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                 // $wgLogo is probably wrong (bug 48084); set something that will work.
 220                 // Single quotes work fine here, as LocalSettingsGenerator outputs this unescaped.
 221                 'wgLogo' => '$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                 'wincache' => 'wincache_ucache_get'
 248         ];
 249
 250         /**
 251          * User rights profiles.
 252          *
 253          * @var array
 254          */
 255         public $rightsProfiles = [
 256                 'wiki' => [],
 257                 'no-anon' => [
 258                         '*' => [ 'edit' => false ]
 259                 ],
 260                 'fishbowl' => [
 261                         '*' => [
 262                                 'createaccount' => false,
 263                                 'edit' => false,
 264                         ],
 265                 ],
 266                 'private' => [
 267                         '*' => [
 268                                 'createaccount' => false,
 269                                 'edit' => false,
 270                                 'read' => false,
 271                         ],
 272                 ],
 273         ];
 274
 275         /**
 276          * License types.
 277          *
 278          * @var array
 279          */
 280         public $licenses = [
 281                 'cc-by' => [
 282                         'url' => 'https://creativecommons.org/licenses/by/4.0/',
 283                         'icon' => '$wgResourceBasePath/resources/assets/licenses/cc-by.png',
 284                 ],
 285                 'cc-by-sa' => [
 286                         'url' => 'https://creativecommons.org/licenses/by-sa/4.0/',
 287                         'icon' => '$wgResourceBasePath/resources/assets/licenses/cc-by-sa.png',
 288                 ],
 289                 'cc-by-nc-sa' => [
 290                         'url' => 'https://creativecommons.org/licenses/by-nc-sa/4.0/',
 291                         'icon' => '$wgResourceBasePath/resources/assets/licenses/cc-by-nc-sa.png',
 292                 ],
 293                 'cc-0' => [
 294                         'url' => 'https://creativecommons.org/publicdomain/zero/1.0/',
 295                         'icon' => '$wgResourceBasePath/resources/assets/licenses/cc-0.png',
 296                 ],
 297                 'gfdl' => [
 298                         'url' => 'https://www.gnu.org/copyleft/fdl.html',
 299                         'icon' => '$wgResourceBasePath/resources/assets/licenses/gnu-fdl.png',
 300                 ],
 301                 'none' => [
 302                         'url' => '',
 303                         'icon' => '',
 304                         'text' => ''
 305                 ],
 306                 'cc-choose' => [
 307                         // Details will be filled in by the selector.
 308                         'url' => '',
 309                         'icon' => '',
 310                         'text' => '',
 311                 ],
 312         ];
 313
 314         /**
 315          * URL to mediawiki-announce subscription
 316          */
 317         protected $mediaWikiAnnounceUrl =
 318                 'https://lists.wikimedia.org/mailman/subscribe/mediawiki-announce';
 319
 320         /**
 321          * Supported language codes for Mailman
 322          */
 323         protected $mediaWikiAnnounceLanguages = [
 324                 'ca', 'cs', 'da', 'de', 'en', 'es', 'et', 'eu', 'fi', 'fr', 'hr', 'hu',
 325                 'it', 'ja', 'ko', 'lt', 'nl', 'no', 'pl', 'pt', 'pt-br', 'ro', 'ru',
 326                 'sl', 'sr', 'sv', 'tr', 'uk'
 327         ];
 328
 329         /**
 330          * UI interface for displaying a short message
 331          * The parameters are like parameters to wfMessage().
 332          * The messages will be in wikitext format, which will be converted to an
 333          * output format such as HTML or text before being sent to the user.
 334          * @param string $msg
 335          */
 336         abstract public function showMessage( $msg /*, ... */ );
 337
 338         /**
 339          * Same as showMessage(), but for displaying errors
 340          * @param string $msg
 341          */
 342         abstract public function showError( $msg /*, ... */ );
 343
 344         /**
 345          * Show a message to the installing user by using a Status object
 346          * @param Status $status
 347          */
 348         abstract public function showStatusMessage( Status $status );
 349
 350         /**
 351          * Constructs a Config object that contains configuration settings that should be
 352          * overwritten for the installation process.
 353          *
 354          * @since 1.27
 355          *
 356          * @param Config $baseConfig
 357          *
 358          * @return Config The config to use during installation.
 359          */
 360         public static function getInstallerConfig( Config $baseConfig ) {
 361                 $configOverrides = new HashConfig();
 362
 363                 // disable (problematic) object cache types explicitly, preserving all other (working) ones
 364                 // bug T113843
 365                 $emptyCache = [ 'class' => 'EmptyBagOStuff' ];
 366
 367                 $objectCaches = [
 368                                 CACHE_NONE => $emptyCache,
 369                                 CACHE_DB => $emptyCache,
 370                                 CACHE_ANYTHING => $emptyCache,
 371                                 CACHE_MEMCACHED => $emptyCache,
 372                         ] + $baseConfig->get( 'ObjectCaches' );
 373
 374                 $configOverrides->set( 'ObjectCaches', $objectCaches );
 375
 376                 // Load the installer's i18n.
 377                 $messageDirs = $baseConfig->get( 'MessagesDirs' );
 378                 $messageDirs['MediawikiInstaller'] = __DIR__ . '/i18n';
 379
 380                 $configOverrides->set( 'MessagesDirs', $messageDirs );
 381
 382                 $installerConfig = new MultiConfig( [ $configOverrides, $baseConfig ] );
 383
 384                 // make sure we use the installer config as the main config
 385                 $configRegistry = $baseConfig->get( 'ConfigRegistry' );
 386                 $configRegistry['main'] = function() use ( $installerConfig ) {
 387                         return $installerConfig;
 388                 };
 389
 390                 $configOverrides->set( 'ConfigRegistry', $configRegistry );
 391
 392                 return $installerConfig;
 393         }
 394
 395         /**
 396          * Constructor, always call this from child classes.
 397          */
 398         public function __construct() {
 399                 global $wgMemc, $wgUser, $wgObjectCaches;
 400
 401                 $defaultConfig = new GlobalVarConfig(); // all the stuff from DefaultSettings.php
 402                 $installerConfig = self::getInstallerConfig( $defaultConfig );
 403
 404                 // Reset all services and inject config overrides
 405                 MediaWiki\MediaWikiServices::resetGlobalInstance( $installerConfig );
 406
 407                 // Don't attempt to load user language options (T126177)
 408                 // This will be overridden in the web installer with the user-specified language
 409                 RequestContext::getMain()->setLanguage( 'en' );
 410
 411                 // Disable the i18n cache
 412                 // TODO: manage LocalisationCache singleton in MediaWikiServices
 413                 Language::getLocalisationCache()->disableBackend();
 414
 415                 // Disable all global services, since we don't have any configuration yet!
