includes/installer/Installer.php

   1 <?php
   2 /**
   3  * Base code for MediaWiki installer.
   4  *
   5  * DO NOT PATCH THIS FILE IF YOU NEED TO CHANGE INSTALLER BEHAVIOR IN YOUR PACKAGE!
   6  * See mw-config/overrides/README for details.
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License along
  19  * with this program; if not, write to the Free Software Foundation, Inc.,
  20  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  21  * http://www.gnu.org/copyleft/gpl.html
  22  *
  23  * @file
  24  * @ingroup Deployment
  25  */
  26
  27 use MediaWiki\Interwiki\NullInterwikiLookup;
  28 use MediaWiki\MediaWikiServices;
  29 use MediaWiki\Shell\Shell;
  30
  31 /**
  32  * This documentation group collects source code files with deployment functionality.
  33  *
  34  * @defgroup Deployment Deployment
  35  */
  36
  37 /**
  38  * Base installer class.
  39  *
  40  * This class provides the base for installation and update functionality
  41  * for both MediaWiki core and extensions.
  42  *
  43  * @ingroup Deployment
  44  * @since 1.17
  45  */
  46 abstract class Installer {
  47
  48         /**
  49          * The oldest version of PCRE we can support.
  50          *
  51          * Defining this is necessary because PHP may be linked with a system version
  52          * of PCRE, which may be older than that bundled with the minimum PHP version.
  53          */
  54         const MINIMUM_PCRE_VERSION = '7.2';
  55
  56         /**
  57          * @var array
  58          */
  59         protected $settings;
  60
  61         /**
  62          * List of detected DBs, access using getCompiledDBs().
  63          *
  64          * @var array
  65          */
  66         protected $compiledDBs;
  67
  68         /**
  69          * Cached DB installer instances, access using getDBInstaller().
  70          *
  71          * @var array
  72          */
  73         protected $dbInstallers = [];
  74
  75         /**
  76          * Minimum memory size in MB.
  77          *
  78          * @var int
  79          */
  80         protected $minMemorySize = 50;
  81
  82         /**
  83          * Cached Title, used by parse().
  84          *
  85          * @var Title
  86          */
  87         protected $parserTitle;
  88
  89         /**
  90          * Cached ParserOptions, used by parse().
  91          *
  92          * @var ParserOptions
  93          */
  94         protected $parserOptions;
  95
  96         /**
  97          * Known database types. These correspond to the class names <type>Installer,
  98          * and are also MediaWiki database types valid for $wgDBtype.
  99          *
 100          * To add a new type, create a <type>Installer class and a Database<type>
 101          * class, and add a config-type-<type> message to MessagesEn.php.
 102          *
 103          * @var array
 104          */
 105         protected static $dbTypes = [
 106                 'mysql',
 107                 'postgres',
 108                 'oracle',
 109                 'mssql',
 110                 'sqlite',
 111         ];
 112
 113         /**
 114          * A list of environment check methods called by doEnvironmentChecks().
 115          * These may output warnings using showMessage(), and/or abort the
 116          * installation process by returning false.
 117          *
 118          * For the WebInstaller these are only called on the Welcome page,
 119          * if these methods have side-effects that should affect later page loads
 120          * (as well as the generated stylesheet), use envPreps instead.
 121          *
 122          * @var array
 123          */
 124         protected $envChecks = [
 125                 'envCheckDB',
 126                 'envCheckBrokenXML',
 127                 'envCheckPCRE',
 128                 'envCheckMemory',
 129                 'envCheckCache',
 130                 'envCheckModSecurity',
 131                 'envCheckDiff3',
 132                 'envCheckGraphics',
 133                 'envCheckGit',
 134                 'envCheckServer',
 135                 'envCheckPath',
 136                 'envCheckShellLocale',
 137                 'envCheckUploadsDirectory',
 138                 'envCheckLibicu',
 139                 'envCheckSuhosinMaxValueLength',
 140                 'envCheck64Bit',
 141         ];
 142
 143         /**
 144          * A list of environment preparation methods called by doEnvironmentPreps().
 145          *
 146          * @var array
 147          */
 148         protected $envPreps = [
 149                 'envPrepServer',
 150                 'envPrepPath',
 151         ];
 152
 153         /**
 154          * MediaWiki configuration globals that will eventually be passed through
 155          * to LocalSettings.php. The names only are given here, the defaults
 156          * typically come from DefaultSettings.php.
 157          *
 158          * @var array
 159          */
 160         protected $defaultVarNames = [
 161                 'wgSitename',
 162                 'wgPasswordSender',
 163                 'wgLanguageCode',
 164                 'wgRightsIcon',
 165                 'wgRightsText',
 166                 'wgRightsUrl',
 167                 'wgEnableEmail',
 168                 'wgEnableUserEmail',
 169                 'wgEnotifUserTalk',
 170                 'wgEnotifWatchlist',
 171                 'wgEmailAuthentication',
 172                 'wgDBname',
 173                 'wgDBtype',
 174                 'wgDiff3',
 175                 'wgImageMagickConvertCommand',
 176                 'wgGitBin',
 177                 'IP',
 178                 'wgScriptPath',
 179                 'wgMetaNamespace',
 180                 'wgDeletedDirectory',
 181                 'wgEnableUploads',
 182                 'wgShellLocale',
 183                 'wgSecretKey',
 184                 'wgUseInstantCommons',
 185                 'wgUpgradeKey',
 186                 'wgDefaultSkin',
 187                 'wgPingback',
 188         ];
 189
 190         /**
 191          * Variables that are stored alongside globals, and are used for any
 192          * configuration of the installation process aside from the MediaWiki
 193          * configuration. Map of names to defaults.
 194          *
 195          * @var array
 196          */
 197         protected $internalDefaults = [
 198                 '_UserLang' => 'en',
 199                 '_Environment' => false,
 200                 '_RaiseMemory' => false,
 201                 '_UpgradeDone' => false,
 202                 '_InstallDone' => false,
 203                 '_Caches' => [],
 204                 '_InstallPassword' => '',
 205                 '_SameAccount' => true,
 206                 '_CreateDBAccount' => false,
 207                 '_NamespaceType' => 'site-name',
 208                 '_AdminName' => '', // will be set later, when the user selects language
 209                 '_AdminPassword' => '',
 210                 '_AdminPasswordConfirm' => '',
 211                 '_AdminEmail' => '',
 212                 '_Subscribe' => false,
 213                 '_SkipOptional' => 'continue',
 214                 '_RightsProfile' => 'wiki',
 215                 '_LicenseCode' => 'none',
 216                 '_CCDone' => false,
 217                 '_Extensions' => [],
 218                 '_Skins' => [],
 219                 '_MemCachedServers' => '',
 220                 '_UpgradeKeySupplied' => false,
 221                 '_ExistingDBSettings' => false,
 222
 223                 // $wgLogo is probably wrong (T50084); set something that will work.
 224                 // Single quotes work fine here, as LocalSettingsGenerator outputs this unescaped.
 225                 'wgLogo' => '$wgResourceBasePath/resources/assets/wiki.png',
 226                 'wgAuthenticationTokenVersion' => 1,
 227         ];
 228
 229         /**
 230          * The actual list of installation steps. This will be initialized by getInstallSteps()
 231          *
 232          * @var array
 233          */
 234         private $installSteps = [];
 235
 236         /**
 237          * Extra steps for installation, for things like DatabaseInstallers to modify
 238          *
 239          * @var array
 240          */
 241         protected $extraInstallSteps = [];
 242
 243         /**
 244          * Known object cache types and the functions used to test for their existence.
 245          *
 246          * @var array
 247          */
 248         protected $objectCaches = [
 249                 'apc' => 'apc_fetch',
 250                 'apcu' => 'apcu_fetch',
 251                 'wincache' => 'wincache_ucache_get'
 252         ];
 253
 254         /**
 255          * User rights profiles.
