includes/installer/Installer.php

   1 <?php
   2 /**
   3  * Base code for MediaWiki installer.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  * http://www.gnu.org/copyleft/gpl.html
  19  *
  20  * @file
  21  * @ingroup Deployment
  22  */
  23
  24 /**
  25  * This documentation group collects source code files with deployment functionality.
  26  *
  27  * @defgroup Deployment Deployment
  28  */
  29
  30 /**
  31  * Base installer class.
  32  *
  33  * This class provides the base for installation and update functionality
  34  * for both MediaWiki core and extensions.
  35  *
  36  * @ingroup Deployment
  37  * @since 1.17
  38  */
  39 abstract class Installer {
  40
  41         /**
  42          * The oldest version of PCRE we can support.
  43          *
  44          * Defining this is necessary because PHP may be linked with a system version
  45          * of PCRE, which may be older than that bundled with the minimum PHP version.
  46          */
  47         const MINIMUM_PCRE_VERSION = '7.2';
  48
  49         /**
  50          * @var array
  51          */
  52         protected $settings;
  53
  54         /**
  55          * List of detected DBs, access using getCompiledDBs().
  56          *
  57          * @var array
  58          */
  59         protected $compiledDBs;
  60
  61         /**
  62          * Cached DB installer instances, access using getDBInstaller().
  63          *
  64          * @var array
  65          */
  66         protected $dbInstallers = [];
  67
  68         /**
  69          * Minimum memory size in MB.
  70          *
  71          * @var int
  72          */
  73         protected $minMemorySize = 50;
  74
  75         /**
  76          * Cached Title, used by parse().
  77          *
  78          * @var Title
  79          */
  80         protected $parserTitle;
  81
  82         /**
  83          * Cached ParserOptions, used by parse().
  84          *
  85          * @var ParserOptions
  86          */
  87         protected $parserOptions;
  88
  89         /**
  90          * Known database types. These correspond to the class names <type>Installer,
  91          * and are also MediaWiki database types valid for $wgDBtype.
  92          *
  93          * To add a new type, create a <type>Installer class and a Database<type>
  94          * class, and add a config-type-<type> message to MessagesEn.php.
  95          *
  96          * @var array
  97          */
  98         protected static $dbTypes = [
  99                 'mysql',
 100                 'postgres',
 101                 'oracle',
 102                 'mssql',
 103                 'sqlite',
 104         ];
 105
 106         /**
 107          * A list of environment check methods called by doEnvironmentChecks().
 108          * These may output warnings using showMessage(), and/or abort the
 109          * installation process by returning false.
 110          *
 111          * For the WebInstaller these are only called on the Welcome page,
 112          * if these methods have side-effects that should affect later page loads
 113          * (as well as the generated stylesheet), use envPreps instead.
 114          *
 115          * @var array
 116          */
 117         protected $envChecks = [
 118                 'envCheckDB',
 119                 'envCheckBrokenXML',
 120                 'envCheckMbstring',
 121                 'envCheckXML',
 122                 'envCheckPCRE',
 123                 'envCheckMemory',
 124                 'envCheckCache',
 125                 'envCheckModSecurity',
 126                 'envCheckDiff3',
 127                 'envCheckGraphics',
 128                 'envCheckGit',
 129                 'envCheckServer',
 130                 'envCheckPath',
 131                 'envCheckShellLocale',
 132                 'envCheckUploadsDirectory',
 133                 'envCheckLibicu',
 134                 'envCheckSuhosinMaxValueLength',
 135                 'envCheckCtype',
 136                 'envCheckIconv',
 137                 'envCheckJSON',
 138         ];
 139
 140         /**
 141          * A list of environment preparation methods called by doEnvironmentPreps().
 142          *
 143          * @var array
 144          */
 145         protected $envPreps = [
 146                 'envPrepServer',
 147                 'envPrepPath',
 148         ];
 149
 150         /**
 151          * MediaWiki configuration globals that will eventually be passed through
 152          * to LocalSettings.php. The names only are given here, the defaults
 153          * typically come from DefaultSettings.php.
 154          *
 155          * @var array
 156          */
 157         protected $defaultVarNames = [
 158                 'wgSitename',
 159                 'wgPasswordSender',
 160                 'wgLanguageCode',
 161                 'wgRightsIcon',
 162                 'wgRightsText',
 163                 'wgRightsUrl',
 164                 'wgEnableEmail',
 165                 'wgEnableUserEmail',
 166                 'wgEnotifUserTalk',
 167                 'wgEnotifWatchlist',
 168                 'wgEmailAuthentication',
 169                 'wgDBname',
 170                 'wgDBtype',
 171                 'wgDiff3',
 172                 'wgImageMagickConvertCommand',
 173                 'wgGitBin',
 174                 'IP',
 175                 'wgScriptPath',
 176                 'wgMetaNamespace',
 177                 'wgDeletedDirectory',
 178                 'wgEnableUploads',
 179                 'wgShellLocale',
 180                 'wgSecretKey',
 181                 'wgUseInstantCommons',
 182                 'wgUpgradeKey',
 183                 'wgDefaultSkin',
 184         ];
 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' => '$wgResourceBasePath/resources/assets/licenses/cc-0.png',
 296                 ],
 297                 'pd' => [
 298                         'url' => '',
 299                         'icon' => '$wgResourceBasePath/resources/assets/licenses/public-domain.png',
 300                 ],
 301                 'gfdl' => [
 302                         'url' => 'https://www.gnu.org/copyleft/fdl.html',
 303                         'icon' => '$wgResourceBasePath/resources/assets/licenses/gnu-fdl.png',
 304                 ],
 305                 'none' => [
 306                         'url' => '',
 307                         'icon' => '',
 308                         'text' => ''
 309                 ],
 310                 'cc-choose' => [
 311                         // Details will be filled in by the selector.
 312                         'url' => '',
 313                         'icon' => '',
 314                         'text' => '',
 315                 ],
 316         ];
 317
 318         /**
 319          * URL to mediawiki-announce subscription
 320          */
 321         protected $mediaWikiAnnounceUrl =
 322                 'https://lists.wikimedia.org/mailman/subscribe/mediawiki-announce';
 323
 324         /**
 325          * Supported language codes for Mailman
 326          */
 327         protected $mediaWikiAnnounceLanguages = [
 328                 'ca', 'cs', 'da', 'de', 'en', 'es', 'et', 'eu', 'fi', 'fr', 'hr', 'hu',
 329                 'it', 'ja', 'ko', 'lt', 'nl', 'no', 'pl', 'pt', 'pt-br', 'ro', 'ru',
 330                 'sl', 'sr', 'sv', 'tr', 'uk'
 331         ];
 332
 333         /**
 334          * UI interface for displaying a short message
 335          * The parameters are like parameters to wfMessage().
 336          * The messages will be in wikitext format, which will be converted to an
 337          * output format such as HTML or text before being sent to the user.
 338          * @param string $msg
 339          */
 340         abstract public function showMessage( $msg /*, ... */ );
 341
 342         /**
 343          * Same as showMessage(), but for displaying errors
 344          * @param string $msg
 345          */
 346         abstract public function showError( $msg /*, ... */ );
 347
 348         /**
 349          * Show a message to the installing user by using a Status object
 350          * @param Status $status
 351          */
 352         abstract public function showStatusMessage( Status $status );
 353
 354         /**
 355          * Constructor, always call this from child classes.
