyleft/fdl.html',
 287                         'icon' => '{$wgStylePath}/common/images/gnu-fdl.png',
 288                 ),
 289                 'none' => array(
 290                         'url' => '',
 291                         'icon' => '',
 292                         'text' => ''
 293                 ),
 294                 'cc-choose' => array(
 295                         // Details will be filled in by the selector.
 296                         'url' => '',
 297                         'icon' => '',
 298                         'text' => '',
 299                 ),
 300         );
 301
 302         /**
 303          * URL to mediawiki-announce subscription
 304          */
 305         protected $mediaWikiAnnounceUrl =
 306                 'https://lists.wikimedia.org/mailman/subscribe/mediawiki-announce';
 307
 308         /**
 309          * Supported language codes for Mailman
 310          */
 311         protected $mediaWikiAnnounceLanguages = array(
 312                 'ca', 'cs', 'da', 'de', 'en', 'es', 'et', 'eu', 'fi', 'fr', 'hr', 'hu',
 313                 'it', 'ja', 'ko', 'lt', 'nl', 'no', 'pl', 'pt', 'pt-br', 'ro', 'ru',
 314                 'sl', 'sr', 'sv', 'tr', 'uk'
 315         );
 316
 317         /**
 318          * UI interface for displaying a short message
 319          * The parameters are like parameters to wfMessage().
 320          * The messages will be in wikitext format, which will be converted to an
 321          * output format such as HTML or text before being sent to the user.
 322          * @param $msg
 323          */
 324         abstract public function showMessage( $msg /*, ... */ );
 325
 326         /**
 327          * Same as showMessage(), but for displaying errors
 328          * @param $msg
 329          */
 330         abstract public function showError( $msg /*, ... */ );
 331
 332         /**
 333          * Show a message to the installing user by using a Status object
 334          * @param $status Status
 335          */
 336         abstract public function showStatusMessage( Status $status );
 337
 338         /**
 339          * Constructor, always call this from child classes.
 340          */
 341         public function __construct() {
 342                 global $wgExtensionMessagesFiles, $wgUser;
 343
 344                 // Disable the i18n cache and LoadBalancer
 345                 Language::getLocalisationCache()->disableBackend();
 346                 LBFactory::disableBackend();
 347
 348                 // Load the installer's i18n file.
 349                 $wgExtensionMessagesFiles['MediawikiInstaller'] =
 350                         __DIR__ . '/Installer.i18n.php';
 351
 352                 // Having a user with id = 0 safeguards us from DB access via User::loadOptions().
 353                 $wgUser = User::newFromId( 0 );
 354
 355                 $this->settings = $this->internalDefaults;
 356
 357                 foreach ( $this->defaultVarNames as $var ) {
 358                         $this->settings[$var] = $GLOBALS[$var];
 359                 }
 360
 361                 $compiledDBs = array();
 362                 foreach ( self::getDBTypes() as $type ) {
 363                         $installer = $this->getDBInstaller( $type );
 364
 365                         if ( !$installer->isCompiled() ) {
 366                                 continue;
 367                         }
 368                         $compiledDBs[] = $type;
 369
 370                         $defaults = $installer->getGlobalDefaults();
 371
 372                         foreach ( $installer->getGlobalNames() as $var ) {
 373                                 if ( isset( $defaults[$var] ) ) {
 374                                         $this->settings[$var] = $defaults[$var];
 375                                 } else {
 376                                         $this->settings[$var] = $GLOBALS[$var];
 377                                 }
 378                         }
 379                 }
 380                 $this->compiledDBs = $compiledDBs;
 381
 382                 $this->parserTitle = Title::newFromText( 'Installer' );
 383                 $this->parserOptions = new ParserOptions; // language will  be wrong :(
 384                 $this->parserOptions->setEditSection( false );
 385         }
 386
 387         /**
 388          * Get a list of known DB types.
 389          *
 390          * @return array
 391          */
 392         public static function getDBTypes() {
 393                 return self::$dbTypes;
 394         }
 395
 396         /**
 397          * Do initial checks of the PHP environment. Set variables according to
 398          * the observed environment.
 399          *
 400          * It's possible that this may be called under the CLI SAPI, not the SAPI
 401          * that the wiki will primarily run under. In that case, the subclass should
 402          * initialise variables such as wgScriptPath, before calling this function.
 403          *
 404          * Under the web subclass, it can already be assumed that PHP 5+ is in use
 405          * and that sessions are working.
 406          *
 407          * @return Status
 408          */
 409         public function doEnvironmentChecks() {
 410                 $phpVersion = phpversion();
 411                 if ( version_compare( $phpVersion, self::MINIMUM_PHP_VERSION, '>=' ) ) {
 412                         $this->showMessage( 'config-env-php', $phpVersion );
 413                         $good = true;
 414                 } else {
 415                         $this->showMessage( 'config-env-php-toolow', $phpVersion, self::MINIMUM_PHP_VERSION );
 416                         $good = false;
 417                 }
 418
 419                 if ( $good ) {
 420                         foreach ( $this->envChecks as $check ) {
 421                                 $status = $this->$check();
 422                                 if ( $status === false ) {
 423                                         $good = false;
 424                                 }
 425                         }
 426                 }
 427
 428                 $this->setVar( '_Environment', $good );
 429
 430                 return $good ? Status::newGood() : Status::newFatal( 'config-env-bad' );
 431         }
 432
 433         /**
 434          * Set a MW configuration variable, or internal installer configuration variable.
 435          *
 436          * @param $name String
 437          * @param $value Mixed
 438          */
 439         public function setVar( $name, $value ) {
 440                 $this->settings[$name] = $value;
 441         }
 442
 443         /**
 444          * Get an MW configuration variable, or internal installer configuration variable.
 445          * The defaults come from $GLOBALS (ultimately DefaultSettings.php).
 446          * Installer variables are typically prefixed by an underscore.