 256          *
 257          * @var array
 258          */
 259         public $rightsProfiles = [
 260                 'wiki' => [],
 261                 'no-anon' => [
 262                         '*' => [ 'edit' => false ]
 263                 ],
 264                 'fishbowl' => [
 265                         '*' => [
 266                                 'createaccount' => false,
 267                                 'edit' => false,
 268                         ],
 269                 ],
 270                 'private' => [
 271                         '*' => [
 272                                 'createaccount' => false,
 273                                 'edit' => false,
 274                                 'read' => false,
 275                         ],
 276                 ],
 277         ];
 278
 279         /**
 280          * License types.
 281          *
 282          * @var array
 283          */
 284         public $licenses = [
 285                 'cc-by' => [
 286                         'url' => 'https://creativecommons.org/licenses/by/4.0/',
 287                         'icon' => '$wgResourceBasePath/resources/assets/licenses/cc-by.png',
 288                 ],
 289                 'cc-by-sa' => [
 290                         'url' => 'https://creativecommons.org/licenses/by-sa/4.0/',
 291                         'icon' => '$wgResourceBasePath/resources/assets/licenses/cc-by-sa.png',
 292                 ],
 293                 'cc-by-nc-sa' => [
 294                         'url' => 'https://creativecommons.org/licenses/by-nc-sa/4.0/',
 295                         'icon' => '$wgResourceBasePath/resources/assets/licenses/cc-by-nc-sa.png',
 296                 ],
 297                 'cc-0' => [
 298                         'url' => 'https://creativecommons.org/publicdomain/zero/1.0/',
 299                         'icon' => '$wgResourceBasePath/resources/assets/licenses/cc-0.png',
 300                 ],
 301                 'gfdl' => [
 302                         'url' => 'https://www.gnu.org/copyleft/fdl.html',
 303                         'icon' => '$wgResourceBasePath/resources/assets/licenses/gnu-fdl.png',
 304                 ],
 305                 'none' => [
 306                         'url' => '',
 307                         'icon' => '',
 308                         'text' => ''
 309                 ],
 310                 'cc-choose' => [
 311                         // Details will be filled in by the selector.
 312                         'url' => '',
 313                         'icon' => '',
 314                         'text' => '',
 315                 ],
 316         ];
 317
 318         /**
 319          * URL to mediawiki-announce subscription
 320          */
 321         protected $mediaWikiAnnounceUrl =
 322                 'https://lists.wikimedia.org/mailman/subscribe/mediawiki-announce';
 323
 324         /**
 325          * Supported language codes for Mailman
 326          */
 327         protected $mediaWikiAnnounceLanguages = [
 328                 'ca', 'cs', 'da', 'de', 'en', 'es', 'et', 'eu', 'fi', 'fr', 'hr', 'hu',
 329                 'it', 'ja', 'ko', 'lt', 'nl', 'no', 'pl', 'pt', 'pt-br', 'ro', 'ru',
 330                 'sl', 'sr', 'sv', 'tr', 'uk'
 331         ];
 332
 333         /**
 334          * UI interface for displaying a short message
 335          * The parameters are like parameters to wfMessage().
 336          * The messages will be in wikitext format, which will be converted to an
 337          * output format such as HTML or text before being sent to the user.
 338          * @param string $msg
 339          */
 340         abstract public function showMessage( $msg /*, ... */ );
 341
 342         /**
 343          * Same as showMessage(), but for displaying errors
 344          * @param string $msg
 345          */
 346         abstract public function showError( $msg /*, ... */ );
 347
 348         /**
 349          * Show a message to the installing user by using a Status object
 350          * @param Status $status
 351          */
 352         abstract public function showStatusMessage( Status $status );
 353
 354         /**
 355          * Constructs a Config object that contains configuration settings that should be
 356          * overwritten for the installation process.
 357          *
 358          * @since 1.27
 359          *
 360          * @param Config $baseConfig
 361          *
 362          * @return Config The config to use during installation.
 363          */
 364         public static function getInstallerConfig( Config $baseConfig ) {
 365                 $configOverrides = new HashConfig();
 366
 367                 // disable (problematic) object cache types explicitly, preserving all other (working) ones
 368                 // bug T113843
 369                 $emptyCache = [ 'class' => EmptyBagOStuff::class ];
 370
 371                 $objectCaches = [
 372                                 CACHE_NONE => $emptyCache,
 373                                 CACHE_DB => $emptyCache,
 374                                 CACHE_ANYTHING => $emptyCache,
 375                                 CACHE_MEMCACHED => $emptyCache,
 376                         ] + $baseConfig->get( 'ObjectCaches' );
 377
 378                 $configOverrides->set( 'ObjectCaches', $objectCaches );
 379
 380                 // Load the installer's i18n.
 381                 $messageDirs = $baseConfig->get( 'MessagesDirs' );
 382                 $messageDirs['MediawikiInstaller'] = __DIR__ . '/i18n';
 383
 384                 $configOverrides->set( 'MessagesDirs', $messageDirs );
 385
 386                 $installerConfig = new MultiConfig( [ $configOverrides, $baseConfig ] );
 387
 388                 // make sure we use the installer config as the main config
 389                 $configRegistry = $baseConfig->get( 'ConfigRegistry' );
 390                 $configRegistry['main'] = function () use ( $installerConfig ) {
 391                         return $installerConfig;
 392                 };
 393
 394                 $configOverrides->set( 'ConfigRegistry', $configRegistry );
 395
 396                 return $installerConfig;
 397         }
 398
 399         /**
 400          * Constructor, always call this from child classes.
 401          */
 402         public function __construct() {
 403                 global $wgMemc, $wgUser, $wgObjectCaches;
 404
 405                 $defaultConfig = new GlobalVarConfig(); // all the stuff from DefaultSettings.php
 406                 $installerConfig = self::getInstallerConfig( $defaultConfig );
 407
 408                 // Reset all services and inject config overrides
 409                 MediaWikiServices::resetGlobalInstance( $installerConfig );
 410
 411                 // Don't attempt to load user language options (T126177)
 412                 // This will be overridden in the web installer with the user-specified language
 413                 RequestContext::getMain()->setLanguage( 'en' );
 414
 415                 // Disable the i18n cache
 416                 // TODO: manage LocalisationCache singleton in MediaWikiServices
 417                 Language::getLocalisationCache()->disableBackend();
 418
 419                 // Disable all global services, since we don't have any configuration yet!
 420                 MediaWikiServices::disableStorageBackend();
 421
 422                 $mwServices = MediaWikiServices::getInstance();
 423                 // Disable object cache (otherwise CACHE_ANYTHING will try CACHE_DB and
 424                 // SqlBagOStuff will then throw since we just disabled wfGetDB)
 425                 $wgObjectCaches = $mwServices->getMainConfig()->get( 'ObjectCaches' );
 426                 $wgMemc = ObjectCache::getInstance( CACHE_NONE );
 427
 428                 // Disable interwiki lookup, to avoid database access during parses
 429                 $mwServices->redefineService( 'InterwikiLookup', function () {
 430                         return new NullInterwikiLookup();
 431                 } );
 432
 433                 // Having a user with id = 0 safeguards us from DB access via User::loadOptions().
 434                 $wgUser = User::newFromId( 0 );
 435                 RequestContext::getMain()->setUser( $wgUser );
 436
 437                 $this->settings = $this->internalDefaults;
 438
 439                 foreach ( $this->defaultVarNames as $var ) {
 440                         $this->settings[$var] = $GLOBALS[$var];
 441                 }
 442
 443                 $this->doEnvironmentPreps();
 444
 445                 $this->compiledDBs = [];
 446                 foreach ( self::getDBTypes() as $type ) {
 447                         $installer = $this->getDBInstaller( $type );
 448
 449                         if ( !$installer->isCompiled() ) {
 450                                 continue;
 451                         }
 452                         $this->compiledDBs[] = $type;
 453                 }
 454
 455                 $this->parserTitle = Title::newFromText( 'Installer' );
 456                 $this->parserOptions = new ParserOptions( $wgUser ); // language will be wrong :(
 457                 // Don't try to access DB before user language is initialised
 458                 $this->setParserLanguage( Language::factory( 'en' ) );
 459         }
 460
 461         /**
 462          * Get a list of known DB types.
 463          *
 464          * @return array
 465          */
 466         public static function getDBTypes() {
 467                 return self::$dbTypes;
 468         }
 469
 470         /**
 471          * Do initial checks of the PHP environment. Set variables according to
 472          * the observed environment.
