includes/installer/Installer.php

   1 <?php
   2 /**
   3  * Base code for MediaWiki installer.
   4  *
   5  * DO NOT PATCH THIS FILE IF YOU NEED TO CHANGE INSTALLER BEHAVIOR IN YOUR PACKAGE!
   6  * See mw-config/overrides/README for details.
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License along
  19  * with this program; if not, write to the Free Software Foundation, Inc.,
  20  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  21  * http://www.gnu.org/copyleft/gpl.html
  22  *
  23  * @file
  24  * @ingroup Deployment
  25  */
  26 use MediaWiki\MediaWikiServices;
  27 use MediaWiki\Shell\Shell;
  28
  29 /**
  30  * This documentation group collects source code files with deployment functionality.
  31  *
  32  * @defgroup Deployment Deployment
  33  */
  34
  35 /**
  36  * Base installer class.
  37  *
  38  * This class provides the base for installation and update functionality
  39  * for both MediaWiki core and extensions.
  40  *
  41  * @ingroup Deployment
  42  * @since 1.17
  43  */
  44 abstract class Installer {
  45
  46         /**
  47          * The oldest version of PCRE we can support.
  48          *
  49          * Defining this is necessary because PHP may be linked with a system version
  50          * of PCRE, which may be older than that bundled with the minimum PHP version.
  51          */
  52         const MINIMUM_PCRE_VERSION = '7.2';
  53
  54         /**
  55          * @var array
  56          */
  57         protected $settings;
  58
  59         /**
  60          * List of detected DBs, access using getCompiledDBs().
  61          *
  62          * @var array
  63          */
  64         protected $compiledDBs;
  65
  66         /**
  67          * Cached DB installer instances, access using getDBInstaller().
  68          *
  69          * @var array
  70          */
  71         protected $dbInstallers = [];
  72
  73         /**
  74          * Minimum memory size in MB.
  75          *
  76          * @var int
  77          */
  78         protected $minMemorySize = 50;
  79
  80         /**
  81          * Cached Title, used by parse().
  82          *
  83          * @var Title
  84          */
  85         protected $parserTitle;
  86
  87         /**
  88          * Cached ParserOptions, used by parse().
  89          *
  90          * @var ParserOptions
  91          */
  92         protected $parserOptions;
  93
  94         /**
  95          * Known database types. These correspond to the class names <type>Installer,
  96          * and are also MediaWiki database types valid for $wgDBtype.
  97          *
  98          * To add a new type, create a <type>Installer class and a Database<type>
  99          * class, and add a config-type-<type> message to MessagesEn.php.
 100          *
 101          * @var array
 102          */
 103         protected static $dbTypes = [
 104                 'mysql',
 105                 'postgres',
 106                 'oracle',
 107                 'mssql',
 108                 'sqlite',
 109         ];
 110
 111         /**
 112          * A list of environment check methods called by doEnvironmentChecks().
 113          * These may output warnings using showMessage(), and/or abort the
 114          * installation process by returning false.
 115          *
 116          * For the WebInstaller these are only called on the Welcome page,
 117          * if these methods have side-effects that should affect later page loads
 118          * (as well as the generated stylesheet), use envPreps instead.
 119          *
 120          * @var array
 121          */
 122         protected $envChecks = [
 123                 'envCheckDB',
 124                 'envCheckBrokenXML',
 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                 'envCheck64Bit',
 139         ];
 140
 141         /**
 142          * A list of environment preparation methods called by doEnvironmentPreps().
 143          *
 144          * @var array
 145          */
 146         protected $envPreps = [
 147                 'envPrepServer',
 148                 'envPrepPath',
 149         ];
 150
 151         /**
 152          * MediaWiki configuration globals that will eventually be passed through
 153          * to LocalSettings.php. The names only are given here, the defaults
 154          * typically come from DefaultSettings.php.
 155          *
 156          * @var array
 157          */
 158         protected $defaultVarNames = [
 159                 'wgSitename',
 160                 'wgPasswordSender',
 161                 'wgLanguageCode',
 162                 'wgRightsIcon',
 163                 'wgRightsText',
 164                 'wgRightsUrl',
 165                 'wgEnableEmail',
 166                 'wgEnableUserEmail',
 167                 'wgEnotifUserTalk',
 168                 'wgEnotifWatchlist',
 169                 'wgEmailAuthentication',
 170                 'wgDBname',
 171                 'wgDBtype',
 172                 'wgDiff3',
 173                 'wgImageMagickConvertCommand',
 174                 'wgGitBin',
 175                 'IP',
 176                 'wgScriptPath',
 177                 'wgMetaNamespace',
 178                 'wgDeletedDirectory',
 179                 'wgEnableUploads',
 180                 'wgShellLocale',
 181                 'wgSecretKey',
 182                 'wgUseInstantCommons',
 183                 'wgUpgradeKey',
 184                 'wgDefaultSkin',
 185                 'wgPingback',
 186         ];
 187
 188         /**
 189          * Variables that are stored alongside globals, and are used for any
 190          * configuration of the installation process aside from the MediaWiki
 191          * configuration. Map of names to defaults.
 192          *
 193          * @var array
 194          */
 195         protected $internalDefaults = [
 196                 '_UserLang' => 'en',
 197                 '_Environment' => false,
 198                 '_RaiseMemory' => false,
 199                 '_UpgradeDone' => false,
 200                 '_InstallDone' => false,
 201                 '_Caches' => [],
 202                 '_InstallPassword' => '',
 203                 '_SameAccount' => true,
 204                 '_CreateDBAccount' => false,
 205                 '_NamespaceType' => 'site-name',
 206                 '_AdminName' => '', // will be set later, when the user selects language
 207                 '_AdminPassword' => '',
 208                 '_AdminPasswordConfirm' => '',
 209                 '_AdminEmail' => '',
 210                 '_Subscribe' => false,
 211                 '_SkipOptional' => 'continue',
 212                 '_RightsProfile' => 'wiki',
 213                 '_LicenseCode' => 'none',
 214                 '_CCDone' => false,
 215                 '_Extensions' => [],
 216                 '_Skins' => [],
 217                 '_MemCachedServers' => '',
 218                 '_UpgradeKeySupplied' => false,
 219                 '_ExistingDBSettings' => false,
 220
 221                 // $wgLogo is probably wrong (T50084); set something that will work.
 222                 // Single quotes work fine here, as LocalSettingsGenerator outputs this unescaped.
 223                 'wgLogo' => '$wgResourceBasePath/resources/assets/wiki.png',
 224                 'wgAuthenticationTokenVersion' => 1,
 225         ];
 226
 227         /**
 228          * The actual list of installation steps. This will be initialized by getInstallSteps()
 229          *
 230          * @var array
 231          */
 232         private $installSteps = [];
 233
 234         /**
 235          * Extra steps for installation, for things like DatabaseInstallers to modify
 236          *
 237          * @var array
 238          */
 239         protected $extraInstallSteps = [];
 240
 241         /**
 242          * Known object cache types and the functions used to test for their existence.
 243          *
 244          * @var array
 245          */
 246         protected $objectCaches = [
 247                 'apc' => 'apc_fetch',
 248                 'apcu' => 'apcu_fetch',
 249                 'wincache' => 'wincache_ucache_get'
 250         ];
 251
 252         /**
 253          * User rights profiles.
 254          *
 255          * @var array
 256          */
 257         public $rightsProfiles = [
 258                 'wiki' => [],
 259                 'no-anon' => [
 260                         '*' => [ 'edit' => false ]
 261                 ],
 262                 'fishbowl' => [
 263                         '*' => [
 264                                 'createaccount' => false,
 265                                 'edit' => false,
 266                         ],
 267                 ],
 268                 'private' => [
 269                         '*' => [
 270                                 'createaccount' => false,
 271                                 'edit' => false,
 272                                 'read' => false,
 273                         ],
 274                 ],
 275         ];
 276
 277         /**
 278          * License types.