 447          *
 448          * @param $name String
 449          * @param $default Mixed
 450          *
 451          * @return mixed
 452          */
 453         public function getVar( $name, $default = null ) {
 454                 if ( !isset( $this->settings[$name] ) ) {
 455                         return $default;
 456                 } else {
 457                         return $this->settings[$name];
 458                 }
 459         }
 460
 461         /**
 462          * Get a list of DBs supported by current PHP setup
 463          *
 464          * @return array
 465          */
 466         public function getCompiledDBs() {
 467                 return $this->compiledDBs;
 468         }
 469
 470         /**
 471          * Get an instance of DatabaseInstaller for the specified DB type.
 472          *
 473          * @param $type Mixed: DB installer for which is needed, false to use default.
 474          *
 475          * @return DatabaseInstaller
 476          */
 477         public function getDBInstaller( $type = false ) {
 478                 if ( !$type ) {
 479                         $type = $this->getVar( 'wgDBtype' );
 480                 }
 481
 482                 $type = strtolower( $type );
 483
 484                 if ( !isset( $this->dbInstallers[$type] ) ) {
 485                         $class = ucfirst( $type ) . 'Installer';
 486                         $this->dbInstallers[$type] = new $class( $this );
 487                 }
 488
 489                 return $this->dbInstallers[$type];
 490         }
 491
 492         /**
 493          * Determine if LocalSettings.php exists. If it does, return its variables,
 494          * merged with those from AdminSettings.php, as an array.
 495          *
 496          * @return Array
 497          */
 498         public static function getExistingLocalSettings() {
 499                 global $IP;
 500
 501                 wfSuppressWarnings();
 502                 $_lsExists = file_exists( "$IP/LocalSettings.php" );
 503                 wfRestoreWarnings();
 504
 505                 if ( !$_lsExists ) {
 506                         return false;
 507                 }
 508                 unset( $_lsExists );
 509
 510                 require "$IP/includes/DefaultSettings.php";
 511                 require "$IP/LocalSettings.php";
 512                 if ( file_exists( "$IP/AdminSettings.php" ) ) {
 513                         require "$IP/AdminSettings.php";
 514                 }
 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
 643                 return Status::newGood();
 644         }
 645
 646         /**
 647          * Exports all wg* variables stored by the installer into global scope.
 648          */
 649         public function exportVars() {
 650                 foreach ( $this->settings as $name => $value ) {
 651                         if ( substr( $name, 0, 2 ) == 'wg' ) {
 652                                 $GLOBALS[$name] = $value;
 653                         }
 654                 }
 655         }
 656
 657         /**
 658          * Environment check for DB types.
 659          * @return bool
 660          */
 661         protected function envCheckDB() {
 662                 global $wgLang;
 663
 664                 $allNames = array();
 665
 666                 // Messages: config-type-mysql, config-type-postgres, config-type-oracle,
 667                 // config-type-sqlite
 668                 foreach ( self::getDBTypes() as $name ) {
 669                         $allNames[] = wfMessage( "config-type-$name" )->text();
 670                 }
 671
 672                 $databases = $this->getCompiledDBs();
 673
 674                 $databases = array_flip( $databases );
 675                 foreach ( array_keys( $databases ) as $db ) {
 676                         $installer = $this->getDBInstaller( $db );
 677                         $status = $installer->checkPrerequisites();
 678                         if ( !$status->isGood() ) {
 679                                 $this->showStatusMessage( $status );
 680                         }
 681                         if ( !$status->isOK() ) {
 682                                 unset( $databases[$db] );
 683                         }
 684                 }
 685                 $databases = array_flip( $databases );
 686                 if ( !$databases ) {
 687                         $this->showError( 'config-no-db', $wgLang->commaList( $allNames ) );
 688
 689                         // @todo FIXME: This only works for the web installer!
 690                         return false;
 691                 }
 692
 693                 return true;
 694         }
 695
 696         /**
 697          * Environment check for register_globals.
 698          */
 699         protected function envCheckRegisterGlobals() {
 700                 if ( wfIniGetBool( 'register_globals' ) ) {
 701                         $this->showMessage( 'config-register-globals' );
 702                 }
 703         }
 704
 705         /**
 706          * Some versions of libxml+PHP break < and > encoding horribly
 707          * @return bool
 708          */
 709         protected function envCheckBrokenXML() {
 710                 $test = new PhpXmlBugTester();
 711                 if ( !$test->ok ) {
 712                         $this->showError( 'config-brokenlibxml' );
 713
 714                         return false;
 715                 }
 716
 717                 return true;
 718         }
 719
 720         /**
 721          * Test PHP (probably 5.3.1, but it could regress again) to make sure that
 722          * reference parameters to __call() are not converted to null
 723          * @return bool
 724          */
 725         protected function envCheckPHP531() {
 726                 $test = new PhpRefCallBugTester;
 727                 $test->execute();
 728                 if ( !$test->ok ) {
 729                         $this->showError( 'config-using531', phpversion() );
 730
 731                         return false;
 732                 }
 733
 734                 return true;
 735         }
 736
 737         /**
 738          * Environment check for magic_quotes_runtime.
 739          * @return bool
 740          */
 741         protected function envCheckMagicQuotes() {
 742                 if ( wfIniGetBool( "magic_quotes_runtime" ) ) {
 743                         $this->showError( 'config-magic-quotes-runtime' );
 744
 745                         return false;
 746                 }
 747
 748                 return true;
 749         }
 750
 751         /**
 752          * Environment check for magic_quotes_sybase.
 753          * @return bool
 754          */
 755         protected function envCheckMagicSybase() {
 756                 if ( wfIniGetBool( 'magic_quotes_sybase' ) ) {
 757                         $this->showError( 'config-magic-quotes-sybase' );
 758
 759                         return false;
 760                 }
 761
 762                 return true;
 763         }
 764
 765         /**
 766          * Environment check for mbstring.func_overload.
 767          * @return bool
 768          */
 769         protected function envCheckMbstring() {
 770                 if ( wfIniGetBool( 'mbstring.func_overload' ) ) {
 771                         $this->showError( 'config-mbstring' );
 772
 773                         return false;
 774                 }
 775
 776                 return true;
 777         }
 778
 779         /**
 780          * Environment check for zend.ze1_compatibility_mode.
