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         /**
  42          * The oldest version of PCRE we can support.
  43          *
  44          * Defining this is necessary because PHP may be linked with a system version
  45          * of PCRE, which may be older than that bundled with the minimum PHP version.
  46          */
  47         const MINIMUM_PCRE_VERSION = '7.2';
  48
  49         /**
  50          * @var array
  51          */
  52         protected $settings;
  53
  54         /**
  55          * List of detected DBs, access using getCompiledDBs().
  56          *
  57          * @var array
  58          */
  59         protected $compiledDBs;
  60
  61         /**
  62          * Cached DB installer instances, access using getDBInstaller().
  63          *
  64          * @var array
  65          */
  66         protected $dbInstallers = array();
  67
  68         /**
  69          * Minimum memory size in MB.
  70          *
  71          * @var int
  72          */
  73         protected $minMemorySize = 50;
  74
  75         /**
  76          * Cached Title, used by parse().
  77          *
  78          * @var Title
  79          */
  80         protected $parserTitle;
  81
  82         /**
  83          * Cached ParserOptions, used by parse().
  84          *
  85          * @var ParserOptions
  86          */
  87         protected $parserOptions;
  88
  89         /**
  90          * Known database types. These correspond to the class names <type>Installer,
  91          * and are also MediaWiki database types valid for $wgDBtype.
  92          *
  93          * To add a new type, create a <type>Installer class and a Database<type>
  94          * class, and add a config-type-<type> message to MessagesEn.php.
  95          *
  96          * @var array
  97          */
  98         protected static $dbTypes = array(
  99                 'mysql',
 100                 'postgres',
 101                 'oracle',
 102                 'mssql',
 103                 'sqlite',
 104         );
 105
 106         /**
 107          * A list of environment check methods called by doEnvironmentChecks().
 108          * These may output warnings using showMessage(), and/or abort the
 109          * installation process by returning false.
 110          *
 111          * For the WebInstaller these are only called on the Welcome page,
 112          * if these methods have side-effects that should affect later page loads
 113          * (as well as the generated stylesheet), use envPreps instead.
 114          *
 115          * @var array
 116          */
 117         protected $envChecks = array(
 118                 'envCheckDB',
 119                 'envCheckRegisterGlobals',
 120                 'envCheckBrokenXML',
 121                 'envCheckMagicQuotes',
 122                 'envCheckMbstring',
 123                 'envCheckSafeMode',
 124                 'envCheckXML',
 125                 'envCheckPCRE',
 126                 'envCheckMemory',
 127                 'envCheckCache',
 128                 'envCheckModSecurity',
 129                 'envCheckDiff3',
 130                 'envCheckGraphics',
 131                 'envCheckGit',
 132                 'envCheckServer',
 133                 'envCheckPath',
 134                 'envCheckShellLocale',
 135                 'envCheckUploadsDirectory',
 136                 'envCheckLibicu',
 137                 'envCheckSuhosinMaxValueLength',
 138                 'envCheckCtype',
 139                 'envCheckIconv',
 140                 'envCheckJSON',
 141         );
 142
 143         /**
 144          * A list of environment preparation methods called by doEnvironmentPreps().
 145          *
 146          * @var array
 147          */
 148         protected $envPreps = array(
 149                 'envPrepServer',
 150                 'envPrepPath',
 151         );
 152
 153         /**
 154          * MediaWiki configuration globals that will eventually be passed through
 155          * to LocalSettings.php. The names only are given here, the defaults
 156          * typically come from DefaultSettings.php.
 157          *
 158          * @var array
 159          */
 160         protected $defaultVarNames = array(
 161                 'wgSitename',
 162                 'wgPasswordSender',
 163                 'wgLanguageCode',
 164                 'wgRightsIcon',
 165                 'wgRightsText',
 166                 'wgRightsUrl',
 167                 'wgMainCacheType',
 168                 'wgEnableEmail',
 169                 'wgEnableUserEmail',
 170                 'wgEnotifUserTalk',
 171                 'wgEnotifWatchlist',
 172                 'wgEmailAuthentication',
 173                 'wgDBtype',
 174                 'wgDiff3',
 175                 'wgImageMagickConvertCommand',
 176                 'wgGitBin',
 177                 'IP',
 178                 'wgScriptPath',
 179                 'wgMetaNamespace',
 180                 'wgDeletedDirectory',
 181                 'wgEnableUploads',
 182                 'wgShellLocale',
 183                 'wgSecretKey',
 184                 'wgUseInstantCommons',
 185                 'wgUpgradeKey',
 186                 'wgDefaultSkin',
 187         );
 188
 189         /**
 190          * Variables that are stored alongside globals, and are used for any
 191          * configuration of the installation process aside from the MediaWiki
 192          * configuration. Map of names to defaults.
 193          *
 194          * @var array
 195          */
 196         protected $internalDefaults = array(
 197                 '_UserLang' => 'en',
 198                 '_Environment' => false,
 199                 '_SafeMode' => false,
 200                 '_RaiseMemory' => false,
 201                 '_UpgradeDone' => false,
 202                 '_InstallDone' => false,
 203                 '_Caches' => array(),
 204                 '_InstallPassword' => '',
 205                 '_SameAccount' => true,
 206                 '_CreateDBAccount' => false,
 207                 '_NamespaceType' => 'site-name',
 208                 '_AdminName' => '', // will be set later, when the user selects language
 209                 '_AdminPassword' => '',
 210                 '_AdminPasswordConfirm' => '',
 211                 '_AdminEmail' => '',
 212                 '_Subscribe' => false,
 213                 '_SkipOptional' => 'continue',
 214                 '_RightsProfile' => 'wiki',
 215                 '_LicenseCode' => 'none',
 216                 '_CCDone' => false,
 217                 '_Extensions' => array(),
 218                 '_Skins' => array(),
 219                 '_MemCachedServers' => '',
 220                 '_UpgradeKeySupplied' => false,
 221                 '_ExistingDBSettings' => false,
 222
 223                 // $wgLogo is probably wrong (bug 48084); set something that will work.
 224                 // Single quotes work fine here, as LocalSettingsGenerator outputs this unescaped.
 225                 'wgLogo' => '$wgResourceBasePath/resources/assets/wiki.png',
 226         );
 227
 228         /**
 229          * The actual list of installation steps. This will be initialized by getInstallSteps()
 230          *
 231          * @var array
 232          */
 233         private $installSteps = array();
 234
 235         /**
 236          * Extra steps for installation, for things like DatabaseInstallers to modify
 237          *
 238          * @var array
 239          */
 240         protected $extraInstallSteps = array();
 241
 242         /**
 243          * Known object cache types and the functions used to test for their existence.
 244          *
 245          * @var array
 246          */
 247         protected $objectCaches = array(
 248                 'xcache' => 'xcache_get',
 249                 'apc' => 'apc_fetch',
 250                 'wincache' => 'wincache_ucache_get'
 251         );
 252
 253         /**
 254          * User rights profiles.
 255          *
 256          * @var array
 257          */
 258         public $rightsProfiles = array(
 259                 'wiki' => array(),
 260                 'no-anon' => array(
 261                         '*' => array( 'edit' => false )
 262                 ),
 263                 'fishbowl' => array(
 264                         '*' => array(
 265                                 'createaccount' => false,
 266                                 'edit' => false,
 267                         ),
 268                 ),
 269                 'private' => array(
 270                         '*' => array(
 271                                 'createaccount' => false,
 272                                 'edit' => false,
 273                                 'read' => false,
 274                         ),
 275                 ),
 276         );
 277
 278         /**
 279          * License types.
