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
  28 /**
  29  * This documentation group collects source code files with deployment functionality.
  30  *
  31  * @defgroup Deployment Deployment
  32  */
  33
  34 /**
  35  * Base installer class.
  36  *
  37  * This class provides the base for installation and update functionality
  38  * for both MediaWiki core and extensions.
  39  *
  40  * @ingroup Deployment
  41  * @since 1.17
  42  */
  43 abstract class Installer {
  44
  45         /**
  46          * The oldest version of PCRE we can support.
  47          *
  48          * Defining this is necessary because PHP may be linked with a system version
  49          * of PCRE, which may be older than that bundled with the minimum PHP version.
  50          */
  51         const MINIMUM_PCRE_VERSION = '7.2';
  52
  53         /**
  54          * @var array
  55          */
  56         protected $settings;
  57
  58         /**
  59          * List of detected DBs, access using getCompiledDBs().
  60          *
  61          * @var array
  62          */
  63         protected $compiledDBs;
  64
  65         /**
  66          * Cached DB installer instances, access using getDBInstaller().
  67          *
  68          * @var array
  69          */
  70         protected $dbInstallers = [];
  71
  72         /**
  73          * Minimum memory size in MB.
  74          *
  75          * @var int
  76          */
  77         protected $minMemorySize = 50;
  78
  79         /**
  80          * Cached Title, used by parse().
  81          *
  82          * @var Title
  83          */
  84         protected $parserTitle;
  85
  86         /**
  87          * Cached ParserOptions, used by parse().
  88          *
  89          * @var ParserOptions
  90          */
  91         protected $parserOptions;
  92
  93         /**
  94          * Known database types. These correspond to the class names <type>Installer,
  95          * and are also MediaWiki database types valid for $wgDBtype.
  96          *
  97          * To add a new type, create a <type>Installer class and a Database<type>
  98          * class, and add a config-type-<type> message to MessagesEn.php.
  99          *
 100          * @var array
 101          */
 102         protected static $dbTypes = [
 103                 'mysql',
 104                 'postgres',
 105                 'oracle',
 106                 'mssql',
 107                 'sqlite',
 108         ];
 109
 110         /**
 111          * A list of environment check methods called by doEnvironmentChecks().
 112          * These may output warnings using showMessage(), and/or abort the
 113          * installation process by returning false.
 114          *
 115          * For the WebInstaller these are only called on the Welcome page,
 116          * if these methods have side-effects that should affect later page loads
 117          * (as well as the generated stylesheet), use envPreps instead.
 118          *
 119          * @var array
 120          */
 121         protected $envChecks = [
 122                 'envCheckDB',
 123                 'envCheckBrokenXML',
 124                 'envCheckPCRE',
 125                 'envCheckMemory',
 126                 'envCheckCache',
 127                 'envCheckModSecurity',
 128                 'envCheckDiff3',
 129                 'envCheckGraphics',
 130                 'envCheckGit',
 131                 'envCheckServer',
 132                 'envCheckPath',
 133                 'envCheckShellLocale',
 134                 'envCheckUploadsDirectory',
 135                 'envCheckLibicu',
 136                 'envCheckSuhosinMaxValueLength',
 137                 'envCheck64Bit',
 138         ];
 139
 140         /**
 141          * A list of environment preparation methods called by doEnvironmentPreps().
 142          *
 143          * @var array
 144          */
 145         protected $envPreps = [
 146                 'envPrepServer',
 147                 'envPrepPath',
 148         ];
 149
 150         /**
 151          * MediaWiki configuration globals that will eventually be passed through
 152          * to LocalSettings.php. The names only are given here, the defaults
 153          * typically come from DefaultSettings.php.
 154          *
 155          * @var array
 156          */
 157         protected $defaultVarNames = [
 158                 'wgSitename',
 159                 'wgPasswordSender',
 160                 'wgLanguageCode',
 161                 'wgRightsIcon',
 162                 'wgRightsText',
 163                 'wgRightsUrl',
 164                 'wgEnableEmail',
 165                 'wgEnableUserEmail',
 166                 'wgEnotifUserTalk',
 167                 'wgEnotifWatchlist',
 168                 'wgEmailAuthentication',
 169                 'wgDBname',
 170                 'wgDBtype',
 171                 'wgDiff3',
 172                 'wgImageMagickConvertCommand',
 173                 'wgGitBin',
 174                 'IP',
 175                 'wgScriptPath',
 176                 'wgMetaNamespace',
 177                 'wgDeletedDirectory',
 178                 'wgEnableUploads',
 179                 'wgShellLocale',
 180                 'wgSecretKey',
 181                 'wgUseInstantCommons',
 182                 'wgUpgradeKey',
 183                 'wgDefaultSkin',
 184                 'wgPingback',
 185         ];
 186
 187         /**
 188          * Variables that are stored alongside globals, and are used for any
 189          * configuration of the installation process aside from the MediaWiki
 190          * configuration. Map of names to defaults.
 191          *
 192          * @var array
 193          */
 194         protected $internalDefaults = [
 195                 '_UserLang' => 'en',
 196                 '_Environment' => false,
 197                 '_RaiseMemory' => false,
 198                 '_UpgradeDone' => false,
 199                 '_InstallDone' => false,
 200                 '_Caches' => [],
 201                 '_InstallPassword' => '',
 202                 '_SameAccount' => true,
 203                 '_CreateDBAccount' => false,
 204                 '_NamespaceType' => 'site-name',
 205                 '_AdminName' => '', // will be set later, when the user selects language
 206                 '_AdminPassword' => '',
 207                 '_AdminPasswordConfirm' => '',
 208                 '_AdminEmail' => '',
 209                 '_Subscribe' => false,
 210                 '_SkipOptional' => 'continue',
 211                 '_RightsProfile' => 'wiki',
 212                 '_LicenseCode' => 'none',
 213                 '_CCDone' => false,
 214                 '_Extensions' => [],
 215                 '_Skins' => [],
 216                 '_MemCachedServers' => '',
 217                 '_UpgradeKeySupplied' => false,
 218                 '_ExistingDBSettings' => false,
 219
 220                 // $wgLogo is probably wrong (T50084); set something that will work.
 221                 // Single quotes work fine here, as LocalSettingsGenerator outputs this unescaped.
 222                 'wgLogo' => '$wgResourceBasePath/resources/assets/wiki.png',
 223                 'wgAuthenticationTokenVersion' => 1,
 224         ];
 225
 226         /**
 227          * The actual list of installation steps. This will be initialized by getInstallSteps()
 228          *
 229          * @var array
 230          */
 231         private $installSteps = [];
 232
 233         /**
 234          * Extra steps for installation, for things like DatabaseInstallers to modify
 235          *
 236          * @var array
 237          */
 238         protected $extraInstallSteps = [];
 239
 240         /**
 241          * Known object cache types and the functions used to test for their existence.
