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                 'wgServer',
 162                 'wgScriptPath',
 163                 'wgScriptExtension',
 164                 'wgMetaNamespace',
 165                 'wgDeletedDirectory',
 166                 'wgEnableUploads',
 167                 'wgLogo',
 168                 'wgShellLocale',
 169                 'wgSecretKey',
 170                 'wgUseInstantCommons',
 171                 'wgUpgradeKey',
 172                 'wgDefaultSkin',
 173                 'wgResourceLoaderMaxQueryLength',
 174         );
 175
 176         /**
 177          * Variables that are stored alongside globals, and are used for any
 178          * configuration of the installation process aside from the MediaWiki
 179          * configuration. Map of names to defaults.
 180          *
 181          * @var array
 182          */
 183         protected $internalDefaults = array(
 184                 '_UserLang' => 'en',
 185                 '_Environment' => false,
 186                 '_SafeMode' => false,
 187                 '_RaiseMemory' => false,
 188                 '_UpgradeDone' => false,
 189                 '_InstallDone' => false,
 190                 '_Caches' => array(),
 191                 '_InstallPassword' => '',
 192                 '_SameAccount' => true,
 193                 '_CreateDBAccount' => false,
 194                 '_NamespaceType' => 'site-name',
 195                 '_AdminName' => '', // will be set later, when the user selects language
 196                 '_AdminPassword' => '',
 197                 '_AdminPassword2' => '',
 198                 '_AdminEmail' => '',
 199                 '_Subscribe' => false,
 200                 '_SkipOptional' => 'continue',
 201                 '_RightsProfile' => 'wiki',
 202                 '_LicenseCode' => 'none',
 203                 '_CCDone' => false,
 204                 '_Extensions' => array(),
 205                 '_MemCachedServers' => '',
 206                 '_UpgradeKeySupplied' => false,
 207                 '_ExistingDBSettings' => false,
 208         );
 209
 210         /**
 211          * The actual list of installation steps. This will be initialized by getInstallSteps()
 212          *
 213          * @var array
 214          */
 215         private $installSteps = array();
 216
 217         /**
 218          * Extra steps for installation, for things like DatabaseInstallers to modify
 219          *
 220          * @var array
 221          */
 222         protected $extraInstallSteps = array();
 223
 224         /**
 225          * Known object cache types and the functions used to test for their existence.
 226          *
 227          * @var array
 228          */
 229         protected $objectCaches = array(
 230                 'xcache' => 'xcache_get',
 231                 'apc' => 'apc_fetch',
 232                 'wincache' => 'wincache_ucache_get'
 233         );
 234
 235         /**
 236          * User rights profiles.
 237          *
 238          * @var array
 239          */
 240         public $rightsProfiles = array(
 241                 'wiki' => array(),
 242                 'no-anon' => array(
 243                         '*' => array( 'edit' => false )
 244                 ),
 245                 'fishbowl' => array(
 246                         '*' => array(
 247                                 'createaccount' => false,
 248                                 'edit' => false,
 249                         ),
 250                 ),
 251                 'private' => array(
 252                         '*' => array(
 253                                 'createaccount' => false,
 254                                 'edit' => false,
 255                                 'read' => false,
 256                         ),
 257                 ),
 258         );
 259
 260         /**
 261          * License types.
 262          *
 263          * @var array
 264          */
 265         public $licenses = array(
 266                 'cc-by' => array(
 267                         'url' => 'http://creativecommons.org/licenses/by/3.0/',
 268                         'icon' => '{$wgStylePath}/common/images/cc-by.png',
 269                 ),
 270                 'cc-by-sa' => array(
 271                         'url' => 'http://creativecommons.org/licenses/by-sa/3.0/',
 272                         'icon' => '{$wgStylePath}/common/images/cc-by-sa.png',
 273                 ),
 274                 'cc-by-nc-sa' => array(
 275                         'url' => 'http://creativecommons.org/licenses/by-nc-sa/3.0/',
 276                         'icon' => '{$wgStylePath}/common/images/cc-by-nc-sa.png',
 277                 ),
 278                 'cc-0' => array(
 279                         'url' => 'https://creativecommons.org/publicdomain/zero/1.0/',
 280                         'icon' => '{$wgStylePath}/common/images/cc-0.png',
 281                 ),
 282                 'pd' => array(
 283                         'url' => '',
 284                         'icon' => '{$wgStylePath}/common/images/public-domain.png',
 285                 ),
 286                 'gfdl' => array(
 287                         'url' => 'http://www.gnu.org/copyleft/fdl.html',
 288                         'icon' => '{$wgStylePath}/common/images/gnu-fdl.png',
 289                 ),
 290                 'none' => array(
 291                         'url' => '',
 292                         'icon' => '',
 293                         'text' => ''
 294                 ),
 295                 'cc-choose' => array(
 296                         // Details will be filled in by the selector.
