includes/installer/Installer.php

   1 <?php
   2 /**
   3  * Base code for MediaWiki installer.
   4  *
   5  * DO NOT PATCH THIS FILE IF YOU NEED TO CHANGE INSTALLER BEHAVIOR IN YOUR PACKAGE!
   6  * See mw-config/overrides/README for details.
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License along
  19  * with this program; if not, write to the Free Software Foundation, Inc.,
  20  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  21  * http://www.gnu.org/copyleft/gpl.html
  22  *
  23  * @file
  24  * @ingroup Deployment
  25  */
  26 use MediaWiki\MediaWikiServices;
  27
  28 /**
  29  * This documentation group collects source code files with deployment functionality.
  30  *
  31  * @defgroup Deployment Deployment
  32  */
  33
  34 /**
  35  * Base installer class.
  36  *
  37  * This class provides the base for installation and update functionality
  38  * for both MediaWiki core and extensions.
  39  *
  40  * @ingroup Deployment
  41  * @since 1.17
  42  */
  43 abstract class Installer {
  44
  45         /**
  46          * The oldest version of PCRE we can support.
  47          *
  48          * Defining this is necessary because PHP may be linked with a system version
  49          * of PCRE, which may be older than that bundled with the minimum PHP version.
  50          */
  51         const MINIMUM_PCRE_VERSION = '7.2';
  52
  53         /**
  54          * @var array
  55          */
  56         protected $settings;
  57
  58         /**
  59          * List of detected DBs, access using getCompiledDBs().
  60          *
  61          * @var array
  62          */
  63         protected $compiledDBs;
  64
  65         /**
  66          * Cached DB installer instances, access using getDBInstaller().
  67          *
  68          * @var array
  69          */
  70         protected $dbInstallers = [];
  71
  72         /**
  73          * Minimum memory size in MB.
  74          *
  75          * @var int
  76          */
  77         protected $minMemorySize = 50;
  78
  79         /**
  80          * Cached Title, used by parse().
  81          *
  82          * @var Title
  83          */
  84         protected $parserTitle;
  85
  86         /**
  87          * Cached ParserOptions, used by parse().
  88          *
  89          * @var ParserOptions
  90          */
  91         protected $parserOptions;
  92
  93         /**
  94          * Known database types. These correspond to the class names <type>Installer,
  95          * and are also MediaWiki database types valid for $wgDBtype.
  96          *
  97          * To add a new type, create a <type>Installer class and a Database<type>
  98          * class, and add a config-type-<type> message to MessagesEn.php.
  99          *
 100          * @var array
 101          */
 102         protected static $dbTypes = [
 103                 'mysql',
 104                 'postgres',
 105                 'oracle',
 106                 'mssql',
 107                 'sqlite',
 108         ];
 109
 110         /**
 111          * A list of environment check methods called by doEnvironmentChecks().
 112          * These may output warnings using showMessage(), and/or abort the
 113          * installation process by returning false.
 114          *
 115          * For the WebInstaller these are only called on the Welcome page,
 116          * if these methods have side-effects that should affect later page loads
 117          * (as well as the generated stylesheet), use envPreps instead.
 118          *
 119          * @var array
 120          */
 121         protected $envChecks = [
 122                 'envCheckDB',
 123                 'envCheckBrokenXML',
 124                 'envCheckPCRE',
 125                 'envCheckMemory',
 126                 'envCheckCache',
 127                 'envCheckModSecurity',
 128                 'envCheckDiff3',
 129                 'envCheckGraphics',
 130                 'envCheckGit',
 131                 'envCheckServer',
 132                 'envCheckPath',
 133                 'envCheckShellLocale',
 134                 'envCheckUploadsDirectory',
 135                 'envCheckLibicu',
 136                 'envCheckSuhosinMaxValueLength',
 137                 'envCheck64Bit',
 138         ];
 139
 140         /**
 141          * A list of environment preparation methods called by doEnvironmentPreps().
 142          *
 143          * @var array
 144          */
 145         protected $envPreps = [
 146                 'envPrepServer',
 147                 'envPrepPath',
 148         ];
 149
 150         /**
 151          * MediaWiki configuration globals that will eventually be passed through
 152          * to LocalSettings.php. The names only are given here, the defaults
 153          * typically come from DefaultSettings.php.
 154          *
 155          * @var array
 156          */
 157         protected $defaultVarNames = [
 158                 'wgSitename',
 159                 'wgPasswordSender',
 160                 'wgLanguageCode',
 161                 'wgRightsIcon',
 162                 'wgRightsText',
 163                 'wgRightsUrl',
 164                 'wgEnableEmail',
 165                 'wgEnableUserEmail',
 166                 'wgEnotifUserTalk',
 167                 'wgEnotifWatchlist',
 168                 'wgEmailAuthentication',
 169                 'wgDBname',
 170                 'wgDBtype',
 171                 'wgDiff3',
 172                 'wgImageMagickConvertCommand',
 173                 'wgGitBin',
 174                 'IP',
 175                 'wgScriptPath',
 176                 'wgMetaNamespace',
 177                 'wgDeletedDirectory',
 178                 'wgEnableUploads',
 179                 'wgShellLocale',
 180                 'wgSecretKey',
 181                 'wgUseInstantCommons',
 182                 'wgUpgradeKey',
 183                 'wgDefaultSkin',
 184                 'wgPingback',
 185         ];
 186
 187         /**
 188          * Variables that are stored alongside globals, and are used for any
 189          * configuration of the installation process aside from the MediaWiki
 190          * configuration. Map of names to defaults.
 191          *
 192          * @var array
 193          */
 194         protected $internalDefaults = [
 195                 '_UserLang' => 'en',
 196                 '_Environment' => false,
 197                 '_RaiseMemory' => false,
 198                 '_UpgradeDone' => false,
 199                 '_InstallDone' => false,
 200                 '_Caches' => [],
 201                 '_InstallPassword' => '',
 202                 '_SameAccount' => true,
 203                 '_CreateDBAccount' => false,
 204                 '_NamespaceType' => 'site-name',
 205                 '_AdminName' => '', // will be set later, when the user selects language
 206                 '_AdminPassword' => '',
 207                 '_AdminPasswordConfirm' => '',
 208                 '_AdminEmail' => '',
 209                 '_Subscribe' => false,
 210                 '_SkipOptional' => 'continue',
 211                 '_RightsProfile' => 'wiki',
 212                 '_LicenseCode' => 'none',
 213                 '_CCDone' => false,
 214                 '_Extensions' => [],
 215                 '_Skins' => [],
 216                 '_MemCachedServers' => '',
 217                 '_UpgradeKeySupplied' => false,
 218                 '_ExistingDBSettings' => false,
 219
 220                 // $wgLogo is probably wrong (T50084); set something that will work.
 221                 // Single quotes work fine here, as LocalSettingsGenerator outputs this unescaped.
 222                 'wgLogo' => '$wgResourceBasePath/resources/assets/wiki.png',
 223                 'wgAuthenticationTokenVersion' => 1,
 224         ];
 225
 226         /**
 227          * The actual list of installation steps. This will be initialized by getInstallSteps()
 228          *
 229          * @var array
 230          */
 231         private $installSteps = [];
 232
 233         /**
 234          * Extra steps for installation, for things like DatabaseInstallers to modify
 235          *
 236          * @var array
 237          */
 238         protected $extraInstallSteps = [];
 239
 240         /**
 241          * Known object cache types and the functions used to test for their existence.
 242          *
 243          * @var array
 244          */
 245         protected $objectCaches = [
 246                 'xcache' => 'xcache_get',
 247                 'apc' => 'apc_fetch',
 248                 'apcu' => 'apcu_fetch',
 249                 'wincache' => 'wincache_ucache_get'
 250         ];
 251
 252         /**
 253          * User rights profiles.
 254          *
 255          * @var array
 256          */
 257         public $rightsProfiles = [
 258                 'wiki' => [],
 259                 'no-anon' => [
 260                         '*' => [ 'edit' => false ]
 261                 ],
 262                 'fishbowl' => [
 263                         '*' => [
 264                                 'createaccount' => false,
 265                                 'edit' => false,
 266                         ],
 267                 ],
 268                 'private' => [
 269                         '*' => [
 270                                 'createaccount' => false,
 271                                 'edit' => false,
 272                                 'read' => false,
 273                         ],
 274                 ],
 275         ];
 276
 277         /**
 278          * License types.