 781          * @return bool
 782          */
 783         protected function envCheckZE1() {
 784                 if ( wfIniGetBool( 'zend.ze1_compatibility_mode' ) ) {
 785                         $this->showError( 'config-ze1' );
 786
 787                         return false;
 788                 }
 789
 790                 return true;
 791         }
 792
 793         /**
 794          * Environment check for safe_mode.
 795          * @return bool
 796          */
 797         protected function envCheckSafeMode() {
 798                 if ( wfIniGetBool( 'safe_mode' ) ) {
 799                         $this->setVar( '_SafeMode', true );
 800                         $this->showMessage( 'config-safe-mode' );
 801                 }
 802
 803                 return true;
 804         }
 805
 806         /**
 807          * Environment check for the XML module.
 808          * @return bool
 809          */
 810         protected function envCheckXML() {
 811                 if ( !function_exists( "utf8_encode" ) ) {
 812                         $this->showError( 'config-xml-bad' );
 813
 814                         return false;
 815                 }
 816
 817                 return true;
 818         }
 819
 820         /**
 821          * Environment check for the PCRE module.
 822          *
 823          * @note If this check were to fail, the parser would
 824          *   probably throw an exception before the result
 825          *   of this check is shown to the user.
 826          * @return bool
 827          */
 828         protected function envCheckPCRE() {
 829                 if ( !function_exists( 'preg_match' ) ) {
 830                         $this->showError( 'config-pcre' );
 831
 832                         return false;
 833                 }
 834                 wfSuppressWarnings();
 835                 $regexd = preg_replace( '/[\x{0430}-\x{04FF}]/iu', '', '-АБВГД-' );
 836                 // Need to check for \p support too, as PCRE can be compiled
 837                 // with utf8 support, but not unicode property support.
 838                 // check that \p{Zs} (space separators) matches
 839                 // U+3000 (Ideographic space)
 840                 $regexprop = preg_replace( '/\p{Zs}/u', '', "-\xE3\x80\x80-" );
 841                 wfRestoreWarnings();
 842                 if ( $regexd != '--' || $regexprop != '--' ) {
 843                         $this->showError( 'config-pcre-no-utf8' );
 844
 845                         return false;
 846                 }
 847
 848                 return true;
 849         }
 850
 851         /**
 852          * Environment check for available memory.
 853          * @return bool
 854          */
 855         protected function envCheckMemory() {
 856                 $limit = ini_get( 'memory_limit' );
 857
 858                 if ( !$limit || $limit == -1 ) {
 859                         return true;
 860                 }
 861
 862                 $n = wfShorthandToInteger( $limit );
 863
 864                 if ( $n < $this->minMemorySize * 1024 * 1024 ) {
 865                         $newLimit = "{$this->minMemorySize}M";
 866
 867                         if ( ini_set( "memory_limit", $newLimit ) === false ) {
 868                                 $this->showMessage( 'config-memory-bad', $limit );
 869                         } else {
 870                                 $this->showMessage( 'config-memory-raised', $limit, $newLimit );
 871                                 $this->setVar( '_RaiseMemory', true );
 872                         }
 873                 }
 874
 875                 return true;
 876         }
 877
 878         /**
 879          * Environment check for compiled object cache types.
 880          */
 881         protected function envCheckCache() {
 882                 $caches = array();
 883                 foreach ( $this->objectCaches as $name => $function ) {
 884                         if ( function_exists( $function ) ) {
 885                                 if ( $name == 'xcache' && !wfIniGetBool( 'xcache.var_size' ) ) {
 886                                         continue;
 887                                 }
 888                                 $caches[$name] = true;
 889                         }
 890                 }
 891
 892                 if ( !$caches ) {
 893                         $this->showMessage( 'config-no-cache' );
 894                 }
 895
 896                 $this->setVar( '_Caches', $caches );
 897         }
 898
 899         /**
 900          * Scare user to death if they have mod_security
 901          * @return bool
 902          */
 903         protected function envCheckModSecurity() {
 904                 if ( self::apacheModulePresent( 'mod_security' ) ) {
 905                         $this->showMessage( 'config-mod-security' );
 906                 }
 907
 908                 return true;
 909         }
 910
 911         /**
 912          * Search for GNU diff3.
 913          * @return bool
 914          */
 915         protected function envCheckDiff3() {
 916                 $names = array( "gdiff3", "diff3", "diff3.exe" );
 917                 $versionInfo = array( '$1 --version 2>&1', 'GNU diffutils' );
 918
 919                 $diff3 = self::locateExecutableInDefaultPaths( $names, $versionInfo );
 920
 921                 if ( $diff3 ) {
 922                         $this->setVar( 'wgDiff3', $diff3 );
 923                 } else {
 924                         $this->setVar( 'wgDiff3', false );
 925                         $this->showMessage( 'config-diff3-bad' );
 926                 }
 927
 928                 return true;
 929         }
 930
 931         /**
 932          * Environment check for ImageMagick and GD.
 933          * @return bool
 934          */
 935         protected function envCheckGraphics() {
 936                 $names = array( wfIsWindows() ? 'convert.exe' : 'convert' );
 937                 $versionInfo = array( '$1 -version', 'ImageMagick' );
 938                 $convert = self::locateExecutableInDefaultPaths( $names, $versionInfo );
 939
 940                 $this->setVar( 'wgImageMagickConvertCommand', '' );
 941                 if ( $convert ) {
 942                         $this->setVar( 'wgImageMagickConvertCommand', $convert );
 943                         $this->showMessage( 'config-imagemagick', $convert );
 944
 945                         return true;
 946                 } elseif ( function_exists( 'imagejpeg' ) ) {
 947                         $this->showMessage( 'config-gd' );
 948                 } else {
 949                         $this->showMessage( 'config-no-scaling' );
 950                 }
 951
 952                 return true;
 953         }
 954
 955         /**
 956          * Search for git.