 297                         'url' => '',
 298                         'icon' => '',
 299                         'text' => '',
 300                 ),
 301         );
 302
 303         /**
 304          * URL to mediawiki-announce subscription
 305          */
 306         protected $mediaWikiAnnounceUrl = '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                 $this->showMessage( 'config-using-server', $server );
 984                 $this->setVar( 'wgServer', $server );
 985
 986                 return true;
 987         }
 988
 989         /**
 990          * Helper function to be called from envCheckServer()
 991          * @return String
 992          */
 993         abstract protected function envGetDefaultServer();
 994
 995         /**
 996          * Environment check for setting $IP and $wgScriptPath.
 997          * @return bool
 998          */
 999         protected function envCheckPath() {
1000                 global $IP;
1001                 $IP = dirname( dirname( __DIR__ ) );
1002                 $this->setVar( 'IP', $IP );
1003
1004                 $this->showMessage( 'config-using-uri', $this->getVar( 'wgServer' ), $this->getVar( 'wgScriptPath' ) );
1005
1006                 return true;
1007         }
1008
1009         /**
1010          * Environment check for setting the preferred PHP file extension.
1011          * @return bool
1012          */
1013         protected function envCheckExtension() {
1014                 // @todo FIXME: Detect this properly
1015                 if ( defined( 'MW_INSTALL_PHP5_EXT' ) ) {
1016                         $ext = 'php5';
1017                 } else {
1018                         $ext = 'php';
1019                 }
1020                 $this->setVar( 'wgScriptExtension', ".$ext" );
1021
1022                 return true;
1023         }
1024
1025         /**
1026          * Environment check for preferred locale in shell
1027          * @return bool
1028          */
1029         protected function envCheckShellLocale() {
1030                 $os = php_uname( 's' );
1031                 $supported = array( 'Linux', 'SunOS', 'HP-UX', 'Darwin' ); # Tested these
1032
1033                 if ( !in_array( $os, $supported ) ) {
1034                         return true;
1035                 }
1036
1037                 # Get a list of available locales.
1038                 $ret = false;
1039                 $lines = wfShellExec( '/usr/bin/locale -a', $ret );
1040
1041                 if ( $ret ) {
1042                         return true;
1043                 }
1044
1045                 $lines = array_map( 'trim', explode( "\n", $lines ) );
1046                 $candidatesByLocale = array();
1047                 $candidatesByLang = array();
1048
1049                 foreach ( $lines as $line ) {
1050                         if ( $line === '' ) {
1051                                 continue;
1052                         }
1053
1054                         if ( !preg_match( '/^([a-zA-Z]+)(_[a-zA-Z]+|)\.(utf8|UTF-8)(@[a-zA-Z_]*|)$/i', $line, $m ) ) {
1055                                 continue;
1056                         }
1057
1058                         list( , $lang, , , ) = $m;
1059
1060                         $candidatesByLocale[$m[0]] = $m;
1061                         $candidatesByLang[$lang][] = $m;
1062                 }
1063
1064                 # Try the current value of LANG.
1065                 if ( isset( $candidatesByLocale[getenv( 'LANG' )] ) ) {
1066                         $this->setVar( 'wgShellLocale', getenv( 'LANG' ) );
1067
1068                         return true;
1069                 }
1070
1071                 # Try the most common ones.
1072                 $commonLocales = array( 'en_US.UTF-8', 'en_US.utf8', 'de_DE.UTF-8', 'de_DE.utf8' );
1073                 foreach ( $commonLocales as $commonLocale ) {
1074                         if ( isset( $candidatesByLocale[$commonLocale] ) ) {
1075                                 $this->setVar( 'wgShellLocale', $commonLocale );
1076
1077                                 return true;
1078                         }
1079                 }
1080
1081                 # Is there an available locale in the Wiki's language?
