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
  27 use MediaWiki\Interwiki\NullInterwikiLookup;
  28 use MediaWiki\MediaWikiServices;
  29 use MediaWiki\Shell\Shell;
  30
  31 /**
  32  * This documentation group collects source code files with deployment functionality.
  33  *
  34  * @defgroup Deployment Deployment
  35  */
  36
  37 /**
  38  * Base installer class.
  39  *
  40  * This class provides the base for installation and update functionality
  41  * for both MediaWiki core and extensions.
  42  *
  43  * @ingroup Deployment
  44  * @since 1.17
  45  */
  46 abstract class Installer {
  47
  48         /**
  49          * The oldest version of PCRE we can support.
  50          *
  51          * Defining this is necessary because PHP may be linked with a system version
  52          * of PCRE, which may be older than that bundled with the minimum PHP version.
  53          */
  54         const MINIMUM_PCRE_VERSION = '7.2';
  55
  56         /**
  57          * @var array
  58          */
  59         protected $settings;
  60
  61         /**
  62          * List of detected DBs, access using getCompiledDBs().
  63          *
  64          * @var array
  65          */
  66         protected $compiledDBs;
  67
  68         /**
  69          * Cached DB installer instances, access using getDBInstaller().
  70          *
  71          * @var array
  72          */
  73         protected $dbInstallers = [];
  74
  75         /**
  76          * Minimum memory size in MB.
  77          *
  78          * @var int
  79          */
  80         protected $minMemorySize = 50;
  81
  82         /**
  83          * Cached Title, used by parse().
  84          *
  85          * @var Title
  86          */
  87         protected $parserTitle;
  88
  89         /**
  90          * Cached ParserOptions, used by parse().
  91          *
  92          * @var ParserOptions
  93          */
  94         protected $parserOptions;
  95
  96         /**
  97          * Known database types. These correspond to the class names <type>Installer,
  98          * and are also MediaWiki database types valid for $wgDBtype.
  99          *
 100          * To add a new type, create a <type>Installer class and a Database<type>
 101          * class, and add a config-type-<type> message to MessagesEn.php.
 102          *
 103          * @var array
 104          */
 105         protected static $dbTypes = [
 106                 'mysql',
 107                 'postgres',
 108                 'oracle',
 109                 'mssql',
 110                 'sqlite',
 111         ];
 112
 113         /**
 114          * A list of environment check methods called by doEnvironmentChecks().
 115          * These may output warnings using showMessage(), and/or abort the
 116          * installation process by returning false.
 117          *
 118          * For the WebInstaller these are only called on the Welcome page,
 119          * if these methods have side-effects that should affect later page loads
 120          * (as well as the generated stylesheet), use envPreps instead.
 121          *
 122          * @var array
 123          */
 124         protected $envChecks = [
 125                 'envCheckDB',
 126                 'envCheckBrokenXML',
 127                 'envCheckPCRE',
 128                 'envCheckMemory',
 129                 'envCheckCache',
 130                 'envCheckModSecurity',
 131                 'envCheckDiff3',
 132                 'envCheckGraphics',
 133                 'envCheckGit',
 134                 'envCheckServer',
 135                 'envCheckPath',
 136                 'envCheckShellLocale',
 137                 'envCheckUploadsDirectory',
 138                 'envCheckLibicu',
 139                 'envCheckSuhosinMaxValueLength',
 140                 'envCheck64Bit',
 141         ];
 142
 143         /**
 144          * A list of environment preparation methods called by doEnvironmentPreps().
 145          *
 146          * @var array
 147          */
 148         protected $envPreps = [
 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 = [
 161                 'wgSitename',
 162                 'wgPasswordSender',
 163                 'wgLanguageCode',
 164                 'wgRightsIcon',
 165                 'wgRightsText',
 166                 'wgRightsUrl',
 167                 'wgEnableEmail',
 168                 'wgEnableUserEmail',
 169                 'wgEnotifUserTalk',
 170                 'wgEnotifWatchlist',
 171                 'wgEmailAuthentication',
 172                 'wgDBname',
 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                 'wgPingback',
 188         ];
 189
 190         /**
 191          * Variables that are stored alongside globals, and are used for any
 192          * configuration of the installation process aside from the MediaWiki
 193          * configuration. Map of names to defaults.
 194          *
 195          * @var array
 196          */
 197         protected $internalDefaults = [
 198                 '_UserLang' => 'en',
 199                 '_Environment' => false,
 200                 '_RaiseMemory' => false,
 201                 '_UpgradeDone' => false,
 202                 '_InstallDone' => false,
 203                 '_Caches' => [],
 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' => [],
 218                 '_Skins' => [],
 219                 '_MemCachedServers' => '',
 220                 '_UpgradeKeySupplied' => false,
 221                 '_ExistingDBSettings' => false,
 222
 223                 // $wgLogo is probably wrong (T50084); set something that will work.
 224                 // Single quotes work fine here, as LocalSettingsGenerator outputs this unescaped.
 225                 'wgLogo' => '$wgResourceBasePath/resources/assets/wiki.png',
 226                 'wgAuthenticationTokenVersion' => 1,
 227         ];
 228
 229         /**
 230          * The actual list of installation steps. This will be initialized by getInstallSteps()
 231          *
 232          * @var array
 233          */
 234         private $installSteps = [];
 235
 236         /**
 237          * Extra steps for installation, for things like DatabaseInstallers to modify
 238          *
 239          * @var array
 240          */
 241         protected $extraInstallSteps = [];
 242
 243         /**
 244          * Known object cache types and the functions used to test for their existence.
 245          *
 246          * @var array
 247          */
 248         protected $objectCaches = [
 249                 'apc' => 'apc_fetch',
 250                 'apcu' => 'apcu_fetch',
 251                 'wincache' => 'wincache_ucache_get'
 252         ];
 253
 254         /**
 255          * User rights profiles.
 256          *
 257          * @var array
 258          */
 259         public $rightsProfiles = [
 260                 'wiki' => [],
 261                 'no-anon' => [
 262                         '*' => [ 'edit' => false ]
 263                 ],
 264                 'fishbowl' => [
 265                         '*' => [
 266                                 'createaccount' => false,
 267                                 'edit' => false,
 268                         ],
 269                 ],
 270                 'private' => [
 271                         '*' => [
 272                                 'createaccount' => false,
 273                                 'edit' => false,
 274                                 'read' => false,
 275                         ],
 276                 ],
 277         ];
 278
 279         /**
 280          * License types.
 281          *
 282          * @var array
 283          */
 284         public $licenses = [
 285                 'cc-by' => [
 286                         'url' => 'https://creativecommons.org/licenses/by/4.0/',
 287                         'icon' => '$wgResourceBasePath/resources/assets/licenses/cc-by.png',
 288                 ],
 289                 'cc-by-sa' => [
 290                         'url' => 'https://creativecommons.org/licenses/by-sa/4.0/',
 291                         'icon' => '$wgResourceBasePath/resources/assets/licenses/cc-by-sa.png',
 292                 ],
 293                 'cc-by-nc-sa' => [
 294                         'url' => 'https://creativecommons.org/licenses/by-nc-sa/4.0/',
 295                         'icon' => '$wgResourceBasePath/resources/assets/licenses/cc-by-nc-sa.png',
 296                 ],
 297                 'cc-0' => [
 298                         'url' => 'https://creativecommons.org/publicdomain/zero/1.0/',
 299                         'icon' => '$wgResourceBasePath/resources/assets/licenses/cc-0.png',
 300                 ],
 301                 'gfdl' => [
 302                         'url' => 'https://www.gnu.org/copyleft/fdl.html',
 303                         'icon' => '$wgResourceBasePath/resources/assets/licenses/gnu-fdl.png',
 304                 ],
 305                 'none' => [
 306                         'url' => '',
 307                         'icon' => '',
 308                         'text' => ''
 309                 ],
 310                 'cc-choose' => [
 311                         // Details will be filled in by the selector.