 242          *
 243          * @var array
 244          */
 245         protected $objectCaches = [
 246                 'xcache' => 'xcache_get',
 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' ];
 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                 $this->parserOptions->setEditSection( false );
 450                 $this->parserOptions->setWrapOutputClass( false );
 451                 // Don't try to access DB before user language is initialised
 452                 $this->setParserLanguage( Language::factory( 'en' ) );
 453         }
 454
 455         /**
 456          * Get a list of known DB types.
 457          *
 458          * @return array
 459          */
 460         public static function getDBTypes() {
 461                 return self::$dbTypes;
 462         }
 463
 464         /**
 465          * Do initial checks of the PHP environment. Set variables according to
 466          * the observed environment.
 467          *
 468          * It's possible that this may be called under the CLI SAPI, not the SAPI
 469          * that the wiki will primarily run under. In that case, the subclass should
 470          * initialise variables such as wgScriptPath, before calling this function.
 471          *
 472          * Under the web subclass, it can already be assumed that PHP 5+ is in use
 473          * and that sessions are working.
 474          *
 475          * @return Status
 476          */
 477         public function doEnvironmentChecks() {
 478                 // Php version has already been checked by entry scripts
 479                 // Show message here for information purposes
 480                 if ( wfIsHHVM() ) {
 481                         $this->showMessage( 'config-env-hhvm', HHVM_VERSION );
 482                 } else {
 483                         $this->showMessage( 'config-env-php', PHP_VERSION );
 484                 }
 485
 486                 $good = true;
 487                 // Must go here because an old version of PCRE can prevent other checks from completing
 488                 list( $pcreVersion ) = explode( ' ', PCRE_VERSION, 2 );
 489                 if ( version_compare( $pcreVersion, self::MINIMUM_PCRE_VERSION, '<' ) ) {
 490                         $this->showError( 'config-pcre-old', self::MINIMUM_PCRE_VERSION, $pcreVersion );
 491                         $good = false;
 492                 } else {
 493                         foreach ( $this->envChecks as $check ) {
 494                                 $status = $this->$check();
 495                                 if ( $status === false ) {
 496                                         $good = false;
 497                                 }
 498                         }
 499                 }
 500
 501                 $this->setVar( '_Environment', $good );
 502
 503                 return $good ? Status::newGood() : Status::newFatal( 'config-env-bad' );
 504         }
 505
 506         public function doEnvironmentPreps() {
 507                 foreach ( $this->envPreps as $prep ) {
 508                         $this->$prep();
 509                 }
 510         }
 511
 512         /**
 513          * Set a MW configuration variable, or internal installer configuration variable.
 514          *
 515          * @param string $name
 516          * @param mixed $value
 517          */
 518         public function setVar( $name, $value ) {
 519                 $this->settings[$name] = $value;
 520         }
 521
 522         /**
 523          * Get an MW configuration variable, or internal installer configuration variable.
 524          * The defaults come from $GLOBALS (ultimately DefaultSettings.php).
 525          * Installer variables are typically prefixed by an underscore.
 526          *
 527          * @param string $name
 528          * @param mixed $default
 529          *
 530          * @return mixed
 531          */
 532         public function getVar( $name, $default = null ) {
 533                 if ( !isset( $this->settings[$name] ) ) {
 534                         return $default;
 535                 } else {
 536                         return $this->settings[$name];
 537                 }
 538         }
 539
 540         /**
 541          * Get a list of DBs supported by current PHP setup
 542          *
 543          * @return array
 544          */
 545         public function getCompiledDBs() {
 546                 return $this->compiledDBs;
 547         }
 548
 549         /**
 550          * Get the DatabaseInstaller class name for this type
 551          *
 552          * @param string $type database type ($wgDBtype)
 553          * @return string Class name
 554          * @since 1.30
 555          */
 556         public static function getDBInstallerClass( $type ) {
 557                 return ucfirst( $type ) . 'Installer';
 558         }
 559
 560         /**
 561          * Get an instance of DatabaseInstaller for the specified DB type.
 562          *
 563          * @param mixed $type DB installer for which is needed, false to use default.
 564          *
 565          * @return DatabaseInstaller
 566          */
 567         public function getDBInstaller( $type = false ) {
 568                 if ( !$type ) {
 569                         $type = $this->getVar( 'wgDBtype' );
 570                 }
 571
 572                 $type = strtolower( $type );
 573
 574                 if ( !isset( $this->dbInstallers[$type] ) ) {
 575                         $class = self::getDBInstallerClass( $type );
 576                         $this->dbInstallers[$type] = new $class( $this );
 577                 }
 578
 579                 return $this->dbInstallers[$type];
 580         }
 581
 582         /**
 583          * Determine if LocalSettings.php exists. If it does, return its variables.
 584          *
 585          * @return array|false
 586          */
 587         public static function getExistingLocalSettings() {
 588                 global $IP;
 589
 590                 // You might be wondering why this is here. Well if you don't do this
 591                 // then some poorly-formed extensions try to call their own classes
 592                 // after immediately registering them. We really need to get extension
 593                 // registration out of the global scope and into a real format.
 594                 // @see https://phabricator.wikimedia.org/T69440
 595                 global $wgAutoloadClasses;
 596                 $wgAutoloadClasses = [];
 597
 598                 // @codingStandardsIgnoreStart
 599                 // LocalSettings.php should not call functions, except wfLoadSkin/wfLoadExtensions
 600                 // Define the required globals here, to ensure, the functions can do it work correctly.
 601                 global $wgExtensionDirectory, $wgStyleDirectory;
 602                 // @codingStandardsIgnoreEnd
 603
 604                 MediaWiki\suppressWarnings();
 605                 $_lsExists = file_exists( "$IP/LocalSettings.php" );
 606                 MediaWiki\restoreWarnings();
 607
 608                 if ( !$_lsExists ) {
 609                         return false;
 610                 }
 611                 unset( $_lsExists );
 612
 613                 require "$IP/includes/DefaultSettings.php";
 614                 require "$IP/LocalSettings.php";
 615
 616                 return get_defined_vars();
 617         }
 618
 619         /**
 620          * Get a fake password for sending back to the user in HTML.
 621          * This is a security mechanism to avoid compromise of the password in the
 622          * event of session ID compromise.
 623          *
 624          * @param string $realPassword
 625          *
 626          * @return string
 627          */
 628         public function getFakePassword( $realPassword ) {
 629                 return str_repeat( '*', strlen( $realPassword ) );
 630         }
 631
 632         /**
 633          * Set a variable which stores a password, except if the new value is a
 634          * fake password in which case leave it as it is.