1082                 $wikiLang = $this->getVar( 'wgLanguageCode' );
1083
1084                 if ( isset( $candidatesByLang[$wikiLang] ) ) {
1085                         $m = reset( $candidatesByLang[$wikiLang] );
1086                         $this->setVar( 'wgShellLocale', $m[0] );
1087
1088                         return true;
1089                 }
1090
1091                 # Are there any at all?
1092                 if ( count( $candidatesByLocale ) ) {
1093                         $m = reset( $candidatesByLocale );
1094                         $this->setVar( 'wgShellLocale', $m[0] );
1095
1096                         return true;
1097                 }
1098
1099                 # Give up.
1100                 return true;
1101         }
1102
1103         /**
1104          * Environment check for the permissions of the uploads directory
1105          * @return bool
1106          */
1107         protected function envCheckUploadsDirectory() {
1108                 global $IP;
1109
1110                 $dir = $IP . '/images/';
1111                 $url = $this->getVar( 'wgServer' ) . $this->getVar( 'wgScriptPath' ) . '/images/';
1112                 $safe = !$this->dirIsExecutable( $dir, $url );
1113
1114                 if ( !$safe ) {
1115                         $this->showMessage( 'config-uploads-not-safe', $dir );
1116                 }
1117
1118                 return true;
1119         }
1120
1121         /**
1122          * Checks if suhosin.get.max_value_length is set, and if so generate
1123          * a warning because it decreases ResourceLoader performance.
1124          * @return bool
1125          */
1126         protected function envCheckSuhosinMaxValueLength() {
1127                 $maxValueLength = ini_get( 'suhosin.get.max_value_length' );
1128                 if ( $maxValueLength > 0 && $maxValueLength < 1024 ) {
1129                         // Only warn if the value is below the sane 1024
1130                         $this->showMessage( 'config-suhosin-max-value-length', $maxValueLength );
1131                 }
1132
1133                 return true;
1134         }
1135
1136         /**
1137          * Convert a hex string representing a Unicode code point to that code point.
1138          * @param $c String
1139          * @return string
1140          */
1141         protected function unicodeChar( $c ) {
1142                 $c = hexdec( $c );
1143                 if ( $c <= 0x7F ) {
1144                         return chr( $c );
1145                 } elseif ( $c <= 0x7FF ) {
1146                         return chr( 0xC0 | $c >> 6 ) . chr( 0x80 | $c & 0x3F );
1147                 } elseif ( $c <= 0xFFFF ) {
1148                         return chr( 0xE0 | $c >> 12 ) . chr( 0x80 | $c >> 6 & 0x3F )
1149                                 . chr( 0x80 | $c & 0x3F );
1150                 } elseif ( $c <= 0x10FFFF ) {
1151                         return chr( 0xF0 | $c >> 18 ) . chr( 0x80 | $c >> 12 & 0x3F )
1152                                 . chr( 0x80 | $c >> 6 & 0x3F )
1153                                 . chr( 0x80 | $c & 0x3F );
1154                 } else {
1155                         return false;
1156                 }
1157         }
1158
1159         /**
1160          * Check the libicu version
1161          */
1162         protected function envCheckLibicu() {
1163                 $utf8 = function_exists( 'utf8_normalize' );
1164                 $intl = function_exists( 'normalizer_normalize' );
1165
1166                 /**
1167                  * This needs to be updated something that the latest libicu
1168                  * will properly normalize.  This normalization was found at
1169                  * http://www.unicode.org/versions/Unicode5.2.0/#Character_Additions
1170                  * Note that we use the hex representation to create the code
1171                  * points in order to avoid any Unicode-destroying during transit.
1172                  */
1173                 $not_normal_c = $this->unicodeChar( "FA6C" );
1174                 $normal_c = $this->unicodeChar( "242EE" );
1175
1176                 $useNormalizer = 'php';
1177                 $needsUpdate = false;
1178
1179                 /**
1180                  * We're going to prefer the pecl extension here unless
1181                  * utf8_normalize is more up to date.
