includes/installer/Installer.php

   1 <?php
   2 /**
   3  * Base code for MediaWiki installer.
   4  *
   5  * DO NOT PATCH THIS FILE IF YOU NEED TO CHANGE INSTALLER BEHAVIOR IN YOUR PACKAGE!
   6  * See mw-config/overrides/README for details.
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License along
  19  * with this program; if not, write to the Free Software Foundation, Inc.,
  20  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  21  * http://www.gnu.org/copyleft/gpl.html
  22  *
  23  * @file
  24  * @ingroup Deployment
  25  */
  26
  27 use MediaWiki\Interwiki\NullInterwikiLookup;
  28 use MediaWiki\MediaWikiServices;
  29 use MediaWiki\Shell\Shell;
  30
  31 /**
  32  * This documentation group collects source code files with deployment functionality.
  33  *
  34  * @defgroup Deployment Deployment
  35  */
  36
  37 /**
  38  * Base installer class.
  39  *
  40  * This class provides the base for installation and update functionality
  41  * for both MediaWiki core and extensions.
  42  *
  43  * @ingroup Deployment
  44  * @since 1.17
  45  */
  46 abstract class Installer {
  47
  48         /**
  49          * The oldest version of PCRE we can support.
  50          *
  51          * Defining this is necessary because PHP may be linked with a system version
  52          * of PCRE, which may be older than that bundled with the minimum PHP version.
  53          */
  54         const MINIMUM_PCRE_VERSION = '7.2';
  55
  56         /**
  57          * @var array
  58          */
  59         protected $settings;
  60
  61         /**
  62          * List of detected DBs, access using getCompiledDBs().
  63          *
  64          * @var array
  65          */
  66         protected $compiledDBs;
  67
  68         /**
  69          * Cached DB installer instances, access using getDBInstaller().
  70          *
  71          * @var array
  72          */
  73         protected $dbInstallers = [];
  74
  75         /**
  76          * Minimum memory size in MB.
  77          *
  78          * @var int
  79          */
  80         protected $minMemorySize = 50;
  81
  82         /**
  83          * Cached Title, used by parse().
  84          *
  85          * @var Title
  86          */
  87         protected $parserTitle;
  88
  89         /**
  90          * Cached ParserOptions, used by parse().
  91          *
  92          * @var ParserOptions
  93          */
  94         protected $parserOptions;
  95
  96         /**
  97          * Known database types. These correspond to the class names <type>Installer,
  98          * and are also MediaWiki database types valid for $wgDBtype.
  99          *
 100          * To add a new type, create a <type>Installer class and a Database<type>
 101          * class, and add a config-type-<type> message to MessagesEn.php.
 102          *
 103          * @var array
 104          */
 105         protected static $dbTypes = [
 106                 'mysql',
 107                 'postgres',
 108                 'sqlite',
 109         ];
 110
 111         /**
 112          * A list of environment check methods called by doEnvironmentChecks().
 113          * These may output warnings using showMessage(), and/or abort the
 114          * installation process by returning false.
 115          *
 116          * For the WebInstaller these are only called on the Welcome page,
 117          * if these methods have side-effects that should affect later page loads
 118          * (as well as the generated stylesheet), use envPreps instead.
 119          *
 120          * @var array
 121          */
 122         protected $envChecks = [
 123                 'envCheckDB',
 124                 'envCheckBrokenXML',
 125                 'envCheckPCRE',
 126                 'envCheckMemory',
 127                 'envCheckCache',
 128                 'envCheckModSecurity',
 129                 'envCheckDiff3',
 130                 'envCheckGraphics',
 131                 'envCheckGit',
 132                 'envCheckServer',
 133                 'envCheckPath',
 134                 'envCheckShellLocale',
 135                 'envCheckUploadsDirectory',
 136                 'envCheckLibicu',
 137                 'envCheckSuhosinMaxValueLength',
 138                 'envCheck64Bit',
 139         ];
 140
 141         /**
 142          * A list of environment preparation methods called by doEnvironmentPreps().
 143          *
 144          * @var array
 145          */
 146         protected $envPreps = [
 147                 'envPrepServer',
 148                 'envPrepPath',
 149         ];
 150
 151         /**
 152          * MediaWiki configuration globals that will eventually be passed through
 153          * to LocalSettings.php. The names only are given here, the defaults
 154          * typically come from DefaultSettings.php.
 155          *
 156          * @var array
 157          */
 158         protected $defaultVarNames = [
 159                 'wgSitename',
 160                 'wgPasswordSender',
 161                 'wgLanguageCode',
 162                 'wgRightsIcon',
 163                 'wgRightsText',
 164                 'wgRightsUrl',
 165                 'wgEnableEmail',
 166                 'wgEnableUserEmail',
 167                 'wgEnotifUserTalk',
 168                 'wgEnotifWatchlist',
 169                 'wgEmailAuthentication',
 170                 'wgDBname',
 171                 'wgDBtype',
 172                 'wgDiff3',
 173                 'wgImageMagickConvertCommand',
 174                 'wgGitBin',
 175                 'IP',
 176                 'wgScriptPath',
 177                 'wgMetaNamespace',
 178                 'wgDeletedDirectory',
 179                 'wgEnableUploads',
 180                 'wgShellLocale',
 181                 'wgSecretKey',
 182                 'wgUseInstantCommons',
 183                 'wgUpgradeKey',
 184                 'wgDefaultSkin',
 185                 'wgPingback',
 186         ];
 187
 188         /**
 189          * Variables that are stored alongside globals, and are used for any
 190          * configuration of the installation process aside from the MediaWiki
 191          * configuration. Map of names to defaults.
 192          *
 193          * @var array
 194          */
 195         protected $internalDefaults = [
 196                 '_UserLang' => 'en',
 197                 '_Environment' => false,
 198                 '_RaiseMemory' => false,
 199                 '_UpgradeDone' => false,
 200                 '_InstallDone' => false,
 201                 '_Caches' => [],
 202                 '_InstallPassword' => '',
 203                 '_SameAccount' => true,
 204                 '_CreateDBAccount' => false,
 205                 '_NamespaceType' => 'site-name',
 206                 '_AdminName' => '', // will be set later, when the user selects language
 207                 '_AdminPassword' => '',
 208                 '_AdminPasswordConfirm' => '',
 209                 '_AdminEmail' => '',
 210                 '_Subscribe' => false,
 211                 '_SkipOptional' => 'continue',
 212                 '_RightsProfile' => 'wiki',
 213                 '_LicenseCode' => 'none',
 214                 '_CCDone' => false,
 215                 '_Extensions' => [],
 216                 '_Skins' => [],
 217                 '_MemCachedServers' => '',
 218                 '_UpgradeKeySupplied' => false,
 219                 '_ExistingDBSettings' => false,
 220
 221                 // $wgLogo is probably wrong (T50084); set something that will work.
 222                 // Single quotes work fine here, as LocalSettingsGenerator outputs this unescaped.
 223                 'wgLogo' => '$wgResourceBasePath/resources/assets/wiki.png',
 224                 'wgAuthenticationTokenVersion' => 1,
 225         ];
 226
 227         /**
 228          * The actual list of installation steps. This will be initialized by getInstallSteps()
 229          *
 230          * @var array
 231          */
 232         private $installSteps = [];
 233
 234         /**
 235          * Extra steps for installation, for things like DatabaseInstallers to modify
 236          *
 237          * @var array
 238          */
 239         protected $extraInstallSteps = [];
 240
 241         /**
 242          * Known object cache types and the functions used to test for their existence.
 243          *
 244          * @var array
 245          */
 246         protected $objectCaches = [
 247                 'apc' => 'apc_fetch',
 248                 'apcu' => 'apcu_fetch',
 249                 'wincache' => 'wincache_ucache_get'
 250         ];
 251
 252         /**
 253          * User rights profiles.
 254          *
 255          * @var array
 256          */
 257         public $rightsProfiles = [
 258                 'wiki' => [],
 259                 'no-anon' => [
 260                         '*' => [ 'edit' => false ]
 261                 ],
 262                 'fishbowl' => [
 263                         '*' => [
 264                                 'createaccount' => false,
 265                                 'edit' => false,
 266                         ],
 267                 ],
 268                 'private' => [
 269                         '*' => [
 270                                 'createaccount' => false,
 271                                 'edit' => false,
 272                                 'read' => false,
 273                         ],
 274                 ],
 275         ];
 276
 277         /**
 278          * License types.
