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 = array();
  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 = array(
  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 = array(
 118                 'envCheckDB',
 119                 'envCheckRegisterGlobals',
 120                 'envCheckBrokenXML',
 121                 'envCheckMagicQuotes',
 122                 'envCheckMbstring',
 123                 'envCheckSafeMode',
 124                 'envCheckXML',
 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                 'envCheckCtype',
 139                 'envCheckIconv',
 140                 'envCheckJSON',
 141         );
 142
 143         /**
 144          * A list of environment preparation methods called by doEnvironmentPreps().
 145          *
 146          * @var array
 147          */
 148         protected $envPreps = array(
 149                 'envPrepServer',
 150                 'envPrepPath',
 151         );
 152
 153         /**
 154          * MediaWiki configuration globals that will eventually be passed through
 155          * to LocalSettings.php. The names only are given here, the defaults
 156          * typically come from DefaultSettings.php.
 157          *
 158          * @var array
 159          */
 160         protected $defaultVarNames = array(
 161                 'wgSitename',
 162                 'wgPasswordSender',
 163                 'wgLanguageCode',
 164                 'wgRightsIcon',
 165                 'wgRightsText',
 166                 'wgRightsUrl',
 167                 'wgMainCacheType',
 168                 'wgEnableEmail',
 169                 'wgEnableUserEmail',
 170                 'wgEnotifUserTalk',
 171                 'wgEnotifWatchlist',
 172                 'wgEmailAuthentication',
 173                 'wgDBtype',
 174                 'wgDiff3',
 175                 'wgImageMagickConvertCommand',
 176                 'wgGitBin',
 177                 'IP',
 178                 'wgScriptPath',
 179                 'wgMetaNamespace',
 180                 'wgDeletedDirectory',
 181                 'wgEnableUploads',
 182                 'wgShellLocale',
 183                 'wgSecretKey',
 184                 'wgUseInstantCommons',
 185                 'wgUpgradeKey',
 186                 'wgDefaultSkin',
 187         );
 188
 189         /**
 190          * Variables that are stored alongside globals, and are used for any
 191          * configuration of the installation process aside from the MediaWiki
 192          * configuration. Map of names to defaults.
 193          *
 194          * @var array
 195          */
 196         protected $internalDefaults = array(
 197                 '_UserLang' => 'en',
 198                 '_Environment' => false,
 199                 '_SafeMode' => false,
 200                 '_RaiseMemory' => false,
 201                 '_UpgradeDone' => false,
 202                 '_InstallDone' => false,
 203                 '_Caches' => array(),
 204                 '_InstallPassword' => '',
 205                 '_SameAccount' => true,
 206                 '_CreateDBAccount' => false,
 207                 '_NamespaceType' => 'site-name',
 208                 '_AdminName' => '', // will be set later, when the user selects language
 209                 '_AdminPassword' => '',
 210                 '_AdminPasswordConfirm' => '',
 211                 '_AdminEmail' => '',
 212                 '_Subscribe' => false,
 213                 '_SkipOptional' => 'continue',
 214                 '_RightsProfile' => 'wiki',
 215                 '_LicenseCode' => 'none',
 216                 '_CCDone' => false,
 217                 '_Extensions' => array(),
 218                 '_Skins' => array(),
 219                 '_MemCachedServers' => '',
 220                 '_UpgradeKeySupplied' => false,
 221                 '_ExistingDBSettings' => false,
 222
 223                 // $wgLogo is probably wrong (bug 48084); set something that will work.
 224                 // Single quotes work fine here, as LocalSettingsGenerator outputs this unescaped.
 225                 'wgLogo' => '$wgResourceBasePath/resources/assets/wiki.png',
 226         );
 227
 228         /**
 229          * The actual list of installation steps. This will be initialized by getInstallSteps()
 230          *
 231          * @var array
 232          */
 233         private $installSteps = array();
 234
 235         /**
 236          * Extra steps for installation, for things like DatabaseInstallers to modify
 237          *
 238          * @var array
 239          */
 240         protected $extraInstallSteps = array();
 241
 242         /**
 243          * Known object cache types and the functions used to test for their existence.
 244          *
 245          * @var array
 246          */
 247         protected $objectCaches = array(
 248                 'xcache' => 'xcache_get',
 249                 'apc' => 'apc_fetch',
 250                 'wincache' => 'wincache_ucache_get'
 251         );
 252
 253         /**
 254          * User rights profiles.
 255          *
 256          * @var array
 257          */
 258         public $rightsProfiles = array(
 259                 'wiki' => array(),
 260                 'no-anon' => array(
 261                         '*' => array( 'edit' => false )
 262                 ),
 263                 'fishbowl' => array(
 264                         '*' => array(
 265                                 'createaccount' => false,
 266                                 'edit' => false,
 267                         ),
 268                 ),
 269                 'private' => array(
 270                         '*' => array(
 271                                 'createaccount' => false,
 272                                 'edit' => false,
 273                                 'read' => false,
 274                         ),
 275                 ),
 276         );
 277
 278         /**
 279          * License types.
 280          *
 281          * @var array
 282          */
 283         public $licenses = array(
 284                 'cc-by' => array(
 285                         'url' => 'https://creativecommons.org/licenses/by/3.0/',
 286                         'icon' => '$wgResourceBasePath/resources/assets/licenses/cc-by.png',
 287                 ),
 288                 'cc-by-sa' => array(
 289                         'url' => 'https://creativecommons.org/licenses/by-sa/3.0/',
 290                         'icon' => '$wgResourceBasePath/resources/assets/licenses/cc-by-sa.png',
 291                 ),
 292                 'cc-by-nc-sa' => array(
 293                         'url' => 'https://creativecommons.org/licenses/by-nc-sa/3.0/',
 294                         'icon' => '$wgResourceBasePath/resources/assets/licenses/cc-by-nc-sa.png',
 295                 ),
 296                 'cc-0' => array(
 297                         'url' => 'https://creativecommons.org/publicdomain/zero/1.0/',
 298                         'icon' => '$wgResourceBasePath/resources/assets/licenses/cc-0.png',
 299                 ),
 300                 'pd' => array(
 301                         'url' => '',
 302                         'icon' => '$wgResourceBasePath/resources/assets/licenses/public-domain.png',
 303                 ),
 304                 'gfdl' => array(
 305                         'url' => 'https://www.gnu.org/copyleft/fdl.html',
 306                         'icon' => '$wgResourceBasePath/resources/assets/licenses/gnu-fdl.png',
 307                 ),
 308                 'none' => array(
 309                         'url' => '',
 310                         'icon' => '',
 311                         'text' => ''
 312                 ),
 313                 'cc-choose' => array(
 314                         // Details will be filled in by the selector.
 315                         'url' => '',
 316                         'icon' => '',
 317                         'text' => '',
 318                 ),
 319         );
 320
 321         /**
 322          * URL to mediawiki-announce subscription
 323          */
 324         protected $mediaWikiAnnounceUrl =
 325                 'https://lists.wikimedia.org/mailman/subscribe/mediawiki-announce';
 326
 327         /**
 328          * Supported language codes for Mailman
 329          */
 330         protected $mediaWikiAnnounceLanguages = array(
 331                 'ca', 'cs', 'da', 'de', 'en', 'es', 'et', 'eu', 'fi', 'fr', 'hr', 'hu',
 332                 'it', 'ja', 'ko', 'lt', 'nl', 'no', 'pl', 'pt', 'pt-br', 'ro', 'ru',
 333                 'sl', 'sr', 'sv', 'tr', 'uk'
 334         );
 335
 336         /**
 337          * UI interface for displaying a short message
 338          * The parameters are like parameters to wfMessage().
