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                 if ( !isset( $this->settings[$name] ) ) {
 541                         return $default;
 542                 } else {
 543                         return $this->settings[$name];
 544                 }
 545         }
 546
 547         /**
 548          * Get a list of DBs supported by current PHP setup
 549          *
 550          * @return array
 551          */
 552         public function getCompiledDBs() {
 553                 return $this->compiledDBs;
 554         }
 555
 556         /**
 557          * Get the DatabaseInstaller class name for this type
 558          *
 559          * @param string $type database type ($wgDBtype)
 560          * @return string Class name
 561          * @since 1.30
 562          */
 563         public static function getDBInstallerClass( $type ) {
 564                 return ucfirst( $type ) . 'Installer';
 565         }
 566
 567         /**
 568          * Get an instance of DatabaseInstaller for the specified DB type.
 569          *
 570          * @param mixed $type DB installer for which is needed, false to use default.
 571          *
 572          * @return DatabaseInstaller
 573          */
 574         public function getDBInstaller( $type = false ) {
 575                 if ( !$type ) {
 576                         $type = $this->getVar( 'wgDBtype' );
 577                 }
 578
 579                 $type = strtolower( $type );
 580
 581                 if ( !isset( $this->dbInstallers[$type] ) ) {
 582                         $class = self::getDBInstallerClass( $type );
 583                         $this->dbInstallers[$type] = new $class( $this );
 584                 }
 585
 586                 return $this->dbInstallers[$type];
 587         }
 588
 589         /**
 590          * Determine if LocalSettings.php exists. If it does, return its variables.
 591          *
 592          * @return array|false
 593          */
 594         public static function getExistingLocalSettings() {
 595                 global $IP;
 596
 597                 // You might be wondering why this is here. Well if you don't do this
 598                 // then some poorly-formed extensions try to call their own classes
 599                 // after immediately registering them. We really need to get extension
 600                 // registration out of the global scope and into a real format.
 601                 // @see https://phabricator.wikimedia.org/T69440
 602                 global $wgAutoloadClasses;
 603                 $wgAutoloadClasses = [];
 604
 605                 // LocalSettings.php should not call functions, except wfLoadSkin/wfLoadExtensions
 606                 // Define the required globals here, to ensure, the functions can do it work correctly.
 607                 // phpcs:ignore MediaWiki.VariableAnalysis.UnusedGlobalVariables
 608                 global $wgExtensionDirectory, $wgStyleDirectory;
 609
 610                 Wikimedia\suppressWarnings();
 611                 $_lsExists = file_exists( "$IP/LocalSettings.php" );
 612                 Wikimedia\restoreWarnings();
 613
 614                 if ( !$_lsExists ) {
 615                         return false;
 616                 }
 617                 unset( $_lsExists );
 618
 619                 require "$IP/includes/DefaultSettings.php";
 620                 require "$IP/LocalSettings.php";
 621
 622                 return get_defined_vars();
 623         }
 624
 625         /**
 626          * Get a fake password for sending back to the user in HTML.
 627          * This is a security mechanism to avoid compromise of the password in the
 628          * event of session ID compromise.
 629          *
 630          * @param string $realPassword
 631          *
 632          * @return string
 633          */
 634         public function getFakePassword( $realPassword ) {
 635                 return str_repeat( '*', strlen( $realPassword ) );
 636         }
 637
 638         /**
 639          * Set a variable which stores a password, except if the new value is a
 640          * fake password in which case leave it as it is.
 641          *
 642          * @param string $name
 643          * @param mixed $value
 644          */
 645         public function setPassword( $name, $value ) {
 646                 if ( !preg_match( '/^\*+$/', $value ) ) {
 647                         $this->setVar( $name, $value );
 648                 }
 649         }
 650
 651         /**
 652          * On POSIX systems return the primary group of the webserver we're running under.
 653          * On other systems just returns null.
 654          *
 655          * This is used to advice the user that he should chgrp his mw-config/data/images directory as the
 656          * webserver user before he can install.
 657          *
 658          * Public because SqliteInstaller needs it, and doesn't subclass Installer.
 659          *
 660          * @return mixed
 661          */
 662         public static function maybeGetWebserverPrimaryGroup() {
 663                 if ( !function_exists( 'posix_getegid' ) || !function_exists( 'posix_getpwuid' ) ) {
 664                         # I don't know this, this isn't UNIX.
 665                         return null;
 666                 }
 667
 668                 # posix_getegid() *not* getmygid() because we want the group of the webserver,
 669                 # not whoever owns the current script.
 670                 $gid = posix_getegid();
 671                 $group = posix_getpwuid( $gid )['name'];
 672
 673                 return $group;
 674         }
 675
 676         /**
 677          * Convert wikitext $text to HTML.
 678          *
 679          * This is potentially error prone since many parser features require a complete
 680          * installed MW database. The solution is to just not use those features when you
 681          * write your messages. This appears to work well enough. Basic formatting and
 682          * external links work just fine.
 683          *
 684          * But in case a translator decides to throw in a "#ifexist" or internal link or
 685          * whatever, this function is guarded to catch the attempted DB access and to present
 686          * some fallback text.
 687          *
 688          * @param string $text
 689          * @param bool $lineStart
 690          * @return string
 691          */
 692         public function parse( $text, $lineStart = false ) {
 693                 global $wgParser;
 694
 695                 try {
 696                         $out = $wgParser->parse( $text, $this->parserTitle, $this->parserOptions, $lineStart );
 697                         $html = $out->getText( [
 698                                 'enableSectionEditLinks' => false,
 699                                 'unwrap' => true,
 700                         ] );
 701                 } catch ( MediaWiki\Services\ServiceDisabledException $e ) {
 702                         $html = '<!--DB access attempted during parse-->  ' . htmlspecialchars( $text );
 703                 }
 704
 705                 return $html;
 706         }
 707
 708         /**
 709          * @return ParserOptions
 710          */
 711         public function getParserOptions() {
 712                 return $this->parserOptions;
 713         }
 714
 715         public function disableLinkPopups() {
 716                 $this->parserOptions->setExternalLinkTarget( false );
 717         }
 718
 719         public function restoreLinkPopups() {
 720                 global $wgExternalLinkTarget;
 721                 $this->parserOptions->setExternalLinkTarget( $wgExternalLinkTarget );
 722         }
 723
 724         /**
 725          * Install step which adds a row to the site_stats table with appropriate
 726          * initial values.