 356          */
 357         public function __construct() {
 358                 global $wgMessagesDirs, $wgUser;
 359
 360                 // Don't attempt to load user language options (T126177)
 361                 // This will be overridden in the web installer with the user-specified language
 362                 RequestContext::getMain()->setLanguage( 'en' );
 363
 364                 // Disable the i18n cache
 365                 Language::getLocalisationCache()->disableBackend();
 366                 // Disable LoadBalancer and wfGetDB etc.
 367                 LBFactory::disableBackend();
 368
 369                 // Disable object cache (otherwise CACHE_ANYTHING will try CACHE_DB and
 370                 // SqlBagOStuff will then throw since we just disabled wfGetDB)
 371                 $GLOBALS['wgMemc'] = new EmptyBagOStuff;
 372                 ObjectCache::clear();
 373                 $emptyCache = [ 'class' => 'EmptyBagOStuff' ];
 374                 // disable (problematic) object cache types explicitly, preserving all other (working) ones
 375                 // bug T113843
 376                 $GLOBALS['wgObjectCaches'] = [
 377                         CACHE_NONE => $emptyCache,
 378                         CACHE_DB => $emptyCache,
 379                         CACHE_ANYTHING => $emptyCache,
 380                         CACHE_MEMCACHED => $emptyCache,
 381                 ] + $GLOBALS['wgObjectCaches'];
 382
 383                 // Load the installer's i18n.
 384                 $wgMessagesDirs['MediawikiInstaller'] = __DIR__ . '/i18n';
 385
 386                 // Having a user with id = 0 safeguards us from DB access via User::loadOptions().
 387                 $wgUser = User::newFromId( 0 );
 388                 RequestContext::getMain()->setUser( $wgUser );
 389
 390                 $this->settings = $this->internalDefaults;
 391
 392                 foreach ( $this->defaultVarNames as $var ) {
 393                         $this->settings[$var] = $GLOBALS[$var];
 394                 }
 395
 396                 $this->doEnvironmentPreps();
 397
 398                 $this->compiledDBs = [];
 399                 foreach ( self::getDBTypes() as $type ) {
 400                         $installer = $this->getDBInstaller( $type );
 401
 402                         if ( !$installer->isCompiled() ) {
 403                                 continue;
 404                         }
 405                         $this->compiledDBs[] = $type;
 406                 }
 407
 408                 $this->parserTitle = Title::newFromText( 'Installer' );
 409                 $this->parserOptions = new ParserOptions( $wgUser ); // language will be wrong :(
 410                 $this->parserOptions->setEditSection( false );
 411         }
 412
 413         /**
 414          * Get a list of known DB types.
 415          *
 416          * @return array
 417          */
 418         public static function getDBTypes() {
 419                 return self::$dbTypes;
 420         }
 421
 422         /**
 423          * Do initial checks of the PHP environment. Set variables according to
 424          * the observed environment.
 425          *
 426          * It's possible that this may be called under the CLI SAPI, not the SAPI
 427          * that the wiki will primarily run under. In that case, the subclass should
 428          * initialise variables such as wgScriptPath, before calling this function.
 429          *
 430          * Under the web subclass, it can already be assumed that PHP 5+ is in use
 431          * and that sessions are working.
 432          *
 433          * @return Status
 434          */
 435         public function doEnvironmentChecks() {
 436                 // Php version has already been checked by entry scripts
 437                 // Show message here for information purposes
 438                 if ( wfIsHHVM() ) {
 439                         $this->showMessage( 'config-env-hhvm', HHVM_VERSION );
 440                 } else {
 441                         $this->showMessage( 'config-env-php', PHP_VERSION );
 442                 }
 443
 444                 $good = true;
 445                 // Must go here because an old version of PCRE can prevent other checks from completing
 446                 list( $pcreVersion ) = explode( ' ', PCRE_VERSION, 2 );
 447                 if ( version_compare( $pcreVersion, self::MINIMUM_PCRE_VERSION, '<' ) ) {
 448                         $this->showError( 'config-pcre-old', self::MINIMUM_PCRE_VERSION, $pcreVersion );
 449                         $good = false;
 450                 } else {
 451                         foreach ( $this->envChecks as $check ) {
 452                                 $status = $this->$check();
 453                                 if ( $status === false ) {
 454                                         $good = false;
 455                                 }
 456                         }
 457                 }
 458
 459                 $this->setVar( '_Environment', $good );
 460
 461                 return $good ? Status::newGood() : Status::newFatal( 'config-env-bad' );
 462         }
 463
 464         public function doEnvironmentPreps() {
 465                 foreach ( $this->envPreps as $prep ) {
 466                         $this->$prep();
 467                 }
 468         }
 469
 470         /**
 471          * Set a MW configuration variable, or internal installer configuration variable.
 472          *
 473          * @param string $name
 474          * @param mixed $value
 475          */
 476         public function setVar( $name, $value ) {
 477                 $this->settings[$name] = $value;
 478         }
 479
 480         /**
 481          * Get an MW configuration variable, or internal installer configuration variable.
 482          * The defaults come from $GLOBALS (ultimately DefaultSettings.php).
 483          * Installer variables are typically prefixed by an underscore.
 484          *
 485          * @param string $name
 486          * @param mixed $default
 487          *
 488          * @return mixed
 489          */
 490         public function getVar( $name, $default = null ) {
 491                 if ( !isset( $this->settings[$name] ) ) {
 492                         return $default;
 493                 } else {
 494                         return $this->settings[$name];
 495                 }
 496         }
 497
 498         /**
 499          * Get a list of DBs supported by current PHP setup
 500          *
 501          * @return array
 502          */
 503         public function getCompiledDBs() {
 504                 return $this->compiledDBs;
 505         }
 506
 507         /**
 508          * Get an instance of DatabaseInstaller for the specified DB type.
 509          *
 510          * @param mixed $type DB installer for which is needed, false to use default.
 511          *
 512          * @return DatabaseInstaller
 513          */
 514         public function getDBInstaller( $type = false ) {
 515                 if ( !$type ) {
 516                         $type = $this->getVar( 'wgDBtype' );
 517                 }
 518
 519                 $type = strtolower( $type );
 520
 521                 if ( !isset( $this->dbInstallers[$type] ) ) {
 522                         $class = ucfirst( $type ) . 'Installer';
 523                         $this->dbInstallers[$type] = new $class( $this );
 524                 }
 525
 526                 return $this->dbInstallers[$type];
 527         }
 528
 529         /**
 530          * Determine if LocalSettings.php exists. If it does, return its variables.
 531          *
 532          * @return array
 533          */
 534         public static function getExistingLocalSettings() {
 535                 global $IP;
 536
 537                 // You might be wondering why this is here. Well if you don't do this
 538                 // then some poorly-formed extensions try to call their own classes
 539                 // after immediately registering them. We really need to get extension
 540                 // registration out of the global scope and into a real format.
 541                 // @see https://phabricator.wikimedia.org/T69440
 542                 global $wgAutoloadClasses;
 543                 $wgAutoloadClasses = [];
 544
 545                 // @codingStandardsIgnoreStart
 546                 // LocalSettings.php should not call functions, except wfLoadSkin/wfLoadExtensions
 547                 // Define the required globals here, to ensure, the functions can do it work correctly.
