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', '', "-\xE3\x80\x80-" );
 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                 # Get a list of available locales.
 994                 $result = Shell::command( '/usr/bin/locale', '-a' )
 995                         ->execute();
 996
 997                 if ( $result->getExitCode() != 0 ) {
 998                         return true;
 999                 }
1000
1001                 $lines = $result->getStdout();
1002                 $lines = array_map( 'trim', explode( "\n", $lines ) );
1003                 $candidatesByLocale = [];
1004                 $candidatesByLang = [];
1005                 foreach ( $lines as $line ) {
1006                         if ( $line === '' ) {
1007                                 continue;
1008                         }
1009
1010                         if ( !preg_match( '/^([a-zA-Z]+)(_[a-zA-Z]+|)\.(utf8|UTF-8)(@[a-zA-Z_]*|)$/i', $line, $m ) ) {
1011                                 continue;
1012                         }
1013
1014                         list( , $lang, , , ) = $m;
1015
1016                         $candidatesByLocale[$m[0]] = $m;
1017                         $candidatesByLang[$lang][] = $m;
1018                 }
1019
1020                 # Try the current value of LANG.
1021                 if ( isset( $candidatesByLocale[getenv( 'LANG' )] ) ) {
1022                         $this->setVar( 'wgShellLocale', getenv( 'LANG' ) );
1023
1024                         return true;
1025                 }
1026
1027                 # Try the most common ones.
1028                 $commonLocales = [ 'C.UTF-8', 'en_US.UTF-8', 'en_US.utf8', 'de_DE.UTF-8', 'de_DE.utf8' ];
1029                 foreach ( $commonLocales as $commonLocale ) {
1030                         if ( isset( $candidatesByLocale[$commonLocale] ) ) {
1031                                 $this->setVar( 'wgShellLocale', $commonLocale );
1032
1033                                 return true;
1034                         }
1035                 }
1036
1037                 # Is there an available locale in the Wiki's language?
1038                 $wikiLang = $this->getVar( 'wgLanguageCode' );
1039
1040                 if ( isset( $candidatesByLang[$wikiLang] ) ) {
1041                         $m = reset( $candidatesByLang[$wikiLang] );
1042                         $this->setVar( 'wgShellLocale', $m[0] );
1043
1044                         return true;
1045                 }
1046
1047                 # Are there any at all?
1048                 if ( count( $candidatesByLocale ) ) {
1049                         $m = reset( $candidatesByLocale );
1050                         $this->setVar( 'wgShellLocale', $m[0] );
1051
1052                         return true;
1053                 }
1054
1055                 # Give up.
1056                 return true;
1057         }
1058
1059         /**
1060          * Environment check for the permissions of the uploads directory
1061          * @return bool
1062          */
1063         protected function envCheckUploadsDirectory() {
1064                 global $IP;
1065
1066                 $dir = $IP . '/images/';
1067                 $url = $this->getVar( 'wgServer' ) . $this->getVar( 'wgScriptPath' ) . '/images/';
1068                 $safe = !$this->dirIsExecutable( $dir, $url );
1069
1070                 if ( !$safe ) {
1071                         $this->showMessage( 'config-uploads-not-safe', $dir );
1072                 }
1073
1074                 return true;
1075         }
1076
1077         /**
1078          * Checks if suhosin.get.max_value_length is set, and if so generate
1079          * a warning because it decreases ResourceLoader performance.
1080          * @return bool
1081          */
1082         protected function envCheckSuhosinMaxValueLength() {
1083                 $maxValueLength = ini_get( 'suhosin.get.max_value_length' );
1084                 if ( $maxValueLength > 0 && $maxValueLength < 1024 ) {
1085                         // Only warn if the value is below the sane 1024
1086                         $this->showMessage( 'config-suhosin-max-value-length', $maxValueLength );
1087                 }
1088
1089                 return true;
1090         }
1091
1092         /**
1093          * Checks if we're running on 64 bit or not. 32 bit is becoming increasingly
1094          * hard to support, so let's at least warn people.