 312                         'url' => '',
 313                         'icon' => '',
 314                         'text' => '',
 315                 ],
 316         ];
 317
 318         /**
 319          * URL to mediawiki-announce subscription
 320          */
 321         protected $mediaWikiAnnounceUrl =
 322                 'https://lists.wikimedia.org/mailman/subscribe/mediawiki-announce';
 323
 324         /**
 325          * Supported language codes for Mailman
 326          */
 327         protected $mediaWikiAnnounceLanguages = [
 328                 'ca', 'cs', 'da', 'de', 'en', 'es', 'et', 'eu', 'fi', 'fr', 'hr', 'hu',
 329                 'it', 'ja', 'ko', 'lt', 'nl', 'no', 'pl', 'pt', 'pt-br', 'ro', 'ru',
 330                 'sl', 'sr', 'sv', 'tr', 'uk'
 331         ];
 332
 333         /**
 334          * UI interface for displaying a short message
 335          * The parameters are like parameters to wfMessage().
 336          * The messages will be in wikitext format, which will be converted to an
 337          * output format such as HTML or text before being sent to the user.
 338          * @param string $msg
 339          * @param mixed ...$params
 340          */
 341         abstract public function showMessage( $msg, ...$params );
 342
 343         /**
 344          * Same as showMessage(), but for displaying errors
 345          * @param string $msg
 346          * @param mixed ...$params
 347          */
 348         abstract public function showError( $msg, ...$params );
 349
 350         /**
 351          * Show a message to the installing user by using a Status object
 352          * @param Status $status
 353          */
 354         abstract public function showStatusMessage( Status $status );
 355
 356         /**
 357          * Constructs a Config object that contains configuration settings that should be
 358          * overwritten for the installation process.
 359          *
 360          * @since 1.27
 361          *
 362          * @param Config $baseConfig
 363          *
 364          * @return Config The config to use during installation.
 365          */
 366         public static function getInstallerConfig( Config $baseConfig ) {
 367                 $configOverrides = new HashConfig();
 368
 369                 // disable (problematic) object cache types explicitly, preserving all other (working) ones
 370                 // bug T113843
 371                 $emptyCache = [ 'class' => EmptyBagOStuff::class ];
 372
 373                 $objectCaches = [
 374                                 CACHE_NONE => $emptyCache,
 375                                 CACHE_DB => $emptyCache,
 376                                 CACHE_ANYTHING => $emptyCache,
 377                                 CACHE_MEMCACHED => $emptyCache,
 378                         ] + $baseConfig->get( 'ObjectCaches' );
 379
 380                 $configOverrides->set( 'ObjectCaches', $objectCaches );
 381
 382                 // Load the installer's i18n.
 383                 $messageDirs = $baseConfig->get( 'MessagesDirs' );
 384                 $messageDirs['MediawikiInstaller'] = __DIR__ . '/i18n';
 385
 386                 $configOverrides->set( 'MessagesDirs', $messageDirs );
 387
 388                 $installerConfig = new MultiConfig( [ $configOverrides, $baseConfig ] );
 389
 390                 // make sure we use the installer config as the main config
 391                 $configRegistry = $baseConfig->get( 'ConfigRegistry' );
 392                 $configRegistry['main'] = function () use ( $installerConfig ) {
 393                         return $installerConfig;
 394                 };
 395
 396                 $configOverrides->set( 'ConfigRegistry', $configRegistry );
 397
 398                 return $installerConfig;
 399         }
 400
 401         /**
 402          * Constructor, always call this from child classes.
 403          */
 404         public function __construct() {
 405                 global $wgMemc, $wgUser, $wgObjectCaches;
 406
 407                 $defaultConfig = new GlobalVarConfig(); // all the stuff from DefaultSettings.php
 408                 $installerConfig = self::getInstallerConfig( $defaultConfig );
 409
 410                 // Reset all services and inject config overrides
 411                 MediaWikiServices::resetGlobalInstance( $installerConfig );
 412
 413                 // Don't attempt to load user language options (T126177)
 414                 // This will be overridden in the web installer with the user-specified language
 415                 RequestContext::getMain()->setLanguage( 'en' );
 416
 417                 // Disable the i18n cache
 418                 // TODO: manage LocalisationCache singleton in MediaWikiServices
 419                 Language::getLocalisationCache()->disableBackend();
 420
 421                 // Disable all global services, since we don't have any configuration yet!
 422                 MediaWikiServices::disableStorageBackend();
 423
 424                 $mwServices = MediaWikiServices::getInstance();
 425                 // Disable object cache (otherwise CACHE_ANYTHING will try CACHE_DB and
 426                 // SqlBagOStuff will then throw since we just disabled wfGetDB)
 427                 $wgObjectCaches = $mwServices->getMainConfig()->get( 'ObjectCaches' );
 428                 $wgMemc = ObjectCache::getInstance( CACHE_NONE );
 429
 430                 // Disable interwiki lookup, to avoid database access during parses
 431                 $mwServices->redefineService( 'InterwikiLookup', function () {
 432                         return new NullInterwikiLookup();
 433                 } );
 434
 435                 // Having a user with id = 0 safeguards us from DB access via User::loadOptions().
 436                 $wgUser = User::newFromId( 0 );
 437                 RequestContext::getMain()->setUser( $wgUser );
 438
 439                 $this->settings = $this->internalDefaults;
 440
 441                 foreach ( $this->defaultVarNames as $var ) {
 442                         $this->settings[$var] = $GLOBALS[$var];
 443                 }
 444
 445                 $this->doEnvironmentPreps();
 446
 447                 $this->compiledDBs = [];
 448                 foreach ( self::getDBTypes() as $type ) {
 449                         $installer = $this->getDBInstaller( $type );
 450
 451                         if ( !$installer->isCompiled() ) {
 452                                 continue;
 453                         }
 454                         $this->compiledDBs[] = $type;
 455                 }
 456
 457                 $this->parserTitle = Title::newFromText( 'Installer' );
 458                 $this->parserOptions = new ParserOptions( $wgUser ); // language will be wrong :(
 459                 $this->parserOptions->setTidy( true );
 460                 // Don't try to access DB before user language is initialised
 461                 $this->setParserLanguage( Language::factory( 'en' ) );
 462         }
 463
 464         /**
 465          * Get a list of known DB types.
 466          *
 467          * @return array
 468          */
 469         public static function getDBTypes() {
 470                 return self::$dbTypes;
 471         }
 472
 473         /**
 474          * Do initial checks of the PHP environment. Set variables according to
 475          * the observed environment.
 476          *
 477          * It's possible that this may be called under the CLI SAPI, not the SAPI
 478          * that the wiki will primarily run under. In that case, the subclass should
 479          * initialise variables such as wgScriptPath, before calling this function.
 480          *
 481          * Under the web subclass, it can already be assumed that PHP 5+ is in use
 482          * and that sessions are working.
 483          *
 484          * @return Status
 485          */
 486         public function doEnvironmentChecks() {
 487                 // Php version has already been checked by entry scripts
 488                 // Show message here for information purposes
 489                 if ( wfIsHHVM() ) {
 490                         $this->showMessage( 'config-env-hhvm', HHVM_VERSION );
 491                 } else {
 492                         $this->showMessage( 'config-env-php', PHP_VERSION );
 493                 }
 494
 495                 $good = true;
 496                 // Must go here because an old version of PCRE can prevent other checks from completing
 497                 list( $pcreVersion ) = explode( ' ', PCRE_VERSION, 2 );
 498                 if ( version_compare( $pcreVersion, self::MINIMUM_PCRE_VERSION, '<' ) ) {
 499                         $this->showError( 'config-pcre-old', self::MINIMUM_PCRE_VERSION, $pcreVersion );
 500                         $good = false;
 501                 } else {
 502                         foreach ( $this->envChecks as $check ) {
 503                                 $status = $this->$check();
 504                                 if ( $status === false ) {
 505                                         $good = false;
 506                                 }
 507                         }
 508                 }
 509
 510                 $this->setVar( '_Environment', $good );
 511
 512                 return $good ? Status::newGood() : Status::newFatal( 'config-env-bad' );
 513         }
 514
 515         public function doEnvironmentPreps() {
 516                 foreach ( $this->envPreps as $prep ) {
 517                         $this->$prep();
 518                 }
 519         }
 520
 521         /**
 522          * Set a MW configuration variable, or internal installer configuration variable.