 473          *
 474          * It's possible that this may be called under the CLI SAPI, not the SAPI
 475          * that the wiki will primarily run under. In that case, the subclass should
 476          * initialise variables such as wgScriptPath, before calling this function.
 477          *
 478          * Under the web subclass, it can already be assumed that PHP 5+ is in use
 479          * and that sessions are working.
 480          *
 481          * @return Status
 482          */
 483         public function doEnvironmentChecks() {
 484                 // Php version has already been checked by entry scripts
 485                 // Show message here for information purposes
 486                 if ( wfIsHHVM() ) {
 487                         $this->showMessage( 'config-env-hhvm', HHVM_VERSION );
 488                 } else {
 489                         $this->showMessage( 'config-env-php', PHP_VERSION );
 490                 }
 491
 492                 $good = true;
 493                 // Must go here because an old version of PCRE can prevent other checks from completing
 494                 list( $pcreVersion ) = explode( ' ', PCRE_VERSION, 2 );
 495                 if ( version_compare( $pcreVersion, self::MINIMUM_PCRE_VERSION, '<' ) ) {
 496                         $this->showError( 'config-pcre-old', self::MINIMUM_PCRE_VERSION, $pcreVersion );
 497                         $good = false;
 498                 } else {
 499                         foreach ( $this->envChecks as $check ) {
 500                                 $status = $this->$check();
 501                                 if ( $status === false ) {
 502                                         $good = false;
 503                                 }
 504                         }
 505                 }
 506
 507                 $this->setVar( '_Environment', $good );
 508
 509                 return $good ? Status::newGood() : Status::newFatal( 'config-env-bad' );
 510         }
 511
 512         public function doEnvironmentPreps() {
 513                 foreach ( $this->envPreps as $prep ) {
 514                         $this->$prep();
 515                 }
 516         }
 517
 518         /**
 519          * Set a MW configuration variable, or internal installer configuration variable.
 520          *
 521          * @param string $name
 522          * @param mixed $value
 523          */
 524         public function setVar( $name, $value ) {
 525                 $this->settings[$name] = $value;
 526         }
 527
 528         /**
 529          * Get an MW configuration variable, or internal installer configuration variable.
 530          * The defaults come from $GLOBALS (ultimately DefaultSettings.php).
 531          * Installer variables are typically prefixed by an underscore.
 532          *
 533          * @param string $name
 534          * @param mixed $default
 535          *
 536          * @return mixed
 537          */
 538         public function getVar( $name, $default = null ) {
 539                 if ( !isset( $this->settings[$name] ) ) {
 540                         return $default;
 541                 } else {
 542                         return $this->settings[$name];
 543                 }
 544         }
 545
 546         /**
 547          * Get a list of DBs supported by current PHP setup
 548          *
 549          * @return array
 550          */
 551         public function getCompiledDBs() {
 552                 return $this->compiledDBs;
 553         }
 554
 555         /**
 556          * Get the DatabaseInstaller class name for this type
 557          *
 558          * @param string $type database type ($wgDBtype)
 559          * @return string Class name
 560          * @since 1.30
 561          */
 562         public static function getDBInstallerClass( $type ) {
 563                 return ucfirst( $type ) . 'Installer';
 564         }
 565
 566         /**
 567          * Get an instance of DatabaseInstaller for the specified DB type.
 568          *
 569          * @param mixed $type DB installer for which is needed, false to use default.
 570          *
 571          * @return DatabaseInstaller
 572          */
 573         public function getDBInstaller( $type = false ) {
 574                 if ( !$type ) {
 575                         $type = $this->getVar( 'wgDBtype' );
 576                 }
 577
 578                 $type = strtolower( $type );
 579
 580                 if ( !isset( $this->dbInstallers[$type] ) ) {
 581                         $class = self::getDBInstallerClass( $type );
 582                         $this->dbInstallers[$type] = new $class( $this );
 583                 }
 584
 585                 return $this->dbInstallers[$type];
 586         }
 587
 588         /**
 589          * Determine if LocalSettings.php exists. If it does, return its variables.
 590          *
 591          * @return array|false
 592          */
 593         public static function getExistingLocalSettings() {
 594                 global $IP;
 595
 596                 // You might be wondering why this is here. Well if you don't do this
 597                 // then some poorly-formed extensions try to call their own classes
 598                 // after immediately registering them. We really need to get extension
 599                 // registration out of the global scope and into a real format.
 600                 // @see https://phabricator.wikimedia.org/T69440
 601                 global $wgAutoloadClasses;
 602                 $wgAutoloadClasses = [];
 603
 604                 // LocalSettings.php should not call functions, except wfLoadSkin/wfLoadExtensions
 605                 // Define the required globals here, to ensure, the functions can do it work correctly.
 606                 // phpcs:ignore MediaWiki.VariableAnalysis.UnusedGlobalVariables
 607                 global $wgExtensionDirectory, $wgStyleDirectory;
 608
 609                 Wikimedia\suppressWarnings();
 610                 $_lsExists = file_exists( "$IP/LocalSettings.php" );
 611                 Wikimedia\restoreWarnings();
 612
 613                 if ( !$_lsExists ) {
 614                         return false;
 615                 }
 616                 unset( $_lsExists );
 617
 618                 require "$IP/includes/DefaultSettings.php";
 619                 require "$IP/LocalSettings.php";
 620
 621                 return get_defined_vars();
 622         }
 623
 624         /**
 625          * Get a fake password for sending back to the user in HTML.
 626          * This is a security mechanism to avoid compromise of the password in the
 627          * event of session ID compromise.
 628          *
 629          * @param string $realPassword
 630          *
 631          * @return string
 632          */
 633         public function getFakePassword( $realPassword ) {
 634                 return str_repeat( '*', strlen( $realPassword ) );
 635         }
 636
 637         /**
 638          * Set a variable which stores a password, except if the new value is a
 639          * fake password in which case leave it as it is.
 640          *
 641          * @param string $name
 642          * @param mixed $value
 643          */
 644         public function setPassword( $name, $value ) {
 645                 if ( !preg_match( '/^\*+$/', $value ) ) {
 646                         $this->setVar( $name, $value );
 647                 }
 648         }
 649
 650         /**
 651          * On POSIX systems return the primary group of the webserver we're running under.
 652          * On other systems just returns null.
 653          *
 654          * This is used to advice the user that he should chgrp his mw-config/data/images directory as the
 655          * webserver user before he can install.
 656          *
 657          * Public because SqliteInstaller needs it, and doesn't subclass Installer.
 658          *
 659          * @return mixed
 660          */
 661         public static function maybeGetWebserverPrimaryGroup() {
 662                 if ( !function_exists( 'posix_getegid' ) || !function_exists( 'posix_getpwuid' ) ) {
 663                         # I don't know this, this isn't UNIX.
 664                         return null;
 665                 }
 666
 667                 # posix_getegid() *not* getmygid() because we want the group of the webserver,
 668                 # not whoever owns the current script.
 669                 $gid = posix_getegid();
 670                 $group = posix_getpwuid( $gid )['name'];
 671
 672                 return $group;
 673         }
 674
 675         /**
 676          * Convert wikitext $text to HTML.
 677          *
 678          * This is potentially error prone since many parser features require a complete
 679          * installed MW database. The solution is to just not use those features when you
 680          * write your messages. This appears to work well enough. Basic formatting and
 681          * external links work just fine.
 682          *
 683          * But in case a translator decides to throw in a "#ifexist" or internal link or
 684          * whatever, this function is guarded to catch the attempted DB access and to present
 685          * some fallback text.
