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