 279          *
 280          * @var array
 281          */
 282         public $licenses = [
 283                 'cc-by' => [
 284                         'url' => 'https://creativecommons.org/licenses/by/4.0/',
 285                         'icon' => '$wgResourceBasePath/resources/assets/licenses/cc-by.png',
 286                 ],
 287                 'cc-by-sa' => [
 288                         'url' => 'https://creativecommons.org/licenses/by-sa/4.0/',
 289                         'icon' => '$wgResourceBasePath/resources/assets/licenses/cc-by-sa.png',
 290                 ],
 291                 'cc-by-nc-sa' => [
 292                         'url' => 'https://creativecommons.org/licenses/by-nc-sa/4.0/',
 293                         'icon' => '$wgResourceBasePath/resources/assets/licenses/cc-by-nc-sa.png',
 294                 ],
 295                 'cc-0' => [
 296                         'url' => 'https://creativecommons.org/publicdomain/zero/1.0/',
 297                         'icon' => '$wgResourceBasePath/resources/assets/licenses/cc-0.png',
 298                 ],
 299                 'gfdl' => [
 300                         'url' => 'https://www.gnu.org/copyleft/fdl.html',
 301                         'icon' => '$wgResourceBasePath/resources/assets/licenses/gnu-fdl.png',
 302                 ],
 303                 'none' => [
 304                         'url' => '',
 305                         'icon' => '',
 306                         'text' => ''
 307                 ],
 308                 'cc-choose' => [
 309                         // Details will be filled in by the selector.
 310                         'url' => '',
 311                         'icon' => '',
 312                         'text' => '',
 313                 ],
 314         ];
 315
 316         /**
 317          * URL to mediawiki-announce subscription
 318          */
 319         protected $mediaWikiAnnounceUrl =
 320                 'https://lists.wikimedia.org/mailman/subscribe/mediawiki-announce';
 321
 322         /**
 323          * Supported language codes for Mailman
 324          */
 325         protected $mediaWikiAnnounceLanguages = [
 326                 'ca', 'cs', 'da', 'de', 'en', 'es', 'et', 'eu', 'fi', 'fr', 'hr', 'hu',
 327                 'it', 'ja', 'ko', 'lt', 'nl', 'no', 'pl', 'pt', 'pt-br', 'ro', 'ru',
 328                 'sl', 'sr', 'sv', 'tr', 'uk'
 329         ];
 330
 331         /**
 332          * UI interface for displaying a short message
 333          * The parameters are like parameters to wfMessage().
 334          * The messages will be in wikitext format, which will be converted to an
 335          * output format such as HTML or text before being sent to the user.
 336          * @param string $msg
 337          */
 338         abstract public function showMessage( $msg /*, ... */ );
 339
 340         /**
 341          * Same as showMessage(), but for displaying errors
 342          * @param string $msg
 343          */
 344         abstract public function showError( $msg /*, ... */ );
 345
 346         /**
 347          * Show a message to the installing user by using a Status object
 348          * @param Status $status
 349          */
 350         abstract public function showStatusMessage( Status $status );
 351
 352         /**
 353          * Constructs a Config object that contains configuration settings that should be
 354          * overwritten for the installation process.
 355          *
 356          * @since 1.27
 357          *
 358          * @param Config $baseConfig
 359          *
 360          * @return Config The config to use during installation.
 361          */
 362         public static function getInstallerConfig( Config $baseConfig ) {
 363                 $configOverrides = new HashConfig();
 364
 365                 // disable (problematic) object cache types explicitly, preserving all other (working) ones
 366                 // bug T113843
 367                 $emptyCache = [ 'class' => 'EmptyBagOStuff' ];
 368
 369                 $objectCaches = [
 370                                 CACHE_NONE => $emptyCache,
 371                                 CACHE_DB => $emptyCache,
 372                                 CACHE_ANYTHING => $emptyCache,
 373                                 CACHE_MEMCACHED => $emptyCache,
 374                         ] + $baseConfig->get( 'ObjectCaches' );
 375
 376                 $configOverrides->set( 'ObjectCaches', $objectCaches );
 377
 378                 // Load the installer's i18n.
 379                 $messageDirs = $baseConfig->get( 'MessagesDirs' );
 380                 $messageDirs['MediawikiInstaller'] = __DIR__ . '/i18n';
 381
 382                 $configOverrides->set( 'MessagesDirs', $messageDirs );
 383
 384                 $installerConfig = new MultiConfig( [ $configOverrides, $baseConfig ] );
 385
 386                 // make sure we use the installer config as the main config
 387                 $configRegistry = $baseConfig->get( 'ConfigRegistry' );
 388                 $configRegistry['main'] = function () use ( $installerConfig ) {
 389                         return $installerConfig;
 390                 };
 391
 392                 $configOverrides->set( 'ConfigRegistry', $configRegistry );
 393
 394                 return $installerConfig;
 395         }
 396
 397         /**
 398          * Constructor, always call this from child classes.
 399          */
 400         public function __construct() {
 401                 global $wgMemc, $wgUser, $wgObjectCaches;
 402
 403                 $defaultConfig = new GlobalVarConfig(); // all the stuff from DefaultSettings.php
 404                 $installerConfig = self::getInstallerConfig( $defaultConfig );
 405
 406                 // Reset all services and inject config overrides
 407                 MediaWiki\MediaWikiServices::resetGlobalInstance( $installerConfig );
 408
 409                 // Don't attempt to load user language options (T126177)
 410                 // This will be overridden in the web installer with the user-specified language
 411                 RequestContext::getMain()->setLanguage( 'en' );
 412
 413                 // Disable the i18n cache
 414                 // TODO: manage LocalisationCache singleton in MediaWikiServices
 415                 Language::getLocalisationCache()->disableBackend();
 416
 417                 // Disable all global services, since we don't have any configuration yet!
 418                 MediaWiki\MediaWikiServices::disableStorageBackend();
 419
 420                 // Disable object cache (otherwise CACHE_ANYTHING will try CACHE_DB and
 421                 // SqlBagOStuff will then throw since we just disabled wfGetDB)
 422                 $wgObjectCaches = MediaWikiServices::getInstance()->getMainConfig()->get( 'ObjectCaches' );
 423                 $wgMemc = ObjectCache::getInstance( CACHE_NONE );
 424
 425                 // Having a user with id = 0 safeguards us from DB access via User::loadOptions().
 426                 $wgUser = User::newFromId( 0 );
 427                 RequestContext::getMain()->setUser( $wgUser );
 428
 429                 $this->settings = $this->internalDefaults;
 430
 431                 foreach ( $this->defaultVarNames as $var ) {
 432                         $this->settings[$var] = $GLOBALS[$var];
 433                 }
 434
 435                 $this->doEnvironmentPreps();
 436
 437                 $this->compiledDBs = [];
 438                 foreach ( self::getDBTypes() as $type ) {
 439                         $installer = $this->getDBInstaller( $type );
 440
 441                         if ( !$installer->isCompiled() ) {
 442                                 continue;
 443                         }
 444                         $this->compiledDBs[] = $type;
 445                 }
 446
 447                 $this->parserTitle = Title::newFromText( 'Installer' );
 448                 $this->parserOptions = new ParserOptions( $wgUser ); // language will be wrong :(
 449                 $this->parserOptions->setEditSection( false );
 450                 $this->parserOptions->setWrapOutputClass( false );
 451                 // Don't try to access DB before user language is initialised
 452                 $this->setParserLanguage( Language::factory( 'en' ) );
 453         }
 454
 455         /**
 456          * Get a list of known DB types.
 457          *
 458          * @return array
 459          */
 460         public static function getDBTypes() {
 461                 return self::$dbTypes;
 462         }
 463
 464         /**
 465          * Do initial checks of the PHP environment. Set variables according to
 466          * the observed environment.
 467          *
 468          * It's possible that this may be called under the CLI SAPI, not the SAPI
 469          * that the wiki will primarily run under. In that case, the subclass should
 470          * initialise variables such as wgScriptPath, before calling this function.