 727          *
 728          * @param DatabaseInstaller $installer
 729          *
 730          * @return Status
 731          */
 732         public function populateSiteStats( DatabaseInstaller $installer ) {
 733                 $status = $installer->getConnection();
 734                 if ( !$status->isOK() ) {
 735                         return $status;
 736                 }
 737                 $status->value->insert(
 738                         'site_stats',
 739                         [
 740                                 'ss_row_id' => 1,
 741                                 'ss_total_edits' => 0,
 742                                 'ss_good_articles' => 0,
 743                                 'ss_total_pages' => 0,
 744                                 'ss_users' => 0,
 745                                 'ss_active_users' => 0,
 746                                 'ss_images' => 0
 747                         ],
 748                         __METHOD__, 'IGNORE'
 749                 );
 750
 751                 return Status::newGood();
 752         }
 753
 754         /**
 755          * Environment check for DB types.
 756          * @return bool
 757          */
 758         protected function envCheckDB() {
 759                 global $wgLang;
 760
 761                 $allNames = [];
 762
 763                 // Messages: config-type-mysql, config-type-postgres, config-type-oracle,
 764                 // config-type-sqlite
 765                 foreach ( self::getDBTypes() as $name ) {
 766                         $allNames[] = wfMessage( "config-type-$name" )->text();
 767                 }
 768
 769                 $databases = $this->getCompiledDBs();
 770
 771                 $databases = array_flip( $databases );
 772                 foreach ( array_keys( $databases ) as $db ) {
 773                         $installer = $this->getDBInstaller( $db );
 774                         $status = $installer->checkPrerequisites();
 775                         if ( !$status->isGood() ) {
 776                                 $this->showStatusMessage( $status );
 777                         }
 778                         if ( !$status->isOK() ) {
 779                                 unset( $databases[$db] );
 780                         }
 781                 }
 782                 $databases = array_flip( $databases );
 783                 if ( !$databases ) {
 784                         $this->showError( 'config-no-db', $wgLang->commaList( $allNames ), count( $allNames ) );
 785
 786                         // @todo FIXME: This only works for the web installer!
 787                         return false;
 788                 }
 789
 790                 return true;
 791         }
 792
 793         /**
 794          * Some versions of libxml+PHP break < and > encoding horribly
 795          * @return bool
 796          */
 797         protected function envCheckBrokenXML() {
 798                 $test = new PhpXmlBugTester();
 799                 if ( !$test->ok ) {
 800                         $this->showError( 'config-brokenlibxml' );
 801
 802                         return false;
 803                 }
 804
 805                 return true;
 806         }
 807
 808         /**
 809          * Environment check for the PCRE module.
 810          *
 811          * @note If this check were to fail, the parser would
 812          *   probably throw an exception before the result
 813          *   of this check is shown to the user.
 814          * @return bool
 815          */
 816         protected function envCheckPCRE() {
 817                 Wikimedia\suppressWarnings();
 818                 $regexd = preg_replace( '/[\x{0430}-\x{04FF}]/iu', '', '-АБВГД-' );
 819                 // Need to check for \p support too, as PCRE can be compiled
 820                 // with utf8 support, but not unicode property support.
 821                 // check that \p{Zs} (space separators) matches
 822                 // U+3000 (Ideographic space)
 823                 $regexprop = preg_replace( '/\p{Zs}/u', '', "-\u{3000}-" );
 824                 Wikimedia\restoreWarnings();
 825                 if ( $regexd != '--' || $regexprop != '--' ) {
 826                         $this->showError( 'config-pcre-no-utf8' );
 827
 828                         return false;
 829                 }
 830
 831                 return true;
 832         }
 833
 834         /**
 835          * Environment check for available memory.
 836          * @return bool
 837          */
 838         protected function envCheckMemory() {
 839                 $limit = ini_get( 'memory_limit' );
 840
 841                 if ( !$limit || $limit == -1 ) {
 842                         return true;
 843                 }
 844
 845                 $n = wfShorthandToInteger( $limit );
 846
 847                 if ( $n < $this->minMemorySize * 1024 * 1024 ) {
 848                         $newLimit = "{$this->minMemorySize}M";
 849
 850                         if ( ini_set( "memory_limit", $newLimit ) === false ) {
 851                                 $this->showMessage( 'config-memory-bad', $limit );
 852                         } else {
 853                                 $this->showMessage( 'config-memory-raised', $limit, $newLimit );
 854                                 $this->setVar( '_RaiseMemory', true );
 855                         }
 856                 }
 857
 858                 return true;
 859         }
 860
 861         /**
 862          * Environment check for compiled object cache types.
 863          */
 864         protected function envCheckCache() {
 865                 $caches = [];
 866                 foreach ( $this->objectCaches as $name => $function ) {
 867                         if ( function_exists( $function ) ) {
 868                                 $caches[$name] = true;
 869                         }
 870                 }
 871
 872                 if ( !$caches ) {
 873                         $key = 'config-no-cache-apcu';
 874                         $this->showMessage( $key );
 875                 }
 876
 877                 $this->setVar( '_Caches', $caches );
 878         }
 879
 880         /**
 881          * Scare user to death if they have mod_security or mod_security2
 882          * @return bool
 883          */
 884         protected function envCheckModSecurity() {
 885                 if ( self::apacheModulePresent( 'mod_security' )
 886                         || self::apacheModulePresent( 'mod_security2' ) ) {
 887                         $this->showMessage( 'config-mod-security' );
 888                 }
 889
 890                 return true;
 891         }
 892
 893         /**
 894          * Search for GNU diff3.