 548                 global $wgExtensionDirectory, $wgStyleDirectory;
 549                 // @codingStandardsIgnoreEnd
 550
 551                 MediaWiki\suppressWarnings();
 552                 $_lsExists = file_exists( "$IP/LocalSettings.php" );
 553                 MediaWiki\restoreWarnings();
 554
 555                 if ( !$_lsExists ) {
 556                         return false;
 557                 }
 558                 unset( $_lsExists );
 559
 560                 require "$IP/includes/DefaultSettings.php";
 561                 require "$IP/LocalSettings.php";
 562
 563                 return get_defined_vars();
 564         }
 565
 566         /**
 567          * Get a fake password for sending back to the user in HTML.
 568          * This is a security mechanism to avoid compromise of the password in the
 569          * event of session ID compromise.
 570          *
 571          * @param string $realPassword
 572          *
 573          * @return string
 574          */
 575         public function getFakePassword( $realPassword ) {
 576                 return str_repeat( '*', strlen( $realPassword ) );
 577         }
 578
 579         /**
 580          * Set a variable which stores a password, except if the new value is a
 581          * fake password in which case leave it as it is.
 582          *
 583          * @param string $name
 584          * @param mixed $value
 585          */
 586         public function setPassword( $name, $value ) {
 587                 if ( !preg_match( '/^\*+$/', $value ) ) {
 588                         $this->setVar( $name, $value );
 589                 }
 590         }
 591
 592         /**
 593          * On POSIX systems return the primary group of the webserver we're running under.
 594          * On other systems just returns null.
 595          *
 596          * This is used to advice the user that he should chgrp his mw-config/data/images directory as the
 597          * webserver user before he can install.
 598          *
 599          * Public because SqliteInstaller needs it, and doesn't subclass Installer.
 600          *
 601          * @return mixed
 602          */
 603         public static function maybeGetWebserverPrimaryGroup() {
 604                 if ( !function_exists( 'posix_getegid' ) || !function_exists( 'posix_getpwuid' ) ) {
 605                         # I don't know this, this isn't UNIX.
 606                         return null;
 607                 }
 608
 609                 # posix_getegid() *not* getmygid() because we want the group of the webserver,
 610                 # not whoever owns the current script.
 611                 $gid = posix_getegid();
 612                 $getpwuid = posix_getpwuid( $gid );
 613                 $group = $getpwuid['name'];
 614
 615                 return $group;
 616         }
 617
 618         /**
 619          * Convert wikitext $text to HTML.
 620          *
 621          * This is potentially error prone since many parser features require a complete
 622          * installed MW database. The solution is to just not use those features when you
 623          * write your messages. This appears to work well enough. Basic formatting and
 624          * external links work just fine.
 625          *
 626          * But in case a translator decides to throw in a "#ifexist" or internal link or
 627          * whatever, this function is guarded to catch the attempted DB access and to present
 628          * some fallback text.
 629          *
 630          * @param string $text
 631          * @param bool $lineStart
 632          * @return string
 633          */
 634         public function parse( $text, $lineStart = false ) {
 635                 global $wgParser;
 636
 637                 try {
 638                         $out = $wgParser->parse( $text, $this->parserTitle, $this->parserOptions, $lineStart );
 639                         $html = $out->getText();
 640                 } catch ( DBAccessError $e ) {
 641                         $html = '<!--DB access attempted during parse-->  ' . htmlspecialchars( $text );
 642
 643                         if ( !empty( $this->debug ) ) {
 644                                 $html .= "<!--\n" . $e->getTraceAsString() . "\n-->";
 645                         }
 646                 }
 647
 648                 return $html;
 649         }
 650
 651         /**
 652          * @return ParserOptions
 653          */
 654         public function getParserOptions() {
 655                 return $this->parserOptions;
 656         }
 657
 658         public function disableLinkPopups() {
 659                 $this->parserOptions->setExternalLinkTarget( false );
 660         }
 661
 662         public function restoreLinkPopups() {
 663                 global $wgExternalLinkTarget;
 664                 $this->parserOptions->setExternalLinkTarget( $wgExternalLinkTarget );
 665         }
 666
 667         /**
 668          * Install step which adds a row to the site_stats table with appropriate
 669          * initial values.
 670          *
 671          * @param DatabaseInstaller $installer
 672          *
 673          * @return Status
 674          */
 675         public function populateSiteStats( DatabaseInstaller $installer ) {
 676                 $status = $installer->getConnection();
 677                 if ( !$status->isOK() ) {
 678                         return $status;
 679                 }
 680                 $status->value->insert(
 681                         'site_stats',
 682                         [
 683                                 'ss_row_id' => 1,
 684                                 'ss_total_edits' => 0,
 685                                 'ss_good_articles' => 0,
 686                                 'ss_total_pages' => 0,
 687                                 'ss_users' => 0,
 688                                 'ss_images' => 0
 689                         ],
 690                         __METHOD__, 'IGNORE'
 691                 );
 692
 693                 return Status::newGood();
 694         }
 695
 696         /**
 697          * Environment check for DB types.
 698          * @return bool
 699          */
 700         protected function envCheckDB() {
 701                 global $wgLang;
 702
 703                 $allNames = [];
 704
 705                 // Messages: config-type-mysql, config-type-postgres, config-type-oracle,
 706                 // config-type-sqlite
 707                 foreach ( self::getDBTypes() as $name ) {
 708                         $allNames[] = wfMessage( "config-type-$name" )->text();
 709                 }
 710
 711                 $databases = $this->getCompiledDBs();
 712
 713                 $databases = array_flip( $databases );
 714                 foreach ( array_keys( $databases ) as $db ) {
 715                         $installer = $this->getDBInstaller( $db );
 716                         $status = $installer->checkPrerequisites();
 717                         if ( !$status->isGood() ) {
 718                                 $this->showStatusMessage( $status );
 719                         }
 720                         if ( !$status->isOK() ) {
 721                                 unset( $databases[$db] );
 722                         }
 723                 }
 724                 $databases = array_flip( $databases );
 725                 if ( !$databases ) {
 726                         $this->showError( 'config-no-db', $wgLang->commaList( $allNames ), count( $allNames ) );
 727
 728                         // @todo FIXME: This only works for the web installer!
 729                         return false;
 730                 }
 731
 732                 return true;
 733         }
 734
 735         /**
 736          * Some versions of libxml+PHP break < and > encoding horribly
 737          * @return bool
 738          */
 739         protected function envCheckBrokenXML() {
 740                 $test = new PhpXmlBugTester();
 741                 if ( !$test->ok ) {
 742                         $this->showError( 'config-brokenlibxml' );
 743
 744                         return false;
 745                 }
 746
 747                 return true;
 748         }
 749
 750         /**
 751          * Environment check for mbstring.func_overload.
 752          * @return bool
 753          */
 754         protected function envCheckMbstring() {
 755                 if ( wfIniGetBool( 'mbstring.func_overload' ) ) {
 756                         $this->showError( 'config-mbstring' );
 757
 758                         return false;
 759                 }
 760
 761                 return true;
 762         }
 763
 764         /**
 765          * Environment check for the XML module.
 766          * @return bool
 767          */
 768         protected function envCheckXML() {
 769                 if ( !function_exists( "utf8_encode" ) ) {
 770                         $this->showError( 'config-xml-bad' );
 771
 772                         return false;
 773                 }
 774
 775                 return true;
 776         }
 777
 778         /**
 779          * Environment check for the PCRE module.
 780          *
 781          * @note If this check were to fail, the parser would
 782          *   probably throw an exception before the result
 783          *   of this check is shown to the user.
