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 = 'https://lists.wikimedia.org/mailman/subscribe/mediawiki-announce';
 306
 307         /**
 308          * Supported language codes for Mailman
 309          */
 310         protected $mediaWikiAnnounceLanguages = array(
 311                 'ca', 'cs', 'da', 'de', 'en', 'es', 'et', 'eu', 'fi', 'fr', 'hr', 'hu',
 312                 'it', 'ja', 'ko', 'lt', 'nl', 'no', 'pl', 'pt', 'pt-br', 'ro', 'ru',
 313                 'sl', 'sr', 'sv', 'tr', 'uk'
 314         );
 315
 316         /**
 317          * UI interface for displaying a short message
 318          * The parameters are like parameters to wfMessage().
 319          * The messages will be in wikitext format, which will be converted to an
 320          * output format such as HTML or text before being sent to the user.
 321          * @param $msg
 322          */
 323         abstract public function showMessage( $msg /*, ... */ );
 324
 325         /**
 326          * Same as showMessage(), but for displaying errors
 327          * @param $msg
 328          */
 329         abstract public function showError( $msg /*, ... */ );
 330
 331         /**
 332          * Show a message to the installing user by using a Status object
 333          * @param $status Status
 334          */
 335         abstract public function showStatusMessage( Status $status );
 336
 337         /**
 338          * Constructor, always call this from child classes.
 339          */
 340         public function __construct() {
 341                 global $wgExtensionMessagesFiles, $wgUser;
 342
 343                 // Disable the i18n cache and LoadBalancer
 344                 Language::getLocalisationCache()->disableBackend();
 345                 LBFactory::disableBackend();
 346
 347                 // Load the installer's i18n file.
 348                 $wgExtensionMessagesFiles['MediawikiInstaller'] =
 349                         __DIR__ . '/Installer.i18n.php';
 350
 351                 // Having a user with id = 0 safeguards us from DB access via User::loadOptions().
 352                 $wgUser = User::newFromId( 0 );
 353
 354                 $this->settings = $this->internalDefaults;
 355
 356                 foreach ( $this->defaultVarNames as $var ) {
 357                         $this->settings[$var] = $GLOBALS[$var];
 358                 }
 359
 360                 $compiledDBs = array();
 361                 foreach ( self::getDBTypes() as $type ) {
 362                         $installer = $this->getDBInstaller( $type );
 363
 364                         if ( !$installer->isCompiled() ) {
 365                                 continue;
 366                         }
 367                         $compiledDBs[] = $type;
 368
 369                         $defaults = $installer->getGlobalDefaults();
 370
 371                         foreach ( $installer->getGlobalNames() as $var ) {
 372                                 if ( isset( $defaults[$var] ) ) {
 373                                         $this->settings[$var] = $defaults[$var];
 374                                 } else {
 375                                         $this->settings[$var] = $GLOBALS[$var];
 376                                 }
 377                         }
 378                 }
 379                 $this->compiledDBs = $compiledDBs;
 380
 381                 $this->parserTitle = Title::newFromText( 'Installer' );
 382                 $this->parserOptions = new ParserOptions; // language will  be wrong :(
 383                 $this->parserOptions->setEditSection( false );
 384         }
 385
 386         /**
 387          * Get a list of known DB types.
 388          *
 389          * @return array
 390          */
 391         public static function getDBTypes() {
 392                 return self::$dbTypes;
 393         }
 394
 395         /**
 396          * Do initial checks of the PHP environment. Set variables according to
 397          * the observed environment.
 398          *
 399          * It's possible that this may be called under the CLI SAPI, not the SAPI
 400          * that the wiki will primarily run under. In that case, the subclass should
 401          * initialise variables such as wgScriptPath, before calling this function.
 402          *
 403          * Under the web subclass, it can already be assumed that PHP 5+ is in use
 404          * and that sessions are working.
 405          *
 406          * @return Status
 407          */
 408         public function doEnvironmentChecks() {
 409                 $phpVersion = phpversion();
 410                 if ( version_compare( $phpVersion, self::MINIMUM_PHP_VERSION, '>=' ) ) {
 411                         $this->showMessage( 'config-env-php', $phpVersion );
 412                         $good = true;
 413                 } else {
 414                         $this->showMessage( 'config-env-php-toolow', $phpVersion, self::MINIMUM_PHP_VERSION );
 415                         $good = false;
 416                 }
 417
 418                 if ( $good ) {
 419                         foreach ( $this->envChecks as $check ) {
 420                                 $status = $this->$check();
 421                                 if ( $status === false ) {
 422                                         $good = false;
 423                                 }
 424                         }
 425                 }
 426
 427                 $this->setVar( '_Environment', $good );
 428
 429                 return $good ? Status::newGood() : Status::newFatal( 'config-env-bad' );
 430         }
 431
 432         /**
 433          * Set a MW configuration variable, or internal installer configuration variable.