 895          * @return bool
 896          */
 897         protected function envCheckDiff3() {
 898                 $names = [ "gdiff3", "diff3" ];
 899                 if ( wfIsWindows() ) {
 900                         $names[] = 'diff3.exe';
 901                 }
 902                 $versionInfo = [ '--version', 'GNU diffutils' ];
 903
 904                 $diff3 = ExecutableFinder::findInDefaultPaths( $names, $versionInfo );
 905
 906                 if ( $diff3 ) {
 907                         $this->setVar( 'wgDiff3', $diff3 );
 908                 } else {
 909                         $this->setVar( 'wgDiff3', false );
 910                         $this->showMessage( 'config-diff3-bad' );
 911                 }
 912
 913                 return true;
 914         }
 915
 916         /**
 917          * Environment check for ImageMagick and GD.
 918          * @return bool
 919          */
 920         protected function envCheckGraphics() {
 921                 $names = wfIsWindows() ? 'convert.exe' : 'convert';
 922                 $versionInfo = [ '-version', 'ImageMagick' ];
 923                 $convert = ExecutableFinder::findInDefaultPaths( $names, $versionInfo );
 924
 925                 $this->setVar( 'wgImageMagickConvertCommand', '' );
 926                 if ( $convert ) {
 927                         $this->setVar( 'wgImageMagickConvertCommand', $convert );
 928                         $this->showMessage( 'config-imagemagick', $convert );
 929
 930                         return true;
 931                 } elseif ( function_exists( 'imagejpeg' ) ) {
 932                         $this->showMessage( 'config-gd' );
 933                 } else {
 934                         $this->showMessage( 'config-no-scaling' );
 935                 }
 936
 937                 return true;
 938         }
 939
 940         /**
 941          * Search for git.
 942          *
 943          * @since 1.22
 944          * @return bool
 945          */
 946         protected function envCheckGit() {
 947                 $names = wfIsWindows() ? 'git.exe' : 'git';
 948                 $versionInfo = [ '--version', 'git version' ];
 949
 950                 $git = ExecutableFinder::findInDefaultPaths( $names, $versionInfo );
 951
 952                 if ( $git ) {
 953                         $this->setVar( 'wgGitBin', $git );
 954                         $this->showMessage( 'config-git', $git );
 955                 } else {
 956                         $this->setVar( 'wgGitBin', false );
 957                         $this->showMessage( 'config-git-bad' );
 958                 }
 959
 960                 return true;
 961         }
 962
 963         /**
 964          * Environment check to inform user which server we've assumed.
 965          *
 966          * @return bool
 967          */
 968         protected function envCheckServer() {
 969                 $server = $this->envGetDefaultServer();
 970                 if ( $server !== null ) {
 971                         $this->showMessage( 'config-using-server', $server );
 972                 }
 973                 return true;
 974         }
 975
 976         /**
 977          * Environment check to inform user which paths we've assumed.
 978          *
 979          * @return bool
 980          */
 981         protected function envCheckPath() {
 982                 $this->showMessage(
 983                         'config-using-uri',
 984                         $this->getVar( 'wgServer' ),
 985                         $this->getVar( 'wgScriptPath' )
 986                 );
 987                 return true;
 988         }
 989
 990         /**
 991          * Environment check for preferred locale in shell
 992          * @return bool
 993          */
 994         protected function envCheckShellLocale() {
 995                 $os = php_uname( 's' );
 996                 $supported = [ 'Linux', 'SunOS', 'HP-UX', 'Darwin' ]; # Tested these
 997
 998                 if ( !in_array( $os, $supported ) ) {
 999                         return true;
1000                 }
1001
1002                 if ( Shell::isDisabled() ) {
1003                         return true;
1004                 }
1005
1006                 # Get a list of available locales.
1007                 $result = Shell::command( '/usr/bin/locale', '-a' )
1008                         ->execute();
1009
1010                 if ( $result->getExitCode() != 0 ) {
1011                         return true;
1012                 }
1013
1014                 $lines = $result->getStdout();
1015                 $lines = array_map( 'trim', explode( "\n", $lines ) );
1016                 $candidatesByLocale = [];
1017                 $candidatesByLang = [];
1018                 foreach ( $lines as $line ) {
1019                         if ( $line === '' ) {
1020                                 continue;
1021                         }
1022
1023                         if ( !preg_match( '/^([a-zA-Z]+)(_[a-zA-Z]+|)\.(utf8|UTF-8)(@[a-zA-Z_]*|)$/i', $line, $m ) ) {
1024                                 continue;
1025                         }
1026
1027                         list( , $lang, , , ) = $m;
1028
1029                         $candidatesByLocale[$m[0]] = $m;
1030                         $candidatesByLang[$lang][] = $m;
1031                 }
1032
1033                 # Try the current value of LANG.
1034                 if ( isset( $candidatesByLocale[getenv( 'LANG' )] ) ) {
1035                         $this->setVar( 'wgShellLocale', getenv( 'LANG' ) );
1036
1037                         return true;
1038                 }
1039
1040                 # Try the most common ones.
1041                 $commonLocales = [ 'C.UTF-8', 'en_US.UTF-8', 'en_US.utf8', 'de_DE.UTF-8', 'de_DE.utf8' ];
1042                 foreach ( $commonLocales as $commonLocale ) {
1043                         if ( isset( $candidatesByLocale[$commonLocale] ) ) {
1044                                 $this->setVar( 'wgShellLocale', $commonLocale );
1045
1046                                 return true;
1047                         }
1048                 }
1049
1050                 # Is there an available locale in the Wiki's language?
1051                 $wikiLang = $this->getVar( 'wgLanguageCode' );
1052
1053                 if ( isset( $candidatesByLang[$wikiLang] ) ) {
1054                         $m = reset( $candidatesByLang[$wikiLang] );
1055                         $this->setVar( 'wgShellLocale', $m[0] );
1056
1057                         return true;
1058                 }
1059
1060                 # Are there any at all?
1061                 if ( count( $candidatesByLocale ) ) {
1062                         $m = reset( $candidatesByLocale );
1063                         $this->setVar( 'wgShellLocale', $m[0] );
1064
1065                         return true;
1066                 }
1067
1068                 # Give up.