 471          *
 472          * Under the web subclass, it can already be assumed that PHP 5+ is in use
 473          * and that sessions are working.
 474          *
 475          * @return Status
 476          */
 477         public function doEnvironmentChecks() {
 478                 // Php version has already been checked by entry scripts
 479                 // Show message here for information purposes
 480                 if ( wfIsHHVM() ) {
 481                         $this->showMessage( 'config-env-hhvm', HHVM_VERSION );
 482                 } else {
 483                         $this->showMessage( 'config-env-php', PHP_VERSION );
 484                 }
 485
 486                 $good = true;
 487                 // Must go here because an old version of PCRE can prevent other checks from completing
 488                 list( $pcreVersion ) = explode( ' ', PCRE_VERSION, 2 );
 489                 if ( version_compare( $pcreVersion, self::MINIMUM_PCRE_VERSION, '<' ) ) {
 490                         $this->showError( 'config-pcre-old', self::MINIMUM_PCRE_VERSION, $pcreVersion );
 491                         $good = false;
 492                 } else {
 493                         foreach ( $this->envChecks as $check ) {
 494                                 $status = $this->$check();
 495                                 if ( $status === false ) {
 496                                         $good = false;
 497                                 }
 498                         }
 499                 }
 500
 501                 $this->setVar( '_Environment', $good );
 502
 503                 return $good ? Status::newGood() : Status::newFatal( 'config-env-bad' );
 504         }
 505
 506         public function doEnvironmentPreps() {
 507                 foreach ( $this->envPreps as $prep ) {
 508                         $this->$prep();
 509                 }
 510         }
 511
 512         /**
 513          * Set a MW configuration variable, or internal installer configuration variable.
 514          *
 515          * @param string $name
 516          * @param mixed $value
 517          */
 518         public function setVar( $name, $value ) {
 519                 $this->settings[$name] = $value;
 520         }
 521
 522         /**
 523          * Get an MW configuration variable, or internal installer configuration variable.
 524          * The defaults come from $GLOBALS (ultimately DefaultSettings.php).
 525          * Installer variables are typically prefixed by an underscore.
 526          *
 527          * @param string $name
 528          * @param mixed $default
 529          *
 530          * @return mixed
 531          */
 532         public function getVar( $name, $default = null ) {
 533                 if ( !isset( $this->settings[$name] ) ) {
 534                         return $default;
 535                 } else {
 536                         return $this->settings[$name];
 537                 }
 538         }
 539
 540         /**
 541          * Get a list of DBs supported by current PHP setup
 542          *
 543          * @return array
 544          */
 545         public function getCompiledDBs() {
 546                 return $this->compiledDBs;
 547         }
 548
 549         /**
 550          * Get the DatabaseInstaller class name for this type
 551          *
 552          * @param string $type database type ($wgDBtype)
 553          * @return string Class name
 554          * @since 1.30
 555          */
 556         public static function getDBInstallerClass( $type ) {
 557                 return ucfirst( $type ) . 'Installer';
 558         }
 559
 560         /**
 561          * Get an instance of DatabaseInstaller for the specified DB type.
 562          *
 563          * @param mixed $type DB installer for which is needed, false to use default.
 564          *
 565          * @return DatabaseInstaller
 566          */
 567         public function getDBInstaller( $type = false ) {
 568                 if ( !$type ) {
 569                         $type = $this->getVar( 'wgDBtype' );
 570                 }
 571
 572                 $type = strtolower( $type );
 573
 574                 if ( !isset( $this->dbInstallers[$type] ) ) {
 575                         $class = self::getDBInstallerClass( $type );
 576                         $this->dbInstallers[$type] = new $class( $this );
 577                 }
 578
 579                 return $this->dbInstallers[$type];
 580         }
 581
 582         /**
 583          * Determine if LocalSettings.php exists. If it does, return its variables.
 584          *
 585          * @return array|false
 586          */
 587         public static function getExistingLocalSettings() {
 588                 global $IP;
 589
 590                 // You might be wondering why this is here. Well if you don't do this
 591                 // then some poorly-formed extensions try to call their own classes
 592                 // after immediately registering them. We really need to get extension
 593                 // registration out of the global scope and into a real format.
 594                 // @see https://phabricator.wikimedia.org/T69440
 595                 global $wgAutoloadClasses;
 596                 $wgAutoloadClasses = [];
 597
 598                 // @codingStandardsIgnoreStart
 599                 // LocalSettings.php should not call functions, except wfLoadSkin/wfLoadExtensions
 600                 // Define the required globals here, to ensure, the functions can do it work correctly.
 601                 global $wgExtensionDirectory, $wgStyleDirectory;
 602                 // @codingStandardsIgnoreEnd
 603
 604                 MediaWiki\suppressWarnings();
 605                 $_lsExists = file_exists( "$IP/LocalSettings.php" );
 606                 MediaWiki\restoreWarnings();
 607
 608                 if ( !$_lsExists ) {
 609                         return false;
 610                 }
 611                 unset( $_lsExists );
 612
 613                 require "$IP/includes/DefaultSettings.php";
 614                 require "$IP/LocalSettings.php";
 615
 616                 return get_defined_vars();
 617         }
 618
 619         /**
 620          * Get a fake password for sending back to the user in HTML.
 621          * This is a security mechanism to avoid compromise of the password in the
 622          * event of session ID compromise.
 623          *
 624          * @param string $realPassword
 625          *
 626          * @return string
 627          */
 628         public function getFakePassword( $realPassword ) {
 629                 return str_repeat( '*', strlen( $realPassword ) );
 630         }
 631
 632         /**
 633          * Set a variable which stores a password, except if the new value is a
 634          * fake password in which case leave it as it is.
 635          *
 636          * @param string $name
 637          * @param mixed $value
 638          */
 639         public function setPassword( $name, $value ) {
 640                 if ( !preg_match( '/^\*+$/', $value ) ) {
 641                         $this->setVar( $name, $value );
 642                 }
 643         }
 644
 645         /**
 646          * On POSIX systems return the primary group of the webserver we're running under.
 647          * On other systems just returns null.
 648          *
 649          * This is used to advice the user that he should chgrp his mw-config/data/images directory as the
 650          * webserver user before he can install.
 651          *
 652          * Public because SqliteInstaller needs it, and doesn't subclass Installer.
 653          *
 654          * @return mixed
 655          */
 656         public static function maybeGetWebserverPrimaryGroup() {
 657                 if ( !function_exists( 'posix_getegid' ) || !function_exists( 'posix_getpwuid' ) ) {
 658                         # I don't know this, this isn't UNIX.
 659                         return null;
 660                 }
 661
 662                 # posix_getegid() *not* getmygid() because we want the group of the webserver,
 663                 # not whoever owns the current script.
 664                 $gid = posix_getegid();
 665                 $group = posix_getpwuid( $gid )['name'];
 666
 667                 return $group;
 668         }
 669
 670         /**
 671          * Convert wikitext $text to HTML.
 672          *
 673          * This is potentially error prone since many parser features require a complete
 674          * installed MW database. The solution is to just not use those features when you
 675          * write your messages. This appears to work well enough. Basic formatting and
 676          * external links work just fine.
 677          *
 678          * But in case a translator decides to throw in a "#ifexist" or internal link or
 679          * whatever, this function is guarded to catch the attempted DB access and to present
 680          * some fallback text.
 681          *
 682          * @param string $text
 683          * @param bool $lineStart
 684          * @return string
 685          */
 686         public function parse( $text, $lineStart = false ) {
 687                 global $wgParser;
 688
 689                 try {
 690                         $out = $wgParser->parse( $text, $this->parserTitle, $this->parserOptions, $lineStart );
 691                         $html = $out->getText();
 692                 } catch ( MediaWiki\Services\ServiceDisabledException $e ) {
 693                         $html = '<!--DB access attempted during parse-->  ' . htmlspecialchars( $text );
 694
 695                         if ( !empty( $this->debug ) ) {
 696                                 $html .= "<!--\n" . $e->getTraceAsString() . "\n-->";
 697                         }
 698                 }
 699
 700                 return $html;
 701         }
 702
 703         /**
 704          * @return ParserOptions
 705          */
 706         public function getParserOptions() {
 707                 return $this->parserOptions;
 708         }
 709
 710         public function disableLinkPopups() {
 711                 $this->parserOptions->setExternalLinkTarget( false );
 712         }
 713
 714         public function restoreLinkPopups() {
 715                 global $wgExternalLinkTarget;
 716                 $this->parserOptions->setExternalLinkTarget( $wgExternalLinkTarget );
 717         }
 718
 719         /**
 720          * Install step which adds a row to the site_stats table with appropriate
 721          * initial values.