 635          *
 636          * @param string $name
 637          * @param mixed $value
 638          */
 639         public function setPassword( $name, $value ) {
 640                 if ( !preg_match( '/^\*+$/', $value ) ) {
 641                         $this->setVar( $name, $value );
 642                 }
 643         }
 644
 645         /**
 646          * On POSIX systems return the primary group of the webserver we're running under.
 647          * On other systems just returns null.
 648          *
 649          * This is used to advice the user that he should chgrp his mw-config/data/images directory as the
 650          * webserver user before he can install.
 651          *
 652          * Public because SqliteInstaller needs it, and doesn't subclass Installer.
 653          *
 654          * @return mixed
 655          */
 656         public static function maybeGetWebserverPrimaryGroup() {
 657                 if ( !function_exists( 'posix_getegid' ) || !function_exists( 'posix_getpwuid' ) ) {
 658                         # I don't know this, this isn't UNIX.
 659                         return null;
 660                 }
 661
 662                 # posix_getegid() *not* getmygid() because we want the group of the webserver,
 663                 # not whoever owns the current script.
 664                 $gid = posix_getegid();
 665                 $group = posix_getpwuid( $gid )['name'];
 666
 667                 return $group;
 668         }
 669
 670         /**
 671          * Convert wikitext $text to HTML.
 672          *
 673          * This is potentially error prone since many parser features require a complete
 674          * installed MW database. The solution is to just not use those features when you
 675          * write your messages. This appears to work well enough. Basic formatting and
 676          * external links work just fine.
 677          *
 678          * But in case a translator decides to throw in a "#ifexist" or internal link or
 679          * whatever, this function is guarded to catch the attempted DB access and to present
 680          * some fallback text.
 681          *
 682          * @param string $text
 683          * @param bool $lineStart
 684          * @return string
 685          */
 686         public function parse( $text, $lineStart = false ) {
 687                 global $wgParser;
 688
 689                 try {
 690                         $out = $wgParser->parse( $text, $this->parserTitle, $this->parserOptions, $lineStart );
 691                         $html = $out->getText( [
 692                                 'enableSectionEditLinks' => false,
 693                         ] );
 694                 } catch ( MediaWiki\Services\ServiceDisabledException $e ) {
 695                         $html = '<!--DB access attempted during parse-->  ' . htmlspecialchars( $text );
 696                 }
 697
 698                 return $html;
 699         }
 700
 701         /**
 702          * @return ParserOptions
 703          */
 704         public function getParserOptions() {
 705                 return $this->parserOptions;
 706         }
 707
 708         public function disableLinkPopups() {
 709                 $this->parserOptions->setExternalLinkTarget( false );
 710         }
 711
 712         public function restoreLinkPopups() {
 713                 global $wgExternalLinkTarget;
 714                 $this->parserOptions->setExternalLinkTarget( $wgExternalLinkTarget );
 715         }
 716
 717         /**
 718          * Install step which adds a row to the site_stats table with appropriate
 719          * initial values.
 720          *
 721          * @param DatabaseInstaller $installer
 722          *
 723          * @return Status
 724          */
 725         public function populateSiteStats( DatabaseInstaller $installer ) {
 726                 $status = $installer->getConnection();
 727                 if ( !$status->isOK() ) {
 728                         return $status;
 729                 }
 730                 $status->value->insert(
 731                         'site_stats',
 732                         [
 733                                 'ss_row_id' => 1,
 734                                 'ss_total_edits' => 0,
 735                                 'ss_good_articles' => 0,
 736                                 'ss_total_pages' => 0,
 737                                 'ss_users' => 0,
 738                                 'ss_active_users' => 0,
 739                                 'ss_images' => 0
 740                         ],
 741                         __METHOD__, 'IGNORE'
 742                 );
 743
 744                 return Status::newGood();
 745         }
 746
 747         /**
 748          * Environment check for DB types.
 749          * @return bool
 750          */
 751         protected function envCheckDB() {
 752                 global $wgLang;
 753
 754                 $allNames = [];
 755
 756                 // Messages: config-type-mysql, config-type-postgres, config-type-oracle,
 757                 // config-type-sqlite
 758                 foreach ( self::getDBTypes() as $name ) {
 759                         $allNames[] = wfMessage( "config-type-$name" )->text();
 760                 }
 761
 762                 $databases = $this->getCompiledDBs();
 763
 764                 $databases = array_flip( $databases );
 765                 foreach ( array_keys( $databases ) as $db ) {
 766                         $installer = $this->getDBInstaller( $db );
 767                         $status = $installer->checkPrerequisites();
 768                         if ( !$status->isGood() ) {
 769                                 $this->showStatusMessage( $status );
 770                         }
 771                         if ( !$status->isOK() ) {
 772                                 unset( $databases[$db] );
 773                         }
 774                 }
 775                 $databases = array_flip( $databases );
 776                 if ( !$databases ) {
 777                         $this->showError( 'config-no-db', $wgLang->commaList( $allNames ), count( $allNames ) );
 778
 779                         // @todo FIXME: This only works for the web installer!
 780                         return false;
 781                 }
 782
 783                 return true;
 784         }
 785
 786         /**
 787          * Some versions of libxml+PHP break < and > encoding horribly
 788          * @return bool
 789          */
 790         protected function envCheckBrokenXML() {
 791                 $test = new PhpXmlBugTester();
 792                 if ( !$test->ok ) {
 793                         $this->showError( 'config-brokenlibxml' );
 794
 795                         return false;
 796                 }
 797
 798                 return true;
 799         }
 800
 801         /**
 802          * Environment check for the PCRE module.
 803          *
 804          * @note If this check were to fail, the parser would
 805          *   probably throw an exception before the result
 806          *   of this check is shown to the user.
 807          * @return bool
 808          */
 809         protected function envCheckPCRE() {
 810                 MediaWiki\suppressWarnings();
 811                 $regexd = preg_replace( '/[\x{0430}-\x{04FF}]/iu', '', '-АБВГД-' );
 812                 // Need to check for \p support too, as PCRE can be compiled
 813                 // with utf8 support, but not unicode property support.
 814                 // check that \p{Zs} (space separators) matches
 815                 // U+3000 (Ideographic space)
 816                 $regexprop = preg_replace( '/\p{Zs}/u', '', "-\xE3\x80\x80-" );
 817                 MediaWiki\restoreWarnings();
 818                 if ( $regexd != '--' || $regexprop != '--' ) {
 819                         $this->showError( 'config-pcre-no-utf8' );
 820
 821                         return false;
 822                 }
 823
 824                 return true;
 825         }
 826
 827         /**
 828          * Environment check for available memory.