 523          *
 524          * @param string $name
 525          * @param mixed $value
 526          */
 527         public function setVar( $name, $value ) {
 528                 $this->settings[$name] = $value;
 529         }
 530
 531         /**
 532          * Get an MW configuration variable, or internal installer configuration variable.
 533          * The defaults come from $GLOBALS (ultimately DefaultSettings.php).
 534          * Installer variables are typically prefixed by an underscore.
 535          *
 536          * @param string $name
 537          * @param mixed|null $default
 538          *
 539          * @return mixed
 540          */
 541         public function getVar( $name, $default = null ) {
 542                 return $this->settings[$name] ?? $default;
 543         }
 544
 545         /**
 546          * Get a list of DBs supported by current PHP setup
 547          *
 548          * @return array
 549          */
 550         public function getCompiledDBs() {
 551                 return $this->compiledDBs;
 552         }
 553
 554         /**
 555          * Get the DatabaseInstaller class name for this type
 556          *
 557          * @param string $type database type ($wgDBtype)
 558          * @return string Class name
 559          * @since 1.30
 560          */
 561         public static function getDBInstallerClass( $type ) {
 562                 return ucfirst( $type ) . 'Installer';
 563         }
 564
 565         /**
 566          * Get an instance of DatabaseInstaller for the specified DB type.
 567          *
 568          * @param mixed $type DB installer for which is needed, false to use default.
 569          *
 570          * @return DatabaseInstaller
 571          */
 572         public function getDBInstaller( $type = false ) {
 573                 if ( !$type ) {
 574                         $type = $this->getVar( 'wgDBtype' );
 575                 }
 576
 577                 $type = strtolower( $type );
 578
 579                 if ( !isset( $this->dbInstallers[$type] ) ) {
 580                         $class = self::getDBInstallerClass( $type );
 581                         $this->dbInstallers[$type] = new $class( $this );
 582                 }
 583
 584                 return $this->dbInstallers[$type];
 585         }
 586
 587         /**
 588          * Determine if LocalSettings.php exists. If it does, return its variables.
 589          *
 590          * @return array|false
 591          */
 592         public static function getExistingLocalSettings() {
 593                 global $IP;
 594
 595                 // You might be wondering why this is here. Well if you don't do this
 596                 // then some poorly-formed extensions try to call their own classes
 597                 // after immediately registering them. We really need to get extension
 598                 // registration out of the global scope and into a real format.
 599                 // @see https://phabricator.wikimedia.org/T69440
 600                 global $wgAutoloadClasses;
 601                 $wgAutoloadClasses = [];
 602
 603                 // LocalSettings.php should not call functions, except wfLoadSkin/wfLoadExtensions
 604                 // Define the required globals here, to ensure, the functions can do it work correctly.
 605                 // phpcs:ignore MediaWiki.VariableAnalysis.UnusedGlobalVariables
 606                 global $wgExtensionDirectory, $wgStyleDirectory;
 607
 608                 Wikimedia\suppressWarnings();
 609                 $_lsExists = file_exists( "$IP/LocalSettings.php" );
 610                 Wikimedia\restoreWarnings();
 611
 612                 if ( !$_lsExists ) {
 613                         return false;
 614                 }
 615                 unset( $_lsExists );
 616
 617                 require "$IP/includes/DefaultSettings.php";
 618                 require "$IP/LocalSettings.php";
 619
 620                 return get_defined_vars();
 621         }
 622
 623         /**
 624          * Get a fake password for sending back to the user in HTML.
 625          * This is a security mechanism to avoid compromise of the password in the
 626          * event of session ID compromise.
 627          *
 628          * @param string $realPassword
 629          *
 630          * @return string
 631          */
 632         public function getFakePassword( $realPassword ) {
 633                 return str_repeat( '*', strlen( $realPassword ) );
 634         }
 635
 636         /**
 637          * Set a variable which stores a password, except if the new value is a
 638          * fake password in which case leave it as it is.
 639          *
 640          * @param string $name
 641          * @param mixed $value
 642          */
 643         public function setPassword( $name, $value ) {
 644                 if ( !preg_match( '/^\*+$/', $value ) ) {
 645                         $this->setVar( $name, $value );
 646                 }
 647         }
 648
 649         /**
 650          * On POSIX systems return the primary group of the webserver we're running under.
 651          * On other systems just returns null.
 652          *
 653          * This is used to advice the user that he should chgrp his mw-config/data/images directory as the
 654          * webserver user before he can install.
 655          *
 656          * Public because SqliteInstaller needs it, and doesn't subclass Installer.
 657          *
 658          * @return mixed
 659          */
 660         public static function maybeGetWebserverPrimaryGroup() {
 661                 if ( !function_exists( 'posix_getegid' ) || !function_exists( 'posix_getpwuid' ) ) {
 662                         # I don't know this, this isn't UNIX.
 663                         return null;
 664                 }
 665
 666                 # posix_getegid() *not* getmygid() because we want the group of the webserver,
 667                 # not whoever owns the current script.
 668                 $gid = posix_getegid();
 669                 $group = posix_getpwuid( $gid )['name'];
 670
 671                 return $group;
 672         }
 673
 674         /**
 675          * Convert wikitext $text to HTML.
 676          *
 677          * This is potentially error prone since many parser features require a complete
 678          * installed MW database. The solution is to just not use those features when you
 679          * write your messages. This appears to work well enough. Basic formatting and
 680          * external links work just fine.
 681          *
 682          * But in case a translator decides to throw in a "#ifexist" or internal link or
 683          * whatever, this function is guarded to catch the attempted DB access and to present
 684          * some fallback text.
 685          *
 686          * @param string $text
 687          * @param bool $lineStart
 688          * @return string
 689          */
 690         public function parse( $text, $lineStart = false ) {
 691                 $parser = MediaWikiServices::getInstance()->getParser();
 692
 693                 try {
 694                         $out = $parser->parse( $text, $this->parserTitle, $this->parserOptions, $lineStart );
 695                         $html = $out->getText( [
 696                                 'enableSectionEditLinks' => false,
 697                                 'unwrap' => true,
 698                         ] );
 699                 } catch ( Wikimedia\Services\ServiceDisabledException $e ) {
 700                         $html = '<!--DB access attempted during parse-->  ' . htmlspecialchars( $text );
 701                 }
 702
 703                 return $html;
 704         }
 705
 706         /**
 707          * @return ParserOptions
 708          */
 709         public function getParserOptions() {
 710                 return $this->parserOptions;
 711         }
 712
 713         public function disableLinkPopups() {
 714                 $this->parserOptions->setExternalLinkTarget( false );
 715         }
 716
 717         public function restoreLinkPopups() {
 718                 global $wgExternalLinkTarget;
 719                 $this->parserOptions->setExternalLinkTarget( $wgExternalLinkTarget );
 720         }
 721
 722         /**
 723          * Install step which adds a row to the site_stats table with appropriate
 724          * initial values.
 725          *
 726          * @param DatabaseInstaller $installer
 727          *
 728          * @return Status
 729          */
 730         public function populateSiteStats( DatabaseInstaller $installer ) {
 731                 $status = $installer->getConnection();
 732                 if ( !$status->isOK() ) {
 733                         return $status;
 734                 }
 735                 $status->value->insert(
 736                         'site_stats',
 737                         [
 738                                 'ss_row_id' => 1,
 739                                 'ss_total_edits' => 0,
 740                                 'ss_good_articles' => 0,
 741                                 'ss_total_pages' => 0,
 742                                 'ss_users' => 0,
 743                                 'ss_active_users' => 0,
 744                                 'ss_images' => 0
 745                         ],
 746                         __METHOD__, 'IGNORE'
 747                 );
 748
 749                 return Status::newGood();
 750         }
 751
 752         /**
 753          * Environment check for DB types.