 279          *
 280          * @var array
 281          */
 282         public $licenses = [
 283                 'cc-by' => [
 284                         'url' => 'https://creativecommons.org/licenses/by/4.0/',
 285                         'icon' => '$wgResourceBasePath/resources/assets/licenses/cc-by.png',
 286                 ],
 287                 'cc-by-sa' => [
 288                         'url' => 'https://creativecommons.org/licenses/by-sa/4.0/',
 289                         'icon' => '$wgResourceBasePath/resources/assets/licenses/cc-by-sa.png',
 290                 ],
 291                 'cc-by-nc-sa' => [
 292                         'url' => 'https://creativecommons.org/licenses/by-nc-sa/4.0/',
 293                         'icon' => '$wgResourceBasePath/resources/assets/licenses/cc-by-nc-sa.png',
 294                 ],
 295                 'cc-0' => [
 296                         'url' => 'https://creativecommons.org/publicdomain/zero/1.0/',
 297                         'icon' => '$wgResourceBasePath/resources/assets/licenses/cc-0.png',
 298                 ],
 299                 'gfdl' => [
 300                         'url' => 'https://www.gnu.org/copyleft/fdl.html',
 301                         'icon' => '$wgResourceBasePath/resources/assets/licenses/gnu-fdl.png',
 302                 ],
 303                 'none' => [
 304                         'url' => '',
 305                         'icon' => '',
 306                         'text' => ''
 307                 ],
 308                 'cc-choose' => [
 309                         // Details will be filled in by the selector.
 310                         'url' => '',
 311                         'icon' => '',
 312                         'text' => '',
 313                 ],
 314         ];
 315
 316         /**
 317          * URL to mediawiki-announce subscription
 318          */
 319         protected $mediaWikiAnnounceUrl =
 320                 'https://lists.wikimedia.org/mailman/subscribe/mediawiki-announce';
 321
 322         /**
 323          * Supported language codes for Mailman
 324          */
 325         protected $mediaWikiAnnounceLanguages = [
 326                 'ca', 'cs', 'da', 'de', 'en', 'es', 'et', 'eu', 'fi', 'fr', 'hr', 'hu',
 327                 'it', 'ja', 'ko', 'lt', 'nl', 'no', 'pl', 'pt', 'pt-br', 'ro', 'ru',
 328                 'sl', 'sr', 'sv', 'tr', 'uk'
 329         ];
 330
 331         /**
 332          * UI interface for displaying a short message
 333          * The parameters are like parameters to wfMessage().
 334          * The messages will be in wikitext format, which will be converted to an
 335          * output format such as HTML or text before being sent to the user.
 336          * @param string $msg
 337          */
 338         abstract public function showMessage( $msg /*, ... */ );
 339
 340         /**
 341          * Same as showMessage(), but for displaying errors
 342          * @param string $msg
 343          */
 344         abstract public function showError( $msg /*, ... */ );
 345
 346         /**
 347          * Show a message to the installing user by using a Status object
 348          * @param Status $status
 349          */
 350         abstract public function showStatusMessage( Status $status );
 351
 352         /**
 353          * Constructs a Config object that contains configuration settings that should be
 354          * overwritten for the installation process.
 355          *
 356          * @since 1.27
 357          *
 358          * @param Config $baseConfig
 359          *
 360          * @return Config The config to use during installation.
 361          */
 362         public static function getInstallerConfig( Config $baseConfig ) {
 363                 $configOverrides = new HashConfig();
 364
 365                 // disable (problematic) object cache types explicitly, preserving all other (working) ones
 366                 // bug T113843
 367                 $emptyCache = [ 'class' => EmptyBagOStuff::class ];
 368
 369                 $objectCaches = [
 370                                 CACHE_NONE => $emptyCache,
 371                                 CACHE_DB => $emptyCache,
 372                                 CACHE_ANYTHING => $emptyCache,
 373                                 CACHE_MEMCACHED => $emptyCache,
 374                         ] + $baseConfig->get( 'ObjectCaches' );
 375
 376                 $configOverrides->set( 'ObjectCaches', $objectCaches );
 377
 378                 // Load the installer's i18n.
 379                 $messageDirs = $baseConfig->get( 'MessagesDirs' );
 380                 $messageDirs['MediawikiInstaller'] = __DIR__ . '/i18n';
 381
 382                 $configOverrides->set( 'MessagesDirs', $messageDirs );
 383
 384                 $installerConfig = new MultiConfig( [ $configOverrides, $baseConfig ] );
 385
 386                 // make sure we use the installer config as the main config
 387                 $configRegistry = $baseConfig->get( 'ConfigRegistry' );
 388                 $configRegistry['main'] = function () use ( $installerConfig ) {
 389                         return $installerConfig;
 390                 };
 391
 392                 $configOverrides->set( 'ConfigRegistry', $configRegistry );
 393
 394                 return $installerConfig;
 395         }
 396
 397         /**
 398          * Constructor, always call this from child classes.
 399          */
 400         public function __construct() {
 401                 global $wgMemc, $wgUser, $wgObjectCaches;
 402
 403                 $defaultConfig = new GlobalVarConfig(); // all the stuff from DefaultSettings.php
 404                 $installerConfig = self::getInstallerConfig( $defaultConfig );
 405
 406                 // Reset all services and inject config overrides
 407                 MediaWiki\MediaWikiServices::resetGlobalInstance( $installerConfig );
 408
 409                 // Don't attempt to load user language options (T126177)
 410                 // This will be overridden in the web installer with the user-specified language
 411                 RequestContext::getMain()->setLanguage( 'en' );
 412
 413                 // Disable the i18n cache
 414                 // TODO: manage LocalisationCache singleton in MediaWikiServices
 415                 Language::getLocalisationCache()->disableBackend();
 416
 417                 // Disable all global services, since we don't have any configuration yet!
 418                 MediaWiki\MediaWikiServices::disableStorageBackend();
 419
 420                 // Disable object cache (otherwise CACHE_ANYTHING will try CACHE_DB and
 421                 // SqlBagOStuff will then throw since we just disabled wfGetDB)
 422                 $wgObjectCaches = MediaWikiServices::getInstance()->getMainConfig()->get( 'ObjectCaches' );
 423                 $wgMemc = ObjectCache::getInstance( CACHE_NONE );
 424
 425                 // Having a user with id = 0 safeguards us from DB access via User::loadOptions().
 426                 $wgUser = User::newFromId( 0 );
 427                 RequestContext::getMain()->setUser( $wgUser );
 428
 429                 $this->settings = $this->internalDefaults;
 430
 431                 foreach ( $this->defaultVarNames as $var ) {
 432                         $this->settings[$var] = $GLOBALS[$var];
 433                 }
 434
 435                 $this->doEnvironmentPreps();
 436
 437                 $this->compiledDBs = [];
 438                 foreach ( self::getDBTypes() as $type ) {
 439                         $installer = $this->getDBInstaller( $type );
 440
 441                         if ( !$installer->isCompiled() ) {
 442                                 continue;
 443                         }
 444                         $this->compiledDBs[] = $type;
 445                 }
 446
 447                 $this->parserTitle = Title::newFromText( 'Installer' );
 448                 $this->parserOptions = new ParserOptions( $wgUser ); // language will be wrong :(
 449                 // Don't try to access DB before user language is initialised
 450                 $this->setParserLanguage( Language::factory( 'en' ) );
 451         }
 452
 453         /**
 454          * Get a list of known DB types.
 455          *
 456          * @return array
 457          */
 458         public static function getDBTypes() {
 459                 return self::$dbTypes;
 460         }
 461
 462         /**
 463          * Do initial checks of the PHP environment. Set variables according to
 464          * the observed environment.
 465          *
 466          * It's possible that this may be called under the CLI SAPI, not the SAPI
 467          * that the wiki will primarily run under. In that case, the subclass should
 468          * initialise variables such as wgScriptPath, before calling this function.
 469          *
 470          * Under the web subclass, it can already be assumed that PHP 5+ is in use
 471          * and that sessions are working.