 829          * @return bool
 830          */
 831         protected function envCheckMemory() {
 832                 $limit = ini_get( 'memory_limit' );
 833
 834                 if ( !$limit || $limit == -1 ) {
 835                         return true;
 836                 }
 837
 838                 $n = wfShorthandToInteger( $limit );
 839
 840                 if ( $n < $this->minMemorySize * 1024 * 1024 ) {
 841                         $newLimit = "{$this->minMemorySize}M";
 842
 843                         if ( ini_set( "memory_limit", $newLimit ) === false ) {
 844                                 $this->showMessage( 'config-memory-bad', $limit );
 845                         } else {
 846                                 $this->showMessage( 'config-memory-raised', $limit, $newLimit );
 847                                 $this->setVar( '_RaiseMemory', true );
 848                         }
 849                 }
 850
 851                 return true;
 852         }
 853
 854         /**
 855          * Environment check for compiled object cache types.
 856          */
 857         protected function envCheckCache() {
 858                 $caches = [];
 859                 foreach ( $this->objectCaches as $name => $function ) {
 860                         if ( function_exists( $function ) ) {
 861                                 if ( $name == 'xcache' && !wfIniGetBool( 'xcache.var_size' ) ) {
 862                                         continue;
 863                                 }
 864                                 $caches[$name] = true;
 865                         }
 866                 }
 867
 868                 if ( !$caches ) {
 869                         $key = 'config-no-cache-apcu';
 870                         $this->showMessage( $key );
 871                 }
 872
 873                 $this->setVar( '_Caches', $caches );
 874         }
 875
 876         /**
 877          * Scare user to death if they have mod_security or mod_security2
 878          * @return bool
 879          */
 880         protected function envCheckModSecurity() {
 881                 if ( self::apacheModulePresent( 'mod_security' )
 882                         || self::apacheModulePresent( 'mod_security2' ) ) {
 883                         $this->showMessage( 'config-mod-security' );
 884                 }
 885
 886                 return true;
 887         }
 888
 889         /**
 890          * Search for GNU diff3.
 891          * @return bool
 892          */
 893         protected function envCheckDiff3() {
 894                 $names = [ "gdiff3", "diff3" ];
 895                 if ( wfIsWindows() ) {
 896                         $names[] = 'diff3.exe';
 897                 }
 898                 $versionInfo = [ '--version', 'GNU diffutils' ];
 899
 900                 $diff3 = ExecutableFinder::findInDefaultPaths( $names, $versionInfo );
 901
 902                 if ( $diff3 ) {
 903                         $this->setVar( 'wgDiff3', $diff3 );
 904                 } else {
 905                         $this->setVar( 'wgDiff3', false );
 906                         $this->showMessage( 'config-diff3-bad' );
 907                 }
 908
 909                 return true;
 910         }
 911
 912         /**
 913          * Environment check for ImageMagick and GD.
 914          * @return bool
 915          */
 916         protected function envCheckGraphics() {
 917                 $names = wfIsWindows() ? 'convert.exe' : 'convert';
 918                 $versionInfo = [ '-version', 'ImageMagick' ];
 919                 $convert = ExecutableFinder::findInDefaultPaths( $names, $versionInfo );
 920
 921                 $this->setVar( 'wgImageMagickConvertCommand', '' );
 922                 if ( $convert ) {
 923                         $this->setVar( 'wgImageMagickConvertCommand', $convert );
 924                         $this->showMessage( 'config-imagemagick', $convert );
 925
 926                         return true;
 927                 } elseif ( function_exists( 'imagejpeg' ) ) {
 928                         $this->showMessage( 'config-gd' );
 929                 } else {
 930                         $this->showMessage( 'config-no-scaling' );
 931                 }
 932
 933                 return true;
 934         }
 935
 936         /**
 937          * Search for git.
 938          *
 939          * @since 1.22
 940          * @return bool
 941          */
 942         protected function envCheckGit() {
 943                 $names = wfIsWindows() ? 'git.exe' : 'git';
 944                 $versionInfo = [ '--version', 'git version' ];
 945
 946                 $git = ExecutableFinder::findInDefaultPaths( $names, $versionInfo );
 947
 948                 if ( $git ) {
 949                         $this->setVar( 'wgGitBin', $git );
 950                         $this->showMessage( 'config-git', $git );
 951                 } else {
 952                         $this->setVar( 'wgGitBin', false );
 953                         $this->showMessage( 'config-git-bad' );
 954                 }
 955
 956                 return true;
 957         }
 958
 959         /**
 960          * Environment check to inform user which server we've assumed.
 961          *
 962          * @return bool
 963          */
 964         protected function envCheckServer() {
 965                 $server = $this->envGetDefaultServer();
 966                 if ( $server !== null ) {
 967                         $this->showMessage( 'config-using-server', $server );
 968                 }
 969                 return true;
 970         }
 971
 972         /**
 973          * Environment check to inform user which paths we've assumed.
 974          *
 975          * @return bool
 976          */
 977         protected function envCheckPath() {
 978                 $this->showMessage(
 979                         'config-using-uri',
 980                         $this->getVar( 'wgServer' ),
 981                         $this->getVar( 'wgScriptPath' )
 982                 );
 983                 return true;
 984         }
 985
 986         /**
 987          * Environment check for preferred locale in shell
 988          * @return bool
 989          */
 990         protected function envCheckShellLocale() {
 991                 $os = php_uname( 's' );
 992                 $supported = [ 'Linux', 'SunOS', 'HP-UX', 'Darwin' ]; # Tested these
 993
 994                 if ( !in_array( $os, $supported ) ) {
 995                         return true;
 996                 }
 997
 998                 # Get a list of available locales.
 999                 $ret = false;
1000                 $lines = wfShellExec( '/usr/bin/locale -a', $ret );
1001
1002                 if ( $ret ) {
1003                         return true;
1004                 }
1005
1006                 $lines = array_map( 'trim', explode( "\n", $lines ) );
1007                 $candidatesByLocale = [];
1008                 $candidatesByLang = [];
1009
1010                 foreach ( $lines as $line ) {
1011                         if ( $line === '' ) {
1012                                 continue;
1013                         }
1014
1015                         if ( !preg_match( '/^([a-zA-Z]+)(_[a-zA-Z]+|)\.(utf8|UTF-8)(@[a-zA-Z_]*|)$/i', $line, $m ) ) {
1016                                 continue;
1017                         }
1018
1019                         list( , $lang, , , ) = $m;
1020
1021                         $candidatesByLocale[$m[0]] = $m;
1022                         $candidatesByLang[$lang][] = $m;
1023                 }
1024
1025                 # Try the current value of LANG.
1026                 if ( isset( $candidatesByLocale[getenv( 'LANG' )] ) ) {
1027                         $this->setVar( 'wgShellLocale', getenv( 'LANG' ) );
1028
1029                         return true;
1030                 }
1031
1032                 # Try the most common ones.