 754          * @return bool
 755          */
 756         protected function envCheckDB() {
 757                 global $wgLang;
 758
 759                 $allNames = [];
 760
 761                 // Messages: config-type-mysql, config-type-postgres, config-type-oracle,
 762                 // config-type-sqlite
 763                 foreach ( self::getDBTypes() as $name ) {
 764                         $allNames[] = wfMessage( "config-type-$name" )->text();
 765                 }
 766
 767                 $databases = $this->getCompiledDBs();
 768
 769                 $databases = array_flip( $databases );
 770                 foreach ( array_keys( $databases ) as $db ) {
 771                         $installer = $this->getDBInstaller( $db );
 772                         $status = $installer->checkPrerequisites();
 773                         if ( !$status->isGood() ) {
 774                                 $this->showStatusMessage( $status );
 775                         }
 776                         if ( !$status->isOK() ) {
 777                                 unset( $databases[$db] );
 778                         }
 779                 }
 780                 $databases = array_flip( $databases );
 781                 if ( !$databases ) {
 782                         $this->showError( 'config-no-db', $wgLang->commaList( $allNames ), count( $allNames ) );
 783
 784                         // @todo FIXME: This only works for the web installer!
 785                         return false;
 786                 }
 787
 788                 return true;
 789         }
 790
 791         /**
 792          * Some versions of libxml+PHP break < and > encoding horribly
 793          * @return bool
 794          */
 795         protected function envCheckBrokenXML() {
 796                 $test = new PhpXmlBugTester();
 797                 if ( !$test->ok ) {
 798                         $this->showError( 'config-brokenlibxml' );
 799
 800                         return false;
 801                 }
 802
 803                 return true;
 804         }
 805
 806         /**
 807          * Environment check for the PCRE module.
 808          *
 809          * @note If this check were to fail, the parser would
 810          *   probably throw an exception before the result
 811          *   of this check is shown to the user.
 812          * @return bool
 813          */
 814         protected function envCheckPCRE() {
 815                 Wikimedia\suppressWarnings();
 816                 $regexd = preg_replace( '/[\x{0430}-\x{04FF}]/iu', '', '-АБВГД-' );
 817                 // Need to check for \p support too, as PCRE can be compiled
 818                 // with utf8 support, but not unicode property support.
 819                 // check that \p{Zs} (space separators) matches
 820                 // U+3000 (Ideographic space)
 821                 $regexprop = preg_replace( '/\p{Zs}/u', '', "-\u{3000}-" );
 822                 Wikimedia\restoreWarnings();
 823                 if ( $regexd != '--' || $regexprop != '--' ) {
 824                         $this->showError( 'config-pcre-no-utf8' );
 825
 826                         return false;
 827                 }
 828
 829                 return true;
 830         }
 831
 832         /**
 833          * Environment check for available memory.
 834          * @return bool
 835          */
 836         protected function envCheckMemory() {
 837                 $limit = ini_get( 'memory_limit' );
 838
 839                 if ( !$limit || $limit == -1 ) {
 840                         return true;
 841                 }
 842
 843                 $n = wfShorthandToInteger( $limit );
 844
 845                 if ( $n < $this->minMemorySize * 1024 * 1024 ) {
 846                         $newLimit = "{$this->minMemorySize}M";
 847
 848                         if ( ini_set( "memory_limit", $newLimit ) === false ) {
 849                                 $this->showMessage( 'config-memory-bad', $limit );
 850                         } else {
 851                                 $this->showMessage( 'config-memory-raised', $limit, $newLimit );
 852                                 $this->setVar( '_RaiseMemory', true );
 853                         }
 854                 }
 855
 856                 return true;
 857         }
 858
 859         /**
 860          * Environment check for compiled object cache types.
 861          */
 862         protected function envCheckCache() {
 863                 $caches = [];
 864                 foreach ( $this->objectCaches as $name => $function ) {
 865                         if ( function_exists( $function ) ) {
 866                                 $caches[$name] = true;
 867                         }
 868                 }
 869
 870                 if ( !$caches ) {
 871                         $this->showMessage( 'config-no-cache-apcu' );
 872                 }
 873
 874                 $this->setVar( '_Caches', $caches );
 875         }
 876
 877         /**
 878          * Scare user to death if they have mod_security or mod_security2
 879          * @return bool
 880          */
 881         protected function envCheckModSecurity() {
 882                 if ( self::apacheModulePresent( 'mod_security' )
 883                         || self::apacheModulePresent( 'mod_security2' ) ) {
 884                         $this->showMessage( 'config-mod-security' );
 885                 }
 886
 887                 return true;
 888         }
 889
 890         /**
 891          * Search for GNU diff3.
 892          * @return bool
 893          */
 894         protected function envCheckDiff3() {
 895                 $names = [ "gdiff3", "diff3" ];
 896                 if ( wfIsWindows() ) {
 897                         $names[] = 'diff3.exe';
 898                 }
 899                 $versionInfo = [ '--version', 'GNU diffutils' ];
 900
 901                 $diff3 = ExecutableFinder::findInDefaultPaths( $names, $versionInfo );
 902
 903                 if ( $diff3 ) {
 904                         $this->setVar( 'wgDiff3', $diff3 );
 905                 } else {
 906                         $this->setVar( 'wgDiff3', false );
 907                         $this->showMessage( 'config-diff3-bad' );
 908                 }
 909
 910                 return true;
 911         }
 912
 913         /**
 914          * Environment check for ImageMagick and GD.
 915          * @return bool
 916          */
 917         protected function envCheckGraphics() {
 918                 $names = wfIsWindows() ? 'convert.exe' : 'convert';
 919                 $versionInfo = [ '-version', 'ImageMagick' ];
 920                 $convert = ExecutableFinder::findInDefaultPaths( $names, $versionInfo );
 921
 922                 $this->setVar( 'wgImageMagickConvertCommand', '' );
 923                 if ( $convert ) {
 924                         $this->setVar( 'wgImageMagickConvertCommand', $convert );
 925                         $this->showMessage( 'config-imagemagick', $convert );
 926
 927                         return true;
 928                 } elseif ( function_exists( 'imagejpeg' ) ) {
 929                         $this->showMessage( 'config-gd' );
 930                 } else {
 931                         $this->showMessage( 'config-no-scaling' );
 932                 }
 933
 934                 return true;
 935         }
 936
 937         /**
 938          * Search for git.
 939          *
 940          * @since 1.22
 941          * @return bool
 942          */
 943         protected function envCheckGit() {
 944                 $names = wfIsWindows() ? 'git.exe' : 'git';
 945                 $versionInfo = [ '--version', 'git version' ];
 946
 947                 $git = ExecutableFinder::findInDefaultPaths( $names, $versionInfo );
 948
 949                 if ( $git ) {
 950                         $this->setVar( 'wgGitBin', $git );
 951                         $this->showMessage( 'config-git', $git );
 952                 } else {
 953                         $this->setVar( 'wgGitBin', false );
 954                         $this->showMessage( 'config-git-bad' );
 955                 }
 956
 957                 return true;
 958         }
 959
 960         /**
 961          * Environment check to inform user which server we've assumed.
 962          *
 963          * @return bool
 964          */
 965         protected function envCheckServer() {
 966                 $server = $this->envGetDefaultServer();
 967                 if ( $server !== null ) {
 968                         $this->showMessage( 'config-using-server', $server );
 969                 }
 970                 return true;
 971         }
 972
 973         /**
 974          * Environment check to inform user which paths we've assumed.
 975          *
 976          * @return bool
 977          */
 978         protected function envCheckPath() {
 979                 $this->showMessage(
 980                         'config-using-uri',
 981                         $this->getVar( 'wgServer' ),
 982                         $this->getVar( 'wgScriptPath' )
 983                 );
 984                 return true;
 985         }
 986
 987         /**
 988          * Environment check for preferred locale in shell
 989          * @return bool
 990          */
 991         protected function envCheckShellLocale() {
 992                 $os = php_uname( 's' );
 993                 $supported = [ 'Linux', 'SunOS', 'HP-UX', 'Darwin' ]; # Tested these
 994
 995                 if ( !in_array( $os, $supported ) ) {
 996                         return true;
 997                 }
 998
 999                 if ( Shell::isDisabled() ) {
1000                         return true;
1001                 }
1002
1003                 # Get a list of available locales.