 957          *
 958          * @since 1.22
 959          * @return bool
 960          */
 961         protected function envCheckGit() {
 962                 $names = array( wfIsWindows() ? 'git.exe' : 'git' );
 963                 $versionInfo = array( '$1 --version', 'git version' );
 964
 965                 $git = self::locateExecutableInDefaultPaths( $names, $versionInfo );
 966
 967                 if ( $git ) {
 968                         $this->setVar( 'wgGitBin', $git );
 969                         $this->showMessage( 'config-git', $git );
 970                 } else {
 971                         $this->setVar( 'wgGitBin', false );
 972                         $this->showMessage( 'config-git-bad' );
 973                 }
 974
 975                 return true;
 976         }
 977
 978         /**
 979          * Environment check for the server hostname.
 980          */
 981         protected function envCheckServer() {
 982                 $server = $this->envGetDefaultServer();
 983                 if ( $server !== null ) {
 984                         $this->showMessage( 'config-using-server', $server );
 985                         $this->setVar( 'wgServer', $server );
 986                 }
 987
 988                 return true;
 989         }
 990
 991         /**
 992          * Helper function to be called from envCheckServer()
 993          * @return String
 994          */
 995         abstract protected function envGetDefaultServer();
 996
 997         /**
 998          * Environment check for setting $IP and $wgScriptPath.
 999          * @return bool
1000          */
1001         protected function envCheckPath() {
1002                 global $IP;
1003                 $IP = dirname( dirname( __DIR__ ) );
1004                 $this->setVar( 'IP', $IP );
1005
1006                 $this->showMessage(
1007                         'config-using-uri',
1008                         $this->getVar( 'wgServer' ),
1009                         $this->getVar( 'wgScriptPath' )
1010                 );
1011
1012                 return true;
1013         }
1014
1015         /**
1016          * Environment check for setting the preferred PHP file extension.
1017          * @return bool
1018          */
1019         protected function envCheckExtension() {
1020                 // @todo FIXME: Detect this properly
1021                 if ( defined( 'MW_INSTALL_PHP5_EXT' ) ) {
1022                         $ext = 'php5';
1023                 } else {
1024                         $ext = 'php';
1025                 }
1026                 $this->setVar( 'wgScriptExtension', ".$ext" );
1027
1028                 return true;
1029         }
1030
1031         /**
1032          * Environment check for preferred locale in shell
1033          * @return bool
1034          */
1035         protected function envCheckShellLocale() {
1036                 $os = php_uname( 's' );
1037                 $supported = array( 'Linux', 'SunOS', 'HP-UX', 'Darwin' ); # Tested these
1038
1039                 if ( !in_array( $os, $supported ) ) {
1040                         return true;
1041                 }
1042
1043                 # Get a list of available locales.
1044                 $ret = false;
1045                 $lines = wfShellExec( '/usr/bin/locale -a', $ret );
1046
1047                 if ( $ret ) {
1048                         return true;
1049                 }
1050
1051                 $lines = array_map( 'trim', explode( "\n", $lines ) );
1052                 $candidatesByLocale = array();
1053                 $candidatesByLang = array();
1054
1055                 foreach ( $lines as $line ) {
1056                         if ( $line === '' ) {
1057                                 continue;
1058                         }
1059
1060                         if ( !preg_match( '/^([a-zA-Z]+)(_[a-zA-Z]+|)\.(utf8|UTF-8)(@[a-zA-Z_]*|)$/i', $line, $m ) ) {
1061                                 continue;
1062                         }
1063
1064                         list( , $lang, , , ) = $m;
1065
1066                         $candidatesByLocale[$m[0]] = $m;
1067                         $candidatesByLang[$lang][] = $m;
1068                 }
1069
1070                 # Try the current value of LANG.
1071                 if ( isset( $candidatesByLocale[getenv( 'LANG' )] ) ) {
1072                         $this->setVar( 'wgShellLocale', getenv( 'LANG' ) );
1073
1074                         return true;
1075                 }
1076
1077                 # Try the most common ones.
1078                 $commonLocales = array( 'en_US.UTF-8', 'en_US.utf8', 'de_DE.UTF-8', 'de_DE.utf8' );
1079                 foreach ( $commonLocales as $commonLocale ) {
1080                         if ( isset( $candidatesByLocale[$commonLocale] ) ) {
1081                                 $this->setVar( 'wgShellLocale', $commonLocale );
1082
1083                                 return true;
1084                         }
1085                 }
1086
1087                 # Is there an available locale in the Wiki's language?
1088                 $wikiLang = $this->getVar( 'wgLanguageCode' );
1089
1090                 if ( isset( $candidatesByLang[$wikiLang] ) ) {
1091                         $m = reset( $candidatesByLang[$wikiLang] );
1092                         $this->setVar( 'wgShellLocale', $m[0] );
1093
1094                         return true;
1095                 }
1096
1097                 # Are there any at all?
1098                 if ( count( $candidatesByLocale ) ) {
1099                         $m = reset( $candidatesByLocale );
1100                         $this->setVar( 'wgShellLocale', $m[0] );
1101
1102                         return true;
1103                 }
1104
1105                 # Give up.
1106                 return true;
1107         }
1108
1109         /**
1110          * Environment check for the permissions of the uploads directory
1111          * @return bool
1112          */
1113         protected function envCheckUploadsDirectory() {
1114                 global $IP;
1115
1116                 $dir = $IP . '/images/';
1117                 $url = $this->getVar( 'wgServer' ) . $this->getVar( 'wgScriptPath' ) . '/images/';
1118                 $safe = !$this->dirIsExecutable( $dir, $url );
1119
1120                 if ( !$safe ) {
1121                         $this->showMessage( 'config-uploads-not-safe', $dir );
1122                 }
1123
1124                 return true;
1125         }
1126
1127         /**
1128          * Checks if suhosin.get.max_value_length is set, and if so generate
1129          * a warning because it decreases ResourceLoader performance.
1130          * @return bool
1131          */
1132         protected function envCheckSuhosinMaxValueLength() {
1133                 $maxValueLength = ini_get( 'suhosin.get.max_value_length' );
1134                 if ( $maxValueLength > 0 && $maxValueLength < 1024 ) {
1135                         // Only warn if the value is below the sane 1024
1136                         $this->showMessage( 'config-suhosin-max-value-length', $maxValueLength );
1137                 }
1138
1139                 return true;
1140         }
1141
1142         /**
1143          * Convert a hex string representing a Unicode code point to that code point.