 279          *
 280          * @var array
 281          */
 282         public $licenses = [
 283                 'cc-by' => [
 284                         'url' => 'https://creativecommons.org/licenses/by/4.0/',
 285                         'icon' => '$wgResourceBasePath/resources/assets/licenses/cc-by.png',
 286                 ],
 287                 'cc-by-sa' => [
 288                         'url' => 'https://creativecommons.org/licenses/by-sa/4.0/',
 289                         'icon' => '$wgResourceBasePath/resources/assets/licenses/cc-by-sa.png',
 290                 ],
 291                 'cc-by-nc-sa' => [
 292                         'url' => 'https://creativecommons.org/licenses/by-nc-sa/4.0/',
 293                         'icon' => '$wgResourceBasePath/resources/assets/licenses/cc-by-nc-sa.png',
 294                 ],
 295                 'cc-0' => [
 296                         'url' => 'https://creativecommons.org/publicdomain/zero/1.0/',
 297                         'icon' => '$wgResourceBasePath/resources/assets/licenses/cc-0.png',
 298                 ],
 299                 'gfdl' => [
 300                         'url' => 'https://www.gnu.org/copyleft/fdl.html',
 301                         'icon' => '$wgResourceBasePath/resources/assets/licenses/gnu-fdl.png',
 302                 ],
 303                 'none' => [
 304                         'url' => '',
 305                         'icon' => '',
 306                         'text' => ''
 307                 ],
 308                 'cc-choose' => [
 309                         // Details will be filled in by the selector.
 310                         'url' => '',
 311                         'icon' => '',
 312                         'text' => '',
 313                 ],
 314         ];
 315
 316         /**
 317          * URL to mediawiki-announce subscription
 318          */
 319         protected $mediaWikiAnnounceUrl =
 320                 'https://lists.wikimedia.org/mailman/subscribe/mediawiki-announce';
 321
 322         /**
 323          * Supported language codes for Mailman
 324          */
 325         protected $mediaWikiAnnounceLanguages = [
 326                 'ca', 'cs', 'da', 'de', 'en', 'es', 'et', 'eu', 'fi', 'fr', 'hr', 'hu',
 327                 'it', 'ja', 'ko', 'lt', 'nl', 'no', 'pl', 'pt', 'pt-br', 'ro', 'ru',
 328                 'sl', 'sr', 'sv', 'tr', 'uk'
 329         ];
 330
 331         /**
 332          * UI interface for displaying a short message
 333          * The parameters are like parameters to wfMessage().
 334          * The messages will be in wikitext format, which will be converted to an
 335          * output format such as HTML or text before being sent to the user.
 336          * @param string $msg
 337          * @param mixed ...$params
 338          */
 339         abstract public function showMessage( $msg, ...$params );
 340
 341         /**
 342          * Same as showMessage(), but for displaying errors
 343          * @param string $msg
 344          * @param mixed ...$params
 345          */
 346         abstract public function showError( $msg, ...$params );
 347
 348         /**
 349          * Show a message to the installing user by using a Status object
 350          * @param Status $status
 351          */
 352         abstract public function showStatusMessage( Status $status );
 353
 354         /**
 355          * Constructs a Config object that contains configuration settings that should be
 356          * overwritten for the installation process.
 357          *
 358          * @since 1.27
 359          *
 360          * @param Config $baseConfig
 361          *
 362          * @return Config The config to use during installation.
 363          */
 364         public static function getInstallerConfig( Config $baseConfig ) {
 365                 $configOverrides = new HashConfig();
 366
 367                 // disable (problematic) object cache types explicitly, preserving all other (working) ones
 368                 // bug T113843
 369                 $emptyCache = [ 'class' => EmptyBagOStuff::class ];
 370
 371                 $objectCaches = [
 372                                 CACHE_NONE => $emptyCache,
 373                                 CACHE_DB => $emptyCache,
 374                                 CACHE_ANYTHING => $emptyCache,
 375                                 CACHE_MEMCACHED => $emptyCache,
 376                         ] + $baseConfig->get( 'ObjectCaches' );
 377
 378                 $configOverrides->set( 'ObjectCaches', $objectCaches );
 379
 380                 // Load the installer's i18n.
 381                 $messageDirs = $baseConfig->get( 'MessagesDirs' );
 382                 $messageDirs['MediawikiInstaller'] = __DIR__ . '/i18n';
 383
 384                 $configOverrides->set( 'MessagesDirs', $messageDirs );
 385
 386                 $installerConfig = new MultiConfig( [ $configOverrides, $baseConfig ] );
 387
 388                 // make sure we use the installer config as the main config
 389                 $configRegistry = $baseConfig->get( 'ConfigRegistry' );
 390                 $configRegistry['main'] = function () use ( $installerConfig ) {
 391                         return $installerConfig;
 392                 };
 393
 394                 $configOverrides->set( 'ConfigRegistry', $configRegistry );
 395
 396                 return $installerConfig;
 397         }
 398
 399         /**
 400          * Constructor, always call this from child classes.
 401          */
 402         public function __construct() {
 403                 global $wgMemc, $wgUser, $wgObjectCaches;
 404
 405                 $defaultConfig = new GlobalVarConfig(); // all the stuff from DefaultSettings.php
 406                 $installerConfig = self::getInstallerConfig( $defaultConfig );
 407
 408                 // Reset all services and inject config overrides
 409                 MediaWikiServices::resetGlobalInstance( $installerConfig );
 410
 411                 // Don't attempt to load user language options (T126177)
 412                 // This will be overridden in the web installer with the user-specified language
 413                 RequestContext::getMain()->setLanguage( 'en' );
 414
 415                 // Disable the i18n cache
 416                 // TODO: manage LocalisationCache singleton in MediaWikiServices
 417                 Language::getLocalisationCache()->disableBackend();
 418
 419                 // Disable all global services, since we don't have any configuration yet!
 420                 MediaWikiServices::disableStorageBackend();
 421
 422                 $mwServices = MediaWikiServices::getInstance();
 423                 // Disable object cache (otherwise CACHE_ANYTHING will try CACHE_DB and
 424                 // SqlBagOStuff will then throw since we just disabled wfGetDB)
 425                 $wgObjectCaches = $mwServices->getMainConfig()->get( 'ObjectCaches' );
 426                 $wgMemc = ObjectCache::getInstance( CACHE_NONE );
 427
 428                 // Disable interwiki lookup, to avoid database access during parses
 429                 $mwServices->redefineService( 'InterwikiLookup', function () {
 430                         return new NullInterwikiLookup();
 431                 } );
 432
 433                 // Having a user with id = 0 safeguards us from DB access via User::loadOptions().
 434                 $wgUser = User::newFromId( 0 );
 435                 RequestContext::getMain()->setUser( $wgUser );
 436
 437                 $this->settings = $this->internalDefaults;
 438
 439                 foreach ( $this->defaultVarNames as $var ) {
 440                         $this->settings[$var] = $GLOBALS[$var];
 441                 }
 442
 443                 $this->doEnvironmentPreps();
 444
 445                 $this->compiledDBs = [];
 446                 foreach ( self::getDBTypes() as $type ) {
 447                         $installer = $this->getDBInstaller( $type );
 448
 449                         if ( !$installer->isCompiled() ) {
 450                                 continue;
 451                         }
 452                         $this->compiledDBs[] = $type;
 453                 }
 454
 455                 $this->parserTitle = Title::newFromText( 'Installer' );
 456                 $this->parserOptions = new ParserOptions( $wgUser ); // language will be wrong :(
 457                 $this->parserOptions->setTidy( true );
 458                 // Don't try to access DB before user language is initialised
 459                 $this->setParserLanguage( Language::factory( 'en' ) );
 460         }
 461
 462         /**
 463          * Get a list of known DB types.
 464          *
 465          * @return array
 466          */
 467         public static function getDBTypes() {
 468                 return self::$dbTypes;
 469         }
 470
 471         /**
 472          * Do initial checks of the PHP environment. Set variables according to
 473          * the observed environment.
 474          *
 475          * It's possible that this may be called under the CLI SAPI, not the SAPI
 476          * that the wiki will primarily run under. In that case, the subclass should
 477          * initialise variables such as wgScriptPath, before calling this function.
 478          *
 479          * Under the web subclass, it can already be assumed that PHP 5+ is in use
 480          * and that sessions are working.