1004                 $result = Shell::command( '/usr/bin/locale', '-a' )
1005                         ->execute();
1006
1007                 if ( $result->getExitCode() != 0 ) {
1008                         return true;
1009                 }
1010
1011                 $lines = $result->getStdout();
1012                 $lines = array_map( 'trim', explode( "\n", $lines ) );
1013                 $candidatesByLocale = [];
1014                 $candidatesByLang = [];
1015                 foreach ( $lines as $line ) {
1016                         if ( $line === '' ) {
1017                                 continue;
1018                         }
1019
1020                         if ( !preg_match( '/^([a-zA-Z]+)(_[a-zA-Z]+|)\.(utf8|UTF-8)(@[a-zA-Z_]*|)$/i', $line, $m ) ) {
1021                                 continue;
1022                         }
1023
1024                         list( , $lang, , , ) = $m;
1025
1026                         $candidatesByLocale[$m[0]] = $m;
1027                         $candidatesByLang[$lang][] = $m;
1028                 }
1029
1030                 # Try the current value of LANG.
1031                 if ( isset( $candidatesByLocale[getenv( 'LANG' )] ) ) {
1032                         $this->setVar( 'wgShellLocale', getenv( 'LANG' ) );
1033
1034                         return true;
1035                 }
1036
1037                 # Try the most common ones.
1038                 $commonLocales = [ 'C.UTF-8', 'en_US.UTF-8', 'en_US.utf8', 'de_DE.UTF-8', 'de_DE.utf8' ];
1039                 foreach ( $commonLocales as $commonLocale ) {
1040                         if ( isset( $candidatesByLocale[$commonLocale] ) ) {
1041                                 $this->setVar( 'wgShellLocale', $commonLocale );
1042
1043                                 return true;
1044                         }
1045                 }
1046
1047                 # Is there an available locale in the Wiki's language?
1048                 $wikiLang = $this->getVar( 'wgLanguageCode' );
1049
1050                 if ( isset( $candidatesByLang[$wikiLang] ) ) {
1051                         $m = reset( $candidatesByLang[$wikiLang] );
1052                         $this->setVar( 'wgShellLocale', $m[0] );
1053
1054                         return true;
1055                 }
1056
1057                 # Are there any at all?
1058                 if ( count( $candidatesByLocale ) ) {
1059                         $m = reset( $candidatesByLocale );
1060                         $this->setVar( 'wgShellLocale', $m[0] );
1061
1062                         return true;
1063                 }
1064
1065                 # Give up.
1066                 return true;
1067         }
1068
1069         /**
1070          * Environment check for the permissions of the uploads directory
1071          * @return bool
1072          */
1073         protected function envCheckUploadsDirectory() {
1074                 global $IP;
1075
1076                 $dir = $IP . '/images/';
1077                 $url = $this->getVar( 'wgServer' ) . $this->getVar( 'wgScriptPath' ) . '/images/';
1078                 $safe = !$this->dirIsExecutable( $dir, $url );
1079
1080                 if ( !$safe ) {
1081                         $this->showMessage( 'config-uploads-not-safe', $dir );
1082                 }
1083
1084                 return true;
1085         }
1086
1087         /**
1088          * Checks if suhosin.get.max_value_length is set, and if so generate
1089          * a warning because it decreases ResourceLoader performance.
1090          * @return bool
1091          */
1092         protected function envCheckSuhosinMaxValueLength() {
1093                 $maxValueLength = ini_get( 'suhosin.get.max_value_length' );
1094                 if ( $maxValueLength > 0 && $maxValueLength < 1024 ) {
1095                         // Only warn if the value is below the sane 1024
1096                         $this->showMessage( 'config-suhosin-max-value-length', $maxValueLength );
1097                 }
1098
1099                 return true;
1100         }
1101
1102         /**
1103          * Checks if we're running on 64 bit or not. 32 bit is becoming increasingly
1104          * hard to support, so let's at least warn people.
1105          *
1106          * @return bool
1107          */
1108         protected function envCheck64Bit() {
1109                 if ( PHP_INT_SIZE == 4 ) {
1110                         $this->showMessage( 'config-using-32bit' );
1111                 }
1112
1113                 return true;
1114         }
1115
1116         /**
1117          * Check the libicu version
1118          */
1119         protected function envCheckLibicu() {
1120                 /**
1121                  * This needs to be updated something that the latest libicu
1122                  * will properly normalize.  This normalization was found at
1123                  * https://www.unicode.org/versions/Unicode5.2.0/#Character_Additions
1124                  * Note that we use the hex representation to create the code
1125                  * points in order to avoid any Unicode-destroying during transit.
1126                  */
1127                 $not_normal_c = "\u{FA6C}";
1128                 $normal_c = "\u{242EE}";
1129
1130                 $useNormalizer = 'php';
1131                 $needsUpdate = false;
1132
1133                 if ( function_exists( 'normalizer_normalize' ) ) {
1134                         $useNormalizer = 'intl';
1135                         $intl = normalizer_normalize( $not_normal_c, Normalizer::FORM_C );
1136                         if ( $intl !== $normal_c ) {
1137                                 $needsUpdate = true;
1138                         }
1139                 }
1140
1141                 // Uses messages 'config-unicode-using-php' and 'config-unicode-using-intl'
1142                 if ( $useNormalizer === 'php' ) {
1143                         $this->showMessage( 'config-unicode-pure-php-warning' );
1144                 } else {
1145                         $this->showMessage( 'config-unicode-using-' . $useNormalizer );
1146                         if ( $needsUpdate ) {
1147                                 $this->showMessage( 'config-unicode-update-warning' );
1148                         }
1149                 }
1150         }
1151
1152         /**
1153          * Environment prep for the server hostname.
1154          */
1155         protected function envPrepServer() {
1156                 $server = $this->envGetDefaultServer();
1157                 if ( $server !== null ) {
1158                         $this->setVar( 'wgServer', $server );
1159                 }
1160         }
1161
1162         /**
1163          * Helper function to be called from envPrepServer()
1164          * @return string
1165          */
1166         abstract protected function envGetDefaultServer();
1167
1168         /**
1169          * Environment prep for setting $IP and $wgScriptPath.
1170          */
1171         protected function envPrepPath() {
1172                 global $IP;
1173                 $IP = dirname( dirname( __DIR__ ) );
1174                 $this->setVar( 'IP', $IP );
1175         }
1176
1177         /**
1178          * Checks if scripts located in the given directory can be executed via the given URL.
1179          *
1180          * Used only by environment checks.
1181          * @param string $dir
1182          * @param string $url
1183          * @return bool|int|string
1184          */
1185         public function dirIsExecutable( $dir, $url ) {
1186                 $scriptTypes = [
1187                         'php' => [
1188                                 "<?php echo 'exec';",
1189                                 "#!/var/env php\n<?php echo 'exec';",
1190                         ],
1191                 ];
1192
1193                 // it would be good to check other popular languages here, but it'll be slow.
1194
1195                 Wikimedia\suppressWarnings();
1196
1197                 foreach ( $scriptTypes as $ext => $contents ) {
1198                         foreach ( $contents as $source ) {
1199                                 $file = 'exectest.' . $ext;
1200
1201                                 if ( !file_put_contents( $dir . $file, $source ) ) {
1202                                         break;
1203                                 }
1204
1205                                 try {
1206                                         $text = MediaWikiServices::getInstance()->getHttpRequestFactory()->
1207                                                 get( $url . $file, [ 'timeout' => 3 ], __METHOD__ );
1208                                 } catch ( Exception $e ) {
1209                                         // HttpRequestFactory::get can throw with allow_url_fopen = false and no curl
1210                                         // extension.