1069                 return true;
1070         }
1071
1072         /**
1073          * Environment check for the permissions of the uploads directory
1074          * @return bool
1075          */
1076         protected function envCheckUploadsDirectory() {
1077                 global $IP;
1078
1079                 $dir = $IP . '/images/';
1080                 $url = $this->getVar( 'wgServer' ) . $this->getVar( 'wgScriptPath' ) . '/images/';
1081                 $safe = !$this->dirIsExecutable( $dir, $url );
1082
1083                 if ( !$safe ) {
1084                         $this->showMessage( 'config-uploads-not-safe', $dir );
1085                 }
1086
1087                 return true;
1088         }
1089
1090         /**
1091          * Checks if suhosin.get.max_value_length is set, and if so generate
1092          * a warning because it decreases ResourceLoader performance.
1093          * @return bool
1094          */
1095         protected function envCheckSuhosinMaxValueLength() {
1096                 $maxValueLength = ini_get( 'suhosin.get.max_value_length' );
1097                 if ( $maxValueLength > 0 && $maxValueLength < 1024 ) {
1098                         // Only warn if the value is below the sane 1024
1099                         $this->showMessage( 'config-suhosin-max-value-length', $maxValueLength );
1100                 }
1101
1102                 return true;
1103         }
1104
1105         /**
1106          * Checks if we're running on 64 bit or not. 32 bit is becoming increasingly
1107          * hard to support, so let's at least warn people.
1108          *
1109          * @return bool
1110          */
1111         protected function envCheck64Bit() {
1112                 if ( PHP_INT_SIZE == 4 ) {
1113                         $this->showMessage( 'config-using-32bit' );
1114                 }
1115
1116                 return true;
1117         }
1118
1119         /**
1120          * Check the libicu version
1121          */
1122         protected function envCheckLibicu() {
1123                 /**
1124                  * This needs to be updated something that the latest libicu
1125                  * will properly normalize.  This normalization was found at
1126                  * https://www.unicode.org/versions/Unicode5.2.0/#Character_Additions
1127                  * Note that we use the hex representation to create the code
1128                  * points in order to avoid any Unicode-destroying during transit.
1129                  */
1130                 $not_normal_c = "\u{FA6C}";
1131                 $normal_c = "\u{242EE}";
1132
1133                 $useNormalizer = 'php';
1134                 $needsUpdate = false;
1135
1136                 if ( function_exists( 'normalizer_normalize' ) ) {
1137                         $useNormalizer = 'intl';
1138                         $intl = normalizer_normalize( $not_normal_c, Normalizer::FORM_C );
1139                         if ( $intl !== $normal_c ) {
1140                                 $needsUpdate = true;
1141                         }
1142                 }
1143
1144                 // Uses messages 'config-unicode-using-php' and 'config-unicode-using-intl'
1145                 if ( $useNormalizer === 'php' ) {
1146                         $this->showMessage( 'config-unicode-pure-php-warning' );
1147                 } else {
1148                         $this->showMessage( 'config-unicode-using-' . $useNormalizer );
1149                         if ( $needsUpdate ) {
1150                                 $this->showMessage( 'config-unicode-update-warning' );
1151                         }
1152                 }
1153         }
1154
1155         /**
1156          * Environment prep for the server hostname.
1157          */
1158         protected function envPrepServer() {
1159                 $server = $this->envGetDefaultServer();
1160                 if ( $server !== null ) {
1161                         $this->setVar( 'wgServer', $server );
1162                 }
1163         }
1164
1165         /**
1166          * Helper function to be called from envPrepServer()
1167          * @return string
1168          */
1169         abstract protected function envGetDefaultServer();
1170
1171         /**
1172          * Environment prep for setting $IP and $wgScriptPath.
1173          */
1174         protected function envPrepPath() {
1175                 global $IP;
1176                 $IP = dirname( dirname( __DIR__ ) );
1177                 $this->setVar( 'IP', $IP );
1178         }
1179
1180         /**
1181          * Checks if scripts located in the given directory can be executed via the given URL.
1182          *
1183          * Used only by environment checks.
1184          * @param string $dir
1185          * @param string $url
1186          * @return bool|int|string
1187          */
1188         public function dirIsExecutable( $dir, $url ) {
1189                 $scriptTypes = [
1190                         'php' => [
1191                                 "<?php echo 'ex' . 'ec';",
1192                                 "#!/var/env php\n<?php echo 'ex' . 'ec';",
1193                         ],
1194                 ];
1195
1196                 // it would be good to check other popular languages here, but it'll be slow.
1197
1198                 Wikimedia\suppressWarnings();
1199
1200                 foreach ( $scriptTypes as $ext => $contents ) {
1201                         foreach ( $contents as $source ) {
1202                                 $file = 'exectest.' . $ext;
1203
1204                                 if ( !file_put_contents( $dir . $file, $source ) ) {
1205                                         break;
1206                                 }
1207
1208                                 try {
1209                                         $text = Http::get( $url . $file, [ 'timeout' => 3 ], __METHOD__ );
1210                                 } catch ( Exception $e ) {
1211                                         // Http::get throws with allow_url_fopen = false and no curl extension.
1212                                         $text = null;
1213                                 }
1214                                 unlink( $dir . $file );
1215
1216                                 if ( $text == 'exec' ) {
1217                                         Wikimedia\restoreWarnings();
1218
1219                                         return $ext;
1220                                 }
1221                         }
1222                 }
1223
1224                 Wikimedia\restoreWarnings();
1225
1226                 return false;
1227         }
1228
1229         /**
1230          * Checks for presence of an Apache module. Works only if PHP is running as an Apache module, too.
1231          *
1232          * @param string $moduleName Name of module to check.
