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                 'envPrepExtension',
 150                 'envPrepServer',
 151                 'envPrepPath',
 152         );
 153
 154         /**
 155          * MediaWiki configuration globals that will eventually be passed through
 156          * to LocalSettings.php. The names only are given here, the defaults
 157          * typically come from DefaultSettings.php.
 158          *
 159          * @var array
 160          */
 161         protected $defaultVarNames = array(
 162                 'wgSitename',
 163                 'wgPasswordSender',
 164                 'wgLanguageCode',
 165                 'wgRightsIcon',
 166                 'wgRightsText',
 167                 'wgRightsUrl',
 168                 'wgMainCacheType',
 169                 'wgEnableEmail',
 170                 'wgEnableUserEmail',
 171                 'wgEnotifUserTalk',
 172                 'wgEnotifWatchlist',
 173                 'wgEmailAuthentication',
 174                 'wgDBtype',
 175                 'wgDiff3',
 176                 'wgImageMagickConvertCommand',
 177                 'wgGitBin',
 178                 'IP',
 179                 'wgScriptPath',
 180                 'wgScriptExtension',
 181                 'wgMetaNamespace',
 182                 'wgDeletedDirectory',
 183                 'wgEnableUploads',
 184                 'wgShellLocale',
 185                 'wgSecretKey',
 186                 'wgUseInstantCommons',
 187                 'wgUpgradeKey',
 188                 'wgDefaultSkin',
 189                 'wgResourceLoaderMaxQueryLength',
 190         );
 191
 192         /**
 193          * Variables that are stored alongside globals, and are used for any
 194          * configuration of the installation process aside from the MediaWiki
 195          * configuration. Map of names to defaults.
 196          *
 197          * @var array
 198          */
 199         protected $internalDefaults = array(
 200                 '_UserLang' => 'en',
 201                 '_Environment' => false,
 202                 '_SafeMode' => false,
 203                 '_RaiseMemory' => false,
 204                 '_UpgradeDone' => false,
 205                 '_InstallDone' => false,
 206                 '_Caches' => array(),
 207                 '_InstallPassword' => '',
 208                 '_SameAccount' => true,
 209                 '_CreateDBAccount' => false,
 210                 '_NamespaceType' => 'site-name',
 211                 '_AdminName' => '', // will be set later, when the user selects language
 212                 '_AdminPassword' => '',
 213                 '_AdminPasswordConfirm' => '',
 214                 '_AdminEmail' => '',
 215                 '_Subscribe' => false,
 216                 '_SkipOptional' => 'continue',
 217                 '_RightsProfile' => 'wiki',
 218                 '_LicenseCode' => 'none',
 219                 '_CCDone' => false,
 220                 '_Extensions' => array(),
 221                 '_Skins' => array(),
 222                 '_MemCachedServers' => '',
 223                 '_UpgradeKeySupplied' => false,
 224                 '_ExistingDBSettings' => false,
 225
 226                 // $wgLogo is probably wrong (bug 48084); set something that will work.
 227                 // Single quotes work fine here, as LocalSettingsGenerator outputs this unescaped.
 228                 'wgLogo' => '$wgStylePath/common/images/wiki.png',
 229         );
 230
 231         /**
 232          * The actual list of installation steps. This will be initialized by getInstallSteps()
 233          *
 234          * @var array
 235          */
 236         private $installSteps = array();
 237
 238         /**
 239          * Extra steps for installation, for things like DatabaseInstallers to modify
 240          *
 241          * @var array
 242          */
 243         protected $extraInstallSteps = array();
 244
 245         /**
 246          * Known object cache types and the functions used to test for their existence.
 247          *
 248          * @var array
 249          */
 250         protected $objectCaches = array(
 251                 'xcache' => 'xcache_get',
 252                 'apc' => 'apc_fetch',
 253                 'wincache' => 'wincache_ucache_get'
 254         );
 255
 256         /**
 257          * User rights profiles.
 258          *
 259          * @var array
 260          */
 261         public $rightsProfiles = array(
 262                 'wiki' => array(),
 263                 'no-anon' => array(
 264                         '*' => array( 'edit' => false )
 265                 ),
 266                 'fishbowl' => array(
 267                         '*' => array(
 268                                 'createaccount' => false,
 269                                 'edit' => false,
 270                         ),
 271                 ),
 272                 'private' => array(
 273                         '*' => array(
 274                                 'createaccount' => false,
 275                                 'edit' => false,
 276                                 'read' => false,
 277                         ),
 278                 ),
 279         );
 280
 281         /**
 282          * License types.
 283          *
 284          * @var array
 285          */
 286         public $licenses = array(
 287                 'cc-by' => array(
 288                         'url' => 'http://creativecommons.org/licenses/by/3.0/',
 289                         'icon' => '{$wgStylePath}/common/images/cc-by.png',
 290                 ),
 291                 'cc-by-sa' => array(
 292                         'url' => 'http://creativecommons.org/licenses/by-sa/3.0/',
 293                         'icon' => '{$wgStylePath}/common/images/cc-by-sa.png',
 294                 ),
 295                 'cc-by-nc-sa' => array(
 296                         'url' => 'http://creativecommons.org/licenses/by-nc-sa/3.0/',
 297                         'icon' => '{$wgStylePath}/common/images/cc-by-nc-sa.png',
 298                 ),
 299                 'cc-0' => array(
 300                         'url' => 'https://creativecommons.org/publicdomain/zero/1.0/',
 301                         'icon' => '{$wgStylePath}/common/images/cc-0.png',
 302                 ),
 303                 'pd' => array(
 304                         'url' => '',
 305                         'icon' => '{$wgStylePath}/common/images/public-domain.png',
 306                 ),
 307                 'gfdl' => array(
 308                         'url' => 'http://www.gnu.org/copyleft/fdl.html',
 309                         'icon' => '{$wgStylePath}/common/images/gnu-fdl.png',
 310                 ),
 311                 'none' => array(
 312                         'url' => '',
 313                         'icon' => '',
 314                         'text' => ''
 315                 ),
 316                 'cc-choose' => array(
 317                         // Details will be filled in by the selector.
 318                         'url' => '',
 319                         'icon' => '',
 320                         'text' => '',
 321                 ),
 322         );
 323
 324         /**
 325          * URL to mediawiki-announce subscription
 326          */
 327         protected $mediaWikiAnnounceUrl =
 328                 'https://lists.wikimedia.org/mailman/subscribe/mediawiki-announce';
 329
 330         /**
 331          * Supported language codes for Mailman
 332          */
 333         protected $mediaWikiAnnounceLanguages = array(
 334                 'ca', 'cs', 'da', 'de', 'en', 'es', 'et', 'eu', 'fi', 'fr', 'hr', 'hu',
 335                 'it', 'ja', 'ko', 'lt', 'nl', 'no', 'pl', 'pt', 'pt-br', 'ro', 'ru',
 336                 'sl', 'sr', 'sv', 'tr', 'uk'
 337         );
 338
 339         /**
 340          * UI interface for displaying a short message
 341          * The parameters are like parameters to wfMessage().
 342          * The messages will be in wikitext format, which will be converted to an
 343          * output format such as HTML or text before being sent to the user.
