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                 $this->parserOptions->setTidy( true );
 458                 // Don't try to access DB before user language is initialised
 459                 $this->setParserLanguage( Language::factory( 'en' ) );
 460         }
 461
 462         /**
 463          * Get a list of known DB types.
 464          *
 465          * @return array
 466          */
 467         public static function getDBTypes() {
 468                 return self::$dbTypes;
 469         }
 470
 471         /**
 472          * Do initial checks of the PHP environment. Set variables according to
 473          * the observed environment.
 474          *
 475          * It's possible that this may be called under the CLI SAPI, not the SAPI
 476          * that the wiki will primarily run under. In that case, the subclass should
 477          * initialise variables such as wgScriptPath, before calling this function.
 478          *
 479          * Under the web subclass, it can already be assumed that PHP 5+ is in use
 480          * and that sessions are working.
 481          *
 482          * @return Status
 483          */
 484         public function doEnvironmentChecks() {
 485                 // Php version has already been checked by entry scripts
 486                 // Show message here for information purposes
 487                 if ( wfIsHHVM() ) {
 488                         $this->showMessage( 'config-env-hhvm', HHVM_VERSION );
 489                 } else {
 490                         $this->showMessage( 'config-env-php', PHP_VERSION );
 491                 }
 492
 493                 $good = true;
 494                 // Must go here because an old version of PCRE can prevent other checks from completing
 495                 list( $pcreVersion ) = explode( ' ', PCRE_VERSION, 2 );
 496                 if ( version_compare( $pcreVersion, self::MINIMUM_PCRE_VERSION, '<' ) ) {
 497                         $this->showError( 'config-pcre-old', self::MINIMUM_PCRE_VERSION, $pcreVersion );
 498                         $good = false;
 499                 } else {
 500                         foreach ( $this->envChecks as $check ) {
 501                                 $status = $this->$check();
 502                                 if ( $status === false ) {
 503                                         $good = false;
 504                                 }
 505                         }
 506                 }
 507
 508                 $this->setVar( '_Environment', $good );
 509
 510                 return $good ? Status::newGood() : Status::newFatal( 'config-env-bad' );
 511         }
 512
 513         public function doEnvironmentPreps() {
 514                 foreach ( $this->envPreps as $prep ) {
 515                         $this->$prep();
 516                 }
 517         }
 518
 519         /**
 520          * Set a MW configuration variable, or internal installer configuration variable.
 521          *
 522          * @param string $name
 523          * @param mixed $value
 524          */
 525         public function setVar( $name, $value ) {
 526                 $this->settings[$name] = $value;
 527         }
 528
 529         /**
 530          * Get an MW configuration variable, or internal installer configuration variable.
 531          * The defaults come from $GLOBALS (ultimately DefaultSettings.php).
 532          * Installer variables are typically prefixed by an underscore.
 533          *
 534          * @param string $name
 535          * @param mixed|null $default
 536          *
 537          * @return mixed
 538          */
 539         public function getVar( $name, $default = null ) {
 540                 return $this->settings[$name] ?? $default;
 541         }
 542
 543         /**
 544          * Get a list of DBs supported by current PHP setup
 545          *
 546          * @return array
 547          */
 548         public function getCompiledDBs() {
 549                 return $this->compiledDBs;
 550         }
 551
 552         /**
 553          * Get the DatabaseInstaller class name for this type
 554          *
 555          * @param string $type database type ($wgDBtype)
 556          * @return string Class name
 557          * @since 1.30
 558          */
 559         public static function getDBInstallerClass( $type ) {
 560                 return ucfirst( $type ) . 'Installer';
 561         }
 562
 563         /**
 564          * Get an instance of DatabaseInstaller for the specified DB type.
 565          *
 566          * @param mixed $type DB installer for which is needed, false to use default.
 567          *
 568          * @return DatabaseInstaller
 569          */
 570         public function getDBInstaller( $type = false ) {
 571                 if ( !$type ) {
 572                         $type = $this->getVar( 'wgDBtype' );
 573                 }
 574
 575                 $type = strtolower( $type );
 576
 577                 if ( !isset( $this->dbInstallers[$type] ) ) {
 578                         $class = self::getDBInstallerClass( $type );
 579                         $this->dbInstallers[$type] = new $class( $this );
 580                 }
 581
 582                 return $this->dbInstallers[$type];
 583         }
 584
 585         /**
 586          * Determine if LocalSettings.php exists. If it does, return its variables.
 587          *
 588          * @return array|false
 589          */
 590         public static function getExistingLocalSettings() {
 591                 global $IP;
 592
 593                 // You might be wondering why this is here. Well if you don't do this
 594                 // then some poorly-formed extensions try to call their own classes
 595                 // after immediately registering them. We really need to get extension
 596                 // registration out of the global scope and into a real format.
 597                 // @see https://phabricator.wikimedia.org/T69440
 598                 global $wgAutoloadClasses;
 599                 $wgAutoloadClasses = [];
 600
 601                 // LocalSettings.php should not call functions, except wfLoadSkin/wfLoadExtensions
 602                 // Define the required globals here, to ensure, the functions can do it work correctly.
 603                 // phpcs:ignore MediaWiki.VariableAnalysis.UnusedGlobalVariables
 604                 global $wgExtensionDirectory, $wgStyleDirectory;
 605
 606                 Wikimedia\suppressWarnings();
 607                 $_lsExists = file_exists( "$IP/LocalSettings.php" );
 608                 Wikimedia\restoreWarnings();
 609
 610                 if ( !$_lsExists ) {
 611                         return false;
 612                 }
 613                 unset( $_lsExists );
 614
 615                 require "$IP/includes/DefaultSettings.php";
 616                 require "$IP/LocalSettings.php";
 617
 618                 return get_defined_vars();
 619         }
 620
 621         /**
 622          * Get a fake password for sending back to the user in HTML.