 416                 MediaWiki\MediaWikiServices::disableStorageBackend();
 417
 418                 // Disable object cache (otherwise CACHE_ANYTHING will try CACHE_DB and
 419                 // SqlBagOStuff will then throw since we just disabled wfGetDB)
 420                 $wgObjectCaches = MediaWikiServices::getInstance()->getMainConfig()->get( 'ObjectCaches' );
 421                 $wgMemc = ObjectCache::getInstance( CACHE_NONE );
 422
 423                 // Having a user with id = 0 safeguards us from DB access via User::loadOptions().
 424                 $wgUser = User::newFromId( 0 );
 425                 RequestContext::getMain()->setUser( $wgUser );
 426
 427                 $this->settings = $this->internalDefaults;
 428
 429                 foreach ( $this->defaultVarNames as $var ) {
 430                         $this->settings[$var] = $GLOBALS[$var];
 431                 }
 432
 433                 $this->doEnvironmentPreps();
 434
 435                 $this->compiledDBs = [];
 436                 foreach ( self::getDBTypes() as $type ) {
 437                         $installer = $this->getDBInstaller( $type );
 438
 439                         if ( !$installer->isCompiled() ) {
 440                                 continue;
 441                         }
 442                         $this->compiledDBs[] = $type;
 443                 }
 444
 445                 $this->parserTitle = Title::newFromText( 'Installer' );
 446                 $this->parserOptions = new ParserOptions( $wgUser ); // language will be wrong :(
 447                 $this->parserOptions->setEditSection( false );
 448         }
 449
 450         /**
 451          * Get a list of known DB types.
 452          *
 453          * @return array
 454          */
 455         public static function getDBTypes() {
 456                 return self::$dbTypes;
 457         }
 458
 459         /**
 460          * Do initial checks of the PHP environment. Set variables according to
 461          * the observed environment.
 462          *
 463          * It's possible that this may be called under the CLI SAPI, not the SAPI
 464          * that the wiki will primarily run under. In that case, the subclass should
 465          * initialise variables such as wgScriptPath, before calling this function.
 466          *
 467          * Under the web subclass, it can already be assumed that PHP 5+ is in use
 468          * and that sessions are working.
 469          *
 470          * @return Status
 471          */
 472         public function doEnvironmentChecks() {
 473                 // Php version has already been checked by entry scripts
 474                 // Show message here for information purposes
 475                 if ( wfIsHHVM() ) {
 476                         $this->showMessage( 'config-env-hhvm', HHVM_VERSION );
 477                 } else {
 478                         $this->showMessage( 'config-env-php', PHP_VERSION );
 479                 }
 480
 481                 $good = true;
 482                 // Must go here because an old version of PCRE can prevent other checks from completing
 483                 list( $pcreVersion ) = explode( ' ', PCRE_VERSION, 2 );
 484                 if ( version_compare( $pcreVersion, self::MINIMUM_PCRE_VERSION, '<' ) ) {
 485                         $this->showError( 'config-pcre-old', self::MINIMUM_PCRE_VERSION, $pcreVersion );
 486                         $good = false;
 487                 } else {
 488                         foreach ( $this->envChecks as $check ) {
 489                                 $status = $this->$check();
 490                                 if ( $status === false ) {
 491                                         $good = false;
 492                                 }
 493                         }
 494                 }
 495
 496                 $this->setVar( '_Environment', $good );
 497
 498                 return $good ? Status::newGood() : Status::newFatal( 'config-env-bad' );
 499         }
 500
 501         public function doEnvironmentPreps() {
 502                 foreach ( $this->envPreps as $prep ) {
 503                         $this->$prep();
 504                 }
 505         }
 506
 507         /**
 508          * Set a MW configuration variable, or internal installer configuration variable.
 509          *
 510          * @param string $name
 511          * @param mixed $value
 512          */
 513         public function setVar( $name, $value ) {
 514                 $this->settings[$name] = $value;
 515         }
 516
 517         /**
 518          * Get an MW configuration variable, or internal installer configuration variable.
 519          * The defaults come from $GLOBALS (ultimately DefaultSettings.php).
 520          * Installer variables are typically prefixed by an underscore.
 521          *
 522          * @param string $name
 523          * @param mixed $default
 524          *
 525          * @return mixed
 526          */
 527         public function getVar( $name, $default = null ) {
 528                 if ( !isset( $this->settings[$name] ) ) {
 529                         return $default;
 530                 } else {
 531                         return $this->settings[$name];
 532                 }
 533         }
 534
 535         /**
 536          * Get a list of DBs supported by current PHP setup
 537          *
 538          * @return array
 539          */
 540         public function getCompiledDBs() {
 541                 return $this->compiledDBs;
 542         }
 543
 544         /**
 545          * Get an instance of DatabaseInstaller for the specified DB type.
 546          *
 547          * @param mixed $type DB installer for which is needed, false to use default.
 548          *
 549          * @return DatabaseInstaller
 550          */
 551         public function getDBInstaller( $type = false ) {
 552                 if ( !$type ) {
 553                         $type = $this->getVar( 'wgDBtype' );
 554                 }
 555
 556                 $type = strtolower( $type );
 557
 558                 if ( !isset( $this->dbInstallers[$type] ) ) {
 559                         $class = ucfirst( $type ) . 'Installer';
 560                         $this->dbInstallers[$type] = new $class( $this );
 561                 }
 562
 563                 return $this->dbInstallers[$type];
 564         }
 565
 566         /**
 567          * Determine if LocalSettings.php exists. If it does, return its variables.
 568          *
 569          * @return array
 570          */
 571         public static function getExistingLocalSettings() {
 572                 global $IP;
 573
 574                 // You might be wondering why this is here. Well if you don't do this
 575                 // then some poorly-formed extensions try to call their own classes
 576                 // after immediately registering them. We really need to get extension
 577                 // registration out of the global scope and into a real format.
 578                 // @see https://phabricator.wikimedia.org/T69440
 579                 global $wgAutoloadClasses;
 580                 $wgAutoloadClasses = [];
 581
 582                 // @codingStandardsIgnoreStart
 583                 // LocalSettings.php should not call functions, except wfLoadSkin/wfLoadExtensions
 584                 // Define the required globals here, to ensure, the functions can do it work correctly.
 585                 global $wgExtensionDirectory, $wgStyleDirectory;
 586                 // @codingStandardsIgnoreEnd
 587
 588                 MediaWiki\suppressWarnings();
 589                 $_lsExists = file_exists( "$IP/LocalSettings.php" );
 590                 MediaWiki\restoreWarnings();
 591
 592                 if ( !$_lsExists ) {
 593                         return false;
 594                 }
 595                 unset( $_lsExists );
 596
 597                 require "$IP/includes/DefaultSettings.php";
 598                 require "$IP/LocalSettings.php";
 599
 600                 return get_defined_vars();
 601         }
 602
 603         /**
 604          * Get a fake password for sending back to the user in HTML.
 605          * This is a security mechanism to avoid compromise of the password in the
 606          * event of session ID compromise.
 607          *
 608          * @param string $realPassword
 609          *
 610          * @return string
 611          */
 612         public function getFakePassword( $realPassword ) {
 613                 return str_repeat( '*', strlen( $realPassword ) );
 614         }
 615
 616         /**
 617          * Set a variable which stores a password, except if the new value is a
 618          * fake password in which case leave it as it is.