 344          * @param string $msg
 345          */
 346         abstract public function showMessage( $msg /*, ... */ );
 347
 348         /**
 349          * Same as showMessage(), but for displaying errors
 350          * @param string $msg
 351          */
 352         abstract public function showError( $msg /*, ... */ );
 353
 354         /**
 355          * Show a message to the installing user by using a Status object
 356          * @param Status $status
 357          */
 358         abstract public function showStatusMessage( Status $status );
 359
 360         /**
 361          * Constructor, always call this from child classes.
 362          */
 363         public function __construct() {
 364                 global $wgMessagesDirs, $wgUser;
 365
 366                 // Disable the i18n cache
 367                 Language::getLocalisationCache()->disableBackend();
 368                 // Disable LoadBalancer and wfGetDB etc.
 369                 LBFactory::disableBackend();
 370
 371                 // Disable object cache (otherwise CACHE_ANYTHING will try CACHE_DB and
 372                 // SqlBagOStuff will then throw since we just disabled wfGetDB)
 373                 $GLOBALS['wgMemc'] = new EmptyBagOStuff;
 374                 ObjectCache::clear();
 375                 $emptyCache = array( 'class' => 'EmptyBagOStuff' );
 376                 $GLOBALS['wgObjectCaches'] = array(
 377                         CACHE_NONE => $emptyCache,
 378                         CACHE_DB => $emptyCache,
 379                         CACHE_ANYTHING => $emptyCache,
 380                         CACHE_MEMCACHED => $emptyCache,
 381                 );
 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
 389                 $this->settings = $this->internalDefaults;
 390
 391                 foreach ( $this->defaultVarNames as $var ) {
 392                         $this->settings[$var] = $GLOBALS[$var];
 393                 }
 394
 395                 $this->doEnvironmentPreps();
 396
 397                 $this->compiledDBs = array();
 398                 foreach ( self::getDBTypes() as $type ) {
 399                         $installer = $this->getDBInstaller( $type );
 400
 401                         if ( !$installer->isCompiled() ) {
 402                                 continue;
 403                         }
 404                         $this->compiledDBs[] = $type;
 405                 }
 406
 407                 $this->parserTitle = Title::newFromText( 'Installer' );
 408                 $this->parserOptions = new ParserOptions; // language will be wrong :(
 409                 $this->parserOptions->setEditSection( false );
 410         }
 411
 412         /**
 413          * Get a list of known DB types.
 414          *
 415          * @return array
 416          */
 417         public static function getDBTypes() {
 418                 return self::$dbTypes;
 419         }
 420
 421         /**
 422          * Do initial checks of the PHP environment. Set variables according to
 423          * the observed environment.
 424          *
 425          * It's possible that this may be called under the CLI SAPI, not the SAPI
 426          * that the wiki will primarily run under. In that case, the subclass should
 427          * initialise variables such as wgScriptPath, before calling this function.
 428          *
 429          * Under the web subclass, it can already be assumed that PHP 5+ is in use
 430          * and that sessions are working.
 431          *
 432          * @return Status
 433          */
 434         public function doEnvironmentChecks() {
 435                 // Php version has already been checked by entry scripts
 436                 // Show message here for information purposes
 437                 $this->showMessage( 'config-env-php', PHP_VERSION );
 438
 439                 $good = true;
 440                 // Must go here because an old version of PCRE can prevent other checks from completing
 441                 list( $pcreVersion ) = explode( ' ', PCRE_VERSION, 2 );
 442                 if ( version_compare( $pcreVersion, self::MINIMUM_PCRE_VERSION, '<' ) ) {
 443                         $this->showError( 'config-pcre-old', self::MINIMUM_PCRE_VERSION, $pcreVersion );
 444                         $good = false;
 445                 } else {
 446                         foreach ( $this->envChecks as $check ) {
 447                                 $status = $this->$check();
 448                                 if ( $status === false ) {
 449                                         $good = false;
 450                                 }
 451                         }
 452                 }
 453
 454                 $this->setVar( '_Environment', $good );
 455
 456                 return $good ? Status::newGood() : Status::newFatal( 'config-env-bad' );
 457         }
 458
 459         public function doEnvironmentPreps() {
 460                 foreach ( $this->envPreps as $prep ) {
 461                         $this->$prep();
 462                 }
 463         }
 464
 465         /**
 466          * Set a MW configuration variable, or internal installer configuration variable.
 467          *
 468          * @param string $name
 469          * @param mixed $value
 470          */
 471         public function setVar( $name, $value ) {
 472                 $this->settings[$name] = $value;
 473         }
 474
 475         /**
 476          * Get an MW configuration variable, or internal installer configuration variable.
 477          * The defaults come from $GLOBALS (ultimately DefaultSettings.php).
 478          * Installer variables are typically prefixed by an underscore.
 479          *
 480          * @param string $name
 481          * @param mixed $default
 482          *
 483          * @return mixed
 484          */
 485         public function getVar( $name, $default = null ) {
 486                 if ( !isset( $this->settings[$name] ) ) {
 487                         return $default;
 488                 } else {
 489                         return $this->settings[$name];
 490                 }
 491         }
 492
 493         /**
 494          * Get a list of DBs supported by current PHP setup
 495          *
 496          * @return array
 497          */
 498         public function getCompiledDBs() {
 499                 return $this->compiledDBs;
 500         }
 501
 502         /**
 503          * Get an instance of DatabaseInstaller for the specified DB type.
 504          *
 505          * @param mixed $type DB installer for which is needed, false to use default.
 506          *
 507          * @return DatabaseInstaller
 508          */
 509         public function getDBInstaller( $type = false ) {
 510                 if ( !$type ) {
 511                         $type = $this->getVar( 'wgDBtype' );
 512                 }
 513
 514                 $type = strtolower( $type );
 515
 516                 if ( !isset( $this->dbInstallers[$type] ) ) {
 517                         $class = ucfirst( $type ) . 'Installer';
 518                         $this->dbInstallers[$type] = new $class( $this );
 519                 }
 520
 521                 return $this->dbInstallers[$type];
 522         }
 523
 524         /**
 525          * Determine if LocalSettings.php exists. If it does, return its variables.
 526          *
 527          * @return array
 528          */
 529         public static function getExistingLocalSettings() {
 530                 global $IP;
 531
 532                 wfSuppressWarnings();
 533                 $_lsExists = file_exists( "$IP/LocalSettings.php" );
 534                 wfRestoreWarnings();
 535
 536                 if ( !$_lsExists ) {
 537                         return false;
 538                 }
 539                 unset( $_lsExists );
 540
 541                 require "$IP/includes/DefaultSettings.php";
 542                 require "$IP/LocalSettings.php";
 543
 544                 return get_defined_vars();
 545         }
 546
 547         /**
 548          * Get a fake password for sending back to the user in HTML.
 549          * This is a security mechanism to avoid compromise of the password in the
 550          * event of session ID compromise.
 551          *
 552          * @param string $realPassword
 553          *
 554          * @return string
 555          */
 556         public function getFakePassword( $realPassword ) {
 557                 return str_repeat( '*', strlen( $realPassword ) );
 558         }
 559
 560         /**
 561          * Set a variable which stores a password, except if the new value is a
 562          * fake password in which case leave it as it is.