 623          * This is a security mechanism to avoid compromise of the password in the
 624          * event of session ID compromise.
 625          *
 626          * @param string $realPassword
 627          *
 628          * @return string
 629          */
 630         public function getFakePassword( $realPassword ) {
 631                 return str_repeat( '*', strlen( $realPassword ) );
 632         }
 633
 634         /**
 635          * Set a variable which stores a password, except if the new value is a
 636          * fake password in which case leave it as it is.
 637          *
 638          * @param string $name
 639          * @param mixed $value
 640          */
 641         public function setPassword( $name, $value ) {
 642                 if ( !preg_match( '/^\*+$/', $value ) ) {
 643                         $this->setVar( $name, $value );
 644                 }
 645         }
 646
 647         /**
 648          * On POSIX systems return the primary group of the webserver we're running under.
 649          * On other systems just returns null.
 650          *
 651          * This is used to advice the user that he should chgrp his mw-config/data/images directory as the
 652          * webserver user before he can install.
 653          *
 654          * Public because SqliteInstaller needs it, and doesn't subclass Installer.
 655          *
 656          * @return mixed
 657          */
 658         public static function maybeGetWebserverPrimaryGroup() {
 659                 if ( !function_exists( 'posix_getegid' ) || !function_exists( 'posix_getpwuid' ) ) {
 660                         # I don't know this, this isn't UNIX.
 661                         return null;
 662                 }
 663
 664                 # posix_getegid() *not* getmygid() because we want the group of the webserver,
 665                 # not whoever owns the current script.
 666                 $gid = posix_getegid();
 667                 $group = posix_getpwuid( $gid )['name'];
 668
 669                 return $group;
 670         }
 671
 672         /**
 673          * Convert wikitext $text to HTML.
 674          *
 675          * This is potentially error prone since many parser features require a complete
 676          * installed MW database. The solution is to just not use those features when you
 677          * write your messages. This appears to work well enough. Basic formatting and
 678          * external links work just fine.
 679          *
 680          * But in case a translator decides to throw in a "#ifexist" or internal link or
 681          * whatever, this function is guarded to catch the attempted DB access and to present
 682          * some fallback text.
 683          *
 684          * @param string $text
 685          * @param bool $lineStart
 686          * @return string
 687          */
 688         public function parse( $text, $lineStart = false ) {
 689                 global $wgParser;
 690
 691                 try {
 692                         $out = $wgParser->parse( $text, $this->parserTitle, $this->parserOptions, $lineStart );
 693                         $html = $out->getText( [
 694                                 'enableSectionEditLinks' => false,
 695                                 'unwrap' => true,
 696                         ] );
 697                 } catch ( MediaWiki\Services\ServiceDisabledException $e ) {
 698                         $html = '<!--DB access attempted during parse-->  ' . htmlspecialchars( $text );
 699                 }
 700
 701                 return $html;
 702         }
 703
 704         /**
 705          * @return ParserOptions
 706          */
 707         public function getParserOptions() {
 708                 return $this->parserOptions;
 709         }
 710
 711         public function disableLinkPopups() {
 712                 $this->parserOptions->setExternalLinkTarget( false );
 713         }
 714
 715         public function restoreLinkPopups() {
 716                 global $wgExternalLinkTarget;
 717                 $this->parserOptions->setExternalLinkTarget( $wgExternalLinkTarget );
 718         }
 719
 720         /**
 721          * Install step which adds a row to the site_stats table with appropriate
 722          * initial values.
 723          *
 724          * @param DatabaseInstaller $installer
 725          *
 726          * @return Status
 727          */
 728         public function populateSiteStats( DatabaseInstaller $installer ) {
 729                 $status = $installer->getConnection();
 730                 if ( !$status->isOK() ) {
 731                         return $status;
 732                 }
 733                 $status->value->insert(
 734                         'site_stats',
 735                         [
 736                                 'ss_row_id' => 1,
 737                                 'ss_total_edits' => 0,
 738                                 'ss_good_articles' => 0,
 739                                 'ss_total_pages' => 0,
 740                                 'ss_users' => 0,
 741                                 'ss_active_users' => 0,
 742                                 'ss_images' => 0
 743                         ],
 744                         __METHOD__, 'IGNORE'
 745                 );
 746
 747                 return Status::newGood();
 748         }
 749
 750         /**
 751          * Environment check for DB types.
 752          * @return bool
 753          */
 754         protected function envCheckDB() {
 755                 global $wgLang;
 756
 757                 $allNames = [];
 758
 759                 // Messages: config-type-mysql, config-type-postgres, config-type-oracle,
 760                 // config-type-sqlite
 761                 foreach ( self::getDBTypes() as $name ) {
 762                         $allNames[] = wfMessage( "config-type-$name" )->text();
 763                 }
 764
 765                 $databases = $this->getCompiledDBs();
 766
 767                 $databases = array_flip( $databases );
 768                 foreach ( array_keys( $databases ) as $db ) {
 769                         $installer = $this->getDBInstaller( $db );
 770                         $status = $installer->checkPrerequisites();
 771                         if ( !$status->isGood() ) {
 772                                 $this->showStatusMessage( $status );
 773                         }
 774                         if ( !$status->isOK() ) {
 775                                 unset( $databases[$db] );
 776                         }
 777                 }
 778                 $databases = array_flip( $databases );
 779                 if ( !$databases ) {
 780                         $this->showError( 'config-no-db', $wgLang->commaList( $allNames ), count( $allNames ) );
 781
 782                         // @todo FIXME: This only works for the web installer!
 783                         return false;
 784                 }
 785
 786                 return true;
 787         }
 788
 789         /**
 790          * Some versions of libxml+PHP break < and > encoding horribly
 791          * @return bool
 792          */
 793         protected function envCheckBrokenXML() {
 794                 $test = new PhpXmlBugTester();
 795                 if ( !$test->ok ) {
 796                         $this->showError( 'config-brokenlibxml' );
 797
 798                         return false;
 799                 }
 800
 801                 return true;
 802         }
 803
 804         /**
 805          * Environment check for the PCRE module.