 619          *
 620          * @param string $name
 621          * @param mixed $value
 622          */
 623         public function setPassword( $name, $value ) {
 624                 if ( !preg_match( '/^\*+$/', $value ) ) {
 625                         $this->setVar( $name, $value );
 626                 }
 627         }
 628
 629         /**
 630          * On POSIX systems return the primary group of the webserver we're running under.
 631          * On other systems just returns null.
 632          *
 633          * This is used to advice the user that he should chgrp his mw-config/data/images directory as the
 634          * webserver user before he can install.
 635          *
 636          * Public because SqliteInstaller needs it, and doesn't subclass Installer.
 637          *
 638          * @return mixed
 639          */
 640         public static function maybeGetWebserverPrimaryGroup() {
 641                 if ( !function_exists( 'posix_getegid' ) || !function_exists( 'posix_getpwuid' ) ) {
 642                         # I don't know this, this isn't UNIX.
 643                         return null;
 644                 }
 645
 646                 # posix_getegid() *not* getmygid() because we want the group of the webserver,
 647                 # not whoever owns the current script.
 648                 $gid = posix_getegid();
 649                 $group = posix_getpwuid( $gid )['name'];
 650
 651                 return $group;
 652         }
 653
 654         /**
 655          * Convert wikitext $text to HTML.
 656          *
 657          * This is potentially error prone since many parser features require a complete
 658          * installed MW database. The solution is to just not use those features when you
 659          * write your messages. This appears to work well enough. Basic formatting and
 660          * external links work just fine.
 661          *
 662          * But in case a translator decides to throw in a "#ifexist" or internal link or
 663          * whatever, this function is guarded to catch the attempted DB access and to present
 664          * some fallback text.
 665          *
 666          * @param string $text
 667          * @param bool $lineStart
 668          * @return string
 669          */
 670         public function parse( $text, $lineStart = false ) {
 671                 global $wgParser;
 672
 673                 try {
 674                         $out = $wgParser->parse( $text, $this->parserTitle, $this->parserOptions, $lineStart );
 675                         $html = $out->getText();
 676                 } catch ( DBAccessError $e ) {
 677                         $html = '<!--DB access attempted during parse-->  ' . htmlspecialchars( $text );
 678
 679                         if ( !empty( $this->debug ) ) {
 680                                 $html .= "<!--\n" . $e->getTraceAsString() . "\n-->";
 681                         }
 682                 }
 683
 684                 return $html;
 685         }
 686
 687         /**
 688          * @return ParserOptions
 689          */
 690         public function getParserOptions() {
 691                 return $this->parserOptions;
 692         }
 693
 694         public function disableLinkPopups() {
 695                 $this->parserOptions->setExternalLinkTarget( false );
 696         }
 697
 698         public function restoreLinkPopups() {
 699                 global $wgExternalLinkTarget;
 700                 $this->parserOptions->setExternalLinkTarget( $wgExternalLinkTarget );
 701         }
 702
 703         /**
 704          * Install step which adds a row to the site_stats table with appropriate
 705          * initial values.
 706          *
 707          * @param DatabaseInstaller $installer
 708          *
 709          * @return Status
 710          */
 711         public function populateSiteStats( DatabaseInstaller $installer ) {
 712                 $status = $installer->getConnection();
 713                 if ( !$status->isOK() ) {
 714                         return $status;
 715                 }
 716                 $status->value->insert(
 717                         'site_stats',
 718                         [
 719                                 'ss_row_id' => 1,
 720                                 'ss_total_edits' => 0,
 721                                 'ss_good_articles' => 0,
 722                                 'ss_total_pages' => 0,
 723                                 'ss_users' => 0,
 724                                 'ss_images' => 0
 725                         ],
 726                         __METHOD__, 'IGNORE'
 727                 );
 728
 729                 return Status::newGood();
 730         }
 731
 732         /**
 733          * Environment check for DB types.
 734          * @return bool
 735          */
 736         protected function envCheckDB() {
 737                 global $wgLang;
 738
 739                 $allNames = [];
 740
 741                 // Messages: config-type-mysql, config-type-postgres, config-type-oracle,
 742                 // config-type-sqlite
 743                 foreach ( self::getDBTypes() as $name ) {
 744                         $allNames[] = wfMessage( "config-type-$name" )->text();
 745                 }
 746
 747                 $databases = $this->getCompiledDBs();
 748
 749                 $databases = array_flip( $databases );
 750                 foreach ( array_keys( $databases ) as $db ) {
 751                         $installer = $this->getDBInstaller( $db );
 752                         $status = $installer->checkPrerequisites();
 753                         if ( !$status->isGood() ) {
 754                                 $this->showStatusMessage( $status );
 755                         }
 756                         if ( !$status->isOK() ) {
 757                                 unset( $databases[$db] );
 758                         }
 759                 }
 760                 $databases = array_flip( $databases );
 761                 if ( !$databases ) {
 762                         $this->showError( 'config-no-db', $wgLang->commaList( $allNames ), count( $allNames ) );
 763
 764                         // @todo FIXME: This only works for the web installer!
 765                         return false;
 766                 }
 767
 768                 return true;
 769         }
 770
 771         /**
 772          * Some versions of libxml+PHP break < and > encoding horribly
 773          * @return bool
 774          */
 775         protected function envCheckBrokenXML() {
 776                 $test = new PhpXmlBugTester();
 777                 if ( !$test->ok ) {
 778                         $this->showError( 'config-brokenlibxml' );
 779
 780                         return false;
 781                 }
 782
 783                 return true;
 784         }
 785
 786         /**
 787          * Environment check for the PCRE module.
 788          *
 789          * @note If this check were to fail, the parser would
 790          *   probably throw an exception before the result
 791          *   of this check is shown to the user.
 792          * @return bool
 793          */
 794         protected function envCheckPCRE() {
 795                 MediaWiki\suppressWarnings();
 796                 $regexd = preg_replace( '/[\x{0430}-\x{04FF}]/iu', '', '-АБВГД-' );
 797                 // Need to check for \p support too, as PCRE can be compiled
 798                 // with utf8 support, but not unicode property support.
 799                 // check that \p{Zs} (space separators) matches
 800                 // U+3000 (Ideographic space)
 801                 $regexprop = preg_replace( '/\p{Zs}/u', '', "-\xE3\x80\x80-" );
 802                 MediaWiki\restoreWarnings();
 803                 if ( $regexd != '--' || $regexprop != '--' ) {
 804                         $this->showError( 'config-pcre-no-utf8' );
 805
 806                         return false;
 807                 }
 808
 809                 return true;
 810         }
 811
 812         /**
 813          * Environment check for available memory.