1233          * @return bool
1234          */
1235         public static function apacheModulePresent( $moduleName ) {
1236                 if ( function_exists( 'apache_get_modules' ) && in_array( $moduleName, apache_get_modules() ) ) {
1237                         return true;
1238                 }
1239                 // try it the hard way
1240                 ob_start();
1241                 phpinfo( INFO_MODULES );
1242                 $info = ob_get_clean();
1243
1244                 return strpos( $info, $moduleName ) !== false;
1245         }
1246
1247         /**
1248          * ParserOptions are constructed before we determined the language, so fix it
1249          *
1250          * @param Language $lang
1251          */
1252         public function setParserLanguage( $lang ) {
1253                 $this->parserOptions->setTargetLanguage( $lang );
1254                 $this->parserOptions->setUserLang( $lang );
1255         }
1256
1257         /**
1258          * Overridden by WebInstaller to provide lastPage parameters.
1259          * @param string $page
1260          * @return string
1261          */
1262         protected function getDocUrl( $page ) {
1263                 return "{$_SERVER['PHP_SELF']}?page=" . urlencode( $page );
1264         }
1265
1266         /**
1267          * Find extensions or skins in a subdirectory of $IP.
1268          * Returns an array containing the value for 'Name' for each found extension.
1269          *
1270          * @param string $directory Directory to search in, relative to $IP, must be either "extensions"
1271          *     or "skins"
1272          * @return array [ $extName => [ 'screenshots' => [ '...' ] ]
1273          */
1274         public function findExtensions( $directory = 'extensions' ) {
1275                 switch ( $directory ) {
1276                         case 'extensions':
1277                                 return $this->findExtensionsByType( 'extension', 'extensions' );
1278                         case 'skins':
1279                                 return $this->findExtensionsByType( 'skin', 'skins' );
1280                         default:
1281                                 throw new InvalidArgumentException( "Invalid extension type" );
1282                 }
1283         }
1284
1285         /**
1286          * Find extensions or skins, and return an array containing the value for 'Name' for each found
1287          * extension.
1288          *
1289          * @param string $type Either "extension" or "skin"
1290          * @param string $directory Directory to search in, relative to $IP
1291          * @return array [ $extName => [ 'screenshots' => [ '...' ] ]
1292          */
1293         protected function findExtensionsByType( $type = 'extension', $directory = 'extensions' ) {
1294                 if ( $this->getVar( 'IP' ) === null ) {
1295                         return [];
1296                 }
1297
1298                 $extDir = $this->getVar( 'IP' ) . '/' . $directory;
1299                 if ( !is_readable( $extDir ) || !is_dir( $extDir ) ) {
1300                         return [];
1301                 }
1302
1303                 $dh = opendir( $extDir );
1304                 $exts = [];
1305                 while ( ( $file = readdir( $dh ) ) !== false ) {
1306                         if ( !is_dir( "$extDir/$file" ) ) {
1307                                 continue;
1308                         }
1309                         $status = $this->getExtensionInfo( $type, $directory, $file );
1310                         if ( $status->isOK() ) {
1311                                 $exts[$file] = $status->value;
1312                         }
1313                 }
1314                 closedir( $dh );
1315                 uksort( $exts, 'strnatcasecmp' );
1316
1317                 return $exts;
1318         }
1319
1320         /**
1321          * @param string $type Either "extension" or "skin"
1322          * @param string $parentRelPath The parent directory relative to $IP
1323          * @param string $name The extension or skin name
1324          * @return Status An object containing an error list. If there were no errors, an associative
1325          *     array of information about the extension can be found in $status->value.
1326          */
1327         protected function getExtensionInfo( $type, $parentRelPath, $name ) {
1328                 if ( $this->getVar( 'IP' ) === null ) {
1329                         throw new Exception( 'Cannot find extensions since the IP variable is not yet set' );
1330                 }
1331                 if ( $type !== 'extension' && $type !== 'skin' ) {
1332                         throw new InvalidArgumentException( "Invalid extension type" );
1333                 }
1334                 $absDir = $this->getVar( 'IP' ) . "/$parentRelPath/$name";
1335                 $relDir = "../$parentRelPath/$name";
1336                 if ( !is_dir( $absDir ) ) {
1337                         return Status::newFatal( 'config-extension-not-found', $name );
1338                 }
1339                 $jsonFile = $type . '.json';
1340                 $fullJsonFile = "$absDir/$jsonFile";
1341                 $isJson = file_exists( $fullJsonFile );
1342                 $isPhp = false;
1343                 if ( !$isJson ) {
1344                         // Only fallback to PHP file if JSON doesn't exist
1345                         $fullPhpFile = "$absDir/$name.php";
1346                         $isPhp = file_exists( $fullPhpFile );
1347                 }
1348                 if ( !$isJson && !$isPhp ) {
1349                         return Status::newFatal( 'config-extension-not-found', $name );
1350                 }
1351
1352                 // Extension exists. Now see if there are screenshots
1353                 $info = [];
1354                 if ( is_dir( "$absDir/screenshots" ) ) {
1355                         $paths = glob( "$absDir/screenshots/*.png" );
1356                         foreach ( $paths as $path ) {
1357                                 $info['screenshots'][] = str_replace( $absDir, $relDir, $path );
1358                         }
1359                 }
1360
1361                 if ( $isJson ) {
1362                         $jsonStatus = $this->readExtension( $fullJsonFile );
1363                         if ( !$jsonStatus->isOK() ) {
1364                                 return $jsonStatus;
1365                         }
1366                         $info += $jsonStatus->value;
1367                 }
1368
1369                 return Status::newGood( $info );
1370         }
1371
1372         /**
1373          * @param string $fullJsonFile
1374          * @param array $extDeps
1375          * @param array $skinDeps
1376          *
1377          * @return Status On success, an array of extension information is in $status->value. On
1378          *    failure, the Status object will have an error list.