 434          *
 435          * @param $name String
 436          * @param $value Mixed
 437          */
 438         public function setVar( $name, $value ) {
 439                 $this->settings[$name] = $value;
 440         }
 441
 442         /**
 443          * Get an MW configuration variable, or internal installer configuration variable.
 444          * The defaults come from $GLOBALS (ultimately DefaultSettings.php).
 445          * Installer variables are typically prefixed by an underscore.
 446          *
 447          * @param $name String
 448          * @param $default Mixed
 449          *
 450          * @return mixed
 451          */
 452         public function getVar( $name, $default = null ) {
 453                 if ( !isset( $this->settings[$name] ) ) {
 454                         return $default;
 455                 } else {
 456                         return $this->settings[$name];
 457                 }
 458         }
 459
 460         /**
 461          * Get a list of DBs supported by current PHP setup
 462          *
 463          * @return array
 464          */
 465         public function getCompiledDBs() {
 466                 return $this->compiledDBs;
 467         }
 468
 469         /**
 470          * Get an instance of DatabaseInstaller for the specified DB type.
 471          *
 472          * @param $type Mixed: DB installer for which is needed, false to use default.
 473          *
 474          * @return DatabaseInstaller
 475          */
 476         public function getDBInstaller( $type = false ) {
 477                 if ( !$type ) {
 478                         $type = $this->getVar( 'wgDBtype' );
 479                 }
 480
 481                 $type = strtolower( $type );
 482
 483                 if ( !isset( $this->dbInstallers[$type] ) ) {
 484                         $class = ucfirst( $type ) . 'Installer';
 485                         $this->dbInstallers[$type] = new $class( $this );
 486                 }
 487
 488                 return $this->dbInstallers[$type];
 489         }
 490
 491         /**
 492          * Determine if LocalSettings.php exists. If it does, return its variables,
 493          * merged with those from AdminSettings.php, as an array.
 494          *
 495          * @return Array
 496          */
 497         public static function getExistingLocalSettings() {
 498                 global $IP;
 499
 500                 wfSuppressWarnings();
 501                 $_lsExists = file_exists( "$IP/LocalSettings.php" );
 502                 wfRestoreWarnings();
 503
 504                 if ( !$_lsExists ) {
 505                         return false;
 506                 }
 507                 unset( $_lsExists );
 508
 509                 require "$IP/includes/DefaultSettings.php";
 510                 require "$IP/LocalSettings.php";
 511                 if ( file_exists( "$IP/AdminSettings.php" ) ) {
 512                         require "$IP/AdminSettings.php";
 513                 }
 514
 515                 return get_defined_vars();
 516         }
 517
 518         /**
 519          * Get a fake password for sending back to the user in HTML.
 520          * This is a security mechanism to avoid compromise of the password in the
 521          * event of session ID compromise.
 522          *
 523          * @param $realPassword String
 524          *
 525          * @return string
 526          */
 527         public function getFakePassword( $realPassword ) {
 528                 return str_repeat( '*', strlen( $realPassword ) );
 529         }
 530
 531         /**
 532          * Set a variable which stores a password, except if the new value is a
 533          * fake password in which case leave it as it is.
 534          *
 535          * @param $name String
 536          * @param $value Mixed
 537          */
 538         public function setPassword( $name, $value ) {
 539                 if ( !preg_match( '/^\*+$/', $value ) ) {
 540                         $this->setVar( $name, $value );
 541                 }
 542         }
 543
 544         /**
 545          * On POSIX systems return the primary group of the webserver we're running under.
 546          * On other systems just returns null.
 547          *
 548          * This is used to advice the user that he should chgrp his mw-config/data/images directory as the
 549          * webserver user before he can install.
 550          *
 551          * Public because SqliteInstaller needs it, and doesn't subclass Installer.
 552          *
 553          * @return mixed
 554          */
 555         public static function maybeGetWebserverPrimaryGroup() {
 556                 if ( !function_exists( 'posix_getegid' ) || !function_exists( 'posix_getpwuid' ) ) {
 557                         # I don't know this, this isn't UNIX.
 558                         return null;
 559                 }
 560
 561                 # posix_getegid() *not* getmygid() because we want the group of the webserver,
 562                 # not whoever owns the current script.