 472          *
 473          * @return Status
 474          */
 475         public function doEnvironmentChecks() {
 476                 // Php version has already been checked by entry scripts
 477                 // Show message here for information purposes
 478                 if ( wfIsHHVM() ) {
 479                         $this->showMessage( 'config-env-hhvm', HHVM_VERSION );
 480                 } else {
 481                         $this->showMessage( 'config-env-php', PHP_VERSION );
 482                 }
 483
 484                 $good = true;
 485                 // Must go here because an old version of PCRE can prevent other checks from completing
 486                 list( $pcreVersion ) = explode( ' ', PCRE_VERSION, 2 );
 487                 if ( version_compare( $pcreVersion, self::MINIMUM_PCRE_VERSION, '<' ) ) {
 488                         $this->showError( 'config-pcre-old', self::MINIMUM_PCRE_VERSION, $pcreVersion );
 489                         $good = false;
 490                 } else {
 491                         foreach ( $this->envChecks as $check ) {
 492                                 $status = $this->$check();
 493                                 if ( $status === false ) {
 494                                         $good = false;
 495                                 }
 496                         }
 497                 }
 498
 499                 $this->setVar( '_Environment', $good );
 500
 501                 return $good ? Status::newGood() : Status::newFatal( 'config-env-bad' );
 502         }
 503
 504         public function doEnvironmentPreps() {
 505                 foreach ( $this->envPreps as $prep ) {
 506                         $this->$prep();
 507                 }
 508         }
 509
 510         /**
 511          * Set a MW configuration variable, or internal installer configuration variable.
 512          *
 513          * @param string $name
 514          * @param mixed $value
 515          */
 516         public function setVar( $name, $value ) {
 517                 $this->settings[$name] = $value;
 518         }
 519
 520         /**
 521          * Get an MW configuration variable, or internal installer configuration variable.
 522          * The defaults come from $GLOBALS (ultimately DefaultSettings.php).
 523          * Installer variables are typically prefixed by an underscore.
 524          *
 525          * @param string $name
 526          * @param mixed $default
 527          *
 528          * @return mixed
 529          */
 530         public function getVar( $name, $default = null ) {
 531                 if ( !isset( $this->settings[$name] ) ) {
 532                         return $default;
 533                 } else {
 534                         return $this->settings[$name];
 535                 }
 536         }
 537
 538         /**
 539          * Get a list of DBs supported by current PHP setup
 540          *
 541          * @return array
 542          */
 543         public function getCompiledDBs() {
 544                 return $this->compiledDBs;
 545         }
 546
 547         /**
 548          * Get the DatabaseInstaller class name for this type
 549          *
 550          * @param string $type database type ($wgDBtype)
 551          * @return string Class name
 552          * @since 1.30
 553          */
 554         public static function getDBInstallerClass( $type ) {
 555                 return ucfirst( $type ) . 'Installer';
 556         }
 557
 558         /**
 559          * Get an instance of DatabaseInstaller for the specified DB type.
 560          *
 561          * @param mixed $type DB installer for which is needed, false to use default.
 562          *
 563          * @return DatabaseInstaller
 564          */
 565         public function getDBInstaller( $type = false ) {
 566                 if ( !$type ) {
 567                         $type = $this->getVar( 'wgDBtype' );
 568                 }
 569
 570                 $type = strtolower( $type );
 571
 572                 if ( !isset( $this->dbInstallers[$type] ) ) {
 573                         $class = self::getDBInstallerClass( $type );
 574                         $this->dbInstallers[$type] = new $class( $this );
 575                 }
 576
 577                 return $this->dbInstallers[$type];
 578         }
 579
 580         /**
 581          * Determine if LocalSettings.php exists. If it does, return its variables.
 582          *
 583          * @return array|false
 584          */
 585         public static function getExistingLocalSettings() {
 586                 global $IP;
 587
 588                 // You might be wondering why this is here. Well if you don't do this
 589                 // then some poorly-formed extensions try to call their own classes
 590                 // after immediately registering them. We really need to get extension
 591                 // registration out of the global scope and into a real format.
 592                 // @see https://phabricator.wikimedia.org/T69440
 593                 global $wgAutoloadClasses;
 594                 $wgAutoloadClasses = [];
 595
 596                 // LocalSettings.php should not call functions, except wfLoadSkin/wfLoadExtensions
 597                 // Define the required globals here, to ensure, the functions can do it work correctly.
 598                 // phpcs:ignore MediaWiki.VariableAnalysis.UnusedGlobalVariables
 599                 global $wgExtensionDirectory, $wgStyleDirectory;
 600
 601                 Wikimedia\suppressWarnings();
 602                 $_lsExists = file_exists( "$IP/LocalSettings.php" );
 603                 Wikimedia\restoreWarnings();
 604
 605                 if ( !$_lsExists ) {
 606                         return false;
 607                 }
 608                 unset( $_lsExists );
 609
 610                 require "$IP/includes/DefaultSettings.php";
 611                 require "$IP/LocalSettings.php";
 612
 613                 return get_defined_vars();
 614         }
 615
 616         /**
 617          * Get a fake password for sending back to the user in HTML.
 618          * This is a security mechanism to avoid compromise of the password in the
 619          * event of session ID compromise.
 620          *
 621          * @param string $realPassword
 622          *
 623          * @return string
 624          */
 625         public function getFakePassword( $realPassword ) {
 626                 return str_repeat( '*', strlen( $realPassword ) );
 627         }
 628
 629         /**
 630          * Set a variable which stores a password, except if the new value is a
 631          * fake password in which case leave it as it is.
 632          *
 633          * @param string $name
 634          * @param mixed $value
 635          */
 636         public function setPassword( $name, $value ) {
 637                 if ( !preg_match( '/^\*+$/', $value ) ) {
 638                         $this->setVar( $name, $value );
 639                 }
 640         }
 641
 642         /**
 643          * On POSIX systems return the primary group of the webserver we're running under.
 644          * On other systems just returns null.
 645          *
 646          * This is used to advice the user that he should chgrp his mw-config/data/images directory as the
 647          * webserver user before he can install.
 648          *
 649          * Public because SqliteInstaller needs it, and doesn't subclass Installer.
 650          *
 651          * @return mixed
 652          */
 653         public static function maybeGetWebserverPrimaryGroup() {
 654                 if ( !function_exists( 'posix_getegid' ) || !function_exists( 'posix_getpwuid' ) ) {
 655                         # I don't know this, this isn't UNIX.
 656                         return null;
 657                 }
 658
 659                 # posix_getegid() *not* getmygid() because we want the group of the webserver,
 660                 # not whoever owns the current script.
 661                 $gid = posix_getegid();
 662                 $group = posix_getpwuid( $gid )['name'];
 663
 664                 return $group;
 665         }
 666
 667         /**
 668          * Convert wikitext $text to HTML.
 669          *
 670          * This is potentially error prone since many parser features require a complete
 671          * installed MW database. The solution is to just not use those features when you
 672          * write your messages. This appears to work well enough. Basic formatting and
 673          * external links work just fine.
 674          *
 675          * But in case a translator decides to throw in a "#ifexist" or internal link or
 676          * whatever, this function is guarded to catch the attempted DB access and to present
 677          * some fallback text.
 678          *
 679          * @param string $text
 680          * @param bool $lineStart
 681          * @return string
 682          */
 683         public function parse( $text, $lineStart = false ) {
 684                 global $wgParser;
 685
 686                 try {
 687                         $out = $wgParser->parse( $text, $this->parserTitle, $this->parserOptions, $lineStart );
 688                         $html = $out->getText( [
 689                                 'enableSectionEditLinks' => false,
 690                                 'unwrap' => true,
 691                         ] );
 692                 } catch ( MediaWiki\Services\ServiceDisabledException $e ) {
 693                         $html = '<!--DB access attempted during parse-->  ' . htmlspecialchars( $text );
 694                 }
 695
 696                 return $html;
 697         }
 698
 699         /**
 700          * @return ParserOptions
 701          */
 702         public function getParserOptions() {
 703                 return $this->parserOptions;
 704         }
 705
 706         public function disableLinkPopups() {
 707                 $this->parserOptions->setExternalLinkTarget( false );
 708         }
 709
 710         public function restoreLinkPopups() {
 711                 global $wgExternalLinkTarget;
 712                 $this->parserOptions->setExternalLinkTarget( $wgExternalLinkTarget );
 713         }
 714
 715         /**
 716          * Install step which adds a row to the site_stats table with appropriate
 717          * initial values.