 563          *
 564          * @param string $name
 565          * @param mixed $value
 566          */
 567         public function setPassword( $name, $value ) {
 568                 if ( !preg_match( '/^\*+$/', $value ) ) {
 569                         $this->setVar( $name, $value );
 570                 }
 571         }
 572
 573         /**
 574          * On POSIX systems return the primary group of the webserver we're running under.
 575          * On other systems just returns null.
 576          *
 577          * This is used to advice the user that he should chgrp his mw-config/data/images directory as the
 578          * webserver user before he can install.
 579          *
 580          * Public because SqliteInstaller needs it, and doesn't subclass Installer.
 581          *
 582          * @return mixed
 583          */
 584         public static function maybeGetWebserverPrimaryGroup() {
 585                 if ( !function_exists( 'posix_getegid' ) || !function_exists( 'posix_getpwuid' ) ) {
 586                         # I don't know this, this isn't UNIX.
 587                         return null;
 588                 }
 589
 590                 # posix_getegid() *not* getmygid() because we want the group of the webserver,
 591                 # not whoever owns the current script.
 592                 $gid = posix_getegid();
 593                 $getpwuid = posix_getpwuid( $gid );
 594                 $group = $getpwuid['name'];
 595
 596                 return $group;
 597         }
 598
 599         /**
 600          * Convert wikitext $text to HTML.
 601          *
 602          * This is potentially error prone since many parser features require a complete
 603          * installed MW database. The solution is to just not use those features when you
 604          * write your messages. This appears to work well enough. Basic formatting and
 605          * external links work just fine.
 606          *
 607          * But in case a translator decides to throw in a "#ifexist" or internal link or
 608          * whatever, this function is guarded to catch the attempted DB access and to present
 609          * some fallback text.
 610          *
 611          * @param string $text
 612          * @param bool $lineStart
 613          * @return string
 614          */
 615         public function parse( $text, $lineStart = false ) {
 616                 global $wgParser;
 617
 618                 try {
 619                         $out = $wgParser->parse( $text, $this->parserTitle, $this->parserOptions, $lineStart );
 620                         $html = $out->getText();
 621                 } catch ( DBAccessError $e ) {
 622                         $html = '<!--DB access attempted during parse-->  ' . htmlspecialchars( $text );
 623
 624                         if ( !empty( $this->debug ) ) {
 625                                 $html .= "<!--\n" . $e->getTraceAsString() . "\n-->";
 626                         }
 627                 }
 628
 629                 return $html;
 630         }
 631
 632         /**
 633          * @return ParserOptions
 634          */
 635         public function getParserOptions() {
 636                 return $this->parserOptions;
 637         }
 638
 639         public function disableLinkPopups() {
 640                 $this->parserOptions->setExternalLinkTarget( false );
 641         }
 642
 643         public function restoreLinkPopups() {
 644                 global $wgExternalLinkTarget;
 645                 $this->parserOptions->setExternalLinkTarget( $wgExternalLinkTarget );
 646         }
 647
 648         /**
 649          * Install step which adds a row to the site_stats table with appropriate
 650          * initial values.
 651          *
 652          * @param DatabaseInstaller $installer
 653          *
 654          * @return Status
 655          */
 656         public function populateSiteStats( DatabaseInstaller $installer ) {
 657                 $status = $installer->getConnection();
 658                 if ( !$status->isOK() ) {
 659                         return $status;
 660                 }
 661                 $status->value->insert(
 662                         'site_stats',
 663                         array(
 664                                 'ss_row_id' => 1,
 665                                 'ss_total_views' => 0,
 666                                 'ss_total_edits' => 0,
 667                                 'ss_good_articles' => 0,
 668                                 'ss_total_pages' => 0,
 669                                 'ss_users' => 0,
 670                                 'ss_images' => 0
 671                         ),
 672                         __METHOD__, 'IGNORE'
 673                 );
 674
 675                 return Status::newGood();
 676         }
 677
 678         /**
 679          * Exports all wg* variables stored by the installer into global scope.
 680          */
 681         public function exportVars() {
 682                 foreach ( $this->settings as $name => $value ) {
 683                         if ( substr( $name, 0, 2 ) == 'wg' ) {
 684                                 $GLOBALS[$name] = $value;
 685                         }
 686                 }
 687         }
 688
 689         /**
 690          * Environment check for DB types.
 691          * @return bool
 692          */
 693         protected function envCheckDB() {
 694                 global $wgLang;
 695
 696                 $allNames = array();
 697
 698                 // Messages: config-type-mysql, config-type-postgres, config-type-oracle,
 699                 // config-type-sqlite
 700                 foreach ( self::getDBTypes() as $name ) {
 701                         $allNames[] = wfMessage( "config-type-$name" )->text();
 702                 }
 703
 704                 $databases = $this->getCompiledDBs();
 705
 706                 $databases = array_flip( $databases );
 707                 foreach ( array_keys( $databases ) as $db ) {
 708                         $installer = $this->getDBInstaller( $db );
 709                         $status = $installer->checkPrerequisites();
 710                         if ( !$status->isGood() ) {
 711                                 $this->showStatusMessage( $status );
 712                         }
 713                         if ( !$status->isOK() ) {
 714                                 unset( $databases[$db] );
 715                         }
 716                 }
 717                 $databases = array_flip( $databases );
 718                 if ( !$databases ) {
 719                         $this->showError( 'config-no-db', $wgLang->commaList( $allNames ) );
 720
 721                         // @todo FIXME: This only works for the web installer!
 722                         return false;
 723                 }
 724
 725                 return true;
 726         }
 727
 728         /**
 729          * Environment check for register_globals.
 730          * Prevent installation if enabled
 731          */
 732         protected function envCheckRegisterGlobals() {
 733                 if ( wfIniGetBool( 'register_globals' ) ) {
 734                         $this->showMessage( 'config-register-globals-error' );
 735                         return false;
 736                 }
 737
 738                 return true;
 739         }
 740
 741         /**
 742          * Some versions of libxml+PHP break < and > encoding horribly
 743          * @return bool
 744          */
 745         protected function envCheckBrokenXML() {
 746                 $test = new PhpXmlBugTester();
 747                 if ( !$test->ok ) {
 748                         $this->showError( 'config-brokenlibxml' );
 749
 750                         return false;
 751                 }
 752
 753                 return true;
 754         }
 755
 756         /**
 757          * Environment check for magic_quotes_(gpc|runtime|sybase).
 758          * @return bool
 759          */
 760         protected function envCheckMagicQuotes() {
 761                 $status = true;
 762                 foreach ( array( 'gpc', 'runtime', 'sybase' ) as $magicJunk ) {
 763                         if ( wfIniGetBool( "magic_quotes_$magicJunk" ) ) {
 764                                 $this->showError( "config-magic-quotes-$magicJunk" );
 765                                 $status = false;
 766                         }
 767                 }
 768
 769                 return $status;
 770         }
 771
 772         /**
 773          * Environment check for mbstring.func_overload.
 774          * @return bool
 775          */
 776         protected function envCheckMbstring() {
 777                 if ( wfIniGetBool( 'mbstring.func_overload' ) ) {
 778                         $this->showError( 'config-mbstring' );
 779
 780                         return false;
 781                 }
 782
 783                 return true;
 784         }
 785
 786         /**
 787          * Environment check for safe_mode.