 806          *
 807          * @note If this check were to fail, the parser would
 808          *   probably throw an exception before the result
 809          *   of this check is shown to the user.
 810          * @return bool
 811          */
 812         protected function envCheckPCRE() {
 813                 Wikimedia\suppressWarnings();
 814                 $regexd = preg_replace( '/[\x{0430}-\x{04FF}]/iu', '', '-АБВГД-' );
 815                 // Need to check for \p support too, as PCRE can be compiled
 816                 // with utf8 support, but not unicode property support.
 817                 // check that \p{Zs} (space separators) matches
 818                 // U+3000 (Ideographic space)
 819                 $regexprop = preg_replace( '/\p{Zs}/u', '', "-\u{3000}-" );
 820                 Wikimedia\restoreWarnings();
 821                 if ( $regexd != '--' || $regexprop != '--' ) {
 822                         $this->showError( 'config-pcre-no-utf8' );
 823
 824                         return false;
 825                 }
 826
 827                 return true;
 828         }
 829
 830         /**
 831          * Environment check for available memory.
 832          * @return bool
 833          */
 834         protected function envCheckMemory() {
 835                 $limit = ini_get( 'memory_limit' );
 836
 837                 if ( !$limit || $limit == -1 ) {
 838                         return true;
 839                 }
 840
 841                 $n = wfShorthandToInteger( $limit );
 842
 843                 if ( $n < $this->minMemorySize * 1024 * 1024 ) {
 844                         $newLimit = "{$this->minMemorySize}M";
 845
 846                         if ( ini_set( "memory_limit", $newLimit ) === false ) {
 847                                 $this->showMessage( 'config-memory-bad', $limit );
 848                         } else {
 849                                 $this->showMessage( 'config-memory-raised', $limit, $newLimit );
 850                                 $this->setVar( '_RaiseMemory', true );
 851                         }
 852                 }
 853
 854                 return true;
 855         }
 856
 857         /**
 858          * Environment check for compiled object cache types.
 859          */
 860         protected function envCheckCache() {
 861                 $caches = [];
 862                 foreach ( $this->objectCaches as $name => $function ) {
 863                         if ( function_exists( $function ) ) {
 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                 if ( Shell::isDisabled() ) {
 999                         return true;
1000                 }
1001
1002                 # Get a list of available locales.
1003                 $result = Shell::command( '/usr/bin/locale', '-a' )
1004                         ->execute();
1005
1006                 if ( $result->getExitCode() != 0 ) {
1007                         return true;
1008                 }
1009
1010                 $lines = $result->getStdout();
1011                 $lines = array_map( 'trim', explode( "\n", $lines ) );
1012                 $candidatesByLocale = [];
1013                 $candidatesByLang = [];
1014                 foreach ( $lines as $line ) {
1015                         if ( $line === '' ) {
1016                                 continue;
1017                         }
1018
1019                         if ( !preg_match( '/^([a-zA-Z]+)(_[a-zA-Z]+|)\.(utf8|UTF-8)(@[a-zA-Z_]*|)$/i', $line, $m ) ) {
1020                                 continue;
1021                         }
1022
1023                         list( , $lang, , , ) = $m;
1024
1025                         $candidatesByLocale[$m[0]] = $m;
1026                         $candidatesByLang[$lang][] = $m;
1027                 }
1028
1029                 # Try the current value of LANG.
1030                 if ( isset( $candidatesByLocale[getenv( 'LANG' )] ) ) {
1031                         $this->setVar( 'wgShellLocale', getenv( 'LANG' ) );
1032
1033                         return true;
1034                 }
1035
1036                 # Try the most common ones.
1037                 $commonLocales = [ 'C.UTF-8', 'en_US.UTF-8', 'en_US.utf8', 'de_DE.UTF-8', 'de_DE.utf8' ];
1038                 foreach ( $commonLocales as $commonLocale ) {
1039                         if ( isset( $candidatesByLocale[$commonLocale] ) ) {
1040                                 $this->setVar( 'wgShellLocale', $commonLocale );
1041
1042                                 return true;
1043                         }
1044                 }
1045
1046                 # Is there an available locale in the Wiki's language?
1047                 $wikiLang = $this->getVar( 'wgLanguageCode' );
1048
1049                 if ( isset( $candidatesByLang[$wikiLang] ) ) {
1050                         $m = reset( $candidatesByLang[$wikiLang] );
1051                         $this->setVar( 'wgShellLocale', $m[0] );
1052
1053                         return true;
1054                 }
1055
1056                 # Are there any at all?
1057                 if ( count( $candidatesByLocale ) ) {
1058                         $m = reset( $candidatesByLocale );
1059                         $this->setVar( 'wgShellLocale', $m[0] );
1060
1061                         return true;
1062                 }
1063
1064                 # Give up.
1065                 return true;
1066         }
1067
1068         /**
1069          * Environment check for the permissions of the uploads directory
1070          * @return bool
1071          */
1072         protected function envCheckUploadsDirectory() {
1073                 global $IP;
1074
1075                 $dir = $IP . '/images/';
1076                 $url = $this->getVar( 'wgServer' ) . $this->getVar( 'wgScriptPath' ) . '/images/';
1077                 $safe = !$this->dirIsExecutable( $dir, $url );
1078
1079                 if ( !$safe ) {
1080                         $this->showMessage( 'config-uploads-not-safe', $dir );
1081                 }
1082
1083                 return true;
1084         }
1085
1086         /**
1087          * Checks if suhosin.get.max_value_length is set, and if so generate
1088          * a warning because it decreases ResourceLoader performance.