 784          * @return bool
 785          */
 786         protected function envCheckPCRE() {
 787                 MediaWiki\suppressWarnings();
 788                 $regexd = preg_replace( '/[\x{0430}-\x{04FF}]/iu', '', '-АБВГД-' );
 789                 // Need to check for \p support too, as PCRE can be compiled
 790                 // with utf8 support, but not unicode property support.
 791                 // check that \p{Zs} (space separators) matches
 792                 // U+3000 (Ideographic space)
 793                 $regexprop = preg_replace( '/\p{Zs}/u', '', "-\xE3\x80\x80-" );
 794                 MediaWiki\restoreWarnings();
 795                 if ( $regexd != '--' || $regexprop != '--' ) {
 796                         $this->showError( 'config-pcre-no-utf8' );
 797
 798                         return false;
 799                 }
 800
 801                 return true;
 802         }
 803
 804         /**
 805          * Environment check for available memory.
 806          * @return bool
 807          */
 808         protected function envCheckMemory() {
 809                 $limit = ini_get( 'memory_limit' );
 810
 811                 if ( !$limit || $limit == -1 ) {
 812                         return true;
 813                 }
 814
 815                 $n = wfShorthandToInteger( $limit );
 816
 817                 if ( $n < $this->minMemorySize * 1024 * 1024 ) {
 818                         $newLimit = "{$this->minMemorySize}M";
 819
 820                         if ( ini_set( "memory_limit", $newLimit ) === false ) {
 821                                 $this->showMessage( 'config-memory-bad', $limit );
 822                         } else {
 823                                 $this->showMessage( 'config-memory-raised', $limit, $newLimit );
 824                                 $this->setVar( '_RaiseMemory', true );
 825                         }
 826                 }
 827
 828                 return true;
 829         }
 830
 831         /**
 832          * Environment check for compiled object cache types.
 833          */
 834         protected function envCheckCache() {
 835                 $caches = [];
 836                 foreach ( $this->objectCaches as $name => $function ) {
 837                         if ( function_exists( $function ) ) {
 838                                 if ( $name == 'xcache' && !wfIniGetBool( 'xcache.var_size' ) ) {
 839                                         continue;
 840                                 }
 841                                 $caches[$name] = true;
 842                         }
 843                 }
 844
 845                 if ( !$caches ) {
 846                         $key = 'config-no-cache-apcu';
 847                         $this->showMessage( $key );
 848                 }
 849
 850                 $this->setVar( '_Caches', $caches );
 851         }
 852
 853         /**
 854          * Scare user to death if they have mod_security or mod_security2
 855          * @return bool
 856          */
 857         protected function envCheckModSecurity() {
 858                 if ( self::apacheModulePresent( 'mod_security' )
 859                         || self::apacheModulePresent( 'mod_security2' ) ) {
 860                         $this->showMessage( 'config-mod-security' );
 861                 }
 862
 863                 return true;
 864         }
 865
 866         /**
 867          * Search for GNU diff3.
 868          * @return bool
 869          */
 870         protected function envCheckDiff3() {
 871                 $names = [ "gdiff3", "diff3", "diff3.exe" ];
 872                 $versionInfo = [ '$1 --version 2>&1', 'GNU diffutils' ];
 873
 874                 $diff3 = self::locateExecutableInDefaultPaths( $names, $versionInfo );
 875
 876                 if ( $diff3 ) {
 877                         $this->setVar( 'wgDiff3', $diff3 );
 878                 } else {
 879                         $this->setVar( 'wgDiff3', false );
 880                         $this->showMessage( 'config-diff3-bad' );
 881                 }
 882
 883                 return true;
 884         }
 885
 886         /**
 887          * Environment check for ImageMagick and GD.
 888          * @return bool
 889          */
 890         protected function envCheckGraphics() {
 891                 $names = [ wfIsWindows() ? 'convert.exe' : 'convert' ];
 892                 $versionInfo = [ '$1 -version', 'ImageMagick' ];
 893                 $convert = self::locateExecutableInDefaultPaths( $names, $versionInfo );
 894
 895                 $this->setVar( 'wgImageMagickConvertCommand', '' );
 896                 if ( $convert ) {
 897                         $this->setVar( 'wgImageMagickConvertCommand', $convert );
 898                         $this->showMessage( 'config-imagemagick', $convert );
 899
 900                         return true;
 901                 } elseif ( function_exists( 'imagejpeg' ) ) {
 902                         $this->showMessage( 'config-gd' );
 903                 } else {
 904                         $this->showMessage( 'config-no-scaling' );
 905                 }
 906
 907                 return true;
 908         }
 909
 910         /**
 911          * Search for git.
 912          *
 913          * @since 1.22
 914          * @return bool
 915          */
 916         protected function envCheckGit() {
 917                 $names = [ wfIsWindows() ? 'git.exe' : 'git' ];
 918                 $versionInfo = [ '$1 --version', 'git version' ];
 919
 920                 $git = self::locateExecutableInDefaultPaths( $names, $versionInfo );
 921
 922                 if ( $git ) {
 923                         $this->setVar( 'wgGitBin', $git );
 924                         $this->showMessage( 'config-git', $git );
 925                 } else {
 926                         $this->setVar( 'wgGitBin', false );
 927                         $this->showMessage( 'config-git-bad' );
 928                 }
 929
 930                 return true;
 931         }
 932
 933         /**
 934          * Environment check to inform user which server we've assumed.
 935          *
 936          * @return bool
 937          */
 938         protected function envCheckServer() {
 939                 $server = $this->envGetDefaultServer();
 940                 if ( $server !== null ) {
 941                         $this->showMessage( 'config-using-server', $server );
 942                 }
 943                 return true;
 944         }
 945
 946         /**
 947          * Environment check to inform user which paths we've assumed.
 948          *
 949          * @return bool
 950          */
 951         protected function envCheckPath() {
 952                 $this->showMessage(
 953                         'config-using-uri',
 954                         $this->getVar( 'wgServer' ),
 955                         $this->getVar( 'wgScriptPath' )
 956                 );
 957                 return true;
 958         }
 959
 960         /**
 961          * Environment check for preferred locale in shell
 962          * @return bool
 963          */
 964         protected function envCheckShellLocale() {
 965                 $os = php_uname( 's' );
 966                 $supported = [ 'Linux', 'SunOS', 'HP-UX', 'Darwin' ]; # Tested these
 967
 968                 if ( !in_array( $os, $supported ) ) {
 969                         return true;
 970                 }
 971
 972                 # Get a list of available locales.
 973                 $ret = false;
 974                 $lines = wfShellExec( '/usr/bin/locale -a', $ret );
 975
 976                 if ( $ret ) {
 977                         return true;
 978                 }
 979
 980                 $lines = array_map( 'trim', explode( "\n", $lines ) );
 981                 $candidatesByLocale = [];
 982                 $candidatesByLang = [];
 983
 984                 foreach ( $lines as $line ) {
 985                         if ( $line === '' ) {
 986                                 continue;
 987                         }
 988
 989                         if ( !preg_match( '/^([a-zA-Z]+)(_[a-zA-Z]+|)\.(utf8|UTF-8)(@[a-zA-Z_]*|)$/i', $line, $m ) ) {
 990                                 continue;
 991                         }
 992
 993                         list( , $lang, , , ) = $m;
 994
 995                         $candidatesByLocale[$m[0]] = $m;
 996                         $candidatesByLang[$lang][] = $m;
 997                 }
 998
 999                 # Try the current value of LANG.