 788          * @return bool
 789          */
 790         protected function envCheckSafeMode() {
 791                 if ( wfIniGetBool( 'safe_mode' ) ) {
 792                         $this->setVar( '_SafeMode', true );
 793                         $this->showMessage( 'config-safe-mode' );
 794                 }
 795
 796                 return true;
 797         }
 798
 799         /**
 800          * Environment check for the XML module.
 801          * @return bool
 802          */
 803         protected function envCheckXML() {
 804                 if ( !function_exists( "utf8_encode" ) ) {
 805                         $this->showError( 'config-xml-bad' );
 806
 807                         return false;
 808                 }
 809
 810                 return true;
 811         }
 812
 813         /**
 814          * Environment check for the PCRE module.
 815          *
 816          * @note If this check were to fail, the parser would
 817          *   probably throw an exception before the result
 818          *   of this check is shown to the user.
 819          * @return bool
 820          */
 821         protected function envCheckPCRE() {
 822                 wfSuppressWarnings();
 823                 $regexd = preg_replace( '/[\x{0430}-\x{04FF}]/iu', '', '-АБВГД-' );
 824                 // Need to check for \p support too, as PCRE can be compiled
 825                 // with utf8 support, but not unicode property support.
 826                 // check that \p{Zs} (space separators) matches
 827                 // U+3000 (Ideographic space)
 828                 $regexprop = preg_replace( '/\p{Zs}/u', '', "-\xE3\x80\x80-" );
 829                 wfRestoreWarnings();
 830                 if ( $regexd != '--' || $regexprop != '--' ) {
 831                         $this->showError( 'config-pcre-no-utf8' );
 832
 833                         return false;
 834                 }
 835
 836                 return true;
 837         }
 838
 839         /**
 840          * Environment check for available memory.
 841          * @return bool
 842          */
 843         protected function envCheckMemory() {
 844                 $limit = ini_get( 'memory_limit' );
 845
 846                 if ( !$limit || $limit == -1 ) {
 847                         return true;
 848                 }
 849
 850                 $n = wfShorthandToInteger( $limit );
 851
 852                 if ( $n < $this->minMemorySize * 1024 * 1024 ) {
 853                         $newLimit = "{$this->minMemorySize}M";
 854
 855                         if ( ini_set( "memory_limit", $newLimit ) === false ) {
 856                                 $this->showMessage( 'config-memory-bad', $limit );
 857                         } else {
 858                                 $this->showMessage( 'config-memory-raised', $limit, $newLimit );
 859                                 $this->setVar( '_RaiseMemory', true );
 860                         }
 861                 }
 862
 863                 return true;
 864         }
 865
 866         /**
 867          * Environment check for compiled object cache types.
 868          */
 869         protected function envCheckCache() {
 870                 $caches = array();
 871                 foreach ( $this->objectCaches as $name => $function ) {
 872                         if ( function_exists( $function ) ) {
 873                                 if ( $name == 'xcache' && !wfIniGetBool( 'xcache.var_size' ) ) {
 874                                         continue;
 875                                 }
 876                                 $caches[$name] = true;
 877                         }
 878                 }
 879
 880                 if ( !$caches ) {
 881                         $this->showMessage( 'config-no-cache' );
 882                 }
 883
 884                 $this->setVar( '_Caches', $caches );
 885         }
 886
 887         /**
 888          * Scare user to death if they have mod_security
 889          * @return bool
 890          */
 891         protected function envCheckModSecurity() {
 892                 if ( self::apacheModulePresent( 'mod_security' ) ) {
 893                         $this->showMessage( 'config-mod-security' );
 894                 }
 895
 896                 return true;
 897         }
 898
 899         /**
 900          * Search for GNU diff3.
 901          * @return bool
 902          */
 903         protected function envCheckDiff3() {
 904                 $names = array( "gdiff3", "diff3", "diff3.exe" );
 905                 $versionInfo = array( '$1 --version 2>&1', 'GNU diffutils' );
 906
 907                 $diff3 = self::locateExecutableInDefaultPaths( $names, $versionInfo );
 908
 909                 if ( $diff3 ) {
 910                         $this->setVar( 'wgDiff3', $diff3 );
 911                 } else {
 912                         $this->setVar( 'wgDiff3', false );
 913                         $this->showMessage( 'config-diff3-bad' );
 914                 }
 915
 916                 return true;
 917         }
 918
 919         /**
 920          * Environment check for ImageMagick and GD.
 921          * @return bool
 922          */
 923         protected function envCheckGraphics() {
 924                 $names = array( wfIsWindows() ? 'convert.exe' : 'convert' );
 925                 $versionInfo = array( '$1 -version', 'ImageMagick' );
 926                 $convert = self::locateExecutableInDefaultPaths( $names, $versionInfo );
 927
 928                 $this->setVar( 'wgImageMagickConvertCommand', '' );
 929                 if ( $convert ) {
 930                         $this->setVar( 'wgImageMagickConvertCommand', $convert );
 931                         $this->showMessage( 'config-imagemagick', $convert );
 932
 933                         return true;
 934                 } elseif ( function_exists( 'imagejpeg' ) ) {
 935                         $this->showMessage( 'config-gd' );
 936                 } else {
 937                         $this->showMessage( 'config-no-scaling' );
 938                 }
 939
 940                 return true;
 941         }
 942
 943         /**
 944          * Search for git.
 945          *
 946          * @since 1.22
 947          * @return bool
 948          */
 949         protected function envCheckGit() {
 950                 $names = array( wfIsWindows() ? 'git.exe' : 'git' );
 951                 $versionInfo = array( '$1 --version', 'git version' );
 952
 953                 $git = self::locateExecutableInDefaultPaths( $names, $versionInfo );
 954
 955                 if ( $git ) {
 956                         $this->setVar( 'wgGitBin', $git );
 957                         $this->showMessage( 'config-git', $git );
 958                 } else {
 959                         $this->setVar( 'wgGitBin', false );
 960                         $this->showMessage( 'config-git-bad' );
 961                 }
 962
 963                 return true;
 964         }
 965
 966         /**
 967          * Environment check to inform user which server we've assumed.
 968          *
 969          * @return bool
 970          */
 971         protected function envCheckServer() {
 972                 $server = $this->envGetDefaultServer();
 973                 if ( $server !== null ) {
 974                         $this->showMessage( 'config-using-server', $server );
 975                 }
 976                 return true;
 977         }
 978
 979         /**
 980          * Environment check to inform user which paths we've assumed.
 981          *
 982          * @return bool
 983          */
 984         protected function envCheckPath() {
 985                 $this->showMessage(
 986                         'config-using-uri',
 987                         $this->getVar( 'wgServer' ),
 988                         $this->getVar( 'wgScriptPath' )
 989                 );
 990                 return true;
 991         }
 992
 993         /**
 994          * Environment check for preferred locale in shell
 995          * @return bool
 996          */
 997         protected function envCheckShellLocale() {
 998                 $os = php_uname( 's' );
 999                 $supported = array( 'Linux', 'SunOS', 'HP-UX', 'Darwin' ); # Tested these
1000
1001                 if ( !in_array( $os, $supported ) ) {
1002                         return true;
1003                 }
1004
1005                 # Get a list of available locales.