 814          * @return bool
 815          */
 816         protected function envCheckMemory() {
 817                 $limit = ini_get( 'memory_limit' );
 818
 819                 if ( !$limit || $limit == -1 ) {
 820                         return true;
 821                 }
 822
 823                 $n = wfShorthandToInteger( $limit );
 824
 825                 if ( $n < $this->minMemorySize * 1024 * 1024 ) {
 826                         $newLimit = "{$this->minMemorySize}M";
 827
 828                         if ( ini_set( "memory_limit", $newLimit ) === false ) {
 829                                 $this->showMessage( 'config-memory-bad', $limit );
 830                         } else {
 831                                 $this->showMessage( 'config-memory-raised', $limit, $newLimit );
 832                                 $this->setVar( '_RaiseMemory', true );
 833                         }
 834                 }
 835
 836                 return true;
 837         }
 838
 839         /**
 840          * Environment check for compiled object cache types.
 841          */
 842         protected function envCheckCache() {
 843                 $caches = [];
 844                 foreach ( $this->objectCaches as $name => $function ) {
 845                         if ( function_exists( $function ) ) {
 846                                 if ( $name == 'xcache' && !wfIniGetBool( 'xcache.var_size' ) ) {
 847                                         continue;
 848                                 }
 849                                 $caches[$name] = true;
 850                         }
 851                 }
 852
 853                 if ( !$caches ) {
 854                         $key = 'config-no-cache-apcu';
 855                         $this->showMessage( $key );
 856                 }
 857
 858                 $this->setVar( '_Caches', $caches );
 859         }
 860
 861         /**
 862          * Scare user to death if they have mod_security or mod_security2
 863          * @return bool
 864          */
 865         protected function envCheckModSecurity() {
 866                 if ( self::apacheModulePresent( 'mod_security' )
 867                         || self::apacheModulePresent( 'mod_security2' ) ) {
 868                         $this->showMessage( 'config-mod-security' );
 869                 }
 870
 871                 return true;
 872         }
 873
 874         /**
 875          * Search for GNU diff3.
 876          * @return bool
 877          */
 878         protected function envCheckDiff3() {
 879                 $names = [ "gdiff3", "diff3", "diff3.exe" ];
 880                 $versionInfo = [ '$1 --version 2>&1', 'GNU diffutils' ];
 881
 882                 $diff3 = self::locateExecutableInDefaultPaths( $names, $versionInfo );
 883
 884                 if ( $diff3 ) {
 885                         $this->setVar( 'wgDiff3', $diff3 );
 886                 } else {
 887                         $this->setVar( 'wgDiff3', false );
 888                         $this->showMessage( 'config-diff3-bad' );
 889                 }
 890
 891                 return true;
 892         }
 893
 894         /**
 895          * Environment check for ImageMagick and GD.
 896          * @return bool
 897          */
 898         protected function envCheckGraphics() {
 899                 $names = [ wfIsWindows() ? 'convert.exe' : 'convert' ];
 900                 $versionInfo = [ '$1 -version', 'ImageMagick' ];
 901                 $convert = self::locateExecutableInDefaultPaths( $names, $versionInfo );
 902
 903                 $this->setVar( 'wgImageMagickConvertCommand', '' );
 904                 if ( $convert ) {
 905                         $this->setVar( 'wgImageMagickConvertCommand', $convert );
 906                         $this->showMessage( 'config-imagemagick', $convert );
 907
 908                         return true;
 909                 } elseif ( function_exists( 'imagejpeg' ) ) {
 910                         $this->showMessage( 'config-gd' );
 911                 } else {
 912                         $this->showMessage( 'config-no-scaling' );
 913                 }
 914
 915                 return true;
 916         }
 917
 918         /**
 919          * Search for git.
 920          *
 921          * @since 1.22
 922          * @return bool
 923          */
 924         protected function envCheckGit() {
 925                 $names = [ wfIsWindows() ? 'git.exe' : 'git' ];
 926                 $versionInfo = [ '$1 --version', 'git version' ];
 927
 928                 $git = self::locateExecutableInDefaultPaths( $names, $versionInfo );
 929
 930                 if ( $git ) {
 931                         $this->setVar( 'wgGitBin', $git );
 932                         $this->showMessage( 'config-git', $git );
 933                 } else {
 934                         $this->setVar( 'wgGitBin', false );
 935                         $this->showMessage( 'config-git-bad' );
 936                 }
 937
 938                 return true;
 939         }
 940
 941         /**
 942          * Environment check to inform user which server we've assumed.
 943          *
 944          * @return bool
 945          */
 946         protected function envCheckServer() {
 947                 $server = $this->envGetDefaultServer();
 948                 if ( $server !== null ) {
 949                         $this->showMessage( 'config-using-server', $server );
 950                 }
 951                 return true;
 952         }
 953
 954         /**
 955          * Environment check to inform user which paths we've assumed.
 956          *
 957          * @return bool
 958          */
 959         protected function envCheckPath() {
 960                 $this->showMessage(
 961                         'config-using-uri',
 962                         $this->getVar( 'wgServer' ),
 963                         $this->getVar( 'wgScriptPath' )
 964                 );
 965                 return true;
 966         }
 967
 968         /**
 969          * Environment check for preferred locale in shell
 970          * @return bool
 971          */
 972         protected function envCheckShellLocale() {
 973                 $os = php_uname( 's' );
 974                 $supported = [ 'Linux', 'SunOS', 'HP-UX', 'Darwin' ]; # Tested these
 975
 976                 if ( !in_array( $os, $supported ) ) {
 977                         return true;
 978                 }
 979
 980                 # Get a list of available locales.
 981                 $ret = false;
 982                 $lines = wfShellExec( '/usr/bin/locale -a', $ret );
 983
 984                 if ( $ret ) {
 985                         return true;
 986                 }
 987
 988                 $lines = array_map( 'trim', explode( "\n", $lines ) );
 989                 $candidatesByLocale = [];
 990                 $candidatesByLang = [];
 991
 992                 foreach ( $lines as $line ) {
 993                         if ( $line === '' ) {
 994                                 continue;
 995                         }
 996
 997                         if ( !preg_match( '/^([a-zA-Z]+)(_[a-zA-Z]+|)\.(utf8|UTF-8)(@[a-zA-Z_]*|)$/i', $line, $m ) ) {
 998                                 continue;
 999                         }
1000
1001                         list( , $lang, , , ) = $m;
1002
1003                         $candidatesByLocale[$m[0]] = $m;
1004                         $candidatesByLang[$lang][] = $m;
1005                 }
1006
1007                 # Try the current value of LANG.
1008                 if ( isset( $candidatesByLocale[getenv( 'LANG' )] ) ) {
1009                         $this->setVar( 'wgShellLocale', getenv( 'LANG' ) );
1010
1011                         return true;
1012                 }
1013
1014                 # Try the most common ones.
1015                 $commonLocales = [ 'en_US.UTF-8', 'en_US.utf8', 'de_DE.UTF-8', 'de_DE.utf8' ];
1016                 foreach ( $commonLocales as $commonLocale ) {
1017                         if ( isset( $candidatesByLocale[$commonLocale] ) ) {
1018                                 $this->setVar( 'wgShellLocale', $commonLocale );
1019
1020                                 return true;
1021                         }
1022                 }
1023
1024                 # Is there an available locale in the Wiki's language?