 563                 $gid = posix_getegid();
 564                 $getpwuid = posix_getpwuid( $gid );
 565                 $group = $getpwuid['name'];
 566
 567                 return $group;
 568         }
 569
 570         /**
 571          * Convert wikitext $text to HTML.
 572          *
 573          * This is potentially error prone since many parser features require a complete
 574          * installed MW database. The solution is to just not use those features when you
 575          * write your messages. This appears to work well enough. Basic formatting and
 576          * external links work just fine.
 577          *
 578          * But in case a translator decides to throw in a "#ifexist" or internal link or
 579          * whatever, this function is guarded to catch the attempted DB access and to present
 580          * some fallback text.
 581          *
 582          * @param $text String
 583          * @param $lineStart Boolean
 584          * @return String
 585          */
 586         public function parse( $text, $lineStart = false ) {
 587                 global $wgParser;
 588
 589                 try {
 590                         $out = $wgParser->parse( $text, $this->parserTitle, $this->parserOptions, $lineStart );
 591                         $html = $out->getText();
 592                 } catch ( DBAccessError $e ) {
 593                         $html = '<!--DB access attempted during parse-->  ' . htmlspecialchars( $text );
 594
 595                         if ( !empty( $this->debug ) ) {
 596                                 $html .= "<!--\n" . $e->getTraceAsString() . "\n-->";
 597                         }
 598                 }
 599
 600                 return $html;
 601         }
 602
 603         /**
 604          * @return ParserOptions
 605          */
 606         public function getParserOptions() {
 607                 return $this->parserOptions;
 608         }
 609
 610         public function disableLinkPopups() {
 611                 $this->parserOptions->setExternalLinkTarget( false );
 612         }
 613
 614         public function restoreLinkPopups() {
 615                 global $wgExternalLinkTarget;
 616                 $this->parserOptions->setExternalLinkTarget( $wgExternalLinkTarget );
 617         }
 618
 619         /**
 620          * Install step which adds a row to the site_stats table with appropriate
 621          * initial values.
 622          *
 623          * @param $installer DatabaseInstaller
 624          *
 625          * @return Status
 626          */
 627         public function populateSiteStats( DatabaseInstaller $installer ) {
 628                 $status = $installer->getConnection();
 629                 if ( !$status->isOK() ) {
 630                         return $status;
 631                 }
 632                 $status->value->insert( 'site_stats', array(
 633                         'ss_row_id' => 1,
 634                         'ss_total_views' => 0,
 635                         'ss_total_edits' => 0,
 636                         'ss_good_articles' => 0,
 637                         'ss_total_pages' => 0,
 638                         'ss_users' => 0,
 639                         'ss_images' => 0 ),
 640                         __METHOD__, 'IGNORE' );
 641
 642                 return Status::newGood();
 643         }
 644
 645         /**
 646          * Exports all wg* variables stored by the installer into global scope.
 647          */
 648         public function exportVars() {
 649                 foreach ( $this->settings as $name => $value ) {
 650                         if ( substr( $name, 0, 2 ) == 'wg' ) {
 651                                 $GLOBALS[$name] = $value;
 652                         }
 653                 }
 654         }
 655
 656         /**
 657          * Environment check for DB types.
 658          * @return bool
 659          */
 660         protected function envCheckDB() {
 661                 global $wgLang;
 662
 663                 $allNames = array();
 664
 665                 // Messages: config-type-mysql, config-type-postgres, config-type-oracle,
 666                 // config-type-sqlite
 667                 foreach ( self::getDBTypes() as $name ) {
 668                         $allNames[] = wfMessage( "config-type-$name" )->text();
 669                 }
 670
 671                 $databases = $this->getCompiledDBs();
 672
 673                 $databases = array_flip( $databases );
 674                 foreach ( array_keys( $databases ) as $db ) {
 675                         $installer = $this->getDBInstaller( $db );
 676                         $status = $installer->checkPrerequisites();
 677                         if ( !$status->isGood() ) {
 678                                 $this->showStatusMessage( $status );
 679                         }
 680                         if ( !$status->isOK() ) {
 681                                 unset( $databases[$db] );
 682                         }
 683                 }
 684                 $databases = array_flip( $databases );
 685                 if ( !$databases ) {
 686                         $this->showError( 'config-no-db', $wgLang->commaList( $allNames ) );
 687
 688                         // @todo FIXME: This only works for the web installer!
 689                         return false;
 690                 }
 691
 692                 return true;
 693         }
 694
 695         /**
 696          * Environment check for register_globals.