 718          *
 719          * @param DatabaseInstaller $installer
 720          *
 721          * @return Status
 722          */
 723         public function populateSiteStats( DatabaseInstaller $installer ) {
 724                 $status = $installer->getConnection();
 725                 if ( !$status->isOK() ) {
 726                         return $status;
 727                 }
 728                 $status->value->insert(
 729                         'site_stats',
 730                         [
 731                                 'ss_row_id' => 1,
 732                                 'ss_total_edits' => 0,
 733                                 'ss_good_articles' => 0,
 734                                 'ss_total_pages' => 0,
 735                                 'ss_users' => 0,
 736                                 'ss_active_users' => 0,
 737                                 'ss_images' => 0
 738                         ],
 739                         __METHOD__, 'IGNORE'
 740                 );
 741
 742                 return Status::newGood();
 743         }
 744
 745         /**
 746          * Environment check for DB types.
 747          * @return bool
 748          */
 749         protected function envCheckDB() {
 750                 global $wgLang;
 751
 752                 $allNames = [];
 753
 754                 // Messages: config-type-mysql, config-type-postgres, config-type-oracle,
 755                 // config-type-sqlite
 756                 foreach ( self::getDBTypes() as $name ) {
 757                         $allNames[] = wfMessage( "config-type-$name" )->text();
 758                 }
 759
 760                 $databases = $this->getCompiledDBs();
 761
 762                 $databases = array_flip( $databases );
 763                 foreach ( array_keys( $databases ) as $db ) {
 764                         $installer = $this->getDBInstaller( $db );
 765                         $status = $installer->checkPrerequisites();
 766                         if ( !$status->isGood() ) {
 767                                 $this->showStatusMessage( $status );
 768                         }
 769                         if ( !$status->isOK() ) {
 770                                 unset( $databases[$db] );
 771                         }
 772                 }
 773                 $databases = array_flip( $databases );
 774                 if ( !$databases ) {
 775                         $this->showError( 'config-no-db', $wgLang->commaList( $allNames ), count( $allNames ) );
 776
 777                         // @todo FIXME: This only works for the web installer!
 778                         return false;
 779                 }
 780
 781                 return true;
 782         }
 783
 784         /**
 785          * Some versions of libxml+PHP break < and > encoding horribly
 786          * @return bool
 787          */
 788         protected function envCheckBrokenXML() {
 789                 $test = new PhpXmlBugTester();
 790                 if ( !$test->ok ) {
 791                         $this->showError( 'config-brokenlibxml' );
 792
 793                         return false;
 794                 }
 795
 796                 return true;
 797         }
 798
 799         /**
 800          * Environment check for the PCRE module.
 801          *
 802          * @note If this check were to fail, the parser would
 803          *   probably throw an exception before the result
 804          *   of this check is shown to the user.
 805          * @return bool
 806          */
 807         protected function envCheckPCRE() {
 808                 Wikimedia\suppressWarnings();
 809                 $regexd = preg_replace( '/[\x{0430}-\x{04FF}]/iu', '', '-АБВГД-' );
 810                 // Need to check for \p support too, as PCRE can be compiled
 811                 // with utf8 support, but not unicode property support.
 812                 // check that \p{Zs} (space separators) matches
 813                 // U+3000 (Ideographic space)
 814                 $regexprop = preg_replace( '/\p{Zs}/u', '', "-\u{3000}-" );
 815                 Wikimedia\restoreWarnings();
 816                 if ( $regexd != '--' || $regexprop != '--' ) {
 817                         $this->showError( 'config-pcre-no-utf8' );
 818
 819                         return false;
 820                 }
 821
 822                 return true;
 823         }
 824
 825         /**
 826          * Environment check for available memory.
 827          * @return bool
 828          */
 829         protected function envCheckMemory() {
 830                 $limit = ini_get( 'memory_limit' );
 831
 832                 if ( !$limit || $limit == -1 ) {
 833                         return true;
 834                 }
 835
 836                 $n = wfShorthandToInteger( $limit );
 837
 838                 if ( $n < $this->minMemorySize * 1024 * 1024 ) {
 839                         $newLimit = "{$this->minMemorySize}M";
 840
 841                         if ( ini_set( "memory_limit", $newLimit ) === false ) {
 842                                 $this->showMessage( 'config-memory-bad', $limit );
 843                         } else {
 844                                 $this->showMessage( 'config-memory-raised', $limit, $newLimit );
 845                                 $this->setVar( '_RaiseMemory', true );
 846                         }
 847                 }
 848
 849                 return true;
 850         }
 851
 852         /**
 853          * Environment check for compiled object cache types.
 854          */
 855         protected function envCheckCache() {
 856                 $caches = [];
 857                 foreach ( $this->objectCaches as $name => $function ) {
 858                         if ( function_exists( $function ) ) {
 859                                 $caches[$name] = true;
 860                         }
 861                 }
 862
 863                 if ( !$caches ) {
 864                         $key = 'config-no-cache-apcu';
 865                         $this->showMessage( $key );
 866                 }
 867
 868                 $this->setVar( '_Caches', $caches );
 869         }
 870
 871         /**
 872          * Scare user to death if they have mod_security or mod_security2
 873          * @return bool
 874          */
 875         protected function envCheckModSecurity() {
 876                 if ( self::apacheModulePresent( 'mod_security' )
 877                         || self::apacheModulePresent( 'mod_security2' ) ) {
 878                         $this->showMessage( 'config-mod-security' );
 879                 }
 880
 881                 return true;
 882         }
 883
 884         /**
 885          * Search for GNU diff3.
 886          * @return bool
 887          */
 888         protected function envCheckDiff3() {
 889                 $names = [ "gdiff3", "diff3" ];
 890                 if ( wfIsWindows() ) {
 891                         $names[] = 'diff3.exe';
 892                 }
 893                 $versionInfo = [ '--version', 'GNU diffutils' ];
 894
 895                 $diff3 = ExecutableFinder::findInDefaultPaths( $names, $versionInfo );
 896
 897                 if ( $diff3 ) {
 898                         $this->setVar( 'wgDiff3', $diff3 );
 899                 } else {
 900                         $this->setVar( 'wgDiff3', false );
 901                         $this->showMessage( 'config-diff3-bad' );
 902                 }
 903
 904                 return true;
 905         }
 906
 907         /**
 908          * Environment check for ImageMagick and GD.
 909          * @return bool
 910          */
 911         protected function envCheckGraphics() {
 912                 $names = wfIsWindows() ? 'convert.exe' : 'convert';
 913                 $versionInfo = [ '-version', 'ImageMagick' ];
 914                 $convert = ExecutableFinder::findInDefaultPaths( $names, $versionInfo );
 915
 916                 $this->setVar( 'wgImageMagickConvertCommand', '' );
 917                 if ( $convert ) {
 918                         $this->setVar( 'wgImageMagickConvertCommand', $convert );
 919                         $this->showMessage( 'config-imagemagick', $convert );
 920
 921                         return true;
 922                 } elseif ( function_exists( 'imagejpeg' ) ) {
 923                         $this->showMessage( 'config-gd' );
 924                 } else {
 925                         $this->showMessage( 'config-no-scaling' );
 926                 }
 927
 928                 return true;
 929         }
 930
 931         /**
 932          * Search for git.