1025                 $wikiLang = $this->getVar( 'wgLanguageCode' );
1026
1027                 if ( isset( $candidatesByLang[$wikiLang] ) ) {
1028                         $m = reset( $candidatesByLang[$wikiLang] );
1029                         $this->setVar( 'wgShellLocale', $m[0] );
1030
1031                         return true;
1032                 }
1033
1034                 # Are there any at all?
1035                 if ( count( $candidatesByLocale ) ) {
1036                         $m = reset( $candidatesByLocale );
1037                         $this->setVar( 'wgShellLocale', $m[0] );
1038
1039                         return true;
1040                 }
1041
1042                 # Give up.
1043                 return true;
1044         }
1045
1046         /**
1047          * Environment check for the permissions of the uploads directory
1048          * @return bool
1049          */
1050         protected function envCheckUploadsDirectory() {
1051                 global $IP;
1052
1053                 $dir = $IP . '/images/';
1054                 $url = $this->getVar( 'wgServer' ) . $this->getVar( 'wgScriptPath' ) . '/images/';
1055                 $safe = !$this->dirIsExecutable( $dir, $url );
1056
1057                 if ( !$safe ) {
1058                         $this->showMessage( 'config-uploads-not-safe', $dir );
1059                 }
1060
1061                 return true;
1062         }
1063
1064         /**
1065          * Checks if suhosin.get.max_value_length is set, and if so generate
1066          * a warning because it decreases ResourceLoader performance.
1067          * @return bool
1068          */
1069         protected function envCheckSuhosinMaxValueLength() {
1070                 $maxValueLength = ini_get( 'suhosin.get.max_value_length' );
1071                 if ( $maxValueLength > 0 && $maxValueLength < 1024 ) {
1072                         // Only warn if the value is below the sane 1024
1073                         $this->showMessage( 'config-suhosin-max-value-length', $maxValueLength );
1074                 }
1075
1076                 return true;
1077         }
1078
1079         /**
1080          * Convert a hex string representing a Unicode code point to that code point.
1081          * @param string $c
1082          * @return string
1083          */
1084         protected function unicodeChar( $c ) {
1085                 $c = hexdec( $c );
1086                 if ( $c <= 0x7F ) {
1087                         return chr( $c );
1088                 } elseif ( $c <= 0x7FF ) {
1089                         return chr( 0xC0 | $c >> 6 ) . chr( 0x80 | $c & 0x3F );
1090                 } elseif ( $c <= 0xFFFF ) {
1091                         return chr( 0xE0 | $c >> 12 ) . chr( 0x80 | $c >> 6 & 0x3F ) .
1092                                 chr( 0x80 | $c & 0x3F );
1093                 } elseif ( $c <= 0x10FFFF ) {
1094                         return chr( 0xF0 | $c >> 18 ) . chr( 0x80 | $c >> 12 & 0x3F ) .
1095                                 chr( 0x80 | $c >> 6 & 0x3F ) .
1096                                 chr( 0x80 | $c & 0x3F );
1097                 } else {
1098                         return false;
1099                 }
1100         }
1101
1102         /**
1103          * Check the libicu version
1104          */
1105         protected function envCheckLibicu() {
1106                 /**
1107                  * This needs to be updated something that the latest libicu
1108                  * will properly normalize.  This normalization was found at
1109                  * http://www.unicode.org/versions/Unicode5.2.0/#Character_Additions
1110                  * Note that we use the hex representation to create the code
1111                  * points in order to avoid any Unicode-destroying during transit.
1112                  */
1113                 $not_normal_c = $this->unicodeChar( "FA6C" );
1114                 $normal_c = $this->unicodeChar( "242EE" );
1115
1116                 $useNormalizer = 'php';
1117                 $needsUpdate = false;
1118
1119                 if ( function_exists( 'normalizer_normalize' ) ) {
1120                         $useNormalizer = 'intl';
1121                         $intl = normalizer_normalize( $not_normal_c, Normalizer::FORM_C );
1122                         if ( $intl !== $normal_c ) {
1123                                 $needsUpdate = true;
1124                         }
1125                 }
1126
1127                 // Uses messages 'config-unicode-using-php' and 'config-unicode-using-intl'
1128                 if ( $useNormalizer === 'php' ) {
1129                         $this->showMessage( 'config-unicode-pure-php-warning' );
1130                 } else {
1131                         $this->showMessage( 'config-unicode-using-' . $useNormalizer );
1132                         if ( $needsUpdate ) {
1133                                 $this->showMessage( 'config-unicode-update-warning' );
1134                         }
1135                 }
1136         }
1137
1138         /**
1139          * Environment prep for the server hostname.
1140          */
1141         protected function envPrepServer() {
1142                 $server = $this->envGetDefaultServer();
1143                 if ( $server !== null ) {
1144                         $this->setVar( 'wgServer', $server );
1145                 }
1146         }
1147
1148         /**
1149          * Helper function to be called from envPrepServer()
1150          * @return string
1151          */
1152         abstract protected function envGetDefaultServer();
1153
1154         /**
1155          * Environment prep for setting $IP and $wgScriptPath.
1156          */
1157         protected function envPrepPath() {
1158                 global $IP;
1159                 $IP = dirname( dirname( __DIR__ ) );
1160                 $this->setVar( 'IP', $IP );
1161         }
1162
1163         /**
1164          * Get an array of likely places we can find executables. Check a bunch
1165          * of known Unix-like defaults, as well as the PATH environment variable
1166          * (which should maybe make it work for Windows?)
1167          *
1168          * @return array
1169          */
1170         protected static function getPossibleBinPaths() {
1171                 return array_merge(
1172                         [ '/usr/bin', '/usr/local/bin', '/opt/csw/bin',
1173                                 '/usr/gnu/bin', '/usr/sfw/bin', '/sw/bin', '/opt/local/bin' ],
1174                         explode( PATH_SEPARATOR, getenv( 'PATH' ) )
1175                 );
1176         }
1177
1178         /**
1179          * Search a path for any of the given executable names. Returns the
1180          * executable name if found. Also checks the version string returned
1181          * by each executable.
1182          *
1183          * Used only by environment checks.
1184          *
1185          * @param string $path Path to search
1186          * @param array $names Array of executable names
1187          * @param array|bool $versionInfo False or array with two members:
1188          *   0 => Command to run for version check, with $1 for the full executable name
1189          *   1 => String to compare the output with
1190          *
1191          * If $versionInfo is not false, only executables with a version
1192          * matching $versionInfo[1] will be returned.
