includes/installer/Installer.php

   1 <?php
   2 /**
   3  * Base code for MediaWiki installer.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  * http://www.gnu.org/copyleft/gpl.html
  19  *
  20  * @file
  21  * @ingroup Deployment
  22  */
  23
  24 /**
  25  * This documentation group collects source code files with deployment functionality.
  26  *
  27  * @defgroup Deployment Deployment
  28  */
  29
  30 /**
  31  * Base installer class.
  32  *
  33  * This class provides the base for installation and update functionality
  34  * for both MediaWiki core and extensions.
  35  *
  36  * @ingroup Deployment
  37  * @since 1.17
  38  */
  39 abstract class Installer {
  40
  41         // This is the absolute minimum PHP version we can support
  42         const MINIMUM_PHP_VERSION = '5.3.2';
  43
  44         /**
  45          * @var array
  46          */
  47         protected $settings;
  48
  49         /**
  50          * Cached DB installer instances, access using getDBInstaller().
  51          *
  52          * @var array
  53          */
  54         protected $dbInstallers = array();
  55
  56         /**
  57          * Minimum memory size in MB.
  58          *
  59          * @var integer
  60          */
  61         protected $minMemorySize = 50;
  62
  63         /**
  64          * Cached Title, used by parse().
  65          *
  66          * @var Title
  67          */
  68         protected $parserTitle;
  69
  70         /**
  71          * Cached ParserOptions, used by parse().
  72          *
  73          * @var ParserOptions
  74          */
  75         protected $parserOptions;
  76
  77         /**
  78          * Known database types. These correspond to the class names <type>Installer,
  79          * and are also MediaWiki database types valid for $wgDBtype.
  80          *
  81          * To add a new type, create a <type>Installer class and a Database<type>
  82          * class, and add a config-type-<type> message to MessagesEn.php.
  83          *
  84          * @var array
  85          */
  86         protected static $dbTypes = array(
  87                 'mysql',
  88                 'postgres',
  89                 'oracle',
  90                 'sqlite',
  91         );
  92
  93         /**
  94          * A list of environment check methods called by doEnvironmentChecks().
  95          * These may output warnings using showMessage(), and/or abort the
  96          * installation process by returning false.
  97          *
  98          * @var array
  99          */
 100         protected $envChecks = array(
 101                 'envCheckDB',
 102                 'envCheckRegisterGlobals',
 103                 'envCheckBrokenXML',
 104                 'envCheckPHP531',
 105                 'envCheckMagicQuotes',
 106                 'envCheckMagicSybase',
 107                 'envCheckMbstring',
 108                 'envCheckZE1',
 109                 'envCheckSafeMode',
 110                 'envCheckXML',
 111                 'envCheckPCRE',
 112                 'envCheckMemory',
 113                 'envCheckCache',
 114                 'envCheckModSecurity',
 115                 'envCheckDiff3',
 116                 'envCheckGraphics',
 117                 'envCheckGit',
 118                 'envCheckServer',
 119                 'envCheckPath',
 120                 'envCheckExtension',
 121                 'envCheckShellLocale',
 122                 'envCheckUploadsDirectory',
 123                 'envCheckLibicu',
 124                 'envCheckSuhosinMaxValueLength',
 125                 'envCheckCtype',
 126         );
 127
 128         /**
 129          * MediaWiki configuration globals that will eventually be passed through
 130          * to LocalSettings.php. The names only are given here, the defaults
 131          * typically come from DefaultSettings.php.
 132          *
 133          * @var array
 134          */
 135         protected $defaultVarNames = array(
 136                 'wgSitename',
 137                 'wgPasswordSender',
 138                 'wgLanguageCode',
 139                 'wgRightsIcon',
 140                 'wgRightsText',
 141                 'wgRightsUrl',
 142                 'wgMainCacheType',
 143                 'wgEnableEmail',
 144                 'wgEnableUserEmail',
 145                 'wgEnotifUserTalk',
 146                 'wgEnotifWatchlist',
 147                 'wgEmailAuthentication',
 148                 'wgDBtype',
 149                 'wgDiff3',
 150                 'wgImageMagickConvertCommand',
 151                 'wgGitBin',
 152                 'IP',
 153                 'wgServer',
 154                 'wgScriptPath',
 155                 'wgScriptExtension',
 156                 'wgMetaNamespace',
 157                 'wgDeletedDirectory',
 158                 'wgEnableUploads',
 159                 'wgLogo',
 160                 'wgShellLocale',
 161                 'wgSecretKey',
 162                 'wgUseInstantCommons',
 163                 'wgUpgradeKey',
 164                 'wgDefaultSkin',
 165                 'wgResourceLoaderMaxQueryLength',
 166         );
 167
 168         /**
 169          * Variables that are stored alongside globals, and are used for any
 170          * configuration of the installation process aside from the MediaWiki
 171          * configuration. Map of names to defaults.
 172          *
 173          * @var array
 174          */
 175         protected $internalDefaults = array(
 176                 '_UserLang' => 'en',
 177                 '_Environment' => false,
 178                 '_CompiledDBs' => array(),
 179                 '_SafeMode' => false,
 180                 '_RaiseMemory' => false,
 181                 '_UpgradeDone' => false,
 182                 '_InstallDone' => false,
 183                 '_Caches' => array(),
 184                 '_InstallPassword' => '',
 185                 '_SameAccount' => true,
 186                 '_CreateDBAccount' => false,
 187                 '_NamespaceType' => 'site-name',
 188                 '_AdminName' => '', // will be set later, when the user selects language
 189                 '_AdminPassword' => '',
 190                 '_AdminPassword2' => '',
 191                 '_AdminEmail' => '',
 192                 '_Subscribe' => false,
 193                 '_SkipOptional' => 'continue',
 194                 '_RightsProfile' => 'wiki',
 195                 '_LicenseCode' => 'none',
 196                 '_CCDone' => false,
 197                 '_Extensions' => array(),
 198                 '_MemCachedServers' => '',
 199                 '_UpgradeKeySupplied' => false,
 200                 '_ExistingDBSettings' => false,
 201         );
 202
 203         /**
 204          * The actual list of installation steps. This will be initialized by getInstallSteps()
 205          *
 206          * @var array
 207          */
 208         private $installSteps = array();
 209
 210         /**
 211          * Extra steps for installation, for things like DatabaseInstallers to modify
 212          *
 213          * @var array
 214          */
 215         protected $extraInstallSteps = array();
 216
 217         /**
 218          * Known object cache types and the functions used to test for their existence.
 219          *
 220          * @var array
 221          */
 222         protected $objectCaches = array(
 223                 'xcache' => 'xcache_get',
 224                 'apc' => 'apc_fetch',
 225                 'wincache' => 'wincache_ucache_get'
 226         );
 227
 228         /**
 229          * User rights profiles.
 230          *
 231          * @var array
 232          */
 233         public $rightsProfiles = array(
 234                 'wiki' => array(),
 235                 'no-anon' => array(
 236                         '*' => array( 'edit' => false )
 237                 ),
 238                 'fishbowl' => array(
 239                         '*' => array(
 240                                 'createaccount' => false,
 241                                 'edit' => false,
 242                         ),
 243                 ),
 244                 'private' => array(
 245                         '*' => array(
 246                                 'createaccount' => false,
 247                                 'edit' => false,
 248                                 'read' => false,
 249                         ),
 250                 ),
 251         );
 252
 253         /**
 254          * License types.