1144          * @param $c String
1145          * @return string
1146          */
1147         protected function unicodeChar( $c ) {
1148                 $c = hexdec( $c );
1149                 if ( $c <= 0x7F ) {
1150                         return chr( $c );
1151                 } elseif ( $c <= 0x7FF ) {
1152                         return chr( 0xC0 | $c >> 6 ) . chr( 0x80 | $c & 0x3F );
1153                 } elseif ( $c <= 0xFFFF ) {
1154                         return chr( 0xE0 | $c >> 12 ) . chr( 0x80 | $c >> 6 & 0x3F )
1155                         . chr( 0x80 | $c & 0x3F );
1156                 } elseif ( $c <= 0x10FFFF ) {
1157                         return chr( 0xF0 | $c >> 18 ) . chr( 0x80 | $c >> 12 & 0x3F )
1158                         . chr( 0x80 | $c >> 6 & 0x3F )
1159                         . chr( 0x80 | $c & 0x3F );
1160                 } else {
1161                         return false;
1162                 }
1163         }
1164
1165         /**
1166          * Check the libicu version
1167          */
1168         protected function envCheckLibicu() {
1169                 $utf8 = function_exists( 'utf8_normalize' );
1170                 $intl = function_exists( 'normalizer_normalize' );
1171
1172                 /**
1173                  * This needs to be updated something that the latest libicu
1174                  * will properly normalize.  This normalization was found at
1175                  * http://www.unicode.org/versions/Unicode5.2.0/#Character_Additions
1176                  * Note that we use the hex representation to create the code
1177                  * points in order to avoid any Unicode-destroying during transit.
1178                  */
1179                 $not_normal_c = $this->unicodeChar( "FA6C" );
1180                 $normal_c = $this->unicodeChar( "242EE" );
1181
1182                 $useNormalizer = 'php';
1183                 $needsUpdate = false;
1184
1185                 /**
1186                  * We're going to prefer the pecl extension here unless
1187                  * utf8_normalize is more up to date.
1188                  */
1189                 if ( $utf8 ) {
1190                         $useNormalizer = 'utf8';
1191                         $utf8 = utf8_normalize( $not_normal_c, UtfNormal::UNORM_NFC );
1192                         if ( $utf8 !== $normal_c ) {
1193                                 $needsUpdate = true;
1194                         }
1195                 }
1196                 if ( $intl ) {
1197                         $useNormalizer = 'intl';
1198                         $intl = normalizer_normalize( $not_normal_c, Normalizer::FORM_C );
1199                         if ( $intl !== $normal_c ) {
1200                                 $needsUpdate = true;
1201                         }
1202                 }
1203
1204                 // Uses messages 'config-unicode-using-php', 'config-unicode-using-utf8',
1205                 // 'config-unicode-using-intl'
1206                 if ( $useNormalizer === 'php' ) {
1207                         $this->showMessage( 'config-unicode-pure-php-warning' );
1208                 } else {
1209                         $this->showMessage( 'config-unicode-using-' . $useNormalizer );
1210                         if ( $needsUpdate ) {
1211                                 $this->showMessage( 'config-unicode-update-warning' );
1212                         }
1213                 }
1214         }
1215
1216         /**
1217          * @return bool
1218          */
1219         protected function envCheckCtype() {
1220                 if ( !function_exists( 'ctype_digit' ) ) {
1221                         $this->showError( 'config-ctype' );
1222
1223                         return false;
1224                 }
1225
1226                 return true;
1227         }
1228
1229         /**
1230          * @return bool
1231          */
1232         protected function envCheckJSON() {
1233                 if ( !function_exists( 'json_decode' ) ) {
1234                         $this->showError( 'config-json' );
1235
1236                         return false;
1237                 }
1238
1239                 return true;
1240         }
1241
1242         /**
1243          * Get an array of likely places we can find executables. Check a bunch
1244          * of known Unix-like defaults, as well as the PATH environment variable
1245          * (which should maybe make it work for Windows?)
1246          *
1247          * @return Array
1248          */
1249         protected static function getPossibleBinPaths() {
1250                 return array_merge(
1251                         array( '/usr/bin', '/usr/local/bin', '/opt/csw/bin',
1252                                 '/usr/gnu/bin', '/usr/sfw/bin', '/sw/bin', '/opt/local/bin' ),
1253                         explode( PATH_SEPARATOR, getenv( 'PATH' ) )
1254                 );
1255         }
1256
1257         /**
1258          * Search a path for any of the given executable names. Returns the
1259          * executable name if found. Also checks the version string returned
1260          * by each executable.
1261          *
1262          * Used only by environment checks.
1263          *
1264          * @param string $path path to search
1265          * @param array $names of executable names
1266          * @param $versionInfo Boolean false or array with two members:
1267          *         0 => Command to run for version check, with $1 for the full executable name
1268          *         1 => String to compare the output with
1269          *
1270          * If $versionInfo is not false, only executables with a version
1271          * matching $versionInfo[1] will be returned.
1272          * @return bool|string
1273          */
1274         public static function locateExecutable( $path, $names, $versionInfo = false ) {
1275                 if ( !is_array( $names ) ) {
1276                         $names = array( $names );
1277                 }
1278
1279                 foreach ( $names as $name ) {
1280                         $command = $path . DIRECTORY_SEPARATOR . $name;
1281
1282                         wfSuppressWarnings();
1283                         $file_exists = file_exists( $command );
1284                         wfRestoreWarnings();
1285
1286                         if ( $file_exists ) {
1287                                 if ( !$versionInfo ) {
1288                                         return $command;
1289                                 }
1290
1291                                 $file = str_replace( '$1', wfEscapeShellArg( $command ), $versionInfo[0] );
1292                                 if ( strstr( wfShellExec( $file ), $versionInfo[1] ) !== false ) {
1293                                         return $command;
1294                                 }
1295                         }
1296                 }
1297
1298                 return false;
1299         }
1300
1301         /**
1302          * Same as locateExecutable(), but checks in getPossibleBinPaths() by default
1303          * @see locateExecutable()
1304          * @param array $names Array of possible names.