 481          *
 482          * @return Status
 483          */
 484         public function doEnvironmentChecks() {
 485                 // Php version has already been checked by entry scripts
 486                 // Show message here for information purposes
 487                 if ( wfIsHHVM() ) {
 488                         $this->showMessage( 'config-env-hhvm', HHVM_VERSION );
 489                 } else {
 490                         $this->showMessage( 'config-env-php', PHP_VERSION );
 491                 }
 492
 493                 $good = true;
 494                 // Must go here because an old version of PCRE can prevent other checks from completing
 495                 $pcreVersion = explode( ' ', PCRE_VERSION, 2 )[0];
 496                 if ( version_compare( $pcreVersion, self::MINIMUM_PCRE_VERSION, '<' ) ) {
 497                         $this->showError( 'config-pcre-old', self::MINIMUM_PCRE_VERSION, $pcreVersion );
 498                         $good = false;
 499                 } else {
 500                         foreach ( $this->envChecks as $check ) {
 501                                 $status = $this->$check();
 502                                 if ( $status === false ) {
 503                                         $good = false;
 504                                 }
 505                         }
 506                 }
 507
 508                 $this->setVar( '_Environment', $good );
 509
 510                 return $good ? Status::newGood() : Status::newFatal( 'config-env-bad' );
 511         }
 512
 513         public function doEnvironmentPreps() {
 514                 foreach ( $this->envPreps as $prep ) {
 515                         $this->$prep();
 516                 }
 517         }
 518
 519         /**
 520          * Set a MW configuration variable, or internal installer configuration variable.
 521          *
 522          * @param string $name
 523          * @param mixed $value
 524          */
 525         public function setVar( $name, $value ) {
 526                 $this->settings[$name] = $value;
 527         }
 528
 529         /**
 530          * Get an MW configuration variable, or internal installer configuration variable.
 531          * The defaults come from $GLOBALS (ultimately DefaultSettings.php).
 532          * Installer variables are typically prefixed by an underscore.
 533          *
 534          * @param string $name
 535          * @param mixed|null $default
 536          *
 537          * @return mixed
 538          */
 539         public function getVar( $name, $default = null ) {
 540                 return $this->settings[$name] ?? $default;
 541         }
 542
 543         /**
 544          * Get a list of DBs supported by current PHP setup
 545          *
 546          * @return array
 547          */
 548         public function getCompiledDBs() {
 549                 return $this->compiledDBs;
 550         }
 551
 552         /**
 553          * Get the DatabaseInstaller class name for this type
 554          *
 555          * @param string $type database type ($wgDBtype)
 556          * @return string Class name
 557          * @since 1.30
 558          */
 559         public static function getDBInstallerClass( $type ) {
 560                 return ucfirst( $type ) . 'Installer';
 561         }
 562
 563         /**
 564          * Get an instance of DatabaseInstaller for the specified DB type.
 565          *
 566          * @param mixed $type DB installer for which is needed, false to use default.
 567          *
 568          * @return DatabaseInstaller
 569          */
 570         public function getDBInstaller( $type = false ) {
 571                 if ( !$type ) {
 572                         $type = $this->getVar( 'wgDBtype' );
 573                 }
 574
 575                 $type = strtolower( $type );
 576
 577                 if ( !isset( $this->dbInstallers[$type] ) ) {
 578                         $class = self::getDBInstallerClass( $type );
 579                         $this->dbInstallers[$type] = new $class( $this );
 580                 }
 581
 582                 return $this->dbInstallers[$type];
 583         }
 584
 585         /**
 586          * Determine if LocalSettings.php exists. If it does, return its variables.
 587          *
 588          * @return array|false
 589          */
 590         public static function getExistingLocalSettings() {
 591                 global $IP;
 592
 593                 // You might be wondering why this is here. Well if you don't do this
 594                 // then some poorly-formed extensions try to call their own classes
 595                 // after immediately registering them. We really need to get extension
 596                 // registration out of the global scope and into a real format.
 597                 // @see https://phabricator.wikimedia.org/T69440
 598                 global $wgAutoloadClasses;
 599                 $wgAutoloadClasses = [];
 600
 601                 // LocalSettings.php should not call functions, except wfLoadSkin/wfLoadExtensions
 602                 // Define the required globals here, to ensure, the functions can do it work correctly.
 603                 // phpcs:ignore MediaWiki.VariableAnalysis.UnusedGlobalVariables
 604                 global $wgExtensionDirectory, $wgStyleDirectory;
 605
 606                 Wikimedia\suppressWarnings();
 607                 $_lsExists = file_exists( "$IP/LocalSettings.php" );
 608                 Wikimedia\restoreWarnings();
 609
 610                 if ( !$_lsExists ) {
 611                         return false;
 612                 }
 613                 unset( $_lsExists );
 614
 615                 require "$IP/includes/DefaultSettings.php";
 616                 require "$IP/LocalSettings.php";
 617
 618                 return get_defined_vars();
 619         }
 620
 621         /**
 622          * Get a fake password for sending back to the user in HTML.
 623          * This is a security mechanism to avoid compromise of the password in the
 624          * event of session ID compromise.
 625          *
 626          * @param string $realPassword
 627          *
 628          * @return string
 629          */
 630         public function getFakePassword( $realPassword ) {
 631                 return str_repeat( '*', strlen( $realPassword ) );
 632         }
 633
 634         /**
 635          * Set a variable which stores a password, except if the new value is a
 636          * fake password in which case leave it as it is.
 637          *
 638          * @param string $name
 639          * @param mixed $value
 640          */
 641         public function setPassword( $name, $value ) {
 642                 if ( !preg_match( '/^\*+$/', $value ) ) {
 643                         $this->setVar( $name, $value );
 644                 }
 645         }
 646
 647         /**
 648          * On POSIX systems return the primary group of the webserver we're running under.
 649          * On other systems just returns null.
 650          *
 651          * This is used to advice the user that he should chgrp his mw-config/data/images directory as the
 652          * webserver user before he can install.
 653          *
 654          * Public because SqliteInstaller needs it, and doesn't subclass Installer.
 655          *
 656          * @return mixed
 657          */
 658         public static function maybeGetWebserverPrimaryGroup() {
 659                 if ( !function_exists( 'posix_getegid' ) || !function_exists( 'posix_getpwuid' ) ) {
 660                         # I don't know this, this isn't UNIX.
 661                         return null;
 662                 }
 663
 664                 # posix_getegid() *not* getmygid() because we want the group of the webserver,
 665                 # not whoever owns the current script.
 666                 $gid = posix_getegid();
 667                 $group = posix_getpwuid( $gid )['name'];
 668
 669                 return $group;
 670         }
 671
 672         /**
 673          * Convert wikitext $text to HTML.
 674          *
 675          * This is potentially error prone since many parser features require a complete
 676          * installed MW database. The solution is to just not use those features when you
 677          * write your messages. This appears to work well enough. Basic formatting and
 678          * external links work just fine.
 679          *
 680          * But in case a translator decides to throw in a "#ifexist" or internal link or
 681          * whatever, this function is guarded to catch the attempted DB access and to present
 682          * some fallback text.
 683          *
 684          * @param string $text
 685          * @param bool $lineStart
 686          * @return string
 687          */
 688         public function parse( $text, $lineStart = false ) {
 689                 $parser = MediaWikiServices::getInstance()->getParser();
 690
 691                 try {
 692                         $out = $parser->parse( $text, $this->parserTitle, $this->parserOptions, $lineStart );
 693                         $html = $out->getText( [
 694                                 'enableSectionEditLinks' => false,
 695                                 'unwrap' => true,
 696                         ] );
 697                         $html = Parser::stripOuterParagraph( $html );
 698                 } catch ( Wikimedia\Services\ServiceDisabledException $e ) {
 699                         $html = '<!--DB access attempted during parse-->  ' . htmlspecialchars( $text );
 700                 }
 701
 702                 return $html;
 703         }
 704
 705         /**
 706          * @return ParserOptions
 707          */
 708         public function getParserOptions() {
 709                 return $this->parserOptions;
 710         }
 711
 712         public function disableLinkPopups() {
 713                 $this->parserOptions->setExternalLinkTarget( false );
 714         }
 715
 716         public function restoreLinkPopups() {
 717                 global $wgExternalLinkTarget;
 718                 $this->parserOptions->setExternalLinkTarget( $wgExternalLinkTarget );
 719         }
 720
 721         /**
 722          * Install step which adds a row to the site_stats table with appropriate
 723          * initial values.