 339          * The messages will be in wikitext format, which will be converted to an
 340          * output format such as HTML or text before being sent to the user.
 341          * @param string $msg
 342          */
 343         abstract public function showMessage( $msg /*, ... */ );
 344
 345         /**
 346          * Same as showMessage(), but for displaying errors
 347          * @param string $msg
 348          */
 349         abstract public function showError( $msg /*, ... */ );
 350
 351         /**
 352          * Show a message to the installing user by using a Status object
 353          * @param Status $status
 354          */
 355         abstract public function showStatusMessage( Status $status );
 356
 357         /**
 358          * Constructor, always call this from child classes.
 359          */
 360         public function __construct() {
 361                 global $wgMessagesDirs, $wgUser;
 362
 363                 // Disable the i18n cache
 364                 Language::getLocalisationCache()->disableBackend();
 365                 // Disable LoadBalancer and wfGetDB etc.
 366                 LBFactory::disableBackend();
 367
 368                 // Disable object cache (otherwise CACHE_ANYTHING will try CACHE_DB and
 369                 // SqlBagOStuff will then throw since we just disabled wfGetDB)
 370                 $GLOBALS['wgMemc'] = new EmptyBagOStuff;
 371                 ObjectCache::clear();
 372                 $emptyCache = array( 'class' => 'EmptyBagOStuff' );
 373                 $GLOBALS['wgObjectCaches'] = array(
 374                         CACHE_NONE => $emptyCache,
 375                         CACHE_DB => $emptyCache,
 376                         CACHE_ANYTHING => $emptyCache,
 377                         CACHE_MEMCACHED => $emptyCache,
 378                 );
 379
 380                 // Load the installer's i18n.
 381                 $wgMessagesDirs['MediawikiInstaller'] = __DIR__ . '/i18n';
 382
 383                 // Having a user with id = 0 safeguards us from DB access via User::loadOptions().
 384                 $wgUser = User::newFromId( 0 );
 385
 386                 $this->settings = $this->internalDefaults;
 387
 388                 foreach ( $this->defaultVarNames as $var ) {
 389                         $this->settings[$var] = $GLOBALS[$var];
 390                 }
 391
 392                 $this->doEnvironmentPreps();
 393
 394                 $this->compiledDBs = array();
 395                 foreach ( self::getDBTypes() as $type ) {
 396                         $installer = $this->getDBInstaller( $type );
 397
 398                         if ( !$installer->isCompiled() ) {
 399                                 continue;
 400                         }
 401                         $this->compiledDBs[] = $type;
 402                 }
 403
 404                 $this->parserTitle = Title::newFromText( 'Installer' );
 405                 $this->parserOptions = new ParserOptions; // language will be wrong :(
 406                 $this->parserOptions->setEditSection( false );
 407         }
 408
 409         /**
 410          * Get a list of known DB types.
 411          *
 412          * @return array
 413          */
 414         public static function getDBTypes() {
 415                 return self::$dbTypes;
 416         }
 417
 418         /**
 419          * Do initial checks of the PHP environment. Set variables according to
 420          * the observed environment.
 421          *
 422          * It's possible that this may be called under the CLI SAPI, not the SAPI
 423          * that the wiki will primarily run under. In that case, the subclass should
 424          * initialise variables such as wgScriptPath, before calling this function.
 425          *
 426          * Under the web subclass, it can already be assumed that PHP 5+ is in use
 427          * and that sessions are working.
 428          *
 429          * @return Status
 430          */
 431         public function doEnvironmentChecks() {
 432                 // Php version has already been checked by entry scripts
 433                 // Show message here for information purposes
 434                 if ( wfIsHHVM() ) {
 435                         $this->showMessage( 'config-env-hhvm', HHVM_VERSION );
 436                 } else {
 437                         $this->showMessage( 'config-env-php', PHP_VERSION );
 438                 }
 439
 440                 $good = true;
 441                 // Must go here because an old version of PCRE can prevent other checks from completing
 442                 list( $pcreVersion ) = explode( ' ', PCRE_VERSION, 2 );
 443                 if ( version_compare( $pcreVersion, self::MINIMUM_PCRE_VERSION, '<' ) ) {
 444                         $this->showError( 'config-pcre-old', self::MINIMUM_PCRE_VERSION, $pcreVersion );
 445                         $good = false;
 446                 } else {
 447                         foreach ( $this->envChecks as $check ) {
 448                                 $status = $this->$check();
 449                                 if ( $status === false ) {
 450                                         $good = false;
 451                                 }
 452                         }
 453                 }
 454
 455                 $this->setVar( '_Environment', $good );
 456
 457                 return $good ? Status::newGood() : Status::newFatal( 'config-env-bad' );
 458         }
 459
 460         public function doEnvironmentPreps() {
 461                 foreach ( $this->envPreps as $prep ) {
 462                         $this->$prep();
 463                 }
 464         }
 465
 466         /**
 467          * Set a MW configuration variable, or internal installer configuration variable.
 468          *
 469          * @param string $name
 470          * @param mixed $value
 471          */
 472         public function setVar( $name, $value ) {
 473                 $this->settings[$name] = $value;
 474         }
 475
 476         /**
 477          * Get an MW configuration variable, or internal installer configuration variable.
 478          * The defaults come from $GLOBALS (ultimately DefaultSettings.php).
 479          * Installer variables are typically prefixed by an underscore.
 480          *
 481          * @param string $name
 482          * @param mixed $default
 483          *
 484          * @return mixed
 485          */
 486         public function getVar( $name, $default = null ) {
 487                 if ( !isset( $this->settings[$name] ) ) {
 488                         return $default;
 489                 } else {
 490                         return $this->settings[$name];
 491                 }
 492         }
 493
 494         /**
 495          * Get a list of DBs supported by current PHP setup
 496          *
 497          * @return array
 498          */
 499         public function getCompiledDBs() {
 500                 return $this->compiledDBs;
 501         }
 502
 503         /**
 504          * Get an instance of DatabaseInstaller for the specified DB type.
 505          *
 506          * @param mixed $type DB installer for which is needed, false to use default.
 507          *
 508          * @return DatabaseInstaller
 509          */
 510         public function getDBInstaller( $type = false ) {
 511                 if ( !$type ) {
 512                         $type = $this->getVar( 'wgDBtype' );
 513                 }
 514
 515                 $type = strtolower( $type );
 516
 517                 if ( !isset( $this->dbInstallers[$type] ) ) {
 518                         $class = ucfirst( $type ) . 'Installer';
 519                         $this->dbInstallers[$type] = new $class( $this );
 520                 }
 521
 522                 return $this->dbInstallers[$type];
 523         }
 524
 525         /**
 526          * Determine if LocalSettings.php exists. If it does, return its variables.
 527          *
 528          * @return array
 529          */
 530         public static function getExistingLocalSettings() {
 531                 global $IP;
 532
 533                 // You might be wondering why this is here. Well if you don't do this
 534                 // then some poorly-formed extensions try to call their own classes
 535                 // after immediately registering them. We really need to get extension
 536                 // registration out of the global scope and into a real format.
 537                 // @see https://phabricator.wikimedia.org/T69440
 538                 global $wgAutoloadClasses;
 539                 $wgAutoloadClasses = array();
 540
 541                 // @codingStandardsIgnoreStart
 542                 // LocalSettings.php should not call functions, except wfLoadSkin/wfLoadExtensions
 543                 // Define the required globals here, to ensure, the functions can do it work correctly.
