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                 // You might be wondering why this is here. Well if you don't do this
 533                 // then some poorly-formed extensions try to call their own classes
 534                 // after immediately registering them. We really need to get extension
 535                 // registration out of the global scope and into a real format.
 536                 // @see https://bugzilla.wikimedia.org/67440
 537                 global $wgAutoloadClasses;
 538                 $wgAutoloadClasses = array();
 539
 540                 wfSuppressWarnings();
 541                 $_lsExists = file_exists( "$IP/LocalSettings.php" );
 542                 wfRestoreWarnings();
 543
 544                 if ( !$_lsExists ) {
 545                         return false;
 546                 }
 547                 unset( $_lsExists );
 548
 549                 require "$IP/includes/DefaultSettings.php";
 550                 require "$IP/LocalSettings.php";
 551
 552                 return get_defined_vars();
 553         }
 554
 555         /**
 556          * Get a fake password for sending back to the user in HTML.
 557          * This is a security mechanism to avoid compromise of the password in the
 558          * event of session ID compromise.
 559          *
 560          * @param string $realPassword
 561          *
 562          * @return string
 563          */
 564         public function getFakePassword( $realPassword ) {
 565                 return str_repeat( '*', strlen( $realPassword ) );
 566         }
 567
 568         /**
 569          * Set a variable which stores a password, except if the new value is a
 570          * fake password in which case leave it as it is.
 571          *
 572          * @param string $name
 573          * @param mixed $value
 574          */
 575         public function setPassword( $name, $value ) {
 576                 if ( !preg_match( '/^\*+$/', $value ) ) {
 577                         $this->setVar( $name, $value );
 578                 }
 579         }
 580
 581         /**
 582          * On POSIX systems return the primary group of the webserver we're running under.
 583          * On other systems just returns null.
 584          *
 585          * This is used to advice the user that he should chgrp his mw-config/data/images directory as the
 586          * webserver user before he can install.
 587          *
 588          * Public because SqliteInstaller needs it, and doesn't subclass Installer.
 589          *
 590          * @return mixed
 591          */
 592         public static function maybeGetWebserverPrimaryGroup() {
 593                 if ( !function_exists( 'posix_getegid' ) || !function_exists( 'posix_getpwuid' ) ) {
 594                         # I don't know this, this isn't UNIX.
 595                         return null;
 596                 }
 597
 598                 # posix_getegid() *not* getmygid() because we want the group of the webserver,
 599                 # not whoever owns the current script.
 600                 $gid = posix_getegid();
 601                 $getpwuid = posix_getpwuid( $gid );
 602                 $group = $getpwuid['name'];
 603
 604                 return $group;
 605         }
 606
 607         /**
 608          * Convert wikitext $text to HTML.
 609          *
 610          * This is potentially error prone since many parser features require a complete
 611          * installed MW database. The solution is to just not use those features when you
 612          * write your messages. This appears to work well enough. Basic formatting and
 613          * external links work just fine.
 614          *
 615          * But in case a translator decides to throw in a "#ifexist" or internal link or
 616          * whatever, this function is guarded to catch the attempted DB access and to present
 617          * some fallback text.
 618          *
 619          * @param string $text
 620          * @param bool $lineStart
 621          * @return string
 622          */
 623         public function parse( $text, $lineStart = false ) {
 624                 global $wgParser;
 625
 626                 try {
 627                         $out = $wgParser->parse( $text, $this->parserTitle, $this->parserOptions, $lineStart );
 628                         $html = $out->getText();
 629                 } catch ( DBAccessError $e ) {
 630                         $html = '<!--DB access attempted during parse-->  ' . htmlspecialchars( $text );
 631
 632                         if ( !empty( $this->debug ) ) {
 633                                 $html .= "<!--\n" . $e->getTraceAsString() . "\n-->";
 634                         }
 635                 }
 636
 637                 return $html;
 638         }
 639
 640         /**
 641          * @return ParserOptions
 642          */
 643         public function getParserOptions() {
 644                 return $this->parserOptions;
 645         }
 646
 647         public function disableLinkPopups() {
 648                 $this->parserOptions->setExternalLinkTarget( false );
 649         }
 650
 651         public function restoreLinkPopups() {
 652                 global $wgExternalLinkTarget;
 653                 $this->parserOptions->setExternalLinkTarget( $wgExternalLinkTarget );
 654         }
 655
 656         /**
 657          * Install step which adds a row to the site_stats table with appropriate
 658          * initial values.