1000                 if ( isset( $candidatesByLocale[getenv( 'LANG' )] ) ) {
1001                         $this->setVar( 'wgShellLocale', getenv( 'LANG' ) );
1002
1003                         return true;
1004                 }
1005
1006                 # Try the most common ones.
1007                 $commonLocales = [ 'en_US.UTF-8', 'en_US.utf8', 'de_DE.UTF-8', 'de_DE.utf8' ];
1008                 foreach ( $commonLocales as $commonLocale ) {
1009                         if ( isset( $candidatesByLocale[$commonLocale] ) ) {
1010                                 $this->setVar( 'wgShellLocale', $commonLocale );
1011
1012                                 return true;
1013                         }
1014                 }
1015
1016                 # Is there an available locale in the Wiki's language?
1017                 $wikiLang = $this->getVar( 'wgLanguageCode' );
1018
1019                 if ( isset( $candidatesByLang[$wikiLang] ) ) {
1020                         $m = reset( $candidatesByLang[$wikiLang] );
1021                         $this->setVar( 'wgShellLocale', $m[0] );
1022
1023                         return true;
1024                 }
1025
1026                 # Are there any at all?
1027                 if ( count( $candidatesByLocale ) ) {
1028                         $m = reset( $candidatesByLocale );
1029                         $this->setVar( 'wgShellLocale', $m[0] );
1030
1031                         return true;
1032                 }
1033
1034                 # Give up.
1035                 return true;
1036         }
1037
1038         /**
1039          * Environment check for the permissions of the uploads directory
1040          * @return bool
1041          */
1042         protected function envCheckUploadsDirectory() {
1043                 global $IP;
1044
1045                 $dir = $IP . '/images/';
1046                 $url = $this->getVar( 'wgServer' ) . $this->getVar( 'wgScriptPath' ) . '/images/';
1047                 $safe = !$this->dirIsExecutable( $dir, $url );
1048
1049                 if ( !$safe ) {
1050                         $this->showMessage( 'config-uploads-not-safe', $dir );
1051                 }
1052
1053                 return true;
1054         }
1055
1056         /**
1057          * Checks if suhosin.get.max_value_length is set, and if so generate
1058          * a warning because it decreases ResourceLoader performance.
1059          * @return bool
1060          */
1061         protected function envCheckSuhosinMaxValueLength() {
1062                 $maxValueLength = ini_get( 'suhosin.get.max_value_length' );
1063                 if ( $maxValueLength > 0 && $maxValueLength < 1024 ) {
1064                         // Only warn if the value is below the sane 1024
1065                         $this->showMessage( 'config-suhosin-max-value-length', $maxValueLength );
1066                 }
1067
1068                 return true;
1069         }
1070
1071         /**
1072          * Convert a hex string representing a Unicode code point to that code point.
1073          * @param string $c
1074          * @return string
1075          */
1076         protected function unicodeChar( $c ) {
1077                 $c = hexdec( $c );
1078                 if ( $c <= 0x7F ) {
1079                         return chr( $c );
1080                 } elseif ( $c <= 0x7FF ) {
1081                         return chr( 0xC0 | $c >> 6 ) . chr( 0x80 | $c & 0x3F );
1082                 } elseif ( $c <= 0xFFFF ) {
1083                         return chr( 0xE0 | $c >> 12 ) . chr( 0x80 | $c >> 6 & 0x3F ) .
1084                                 chr( 0x80 | $c & 0x3F );
1085                 } elseif ( $c <= 0x10FFFF ) {
1086                         return chr( 0xF0 | $c >> 18 ) . chr( 0x80 | $c >> 12 & 0x3F ) .
1087                                 chr( 0x80 | $c >> 6 & 0x3F ) .
1088                                 chr( 0x80 | $c & 0x3F );
1089                 } else {
1090                         return false;
1091                 }
1092         }
1093
1094         /**
1095          * Check the libicu version
1096          */
1097         protected function envCheckLibicu() {
1098                 /**
1099                  * This needs to be updated something that the latest libicu
1100                  * will properly normalize.  This normalization was found at
1101                  * http://www.unicode.org/versions/Unicode5.2.0/#Character_Additions
1102                  * Note that we use the hex representation to create the code
1103                  * points in order to avoid any Unicode-destroying during transit.
1104                  */
1105                 $not_normal_c = $this->unicodeChar( "FA6C" );
1106                 $normal_c = $this->unicodeChar( "242EE" );
1107
1108                 $useNormalizer = 'php';
1109                 $needsUpdate = false;
1110
1111                 if ( function_exists( 'normalizer_normalize' ) ) {
1112                         $useNormalizer = 'intl';
1113                         $intl = normalizer_normalize( $not_normal_c, Normalizer::FORM_C );
1114                         if ( $intl !== $normal_c ) {
1115                                 $needsUpdate = true;
1116                         }
1117                 }
1118
1119                 // Uses messages 'config-unicode-using-php' and 'config-unicode-using-intl'
1120                 if ( $useNormalizer === 'php' ) {
1121                         $this->showMessage( 'config-unicode-pure-php-warning' );
1122                 } else {
1123                         $this->showMessage( 'config-unicode-using-' . $useNormalizer );
1124                         if ( $needsUpdate ) {
1125                                 $this->showMessage( 'config-unicode-update-warning' );
1126                         }
1127                 }
1128         }
1129
1130         /**
1131          * @return bool
1132          */
1133         protected function envCheckCtype() {
1134                 if ( !function_exists( 'ctype_digit' ) ) {
1135                         $this->showError( 'config-ctype' );
1136
1137                         return false;
1138                 }
1139
1140                 return true;
1141         }
1142
1143         /**
1144          * @return bool
1145          */
1146         protected function envCheckIconv() {
1147                 if ( !function_exists( 'iconv' ) ) {
1148                         $this->showError( 'config-iconv' );
1149
1150                         return false;
1151                 }
1152
1153                 return true;
1154         }
1155
1156         /**
1157          * @return bool
1158          */
1159         protected function envCheckJSON() {
1160                 if ( !function_exists( 'json_decode' ) ) {
1161                         $this->showError( 'config-json' );
1162
1163                         return false;
1164                 }
1165
1166                 return true;
1167         }
1168
1169         /**
1170          * Environment prep for the server hostname.
1171          */
1172         protected function envPrepServer() {
1173                 $server = $this->envGetDefaultServer();
1174                 if ( $server !== null ) {
1175                         $this->setVar( 'wgServer', $server );
1176                 }
1177         }
1178
1179         /**
1180          * Helper function to be called from envPrepServer()
1181          * @return string
1182          */
1183         abstract protected function envGetDefaultServer();
1184
1185         /**
1186          * Environment prep for setting $IP and $wgScriptPath.
1187          */
1188         protected function envPrepPath() {
1189                 global $IP;
1190                 $IP = dirname( dirname( __DIR__ ) );
1191                 $this->setVar( 'IP', $IP );
1192         }
1193
1194         /**
1195          * Get an array of likely places we can find executables. Check a bunch
1196          * of known Unix-like defaults, as well as the PATH environment variable
1197          * (which should maybe make it work for Windows?)