 544                 global $wgExtensionDirectory, $wgStyleDirectory;
 545                 // @codingStandardsIgnoreEnd
 546
 547                 MediaWiki\suppressWarnings();
 548                 $_lsExists = file_exists( "$IP/LocalSettings.php" );
 549                 MediaWiki\restoreWarnings();
 550
 551                 if ( !$_lsExists ) {
 552                         return false;
 553                 }
 554                 unset( $_lsExists );
 555
 556                 require "$IP/includes/DefaultSettings.php";
 557                 require "$IP/LocalSettings.php";
 558
 559                 return get_defined_vars();
 560         }
 561
 562         /**
 563          * Get a fake password for sending back to the user in HTML.
 564          * This is a security mechanism to avoid compromise of the password in the
 565          * event of session ID compromise.
 566          *
 567          * @param string $realPassword
 568          *
 569          * @return string
 570          */
 571         public function getFakePassword( $realPassword ) {
 572                 return str_repeat( '*', strlen( $realPassword ) );
 573         }
 574
 575         /**
 576          * Set a variable which stores a password, except if the new value is a
 577          * fake password in which case leave it as it is.
 578          *
 579          * @param string $name
 580          * @param mixed $value
 581          */
 582         public function setPassword( $name, $value ) {
 583                 if ( !preg_match( '/^\*+$/', $value ) ) {
 584                         $this->setVar( $name, $value );
 585                 }
 586         }
 587
 588         /**
 589          * On POSIX systems return the primary group of the webserver we're running under.
 590          * On other systems just returns null.
 591          *
 592          * This is used to advice the user that he should chgrp his mw-config/data/images directory as the
 593          * webserver user before he can install.
 594          *
 595          * Public because SqliteInstaller needs it, and doesn't subclass Installer.
 596          *
 597          * @return mixed
 598          */
 599         public static function maybeGetWebserverPrimaryGroup() {
 600                 if ( !function_exists( 'posix_getegid' ) || !function_exists( 'posix_getpwuid' ) ) {
 601                         # I don't know this, this isn't UNIX.
 602                         return null;
 603                 }
 604
 605                 # posix_getegid() *not* getmygid() because we want the group of the webserver,
 606                 # not whoever owns the current script.
 607                 $gid = posix_getegid();
 608                 $getpwuid = posix_getpwuid( $gid );
 609                 $group = $getpwuid['name'];
 610
 611                 return $group;
 612         }
 613
 614         /**
 615          * Convert wikitext $text to HTML.
 616          *
 617          * This is potentially error prone since many parser features require a complete
 618          * installed MW database. The solution is to just not use those features when you
 619          * write your messages. This appears to work well enough. Basic formatting and
 620          * external links work just fine.
 621          *
 622          * But in case a translator decides to throw in a "#ifexist" or internal link or
 623          * whatever, this function is guarded to catch the attempted DB access and to present
 624          * some fallback text.
 625          *
 626          * @param string $text
 627          * @param bool $lineStart
 628          * @return string
 629          */
 630         public function parse( $text, $lineStart = false ) {
 631                 global $wgParser;
 632
 633                 try {
 634                         $out = $wgParser->parse( $text, $this->parserTitle, $this->parserOptions, $lineStart );
 635                         $html = $out->getText();
 636                 } catch ( DBAccessError $e ) {
 637                         $html = '<!--DB access attempted during parse-->  ' . htmlspecialchars( $text );
 638
 639                         if ( !empty( $this->debug ) ) {
 640                                 $html .= "<!--\n" . $e->getTraceAsString() . "\n-->";
 641                         }
 642                 }
 643
 644                 return $html;
 645         }
 646
 647         /**
 648          * @return ParserOptions
 649          */
 650         public function getParserOptions() {
 651                 return $this->parserOptions;
 652         }
 653
 654         public function disableLinkPopups() {
 655                 $this->parserOptions->setExternalLinkTarget( false );
 656         }
 657
 658         public function restoreLinkPopups() {
 659                 global $wgExternalLinkTarget;
 660                 $this->parserOptions->setExternalLinkTarget( $wgExternalLinkTarget );
 661         }
 662
 663         /**
 664          * Install step which adds a row to the site_stats table with appropriate
 665          * initial values.
 666          *
 667          * @param DatabaseInstaller $installer
 668          *
 669          * @return Status
 670          */
 671         public function populateSiteStats( DatabaseInstaller $installer ) {
 672                 $status = $installer->getConnection();
 673                 if ( !$status->isOK() ) {
 674                         return $status;
 675                 }
 676                 $status->value->insert(
 677                         'site_stats',
 678                         array(
 679                                 'ss_row_id' => 1,
 680                                 'ss_total_edits' => 0,
 681                                 'ss_good_articles' => 0,
 682                                 'ss_total_pages' => 0,
 683                                 'ss_users' => 0,
 684                                 'ss_images' => 0
 685                         ),
 686                         __METHOD__, 'IGNORE'
 687                 );
 688
 689                 return Status::newGood();
 690         }
 691
 692         /**
 693          * Exports all wg* variables stored by the installer into global scope.
 694          */
 695         public function exportVars() {
 696                 foreach ( $this->settings as $name => $value ) {
 697                         if ( substr( $name, 0, 2 ) == 'wg' ) {
 698                                 $GLOBALS[$name] = $value;
 699                         }
 700                 }
 701         }
 702
 703         /**
 704          * Environment check for DB types.
 705          * @return bool
 706          */
 707         protected function envCheckDB() {
 708                 global $wgLang;
 709
 710                 $allNames = array();
 711
 712                 // Messages: config-type-mysql, config-type-postgres, config-type-oracle,
 713                 // config-type-sqlite
 714                 foreach ( self::getDBTypes() as $name ) {
 715                         $allNames[] = wfMessage( "config-type-$name" )->text();
 716                 }
 717
 718                 $databases = $this->getCompiledDBs();
 719
 720                 $databases = array_flip( $databases );
 721                 foreach ( array_keys( $databases ) as $db ) {
 722                         $installer = $this->getDBInstaller( $db );
 723                         $status = $installer->checkPrerequisites();
 724                         if ( !$status->isGood() ) {
 725                                 $this->showStatusMessage( $status );
 726                         }
 727                         if ( !$status->isOK() ) {
 728                                 unset( $databases[$db] );
 729                         }
 730                 }
 731                 $databases = array_flip( $databases );
 732                 if ( !$databases ) {
 733                         $this->showError( 'config-no-db', $wgLang->commaList( $allNames ), count( $allNames ) );
 734
 735                         // @todo FIXME: This only works for the web installer!
 736                         return false;
 737                 }
 738
 739                 return true;
 740         }
 741
 742         /**
 743          * Environment check for register_globals.
 744          * Prevent installation if enabled
 745          * @return bool
 746          */
 747         protected function envCheckRegisterGlobals() {
 748                 if ( wfIniGetBool( 'register_globals' ) ) {
 749                         $this->showMessage( 'config-register-globals-error' );
 750                         return false;
 751                 }
 752
 753                 return true;
 754         }
 755
 756         /**
 757          * Some versions of libxml+PHP break < and > encoding horribly
 758          * @return bool
 759          */
 760         protected function envCheckBrokenXML() {
 761                 $test = new PhpXmlBugTester();
 762                 if ( !$test->ok ) {
 763                         $this->showError( 'config-brokenlibxml' );
 764
 765                         return false;
 766                 }
 767
 768                 return true;
 769         }
 770
 771         /**
 772          * Environment check for magic_quotes_(gpc|runtime|sybase).