1379          */
1380         private function readExtension( $fullJsonFile, $extDeps = [], $skinDeps = [] ) {
1381                 $load = [
1382                         $fullJsonFile => 1
1383                 ];
1384                 if ( $extDeps ) {
1385                         $extDir = $this->getVar( 'IP' ) . '/extensions';
1386                         foreach ( $extDeps as $dep ) {
1387                                 $fname = "$extDir/$dep/extension.json";
1388                                 if ( !file_exists( $fname ) ) {
1389                                         return Status::newFatal( 'config-extension-not-found', $dep );
1390                                 }
1391                                 $load[$fname] = 1;
1392                         }
1393                 }
1394                 if ( $skinDeps ) {
1395                         $skinDir = $this->getVar( 'IP' ) . '/skins';
1396                         foreach ( $skinDeps as $dep ) {
1397                                 $fname = "$skinDir/$dep/skin.json";
1398                                 if ( !file_exists( $fname ) ) {
1399                                         return Status::newFatal( 'config-extension-not-found', $dep );
1400                                 }
1401                                 $load[$fname] = 1;
1402                         }
1403                 }
1404                 $registry = new ExtensionRegistry();
1405                 try {
1406                         $info = $registry->readFromQueue( $load );
1407                 } catch ( ExtensionDependencyError $e ) {
1408                         if ( $e->incompatibleCore || $e->incompatibleSkins
1409                                 || $e->incompatibleExtensions
1410                         ) {
1411                                 // If something is incompatible with a dependency, we have no real
1412                                 // option besides skipping it
1413                                 return Status::newFatal( 'config-extension-dependency',
1414                                         basename( dirname( $fullJsonFile ) ), $e->getMessage() );
1415                         } elseif ( $e->missingExtensions || $e->missingSkins ) {
1416                                 // There's an extension missing in the dependency tree,
1417                                 // so add those to the dependency list and try again
1418                                 return $this->readExtension(
1419                                         $fullJsonFile,
1420                                         array_merge( $extDeps, $e->missingExtensions ),
1421                                         array_merge( $skinDeps, $e->missingSkins )
1422                                 );
1423                         }
1424                         // Some other kind of dependency error?
1425                         return Status::newFatal( 'config-extension-dependency',
1426                                 basename( dirname( $fullJsonFile ) ), $e->getMessage() );
1427                 }
1428                 $ret = [];
1429                 // The order of credits will be the order of $load,
1430                 // so the first extension is the one we want to load,
1431                 // everything else is a dependency
1432                 $i = 0;
1433                 foreach ( $info['credits'] as $name => $credit ) {
1434                         $i++;
1435                         if ( $i == 1 ) {
1436                                 // Extension we want to load
1437                                 continue;
1438                         }
1439                         $type = basename( $credit['path'] ) === 'skin.json' ? 'skins' : 'extensions';
1440                         $ret['requires'][$type][] = $credit['name'];
1441                 }
1442                 $credits = array_values( $info['credits'] )[0];
1443                 if ( isset( $credits['url'] ) ) {
1444                         $ret['url'] = $credits['url'];
1445                 }
1446                 $ret['type'] = $credits['type'];
1447
1448                 return Status::newGood( $ret );
1449         }
1450
1451         /**
1452          * Returns a default value to be used for $wgDefaultSkin: normally the one set in DefaultSettings,
1453          * but will fall back to another if the default skin is missing and some other one is present
1454          * instead.
1455          *
1456          * @param string[] $skinNames Names of installed skins.
1457          * @return string
1458          */
1459         public function getDefaultSkin( array $skinNames ) {
1460                 $defaultSkin = $GLOBALS['wgDefaultSkin'];
1461                 if ( !$skinNames || in_array( $defaultSkin, $skinNames ) ) {
1462                         return $defaultSkin;
1463                 } else {
1464                         return $skinNames[0];
1465                 }
1466         }
1467
1468         /**
1469          * Installs the auto-detected extensions.
1470          *
1471          * @return Status
1472          */
1473         protected function includeExtensions() {
1474                 global $IP;
1475                 $exts = $this->getVar( '_Extensions' );
1476                 $IP = $this->getVar( 'IP' );
1477
1478                 // Marker for DatabaseUpdater::loadExtensions so we don't
1479                 // double load extensions
1480                 define( 'MW_EXTENSIONS_LOADED', true );
1481
1482                 /**
1483                  * We need to include DefaultSettings before including extensions to avoid
1484                  * warnings about unset variables. However, the only thing we really
1485                  * want here is $wgHooks['LoadExtensionSchemaUpdates']. This won't work
1486                  * if the extension has hidden hook registration in $wgExtensionFunctions,
1487                  * but we're not opening that can of worms
1488                  * @see https://phabricator.wikimedia.org/T28857
1489                  */
1490                 global $wgAutoloadClasses;
1491                 $wgAutoloadClasses = [];
1492                 $queue = [];
1493
1494                 require "$IP/includes/DefaultSettings.php";
1495
1496                 foreach ( $exts as $e ) {
1497                         if ( file_exists( "$IP/extensions/$e/extension.json" ) ) {
1498                                 $queue["$IP/extensions/$e/extension.json"] = 1;
1499                         } else {
1500                                 require_once "$IP/extensions/$e/$e.php";
1501                         }
1502                 }
1503
1504                 $registry = new ExtensionRegistry();
1505                 $data = $registry->readFromQueue( $queue );
1506                 $wgAutoloadClasses += $data['autoload'];
1507
1508                 $hooksWeWant = isset( $wgHooks['LoadExtensionSchemaUpdates'] ) ?
1509                         /** @suppress PhanUndeclaredVariable $wgHooks is set by DefaultSettings */
1510                         $wgHooks['LoadExtensionSchemaUpdates'] : [];
1511
1512                 if ( isset( $data['globals']['wgHooks']['LoadExtensionSchemaUpdates'] ) ) {
1513                         $hooksWeWant = array_merge_recursive(
1514                                 $hooksWeWant,
1515                                 $data['globals']['wgHooks']['LoadExtensionSchemaUpdates']
1516                         );
1517                 }
1518                 // Unset everyone else's hooks. Lord knows what someone might be doing
1519                 // in ParserFirstCallInit (see T29171)
1520                 $GLOBALS['wgHooks'] = [ 'LoadExtensionSchemaUpdates' => $hooksWeWant ];
1521
1522                 return Status::newGood();
1523         }
1524
1525         /**
1526          * Get an array of install steps. Should always be in the format of
1527          * [
1528          *   'name'     => 'someuniquename',
1529          *   'callback' => [ $obj, 'method' ],
1530          * ]
1531          * There must be a config-install-$name message defined per step, which will
1532          * be shown on install.