1089          * @return bool
1090          */
1091         protected function envCheckSuhosinMaxValueLength() {
1092                 $maxValueLength = ini_get( 'suhosin.get.max_value_length' );
1093                 if ( $maxValueLength > 0 && $maxValueLength < 1024 ) {
1094                         // Only warn if the value is below the sane 1024
1095                         $this->showMessage( 'config-suhosin-max-value-length', $maxValueLength );
1096                 }
1097
1098                 return true;
1099         }
1100
1101         /**
1102          * Checks if we're running on 64 bit or not. 32 bit is becoming increasingly
1103          * hard to support, so let's at least warn people.
1104          *
1105          * @return bool
1106          */
1107         protected function envCheck64Bit() {
1108                 if ( PHP_INT_SIZE == 4 ) {
1109                         $this->showMessage( 'config-using-32bit' );
1110                 }
1111
1112                 return true;
1113         }
1114
1115         /**
1116          * Check the libicu version
1117          */
1118         protected function envCheckLibicu() {
1119                 /**
1120                  * This needs to be updated something that the latest libicu
1121                  * will properly normalize.  This normalization was found at
1122                  * https://www.unicode.org/versions/Unicode5.2.0/#Character_Additions
1123                  * Note that we use the hex representation to create the code
1124                  * points in order to avoid any Unicode-destroying during transit.
1125                  */
1126                 $not_normal_c = "\u{FA6C}";
1127                 $normal_c = "\u{242EE}";
1128
1129                 $useNormalizer = 'php';
1130                 $needsUpdate = false;
1131
1132                 if ( function_exists( 'normalizer_normalize' ) ) {
1133                         $useNormalizer = 'intl';
1134                         $intl = normalizer_normalize( $not_normal_c, Normalizer::FORM_C );
1135                         if ( $intl !== $normal_c ) {
1136                                 $needsUpdate = true;
1137                         }
1138                 }
1139
1140                 // Uses messages 'config-unicode-using-php' and 'config-unicode-using-intl'
1141                 if ( $useNormalizer === 'php' ) {
1142                         $this->showMessage( 'config-unicode-pure-php-warning' );
1143                 } else {
1144                         $this->showMessage( 'config-unicode-using-' . $useNormalizer );
1145                         if ( $needsUpdate ) {
1146                                 $this->showMessage( 'config-unicode-update-warning' );
1147                         }
1148                 }
1149         }
1150
1151         /**
1152          * Environment prep for the server hostname.
1153          */
1154         protected function envPrepServer() {
1155                 $server = $this->envGetDefaultServer();
1156                 if ( $server !== null ) {
1157                         $this->setVar( 'wgServer', $server );
1158                 }
1159         }
1160
1161         /**
1162          * Helper function to be called from envPrepServer()
1163          * @return string
1164          */
1165         abstract protected function envGetDefaultServer();
1166
1167         /**
1168          * Environment prep for setting $IP and $wgScriptPath.
1169          */
1170         protected function envPrepPath() {
1171                 global $IP;
1172                 $IP = dirname( dirname( __DIR__ ) );
1173                 $this->setVar( 'IP', $IP );
1174         }
1175
1176         /**
1177          * Checks if scripts located in the given directory can be executed via the given URL.
1178          *
1179          * Used only by environment checks.
1180          * @param string $dir
1181          * @param string $url
1182          * @return bool|int|string
1183          */
1184         public function dirIsExecutable( $dir, $url ) {
1185                 $scriptTypes = [
1186                         'php' => [
1187                                 "<?php echo 'ex' . 'ec';",
1188                                 "#!/var/env php\n<?php echo 'ex' . 'ec';",
1189                         ],
1190                 ];
1191
1192                 // it would be good to check other popular languages here, but it'll be slow.
1193
1194                 Wikimedia\suppressWarnings();
1195
1196                 foreach ( $scriptTypes as $ext => $contents ) {
1197                         foreach ( $contents as $source ) {
1198                                 $file = 'exectest.' . $ext;
1199
1200                                 if ( !file_put_contents( $dir . $file, $source ) ) {
1201                                         break;
1202                                 }
1203
1204                                 try {
1205                                         $text = Http::get( $url . $file, [ 'timeout' => 3 ], __METHOD__ );
1206                                 } catch ( Exception $e ) {
1207                                         // Http::get throws with allow_url_fopen = false and no curl extension.
1208                                         $text = null;
1209                                 }
1210                                 unlink( $dir . $file );
1211
1212                                 if ( $text == 'exec' ) {
1213                                         Wikimedia\restoreWarnings();
1214
1215                                         return $ext;
1216                                 }
1217                         }
1218                 }
1219
1220                 Wikimedia\restoreWarnings();
1221
1222                 return false;
1223         }
1224
1225         /**
1226          * Checks for presence of an Apache module. Works only if PHP is running as an Apache module, too.
1227          *
1228          * @param string $moduleName Name of module to check.
1229          * @return bool
1230          */
1231         public static function apacheModulePresent( $moduleName ) {
1232                 if ( function_exists( 'apache_get_modules' ) && in_array( $moduleName, apache_get_modules() ) ) {
1233                         return true;
1234                 }
1235                 // try it the hard way
1236                 ob_start();
1237                 phpinfo( INFO_MODULES );
1238                 $info = ob_get_clean();
1239
1240                 return strpos( $info, $moduleName ) !== false;
1241         }
1242
1243         /**
1244          * ParserOptions are constructed before we determined the language, so fix it
1245          *
1246          * @param Language $lang
1247          */
1248         public function setParserLanguage( $lang ) {
1249                 $this->parserOptions->setTargetLanguage( $lang );
1250                 $this->parserOptions->setUserLang( $lang );
1251         }
1252
1253         /**
1254          * Overridden by WebInstaller to provide lastPage parameters.