 933          *
 934          * @since 1.22
 935          * @return bool
 936          */
 937         protected function envCheckGit() {
 938                 $names = wfIsWindows() ? 'git.exe' : 'git';
 939                 $versionInfo = [ '--version', 'git version' ];
 940
 941                 $git = ExecutableFinder::findInDefaultPaths( $names, $versionInfo );
 942
 943                 if ( $git ) {
 944                         $this->setVar( 'wgGitBin', $git );
 945                         $this->showMessage( 'config-git', $git );
 946                 } else {
 947                         $this->setVar( 'wgGitBin', false );
 948                         $this->showMessage( 'config-git-bad' );
 949                 }
 950
 951                 return true;
 952         }
 953
 954         /**
 955          * Environment check to inform user which server we've assumed.
 956          *
 957          * @return bool
 958          */
 959         protected function envCheckServer() {
 960                 $server = $this->envGetDefaultServer();
 961                 if ( $server !== null ) {
 962                         $this->showMessage( 'config-using-server', $server );
 963                 }
 964                 return true;
 965         }
 966
 967         /**
 968          * Environment check to inform user which paths we've assumed.
 969          *
 970          * @return bool
 971          */
 972         protected function envCheckPath() {
 973                 $this->showMessage(
 974                         'config-using-uri',
 975                         $this->getVar( 'wgServer' ),
 976                         $this->getVar( 'wgScriptPath' )
 977                 );
 978                 return true;
 979         }
 980
 981         /**
 982          * Environment check for preferred locale in shell
 983          * @return bool
 984          */
 985         protected function envCheckShellLocale() {
 986                 $os = php_uname( 's' );
 987                 $supported = [ 'Linux', 'SunOS', 'HP-UX', 'Darwin' ]; # Tested these
 988
 989                 if ( !in_array( $os, $supported ) ) {
 990                         return true;
 991                 }
 992
 993                 if ( Shell::isDisabled() ) {
 994                         return true;
 995                 }
 996
 997                 # Get a list of available locales.
 998                 $result = Shell::command( '/usr/bin/locale', '-a' )
 999                         ->execute();
1000
1001                 if ( $result->getExitCode() != 0 ) {
1002                         return true;
1003                 }
1004
1005                 $lines = $result->getStdout();
1006                 $lines = array_map( 'trim', explode( "\n", $lines ) );
1007                 $candidatesByLocale = [];
1008                 $candidatesByLang = [];
1009                 foreach ( $lines as $line ) {
1010                         if ( $line === '' ) {
1011                                 continue;
1012                         }
1013
1014                         if ( !preg_match( '/^([a-zA-Z]+)(_[a-zA-Z]+|)\.(utf8|UTF-8)(@[a-zA-Z_]*|)$/i', $line, $m ) ) {
1015                                 continue;
1016                         }
1017
1018                         list( , $lang, , , ) = $m;
1019
1020                         $candidatesByLocale[$m[0]] = $m;
1021                         $candidatesByLang[$lang][] = $m;
1022                 }
1023
1024                 # Try the current value of LANG.
1025                 if ( isset( $candidatesByLocale[getenv( 'LANG' )] ) ) {
1026                         $this->setVar( 'wgShellLocale', getenv( 'LANG' ) );
1027
1028                         return true;
1029                 }
1030
1031                 # Try the most common ones.
1032                 $commonLocales = [ 'C.UTF-8', '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
1037                                 return true;
1038                         }
1039                 }
1040
1041                 # Is there an available locale in the Wiki's language?
1042                 $wikiLang = $this->getVar( 'wgLanguageCode' );
1043
1044                 if ( isset( $candidatesByLang[$wikiLang] ) ) {
1045                         $m = reset( $candidatesByLang[$wikiLang] );
1046                         $this->setVar( 'wgShellLocale', $m[0] );
1047
1048                         return true;
1049                 }
1050
1051                 # Are there any at all?
1052                 if ( count( $candidatesByLocale ) ) {
1053                         $m = reset( $candidatesByLocale );
1054                         $this->setVar( 'wgShellLocale', $m[0] );
1055
1056                         return true;
1057                 }
1058
1059                 # Give up.
1060                 return true;
1061         }
1062
1063         /**
1064          * Environment check for the permissions of the uploads directory
1065          * @return bool
1066          */
1067         protected function envCheckUploadsDirectory() {
1068                 global $IP;
1069
1070                 $dir = $IP . '/images/';
1071                 $url = $this->getVar( 'wgServer' ) . $this->getVar( 'wgScriptPath' ) . '/images/';
1072                 $safe = !$this->dirIsExecutable( $dir, $url );
1073
1074                 if ( !$safe ) {
1075                         $this->showMessage( 'config-uploads-not-safe', $dir );
1076                 }
1077
1078                 return true;
1079         }
1080
1081         /**
1082          * Checks if suhosin.get.max_value_length is set, and if so generate
1083          * a warning because it decreases ResourceLoader performance.
1084          * @return bool
1085          */
1086         protected function envCheckSuhosinMaxValueLength() {
1087                 $maxValueLength = ini_get( 'suhosin.get.max_value_length' );
1088                 if ( $maxValueLength > 0 && $maxValueLength < 1024 ) {
1089                         // Only warn if the value is below the sane 1024
1090                         $this->showMessage( 'config-suhosin-max-value-length', $maxValueLength );
1091                 }
1092
1093                 return true;
1094         }
1095
1096         /**
1097          * Checks if we're running on 64 bit or not. 32 bit is becoming increasingly
1098          * hard to support, so let's at least warn people.
1099          *
1100          * @return bool
1101          */
1102         protected function envCheck64Bit() {
1103                 if ( PHP_INT_SIZE == 4 ) {
1104                         $this->showMessage( 'config-using-32bit' );
1105                 }
1106
1107                 return true;
1108         }
1109
1110         /**
1111          * Check the libicu version
1112          */
1113         protected function envCheckLibicu() {
1114                 /**
1115                  * This needs to be updated something that the latest libicu
1116                  * will properly normalize.  This normalization was found at
1117                  * https://www.unicode.org/versions/Unicode5.2.0/#Character_Additions
1118                  * Note that we use the hex representation to create the code
1119                  * points in order to avoid any Unicode-destroying during transit.
1120                  */
1121                 $not_normal_c = "\u{FA6C}";
1122                 $normal_c = "\u{242EE}";
1123
1124                 $useNormalizer = 'php';
1125                 $needsUpdate = false;
1126
1127                 if ( function_exists( 'normalizer_normalize' ) ) {
1128                         $useNormalizer = 'intl';
1129                         $intl = normalizer_normalize( $not_normal_c, Normalizer::FORM_C );
1130                         if ( $intl !== $normal_c ) {
1131                                 $needsUpdate = true;
1132                         }
1133                 }
1134
1135                 // Uses messages 'config-unicode-using-php' and 'config-unicode-using-intl'
1136                 if ( $useNormalizer === 'php' ) {
1137                         $this->showMessage( 'config-unicode-pure-php-warning' );
1138                 } else {
1139                         $this->showMessage( 'config-unicode-using-' . $useNormalizer );
1140                         if ( $needsUpdate ) {
1141                                 $this->showMessage( 'config-unicode-update-warning' );
1142                         }
1143                 }
1144         }
1145
1146         /**
1147          * Environment prep for the server hostname.
1148          */
1149         protected function envPrepServer() {
1150                 $server = $this->envGetDefaultServer();
1151                 if ( $server !== null ) {
1152                         $this->setVar( 'wgServer', $server );
1153                 }
1154         }
1155
1156         /**
1157          * Helper function to be called from envPrepServer()
1158          * @return string
1159          */
1160         abstract protected function envGetDefaultServer();
1161
1162         /**
1163          * Environment prep for setting $IP and $wgScriptPath.
1164          */
1165         protected function envPrepPath() {
1166                 global $IP;
1167                 $IP = dirname( dirname( __DIR__ ) );
1168                 $this->setVar( 'IP', $IP );
1169         }
1170
1171         /**
1172          * Checks if scripts located in the given directory can be executed via the given URL.
1173          *
1174          * Used only by environment checks.