 659          *
 660          * @param DatabaseInstaller $installer
 661          *
 662          * @return Status
 663          */
 664         public function populateSiteStats( DatabaseInstaller $installer ) {
 665                 $status = $installer->getConnection();
 666                 if ( !$status->isOK() ) {
 667                         return $status;
 668                 }
 669                 $status->value->insert(
 670                         'site_stats',
 671                         array(
 672                                 'ss_row_id' => 1,
 673                                 'ss_total_views' => 0,
 674                                 'ss_total_edits' => 0,
 675                                 'ss_good_articles' => 0,
 676                                 'ss_total_pages' => 0,
 677                                 'ss_users' => 0,
 678                                 'ss_images' => 0
 679                         ),
 680                         __METHOD__, 'IGNORE'
 681                 );
 682
 683                 return Status::newGood();
 684         }
 685
 686         /**
 687          * Exports all wg* variables stored by the installer into global scope.
 688          */
 689         public function exportVars() {
 690                 foreach ( $this->settings as $name => $value ) {
 691                         if ( substr( $name, 0, 2 ) == 'wg' ) {
 692                                 $GLOBALS[$name] = $value;
 693                         }
 694                 }
 695         }
 696
 697         /**
 698          * Environment check for DB types.
 699          * @return bool
 700          */
 701         protected function envCheckDB() {
 702                 global $wgLang;
 703
 704                 $allNames = array();
 705
 706                 // Messages: config-type-mysql, config-type-postgres, config-type-oracle,
 707                 // config-type-sqlite
 708                 foreach ( self::getDBTypes() as $name ) {
 709                         $allNames[] = wfMessage( "config-type-$name" )->text();
 710                 }
 711
 712                 $databases = $this->getCompiledDBs();
 713
 714                 $databases = array_flip( $databases );
 715                 foreach ( array_keys( $databases ) as $db ) {
 716                         $installer = $this->getDBInstaller( $db );
 717                         $status = $installer->checkPrerequisites();
 718                         if ( !$status->isGood() ) {
 719                                 $this->showStatusMessage( $status );
 720                         }
 721                         if ( !$status->isOK() ) {
 722                                 unset( $databases[$db] );
 723                         }
 724                 }
 725                 $databases = array_flip( $databases );
 726                 if ( !$databases ) {
 727                         $this->showError( 'config-no-db', $wgLang->commaList( $allNames ) );
 728
 729                         // @todo FIXME: This only works for the web installer!
 730                         return false;
 731                 }
 732
 733                 return true;
 734         }
 735
 736         /**
 737          * Environment check for register_globals.
 738          * Prevent installation if enabled
 739          * @return bool
 740          */
 741         protected function envCheckRegisterGlobals() {
 742                 if ( wfIniGetBool( 'register_globals' ) ) {
 743                         $this->showMessage( 'config-register-globals-error' );
 744                         return false;
 745                 }
 746
 747                 return true;
 748         }
 749
 750         /**
 751          * Some versions of libxml+PHP break < and > encoding horribly
 752          * @return bool
 753          */
 754         protected function envCheckBrokenXML() {
 755                 $test = new PhpXmlBugTester();
 756                 if ( !$test->ok ) {
 757                         $this->showError( 'config-brokenlibxml' );
 758
 759                         return false;
 760                 }
 761
 762                 return true;
 763         }
 764
 765         /**
 766          * Environment check for magic_quotes_(gpc|runtime|sybase).
 767          * @return bool
 768          */
 769         protected function envCheckMagicQuotes() {
 770                 $status = true;
 771                 foreach ( array( 'gpc', 'runtime', 'sybase' ) as $magicJunk ) {
 772                         if ( wfIniGetBool( "magic_quotes_$magicJunk" ) ) {
 773                                 $this->showError( "config-magic-quotes-$magicJunk" );
 774                                 $status = false;
 775                         }
 776                 }
 777
 778                 return $status;
 779         }
 780
 781         /**
 782          * Environment check for mbstring.func_overload.