 255          *
 256          * @var array
 257          */
 258         public $licenses = array(
 259                 'cc-by' => array(
 260                         'url' => 'http://creativecommons.org/licenses/by/3.0/',
 261                         'icon' => '{$wgStylePath}/common/images/cc-by.png',
 262                 ),
 263                 'cc-by-sa' => array(
 264                         'url' => 'http://creativecommons.org/licenses/by-sa/3.0/',
 265                         'icon' => '{$wgStylePath}/common/images/cc-by-sa.png',
 266                 ),
 267                 'cc-by-nc-sa' => array(
 268                         'url' => 'http://creativecommons.org/licenses/by-nc-sa/3.0/',
 269                         'icon' => '{$wgStylePath}/common/images/cc-by-nc-sa.png',
 270                 ),
 271                 'cc-0' => array(
 272                         'url' => 'https://creativecommons.org/publicdomain/zero/1.0/',
 273                         'icon' => '{$wgStylePath}/common/images/cc-0.png',
 274                 ),
 275                 'pd' => array(
 276                         'url' => '',
 277                         'icon' => '{$wgStylePath}/common/images/public-domain.png',
 278                 ),
 279                 'gfdl' => array(
 280                         'url' => 'http://www.gnu.org/copyleft/fdl.html',
 281                         'icon' => '{$wgStylePath}/common/images/gnu-fdl.png',
 282                 ),
 283                 'none' => array(
 284                         'url' => '',
 285                         'icon' => '',
 286                         'text' => ''
 287                 ),
 288                 'cc-choose' => array(
 289                         // Details will be filled in by the selector.
 290                         'url' => '',
 291                         'icon' => '',
 292                         'text' => '',
 293                 ),
 294         );
 295
 296         /**
 297          * URL to mediawiki-announce subscription
 298          */
 299         protected $mediaWikiAnnounceUrl = 'https://lists.wikimedia.org/mailman/subscribe/mediawiki-announce';
 300
 301         /**
 302          * Supported language codes for Mailman
 303          */
 304         protected $mediaWikiAnnounceLanguages = array(
 305                 'ca', 'cs', 'da', 'de', 'en', 'es', 'et', 'eu', 'fi', 'fr', 'hr', 'hu',
 306                 'it', 'ja', 'ko', 'lt', 'nl', 'no', 'pl', 'pt', 'pt-br', 'ro', 'ru',
 307                 'sl', 'sr', 'sv', 'tr', 'uk'
 308         );
 309
 310         /**
 311          * UI interface for displaying a short message
 312          * The parameters are like parameters to wfMessage().
 313          * The messages will be in wikitext format, which will be converted to an
 314          * output format such as HTML or text before being sent to the user.
 315          * @param $msg
 316          */
 317         abstract public function showMessage( $msg /*, ... */ );
 318
 319         /**
 320          * Same as showMessage(), but for displaying errors
 321          * @param $msg
 322          */
 323         abstract public function showError( $msg /*, ... */ );
 324
 325         /**
 326          * Show a message to the installing user by using a Status object
 327          * @param $status Status
 328          */
 329         abstract public function showStatusMessage( Status $status );
 330
 331         /**
 332          * Constructor, always call this from child classes.
 333          */
 334         public function __construct() {
 335                 global $wgExtensionMessagesFiles, $wgUser;
 336
 337                 // Disable the i18n cache and LoadBalancer
 338                 Language::getLocalisationCache()->disableBackend();
 339                 LBFactory::disableBackend();
 340
 341                 // Load the installer's i18n file.
 342                 $wgExtensionMessagesFiles['MediawikiInstaller'] =
 343                         __DIR__ . '/Installer.i18n.php';
 344
 345                 // Having a user with id = 0 safeguards us from DB access via User::loadOptions().
 346                 $wgUser = User::newFromId( 0 );
 347
 348                 $this->settings = $this->internalDefaults;
 349
 350                 foreach ( $this->defaultVarNames as $var ) {
 351                         $this->settings[$var] = $GLOBALS[$var];
 352                 }
 353
 354                 $compiledDBs = array();
 355                 foreach ( self::getDBTypes() as $type ) {
 356                         $installer = $this->getDBInstaller( $type );
 357
 358                         if ( !$installer->isCompiled() ) {
 359                                 continue;
 360                         }
 361                         $compiledDBs[] = $type;
 362
 363                         $defaults = $installer->getGlobalDefaults();
 364
 365                         foreach ( $installer->getGlobalNames() as $var ) {
 366                                 if ( isset( $defaults[$var] ) ) {
 367                                         $this->settings[$var] = $defaults[$var];
 368                                 } else {
 369                                         $this->settings[$var] = $GLOBALS[$var];
 370                                 }
 371                         }
 372                 }
 373                 $this->setVar( '_CompiledDBs', $compiledDBs );
 374
 375                 $this->parserTitle = Title::newFromText( 'Installer' );
 376                 $this->parserOptions = new ParserOptions; // language will  be wrong :(
 377                 $this->parserOptions->setEditSection( false );
 378         }
 379
 380         /**
 381          * Get a list of known DB types.
 382          *
 383          * @return array
 384          */
 385         public static function getDBTypes() {
 386                 return self::$dbTypes;
 387         }
 388
 389         /**
 390          * Do initial checks of the PHP environment. Set variables according to
 391          * the observed environment.
 392          *
 393          * It's possible that this may be called under the CLI SAPI, not the SAPI
 394          * that the wiki will primarily run under. In that case, the subclass should
 395          * initialise variables such as wgScriptPath, before calling this function.
 396          *
 397          * Under the web subclass, it can already be assumed that PHP 5+ is in use
 398          * and that sessions are working.
 399          *
 400          * @return Status
 401          */
 402         public function doEnvironmentChecks() {
 403                 $phpVersion = phpversion();
 404                 if ( version_compare( $phpVersion, self::MINIMUM_PHP_VERSION, '>=' ) ) {
 405                         $this->showMessage( 'config-env-php', $phpVersion );
 406                         $good = true;
 407                 } else {
 408                         $this->showMessage( 'config-env-php-toolow', $phpVersion, self::MINIMUM_PHP_VERSION );
 409                         $good = false;
 410                 }
 411
 412                 if ( $good ) {
 413                         foreach ( $this->envChecks as $check ) {
 414                                 $status = $this->$check();
 415                                 if ( $status === false ) {
 416                                         $good = false;
 417                                 }
 418                         }
 419                 }
 420
 421                 $this->setVar( '_Environment', $good );
 422
 423                 return $good ? Status::newGood() : Status::newFatal( 'config-env-bad' );
 424         }
 425
 426         /**
 427          * Set a MW configuration variable, or internal installer configuration variable.
 428          *
 429          * @param $name String
 430          * @param $value Mixed
 431          */
 432         public function setVar( $name, $value ) {
 433                 $this->settings[$name] = $value;
 434         }
 435
 436         /**
 437          * Get an MW configuration variable, or internal installer configuration variable.
 438          * The defaults come from $GLOBALS (ultimately DefaultSettings.php).
 439          * Installer variables are typically prefixed by an underscore.
 440          *
 441          * @param $name String
 442          * @param $default Mixed
 443          *
 444          * @return mixed
 445          */
 446         public function getVar( $name, $default = null ) {
 447                 if ( !isset( $this->settings[$name] ) ) {
 448                         return $default;
 449                 } else {
 450                         return $this->settings[$name];
 451                 }
 452         }
 453
 454         /**
 455          * Get an instance of DatabaseInstaller for the specified DB type.
 456          *
 457          * @param $type Mixed: DB installer for which is needed, false to use default.