 686          *
 687          * @param string $text
 688          * @param bool $lineStart
 689          * @return string
 690          */
 691         public function parse( $text, $lineStart = false ) {
 692                 global $wgParser;
 693
 694                 try {
 695                         $out = $wgParser->parse( $text, $this->parserTitle, $this->parserOptions, $lineStart );
 696                         $html = $out->getText( [
 697                                 'enableSectionEditLinks' => false,
 698                                 'unwrap' => true,
 699                         ] );
 700                 } catch ( MediaWiki\Services\ServiceDisabledException $e ) {
 701                         $html = '<!--DB access attempted during parse-->  ' . htmlspecialchars( $text );
 702                 }
 703
 704                 return $html;
 705         }
 706
 707         /**
 708          * @return ParserOptions
 709          */
 710         public function getParserOptions() {
 711                 return $this->parserOptions;
 712         }
 713
 714         public function disableLinkPopups() {
 715                 $this->parserOptions->setExternalLinkTarget( false );
 716         }
 717
 718         public function restoreLinkPopups() {
 719                 global $wgExternalLinkTarget;
 720                 $this->parserOptions->setExternalLinkTarget( $wgExternalLinkTarget );
 721         }
 722
 723         /**
 724          * Install step which adds a row to the site_stats table with appropriate
 725          * initial values.
 726          *
 727          * @param DatabaseInstaller $installer
 728          *
 729          * @return Status
 730          */
 731         public function populateSiteStats( DatabaseInstaller $installer ) {
 732                 $status = $installer->getConnection();
 733                 if ( !$status->isOK() ) {
 734                         return $status;
 735                 }
 736                 $status->value->insert(
 737                         'site_stats',
 738                         [
 739                                 'ss_row_id' => 1,
 740                                 'ss_total_edits' => 0,
 741                                 'ss_good_articles' => 0,
 742                                 'ss_total_pages' => 0,
 743                                 'ss_users' => 0,
 744                                 'ss_active_users' => 0,
 745                                 'ss_images' => 0
 746                         ],
 747                         __METHOD__, 'IGNORE'
 748                 );
 749
 750                 return Status::newGood();
 751         }
 752
 753         /**
 754          * Environment check for DB types.
 755          * @return bool
 756          */
 757         protected function envCheckDB() {
 758                 global $wgLang;
 759
 760                 $allNames = [];
 761
 762                 // Messages: config-type-mysql, config-type-postgres, config-type-oracle,
 763                 // config-type-sqlite
 764                 foreach ( self::getDBTypes() as $name ) {
 765                         $allNames[] = wfMessage( "config-type-$name" )->text();
 766                 }
 767
 768                 $databases = $this->getCompiledDBs();
 769
 770                 $databases = array_flip( $databases );
 771                 foreach ( array_keys( $databases ) as $db ) {
 772                         $installer = $this->getDBInstaller( $db );
 773                         $status = $installer->checkPrerequisites();
 774                         if ( !$status->isGood() ) {
 775                                 $this->showStatusMessage( $status );
 776                         }
 777                         if ( !$status->isOK() ) {
 778                                 unset( $databases[$db] );
 779                         }
 780                 }
 781                 $databases = array_flip( $databases );
 782                 if ( !$databases ) {
 783                         $this->showError( 'config-no-db', $wgLang->commaList( $allNames ), count( $allNames ) );
 784
 785                         // @todo FIXME: This only works for the web installer!
 786                         return false;
 787                 }
 788
 789                 return true;
 790         }
 791
 792         /**
 793          * Some versions of libxml+PHP break < and > encoding horribly
 794          * @return bool
 795          */
 796         protected function envCheckBrokenXML() {
 797                 $test = new PhpXmlBugTester();
 798                 if ( !$test->ok ) {
 799                         $this->showError( 'config-brokenlibxml' );
 800
 801                         return false;
 802                 }
 803
 804                 return true;
 805         }
 806
 807         /**
 808          * Environment check for the PCRE module.
 809          *
 810          * @note If this check were to fail, the parser would
 811          *   probably throw an exception before the result
 812          *   of this check is shown to the user.
 813          * @return bool
 814          */
 815         protected function envCheckPCRE() {
 816                 Wikimedia\suppressWarnings();
 817                 $regexd = preg_replace( '/[\x{0430}-\x{04FF}]/iu', '', '-АБВГД-' );
 818                 // Need to check for \p support too, as PCRE can be compiled
 819                 // with utf8 support, but not unicode property support.
 820                 // check that \p{Zs} (space separators) matches
 821                 // U+3000 (Ideographic space)
 822                 $regexprop = preg_replace( '/\p{Zs}/u', '', "-\u{3000}-" );
 823                 Wikimedia\restoreWarnings();
 824                 if ( $regexd != '--' || $regexprop != '--' ) {
 825                         $this->showError( 'config-pcre-no-utf8' );
 826
 827                         return false;
 828                 }
 829
 830                 return true;
 831         }
 832
 833         /**
 834          * Environment check for available memory.
 835          * @return bool
 836          */
 837         protected function envCheckMemory() {
 838                 $limit = ini_get( 'memory_limit' );
 839
 840                 if ( !$limit || $limit == -1 ) {
 841                         return true;
 842                 }
 843
 844                 $n = wfShorthandToInteger( $limit );
 845
 846                 if ( $n < $this->minMemorySize * 1024 * 1024 ) {
 847                         $newLimit = "{$this->minMemorySize}M";
 848
 849                         if ( ini_set( "memory_limit", $newLimit ) === false ) {
 850                                 $this->showMessage( 'config-memory-bad', $limit );
 851                         } else {
 852                                 $this->showMessage( 'config-memory-raised', $limit, $newLimit );
 853                                 $this->setVar( '_RaiseMemory', true );
 854                         }
 855                 }
 856
 857                 return true;
 858         }
 859
 860         /**
 861          * Environment check for compiled object cache types.
 862          */
 863         protected function envCheckCache() {
 864                 $caches = [];
 865                 foreach ( $this->objectCaches as $name => $function ) {
 866                         if ( function_exists( $function ) ) {
 867                                 $caches[$name] = true;
 868                         }
 869                 }
 870
 871                 if ( !$caches ) {
 872                         $key = 'config-no-cache-apcu';
 873                         $this->showMessage( $key );
 874                 }
 875
 876                 $this->setVar( '_Caches', $caches );
 877         }
 878
 879         /**
 880          * Scare user to death if they have mod_security or mod_security2
 881          * @return bool
 882          */
 883         protected function envCheckModSecurity() {
 884                 if ( self::apacheModulePresent( 'mod_security' )
 885                         || self::apacheModulePresent( 'mod_security2' ) ) {
 886                         $this->showMessage( 'config-mod-security' );
 887                 }
 888
 889                 return true;
 890         }
 891
 892         /**
 893          * Search for GNU diff3.
 894          * @return bool
 895          */
 896         protected function envCheckDiff3() {
 897                 $names = [ "gdiff3", "diff3" ];
 898                 if ( wfIsWindows() ) {
 899                         $names[] = 'diff3.exe';
 900                 }
 901                 $versionInfo = [ '--version', 'GNU diffutils' ];
 902
 903                 $diff3 = ExecutableFinder::findInDefaultPaths( $names, $versionInfo );
 904
 905                 if ( $diff3 ) {
 906                         $this->setVar( 'wgDiff3', $diff3 );
 907                 } else {
 908                         $this->setVar( 'wgDiff3', false );
 909                         $this->showMessage( 'config-diff3-bad' );
 910                 }
 911
 912                 return true;
 913         }
 914
 915         /**
 916          * Environment check for ImageMagick and GD.
 917          * @return bool
 918          */
 919         protected function envCheckGraphics() {
 920                 $names = wfIsWindows() ? 'convert.exe' : 'convert';
 921                 $versionInfo = [ '-version', 'ImageMagick' ];
 922                 $convert = ExecutableFinder::findInDefaultPaths( $names, $versionInfo );
 923
 924                 $this->setVar( 'wgImageMagickConvertCommand', '' );
 925                 if ( $convert ) {
 926                         $this->setVar( 'wgImageMagickConvertCommand', $convert );
 927                         $this->showMessage( 'config-imagemagick', $convert );
 928
 929                         return true;
 930                 } elseif ( function_exists( 'imagejpeg' ) ) {
 931                         $this->showMessage( 'config-gd' );
 932                 } else {
 933                         $this->showMessage( 'config-no-scaling' );
 934                 }
 935
 936                 return true;
 937         }
 938
 939         /**
 940          * Search for git.