1533          *
1534          * @param DatabaseInstaller $installer DatabaseInstaller so we can make callbacks
1535          * @return array
1536          */
1537         protected function getInstallSteps( DatabaseInstaller $installer ) {
1538                 $coreInstallSteps = [
1539                         [ 'name' => 'database', 'callback' => [ $installer, 'setupDatabase' ] ],
1540                         [ 'name' => 'tables', 'callback' => [ $installer, 'createTables' ] ],
1541                         [ 'name' => 'interwiki', 'callback' => [ $installer, 'populateInterwikiTable' ] ],
1542                         [ 'name' => 'stats', 'callback' => [ $this, 'populateSiteStats' ] ],
1543                         [ 'name' => 'keys', 'callback' => [ $this, 'generateKeys' ] ],
1544                         [ 'name' => 'updates', 'callback' => [ $installer, 'insertUpdateKeys' ] ],
1545                         [ 'name' => 'sysop', 'callback' => [ $this, 'createSysop' ] ],
1546                         [ 'name' => 'mainpage', 'callback' => [ $this, 'createMainpage' ] ],
1547                 ];
1548
1549                 // Build the array of install steps starting from the core install list,
1550                 // then adding any callbacks that wanted to attach after a given step
1551                 foreach ( $coreInstallSteps as $step ) {
1552                         $this->installSteps[] = $step;
1553                         if ( isset( $this->extraInstallSteps[$step['name']] ) ) {
1554                                 $this->installSteps = array_merge(
1555                                         $this->installSteps,
1556                                         $this->extraInstallSteps[$step['name']]
1557                                 );
1558                         }
1559                 }
1560
1561                 // Prepend any steps that want to be at the beginning
1562                 if ( isset( $this->extraInstallSteps['BEGINNING'] ) ) {
1563                         $this->installSteps = array_merge(
1564                                 $this->extraInstallSteps['BEGINNING'],
1565                                 $this->installSteps
1566                         );
1567                 }
1568
1569                 // Extensions should always go first, chance to tie into hooks and such
1570                 if ( count( $this->getVar( '_Extensions' ) ) ) {
1571                         array_unshift( $this->installSteps,
1572                                 [ 'name' => 'extensions', 'callback' => [ $this, 'includeExtensions' ] ]
1573                         );
1574                         $this->installSteps[] = [
1575                                 'name' => 'extension-tables',
1576                                 'callback' => [ $installer, 'createExtensionTables' ]
1577                         ];
1578                 }
1579
1580                 return $this->installSteps;
1581         }
1582
1583         /**
1584          * Actually perform the installation.
1585          *
1586          * @param callable $startCB A callback array for the beginning of each step
1587          * @param callable $endCB A callback array for the end of each step
1588          *
1589          * @return array Array of Status objects
1590          */
1591         public function performInstallation( $startCB, $endCB ) {
1592                 $installResults = [];
1593                 $installer = $this->getDBInstaller();
1594                 $installer->preInstall();
1595                 $steps = $this->getInstallSteps( $installer );
1596                 foreach ( $steps as $stepObj ) {
1597                         $name = $stepObj['name'];
1598                         call_user_func_array( $startCB, [ $name ] );
1599
1600                         // Perform the callback step
1601                         $status = call_user_func( $stepObj['callback'], $installer );
1602
1603                         // Output and save the results
1604                         call_user_func( $endCB, $name, $status );
1605                         $installResults[$name] = $status;
1606
1607                         // If we've hit some sort of fatal, we need to bail.
1608                         // Callback already had a chance to do output above.
1609                         if ( !$status->isOk() ) {
1610                                 break;
1611                         }
1612                 }
1613                 if ( $status->isOk() ) {
1614                         $this->showMessage(
1615                                 'config-install-success',
1616                                 $this->getVar( 'wgServer' ),
1617                                 $this->getVar( 'wgScriptPath' )
1618                         );
1619                         $this->setVar( '_InstallDone', true );
1620                 }
1621
1622                 return $installResults;
1623         }
1624
1625         /**
1626          * Generate $wgSecretKey. Will warn if we had to use an insecure random source.
1627          *
1628          * @return Status
1629          */
1630         public function generateKeys() {
1631                 $keys = [ 'wgSecretKey' => 64 ];
1632                 if ( strval( $this->getVar( 'wgUpgradeKey' ) ) === '' ) {
1633                         $keys['wgUpgradeKey'] = 16;
1634                 }
1635
1636                 return $this->doGenerateKeys( $keys );
1637         }
1638
1639         /**
1640          * Generate a secret value for variables using our CryptRand generator.
1641          * Produce a warning if the random source was insecure.
1642          *
1643          * @param array $keys
1644          * @return Status
1645          */
1646         protected function doGenerateKeys( $keys ) {
1647                 $status = Status::newGood();
1648
1649                 foreach ( $keys as $name => $length ) {
1650                         $secretKey = MWCryptRand::generateHex( $length );
1651                         $this->setVar( $name, $secretKey );
1652                 }
1653
1654                 return $status;
1655         }
1656
1657         /**
1658          * Create the first user account, grant it sysop, bureaucrat and interface-admin rights
1659          *
1660          * @return Status
1661          */
1662         protected function createSysop() {
1663                 $name = $this->getVar( '_AdminName' );
1664                 $user = User::newFromName( $name );
1665
1666                 if ( !$user ) {
1667                         // We should've validated this earlier anyway!