1255          * @param string $page
1256          * @return string
1257          */
1258         protected function getDocUrl( $page ) {
1259                 return "{$_SERVER['PHP_SELF']}?page=" . urlencode( $page );
1260         }
1261
1262         /**
1263          * Find extensions or skins in a subdirectory of $IP.
1264          * Returns an array containing the value for 'Name' for each found extension.
1265          *
1266          * @param string $directory Directory to search in, relative to $IP, must be either "extensions"
1267          *     or "skins"
1268          * @return array [ $extName => [ 'screenshots' => [ '...' ] ]
1269          */
1270         public function findExtensions( $directory = 'extensions' ) {
1271                 switch ( $directory ) {
1272                         case 'extensions':
1273                                 return $this->findExtensionsByType( 'extension', 'extensions' );
1274                         case 'skins':
1275                                 return $this->findExtensionsByType( 'skin', 'skins' );
1276                         default:
1277                                 throw new InvalidArgumentException( "Invalid extension type" );
1278                 }
1279         }
1280
1281         /**
1282          * Find extensions or skins, and return an array containing the value for 'Name' for each found
1283          * extension.
1284          *
1285          * @param string $type Either "extension" or "skin"
1286          * @param string $directory Directory to search in, relative to $IP
1287          * @return array [ $extName => [ 'screenshots' => [ '...' ] ]
1288          */
1289         protected function findExtensionsByType( $type = 'extension', $directory = 'extensions' ) {
1290                 if ( $this->getVar( 'IP' ) === null ) {
1291                         return [];
1292                 }
1293
1294                 $extDir = $this->getVar( 'IP' ) . '/' . $directory;
1295                 if ( !is_readable( $extDir ) || !is_dir( $extDir ) ) {
1296                         return [];
1297                 }
1298
1299                 $dh = opendir( $extDir );
1300                 $exts = [];
1301                 while ( ( $file = readdir( $dh ) ) !== false ) {
1302                         if ( !is_dir( "$extDir/$file" ) ) {
1303                                 continue;
1304                         }
1305                         $status = $this->getExtensionInfo( $type, $directory, $file );
1306                         if ( $status->isOK() ) {
1307                                 $exts[$file] = $status->value;
1308                         }
1309                 }
1310                 closedir( $dh );
1311                 uksort( $exts, 'strnatcasecmp' );
1312
1313                 return $exts;
1314         }
1315
1316         /**
1317          * @param string $type Either "extension" or "skin"
1318          * @param string $parentRelPath The parent directory relative to $IP
1319          * @param string $name The extension or skin name
1320          * @return Status An object containing an error list. If there were no errors, an associative
1321          *     array of information about the extension can be found in $status->value.
1322          */
1323         protected function getExtensionInfo( $type, $parentRelPath, $name ) {
1324                 if ( $this->getVar( 'IP' ) === null ) {
1325                         throw new Exception( 'Cannot find extensions since the IP variable is not yet set' );
1326                 }
1327                 if ( $type !== 'extension' && $type !== 'skin' ) {
1328                         throw new InvalidArgumentException( "Invalid extension type" );
1329                 }
1330                 $absDir = $this->getVar( 'IP' ) . "/$parentRelPath/$name";
1331                 $relDir = "../$parentRelPath/$name";
1332                 if ( !is_dir( $absDir ) ) {
1333                         return Status::newFatal( 'config-extension-not-found', $name );
1334                 }
1335                 $jsonFile = $type . '.json';
1336                 $fullJsonFile = "$absDir/$jsonFile";
1337                 $isJson = file_exists( $fullJsonFile );
1338                 $isPhp = false;
1339                 if ( !$isJson ) {
1340                         // Only fallback to PHP file if JSON doesn't exist
1341                         $fullPhpFile = "$absDir/$name.php";
1342                         $isPhp = file_exists( $fullPhpFile );
1343                 }
1344                 if ( !$isJson && !$isPhp ) {
1345                         return Status::newFatal( 'config-extension-not-found', $name );
1346                 }
1347
1348                 // Extension exists. Now see if there are screenshots
1349                 $info = [];
1350                 if ( is_dir( "$absDir/screenshots" ) ) {
1351                         $paths = glob( "$absDir/screenshots/*.png" );
1352                         foreach ( $paths as $path ) {
1353                                 $info['screenshots'][] = str_replace( $absDir, $relDir, $path );
1354                         }
1355                 }
1356
1357                 if ( $isJson ) {
1358                         $jsonStatus = $this->readExtension( $fullJsonFile );
1359                         if ( !$jsonStatus->isOK() ) {
1360                                 return $jsonStatus;
1361                         }
1362                         $info += $jsonStatus->value;
1363                 }
1364
1365                 return Status::newGood( $info );
1366         }
1367
1368         /**
1369          * @param string $fullJsonFile
1370          * @param array $extDeps
1371          * @param array $skinDeps
1372          *
1373          * @return Status On success, an array of extension information is in $status->value. On
1374          *    failure, the Status object will have an error list.