1033                 $commonLocales = [ 'C.UTF-8', 'en_US.UTF-8', 'en_US.utf8', 'de_DE.UTF-8', 'de_DE.utf8' ];
1034                 foreach ( $commonLocales as $commonLocale ) {
1035                         if ( isset( $candidatesByLocale[$commonLocale] ) ) {
1036                                 $this->setVar( 'wgShellLocale', $commonLocale );
1037
1038                                 return true;
1039                         }
1040                 }
1041
1042                 # Is there an available locale in the Wiki's language?
1043                 $wikiLang = $this->getVar( 'wgLanguageCode' );
1044
1045                 if ( isset( $candidatesByLang[$wikiLang] ) ) {
1046                         $m = reset( $candidatesByLang[$wikiLang] );
1047                         $this->setVar( 'wgShellLocale', $m[0] );
1048
1049                         return true;
1050                 }
1051
1052                 # Are there any at all?
1053                 if ( count( $candidatesByLocale ) ) {
1054                         $m = reset( $candidatesByLocale );
1055                         $this->setVar( 'wgShellLocale', $m[0] );
1056
1057                         return true;
1058                 }
1059
1060                 # Give up.
1061                 return true;
1062         }
1063
1064         /**
1065          * Environment check for the permissions of the uploads directory
1066          * @return bool
1067          */
1068         protected function envCheckUploadsDirectory() {
1069                 global $IP;
1070
1071                 $dir = $IP . '/images/';
1072                 $url = $this->getVar( 'wgServer' ) . $this->getVar( 'wgScriptPath' ) . '/images/';
1073                 $safe = !$this->dirIsExecutable( $dir, $url );
1074
1075                 if ( !$safe ) {
1076                         $this->showMessage( 'config-uploads-not-safe', $dir );
1077                 }
1078
1079                 return true;
1080         }
1081
1082         /**
1083          * Checks if suhosin.get.max_value_length is set, and if so generate
1084          * a warning because it decreases ResourceLoader performance.
1085          * @return bool
1086          */
1087         protected function envCheckSuhosinMaxValueLength() {
1088                 $maxValueLength = ini_get( 'suhosin.get.max_value_length' );
1089                 if ( $maxValueLength > 0 && $maxValueLength < 1024 ) {
1090                         // Only warn if the value is below the sane 1024
1091                         $this->showMessage( 'config-suhosin-max-value-length', $maxValueLength );
1092                 }
1093
1094                 return true;
1095         }
1096
1097         /**
1098          * Checks if we're running on 64 bit or not. 32 bit is becoming increasingly
1099          * hard to support, so let's at least warn people.
1100          *
1101          * @return bool
1102          */
1103         protected function envCheck64Bit() {
1104                 if ( PHP_INT_SIZE == 4 ) {
1105                         $this->showMessage( 'config-using-32bit' );
1106                 }
1107
1108                 return true;
1109         }
1110
1111         /**
1112          * Convert a hex string representing a Unicode code point to that code point.
1113          * @param string $c
1114          * @return string|false
1115          */
1116         protected function unicodeChar( $c ) {
1117                 $c = hexdec( $c );
1118                 if ( $c <= 0x7F ) {
1119                         return chr( $c );
1120                 } elseif ( $c <= 0x7FF ) {
1121                         return chr( 0xC0 | $c >> 6 ) . chr( 0x80 | $c & 0x3F );
1122                 } elseif ( $c <= 0xFFFF ) {
1123                         return chr( 0xE0 | $c >> 12 ) . chr( 0x80 | $c >> 6 & 0x3F ) .
1124                                 chr( 0x80 | $c & 0x3F );
1125                 } elseif ( $c <= 0x10FFFF ) {
1126                         return chr( 0xF0 | $c >> 18 ) . chr( 0x80 | $c >> 12 & 0x3F ) .
1127                                 chr( 0x80 | $c >> 6 & 0x3F ) .
1128                                 chr( 0x80 | $c & 0x3F );
1129                 } else {
1130                         return false;
1131                 }
1132         }
1133
1134         /**
1135          * Check the libicu version
1136          */
1137         protected function envCheckLibicu() {
1138                 /**
1139                  * This needs to be updated something that the latest libicu
1140                  * will properly normalize.  This normalization was found at
1141                  * http://www.unicode.org/versions/Unicode5.2.0/#Character_Additions
1142                  * Note that we use the hex representation to create the code
1143                  * points in order to avoid any Unicode-destroying during transit.
1144                  */
1145                 $not_normal_c = $this->unicodeChar( "FA6C" );
1146                 $normal_c = $this->unicodeChar( "242EE" );
1147
1148                 $useNormalizer = 'php';
1149                 $needsUpdate = false;
1150
1151                 if ( function_exists( 'normalizer_normalize' ) ) {
1152                         $useNormalizer = 'intl';
1153                         $intl = normalizer_normalize( $not_normal_c, Normalizer::FORM_C );
1154                         if ( $intl !== $normal_c ) {
1155                                 $needsUpdate = true;
1156                         }
1157                 }
1158
1159                 // Uses messages 'config-unicode-using-php' and 'config-unicode-using-intl'
1160                 if ( $useNormalizer === 'php' ) {
1161                         $this->showMessage( 'config-unicode-pure-php-warning' );
1162                 } else {
1163                         $this->showMessage( 'config-unicode-using-' . $useNormalizer );
1164                         if ( $needsUpdate ) {
1165                                 $this->showMessage( 'config-unicode-update-warning' );
1166                         }
1167                 }
1168         }
1169
1170         /**
1171          * Environment prep for the server hostname.
1172          */
1173         protected function envPrepServer() {
1174                 $server = $this->envGetDefaultServer();
1175                 if ( $server !== null ) {
1176                         $this->setVar( 'wgServer', $server );
1177                 }
1178         }
1179
1180         /**
1181          * Helper function to be called from envPrepServer()
1182          * @return string
1183          */
1184         abstract protected function envGetDefaultServer();
1185
1186         /**
1187          * Environment prep for setting $IP and $wgScriptPath.
1188          */
1189         protected function envPrepPath() {
1190                 global $IP;
1191                 $IP = dirname( dirname( __DIR__ ) );
1192                 $this->setVar( 'IP', $IP );
1193         }
1194
1195         /**
1196          * Checks if scripts located in the given directory can be executed via the given URL.
1197          *
1198          * Used only by environment checks.
1199          * @param string $dir
1200          * @param string $url
1201          * @return bool|int|string
1202          */
1203         public function dirIsExecutable( $dir, $url ) {
1204                 $scriptTypes = [
1205                         'php' => [
1206                                 "<?php echo 'ex' . 'ec';",
1207                                 "#!/var/env php5\n<?php echo 'ex' . 'ec';",
1208                         ],
1209                 ];
1210
1211                 // it would be good to check other popular languages here, but it'll be slow.