1182                  */
1183                 if ( $utf8 ) {
1184                         $useNormalizer = 'utf8';
1185                         $utf8 = utf8_normalize( $not_normal_c, UtfNormal::UNORM_NFC );
1186                         if ( $utf8 !== $normal_c ) {
1187                                 $needsUpdate = true;
1188                         }
1189                 }
1190                 if ( $intl ) {
1191                         $useNormalizer = 'intl';
1192                         $intl = normalizer_normalize( $not_normal_c, Normalizer::FORM_C );
1193                         if ( $intl !== $normal_c ) {
1194                                 $needsUpdate = true;
1195                         }
1196                 }
1197
1198                 // Uses messages 'config-unicode-using-php', 'config-unicode-using-utf8', 'config-unicode-using-intl'
1199                 if ( $useNormalizer === 'php' ) {
1200                         $this->showMessage( 'config-unicode-pure-php-warning' );
1201                 } else {
1202                         $this->showMessage( 'config-unicode-using-' . $useNormalizer );
1203                         if ( $needsUpdate ) {
1204                                 $this->showMessage( 'config-unicode-update-warning' );
1205                         }
1206                 }
1207         }
1208
1209         /**
1210          * @return bool
1211          */
1212         protected function envCheckCtype() {
1213                 if ( !function_exists( 'ctype_digit' ) ) {
1214                         $this->showError( 'config-ctype' );
1215
1216                         return false;
1217                 }
1218
1219                 return true;
1220         }
1221
1222         /**
1223          * @return bool
1224          */
1225         protected function envCheckJSON() {
1226                 if ( !function_exists( 'json_decode' ) ) {
1227                         $this->showError( 'config-json' );
1228
1229                         return false;
1230                 }
1231
1232                 return true;
1233         }
1234
1235         /**
1236          * Get an array of likely places we can find executables. Check a bunch
1237          * of known Unix-like defaults, as well as the PATH environment variable
1238          * (which should maybe make it work for Windows?)
1239          *
1240          * @return Array
1241          */
1242         protected static function getPossibleBinPaths() {
1243                 return array_merge(
1244                         array( '/usr/bin', '/usr/local/bin', '/opt/csw/bin',
1245                                 '/usr/gnu/bin', '/usr/sfw/bin', '/sw/bin', '/opt/local/bin' ),
1246                         explode( PATH_SEPARATOR, getenv( 'PATH' ) )
1247                 );
1248         }
1249
1250         /**
1251          * Search a path for any of the given executable names. Returns the
1252          * executable name if found. Also checks the version string returned
1253          * by each executable.
1254          *
1255          * Used only by environment checks.
1256          *
1257          * @param string $path path to search
1258          * @param array $names of executable names
1259          * @param $versionInfo Boolean false or array with two members:
1260          *         0 => Command to run for version check, with $1 for the full executable name
1261          *         1 => String to compare the output with
1262          *
1263          * If $versionInfo is not false, only executables with a version
1264          * matching $versionInfo[1] will be returned.
1265          * @return bool|string
1266          */
1267         public static function locateExecutable( $path, $names, $versionInfo = false ) {
1268                 if ( !is_array( $names ) ) {
1269                         $names = array( $names );
1270                 }
1271
1272                 foreach ( $names as $name ) {
1273                         $command = $path . DIRECTORY_SEPARATOR . $name;
1274
1275                         wfSuppressWarnings();
1276                         $file_exists = file_exists( $command );
1277                         wfRestoreWarnings();
1278
1279                         if ( $file_exists ) {
1280                                 if ( !$versionInfo ) {
1281                                         return $command;
1282                                 }
1283
1284                                 $file = str_replace( '$1', wfEscapeShellArg( $command ), $versionInfo[0] );
1285                                 if ( strstr( wfShellExec( $file ), $versionInfo[1] ) !== false ) {
1286                                         return $command;
1287                                 }
1288                         }
1289                 }
1290
1291                 return false;
1292         }
1293
1294         /**
1295          * Same as locateExecutable(), but checks in getPossibleBinPaths() by default
1296          * @see locateExecutable()
1297          * @param $names
1298          * @param $versionInfo bool
1299          * @return bool|string
1300          */
1301         public static function locateExecutableInDefaultPaths( $names, $versionInfo = false ) {
1302                 foreach ( self::getPossibleBinPaths() as $path ) {
1303                         $exe = self::locateExecutable( $path, $names, $versionInfo );
1304                         if ( $exe !== false ) {
1305                                 return $exe;
1306                         }
1307                 }
1308
1309                 return false;
1310         }
1311
1312         /**
1313          * Checks if scripts located in the given directory can be executed via the given URL.