 724          *
 725          * @param DatabaseInstaller $installer
 726          *
 727          * @return Status
 728          */
 729         public function populateSiteStats( DatabaseInstaller $installer ) {
 730                 $status = $installer->getConnection();
 731                 if ( !$status->isOK() ) {
 732                         return $status;
 733                 }
 734                 $status->value->insert(
 735                         'site_stats',
 736                         [
 737                                 'ss_row_id' => 1,
 738                                 'ss_total_edits' => 0,
 739                                 'ss_good_articles' => 0,
 740                                 'ss_total_pages' => 0,
 741                                 'ss_users' => 0,
 742                                 'ss_active_users' => 0,
 743                                 'ss_images' => 0
 744                         ],
 745                         __METHOD__, 'IGNORE'
 746                 );
 747
 748                 return Status::newGood();
 749         }
 750
 751         /**
 752          * Environment check for DB types.
 753          * @return bool
 754          */
 755         protected function envCheckDB() {
 756                 global $wgLang;
 757                 /** @var string|null $dbType The user-specified database type */
 758                 $dbType = $this->getVar( 'wgDBtype' );
 759
 760                 $allNames = [];
 761
 762                 // Messages: config-type-mysql, config-type-postgres, config-type-sqlite
 763                 foreach ( self::getDBTypes() as $name ) {
 764                         $allNames[] = wfMessage( "config-type-$name" )->text();
 765                 }
 766
 767                 $databases = $this->getCompiledDBs();
 768
 769                 $databases = array_flip( $databases );
 770                 $ok = true;
 771                 foreach ( array_keys( $databases ) as $db ) {
 772                         $installer = $this->getDBInstaller( $db );
 773                         $status = $installer->checkPrerequisites();
 774                         if ( !$status->isGood() ) {
 775                                 if ( !$this instanceof WebInstaller && $db === $dbType ) {
 776                                         // Strictly check the key database type instead of just outputting message
 777                                         // Note: No perform this check run from the web installer, since this method always called by
 778                                         // the welcome page under web installation, so $dbType will always be 'mysql'
 779                                         $ok = false;
 780                                 }
 781                                 $this->showStatusMessage( $status );
 782                                 unset( $databases[$db] );
 783                         }
 784                 }
 785                 $databases = array_flip( $databases );
 786                 if ( !$databases ) {
 787                         $this->showError( 'config-no-db', $wgLang->commaList( $allNames ), count( $allNames ) );
 788                         return false;
 789                 }
 790                 return $ok;
 791         }
 792
 793         /**
 794          * Some versions of libxml+PHP break < and > encoding horribly
 795          * @return bool
 796          */
 797         protected function envCheckBrokenXML() {
 798                 $test = new PhpXmlBugTester();
 799                 if ( !$test->ok ) {
 800                         $this->showError( 'config-brokenlibxml' );
 801
 802                         return false;
 803                 }
 804
 805                 return true;
 806         }
 807
 808         /**
 809          * Environment check for the PCRE module.
 810          *
 811          * @note If this check were to fail, the parser would
 812          *   probably throw an exception before the result
 813          *   of this check is shown to the user.
 814          * @return bool
 815          */
 816         protected function envCheckPCRE() {
 817                 Wikimedia\suppressWarnings();
 818                 $regexd = preg_replace( '/[\x{0430}-\x{04FF}]/iu', '', '-АБВГД-' );
 819                 // Need to check for \p support too, as PCRE can be compiled
 820                 // with utf8 support, but not unicode property support.
 821                 // check that \p{Zs} (space separators) matches
 822                 // U+3000 (Ideographic space)
 823                 $regexprop = preg_replace( '/\p{Zs}/u', '', "-\u{3000}-" );
 824                 Wikimedia\restoreWarnings();
 825                 if ( $regexd != '--' || $regexprop != '--' ) {
 826                         $this->showError( 'config-pcre-no-utf8' );
 827
 828                         return false;
 829                 }
 830
 831                 return true;
 832         }
 833
 834         /**
 835          * Environment check for available memory.
 836          * @return bool
 837          */
 838         protected function envCheckMemory() {
 839                 $limit = ini_get( 'memory_limit' );
 840
 841                 if ( !$limit || $limit == -1 ) {
 842                         return true;
 843                 }
 844
 845                 $n = wfShorthandToInteger( $limit );
 846
 847                 if ( $n < $this->minMemorySize * 1024 * 1024 ) {
 848                         $newLimit = "{$this->minMemorySize}M";
 849
 850                         if ( ini_set( "memory_limit", $newLimit ) === false ) {
 851                                 $this->showMessage( 'config-memory-bad', $limit );
 852                         } else {
 853                                 $this->showMessage( 'config-memory-raised', $limit, $newLimit );
 854                                 $this->setVar( '_RaiseMemory', true );
 855                         }
 856                 }
 857
 858                 return true;
 859         }
 860
 861         /**
 862          * Environment check for compiled object cache types.
 863          */
 864         protected function envCheckCache() {
 865                 $caches = [];
 866                 foreach ( $this->objectCaches as $name => $function ) {
 867                         if ( function_exists( $function ) ) {
 868                                 $caches[$name] = true;
 869                         }
 870                 }
 871
 872                 if ( !$caches ) {
 873                         $this->showMessage( 'config-no-cache-apcu' );
 874                 }
 875
 876                 $this->setVar( '_Caches', $caches );
 877         }
 878
 879         /**
 880          * Scare user to death if they have mod_security or mod_security2
 881          * @return bool
 882          */
 883         protected function envCheckModSecurity() {
 884                 if ( self::apacheModulePresent( 'mod_security' )
 885                         || self::apacheModulePresent( 'mod_security2' ) ) {
 886                         $this->showMessage( 'config-mod-security' );
 887                 }
 888
 889                 return true;
 890         }
 891
 892         /**
 893          * Search for GNU diff3.
 894          * @return bool
 895          */
 896         protected function envCheckDiff3() {
 897                 $names = [ "gdiff3", "diff3" ];
 898                 if ( wfIsWindows() ) {
 899                         $names[] = 'diff3.exe';
 900                 }
 901                 $versionInfo = [ '--version', 'GNU diffutils' ];
 902
 903                 $diff3 = ExecutableFinder::findInDefaultPaths( $names, $versionInfo );
 904
 905                 if ( $diff3 ) {
 906                         $this->setVar( 'wgDiff3', $diff3 );
 907                 } else {
 908                         $this->setVar( 'wgDiff3', false );
 909                         $this->showMessage( 'config-diff3-bad' );
 910                 }
 911
 912                 return true;
 913         }
 914
 915         /**
 916          * Environment check for ImageMagick and GD.
 917          * @return bool
 918          */
 919         protected function envCheckGraphics() {
 920                 $names = wfIsWindows() ? 'convert.exe' : 'convert';
 921                 $versionInfo = [ '-version', 'ImageMagick' ];
 922                 $convert = ExecutableFinder::findInDefaultPaths( $names, $versionInfo );
 923
 924                 $this->setVar( 'wgImageMagickConvertCommand', '' );
 925                 if ( $convert ) {
 926                         $this->setVar( 'wgImageMagickConvertCommand', $convert );
 927                         $this->showMessage( 'config-imagemagick', $convert );
 928
 929                         return true;
 930                 } elseif ( function_exists( 'imagejpeg' ) ) {
 931                         $this->showMessage( 'config-gd' );
 932                 } else {
 933                         $this->showMessage( 'config-no-scaling' );
 934                 }
 935
 936                 return true;
 937         }
 938
 939         /**
 940          * Search for git.
 941          *
 942          * @since 1.22
 943          * @return bool
 944          */
 945         protected function envCheckGit() {
 946                 $names = wfIsWindows() ? 'git.exe' : 'git';
 947                 $versionInfo = [ '--version', 'git version' ];
 948
 949                 $git = ExecutableFinder::findInDefaultPaths( $names, $versionInfo );
 950
 951                 if ( $git ) {
 952                         $this->setVar( 'wgGitBin', $git );
 953                         $this->showMessage( 'config-git', $git );
 954                 } else {
 955                         $this->setVar( 'wgGitBin', false );
 956                         $this->showMessage( 'config-git-bad' );
 957                 }
 958
 959                 return true;
 960         }
 961
 962         /**
 963          * Environment check to inform user which server we've assumed.