1212
1213                 MediaWiki\suppressWarnings();
1214
1215                 foreach ( $scriptTypes as $ext => $contents ) {
1216                         foreach ( $contents as $source ) {
1217                                 $file = 'exectest.' . $ext;
1218
1219                                 if ( !file_put_contents( $dir . $file, $source ) ) {
1220                                         break;
1221                                 }
1222
1223                                 try {
1224                                         $text = Http::get( $url . $file, [ 'timeout' => 3 ], __METHOD__ );
1225                                 } catch ( Exception $e ) {
1226                                         // Http::get throws with allow_url_fopen = false and no curl extension.
1227                                         $text = null;
1228                                 }
1229                                 unlink( $dir . $file );
1230
1231                                 if ( $text == 'exec' ) {
1232                                         MediaWiki\restoreWarnings();
1233
1234                                         return $ext;
1235                                 }
1236                         }
1237                 }
1238
1239                 MediaWiki\restoreWarnings();
1240
1241                 return false;
1242         }
1243
1244         /**
1245          * Checks for presence of an Apache module. Works only if PHP is running as an Apache module, too.
1246          *
1247          * @param string $moduleName Name of module to check.
1248          * @return bool
1249          */
1250         public static function apacheModulePresent( $moduleName ) {
1251                 if ( function_exists( 'apache_get_modules' ) && in_array( $moduleName, apache_get_modules() ) ) {
1252                         return true;
1253                 }
1254                 // try it the hard way
1255                 ob_start();
1256                 phpinfo( INFO_MODULES );
1257                 $info = ob_get_clean();
1258
1259                 return strpos( $info, $moduleName ) !== false;
1260         }
1261
1262         /**
1263          * ParserOptions are constructed before we determined the language, so fix it
1264          *
1265          * @param Language $lang
1266          */
1267         public function setParserLanguage( $lang ) {
1268                 $this->parserOptions->setTargetLanguage( $lang );
1269                 $this->parserOptions->setUserLang( $lang );
1270         }
1271
1272         /**
1273          * Overridden by WebInstaller to provide lastPage parameters.
1274          * @param string $page
1275          * @return string
1276          */
1277         protected function getDocUrl( $page ) {
1278                 return "{$_SERVER['PHP_SELF']}?page=" . urlencode( $page );
1279         }
1280
1281         /**
1282          * Finds extensions that follow the format /$directory/Name/Name.php,
1283          * and returns an array containing the value for 'Name' for each found extension.
1284          *
1285          * Reasonable values for $directory include 'extensions' (the default) and 'skins'.
1286          *
1287          * @param string $directory Directory to search in
1288          * @return array [ $extName => [ 'screenshots' => [ '...' ] ]
1289          */
1290         public function findExtensions( $directory = 'extensions' ) {
1291                 if ( $this->getVar( 'IP' ) === null ) {
1292                         return [];
1293                 }
1294
1295                 $extDir = $this->getVar( 'IP' ) . '/' . $directory;
1296                 if ( !is_readable( $extDir ) || !is_dir( $extDir ) ) {
1297                         return [];
1298                 }
1299
1300                 // extensions -> extension.json, skins -> skin.json
1301                 $jsonFile = substr( $directory, 0, strlen( $directory ) - 1 ) . '.json';
1302
1303                 $dh = opendir( $extDir );
1304                 $exts = [];
1305                 while ( ( $file = readdir( $dh ) ) !== false ) {
1306                         if ( !is_dir( "$extDir/$file" ) ) {
1307                                 continue;
1308                         }
1309                         if ( file_exists( "$extDir/$file/$jsonFile" ) || file_exists( "$extDir/$file/$file.php" ) ) {
1310                                 // Extension exists. Now see if there are screenshots
1311                                 $exts[$file] = [];
1312                                 if ( is_dir( "$extDir/$file/screenshots" ) ) {
1313                                         $paths = glob( "$extDir/$file/screenshots/*.png" );
1314                                         foreach ( $paths as $path ) {
1315                                                 $exts[$file]['screenshots'][] = str_replace( $extDir, "../$directory", $path );
1316                                         }
1317
1318                                 }
1319                         }
1320                 }
1321                 closedir( $dh );
1322                 uksort( $exts, 'strnatcasecmp' );
1323
1324                 return $exts;
1325         }
1326
1327         /**
1328          * Returns a default value to be used for $wgDefaultSkin: normally the one set in DefaultSettings,
1329          * but will fall back to another if the default skin is missing and some other one is present
1330          * instead.
1331          *
1332          * @param string[] $skinNames Names of installed skins.
1333          * @return string
1334          */
1335         public function getDefaultSkin( array $skinNames ) {
1336                 $defaultSkin = $GLOBALS['wgDefaultSkin'];
1337                 if ( !$skinNames || in_array( $defaultSkin, $skinNames ) ) {
1338                         return $defaultSkin;
1339                 } else {
1340                         return $skinNames[0];
1341                 }
1342         }
1343
1344         /**
1345          * Installs the auto-detected extensions.
1346          *
1347          * @return Status
1348          */
1349         protected function includeExtensions() {
1350                 global $IP;
1351                 $exts = $this->getVar( '_Extensions' );
1352                 $IP = $this->getVar( 'IP' );
1353
1354                 /**
1355                  * We need to include DefaultSettings before including extensions to avoid
1356                  * warnings about unset variables. However, the only thing we really
1357                  * want here is $wgHooks['LoadExtensionSchemaUpdates']. This won't work
1358                  * if the extension has hidden hook registration in $wgExtensionFunctions,
1359                  * but we're not opening that can of worms
1360                  * @see https://phabricator.wikimedia.org/T28857
1361                  */
1362                 global $wgAutoloadClasses;
1363                 $wgAutoloadClasses = [];
1364                 $queue = [];
1365
1366                 require "$IP/includes/DefaultSettings.php";
1367
1368                 foreach ( $exts as $e ) {
1369                         if ( file_exists( "$IP/extensions/$e/extension.json" ) ) {
1370                                 $queue["$IP/extensions/$e/extension.json"] = 1;
1371                         } else {
1372                                 require_once "$IP/extensions/$e/$e.php";
1373                         }
1374                 }
1375
1376                 $registry = new ExtensionRegistry();
1377                 $data = $registry->readFromQueue( $queue );
1378                 $wgAutoloadClasses += $data['autoload'];
1379
1380                 $hooksWeWant = isset( $wgHooks['LoadExtensionSchemaUpdates'] ) ?