 697          */
 698         protected function envCheckRegisterGlobals() {
 699                 if ( wfIniGetBool( 'register_globals' ) ) {
 700                         $this->showMessage( 'config-register-globals' );
 701                 }
 702         }
 703
 704         /**
 705          * Some versions of libxml+PHP break < and > encoding horribly
 706          * @return bool
 707          */
 708         protected function envCheckBrokenXML() {
 709                 $test = new PhpXmlBugTester();
 710                 if ( !$test->ok ) {
 711                         $this->showError( 'config-brokenlibxml' );
 712
 713                         return false;
 714                 }
 715
 716                 return true;
 717         }
 718
 719         /**
 720          * Test PHP (probably 5.3.1, but it could regress again) to make sure that
 721          * reference parameters to __call() are not converted to null
 722          * @return bool
 723          */
 724         protected function envCheckPHP531() {
 725                 $test = new PhpRefCallBugTester;
 726                 $test->execute();
 727                 if ( !$test->ok ) {
 728                         $this->showError( 'config-using531', phpversion() );
 729
 730                         return false;
 731                 }
 732
 733                 return true;
 734         }
 735
 736         /**
 737          * Environment check for magic_quotes_runtime.
 738          * @return bool
 739          */
 740         protected function envCheckMagicQuotes() {
 741                 if ( wfIniGetBool( "magic_quotes_runtime" ) ) {
 742                         $this->showError( 'config-magic-quotes-runtime' );
 743
 744                         return false;
 745                 }
 746
 747                 return true;
 748         }
 749
 750         /**
 751          * Environment check for magic_quotes_sybase.
 752          * @return bool
 753          */
 754         protected function envCheckMagicSybase() {
 755                 if ( wfIniGetBool( 'magic_quotes_sybase' ) ) {
 756                         $this->showError( 'config-magic-quotes-sybase' );
 757
 758                         return false;
 759                 }
 760
 761                 return true;
 762         }
 763
 764         /**
 765          * Environment check for mbstring.func_overload.
 766          * @return bool
 767          */
 768         protected function envCheckMbstring() {
 769                 if ( wfIniGetBool( 'mbstring.func_overload' ) ) {
 770                         $this->showError( 'config-mbstring' );
 771
 772                         return false;
 773                 }
 774
 775                 return true;
 776         }
 777
 778         /**
 779          * Environment check for zend.ze1_compatibility_mode.
 780          * @return bool
 781          */
 782         protected function envCheckZE1() {
 783                 if ( wfIniGetBool( 'zend.ze1_compatibility_mode' ) ) {
 784                         $this->showError( 'config-ze1' );
 785
 786                         return false;
 787                 }
 788
 789                 return true;
 790         }
 791
 792         /**
 793          * Environment check for safe_mode.
 794          * @return bool
 795          */
 796         protected function envCheckSafeMode() {
 797                 if ( wfIniGetBool( 'safe_mode' ) ) {
 798                         $this->setVar( '_SafeMode', true );
 799                         $this->showMessage( 'config-safe-mode' );
 800                 }
 801
 802                 return true;
 803         }
 804
 805         /**
 806          * Environment check for the XML module.
 807          * @return bool
 808          */
 809         protected function envCheckXML() {
 810                 if ( !function_exists( "utf8_encode" ) ) {
 811                         $this->showError( 'config-xml-bad' );
 812
 813                         return false;
 814                 }
 815
 816                 return true;
 817         }
 818
 819         /**
 820          * Environment check for the PCRE module.
 821          *
 822          * @note If this check were to fail, the parser would
 823          *   probably throw an exception before the result
 824          *   of this check is shown to the user.
 825          * @return bool
 826          */
 827         protected function envCheckPCRE() {
 828                 if ( !function_exists( 'preg_match' ) ) {
 829                         $this->showError( 'config-pcre' );
 830
 831                         return false;
 832                 }
 833                 wfSuppressWarnings();
 834                 $regexd = preg_replace( '/[\x{0430}-\x{04FF}]/iu', '', '-АБВГД-' );
 835                 // Need to check for \p support too, as PCRE can be compiled
 836                 // with utf8 support, but not unicode property support.
 837                 // check that \p{Zs} (space separators) matches
 838                 // U+3000 (Ideographic space)
 839                 $regexprop = preg_replace( '/\p{Zs}/u', '', "-\xE3\x80\x80-" );
 840                 wfRestoreWarnings();
 841                 if ( $regexd != '--' || $regexprop != '--' ) {
 842                         $this->showError( 'config-pcre-no-utf8' );
 843
 844                         return false;
 845                 }
 846
 847                 return true;
 848         }
 849
 850         /**
 851          * Environment check for available memory.