1006                 $ret = false;
1007                 $lines = wfShellExec( '/usr/bin/locale -a', $ret );
1008
1009                 if ( $ret ) {
1010                         return true;
1011                 }
1012
1013                 $lines = array_map( 'trim', explode( "\n", $lines ) );
1014                 $candidatesByLocale = array();
1015                 $candidatesByLang = array();
1016
1017                 foreach ( $lines as $line ) {
1018                         if ( $line === '' ) {
1019                                 continue;
1020                         }
1021
1022                         if ( !preg_match( '/^([a-zA-Z]+)(_[a-zA-Z]+|)\.(utf8|UTF-8)(@[a-zA-Z_]*|)$/i', $line, $m ) ) {
1023                                 continue;
1024                         }
1025
1026                         list( , $lang, , , ) = $m;
1027
1028                         $candidatesByLocale[$m[0]] = $m;
1029                         $candidatesByLang[$lang][] = $m;
1030                 }
1031
1032                 # Try the current value of LANG.
1033                 if ( isset( $candidatesByLocale[getenv( 'LANG' )] ) ) {
1034                         $this->setVar( 'wgShellLocale', getenv( 'LANG' ) );
1035
1036                         return true;
1037                 }
1038
1039                 # Try the most common ones.
1040                 $commonLocales = array( 'en_US.UTF-8', 'en_US.utf8', 'de_DE.UTF-8', 'de_DE.utf8' );
1041                 foreach ( $commonLocales as $commonLocale ) {
1042                         if ( isset( $candidatesByLocale[$commonLocale] ) ) {
1043                                 $this->setVar( 'wgShellLocale', $commonLocale );
1044
1045                                 return true;
1046                         }
1047                 }
1048
1049                 # Is there an available locale in the Wiki's language?
1050                 $wikiLang = $this->getVar( 'wgLanguageCode' );
1051
1052                 if ( isset( $candidatesByLang[$wikiLang] ) ) {
1053                         $m = reset( $candidatesByLang[$wikiLang] );
1054                         $this->setVar( 'wgShellLocale', $m[0] );
1055
1056                         return true;
1057                 }
1058
1059                 # Are there any at all?
1060                 if ( count( $candidatesByLocale ) ) {
1061                         $m = reset( $candidatesByLocale );
1062                         $this->setVar( 'wgShellLocale', $m[0] );
1063
1064                         return true;
1065                 }
1066
1067                 # Give up.
1068                 return true;
1069         }
1070
1071         /**
1072          * Environment check for the permissions of the uploads directory
1073          * @return bool
1074          */
1075         protected function envCheckUploadsDirectory() {
1076                 global $IP;
1077
1078                 $dir = $IP . '/images/';
1079                 $url = $this->getVar( 'wgServer' ) . $this->getVar( 'wgScriptPath' ) . '/images/';
1080                 $safe = !$this->dirIsExecutable( $dir, $url );
1081
1082                 if ( !$safe ) {
1083                         $this->showMessage( 'config-uploads-not-safe', $dir );
1084                 }
1085
1086                 return true;
1087         }
1088
1089         /**
1090          * Checks if suhosin.get.max_value_length is set, and if so generate
1091          * a warning because it decreases ResourceLoader performance.
1092          * @return bool
1093          */
1094         protected function envCheckSuhosinMaxValueLength() {
1095                 $maxValueLength = ini_get( 'suhosin.get.max_value_length' );
1096                 if ( $maxValueLength > 0 && $maxValueLength < 1024 ) {
1097                         // Only warn if the value is below the sane 1024
1098                         $this->showMessage( 'config-suhosin-max-value-length', $maxValueLength );
1099                 }
1100
1101                 return true;
1102         }
1103
1104         /**
1105          * Convert a hex string representing a Unicode code point to that code point.
1106          * @param string $c
1107          * @return string
1108          */
1109         protected function unicodeChar( $c ) {
1110                 $c = hexdec( $c );
1111                 if ( $c <= 0x7F ) {
1112                         return chr( $c );
1113                 } elseif ( $c <= 0x7FF ) {
1114                         return chr( 0xC0 | $c >> 6 ) . chr( 0x80 | $c & 0x3F );
1115                 } elseif ( $c <= 0xFFFF ) {
1116                         return chr( 0xE0 | $c >> 12 ) . chr( 0x80 | $c >> 6 & 0x3F )
1117                         . chr( 0x80 | $c & 0x3F );
1118                 } elseif ( $c <= 0x10FFFF ) {
1119                         return chr( 0xF0 | $c >> 18 ) . chr( 0x80 | $c >> 12 & 0x3F )
1120                         . chr( 0x80 | $c >> 6 & 0x3F )
1121                         . chr( 0x80 | $c & 0x3F );
1122                 } else {
1123                         return false;
1124                 }
1125         }
1126
1127         /**
1128          * Check the libicu version
1129          */
1130         protected function envCheckLibicu() {
1131                 $utf8 = function_exists( 'utf8_normalize' );
1132                 $intl = function_exists( 'normalizer_normalize' );
1133
1134                 /**
1135                  * This needs to be updated something that the latest libicu
1136                  * will properly normalize.  This normalization was found at
1137                  * http://www.unicode.org/versions/Unicode5.2.0/#Character_Additions
1138                  * Note that we use the hex representation to create the code
1139                  * points in order to avoid any Unicode-destroying during transit.
1140                  */
1141                 $not_normal_c = $this->unicodeChar( "FA6C" );
1142                 $normal_c = $this->unicodeChar( "242EE" );
1143
1144                 $useNormalizer = 'php';
1145                 $needsUpdate = false;
1146
1147                 /**
1148                  * We're going to prefer the pecl extension here unless
1149                  * utf8_normalize is more up to date.
1150                  */
1151                 if ( $utf8 ) {
1152                         $useNormalizer = 'utf8';
1153                         $utf8 = utf8_normalize( $not_normal_c, UtfNormal::UNORM_NFC );
1154                         if ( $utf8 !== $normal_c ) {
1155                                 $needsUpdate = true;
1156                         }
1157                 }
1158                 if ( $intl ) {
1159                         $useNormalizer = 'intl';
1160                         $intl = normalizer_normalize( $not_normal_c, Normalizer::FORM_C );
1161                         if ( $intl !== $normal_c ) {
1162                                 $needsUpdate = true;
1163                         }
1164                 }
1165
1166                 // Uses messages 'config-unicode-using-php', 'config-unicode-using-utf8',
1167                 // 'config-unicode-using-intl'
1168                 if ( $useNormalizer === 'php' ) {
1169                         $this->showMessage( 'config-unicode-pure-php-warning' );
1170                 } else {
1171                         $this->showMessage( 'config-unicode-using-' . $useNormalizer );
1172                         if ( $needsUpdate ) {
1173                                 $this->showMessage( 'config-unicode-update-warning' );
1174                         }
1175                 }
1176         }
1177
1178         /**
1179          * @return bool
1180          */
1181         protected function envCheckCtype() {
1182                 if ( !function_exists( 'ctype_digit' ) ) {
1183                         $this->showError( 'config-ctype' );
1184
1185                         return false;
1186                 }
1187
1188                 return true;
1189         }
1190
1191         /**
1192          * @return bool
1193          */
1194         protected function envCheckIconv() {
1195                 if ( !function_exists( 'iconv' ) ) {
1196                         $this->showError( 'config-iconv' );
1197
1198                         return false;
1199                 }
1200
1201                 return true;
1202         }
1203
1204         /**
1205          * @return bool
1206          */
1207         protected function envCheckJSON() {
1208                 if ( !function_exists( 'json_decode' ) ) {
1209                         $this->showError( 'config-json' );
1210
1211                         return false;
1212                 }
1213
1214                 return true;
1215         }
1216
1217         /**
1218          * Environment prep for the server hostname.