1193          * @return bool|string
1194          */
1195         public static function locateExecutable( $path, $names, $versionInfo = false ) {
1196                 if ( !is_array( $names ) ) {
1197                         $names = [ $names ];
1198                 }
1199
1200                 foreach ( $names as $name ) {
1201                         $command = $path . DIRECTORY_SEPARATOR . $name;
1202
1203                         MediaWiki\suppressWarnings();
1204                         $file_exists = is_executable( $command );
1205                         MediaWiki\restoreWarnings();
1206
1207                         if ( $file_exists ) {
1208                                 if ( !$versionInfo ) {
1209                                         return $command;
1210                                 }
1211
1212                                 $file = str_replace( '$1', wfEscapeShellArg( $command ), $versionInfo[0] );
1213                                 if ( strstr( wfShellExec( $file ), $versionInfo[1] ) !== false ) {
1214                                         return $command;
1215                                 }
1216                         }
1217                 }
1218
1219                 return false;
1220         }
1221
1222         /**
1223          * Same as locateExecutable(), but checks in getPossibleBinPaths() by default
1224          * @see locateExecutable()
1225          * @param array $names Array of possible names.
1226          * @param array|bool $versionInfo Default: false or array with two members:
1227          *   0 => Command to run for version check, with $1 for the full executable name
1228          *   1 => String to compare the output with
1229          *
1230          * If $versionInfo is not false, only executables with a version
1231          * matching $versionInfo[1] will be returned.
1232          * @return bool|string
1233          */
1234         public static function locateExecutableInDefaultPaths( $names, $versionInfo = false ) {
1235                 foreach ( self::getPossibleBinPaths() as $path ) {
1236                         $exe = self::locateExecutable( $path, $names, $versionInfo );
1237                         if ( $exe !== false ) {
1238                                 return $exe;
1239                         }
1240                 }
1241
1242                 return false;
1243         }
1244
1245         /**
1246          * Checks if scripts located in the given directory can be executed via the given URL.
1247          *
1248          * Used only by environment checks.
1249          * @param string $dir
1250          * @param string $url
1251          * @return bool|int|string
1252          */
1253         public function dirIsExecutable( $dir, $url ) {
1254                 $scriptTypes = [
1255                         'php' => [
1256                                 "<?php echo 'ex' . 'ec';",
1257                                 "#!/var/env php5\n<?php echo 'ex' . 'ec';",
1258                         ],
1259                 ];
1260
1261                 // it would be good to check other popular languages here, but it'll be slow.
1262
1263                 MediaWiki\suppressWarnings();
1264
1265                 foreach ( $scriptTypes as $ext => $contents ) {
1266                         foreach ( $contents as $source ) {
1267                                 $file = 'exectest.' . $ext;
1268
1269                                 if ( !file_put_contents( $dir . $file, $source ) ) {
1270                                         break;
1271                                 }
1272
1273                                 try {
1274                                         $text = Http::get( $url . $file, [ 'timeout' => 3 ], __METHOD__ );
1275                                 } catch ( Exception $e ) {
1276                                         // Http::get throws with allow_url_fopen = false and no curl extension.
1277                                         $text = null;
1278                                 }
1279                                 unlink( $dir . $file );
1280
1281                                 if ( $text == 'exec' ) {
1282                                         MediaWiki\restoreWarnings();
1283
1284                                         return $ext;
1285                                 }
1286                         }
1287                 }
1288
1289                 MediaWiki\restoreWarnings();
1290
1291                 return false;
1292         }
1293
1294         /**
1295          * Checks for presence of an Apache module. Works only if PHP is running as an Apache module, too.
1296          *
1297          * @param string $moduleName Name of module to check.
1298          * @return bool
1299          */
1300         public static function apacheModulePresent( $moduleName ) {
1301                 if ( function_exists( 'apache_get_modules' ) && in_array( $moduleName, apache_get_modules() ) ) {
1302                         return true;
1303                 }
1304                 // try it the hard way
1305                 ob_start();
1306                 phpinfo( INFO_MODULES );
1307                 $info = ob_get_clean();
1308
1309                 return strpos( $info, $moduleName ) !== false;
1310         }
1311
1312         /**
1313          * ParserOptions are constructed before we determined the language, so fix it
1314          *
1315          * @param Language $lang
1316          */
1317         public function setParserLanguage( $lang ) {
1318                 $this->parserOptions->setTargetLanguage( $lang );
1319                 $this->parserOptions->setUserLang( $lang );
1320         }
1321
1322         /**
1323          * Overridden by WebInstaller to provide lastPage parameters.
1324          * @param string $page
1325          * @return string
1326          */
1327         protected function getDocUrl( $page ) {
1328                 return "{$_SERVER['PHP_SELF']}?page=" . urlencode( $page );
1329         }
1330
1331         /**
1332          * Finds extensions that follow the format /$directory/Name/Name.php,
1333          * and returns an array containing the value for 'Name' for each found extension.
1334          *
1335          * Reasonable values for $directory include 'extensions' (the default) and 'skins'.
1336          *
1337          * @param string $directory Directory to search in
1338          * @return array
1339          */
1340         public function findExtensions( $directory = 'extensions' ) {
1341                 if ( $this->getVar( 'IP' ) === null ) {
1342                         return [];
1343                 }
1344
1345                 $extDir = $this->getVar( 'IP' ) . '/' . $directory;
1346                 if ( !is_readable( $extDir ) || !is_dir( $extDir ) ) {
1347                         return [];
1348                 }
1349
1350                 // extensions -> extension.json, skins -> skin.json
1351                 $jsonFile = substr( $directory, 0, strlen( $directory ) -1 ) . '.json';
1352
1353                 $dh = opendir( $extDir );
1354                 $exts = [];
1355                 while ( ( $file = readdir( $dh ) ) !== false ) {
1356                         if ( !is_dir( "$extDir/$file" ) ) {
1357                                 continue;
1358                         }
1359                         if ( file_exists( "$extDir/$file/$jsonFile" ) || file_exists( "$extDir/$file/$file.php" ) ) {
1360                                 $exts[] = $file;
1361                         }
1362                 }
1363                 closedir( $dh );
1364                 natcasesort( $exts );
1365
1366                 return $exts;
1367         }
1368
1369         /**
1370          * Returns a default value to be used for $wgDefaultSkin: normally the one set in DefaultSettings,
1371          * but will fall back to another if the default skin is missing and some other one is present
1372          * instead.
1373          *
1374          * @param string[] $skinNames Names of installed skins.
1375          * @return string
1376          */
1377         public function getDefaultSkin( array $skinNames ) {
1378                 $defaultSkin = $GLOBALS['wgDefaultSkin'];
1379                 if ( !$skinNames || in_array( $defaultSkin, $skinNames ) ) {
1380                         return $defaultSkin;
1381                 } else {
1382                         return $skinNames[0];
1383                 }
1384         }
1385
1386         /**
1387          * Installs the auto-detected extensions.