 458          *
 459          * @return DatabaseInstaller
 460          */
 461         public function getDBInstaller( $type = false ) {
 462                 if ( !$type ) {
 463                         $type = $this->getVar( 'wgDBtype' );
 464                 }
 465
 466                 $type = strtolower( $type );
 467
 468                 if ( !isset( $this->dbInstallers[$type] ) ) {
 469                         $class = ucfirst( $type ) . 'Installer';
 470                         $this->dbInstallers[$type] = new $class( $this );
 471                 }
 472
 473                 return $this->dbInstallers[$type];
 474         }
 475
 476         /**
 477          * Determine if LocalSettings.php exists. If it does, return its variables,
 478          * merged with those from AdminSettings.php, as an array.
 479          *
 480          * @return Array
 481          */
 482         public static function getExistingLocalSettings() {
 483                 global $IP;
 484
 485                 wfSuppressWarnings();
 486                 $_lsExists = file_exists( "$IP/LocalSettings.php" );
 487                 wfRestoreWarnings();
 488
 489                 if ( !$_lsExists ) {
 490                         return false;
 491                 }
 492                 unset( $_lsExists );
 493
 494                 require( "$IP/includes/DefaultSettings.php" );
 495                 require( "$IP/LocalSettings.php" );
 496                 if ( file_exists( "$IP/AdminSettings.php" ) ) {
 497                         require( "$IP/AdminSettings.php" );
 498                 }
 499                 return get_defined_vars();
 500         }
 501
 502         /**
 503          * Get a fake password for sending back to the user in HTML.
 504          * This is a security mechanism to avoid compromise of the password in the
 505          * event of session ID compromise.
 506          *
 507          * @param $realPassword String
 508          *
 509          * @return string
 510          */
 511         public function getFakePassword( $realPassword ) {
 512                 return str_repeat( '*', strlen( $realPassword ) );
 513         }
 514
 515         /**
 516          * Set a variable which stores a password, except if the new value is a
 517          * fake password in which case leave it as it is.
 518          *
 519          * @param $name String
 520          * @param $value Mixed
 521          */
 522         public function setPassword( $name, $value ) {
 523                 if ( !preg_match( '/^\*+$/', $value ) ) {
 524                         $this->setVar( $name, $value );
 525                 }
 526         }
 527
 528         /**
 529          * On POSIX systems return the primary group of the webserver we're running under.
 530          * On other systems just returns null.
 531          *
 532          * This is used to advice the user that he should chgrp his mw-config/data/images directory as the
 533          * webserver user before he can install.
 534          *
 535          * Public because SqliteInstaller needs it, and doesn't subclass Installer.
 536          *
 537          * @return mixed
 538          */
 539         public static function maybeGetWebserverPrimaryGroup() {
 540                 if ( !function_exists( 'posix_getegid' ) || !function_exists( 'posix_getpwuid' ) ) {
 541                         # I don't know this, this isn't UNIX.
 542                         return null;
 543                 }
 544
 545                 # posix_getegid() *not* getmygid() because we want the group of the webserver,
 546                 # not whoever owns the current script.
 547                 $gid = posix_getegid();
 548                 $getpwuid = posix_getpwuid( $gid );
 549                 $group = $getpwuid['name'];
 550
 551                 return $group;
 552         }
 553
 554         /**
 555          * Convert wikitext $text to HTML.
 556          *
 557          * This is potentially error prone since many parser features require a complete
 558          * installed MW database. The solution is to just not use those features when you
 559          * write your messages. This appears to work well enough. Basic formatting and
 560          * external links work just fine.
 561          *
 562          * But in case a translator decides to throw in a "#ifexist" or internal link or
 563          * whatever, this function is guarded to catch the attempted DB access and to present
 564          * some fallback text.
 565          *
 566          * @param $text String
 567          * @param $lineStart Boolean
 568          * @return String
 569          */
 570         public function parse( $text, $lineStart = false ) {
 571                 global $wgParser;
 572
 573                 try {
 574                         $out = $wgParser->parse( $text, $this->parserTitle, $this->parserOptions, $lineStart );
 575                         $html = $out->getText();
 576                 } catch ( DBAccessError $e ) {
 577                         $html = '<!--DB access attempted during parse-->  ' . htmlspecialchars( $text );
 578
 579                         if ( !empty( $this->debug ) ) {
 580                                 $html .= "<!--\n" . $e->getTraceAsString() . "\n-->";
 581                         }
 582                 }
 583
 584                 return $html;
 585         }
 586
 587         /**
 588          * @return ParserOptions
 589          */
 590         public function getParserOptions() {
 591                 return $this->parserOptions;
 592         }
 593
 594         public function disableLinkPopups() {
 595                 $this->parserOptions->setExternalLinkTarget( false );
 596         }
 597
 598         public function restoreLinkPopups() {
 599                 global $wgExternalLinkTarget;
 600                 $this->parserOptions->setExternalLinkTarget( $wgExternalLinkTarget );
 601         }
 602
 603         /**
 604          * Install step which adds a row to the site_stats table with appropriate
 605          * initial values.
 606          *
 607          * @param $installer DatabaseInstaller
 608          *
 609          * @return Status
 610          */
 611         public function populateSiteStats( DatabaseInstaller $installer ) {
 612                 $status = $installer->getConnection();
 613                 if ( !$status->isOK() ) {
 614                         return $status;
 615                 }
 616                 $status->value->insert( 'site_stats', array(
 617                         'ss_row_id' => 1,
 618                         'ss_total_views' => 0,
 619                         'ss_total_edits' => 0,
 620                         'ss_good_articles' => 0,
 621                         'ss_total_pages' => 0,
 622                         'ss_users' => 0,
 623                         'ss_images' => 0 ),
 624                         __METHOD__, 'IGNORE' );
 625                 return Status::newGood();
 626         }
 627
 628         /**
 629          * Exports all wg* variables stored by the installer into global scope.
 630          */
 631         public function exportVars() {
 632                 foreach ( $this->settings as $name => $value ) {
 633                         if ( substr( $name, 0, 2 ) == 'wg' ) {
 634                                 $GLOBALS[$name] = $value;
 635                         }
 636                 }
 637         }
 638
 639         /**
 640          * Environment check for DB types.
 641          * @return bool
 642          */
 643         protected function envCheckDB() {
 644                 global $wgLang;
 645
 646                 $allNames = array();
 647
 648                 // Give grep a chance to find the usages:
 649                 // config-type-mysql, config-type-postgres, config-type-oracle, config-type-sqlite
 650                 foreach ( self::getDBTypes() as $name ) {
 651                         $allNames[] = wfMessage( "config-type-$name" )->text();
 652                 }
 653
 654                 // cache initially available databases to make sure that everything will be displayed correctly
 655                 // after a refresh on env checks page
 656                 $databases = $this->getVar( '_CompiledDBs-preFilter' );
 657                 if ( !$databases ) {
 658                         $databases = $this->getVar( '_CompiledDBs' );
 659                         $this->setVar( '_CompiledDBs-preFilter', $databases );
 660                 }
 661
 662                 $databases = array_flip ( $databases );
 663                 foreach ( array_keys( $databases ) as $db ) {
 664                         $installer = $this->getDBInstaller( $db );
 665                         $status = $installer->checkPrerequisites();
 666                         if ( !$status->isGood() ) {
 667                                 $this->showStatusMessage( $status );
 668                         }
 669                         if ( !$status->isOK() ) {
 670                                 unset( $databases[$db] );
 671                         }
 672                 }
 673                 $databases = array_flip( $databases );
 674                 if ( !$databases ) {
 675                         $this->showError( 'config-no-db', $wgLang->commaList( $allNames ) );
 676                         // @todo FIXME: This only works for the web installer!