1305          * @param array|bool $versionInfo Default: false or array with two members:
1306          *         0 => Command to run for version check, with $1 for the full executable name
1307          *         1 => String to compare the output with
1308          *
1309          * If $versionInfo is not false, only executables with a version
1310          * matching $versionInfo[1] will be returned.
1311          * @return bool|string
1312          */
1313         public static function locateExecutableInDefaultPaths( $names, $versionInfo = false ) {
1314                 foreach ( self::getPossibleBinPaths() as $path ) {
1315                         $exe = self::locateExecutable( $path, $names, $versionInfo );
1316                         if ( $exe !== false ) {
1317                                 return $exe;
1318                         }
1319                 }
1320
1321                 return false;
1322         }
1323
1324         /**
1325          * Checks if scripts located in the given directory can be executed via the given URL.
1326          *
1327          * Used only by environment checks.
1328          * @param $dir string
1329          * @param $url string
1330          * @return bool|int|string
1331          */
1332         public function dirIsExecutable( $dir, $url ) {
1333                 $scriptTypes = array(
1334                         'php' => array(
1335                                 "<?php echo 'ex' . 'ec';",
1336                                 "#!/var/env php5\n<?php echo 'ex' . 'ec';",
1337                         ),
1338                 );
1339
1340                 // it would be good to check other popular languages here, but it'll be slow.
1341
1342                 wfSuppressWarnings();
1343
1344                 foreach ( $scriptTypes as $ext => $contents ) {
1345                         foreach ( $contents as $source ) {
1346                                 $file = 'exectest.' . $ext;
1347
1348                                 if ( !file_put_contents( $dir . $file, $source ) ) {
1349                                         break;
1350                                 }
1351
1352                                 try {
1353                                         $text = Http::get( $url . $file, array( 'timeout' => 3 ) );
1354                                 } catch ( MWException $e ) {
1355                                         // Http::get throws with allow_url_fopen = false and no curl extension.
1356                                         $text = null;
1357                                 }
1358                                 unlink( $dir . $file );
1359
1360                                 if ( $text == 'exec' ) {
1361                                         wfRestoreWarnings();
1362
1363                                         return $ext;
1364                                 }
1365                         }
1366                 }
1367
1368                 wfRestoreWarnings();
1369
1370                 return false;
1371         }
1372
1373         /**
1374          * Checks for presence of an Apache module. Works only if PHP is running as an Apache module, too.
1375          *
1376          * @param string $moduleName Name of module to check.
1377          * @return bool
1378          */
1379         public static function apacheModulePresent( $moduleName ) {
1380                 if ( function_exists( 'apache_get_modules' ) && in_array( $moduleName, apache_get_modules() ) ) {
1381                         return true;
1382                 }
1383                 // try it the hard way
1384                 ob_start();
1385                 phpinfo( INFO_MODULES );
1386                 $info = ob_get_clean();
1387
1388                 return strpos( $info, $moduleName ) !== false;
1389         }
1390
1391         /**
1392          * ParserOptions are constructed before we determined the language, so fix it
1393          *
1394          * @param $lang Language
1395          */
1396         public function setParserLanguage( $lang ) {
1397                 $this->parserOptions->setTargetLanguage( $lang );
1398                 $this->parserOptions->setUserLang( $lang );
1399         }
1400
1401         /**
1402          * Overridden by WebInstaller to provide lastPage parameters.
1403          * @param $page string
1404          * @return string
1405          */
1406         protected function getDocUrl( $page ) {
1407                 return "{$_SERVER['PHP_SELF']}?page=" . urlencode( $page );
1408         }
1409
1410         /**
1411          * Finds extensions that follow the format /extensions/Name/Name.php,
1412          * and returns an array containing the value for 'Name' for each found extension.
1413          *
1414          * @return array
1415          */
1416         public function findExtensions() {
1417                 if ( $this->getVar( 'IP' ) === null ) {
1418                         return array();
1419                 }
1420
1421                 $extDir = $this->getVar( 'IP' ) . '/extensions';
1422                 if ( !is_readable( $extDir ) || !is_dir( $extDir ) ) {
1423                         return array();
1424                 }
1425
1426                 $dh = opendir( $extDir );
1427                 $exts = array();
1428                 while ( ( $file = readdir( $dh ) ) !== false ) {
1429                         if ( !is_dir( "$extDir/$file" ) ) {
1430                                 continue;
1431                         }
1432                         if ( file_exists( "$extDir/$file/$file.php" ) ) {
1433                                 $exts[] = $file;
1434                         }
1435                 }
1436                 closedir( $dh );
1437                 natcasesort( $exts );
1438
1439                 return $exts;
1440         }
1441
1442         /**
1443          * Installs the auto-detected extensions.
1444          *
1445          * @return Status
1446          */
1447         protected function includeExtensions() {
1448                 global $IP;
1449                 $exts = $this->getVar( '_Extensions' );
1450                 $IP = $this->getVar( 'IP' );
1451
1452                 /**
1453                  * We need to include DefaultSettings before including extensions to avoid
1454                  * warnings about unset variables. However, the only thing we really
1455                  * want here is $wgHooks['LoadExtensionSchemaUpdates']. This won't work
1456                  * if the extension has hidden hook registration in $wgExtensionFunctions,
1457                  * but we're not opening that can of worms
1458                  * @see https://bugzilla.wikimedia.org/show_bug.cgi?id=26857
1459                  */
1460                 global $wgAutoloadClasses;
1461                 $wgAutoloadClasses = array();
1462
1463                 require "$IP/includes/DefaultSettings.php";
1464
1465                 foreach ( $exts as $e ) {
1466                         require_once "$IP/extensions/$e/$e.php";
1467                 }
1468
1469                 $hooksWeWant = isset( $wgHooks['LoadExtensionSchemaUpdates'] ) ?