 783          * @return bool
 784          */
 785         protected function envCheckMbstring() {
 786                 if ( wfIniGetBool( 'mbstring.func_overload' ) ) {
 787                         $this->showError( 'config-mbstring' );
 788
 789                         return false;
 790                 }
 791
 792                 return true;
 793         }
 794
 795         /**
 796          * Environment check for safe_mode.
 797          * @return bool
 798          */
 799         protected function envCheckSafeMode() {
 800                 if ( wfIniGetBool( 'safe_mode' ) ) {
 801                         $this->setVar( '_SafeMode', true );
 802                         $this->showMessage( 'config-safe-mode' );
 803                 }
 804
 805                 return true;
 806         }
 807
 808         /**
 809          * Environment check for the XML module.
 810          * @return bool
 811          */
 812         protected function envCheckXML() {
 813                 if ( !function_exists( "utf8_encode" ) ) {
 814                         $this->showError( 'config-xml-bad' );
 815
 816                         return false;
 817                 }
 818
 819                 return true;
 820         }
 821
 822         /**
 823          * Environment check for the PCRE module.
 824          *
 825          * @note If this check were to fail, the parser would
 826          *   probably throw an exception before the result
 827          *   of this check is shown to the user.
 828          * @return bool
 829          */
 830         protected function envCheckPCRE() {
 831                 wfSuppressWarnings();
 832                 $regexd = preg_replace( '/[\x{0430}-\x{04FF}]/iu', '', '-АБВГД-' );
 833                 // Need to check for \p support too, as PCRE can be compiled
 834                 // with utf8 support, but not unicode property support.
 835                 // check that \p{Zs} (space separators) matches
 836                 // U+3000 (Ideographic space)
 837                 $regexprop = preg_replace( '/\p{Zs}/u', '', "-\xE3\x80\x80-" );
 838                 wfRestoreWarnings();
 839                 if ( $regexd != '--' || $regexprop != '--' ) {
 840                         $this->showError( 'config-pcre-no-utf8' );
 841
 842                         return false;
 843                 }
 844
 845                 return true;
 846         }
 847
 848         /**
 849          * Environment check for available memory.
 850          * @return bool
 851          */
 852         protected function envCheckMemory() {
 853                 $limit = ini_get( 'memory_limit' );
 854
 855                 if ( !$limit || $limit == -1 ) {
 856                         return true;
 857                 }
 858
 859                 $n = wfShorthandToInteger( $limit );
 860
 861                 if ( $n < $this->minMemorySize * 1024 * 1024 ) {
 862                         $newLimit = "{$this->minMemorySize}M";
 863
 864                         if ( ini_set( "memory_limit", $newLimit ) === false ) {
 865                                 $this->showMessage( 'config-memory-bad', $limit );
 866                         } else {
 867                                 $this->showMessage( 'config-memory-raised', $limit, $newLimit );
 868                                 $this->setVar( '_RaiseMemory', true );
 869                         }
 870                 }
 871
 872                 return true;
 873         }
 874
 875         /**
 876          * Environment check for compiled object cache types.
 877          */
 878         protected function envCheckCache() {
 879                 $caches = array();
 880                 foreach ( $this->objectCaches as $name => $function ) {
 881                         if ( function_exists( $function ) ) {
 882                                 if ( $name == 'xcache' && !wfIniGetBool( 'xcache.var_size' ) ) {
 883                                         continue;
 884                                 }
 885                                 $caches[$name] = true;
 886                         }
 887                 }
 888
 889                 if ( !$caches ) {
 890                         $this->showMessage( 'config-no-cache' );
 891                 }
 892
 893                 $this->setVar( '_Caches', $caches );
 894         }
 895
 896         /**
 897          * Scare user to death if they have mod_security
 898          * @return bool
 899          */
 900         protected function envCheckModSecurity() {
 901                 if ( self::apacheModulePresent( 'mod_security' ) ) {
 902                         $this->showMessage( 'config-mod-security' );
 903                 }
 904
 905                 return true;
 906         }
 907
 908         /**
 909          * Search for GNU diff3.