1211                                         $text = null;
1212                                 }
1213                                 unlink( $dir . $file );
1214
1215                                 if ( $text == 'exec' ) {
1216                                         Wikimedia\restoreWarnings();
1217
1218                                         return $ext;
1219                                 }
1220                         }
1221                 }
1222
1223                 Wikimedia\restoreWarnings();
1224
1225                 return false;
1226         }
1227
1228         /**
1229          * Checks for presence of an Apache module. Works only if PHP is running as an Apache module, too.
1230          *
1231          * @param string $moduleName Name of module to check.
1232          * @return bool
1233          */
1234         public static function apacheModulePresent( $moduleName ) {
1235                 if ( function_exists( 'apache_get_modules' ) && in_array( $moduleName, apache_get_modules() ) ) {
1236                         return true;
1237                 }
1238                 // try it the hard way
1239                 ob_start();
1240                 phpinfo( INFO_MODULES );
1241                 $info = ob_get_clean();
1242
1243                 return strpos( $info, $moduleName ) !== false;
1244         }
1245
1246         /**
1247          * ParserOptions are constructed before we determined the language, so fix it
1248          *
1249          * @param Language $lang
1250          */
1251         public function setParserLanguage( $lang ) {
1252                 $this->parserOptions->setTargetLanguage( $lang );
1253                 $this->parserOptions->setUserLang( $lang );
1254         }
1255
1256         /**
1257          * Overridden by WebInstaller to provide lastPage parameters.
1258          * @param string $page
1259          * @return string
1260          */
1261         protected function getDocUrl( $page ) {
1262                 return "{$_SERVER['PHP_SELF']}?page=" . urlencode( $page );
1263         }
1264
1265         /**
1266          * Find extensions or skins in a subdirectory of $IP.
1267          * Returns an array containing the value for 'Name' for each found extension.
1268          *
1269          * @param string $directory Directory to search in, relative to $IP, must be either "extensions"
1270          *     or "skins"
1271          * @return array [ $extName => [ 'screenshots' => [ '...' ] ]
1272          */
1273         public function findExtensions( $directory = 'extensions' ) {
1274                 switch ( $directory ) {
1275                         case 'extensions':
1276                                 return $this->findExtensionsByType( 'extension', 'extensions' );
1277                         case 'skins':
1278                                 return $this->findExtensionsByType( 'skin', 'skins' );
1279                         default:
1280                                 throw new InvalidArgumentException( "Invalid extension type" );
1281                 }
1282         }
1283
1284         /**
1285          * Find extensions or skins, and return an array containing the value for 'Name' for each found
1286          * extension.
1287          *
1288          * @param string $type Either "extension" or "skin"
1289          * @param string $directory Directory to search in, relative to $IP
1290          * @return array [ $extName => [ 'screenshots' => [ '...' ] ]
1291          */
1292         protected function findExtensionsByType( $type = 'extension', $directory = 'extensions' ) {
1293                 if ( $this->getVar( 'IP' ) === null ) {
1294                         return [];
1295                 }
1296
1297                 $extDir = $this->getVar( 'IP' ) . '/' . $directory;
1298                 if ( !is_readable( $extDir ) || !is_dir( $extDir ) ) {
1299                         return [];
1300                 }
1301
1302                 $dh = opendir( $extDir );
1303                 $exts = [];
1304                 while ( ( $file = readdir( $dh ) ) !== false ) {
1305                         if ( !is_dir( "$extDir/$file" ) ) {
1306                                 continue;
1307                         }
1308                         $status = $this->getExtensionInfo( $type, $directory, $file );
1309                         if ( $status->isOK() ) {
1310                                 $exts[$file] = $status->value;
1311                         }
1312                 }
1313                 closedir( $dh );
1314                 uksort( $exts, 'strnatcasecmp' );
1315
1316                 return $exts;
1317         }
1318
1319         /**
1320          * @param string $type Either "extension" or "skin"
1321          * @param string $parentRelPath The parent directory relative to $IP
1322          * @param string $name The extension or skin name
1323          * @return Status An object containing an error list. If there were no errors, an associative
1324          *     array of information about the extension can be found in $status->value.
1325          */
1326         protected function getExtensionInfo( $type, $parentRelPath, $name ) {
1327                 if ( $this->getVar( 'IP' ) === null ) {
1328                         throw new Exception( 'Cannot find extensions since the IP variable is not yet set' );
1329                 }
1330                 if ( $type !== 'extension' && $type !== 'skin' ) {
1331                         throw new InvalidArgumentException( "Invalid extension type" );
1332                 }
1333                 $absDir = $this->getVar( 'IP' ) . "/$parentRelPath/$name";
1334                 $relDir = "../$parentRelPath/$name";
1335                 if ( !is_dir( $absDir ) ) {
1336                         return Status::newFatal( 'config-extension-not-found', $name );
1337                 }
1338                 $jsonFile = $type . '.json';
1339                 $fullJsonFile = "$absDir/$jsonFile";
1340                 $isJson = file_exists( $fullJsonFile );
1341                 $isPhp = false;
1342                 if ( !$isJson ) {
1343                         // Only fallback to PHP file if JSON doesn't exist
1344                         $fullPhpFile = "$absDir/$name.php";
1345                         $isPhp = file_exists( $fullPhpFile );
1346                 }
1347                 if ( !$isJson && !$isPhp ) {
1348                         return Status::newFatal( 'config-extension-not-found', $name );
1349                 }
1350
1351                 // Extension exists. Now see if there are screenshots
1352                 $info = [];
1353                 if ( is_dir( "$absDir/screenshots" ) ) {
1354                         $paths = glob( "$absDir/screenshots/*.png" );
1355                         foreach ( $paths as $path ) {
1356                                 $info['screenshots'][] = str_replace( $absDir, $relDir, $path );
1357                         }
1358                 }
1359
1360                 if ( $isJson ) {
1361                         $jsonStatus = $this->readExtension( $fullJsonFile );
1362                         if ( !$jsonStatus->isOK() ) {
1363                                 return $jsonStatus;
1364                         }
1365                         $info += $jsonStatus->value;
1366                 }
1367
1368                 return Status::newGood( $info );
1369         }
1370
1371         /**
1372          * @param string $fullJsonFile
1373          * @param array $extDeps
1374          * @param array $skinDeps
1375          *
1376          * @return Status On success, an array of extension information is in $status->value. On
1377          *    failure, the Status object will have an error list.
1378          */
1379         private function readExtension( $fullJsonFile, $extDeps = [], $skinDeps = [] ) {
1380                 $load = [
1381                         $fullJsonFile => 1
1382                 ];
1383                 if ( $extDeps ) {
1384                         $extDir = $this->getVar( 'IP' ) . '/extensions';
1385                         foreach ( $extDeps as $dep ) {
1386                                 $fname = "$extDir/$dep/extension.json";
1387                                 if ( !file_exists( $fname ) ) {
1388                                         return Status::newFatal( 'config-extension-not-found', $dep );
1389                                 }
1390                                 $load[$fname] = 1;
1391                         }
1392                 }
1393                 if ( $skinDeps ) {
1394                         $skinDir = $this->getVar( 'IP' ) . '/skins';
1395                         foreach ( $skinDeps as $dep ) {
1396                                 $fname = "$skinDir/$dep/skin.json";
1397                                 if ( !file_exists( $fname ) ) {
1398                                         return Status::newFatal( 'config-extension-not-found', $dep );
1399                                 }
1400                                 $load[$fname] = 1;
1401                         }
1402                 }
1403                 $registry = new ExtensionRegistry();
1404                 try {
1405                         $info = $registry->readFromQueue( $load );
1406                 } catch ( ExtensionDependencyError $e ) {
1407                         if ( $e->incompatibleCore || $e->incompatibleSkins
1408                                 || $e->incompatibleExtensions
1409                         ) {
1410                                 // If something is incompatible with a dependency, we have no real
1411                                 // option besides skipping it
1412                                 return Status::newFatal( 'config-extension-dependency',
1413                                         basename( dirname( $fullJsonFile ) ), $e->getMessage() );
1414                         } elseif ( $e->missingExtensions || $e->missingSkins ) {
1415                                 // There's an extension missing in the dependency tree,
1416                                 // so add those to the dependency list and try again
1417                                 return $this->readExtension(
1418                                         $fullJsonFile,
1419                                         array_merge( $extDeps, $e->missingExtensions ),
1420                                         array_merge( $skinDeps, $e->missingSkins )
1421                                 );
1422                         }
1423                         // Some other kind of dependency error?