1470                         $wgHooks['LoadExtensionSchemaUpdates'] : array();
1471
1472                 // Unset everyone else's hooks. Lord knows what someone might be doing
1473                 // in ParserFirstCallInit (see bug 27171)
1474                 $GLOBALS['wgHooks'] = array( 'LoadExtensionSchemaUpdates' => $hooksWeWant );
1475
1476                 return Status::newGood();
1477         }
1478
1479         /**
1480          * Get an array of install steps. Should always be in the format of
1481          * array(
1482          *   'name'     => 'someuniquename',
1483          *   'callback' => array( $obj, 'method' ),
1484          * )
1485          * There must be a config-install-$name message defined per step, which will
1486          * be shown on install.
1487          *
1488          * @param $installer DatabaseInstaller so we can make callbacks
1489          * @return array
1490          */
1491         protected function getInstallSteps( DatabaseInstaller $installer ) {
1492                 $coreInstallSteps = array(
1493                         array( 'name' => 'database', 'callback' => array( $installer, 'setupDatabase' ) ),
1494                         array( 'name' => 'tables', 'callback' => array( $installer, 'createTables' ) ),
1495                         array( 'name' => 'interwiki', 'callback' => array( $installer, 'populateInterwikiTable' ) ),
1496                         array( 'name' => 'stats', 'callback' => array( $this, 'populateSiteStats' ) ),
1497                         array( 'name' => 'keys', 'callback' => array( $this, 'generateKeys' ) ),
1498                         array( 'name' => 'sysop', 'callback' => array( $this, 'createSysop' ) ),
1499                         array( 'name' => 'mainpage', 'callback' => array( $this, 'createMainpage' ) ),
1500                 );
1501
1502                 // Build the array of install steps starting from the core install list,
1503                 // then adding any callbacks that wanted to attach after a given step
1504                 foreach ( $coreInstallSteps as $step ) {
1505                         $this->installSteps[] = $step;
1506                         if ( isset( $this->extraInstallSteps[$step['name']] ) ) {
1507                                 $this->installSteps = array_merge(
1508                                         $this->installSteps,
1509                                         $this->extraInstallSteps[$step['name']]
1510                                 );
1511                         }
1512                 }
1513
1514                 // Prepend any steps that want to be at the beginning
1515                 if ( isset( $this->extraInstallSteps['BEGINNING'] ) ) {
1516                         $this->installSteps = array_merge(
1517                                 $this->extraInstallSteps['BEGINNING'],
1518                                 $this->installSteps
1519                         );
1520                 }
1521
1522                 // Extensions should always go first, chance to tie into hooks and such
1523                 if ( count( $this->getVar( '_Extensions' ) ) ) {
1524                         array_unshift( $this->installSteps,
1525                                 array( 'name' => 'extensions', 'callback' => array( $this, 'includeExtensions' ) )
1526                         );
1527                         $this->installSteps[] = array(
1528                                 'name' => 'extension-tables',
1529                                 'callback' => array( $installer, 'createExtensionTables' )
1530                         );
1531                 }
1532
1533                 return $this->installSteps;
1534         }
1535
1536         /**
1537          * Actually perform the installation.
1538          *
1539          * @param array $startCB A callback array for the beginning of each step
1540          * @param array $endCB A callback array for the end of each step
1541          *
1542          * @return Array of Status objects
1543          */
1544         public function performInstallation( $startCB, $endCB ) {
1545                 $installResults = array();
1546                 $installer = $this->getDBInstaller();
1547                 $installer->preInstall();
1548                 $steps = $this->getInstallSteps( $installer );
1549                 foreach ( $steps as $stepObj ) {
1550                         $name = $stepObj['name'];
1551                         call_user_func_array( $startCB, array( $name ) );
1552
1553                         // Perform the callback step
1554                         $status = call_user_func( $stepObj['callback'], $installer );
1555
1556                         // Output and save the results
1557                         call_user_func( $endCB, $name, $status );
1558                         $installResults[$name] = $status;
1559
1560                         // If we've hit some sort of fatal, we need to bail.
1561                         // Callback already had a chance to do output above.
1562                         if ( !$status->isOk() ) {
1563                                 break;
1564                         }
1565                 }
1566                 if ( $status->isOk() ) {
1567                         $this->setVar( '_InstallDone', true );
1568                 }
1569
1570                 return $installResults;
1571         }
1572
1573         /**
1574          * Generate $wgSecretKey. Will warn if we had to use an insecure random source.
1575          *
1576          * @return Status
1577          */
1578         public function generateKeys() {
1579                 $keys = array( 'wgSecretKey' => 64 );
1580                 if ( strval( $this->getVar( 'wgUpgradeKey' ) ) === '' ) {
1581                         $keys['wgUpgradeKey'] = 16;
1582                 }
1583
1584                 return $this->doGenerateKeys( $keys );
1585         }
1586
1587         /**
1588          * Generate a secret value for variables using our CryptRand generator.
1589          * Produce a warning if the random source was insecure.
1590          *
1591          * @param $keys Array
1592          * @return Status
1593          */
1594         protected function doGenerateKeys( $keys ) {
1595                 $status = Status::newGood();
1596
1597                 $strong = true;
1598                 foreach ( $keys as $name => $length ) {
1599                         $secretKey = MWCryptRand::generateHex( $length, true );
1600                         if ( !MWCryptRand::wasStrong() ) {
1601                                 $strong = false;
1602                         }
1603
1604                         $this->setVar( $name, $secretKey );
1605                 }
1606
1607                 if ( !$strong ) {
1608                         $names = array_keys( $keys );
1609                         $names = preg_replace( '/^(.*)$/', '\$$1', $names );
1610                         global $wgLang;
1611                         $status->warning( 'config-insecure-keys', $wgLang->listToText( $names ), count( $names ) );
1612                 }
1613
1614                 return $status;
1615         }
1616
1617         /**
1618          * Create the first user account, grant it sysop and bureaucrat rights
1619          *
1620          * @return Status
1621          */
1622         protected function createSysop() {
1623                 $name = $this->getVar( '_AdminName' );
1624                 $user = User::newFromName( $name );
1625
1626                 if ( !$user ) {
1627                         // We should've validated this earlier anyway!