 677                         return false;
 678                 }
 679                 $this->setVar( '_CompiledDBs', $databases );
 680                 return true;
 681         }
 682
 683         /**
 684          * Environment check for register_globals.
 685          */
 686         protected function envCheckRegisterGlobals() {
 687                 if ( wfIniGetBool( 'register_globals' ) ) {
 688                         $this->showMessage( 'config-register-globals' );
 689                 }
 690         }
 691
 692         /**
 693          * Some versions of libxml+PHP break < and > encoding horribly
 694          * @return bool
 695          */
 696         protected function envCheckBrokenXML() {
 697                 $test = new PhpXmlBugTester();
 698                 if ( !$test->ok ) {
 699                         $this->showError( 'config-brokenlibxml' );
 700                         return false;
 701                 }
 702                 return true;
 703         }
 704
 705         /**
 706          * Test PHP (probably 5.3.1, but it could regress again) to make sure that
 707          * reference parameters to __call() are not converted to null
 708          * @return bool
 709          */
 710         protected function envCheckPHP531() {
 711                 $test = new PhpRefCallBugTester;
 712                 $test->execute();
 713                 if ( !$test->ok ) {
 714                         $this->showError( 'config-using531', phpversion() );
 715                         return false;
 716                 }
 717                 return true;
 718         }
 719
 720         /**
 721          * Environment check for magic_quotes_runtime.
 722          * @return bool
 723          */
 724         protected function envCheckMagicQuotes() {
 725                 if ( wfIniGetBool( "magic_quotes_runtime" ) ) {
 726                         $this->showError( 'config-magic-quotes-runtime' );
 727                         return false;
 728                 }
 729                 return true;
 730         }
 731
 732         /**
 733          * Environment check for magic_quotes_sybase.
 734          * @return bool
 735          */
 736         protected function envCheckMagicSybase() {
 737                 if ( wfIniGetBool( 'magic_quotes_sybase' ) ) {
 738                         $this->showError( 'config-magic-quotes-sybase' );
 739                         return false;
 740                 }
 741                 return true;
 742         }
 743
 744         /**
 745          * Environment check for mbstring.func_overload.
 746          * @return bool
 747          */
 748         protected function envCheckMbstring() {
 749                 if ( wfIniGetBool( 'mbstring.func_overload' ) ) {
 750                         $this->showError( 'config-mbstring' );
 751                         return false;
 752                 }
 753                 return true;
 754         }
 755
 756         /**
 757          * Environment check for zend.ze1_compatibility_mode.
 758          * @return bool
 759          */
 760         protected function envCheckZE1() {
 761                 if ( wfIniGetBool( 'zend.ze1_compatibility_mode' ) ) {
 762                         $this->showError( 'config-ze1' );
 763                         return false;
 764                 }
 765                 return true;
 766         }
 767
 768         /**
 769          * Environment check for safe_mode.
 770          * @return bool
 771          */
 772         protected function envCheckSafeMode() {
 773                 if ( wfIniGetBool( 'safe_mode' ) ) {
 774                         $this->setVar( '_SafeMode', true );
 775                         $this->showMessage( 'config-safe-mode' );
 776                 }
 777                 return true;
 778         }
 779
 780         /**
 781          * Environment check for the XML module.
 782          * @return bool
 783          */
 784         protected function envCheckXML() {
 785                 if ( !function_exists( "utf8_encode" ) ) {
 786                         $this->showError( 'config-xml-bad' );
 787                         return false;
 788                 }
 789                 return true;
 790         }
 791
 792         /**
 793          * Environment check for the PCRE module.
 794          *
 795          * @note If this check were to fail, the parser would
 796          *   probably throw an exception before the result
 797          *   of this check is shown to the user.
 798          * @return bool
 799          */
 800         protected function envCheckPCRE() {
 801                 if ( !function_exists( 'preg_match' ) ) {
 802                         $this->showError( 'config-pcre' );
 803                         return false;
 804                 }
 805                 wfSuppressWarnings();
 806                 $regexd = preg_replace( '/[\x{0430}-\x{04FF}]/iu', '', '-АБВГД-' );
 807                 // Need to check for \p support too, as PCRE can be compiled
 808                 // with utf8 support, but not unicode property support.
 809                 // check that \p{Zs} (space separators) matches
 810                 // U+3000 (Ideographic space)
 811                 $regexprop = preg_replace( '/\p{Zs}/u', '', "-\xE3\x80\x80-" );
 812                 wfRestoreWarnings();
 813                 if ( $regexd != '--' || $regexprop != '--' ) {
 814                         $this->showError( 'config-pcre-no-utf8' );
 815                         return false;
 816                 }
 817                 return true;
 818         }
 819
 820         /**
 821          * Environment check for available memory.
 822          * @return bool
 823          */
 824         protected function envCheckMemory() {
 825                 $limit = ini_get( 'memory_limit' );
 826
 827                 if ( !$limit || $limit == -1 ) {
 828                         return true;
 829                 }
 830
 831                 $n = wfShorthandToInteger( $limit );
 832
 833                 if ( $n < $this->minMemorySize * 1024 * 1024 ) {
 834                         $newLimit = "{$this->minMemorySize}M";
 835
 836                         if ( ini_set( "memory_limit", $newLimit ) === false ) {
 837                                 $this->showMessage( 'config-memory-bad', $limit );
 838                         } else {
 839                                 $this->showMessage( 'config-memory-raised', $limit, $newLimit );
 840                                 $this->setVar( '_RaiseMemory', true );
 841                         }
 842                 }
 843                 return true;
 844         }
 845
 846         /**
 847          * Environment check for compiled object cache types.
 848          */
 849         protected function envCheckCache() {
 850                 $caches = array();
 851                 foreach ( $this->objectCaches as $name => $function ) {
 852                         if ( function_exists( $function ) ) {
 853                                 if ( $name == 'xcache' && !wfIniGetBool( 'xcache.var_size' ) ) {
 854                                         continue;
 855                                 }
 856                                 $caches[$name] = true;
 857                         }
 858                 }
 859
 860                 if ( !$caches ) {
 861                         $this->showMessage( 'config-no-cache' );
 862                 }
 863
 864                 $this->setVar( '_Caches', $caches );
 865         }
 866
 867         /**
 868          * Scare user to death if they have mod_security
 869          * @return bool
 870          */
 871         protected function envCheckModSecurity() {
 872                 if ( self::apacheModulePresent( 'mod_security' ) ) {
 873                         $this->showMessage( 'config-mod-security' );
 874                 }
 875                 return true;
 876         }
 877
 878         /**
 879          * Search for GNU diff3.
 880          * @return bool
 881          */
 882         protected function envCheckDiff3() {
 883                 $names = array( "gdiff3", "diff3", "diff3.exe" );
 884                 $versionInfo = array( '$1 --version 2>&1', 'GNU diffutils' );
 885
 886                 $diff3 = self::locateExecutableInDefaultPaths( $names, $versionInfo );
 887
 888                 if ( $diff3 ) {
 889                         $this->setVar( 'wgDiff3', $diff3 );
 890                 } else {
 891                         $this->setVar( 'wgDiff3', false );
 892                         $this->showMessage( 'config-diff3-bad' );
 893                 }
 894                 return true;
 895         }
 896
 897         /**
 898          * Environment check for ImageMagick and GD.