 773          * @return bool
 774          */
 775         protected function envCheckMagicQuotes() {
 776                 $status = true;
 777                 foreach ( array( 'gpc', 'runtime', 'sybase' ) as $magicJunk ) {
 778                         if ( wfIniGetBool( "magic_quotes_$magicJunk" ) ) {
 779                                 $this->showError( "config-magic-quotes-$magicJunk" );
 780                                 $status = false;
 781                         }
 782                 }
 783
 784                 return $status;
 785         }
 786
 787         /**
 788          * Environment check for mbstring.func_overload.
 789          * @return bool
 790          */
 791         protected function envCheckMbstring() {
 792                 if ( wfIniGetBool( 'mbstring.func_overload' ) ) {
 793                         $this->showError( 'config-mbstring' );
 794
 795                         return false;
 796                 }
 797
 798                 return true;
 799         }
 800
 801         /**
 802          * Environment check for safe_mode.
 803          * @return bool
 804          */
 805         protected function envCheckSafeMode() {
 806                 if ( wfIniGetBool( 'safe_mode' ) ) {
 807                         $this->setVar( '_SafeMode', true );
 808                         $this->showMessage( 'config-safe-mode' );
 809                 }
 810
 811                 return true;
 812         }
 813
 814         /**
 815          * Environment check for the XML module.
 816          * @return bool
 817          */
 818         protected function envCheckXML() {
 819                 if ( !function_exists( "utf8_encode" ) ) {
 820                         $this->showError( 'config-xml-bad' );
 821
 822                         return false;
 823                 }
 824
 825                 return true;
 826         }
 827
 828         /**
 829          * Environment check for the PCRE module.
 830          *
 831          * @note If this check were to fail, the parser would
 832          *   probably throw an exception before the result
 833          *   of this check is shown to the user.
 834          * @return bool
 835          */
 836         protected function envCheckPCRE() {
 837                 MediaWiki\suppressWarnings();
 838                 $regexd = preg_replace( '/[\x{0430}-\x{04FF}]/iu', '', '-АБВГД-' );
 839                 // Need to check for \p support too, as PCRE can be compiled
 840                 // with utf8 support, but not unicode property support.
 841                 // check that \p{Zs} (space separators) matches
 842                 // U+3000 (Ideographic space)
 843                 $regexprop = preg_replace( '/\p{Zs}/u', '', "-\xE3\x80\x80-" );
 844                 MediaWiki\restoreWarnings();
 845                 if ( $regexd != '--' || $regexprop != '--' ) {
 846                         $this->showError( 'config-pcre-no-utf8' );
 847
 848                         return false;
 849                 }
 850
 851                 return true;
 852         }
 853
 854         /**
 855          * Environment check for available memory.
 856          * @return bool
 857          */
 858         protected function envCheckMemory() {
 859                 $limit = ini_get( 'memory_limit' );
 860
 861                 if ( !$limit || $limit == -1 ) {
 862                         return true;
 863                 }
 864
 865                 $n = wfShorthandToInteger( $limit );
 866
 867                 if ( $n < $this->minMemorySize * 1024 * 1024 ) {
 868                         $newLimit = "{$this->minMemorySize}M";
 869
 870                         if ( ini_set( "memory_limit", $newLimit ) === false ) {
 871                                 $this->showMessage( 'config-memory-bad', $limit );
 872                         } else {
 873                                 $this->showMessage( 'config-memory-raised', $limit, $newLimit );
 874                                 $this->setVar( '_RaiseMemory', true );
 875                         }
 876                 }
 877
 878                 return true;
 879         }
 880
 881         /**
 882          * Environment check for compiled object cache types.
 883          */
 884         protected function envCheckCache() {
 885                 $caches = array();
 886                 foreach ( $this->objectCaches as $name => $function ) {
 887                         if ( function_exists( $function ) ) {
 888                                 if ( $name == 'xcache' && !wfIniGetBool( 'xcache.var_size' ) ) {
 889                                         continue;
 890                                 }
 891                                 $caches[$name] = true;
 892                         }
 893                 }
 894
 895                 if ( !$caches ) {
 896                         $this->showMessage( 'config-no-cache' );
 897                 }
 898
 899                 $this->setVar( '_Caches', $caches );
 900         }
 901
 902         /**
 903          * Scare user to death if they have mod_security or mod_security2
 904          * @return bool
 905          */
 906         protected function envCheckModSecurity() {
 907                 if ( self::apacheModulePresent( 'mod_security' )
 908                         || self::apacheModulePresent( 'mod_security2' ) ) {
 909                         $this->showMessage( 'config-mod-security' );
 910                 }
 911
 912                 return true;
 913         }
 914
 915         /**
 916          * Search for GNU diff3.
 917          * @return bool
 918          */
 919         protected function envCheckDiff3() {
 920                 $names = array( "gdiff3", "diff3", "diff3.exe" );
 921                 $versionInfo = array( '$1 --version 2>&1', 'GNU diffutils' );
 922
 923                 $diff3 = self::locateExecutableInDefaultPaths( $names, $versionInfo );
 924
 925                 if ( $diff3 ) {
 926                         $this->setVar( 'wgDiff3', $diff3 );
 927                 } else {
 928                         $this->setVar( 'wgDiff3', false );
 929                         $this->showMessage( 'config-diff3-bad' );
 930                 }
 931
 932                 return true;
 933         }
 934
 935         /**
 936          * Environment check for ImageMagick and GD.
 937          * @return bool
 938          */
 939         protected function envCheckGraphics() {
 940                 $names = array( wfIsWindows() ? 'convert.exe' : 'convert' );
 941                 $versionInfo = array( '$1 -version', 'ImageMagick' );
 942                 $convert = self::locateExecutableInDefaultPaths( $names, $versionInfo );
 943
 944                 $this->setVar( 'wgImageMagickConvertCommand', '' );
 945                 if ( $convert ) {
 946                         $this->setVar( 'wgImageMagickConvertCommand', $convert );
 947                         $this->showMessage( 'config-imagemagick', $convert );
 948
 949                         return true;
 950                 } elseif ( function_exists( 'imagejpeg' ) ) {
 951                         $this->showMessage( 'config-gd' );
 952                 } else {
 953                         $this->showMessage( 'config-no-scaling' );
 954                 }
 955
 956                 return true;
 957         }
 958
 959         /**
 960          * Search for git.
 961          *
 962          * @since 1.22
 963          * @return bool
 964          */
 965         protected function envCheckGit() {
 966                 $names = array( wfIsWindows() ? 'git.exe' : 'git' );
 967                 $versionInfo = array( '$1 --version', 'git version' );
 968
 969                 $git = self::locateExecutableInDefaultPaths( $names, $versionInfo );
 970
 971                 if ( $git ) {
 972                         $this->setVar( 'wgGitBin', $git );
 973                         $this->showMessage( 'config-git', $git );
 974                 } else {
 975                         $this->setVar( 'wgGitBin', false );
 976                         $this->showMessage( 'config-git-bad' );
 977                 }
 978
 979                 return true;
 980         }
 981
 982         /**
 983          * Environment check to inform user which server we've assumed.
 984          *
 985          * @return bool
 986          */
 987         protected function envCheckServer() {
 988                 $server = $this->envGetDefaultServer();
 989                 if ( $server !== null ) {
 990                         $this->showMessage( 'config-using-server', $server );
 991                 }
 992                 return true;
 993         }
 994
 995         /**
 996          * Environment check to inform user which paths we've assumed.