 910          * @return bool
 911          */
 912         protected function envCheckDiff3() {
 913                 $names = array( "gdiff3", "diff3", "diff3.exe" );
 914                 $versionInfo = array( '$1 --version 2>&1', 'GNU diffutils' );
 915
 916                 $diff3 = self::locateExecutableInDefaultPaths( $names, $versionInfo );
 917
 918                 if ( $diff3 ) {
 919                         $this->setVar( 'wgDiff3', $diff3 );
 920                 } else {
 921                         $this->setVar( 'wgDiff3', false );
 922                         $this->showMessage( 'config-diff3-bad' );
 923                 }
 924
 925                 return true;
 926         }
 927
 928         /**
 929          * Environment check for ImageMagick and GD.
 930          * @return bool
 931          */
 932         protected function envCheckGraphics() {
 933                 $names = array( wfIsWindows() ? 'convert.exe' : 'convert' );
 934                 $versionInfo = array( '$1 -version', 'ImageMagick' );
 935                 $convert = self::locateExecutableInDefaultPaths( $names, $versionInfo );
 936
 937                 $this->setVar( 'wgImageMagickConvertCommand', '' );
 938                 if ( $convert ) {
 939                         $this->setVar( 'wgImageMagickConvertCommand', $convert );
 940                         $this->showMessage( 'config-imagemagick', $convert );
 941
 942                         return true;
 943                 } elseif ( function_exists( 'imagejpeg' ) ) {
 944                         $this->showMessage( 'config-gd' );
 945                 } else {
 946                         $this->showMessage( 'config-no-scaling' );
 947                 }
 948
 949                 return true;
 950         }
 951
 952         /**
 953          * Search for git.
 954          *
 955          * @since 1.22
 956          * @return bool
 957          */
 958         protected function envCheckGit() {
 959                 $names = array( wfIsWindows() ? 'git.exe' : 'git' );
 960                 $versionInfo = array( '$1 --version', 'git version' );
 961
 962                 $git = self::locateExecutableInDefaultPaths( $names, $versionInfo );
 963
 964                 if ( $git ) {
 965                         $this->setVar( 'wgGitBin', $git );
 966                         $this->showMessage( 'config-git', $git );
 967                 } else {
 968                         $this->setVar( 'wgGitBin', false );
 969                         $this->showMessage( 'config-git-bad' );
 970                 }
 971
 972                 return true;
 973         }
 974
 975         /**
 976          * Environment check to inform user which server we've assumed.
 977          *
 978          * @return bool
 979          */
 980         protected function envCheckServer() {
 981                 $server = $this->envGetDefaultServer();
 982                 if ( $server !== null ) {
 983                         $this->showMessage( 'config-using-server', $server );
 984                 }
 985                 return true;
 986         }
 987
 988         /**
 989          * Environment check to inform user which paths we've assumed.
 990          *
 991          * @return bool
 992          */
 993         protected function envCheckPath() {
 994                 $this->showMessage(
 995                         'config-using-uri',
 996                         $this->getVar( 'wgServer' ),
 997                         $this->getVar( 'wgScriptPath' )
 998                 );
 999                 return true;
1000         }
1001
1002         /**
1003          * Environment check for preferred locale in shell
1004          * @return bool
1005          */
1006         protected function envCheckShellLocale() {
1007                 $os = php_uname( 's' );
1008                 $supported = array( 'Linux', 'SunOS', 'HP-UX', 'Darwin' ); # Tested these
1009
1010                 if ( !in_array( $os, $supported ) ) {
1011                         return true;
1012                 }
1013
1014                 # Get a list of available locales.
1015                 $ret = false;
1016                 $lines = wfShellExec( '/usr/bin/locale -a', $ret );
1017
1018                 if ( $ret ) {
1019                         return true;
1020                 }
1021
1022                 $lines = array_map( 'trim', explode( "\n", $lines ) );
1023                 $candidatesByLocale = array();
1024                 $candidatesByLang = array();
1025
1026                 foreach ( $lines as $line ) {
1027                         if ( $line === '' ) {
1028                                 continue;
1029                         }
1030
1031                         if ( !preg_match( '/^([a-zA-Z]+)(_[a-zA-Z]+|)\.(utf8|UTF-8)(@[a-zA-Z_]*|)$/i', $line, $m ) ) {
1032                                 continue;
1033                         }
1034
1035                         list( , $lang, , , ) = $m;
1036
1037                         $candidatesByLocale[$m[0]] = $m;
1038                         $candidatesByLang[$lang][] = $m;
1039                 }
1040
1041                 # Try the current value of LANG.