1388          *
1389          * @return Status
1390          */
1391         protected function includeExtensions() {
1392                 global $IP;
1393                 $exts = $this->getVar( '_Extensions' );
1394                 $IP = $this->getVar( 'IP' );
1395
1396                 /**
1397                  * We need to include DefaultSettings before including extensions to avoid
1398                  * warnings about unset variables. However, the only thing we really
1399                  * want here is $wgHooks['LoadExtensionSchemaUpdates']. This won't work
1400                  * if the extension has hidden hook registration in $wgExtensionFunctions,
1401                  * but we're not opening that can of worms
1402                  * @see https://phabricator.wikimedia.org/T28857
1403                  */
1404                 global $wgAutoloadClasses;
1405                 $wgAutoloadClasses = [];
1406                 $queue = [];
1407
1408                 require "$IP/includes/DefaultSettings.php";
1409
1410                 foreach ( $exts as $e ) {
1411                         if ( file_exists( "$IP/extensions/$e/extension.json" ) ) {
1412                                 $queue["$IP/extensions/$e/extension.json"] = 1;
1413                         } else {
1414                                 require_once "$IP/extensions/$e/$e.php";
1415                         }
1416                 }
1417
1418                 $registry = new ExtensionRegistry();
1419                 $data = $registry->readFromQueue( $queue );
1420                 $wgAutoloadClasses += $data['autoload'];
1421
1422                 $hooksWeWant = isset( $wgHooks['LoadExtensionSchemaUpdates'] ) ?
1423                         $wgHooks['LoadExtensionSchemaUpdates'] : [];
1424
1425                 if ( isset( $data['globals']['wgHooks']['LoadExtensionSchemaUpdates'] ) ) {
1426                         $hooksWeWant = array_merge_recursive(
1427                                 $hooksWeWant,
1428                                 $data['globals']['wgHooks']['LoadExtensionSchemaUpdates']
1429                         );
1430                 }
1431                 // Unset everyone else's hooks. Lord knows what someone might be doing
1432                 // in ParserFirstCallInit (see bug 27171)
1433                 $GLOBALS['wgHooks'] = [ 'LoadExtensionSchemaUpdates' => $hooksWeWant ];
1434
1435                 return Status::newGood();
1436         }
1437
1438         /**
1439          * Get an array of install steps. Should always be in the format of
1440          * [
1441          *   'name'     => 'someuniquename',
1442          *   'callback' => [ $obj, 'method' ],
1443          * ]
1444          * There must be a config-install-$name message defined per step, which will
1445          * be shown on install.
1446          *
1447          * @param DatabaseInstaller $installer DatabaseInstaller so we can make callbacks
1448          * @return array
1449          */
1450         protected function getInstallSteps( DatabaseInstaller $installer ) {
1451                 $coreInstallSteps = [
1452                         [ 'name' => 'database', 'callback' => [ $installer, 'setupDatabase' ] ],
1453                         [ 'name' => 'tables', 'callback' => [ $installer, 'createTables' ] ],
1454                         [ 'name' => 'interwiki', 'callback' => [ $installer, 'populateInterwikiTable' ] ],
1455                         [ 'name' => 'stats', 'callback' => [ $this, 'populateSiteStats' ] ],
1456                         [ 'name' => 'keys', 'callback' => [ $this, 'generateKeys' ] ],
1457                         [ 'name' => 'updates', 'callback' => [ $installer, 'insertUpdateKeys' ] ],
1458                         [ 'name' => 'sysop', 'callback' => [ $this, 'createSysop' ] ],
1459                         [ 'name' => 'mainpage', 'callback' => [ $this, 'createMainpage' ] ],
1460                 ];
1461
1462                 // Build the array of install steps starting from the core install list,
1463                 // then adding any callbacks that wanted to attach after a given step
1464                 foreach ( $coreInstallSteps as $step ) {
1465                         $this->installSteps[] = $step;
1466                         if ( isset( $this->extraInstallSteps[$step['name']] ) ) {
1467                                 $this->installSteps = array_merge(
1468                                         $this->installSteps,
1469                                         $this->extraInstallSteps[$step['name']]
1470                                 );
1471                         }
1472                 }
1473
1474                 // Prepend any steps that want to be at the beginning
1475                 if ( isset( $this->extraInstallSteps['BEGINNING'] ) ) {
1476                         $this->installSteps = array_merge(
1477                                 $this->extraInstallSteps['BEGINNING'],
1478                                 $this->installSteps
1479                         );
1480                 }
1481
1482                 // Extensions should always go first, chance to tie into hooks and such
1483                 if ( count( $this->getVar( '_Extensions' ) ) ) {
1484                         array_unshift( $this->installSteps,
1485                                 [ 'name' => 'extensions', 'callback' => [ $this, 'includeExtensions' ] ]
1486                         );
1487                         $this->installSteps[] = [
1488                                 'name' => 'extension-tables',
1489                                 'callback' => [ $installer, 'createExtensionTables' ]
1490                         ];
1491                 }
1492
1493                 return $this->installSteps;
1494         }
1495
1496         /**
1497          * Actually perform the installation.
1498          *
1499          * @param callable $startCB A callback array for the beginning of each step
1500          * @param callable $endCB A callback array for the end of each step
1501          *
1502          * @return array Array of Status objects
1503          */
1504         public function performInstallation( $startCB, $endCB ) {
1505                 $installResults = [];
1506                 $installer = $this->getDBInstaller();
1507                 $installer->preInstall();
1508                 $steps = $this->getInstallSteps( $installer );
1509                 foreach ( $steps as $stepObj ) {
1510                         $name = $stepObj['name'];
1511                         call_user_func_array( $startCB, [ $name ] );
1512
1513                         // Perform the callback step
1514                         $status = call_user_func( $stepObj['callback'], $installer );
1515
1516                         // Output and save the results
1517                         call_user_func( $endCB, $name, $status );
1518                         $installResults[$name] = $status;
1519
1520                         // If we've hit some sort of fatal, we need to bail.
1521                         // Callback already had a chance to do output above.
1522                         if ( !$status->isOk() ) {
1523                                 break;
1524                         }
1525                 }
1526                 if ( $status->isOk() ) {
1527                         $this->setVar( '_InstallDone', true );
1528                 }
1529
1530                 return $installResults;
1531         }
1532
1533         /**
1534          * Generate $wgSecretKey. Will warn if we had to use an insecure random source.
1535          *
1536          * @return Status
1537          */
1538         public function generateKeys() {
1539                 $keys = [ 'wgSecretKey' => 64 ];
1540                 if ( strval( $this->getVar( 'wgUpgradeKey' ) ) === '' ) {
1541                         $keys['wgUpgradeKey'] = 16;
1542                 }
1543
1544                 return $this->doGenerateKeys( $keys );
1545         }
1546
1547         /**
1548          * Generate a secret value for variables using our CryptRand generator.
1549          * Produce a warning if the random source was insecure.
1550          *
1551          * @param array $keys
1552          * @return Status
1553          */
1554         protected function doGenerateKeys( $keys ) {
1555                 $status = Status::newGood();
1556
1557                 $strong = true;
1558                 foreach ( $keys as $name => $length ) {
1559                         $secretKey = MWCryptRand::generateHex( $length, true );
1560                         if ( !MWCryptRand::wasStrong() ) {
1561                                 $strong = false;
1562                         }
1563
1564                         $this->setVar( $name, $secretKey );
1565                 }
1566
1567                 if ( !$strong ) {
1568                         $names = array_keys( $keys );
1569                         $names = preg_replace( '/^(.*)$/', '\$$1', $names );
1570                         global $wgLang;
1571                         $status->warning( 'config-insecure-keys', $wgLang->listToText( $names ), count( $names ) );
1572                 }
1573
1574                 return $status;
1575         }
1576
1577         /**
1578          * Create the first user account, grant it sysop and bureaucrat rights
1579          *
1580          * @return Status
1581          */
1582         protected function createSysop() {
1583                 $name = $this->getVar( '_AdminName' );
1584                 $user = User::newFromName( $name );
1585
1586                 if ( !$user ) {
1587                         // We should've validated this earlier anyway!