 280          *
 281          * @var array
 282          */
 283         public $licenses = array(
 284                 'cc-by' => array(
 285                         'url' => 'https://creativecommons.org/licenses/by/3.0/',
 286                         'icon' => '$wgResourceBasePath/resources/assets/licenses/cc-by.png',
 287                 ),
 288                 'cc-by-sa' => array(
 289                         'url' => 'https://creativecommons.org/licenses/by-sa/3.0/',
 290                         'icon' => '$wgResourceBasePath/resources/assets/licenses/cc-by-sa.png',
 291                 ),
 292                 'cc-by-nc-sa' => array(
 293                         'url' => 'https://creativecommons.org/licenses/by-nc-sa/3.0/',
 294                         'icon' => '$wgResourceBasePath/resources/assets/licenses/cc-by-nc-sa.png',
 295                 ),
 296                 'cc-0' => array(
 297                         'url' => 'https://creativecommons.org/publicdomain/zero/1.0/',
 298                         'icon' => '$wgResourceBasePath/resources/assets/licenses/cc-0.png',
 299                 ),
 300                 'pd' => array(
 301                         'url' => '',
 302                         'icon' => '$wgResourceBasePath/resources/assets/licenses/public-domain.png',
 303                 ),
 304                 'gfdl' => array(
 305                         'url' => 'https://www.gnu.org/copyleft/fdl.html',
 306                         'icon' => '$wgResourceBasePath/resources/assets/licenses/gnu-fdl.png',
 307                 ),
 308                 'none' => array(
 309                         'url' => '',
 310                         'icon' => '',
 311                         'text' => ''
 312                 ),
 313                 'cc-choose' => array(
 314                         // Details will be filled in by the selector.
 315                         'url' => '',
 316                         'icon' => '',
 317                         'text' => '',
 318                 ),
 319         );
 320
 321         /**
 322          * URL to mediawiki-announce subscription
 323          */
 324         protected $mediaWikiAnnounceUrl =
 325                 'https://lists.wikimedia.org/mailman/subscribe/mediawiki-announce';
 326
 327         /**
 328          * Supported language codes for Mailman
 329          */
 330         protected $mediaWikiAnnounceLanguages = array(
 331                 'ca', 'cs', 'da', 'de', 'en', 'es', 'et', 'eu', 'fi', 'fr', 'hr', 'hu',
 332                 'it', 'ja', 'ko', 'lt', 'nl', 'no', 'pl', 'pt', 'pt-br', 'ro', 'ru',
 333                 'sl', 'sr', 'sv', 'tr', 'uk'
 334         );
 335
 336         /**
 337          * UI interface for displaying a short message
 338          * The parameters are like parameters to wfMessage().
 339          * The messages will be in wikitext format, which will be converted to an
 340          * output format such as HTML or text before being sent to the user.
 341          * @param string $msg
 342          */
 343         abstract public function showMessage( $msg /*, ... */ );
 344
 345         /**
 346          * Same as showMessage(), but for displaying errors
 347          * @param string $msg
 348          */
 349         abstract public function showError( $msg /*, ... */ );
 350
 351         /**
 352          * Show a message to the installing user by using a Status object
 353          * @param Status $status
 354          */
 355         abstract public function showStatusMessage( Status $status );
 356
 357         /**
 358          * Constructor, always call this from child classes.
 359          */
 360         public function __construct() {
 361                 global $wgMessagesDirs, $wgUser;
 362
 363                 // Disable the i18n cache
 364                 Language::getLocalisationCache()->disableBackend();
 365                 // Disable LoadBalancer and wfGetDB etc.
 366                 LBFactory::disableBackend();
 367
 368                 // Disable object cache (otherwise CACHE_ANYTHING will try CACHE_DB and
 369                 // SqlBagOStuff will then throw since we just disabled wfGetDB)
 370                 $GLOBALS['wgMemc'] = new EmptyBagOStuff;
 371                 ObjectCache::clear();
 372                 $emptyCache = array( 'class' => 'EmptyBagOStuff' );
 373                 // disable (problematic) object cache types explicitly, preserving all other (working) ones
 374                 // bug T113843
 375                 $GLOBALS['wgObjectCaches'] = array(
 376                         CACHE_NONE => $emptyCache,
 377                         CACHE_DB => $emptyCache,
 378                         CACHE_ANYTHING => $emptyCache,
 379                         CACHE_MEMCACHED => $emptyCache,
 380                 ) + $GLOBALS['wgObjectCaches'];
 381
 382                 // Load the installer's i18n.
 383                 $wgMessagesDirs['MediawikiInstaller'] = __DIR__ . '/i18n';
 384
 385                 // Having a user with id = 0 safeguards us from DB access via User::loadOptions().
 386                 $wgUser = User::newFromId( 0 );
 387
 388                 $this->settings = $this->internalDefaults;
 389
 390                 foreach ( $this->defaultVarNames as $var ) {
 391                         $this->settings[$var] = $GLOBALS[$var];
 392                 }
 393
 394                 $this->doEnvironmentPreps();
 395
 396                 $this->compiledDBs = array();
 397                 foreach ( self::getDBTypes() as $type ) {
 398                         $installer = $this->getDBInstaller( $type );
 399
 400                         if ( !$installer->isCompiled() ) {
 401                                 continue;
 402                         }
 403                         $this->compiledDBs[] = $type;
 404                 }
 405
 406                 $this->parserTitle = Title::newFromText( 'Installer' );
 407                 $this->parserOptions = new ParserOptions; // language will be wrong :(
 408                 $this->parserOptions->setEditSection( false );
 409         }
 410
 411         /**
 412          * Get a list of known DB types.
 413          *
 414          * @return array
 415          */
 416         public static function getDBTypes() {
 417                 return self::$dbTypes;
 418         }
 419
 420         /**
 421          * Do initial checks of the PHP environment. Set variables according to
 422          * the observed environment.
 423          *
 424          * It's possible that this may be called under the CLI SAPI, not the SAPI
 425          * that the wiki will primarily run under. In that case, the subclass should
 426          * initialise variables such as wgScriptPath, before calling this function.
 427          *
 428          * Under the web subclass, it can already be assumed that PHP 5+ is in use
 429          * and that sessions are working.
 430          *
 431          * @return Status
 432          */
 433         public function doEnvironmentChecks() {
 434                 // Php version has already been checked by entry scripts
 435                 // Show message here for information purposes
 436                 if ( wfIsHHVM() ) {
 437                         $this->showMessage( 'config-env-hhvm', HHVM_VERSION );
 438                 } else {
 439                         $this->showMessage( 'config-env-php', PHP_VERSION );
 440                 }
 441
 442                 $good = true;
 443                 // Must go here because an old version of PCRE can prevent other checks from completing
 444                 list( $pcreVersion ) = explode( ' ', PCRE_VERSION, 2 );
 445                 if ( version_compare( $pcreVersion, self::MINIMUM_PCRE_VERSION, '<' ) ) {
 446                         $this->showError( 'config-pcre-old', self::MINIMUM_PCRE_VERSION, $pcreVersion );
 447                         $good = false;
 448                 } else {
 449                         foreach ( $this->envChecks as $check ) {
 450                                 $status = $this->$check();
 451                                 if ( $status === false ) {
 452                                         $good = false;
 453                                 }
 454                         }
 455                 }
 456
 457                 $this->setVar( '_Environment', $good );
 458
 459                 return $good ? Status::newGood() : Status::newFatal( 'config-env-bad' );
 460         }
 461
 462         public function doEnvironmentPreps() {
 463                 foreach ( $this->envPreps as $prep ) {
 464                         $this->$prep();
 465                 }
 466         }
 467
 468         /**
 469          * Set a MW configuration variable, or internal installer configuration variable.
 470          *
 471          * @param string $name
 472          * @param mixed $value
 473          */
 474         public function setVar( $name, $value ) {
 475                 $this->settings[$name] = $value;
 476         }
 477
 478         /**
 479          * Get an MW configuration variable, or internal installer configuration variable.
 480          * The defaults come from $GLOBALS (ultimately DefaultSettings.php).
 481          * Installer variables are typically prefixed by an underscore.