1375          */
1376         private function readExtension( $fullJsonFile, $extDeps = [], $skinDeps = [] ) {
1377                 $load = [
1378                         $fullJsonFile => 1
1379                 ];
1380                 if ( $extDeps ) {
1381                         $extDir = $this->getVar( 'IP' ) . '/extensions';
1382                         foreach ( $extDeps as $dep ) {
1383                                 $fname = "$extDir/$dep/extension.json";
1384                                 if ( !file_exists( $fname ) ) {
1385                                         return Status::newFatal( 'config-extension-not-found', $dep );
1386                                 }
1387                                 $load[$fname] = 1;
1388                         }
1389                 }
1390                 if ( $skinDeps ) {
1391                         $skinDir = $this->getVar( 'IP' ) . '/skins';
1392                         foreach ( $skinDeps as $dep ) {
1393                                 $fname = "$skinDir/$dep/skin.json";
1394                                 if ( !file_exists( $fname ) ) {
1395                                         return Status::newFatal( 'config-extension-not-found', $dep );
1396                                 }
1397                                 $load[$fname] = 1;
1398                         }
1399                 }
1400                 $registry = new ExtensionRegistry();
1401                 try {
1402                         $info = $registry->readFromQueue( $load );
1403                 } catch ( ExtensionDependencyError $e ) {
1404                         if ( $e->incompatibleCore || $e->incompatibleSkins
1405                                 || $e->incompatibleExtensions
1406                         ) {
1407                                 // If something is incompatible with a dependency, we have no real
1408                                 // option besides skipping it
1409                                 return Status::newFatal( 'config-extension-dependency',
1410                                         basename( dirname( $fullJsonFile ) ), $e->getMessage() );
1411                         } elseif ( $e->missingExtensions || $e->missingSkins ) {
1412                                 // There's an extension missing in the dependency tree,
1413                                 // so add those to the dependency list and try again
1414                                 return $this->readExtension(
1415                                         $fullJsonFile,
1416                                         array_merge( $extDeps, $e->missingExtensions ),
1417                                         array_merge( $skinDeps, $e->missingSkins )
1418                                 );
1419                         }
1420                         // Some other kind of dependency error?
1421                         return Status::newFatal( 'config-extension-dependency',
1422                                 basename( dirname( $fullJsonFile ) ), $e->getMessage() );
1423                 }
1424                 $ret = [];
1425                 // The order of credits will be the order of $load,
1426                 // so the first extension is the one we want to load,
1427                 // everything else is a dependency
1428                 $i = 0;
1429                 foreach ( $info['credits'] as $name => $credit ) {
1430                         $i++;
1431                         if ( $i == 1 ) {
1432                                 // Extension we want to load
1433                                 continue;
1434                         }
1435                         $type = basename( $credit['path'] ) === 'skin.json' ? 'skins' : 'extensions';
1436                         $ret['requires'][$type][] = $credit['name'];
1437                 }
1438                 $credits = array_values( $info['credits'] )[0];
1439                 if ( isset( $credits['url'] ) ) {
1440                         $ret['url'] = $credits['url'];
1441                 }
1442                 $ret['type'] = $credits['type'];
1443
1444                 return Status::newGood( $ret );
1445         }
1446
1447         /**
1448          * Returns a default value to be used for $wgDefaultSkin: normally the one set in DefaultSettings,
1449          * but will fall back to another if the default skin is missing and some other one is present
1450          * instead.
1451          *
1452          * @param string[] $skinNames Names of installed skins.
1453          * @return string
1454          */
1455         public function getDefaultSkin( array $skinNames ) {
1456                 $defaultSkin = $GLOBALS['wgDefaultSkin'];
1457                 if ( !$skinNames || in_array( $defaultSkin, $skinNames ) ) {
1458                         return $defaultSkin;
1459                 } else {
1460                         return $skinNames[0];
1461                 }
1462         }
1463
1464         /**
1465          * Installs the auto-detected extensions.
1466          *
1467          * @return Status
1468          */
1469         protected function includeExtensions() {
1470                 global $IP;
1471                 $exts = $this->getVar( '_Extensions' );
1472                 $IP = $this->getVar( 'IP' );
1473
1474                 // Marker for DatabaseUpdater::loadExtensions so we don't
1475                 // double load extensions
1476                 define( 'MW_EXTENSIONS_LOADED', true );
1477
1478                 /**
1479                  * We need to include DefaultSettings before including extensions to avoid
1480                  * warnings about unset variables. However, the only thing we really
1481                  * want here is $wgHooks['LoadExtensionSchemaUpdates']. This won't work
1482                  * if the extension has hidden hook registration in $wgExtensionFunctions,
1483                  * but we're not opening that can of worms
1484                  * @see https://phabricator.wikimedia.org/T28857
1485                  */
1486                 global $wgAutoloadClasses;
1487                 $wgAutoloadClasses = [];
1488                 $queue = [];
1489
1490                 require "$IP/includes/DefaultSettings.php";
1491
1492                 foreach ( $exts as $e ) {
1493                         if ( file_exists( "$IP/extensions/$e/extension.json" ) ) {
1494                                 $queue["$IP/extensions/$e/extension.json"] = 1;
1495                         } else {
1496                                 require_once "$IP/extensions/$e/$e.php";
1497                         }
1498                 }
1499
1500                 $registry = new ExtensionRegistry();
1501                 $data = $registry->readFromQueue( $queue );
1502                 $wgAutoloadClasses += $data['autoload'];
1503
1504                 /** @suppress PhanUndeclaredVariable $wgHooks is set by DefaultSettings */
1505                 $hooksWeWant = $wgHooks['LoadExtensionSchemaUpdates'] ?? [];
1506
1507                 if ( isset( $data['globals']['wgHooks']['LoadExtensionSchemaUpdates'] ) ) {
1508                         $hooksWeWant = array_merge_recursive(
1509                                 $hooksWeWant,
1510                                 $data['globals']['wgHooks']['LoadExtensionSchemaUpdates']
1511                         );
1512                 }
1513                 // Unset everyone else's hooks. Lord knows what someone might be doing
1514                 // in ParserFirstCallInit (see T29171)
1515                 $GLOBALS['wgHooks'] = [ 'LoadExtensionSchemaUpdates' => $hooksWeWant ];
1516
1517                 return Status::newGood();
1518         }
1519
1520         /**
1521          * Get an array of install steps. Should always be in the format of
1522          * [
1523          *   'name'     => 'someuniquename',
1524          *   'callback' => [ $obj, 'method' ],
1525          * ]
1526          * There must be a config-install-$name message defined per step, which will
1527          * be shown on install.