 964          *
 965          * @return bool
 966          */
 967         protected function envCheckServer() {
 968                 $server = $this->envGetDefaultServer();
 969                 if ( $server !== null ) {
 970                         $this->showMessage( 'config-using-server', $server );
 971                 }
 972                 return true;
 973         }
 974
 975         /**
 976          * Environment check to inform user which paths we've assumed.
 977          *
 978          * @return bool
 979          */
 980         protected function envCheckPath() {
 981                 $this->showMessage(
 982                         'config-using-uri',
 983                         $this->getVar( 'wgServer' ),
 984                         $this->getVar( 'wgScriptPath' )
 985                 );
 986                 return true;
 987         }
 988
 989         /**
 990          * Environment check for preferred locale in shell
 991          * @return bool
 992          */
 993         protected function envCheckShellLocale() {
 994                 $os = php_uname( 's' );
 995                 $supported = [ 'Linux', 'SunOS', 'HP-UX', 'Darwin' ]; # Tested these
 996
 997                 if ( !in_array( $os, $supported ) ) {
 998                         return true;
 999                 }
1000
1001                 if ( Shell::isDisabled() ) {
1002                         return true;
1003                 }
1004
1005                 # Get a list of available locales.
1006                 $result = Shell::command( '/usr/bin/locale', '-a' )
1007                         ->execute();
1008
1009                 if ( $result->getExitCode() != 0 ) {
1010                         return true;
1011                 }
1012
1013                 $lines = $result->getStdout();
1014                 $lines = array_map( 'trim', explode( "\n", $lines ) );
1015                 $candidatesByLocale = [];
1016                 $candidatesByLang = [];
1017                 foreach ( $lines as $line ) {
1018                         if ( $line === '' ) {
1019                                 continue;
1020                         }
1021
1022                         if ( !preg_match( '/^([a-zA-Z]+)(_[a-zA-Z]+|)\.(utf8|UTF-8)(@[a-zA-Z_]*|)$/i', $line, $m ) ) {
1023                                 continue;
1024                         }
1025
1026                         list( , $lang, , , ) = $m;
1027
1028                         $candidatesByLocale[$m[0]] = $m;
1029                         $candidatesByLang[$lang][] = $m;
1030                 }
1031
1032                 # Try the current value of LANG.
1033                 if ( isset( $candidatesByLocale[getenv( 'LANG' )] ) ) {
1034                         $this->setVar( 'wgShellLocale', getenv( 'LANG' ) );
1035
1036                         return true;
1037                 }
1038
1039                 # Try the most common ones.
1040                 $commonLocales = [ 'C.UTF-8', 'en_US.UTF-8', 'en_US.utf8', 'de_DE.UTF-8', 'de_DE.utf8' ];
1041                 foreach ( $commonLocales as $commonLocale ) {
1042                         if ( isset( $candidatesByLocale[$commonLocale] ) ) {
1043                                 $this->setVar( 'wgShellLocale', $commonLocale );
1044
1045                                 return true;
1046                         }
1047                 }
1048
1049                 # Is there an available locale in the Wiki's language?
1050                 $wikiLang = $this->getVar( 'wgLanguageCode' );
1051
1052                 if ( isset( $candidatesByLang[$wikiLang] ) ) {
1053                         $m = reset( $candidatesByLang[$wikiLang] );
1054                         $this->setVar( 'wgShellLocale', $m[0] );
1055
1056                         return true;
1057                 }
1058
1059                 # Are there any at all?
1060                 if ( count( $candidatesByLocale ) ) {
1061                         $m = reset( $candidatesByLocale );
1062                         $this->setVar( 'wgShellLocale', $m[0] );
1063
1064                         return true;
1065                 }
1066
1067                 # Give up.
1068                 return true;
1069         }
1070
1071         /**
1072          * Environment check for the permissions of the uploads directory
1073          * @return bool
1074          */
1075         protected function envCheckUploadsDirectory() {
1076                 global $IP;
1077
1078                 $dir = $IP . '/images/';
1079                 $url = $this->getVar( 'wgServer' ) . $this->getVar( 'wgScriptPath' ) . '/images/';
1080                 $safe = !$this->dirIsExecutable( $dir, $url );
1081
1082                 if ( !$safe ) {
1083                         $this->showMessage( 'config-uploads-not-safe', $dir );
1084                 }
1085
1086                 return true;
1087         }
1088
1089         /**
1090          * Checks if suhosin.get.max_value_length is set, and if so generate
1091          * a warning because it decreases ResourceLoader performance.
1092          * @return bool
1093          */
1094         protected function envCheckSuhosinMaxValueLength() {
1095                 $maxValueLength = ini_get( 'suhosin.get.max_value_length' );
1096                 if ( $maxValueLength > 0 && $maxValueLength < 1024 ) {
1097                         // Only warn if the value is below the sane 1024
1098                         $this->showMessage( 'config-suhosin-max-value-length', $maxValueLength );
1099                 }
1100
1101                 return true;
1102         }
1103
1104         /**
1105          * Checks if we're running on 64 bit or not. 32 bit is becoming increasingly
1106          * hard to support, so let's at least warn people.
1107          *
1108          * @return bool
1109          */
1110         protected function envCheck64Bit() {
1111                 if ( PHP_INT_SIZE == 4 ) {
1112                         $this->showMessage( 'config-using-32bit' );
1113                 }
1114
1115                 return true;
1116         }
1117
1118         /**
1119          * Check the libicu version
1120          */
1121         protected function envCheckLibicu() {
1122                 /**
1123                  * This needs to be updated something that the latest libicu
1124                  * will properly normalize.  This normalization was found at
1125                  * https://www.unicode.org/versions/Unicode5.2.0/#Character_Additions
1126                  * Note that we use the hex representation to create the code
1127                  * points in order to avoid any Unicode-destroying during transit.
1128                  */
1129                 $not_normal_c = "\u{FA6C}";
1130                 $normal_c = "\u{242EE}";
1131
1132                 $useNormalizer = 'php';
1133                 $needsUpdate = false;
1134
1135                 if ( function_exists( 'normalizer_normalize' ) ) {
1136                         $useNormalizer = 'intl';
1137                         $intl = normalizer_normalize( $not_normal_c, Normalizer::FORM_C );
1138                         if ( $intl !== $normal_c ) {
1139                                 $needsUpdate = true;
1140                         }
1141                 }
1142
1143                 // Uses messages 'config-unicode-using-php' and 'config-unicode-using-intl'
1144                 if ( $useNormalizer === 'php' ) {
1145                         $this->showMessage( 'config-unicode-pure-php-warning' );
1146                 } else {
1147                         $this->showMessage( 'config-unicode-using-' . $useNormalizer );
1148                         if ( $needsUpdate ) {
1149                                 $this->showMessage( 'config-unicode-update-warning' );
1150                         }
1151                 }
1152         }
1153
1154         /**
1155          * Environment prep for the server hostname.
1156          */
1157         protected function envPrepServer() {
1158                 $server = $this->envGetDefaultServer();
1159                 if ( $server !== null ) {
1160                         $this->setVar( 'wgServer', $server );
1161                 }
1162         }
1163
1164         /**
1165          * Helper function to be called from envPrepServer()
1166          * @return string
1167          */
1168         abstract protected function envGetDefaultServer();
1169
1170         /**
1171          * Environment prep for setting $IP and $wgScriptPath.
1172          */
1173         protected function envPrepPath() {
1174                 global $IP;
1175                 $IP = dirname( dirname( __DIR__ ) );
1176                 $this->setVar( 'IP', $IP );
1177         }
1178
1179         /**
1180          * Checks if scripts located in the given directory can be executed via the given URL.
1181          *
1182          * Used only by environment checks.
1183          * @param string $dir
1184          * @param string $url
1185          * @return bool|int|string
1186          */
1187         public function dirIsExecutable( $dir, $url ) {
1188                 $scriptTypes = [
1189                         'php' => [
1190                                 "<?php echo 'exec';",
1191                                 "#!/var/env php\n<?php echo 'exec';",
1192                         ],
1193                 ];
1194
1195                 // it would be good to check other popular languages here, but it'll be slow.
1196
1197                 Wikimedia\suppressWarnings();
1198
1199                 foreach ( $scriptTypes as $ext => $contents ) {
1200                         foreach ( $contents as $source ) {
1201                                 $file = 'exectest.' . $ext;
1202
1203                                 if ( !file_put_contents( $dir . $file, $source ) ) {
1204                                         break;
1205                                 }
1206
1207                                 try {
1208                                         $text = MediaWikiServices::getInstance()->getHttpRequestFactory()->
1209                                                 get( $url . $file, [ 'timeout' => 3 ], __METHOD__ );
1210                                 } catch ( Exception $e ) {
1211                                         // HttpRequestFactory::get can throw with allow_url_fopen = false and no curl
1212                                         // extension.