1095          *
1096          * @return bool
1097          */
1098         protected function envCheck64Bit() {
1099                 if ( PHP_INT_SIZE == 4 ) {
1100                         $this->showMessage( 'config-using-32bit' );
1101                 }
1102
1103                 return true;
1104         }
1105
1106         /**
1107          * Convert a hex string representing a Unicode code point to that code point.
1108          * @param string $c
1109          * @return string|false
1110          */
1111         protected function unicodeChar( $c ) {
1112                 $c = hexdec( $c );
1113                 if ( $c <= 0x7F ) {
1114                         return chr( $c );
1115                 } elseif ( $c <= 0x7FF ) {
1116                         return chr( 0xC0 | $c >> 6 ) . chr( 0x80 | $c & 0x3F );
1117                 } elseif ( $c <= 0xFFFF ) {
1118                         return chr( 0xE0 | $c >> 12 ) . chr( 0x80 | $c >> 6 & 0x3F ) .
1119                                 chr( 0x80 | $c & 0x3F );
1120                 } elseif ( $c <= 0x10FFFF ) {
1121                         return chr( 0xF0 | $c >> 18 ) . chr( 0x80 | $c >> 12 & 0x3F ) .
1122                                 chr( 0x80 | $c >> 6 & 0x3F ) .
1123                                 chr( 0x80 | $c & 0x3F );
1124                 } else {
1125                         return false;
1126                 }
1127         }
1128
1129         /**
1130          * Check the libicu version
1131          */
1132         protected function envCheckLibicu() {
1133                 /**
1134                  * This needs to be updated something that the latest libicu
1135                  * will properly normalize.  This normalization was found at
1136                  * http://www.unicode.org/versions/Unicode5.2.0/#Character_Additions
1137                  * Note that we use the hex representation to create the code
1138                  * points in order to avoid any Unicode-destroying during transit.
1139                  */
1140                 $not_normal_c = $this->unicodeChar( "FA6C" );
1141                 $normal_c = $this->unicodeChar( "242EE" );
1142
1143                 $useNormalizer = 'php';
1144                 $needsUpdate = false;
1145
1146                 if ( function_exists( 'normalizer_normalize' ) ) {
1147                         $useNormalizer = 'intl';
1148                         $intl = normalizer_normalize( $not_normal_c, Normalizer::FORM_C );
1149                         if ( $intl !== $normal_c ) {
1150                                 $needsUpdate = true;
1151                         }
1152                 }
1153
1154                 // Uses messages 'config-unicode-using-php' and 'config-unicode-using-intl'
1155                 if ( $useNormalizer === 'php' ) {
1156                         $this->showMessage( 'config-unicode-pure-php-warning' );
1157                 } else {
1158                         $this->showMessage( 'config-unicode-using-' . $useNormalizer );
1159                         if ( $needsUpdate ) {
1160                                 $this->showMessage( 'config-unicode-update-warning' );
1161                         }
1162                 }
1163         }
1164
1165         /**
1166          * Environment prep for the server hostname.
1167          */
1168         protected function envPrepServer() {
1169                 $server = $this->envGetDefaultServer();
1170                 if ( $server !== null ) {
1171                         $this->setVar( 'wgServer', $server );
1172                 }
1173         }
1174
1175         /**
1176          * Helper function to be called from envPrepServer()
1177          * @return string
1178          */
1179         abstract protected function envGetDefaultServer();
1180
1181         /**
1182          * Environment prep for setting $IP and $wgScriptPath.
1183          */
1184         protected function envPrepPath() {
1185                 global $IP;
1186                 $IP = dirname( dirname( __DIR__ ) );
1187                 $this->setVar( 'IP', $IP );
1188         }
1189
1190         /**
1191          * Checks if scripts located in the given directory can be executed via the given URL.
1192          *
1193          * Used only by environment checks.
1194          * @param string $dir
1195          * @param string $url
1196          * @return bool|int|string
1197          */
1198         public function dirIsExecutable( $dir, $url ) {
1199                 $scriptTypes = [
1200                         'php' => [
1201                                 "<?php echo 'ex' . 'ec';",
1202                                 "#!/var/env php5\n<?php echo 'ex' . 'ec';",
1203                         ],
1204                 ];
1205
1206                 // it would be good to check other popular languages here, but it'll be slow.