 899          * @return bool
 900          */
 901         protected function envCheckGraphics() {
 902                 $names = array( wfIsWindows() ? 'convert.exe' : 'convert' );
 903                 $versionInfo = array( '$1 -version', 'ImageMagick' );
 904                 $convert = self::locateExecutableInDefaultPaths( $names, $versionInfo );
 905
 906                 $this->setVar( 'wgImageMagickConvertCommand', '' );
 907                 if ( $convert ) {
 908                         $this->setVar( 'wgImageMagickConvertCommand', $convert );
 909                         $this->showMessage( 'config-imagemagick', $convert );
 910                         return true;
 911                 } elseif ( function_exists( 'imagejpeg' ) ) {
 912                         $this->showMessage( 'config-gd' );
 913
 914                 } else {
 915                         $this->showMessage( 'config-no-scaling' );
 916                 }
 917                 return true;
 918         }
 919
 920         /**
 921          * Search for git.
 922          *
 923          * @since 1.22
 924          * @return bool
 925          */
 926         protected function envCheckGit() {
 927                 $names = array( wfIsWindows() ? 'git.exe' : 'git' );
 928                 $versionInfo = array( '$1 --version', 'git version' );
 929
 930                 $git = self::locateExecutableInDefaultPaths( $names, $versionInfo );
 931
 932                 if ( $git ) {
 933                         $this->setVar( 'wgGitBin', $git );
 934                         $this->showMessage( 'config-git', $git );
 935                 } else {
 936                         $this->setVar( 'wgGitBin', false );
 937                         $this->showMessage( 'config-git-bad' );
 938                 }
 939                 return true;
 940         }
 941
 942         /**
 943          * Environment check for the server hostname.
 944          */
 945         protected function envCheckServer() {
 946                 $server = $this->envGetDefaultServer();
 947                 $this->showMessage( 'config-using-server', $server );
 948                 $this->setVar( 'wgServer', $server );
 949                 return true;
 950         }
 951
 952         /**
 953          * Helper function to be called from envCheckServer()
 954          * @return String
 955          */
 956         abstract protected function envGetDefaultServer();
 957
 958         /**
 959          * Environment check for setting $IP and $wgScriptPath.
 960          * @return bool
 961          */
 962         protected function envCheckPath() {
 963                 global $IP;
 964                 $IP = dirname( dirname( __DIR__ ) );
 965                 $this->setVar( 'IP', $IP );
 966
 967                 $this->showMessage( 'config-using-uri', $this->getVar( 'wgServer' ), $this->getVar( 'wgScriptPath' ) );
 968                 return true;
 969         }
 970
 971         /**
 972          * Environment check for setting the preferred PHP file extension.
 973          * @return bool
 974          */
 975         protected function envCheckExtension() {
 976                 // @todo FIXME: Detect this properly
 977                 if ( defined( 'MW_INSTALL_PHP5_EXT' ) ) {
 978                         $ext = 'php5';
 979                 } else {
 980                         $ext = 'php';
 981                 }
 982                 $this->setVar( 'wgScriptExtension', ".$ext" );
 983                 return true;
 984         }
 985
 986         /**
 987          * Environment check for preferred locale in shell
 988          * @return bool
 989          */
 990         protected function envCheckShellLocale() {
 991                 $os = php_uname( 's' );
 992                 $supported = array( 'Linux', 'SunOS', 'HP-UX', 'Darwin' ); # Tested these
 993
 994                 if ( !in_array( $os, $supported ) ) {
 995                         return true;
 996                 }
 997
 998                 # Get a list of available locales.
 999                 $ret = false;
1000                 $lines = wfShellExec( '/usr/bin/locale -a', $ret );
1001
1002                 if ( $ret ) {
1003                         return true;
1004                 }
1005
1006                 $lines = array_map( 'trim', explode( "\n", $lines ) );
1007                 $candidatesByLocale = array();
1008                 $candidatesByLang = array();
1009
1010                 foreach ( $lines as $line ) {
1011                         if ( $line === '' ) {
1012                                 continue;
1013                         }
1014
1015                         if ( !preg_match( '/^([a-zA-Z]+)(_[a-zA-Z]+|)\.(utf8|UTF-8)(@[a-zA-Z_]*|)$/i', $line, $m ) ) {
1016                                 continue;
1017                         }
1018
1019                         list( , $lang, , , ) = $m;
1020
1021                         $candidatesByLocale[$m[0]] = $m;
1022                         $candidatesByLang[$lang][] = $m;
1023                 }
1024
1025                 # Try the current value of LANG.
1026                 if ( isset( $candidatesByLocale[getenv( 'LANG' )] ) ) {
1027                         $this->setVar( 'wgShellLocale', getenv( 'LANG' ) );
1028                         return true;
1029                 }
1030
1031                 # Try the most common ones.
1032                 $commonLocales = array( 'en_US.UTF-8', 'en_US.utf8', 'de_DE.UTF-8', 'de_DE.utf8' );
1033                 foreach ( $commonLocales as $commonLocale ) {
1034                         if ( isset( $candidatesByLocale[$commonLocale] ) ) {
1035                                 $this->setVar( 'wgShellLocale', $commonLocale );
1036                                 return true;
1037                         }
1038                 }
1039
1040                 # Is there an available locale in the Wiki's language?
1041                 $wikiLang = $this->getVar( 'wgLanguageCode' );
1042
1043                 if ( isset( $candidatesByLang[$wikiLang] ) ) {
1044                         $m = reset( $candidatesByLang[$wikiLang] );
1045                         $this->setVar( 'wgShellLocale', $m[0] );
1046                         return true;
1047                 }
1048
1049                 # Are there any at all?
1050                 if ( count( $candidatesByLocale ) ) {
1051                         $m = reset( $candidatesByLocale );
1052                         $this->setVar( 'wgShellLocale', $m[0] );
1053                         return true;
1054                 }
1055
1056                 # Give up.
1057                 return true;
1058         }
1059
1060         /**
1061          * Environment check for the permissions of the uploads directory
1062          * @return bool
1063          */
1064         protected function envCheckUploadsDirectory() {
1065                 global $IP;
1066
1067                 $dir = $IP . '/images/';
1068                 $url = $this->getVar( 'wgServer' ) . $this->getVar( 'wgScriptPath' ) . '/images/';
1069                 $safe = !$this->dirIsExecutable( $dir, $url );
1070
1071                 if ( !$safe ) {
1072                         $this->showMessage( 'config-uploads-not-safe', $dir );
1073                 }
1074                 return true;
1075         }
1076
1077         /**
1078          * Checks if suhosin.get.max_value_length is set, and if so, sets
1079          * $wgResourceLoaderMaxQueryLength to that value in the generated
1080          * LocalSettings file
1081          * @return bool
1082          */
1083         protected function envCheckSuhosinMaxValueLength() {
1084                 $maxValueLength = ini_get( 'suhosin.get.max_value_length' );
1085                 if ( $maxValueLength > 0 ) {
1086                         if ( $maxValueLength < 1024 ) {
1087                                 # Only warn if the value is below the sane 1024
1088                                 $this->showMessage( 'config-suhosin-max-value-length', $maxValueLength );
1089                         }
1090                 } else {
1091                         $maxValueLength = -1;
1092                 }
1093                 $this->setVar( 'wgResourceLoaderMaxQueryLength', $maxValueLength );
1094                 return true;
1095         }
1096
1097         /**
1098          * Convert a hex string representing a Unicode code point to that code point.