1528          *
1529          * @param DatabaseInstaller $installer DatabaseInstaller so we can make callbacks
1530          * @return array
1531          */
1532         protected function getInstallSteps( DatabaseInstaller $installer ) {
1533                 $coreInstallSteps = [
1534                         [ 'name' => 'database', 'callback' => [ $installer, 'setupDatabase' ] ],
1535                         [ 'name' => 'tables', 'callback' => [ $installer, 'createTables' ] ],
1536                         [ 'name' => 'interwiki', 'callback' => [ $installer, 'populateInterwikiTable' ] ],
1537                         [ 'name' => 'stats', 'callback' => [ $this, 'populateSiteStats' ] ],
1538                         [ 'name' => 'keys', 'callback' => [ $this, 'generateKeys' ] ],
1539                         [ 'name' => 'updates', 'callback' => [ $installer, 'insertUpdateKeys' ] ],
1540                         [ 'name' => 'sysop', 'callback' => [ $this, 'createSysop' ] ],
1541                         [ 'name' => 'mainpage', 'callback' => [ $this, 'createMainpage' ] ],
1542                 ];
1543
1544                 // Build the array of install steps starting from the core install list,
1545                 // then adding any callbacks that wanted to attach after a given step
1546                 foreach ( $coreInstallSteps as $step ) {
1547                         $this->installSteps[] = $step;
1548                         if ( isset( $this->extraInstallSteps[$step['name']] ) ) {
1549                                 $this->installSteps = array_merge(
1550                                         $this->installSteps,
1551                                         $this->extraInstallSteps[$step['name']]
1552                                 );
1553                         }
1554                 }
1555
1556                 // Prepend any steps that want to be at the beginning
1557                 if ( isset( $this->extraInstallSteps['BEGINNING'] ) ) {
1558                         $this->installSteps = array_merge(
1559                                 $this->extraInstallSteps['BEGINNING'],
1560                                 $this->installSteps
1561                         );
1562                 }
1563
1564                 // Extensions should always go first, chance to tie into hooks and such
1565                 if ( count( $this->getVar( '_Extensions' ) ) ) {
1566                         array_unshift( $this->installSteps,
1567                                 [ 'name' => 'extensions', 'callback' => [ $this, 'includeExtensions' ] ]
1568                         );
1569                         $this->installSteps[] = [
1570                                 'name' => 'extension-tables',
1571                                 'callback' => [ $installer, 'createExtensionTables' ]
1572                         ];
1573                 }
1574
1575                 return $this->installSteps;
1576         }
1577
1578         /**
1579          * Actually perform the installation.
1580          *
1581          * @param callable $startCB A callback array for the beginning of each step
1582          * @param callable $endCB A callback array for the end of each step
1583          *
1584          * @return array Array of Status objects
1585          */
1586         public function performInstallation( $startCB, $endCB ) {
1587                 $installResults = [];
1588                 $installer = $this->getDBInstaller();
1589                 $installer->preInstall();
1590                 $steps = $this->getInstallSteps( $installer );
1591                 foreach ( $steps as $stepObj ) {
1592                         $name = $stepObj['name'];
1593                         call_user_func_array( $startCB, [ $name ] );
1594
1595                         // Perform the callback step
1596                         $status = call_user_func( $stepObj['callback'], $installer );
1597
1598                         // Output and save the results
1599                         call_user_func( $endCB, $name, $status );
1600                         $installResults[$name] = $status;
1601
1602                         // If we've hit some sort of fatal, we need to bail.
1603                         // Callback already had a chance to do output above.
1604                         if ( !$status->isOk() ) {
1605                                 break;
1606                         }
1607                 }
1608                 if ( $status->isOk() ) {
1609                         $this->showMessage(
1610                                 'config-install-success',
1611                                 $this->getVar( 'wgServer' ),
1612                                 $this->getVar( 'wgScriptPath' )
1613                         );
1614                         $this->setVar( '_InstallDone', true );
1615                 }
1616
1617                 return $installResults;
1618         }
1619
1620         /**
1621          * Generate $wgSecretKey. Will warn if we had to use an insecure random source.
1622          *
1623          * @return Status
1624          */
1625         public function generateKeys() {
1626                 $keys = [ 'wgSecretKey' => 64 ];
1627                 if ( strval( $this->getVar( 'wgUpgradeKey' ) ) === '' ) {
1628                         $keys['wgUpgradeKey'] = 16;
1629                 }
1630
1631                 return $this->doGenerateKeys( $keys );
1632         }
1633
1634         /**
1635          * Generate a secret value for variables using our CryptRand generator.
1636          * Produce a warning if the random source was insecure.
1637          *
1638          * @param array $keys
1639          * @return Status
1640          */
1641         protected function doGenerateKeys( $keys ) {
1642                 $status = Status::newGood();
1643
1644                 foreach ( $keys as $name => $length ) {
1645                         $secretKey = MWCryptRand::generateHex( $length );
1646                         $this->setVar( $name, $secretKey );
1647                 }
1648
1649                 return $status;
1650         }
1651
1652         /**
1653          * Create the first user account, grant it sysop, bureaucrat and interface-admin rights
1654          *
1655          * @return Status
1656          */
1657         protected function createSysop() {
1658                 $name = $this->getVar( '_AdminName' );
1659                 $user = User::newFromName( $name );
1660
1661                 if ( !$user ) {
1662                         // We should've validated this earlier anyway!