1381                         /** @suppress PhanUndeclaredVariable $wgHooks is set by DefaultSettings */
1382                         $wgHooks['LoadExtensionSchemaUpdates'] : [];
1383
1384                 if ( isset( $data['globals']['wgHooks']['LoadExtensionSchemaUpdates'] ) ) {
1385                         $hooksWeWant = array_merge_recursive(
1386                                 $hooksWeWant,
1387                                 $data['globals']['wgHooks']['LoadExtensionSchemaUpdates']
1388                         );
1389                 }
1390                 // Unset everyone else's hooks. Lord knows what someone might be doing
1391                 // in ParserFirstCallInit (see T29171)
1392                 $GLOBALS['wgHooks'] = [ 'LoadExtensionSchemaUpdates' => $hooksWeWant ];
1393
1394                 return Status::newGood();
1395         }
1396
1397         /**
1398          * Get an array of install steps. Should always be in the format of
1399          * [
1400          *   'name'     => 'someuniquename',
1401          *   'callback' => [ $obj, 'method' ],
1402          * ]
1403          * There must be a config-install-$name message defined per step, which will
1404          * be shown on install.
1405          *
1406          * @param DatabaseInstaller $installer DatabaseInstaller so we can make callbacks
1407          * @return array
1408          */
1409         protected function getInstallSteps( DatabaseInstaller $installer ) {
1410                 $coreInstallSteps = [
1411                         [ 'name' => 'database', 'callback' => [ $installer, 'setupDatabase' ] ],
1412                         [ 'name' => 'tables', 'callback' => [ $installer, 'createTables' ] ],
1413                         [ 'name' => 'interwiki', 'callback' => [ $installer, 'populateInterwikiTable' ] ],
1414                         [ 'name' => 'stats', 'callback' => [ $this, 'populateSiteStats' ] ],
1415                         [ 'name' => 'keys', 'callback' => [ $this, 'generateKeys' ] ],
1416                         [ 'name' => 'updates', 'callback' => [ $installer, 'insertUpdateKeys' ] ],
1417                         [ 'name' => 'sysop', 'callback' => [ $this, 'createSysop' ] ],
1418                         [ 'name' => 'mainpage', 'callback' => [ $this, 'createMainpage' ] ],
1419                 ];
1420
1421                 // Build the array of install steps starting from the core install list,
1422                 // then adding any callbacks that wanted to attach after a given step
1423                 foreach ( $coreInstallSteps as $step ) {
1424                         $this->installSteps[] = $step;
1425                         if ( isset( $this->extraInstallSteps[$step['name']] ) ) {
1426                                 $this->installSteps = array_merge(
1427                                         $this->installSteps,
1428                                         $this->extraInstallSteps[$step['name']]
1429                                 );
1430                         }
1431                 }
1432
1433                 // Prepend any steps that want to be at the beginning
1434                 if ( isset( $this->extraInstallSteps['BEGINNING'] ) ) {
1435                         $this->installSteps = array_merge(
1436                                 $this->extraInstallSteps['BEGINNING'],
1437                                 $this->installSteps
1438                         );
1439                 }
1440
1441                 // Extensions should always go first, chance to tie into hooks and such
1442                 if ( count( $this->getVar( '_Extensions' ) ) ) {
1443                         array_unshift( $this->installSteps,
1444                                 [ 'name' => 'extensions', 'callback' => [ $this, 'includeExtensions' ] ]
1445                         );
1446                         $this->installSteps[] = [
1447                                 'name' => 'extension-tables',
1448                                 'callback' => [ $installer, 'createExtensionTables' ]
1449                         ];
1450                 }
1451
1452                 return $this->installSteps;
1453         }
1454
1455         /**
1456          * Actually perform the installation.
1457          *
1458          * @param callable $startCB A callback array for the beginning of each step
1459          * @param callable $endCB A callback array for the end of each step
1460          *
1461          * @return array Array of Status objects
1462          */
1463         public function performInstallation( $startCB, $endCB ) {
1464                 $installResults = [];
1465                 $installer = $this->getDBInstaller();
1466                 $installer->preInstall();
1467                 $steps = $this->getInstallSteps( $installer );
1468                 foreach ( $steps as $stepObj ) {
1469                         $name = $stepObj['name'];
1470                         call_user_func_array( $startCB, [ $name ] );
1471
1472                         // Perform the callback step
1473                         $status = call_user_func( $stepObj['callback'], $installer );
1474
1475                         // Output and save the results
1476                         call_user_func( $endCB, $name, $status );
1477                         $installResults[$name] = $status;
1478
1479                         // If we've hit some sort of fatal, we need to bail.
1480                         // Callback already had a chance to do output above.
1481                         if ( !$status->isOk() ) {
1482                                 break;
1483                         }
1484                 }
1485                 if ( $status->isOk() ) {
1486                         $this->showMessage(
1487                                 'config-install-success',
1488                                 $this->getVar( 'wgServer' ),
1489                                 $this->getVar( 'wgScriptPath' )
1490                         );
1491                         $this->setVar( '_InstallDone', true );
1492                 }
1493
1494                 return $installResults;
1495         }
1496
1497         /**
1498          * Generate $wgSecretKey. Will warn if we had to use an insecure random source.
1499          *
1500          * @return Status
1501          */
1502         public function generateKeys() {
1503                 $keys = [ 'wgSecretKey' => 64 ];
1504                 if ( strval( $this->getVar( 'wgUpgradeKey' ) ) === '' ) {
1505                         $keys['wgUpgradeKey'] = 16;
1506                 }
1507
1508                 return $this->doGenerateKeys( $keys );
1509         }
1510
1511         /**
1512          * Generate a secret value for variables using our CryptRand generator.
1513          * Produce a warning if the random source was insecure.
1514          *
1515          * @param array $keys
1516          * @return Status
1517          */
1518         protected function doGenerateKeys( $keys ) {
1519                 $status = Status::newGood();
1520
1521                 $strong = true;
1522                 foreach ( $keys as $name => $length ) {
1523                         $secretKey = MWCryptRand::generateHex( $length, true );
1524                         if ( !MWCryptRand::wasStrong() ) {
1525                                 $strong = false;
1526                         }
1527
1528                         $this->setVar( $name, $secretKey );
1529                 }
1530
1531                 if ( !$strong ) {
1532                         $names = array_keys( $keys );
1533                         $names = preg_replace( '/^(.*)$/', '\$$1', $names );
1534                         global $wgLang;
1535                         $status->warning( 'config-insecure-keys', $wgLang->listToText( $names ), count( $names ) );
1536                 }
1537
1538                 return $status;
1539         }
1540
1541         /**
1542          * Create the first user account, grant it sysop and bureaucrat rights
1543          *
1544          * @return Status
1545          */
1546         protected function createSysop() {
1547                 $name = $this->getVar( '_AdminName' );
1548                 $user = User::newFromName( $name );
1549
1550                 if ( !$user ) {
1551                         // We should've validated this earlier anyway!