1042                 if ( isset( $candidatesByLocale[getenv( 'LANG' )] ) ) {
1043                         $this->setVar( 'wgShellLocale', getenv( 'LANG' ) );
1044
1045                         return true;
1046                 }
1047
1048                 # Try the most common ones.
1049                 $commonLocales = array( 'en_US.UTF-8', 'en_US.utf8', 'de_DE.UTF-8', 'de_DE.utf8' );
1050                 foreach ( $commonLocales as $commonLocale ) {
1051                         if ( isset( $candidatesByLocale[$commonLocale] ) ) {
1052                                 $this->setVar( 'wgShellLocale', $commonLocale );
1053
1054                                 return true;
1055                         }
1056                 }
1057
1058                 # Is there an available locale in the Wiki's language?
1059                 $wikiLang = $this->getVar( 'wgLanguageCode' );
1060
1061                 if ( isset( $candidatesByLang[$wikiLang] ) ) {
1062                         $m = reset( $candidatesByLang[$wikiLang] );
1063                         $this->setVar( 'wgShellLocale', $m[0] );
1064
1065                         return true;
1066                 }
1067
1068                 # Are there any at all?
1069                 if ( count( $candidatesByLocale ) ) {
1070                         $m = reset( $candidatesByLocale );
1071                         $this->setVar( 'wgShellLocale', $m[0] );
1072
1073                         return true;
1074                 }
1075
1076                 # Give up.
1077                 return true;
1078         }
1079
1080         /**
1081          * Environment check for the permissions of the uploads directory
1082          * @return bool
1083          */
1084         protected function envCheckUploadsDirectory() {
1085                 global $IP;
1086
1087                 $dir = $IP . '/images/';
1088                 $url = $this->getVar( 'wgServer' ) . $this->getVar( 'wgScriptPath' ) . '/images/';
1089                 $safe = !$this->dirIsExecutable( $dir, $url );
1090
1091                 if ( !$safe ) {
1092                         $this->showMessage( 'config-uploads-not-safe', $dir );
1093                 }
1094
1095                 return true;
1096         }
1097
1098         /**
1099          * Checks if suhosin.get.max_value_length is set, and if so generate
1100          * a warning because it decreases ResourceLoader performance.
1101          * @return bool
1102          */
1103         protected function envCheckSuhosinMaxValueLength() {
1104                 $maxValueLength = ini_get( 'suhosin.get.max_value_length' );
1105                 if ( $maxValueLength > 0 && $maxValueLength < 1024 ) {
1106                         // Only warn if the value is below the sane 1024
1107                         $this->showMessage( 'config-suhosin-max-value-length', $maxValueLength );
1108                 }
1109
1110                 return true;
1111         }
1112
1113         /**
1114          * Convert a hex string representing a Unicode code point to that code point.
1115          * @param string $c
1116          * @return string
1117          */
1118         protected function unicodeChar( $c ) {
1119                 $c = hexdec( $c );
1120                 if ( $c <= 0x7F ) {
1121                         return chr( $c );
1122                 } elseif ( $c <= 0x7FF ) {
1123                         return chr( 0xC0 | $c >> 6 ) . chr( 0x80 | $c & 0x3F );
1124                 } elseif ( $c <= 0xFFFF ) {
1125                         return chr( 0xE0 | $c >> 12 ) . chr( 0x80 | $c >> 6 & 0x3F )
1126                         . chr( 0x80 | $c & 0x3F );
1127                 } elseif ( $c <= 0x10FFFF ) {
1128                         return chr( 0xF0 | $c >> 18 ) . chr( 0x80 | $c >> 12 & 0x3F )
1129                         . chr( 0x80 | $c >> 6 & 0x3F )
1130                         . chr( 0x80 | $c & 0x3F );
1131                 } else {
1132                         return false;
1133                 }
1134         }
1135
1136         /**
1137          * Check the libicu version
1138          */
1139         protected function envCheckLibicu() {
1140                 $utf8 = function_exists( 'utf8_normalize' );
1141                 $intl = function_exists( 'normalizer_normalize' );
1142
1143                 /**
1144                  * This needs to be updated something that the latest libicu
1145                  * will properly normalize.  This normalization was found at
1146                  * http://www.unicode.org/versions/Unicode5.2.0/#Character_Additions
1147                  * Note that we use the hex representation to create the code
1148                  * points in order to avoid any Unicode-destroying during transit.