1207
1208                 Wikimedia\suppressWarnings();
1209
1210                 foreach ( $scriptTypes as $ext => $contents ) {
1211                         foreach ( $contents as $source ) {
1212                                 $file = 'exectest.' . $ext;
1213
1214                                 if ( !file_put_contents( $dir . $file, $source ) ) {
1215                                         break;
1216                                 }
1217
1218                                 try {
1219                                         $text = Http::get( $url . $file, [ 'timeout' => 3 ], __METHOD__ );
1220                                 } catch ( Exception $e ) {
1221                                         // Http::get throws with allow_url_fopen = false and no curl extension.
1222                                         $text = null;
1223                                 }
1224                                 unlink( $dir . $file );
1225
1226                                 if ( $text == 'exec' ) {
1227                                         Wikimedia\restoreWarnings();
1228
1229                                         return $ext;
1230                                 }
1231                         }
1232                 }
1233
1234                 Wikimedia\restoreWarnings();
1235
1236                 return false;
1237         }
1238
1239         /**
1240          * Checks for presence of an Apache module. Works only if PHP is running as an Apache module, too.
1241          *
1242          * @param string $moduleName Name of module to check.
1243          * @return bool
1244          */
1245         public static function apacheModulePresent( $moduleName ) {
1246                 if ( function_exists( 'apache_get_modules' ) && in_array( $moduleName, apache_get_modules() ) ) {
1247                         return true;
1248                 }
1249                 // try it the hard way
1250                 ob_start();
1251                 phpinfo( INFO_MODULES );
1252                 $info = ob_get_clean();
1253
1254                 return strpos( $info, $moduleName ) !== false;
1255         }
1256
1257         /**
1258          * ParserOptions are constructed before we determined the language, so fix it
1259          *
1260          * @param Language $lang
1261          */
1262         public function setParserLanguage( $lang ) {
1263                 $this->parserOptions->setTargetLanguage( $lang );
1264                 $this->parserOptions->setUserLang( $lang );
1265         }
1266
1267         /**
1268          * Overridden by WebInstaller to provide lastPage parameters.
1269          * @param string $page
1270          * @return string
1271          */
1272         protected function getDocUrl( $page ) {
1273                 return "{$_SERVER['PHP_SELF']}?page=" . urlencode( $page );
1274         }
1275
1276         /**
1277          * Finds extensions that follow the format /$directory/Name/Name.php,
1278          * and returns an array containing the value for 'Name' for each found extension.
1279          *
1280          * Reasonable values for $directory include 'extensions' (the default) and 'skins'.
1281          *
1282          * @param string $directory Directory to search in
1283          * @return array [ $extName => [ 'screenshots' => [ '...' ] ]
1284          */
1285         public function findExtensions( $directory = 'extensions' ) {
1286                 if ( $this->getVar( 'IP' ) === null ) {
1287                         return [];
1288                 }
1289
1290                 $extDir = $this->getVar( 'IP' ) . '/' . $directory;
1291                 if ( !is_readable( $extDir ) || !is_dir( $extDir ) ) {
1292                         return [];
1293                 }
1294
1295                 // extensions -> extension.json, skins -> skin.json
1296                 $jsonFile = substr( $directory, 0, strlen( $directory ) - 1 ) . '.json';
1297
1298                 $dh = opendir( $extDir );
1299                 $exts = [];
1300                 while ( ( $file = readdir( $dh ) ) !== false ) {
1301                         if ( !is_dir( "$extDir/$file" ) ) {
1302                                 continue;
1303                         }
1304                         $fullJsonFile = "$extDir/$file/$jsonFile";
1305                         $isJson = file_exists( $fullJsonFile );
1306                         $isPhp = false;
1307                         if ( !$isJson ) {
1308                                 // Only fallback to PHP file if JSON doesn't exist
1309                                 $fullPhpFile = "$extDir/$file/$file.php";
1310                                 $isPhp = file_exists( $fullPhpFile );
1311                         }
1312                         if ( $isJson || $isPhp ) {
1313                                 // Extension exists. Now see if there are screenshots
1314                                 $exts[$file] = [];
1315                                 if ( is_dir( "$extDir/$file/screenshots" ) ) {
1316                                         $paths = glob( "$extDir/$file/screenshots/*.png" );