1668                         return Status::newFatal( 'config-admin-error-user', $name );
1669                 }
1670
1671                 if ( $user->idForName() == 0 ) {
1672                         $user->addToDatabase();
1673
1674                         try {
1675                                 $user->setPassword( $this->getVar( '_AdminPassword' ) );
1676                         } catch ( PasswordError $pwe ) {
1677                                 return Status::newFatal( 'config-admin-error-password', $name, $pwe->getMessage() );
1678                         }
1679
1680                         $user->addGroup( 'sysop' );
1681                         $user->addGroup( 'bureaucrat' );
1682                         $user->addGroup( 'interface-admin' );
1683                         if ( $this->getVar( '_AdminEmail' ) ) {
1684                                 $user->setEmail( $this->getVar( '_AdminEmail' ) );
1685                         }
1686                         $user->saveSettings();
1687
1688                         // Update user count
1689                         $ssUpdate = SiteStatsUpdate::factory( [ 'users' => 1 ] );
1690                         $ssUpdate->doUpdate();
1691                 }
1692                 $status = Status::newGood();
1693
1694                 if ( $this->getVar( '_Subscribe' ) && $this->getVar( '_AdminEmail' ) ) {
1695                         $this->subscribeToMediaWikiAnnounce( $status );
1696                 }
1697
1698                 return $status;
1699         }
1700
1701         /**
1702          * @param Status $s
1703          */
1704         private function subscribeToMediaWikiAnnounce( Status $s ) {
1705                 $params = [
1706                         'email' => $this->getVar( '_AdminEmail' ),
1707                         'language' => 'en',
1708                         'digest' => 0
1709                 ];
1710
1711                 // Mailman doesn't support as many languages as we do, so check to make
1712                 // sure their selected language is available
1713                 $myLang = $this->getVar( '_UserLang' );
1714                 if ( in_array( $myLang, $this->mediaWikiAnnounceLanguages ) ) {
1715                         $myLang = $myLang == 'pt-br' ? 'pt_BR' : $myLang; // rewrite to Mailman's pt_BR
1716                         $params['language'] = $myLang;
1717                 }
1718
1719                 if ( MWHttpRequest::canMakeRequests() ) {
1720                         $res = MWHttpRequest::factory( $this->mediaWikiAnnounceUrl,
1721                                 [ 'method' => 'POST', 'postData' => $params ], __METHOD__ )->execute();
1722                         if ( !$res->isOK() ) {
1723                                 $s->warning( 'config-install-subscribe-fail', $res->getMessage() );
1724                         }
1725                 } else {
1726                         $s->warning( 'config-install-subscribe-notpossible' );
1727                 }
1728         }
1729
1730         /**
1731          * Insert Main Page with default content.
1732          *
1733          * @param DatabaseInstaller $installer
1734          * @return Status
1735          */
1736         protected function createMainpage( DatabaseInstaller $installer ) {
1737                 $status = Status::newGood();
1738                 $title = Title::newMainPage();
1739                 if ( $title->exists() ) {
1740                         $status->warning( 'config-install-mainpage-exists' );
1741                         return $status;
1742                 }
1743                 try {
1744                         $page = WikiPage::factory( $title );
1745                         $content = new WikitextContent(
1746                                 wfMessage( 'mainpagetext' )->inContentLanguage()->text() . "\n\n" .
1747                                 wfMessage( 'mainpagedocfooter' )->inContentLanguage()->text()
1748                         );
1749
1750                         $status = $page->doEditContent( $content,
1751                                 '',
1752                                 EDIT_NEW,
1753                                 false,
1754                                 User::newFromName( 'MediaWiki default' )
1755                         );
1756                 } catch ( Exception $e ) {
1757                         // using raw, because $wgShowExceptionDetails can not be set yet
1758                         $status->fatal( 'config-install-mainpage-failed', $e->getMessage() );
1759                 }
1760
1761                 return $status;
1762         }
1763
1764         /**
1765          * Override the necessary bits of the config to run an installation.
1766          */
1767         public static function overrideConfig() {
1768                 // Use PHP's built-in session handling, since MediaWiki's
1769                 // SessionHandler can't work before we have an object cache set up.
1770                 define( 'MW_NO_SESSION_HANDLER', 1 );
1771
1772                 // Don't access the database
1773                 $GLOBALS['wgUseDatabaseMessages'] = false;
1774                 // Don't cache langconv tables
1775                 $GLOBALS['wgLanguageConverterCacheType'] = CACHE_NONE;
1776                 // Debug-friendly
1777                 $GLOBALS['wgShowExceptionDetails'] = true;
1778                 $GLOBALS['wgShowHostnames'] = true;
1779                 // Don't break forms
1780                 $GLOBALS['wgExternalLinkTarget'] = '_blank';
1781
1782                 // Allow multiple ob_flush() calls
1783                 $GLOBALS['wgDisableOutputCompression'] = true;
1784
1785                 // Use a sensible cookie prefix (not my_wiki)
1786                 $GLOBALS['wgCookiePrefix'] = 'mw_installer';
1787
1788                 // Some of the environment checks make shell requests, remove limits
1789                 $GLOBALS['wgMaxShellMemory'] = 0;
1790
1791                 // Override the default CookieSessionProvider with a dummy
1792                 // implementation that won't stomp on PHP's cookies.
1793                 $GLOBALS['wgSessionProviders'] = [
1794                         [
1795                                 'class' => InstallerSessionProvider::class,
1796                                 'args' => [ [
1797                                         'priority' => 1,
1798                                 ] ]
1799                         ]
1800                 ];
1801
1802                 // Don't try to use any object cache for SessionManager either.
1803                 $GLOBALS['wgSessionCacheType'] = CACHE_NONE;
1804         }
1805
1806         /**
1807          * Add an installation step following the given step.
1808          *
1809          * @param callable $callback A valid installation callback array, in this form:
1810          *    [ 'name' => 'some-unique-name', 'callback' => [ $obj, 'function' ] ];
1811          * @param string $findStep The step to find. Omit to put the step at the beginning
1812          */
1813         public function addInstallStep( $callback, $findStep = 'BEGINNING' ) {
1814                 $this->extraInstallSteps[$findStep][] = $callback;
1815         }
1816
1817         /**
1818          * Disable the time limit for execution.
1819          * Some long-running pages (Install, Upgrade) will want to do this
1820          */
1821         protected function disableTimeLimit() {
1822                 Wikimedia\suppressWarnings();
1823                 set_time_limit( 0 );
1824                 Wikimedia\restoreWarnings();
1825         }
1826 }