 997          *
 998          * @return bool
 999          */
1000         protected function envCheckPath() {
1001                 $this->showMessage(
1002                         'config-using-uri',
1003                         $this->getVar( 'wgServer' ),
1004                         $this->getVar( 'wgScriptPath' )
1005                 );
1006                 return true;
1007         }
1008
1009         /**
1010          * Environment check for preferred locale in shell
1011          * @return bool
1012          */
1013         protected function envCheckShellLocale() {
1014                 $os = php_uname( 's' );
1015                 $supported = array( 'Linux', 'SunOS', 'HP-UX', 'Darwin' ); # Tested these
1016
1017                 if ( !in_array( $os, $supported ) ) {
1018                         return true;
1019                 }
1020
1021                 # Get a list of available locales.
1022                 $ret = false;
1023                 $lines = wfShellExec( '/usr/bin/locale -a', $ret );
1024
1025                 if ( $ret ) {
1026                         return true;
1027                 }
1028
1029                 $lines = array_map( 'trim', explode( "\n", $lines ) );
1030                 $candidatesByLocale = array();
1031                 $candidatesByLang = array();
1032
1033                 foreach ( $lines as $line ) {
1034                         if ( $line === '' ) {
1035                                 continue;
1036                         }
1037
1038                         if ( !preg_match( '/^([a-zA-Z]+)(_[a-zA-Z]+|)\.(utf8|UTF-8)(@[a-zA-Z_]*|)$/i', $line, $m ) ) {
1039                                 continue;
1040                         }
1041
1042                         list( , $lang, , , ) = $m;
1043
1044                         $candidatesByLocale[$m[0]] = $m;
1045                         $candidatesByLang[$lang][] = $m;
1046                 }
1047
1048                 # Try the current value of LANG.
1049                 if ( isset( $candidatesByLocale[getenv( 'LANG' )] ) ) {
1050                         $this->setVar( 'wgShellLocale', getenv( 'LANG' ) );
1051
1052                         return true;
1053                 }
1054
1055                 # Try the most common ones.
1056                 $commonLocales = array( 'en_US.UTF-8', 'en_US.utf8', 'de_DE.UTF-8', 'de_DE.utf8' );
1057                 foreach ( $commonLocales as $commonLocale ) {
1058                         if ( isset( $candidatesByLocale[$commonLocale] ) ) {
1059                                 $this->setVar( 'wgShellLocale', $commonLocale );
1060
1061                                 return true;
1062                         }
1063                 }
1064
1065                 # Is there an available locale in the Wiki's language?
1066                 $wikiLang = $this->getVar( 'wgLanguageCode' );
1067
1068                 if ( isset( $candidatesByLang[$wikiLang] ) ) {
1069                         $m = reset( $candidatesByLang[$wikiLang] );
1070                         $this->setVar( 'wgShellLocale', $m[0] );
1071
1072                         return true;
1073                 }
1074
1075                 # Are there any at all?
1076                 if ( count( $candidatesByLocale ) ) {
1077                         $m = reset( $candidatesByLocale );
1078                         $this->setVar( 'wgShellLocale', $m[0] );
1079
1080                         return true;
1081                 }
1082
1083                 # Give up.
1084                 return true;
1085         }
1086
1087         /**
1088          * Environment check for the permissions of the uploads directory
1089          * @return bool
1090          */
1091         protected function envCheckUploadsDirectory() {
1092                 global $IP;
1093
1094                 $dir = $IP . '/images/';
1095                 $url = $this->getVar( 'wgServer' ) . $this->getVar( 'wgScriptPath' ) . '/images/';
1096                 $safe = !$this->dirIsExecutable( $dir, $url );
1097
1098                 if ( !$safe ) {
1099                         $this->showMessage( 'config-uploads-not-safe', $dir );
1100                 }
1101
1102                 return true;
1103         }
1104
1105         /**
1106          * Checks if suhosin.get.max_value_length is set, and if so generate
1107          * a warning because it decreases ResourceLoader performance.
1108          * @return bool
1109          */
1110         protected function envCheckSuhosinMaxValueLength() {
1111                 $maxValueLength = ini_get( 'suhosin.get.max_value_length' );
1112                 if ( $maxValueLength > 0 && $maxValueLength < 1024 ) {
1113                         // Only warn if the value is below the sane 1024
1114                         $this->showMessage( 'config-suhosin-max-value-length', $maxValueLength );
1115                 }
1116
1117                 return true;
1118         }
1119
1120         /**
1121          * Convert a hex string representing a Unicode code point to that code point.
1122          * @param string $c
1123          * @return string
1124          */
1125         protected function unicodeChar( $c ) {
1126                 $c = hexdec( $c );
1127                 if ( $c <= 0x7F ) {
1128                         return chr( $c );
1129                 } elseif ( $c <= 0x7FF ) {
1130                         return chr( 0xC0 | $c >> 6 ) . chr( 0x80 | $c & 0x3F );
1131                 } elseif ( $c <= 0xFFFF ) {
1132                         return chr( 0xE0 | $c >> 12 ) . chr( 0x80 | $c >> 6 & 0x3F ) .
1133                                 chr( 0x80 | $c & 0x3F );
1134                 } elseif ( $c <= 0x10FFFF ) {
1135                         return chr( 0xF0 | $c >> 18 ) . chr( 0x80 | $c >> 12 & 0x3F ) .
1136                                 chr( 0x80 | $c >> 6 & 0x3F ) .
1137                                 chr( 0x80 | $c & 0x3F );
1138                 } else {
1139                         return false;
1140                 }
1141         }
1142
1143         /**
1144          * Check the libicu version
1145          */
1146         protected function envCheckLibicu() {
1147                 /**
1148                  * This needs to be updated something that the latest libicu
1149                  * will properly normalize.  This normalization was found at
1150                  * http://www.unicode.org/versions/Unicode5.2.0/#Character_Additions
1151                  * Note that we use the hex representation to create the code
1152                  * points in order to avoid any Unicode-destroying during transit.
1153                  */
1154                 $not_normal_c = $this->unicodeChar( "FA6C" );
1155                 $normal_c = $this->unicodeChar( "242EE" );
1156
1157                 $useNormalizer = 'php';
1158                 $needsUpdate = false;
1159
1160                 if ( function_exists( 'normalizer_normalize' ) ) {
1161                         $useNormalizer = 'intl';
1162                         $intl = normalizer_normalize( $not_normal_c, Normalizer::FORM_C );
1163                         if ( $intl !== $normal_c ) {
1164                                 $needsUpdate = true;
1165                         }
1166                 }
1167
1168                 // Uses messages 'config-unicode-using-php' and 'config-unicode-using-intl'
1169                 if ( $useNormalizer === 'php' ) {
1170                         $this->showMessage( 'config-unicode-pure-php-warning' );
1171                 } else {
1172                         $this->showMessage( 'config-unicode-using-' . $useNormalizer );
1173                         if ( $needsUpdate ) {
1174                                 $this->showMessage( 'config-unicode-update-warning' );
1175                         }
1176                 }
1177         }
1178
1179         /**
1180          * @return bool
1181          */
1182         protected function envCheckCtype() {
1183                 if ( !function_exists( 'ctype_digit' ) ) {
1184                         $this->showError( 'config-ctype' );
1185
1186                         return false;
1187                 }
1188
1189                 return true;
1190         }
1191
1192         /**
1193          * @return bool
1194          */
1195         protected function envCheckIconv() {
1196                 if ( !function_exists( 'iconv' ) ) {
1197                         $this->showError( 'config-iconv' );
1198
1199                         return false;
1200                 }
1201
1202                 return true;
1203         }
1204
1205         /**
1206          * @return bool
1207          */
1208         protected function envCheckJSON() {
1209                 if ( !function_exists( 'json_decode' ) ) {
1210                         $this->showError( 'config-json' );
1211
1212                         return false;
1213                 }
1214
1215                 return true;
1216         }
1217
1218         /**
1219          * Environment prep for the server hostname.