1317                                         foreach ( $paths as $path ) {
1318                                                 $exts[$file]['screenshots'][] = str_replace( $extDir, "../$directory", $path );
1319                                         }
1320
1321                                 }
1322                         }
1323                         if ( $isJson ) {
1324                                 $info = $this->readExtension( $fullJsonFile );
1325                                 if ( $info === false ) {
1326                                         continue;
1327                                 }
1328                                 $exts[$file] += $info;
1329                         }
1330                 }
1331                 closedir( $dh );
1332                 uksort( $exts, 'strnatcasecmp' );
1333
1334                 return $exts;
1335         }
1336
1337         /**
1338          * @param string $fullJsonFile
1339          * @param array $extDeps
1340          * @param array $skinDeps
1341          *
1342          * @return array|bool False if this extension can't be loaded
1343          */
1344         private function readExtension( $fullJsonFile, $extDeps = [], $skinDeps = [] ) {
1345                 $load = [
1346                         $fullJsonFile => 1
1347                 ];
1348                 if ( $extDeps ) {
1349                         $extDir = $this->getVar( 'IP' ) . '/extensions';
1350                         foreach ( $extDeps as $dep ) {
1351                                 $fname = "$extDir/$dep/extension.json";
1352                                 if ( !file_exists( $fname ) ) {
1353                                         return false;
1354                                 }
1355                                 $load[$fname] = 1;
1356                         }
1357                 }
1358                 if ( $skinDeps ) {
1359                         $skinDir = $this->getVar( 'IP' ) . '/skins';
1360                         foreach ( $skinDeps as $dep ) {
1361                                 $fname = "$skinDir/$dep/skin.json";
1362                                 if ( !file_exists( $fname ) ) {
1363                                         return false;
1364                                 }
1365                                 $load[$fname] = 1;
1366                         }
1367                 }
1368                 $registry = new ExtensionRegistry();
1369                 try {
1370                         $info = $registry->readFromQueue( $load );
1371                 } catch ( ExtensionDependencyError $e ) {
1372                         if ( $e->incompatibleCore || $e->incompatibleSkins
1373                                 || $e->incompatibleExtensions
1374                         ) {
1375                                 // If something is incompatible with a dependency, we have no real
1376                                 // option besides skipping it
1377                                 return false;
1378                         } elseif ( $e->missingExtensions || $e->missingSkins ) {
1379                                 // There's an extension missing in the dependency tree,
1380                                 // so add those to the dependency list and try again
1381                                 return $this->readExtension(
1382                                         $fullJsonFile,
1383                                         array_merge( $extDeps, $e->missingExtensions ),
1384                                         array_merge( $skinDeps, $e->missingSkins )
1385                                 );
1386                         }
1387                         // Some other kind of dependency error?
1388                         return false;
1389                 }
1390                 $ret = [];
1391                 // The order of credits will be the order of $load,
1392                 // so the first extension is the one we want to load,
1393                 // everything else is a dependency
1394                 $i = 0;
1395                 foreach ( $info['credits'] as $name => $credit ) {
1396                         $i++;
1397                         if ( $i == 1 ) {
1398                                 // Extension we want to load
1399                                 continue;
1400                         }
1401                         $type = basename( $credit['path'] ) === 'skin.json' ? 'skins' : 'extensions';
1402                         $ret['requires'][$type][] = $credit['name'];
1403                 }
1404                 $credits = array_values( $info['credits'] )[0];
1405                 if ( isset( $credits['url'] ) ) {
1406                         $ret['url'] = $credits['url'];
1407                 }
1408                 $ret['type'] = $credits['type'];
1409
1410                 return $ret;
1411         }
1412
1413         /**
1414          * Returns a default value to be used for $wgDefaultSkin: normally the one set in DefaultSettings,
1415          * but will fall back to another if the default skin is missing and some other one is present
1416          * instead.