 722          *
 723          * @param DatabaseInstaller $installer
 724          *
 725          * @return Status
 726          */
 727         public function populateSiteStats( DatabaseInstaller $installer ) {
 728                 $status = $installer->getConnection();
 729                 if ( !$status->isOK() ) {
 730                         return $status;
 731                 }
 732                 $status->value->insert(
 733                         'site_stats',
 734                         [
 735                                 'ss_row_id' => 1,
 736                                 'ss_total_edits' => 0,
 737                                 'ss_good_articles' => 0,
 738                                 'ss_total_pages' => 0,
 739                                 'ss_users' => 0,
 740                                 'ss_active_users' => 0,
 741                                 'ss_images' => 0
 742                         ],
 743                         __METHOD__, 'IGNORE'
 744                 );
 745
 746                 return Status::newGood();
 747         }
 748
 749         /**
 750          * Environment check for DB types.
 751          * @return bool
 752          */
 753         protected function envCheckDB() {
 754                 global $wgLang;
 755
 756                 $allNames = [];
 757
 758                 // Messages: config-type-mysql, config-type-postgres, config-type-oracle,
 759                 // config-type-sqlite
 760                 foreach ( self::getDBTypes() as $name ) {
 761                         $allNames[] = wfMessage( "config-type-$name" )->text();
 762                 }
 763
 764                 $databases = $this->getCompiledDBs();
 765
 766                 $databases = array_flip( $databases );
 767                 foreach ( array_keys( $databases ) as $db ) {
 768                         $installer = $this->getDBInstaller( $db );
 769                         $status = $installer->checkPrerequisites();
 770                         if ( !$status->isGood() ) {
 771                                 $this->showStatusMessage( $status );
 772                         }
 773                         if ( !$status->isOK() ) {
 774                                 unset( $databases[$db] );
 775                         }
 776                 }
 777                 $databases = array_flip( $databases );
 778                 if ( !$databases ) {
 779                         $this->showError( 'config-no-db', $wgLang->commaList( $allNames ), count( $allNames ) );
 780
 781                         // @todo FIXME: This only works for the web installer!
 782                         return false;
 783                 }
 784
 785                 return true;
 786         }
 787
 788         /**
 789          * Some versions of libxml+PHP break < and > encoding horribly
 790          * @return bool
 791          */
 792         protected function envCheckBrokenXML() {
 793                 $test = new PhpXmlBugTester();
 794                 if ( !$test->ok ) {
 795                         $this->showError( 'config-brokenlibxml' );
 796
 797                         return false;
 798                 }
 799
 800                 return true;
 801         }
 802
 803         /**
 804          * Environment check for the PCRE module.
 805          *
 806          * @note If this check were to fail, the parser would
 807          *   probably throw an exception before the result
 808          *   of this check is shown to the user.
 809          * @return bool
 810          */
 811         protected function envCheckPCRE() {
 812                 MediaWiki\suppressWarnings();
 813                 $regexd = preg_replace( '/[\x{0430}-\x{04FF}]/iu', '', '-АБВГД-' );
 814                 // Need to check for \p support too, as PCRE can be compiled
 815                 // with utf8 support, but not unicode property support.
 816                 // check that \p{Zs} (space separators) matches
 817                 // U+3000 (Ideographic space)
 818                 $regexprop = preg_replace( '/\p{Zs}/u', '', "-\xE3\x80\x80-" );
 819                 MediaWiki\restoreWarnings();
 820                 if ( $regexd != '--' || $regexprop != '--' ) {
 821                         $this->showError( 'config-pcre-no-utf8' );
 822
 823                         return false;
 824                 }
 825
 826                 return true;
 827         }
 828
 829         /**
 830          * Environment check for available memory.
 831          * @return bool
 832          */
 833         protected function envCheckMemory() {
 834                 $limit = ini_get( 'memory_limit' );
 835
 836                 if ( !$limit || $limit == -1 ) {
 837                         return true;
 838                 }
 839
 840                 $n = wfShorthandToInteger( $limit );
 841
 842                 if ( $n < $this->minMemorySize * 1024 * 1024 ) {
 843                         $newLimit = "{$this->minMemorySize}M";
 844
 845                         if ( ini_set( "memory_limit", $newLimit ) === false ) {
 846                                 $this->showMessage( 'config-memory-bad', $limit );
 847                         } else {
 848                                 $this->showMessage( 'config-memory-raised', $limit, $newLimit );
 849                                 $this->setVar( '_RaiseMemory', true );
 850                         }
 851                 }
 852
 853                 return true;
 854         }
 855
 856         /**
 857          * Environment check for compiled object cache types.
 858          */
 859         protected function envCheckCache() {
 860                 $caches = [];
 861                 foreach ( $this->objectCaches as $name => $function ) {
 862                         if ( function_exists( $function ) ) {
 863                                 if ( $name == 'xcache' && !wfIniGetBool( 'xcache.var_size' ) ) {
 864                                         continue;
 865                                 }
 866                                 $caches[$name] = true;
 867                         }
 868                 }
 869
 870                 if ( !$caches ) {
 871                         $key = 'config-no-cache-apcu';
 872                         $this->showMessage( $key );
 873                 }
 874
 875                 $this->setVar( '_Caches', $caches );
 876         }
 877
 878         /**
 879          * Scare user to death if they have mod_security or mod_security2
 880          * @return bool
 881          */
 882         protected function envCheckModSecurity() {
 883                 if ( self::apacheModulePresent( 'mod_security' )
 884                         || self::apacheModulePresent( 'mod_security2' ) ) {
 885                         $this->showMessage( 'config-mod-security' );
 886                 }
 887
 888                 return true;
 889         }
 890
 891         /**
 892          * Search for GNU diff3.
 893          * @return bool
 894          */
 895         protected function envCheckDiff3() {
 896                 $names = [ "gdiff3", "diff3", "diff3.exe" ];
 897                 $versionInfo = [ '$1 --version 2>&1', 'GNU diffutils' ];
 898
 899                 $diff3 = self::locateExecutableInDefaultPaths( $names, $versionInfo );
 900
 901                 if ( $diff3 ) {
 902                         $this->setVar( 'wgDiff3', $diff3 );
 903                 } else {
 904                         $this->setVar( 'wgDiff3', false );
 905                         $this->showMessage( 'config-diff3-bad' );
 906                 }
 907
 908                 return true;
 909         }
 910
 911         /**
 912          * Environment check for ImageMagick and GD.
 913          * @return bool
 914          */
 915         protected function envCheckGraphics() {
 916                 $names = [ wfIsWindows() ? 'convert.exe' : 'convert' ];
 917                 $versionInfo = [ '$1 -version', 'ImageMagick' ];
 918                 $convert = self::locateExecutableInDefaultPaths( $names, $versionInfo );
 919
 920                 $this->setVar( 'wgImageMagickConvertCommand', '' );
 921                 if ( $convert ) {
 922                         $this->setVar( 'wgImageMagickConvertCommand', $convert );
 923                         $this->showMessage( 'config-imagemagick', $convert );
 924
 925                         return true;
 926                 } elseif ( function_exists( 'imagejpeg' ) ) {
 927                         $this->showMessage( 'config-gd' );
 928                 } else {
 929                         $this->showMessage( 'config-no-scaling' );
 930                 }
 931
 932                 return true;
 933         }
 934
 935         /**
 936          * Search for git.