1552                         return Status::newFatal( 'config-admin-error-user', $name );
1553                 }
1554
1555                 if ( $user->idForName() == 0 ) {
1556                         $user->addToDatabase();
1557
1558                         try {
1559                                 $user->setPassword( $this->getVar( '_AdminPassword' ) );
1560                         } catch ( PasswordError $pwe ) {
1561                                 return Status::newFatal( 'config-admin-error-password', $name, $pwe->getMessage() );
1562                         }
1563
1564                         $user->addGroup( 'sysop' );
1565                         $user->addGroup( 'bureaucrat' );
1566                         if ( $this->getVar( '_AdminEmail' ) ) {
1567                                 $user->setEmail( $this->getVar( '_AdminEmail' ) );
1568                         }
1569                         $user->saveSettings();
1570
1571                         // Update user count
1572                         $ssUpdate = new SiteStatsUpdate( 0, 0, 0, 0, 1 );
1573                         $ssUpdate->doUpdate();
1574                 }
1575                 $status = Status::newGood();
1576
1577                 if ( $this->getVar( '_Subscribe' ) && $this->getVar( '_AdminEmail' ) ) {
1578                         $this->subscribeToMediaWikiAnnounce( $status );
1579                 }
1580
1581                 return $status;
1582         }
1583
1584         /**
1585          * @param Status $s
1586          */
1587         private function subscribeToMediaWikiAnnounce( Status $s ) {
1588                 $params = [
1589                         'email' => $this->getVar( '_AdminEmail' ),
1590                         'language' => 'en',
1591                         'digest' => 0
1592                 ];
1593
1594                 // Mailman doesn't support as many languages as we do, so check to make
1595                 // sure their selected language is available
1596                 $myLang = $this->getVar( '_UserLang' );
1597                 if ( in_array( $myLang, $this->mediaWikiAnnounceLanguages ) ) {
1598                         $myLang = $myLang == 'pt-br' ? 'pt_BR' : $myLang; // rewrite to Mailman's pt_BR
1599                         $params['language'] = $myLang;
1600                 }
1601
1602                 if ( MWHttpRequest::canMakeRequests() ) {
1603                         $res = MWHttpRequest::factory( $this->mediaWikiAnnounceUrl,
1604                                 [ 'method' => 'POST', 'postData' => $params ], __METHOD__ )->execute();
1605                         if ( !$res->isOK() ) {
1606                                 $s->warning( 'config-install-subscribe-fail', $res->getMessage() );
1607                         }
1608                 } else {
1609                         $s->warning( 'config-install-subscribe-notpossible' );
1610                 }
1611         }
1612
1613         /**
1614          * Insert Main Page with default content.
1615          *
1616          * @param DatabaseInstaller $installer
1617          * @return Status
1618          */
1619         protected function createMainpage( DatabaseInstaller $installer ) {
1620                 $status = Status::newGood();
1621                 $title = Title::newMainPage();
1622                 if ( $title->exists() ) {
1623                         $status->warning( 'config-install-mainpage-exists' );
1624                         return $status;
1625                 }
1626                 try {
1627                         $page = WikiPage::factory( $title );
1628                         $content = new WikitextContent(
1629                                 wfMessage( 'mainpagetext' )->inContentLanguage()->text() . "\n\n" .
1630                                 wfMessage( 'mainpagedocfooter' )->inContentLanguage()->text()
1631                         );
1632
1633                         $status = $page->doEditContent( $content,
1634                                 '',
1635                                 EDIT_NEW,
1636                                 false,
1637                                 User::newFromName( 'MediaWiki default' )
1638                         );
1639                 } catch ( Exception $e ) {
1640                         // using raw, because $wgShowExceptionDetails can not be set yet
1641                         $status->fatal( 'config-install-mainpage-failed', $e->getMessage() );
1642                 }
1643
1644                 return $status;
1645         }
1646
1647         /**
1648          * Override the necessary bits of the config to run an installation.
1649          */
1650         public static function overrideConfig() {
1651                 // Use PHP's built-in session handling, since MediaWiki's
1652                 // SessionHandler can't work before we have an object cache set up.
1653                 define( 'MW_NO_SESSION_HANDLER', 1 );
1654
1655                 // Don't access the database
1656                 $GLOBALS['wgUseDatabaseMessages'] = false;
1657                 // Don't cache langconv tables
1658                 $GLOBALS['wgLanguageConverterCacheType'] = CACHE_NONE;
1659                 // Debug-friendly
1660                 $GLOBALS['wgShowExceptionDetails'] = true;
1661                 // Don't break forms
1662                 $GLOBALS['wgExternalLinkTarget'] = '_blank';
1663
1664                 // Extended debugging
1665                 $GLOBALS['wgShowSQLErrors'] = true;
1666                 $GLOBALS['wgShowDBErrorBacktrace'] = true;
1667
1668                 // Allow multiple ob_flush() calls
1669                 $GLOBALS['wgDisableOutputCompression'] = true;
1670
1671                 // Use a sensible cookie prefix (not my_wiki)
1672                 $GLOBALS['wgCookiePrefix'] = 'mw_installer';
1673
1674                 // Some of the environment checks make shell requests, remove limits
1675                 $GLOBALS['wgMaxShellMemory'] = 0;
1676
1677                 // Override the default CookieSessionProvider with a dummy
1678                 // implementation that won't stomp on PHP's cookies.
1679                 $GLOBALS['wgSessionProviders'] = [
1680                         [
1681                                 'class' => 'InstallerSessionProvider',
1682                                 'args' => [ [
1683                                         'priority' => 1,
1684                                 ] ]
1685                         ]
1686                 ];
1687
1688                 // Don't try to use any object cache for SessionManager either.
1689                 $GLOBALS['wgSessionCacheType'] = CACHE_NONE;
1690         }
1691
1692         /**
1693          * Add an installation step following the given step.
1694          *
1695          * @param callable $callback A valid installation callback array, in this form:
1696          *    [ 'name' => 'some-unique-name', 'callback' => [ $obj, 'function' ] ];
1697          * @param string $findStep The step to find. Omit to put the step at the beginning
1698          */
1699         public function addInstallStep( $callback, $findStep = 'BEGINNING' ) {
1700                 $this->extraInstallSteps[$findStep][] = $callback;
1701         }
1702
1703         /**
1704          * Disable the time limit for execution.
1705          * Some long-running pages (Install, Upgrade) will want to do this
1706          */
1707         protected function disableTimeLimit() {
1708                 MediaWiki\suppressWarnings();
1709                 set_time_limit( 0 );
1710                 MediaWiki\restoreWarnings();
1711         }
1712 }