 482          *
 483          * @param string $name
 484          * @param mixed $default
 485          *
 486          * @return mixed
 487          */
 488         public function getVar( $name, $default = null ) {
 489                 if ( !isset( $this->settings[$name] ) ) {
 490                         return $default;
 491                 } else {
 492                         return $this->settings[$name];
 493                 }
 494         }
 495
 496         /**
 497          * Get a list of DBs supported by current PHP setup
 498          *
 499          * @return array
 500          */
 501         public function getCompiledDBs() {
 502                 return $this->compiledDBs;
 503         }
 504
 505         /**
 506          * Get an instance of DatabaseInstaller for the specified DB type.
 507          *
 508          * @param mixed $type DB installer for which is needed, false to use default.
 509          *
 510          * @return DatabaseInstaller
 511          */
 512         public function getDBInstaller( $type = false ) {
 513                 if ( !$type ) {
 514                         $type = $this->getVar( 'wgDBtype' );
 515                 }
 516
 517                 $type = strtolower( $type );
 518
 519                 if ( !isset( $this->dbInstallers[$type] ) ) {
 520                         $class = ucfirst( $type ) . 'Installer';
 521                         $this->dbInstallers[$type] = new $class( $this );
 522                 }
 523
 524                 return $this->dbInstallers[$type];
 525         }
 526
 527         /**
 528          * Determine if LocalSettings.php exists. If it does, return its variables.
 529          *
 530          * @return array
 531          */
 532         public static function getExistingLocalSettings() {
 533                 global $IP;
 534
 535                 // You might be wondering why this is here. Well if you don't do this
 536                 // then some poorly-formed extensions try to call their own classes
 537                 // after immediately registering them. We really need to get extension
 538                 // registration out of the global scope and into a real format.
 539                 // @see https://phabricator.wikimedia.org/T69440
 540                 global $wgAutoloadClasses;
 541                 $wgAutoloadClasses = array();
 542
 543                 // @codingStandardsIgnoreStart
 544                 // LocalSettings.php should not call functions, except wfLoadSkin/wfLoadExtensions
 545                 // Define the required globals here, to ensure, the functions can do it work correctly.
 546                 global $wgExtensionDirectory, $wgStyleDirectory;
 547                 // @codingStandardsIgnoreEnd
 548
 549                 MediaWiki\suppressWarnings();
 550                 $_lsExists = file_exists( "$IP/LocalSettings.php" );
 551                 MediaWiki\restoreWarnings();
 552
 553                 if ( !$_lsExists ) {
 554                         return false;
 555                 }
 556                 unset( $_lsExists );
 557
 558                 require "$IP/includes/DefaultSettings.php";
 559                 require "$IP/LocalSettings.php";
 560
 561                 return get_defined_vars();
 562         }
 563
 564         /**
 565          * Get a fake password for sending back to the user in HTML.
 566          * This is a security mechanism to avoid compromise of the password in the
 567          * event of session ID compromise.
 568          *
 569          * @param string $realPassword
 570          *
 571          * @return string
 572          */
 573         public function getFakePassword( $realPassword ) {
 574                 return str_repeat( '*', strlen( $realPassword ) );
 575         }
 576
 577         /**
 578          * Set a variable which stores a password, except if the new value is a
 579          * fake password in which case leave it as it is.
 580          *
 581          * @param string $name
 582          * @param mixed $value
 583          */
 584         public function setPassword( $name, $value ) {
 585                 if ( !preg_match( '/^\*+$/', $value ) ) {
 586                         $this->setVar( $name, $value );
 587                 }
 588         }
 589
 590         /**
 591          * On POSIX systems return the primary group of the webserver we're running under.
 592          * On other systems just returns null.
 593          *
 594          * This is used to advice the user that he should chgrp his mw-config/data/images directory as the
 595          * webserver user before he can install.
 596          *
 597          * Public because SqliteInstaller needs it, and doesn't subclass Installer.
 598          *
 599          * @return mixed
 600          */
 601         public static function maybeGetWebserverPrimaryGroup() {
 602                 if ( !function_exists( 'posix_getegid' ) || !function_exists( 'posix_getpwuid' ) ) {
 603                         # I don't know this, this isn't UNIX.
 604                         return null;
 605                 }
 606
 607                 # posix_getegid() *not* getmygid() because we want the group of the webserver,
 608                 # not whoever owns the current script.
 609                 $gid = posix_getegid();
 610                 $getpwuid = posix_getpwuid( $gid );
 611                 $group = $getpwuid['name'];
 612
 613                 return $group;
 614         }
 615
 616         /**
 617          * Convert wikitext $text to HTML.
 618          *
 619          * This is potentially error prone since many parser features require a complete
 620          * installed MW database. The solution is to just not use those features when you
 621          * write your messages. This appears to work well enough. Basic formatting and
 622          * external links work just fine.
 623          *
 624          * But in case a translator decides to throw in a "#ifexist" or internal link or
 625          * whatever, this function is guarded to catch the attempted DB access and to present
 626          * some fallback text.
 627          *
 628          * @param string $text
 629          * @param bool $lineStart
 630          * @return string
 631          */
 632         public function parse( $text, $lineStart = false ) {
 633                 global $wgParser;
 634
 635                 try {
 636                         $out = $wgParser->parse( $text, $this->parserTitle, $this->parserOptions, $lineStart );
 637                         $html = $out->getText();
 638                 } catch ( DBAccessError $e ) {
 639                         $html = '<!--DB access attempted during parse-->  ' . htmlspecialchars( $text );
 640
 641                         if ( !empty( $this->debug ) ) {
 642                                 $html .= "<!--\n" . $e->getTraceAsString() . "\n-->";
 643                         }
 644                 }
 645
 646                 return $html;
 647         }
 648
 649         /**
 650          * @return ParserOptions
 651          */
 652         public function getParserOptions() {
 653                 return $this->parserOptions;
 654         }
 655
 656         public function disableLinkPopups() {
 657                 $this->parserOptions->setExternalLinkTarget( false );
 658         }
 659
 660         public function restoreLinkPopups() {
 661                 global $wgExternalLinkTarget;
 662                 $this->parserOptions->setExternalLinkTarget( $wgExternalLinkTarget );
 663         }
 664
 665         /**
 666          * Install step which adds a row to the site_stats table with appropriate
 667          * initial values.
 668          *
 669          * @param DatabaseInstaller $installer
 670          *
 671          * @return Status
 672          */
 673         public function populateSiteStats( DatabaseInstaller $installer ) {
 674                 $status = $installer->getConnection();
 675                 if ( !$status->isOK() ) {
 676                         return $status;
 677                 }
 678                 $status->value->insert(
 679                         'site_stats',
 680                         array(
 681                                 'ss_row_id' => 1,
 682                                 'ss_total_edits' => 0,
 683                                 'ss_good_articles' => 0,
 684                                 'ss_total_pages' => 0,
 685                                 'ss_users' => 0,
 686                                 'ss_images' => 0
 687                         ),
 688                         __METHOD__, 'IGNORE'
 689                 );
 690
 691                 return Status::newGood();
 692         }
 693
 694         /**
 695          * Exports all wg* variables stored by the installer into global scope.
 696          */
 697         public function exportVars() {
 698                 foreach ( $this->settings as $name => $value ) {
 699                         if ( substr( $name, 0, 2 ) == 'wg' ) {
 700                                 $GLOBALS[$name] = $value;
 701                         }
 702                 }
 703         }
 704
 705         /**
 706          * Environment check for DB types.