1219          */
1220         protected function envPrepServer() {
1221                 $server = $this->envGetDefaultServer();
1222                 if ( $server !== null ) {
1223                         $this->setVar( 'wgServer', $server );
1224                 }
1225         }
1226
1227         /**
1228          * Helper function to be called from envPrepServer()
1229          * @return string
1230          */
1231         abstract protected function envGetDefaultServer();
1232
1233         /**
1234          * Environment prep for setting the preferred PHP file extension.
1235          */
1236         protected function envPrepExtension() {
1237                 // @todo FIXME: Detect this properly
1238                 if ( defined( 'MW_INSTALL_PHP5_EXT' ) ) {
1239                         $ext = '.php5';
1240                 } else {
1241                         $ext = '.php';
1242                 }
1243                 $this->setVar( 'wgScriptExtension', $ext );
1244         }
1245
1246         /**
1247          * Environment prep for setting $IP and $wgScriptPath.
1248          */
1249         protected function envPrepPath() {
1250                 global $IP;
1251                 $IP = dirname( dirname( __DIR__ ) );
1252                 $this->setVar( 'IP', $IP );
1253         }
1254
1255         /**
1256          * Get an array of likely places we can find executables. Check a bunch
1257          * of known Unix-like defaults, as well as the PATH environment variable
1258          * (which should maybe make it work for Windows?)
1259          *
1260          * @return array
1261          */
1262         protected static function getPossibleBinPaths() {
1263                 return array_merge(
1264                         array( '/usr/bin', '/usr/local/bin', '/opt/csw/bin',
1265                                 '/usr/gnu/bin', '/usr/sfw/bin', '/sw/bin', '/opt/local/bin' ),
1266                         explode( PATH_SEPARATOR, getenv( 'PATH' ) )
1267                 );
1268         }
1269
1270         /**
1271          * Search a path for any of the given executable names. Returns the
1272          * executable name if found. Also checks the version string returned
1273          * by each executable.
1274          *
1275          * Used only by environment checks.
1276          *
1277          * @param string $path Path to search
1278          * @param array $names Array of executable names
1279          * @param array|bool $versionInfo False or array with two members:
1280          *   0 => Command to run for version check, with $1 for the full executable name
1281          *   1 => String to compare the output with
1282          *
1283          * If $versionInfo is not false, only executables with a version
1284          * matching $versionInfo[1] will be returned.
1285          * @return bool|string
1286          */
1287         public static function locateExecutable( $path, $names, $versionInfo = false ) {
1288                 if ( !is_array( $names ) ) {
1289                         $names = array( $names );
1290                 }
1291
1292                 foreach ( $names as $name ) {
1293                         $command = $path . DIRECTORY_SEPARATOR . $name;
1294
1295                         wfSuppressWarnings();
1296                         $file_exists = file_exists( $command );
1297                         wfRestoreWarnings();
1298
1299                         if ( $file_exists ) {
1300                                 if ( !$versionInfo ) {
1301                                         return $command;
1302                                 }
1303
1304                                 $file = str_replace( '$1', wfEscapeShellArg( $command ), $versionInfo[0] );
1305                                 if ( strstr( wfShellExec( $file ), $versionInfo[1] ) !== false ) {
1306                                         return $command;
1307                                 }
1308                         }
1309                 }
1310
1311                 return false;
1312         }
1313
1314         /**
1315          * Same as locateExecutable(), but checks in getPossibleBinPaths() by default
1316          * @see locateExecutable()
1317          * @param array $names Array of possible names.
1318          * @param array|bool $versionInfo Default: false or array with two members:
1319          *   0 => Command to run for version check, with $1 for the full executable name
1320          *   1 => String to compare the output with
1321          *
1322          * If $versionInfo is not false, only executables with a version
1323          * matching $versionInfo[1] will be returned.
1324          * @return bool|string
1325          */
1326         public static function locateExecutableInDefaultPaths( $names, $versionInfo = false ) {
1327                 foreach ( self::getPossibleBinPaths() as $path ) {
1328                         $exe = self::locateExecutable( $path, $names, $versionInfo );
1329                         if ( $exe !== false ) {
1330                                 return $exe;
1331                         }
1332                 }
1333
1334                 return false;
1335         }
1336
1337         /**
1338          * Checks if scripts located in the given directory can be executed via the given URL.
1339          *
1340          * Used only by environment checks.
1341          * @param string $dir
1342          * @param string $url
1343          * @return bool|int|string
1344          */
1345         public function dirIsExecutable( $dir, $url ) {
1346                 $scriptTypes = array(
1347                         'php' => array(
1348                                 "<?php echo 'ex' . 'ec';",
1349                                 "#!/var/env php5\n<?php echo 'ex' . 'ec';",
1350                         ),
1351                 );
1352
1353                 // it would be good to check other popular languages here, but it'll be slow.
1354
1355                 wfSuppressWarnings();
1356
1357                 foreach ( $scriptTypes as $ext => $contents ) {
1358                         foreach ( $contents as $source ) {
1359                                 $file = 'exectest.' . $ext;
1360
1361                                 if ( !file_put_contents( $dir . $file, $source ) ) {
1362                                         break;
1363                                 }
1364
1365                                 try {
1366                                         $text = Http::get( $url . $file, array( 'timeout' => 3 ) );
1367                                 } catch ( MWException $e ) {
1368                                         // Http::get throws with allow_url_fopen = false and no curl extension.
1369                                         $text = null;
1370                                 }
1371                                 unlink( $dir . $file );
1372
1373                                 if ( $text == 'exec' ) {
1374                                         wfRestoreWarnings();
1375
1376                                         return $ext;
1377                                 }
1378                         }
1379                 }
1380
1381                 wfRestoreWarnings();
1382
1383                 return false;
1384         }
1385
1386         /**
1387          * Checks for presence of an Apache module. Works only if PHP is running as an Apache module, too.
1388          *
1389          * @param string $moduleName Name of module to check.
1390          * @return bool
1391          */
1392         public static function apacheModulePresent( $moduleName ) {
1393                 if ( function_exists( 'apache_get_modules' ) && in_array( $moduleName, apache_get_modules() ) ) {
1394                         return true;
1395                 }
1396                 // try it the hard way
1397                 ob_start();
1398                 phpinfo( INFO_MODULES );
1399                 $info = ob_get_clean();
1400
1401                 return strpos( $info, $moduleName ) !== false;
1402         }
1403
1404         /**
1405          * ParserOptions are constructed before we determined the language, so fix it
1406          *
1407          * @param Language $lang
1408          */
1409         public function setParserLanguage( $lang ) {
1410                 $this->parserOptions->setTargetLanguage( $lang );
1411                 $this->parserOptions->setUserLang( $lang );
1412         }
1413
1414         /**
1415          * Overridden by WebInstaller to provide lastPage parameters.
1416          * @param string $page
1417          * @return string
1418          */
1419         protected function getDocUrl( $page ) {
1420                 return "{$_SERVER['PHP_SELF']}?page=" . urlencode( $page );
1421         }
1422
1423         /**
1424          * Finds extensions that follow the format /$directory/Name/Name.php,
1425          * and returns an array containing the value for 'Name' for each found extension.