1417          *
1418          * @param string[] $skinNames Names of installed skins.
1419          * @return string
1420          */
1421         public function getDefaultSkin( array $skinNames ) {
1422                 $defaultSkin = $GLOBALS['wgDefaultSkin'];
1423                 if ( !$skinNames || in_array( $defaultSkin, $skinNames ) ) {
1424                         return $defaultSkin;
1425                 } else {
1426                         return $skinNames[0];
1427                 }
1428         }
1429
1430         /**
1431          * Installs the auto-detected extensions.
1432          *
1433          * @return Status
1434          */
1435         protected function includeExtensions() {
1436                 global $IP;
1437                 $exts = $this->getVar( '_Extensions' );
1438                 $IP = $this->getVar( 'IP' );
1439
1440                 // Marker for DatabaseUpdater::loadExtensions so we don't
1441                 // double load extensions
1442                 define( 'MW_EXTENSIONS_LOADED', true );
1443
1444                 /**
1445                  * We need to include DefaultSettings before including extensions to avoid
1446                  * warnings about unset variables. However, the only thing we really
1447                  * want here is $wgHooks['LoadExtensionSchemaUpdates']. This won't work
1448                  * if the extension has hidden hook registration in $wgExtensionFunctions,
1449                  * but we're not opening that can of worms
1450                  * @see https://phabricator.wikimedia.org/T28857
1451                  */
1452                 global $wgAutoloadClasses;
1453                 $wgAutoloadClasses = [];
1454                 $queue = [];
1455
1456                 require "$IP/includes/DefaultSettings.php";
1457
1458                 foreach ( $exts as $e ) {
1459                         if ( file_exists( "$IP/extensions/$e/extension.json" ) ) {
1460                                 $queue["$IP/extensions/$e/extension.json"] = 1;
1461                         } else {
1462                                 require_once "$IP/extensions/$e/$e.php";
1463                         }
1464                 }
1465
1466                 $registry = new ExtensionRegistry();
1467                 $data = $registry->readFromQueue( $queue );
1468                 $wgAutoloadClasses += $data['autoload'];
1469
1470                 $hooksWeWant = isset( $wgHooks['LoadExtensionSchemaUpdates'] ) ?
1471                         /** @suppress PhanUndeclaredVariable $wgHooks is set by DefaultSettings */
1472                         $wgHooks['LoadExtensionSchemaUpdates'] : [];
1473
1474                 if ( isset( $data['globals']['wgHooks']['LoadExtensionSchemaUpdates'] ) ) {
1475                         $hooksWeWant = array_merge_recursive(
1476                                 $hooksWeWant,
1477                                 $data['globals']['wgHooks']['LoadExtensionSchemaUpdates']
1478                         );
1479                 }
1480                 // Unset everyone else's hooks. Lord knows what someone might be doing
1481                 // in ParserFirstCallInit (see T29171)
1482                 $GLOBALS['wgHooks'] = [ 'LoadExtensionSchemaUpdates' => $hooksWeWant ];
1483
1484                 return Status::newGood();
1485         }
1486
1487         /**
1488          * Get an array of install steps. Should always be in the format of
1489          * [
1490          *   'name'     => 'someuniquename',
1491          *   'callback' => [ $obj, 'method' ],
1492          * ]
1493          * There must be a config-install-$name message defined per step, which will
1494          * be shown on install.