 941          *
 942          * @since 1.22
 943          * @return bool
 944          */
 945         protected function envCheckGit() {
 946                 $names = wfIsWindows() ? 'git.exe' : 'git';
 947                 $versionInfo = [ '--version', 'git version' ];
 948
 949                 $git = ExecutableFinder::findInDefaultPaths( $names, $versionInfo );
 950
 951                 if ( $git ) {
 952                         $this->setVar( 'wgGitBin', $git );
 953                         $this->showMessage( 'config-git', $git );
 954                 } else {
 955                         $this->setVar( 'wgGitBin', false );
 956                         $this->showMessage( 'config-git-bad' );
 957                 }
 958
 959                 return true;
 960         }
 961
 962         /**
 963          * Environment check to inform user which server we've assumed.
 964          *
 965          * @return bool
 966          */
 967         protected function envCheckServer() {
 968                 $server = $this->envGetDefaultServer();
 969                 if ( $server !== null ) {
 970                         $this->showMessage( 'config-using-server', $server );
 971                 }
 972                 return true;
 973         }
 974
 975         /**
 976          * Environment check to inform user which paths we've assumed.
 977          *
 978          * @return bool
 979          */
 980         protected function envCheckPath() {
 981                 $this->showMessage(
 982                         'config-using-uri',
 983                         $this->getVar( 'wgServer' ),
 984                         $this->getVar( 'wgScriptPath' )
 985                 );
 986                 return true;
 987         }
 988
 989         /**
 990          * Environment check for preferred locale in shell
 991          * @return bool
 992          */
 993         protected function envCheckShellLocale() {
 994                 $os = php_uname( 's' );
 995                 $supported = [ 'Linux', 'SunOS', 'HP-UX', 'Darwin' ]; # Tested these
 996
 997                 if ( !in_array( $os, $supported ) ) {
 998                         return true;
 999                 }
1000
1001                 if ( Shell::isDisabled() ) {
1002                         return true;
1003                 }
1004
1005                 # Get a list of available locales.
1006                 $result = Shell::command( '/usr/bin/locale', '-a' )
1007                         ->execute();
1008
1009                 if ( $result->getExitCode() != 0 ) {
1010                         return true;
1011                 }
1012
1013                 $lines = $result->getStdout();
1014                 $lines = array_map( 'trim', explode( "\n", $lines ) );
1015                 $candidatesByLocale = [];
1016                 $candidatesByLang = [];
1017                 foreach ( $lines as $line ) {
1018                         if ( $line === '' ) {
1019                                 continue;
1020                         }
1021
1022                         if ( !preg_match( '/^([a-zA-Z]+)(_[a-zA-Z]+|)\.(utf8|UTF-8)(@[a-zA-Z_]*|)$/i', $line, $m ) ) {
1023                                 continue;
1024                         }
1025
1026                         list( , $lang, , , ) = $m;
1027
1028                         $candidatesByLocale[$m[0]] = $m;
1029                         $candidatesByLang[$lang][] = $m;
1030                 }
1031
1032                 # Try the current value of LANG.
1033                 if ( isset( $candidatesByLocale[getenv( 'LANG' )] ) ) {
1034                         $this->setVar( 'wgShellLocale', getenv( 'LANG' ) );
1035
1036                         return true;
1037                 }
1038
1039                 # Try the most common ones.
1040                 $commonLocales = [ 'C.UTF-8', 'en_US.UTF-8', 'en_US.utf8', 'de_DE.UTF-8', 'de_DE.utf8' ];
1041                 foreach ( $commonLocales as $commonLocale ) {
1042                         if ( isset( $candidatesByLocale[$commonLocale] ) ) {
1043                                 $this->setVar( 'wgShellLocale', $commonLocale );
1044
1045                                 return true;
1046                         }
1047                 }
1048
1049                 # Is there an available locale in the Wiki's language?
1050                 $wikiLang = $this->getVar( 'wgLanguageCode' );
1051
1052                 if ( isset( $candidatesByLang[$wikiLang] ) ) {
1053                         $m = reset( $candidatesByLang[$wikiLang] );
1054                         $this->setVar( 'wgShellLocale', $m[0] );
1055
1056                         return true;
1057                 }
1058
1059                 # Are there any at all?
1060                 if ( count( $candidatesByLocale ) ) {
1061                         $m = reset( $candidatesByLocale );
1062                         $this->setVar( 'wgShellLocale', $m[0] );
1063
1064                         return true;
1065                 }
1066
1067                 # Give up.
1068                 return true;
1069         }
1070
1071         /**
1072          * Environment check for the permissions of the uploads directory
1073          * @return bool
1074          */
1075         protected function envCheckUploadsDirectory() {
1076                 global $IP;
1077
1078                 $dir = $IP . '/images/';
1079                 $url = $this->getVar( 'wgServer' ) . $this->getVar( 'wgScriptPath' ) . '/images/';
1080                 $safe = !$this->dirIsExecutable( $dir, $url );
1081
1082                 if ( !$safe ) {
1083                         $this->showMessage( 'config-uploads-not-safe', $dir );
1084                 }
1085
1086                 return true;
1087         }
1088
1089         /**
1090          * Checks if suhosin.get.max_value_length is set, and if so generate
1091          * a warning because it decreases ResourceLoader performance.
1092          * @return bool
1093          */
1094         protected function envCheckSuhosinMaxValueLength() {
1095                 $maxValueLength = ini_get( 'suhosin.get.max_value_length' );
1096                 if ( $maxValueLength > 0 && $maxValueLength < 1024 ) {
1097                         // Only warn if the value is below the sane 1024
1098                         $this->showMessage( 'config-suhosin-max-value-length', $maxValueLength );
1099                 }
1100
1101                 return true;
1102         }
1103
1104         /**
1105          * Checks if we're running on 64 bit or not. 32 bit is becoming increasingly
1106          * hard to support, so let's at least warn people.
1107          *
1108          * @return bool
1109          */
1110         protected function envCheck64Bit() {
1111                 if ( PHP_INT_SIZE == 4 ) {
1112                         $this->showMessage( 'config-using-32bit' );
1113                 }
1114
1115                 return true;
1116         }
1117
1118         /**
1119          * Check the libicu version
1120          */
1121         protected function envCheckLibicu() {
1122                 /**
1123                  * This needs to be updated something that the latest libicu
1124                  * will properly normalize.  This normalization was found at
1125                  * https://www.unicode.org/versions/Unicode5.2.0/#Character_Additions
1126                  * Note that we use the hex representation to create the code
1127                  * points in order to avoid any Unicode-destroying during transit.
1128                  */
1129                 $not_normal_c = "\u{FA6C}";
1130                 $normal_c = "\u{242EE}";
1131
1132                 $useNormalizer = 'php';
1133                 $needsUpdate = false;
1134
1135                 if ( function_exists( 'normalizer_normalize' ) ) {
1136                         $useNormalizer = 'intl';
1137                         $intl = normalizer_normalize( $not_normal_c, Normalizer::FORM_C );
1138                         if ( $intl !== $normal_c ) {
1139                                 $needsUpdate = true;
1140                         }
1141                 }
1142
1143                 // Uses messages 'config-unicode-using-php' and 'config-unicode-using-intl'
1144                 if ( $useNormalizer === 'php' ) {
1145                         $this->showMessage( 'config-unicode-pure-php-warning' );
1146                 } else {
1147                         $this->showMessage( 'config-unicode-using-' . $useNormalizer );
1148                         if ( $needsUpdate ) {
1149                                 $this->showMessage( 'config-unicode-update-warning' );
1150                         }
1151                 }
1152         }
1153
1154         /**
1155          * Environment prep for the server hostname.
1156          */
1157         protected function envPrepServer() {
1158                 $server = $this->envGetDefaultServer();
1159                 if ( $server !== null ) {
1160                         $this->setVar( 'wgServer', $server );
1161                 }
1162         }
1163
1164         /**
1165          * Helper function to be called from envPrepServer()
1166          * @return string
1167          */
1168         abstract protected function envGetDefaultServer();
1169
1170         /**
1171          * Environment prep for setting $IP and $wgScriptPath.