1175          * @param string $dir
1176          * @param string $url
1177          * @return bool|int|string
1178          */
1179         public function dirIsExecutable( $dir, $url ) {
1180                 $scriptTypes = [
1181                         'php' => [
1182                                 "<?php echo 'ex' . 'ec';",
1183                                 "#!/var/env php\n<?php echo 'ex' . 'ec';",
1184                         ],
1185                 ];
1186
1187                 // it would be good to check other popular languages here, but it'll be slow.
1188
1189                 Wikimedia\suppressWarnings();
1190
1191                 foreach ( $scriptTypes as $ext => $contents ) {
1192                         foreach ( $contents as $source ) {
1193                                 $file = 'exectest.' . $ext;
1194
1195                                 if ( !file_put_contents( $dir . $file, $source ) ) {
1196                                         break;
1197                                 }
1198
1199                                 try {
1200                                         $text = Http::get( $url . $file, [ 'timeout' => 3 ], __METHOD__ );
1201                                 } catch ( Exception $e ) {
1202                                         // Http::get throws with allow_url_fopen = false and no curl extension.
1203                                         $text = null;
1204                                 }
1205                                 unlink( $dir . $file );
1206
1207                                 if ( $text == 'exec' ) {
1208                                         Wikimedia\restoreWarnings();
1209
1210                                         return $ext;
1211                                 }
1212                         }
1213                 }
1214
1215                 Wikimedia\restoreWarnings();
1216
1217                 return false;
1218         }
1219
1220         /**
1221          * Checks for presence of an Apache module. Works only if PHP is running as an Apache module, too.
1222          *
1223          * @param string $moduleName Name of module to check.
1224          * @return bool
1225          */
1226         public static function apacheModulePresent( $moduleName ) {
1227                 if ( function_exists( 'apache_get_modules' ) && in_array( $moduleName, apache_get_modules() ) ) {
1228                         return true;
1229                 }
1230                 // try it the hard way
1231                 ob_start();
1232                 phpinfo( INFO_MODULES );
1233                 $info = ob_get_clean();
1234
1235                 return strpos( $info, $moduleName ) !== false;
1236         }
1237
1238         /**
1239          * ParserOptions are constructed before we determined the language, so fix it
1240          *
1241          * @param Language $lang
1242          */
1243         public function setParserLanguage( $lang ) {
1244                 $this->parserOptions->setTargetLanguage( $lang );
1245                 $this->parserOptions->setUserLang( $lang );
1246         }
1247
1248         /**
1249          * Overridden by WebInstaller to provide lastPage parameters.
1250          * @param string $page
1251          * @return string
1252          */
1253         protected function getDocUrl( $page ) {
1254                 return "{$_SERVER['PHP_SELF']}?page=" . urlencode( $page );
1255         }
1256
1257         /**
1258          * Finds extensions that follow the format /$directory/Name/Name.php,
1259          * and returns an array containing the value for 'Name' for each found extension.
1260          *
1261          * Reasonable values for $directory include 'extensions' (the default) and 'skins'.
1262          *
1263          * @param string $directory Directory to search in
1264          * @return array [ $extName => [ 'screenshots' => [ '...' ] ]
1265          */
1266         public function findExtensions( $directory = 'extensions' ) {
1267                 if ( $this->getVar( 'IP' ) === null ) {
1268                         return [];
1269                 }
1270
1271                 $extDir = $this->getVar( 'IP' ) . '/' . $directory;
1272                 if ( !is_readable( $extDir ) || !is_dir( $extDir ) ) {
1273                         return [];
1274                 }
1275
1276                 // extensions -> extension.json, skins -> skin.json
1277                 $jsonFile = substr( $directory, 0, strlen( $directory ) - 1 ) . '.json';
1278
1279                 $dh = opendir( $extDir );
1280                 $exts = [];
1281                 while ( ( $file = readdir( $dh ) ) !== false ) {
1282                         if ( !is_dir( "$extDir/$file" ) ) {
1283                                 continue;
1284                         }
1285                         $fullJsonFile = "$extDir/$file/$jsonFile";
1286                         $isJson = file_exists( $fullJsonFile );
1287                         $isPhp = false;
1288                         if ( !$isJson ) {
1289                                 // Only fallback to PHP file if JSON doesn't exist
1290                                 $fullPhpFile = "$extDir/$file/$file.php";
1291                                 $isPhp = file_exists( $fullPhpFile );
1292                         }
1293                         if ( $isJson || $isPhp ) {
1294                                 // Extension exists. Now see if there are screenshots
1295                                 $exts[$file] = [];
1296                                 if ( is_dir( "$extDir/$file/screenshots" ) ) {
1297                                         $paths = glob( "$extDir/$file/screenshots/*.png" );
1298                                         foreach ( $paths as $path ) {
1299                                                 $exts[$file]['screenshots'][] = str_replace( $extDir, "../$directory", $path );
1300                                         }
1301
1302                                 }
1303                         }
1304                         if ( $isJson ) {
1305                                 $info = $this->readExtension( $fullJsonFile );
1306                                 if ( $info === false ) {
1307                                         continue;
1308                                 }
1309                                 $exts[$file] += $info;
1310                         }
1311                 }
1312                 closedir( $dh );
1313                 uksort( $exts, 'strnatcasecmp' );
1314
1315                 return $exts;
1316         }
1317
1318         /**
1319          * @param string $fullJsonFile
1320          * @param array $extDeps
1321          * @param array $skinDeps
1322          *
1323          * @return array|bool False if this extension can't be loaded
1324          */
1325         private function readExtension( $fullJsonFile, $extDeps = [], $skinDeps = [] ) {
1326                 $load = [
1327                         $fullJsonFile => 1
1328                 ];
1329                 if ( $extDeps ) {
1330                         $extDir = $this->getVar( 'IP' ) . '/extensions';
1331                         foreach ( $extDeps as $dep ) {
1332                                 $fname = "$extDir/$dep/extension.json";
1333                                 if ( !file_exists( $fname ) ) {
1334                                         return false;
1335                                 }
1336                                 $load[$fname] = 1;
1337                         }
1338                 }
1339                 if ( $skinDeps ) {
1340                         $skinDir = $this->getVar( 'IP' ) . '/skins';
1341                         foreach ( $skinDeps as $dep ) {
1342                                 $fname = "$skinDir/$dep/skin.json";
1343                                 if ( !file_exists( $fname ) ) {
1344                                         return false;
1345                                 }
1346                                 $load[$fname] = 1;
1347                         }
1348                 }
1349                 $registry = new ExtensionRegistry();
1350                 try {
1351                         $info = $registry->readFromQueue( $load );
1352                 } catch ( ExtensionDependencyError $e ) {
1353                         if ( $e->incompatibleCore || $e->incompatibleSkins
1354                                 || $e->incompatibleExtensions
1355                         ) {
1356                                 // If something is incompatible with a dependency, we have no real
1357                                 // option besides skipping it
1358                                 return false;
1359                         } elseif ( $e->missingExtensions || $e->missingSkins ) {
1360                                 // There's an extension missing in the dependency tree,
1361                                 // so add those to the dependency list and try again
1362                                 return $this->readExtension(
1363                                         $fullJsonFile,
1364                                         array_merge( $extDeps, $e->missingExtensions ),
1365                                         array_merge( $skinDeps, $e->missingSkins )
1366                                 );
1367                         }
1368                         // Some other kind of dependency error?
1369                         return false;
1370                 }
1371                 $ret = [];
1372                 // The order of credits will be the order of $load,
1373                 // so the first extension is the one we want to load,
1374                 // everything else is a dependency
1375                 $i = 0;
1376                 foreach ( $info['credits'] as $name => $credit ) {
1377                         $i++;
1378                         if ( $i == 1 ) {
1379                                 // Extension we want to load
1380                                 continue;
1381                         }
1382                         $type = basename( $credit['path'] ) === 'skin.json' ? 'skins' : 'extensions';
1383                         $ret['requires'][$type][] = $credit['name'];
1384                 }
1385                 $credits = array_values( $info['credits'] )[0];
1386                 if ( isset( $credits['url'] ) ) {
1387                         $ret['url'] = $credits['url'];
1388                 }
1389                 $ret['type'] = $credits['type'];
1390
1391                 return $ret;
1392         }
1393
1394         /**
1395          * Returns a default value to be used for $wgDefaultSkin: normally the one set in DefaultSettings,
1396          * but will fall back to another if the default skin is missing and some other one is present
1397          * instead.