1495          *
1496          * @param DatabaseInstaller $installer DatabaseInstaller so we can make callbacks
1497          * @return array
1498          */
1499         protected function getInstallSteps( DatabaseInstaller $installer ) {
1500                 $coreInstallSteps = [
1501                         [ 'name' => 'database', 'callback' => [ $installer, 'setupDatabase' ] ],
1502                         [ 'name' => 'tables', 'callback' => [ $installer, 'createTables' ] ],
1503                         [ 'name' => 'interwiki', 'callback' => [ $installer, 'populateInterwikiTable' ] ],
1504                         [ 'name' => 'stats', 'callback' => [ $this, 'populateSiteStats' ] ],
1505                         [ 'name' => 'keys', 'callback' => [ $this, 'generateKeys' ] ],
1506                         [ 'name' => 'updates', 'callback' => [ $installer, 'insertUpdateKeys' ] ],
1507                         [ 'name' => 'sysop', 'callback' => [ $this, 'createSysop' ] ],
1508                         [ 'name' => 'mainpage', 'callback' => [ $this, 'createMainpage' ] ],
1509                 ];
1510
1511                 // Build the array of install steps starting from the core install list,
1512                 // then adding any callbacks that wanted to attach after a given step
1513                 foreach ( $coreInstallSteps as $step ) {
1514                         $this->installSteps[] = $step;
1515                         if ( isset( $this->extraInstallSteps[$step['name']] ) ) {
1516                                 $this->installSteps = array_merge(
1517                                         $this->installSteps,
1518                                         $this->extraInstallSteps[$step['name']]
1519                                 );
1520                         }
1521                 }
1522
1523                 // Prepend any steps that want to be at the beginning
1524                 if ( isset( $this->extraInstallSteps['BEGINNING'] ) ) {
1525                         $this->installSteps = array_merge(
1526                                 $this->extraInstallSteps['BEGINNING'],
1527                                 $this->installSteps
1528                         );
1529                 }
1530
1531                 // Extensions should always go first, chance to tie into hooks and such
1532                 if ( count( $this->getVar( '_Extensions' ) ) ) {
1533                         array_unshift( $this->installSteps,
1534                                 [ 'name' => 'extensions', 'callback' => [ $this, 'includeExtensions' ] ]
1535                         );
1536                         $this->installSteps[] = [
1537                                 'name' => 'extension-tables',
1538                                 'callback' => [ $installer, 'createExtensionTables' ]
1539                         ];
1540                 }
1541
1542                 return $this->installSteps;
1543         }
1544
1545         /**
1546          * Actually perform the installation.
1547          *
1548          * @param callable $startCB A callback array for the beginning of each step
1549          * @param callable $endCB A callback array for the end of each step
1550          *
1551          * @return array Array of Status objects
1552          */
1553         public function performInstallation( $startCB, $endCB ) {
1554                 $installResults = [];
1555                 $installer = $this->getDBInstaller();
1556                 $installer->preInstall();
1557                 $steps = $this->getInstallSteps( $installer );
1558                 foreach ( $steps as $stepObj ) {
1559                         $name = $stepObj['name'];
1560                         call_user_func_array( $startCB, [ $name ] );
1561
1562                         // Perform the callback step
1563                         $status = call_user_func( $stepObj['callback'], $installer );
1564
1565                         // Output and save the results
1566                         call_user_func( $endCB, $name, $status );
1567                         $installResults[$name] = $status;
1568
1569                         // If we've hit some sort of fatal, we need to bail.
1570                         // Callback already had a chance to do output above.
1571                         if ( !$status->isOk() ) {
1572                                 break;
1573                         }
1574                 }
1575                 if ( $status->isOk() ) {
1576                         $this->showMessage(
1577                                 'config-install-success',
1578                                 $this->getVar( 'wgServer' ),
1579                                 $this->getVar( 'wgScriptPath' )
1580                         );
1581                         $this->setVar( '_InstallDone', true );
1582                 }
1583
1584                 return $installResults;
1585         }
1586
1587         /**
1588          * Generate $wgSecretKey. Will warn if we had to use an insecure random source.
1589          *
1590          * @return Status
1591          */
1592         public function generateKeys() {
1593                 $keys = [ 'wgSecretKey' => 64 ];
1594                 if ( strval( $this->getVar( 'wgUpgradeKey' ) ) === '' ) {
1595                         $keys['wgUpgradeKey'] = 16;
1596                 }
1597
1598                 return $this->doGenerateKeys( $keys );
1599         }
1600
1601         /**
1602          * Generate a secret value for variables using our CryptRand generator.