1213                                         $text = null;
1214                                 }
1215                                 unlink( $dir . $file );
1216
1217                                 if ( $text == 'exec' ) {
1218                                         Wikimedia\restoreWarnings();
1219
1220                                         return $ext;
1221                                 }
1222                         }
1223                 }
1224
1225                 Wikimedia\restoreWarnings();
1226
1227                 return false;
1228         }
1229
1230         /**
1231          * Checks for presence of an Apache module. Works only if PHP is running as an Apache module, too.
1232          *
1233          * @param string $moduleName Name of module to check.
1234          * @return bool
1235          */
1236         public static function apacheModulePresent( $moduleName ) {
1237                 if ( function_exists( 'apache_get_modules' ) && in_array( $moduleName, apache_get_modules() ) ) {
1238                         return true;
1239                 }
1240                 // try it the hard way
1241                 ob_start();
1242                 phpinfo( INFO_MODULES );
1243                 $info = ob_get_clean();
1244
1245                 return strpos( $info, $moduleName ) !== false;
1246         }
1247
1248         /**
1249          * ParserOptions are constructed before we determined the language, so fix it
1250          *
1251          * @param Language $lang
1252          */
1253         public function setParserLanguage( $lang ) {
1254                 $this->parserOptions->setTargetLanguage( $lang );
1255                 $this->parserOptions->setUserLang( $lang );
1256         }
1257
1258         /**
1259          * Overridden by WebInstaller to provide lastPage parameters.
1260          * @param string $page
1261          * @return string
1262          */
1263         protected function getDocUrl( $page ) {
1264                 return "{$_SERVER['PHP_SELF']}?page=" . urlencode( $page );
1265         }
1266
1267         /**
1268          * Find extensions or skins in a subdirectory of $IP.
1269          * Returns an array containing the value for 'Name' for each found extension.
1270          *
1271          * @param string $directory Directory to search in, relative to $IP, must be either "extensions"
1272          *     or "skins"
1273          * @return array[][] [ $extName => [ 'screenshots' => [ '...' ] ]
1274          */
1275         public function findExtensions( $directory = 'extensions' ) {
1276                 switch ( $directory ) {
1277                         case 'extensions':
1278                                 return $this->findExtensionsByType( 'extension', 'extensions' );
1279                         case 'skins':
1280                                 return $this->findExtensionsByType( 'skin', 'skins' );
1281                         default:
1282                                 throw new InvalidArgumentException( "Invalid extension type" );
1283                 }
1284         }
1285
1286         /**
1287          * Find extensions or skins, and return an array containing the value for 'Name' for each found
1288          * extension.
1289          *
1290          * @param string $type Either "extension" or "skin"
1291          * @param string $directory Directory to search in, relative to $IP
1292          * @return array [ $extName => [ 'screenshots' => [ '...' ] ]
1293          */
1294         protected function findExtensionsByType( $type = 'extension', $directory = 'extensions' ) {
1295                 if ( $this->getVar( 'IP' ) === null ) {
1296                         return [];
1297                 }
1298
1299                 $extDir = $this->getVar( 'IP' ) . '/' . $directory;
1300                 if ( !is_readable( $extDir ) || !is_dir( $extDir ) ) {
1301                         return [];
1302                 }
1303
1304                 $dh = opendir( $extDir );
1305                 $exts = [];
1306                 while ( ( $file = readdir( $dh ) ) !== false ) {
1307                         if ( !is_dir( "$extDir/$file" ) ) {
1308                                 continue;
1309                         }
1310                         $status = $this->getExtensionInfo( $type, $directory, $file );
1311                         if ( $status->isOK() ) {
1312                                 $exts[$file] = $status->value;
1313                         }
1314                 }
1315                 closedir( $dh );
1316                 uksort( $exts, 'strnatcasecmp' );
1317
1318                 return $exts;
1319         }
1320
1321         /**
1322          * @param string $type Either "extension" or "skin"
1323          * @param string $parentRelPath The parent directory relative to $IP
1324          * @param string $name The extension or skin name
1325          * @return Status An object containing an error list. If there were no errors, an associative
1326          *     array of information about the extension can be found in $status->value.
1327          */
1328         protected function getExtensionInfo( $type, $parentRelPath, $name ) {
1329                 if ( $this->getVar( 'IP' ) === null ) {
1330                         throw new Exception( 'Cannot find extensions since the IP variable is not yet set' );
1331                 }
1332                 if ( $type !== 'extension' && $type !== 'skin' ) {
1333                         throw new InvalidArgumentException( "Invalid extension type" );
1334                 }
1335                 $absDir = $this->getVar( 'IP' ) . "/$parentRelPath/$name";
1336                 $relDir = "../$parentRelPath/$name";
1337                 if ( !is_dir( $absDir ) ) {
1338                         return Status::newFatal( 'config-extension-not-found', $name );
1339                 }
1340                 $jsonFile = $type . '.json';
1341                 $fullJsonFile = "$absDir/$jsonFile";
1342                 $isJson = file_exists( $fullJsonFile );
1343                 $isPhp = false;
1344                 if ( !$isJson ) {
1345                         // Only fallback to PHP file if JSON doesn't exist
1346                         $fullPhpFile = "$absDir/$name.php";
1347                         $isPhp = file_exists( $fullPhpFile );
1348                 }
1349                 if ( !$isJson && !$isPhp ) {
1350                         return Status::newFatal( 'config-extension-not-found', $name );
1351                 }
1352
1353                 // Extension exists. Now see if there are screenshots
1354                 $info = [];
1355                 if ( is_dir( "$absDir/screenshots" ) ) {
1356                         $paths = glob( "$absDir/screenshots/*.png" );
1357                         foreach ( $paths as $path ) {
1358                                 $info['screenshots'][] = str_replace( $absDir, $relDir, $path );
1359                         }
1360                 }
1361
1362                 if ( $isJson ) {
1363                         $jsonStatus = $this->readExtension( $fullJsonFile );
1364                         if ( !$jsonStatus->isOK() ) {
1365                                 return $jsonStatus;
1366                         }
1367                         $info += $jsonStatus->value;
1368                 }
1369
1370                 return Status::newGood( $info );
1371         }
1372
1373         /**
1374          * @param string $fullJsonFile
1375          * @param array $extDeps
1376          * @param array $skinDeps
1377          *
1378          * @return Status On success, an array of extension information is in $status->value. On
1379          *    failure, the Status object will have an error list.
1380          */
1381         private function readExtension( $fullJsonFile, $extDeps = [], $skinDeps = [] ) {
1382                 $load = [
1383                         $fullJsonFile => 1
1384                 ];
1385                 if ( $extDeps ) {
1386                         $extDir = $this->getVar( 'IP' ) . '/extensions';
1387                         foreach ( $extDeps as $dep ) {
1388                                 $fname = "$extDir/$dep/extension.json";
1389                                 if ( !file_exists( $fname ) ) {
1390                                         return Status::newFatal( 'config-extension-not-found', $dep );
1391                                 }
1392                                 $load[$fname] = 1;
1393                         }
1394                 }
1395                 if ( $skinDeps ) {
1396                         $skinDir = $this->getVar( 'IP' ) . '/skins';
1397                         foreach ( $skinDeps as $dep ) {
1398                                 $fname = "$skinDir/$dep/skin.json";
1399                                 if ( !file_exists( $fname ) ) {
1400                                         return Status::newFatal( 'config-extension-not-found', $dep );
1401                                 }
1402                                 $load[$fname] = 1;
1403                         }
1404                 }
1405                 $registry = new ExtensionRegistry();
1406                 try {
1407                         $info = $registry->readFromQueue( $load );
1408                 } catch ( ExtensionDependencyError $e ) {
1409                         if ( $e->incompatibleCore || $e->incompatibleSkins
1410                                 || $e->incompatibleExtensions
1411                         ) {
1412                                 // If something is incompatible with a dependency, we have no real
1413                                 // option besides skipping it
1414                                 return Status::newFatal( 'config-extension-dependency',
1415                                         basename( dirname( $fullJsonFile ) ), $e->getMessage() );
1416                         } elseif ( $e->missingExtensions || $e->missingSkins ) {
1417                                 // There's an extension missing in the dependency tree,
1418                                 // so add those to the dependency list and try again
1419                                 return $this->readExtension(
1420                                         $fullJsonFile,
1421                                         array_merge( $extDeps, $e->missingExtensions ),
1422                                         array_merge( $skinDeps, $e->missingSkins )
1423                                 );
1424                         }
1425                         // Some other kind of dependency error?