1424                         return Status::newFatal( 'config-extension-dependency',
1425                                 basename( dirname( $fullJsonFile ) ), $e->getMessage() );
1426                 }
1427                 $ret = [];
1428                 // The order of credits will be the order of $load,
1429                 // so the first extension is the one we want to load,
1430                 // everything else is a dependency
1431                 $i = 0;
1432                 foreach ( $info['credits'] as $name => $credit ) {
1433                         $i++;
1434                         if ( $i == 1 ) {
1435                                 // Extension we want to load
1436                                 continue;
1437                         }
1438                         $type = basename( $credit['path'] ) === 'skin.json' ? 'skins' : 'extensions';
1439                         $ret['requires'][$type][] = $credit['name'];
1440                 }
1441                 $credits = array_values( $info['credits'] )[0];
1442                 if ( isset( $credits['url'] ) ) {
1443                         $ret['url'] = $credits['url'];
1444                 }
1445                 $ret['type'] = $credits['type'];
1446
1447                 return Status::newGood( $ret );
1448         }
1449
1450         /**
1451          * Returns a default value to be used for $wgDefaultSkin: normally the one set in DefaultSettings,
1452          * but will fall back to another if the default skin is missing and some other one is present
1453          * instead.
1454          *
1455          * @param string[] $skinNames Names of installed skins.
1456          * @return string
1457          */
1458         public function getDefaultSkin( array $skinNames ) {
1459                 $defaultSkin = $GLOBALS['wgDefaultSkin'];
1460                 if ( !$skinNames || in_array( $defaultSkin, $skinNames ) ) {
1461                         return $defaultSkin;
1462                 } else {
1463                         return $skinNames[0];
1464                 }
1465         }
1466
1467         /**
1468          * Installs the auto-detected extensions.
1469          *
1470          * @suppress SecurityCheck-OTHER It thinks $exts/$IP is user controlled but they are not.
1471          * @return Status
1472          */
1473         protected function includeExtensions() {
1474                 global $IP;
1475                 $exts = $this->getVar( '_Extensions' );
1476                 $IP = $this->getVar( 'IP' );
1477
1478                 // Marker for DatabaseUpdater::loadExtensions so we don't
1479                 // double load extensions
1480                 define( 'MW_EXTENSIONS_LOADED', true );
1481
1482                 /**
1483                  * We need to include DefaultSettings before including extensions to avoid
1484                  * warnings about unset variables. However, the only thing we really
1485                  * want here is $wgHooks['LoadExtensionSchemaUpdates']. This won't work
1486                  * if the extension has hidden hook registration in $wgExtensionFunctions,
1487                  * but we're not opening that can of worms
1488                  * @see https://phabricator.wikimedia.org/T28857
1489                  */
1490                 global $wgAutoloadClasses;
1491                 $wgAutoloadClasses = [];
1492                 $queue = [];
1493
1494                 require "$IP/includes/DefaultSettings.php";
1495
1496                 foreach ( $exts as $e ) {
1497                         if ( file_exists( "$IP/extensions/$e/extension.json" ) ) {
1498                                 $queue["$IP/extensions/$e/extension.json"] = 1;
1499                         } else {
1500                                 require_once "$IP/extensions/$e/$e.php";
1501                         }
1502                 }
1503
1504                 $registry = new ExtensionRegistry();
1505                 $data = $registry->readFromQueue( $queue );
1506                 $wgAutoloadClasses += $data['autoload'];
1507
1508                 // @phan-suppress-next-line PhanUndeclaredVariable $wgHooks is set by DefaultSettings
1509                 $hooksWeWant = $wgHooks['LoadExtensionSchemaUpdates'] ?? [];
1510
1511                 if ( isset( $data['globals']['wgHooks']['LoadExtensionSchemaUpdates'] ) ) {
1512                         $hooksWeWant = array_merge_recursive(
1513                                 $hooksWeWant,
1514                                 $data['globals']['wgHooks']['LoadExtensionSchemaUpdates']
1515                         );
1516                 }
1517                 // Unset everyone else's hooks. Lord knows what someone might be doing
1518                 // in ParserFirstCallInit (see T29171)
1519                 $GLOBALS['wgHooks'] = [ 'LoadExtensionSchemaUpdates' => $hooksWeWant ];
1520
1521                 return Status::newGood();
1522         }
1523
1524         /**
1525          * Get an array of install steps. Should always be in the format of
1526          * [
1527          *   'name'     => 'someuniquename',
1528          *   'callback' => [ $obj, 'method' ],
1529          * ]
1530          * There must be a config-install-$name message defined per step, which will
1531          * be shown on install.
1532          *
1533          * @param DatabaseInstaller $installer DatabaseInstaller so we can make callbacks
1534          * @return array
1535          */
1536         protected function getInstallSteps( DatabaseInstaller $installer ) {
1537                 $coreInstallSteps = [
1538                         [ 'name' => 'database', 'callback' => [ $installer, 'setupDatabase' ] ],
1539                         [ 'name' => 'tables', 'callback' => [ $installer, 'createTables' ] ],
1540                         [ 'name' => 'interwiki', 'callback' => [ $installer, 'populateInterwikiTable' ] ],
1541                         [ 'name' => 'stats', 'callback' => [ $this, 'populateSiteStats' ] ],
1542                         [ 'name' => 'keys', 'callback' => [ $this, 'generateKeys' ] ],
1543                         [ 'name' => 'updates', 'callback' => [ $installer, 'insertUpdateKeys' ] ],
1544                         [ 'name' => 'sysop', 'callback' => [ $this, 'createSysop' ] ],
1545                         [ 'name' => 'mainpage', 'callback' => [ $this, 'createMainpage' ] ],
1546                 ];
1547
1548                 // Build the array of install steps starting from the core install list,
1549                 // then adding any callbacks that wanted to attach after a given step
1550                 foreach ( $coreInstallSteps as $step ) {
1551                         $this->installSteps[] = $step;
1552                         if ( isset( $this->extraInstallSteps[$step['name']] ) ) {
1553                                 $this->installSteps = array_merge(
1554                                         $this->installSteps,
1555                                         $this->extraInstallSteps[$step['name']]
1556                                 );
1557                         }
1558                 }
1559
1560                 // Prepend any steps that want to be at the beginning
1561                 if ( isset( $this->extraInstallSteps['BEGINNING'] ) ) {
1562                         $this->installSteps = array_merge(
1563                                 $this->extraInstallSteps['BEGINNING'],
1564                                 $this->installSteps
1565                         );
1566                 }
1567
1568                 // Extensions should always go first, chance to tie into hooks and such
1569                 if ( count( $this->getVar( '_Extensions' ) ) ) {
1570                         array_unshift( $this->installSteps,
1571                                 [ 'name' => 'extensions', 'callback' => [ $this, 'includeExtensions' ] ]
1572                         );
1573                         $this->installSteps[] = [
1574                                 'name' => 'extension-tables',
1575                                 'callback' => [ $installer, 'createExtensionTables' ]
1576                         ];
1577                 }
1578
1579                 return $this->installSteps;
1580         }
1581
1582         /**
1583          * Actually perform the installation.
1584          *
1585          * @param callable $startCB A callback array for the beginning of each step
1586          * @param callable $endCB A callback array for the end of each step
1587          *
1588          * @return array Array of Status objects
1589          */
1590         public function performInstallation( $startCB, $endCB ) {
1591                 $installResults = [];
1592                 $installer = $this->getDBInstaller();
1593                 $installer->preInstall();
1594                 $steps = $this->getInstallSteps( $installer );
1595                 foreach ( $steps as $stepObj ) {
1596                         $name = $stepObj['name'];
1597                         call_user_func_array( $startCB, [ $name ] );
1598
1599                         // Perform the callback step
1600                         $status = call_user_func( $stepObj['callback'], $installer );
1601
1602                         // Output and save the results
1603                         call_user_func( $endCB, $name, $status );
1604                         $installResults[$name] = $status;
1605
1606                         // If we've hit some sort of fatal, we need to bail.