 937          *
 938          * @since 1.22
 939          * @return bool
 940          */
 941         protected function envCheckGit() {
 942                 $names = [ wfIsWindows() ? 'git.exe' : 'git' ];
 943                 $versionInfo = [ '$1 --version', 'git version' ];
 944
 945                 $git = self::locateExecutableInDefaultPaths( $names, $versionInfo );
 946
 947                 if ( $git ) {
 948                         $this->setVar( 'wgGitBin', $git );
 949                         $this->showMessage( 'config-git', $git );
 950                 } else {
 951                         $this->setVar( 'wgGitBin', false );
 952                         $this->showMessage( 'config-git-bad' );
 953                 }
 954
 955                 return true;
 956         }
 957
 958         /**
 959          * Environment check to inform user which server we've assumed.
 960          *
 961          * @return bool
 962          */
 963         protected function envCheckServer() {
 964                 $server = $this->envGetDefaultServer();
 965                 if ( $server !== null ) {
 966                         $this->showMessage( 'config-using-server', $server );
 967                 }
 968                 return true;
 969         }
 970
 971         /**
 972          * Environment check to inform user which paths we've assumed.
 973          *
 974          * @return bool
 975          */
 976         protected function envCheckPath() {
 977                 $this->showMessage(
 978                         'config-using-uri',
 979                         $this->getVar( 'wgServer' ),
 980                         $this->getVar( 'wgScriptPath' )
 981                 );
 982                 return true;
 983         }
 984
 985         /**
 986          * Environment check for preferred locale in shell
 987          * @return bool
 988          */
 989         protected function envCheckShellLocale() {
 990                 $os = php_uname( 's' );
 991                 $supported = [ 'Linux', 'SunOS', 'HP-UX', 'Darwin' ]; # Tested these
 992
 993                 if ( !in_array( $os, $supported ) ) {
 994                         return true;
 995                 }
 996
 997                 # Get a list of available locales.
 998                 $ret = false;
 999                 $lines = wfShellExec( '/usr/bin/locale -a', $ret );
1000
1001                 if ( $ret ) {
1002                         return true;
1003                 }
1004
1005                 $lines = array_map( 'trim', explode( "\n", $lines ) );
1006                 $candidatesByLocale = [];
1007                 $candidatesByLang = [];
1008
1009                 foreach ( $lines as $line ) {
1010                         if ( $line === '' ) {
1011                                 continue;
1012                         }
1013
1014                         if ( !preg_match( '/^([a-zA-Z]+)(_[a-zA-Z]+|)\.(utf8|UTF-8)(@[a-zA-Z_]*|)$/i', $line, $m ) ) {
1015                                 continue;
1016                         }
1017
1018                         list( , $lang, , , ) = $m;
1019
1020                         $candidatesByLocale[$m[0]] = $m;
1021                         $candidatesByLang[$lang][] = $m;
1022                 }
1023
1024                 # Try the current value of LANG.
1025                 if ( isset( $candidatesByLocale[getenv( 'LANG' )] ) ) {
1026                         $this->setVar( 'wgShellLocale', getenv( 'LANG' ) );
1027
1028                         return true;
1029                 }
1030
1031                 # Try the most common ones.
1032                 $commonLocales = [ 'C.UTF-8', 'en_US.UTF-8', 'en_US.utf8', 'de_DE.UTF-8', 'de_DE.utf8' ];
1033                 foreach ( $commonLocales as $commonLocale ) {
1034                         if ( isset( $candidatesByLocale[$commonLocale] ) ) {
1035                                 $this->setVar( 'wgShellLocale', $commonLocale );
1036
1037                                 return true;
1038                         }
1039                 }
1040
1041                 # Is there an available locale in the Wiki's language?
1042                 $wikiLang = $this->getVar( 'wgLanguageCode' );
1043
1044                 if ( isset( $candidatesByLang[$wikiLang] ) ) {
1045                         $m = reset( $candidatesByLang[$wikiLang] );
1046                         $this->setVar( 'wgShellLocale', $m[0] );
1047
1048                         return true;
1049                 }
1050
1051                 # Are there any at all?
1052                 if ( count( $candidatesByLocale ) ) {
1053                         $m = reset( $candidatesByLocale );
1054                         $this->setVar( 'wgShellLocale', $m[0] );
1055
1056                         return true;
1057                 }
1058
1059                 # Give up.
1060                 return true;
1061         }
1062
1063         /**
1064          * Environment check for the permissions of the uploads directory
1065          * @return bool
1066          */
1067         protected function envCheckUploadsDirectory() {
1068                 global $IP;
1069
1070                 $dir = $IP . '/images/';
1071                 $url = $this->getVar( 'wgServer' ) . $this->getVar( 'wgScriptPath' ) . '/images/';
1072                 $safe = !$this->dirIsExecutable( $dir, $url );
1073
1074                 if ( !$safe ) {
1075                         $this->showMessage( 'config-uploads-not-safe', $dir );
1076                 }
1077
1078                 return true;
1079         }
1080
1081         /**
1082          * Checks if suhosin.get.max_value_length is set, and if so generate
1083          * a warning because it decreases ResourceLoader performance.
1084          * @return bool
1085          */
1086         protected function envCheckSuhosinMaxValueLength() {
1087                 $maxValueLength = ini_get( 'suhosin.get.max_value_length' );
1088                 if ( $maxValueLength > 0 && $maxValueLength < 1024 ) {
1089                         // Only warn if the value is below the sane 1024
1090                         $this->showMessage( 'config-suhosin-max-value-length', $maxValueLength );
1091                 }
1092
1093                 return true;
1094         }
1095
1096         /**
1097          * Checks if we're running on 64 bit or not. 32 bit is becoming increasingly
1098          * hard to support, so let's at least warn people.
1099          *
1100          * @return bool
1101          */
1102         protected function envCheck64Bit() {
1103                 if ( PHP_INT_SIZE == 4 ) {
1104                         $this->showMessage( 'config-using-32bit' );
1105                 }
1106
1107                 return true;
1108         }
1109
1110         /**
1111          * Convert a hex string representing a Unicode code point to that code point.
1112          * @param string $c
1113          * @return string|false
1114          */
1115         protected function unicodeChar( $c ) {
1116                 $c = hexdec( $c );
1117                 if ( $c <= 0x7F ) {
1118                         return chr( $c );
1119                 } elseif ( $c <= 0x7FF ) {
1120                         return chr( 0xC0 | $c >> 6 ) . chr( 0x80 | $c & 0x3F );
1121                 } elseif ( $c <= 0xFFFF ) {
1122                         return chr( 0xE0 | $c >> 12 ) . chr( 0x80 | $c >> 6 & 0x3F ) .
1123                                 chr( 0x80 | $c & 0x3F );
1124                 } elseif ( $c <= 0x10FFFF ) {
1125                         return chr( 0xF0 | $c >> 18 ) . chr( 0x80 | $c >> 12 & 0x3F ) .
1126                                 chr( 0x80 | $c >> 6 & 0x3F ) .
1127                                 chr( 0x80 | $c & 0x3F );
1128                 } else {
1129                         return false;
1130                 }
1131         }
1132
1133         /**
1134          * Check the libicu version
1135          */
1136         protected function envCheckLibicu() {
1137                 /**
1138                  * This needs to be updated something that the latest libicu
1139                  * will properly normalize.  This normalization was found at
1140                  * http://www.unicode.org/versions/Unicode5.2.0/#Character_Additions
1141                  * Note that we use the hex representation to create the code
1142                  * points in order to avoid any Unicode-destroying during transit.
1143                  */
1144                 $not_normal_c = $this->unicodeChar( "FA6C" );
1145                 $normal_c = $this->unicodeChar( "242EE" );
1146
1147                 $useNormalizer = 'php';
1148                 $needsUpdate = false;
1149
1150                 if ( function_exists( 'normalizer_normalize' ) ) {
1151                         $useNormalizer = 'intl';
1152                         $intl = normalizer_normalize( $not_normal_c, Normalizer::FORM_C );
1153                         if ( $intl !== $normal_c ) {
1154                                 $needsUpdate = true;
1155                         }
1156                 }
1157
1158                 // Uses messages 'config-unicode-using-php' and 'config-unicode-using-intl'
1159                 if ( $useNormalizer === 'php' ) {
1160                         $this->showMessage( 'config-unicode-pure-php-warning' );
1161                 } else {
1162                         $this->showMessage( 'config-unicode-using-' . $useNormalizer );
1163                         if ( $needsUpdate ) {
1164                                 $this->showMessage( 'config-unicode-update-warning' );
1165                         }
1166                 }
1167         }
1168
1169         /**
1170          * Environment prep for the server hostname.