1172          */
1173         protected function envPrepPath() {
1174                 global $IP;
1175                 $IP = dirname( dirname( __DIR__ ) );
1176                 $this->setVar( 'IP', $IP );
1177         }
1178
1179         /**
1180          * Checks if scripts located in the given directory can be executed via the given URL.
1181          *
1182          * Used only by environment checks.
1183          * @param string $dir
1184          * @param string $url
1185          * @return bool|int|string
1186          */
1187         public function dirIsExecutable( $dir, $url ) {
1188                 $scriptTypes = [
1189                         'php' => [
1190                                 "<?php echo 'ex' . 'ec';",
1191                                 "#!/var/env php\n<?php echo 'ex' . 'ec';",
1192                         ],
1193                 ];
1194
1195                 // it would be good to check other popular languages here, but it'll be slow.
1196
1197                 Wikimedia\suppressWarnings();
1198
1199                 foreach ( $scriptTypes as $ext => $contents ) {
1200                         foreach ( $contents as $source ) {
1201                                 $file = 'exectest.' . $ext;
1202
1203                                 if ( !file_put_contents( $dir . $file, $source ) ) {
1204                                         break;
1205                                 }
1206
1207                                 try {
1208                                         $text = Http::get( $url . $file, [ 'timeout' => 3 ], __METHOD__ );
1209                                 } catch ( Exception $e ) {
1210                                         // Http::get throws with allow_url_fopen = false and no curl extension.
1211                                         $text = null;
1212                                 }
1213                                 unlink( $dir . $file );
1214
1215                                 if ( $text == 'exec' ) {
1216                                         Wikimedia\restoreWarnings();
1217
1218                                         return $ext;
1219                                 }
1220                         }
1221                 }
1222
1223                 Wikimedia\restoreWarnings();
1224
1225                 return false;
1226         }
1227
1228         /**
1229          * Checks for presence of an Apache module. Works only if PHP is running as an Apache module, too.
1230          *
1231          * @param string $moduleName Name of module to check.
1232          * @return bool
1233          */
1234         public static function apacheModulePresent( $moduleName ) {
1235                 if ( function_exists( 'apache_get_modules' ) && in_array( $moduleName, apache_get_modules() ) ) {
1236                         return true;
1237                 }
1238                 // try it the hard way
1239                 ob_start();
1240                 phpinfo( INFO_MODULES );
1241                 $info = ob_get_clean();
1242
1243                 return strpos( $info, $moduleName ) !== false;
1244         }
1245
1246         /**
1247          * ParserOptions are constructed before we determined the language, so fix it
1248          *
1249          * @param Language $lang
1250          */
1251         public function setParserLanguage( $lang ) {
1252                 $this->parserOptions->setTargetLanguage( $lang );
1253                 $this->parserOptions->setUserLang( $lang );
1254         }
1255
1256         /**
1257          * Overridden by WebInstaller to provide lastPage parameters.
1258          * @param string $page
1259          * @return string
1260          */
1261         protected function getDocUrl( $page ) {
1262                 return "{$_SERVER['PHP_SELF']}?page=" . urlencode( $page );
1263         }
1264
1265         /**
1266          * Finds extensions that follow the format /$directory/Name/Name.php,
1267          * and returns an array containing the value for 'Name' for each found extension.
1268          *
1269          * Reasonable values for $directory include 'extensions' (the default) and 'skins'.
1270          *
1271          * @param string $directory Directory to search in
1272          * @return array [ $extName => [ 'screenshots' => [ '...' ] ]
1273          */
1274         public function findExtensions( $directory = 'extensions' ) {
1275                 if ( $this->getVar( 'IP' ) === null ) {
1276                         return [];
1277                 }
1278
1279                 $extDir = $this->getVar( 'IP' ) . '/' . $directory;
1280                 if ( !is_readable( $extDir ) || !is_dir( $extDir ) ) {
1281                         return [];
1282                 }
1283
1284                 // extensions -> extension.json, skins -> skin.json
1285                 $jsonFile = substr( $directory, 0, strlen( $directory ) - 1 ) . '.json';
1286
1287                 $dh = opendir( $extDir );
1288                 $exts = [];
1289                 while ( ( $file = readdir( $dh ) ) !== false ) {
1290                         if ( !is_dir( "$extDir/$file" ) ) {
1291                                 continue;
1292                         }
1293                         $fullJsonFile = "$extDir/$file/$jsonFile";
1294                         $isJson = file_exists( $fullJsonFile );
1295                         $isPhp = false;
1296                         if ( !$isJson ) {
1297                                 // Only fallback to PHP file if JSON doesn't exist
1298                                 $fullPhpFile = "$extDir/$file/$file.php";
1299                                 $isPhp = file_exists( $fullPhpFile );
1300                         }
1301                         if ( $isJson || $isPhp ) {
1302                                 // Extension exists. Now see if there are screenshots
1303                                 $exts[$file] = [];
1304                                 if ( is_dir( "$extDir/$file/screenshots" ) ) {
1305                                         $paths = glob( "$extDir/$file/screenshots/*.png" );
1306                                         foreach ( $paths as $path ) {
1307                                                 $exts[$file]['screenshots'][] = str_replace( $extDir, "../$directory", $path );
1308                                         }
1309
1310                                 }
1311                         }
1312                         if ( $isJson ) {
1313                                 $info = $this->readExtension( $fullJsonFile );
1314                                 if ( $info === false ) {
1315                                         continue;
1316                                 }
1317                                 $exts[$file] += $info;
1318                         }
1319                 }
1320                 closedir( $dh );
1321                 uksort( $exts, 'strnatcasecmp' );
1322
1323                 return $exts;
1324         }
1325
1326         /**
1327          * @param string $fullJsonFile
1328          * @param array $extDeps
1329          * @param array $skinDeps
1330          *
1331          * @return array|bool False if this extension can't be loaded
1332          */
1333         private function readExtension( $fullJsonFile, $extDeps = [], $skinDeps = [] ) {
1334                 $load = [
1335                         $fullJsonFile => 1
1336                 ];
1337                 if ( $extDeps ) {
1338                         $extDir = $this->getVar( 'IP' ) . '/extensions';
1339                         foreach ( $extDeps as $dep ) {
1340                                 $fname = "$extDir/$dep/extension.json";
1341                                 if ( !file_exists( $fname ) ) {
1342                                         return false;
1343                                 }
1344                                 $load[$fname] = 1;
1345                         }
1346                 }
1347                 if ( $skinDeps ) {
1348                         $skinDir = $this->getVar( 'IP' ) . '/skins';
1349                         foreach ( $skinDeps as $dep ) {
1350                                 $fname = "$skinDir/$dep/skin.json";
1351                                 if ( !file_exists( $fname ) ) {
1352                                         return false;
1353                                 }
1354                                 $load[$fname] = 1;
1355                         }
1356                 }
1357                 $registry = new ExtensionRegistry();
1358                 try {
1359                         $info = $registry->readFromQueue( $load );
1360                 } catch ( ExtensionDependencyError $e ) {
1361                         if ( $e->incompatibleCore || $e->incompatibleSkins
1362                                 || $e->incompatibleExtensions
1363                         ) {
1364                                 // If something is incompatible with a dependency, we have no real
1365                                 // option besides skipping it
1366                                 return false;
1367                         } elseif ( $e->missingExtensions || $e->missingSkins ) {
1368                                 // There's an extension missing in the dependency tree,
1369                                 // so add those to the dependency list and try again
1370                                 return $this->readExtension(
1371                                         $fullJsonFile,
1372                                         array_merge( $extDeps, $e->missingExtensions ),
1373                                         array_merge( $skinDeps, $e->missingSkins )
1374                                 );
1375                         }
1376                         // Some other kind of dependency error?