1099          * @param $c String
1100          * @return string
1101          */
1102         protected function unicodeChar( $c ) {
1103                 $c = hexdec( $c );
1104                 if ( $c <= 0x7F ) {
1105                         return chr( $c );
1106                 } elseif ( $c <= 0x7FF ) {
1107                         return chr( 0xC0 | $c >> 6 ) . chr( 0x80 | $c & 0x3F );
1108                 } elseif ( $c <= 0xFFFF ) {
1109                         return chr( 0xE0 | $c >> 12 ) . chr( 0x80 | $c >> 6 & 0x3F )
1110                                 . chr( 0x80 | $c & 0x3F );
1111                 } elseif ( $c <= 0x10FFFF ) {
1112                         return chr( 0xF0 | $c >> 18 ) . chr( 0x80 | $c >> 12 & 0x3F )
1113                                 . chr( 0x80 | $c >> 6 & 0x3F )
1114                                 . chr( 0x80 | $c & 0x3F );
1115                 } else {
1116                         return false;
1117                 }
1118         }
1119
1120         /**
1121          * Check the libicu version
1122          */
1123         protected function envCheckLibicu() {
1124                 $utf8 = function_exists( 'utf8_normalize' );
1125                 $intl = function_exists( 'normalizer_normalize' );
1126
1127                 /**
1128                  * This needs to be updated something that the latest libicu
1129                  * will properly normalize.  This normalization was found at
1130                  * http://www.unicode.org/versions/Unicode5.2.0/#Character_Additions
1131                  * Note that we use the hex representation to create the code
1132                  * points in order to avoid any Unicode-destroying during transit.
1133                  */
1134                 $not_normal_c = $this->unicodeChar( "FA6C" );
1135                 $normal_c = $this->unicodeChar( "242EE" );
1136
1137                 $useNormalizer = 'php';
1138                 $needsUpdate = false;
1139
1140                 /**
1141                  * We're going to prefer the pecl extension here unless
1142                  * utf8_normalize is more up to date.
1143                  */
1144                 if ( $utf8 ) {
1145                         $useNormalizer = 'utf8';
1146                         $utf8 = utf8_normalize( $not_normal_c, UtfNormal::UNORM_NFC );
1147                         if ( $utf8 !== $normal_c ) {
1148                                 $needsUpdate = true;
1149                         }
1150                 }
1151                 if ( $intl ) {
1152                         $useNormalizer = 'intl';
1153                         $intl = normalizer_normalize( $not_normal_c, Normalizer::FORM_C );
1154                         if ( $intl !== $normal_c ) {
1155                                 $needsUpdate = true;
1156                         }
1157                 }
1158
1159                 // Uses messages 'config-unicode-using-php', 'config-unicode-using-utf8', 'config-unicode-using-intl'
1160                 if ( $useNormalizer === 'php' ) {
1161                         $this->showMessage( 'config-unicode-pure-php-warning' );
1162                 } else {
1163                         $this->showMessage( 'config-unicode-using-' . $useNormalizer );
1164                         if ( $needsUpdate ) {
1165                                 $this->showMessage( 'config-unicode-update-warning' );
1166                         }
1167                 }
1168         }
1169
1170         /**
1171          * @return bool
1172          */
1173         protected function envCheckCtype() {
1174                 if ( !function_exists( 'ctype_digit' ) ) {
1175                         $this->showError( 'config-ctype' );
1176                         return false;
1177                 }
1178                 return true;
1179         }
1180
1181         /**
1182          * Get an array of likely places we can find executables. Check a bunch
1183          * of known Unix-like defaults, as well as the PATH environment variable
1184          * (which should maybe make it work for Windows?)
1185          *
1186          * @return Array
1187          */
1188         protected static function getPossibleBinPaths() {
1189                 return array_merge(
1190                         array( '/usr/bin', '/usr/local/bin', '/opt/csw/bin',
1191                                 '/usr/gnu/bin', '/usr/sfw/bin', '/sw/bin', '/opt/local/bin' ),
1192                         explode( PATH_SEPARATOR, getenv( 'PATH' ) )
1193                 );
1194         }
1195
1196         /**
1197          * Search a path for any of the given executable names. Returns the
1198          * executable name if found. Also checks the version string returned
1199          * by each executable.
1200          *
1201          * Used only by environment checks.
1202          *
1203          * @param string $path path to search
1204          * @param array $names of executable names
1205          * @param $versionInfo Boolean false or array with two members:
1206          *               0 => Command to run for version check, with $1 for the full executable name
1207          *               1 => String to compare the output with
1208          *
1209          * If $versionInfo is not false, only executables with a version
1210          * matching $versionInfo[1] will be returned.
1211          * @return bool|string
1212          */
1213         public static function locateExecutable( $path, $names, $versionInfo = false ) {
1214                 if ( !is_array( $names ) ) {
1215                         $names = array( $names );
1216                 }
1217
1218                 foreach ( $names as $name ) {
1219                         $command = $path . DIRECTORY_SEPARATOR . $name;
1220
1221                         wfSuppressWarnings();
1222                         $file_exists = file_exists( $command );
1223                         wfRestoreWarnings();
1224
1225                         if ( $file_exists ) {
1226                                 if ( !$versionInfo ) {
1227                                         return $command;
1228                                 }
1229
1230                                 $file = str_replace( '$1', wfEscapeShellArg( $command ), $versionInfo[0] );
1231                                 if ( strstr( wfShellExec( $file ), $versionInfo[1] ) !== false ) {
1232                                         return $command;
1233                                 }
1234                         }
1235                 }
1236                 return false;
1237         }
1238
1239         /**
1240          * Same as locateExecutable(), but checks in getPossibleBinPaths() by default
1241          * @see locateExecutable()
1242          * @param $names
1243          * @param $versionInfo bool
1244          * @return bool|string
1245          */
1246         public static function locateExecutableInDefaultPaths( $names, $versionInfo = false ) {
1247                 foreach ( self::getPossibleBinPaths() as $path ) {
1248                         $exe = self::locateExecutable( $path, $names, $versionInfo );
1249                         if ( $exe !== false ) {
1250                                 return $exe;
1251                         }
1252                 }
1253                 return false;
1254         }
1255
1256         /**
1257          * Checks if scripts located in the given directory can be executed via the given URL.
1258          *
1259          * Used only by environment checks.
1260          * @param $dir string
1261          * @param $url string
1262          * @return bool|int|string
1263          */
1264         public function dirIsExecutable( $dir, $url ) {
1265                 $scriptTypes = array(
1266                         'php' => array(
1267                                 "<?php echo 'ex' . 'ec';",
1268                                 "#!/var/env php5\n<?php echo 'ex' . 'ec';",
1269                         ),
1270                 );
1271
1272                 // it would be good to check other popular languages here, but it'll be slow.
1273
1274                 wfSuppressWarnings();
1275
1276                 foreach ( $scriptTypes as $ext => $contents ) {
1277                         foreach ( $contents as $source ) {
1278                                 $file = 'exectest.' . $ext;
1279
1280                                 if ( !file_put_contents( $dir . $file, $source ) ) {
1281                                         break;
1282                                 }
1283
1284                                 try {
1285                                         $text = Http::get( $url . $file, array( 'timeout' => 3 ) );
1286                                 }
1287                                 catch ( MWException $e ) {
1288                                         // Http::get throws with allow_url_fopen = false and no curl extension.
1289                                         $text = null;
1290                                 }
1291                                 unlink( $dir . $file );
1292
1293                                 if ( $text == 'exec' ) {
1294                                         wfRestoreWarnings();
1295                                         return $ext;
1296                                 }
1297                         }
1298                 }
1299
1300                 wfRestoreWarnings();
1301
1302                 return false;
1303         }
1304
1305         /**
1306          * Checks for presence of an Apache module. Works only if PHP is running as an Apache module, too.
1307          *
1308          * @param string $moduleName Name of module to check.