1314          *
1315          * Used only by environment checks.
1316          * @param $dir string
1317          * @param $url string
1318          * @return bool|int|string
1319          */
1320         public function dirIsExecutable( $dir, $url ) {
1321                 $scriptTypes = array(
1322                         'php' => array(
1323                                 "<?php echo 'ex' . 'ec';",
1324                                 "#!/var/env php5\n<?php echo 'ex' . 'ec';",
1325                         ),
1326                 );
1327
1328                 // it would be good to check other popular languages here, but it'll be slow.
1329
1330                 wfSuppressWarnings();
1331
1332                 foreach ( $scriptTypes as $ext => $contents ) {
1333                         foreach ( $contents as $source ) {
1334                                 $file = 'exectest.' . $ext;
1335
1336                                 if ( !file_put_contents( $dir . $file, $source ) ) {
1337                                         break;
1338                                 }
1339
1340                                 try {
1341                                         $text = Http::get( $url . $file, array( 'timeout' => 3 ) );
1342                                 } catch ( MWException $e ) {
1343                                         // Http::get throws with allow_url_fopen = false and no curl extension.
1344                                         $text = null;
1345                                 }
1346                                 unlink( $dir . $file );
1347
1348                                 if ( $text == 'exec' ) {
1349                                         wfRestoreWarnings();
1350
1351                                         return $ext;
1352                                 }
1353                         }
1354                 }
1355
1356                 wfRestoreWarnings();
1357
1358                 return false;
1359         }
1360
1361         /**
1362          * Checks for presence of an Apache module. Works only if PHP is running as an Apache module, too.
1363          *
1364          * @param string $moduleName Name of module to check.
1365          * @return bool
1366          */
1367         public static function apacheModulePresent( $moduleName ) {
1368                 if ( function_exists( 'apache_get_modules' ) && in_array( $moduleName, apache_get_modules() ) ) {
1369                         return true;
1370                 }
1371                 // try it the hard way
1372                 ob_start();
1373                 phpinfo( INFO_MODULES );
1374                 $info = ob_get_clean();
1375
1376                 return strpos( $info, $moduleName ) !== false;
1377         }
1378
1379         /**
1380          * ParserOptions are constructed before we determined the language, so fix it
1381          *
1382          * @param $lang Language
1383          */
1384         public function setParserLanguage( $lang ) {
1385                 $this->parserOptions->setTargetLanguage( $lang );
1386                 $this->parserOptions->setUserLang( $lang );
1387         }
1388
1389         /**
1390          * Overridden by WebInstaller to provide lastPage parameters.
1391          * @param $page string
1392          * @return string
1393          */
1394         protected function getDocUrl( $page ) {
1395                 return "{$_SERVER['PHP_SELF']}?page=" . urlencode( $page );
1396         }
1397
1398         /**
1399          * Finds extensions that follow the format /extensions/Name/Name.php,
1400          * and returns an array containing the value for 'Name' for each found extension.
1401          *
1402          * @return array
1403          */
1404         public function findExtensions() {
1405                 if ( $this->getVar( 'IP' ) === null ) {
1406                         return array();
1407                 }
1408
1409                 $extDir = $this->getVar( 'IP' ) . '/extensions';
1410                 if ( !is_readable( $extDir ) || !is_dir( $extDir ) ) {
1411                         return array();
1412                 }
1413
1414                 $dh = opendir( $extDir );
1415                 $exts = array();
1416                 while ( ( $file = readdir( $dh ) ) !== false ) {
1417                         if ( !is_dir( "$extDir/$file" ) ) {
1418                                 continue;
1419                         }
1420                         if ( file_exists( "$extDir/$file/$file.php" ) ) {
1421                                 $exts[] = $file;
1422                         }
1423                 }
1424                 closedir( $dh );
1425                 natcasesort( $exts );
1426
1427                 return $exts;
1428         }
1429
1430         /**
1431          * Installs the auto-detected extensions.