1377                         return false;
1378                 }
1379                 $ret = [];
1380                 // The order of credits will be the order of $load,
1381                 // so the first extension is the one we want to load,
1382                 // everything else is a dependency
1383                 $i = 0;
1384                 foreach ( $info['credits'] as $name => $credit ) {
1385                         $i++;
1386                         if ( $i == 1 ) {
1387                                 // Extension we want to load
1388                                 continue;
1389                         }
1390                         $type = basename( $credit['path'] ) === 'skin.json' ? 'skins' : 'extensions';
1391                         $ret['requires'][$type][] = $credit['name'];
1392                 }
1393                 $credits = array_values( $info['credits'] )[0];
1394                 if ( isset( $credits['url'] ) ) {
1395                         $ret['url'] = $credits['url'];
1396                 }
1397                 $ret['type'] = $credits['type'];
1398
1399                 return $ret;
1400         }
1401
1402         /**
1403          * Returns a default value to be used for $wgDefaultSkin: normally the one set in DefaultSettings,
1404          * but will fall back to another if the default skin is missing and some other one is present
1405          * instead.
1406          *
1407          * @param string[] $skinNames Names of installed skins.
1408          * @return string
1409          */
1410         public function getDefaultSkin( array $skinNames ) {
1411                 $defaultSkin = $GLOBALS['wgDefaultSkin'];
1412                 if ( !$skinNames || in_array( $defaultSkin, $skinNames ) ) {
1413                         return $defaultSkin;
1414                 } else {
1415                         return $skinNames[0];
1416                 }
1417         }
1418
1419         /**
1420          * Installs the auto-detected extensions.
1421          *
1422          * @return Status
1423          */
1424         protected function includeExtensions() {
1425                 global $IP;
1426                 $exts = $this->getVar( '_Extensions' );
1427                 $IP = $this->getVar( 'IP' );
1428
1429                 // Marker for DatabaseUpdater::loadExtensions so we don't
1430                 // double load extensions
1431                 define( 'MW_EXTENSIONS_LOADED', true );
1432
1433                 /**
1434                  * We need to include DefaultSettings before including extensions to avoid
1435                  * warnings about unset variables. However, the only thing we really
1436                  * want here is $wgHooks['LoadExtensionSchemaUpdates']. This won't work
1437                  * if the extension has hidden hook registration in $wgExtensionFunctions,
1438                  * but we're not opening that can of worms
1439                  * @see https://phabricator.wikimedia.org/T28857
1440                  */
1441                 global $wgAutoloadClasses;
1442                 $wgAutoloadClasses = [];
1443                 $queue = [];
1444
1445                 require "$IP/includes/DefaultSettings.php";
1446
1447                 foreach ( $exts as $e ) {
1448                         if ( file_exists( "$IP/extensions/$e/extension.json" ) ) {
1449                                 $queue["$IP/extensions/$e/extension.json"] = 1;
1450                         } else {
1451                                 require_once "$IP/extensions/$e/$e.php";
1452                         }
1453                 }
1454
1455                 $registry = new ExtensionRegistry();
1456                 $data = $registry->readFromQueue( $queue );
1457                 $wgAutoloadClasses += $data['autoload'];
1458
1459                 $hooksWeWant = isset( $wgHooks['LoadExtensionSchemaUpdates'] ) ?
1460                         /** @suppress PhanUndeclaredVariable $wgHooks is set by DefaultSettings */
1461                         $wgHooks['LoadExtensionSchemaUpdates'] : [];
1462
1463                 if ( isset( $data['globals']['wgHooks']['LoadExtensionSchemaUpdates'] ) ) {
1464                         $hooksWeWant = array_merge_recursive(
1465                                 $hooksWeWant,
1466                                 $data['globals']['wgHooks']['LoadExtensionSchemaUpdates']
1467                         );
1468                 }
1469                 // Unset everyone else's hooks. Lord knows what someone might be doing
1470                 // in ParserFirstCallInit (see T29171)
1471                 $GLOBALS['wgHooks'] = [ 'LoadExtensionSchemaUpdates' => $hooksWeWant ];
1472
1473                 return Status::newGood();
1474         }
1475
1476         /**
1477          * Get an array of install steps. Should always be in the format of
1478          * [
1479          *   'name'     => 'someuniquename',
1480          *   'callback' => [ $obj, 'method' ],
1481          * ]
1482          * There must be a config-install-$name message defined per step, which will
1483          * be shown on install.
1484          *
1485          * @param DatabaseInstaller $installer DatabaseInstaller so we can make callbacks
1486          * @return array
1487          */
1488         protected function getInstallSteps( DatabaseInstaller $installer ) {
1489                 $coreInstallSteps = [
1490                         [ 'name' => 'database', 'callback' => [ $installer, 'setupDatabase' ] ],
1491                         [ 'name' => 'tables', 'callback' => [ $installer, 'createTables' ] ],
1492                         [ 'name' => 'interwiki', 'callback' => [ $installer, 'populateInterwikiTable' ] ],
1493                         [ 'name' => 'stats', 'callback' => [ $this, 'populateSiteStats' ] ],
1494                         [ 'name' => 'keys', 'callback' => [ $this, 'generateKeys' ] ],
1495                         [ 'name' => 'updates', 'callback' => [ $installer, 'insertUpdateKeys' ] ],
1496                         [ 'name' => 'sysop', 'callback' => [ $this, 'createSysop' ] ],
1497                         [ 'name' => 'mainpage', 'callback' => [ $this, 'createMainpage' ] ],
1498                 ];
1499
1500                 // Build the array of install steps starting from the core install list,
1501                 // then adding any callbacks that wanted to attach after a given step
1502                 foreach ( $coreInstallSteps as $step ) {
1503                         $this->installSteps[] = $step;
1504                         if ( isset( $this->extraInstallSteps[$step['name']] ) ) {
1505                                 $this->installSteps = array_merge(
1506                                         $this->installSteps,
1507                                         $this->extraInstallSteps[$step['name']]
1508                                 );
1509                         }
1510                 }
1511
1512                 // Prepend any steps that want to be at the beginning
1513                 if ( isset( $this->extraInstallSteps['BEGINNING'] ) ) {
1514                         $this->installSteps = array_merge(
1515                                 $this->extraInstallSteps['BEGINNING'],
1516                                 $this->installSteps
1517                         );
1518                 }
1519
1520                 // Extensions should always go first, chance to tie into hooks and such
1521                 if ( count( $this->getVar( '_Extensions' ) ) ) {
1522                         array_unshift( $this->installSteps,
1523                                 [ 'name' => 'extensions', 'callback' => [ $this, 'includeExtensions' ] ]
1524                         );
1525                         $this->installSteps[] = [
1526                                 'name' => 'extension-tables',
1527                                 'callback' => [ $installer, 'createExtensionTables' ]
1528                         ];
1529                 }
1530
1531                 return $this->installSteps;
1532         }
1533
1534         /**
1535          * Actually perform the installation.
1536          *
1537          * @param callable $startCB A callback array for the beginning of each step
1538          * @param callable $endCB A callback array for the end of each step
1539          *
1540          * @return array Array of Status objects
1541          */
1542         public function performInstallation( $startCB, $endCB ) {
1543                 $installResults = [];
1544                 $installer = $this->getDBInstaller();
1545                 $installer->preInstall();
1546                 $steps = $this->getInstallSteps( $installer );
1547                 foreach ( $steps as $stepObj ) {
1548                         $name = $stepObj['name'];
1549                         call_user_func_array( $startCB, [ $name ] );
1550
1551                         // Perform the callback step
1552                         $status = call_user_func( $stepObj['callback'], $installer );
1553
1554                         // Output and save the results
1555                         call_user_func( $endCB, $name, $status );
1556                         $installResults[$name] = $status;
1557
1558                         // If we've hit some sort of fatal, we need to bail.
1559                         // Callback already had a chance to do output above.
1560                         if ( !$status->isOk() ) {
1561                                 break;
1562                         }
1563                 }
1564                 if ( $status->isOk() ) {
1565                         $this->showMessage(
1566                                 'config-install-success',
1567                                 $this->getVar( 'wgServer' ),
1568                                 $this->getVar( 'wgScriptPath' )
1569                         );
1570                         $this->setVar( '_InstallDone', true );
1571                 }
1572
1573                 return $installResults;
1574         }
1575
1576         /**
1577          * Generate $wgSecretKey. Will warn if we had to use an insecure random source.