1309          * @return bool
1310          */
1311         public static function apacheModulePresent( $moduleName ) {
1312                 if ( function_exists( 'apache_get_modules' ) && in_array( $moduleName, apache_get_modules() ) ) {
1313                         return true;
1314                 }
1315                 // try it the hard way
1316                 ob_start();
1317                 phpinfo( INFO_MODULES );
1318                 $info = ob_get_clean();
1319                 return strpos( $info, $moduleName ) !== false;
1320         }
1321
1322         /**
1323          * ParserOptions are constructed before we determined the language, so fix it
1324          *
1325          * @param $lang Language
1326          */
1327         public function setParserLanguage( $lang ) {
1328                 $this->parserOptions->setTargetLanguage( $lang );
1329                 $this->parserOptions->setUserLang( $lang );
1330         }
1331
1332         /**
1333          * Overridden by WebInstaller to provide lastPage parameters.
1334          * @param $page string
1335          * @return string
1336          */
1337         protected function getDocUrl( $page ) {
1338                 return "{$_SERVER['PHP_SELF']}?page=" . urlencode( $page );
1339         }
1340
1341         /**
1342          * Finds extensions that follow the format /extensions/Name/Name.php,
1343          * and returns an array containing the value for 'Name' for each found extension.
1344          *
1345          * @return array
1346          */
1347         public function findExtensions() {
1348                 if ( $this->getVar( 'IP' ) === null ) {
1349                         return array();
1350                 }
1351
1352                 $extDir = $this->getVar( 'IP' ) . '/extensions';
1353                 if ( !is_readable( $extDir ) || !is_dir( $extDir ) ) {
1354                         return array();
1355                 }
1356
1357                 $dh = opendir( $extDir );
1358                 $exts = array();
1359                 while ( ( $file = readdir( $dh ) ) !== false ) {
1360                         if ( !is_dir( "$extDir/$file" ) ) {
1361                                 continue;
1362                         }
1363                         if ( file_exists( "$extDir/$file/$file.php" ) ) {
1364                                 $exts[] = $file;
1365                         }
1366                 }
1367                 closedir( $dh );
1368                 natcasesort( $exts );
1369
1370                 return $exts;
1371         }
1372
1373         /**
1374          * Installs the auto-detected extensions.
1375          *
1376          * @return Status
1377          */
1378         protected function includeExtensions() {
1379                 global $IP;
1380                 $exts = $this->getVar( '_Extensions' );
1381                 $IP = $this->getVar( 'IP' );
1382
1383                 /**
1384                  * We need to include DefaultSettings before including extensions to avoid
1385                  * warnings about unset variables. However, the only thing we really
1386                  * want here is $wgHooks['LoadExtensionSchemaUpdates']. This won't work
1387                  * if the extension has hidden hook registration in $wgExtensionFunctions,
1388                  * but we're not opening that can of worms
1389                  * @see https://bugzilla.wikimedia.org/show_bug.cgi?id=26857
1390                  */
1391                 global $wgAutoloadClasses;
1392                 $wgAutoloadClasses = array();
1393
1394                 require( "$IP/includes/DefaultSettings.php" );
1395
1396                 foreach ( $exts as $e ) {
1397                         require_once( "$IP/extensions/$e/$e.php" );
1398                 }
1399
1400                 $hooksWeWant = isset( $wgHooks['LoadExtensionSchemaUpdates'] ) ?
1401                         $wgHooks['LoadExtensionSchemaUpdates'] : array();
1402
1403                 // Unset everyone else's hooks. Lord knows what someone might be doing
1404                 // in ParserFirstCallInit (see bug 27171)
1405                 $GLOBALS['wgHooks'] = array( 'LoadExtensionSchemaUpdates' => $hooksWeWant );
1406
1407                 return Status::newGood();
1408         }
1409
1410         /**
1411          * Get an array of install steps. Should always be in the format of
1412          * array(
1413          *   'name'     => 'someuniquename',
1414          *   'callback' => array( $obj, 'method' ),
1415          * )
1416          * There must be a config-install-$name message defined per step, which will
1417          * be shown on install.
1418          *
1419          * @param $installer DatabaseInstaller so we can make callbacks
1420          * @return array
1421          */
1422         protected function getInstallSteps( DatabaseInstaller $installer ) {
1423                 $coreInstallSteps = array(
1424                         array( 'name' => 'database',   'callback' => array( $installer, 'setupDatabase' ) ),
1425                         array( 'name' => 'tables',     'callback' => array( $installer, 'createTables' ) ),
1426                         array( 'name' => 'interwiki',  'callback' => array( $installer, 'populateInterwikiTable' ) ),
1427                         array( 'name' => 'stats',      'callback' => array( $this, 'populateSiteStats' ) ),
1428                         array( 'name' => 'keys',       'callback' => array( $this, 'generateKeys' ) ),
1429                         array( 'name' => 'sysop',      'callback' => array( $this, 'createSysop' ) ),
1430                         array( 'name' => 'mainpage',   'callback' => array( $this, 'createMainpage' ) ),
1431                 );
1432
1433                 // Build the array of install steps starting from the core install list,
1434                 // then adding any callbacks that wanted to attach after a given step
1435                 foreach ( $coreInstallSteps as $step ) {
1436                         $this->installSteps[] = $step;
1437                         if ( isset( $this->extraInstallSteps[$step['name']] ) ) {
1438                                 $this->installSteps = array_merge(
1439                                         $this->installSteps,
1440                                         $this->extraInstallSteps[$step['name']]
1441                                 );
1442                         }
1443                 }
1444
1445                 // Prepend any steps that want to be at the beginning
1446                 if ( isset( $this->extraInstallSteps['BEGINNING'] ) ) {
1447                         $this->installSteps = array_merge(
1448                                 $this->extraInstallSteps['BEGINNING'],
1449                                 $this->installSteps
1450                         );
1451                 }
1452
1453                 // Extensions should always go first, chance to tie into hooks and such
1454                 if ( count( $this->getVar( '_Extensions' ) ) ) {
1455                         array_unshift( $this->installSteps,
1456                                 array( 'name' => 'extensions', 'callback' => array( $this, 'includeExtensions' ) )
1457                         );
1458                         $this->installSteps[] = array(
1459                                 'name' => 'extension-tables',
1460                                 'callback' => array( $installer, 'createExtensionTables' )
1461                         );
1462                 }
1463                 return $this->installSteps;
1464         }
1465
1466         /**
1467          * Actually perform the installation.
1468          *
1469          * @param array $startCB A callback array for the beginning of each step
1470          * @param array $endCB A callback array for the end of each step
1471          *
1472          * @return Array of Status objects
1473          */
1474         public function performInstallation( $startCB, $endCB ) {
1475                 $installResults = array();
1476                 $installer = $this->getDBInstaller();
1477                 $installer->preInstall();
1478                 $steps = $this->getInstallSteps( $installer );
1479                 foreach ( $steps as $stepObj ) {
1480                         $name = $stepObj['name'];
1481                         call_user_func_array( $startCB, array( $name ) );
1482
1483                         // Perform the callback step
1484                         $status = call_user_func( $stepObj['callback'], $installer );
1485
1486                         // Output and save the results
1487                         call_user_func( $endCB, $name, $status );
1488                         $installResults[$name] = $status;
1489
1490                         // If we've hit some sort of fatal, we need to bail.
1491                         // Callback already had a chance to do output above.
1492                         if ( !$status->isOk() ) {
1493                                 break;
1494                         }
1495                 }
1496                 if ( $status->isOk() ) {
1497                         $this->setVar( '_InstallDone', true );
1498                 }
1499                 return $installResults;
1500         }
1501
1502         /**
1503          * Generate $wgSecretKey. Will warn if we had to use an insecure random source.