1663                         return Status::newFatal( 'config-admin-error-user', $name );
1664                 }
1665
1666                 if ( $user->idForName() == 0 ) {
1667                         $user->addToDatabase();
1668
1669                         try {
1670                                 $user->setPassword( $this->getVar( '_AdminPassword' ) );
1671                         } catch ( PasswordError $pwe ) {
1672                                 return Status::newFatal( 'config-admin-error-password', $name, $pwe->getMessage() );
1673                         }
1674
1675                         $user->addGroup( 'sysop' );
1676                         $user->addGroup( 'bureaucrat' );
1677                         $user->addGroup( 'interface-admin' );
1678                         if ( $this->getVar( '_AdminEmail' ) ) {
1679                                 $user->setEmail( $this->getVar( '_AdminEmail' ) );
1680                         }
1681                         $user->saveSettings();
1682
1683                         // Update user count
1684                         $ssUpdate = SiteStatsUpdate::factory( [ 'users' => 1 ] );
1685                         $ssUpdate->doUpdate();
1686                 }
1687                 $status = Status::newGood();
1688
1689                 if ( $this->getVar( '_Subscribe' ) && $this->getVar( '_AdminEmail' ) ) {
1690                         $this->subscribeToMediaWikiAnnounce( $status );
1691                 }
1692
1693                 return $status;
1694         }
1695
1696         /**
1697          * @param Status $s
1698          */
1699         private function subscribeToMediaWikiAnnounce( Status $s ) {
1700                 $params = [
1701                         'email' => $this->getVar( '_AdminEmail' ),
1702                         'language' => 'en',
1703                         'digest' => 0
1704                 ];
1705
1706                 // Mailman doesn't support as many languages as we do, so check to make
1707                 // sure their selected language is available
1708                 $myLang = $this->getVar( '_UserLang' );
1709                 if ( in_array( $myLang, $this->mediaWikiAnnounceLanguages ) ) {
1710                         $myLang = $myLang == 'pt-br' ? 'pt_BR' : $myLang; // rewrite to Mailman's pt_BR
1711                         $params['language'] = $myLang;
1712                 }
1713
1714                 if ( MWHttpRequest::canMakeRequests() ) {
1715                         $res = MWHttpRequest::factory( $this->mediaWikiAnnounceUrl,
1716                                 [ 'method' => 'POST', 'postData' => $params ], __METHOD__ )->execute();
1717                         if ( !$res->isOK() ) {
1718                                 $s->warning( 'config-install-subscribe-fail', $res->getMessage() );
1719                         }
1720                 } else {
1721                         $s->warning( 'config-install-subscribe-notpossible' );
1722                 }
1723         }
1724
1725         /**
1726          * Insert Main Page with default content.
1727          *
1728          * @param DatabaseInstaller $installer
1729          * @return Status
1730          */
1731         protected function createMainpage( DatabaseInstaller $installer ) {
1732                 $status = Status::newGood();
1733                 $title = Title::newMainPage();
1734                 if ( $title->exists() ) {
1735                         $status->warning( 'config-install-mainpage-exists' );
1736                         return $status;
1737                 }
1738                 try {
1739                         $page = WikiPage::factory( $title );
1740                         $content = new WikitextContent(
1741                                 wfMessage( 'mainpagetext' )->inContentLanguage()->text() . "\n\n" .
1742                                 wfMessage( 'mainpagedocfooter' )->inContentLanguage()->text()
1743                         );
1744
1745                         $status = $page->doEditContent( $content,
1746                                 '',
1747                                 EDIT_NEW,
1748                                 false,
1749                                 User::newFromName( 'MediaWiki default' )
1750                         );
1751                 } catch ( Exception $e ) {
1752                         // using raw, because $wgShowExceptionDetails can not be set yet
1753                         $status->fatal( 'config-install-mainpage-failed', $e->getMessage() );
1754                 }
1755
1756                 return $status;
1757         }
1758
1759         /**
1760          * Override the necessary bits of the config to run an installation.
1761          */
1762         public static function overrideConfig() {
1763                 // Use PHP's built-in session handling, since MediaWiki's
1764                 // SessionHandler can't work before we have an object cache set up.
1765                 define( 'MW_NO_SESSION_HANDLER', 1 );
1766
1767                 // Don't access the database
1768                 $GLOBALS['wgUseDatabaseMessages'] = false;
1769                 // Don't cache langconv tables
1770                 $GLOBALS['wgLanguageConverterCacheType'] = CACHE_NONE;
1771                 // Debug-friendly
1772                 $GLOBALS['wgShowExceptionDetails'] = true;
1773                 $GLOBALS['wgShowHostnames'] = true;
1774                 // Don't break forms
1775                 $GLOBALS['wgExternalLinkTarget'] = '_blank';
1776
1777                 // Allow multiple ob_flush() calls
1778                 $GLOBALS['wgDisableOutputCompression'] = true;
1779
1780                 // Use a sensible cookie prefix (not my_wiki)
1781                 $GLOBALS['wgCookiePrefix'] = 'mw_installer';
1782
1783                 // Some of the environment checks make shell requests, remove limits
1784                 $GLOBALS['wgMaxShellMemory'] = 0;
1785
1786                 // Override the default CookieSessionProvider with a dummy
1787                 // implementation that won't stomp on PHP's cookies.
1788                 $GLOBALS['wgSessionProviders'] = [
1789                         [
1790                                 'class' => InstallerSessionProvider::class,
1791                                 'args' => [ [
1792                                         'priority' => 1,
1793                                 ] ]
1794                         ]
1795                 ];
1796
1797                 // Don't try to use any object cache for SessionManager either.
1798                 $GLOBALS['wgSessionCacheType'] = CACHE_NONE;
1799         }
1800
1801         /**
1802          * Add an installation step following the given step.
1803          *
1804          * @param callable $callback A valid installation callback array, in this form:
1805          *    [ 'name' => 'some-unique-name', 'callback' => [ $obj, 'function' ] ];
1806          * @param string $findStep The step to find. Omit to put the step at the beginning
1807          */
1808         public function addInstallStep( $callback, $findStep = 'BEGINNING' ) {
1809                 $this->extraInstallSteps[$findStep][] = $callback;
1810         }
1811
1812         /**
1813          * Disable the time limit for execution.
1814          * Some long-running pages (Install, Upgrade) will want to do this
1815          */
1816         protected function disableTimeLimit() {
1817                 Wikimedia\suppressWarnings();
1818                 set_time_limit( 0 );
1819                 Wikimedia\restoreWarnings();
1820         }
1821 }