1432          *
1433          * @return Status
1434          */
1435         protected function includeExtensions() {
1436                 global $IP;
1437                 $exts = $this->getVar( '_Extensions' );
1438                 $IP = $this->getVar( 'IP' );
1439
1440                 /**
1441                  * We need to include DefaultSettings before including extensions to avoid
1442                  * warnings about unset variables. However, the only thing we really
1443                  * want here is $wgHooks['LoadExtensionSchemaUpdates']. This won't work
1444                  * if the extension has hidden hook registration in $wgExtensionFunctions,
1445                  * but we're not opening that can of worms
1446                  * @see https://bugzilla.wikimedia.org/show_bug.cgi?id=26857
1447                  */
1448                 global $wgAutoloadClasses;
1449                 $wgAutoloadClasses = array();
1450
1451                 require "$IP/includes/DefaultSettings.php";
1452
1453                 foreach ( $exts as $e ) {
1454                         require_once "$IP/extensions/$e/$e.php";
1455                 }
1456
1457                 $hooksWeWant = isset( $wgHooks['LoadExtensionSchemaUpdates'] ) ?
1458                         $wgHooks['LoadExtensionSchemaUpdates'] : array();
1459
1460                 // Unset everyone else's hooks. Lord knows what someone might be doing
1461                 // in ParserFirstCallInit (see bug 27171)
1462                 $GLOBALS['wgHooks'] = array( 'LoadExtensionSchemaUpdates' => $hooksWeWant );
1463
1464                 return Status::newGood();
1465         }
1466
1467         /**
1468          * Get an array of install steps. Should always be in the format of
1469          * array(
1470          *   'name'     => 'someuniquename',
1471          *   'callback' => array( $obj, 'method' ),
1472          * )
1473          * There must be a config-install-$name message defined per step, which will
1474          * be shown on install.
1475          *
1476          * @param $installer DatabaseInstaller so we can make callbacks
1477          * @return array
1478          */
1479         protected function getInstallSteps( DatabaseInstaller $installer ) {
1480                 $coreInstallSteps = array(
1481                         array( 'name' => 'database', 'callback' => array( $installer, 'setupDatabase' ) ),
1482                         array( 'name' => 'tables', 'callback' => array( $installer, 'createTables' ) ),
1483                         array( 'name' => 'interwiki', 'callback' => array( $installer, 'populateInterwikiTable' ) ),
1484                         array( 'name' => 'stats', 'callback' => array( $this, 'populateSiteStats' ) ),
1485                         array( 'name' => 'keys', 'callback' => array( $this, 'generateKeys' ) ),
1486                         array( 'name' => 'sysop', 'callback' => array( $this, 'createSysop' ) ),
1487                         array( 'name' => 'mainpage', 'callback' => array( $this, 'createMainpage' ) ),
1488                 );
1489
1490                 // Build the array of install steps starting from the core install list,
1491                 // then adding any callbacks that wanted to attach after a given step
1492                 foreach ( $coreInstallSteps as $step ) {
1493                         $this->installSteps[] = $step;
1494                         if ( isset( $this->extraInstallSteps[$step['name']] ) ) {
1495                                 $this->installSteps = array_merge(
1496                                         $this->installSteps,
1497                                         $this->extraInstallSteps[$step['name']]
1498                                 );
1499                         }
1500                 }
1501
1502                 // Prepend any steps that want to be at the beginning
1503                 if ( isset( $this->extraInstallSteps['BEGINNING'] ) ) {
1504                         $this->installSteps = array_merge(
1505                                 $this->extraInstallSteps['BEGINNING'],
1506                                 $this->installSteps
1507                         );
1508                 }
1509
1510                 // Extensions should always go first, chance to tie into hooks and such
1511                 if ( count( $this->getVar( '_Extensions' ) ) ) {
1512                         array_unshift( $this->installSteps,
1513                                 array( 'name' => 'extensions', 'callback' => array( $this, 'includeExtensions' ) )
1514                         );
1515                         $this->installSteps[] = array(
1516                                 'name' => 'extension-tables',
1517                                 'callback' => array( $installer, 'createExtensionTables' )
1518                         );
1519                 }
1520
1521                 return $this->installSteps;
1522         }
1523
1524         /**
1525          * Actually perform the installation.