1607                         // Callback already had a chance to do output above.
1608                         if ( !$status->isOk() ) {
1609                                 break;
1610                         }
1611                 }
1612                 if ( $status->isOk() ) {
1613                         $this->showMessage(
1614                                 'config-install-db-success'
1615                         );
1616                         $this->setVar( '_InstallDone', true );
1617                 }
1618
1619                 return $installResults;
1620         }
1621
1622         /**
1623          * Generate $wgSecretKey. Will warn if we had to use an insecure random source.
1624          *
1625          * @return Status
1626          */
1627         public function generateKeys() {
1628                 $keys = [ 'wgSecretKey' => 64 ];
1629                 if ( strval( $this->getVar( 'wgUpgradeKey' ) ) === '' ) {
1630                         $keys['wgUpgradeKey'] = 16;
1631                 }
1632
1633                 return $this->doGenerateKeys( $keys );
1634         }
1635
1636         /**
1637          * Generate a secret value for variables using a secure generator.
1638          *
1639          * @param array $keys
1640          * @return Status
1641          */
1642         protected function doGenerateKeys( $keys ) {
1643                 $status = Status::newGood();
1644
1645                 foreach ( $keys as $name => $length ) {
1646                         $secretKey = MWCryptRand::generateHex( $length );
1647                         $this->setVar( $name, $secretKey );
1648                 }
1649
1650                 return $status;
1651         }
1652
1653         /**
1654          * Create the first user account, grant it sysop, bureaucrat and interface-admin rights
1655          *
1656          * @return Status
1657          */
1658         protected function createSysop() {
1659                 $name = $this->getVar( '_AdminName' );
1660                 $user = User::newFromName( $name );
1661
1662                 if ( !$user ) {
1663                         // We should've validated this earlier anyway!
1664                         return Status::newFatal( 'config-admin-error-user', $name );
1665                 }
1666
1667                 if ( $user->idForName() == 0 ) {
1668                         $user->addToDatabase();
1669
1670                         try {
1671                                 $user->setPassword( $this->getVar( '_AdminPassword' ) );
1672                         } catch ( PasswordError $pwe ) {
1673                                 return Status::newFatal( 'config-admin-error-password', $name, $pwe->getMessage() );
1674                         }
1675
1676                         $user->addGroup( 'sysop' );
1677                         $user->addGroup( 'bureaucrat' );
1678                         $user->addGroup( 'interface-admin' );
1679                         if ( $this->getVar( '_AdminEmail' ) ) {
1680                                 $user->setEmail( $this->getVar( '_AdminEmail' ) );
1681                         }
1682                         $user->saveSettings();
1683
1684                         // Update user count
1685                         $ssUpdate = SiteStatsUpdate::factory( [ 'users' => 1 ] );
1686                         $ssUpdate->doUpdate();
1687                 }
1688                 $status = Status::newGood();
1689
1690                 if ( $this->getVar( '_Subscribe' ) && $this->getVar( '_AdminEmail' ) ) {
1691                         $this->subscribeToMediaWikiAnnounce( $status );
1692                 }
1693
1694                 return $status;
1695         }
1696
1697         /**
1698          * @param Status $s
1699          */
1700         private function subscribeToMediaWikiAnnounce( Status $s ) {
1701                 $params = [
1702                         'email' => $this->getVar( '_AdminEmail' ),
1703                         'language' => 'en',
1704                         'digest' => 0
1705                 ];
1706
1707                 // Mailman doesn't support as many languages as we do, so check to make
1708                 // sure their selected language is available
1709                 $myLang = $this->getVar( '_UserLang' );
1710                 if ( in_array( $myLang, $this->mediaWikiAnnounceLanguages ) ) {
1711                         $myLang = $myLang == 'pt-br' ? 'pt_BR' : $myLang; // rewrite to Mailman's pt_BR
1712                         $params['language'] = $myLang;
1713                 }
1714
1715                 if ( MWHttpRequest::canMakeRequests() ) {
1716                         $res = MWHttpRequest::factory( $this->mediaWikiAnnounceUrl,
1717                                 [ 'method' => 'POST', 'postData' => $params ], __METHOD__ )->execute();
1718                         if ( !$res->isOK() ) {
1719                                 $s->warning( 'config-install-subscribe-fail', $res->getMessage() );
1720                         }
1721                 } else {
1722                         $s->warning( 'config-install-subscribe-notpossible' );
1723                 }
1724         }
1725
1726         /**
1727          * Insert Main Page with default content.
1728          *
1729          * @param DatabaseInstaller $installer
1730          * @return Status
1731          */
1732         protected function createMainpage( DatabaseInstaller $installer ) {
1733                 $status = Status::newGood();
1734                 $title = Title::newMainPage();
1735                 if ( $title->exists() ) {
1736                         $status->warning( 'config-install-mainpage-exists' );
1737                         return $status;
1738                 }
1739                 try {
1740                         $page = WikiPage::factory( $title );
1741                         $content = new WikitextContent(
1742                                 wfMessage( 'mainpagetext' )->inContentLanguage()->text() . "\n\n" .
1743                                 wfMessage( 'mainpagedocfooter' )->inContentLanguage()->text()
1744                         );
1745
1746                         $status = $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                 // Use PHP's built-in session handling, since MediaWiki's
1765                 // SessionHandler can't work before we have an object cache set up.
1766                 define( 'MW_NO_SESSION_HANDLER', 1 );
1767
1768                 // Don't access the database
1769                 $GLOBALS['wgUseDatabaseMessages'] = false;
1770                 // Don't cache langconv tables
1771                 $GLOBALS['wgLanguageConverterCacheType'] = CACHE_NONE;
1772                 // Debug-friendly
1773                 $GLOBALS['wgShowExceptionDetails'] = true;
1774                 $GLOBALS['wgShowHostnames'] = true;
1775                 // Don't break forms
1776                 $GLOBALS['wgExternalLinkTarget'] = '_blank';
1777
1778                 // Allow multiple ob_flush() calls
1779                 $GLOBALS['wgDisableOutputCompression'] = true;
1780
1781                 // Use a sensible cookie prefix (not my_wiki)
1782                 $GLOBALS['wgCookiePrefix'] = 'mw_installer';
1783
1784                 // Some of the environment checks make shell requests, remove limits
1785                 $GLOBALS['wgMaxShellMemory'] = 0;
1786
1787                 // Override the default CookieSessionProvider with a dummy
1788                 // implementation that won't stomp on PHP's cookies.
1789                 $GLOBALS['wgSessionProviders'] = [
1790                         [
1791                                 'class' => InstallerSessionProvider::class,
1792                                 'args' => [ [
1793                                         'priority' => 1,
1794                                 ] ]
1795                         ]
1796                 ];
1797
1798                 // Don't try to use any object cache for SessionManager either.
1799                 $GLOBALS['wgSessionCacheType'] = CACHE_NONE;
1800         }
1801
1802         /**
1803          * Add an installation step following the given step.
1804          *
1805          * @param callable $callback A valid installation callback array, in this form:
1806          *    [ 'name' => 'some-unique-name', 'callback' => [ $obj, 'function' ] ];
1807          * @param string $findStep The step to find. Omit to put the step at the beginning
1808          */
1809         public function addInstallStep( $callback, $findStep = 'BEGINNING' ) {
1810                 $this->extraInstallSteps[$findStep][] = $callback;
1811         }
1812
1813         /**
1814          * Disable the time limit for execution.
1815          * Some long-running pages (Install, Upgrade) will want to do this
1816          */
1817         protected function disableTimeLimit() {
1818                 Wikimedia\suppressWarnings();
1819                 set_time_limit( 0 );
1820                 Wikimedia\restoreWarnings();
1821         }
1822 }