1220          */
1221         protected function envPrepServer() {
1222                 $server = $this->envGetDefaultServer();
1223                 if ( $server !== null ) {
1224                         $this->setVar( 'wgServer', $server );
1225                 }
1226         }
1227
1228         /**
1229          * Helper function to be called from envPrepServer()
1230          * @return string
1231          */
1232         abstract protected function envGetDefaultServer();
1233
1234         /**
1235          * Environment prep for setting $IP and $wgScriptPath.
1236          */
1237         protected function envPrepPath() {
1238                 global $IP;
1239                 $IP = dirname( dirname( __DIR__ ) );
1240                 $this->setVar( 'IP', $IP );
1241         }
1242
1243         /**
1244          * Get an array of likely places we can find executables. Check a bunch
1245          * of known Unix-like defaults, as well as the PATH environment variable
1246          * (which should maybe make it work for Windows?)
1247          *
1248          * @return array
1249          */
1250         protected static function getPossibleBinPaths() {
1251                 return array_merge(
1252                         array( '/usr/bin', '/usr/local/bin', '/opt/csw/bin',
1253                                 '/usr/gnu/bin', '/usr/sfw/bin', '/sw/bin', '/opt/local/bin' ),
1254                         explode( PATH_SEPARATOR, getenv( 'PATH' ) )
1255                 );
1256         }
1257
1258         /**
1259          * Search a path for any of the given executable names. Returns the
1260          * executable name if found. Also checks the version string returned
1261          * by each executable.
1262          *
1263          * Used only by environment checks.
1264          *
1265          * @param string $path Path to search
1266          * @param array $names Array of executable names
1267          * @param array|bool $versionInfo False or array with two members:
1268          *   0 => Command to run for version check, with $1 for the full executable name
1269          *   1 => String to compare the output with
1270          *
1271          * If $versionInfo is not false, only executables with a version
1272          * matching $versionInfo[1] will be returned.
1273          * @return bool|string
1274          */
1275         public static function locateExecutable( $path, $names, $versionInfo = false ) {
1276                 if ( !is_array( $names ) ) {
1277                         $names = array( $names );
1278                 }
1279
1280                 foreach ( $names as $name ) {
1281                         $command = $path . DIRECTORY_SEPARATOR . $name;
1282
1283                         MediaWiki\suppressWarnings();
1284                         $file_exists = file_exists( $command );
1285                         MediaWiki\restoreWarnings();
1286
1287                         if ( $file_exists ) {
1288                                 if ( !$versionInfo ) {
1289                                         return $command;
1290                                 }
1291
1292                                 $file = str_replace( '$1', wfEscapeShellArg( $command ), $versionInfo[0] );
1293                                 if ( strstr( wfShellExec( $file ), $versionInfo[1] ) !== false ) {
1294                                         return $command;
1295                                 }
1296                         }
1297                 }
1298
1299                 return false;
1300         }
1301
1302         /**
1303          * Same as locateExecutable(), but checks in getPossibleBinPaths() by default
1304          * @see locateExecutable()
1305          * @param array $names Array of possible names.
1306          * @param array|bool $versionInfo Default: false or array with two members:
1307          *   0 => Command to run for version check, with $1 for the full executable name
1308          *   1 => String to compare the output with
1309          *
1310          * If $versionInfo is not false, only executables with a version
1311          * matching $versionInfo[1] will be returned.
1312          * @return bool|string
1313          */
1314         public static function locateExecutableInDefaultPaths( $names, $versionInfo = false ) {
1315                 foreach ( self::getPossibleBinPaths() as $path ) {
1316                         $exe = self::locateExecutable( $path, $names, $versionInfo );
1317                         if ( $exe !== false ) {
1318                                 return $exe;
1319                         }
1320                 }
1321
1322                 return false;
1323         }
1324
1325         /**
1326          * Checks if scripts located in the given directory can be executed via the given URL.
1327          *
1328          * Used only by environment checks.
1329          * @param string $dir
1330          * @param string $url
1331          * @return bool|int|string
1332          */
1333         public function dirIsExecutable( $dir, $url ) {
1334                 $scriptTypes = array(
1335                         'php' => array(
1336                                 "<?php echo 'ex' . 'ec';",
1337                                 "#!/var/env php5\n<?php echo 'ex' . 'ec';",
1338                         ),
1339                 );
1340
1341                 // it would be good to check other popular languages here, but it'll be slow.
1342
1343                 MediaWiki\suppressWarnings();
1344
1345                 foreach ( $scriptTypes as $ext => $contents ) {
1346                         foreach ( $contents as $source ) {
1347                                 $file = 'exectest.' . $ext;
1348
1349                                 if ( !file_put_contents( $dir . $file, $source ) ) {
1350                                         break;
1351                                 }
1352
1353                                 try {
1354                                         $text = Http::get( $url . $file, array( 'timeout' => 3 ), __METHOD__ );
1355                                 } catch ( Exception $e ) {
1356                                         // Http::get throws with allow_url_fopen = false and no curl extension.
1357                                         $text = null;
1358                                 }
1359                                 unlink( $dir . $file );
1360
1361                                 if ( $text == 'exec' ) {
1362                                         MediaWiki\restoreWarnings();
1363
1364                                         return $ext;
1365                                 }
1366                         }
1367                 }
1368
1369                 MediaWiki\restoreWarnings();
1370
1371                 return false;
1372         }
1373
1374         /**
1375          * Checks for presence of an Apache module. Works only if PHP is running as an Apache module, too.
1376          *
1377          * @param string $moduleName Name of module to check.
1378          * @return bool
1379          */
1380         public static function apacheModulePresent( $moduleName ) {
1381                 if ( function_exists( 'apache_get_modules' ) && in_array( $moduleName, apache_get_modules() ) ) {
1382                         return true;
1383                 }
1384                 // try it the hard way
1385                 ob_start();
1386                 phpinfo( INFO_MODULES );
1387                 $info = ob_get_clean();
1388
1389                 return strpos( $info, $moduleName ) !== false;
1390         }
1391
1392         /**
1393          * ParserOptions are constructed before we determined the language, so fix it
1394          *
1395          * @param Language $lang
1396          */
1397         public function setParserLanguage( $lang ) {
1398                 $this->parserOptions->setTargetLanguage( $lang );
1399                 $this->parserOptions->setUserLang( $lang );
1400         }
1401
1402         /**
1403          * Overridden by WebInstaller to provide lastPage parameters.
1404          * @param string $page
1405          * @return string
1406          */
1407         protected function getDocUrl( $page ) {
1408                 return "{$_SERVER['PHP_SELF']}?page=" . urlencode( $page );
1409         }
1410
1411         /**
1412          * Finds extensions that follow the format /$directory/Name/Name.php,
1413          * and returns an array containing the value for 'Name' for each found extension.
1414          *
1415          * Reasonable values for $directory include 'extensions' (the default) and 'skins'.