 852          * @return bool
 853          */
 854         protected function envCheckMemory() {
 855                 $limit = ini_get( 'memory_limit' );
 856
 857                 if ( !$limit || $limit == -1 ) {
 858                         return true;
 859                 }
 860
 861                 $n = wfShorthandToInteger( $limit );
 862
 863                 if ( $n < $this->minMemorySize * 1024 * 1024 ) {
 864                         $newLimit = "{$this->minMemorySize}M";
 865
 866                         if ( ini_set( "memory_limit", $newLimit ) === false ) {
 867                                 $this->showMessage( 'config-memory-bad', $limit );
 868                         } else {
 869                                 $this->showMessage( 'config-memory-raised', $limit, $newLimit );
 870                                 $this->setVar( '_RaiseMemory', true );
 871                         }
 872                 }
 873
 874                 return true;
 875         }
 876
 877         /**
 878          * Environment check for compiled object cache types.
 879          */
 880         protected function envCheckCache() {
 881                 $caches = array();
 882                 foreach ( $this->objectCaches as $name => $function ) {
 883                         if ( function_exists( $function ) ) {
 884                                 if ( $name == 'xcache' && !wfIniGetBool( 'xcache.var_size' ) ) {
 885                                         continue;
 886                                 }
 887                                 $caches[$name] = true;
 888                         }
 889                 }
 890
 891                 if ( !$caches ) {
 892                         $this->showMessage( 'config-no-cache' );
 893                 }
 894
 895                 $this->setVar( '_Caches', $caches );
 896         }
 897
 898         /**
 899          * Scare user to death if they have mod_security
 900          * @return bool
 901          */
 902         protected function envCheckModSecurity() {
 903                 if ( self::apacheModulePresent( 'mod_security' ) ) {
 904                         $this->showMessage( 'config-mod-security' );
 905                 }
 906
 907                 return true;
 908         }
 909
 910         /**
 911          * Search for GNU diff3.
 912          * @return bool
 913          */
 914         protected function envCheckDiff3() {
 915                 $names = array( "gdiff3", "diff3", "diff3.exe" );
 916                 $versionInfo = array( '$1 --version 2>&1', 'GNU diffutils' );
 917
 918                 $diff3 = self::locateExecutableInDefaultPaths( $names, $versionInfo );
 919
 920                 if ( $diff3 ) {
 921                         $this->setVar( 'wgDiff3', $diff3 );
 922                 } else {
 923                         $this->setVar( 'wgDiff3', false );
 924                         $this->showMessage( 'config-diff3-bad' );
 925                 }
 926
 927                 return true;
 928         }
 929
 930         /**
 931          * Environment check for ImageMagick and GD.
 932          * @return bool
 933          */
 934         protected function envCheckGraphics() {
 935                 $names = array( wfIsWindows() ? 'convert.exe' : 'convert' );
 936                 $versionInfo = array( '$1 -version', 'ImageMagick' );
 937                 $convert = self::locateExecutableInDefaultPaths( $names, $versionInfo );
 938
 939                 $this->setVar( 'wgImageMagickConvertCommand', '' );
 940                 if ( $convert ) {
 941                         $this->setVar( 'wgImageMagickConvertCommand', $convert );
 942                         $this->showMessage( 'config-imagemagick', $convert );
 943
 944                         return true;
 945                 } elseif ( function_exists( 'imagejpeg' ) ) {
 946                         $this->showMessage( 'config-gd' );
 947                 } else {
 948                         $this->showMessage( 'config-no-scaling' );
 949                 }
 950
 951                 return true;
 952         }
 953
 954         /**
 955          * Search for git.
 956          *
 957          * @since 1.22
 958          * @return bool
 959          */
 960         protected function envCheckGit() {
 961                 $names = array( wfIsWindows() ? 'git.exe' : 'git' );
 962                 $versionInfo = array( '$1 --version', 'git version' );
 963
 964                 $git = self::locateExecutableInDefaultPaths( $names, $versionInfo );
 965
 966                 if ( $git ) {
 967                         $this->setVar( 'wgGitBin', $git );
 968                         $this->showMessage( 'config-git', $git );
 969                 } else {
 970                         $this->setVar( 'wgGitBin', false );
 971                         $this->showMessage( 'config-git-bad' );
 972                 }
 973
 974                 return true;
 975         }
 976
 977         /**
 978          * Environment check for the server hostname.
 979          */
 980         protected function envCheckServer() {
 981                 $server = $this->envGetDefaultServer();
 982                 if ( $server !== null ) {
 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 }