1628                         return Status::newFatal( 'config-admin-error-user', $name );
1629                 }
1630
1631                 if ( $user->idForName() == 0 ) {
1632                         $user->addToDatabase();
1633
1634                         try {
1635                                 $user->setPassword( $this->getVar( '_AdminPassword' ) );
1636                         } catch ( PasswordError $pwe ) {
1637                                 return Status::newFatal( 'config-admin-error-password', $name, $pwe->getMessage() );
1638                         }
1639
1640                         $user->addGroup( 'sysop' );
1641                         $user->addGroup( 'bureaucrat' );
1642                         if ( $this->getVar( '_AdminEmail' ) ) {
1643                                 $user->setEmail( $this->getVar( '_AdminEmail' ) );
1644                         }
1645                         $user->saveSettings();
1646
1647                         // Update user count
1648                         $ssUpdate = new SiteStatsUpdate( 0, 0, 0, 0, 1 );
1649                         $ssUpdate->doUpdate();
1650                 }
1651                 $status = Status::newGood();
1652
1653                 if ( $this->getVar( '_Subscribe' ) && $this->getVar( '_AdminEmail' ) ) {
1654                         $this->subscribeToMediaWikiAnnounce( $status );
1655                 }
1656
1657                 return $status;
1658         }
1659
1660         /**
1661          * @param $s Status
1662          */
1663         private function subscribeToMediaWikiAnnounce( Status $s ) {
1664                 $params = array(
1665                         'email' => $this->getVar( '_AdminEmail' ),
1666                         'language' => 'en',
1667                         'digest' => 0
1668                 );
1669
1670                 // Mailman doesn't support as many languages as we do, so check to make
1671                 // sure their selected language is available
1672                 $myLang = $this->getVar( '_UserLang' );
1673                 if ( in_array( $myLang, $this->mediaWikiAnnounceLanguages ) ) {
1674                         $myLang = $myLang == 'pt-br' ? 'pt_BR' : $myLang; // rewrite to Mailman's pt_BR
1675                         $params['language'] = $myLang;
1676                 }
1677
1678                 if ( MWHttpRequest::canMakeRequests() ) {
1679                         $res = MWHttpRequest::factory( $this->mediaWikiAnnounceUrl,
1680                                 array( 'method' => 'POST', 'postData' => $params ) )->execute();
1681                         if ( !$res->isOK() ) {
1682                                 $s->warning( 'config-install-subscribe-fail', $res->getMessage() );
1683                         }
1684                 } else {
1685                         $s->warning( 'config-install-subscribe-notpossible' );
1686                 }
1687         }
1688
1689         /**
1690          * Insert Main Page with default content.
1691          *
1692          * @param $installer DatabaseInstaller
1693          * @return Status
1694          */
1695         protected function createMainpage( DatabaseInstaller $installer ) {
1696                 $status = Status::newGood();
1697                 try {
1698                         $page = WikiPage::factory( Title::newMainPage() );
1699                         $content = new WikitextContent(
1700                                 wfMessage( 'mainpagetext' )->inContentLanguage()->text() . "\n\n" .
1701                                 wfMessage( 'mainpagedocfooter' )->inContentLanguage()->text()
1702                         );
1703
1704                         $page->doEditContent( $content,
1705                                 '',
1706                                 EDIT_NEW,
1707                                 false,
1708                                 User::newFromName( 'MediaWiki default' )
1709                         );
1710                 } catch ( MWException $e ) {
1711                         //using raw, because $wgShowExceptionDetails can not be set yet
1712                         $status->fatal( 'config-install-mainpage-failed', $e->getMessage() );
1713                 }
1714
1715                 return $status;
1716         }
1717
1718         /**
1719          * Override the necessary bits of the config to run an installation.
1720          */
1721         public static function overrideConfig() {
1722                 define( 'MW_NO_SESSION', 1 );
1723
1724                 // Don't access the database
1725                 $GLOBALS['wgUseDatabaseMessages'] = false;
1726                 // Don't cache langconv tables
1727                 $GLOBALS['wgLanguageConverterCacheType'] = CACHE_NONE;
1728                 // Debug-friendly
1729                 $GLOBALS['wgShowExceptionDetails'] = true;
1730                 // Don't break forms
1731                 $GLOBALS['wgExternalLinkTarget'] = '_blank';
1732
1733                 // Extended debugging
1734                 $GLOBALS['wgShowSQLErrors'] = true;
1735                 $GLOBALS['wgShowDBErrorBacktrace'] = true;
1736
1737                 // Allow multiple ob_flush() calls
1738                 $GLOBALS['wgDisableOutputCompression'] = true;
1739
1740                 // Use a sensible cookie prefix (not my_wiki)
1741                 $GLOBALS['wgCookiePrefix'] = 'mw_installer';
1742
1743                 // Some of the environment checks make shell requests, remove limits
1744                 $GLOBALS['wgMaxShellMemory'] = 0;
1745
1746                 // Don't bother embedding images into generated CSS, which is not cached
1747                 $GLOBALS['wgResourceLoaderLESSFunctions']['embeddable'] = function ( $frame, $less ) {
1748                         return $less->toBool( false );
1749                 };
1750         }
1751
1752         /**
1753          * Add an installation step following the given step.
1754          *
1755          * @param array $callback A valid installation callback array, in this form:
1756          *    array( 'name' => 'some-unique-name', 'callback' => array( $obj, 'function' ) );
1757          * @param string $findStep the step to find. Omit to put the step at the beginning
1758          */
1759         public function addInstallStep( $callback, $findStep = 'BEGINNING' ) {
1760                 $this->extraInstallSteps[$findStep][] = $callback;
1761         }
1762
1763         /**
1764          * Disable the time limit for execution.
1765          * Some long-running pages (Install, Upgrade) will want to do this
1766          */
1767         protected function disableTimeLimit() {
1768                 wfSuppressWarnings();
1769                 set_time_limit( 0 );
1770                 wfRestoreWarnings();
1771         }
1772 }