1504          *
1505          * @return Status
1506          */
1507         public function generateKeys() {
1508                 $keys = array( 'wgSecretKey' => 64 );
1509                 if ( strval( $this->getVar( 'wgUpgradeKey' ) ) === '' ) {
1510                         $keys['wgUpgradeKey'] = 16;
1511                 }
1512                 return $this->doGenerateKeys( $keys );
1513         }
1514
1515         /**
1516          * Generate a secret value for variables using our CryptRand generator.
1517          * Produce a warning if the random source was insecure.
1518          *
1519          * @param $keys Array
1520          * @return Status
1521          */
1522         protected function doGenerateKeys( $keys ) {
1523                 $status = Status::newGood();
1524
1525                 $strong = true;
1526                 foreach ( $keys as $name => $length ) {
1527                         $secretKey = MWCryptRand::generateHex( $length, true );
1528                         if ( !MWCryptRand::wasStrong() ) {
1529                                 $strong = false;
1530                         }
1531
1532                         $this->setVar( $name, $secretKey );
1533                 }
1534
1535                 if ( !$strong ) {
1536                         $names = array_keys( $keys );
1537                         $names = preg_replace( '/^(.*)$/', '\$$1', $names );
1538                         global $wgLang;
1539                         $status->warning( 'config-insecure-keys', $wgLang->listToText( $names ), count( $names ) );
1540                 }
1541
1542                 return $status;
1543         }
1544
1545         /**
1546          * Create the first user account, grant it sysop and bureaucrat rights
1547          *
1548          * @return Status
1549          */
1550         protected function createSysop() {
1551                 $name = $this->getVar( '_AdminName' );
1552                 $user = User::newFromName( $name );
1553
1554                 if ( !$user ) {
1555                         // We should've validated this earlier anyway!
1556                         return Status::newFatal( 'config-admin-error-user', $name );
1557                 }
1558
1559                 if ( $user->idForName() == 0 ) {
1560                         $user->addToDatabase();
1561
1562                         try {
1563                                 $user->setPassword( $this->getVar( '_AdminPassword' ) );
1564                         } catch ( PasswordError $pwe ) {
1565                                 return Status::newFatal( 'config-admin-error-password', $name, $pwe->getMessage() );
1566                         }
1567
1568                         $user->addGroup( 'sysop' );
1569                         $user->addGroup( 'bureaucrat' );
1570                         if ( $this->getVar( '_AdminEmail' ) ) {
1571                                 $user->setEmail( $this->getVar( '_AdminEmail' ) );
1572                         }
1573                         $user->saveSettings();
1574
1575                         // Update user count
1576                         $ssUpdate = new SiteStatsUpdate( 0, 0, 0, 0, 1 );
1577                         $ssUpdate->doUpdate();
1578                 }
1579                 $status = Status::newGood();
1580
1581                 if ( $this->getVar( '_Subscribe' ) && $this->getVar( '_AdminEmail' ) ) {
1582                         $this->subscribeToMediaWikiAnnounce( $status );
1583                 }
1584
1585                 return $status;
1586         }
1587
1588         /**
1589          * @param $s Status
1590          */
1591         private function subscribeToMediaWikiAnnounce( Status $s ) {
1592                 $params = array(
1593                         'email' => $this->getVar( '_AdminEmail' ),
1594                         'language' => 'en',
1595                         'digest' => 0
1596                 );
1597
1598                 // Mailman doesn't support as many languages as we do, so check to make
1599                 // sure their selected language is available
1600                 $myLang = $this->getVar( '_UserLang' );
1601                 if ( in_array( $myLang, $this->mediaWikiAnnounceLanguages ) ) {
1602                         $myLang = $myLang == 'pt-br' ? 'pt_BR' : $myLang; // rewrite to Mailman's pt_BR
1603                         $params['language'] = $myLang;
1604                 }
1605
1606                 if ( MWHttpRequest::canMakeRequests() ) {
1607                         $res = MWHttpRequest::factory( $this->mediaWikiAnnounceUrl,
1608                                 array( 'method' => 'POST', 'postData' => $params ) )->execute();
1609                         if ( !$res->isOK() ) {
1610                                 $s->warning( 'config-install-subscribe-fail', $res->getMessage() );
1611                         }
1612                 } else {
1613                         $s->warning( 'config-install-subscribe-notpossible' );
1614                 }
1615         }
1616
1617         /**
1618          * Insert Main Page with default content.
1619          *
1620          * @param $installer DatabaseInstaller
1621          * @return Status
1622          */
1623         protected function createMainpage( DatabaseInstaller $installer ) {
1624                 $status = Status::newGood();
1625                 try {
1626                         $page = WikiPage::factory( Title::newMainPage() );
1627                         $content = new WikitextContent(
1628                                 wfMessage( 'mainpagetext' )->inContentLanguage()->text() . "\n\n" .
1629                                 wfMessage( 'mainpagedocfooter' )->inContentLanguage()->text()
1630                         );
1631
1632                         $page->doEditContent( $content,
1633                                         '',
1634                                         EDIT_NEW,
1635                                         false,
1636                                         User::newFromName( 'MediaWiki default' ) );
1637                 } catch ( MWException $e ) {
1638                         //using raw, because $wgShowExceptionDetails can not be set yet
1639                         $status->fatal( 'config-install-mainpage-failed', $e->getMessage() );
1640                 }
1641
1642                 return $status;
1643         }
1644
1645         /**
1646          * Override the necessary bits of the config to run an installation.
1647          */
1648         public static function overrideConfig() {
1649                 define( 'MW_NO_SESSION', 1 );
1650
1651                 // Don't access the database
1652                 $GLOBALS['wgUseDatabaseMessages'] = false;
1653                 // Don't cache langconv tables
1654                 $GLOBALS['wgLanguageConverterCacheType'] = CACHE_NONE;
1655                 // Debug-friendly
1656                 $GLOBALS['wgShowExceptionDetails'] = true;
1657                 // Don't break forms
1658                 $GLOBALS['wgExternalLinkTarget'] = '_blank';
1659
1660                 // Extended debugging
1661                 $GLOBALS['wgShowSQLErrors'] = true;
1662                 $GLOBALS['wgShowDBErrorBacktrace'] = true;
1663
1664                 // Allow multiple ob_flush() calls
1665                 $GLOBALS['wgDisableOutputCompression'] = true;
1666
1667                 // Use a sensible cookie prefix (not my_wiki)
1668                 $GLOBALS['wgCookiePrefix'] = 'mw_installer';
1669
1670                 // Some of the environment checks make shell requests, remove limits
1671                 $GLOBALS['wgMaxShellMemory'] = 0;
1672         }
1673
1674         /**
1675          * Add an installation step following the given step.
1676          *
1677          * @param array $callback A valid installation callback array, in this form:
1678          *    array( 'name' => 'some-unique-name', 'callback' => array( $obj, 'function' ) );
1679          * @param string $findStep the step to find. Omit to put the step at the beginning
1680          */
1681         public function addInstallStep( $callback, $findStep = 'BEGINNING' ) {
1682                 $this->extraInstallSteps[$findStep][] = $callback;
1683         }
1684
1685         /**
1686          * Disable the time limit for execution.
1687          * Some long-running pages (Install, Upgrade) will want to do this
1688          */
1689         protected function disableTimeLimit() {
1690                 wfSuppressWarnings();
1691                 set_time_limit( 0 );
1692                 wfRestoreWarnings();
1693         }
1694 }