1398          *
1399          * @param string[] $skinNames Names of installed skins.
1400          * @return string
1401          */
1402         public function getDefaultSkin( array $skinNames ) {
1403                 $defaultSkin = $GLOBALS['wgDefaultSkin'];
1404                 if ( !$skinNames || in_array( $defaultSkin, $skinNames ) ) {
1405                         return $defaultSkin;
1406                 } else {
1407                         return $skinNames[0];
1408                 }
1409         }
1410
1411         /**
1412          * Installs the auto-detected extensions.
1413          *
1414          * @return Status
1415          */
1416         protected function includeExtensions() {
1417                 global $IP;
1418                 $exts = $this->getVar( '_Extensions' );
1419                 $IP = $this->getVar( 'IP' );
1420
1421                 // Marker for DatabaseUpdater::loadExtensions so we don't
1422                 // double load extensions
1423                 define( 'MW_EXTENSIONS_LOADED', true );
1424
1425                 /**
1426                  * We need to include DefaultSettings before including extensions to avoid
1427                  * warnings about unset variables. However, the only thing we really
1428                  * want here is $wgHooks['LoadExtensionSchemaUpdates']. This won't work
1429                  * if the extension has hidden hook registration in $wgExtensionFunctions,
1430                  * but we're not opening that can of worms
1431                  * @see https://phabricator.wikimedia.org/T28857
1432                  */
1433                 global $wgAutoloadClasses;
1434                 $wgAutoloadClasses = [];
1435                 $queue = [];
1436
1437                 require "$IP/includes/DefaultSettings.php";
1438
1439                 foreach ( $exts as $e ) {
1440                         if ( file_exists( "$IP/extensions/$e/extension.json" ) ) {
1441                                 $queue["$IP/extensions/$e/extension.json"] = 1;
1442                         } else {
1443                                 require_once "$IP/extensions/$e/$e.php";
1444                         }
1445                 }
1446
1447                 $registry = new ExtensionRegistry();
1448                 $data = $registry->readFromQueue( $queue );
1449                 $wgAutoloadClasses += $data['autoload'];
1450
1451                 $hooksWeWant = isset( $wgHooks['LoadExtensionSchemaUpdates'] ) ?
1452                         /** @suppress PhanUndeclaredVariable $wgHooks is set by DefaultSettings */
1453                         $wgHooks['LoadExtensionSchemaUpdates'] : [];
1454
1455                 if ( isset( $data['globals']['wgHooks']['LoadExtensionSchemaUpdates'] ) ) {
1456                         $hooksWeWant = array_merge_recursive(
1457                                 $hooksWeWant,
1458                                 $data['globals']['wgHooks']['LoadExtensionSchemaUpdates']
1459                         );
1460                 }
1461                 // Unset everyone else's hooks. Lord knows what someone might be doing
1462                 // in ParserFirstCallInit (see T29171)
1463                 $GLOBALS['wgHooks'] = [ 'LoadExtensionSchemaUpdates' => $hooksWeWant ];
1464
1465                 return Status::newGood();
1466         }
1467
1468         /**
1469          * Get an array of install steps. Should always be in the format of
1470          * [
1471          *   'name'     => 'someuniquename',
1472          *   'callback' => [ $obj, 'method' ],
1473          * ]
1474          * There must be a config-install-$name message defined per step, which will
1475          * be shown on install.
1476          *
1477          * @param DatabaseInstaller $installer DatabaseInstaller so we can make callbacks
1478          * @return array
1479          */
1480         protected function getInstallSteps( DatabaseInstaller $installer ) {
1481                 $coreInstallSteps = [
1482                         [ 'name' => 'database', 'callback' => [ $installer, 'setupDatabase' ] ],
1483                         [ 'name' => 'tables', 'callback' => [ $installer, 'createTables' ] ],
1484                         [ 'name' => 'interwiki', 'callback' => [ $installer, 'populateInterwikiTable' ] ],
1485                         [ 'name' => 'stats', 'callback' => [ $this, 'populateSiteStats' ] ],
1486                         [ 'name' => 'keys', 'callback' => [ $this, 'generateKeys' ] ],
1487                         [ 'name' => 'updates', 'callback' => [ $installer, 'insertUpdateKeys' ] ],
1488                         [ 'name' => 'sysop', 'callback' => [ $this, 'createSysop' ] ],
1489                         [ 'name' => 'mainpage', 'callback' => [ $this, 'createMainpage' ] ],
1490                 ];
1491
1492                 // Build the array of install steps starting from the core install list,
1493                 // then adding any callbacks that wanted to attach after a given step
1494                 foreach ( $coreInstallSteps as $step ) {
1495                         $this->installSteps[] = $step;
1496                         if ( isset( $this->extraInstallSteps[$step['name']] ) ) {
1497                                 $this->installSteps = array_merge(
1498                                         $this->installSteps,
1499                                         $this->extraInstallSteps[$step['name']]
1500                                 );
1501                         }
1502                 }
1503
1504                 // Prepend any steps that want to be at the beginning
1505                 if ( isset( $this->extraInstallSteps['BEGINNING'] ) ) {
1506                         $this->installSteps = array_merge(
1507                                 $this->extraInstallSteps['BEGINNING'],
1508                                 $this->installSteps
1509                         );
1510                 }
1511
1512                 // Extensions should always go first, chance to tie into hooks and such
1513                 if ( count( $this->getVar( '_Extensions' ) ) ) {
1514                         array_unshift( $this->installSteps,
1515                                 [ 'name' => 'extensions', 'callback' => [ $this, 'includeExtensions' ] ]
1516                         );
1517                         $this->installSteps[] = [
1518                                 'name' => 'extension-tables',
1519                                 'callback' => [ $installer, 'createExtensionTables' ]
1520                         ];
1521                 }
1522
1523                 return $this->installSteps;
1524         }
1525
1526         /**
1527          * Actually perform the installation.
1528          *
1529          * @param callable $startCB A callback array for the beginning of each step
1530          * @param callable $endCB A callback array for the end of each step
1531          *
1532          * @return array Array of Status objects
1533          */
1534         public function performInstallation( $startCB, $endCB ) {
1535                 $installResults = [];
1536                 $installer = $this->getDBInstaller();
1537                 $installer->preInstall();
1538                 $steps = $this->getInstallSteps( $installer );
1539                 foreach ( $steps as $stepObj ) {
1540                         $name = $stepObj['name'];
1541                         call_user_func_array( $startCB, [ $name ] );
1542
1543                         // Perform the callback step
1544                         $status = call_user_func( $stepObj['callback'], $installer );
1545
1546                         // Output and save the results
1547                         call_user_func( $endCB, $name, $status );
1548                         $installResults[$name] = $status;
1549
1550                         // If we've hit some sort of fatal, we need to bail.
1551                         // Callback already had a chance to do output above.
1552                         if ( !$status->isOk() ) {
1553                                 break;
1554                         }
1555                 }
1556                 if ( $status->isOk() ) {
1557                         $this->showMessage(
1558                                 'config-install-success',
1559                                 $this->getVar( 'wgServer' ),
1560                                 $this->getVar( 'wgScriptPath' )
1561                         );
1562                         $this->setVar( '_InstallDone', true );
1563                 }
1564
1565                 return $installResults;
1566         }
1567
1568         /**
1569          * Generate $wgSecretKey. Will warn if we had to use an insecure random source.
1570          *
1571          * @return Status
1572          */
1573         public function generateKeys() {
1574                 $keys = [ 'wgSecretKey' => 64 ];
1575                 if ( strval( $this->getVar( 'wgUpgradeKey' ) ) === '' ) {
1576                         $keys['wgUpgradeKey'] = 16;
1577                 }
1578
1579                 return $this->doGenerateKeys( $keys );
1580         }
1581
1582         /**
1583          * Generate a secret value for variables using our CryptRand generator.