1171          */
1172         protected function envPrepServer() {
1173                 $server = $this->envGetDefaultServer();
1174                 if ( $server !== null ) {
1175                         $this->setVar( 'wgServer', $server );
1176                 }
1177         }
1178
1179         /**
1180          * Helper function to be called from envPrepServer()
1181          * @return string
1182          */
1183         abstract protected function envGetDefaultServer();
1184
1185         /**
1186          * Environment prep for setting $IP and $wgScriptPath.
1187          */
1188         protected function envPrepPath() {
1189                 global $IP;
1190                 $IP = dirname( dirname( __DIR__ ) );
1191                 $this->setVar( 'IP', $IP );
1192         }
1193
1194         /**
1195          * Get an array of likely places we can find executables. Check a bunch
1196          * of known Unix-like defaults, as well as the PATH environment variable
1197          * (which should maybe make it work for Windows?)
1198          *
1199          * @return array
1200          */
1201         protected static function getPossibleBinPaths() {
1202                 return array_merge(
1203                         [ '/usr/bin', '/usr/local/bin', '/opt/csw/bin',
1204                                 '/usr/gnu/bin', '/usr/sfw/bin', '/sw/bin', '/opt/local/bin' ],
1205                         explode( PATH_SEPARATOR, getenv( 'PATH' ) )
1206                 );
1207         }
1208
1209         /**
1210          * Search a path for any of the given executable names. Returns the
1211          * executable name if found. Also checks the version string returned
1212          * by each executable.
1213          *
1214          * Used only by environment checks.
1215          *
1216          * @param string $path Path to search
1217          * @param array $names Array of executable names
1218          * @param array|bool $versionInfo False or array with two members:
1219          *   0 => Command to run for version check, with $1 for the full executable name
1220          *   1 => String to compare the output with
1221          *
1222          * If $versionInfo is not false, only executables with a version
1223          * matching $versionInfo[1] will be returned.
1224          * @return bool|string
1225          */
1226         public static function locateExecutable( $path, $names, $versionInfo = false ) {
1227                 if ( !is_array( $names ) ) {
1228                         $names = [ $names ];
1229                 }
1230
1231                 foreach ( $names as $name ) {
1232                         $command = $path . DIRECTORY_SEPARATOR . $name;
1233
1234                         MediaWiki\suppressWarnings();
1235                         $file_exists = is_executable( $command );
1236                         MediaWiki\restoreWarnings();
1237
1238                         if ( $file_exists ) {
1239                                 if ( !$versionInfo ) {
1240                                         return $command;
1241                                 }
1242
1243                                 $file = str_replace( '$1', wfEscapeShellArg( $command ), $versionInfo[0] );
1244                                 if ( strstr( wfShellExec( $file ), $versionInfo[1] ) !== false ) {
1245                                         return $command;
1246                                 }
1247                         }
1248                 }
1249
1250                 return false;
1251         }
1252
1253         /**
1254          * Same as locateExecutable(), but checks in getPossibleBinPaths() by default
1255          * @see locateExecutable()
1256          * @param array $names Array of possible names.
1257          * @param array|bool $versionInfo Default: false or array with two members:
1258          *   0 => Command to run for version check, with $1 for the full executable name
1259          *   1 => String to compare the output with
1260          *
1261          * If $versionInfo is not false, only executables with a version
1262          * matching $versionInfo[1] will be returned.
1263          * @return bool|string
1264          */
1265         public static function locateExecutableInDefaultPaths( $names, $versionInfo = false ) {
1266                 foreach ( self::getPossibleBinPaths() as $path ) {
1267                         $exe = self::locateExecutable( $path, $names, $versionInfo );
1268                         if ( $exe !== false ) {
1269                                 return $exe;
1270                         }
1271                 }
1272
1273                 return false;
1274         }
1275
1276         /**
1277          * Checks if scripts located in the given directory can be executed via the given URL.
1278          *
1279          * Used only by environment checks.
1280          * @param string $dir
1281          * @param string $url
1282          * @return bool|int|string
1283          */
1284         public function dirIsExecutable( $dir, $url ) {
1285                 $scriptTypes = [
1286                         'php' => [
1287                                 "<?php echo 'ex' . 'ec';",
1288                                 "#!/var/env php5\n<?php echo 'ex' . 'ec';",
1289                         ],
1290                 ];
1291
1292                 // it would be good to check other popular languages here, but it'll be slow.
1293
1294                 MediaWiki\suppressWarnings();
1295
1296                 foreach ( $scriptTypes as $ext => $contents ) {
1297                         foreach ( $contents as $source ) {
1298                                 $file = 'exectest.' . $ext;
1299
1300                                 if ( !file_put_contents( $dir . $file, $source ) ) {
1301                                         break;
1302                                 }
1303
1304                                 try {
1305                                         $text = Http::get( $url . $file, [ 'timeout' => 3 ], __METHOD__ );
1306                                 } catch ( Exception $e ) {
1307                                         // Http::get throws with allow_url_fopen = false and no curl extension.
1308                                         $text = null;
1309                                 }
1310                                 unlink( $dir . $file );
1311
1312                                 if ( $text == 'exec' ) {
1313                                         MediaWiki\restoreWarnings();
1314
1315                                         return $ext;
1316                                 }
1317                         }
1318                 }
1319
1320                 MediaWiki\restoreWarnings();
1321
1322                 return false;
1323         }
1324
1325         /**
1326          * Checks for presence of an Apache module. Works only if PHP is running as an Apache module, too.
1327          *
1328          * @param string $moduleName Name of module to check.
1329          * @return bool
1330          */
1331         public static function apacheModulePresent( $moduleName ) {
1332                 if ( function_exists( 'apache_get_modules' ) && in_array( $moduleName, apache_get_modules() ) ) {
1333                         return true;
1334                 }
1335                 // try it the hard way
1336                 ob_start();
1337                 phpinfo( INFO_MODULES );
1338                 $info = ob_get_clean();
1339
1340                 return strpos( $info, $moduleName ) !== false;
1341         }
1342
1343         /**
1344          * ParserOptions are constructed before we determined the language, so fix it
1345          *
1346          * @param Language $lang
1347          */
1348         public function setParserLanguage( $lang ) {
1349                 $this->parserOptions->setTargetLanguage( $lang );
1350                 $this->parserOptions->setUserLang( $lang );
1351         }
1352
1353         /**
1354          * Overridden by WebInstaller to provide lastPage parameters.
1355          * @param string $page
1356          * @return string
1357          */
1358         protected function getDocUrl( $page ) {
1359                 return "{$_SERVER['PHP_SELF']}?page=" . urlencode( $page );
1360         }
1361
1362         /**
1363          * Finds extensions that follow the format /$directory/Name/Name.php,
1364          * and returns an array containing the value for 'Name' for each found extension.
1365          *
1366          * Reasonable values for $directory include 'extensions' (the default) and 'skins'.