 707          * @return bool
 708          */
 709         protected function envCheckDB() {
 710                 global $wgLang;
 711
 712                 $allNames = array();
 713
 714                 // Messages: config-type-mysql, config-type-postgres, config-type-oracle,
 715                 // config-type-sqlite
 716                 foreach ( self::getDBTypes() as $name ) {
 717                         $allNames[] = wfMessage( "config-type-$name" )->text();
 718                 }
 719
 720                 $databases = $this->getCompiledDBs();
 721
 722                 $databases = array_flip( $databases );
 723                 foreach ( array_keys( $databases ) as $db ) {
 724                         $installer = $this->getDBInstaller( $db );
 725                         $status = $installer->checkPrerequisites();
 726                         if ( !$status->isGood() ) {
 727                                 $this->showStatusMessage( $status );
 728                         }
 729                         if ( !$status->isOK() ) {
 730                                 unset( $databases[$db] );
 731                         }
 732                 }
 733                 $databases = array_flip( $databases );
 734                 if ( !$databases ) {
 735                         $this->showError( 'config-no-db', $wgLang->commaList( $allNames ), count( $allNames ) );
 736
 737                         // @todo FIXME: This only works for the web installer!
 738                         return false;
 739                 }
 740
 741                 return true;
 742         }
 743
 744         /**
 745          * Environment check for register_globals.
 746          * Prevent installation if enabled
 747          * @return bool
 748          */
 749         protected function envCheckRegisterGlobals() {
 750                 if ( wfIniGetBool( 'register_globals' ) ) {
 751                         $this->showMessage( 'config-register-globals-error' );
 752                         return false;
 753                 }
 754
 755                 return true;
 756         }
 757
 758         /**
 759          * Some versions of libxml+PHP break < and > encoding horribly
 760          * @return bool
 761          */
 762         protected function envCheckBrokenXML() {
 763                 $test = new PhpXmlBugTester();
 764                 if ( !$test->ok ) {
 765                         $this->showError( 'config-brokenlibxml' );
 766
 767                         return false;
 768                 }
 769
 770                 return true;
 771         }
 772
 773         /**
 774          * Environment check for magic_quotes_(gpc|runtime|sybase).
 775          * @return bool
 776          */
 777         protected function envCheckMagicQuotes() {
 778                 $status = true;
 779                 foreach ( array( 'gpc', 'runtime', 'sybase' ) as $magicJunk ) {
 780                         if ( wfIniGetBool( "magic_quotes_$magicJunk" ) ) {
 781                                 $this->showError( "config-magic-quotes-$magicJunk" );
 782                                 $status = false;
 783                         }
 784                 }
 785
 786                 return $status;
 787         }
 788
 789         /**
 790          * Environment check for mbstring.func_overload.
 791          * @return bool
 792          */
 793         protected function envCheckMbstring() {
 794                 if ( wfIniGetBool( 'mbstring.func_overload' ) ) {
 795                         $this->showError( 'config-mbstring' );
 796
 797                         return false;
 798                 }
 799
 800                 return true;
 801         }
 802
 803         /**
 804          * Environment check for safe_mode.
 805          * @return bool
 806          */
 807         protected function envCheckSafeMode() {
 808                 if ( wfIniGetBool( 'safe_mode' ) ) {
 809                         $this->setVar( '_SafeMode', true );
 810                         $this->showMessage( 'config-safe-mode' );
 811                 }
 812
 813                 return true;
 814         }
 815
 816         /**
 817          * Environment check for the XML module.
 818          * @return bool
 819          */
 820         protected function envCheckXML() {
 821                 if ( !function_exists( "utf8_encode" ) ) {
 822                         $this->showError( 'config-xml-bad' );
 823
 824                         return false;
 825                 }
 826
 827                 return true;
 828         }
 829
 830         /**
 831          * Environment check for the PCRE module.
 832          *
 833          * @note If this check were to fail, the parser would
 834          *   probably throw an exception before the result
 835          *   of this check is shown to the user.
 836          * @return bool
 837          */
 838         protected function envCheckPCRE() {
 839                 MediaWiki\suppressWarnings();
 840                 $regexd = preg_replace( '/[\x{0430}-\x{04FF}]/iu', '', '-АБВГД-' );
 841                 // Need to check for \p support too, as PCRE can be compiled
 842                 // with utf8 support, but not unicode property support.
 843                 // check that \p{Zs} (space separators) matches
 844                 // U+3000 (Ideographic space)
 845                 $regexprop = preg_replace( '/\p{Zs}/u', '', "-\xE3\x80\x80-" );
 846                 MediaWiki\restoreWarnings();
 847                 if ( $regexd != '--' || $regexprop != '--' ) {
 848                         $this->showError( 'config-pcre-no-utf8' );
 849
 850                         return false;
 851                 }
 852
 853                 return true;
 854         }
 855
 856         /**
 857          * Environment check for available memory.
 858          * @return bool
 859          */
 860         protected function envCheckMemory() {
 861                 $limit = ini_get( 'memory_limit' );
 862
 863                 if ( !$limit || $limit == -1 ) {
 864                         return true;
 865                 }
 866
 867                 $n = wfShorthandToInteger( $limit );
 868
 869                 if ( $n < $this->minMemorySize * 1024 * 1024 ) {
 870                         $newLimit = "{$this->minMemorySize}M";
 871
 872                         if ( ini_set( "memory_limit", $newLimit ) === false ) {
 873                                 $this->showMessage( 'config-memory-bad', $limit );
 874                         } else {
 875                                 $this->showMessage( 'config-memory-raised', $limit, $newLimit );
 876                                 $this->setVar( '_RaiseMemory', true );
 877                         }
 878                 }
 879
 880                 return true;
 881         }
 882
 883         /**
 884          * Environment check for compiled object cache types.
 885          */
 886         protected function envCheckCache() {
 887                 $caches = array();
 888                 foreach ( $this->objectCaches as $name => $function ) {
 889                         if ( function_exists( $function ) ) {
 890                                 if ( $name == 'xcache' && !wfIniGetBool( 'xcache.var_size' ) ) {
 891                                         continue;
 892                                 }
 893                                 $caches[$name] = true;
 894                         }
 895                 }
 896
 897                 if ( !$caches ) {
 898                         $this->showMessage( 'config-no-cache' );
 899                 }
 900
 901                 $this->setVar( '_Caches', $caches );
 902         }
 903
 904         /**
 905          * Scare user to death if they have mod_security or mod_security2
 906          * @return bool
 907          */
 908         protected function envCheckModSecurity() {
 909                 if ( self::apacheModulePresent( 'mod_security' )
 910                         || self::apacheModulePresent( 'mod_security2' ) ) {
 911                         $this->showMessage( 'config-mod-security' );
 912                 }
 913
 914                 return true;
 915         }
 916
 917         /**
 918          * Search for GNU diff3.
 919          * @return bool
 920          */
 921         protected function envCheckDiff3() {
 922                 $names = array( "gdiff3", "diff3", "diff3.exe" );
 923                 $versionInfo = array( '$1 --version 2>&1', 'GNU diffutils' );
 924
 925                 $diff3 = self::locateExecutableInDefaultPaths( $names, $versionInfo );
 926
 927                 if ( $diff3 ) {
 928                         $this->setVar( 'wgDiff3', $diff3 );
 929                 } else {
 930                         $this->setVar( 'wgDiff3', false );
 931                         $this->showMessage( 'config-diff3-bad' );
 932                 }
 933
 934                 return true;
 935         }
 936
 937         /**
 938          * Environment check for ImageMagick and GD.
 939          * @return bool
 940          */
 941         protected function envCheckGraphics() {
 942                 $names = array( wfIsWindows() ? 'convert.exe' : 'convert' );
 943                 $versionInfo = array( '$1 -version', 'ImageMagick' );
 944                 $convert = self::locateExecutableInDefaultPaths( $names, $versionInfo );
 945
 946                 $this->setVar( 'wgImageMagickConvertCommand', '' );
 947                 if ( $convert ) {
 948                         $this->setVar( 'wgImageMagickConvertCommand', $convert );
 949                         $this->showMessage( 'config-imagemagick', $convert );
 950
 951                         return true;
 952                 } elseif ( function_exists( 'imagejpeg' ) ) {
 953                         $this->showMessage( 'config-gd' );
 954                 } else {
 955                         $this->showMessage( 'config-no-scaling' );
 956                 }
 957
 958                 return true;
 959         }
 960
 961         /**
 962          * Search for git.