1416          *
1417          * @param string $directory Directory to search in
1418          * @return array
1419          */
1420         public function findExtensions( $directory = 'extensions' ) {
1421                 if ( $this->getVar( 'IP' ) === null ) {
1422                         return array();
1423                 }
1424
1425                 $extDir = $this->getVar( 'IP' ) . '/' . $directory;
1426                 if ( !is_readable( $extDir ) || !is_dir( $extDir ) ) {
1427                         return array();
1428                 }
1429
1430                 // extensions -> extension.json, skins -> skin.json
1431                 $jsonFile = substr( $directory, 0, strlen( $directory ) -1 ) . '.json';
1432
1433                 $dh = opendir( $extDir );
1434                 $exts = array();
1435                 while ( ( $file = readdir( $dh ) ) !== false ) {
1436                         if ( !is_dir( "$extDir/$file" ) ) {
1437                                 continue;
1438                         }
1439                         if ( file_exists( "$extDir/$file/$jsonFile" ) || file_exists( "$extDir/$file/$file.php" ) ) {
1440                                 $exts[] = $file;
1441                         }
1442                 }
1443                 closedir( $dh );
1444                 natcasesort( $exts );
1445
1446                 return $exts;
1447         }
1448
1449         /**
1450          * Returns a default value to be used for $wgDefaultSkin: normally the one set in DefaultSettings,
1451          * but will fall back to another if the default skin is missing and some other one is present
1452          * instead.
1453          *
1454          * @param string[] $skinNames Names of installed skins.
1455          * @return string
1456          */
1457         public function getDefaultSkin( array $skinNames ) {
1458                 $defaultSkin = $GLOBALS['wgDefaultSkin'];
1459                 if ( !$skinNames || in_array( $defaultSkin, $skinNames ) ) {
1460                         return $defaultSkin;
1461                 } else {
1462                         return $skinNames[0];
1463                 }
1464         }
1465
1466         /**
1467          * Installs the auto-detected extensions.
1468          *
1469          * @return Status
1470          */
1471         protected function includeExtensions() {
1472                 global $IP;
1473                 $exts = $this->getVar( '_Extensions' );
1474                 $IP = $this->getVar( 'IP' );
1475
1476                 /**
1477                  * We need to include DefaultSettings before including extensions to avoid
1478                  * warnings about unset variables. However, the only thing we really
1479                  * want here is $wgHooks['LoadExtensionSchemaUpdates']. This won't work
1480                  * if the extension has hidden hook registration in $wgExtensionFunctions,
1481                  * but we're not opening that can of worms
1482                  * @see https://phabricator.wikimedia.org/T28857
1483                  */
1484                 global $wgAutoloadClasses;
1485                 $wgAutoloadClasses = array();
1486                 $queue = array();
1487
1488                 require "$IP/includes/DefaultSettings.php";
1489
1490                 foreach ( $exts as $e ) {
1491                         if ( file_exists( "$IP/extensions/$e/extension.json" ) ) {
1492                                 $queue["$IP/extensions/$e/extension.json"] = 1;
1493                         } else {
1494                                 require_once "$IP/extensions/$e/$e.php";
1495                         }
1496                 }
1497
1498                 $registry = new ExtensionRegistry();
1499                 $data = $registry->readFromQueue( $queue );
1500                 $wgAutoloadClasses += $data['autoload'];
1501
1502                 $hooksWeWant = isset( $wgHooks['LoadExtensionSchemaUpdates'] ) ?
1503                         $wgHooks['LoadExtensionSchemaUpdates'] : array();
1504
1505                 if ( isset( $data['globals']['wgHooks']['LoadExtensionSchemaUpdates'] ) ) {
1506                         $hooksWeWant = array_merge_recursive(
1507                                 $hooksWeWant,
1508                                 $data['globals']['wgHooks']['LoadExtensionSchemaUpdates']
1509                         );
1510                 }
1511                 // Unset everyone else's hooks. Lord knows what someone might be doing
1512                 // in ParserFirstCallInit (see bug 27171)
1513                 $GLOBALS['wgHooks'] = array( 'LoadExtensionSchemaUpdates' => $hooksWeWant );
1514
1515                 return Status::newGood();
1516         }
1517
1518         /**
1519          * Get an array of install steps. Should always be in the format of
1520          * array(
1521          *   'name'     => 'someuniquename',
1522          *   'callback' => array( $obj, 'method' ),
1523          * )
1524          * There must be a config-install-$name message defined per step, which will
1525          * be shown on install.
1526          *
1527          * @param DatabaseInstaller $installer DatabaseInstaller so we can make callbacks
1528          * @return array
1529          */
1530         protected function getInstallSteps( DatabaseInstaller $installer ) {
1531                 $coreInstallSteps = array(
1532                         array( 'name' => 'database', 'callback' => array( $installer, 'setupDatabase' ) ),
1533                         array( 'name' => 'tables', 'callback' => array( $installer, 'createTables' ) ),
1534                         array( 'name' => 'interwiki', 'callback' => array( $installer, 'populateInterwikiTable' ) ),
1535                         array( 'name' => 'stats', 'callback' => array( $this, 'populateSiteStats' ) ),
1536                         array( 'name' => 'keys', 'callback' => array( $this, 'generateKeys' ) ),
1537                         array( 'name' => 'updates', 'callback' => array( $installer, 'insertUpdateKeys' ) ),
1538                         array( 'name' => 'sysop', 'callback' => array( $this, 'createSysop' ) ),
1539                         array( 'name' => 'mainpage', 'callback' => array( $this, 'createMainpage' ) ),
1540                 );
1541
1542                 // Build the array of install steps starting from the core install list,
1543                 // then adding any callbacks that wanted to attach after a given step
1544                 foreach ( $coreInstallSteps as $step ) {
1545                         $this->installSteps[] = $step;
1546                         if ( isset( $this->extraInstallSteps[$step['name']] ) ) {
1547                                 $this->installSteps = array_merge(
1548                                         $this->installSteps,
1549                                         $this->extraInstallSteps[$step['name']]
1550                                 );
1551                         }
1552                 }
1553
1554                 // Prepend any steps that want to be at the beginning
1555                 if ( isset( $this->extraInstallSteps['BEGINNING'] ) ) {
1556                         $this->installSteps = array_merge(
1557                                 $this->extraInstallSteps['BEGINNING'],
1558                                 $this->installSteps
1559                         );
1560                 }
1561
1562                 // Extensions should always go first, chance to tie into hooks and such
1563                 if ( count( $this->getVar( '_Extensions' ) ) ) {
1564                         array_unshift( $this->installSteps,
1565                                 array( 'name' => 'extensions', 'callback' => array( $this, 'includeExtensions' ) )
1566                         );
1567                         $this->installSteps[] = array(
1568                                 'name' => 'extension-tables',
1569                                 'callback' => array( $installer, 'createExtensionTables' )
1570                         );
1571                 }
1572
1573                 return $this->installSteps;
1574         }
1575
1576         /**
1577          * Actually perform the installation.
1578          *
1579          * @param callable $startCB A callback array for the beginning of each step
1580          * @param callable $endCB A callback array for the end of each step
1581          *
1582          * @return array Array of Status objects
1583          */
1584         public function performInstallation( $startCB, $endCB ) {
1585                 $installResults = array();
1586                 $installer = $this->getDBInstaller();
1587                 $installer->preInstall();
1588                 $steps = $this->getInstallSteps( $installer );
1589                 foreach ( $steps as $stepObj ) {
1590                         $name = $stepObj['name'];
1591                         call_user_func_array( $startCB, array( $name ) );
1592
1593                         // Perform the callback step
1594                         $status = call_user_func( $stepObj['callback'], $installer );
1595
1596                         // Output and save the results
1597                         call_user_func( $endCB, $name, $status );
1598                         $installResults[$name] = $status;
1599
1600                         // If we've hit some sort of fatal, we need to bail.
1601                         // Callback already had a chance to do output above.
1602                         if ( !$status->isOk() ) {
1603                                 break;
1604                         }
1605                 }
1606                 if ( $status->isOk() ) {
1607                         $this->setVar( '_InstallDone', true );
1608                 }
1609
1610                 return $installResults;
1611         }
1612
1613         /**
1614          * Generate $wgSecretKey. Will warn if we had to use an insecure random source.