1198          *
1199          * @return array
1200          */
1201         protected static function getPossibleBinPaths() {
1202                 return array_merge(
1203                         [ '/usr/bin', '/usr/local/bin', '/opt/csw/bin',
1204                                 '/usr/gnu/bin', '/usr/sfw/bin', '/sw/bin', '/opt/local/bin' ],
1205                         explode( PATH_SEPARATOR, getenv( 'PATH' ) )
1206                 );
1207         }
1208
1209         /**
1210          * Search a path for any of the given executable names. Returns the
1211          * executable name if found. Also checks the version string returned
1212          * by each executable.
1213          *
1214          * Used only by environment checks.
1215          *
1216          * @param string $path Path to search
1217          * @param array $names Array of executable names
1218          * @param array|bool $versionInfo False or array with two members:
1219          *   0 => Command to run for version check, with $1 for the full executable name
1220          *   1 => String to compare the output with
1221          *
1222          * If $versionInfo is not false, only executables with a version
1223          * matching $versionInfo[1] will be returned.
1224          * @return bool|string
1225          */
1226         public static function locateExecutable( $path, $names, $versionInfo = false ) {
1227                 if ( !is_array( $names ) ) {
1228                         $names = [ $names ];
1229                 }
1230
1231                 foreach ( $names as $name ) {
1232                         $command = $path . DIRECTORY_SEPARATOR . $name;
1233
1234                         MediaWiki\suppressWarnings();
1235                         $file_exists = file_exists( $command );
1236                         MediaWiki\restoreWarnings();
1237
1238                         if ( $file_exists ) {
1239                                 if ( !$versionInfo ) {
1240                                         return $command;
1241                                 }
1242
1243                                 $file = str_replace( '$1', wfEscapeShellArg( $command ), $versionInfo[0] );
1244                                 if ( strstr( wfShellExec( $file ), $versionInfo[1] ) !== false ) {
1245                                         return $command;
1246                                 }
1247                         }
1248                 }
1249
1250                 return false;
1251         }
1252
1253         /**
1254          * Same as locateExecutable(), but checks in getPossibleBinPaths() by default
1255          * @see locateExecutable()
1256          * @param array $names Array of possible names.
1257          * @param array|bool $versionInfo Default: false or array with two members:
1258          *   0 => Command to run for version check, with $1 for the full executable name
1259          *   1 => String to compare the output with
1260          *
1261          * If $versionInfo is not false, only executables with a version
1262          * matching $versionInfo[1] will be returned.
1263          * @return bool|string
1264          */
1265         public static function locateExecutableInDefaultPaths( $names, $versionInfo = false ) {
1266                 foreach ( self::getPossibleBinPaths() as $path ) {
1267                         $exe = self::locateExecutable( $path, $names, $versionInfo );
1268                         if ( $exe !== false ) {
1269                                 return $exe;
1270                         }
1271                 }
1272
1273                 return false;
1274         }
1275
1276         /**
1277          * Checks if scripts located in the given directory can be executed via the given URL.
1278          *
1279          * Used only by environment checks.
1280          * @param string $dir
1281          * @param string $url
1282          * @return bool|int|string
1283          */
1284         public function dirIsExecutable( $dir, $url ) {
1285                 $scriptTypes = [
1286                         'php' => [
1287                                 "<?php echo 'ex' . 'ec';",
1288                                 "#!/var/env php5\n<?php echo 'ex' . 'ec';",
1289                         ],
1290                 ];
1291
1292                 // it would be good to check other popular languages here, but it'll be slow.
1293
1294                 MediaWiki\suppressWarnings();
1295
1296                 foreach ( $scriptTypes as $ext => $contents ) {
1297                         foreach ( $contents as $source ) {
1298                                 $file = 'exectest.' . $ext;
1299
1300                                 if ( !file_put_contents( $dir . $file, $source ) ) {
1301                                         break;
1302                                 }
1303
1304                                 try {
1305                                         $text = Http::get( $url . $file, [ 'timeout' => 3 ], __METHOD__ );
1306                                 } catch ( Exception $e ) {
1307                                         // Http::get throws with allow_url_fopen = false and no curl extension.
1308                                         $text = null;
1309                                 }
1310                                 unlink( $dir . $file );
1311
1312                                 if ( $text == 'exec' ) {
1313                                         MediaWiki\restoreWarnings();
1314
1315                                         return $ext;
1316                                 }
1317                         }
1318                 }
1319
1320                 MediaWiki\restoreWarnings();
1321
1322                 return false;
1323         }
1324
1325         /**
1326          * Checks for presence of an Apache module. Works only if PHP is running as an Apache module, too.
1327          *
1328          * @param string $moduleName Name of module to check.
1329          * @return bool
1330          */
1331         public static function apacheModulePresent( $moduleName ) {
1332                 if ( function_exists( 'apache_get_modules' ) && in_array( $moduleName, apache_get_modules() ) ) {
1333                         return true;
1334                 }
1335                 // try it the hard way
1336                 ob_start();
1337                 phpinfo( INFO_MODULES );
1338                 $info = ob_get_clean();
1339
1340                 return strpos( $info, $moduleName ) !== false;
1341         }
1342
1343         /**
1344          * ParserOptions are constructed before we determined the language, so fix it
1345          *
1346          * @param Language $lang
1347          */
1348         public function setParserLanguage( $lang ) {
1349                 $this->parserOptions->setTargetLanguage( $lang );
1350                 $this->parserOptions->setUserLang( $lang );
1351         }
1352
1353         /**
1354          * Overridden by WebInstaller to provide lastPage parameters.
1355          * @param string $page
1356          * @return string
1357          */
1358         protected function getDocUrl( $page ) {
1359                 return "{$_SERVER['PHP_SELF']}?page=" . urlencode( $page );
1360         }
1361
1362         /**
1363          * Finds extensions that follow the format /$directory/Name/Name.php,
1364          * and returns an array containing the value for 'Name' for each found extension.
1365          *
1366          * Reasonable values for $directory include 'extensions' (the default) and 'skins'.
1367          *
1368          * @param string $directory Directory to search in
1369          * @return array
1370          */
1371         public function findExtensions( $directory = 'extensions' ) {
1372                 if ( $this->getVar( 'IP' ) === null ) {
1373                         return [];
1374                 }
1375
1376                 $extDir = $this->getVar( 'IP' ) . '/' . $directory;
1377                 if ( !is_readable( $extDir ) || !is_dir( $extDir ) ) {
1378                         return [];
1379                 }
1380
1381                 // extensions -> extension.json, skins -> skin.json
1382                 $jsonFile = substr( $directory, 0, strlen( $directory ) -1 ) . '.json';
1383
1384                 $dh = opendir( $extDir );
1385                 $exts = [];
1386                 while ( ( $file = readdir( $dh ) ) !== false ) {
1387                         if ( !is_dir( "$extDir/$file" ) ) {
1388                                 continue;
1389                         }
1390                         if ( file_exists( "$extDir/$file/$jsonFile" ) || file_exists( "$extDir/$file/$file.php" ) ) {
1391                                 $exts[] = $file;
1392                         }
1393                 }
1394                 closedir( $dh );
1395                 natcasesort( $exts );
1396
1397                 return $exts;
1398         }
1399
1400         /**
1401          * Returns a default value to be used for $wgDefaultSkin: normally the one set in DefaultSettings,
1402          * but will fall back to another if the default skin is missing and some other one is present
1403          * instead.
1404          *
1405          * @param string[] $skinNames Names of installed skins.