1603          * Produce a warning if the random source was insecure.
1604          *
1605          * @param array $keys
1606          * @return Status
1607          */
1608         protected function doGenerateKeys( $keys ) {
1609                 $status = Status::newGood();
1610
1611                 $strong = true;
1612                 foreach ( $keys as $name => $length ) {
1613                         $secretKey = MWCryptRand::generateHex( $length, true );
1614                         if ( !MWCryptRand::wasStrong() ) {
1615                                 $strong = false;
1616                         }
1617
1618                         $this->setVar( $name, $secretKey );
1619                 }
1620
1621                 if ( !$strong ) {
1622                         $names = array_keys( $keys );
1623                         $names = preg_replace( '/^(.*)$/', '\$$1', $names );
1624                         global $wgLang;
1625                         $status->warning( 'config-insecure-keys', $wgLang->listToText( $names ), count( $names ) );
1626                 }
1627
1628                 return $status;
1629         }
1630
1631         /**
1632          * Create the first user account, grant it sysop and bureaucrat rights
1633          *
1634          * @return Status
1635          */
1636         protected function createSysop() {
1637                 $name = $this->getVar( '_AdminName' );
1638                 $user = User::newFromName( $name );
1639
1640                 if ( !$user ) {
1641                         // We should've validated this earlier anyway!
1642                         return Status::newFatal( 'config-admin-error-user', $name );
1643                 }
1644
1645                 if ( $user->idForName() == 0 ) {
1646                         $user->addToDatabase();
1647
1648                         try {
1649                                 $user->setPassword( $this->getVar( '_AdminPassword' ) );
1650                         } catch ( PasswordError $pwe ) {
1651                                 return Status::newFatal( 'config-admin-error-password', $name, $pwe->getMessage() );
1652                         }
1653
1654                         $user->addGroup( 'sysop' );
1655                         $user->addGroup( 'bureaucrat' );
1656                         if ( $this->getVar( '_AdminEmail' ) ) {
1657                                 $user->setEmail( $this->getVar( '_AdminEmail' ) );
1658                         }
1659                         $user->saveSettings();
1660
1661                         // Update user count
1662                         $ssUpdate = SiteStatsUpdate::factory( [ 'users' => 1 ] );
1663                         $ssUpdate->doUpdate();
1664                 }
1665                 $status = Status::newGood();
1666
1667                 if ( $this->getVar( '_Subscribe' ) && $this->getVar( '_AdminEmail' ) ) {
1668                         $this->subscribeToMediaWikiAnnounce( $status );
1669                 }
1670
1671                 return $status;
1672         }
1673
1674         /**
1675          * @param Status $s
1676          */
1677         private function subscribeToMediaWikiAnnounce( Status $s ) {
1678                 $params = [
1679                         'email' => $this->getVar( '_AdminEmail' ),
1680                         'language' => 'en',
1681                         'digest' => 0
1682                 ];
1683
1684                 // Mailman doesn't support as many languages as we do, so check to make
1685                 // sure their selected language is available
1686                 $myLang = $this->getVar( '_UserLang' );
1687                 if ( in_array( $myLang, $this->mediaWikiAnnounceLanguages ) ) {
1688                         $myLang = $myLang == 'pt-br' ? 'pt_BR' : $myLang; // rewrite to Mailman's pt_BR
1689                         $params['language'] = $myLang;
1690                 }
1691
1692                 if ( MWHttpRequest::canMakeRequests() ) {
1693                         $res = MWHttpRequest::factory( $this->mediaWikiAnnounceUrl,
1694                                 [ 'method' => 'POST', 'postData' => $params ], __METHOD__ )->execute();
1695                         if ( !$res->isOK() ) {
1696                                 $s->warning( 'config-install-subscribe-fail', $res->getMessage() );
1697                         }
1698                 } else {
1699                         $s->warning( 'config-install-subscribe-notpossible' );
1700                 }
1701         }
1702
1703         /**
1704          * Insert Main Page with default content.