1426          *
1427          * Reasonable values for $directory include 'extensions' (the default) and 'skins'.
1428          *
1429          * @param string $directory Directory to search in
1430          * @return array
1431          */
1432         public function findExtensions( $directory = 'extensions' ) {
1433                 if ( $this->getVar( 'IP' ) === null ) {
1434                         return array();
1435                 }
1436
1437                 $extDir = $this->getVar( 'IP' ) . '/' . $directory;
1438                 if ( !is_readable( $extDir ) || !is_dir( $extDir ) ) {
1439                         return array();
1440                 }
1441
1442                 $dh = opendir( $extDir );
1443                 $exts = array();
1444                 while ( ( $file = readdir( $dh ) ) !== false ) {
1445                         if ( !is_dir( "$extDir/$file" ) ) {
1446                                 continue;
1447                         }
1448                         if ( file_exists( "$extDir/$file/$file.php" ) ) {
1449                                 $exts[] = $file;
1450                         }
1451                 }
1452                 closedir( $dh );
1453                 natcasesort( $exts );
1454
1455                 return $exts;
1456         }
1457
1458         /**
1459          * Installs the auto-detected extensions.
1460          *
1461          * @return Status
1462          */
1463         protected function includeExtensions() {
1464                 global $IP;
1465                 $exts = $this->getVar( '_Extensions' );
1466                 $IP = $this->getVar( 'IP' );
1467
1468                 /**
1469                  * We need to include DefaultSettings before including extensions to avoid
1470                  * warnings about unset variables. However, the only thing we really
1471                  * want here is $wgHooks['LoadExtensionSchemaUpdates']. This won't work
1472                  * if the extension has hidden hook registration in $wgExtensionFunctions,
1473                  * but we're not opening that can of worms
1474                  * @see https://bugzilla.wikimedia.org/show_bug.cgi?id=26857
1475                  */
1476                 global $wgAutoloadClasses;
1477                 $wgAutoloadClasses = array();
1478
1479                 require "$IP/includes/DefaultSettings.php";
1480
1481                 foreach ( $exts as $e ) {
1482                         require_once "$IP/extensions/$e/$e.php";
1483                 }
1484
1485                 $hooksWeWant = isset( $wgHooks['LoadExtensionSchemaUpdates'] ) ?
1486                         $wgHooks['LoadExtensionSchemaUpdates'] : array();
1487
1488                 // Unset everyone else's hooks. Lord knows what someone might be doing
1489                 // in ParserFirstCallInit (see bug 27171)
1490                 $GLOBALS['wgHooks'] = array( 'LoadExtensionSchemaUpdates' => $hooksWeWant );
1491
1492                 return Status::newGood();
1493         }
1494
1495         /**
1496          * Get an array of install steps. Should always be in the format of
1497          * array(
1498          *   'name'     => 'someuniquename',
1499          *   'callback' => array( $obj, 'method' ),
1500          * )
1501          * There must be a config-install-$name message defined per step, which will
1502          * be shown on install.
1503          *
1504          * @param DatabaseInstaller $installer DatabaseInstaller so we can make callbacks
1505          * @return array
1506          */
1507         protected function getInstallSteps( DatabaseInstaller $installer ) {
1508                 $coreInstallSteps = array(
1509                         array( 'name' => 'database', 'callback' => array( $installer, 'setupDatabase' ) ),
1510                         array( 'name' => 'tables', 'callback' => array( $installer, 'createTables' ) ),
1511                         array( 'name' => 'interwiki', 'callback' => array( $installer, 'populateInterwikiTable' ) ),
1512                         array( 'name' => 'stats', 'callback' => array( $this, 'populateSiteStats' ) ),
1513                         array( 'name' => 'keys', 'callback' => array( $this, 'generateKeys' ) ),
1514                         array( 'name' => 'sysop', 'callback' => array( $this, 'createSysop' ) ),
1515                         array( 'name' => 'mainpage', 'callback' => array( $this, 'createMainpage' ) ),
1516                 );
1517
1518                 // Build the array of install steps starting from the core install list,
1519                 // then adding any callbacks that wanted to attach after a given step
1520                 foreach ( $coreInstallSteps as $step ) {
1521                         $this->installSteps[] = $step;
1522                         if ( isset( $this->extraInstallSteps[$step['name']] ) ) {
1523                                 $this->installSteps = array_merge(
1524                                         $this->installSteps,
1525                                         $this->extraInstallSteps[$step['name']]
1526                                 );
1527                         }
1528                 }
1529
1530                 // Prepend any steps that want to be at the beginning
1531                 if ( isset( $this->extraInstallSteps['BEGINNING'] ) ) {
1532                         $this->installSteps = array_merge(
1533                                 $this->extraInstallSteps['BEGINNING'],
1534                                 $this->installSteps
1535                         );
1536                 }
1537
1538                 // Extensions should always go first, chance to tie into hooks and such
1539                 if ( count( $this->getVar( '_Extensions' ) ) ) {
1540                         array_unshift( $this->installSteps,
1541                                 array( 'name' => 'extensions', 'callback' => array( $this, 'includeExtensions' ) )
1542                         );
1543                         $this->installSteps[] = array(
1544                                 'name' => 'extension-tables',
1545                                 'callback' => array( $installer, 'createExtensionTables' )
1546                         );
1547                 }
1548
1549                 return $this->installSteps;
1550         }
1551
1552         /**
1553          * Actually perform the installation.
1554          *
1555          * @param callable $startCB A callback array for the beginning of each step
1556          * @param callable $endCB A callback array for the end of each step
1557          *
1558          * @return array Array of Status objects
1559          */
1560         public function performInstallation( $startCB, $endCB ) {
1561                 $installResults = array();
1562                 $installer = $this->getDBInstaller();
1563                 $installer->preInstall();
1564                 $steps = $this->getInstallSteps( $installer );
1565                 foreach ( $steps as $stepObj ) {
1566                         $name = $stepObj['name'];
1567                         call_user_func_array( $startCB, array( $name ) );
1568
1569                         // Perform the callback step
1570                         $status = call_user_func( $stepObj['callback'], $installer );
1571
1572                         // Output and save the results
1573                         call_user_func( $endCB, $name, $status );
1574                         $installResults[$name] = $status;
1575
1576                         // If we've hit some sort of fatal, we need to bail.
1577                         // Callback already had a chance to do output above.
1578                         if ( !$status->isOk() ) {
1579                                 break;
1580                         }
1581                 }
1582                 if ( $status->isOk() ) {
1583                         $this->setVar( '_InstallDone', true );
1584                 }
1585
1586                 return $installResults;
1587         }
1588
1589         /**
1590          * Generate $wgSecretKey. Will warn if we had to use an insecure random source.
1591          *
1592          * @return Status
1593          */
1594         public function generateKeys() {
1595                 $keys = array( 'wgSecretKey' => 64 );
1596                 if ( strval( $this->getVar( 'wgUpgradeKey' ) ) === '' ) {
1597                         $keys['wgUpgradeKey'] = 16;
1598                 }
1599
1600                 return $this->doGenerateKeys( $keys );
1601         }
1602
1603         /**
1604          * Generate a secret value for variables using our CryptRand generator.