1584          * Produce a warning if the random source was insecure.
1585          *
1586          * @param array $keys
1587          * @return Status
1588          */
1589         protected function doGenerateKeys( $keys ) {
1590                 $status = Status::newGood();
1591
1592                 $strong = true;
1593                 foreach ( $keys as $name => $length ) {
1594                         $secretKey = MWCryptRand::generateHex( $length, true );
1595                         if ( !MWCryptRand::wasStrong() ) {
1596                                 $strong = false;
1597                         }
1598
1599                         $this->setVar( $name, $secretKey );
1600                 }
1601
1602                 if ( !$strong ) {
1603                         $names = array_keys( $keys );
1604                         $names = preg_replace( '/^(.*)$/', '\$$1', $names );
1605                         global $wgLang;
1606                         $status->warning( 'config-insecure-keys', $wgLang->listToText( $names ), count( $names ) );
1607                 }
1608
1609                 return $status;
1610         }
1611
1612         /**
1613          * Create the first user account, grant it sysop and bureaucrat rights
1614          *
1615          * @return Status
1616          */
1617         protected function createSysop() {
1618                 $name = $this->getVar( '_AdminName' );
1619                 $user = User::newFromName( $name );
1620
1621                 if ( !$user ) {
1622                         // We should've validated this earlier anyway!
1623                         return Status::newFatal( 'config-admin-error-user', $name );
1624                 }
1625
1626                 if ( $user->idForName() == 0 ) {
1627                         $user->addToDatabase();
1628
1629                         try {
1630                                 $user->setPassword( $this->getVar( '_AdminPassword' ) );
1631                         } catch ( PasswordError $pwe ) {
1632                                 return Status::newFatal( 'config-admin-error-password', $name, $pwe->getMessage() );
1633                         }
1634
1635                         $user->addGroup( 'sysop' );
1636                         $user->addGroup( 'bureaucrat' );
1637                         if ( $this->getVar( '_AdminEmail' ) ) {
1638                                 $user->setEmail( $this->getVar( '_AdminEmail' ) );
1639                         }
1640                         $user->saveSettings();
1641
1642                         // Update user count
1643                         $ssUpdate = SiteStatsUpdate::factory( [ 'users' => 1 ] );
1644                         $ssUpdate->doUpdate();
1645                 }
1646                 $status = Status::newGood();
1647
1648                 if ( $this->getVar( '_Subscribe' ) && $this->getVar( '_AdminEmail' ) ) {
1649                         $this->subscribeToMediaWikiAnnounce( $status );
1650                 }
1651
1652                 return $status;
1653         }
1654
1655         /**
1656          * @param Status $s
1657          */
1658         private function subscribeToMediaWikiAnnounce( Status $s ) {
1659                 $params = [
1660                         'email' => $this->getVar( '_AdminEmail' ),
1661                         'language' => 'en',
1662                         'digest' => 0
1663                 ];
1664
1665                 // Mailman doesn't support as many languages as we do, so check to make
1666                 // sure their selected language is available
1667                 $myLang = $this->getVar( '_UserLang' );
1668                 if ( in_array( $myLang, $this->mediaWikiAnnounceLanguages ) ) {
1669                         $myLang = $myLang == 'pt-br' ? 'pt_BR' : $myLang; // rewrite to Mailman's pt_BR
1670                         $params['language'] = $myLang;
1671                 }
1672
1673                 if ( MWHttpRequest::canMakeRequests() ) {
1674                         $res = MWHttpRequest::factory( $this->mediaWikiAnnounceUrl,
1675                                 [ 'method' => 'POST', 'postData' => $params ], __METHOD__ )->execute();
1676                         if ( !$res->isOK() ) {
1677                                 $s->warning( 'config-install-subscribe-fail', $res->getMessage() );
1678                         }
1679                 } else {
1680                         $s->warning( 'config-install-subscribe-notpossible' );
1681                 }
1682         }
1683
1684         /**
1685          * Insert Main Page with default content.
1686          *
1687          * @param DatabaseInstaller $installer
1688          * @return Status
1689          */
1690         protected function createMainpage( DatabaseInstaller $installer ) {
1691                 $status = Status::newGood();
1692                 $title = Title::newMainPage();
1693                 if ( $title->exists() ) {
1694                         $status->warning( 'config-install-mainpage-exists' );
1695                         return $status;
1696                 }
1697                 try {
1698                         $page = WikiPage::factory( $title );
1699                         $content = new WikitextContent(
1700                                 wfMessage( 'mainpagetext' )->inContentLanguage()->text() . "\n\n" .
1701                                 wfMessage( 'mainpagedocfooter' )->inContentLanguage()->text()
1702                         );
1703
1704                         $status = $page->doEditContent( $content,
1705                                 '',
1706                                 EDIT_NEW,
1707                                 false,
1708                                 User::newFromName( 'MediaWiki default' )
1709                         );
1710                 } catch ( Exception $e ) {
1711                         // using raw, because $wgShowExceptionDetails can not be set yet
1712                         $status->fatal( 'config-install-mainpage-failed', $e->getMessage() );
1713                 }
1714
1715                 return $status;
1716         }
1717
1718         /**
1719          * Override the necessary bits of the config to run an installation.
1720          */
1721         public static function overrideConfig() {
1722                 // Use PHP's built-in session handling, since MediaWiki's
1723                 // SessionHandler can't work before we have an object cache set up.
1724                 define( 'MW_NO_SESSION_HANDLER', 1 );
1725
1726                 // Don't access the database
1727                 $GLOBALS['wgUseDatabaseMessages'] = false;
1728                 // Don't cache langconv tables
1729                 $GLOBALS['wgLanguageConverterCacheType'] = CACHE_NONE;
1730                 // Debug-friendly
1731                 $GLOBALS['wgShowExceptionDetails'] = true;
1732                 // Don't break forms
1733                 $GLOBALS['wgExternalLinkTarget'] = '_blank';
1734
1735                 // Extended debugging
1736                 $GLOBALS['wgShowSQLErrors'] = true;
1737                 $GLOBALS['wgShowDBErrorBacktrace'] = true;
1738
1739                 // Allow multiple ob_flush() calls
1740                 $GLOBALS['wgDisableOutputCompression'] = true;
1741
1742                 // Use a sensible cookie prefix (not my_wiki)
1743                 $GLOBALS['wgCookiePrefix'] = 'mw_installer';
1744
1745                 // Some of the environment checks make shell requests, remove limits
1746                 $GLOBALS['wgMaxShellMemory'] = 0;
1747
1748                 // Override the default CookieSessionProvider with a dummy
1749                 // implementation that won't stomp on PHP's cookies.
1750                 $GLOBALS['wgSessionProviders'] = [
1751                         [
1752                                 'class' => InstallerSessionProvider::class,
1753                                 'args' => [ [
1754                                         'priority' => 1,
1755                                 ] ]
1756                         ]
1757                 ];
1758
1759                 // Don't try to use any object cache for SessionManager either.
1760                 $GLOBALS['wgSessionCacheType'] = CACHE_NONE;
1761         }
1762
1763         /**
1764          * Add an installation step following the given step.
1765          *
1766          * @param callable $callback A valid installation callback array, in this form:
1767          *    [ 'name' => 'some-unique-name', 'callback' => [ $obj, 'function' ] ];
1768          * @param string $findStep The step to find. Omit to put the step at the beginning
1769          */
1770         public function addInstallStep( $callback, $findStep = 'BEGINNING' ) {
1771                 $this->extraInstallSteps[$findStep][] = $callback;
1772         }
1773
1774         /**
1775          * Disable the time limit for execution.
1776          * Some long-running pages (Install, Upgrade) will want to do this
1777          */
1778         protected function disableTimeLimit() {
1779                 Wikimedia\suppressWarnings();
1780                 set_time_limit( 0 );
1781                 Wikimedia\restoreWarnings();
1782         }
1783 }