1406          * @return string
1407          */
1408         public function getDefaultSkin( array $skinNames ) {
1409                 $defaultSkin = $GLOBALS['wgDefaultSkin'];
1410                 if ( !$skinNames || in_array( $defaultSkin, $skinNames ) ) {
1411                         return $defaultSkin;
1412                 } else {
1413                         return $skinNames[0];
1414                 }
1415         }
1416
1417         /**
1418          * Installs the auto-detected extensions.
1419          *
1420          * @return Status
1421          */
1422         protected function includeExtensions() {
1423                 global $IP;
1424                 $exts = $this->getVar( '_Extensions' );
1425                 $IP = $this->getVar( 'IP' );
1426
1427                 /**
1428                  * We need to include DefaultSettings before including extensions to avoid
1429                  * warnings about unset variables. However, the only thing we really
1430                  * want here is $wgHooks['LoadExtensionSchemaUpdates']. This won't work
1431                  * if the extension has hidden hook registration in $wgExtensionFunctions,
1432                  * but we're not opening that can of worms
1433                  * @see https://phabricator.wikimedia.org/T28857
1434                  */
1435                 global $wgAutoloadClasses;
1436                 $wgAutoloadClasses = [];
1437                 $queue = [];
1438
1439                 require "$IP/includes/DefaultSettings.php";
1440
1441                 foreach ( $exts as $e ) {
1442                         if ( file_exists( "$IP/extensions/$e/extension.json" ) ) {
1443                                 $queue["$IP/extensions/$e/extension.json"] = 1;
1444                         } else {
1445                                 require_once "$IP/extensions/$e/$e.php";
1446                         }
1447                 }
1448
1449                 $registry = new ExtensionRegistry();
1450                 $data = $registry->readFromQueue( $queue );
1451                 $wgAutoloadClasses += $data['autoload'];
1452
1453                 $hooksWeWant = isset( $wgHooks['LoadExtensionSchemaUpdates'] ) ?
1454                         $wgHooks['LoadExtensionSchemaUpdates'] : [];
1455
1456                 if ( isset( $data['globals']['wgHooks']['LoadExtensionSchemaUpdates'] ) ) {
1457                         $hooksWeWant = array_merge_recursive(
1458                                 $hooksWeWant,
1459                                 $data['globals']['wgHooks']['LoadExtensionSchemaUpdates']
1460                         );
1461                 }
1462                 // Unset everyone else's hooks. Lord knows what someone might be doing
1463                 // in ParserFirstCallInit (see bug 27171)
1464                 $GLOBALS['wgHooks'] = [ 'LoadExtensionSchemaUpdates' => $hooksWeWant ];
1465
1466                 return Status::newGood();
1467         }
1468
1469         /**
1470          * Get an array of install steps. Should always be in the format of
1471          * array(
1472          *   'name'     => 'someuniquename',
1473          *   'callback' => array( $obj, 'method' ),
1474          * )
1475          * There must be a config-install-$name message defined per step, which will
1476          * be shown on install.
1477          *
1478          * @param DatabaseInstaller $installer DatabaseInstaller so we can make callbacks
1479          * @return array
1480          */
1481         protected function getInstallSteps( DatabaseInstaller $installer ) {
1482                 $coreInstallSteps = [
1483                         [ 'name' => 'database', 'callback' => [ $installer, 'setupDatabase' ] ],
1484                         [ 'name' => 'tables', 'callback' => [ $installer, 'createTables' ] ],
1485                         [ 'name' => 'interwiki', 'callback' => [ $installer, 'populateInterwikiTable' ] ],
1486                         [ 'name' => 'stats', 'callback' => [ $this, 'populateSiteStats' ] ],
1487                         [ 'name' => 'keys', 'callback' => [ $this, 'generateKeys' ] ],
1488                         [ 'name' => 'updates', 'callback' => [ $installer, 'insertUpdateKeys' ] ],
1489                         [ 'name' => 'sysop', 'callback' => [ $this, 'createSysop' ] ],
1490                         [ 'name' => 'mainpage', 'callback' => [ $this, 'createMainpage' ] ],
1491                 ];
1492
1493                 // Build the array of install steps starting from the core install list,
1494                 // then adding any callbacks that wanted to attach after a given step
1495                 foreach ( $coreInstallSteps as $step ) {
1496                         $this->installSteps[] = $step;
1497                         if ( isset( $this->extraInstallSteps[$step['name']] ) ) {
1498                                 $this->installSteps = array_merge(
1499                                         $this->installSteps,
1500                                         $this->extraInstallSteps[$step['name']]
1501                                 );
1502                         }
1503                 }
1504
1505                 // Prepend any steps that want to be at the beginning
1506                 if ( isset( $this->extraInstallSteps['BEGINNING'] ) ) {
1507                         $this->installSteps = array_merge(
1508                                 $this->extraInstallSteps['BEGINNING'],
1509                                 $this->installSteps
1510                         );
1511                 }
1512
1513                 // Extensions should always go first, chance to tie into hooks and such
1514                 if ( count( $this->getVar( '_Extensions' ) ) ) {
1515                         array_unshift( $this->installSteps,
1516                                 [ 'name' => 'extensions', 'callback' => [ $this, 'includeExtensions' ] ]
1517                         );
1518                         $this->installSteps[] = [
1519                                 'name' => 'extension-tables',
1520                                 'callback' => [ $installer, 'createExtensionTables' ]
1521                         ];
1522                 }
1523
1524                 return $this->installSteps;
1525         }
1526
1527         /**
1528          * Actually perform the installation.
1529          *
1530          * @param callable $startCB A callback array for the beginning of each step
1531          * @param callable $endCB A callback array for the end of each step
1532          *
1533          * @return array Array of Status objects
1534          */
1535         public function performInstallation( $startCB, $endCB ) {
1536                 $installResults = [];
1537                 $installer = $this->getDBInstaller();
1538                 $installer->preInstall();
1539                 $steps = $this->getInstallSteps( $installer );
1540                 foreach ( $steps as $stepObj ) {
1541                         $name = $stepObj['name'];
1542                         call_user_func_array( $startCB, [ $name ] );
1543
1544                         // Perform the callback step
1545                         $status = call_user_func( $stepObj['callback'], $installer );
1546
1547                         // Output and save the results
1548                         call_user_func( $endCB, $name, $status );
1549                         $installResults[$name] = $status;
1550
1551                         // If we've hit some sort of fatal, we need to bail.
1552                         // Callback already had a chance to do output above.
1553                         if ( !$status->isOk() ) {
1554                                 break;
1555                         }
1556                 }
1557                 if ( $status->isOk() ) {
1558                         $this->setVar( '_InstallDone', true );
1559                 }
1560
1561                 return $installResults;
1562         }
1563
1564         /**
1565          * Generate $wgSecretKey. Will warn if we had to use an insecure random source.
1566          *
1567          * @return Status
1568          */
1569         public function generateKeys() {
1570                 $keys = [ 'wgSecretKey' => 64 ];
1571                 if ( strval( $this->getVar( 'wgUpgradeKey' ) ) === '' ) {
1572                         $keys['wgUpgradeKey'] = 16;
1573                 }
1574
1575                 return $this->doGenerateKeys( $keys );
1576         }
1577
1578         /**
1579          * Generate a secret value for variables using our CryptRand generator.
1580          * Produce a warning if the random source was insecure.