1578          *
1579          * @return Status
1580          */
1581         public function generateKeys() {
1582                 $keys = [ 'wgSecretKey' => 64 ];
1583                 if ( strval( $this->getVar( 'wgUpgradeKey' ) ) === '' ) {
1584                         $keys['wgUpgradeKey'] = 16;
1585                 }
1586
1587                 return $this->doGenerateKeys( $keys );
1588         }
1589
1590         /**
1591          * Generate a secret value for variables using our CryptRand generator.
1592          * Produce a warning if the random source was insecure.
1593          *
1594          * @param array $keys
1595          * @return Status
1596          */
1597         protected function doGenerateKeys( $keys ) {
1598                 $status = Status::newGood();
1599
1600                 $strong = true;
1601                 foreach ( $keys as $name => $length ) {
1602                         $secretKey = MWCryptRand::generateHex( $length, true );
1603                         if ( !MWCryptRand::wasStrong() ) {
1604                                 $strong = false;
1605                         }
1606
1607                         $this->setVar( $name, $secretKey );
1608                 }
1609
1610                 if ( !$strong ) {
1611                         $names = array_keys( $keys );
1612                         $names = preg_replace( '/^(.*)$/', '\$$1', $names );
1613                         global $wgLang;
1614                         $status->warning( 'config-insecure-keys', $wgLang->listToText( $names ), count( $names ) );
1615                 }
1616
1617                 return $status;
1618         }
1619
1620         /**
1621          * Create the first user account, grant it sysop and bureaucrat rights
1622          *
1623          * @return Status
1624          */
1625         protected function createSysop() {
1626                 $name = $this->getVar( '_AdminName' );
1627                 $user = User::newFromName( $name );
1628
1629                 if ( !$user ) {
1630                         // We should've validated this earlier anyway!
1631                         return Status::newFatal( 'config-admin-error-user', $name );
1632                 }
1633
1634                 if ( $user->idForName() == 0 ) {
1635                         $user->addToDatabase();
1636
1637                         try {
1638                                 $user->setPassword( $this->getVar( '_AdminPassword' ) );
1639                         } catch ( PasswordError $pwe ) {
1640                                 return Status::newFatal( 'config-admin-error-password', $name, $pwe->getMessage() );
1641                         }
1642
1643                         $user->addGroup( 'sysop' );
1644                         $user->addGroup( 'bureaucrat' );
1645                         if ( $this->getVar( '_AdminEmail' ) ) {
1646                                 $user->setEmail( $this->getVar( '_AdminEmail' ) );
1647                         }
1648                         $user->saveSettings();
1649
1650                         // Update user count
1651                         $ssUpdate = SiteStatsUpdate::factory( [ 'users' => 1 ] );
1652                         $ssUpdate->doUpdate();
1653                 }
1654                 $status = Status::newGood();
1655
1656                 if ( $this->getVar( '_Subscribe' ) && $this->getVar( '_AdminEmail' ) ) {
1657                         $this->subscribeToMediaWikiAnnounce( $status );
1658                 }
1659
1660                 return $status;
1661         }
1662
1663         /**
1664          * @param Status $s
1665          */
1666         private function subscribeToMediaWikiAnnounce( Status $s ) {
1667                 $params = [
1668                         'email' => $this->getVar( '_AdminEmail' ),
1669                         'language' => 'en',
1670                         'digest' => 0
1671                 ];
1672
1673                 // Mailman doesn't support as many languages as we do, so check to make
1674                 // sure their selected language is available
1675                 $myLang = $this->getVar( '_UserLang' );
1676                 if ( in_array( $myLang, $this->mediaWikiAnnounceLanguages ) ) {
1677                         $myLang = $myLang == 'pt-br' ? 'pt_BR' : $myLang; // rewrite to Mailman's pt_BR
1678                         $params['language'] = $myLang;
1679                 }
1680
1681                 if ( MWHttpRequest::canMakeRequests() ) {
1682                         $res = MWHttpRequest::factory( $this->mediaWikiAnnounceUrl,
1683                                 [ 'method' => 'POST', 'postData' => $params ], __METHOD__ )->execute();
1684                         if ( !$res->isOK() ) {
1685                                 $s->warning( 'config-install-subscribe-fail', $res->getMessage() );
1686                         }
1687                 } else {
1688                         $s->warning( 'config-install-subscribe-notpossible' );
1689                 }
1690         }
1691
1692         /**
1693          * Insert Main Page with default content.
1694          *
1695          * @param DatabaseInstaller $installer
1696          * @return Status
1697          */
1698         protected function createMainpage( DatabaseInstaller $installer ) {
1699                 $status = Status::newGood();
1700                 $title = Title::newMainPage();
1701                 if ( $title->exists() ) {
1702                         $status->warning( 'config-install-mainpage-exists' );
1703                         return $status;
1704                 }
1705                 try {
1706                         $page = WikiPage::factory( $title );
1707                         $content = new WikitextContent(
1708                                 wfMessage( 'mainpagetext' )->inContentLanguage()->text() . "\n\n" .
1709                                 wfMessage( 'mainpagedocfooter' )->inContentLanguage()->text()
1710                         );
1711
1712                         $status = $page->doEditContent( $content,
1713                                 '',
1714                                 EDIT_NEW,
1715                                 false,
1716                                 User::newFromName( 'MediaWiki default' )
1717                         );
1718                 } catch ( Exception $e ) {
1719                         // using raw, because $wgShowExceptionDetails can not be set yet
1720                         $status->fatal( 'config-install-mainpage-failed', $e->getMessage() );
1721                 }
1722
1723                 return $status;
1724         }
1725
1726         /**
1727          * Override the necessary bits of the config to run an installation.
1728          */
1729         public static function overrideConfig() {
1730                 // Use PHP's built-in session handling, since MediaWiki's
1731                 // SessionHandler can't work before we have an object cache set up.
1732                 define( 'MW_NO_SESSION_HANDLER', 1 );
1733
1734                 // Don't access the database
1735                 $GLOBALS['wgUseDatabaseMessages'] = false;
1736                 // Don't cache langconv tables
1737                 $GLOBALS['wgLanguageConverterCacheType'] = CACHE_NONE;
1738                 // Debug-friendly
1739                 $GLOBALS['wgShowExceptionDetails'] = true;
1740                 // Don't break forms
1741                 $GLOBALS['wgExternalLinkTarget'] = '_blank';
1742
1743                 // Extended debugging
1744                 $GLOBALS['wgShowSQLErrors'] = true;
1745                 $GLOBALS['wgShowDBErrorBacktrace'] = true;
1746
1747                 // Allow multiple ob_flush() calls
1748                 $GLOBALS['wgDisableOutputCompression'] = true;
1749
1750                 // Use a sensible cookie prefix (not my_wiki)
1751                 $GLOBALS['wgCookiePrefix'] = 'mw_installer';
1752
1753                 // Some of the environment checks make shell requests, remove limits
1754                 $GLOBALS['wgMaxShellMemory'] = 0;
1755
1756                 // Override the default CookieSessionProvider with a dummy
1757                 // implementation that won't stomp on PHP's cookies.
1758                 $GLOBALS['wgSessionProviders'] = [
1759                         [
1760                                 'class' => InstallerSessionProvider::class,
1761                                 'args' => [ [
1762                                         'priority' => 1,
1763                                 ] ]
1764                         ]
1765                 ];
1766
1767                 // Don't try to use any object cache for SessionManager either.
1768                 $GLOBALS['wgSessionCacheType'] = CACHE_NONE;
1769         }
1770
1771         /**
1772          * Add an installation step following the given step.
1773          *
1774          * @param callable $callback A valid installation callback array, in this form:
1775          *    [ 'name' => 'some-unique-name', 'callback' => [ $obj, 'function' ] ];
1776          * @param string $findStep The step to find. Omit to put the step at the beginning
1777          */
1778         public function addInstallStep( $callback, $findStep = 'BEGINNING' ) {
1779                 $this->extraInstallSteps[$findStep][] = $callback;
1780         }
1781
1782         /**
1783          * Disable the time limit for execution.
1784          * Some long-running pages (Install, Upgrade) will want to do this
1785          */
1786         protected function disableTimeLimit() {
1787                 Wikimedia\suppressWarnings();
1788                 set_time_limit( 0 );
1789                 Wikimedia\restoreWarnings();
1790         }
1791 }