1367          *
1368          * @param string $directory Directory to search in
1369          * @return array [ $extName => [ 'screenshots' => [ '...' ] ]
1370          */
1371         public function findExtensions( $directory = 'extensions' ) {
1372                 if ( $this->getVar( 'IP' ) === null ) {
1373                         return [];
1374                 }
1375
1376                 $extDir = $this->getVar( 'IP' ) . '/' . $directory;
1377                 if ( !is_readable( $extDir ) || !is_dir( $extDir ) ) {
1378                         return [];
1379                 }
1380
1381                 // extensions -> extension.json, skins -> skin.json
1382                 $jsonFile = substr( $directory, 0, strlen( $directory ) - 1 ) . '.json';
1383
1384                 $dh = opendir( $extDir );
1385                 $exts = [];
1386                 while ( ( $file = readdir( $dh ) ) !== false ) {
1387                         if ( !is_dir( "$extDir/$file" ) ) {
1388                                 continue;
1389                         }
1390                         if ( file_exists( "$extDir/$file/$jsonFile" ) || file_exists( "$extDir/$file/$file.php" ) ) {
1391                                 // Extension exists. Now see if there are screenshots
1392                                 $exts[$file] = [];
1393                                 if ( is_dir( "$extDir/$file/screenshots" ) ) {
1394                                         $paths = glob( "$extDir/$file/screenshots/*.png" );
1395                                         foreach ( $paths as $path ) {
1396                                                 $exts[$file]['screenshots'][] = str_replace( $extDir, "../$directory", $path );
1397                                         }
1398
1399                                 }
1400                         }
1401                 }
1402                 closedir( $dh );
1403                 uksort( $exts, 'strnatcasecmp' );
1404
1405                 return $exts;
1406         }
1407
1408         /**
1409          * Returns a default value to be used for $wgDefaultSkin: normally the one set in DefaultSettings,
1410          * but will fall back to another if the default skin is missing and some other one is present
1411          * instead.
1412          *
1413          * @param string[] $skinNames Names of installed skins.
1414          * @return string
1415          */
1416         public function getDefaultSkin( array $skinNames ) {
1417                 $defaultSkin = $GLOBALS['wgDefaultSkin'];
1418                 if ( !$skinNames || in_array( $defaultSkin, $skinNames ) ) {
1419                         return $defaultSkin;
1420                 } else {
1421                         return $skinNames[0];
1422                 }
1423         }
1424
1425         /**
1426          * Installs the auto-detected extensions.
1427          *
1428          * @return Status
1429          */
1430         protected function includeExtensions() {
1431                 global $IP;
1432                 $exts = $this->getVar( '_Extensions' );
1433                 $IP = $this->getVar( 'IP' );
1434
1435                 /**
1436                  * We need to include DefaultSettings before including extensions to avoid
1437                  * warnings about unset variables. However, the only thing we really
1438                  * want here is $wgHooks['LoadExtensionSchemaUpdates']. This won't work
1439                  * if the extension has hidden hook registration in $wgExtensionFunctions,
1440                  * but we're not opening that can of worms
1441                  * @see https://phabricator.wikimedia.org/T28857
1442                  */
1443                 global $wgAutoloadClasses;
1444                 $wgAutoloadClasses = [];
1445                 $queue = [];
1446
1447                 require "$IP/includes/DefaultSettings.php";
1448
1449                 foreach ( $exts as $e ) {
1450                         if ( file_exists( "$IP/extensions/$e/extension.json" ) ) {
1451                                 $queue["$IP/extensions/$e/extension.json"] = 1;
1452                         } else {
1453                                 require_once "$IP/extensions/$e/$e.php";
1454                         }
1455                 }
1456
1457                 $registry = new ExtensionRegistry();
1458                 $data = $registry->readFromQueue( $queue );
1459                 $wgAutoloadClasses += $data['autoload'];
1460
1461                 $hooksWeWant = isset( $wgHooks['LoadExtensionSchemaUpdates'] ) ?
1462                         /** @suppress PhanUndeclaredVariable $wgHooks is set by DefaultSettings */
1463                         $wgHooks['LoadExtensionSchemaUpdates'] : [];
1464
1465                 if ( isset( $data['globals']['wgHooks']['LoadExtensionSchemaUpdates'] ) ) {
1466                         $hooksWeWant = array_merge_recursive(
1467                                 $hooksWeWant,
1468                                 $data['globals']['wgHooks']['LoadExtensionSchemaUpdates']
1469                         );
1470                 }
1471                 // Unset everyone else's hooks. Lord knows what someone might be doing
1472                 // in ParserFirstCallInit (see T29171)
1473                 $GLOBALS['wgHooks'] = [ 'LoadExtensionSchemaUpdates' => $hooksWeWant ];
1474
1475                 return Status::newGood();
1476         }
1477
1478         /**
1479          * Get an array of install steps. Should always be in the format of
1480          * [
1481          *   'name'     => 'someuniquename',
1482          *   'callback' => [ $obj, 'method' ],
1483          * ]
1484          * There must be a config-install-$name message defined per step, which will
1485          * be shown on install.
1486          *
1487          * @param DatabaseInstaller $installer DatabaseInstaller so we can make callbacks
1488          * @return array
1489          */
1490         protected function getInstallSteps( DatabaseInstaller $installer ) {
1491                 $coreInstallSteps = [
1492                         [ 'name' => 'database', 'callback' => [ $installer, 'setupDatabase' ] ],
1493                         [ 'name' => 'tables', 'callback' => [ $installer, 'createTables' ] ],
1494                         [ 'name' => 'interwiki', 'callback' => [ $installer, 'populateInterwikiTable' ] ],
1495                         [ 'name' => 'stats', 'callback' => [ $this, 'populateSiteStats' ] ],
1496                         [ 'name' => 'keys', 'callback' => [ $this, 'generateKeys' ] ],
1497                         [ 'name' => 'updates', 'callback' => [ $installer, 'insertUpdateKeys' ] ],
1498                         [ 'name' => 'sysop', 'callback' => [ $this, 'createSysop' ] ],
1499                         [ 'name' => 'mainpage', 'callback' => [ $this, 'createMainpage' ] ],
1500                 ];
1501
1502                 // Build the array of install steps starting from the core install list,
1503                 // then adding any callbacks that wanted to attach after a given step
1504                 foreach ( $coreInstallSteps as $step ) {
1505                         $this->installSteps[] = $step;
1506                         if ( isset( $this->extraInstallSteps[$step['name']] ) ) {
1507                                 $this->installSteps = array_merge(
1508                                         $this->installSteps,
1509                                         $this->extraInstallSteps[$step['name']]
1510                                 );
1511                         }
1512                 }
1513
1514                 // Prepend any steps that want to be at the beginning
1515                 if ( isset( $this->extraInstallSteps['BEGINNING'] ) ) {
1516                         $this->installSteps = array_merge(
1517                                 $this->extraInstallSteps['BEGINNING'],
1518                                 $this->installSteps
1519                         );
1520                 }
1521
1522                 // Extensions should always go first, chance to tie into hooks and such
1523                 if ( count( $this->getVar( '_Extensions' ) ) ) {
1524                         array_unshift( $this->installSteps,
1525                                 [ 'name' => 'extensions', 'callback' => [ $this, 'includeExtensions' ] ]
1526                         );
1527                         $this->installSteps[] = [
1528                                 'name' => 'extension-tables',
1529                                 'callback' => [ $installer, 'createExtensionTables' ]
1530                         ];
1531                 }
1532
1533                 return $this->installSteps;
1534         }
1535
1536         /**
1537          * Actually perform the installation.
1538          *
1539          * @param callable $startCB A callback array for the beginning of each step
1540          * @param callable $endCB A callback array for the end of each step
1541          *
1542          * @return array Array of Status objects
1543          */
1544         public function performInstallation( $startCB, $endCB ) {
1545                 $installResults = [];
1546                 $installer = $this->getDBInstaller();
1547                 $installer->preInstall();
1548                 $steps = $this->getInstallSteps( $installer );
1549                 foreach ( $steps as $stepObj ) {
1550                         $name = $stepObj['name'];
1551                         call_user_func_array( $startCB, [ $name ] );
1552
1553                         // Perform the callback step
1554                         $status = call_user_func( $stepObj['callback'], $installer );
1555
1556                         // Output and save the results
1557                         call_user_func( $endCB, $name, $status );
1558                         $installResults[$name] = $status;
1559
1560                         // If we've hit some sort of fatal, we need to bail.
1561                         // Callback already had a chance to do output above.
1562                         if ( !$status->isOk() ) {
1563                                 break;
1564                         }
1565                 }
1566                 if ( $status->isOk() ) {
1567                         $this->setVar( '_InstallDone', true );
1568                 }
1569
1570                 return $installResults;
1571         }
1572
1573         /**
1574          * Generate $wgSecretKey. Will warn if we had to use an insecure random source.