1526          *
1527          * @param array $startCB A callback array for the beginning of each step
1528          * @param array $endCB A callback array for the end of each step
1529          *
1530          * @return Array of Status objects
1531          */
1532         public function performInstallation( $startCB, $endCB ) {
1533                 $installResults = array();
1534                 $installer = $this->getDBInstaller();
1535                 $installer->preInstall();
1536                 $steps = $this->getInstallSteps( $installer );
1537                 foreach ( $steps as $stepObj ) {
1538                         $name = $stepObj['name'];
1539                         call_user_func_array( $startCB, array( $name ) );
1540
1541                         // Perform the callback step
1542                         $status = call_user_func( $stepObj['callback'], $installer );
1543
1544                         // Output and save the results
1545                         call_user_func( $endCB, $name, $status );
1546                         $installResults[$name] = $status;
1547
1548                         // If we've hit some sort of fatal, we need to bail.
1549                         // Callback already had a chance to do output above.
1550                         if ( !$status->isOk() ) {
1551                                 break;
1552                         }
1553                 }
1554                 if ( $status->isOk() ) {
1555                         $this->setVar( '_InstallDone', true );
1556                 }
1557
1558                 return $installResults;
1559         }
1560
1561         /**
1562          * Generate $wgSecretKey. Will warn if we had to use an insecure random source.
1563          *
1564          * @return Status
1565          */
1566         public function generateKeys() {
1567                 $keys = array( 'wgSecretKey' => 64 );
1568                 if ( strval( $this->getVar( 'wgUpgradeKey' ) ) === '' ) {
1569                         $keys['wgUpgradeKey'] = 16;
1570                 }
1571
1572                 return $this->doGenerateKeys( $keys );
1573         }
1574
1575         /**
1576          * Generate a secret value for variables using our CryptRand generator.
1577          * Produce a warning if the random source was insecure.
1578          *
1579          * @param $keys Array
1580          * @return Status
1581          */
1582         protected function doGenerateKeys( $keys ) {
1583                 $status = Status::newGood();
1584
1585                 $strong = true;
1586                 foreach ( $keys as $name => $length ) {
1587                         $secretKey = MWCryptRand::generateHex( $length, true );
1588                         if ( !MWCryptRand::wasStrong() ) {
1589                                 $strong = false;
1590                         }
1591
1592                         $this->setVar( $name, $secretKey );
1593                 }
1594
1595                 if ( !$strong ) {
1596                         $names = array_keys( $keys );
1597                         $names = preg_replace( '/^(.*)$/', '\$$1', $names );
1598                         global $wgLang;
1599                         $status->warning( 'config-insecure-keys', $wgLang->listToText( $names ), count( $names ) );
1600                 }
1601
1602                 return $status;
1603         }
1604
1605         /**
1606          * Create the first user account, grant it sysop and bureaucrat rights
1607          *
1608          * @return Status
1609          */
1610         protected function createSysop() {
1611                 $name = $this->getVar( '_AdminName' );
1612                 $user = User::newFromName( $name );
1613
1614                 if ( !$user ) {
1615                         // We should've validated this earlier anyway!
1616                         return Status::newFatal( 'config-admin-error-user', $name );
1617                 }
1618
1619                 if ( $user->idForName() == 0 ) {
1620                         $user->addToDatabase();
1621
1622                         try {
1623                                 $user->setPassword( $this->getVar( '_AdminPassword' ) );
1624                         } catch ( PasswordError $pwe ) {
1625                                 return Status::newFatal( 'config-admin-error-password', $name, $pwe->getMessage() );
1626                         }
1627
1628                         $user->addGroup( 'sysop' );
1629                         $user->addGroup( 'bureaucrat' );
1630                         if ( $this->getVar( '_AdminEmail' ) ) {
1631                                 $user->setEmail( $this->getVar( '_AdminEmail' ) );
1632                         }
1633                         $user->saveSettings();
1634
1635                         // Update user count
1636                         $ssUpdate = new SiteStatsUpdate( 0, 0, 0, 0, 1 );
1637                         $ssUpdate->doUpdate();
1638                 }
1639                 $status = Status::newGood();
1640
1641                 if ( $this->getVar( '_Subscribe' ) && $this->getVar( '_AdminEmail' ) ) {
1642                         $this->subscribeToMediaWikiAnnounce( $status );
1643                 }
1644
1645                 return $status;
1646         }
1647
1648         /**
1649          * @param $s Status
1650          */
1651         private function subscribeToMediaWikiAnnounce( Status $s ) {
1652                 $params = array(
1653                         'email' => $this->getVar( '_AdminEmail' ),
1654                         'language' => 'en',
1655                         'digest' => 0
1656                 );
1657
1658                 // Mailman doesn't support as many languages as we do, so check to make
1659                 // sure their selected language is available
1660                 $myLang = $this->getVar( '_UserLang' );
1661                 if ( in_array( $myLang, $this->mediaWikiAnnounceLanguages ) ) {
1662                         $myLang = $myLang == 'pt-br' ? 'pt_BR' : $myLang; // rewrite to Mailman's pt_BR
1663                         $params['language'] = $myLang;
1664                 }
1665
1666                 if ( MWHttpRequest::canMakeRequests() ) {
1667                         $res = MWHttpRequest::factory( $this->mediaWikiAnnounceUrl,
1668                                 array( 'method' => 'POST', 'postData' => $params ) )->execute();
1669                         if ( !$res->isOK() ) {
1670                                 $s->warning( 'config-install-subscribe-fail', $res->getMessage() );
1671                         }
1672                 } else {
1673                         $s->warning( 'config-install-subscribe-notpossible' );
1674                 }
1675         }
1676
1677         /**
1678          * Insert Main Page with default content.