1615          *
1616          * @return Status
1617          */
1618         public function generateKeys() {
1619                 $keys = array( 'wgSecretKey' => 64 );
1620                 if ( strval( $this->getVar( 'wgUpgradeKey' ) ) === '' ) {
1621                         $keys['wgUpgradeKey'] = 16;
1622                 }
1623
1624                 return $this->doGenerateKeys( $keys );
1625         }
1626
1627         /**
1628          * Generate a secret value for variables using our CryptRand generator.
1629          * Produce a warning if the random source was insecure.
1630          *
1631          * @param array $keys
1632          * @return Status
1633          */
1634         protected function doGenerateKeys( $keys ) {
1635                 $status = Status::newGood();
1636
1637                 $strong = true;
1638                 foreach ( $keys as $name => $length ) {
1639                         $secretKey = MWCryptRand::generateHex( $length, true );
1640                         if ( !MWCryptRand::wasStrong() ) {
1641                                 $strong = false;
1642                         }
1643
1644                         $this->setVar( $name, $secretKey );
1645                 }
1646
1647                 if ( !$strong ) {
1648                         $names = array_keys( $keys );
1649                         $names = preg_replace( '/^(.*)$/', '\$$1', $names );
1650                         global $wgLang;
1651                         $status->warning( 'config-insecure-keys', $wgLang->listToText( $names ), count( $names ) );
1652                 }
1653
1654                 return $status;
1655         }
1656
1657         /**
1658          * Create the first user account, grant it sysop and bureaucrat rights
1659          *
1660          * @return Status
1661          */
1662         protected function createSysop() {
1663                 $name = $this->getVar( '_AdminName' );
1664                 $user = User::newFromName( $name );
1665
1666                 if ( !$user ) {
1667                         // We should've validated this earlier anyway!
1668                         return Status::newFatal( 'config-admin-error-user', $name );
1669                 }
1670
1671                 if ( $user->idForName() == 0 ) {
1672                         $user->addToDatabase();
1673
1674                         try {
1675                                 $user->setPassword( $this->getVar( '_AdminPassword' ) );
1676                         } catch ( PasswordError $pwe ) {
1677                                 return Status::newFatal( 'config-admin-error-password', $name, $pwe->getMessage() );
1678                         }
1679
1680                         $user->addGroup( 'sysop' );
1681                         $user->addGroup( 'bureaucrat' );
1682                         if ( $this->getVar( '_AdminEmail' ) ) {
1683                                 $user->setEmail( $this->getVar( '_AdminEmail' ) );
1684                         }
1685                         $user->saveSettings();
1686
1687                         // Update user count
1688                         $ssUpdate = new SiteStatsUpdate( 0, 0, 0, 0, 1 );
1689                         $ssUpdate->doUpdate();
1690                 }
1691                 $status = Status::newGood();
1692
1693                 if ( $this->getVar( '_Subscribe' ) && $this->getVar( '_AdminEmail' ) ) {
1694                         $this->subscribeToMediaWikiAnnounce( $status );
1695                 }
1696
1697                 return $status;
1698         }
1699
1700         /**
1701          * @param Status $s
1702          */
1703         private function subscribeToMediaWikiAnnounce( Status $s ) {
1704                 $params = array(
1705                         'email' => $this->getVar( '_AdminEmail' ),
1706                         'language' => 'en',
1707                         'digest' => 0
1708                 );
1709
1710                 // Mailman doesn't support as many languages as we do, so check to make
1711                 // sure their selected language is available
1712                 $myLang = $this->getVar( '_UserLang' );
1713                 if ( in_array( $myLang, $this->mediaWikiAnnounceLanguages ) ) {
1714                         $myLang = $myLang == 'pt-br' ? 'pt_BR' : $myLang; // rewrite to Mailman's pt_BR
1715                         $params['language'] = $myLang;
1716                 }
1717
1718                 if ( MWHttpRequest::canMakeRequests() ) {
1719                         $res = MWHttpRequest::factory( $this->mediaWikiAnnounceUrl,
1720                                 array( 'method' => 'POST', 'postData' => $params ), __METHOD__ )->execute();
1721                         if ( !$res->isOK() ) {
1722                                 $s->warning( 'config-install-subscribe-fail', $res->getMessage() );
1723                         }
1724                 } else {
1725                         $s->warning( 'config-install-subscribe-notpossible' );
1726                 }
1727         }
1728
1729         /**
1730          * Insert Main Page with default content.
1731          *
1732          * @param DatabaseInstaller $installer
1733          * @return Status
1734          */
1735         protected function createMainpage( DatabaseInstaller $installer ) {
1736                 $status = Status::newGood();
1737                 try {
1738                         $page = WikiPage::factory( Title::newMainPage() );
1739                         $content = new WikitextContent(
1740                                 wfMessage( 'mainpagetext' )->inContentLanguage()->text() . "\n\n" .
1741                                 wfMessage( 'mainpagedocfooter' )->inContentLanguage()->text()
1742                         );
1743
1744                         $page->doEditContent( $content,
1745                                 '',
1746                                 EDIT_NEW,
1747                                 false,
1748                                 User::newFromName( 'MediaWiki default' )
1749                         );
1750                 } catch ( Exception $e ) {
1751                         //using raw, because $wgShowExceptionDetails can not be set yet
1752                         $status->fatal( 'config-install-mainpage-failed', $e->getMessage() );
1753                 }
1754
1755                 return $status;
1756         }
1757
1758         /**
1759          * Override the necessary bits of the config to run an installation.
1760          */
1761         public static function overrideConfig() {
1762                 define( 'MW_NO_SESSION', 1 );
1763
1764                 // Don't access the database
1765                 $GLOBALS['wgUseDatabaseMessages'] = false;
1766                 // Don't cache langconv tables
1767                 $GLOBALS['wgLanguageConverterCacheType'] = CACHE_NONE;
1768                 // Debug-friendly
1769                 $GLOBALS['wgShowExceptionDetails'] = true;
1770                 // Don't break forms
1771                 $GLOBALS['wgExternalLinkTarget'] = '_blank';
1772
1773                 // Extended debugging
1774                 $GLOBALS['wgShowSQLErrors'] = true;
1775                 $GLOBALS['wgShowDBErrorBacktrace'] = true;
1776
1777                 // Allow multiple ob_flush() calls
1778                 $GLOBALS['wgDisableOutputCompression'] = true;
1779
1780                 // Use a sensible cookie prefix (not my_wiki)
1781                 $GLOBALS['wgCookiePrefix'] = 'mw_installer';
1782
1783                 // Some of the environment checks make shell requests, remove limits
1784                 $GLOBALS['wgMaxShellMemory'] = 0;
1785         }
1786
1787         /**
1788          * Add an installation step following the given step.
1789          *
1790          * @param callable $callback A valid installation callback array, in this form:
1791          *    array( 'name' => 'some-unique-name', 'callback' => array( $obj, 'function' ) );
1792          * @param string $findStep The step to find. Omit to put the step at the beginning
1793          */
1794         public function addInstallStep( $callback, $findStep = 'BEGINNING' ) {
1795                 $this->extraInstallSteps[$findStep][] = $callback;
1796         }
1797
1798         /**
1799          * Disable the time limit for execution.
1800          * Some long-running pages (Install, Upgrade) will want to do this
1801          */
1802         protected function disableTimeLimit() {
1803                 MediaWiki\suppressWarnings();
1804                 set_time_limit( 0 );
1805                 MediaWiki\restoreWarnings();
1806         }
1807 }