 963          *
 964          * @since 1.22
 965          * @return bool
 966          */
 967         protected function envCheckGit() {
 968                 $names = array( wfIsWindows() ? 'git.exe' : 'git' );
 969                 $versionInfo = array( '$1 --version', 'git version' );
 970
 971                 $git = self::locateExecutableInDefaultPaths( $names, $versionInfo );
 972
 973                 if ( $git ) {
 974                         $this->setVar( 'wgGitBin', $git );
 975                         $this->showMessage( 'config-git', $git );
 976                 } else {
 977                         $this->setVar( 'wgGitBin', false );
 978                         $this->showMessage( 'config-git-bad' );
 979                 }
 980
 981                 return true;
 982         }
 983
 984         /**
 985          * Environment check to inform user which server we've assumed.
 986          *
 987          * @return bool
 988          */
 989         protected function envCheckServer() {
 990                 $server = $this->envGetDefaultServer();
 991                 if ( $server !== null ) {
 992                         $this->showMessage( 'config-using-server', $server );
 993                 }
 994                 return true;
 995         }
 996
 997         /**
 998          * Environment check to inform user which paths we've assumed.
 999          *
1000          * @return bool
1001          */
1002         protected function envCheckPath() {
1003                 $this->showMessage(
1004                         'config-using-uri',
1005                         $this->getVar( 'wgServer' ),
1006                         $this->getVar( 'wgScriptPath' )
1007                 );
1008                 return true;
1009         }
1010
1011         /**
1012          * Environment check for preferred locale in shell
1013          * @return bool
1014          */
1015         protected function envCheckShellLocale() {
1016                 $os = php_uname( 's' );
1017                 $supported = array( 'Linux', 'SunOS', 'HP-UX', 'Darwin' ); # Tested these
1018
1019                 if ( !in_array( $os, $supported ) ) {
1020                         return true;
1021                 }
1022
1023                 # Get a list of available locales.
1024                 $ret = false;
1025                 $lines = wfShellExec( '/usr/bin/locale -a', $ret );
1026
1027                 if ( $ret ) {
1028                         return true;
1029                 }
1030
1031                 $lines = array_map( 'trim', explode( "\n", $lines ) );
1032                 $candidatesByLocale = array();
1033                 $candidatesByLang = array();
1034
1035                 foreach ( $lines as $line ) {
1036                         if ( $line === '' ) {
1037                                 continue;
1038                         }
1039
1040                         if ( !preg_match( '/^([a-zA-Z]+)(_[a-zA-Z]+|)\.(utf8|UTF-8)(@[a-zA-Z_]*|)$/i', $line, $m ) ) {
1041                                 continue;
1042                         }
1043
1044                         list( , $lang, , , ) = $m;
1045
1046                         $candidatesByLocale[$m[0]] = $m;
1047                         $candidatesByLang[$lang][] = $m;
1048                 }
1049
1050                 # Try the current value of LANG.
1051                 if ( isset( $candidatesByLocale[getenv( 'LANG' )] ) ) {
1052                         $this->setVar( 'wgShellLocale', getenv( 'LANG' ) );
1053
1054                         return true;
1055                 }
1056
1057                 # Try the most common ones.
1058                 $commonLocales = array( 'en_US.UTF-8', 'en_US.utf8', 'de_DE.UTF-8', 'de_DE.utf8' );
1059                 foreach ( $commonLocales as $commonLocale ) {
1060                         if ( isset( $candidatesByLocale[$commonLocale] ) ) {
1061                                 $this->setVar( 'wgShellLocale', $commonLocale );
1062
1063                                 return true;
1064                         }
1065                 }
1066
1067                 # Is there an available locale in the Wiki's language?
1068                 $wikiLang = $this->getVar( 'wgLanguageCode' );
1069
1070                 if ( isset( $candidatesByLang[$wikiLang] ) ) {
1071                         $m = reset( $candidatesByLang[$wikiLang] );
1072                         $this->setVar( 'wgShellLocale', $m[0] );
1073
1074                         return true;
1075                 }
1076
1077                 # Are there any at all?
1078                 if ( count( $candidatesByLocale ) ) {
1079                         $m = reset( $candidatesByLocale );
1080                         $this->setVar( 'wgShellLocale', $m[0] );
1081
1082                         return true;
1083                 }
1084
1085                 # Give up.
1086                 return true;
1087         }
1088
1089         /**
1090          * Environment check for the permissions of the uploads directory
1091          * @return bool
1092          */
1093         protected function envCheckUploadsDirectory() {
1094                 global $IP;
1095
1096                 $dir = $IP . '/images/';
1097                 $url = $this->getVar( 'wgServer' ) . $this->getVar( 'wgScriptPath' ) . '/images/';
1098                 $safe = !$this->dirIsExecutable( $dir, $url );
1099
1100                 if ( !$safe ) {
1101                         $this->showMessage( 'config-uploads-not-safe', $dir );
1102                 }
1103
1104                 return true;
1105         }
1106
1107         /**
1108          * Checks if suhosin.get.max_value_length is set, and if so generate
1109          * a warning because it decreases ResourceLoader performance.
1110          * @return bool
1111          */
1112         protected function envCheckSuhosinMaxValueLength() {
1113                 $maxValueLength = ini_get( 'suhosin.get.max_value_length' );
1114                 if ( $maxValueLength > 0 && $maxValueLength < 1024 ) {
1115                         // Only warn if the value is below the sane 1024
1116                         $this->showMessage( 'config-suhosin-max-value-length', $maxValueLength );
1117                 }
1118
1119                 return true;
1120         }
1121
1122         /**
1123          * Convert a hex string representing a Unicode code point to that code point.
1124          * @param string $c
1125          * @return string
1126          */
1127         protected function unicodeChar( $c ) {
1128                 $c = hexdec( $c );
1129                 if ( $c <= 0x7F ) {
1130                         return chr( $c );
1131                 } elseif ( $c <= 0x7FF ) {
1132                         return chr( 0xC0 | $c >> 6 ) . chr( 0x80 | $c & 0x3F );
1133                 } elseif ( $c <= 0xFFFF ) {
1134                         return chr( 0xE0 | $c >> 12 ) . chr( 0x80 | $c >> 6 & 0x3F ) .
1135                                 chr( 0x80 | $c & 0x3F );
1136                 } elseif ( $c <= 0x10FFFF ) {
1137                         return chr( 0xF0 | $c >> 18 ) . chr( 0x80 | $c >> 12 & 0x3F ) .
1138                                 chr( 0x80 | $c >> 6 & 0x3F ) .
1139                                 chr( 0x80 | $c & 0x3F );
1140                 } else {
1141                         return false;
1142                 }
1143         }
1144
1145         /**
1146          * Check the libicu version
1147          */
1148         protected function envCheckLibicu() {
1149                 /**
1150                  * This needs to be updated something that the latest libicu
1151                  * will properly normalize.  This normalization was found at
1152                  * http://www.unicode.org/versions/Unicode5.2.0/#Character_Additions
1153                  * Note that we use the hex representation to create the code
1154                  * points in order to avoid any Unicode-destroying during transit.