1575          *
1576          * @return Status
1577          */
1578         public function generateKeys() {
1579                 $keys = [ 'wgSecretKey' => 64 ];
1580                 if ( strval( $this->getVar( 'wgUpgradeKey' ) ) === '' ) {
1581                         $keys['wgUpgradeKey'] = 16;
1582                 }
1583
1584                 return $this->doGenerateKeys( $keys );
1585         }
1586
1587         /**
1588          * Generate a secret value for variables using our CryptRand generator.
1589          * Produce a warning if the random source was insecure.
1590          *
1591          * @param array $keys
1592          * @return Status
1593          */
1594         protected function doGenerateKeys( $keys ) {
1595                 $status = Status::newGood();
1596
1597                 $strong = true;
1598                 foreach ( $keys as $name => $length ) {
1599                         $secretKey = MWCryptRand::generateHex( $length, true );
1600                         if ( !MWCryptRand::wasStrong() ) {
1601                                 $strong = false;
1602                         }
1603
1604                         $this->setVar( $name, $secretKey );
1605                 }
1606
1607                 if ( !$strong ) {
1608                         $names = array_keys( $keys );
1609                         $names = preg_replace( '/^(.*)$/', '\$$1', $names );
1610                         global $wgLang;
1611                         $status->warning( 'config-insecure-keys', $wgLang->listToText( $names ), count( $names ) );
1612                 }
1613
1614                 return $status;
1615         }
1616
1617         /**
1618          * Create the first user account, grant it sysop and bureaucrat rights
1619          *
1620          * @return Status
1621          */
1622         protected function createSysop() {
1623                 $name = $this->getVar( '_AdminName' );
1624                 $user = User::newFromName( $name );
1625
1626                 if ( !$user ) {
1627                         // We should've validated this earlier anyway!
1628                         return Status::newFatal( 'config-admin-error-user', $name );
1629                 }
1630
1631                 if ( $user->idForName() == 0 ) {
1632                         $user->addToDatabase();
1633
1634                         try {
1635                                 $user->setPassword( $this->getVar( '_AdminPassword' ) );
1636                         } catch ( PasswordError $pwe ) {
1637                                 return Status::newFatal( 'config-admin-error-password', $name, $pwe->getMessage() );
1638                         }
1639
1640                         $user->addGroup( 'sysop' );
1641                         $user->addGroup( 'bureaucrat' );
1642                         if ( $this->getVar( '_AdminEmail' ) ) {
1643                                 $user->setEmail( $this->getVar( '_AdminEmail' ) );
1644                         }
1645                         $user->saveSettings();
1646
1647                         // Update user count
1648                         $ssUpdate = new SiteStatsUpdate( 0, 0, 0, 0, 1 );
1649                         $ssUpdate->doUpdate();
1650                 }
1651                 $status = Status::newGood();
1652
1653                 if ( $this->getVar( '_Subscribe' ) && $this->getVar( '_AdminEmail' ) ) {
1654                         $this->subscribeToMediaWikiAnnounce( $status );
1655                 }
1656
1657                 return $status;
1658         }
1659
1660         /**
1661          * @param Status $s
1662          */
1663         private function subscribeToMediaWikiAnnounce( Status $s ) {
1664                 $params = [
1665                         'email' => $this->getVar( '_AdminEmail' ),
1666                         'language' => 'en',
1667                         'digest' => 0
1668                 ];
1669
1670                 // Mailman doesn't support as many languages as we do, so check to make
1671                 // sure their selected language is available
1672                 $myLang = $this->getVar( '_UserLang' );
1673                 if ( in_array( $myLang, $this->mediaWikiAnnounceLanguages ) ) {
1674                         $myLang = $myLang == 'pt-br' ? 'pt_BR' : $myLang; // rewrite to Mailman's pt_BR
1675                         $params['language'] = $myLang;
1676                 }
1677
1678                 if ( MWHttpRequest::canMakeRequests() ) {
1679                         $res = MWHttpRequest::factory( $this->mediaWikiAnnounceUrl,
1680                                 [ 'method' => 'POST', 'postData' => $params ], __METHOD__ )->execute();
1681                         if ( !$res->isOK() ) {
1682                                 $s->warning( 'config-install-subscribe-fail', $res->getMessage() );
1683                         }
1684                 } else {
1685                         $s->warning( 'config-install-subscribe-notpossible' );
1686                 }
1687         }
1688
1689         /**
1690          * Insert Main Page with default content.
1691          *
1692          * @param DatabaseInstaller $installer
1693          * @return Status
1694          */
1695         protected function createMainpage( DatabaseInstaller $installer ) {
1696                 $status = Status::newGood();
1697                 $title = Title::newMainPage();
1698                 if ( $title->exists() ) {
1699                         $status->warning( 'config-install-mainpage-exists' );
1700                         return $status;
1701                 }
1702                 try {
1703                         $page = WikiPage::factory( $title );
1704                         $content = new WikitextContent(
1705                                 wfMessage( 'mainpagetext' )->inContentLanguage()->text() . "\n\n" .
1706                                 wfMessage( 'mainpagedocfooter' )->inContentLanguage()->text()
1707                         );
1708
1709                         $status = $page->doEditContent( $content,
1710                                 '',
1711                                 EDIT_NEW,
1712                                 false,
1713                                 User::newFromName( 'MediaWiki default' )
1714                         );
1715                 } catch ( Exception $e ) {
1716                         // using raw, because $wgShowExceptionDetails can not be set yet
1717                         $status->fatal( 'config-install-mainpage-failed', $e->getMessage() );
1718                 }
1719
1720                 return $status;
1721         }
1722
1723         /**
1724          * Override the necessary bits of the config to run an installation.
1725          */
1726         public static function overrideConfig() {
1727                 // Use PHP's built-in session handling, since MediaWiki's
1728                 // SessionHandler can't work before we have an object cache set up.
1729                 define( 'MW_NO_SESSION_HANDLER', 1 );
1730
1731                 // Don't access the database
1732                 $GLOBALS['wgUseDatabaseMessages'] = false;
1733                 // Don't cache langconv tables
1734                 $GLOBALS['wgLanguageConverterCacheType'] = CACHE_NONE;
1735                 // Debug-friendly
1736                 $GLOBALS['wgShowExceptionDetails'] = true;
1737                 // Don't break forms
1738                 $GLOBALS['wgExternalLinkTarget'] = '_blank';
1739
1740                 // Extended debugging
1741                 $GLOBALS['wgShowSQLErrors'] = true;
1742                 $GLOBALS['wgShowDBErrorBacktrace'] = true;
1743
1744                 // Allow multiple ob_flush() calls
1745                 $GLOBALS['wgDisableOutputCompression'] = true;
1746
1747                 // Use a sensible cookie prefix (not my_wiki)
1748                 $GLOBALS['wgCookiePrefix'] = 'mw_installer';
1749
1750                 // Some of the environment checks make shell requests, remove limits
1751                 $GLOBALS['wgMaxShellMemory'] = 0;
1752
1753                 // Override the default CookieSessionProvider with a dummy
1754                 // implementation that won't stomp on PHP's cookies.
1755                 $GLOBALS['wgSessionProviders'] = [
1756                         [
1757                                 'class' => 'InstallerSessionProvider',
1758                                 'args' => [ [
1759                                         'priority' => 1,
1760                                 ] ]
1761                         ]
1762                 ];
1763
1764                 // Don't try to use any object cache for SessionManager either.
1765                 $GLOBALS['wgSessionCacheType'] = CACHE_NONE;
1766         }
1767
1768         /**
1769          * Add an installation step following the given step.
1770          *
1771          * @param callable $callback A valid installation callback array, in this form:
1772          *    [ 'name' => 'some-unique-name', 'callback' => [ $obj, 'function' ] ];
1773          * @param string $findStep The step to find. Omit to put the step at the beginning
1774          */
1775         public function addInstallStep( $callback, $findStep = 'BEGINNING' ) {
1776                 $this->extraInstallSteps[$findStep][] = $callback;
1777         }
1778
1779         /**
1780          * Disable the time limit for execution.
1781          * Some long-running pages (Install, Upgrade) will want to do this
1782          */
1783         protected function disableTimeLimit() {
1784                 MediaWiki\suppressWarnings();
1785                 set_time_limit( 0 );
1786                 MediaWiki\restoreWarnings();
1787         }
1788 }