1588                         return Status::newFatal( 'config-admin-error-user', $name );
1589                 }
1590
1591                 if ( $user->idForName() == 0 ) {
1592                         $user->addToDatabase();
1593
1594                         try {
1595                                 $user->setPassword( $this->getVar( '_AdminPassword' ) );
1596                         } catch ( PasswordError $pwe ) {
1597                                 return Status::newFatal( 'config-admin-error-password', $name, $pwe->getMessage() );
1598                         }
1599
1600                         $user->addGroup( 'sysop' );
1601                         $user->addGroup( 'bureaucrat' );
1602                         if ( $this->getVar( '_AdminEmail' ) ) {
1603                                 $user->setEmail( $this->getVar( '_AdminEmail' ) );
1604                         }
1605                         $user->saveSettings();
1606
1607                         // Update user count
1608                         $ssUpdate = new SiteStatsUpdate( 0, 0, 0, 0, 1 );
1609                         $ssUpdate->doUpdate();
1610                 }
1611                 $status = Status::newGood();
1612
1613                 if ( $this->getVar( '_Subscribe' ) && $this->getVar( '_AdminEmail' ) ) {
1614                         $this->subscribeToMediaWikiAnnounce( $status );
1615                 }
1616
1617                 return $status;
1618         }
1619
1620         /**
1621          * @param Status $s
1622          */
1623         private function subscribeToMediaWikiAnnounce( Status $s ) {
1624                 $params = [
1625                         'email' => $this->getVar( '_AdminEmail' ),
1626                         'language' => 'en',
1627                         'digest' => 0
1628                 ];
1629
1630                 // Mailman doesn't support as many languages as we do, so check to make
1631                 // sure their selected language is available
1632                 $myLang = $this->getVar( '_UserLang' );
1633                 if ( in_array( $myLang, $this->mediaWikiAnnounceLanguages ) ) {
1634                         $myLang = $myLang == 'pt-br' ? 'pt_BR' : $myLang; // rewrite to Mailman's pt_BR
1635                         $params['language'] = $myLang;
1636                 }
1637
1638                 if ( MWHttpRequest::canMakeRequests() ) {
1639                         $res = MWHttpRequest::factory( $this->mediaWikiAnnounceUrl,
1640                                 [ 'method' => 'POST', 'postData' => $params ], __METHOD__ )->execute();
1641                         if ( !$res->isOK() ) {
1642                                 $s->warning( 'config-install-subscribe-fail', $res->getMessage() );
1643                         }
1644                 } else {
1645                         $s->warning( 'config-install-subscribe-notpossible' );
1646                 }
1647         }
1648
1649         /**
1650          * Insert Main Page with default content.
1651          *
1652          * @param DatabaseInstaller $installer
1653          * @return Status
1654          */
1655         protected function createMainpage( DatabaseInstaller $installer ) {
1656                 $status = Status::newGood();
1657                 try {
1658                         $page = WikiPage::factory( Title::newMainPage() );
1659                         $content = new WikitextContent(
1660                                 wfMessage( 'mainpagetext' )->inContentLanguage()->text() . "\n\n" .
1661                                 wfMessage( 'mainpagedocfooter' )->inContentLanguage()->text()
1662                         );
1663
1664                         $status = $page->doEditContent( $content,
1665                                 '',
1666                                 EDIT_NEW,
1667                                 false,
1668                                 User::newFromName( 'MediaWiki default' )
1669                         );
1670                 } catch ( Exception $e ) {
1671                         // using raw, because $wgShowExceptionDetails can not be set yet
1672                         $status->fatal( 'config-install-mainpage-failed', $e->getMessage() );
1673                 }
1674
1675                 return $status;
1676         }
1677
1678         /**
1679          * Override the necessary bits of the config to run an installation.
1680          */
1681         public static function overrideConfig() {
1682                 // Use PHP's built-in session handling, since MediaWiki's
1683                 // SessionHandler can't work before we have an object cache set up.
1684                 define( 'MW_NO_SESSION_HANDLER', 1 );
1685
1686                 // Don't access the database
1687                 $GLOBALS['wgUseDatabaseMessages'] = false;
1688                 // Don't cache langconv tables
1689                 $GLOBALS['wgLanguageConverterCacheType'] = CACHE_NONE;
1690                 // Debug-friendly
1691                 $GLOBALS['wgShowExceptionDetails'] = true;
1692                 // Don't break forms
1693                 $GLOBALS['wgExternalLinkTarget'] = '_blank';
1694
1695                 // Extended debugging
1696                 $GLOBALS['wgShowSQLErrors'] = true;
1697                 $GLOBALS['wgShowDBErrorBacktrace'] = true;
1698
1699                 // Allow multiple ob_flush() calls
1700                 $GLOBALS['wgDisableOutputCompression'] = true;
1701
1702                 // Use a sensible cookie prefix (not my_wiki)
1703                 $GLOBALS['wgCookiePrefix'] = 'mw_installer';
1704
1705                 // Some of the environment checks make shell requests, remove limits
1706                 $GLOBALS['wgMaxShellMemory'] = 0;
1707
1708                 // Override the default CookieSessionProvider with a dummy
1709                 // implementation that won't stomp on PHP's cookies.
1710                 $GLOBALS['wgSessionProviders'] = [
1711                         [
1712                                 'class' => 'InstallerSessionProvider',
1713                                 'args' => [ [
1714                                         'priority' => 1,
1715                                 ] ]
1716                         ]
1717                 ];
1718
1719                 // Don't try to use any object cache for SessionManager either.
1720                 $GLOBALS['wgSessionCacheType'] = CACHE_NONE;
1721         }
1722
1723         /**
1724          * Add an installation step following the given step.
1725          *
1726          * @param callable $callback A valid installation callback array, in this form:
1727          *    [ 'name' => 'some-unique-name', 'callback' => [ $obj, 'function' ] ];
1728          * @param string $findStep The step to find. Omit to put the step at the beginning
1729          */
1730         public function addInstallStep( $callback, $findStep = 'BEGINNING' ) {
1731                 $this->extraInstallSteps[$findStep][] = $callback;
1732         }
1733
1734         /**
1735          * Disable the time limit for execution.
1736          * Some long-running pages (Install, Upgrade) will want to do this
1737          */
1738         protected function disableTimeLimit() {
1739                 MediaWiki\suppressWarnings();
1740                 set_time_limit( 0 );
1741                 MediaWiki\restoreWarnings();
1742         }
1743 }