1679          *
1680          * @param $installer DatabaseInstaller
1681          * @return Status
1682          */
1683         protected function createMainpage( DatabaseInstaller $installer ) {
1684                 $status = Status::newGood();
1685                 try {
1686                         $page = WikiPage::factory( Title::newMainPage() );
1687                         $content = new WikitextContent(
1688                                 wfMessage( 'mainpagetext' )->inContentLanguage()->text() . "\n\n" .
1689                                 wfMessage( 'mainpagedocfooter' )->inContentLanguage()->text()
1690                         );
1691
1692                         $page->doEditContent( $content,
1693                                 '',
1694                                 EDIT_NEW,
1695                                 false,
1696                                 User::newFromName( 'MediaWiki default' )
1697                         );
1698                 } catch ( MWException $e ) {
1699                         //using raw, because $wgShowExceptionDetails can not be set yet
1700                         $status->fatal( 'config-install-mainpage-failed', $e->getMessage() );
1701                 }
1702
1703                 return $status;
1704         }
1705
1706         /**
1707          * Override the necessary bits of the config to run an installation.
1708          */
1709         public static function overrideConfig() {
1710                 define( 'MW_NO_SESSION', 1 );
1711
1712                 // Don't access the database
1713                 $GLOBALS['wgUseDatabaseMessages'] = false;
1714                 // Don't cache langconv tables
1715                 $GLOBALS['wgLanguageConverterCacheType'] = CACHE_NONE;
1716                 // Debug-friendly
1717                 $GLOBALS['wgShowExceptionDetails'] = true;
1718                 // Don't break forms
1719                 $GLOBALS['wgExternalLinkTarget'] = '_blank';
1720
1721                 // Extended debugging
1722                 $GLOBALS['wgShowSQLErrors'] = true;
1723                 $GLOBALS['wgShowDBErrorBacktrace'] = true;
1724
1725                 // Allow multiple ob_flush() calls
1726                 $GLOBALS['wgDisableOutputCompression'] = true;
1727
1728                 // Use a sensible cookie prefix (not my_wiki)
1729                 $GLOBALS['wgCookiePrefix'] = 'mw_installer';
1730
1731                 // Some of the environment checks make shell requests, remove limits
1732                 $GLOBALS['wgMaxShellMemory'] = 0;
1733         }
1734
1735         /**
1736          * Add an installation step following the given step.
1737          *
1738          * @param array $callback A valid installation callback array, in this form:
1739          *    array( 'name' => 'some-unique-name', 'callback' => array( $obj, 'function' ) );
1740          * @param string $findStep the step to find. Omit to put the step at the beginning
1741          */
1742         public function addInstallStep( $callback, $findStep = 'BEGINNING' ) {
1743                 $this->extraInstallSteps[$findStep][] = $callback;
1744         }
1745
1746         /**
1747          * Disable the time limit for execution.
1748          * Some long-running pages (Install, Upgrade) will want to do this
1749          */
1750         protected function disableTimeLimit() {
1751                 wfSuppressWarnings();
1752                 set_time_limit( 0 );
1753                 wfRestoreWarnings();
1754         }
1755 }