1705          *
1706          * @param DatabaseInstaller $installer
1707          * @return Status
1708          */
1709         protected function createMainpage( DatabaseInstaller $installer ) {
1710                 $status = Status::newGood();
1711                 $title = Title::newMainPage();
1712                 if ( $title->exists() ) {
1713                         $status->warning( 'config-install-mainpage-exists' );
1714                         return $status;
1715                 }
1716                 try {
1717                         $page = WikiPage::factory( $title );
1718                         $content = new WikitextContent(
1719                                 wfMessage( 'mainpagetext' )->inContentLanguage()->text() . "\n\n" .
1720                                 wfMessage( 'mainpagedocfooter' )->inContentLanguage()->text()
1721                         );
1722
1723                         $status = $page->doEditContent( $content,
1724                                 '',
1725                                 EDIT_NEW,
1726                                 false,
1727                                 User::newFromName( 'MediaWiki default' )
1728                         );
1729                 } catch ( Exception $e ) {
1730                         // using raw, because $wgShowExceptionDetails can not be set yet
1731                         $status->fatal( 'config-install-mainpage-failed', $e->getMessage() );
1732                 }
1733
1734                 return $status;
1735         }
1736
1737         /**
1738          * Override the necessary bits of the config to run an installation.
1739          */
1740         public static function overrideConfig() {
1741                 // Use PHP's built-in session handling, since MediaWiki's
1742                 // SessionHandler can't work before we have an object cache set up.
1743                 define( 'MW_NO_SESSION_HANDLER', 1 );
1744
1745                 // Don't access the database
1746                 $GLOBALS['wgUseDatabaseMessages'] = false;
1747                 // Don't cache langconv tables
1748                 $GLOBALS['wgLanguageConverterCacheType'] = CACHE_NONE;
1749                 // Debug-friendly
1750                 $GLOBALS['wgShowExceptionDetails'] = true;
1751                 // Don't break forms
1752                 $GLOBALS['wgExternalLinkTarget'] = '_blank';
1753
1754                 // Extended debugging
1755                 $GLOBALS['wgShowSQLErrors'] = true;
1756                 $GLOBALS['wgShowDBErrorBacktrace'] = true;
1757
1758                 // Allow multiple ob_flush() calls
1759                 $GLOBALS['wgDisableOutputCompression'] = true;
1760
1761                 // Use a sensible cookie prefix (not my_wiki)
1762                 $GLOBALS['wgCookiePrefix'] = 'mw_installer';
1763
1764                 // Some of the environment checks make shell requests, remove limits
1765                 $GLOBALS['wgMaxShellMemory'] = 0;
1766
1767                 // Override the default CookieSessionProvider with a dummy
1768                 // implementation that won't stomp on PHP's cookies.
1769                 $GLOBALS['wgSessionProviders'] = [
1770                         [
1771                                 'class' => InstallerSessionProvider::class,
1772                                 'args' => [ [
1773                                         'priority' => 1,
1774                                 ] ]
1775                         ]
1776                 ];
1777
1778                 // Don't try to use any object cache for SessionManager either.
1779                 $GLOBALS['wgSessionCacheType'] = CACHE_NONE;
1780         }
1781
1782         /**
1783          * Add an installation step following the given step.
1784          *
1785          * @param callable $callback A valid installation callback array, in this form:
1786          *    [ 'name' => 'some-unique-name', 'callback' => [ $obj, 'function' ] ];
1787          * @param string $findStep The step to find. Omit to put the step at the beginning
1788          */
1789         public function addInstallStep( $callback, $findStep = 'BEGINNING' ) {
1790                 $this->extraInstallSteps[$findStep][] = $callback;
1791         }
1792
1793         /**
1794          * Disable the time limit for execution.
1795          * Some long-running pages (Install, Upgrade) will want to do this
1796          */
1797         protected function disableTimeLimit() {
1798                 Wikimedia\suppressWarnings();
1799                 set_time_limit( 0 );
1800                 Wikimedia\restoreWarnings();
1801         }
1802 }