1155                  */
1156                 $not_normal_c = $this->unicodeChar( "FA6C" );
1157                 $normal_c = $this->unicodeChar( "242EE" );
1158
1159                 $useNormalizer = 'php';
1160                 $needsUpdate = false;
1161
1162                 if ( function_exists( 'normalizer_normalize' ) ) {
1163                         $useNormalizer = 'intl';
1164                         $intl = normalizer_normalize( $not_normal_c, Normalizer::FORM_C );
1165                         if ( $intl !== $normal_c ) {
1166                                 $needsUpdate = true;
1167                         }
1168                 }
1169
1170                 // Uses messages 'config-unicode-using-php' and 'config-unicode-using-intl'
1171                 if ( $useNormalizer === 'php' ) {
1172                         $this->showMessage( 'config-unicode-pure-php-warning' );
1173                 } else {
1174                         $this->showMessage( 'config-unicode-using-' . $useNormalizer );
1175                         if ( $needsUpdate ) {
1176                                 $this->showMessage( 'config-unicode-update-warning' );
1177                         }
1178                 }
1179         }
1180
1181         /**
1182          * @return bool
1183          */
1184         protected function envCheckCtype() {
1185                 if ( !function_exists( 'ctype_digit' ) ) {
1186                         $this->showError( 'config-ctype' );
1187
1188                         return false;
1189                 }
1190
1191                 return true;
1192         }
1193
1194         /**
1195          * @return bool
1196          */
1197         protected function envCheckIconv() {
1198                 if ( !function_exists( 'iconv' ) ) {
1199                         $this->showError( 'config-iconv' );
1200
1201                         return false;
1202                 }
1203
1204                 return true;
1205         }
1206
1207         /**
1208          * @return bool
1209          */
1210         protected function envCheckJSON() {
1211                 if ( !function_exists( 'json_decode' ) ) {
1212                         $this->showError( 'config-json' );
1213
1214                         return false;
1215                 }
1216
1217                 return true;
1218         }
1219
1220         /**
1221          * Environment prep for the server hostname.
1222          */
1223         protected function envPrepServer() {
1224                 $server = $this->envGetDefaultServer();
1225                 if ( $server !== null ) {
1226                         $this->setVar( 'wgServer', $server );
1227                 }
1228         }
1229
1230         /**
1231          * Helper function to be called from envPrepServer()
1232          * @return string
1233          */
1234         abstract protected function envGetDefaultServer();
1235
1236         /**
1237          * Environment prep for setting $IP and $wgScriptPath.
1238          */
1239         protected function envPrepPath() {
1240                 global $IP;
1241                 $IP = dirname( dirname( __DIR__ ) );
1242                 $this->setVar( 'IP', $IP );
1243         }
1244
1245         /**
1246          * Get an array of likely places we can find executables. Check a bunch
1247          * of known Unix-like defaults, as well as the PATH environment variable
1248          * (which should maybe make it work for Windows?)
1249          *
1250          * @return array
1251          */
1252         protected static function getPossibleBinPaths() {
1253                 return array_merge(
1254                         array( '/usr/bin', '/usr/local/bin', '/opt/csw/bin',
1255                                 '/usr/gnu/bin', '/usr/sfw/bin', '/sw/bin', '/opt/local/bin' ),
1256                         explode( PATH_SEPARATOR, getenv( 'PATH' ) )
1257                 );
1258         }
1259
1260         /**
1261          * Search a path for any of the given executable names. Returns the
1262          * executable name if found. Also checks the version string returned
1263          * by each executable.
1264          *
1265          * Used only by environment checks.
1266          *
1267          * @param string $path Path to search
1268          * @param array $names Array of executable names
1269          * @param array|bool $versionInfo False or array with two members:
1270          *   0 => Command to run for version check, with $1 for the full executable name
1271          *   1 => String to compare the output with
1272          *
1273          * If $versionInfo is not false, only executables with a version
1274          * matching $versionInfo[1] will be returned.
1275          * @return bool|string
1276          */
1277         public static function locateExecutable( $path, $names, $versionInfo = false ) {
1278                 if ( !is_array( $names ) ) {
1279                         $names = array( $names );
1280                 }
1281
1282                 foreach ( $names as $name ) {
1283                         $command = $path . DIRECTORY_SEPARATOR . $name;
1284
1285                         MediaWiki\suppressWarnings();
1286                         $file_exists = file_exists( $command );
1287                         MediaWiki\restoreWarnings();
1288
1289                         if ( $file_exists ) {
1290                                 if ( !$versionInfo ) {
1291                                         return $command;
1292                                 }
1293
1294                                 $file = str_replace( '$1', wfEscapeShellArg( $command ), $versionInfo[0] );
1295                                 if ( strstr( wfShellExec( $file ), $versionInfo[1] ) !== false ) {
1296                                         return $command;
1297                                 }
1298                         }
1299                 }
1300
1301                 return false;
1302         }
1303
1304         /**
1305          * Same as locateExecutable(), but checks in getPossibleBinPaths() by default
1306          * @see locateExecutable()
1307          * @param array $names Array of possible names.
1308          * @param array|bool $versionInfo Default: false or array with two members:
1309          *   0 => Command to run for version check, with $1 for the full executable name
1310          *   1 => String to compare the output with
1311          *
1312          * If $versionInfo is not false, only executables with a version
1313          * matching $versionInfo[1] will be returned.
1314          * @return bool|string
1315          */
1316         public static function locateExecutableInDefaultPaths( $names, $versionInfo = false ) {
1317                 foreach ( self::getPossibleBinPaths() as $path ) {
1318                         $exe = self::locateExecutable( $path, $names, $versionInfo );
1319                         if ( $exe !== false ) {
1320                                 return $exe;
1321                         }
1322                 }
1323
1324                 return false;
1325         }
1326
1327         /**
1328          * Checks if scripts located in the given directory can be executed via the given URL.
1329          *
1330          * Used only by environment checks.
1331          * @param string $dir
1332          * @param string $url
1333          * @return bool|int|string
1334          */
1335         public function dirIsExecutable( $dir, $url ) {
1336                 $scriptTypes = array(
1337                         'php' => array(
1338                                 "<?php echo 'ex' . 'ec';",
1339                                 "#!/var/env php5\n<?php echo 'ex' . 'ec';",
1340                         ),
1341                 );
1342
1343                 // it would be good to check other popular languages here, but it'll be slow.
1344
1345                 MediaWiki\suppressWarnings();
1346
1347                 foreach ( $scriptTypes as $ext => $contents ) {
1348                         foreach ( $contents as $source ) {
1349                                 $file = 'exectest.' . $ext;
1350
1351                                 if ( !file_put_contents( $dir . $file, $source ) ) {
1352                                         break;
1353                                 }
1354
1355                                 try {
1356                                         $text = Http::get( $url . $file, array( 'timeout' => 3 ), __METHOD__ );
1357                                 } catch ( Exception $e ) {
1358                                         // Http::get throws with allow_url_fopen = false and no curl extension.
1359                                         $text = null;
1360                                 }
1361                                 unlink( $dir . $file );
1362
1363                                 if ( $text == 'exec' ) {
1364                                         MediaWiki\restoreWarnings();
1365
1366                                         return $ext;
1367                                 }
1368                         }
1369                 }
1370
1371                 MediaWiki\restoreWarnings();
1372
1373                 return false;
1374         }
1375
1376         /**
1377          * Checks for presence of an Apache module. Works only if PHP is running as an Apache module, too.
1378          *
1379          * @param string $moduleName Name of module to check.
1380          * @return bool
1381          */
1382         public static function apacheModulePresent( $moduleName ) {
1383                 if ( function_exists( 'apache_get_modules' ) && in_array( $moduleName, apache_get_modules() ) ) {
1384                         return true;
1385                 }
1386                 // try it the hard way
1387                 ob_start();
1388                 phpinfo( INFO_MODULES );
1389                 $info = ob_get_clean();
1390
1391                 return strpos( $info, $moduleName ) !== false;
1392         }
1393
1394         /**
1395          * ParserOptions are constructed before we determined the language, so fix it
1396          *
1397          * @param Language $lang
1398          */
1399         public function setParserLanguage( $lang ) {
1400                 $this->parserOptions->setTargetLanguage( $lang );
1401                 $this->parserOptions->setUserLang( $lang );
1402         }
1403
1404         /**
1405          * Overridden by WebInstaller to provide lastPage parameters.
1406          * @param string $page
1407          * @return string
1408          */
1409         protected function getDocUrl( $page ) {
1410                 return "{$_SERVER['PHP_SELF']}?page=" . urlencode( $page );
1411         }
1412
1413         /**
1414          * Finds extensions that follow the format /$directory/Name/Name.php,
1415          * and returns an array containing the value for 'Name' for each found extension.