1581          *
1582          * @param array $keys
1583          * @return Status
1584          */
1585         protected function doGenerateKeys( $keys ) {
1586                 $status = Status::newGood();
1587
1588                 $strong = true;
1589                 foreach ( $keys as $name => $length ) {
1590                         $secretKey = MWCryptRand::generateHex( $length, true );
1591                         if ( !MWCryptRand::wasStrong() ) {
1592                                 $strong = false;
1593                         }
1594
1595                         $this->setVar( $name, $secretKey );
1596                 }
1597
1598                 if ( !$strong ) {
1599                         $names = array_keys( $keys );
1600                         $names = preg_replace( '/^(.*)$/', '\$$1', $names );
1601                         global $wgLang;
1602                         $status->warning( 'config-insecure-keys', $wgLang->listToText( $names ), count( $names ) );
1603                 }
1604
1605                 return $status;
1606         }
1607
1608         /**
1609          * Create the first user account, grant it sysop and bureaucrat rights
1610          *
1611          * @return Status
1612          */
1613         protected function createSysop() {
1614                 $name = $this->getVar( '_AdminName' );
1615                 $user = User::newFromName( $name );
1616
1617                 if ( !$user ) {
1618                         // We should've validated this earlier anyway!
1619                         return Status::newFatal( 'config-admin-error-user', $name );
1620                 }
1621
1622                 if ( $user->idForName() == 0 ) {
1623                         $user->addToDatabase();
1624
1625                         try {
1626                                 $user->setPassword( $this->getVar( '_AdminPassword' ) );
1627                         } catch ( PasswordError $pwe ) {
1628                                 return Status::newFatal( 'config-admin-error-password', $name, $pwe->getMessage() );
1629                         }
1630
1631                         $user->addGroup( 'sysop' );
1632                         $user->addGroup( 'bureaucrat' );
1633                         if ( $this->getVar( '_AdminEmail' ) ) {
1634                                 $user->setEmail( $this->getVar( '_AdminEmail' ) );
1635                         }
1636                         $user->saveSettings();
1637
1638                         // Update user count
1639                         $ssUpdate = new SiteStatsUpdate( 0, 0, 0, 0, 1 );
1640                         $ssUpdate->doUpdate();
1641                 }
1642                 $status = Status::newGood();
1643
1644                 if ( $this->getVar( '_Subscribe' ) && $this->getVar( '_AdminEmail' ) ) {
1645                         $this->subscribeToMediaWikiAnnounce( $status );
1646                 }
1647
1648                 return $status;
1649         }
1650
1651         /**
1652          * @param Status $s
1653          */
1654         private function subscribeToMediaWikiAnnounce( Status $s ) {
1655                 $params = [
1656                         'email' => $this->getVar( '_AdminEmail' ),
1657                         'language' => 'en',
1658                         'digest' => 0
1659                 ];
1660
1661                 // Mailman doesn't support as many languages as we do, so check to make
1662                 // sure their selected language is available
1663                 $myLang = $this->getVar( '_UserLang' );
1664                 if ( in_array( $myLang, $this->mediaWikiAnnounceLanguages ) ) {
1665                         $myLang = $myLang == 'pt-br' ? 'pt_BR' : $myLang; // rewrite to Mailman's pt_BR
1666                         $params['language'] = $myLang;
1667                 }
1668
1669                 if ( MWHttpRequest::canMakeRequests() ) {
1670                         $res = MWHttpRequest::factory( $this->mediaWikiAnnounceUrl,
1671                                 [ 'method' => 'POST', 'postData' => $params ], __METHOD__ )->execute();
1672                         if ( !$res->isOK() ) {
1673                                 $s->warning( 'config-install-subscribe-fail', $res->getMessage() );
1674                         }
1675                 } else {
1676                         $s->warning( 'config-install-subscribe-notpossible' );
1677                 }
1678         }
1679
1680         /**
1681          * Insert Main Page with default content.
1682          *
1683          * @param DatabaseInstaller $installer
1684          * @return Status
1685          */
1686         protected function createMainpage( DatabaseInstaller $installer ) {
1687                 $status = Status::newGood();
1688                 try {
1689                         $page = WikiPage::factory( Title::newMainPage() );
1690                         $content = new WikitextContent(
1691                                 wfMessage( 'mainpagetext' )->inContentLanguage()->text() . "\n\n" .
1692                                 wfMessage( 'mainpagedocfooter' )->inContentLanguage()->text()
1693                         );
1694
1695                         $page->doEditContent( $content,
1696                                 '',
1697                                 EDIT_NEW,
1698                                 false,
1699                                 User::newFromName( 'MediaWiki default' )
1700                         );
1701                 } catch ( Exception $e ) {
1702                         // using raw, because $wgShowExceptionDetails can not be set yet
1703                         $status->fatal( 'config-install-mainpage-failed', $e->getMessage() );
1704                 }
1705
1706                 return $status;
1707         }
1708
1709         /**
1710          * Override the necessary bits of the config to run an installation.
1711          */
1712         public static function overrideConfig() {
1713                 // Use PHP's built-in session handling, since MediaWiki's
1714                 // SessionHandler can't work before we have an object cache set up.
1715                 define( 'MW_NO_SESSION_HANDLER', 1 );
1716
1717                 // Don't access the database
1718                 $GLOBALS['wgUseDatabaseMessages'] = false;
1719                 // Don't cache langconv tables
1720                 $GLOBALS['wgLanguageConverterCacheType'] = CACHE_NONE;
1721                 // Debug-friendly
1722                 $GLOBALS['wgShowExceptionDetails'] = true;
1723                 // Don't break forms
1724                 $GLOBALS['wgExternalLinkTarget'] = '_blank';
1725
1726                 // Extended debugging
1727                 $GLOBALS['wgShowSQLErrors'] = true;
1728                 $GLOBALS['wgShowDBErrorBacktrace'] = true;
1729
1730                 // Allow multiple ob_flush() calls
1731                 $GLOBALS['wgDisableOutputCompression'] = true;
1732
1733                 // Use a sensible cookie prefix (not my_wiki)
1734                 $GLOBALS['wgCookiePrefix'] = 'mw_installer';
1735
1736                 // Some of the environment checks make shell requests, remove limits
1737                 $GLOBALS['wgMaxShellMemory'] = 0;
1738
1739                 // Override the default CookieSessionProvider with a dummy
1740                 // implementation that won't stomp on PHP's cookies.
1741                 $GLOBALS['wgSessionProviders'] = [
1742                         [
1743                                 'class' => 'InstallerSessionProvider',
1744                                 'args' => [ [
1745                                         'priority' => 1,
1746                                 ] ]
1747                         ]
1748                 ];
1749
1750                 // Don't try to use any object cache for SessionManager either.
1751                 $GLOBALS['wgSessionCacheType'] = CACHE_NONE;
1752         }
1753
1754         /**
1755          * Add an installation step following the given step.
1756          *
1757          * @param callable $callback A valid installation callback array, in this form:
1758          *    array( 'name' => 'some-unique-name', 'callback' => array( $obj, 'function' ) );
1759          * @param string $findStep The step to find. Omit to put the step at the beginning
1760          */
1761         public function addInstallStep( $callback, $findStep = 'BEGINNING' ) {
1762                 $this->extraInstallSteps[$findStep][] = $callback;
1763         }
1764
1765         /**
1766          * Disable the time limit for execution.
1767          * Some long-running pages (Install, Upgrade) will want to do this
1768          */
1769         protected function disableTimeLimit() {
1770                 MediaWiki\suppressWarnings();
1771                 set_time_limit( 0 );
1772                 MediaWiki\restoreWarnings();
1773         }
1774 }