1426                         return Status::newFatal( 'config-extension-dependency',
1427                                 basename( dirname( $fullJsonFile ) ), $e->getMessage() );
1428                 }
1429                 $ret = [];
1430                 // The order of credits will be the order of $load,
1431                 // so the first extension is the one we want to load,
1432                 // everything else is a dependency
1433                 $i = 0;
1434                 foreach ( $info['credits'] as $name => $credit ) {
1435                         $i++;
1436                         if ( $i == 1 ) {
1437                                 // Extension we want to load
1438                                 continue;
1439                         }
1440                         $type = basename( $credit['path'] ) === 'skin.json' ? 'skins' : 'extensions';
1441                         $ret['requires'][$type][] = $credit['name'];
1442                 }
1443                 $credits = array_values( $info['credits'] )[0];
1444                 if ( isset( $credits['url'] ) ) {
1445                         $ret['url'] = $credits['url'];
1446                 }
1447                 $ret['type'] = $credits['type'];
1448
1449                 return Status::newGood( $ret );
1450         }
1451
1452         /**
1453          * Returns a default value to be used for $wgDefaultSkin: normally the one set in DefaultSettings,
1454          * but will fall back to another if the default skin is missing and some other one is present
1455          * instead.
1456          *
1457          * @param string[] $skinNames Names of installed skins.
1458          * @return string
1459          */
1460         public function getDefaultSkin( array $skinNames ) {
1461                 $defaultSkin = $GLOBALS['wgDefaultSkin'];
1462                 if ( !$skinNames || in_array( $defaultSkin, $skinNames ) ) {
1463                         return $defaultSkin;
1464                 } else {
1465                         return $skinNames[0];
1466                 }
1467         }
1468
1469         /**
1470          * Installs the auto-detected extensions.
1471          *
1472          * @suppress SecurityCheck-OTHER It thinks $exts/$IP is user controlled but they are not.
1473          * @return Status
1474          */
1475         protected function includeExtensions() {
1476                 global $IP;
1477                 $exts = $this->getVar( '_Extensions' );
1478                 $IP = $this->getVar( 'IP' );
1479
1480                 // Marker for DatabaseUpdater::loadExtensions so we don't
1481                 // double load extensions
1482                 define( 'MW_EXTENSIONS_LOADED', true );
1483
1484                 /**
1485                  * We need to include DefaultSettings before including extensions to avoid
1486                  * warnings about unset variables. However, the only thing we really
1487                  * want here is $wgHooks['LoadExtensionSchemaUpdates']. This won't work
1488                  * if the extension has hidden hook registration in $wgExtensionFunctions,
1489                  * but we're not opening that can of worms
1490                  * @see https://phabricator.wikimedia.org/T28857
1491                  */
1492                 global $wgAutoloadClasses;
1493                 $wgAutoloadClasses = [];
1494                 $queue = [];
1495
1496                 require "$IP/includes/DefaultSettings.php";
1497
1498                 foreach ( $exts as $e ) {
1499                         if ( file_exists( "$IP/extensions/$e/extension.json" ) ) {
1500                                 $queue["$IP/extensions/$e/extension.json"] = 1;
1501                         } else {
1502                                 require_once "$IP/extensions/$e/$e.php";
1503                         }
1504                 }
1505
1506                 $registry = new ExtensionRegistry();
1507                 $data = $registry->readFromQueue( $queue );
1508                 $wgAutoloadClasses += $data['autoload'];
1509
1510                 // @phan-suppress-next-line PhanUndeclaredVariable $wgHooks is set by DefaultSettings
1511                 $hooksWeWant = $wgHooks['LoadExtensionSchemaUpdates'] ?? [];
1512
1513                 if ( isset( $data['globals']['wgHooks']['LoadExtensionSchemaUpdates'] ) ) {
1514                         $hooksWeWant = array_merge_recursive(
1515                                 $hooksWeWant,
1516                                 $data['globals']['wgHooks']['LoadExtensionSchemaUpdates']
1517                         );
1518                 }
1519                 // Unset everyone else's hooks. Lord knows what someone might be doing
1520                 // in ParserFirstCallInit (see T29171)
1521                 $GLOBALS['wgHooks'] = [ 'LoadExtensionSchemaUpdates' => $hooksWeWant ];
1522
1523                 return Status::newGood();
1524         }
1525
1526         /**
1527          * Get an array of install steps. Should always be in the format of
1528          * [
1529          *   'name'     => 'someuniquename',
1530          *   'callback' => [ $obj, 'method' ],
1531          * ]
1532          * There must be a config-install-$name message defined per step, which will
1533          * be shown on install.
1534          *
1535          * @param DatabaseInstaller $installer DatabaseInstaller so we can make callbacks
1536          * @return array
1537          */
1538         protected function getInstallSteps( DatabaseInstaller $installer ) {
1539                 $coreInstallSteps = [
1540                         [ 'name' => 'database', 'callback' => [ $installer, 'setupDatabase' ] ],
1541                         [ 'name' => 'tables', 'callback' => [ $installer, 'createTables' ] ],
1542                         [ 'name' => 'interwiki', 'callback' => [ $installer, 'populateInterwikiTable' ] ],
1543                         [ 'name' => 'stats', 'callback' => [ $this, 'populateSiteStats' ] ],
1544                         [ 'name' => 'keys', 'callback' => [ $this, 'generateKeys' ] ],
1545                         [ 'name' => 'updates', 'callback' => [ $installer, 'insertUpdateKeys' ] ],
1546                         [ 'name' => 'sysop', 'callback' => [ $this, 'createSysop' ] ],
1547                         [ 'name' => 'mainpage', 'callback' => [ $this, 'createMainpage' ] ],
1548                 ];
1549
1550                 // Build the array of install steps starting from the core install list,
1551                 // then adding any callbacks that wanted to attach after a given step
1552                 foreach ( $coreInstallSteps as $step ) {
1553                         $this->installSteps[] = $step;
1554                         if ( isset( $this->extraInstallSteps[$step['name']] ) ) {
1555                                 $this->installSteps = array_merge(
1556                                         $this->installSteps,
1557                                         $this->extraInstallSteps[$step['name']]
1558                                 );
1559                         }
1560                 }
1561
1562                 // Prepend any steps that want to be at the beginning
1563                 if ( isset( $this->extraInstallSteps['BEGINNING'] ) ) {
1564                         $this->installSteps = array_merge(
1565                                 $this->extraInstallSteps['BEGINNING'],
1566                                 $this->installSteps
1567                         );
1568                 }
1569
1570                 // Extensions should always go first, chance to tie into hooks and such
1571                 if ( count( $this->getVar( '_Extensions' ) ) ) {
1572                         array_unshift( $this->installSteps,
1573                                 [ 'name' => 'extensions', 'callback' => [ $this, 'includeExtensions' ] ]
1574                         );
1575                         $this->installSteps[] = [
1576                                 'name' => 'extension-tables',
1577                                 'callback' => [ $installer, 'createExtensionTables' ]
1578                         ];
1579                 }
1580
1581                 return $this->installSteps;
1582         }
1583
1584         /**
1585          * Actually perform the installation.
1586          *
1587          * @param callable $startCB A callback array for the beginning of each step
1588          * @param callable $endCB A callback array for the end of each step
1589          *
1590          * @return Status[] Array of Status objects
1591          */
1592         public function performInstallation( $startCB, $endCB ) {
1593                 $installResults = [];
1594                 $installer = $this->getDBInstaller();
1595                 $installer->preInstall();
1596                 $steps = $this->getInstallSteps( $installer );
1597                 foreach ( $steps as $stepObj ) {
1598                         $name = $stepObj['name'];
1599                         call_user_func_array( $startCB, [ $name ] );
1600
1601                         // Perform the callback step
1602                         $status = call_user_func( $stepObj['callback'], $installer );
1603
1604                         // Output and save the results
1605                         call_user_func( $endCB, $name, $status );
1606                         $installResults[$name] = $status;
1607
1608                         // If we've hit some sort of fatal, we need to bail.