1416          *
1417          * Reasonable values for $directory include 'extensions' (the default) and 'skins'.
1418          *
1419          * @param string $directory Directory to search in
1420          * @return array
1421          */
1422         public function findExtensions( $directory = 'extensions' ) {
1423                 if ( $this->getVar( 'IP' ) === null ) {
1424                         return array();
1425                 }
1426
1427                 $extDir = $this->getVar( 'IP' ) . '/' . $directory;
1428                 if ( !is_readable( $extDir ) || !is_dir( $extDir ) ) {
1429                         return array();
1430                 }
1431
1432                 // extensions -> extension.json, skins -> skin.json
1433                 $jsonFile = substr( $directory, 0, strlen( $directory ) -1 ) . '.json';
1434
1435                 $dh = opendir( $extDir );
1436                 $exts = array();
1437                 while ( ( $file = readdir( $dh ) ) !== false ) {
1438                         if ( !is_dir( "$extDir/$file" ) ) {
1439                                 continue;
1440                         }
1441                         if ( file_exists( "$extDir/$file/$jsonFile" ) || file_exists( "$extDir/$file/$file.php" ) ) {
1442                                 $exts[] = $file;
1443                         }
1444                 }
1445                 closedir( $dh );
1446                 natcasesort( $exts );
1447
1448                 return $exts;
1449         }
1450
1451         /**
1452          * Returns a default value to be used for $wgDefaultSkin: normally the one set in DefaultSettings,
1453          * but will fall back to another if the default skin is missing and some other one is present
1454          * instead.
1455          *
1456          * @param string[] $skinNames Names of installed skins.
1457          * @return string
1458          */
1459         public function getDefaultSkin( array $skinNames ) {
1460                 $defaultSkin = $GLOBALS['wgDefaultSkin'];
1461                 if ( !$skinNames || in_array( $defaultSkin, $skinNames ) ) {
1462                         return $defaultSkin;
1463                 } else {
1464                         return $skinNames[0];
1465                 }
1466         }
1467
1468         /**
1469          * Installs the auto-detected extensions.
1470          *
1471          * @return Status
1472          */
1473         protected function includeExtensions() {
1474                 global $IP;
1475                 $exts = $this->getVar( '_Extensions' );
1476                 $IP = $this->getVar( 'IP' );
1477
1478                 /**
1479                  * We need to include DefaultSettings before including extensions to avoid
1480                  * warnings about unset variables. However, the only thing we really
1481                  * want here is $wgHooks['LoadExtensionSchemaUpdates']. This won't work
1482                  * if the extension has hidden hook registration in $wgExtensionFunctions,
1483                  * but we're not opening that can of worms
1484                  * @see https://phabricator.wikimedia.org/T28857
1485                  */
1486                 global $wgAutoloadClasses;
1487                 $wgAutoloadClasses = array();
1488                 $queue = array();
1489
1490                 require "$IP/includes/DefaultSettings.php";
1491
1492                 foreach ( $exts as $e ) {
1493                         if ( file_exists( "$IP/extensions/$e/extension.json" ) ) {
1494                                 $queue["$IP/extensions/$e/extension.json"] = 1;
1495                         } else {
1496                                 require_once "$IP/extensions/$e/$e.php";
1497                         }
1498                 }
1499
1500                 $registry = new ExtensionRegistry();
1501                 $data = $registry->readFromQueue( $queue );
1502                 $wgAutoloadClasses += $data['autoload'];
1503
1504                 $hooksWeWant = isset( $wgHooks['LoadExtensionSchemaUpdates'] ) ?
1505                         $wgHooks['LoadExtensionSchemaUpdates'] : array();
1506
1507                 if ( isset( $data['globals']['wgHooks']['LoadExtensionSchemaUpdates'] ) ) {
1508                         $hooksWeWant = array_merge_recursive(
1509                                 $hooksWeWant,
1510                                 $data['globals']['wgHooks']['LoadExtensionSchemaUpdates']
1511                         );
1512                 }
1513                 // Unset everyone else's hooks. Lord knows what someone might be doing
1514                 // in ParserFirstCallInit (see bug 27171)
1515                 $GLOBALS['wgHooks'] = array( 'LoadExtensionSchemaUpdates' => $hooksWeWant );
1516
1517                 return Status::newGood();
1518         }
1519
1520         /**
1521          * Get an array of install steps. Should always be in the format of
1522          * array(
1523          *   'name'     => 'someuniquename',
1524          *   'callback' => array( $obj, 'method' ),
1525          * )
1526          * There must be a config-install-$name message defined per step, which will
1527          * be shown on install.
1528          *
1529          * @param DatabaseInstaller $installer DatabaseInstaller so we can make callbacks
1530          * @return array
1531          */
1532         protected function getInstallSteps( DatabaseInstaller $installer ) {
1533                 $coreInstallSteps = array(
1534                         array( 'name' => 'database', 'callback' => array( $installer, 'setupDatabase' ) ),
1535                         array( 'name' => 'tables', 'callback' => array( $installer, 'createTables' ) ),
1536                         array( 'name' => 'interwiki', 'callback' => array( $installer, 'populateInterwikiTable' ) ),
1537                         array( 'name' => 'stats', 'callback' => array( $this, 'populateSiteStats' ) ),
1538                         array( 'name' => 'keys', 'callback' => array( $this, 'generateKeys' ) ),
1539                         array( 'name' => 'updates', 'callback' => array( $installer, 'insertUpdateKeys' ) ),
1540                         array( 'name' => 'sysop', 'callback' => array( $this, 'createSysop' ) ),
1541                         array( 'name' => 'mainpage', 'callback' => array( $this, 'createMainpage' ) ),
1542                 );
1543
1544                 // Build the array of install steps starting from the core install list,
1545                 // then adding any callbacks that wanted to attach after a given step
1546                 foreach ( $coreInstallSteps as $step ) {
1547                         $this->installSteps[] = $step;
1548                         if ( isset( $this->extraInstallSteps[$step['name']] ) ) {
1549                                 $this->installSteps = array_merge(
1550                                         $this->installSteps,
1551                                         $this->extraInstallSteps[$step['name']]
1552                                 );
1553                         }
1554                 }
1555
1556                 // Prepend any steps that want to be at the beginning
1557                 if ( isset( $this->extraInstallSteps['BEGINNING'] ) ) {
1558                         $this->installSteps = array_merge(
1559                                 $this->extraInstallSteps['BEGINNING'],
1560                                 $this->installSteps
1561                         );
1562                 }
1563
1564                 // Extensions should always go first, chance to tie into hooks and such
1565                 if ( count( $this->getVar( '_Extensions' ) ) ) {
1566                         array_unshift( $this->installSteps,
1567                                 array( 'name' => 'extensions', 'callback' => array( $this, 'includeExtensions' ) )
1568                         );
1569                         $this->installSteps[] = array(
1570                                 'name' => 'extension-tables',
1571                                 'callback' => array( $installer, 'createExtensionTables' )
1572                         );
1573                 }
1574
1575                 return $this->installSteps;
1576         }
1577
1578         /**
1579          * Actually perform the installation.
1580          *
1581          * @param callable $startCB A callback array for the beginning of each step
1582          * @param callable $endCB A callback array for the end of each step
1583          *
1584          * @return array Array of Status objects
1585          */
1586         public function performInstallation( $startCB, $endCB ) {
1587                 $installResults = array();
1588                 $installer = $this->getDBInstaller();
1589                 $installer->preInstall();
1590                 $steps = $this->getInstallSteps( $installer );
1591                 foreach ( $steps as $stepObj ) {
1592                         $name = $stepObj['name'];
1593                         call_user_func_array( $startCB, array( $name ) );
1594
1595                         // Perform the callback step
1596                         $status = call_user_func( $stepObj['callback'], $installer );
1597
1598                         // Output and save the results
1599                         call_user_func( $endCB, $name, $status );
1600                         $installResults[$name] = $status;
1601
1602                         // If we've hit some sort of fatal, we need to bail.