1605          * Produce a warning if the random source was insecure.
1606          *
1607          * @param array $keys
1608          * @return Status
1609          */
1610         protected function doGenerateKeys( $keys ) {
1611                 $status = Status::newGood();
1612
1613                 $strong = true;
1614                 foreach ( $keys as $name => $length ) {
1615                         $secretKey = MWCryptRand::generateHex( $length, true );
1616                         if ( !MWCryptRand::wasStrong() ) {
1617                                 $strong = false;
1618                         }
1619
1620                         $this->setVar( $name, $secretKey );
1621                 }
1622
1623                 if ( !$strong ) {
1624                         $names = array_keys( $keys );
1625                         $names = preg_replace( '/^(.*)$/', '\$$1', $names );
1626                         global $wgLang;
1627                         $status->warning( 'config-insecure-keys', $wgLang->listToText( $names ), count( $names ) );
1628                 }
1629
1630                 return $status;
1631         }
1632
1633         /**
1634          * Create the first user account, grant it sysop and bureaucrat rights
1635          *
1636          * @return Status
1637          */
1638         protected function createSysop() {
1639                 $name = $this->getVar( '_AdminName' );
1640                 $user = User::newFromName( $name );
1641
1642                 if ( !$user ) {
1643                         // We should've validated this earlier anyway!
1644                         return Status::newFatal( 'config-admin-error-user', $name );
1645                 }
1646
1647                 if ( $user->idForName() == 0 ) {
1648                         $user->addToDatabase();
1649
1650                         try {
1651                                 $user->setPassword( $this->getVar( '_AdminPassword' ) );
1652                         } catch ( PasswordError $pwe ) {
1653                                 return Status::newFatal( 'config-admin-error-password', $name, $pwe->getMessage() );
1654                         }
1655
1656                         $user->addGroup( 'sysop' );
1657                         $user->addGroup( 'bureaucrat' );
1658                         if ( $this->getVar( '_AdminEmail' ) ) {
1659                                 $user->setEmail( $this->getVar( '_AdminEmail' ) );
1660                         }
1661                         $user->saveSettings();
1662
1663                         // Update user count
1664                         $ssUpdate = new SiteStatsUpdate( 0, 0, 0, 0, 1 );
1665                         $ssUpdate->doUpdate();
1666                 }
1667                 $status = Status::newGood();
1668
1669                 if ( $this->getVar( '_Subscribe' ) && $this->getVar( '_AdminEmail' ) ) {
1670                         $this->subscribeToMediaWikiAnnounce( $status );
1671                 }
1672
1673                 return $status;
1674         }
1675
1676         /**
1677          * @param Status $s
1678          */
1679         private function subscribeToMediaWikiAnnounce( Status $s ) {
1680                 $params = array(
1681                         'email' => $this->getVar( '_AdminEmail' ),
1682                         'language' => 'en',
1683                         'digest' => 0
1684                 );
1685
1686                 // Mailman doesn't support as many languages as we do, so check to make
1687                 // sure their selected language is available
1688                 $myLang = $this->getVar( '_UserLang' );
1689                 if ( in_array( $myLang, $this->mediaWikiAnnounceLanguages ) ) {
1690                         $myLang = $myLang == 'pt-br' ? 'pt_BR' : $myLang; // rewrite to Mailman's pt_BR
1691                         $params['language'] = $myLang;
1692                 }
1693
1694                 if ( MWHttpRequest::canMakeRequests() ) {
1695                         $res = MWHttpRequest::factory( $this->mediaWikiAnnounceUrl,
1696                                 array( 'method' => 'POST', 'postData' => $params ) )->execute();
1697                         if ( !$res->isOK() ) {
1698                                 $s->warning( 'config-install-subscribe-fail', $res->getMessage() );
1699                         }
1700                 } else {
1701                         $s->warning( 'config-install-subscribe-notpossible' );
1702                 }
1703         }
1704
1705         /**
1706          * Insert Main Page with default content.
1707          *
1708          * @param DatabaseInstaller $installer
1709          * @return Status
1710          */
1711         protected function createMainpage( DatabaseInstaller $installer ) {
1712                 $status = Status::newGood();
1713                 try {
1714                         $page = WikiPage::factory( Title::newMainPage() );
1715                         $content = new WikitextContent(
1716                                 wfMessage( 'mainpagetext' )->inContentLanguage()->text() . "\n\n" .
1717                                 wfMessage( 'mainpagedocfooter' )->inContentLanguage()->text()
1718                         );
1719
1720                         $page->doEditContent( $content,
1721                                 '',
1722                                 EDIT_NEW,
1723                                 false,
1724                                 User::newFromName( 'MediaWiki default' )
1725                         );
1726                 } catch ( MWException $e ) {
1727                         //using raw, because $wgShowExceptionDetails can not be set yet
1728                         $status->fatal( 'config-install-mainpage-failed', $e->getMessage() );
1729                 }
1730
1731                 return $status;
1732         }
1733
1734         /**
1735          * Override the necessary bits of the config to run an installation.
1736          */
1737         public static function overrideConfig() {
1738                 define( 'MW_NO_SESSION', 1 );
1739
1740                 // Don't access the database
1741                 $GLOBALS['wgUseDatabaseMessages'] = false;
1742                 // Don't cache langconv tables
1743                 $GLOBALS['wgLanguageConverterCacheType'] = CACHE_NONE;
1744                 // Debug-friendly
1745                 $GLOBALS['wgShowExceptionDetails'] = true;
1746                 // Don't break forms
1747                 $GLOBALS['wgExternalLinkTarget'] = '_blank';
1748
1749                 // Extended debugging
1750                 $GLOBALS['wgShowSQLErrors'] = true;
1751                 $GLOBALS['wgShowDBErrorBacktrace'] = true;
1752
1753                 // Allow multiple ob_flush() calls
1754                 $GLOBALS['wgDisableOutputCompression'] = true;
1755
1756                 // Use a sensible cookie prefix (not my_wiki)
1757                 $GLOBALS['wgCookiePrefix'] = 'mw_installer';
1758
1759                 // Some of the environment checks make shell requests, remove limits
1760                 $GLOBALS['wgMaxShellMemory'] = 0;
1761
1762                 // Don't bother embedding images into generated CSS, which is not cached
1763                 $GLOBALS['wgResourceLoaderLESSFunctions']['embeddable'] = function ( $frame, $less ) {
1764                         return $less->toBool( false );
1765                 };
1766         }
1767
1768         /**
1769          * Add an installation step following the given step.
1770          *
1771          * @param callable $callback A valid installation callback array, in this form:
1772          *    array( 'name' => 'some-unique-name', 'callback' => array( $obj, 'function' ) );
1773          * @param string $findStep The step to find. Omit to put the step at the beginning
1774          */
1775         public function addInstallStep( $callback, $findStep = 'BEGINNING' ) {
1776                 $this->extraInstallSteps[$findStep][] = $callback;
1777         }
1778
1779         /**
1780          * Disable the time limit for execution.
1781          * Some long-running pages (Install, Upgrade) will want to do this
1782          */
1783         protected function disableTimeLimit() {
1784                 wfSuppressWarnings();
1785                 set_time_limit( 0 );
1786                 wfRestoreWarnings();
1787         }
1788 }