1609                         // Callback already had a chance to do output above.
1610                         if ( !$status->isOK() ) {
1611                                 break;
1612                         }
1613                 }
1614                 if ( $status->isOK() ) {
1615                         $this->showMessage(
1616                                 'config-install-db-success'
1617                         );
1618                         $this->setVar( '_InstallDone', true );
1619                 }
1620
1621                 return $installResults;
1622         }
1623
1624         /**
1625          * Generate $wgSecretKey. Will warn if we had to use an insecure random source.
1626          *
1627          * @return Status
1628          */
1629         public function generateKeys() {
1630                 $keys = [ 'wgSecretKey' => 64 ];
1631                 if ( strval( $this->getVar( 'wgUpgradeKey' ) ) === '' ) {
1632                         $keys['wgUpgradeKey'] = 16;
1633                 }
1634
1635                 return $this->doGenerateKeys( $keys );
1636         }
1637
1638         /**
1639          * Generate a secret value for variables using a secure generator.
1640          *
1641          * @param array $keys
1642          * @return Status
1643          */
1644         protected function doGenerateKeys( $keys ) {
1645                 $status = Status::newGood();
1646
1647                 foreach ( $keys as $name => $length ) {
1648                         $secretKey = MWCryptRand::generateHex( $length );
1649                         $this->setVar( $name, $secretKey );
1650                 }
1651
1652                 return $status;
1653         }
1654
1655         /**
1656          * Create the first user account, grant it sysop, bureaucrat and interface-admin rights
1657          *
1658          * @return Status
1659          */
1660         protected function createSysop() {
1661                 $name = $this->getVar( '_AdminName' );
1662                 $user = User::newFromName( $name );
1663
1664                 if ( !$user ) {
1665                         // We should've validated this earlier anyway!
1666                         return Status::newFatal( 'config-admin-error-user', $name );
1667                 }
1668
1669                 if ( $user->idForName() == 0 ) {
1670                         $user->addToDatabase();
1671
1672                         try {
1673                                 $user->setPassword( $this->getVar( '_AdminPassword' ) );
1674                         } catch ( PasswordError $pwe ) {
1675                                 return Status::newFatal( 'config-admin-error-password', $name, $pwe->getMessage() );
1676                         }
1677
1678                         $user->addGroup( 'sysop' );
1679                         $user->addGroup( 'bureaucrat' );
1680                         $user->addGroup( 'interface-admin' );
1681                         if ( $this->getVar( '_AdminEmail' ) ) {
1682                                 $user->setEmail( $this->getVar( '_AdminEmail' ) );
1683                         }
1684                         $user->saveSettings();
1685
1686                         // Update user count
1687                         $ssUpdate = SiteStatsUpdate::factory( [ 'users' => 1 ] );
1688                         $ssUpdate->doUpdate();
1689                 }
1690                 $status = Status::newGood();
1691
1692                 if ( $this->getVar( '_Subscribe' ) && $this->getVar( '_AdminEmail' ) ) {
1693                         $this->subscribeToMediaWikiAnnounce( $status );
1694                 }
1695
1696                 return $status;
1697         }
1698
1699         /**
1700          * @param Status $s
1701          */
1702         private function subscribeToMediaWikiAnnounce( Status $s ) {
1703                 $params = [
1704                         'email' => $this->getVar( '_AdminEmail' ),
1705                         'language' => 'en',
1706                         'digest' => 0
1707                 ];
1708
1709                 // Mailman doesn't support as many languages as we do, so check to make
1710                 // sure their selected language is available
1711                 $myLang = $this->getVar( '_UserLang' );
1712                 if ( in_array( $myLang, $this->mediaWikiAnnounceLanguages ) ) {
1713                         $myLang = $myLang == 'pt-br' ? 'pt_BR' : $myLang; // rewrite to Mailman's pt_BR
1714                         $params['language'] = $myLang;
1715                 }
1716
1717                 if ( MWHttpRequest::canMakeRequests() ) {
1718                         $res = MWHttpRequest::factory( $this->mediaWikiAnnounceUrl,
1719                                 [ 'method' => 'POST', 'postData' => $params ], __METHOD__ )->execute();
1720                         if ( !$res->isOK() ) {
1721                                 $s->warning( 'config-install-subscribe-fail', $res->getMessage() );
1722                         }
1723                 } else {
1724                         $s->warning( 'config-install-subscribe-notpossible' );
1725                 }
1726         }
1727
1728         /**
1729          * Insert Main Page with default content.
1730          *
1731          * @param DatabaseInstaller $installer
1732          * @return Status
1733          */
1734         protected function createMainpage( DatabaseInstaller $installer ) {
1735                 $status = Status::newGood();
1736                 $title = Title::newMainPage();
1737                 if ( $title->exists() ) {
1738                         $status->warning( 'config-install-mainpage-exists' );
1739                         return $status;
1740                 }
1741                 try {
1742                         $page = WikiPage::factory( $title );
1743                         $content = new WikitextContent(
1744                                 wfMessage( 'mainpagetext' )->inContentLanguage()->text() . "\n\n" .
1745                                 wfMessage( 'mainpagedocfooter' )->inContentLanguage()->text()
1746                         );
1747
1748                         $status = $page->doEditContent( $content,
1749                                 '',
1750                                 EDIT_NEW,
1751                                 false,
1752                                 User::newFromName( 'MediaWiki default' )
1753                         );
1754                 } catch ( Exception $e ) {
1755                         // using raw, because $wgShowExceptionDetails can not be set yet
1756                         $status->fatal( 'config-install-mainpage-failed', $e->getMessage() );
1757                 }
1758
1759                 return $status;
1760         }
1761
1762         /**
1763          * Override the necessary bits of the config to run an installation.
1764          */
1765         public static function overrideConfig() {
1766                 // Use PHP's built-in session handling, since MediaWiki's
1767                 // SessionHandler can't work before we have an object cache set up.
1768                 if ( !defined( 'MW_NO_SESSION_HANDLER' ) ) {
1769                         define( 'MW_NO_SESSION_HANDLER', 1 );
1770                 }
1771
1772                 // Don't access the database
1773                 $GLOBALS['wgUseDatabaseMessages'] = false;
1774                 // Don't cache langconv tables
1775                 $GLOBALS['wgLanguageConverterCacheType'] = CACHE_NONE;
1776                 // Debug-friendly
1777                 $GLOBALS['wgShowExceptionDetails'] = true;
1778                 $GLOBALS['wgShowHostnames'] = true;
1779                 // Don't break forms
1780                 $GLOBALS['wgExternalLinkTarget'] = '_blank';
1781
1782                 // Allow multiple ob_flush() calls
1783                 $GLOBALS['wgDisableOutputCompression'] = true;
1784
1785                 // Use a sensible cookie prefix (not my_wiki)
1786                 $GLOBALS['wgCookiePrefix'] = 'mw_installer';
1787
1788                 // Some of the environment checks make shell requests, remove limits
1789                 $GLOBALS['wgMaxShellMemory'] = 0;
1790
1791                 // Override the default CookieSessionProvider with a dummy
1792                 // implementation that won't stomp on PHP's cookies.
1793                 $GLOBALS['wgSessionProviders'] = [
1794                         [
1795                                 'class' => InstallerSessionProvider::class,
1796                                 'args' => [ [
1797                                         'priority' => 1,
1798                                 ] ]
1799                         ]
1800                 ];
1801
1802                 // Don't try to use any object cache for SessionManager either.
1803                 $GLOBALS['wgSessionCacheType'] = CACHE_NONE;
1804         }
1805
1806         /**
1807          * Add an installation step following the given step.
1808          *
1809          * @param array $callback A valid installation callback array, in this form:
1810          *    [ 'name' => 'some-unique-name', 'callback' => [ $obj, 'function' ] ];
1811          * @param string $findStep The step to find. Omit to put the step at the beginning
1812          */
1813         public function addInstallStep( $callback, $findStep = 'BEGINNING' ) {
1814                 $this->extraInstallSteps[$findStep][] = $callback;
1815         }
1816
1817         /**
1818          * Disable the time limit for execution.
1819          * Some long-running pages (Install, Upgrade) will want to do this
1820          */
1821         protected function disableTimeLimit() {
1822                 Wikimedia\suppressWarnings();
1823                 set_time_limit( 0 );
1824                 Wikimedia\restoreWarnings();
1825         }
1826 }