1603                         // Callback already had a chance to do output above.
1604                         if ( !$status->isOk() ) {
1605                                 break;
1606                         }
1607                 }
1608                 if ( $status->isOk() ) {
1609                         $this->setVar( '_InstallDone', true );
1610                 }
1611
1612                 return $installResults;
1613         }
1614
1615         /**
1616          * Generate $wgSecretKey. Will warn if we had to use an insecure random source.
1617          *
1618          * @return Status
1619          */
1620         public function generateKeys() {
1621                 $keys = array( 'wgSecretKey' => 64 );
1622                 if ( strval( $this->getVar( 'wgUpgradeKey' ) ) === '' ) {
1623                         $keys['wgUpgradeKey'] = 16;
1624                 }
1625
1626                 return $this->doGenerateKeys( $keys );
1627         }
1628
1629         /**
1630          * Generate a secret value for variables using our CryptRand generator.
1631          * Produce a warning if the random source was insecure.
1632          *
1633          * @param array $keys
1634          * @return Status
1635          */
1636         protected function doGenerateKeys( $keys ) {
1637                 $status = Status::newGood();
1638
1639                 $strong = true;
1640                 foreach ( $keys as $name => $length ) {
1641                         $secretKey = MWCryptRand::generateHex( $length, true );
1642                         if ( !MWCryptRand::wasStrong() ) {
1643                                 $strong = false;
1644                         }
1645
1646                         $this->setVar( $name, $secretKey );
1647                 }
1648
1649                 if ( !$strong ) {
1650                         $names = array_keys( $keys );
1651                         $names = preg_replace( '/^(.*)$/', '\$$1', $names );
1652                         global $wgLang;
1653                         $status->warning( 'config-insecure-keys', $wgLang->listToText( $names ), count( $names ) );
1654                 }
1655
1656                 return $status;
1657         }
1658
1659         /**
1660          * Create the first user account, grant it sysop and bureaucrat rights
1661          *
1662          * @return Status
1663          */
1664         protected function createSysop() {
1665                 $name = $this->getVar( '_AdminName' );
1666                 $user = User::newFromName( $name );
1667
1668                 if ( !$user ) {
1669                         // We should've validated this earlier anyway!
1670                         return Status::newFatal( 'config-admin-error-user', $name );
1671                 }
1672
1673                 if ( $user->idForName() == 0 ) {
1674                         $user->addToDatabase();
1675
1676                         try {
1677                                 $user->setPassword( $this->getVar( '_AdminPassword' ) );
1678                         } catch ( PasswordError $pwe ) {
1679                                 return Status::newFatal( 'config-admin-error-password', $name, $pwe->getMessage() );
1680                         }
1681
1682                         $user->addGroup( 'sysop' );
1683                         $user->addGroup( 'bureaucrat' );
1684                         if ( $this->getVar( '_AdminEmail' ) ) {
1685                                 $user->setEmail( $this->getVar( '_AdminEmail' ) );
1686                         }
1687                         $user->saveSettings();
1688
1689                         // Update user count
1690                         $ssUpdate = new SiteStatsUpdate( 0, 0, 0, 0, 1 );
1691                         $ssUpdate->doUpdate();
1692                 }
1693                 $status = Status::newGood();
1694
1695                 if ( $this->getVar( '_Subscribe' ) && $this->getVar( '_AdminEmail' ) ) {
1696                         $this->subscribeToMediaWikiAnnounce( $status );
1697                 }
1698
1699                 return $status;
1700         }
1701
1702         /**
1703          * @param Status $s
1704          */
1705         private function subscribeToMediaWikiAnnounce( Status $s ) {
1706                 $params = array(
1707                         'email' => $this->getVar( '_AdminEmail' ),
1708                         'language' => 'en',
1709                         'digest' => 0
1710                 );
1711
1712                 // Mailman doesn't support as many languages as we do, so check to make
1713                 // sure their selected language is available
1714                 $myLang = $this->getVar( '_UserLang' );
1715                 if ( in_array( $myLang, $this->mediaWikiAnnounceLanguages ) ) {
1716                         $myLang = $myLang == 'pt-br' ? 'pt_BR' : $myLang; // rewrite to Mailman's pt_BR
1717                         $params['language'] = $myLang;
1718                 }
1719
1720                 if ( MWHttpRequest::canMakeRequests() ) {
1721                         $res = MWHttpRequest::factory( $this->mediaWikiAnnounceUrl,
1722                                 array( 'method' => 'POST', 'postData' => $params ), __METHOD__ )->execute();
1723                         if ( !$res->isOK() ) {
1724                                 $s->warning( 'config-install-subscribe-fail', $res->getMessage() );
1725                         }
1726                 } else {
1727                         $s->warning( 'config-install-subscribe-notpossible' );
1728                 }
1729         }
1730
1731         /**
1732          * Insert Main Page with default content.
1733          *
1734          * @param DatabaseInstaller $installer
1735          * @return Status
1736          */
1737         protected function createMainpage( DatabaseInstaller $installer ) {
1738                 $status = Status::newGood();
1739                 try {
1740                         $page = WikiPage::factory( Title::newMainPage() );
1741                         $content = new WikitextContent(
1742                                 wfMessage( 'mainpagetext' )->inContentLanguage()->text() . "\n\n" .
1743                                 wfMessage( 'mainpagedocfooter' )->inContentLanguage()->text()
1744                         );
1745
1746                         $page->doEditContent( $content,
1747                                 '',
1748                                 EDIT_NEW,
1749                                 false,
1750                                 User::newFromName( 'MediaWiki default' )
1751                         );
1752                 } catch ( Exception $e ) {
1753                         // using raw, because $wgShowExceptionDetails can not be set yet
1754                         $status->fatal( 'config-install-mainpage-failed', $e->getMessage() );
1755                 }
1756
1757                 return $status;
1758         }
1759
1760         /**
1761          * Override the necessary bits of the config to run an installation.
1762          */
1763         public static function overrideConfig() {
1764                 define( 'MW_NO_SESSION', 1 );
1765
1766                 // Don't access the database
1767                 $GLOBALS['wgUseDatabaseMessages'] = false;
1768                 // Don't cache langconv tables
1769                 $GLOBALS['wgLanguageConverterCacheType'] = CACHE_NONE;
1770                 // Debug-friendly
1771                 $GLOBALS['wgShowExceptionDetails'] = true;
1772                 // Don't break forms
1773                 $GLOBALS['wgExternalLinkTarget'] = '_blank';
1774
1775                 // Extended debugging
1776                 $GLOBALS['wgShowSQLErrors'] = true;
1777                 $GLOBALS['wgShowDBErrorBacktrace'] = true;
1778
1779                 // Allow multiple ob_flush() calls
1780                 $GLOBALS['wgDisableOutputCompression'] = true;
1781
1782                 // Use a sensible cookie prefix (not my_wiki)
1783                 $GLOBALS['wgCookiePrefix'] = 'mw_installer';
1784
1785                 // Some of the environment checks make shell requests, remove limits
1786                 $GLOBALS['wgMaxShellMemory'] = 0;
1787         }
1788
1789         /**
1790          * Add an installation step following the given step.
1791          *
1792          * @param callable $callback A valid installation callback array, in this form:
1793          *    array( 'name' => 'some-unique-name', 'callback' => array( $obj, 'function' ) );
1794          * @param string $findStep The step to find. Omit to put the step at the beginning
1795          */
1796         public function addInstallStep( $callback, $findStep = 'BEGINNING' ) {
1797                 $this->extraInstallSteps[$findStep][] = $callback;
1798         }
1799
1800         /**
1801          * Disable the time limit for execution.
1802          * Some long-running pages (Install, Upgrade) will want to do this
1803          */
1804         protected function disableTimeLimit() {
1805                 MediaWiki\suppressWarnings();
1806                 set_time_limit( 0 );
1807                 MediaWiki\restoreWarnings();
1808         }
1809 }