1149                  */
1150                 $not_normal_c = $this->unicodeChar( "FA6C" );
1151                 $normal_c = $this->unicodeChar( "242EE" );
1152
1153                 $useNormalizer = 'php';
1154                 $needsUpdate = false;
1155
1156                 /**
1157                  * We're going to prefer the pecl extension here unless
1158                  * utf8_normalize is more up to date.
1159                  */
1160                 if ( $utf8 ) {
1161                         $useNormalizer = 'utf8';
1162                         $utf8 = utf8_normalize( $not_normal_c, UtfNormal::UNORM_NFC );
1163                         if ( $utf8 !== $normal_c ) {
1164                                 $needsUpdate = true;
1165                         }
1166                 }
1167                 if ( $intl ) {
1168                         $useNormalizer = 'intl';
1169                         $intl = normalizer_normalize( $not_normal_c, Normalizer::FORM_C );
1170                         if ( $intl !== $normal_c ) {
1171                                 $needsUpdate = true;
1172                         }
1173                 }
1174
1175                 // Uses messages 'config-unicode-using-php', 'config-unicode-using-utf8',
1176                 // 'config-unicode-using-intl'
1177                 if ( $useNormalizer === 'php' ) {
1178                         $this->showMessage( 'config-unicode-pure-php-warning' );
1179                 } else {
1180                         $this->showMessage( 'config-unicode-using-' . $useNormalizer );
1181                         if ( $needsUpdate ) {
1182                                 $this->showMessage( 'config-unicode-update-warning' );
1183                         }
1184                 }
1185         }
1186
1187         /**
1188          * @return bool
1189          */
1190         protected function envCheckCtype() {
1191                 if ( !function_exists( 'ctype_digit' ) ) {
1192                         $this->showError( 'config-ctype' );
1193
1194                         return false;
1195                 }
1196
1197                 return true;
1198         }
1199
1200         /**
1201          * @return bool
1202          */
1203         protected function envCheckIconv() {
1204                 if ( !function_exists( 'iconv' ) ) {
1205                         $this->showError( 'config-iconv' );
1206
1207                         return false;
1208                 }
1209
1210                 return true;
1211         }
1212
1213         /**
1214          * @return bool
1215          */
1216         protected function envCheckJSON() {
1217                 if ( !function_exists( 'json_decode' ) ) {
1218                         $this->showError( 'config-json' );
1219
1220                         return false;
1221                 }
1222
1223                 return true;
1224         }
1225
1226         /**
1227          * Environment prep for the server hostname.
1228          */
1229         protected function envPrepServer() {
1230                 $server = $this->envGetDefaultServer();
1231                 if ( $server !== null ) {
1232                         $this->setVar( 'wgServer', $server );
1233                 }
1234         }
1235
1236         /**
1237          * Helper function to be called from envPrepServer()
1238          * @return string
1239          */
1240         abstract protected function envGetDefaultServer();
1241
1242         /**
1243          * Environment prep for setting the preferred PHP file extension.
1244          */
1245         protected function envPrepExtension() {
1246                 // @todo FIXME: Detect this properly
1247                 if ( defined( 'MW_INSTALL_PHP5_EXT' ) ) {
1248                         $ext = '.php5';
1249                 } else {
1250                         $ext = '.php';
1251                 }
1252                 $this->setVar( 'wgScriptExtension', $ext );
1253         }
1254
1255         /**
1256          * Environment prep for setting $IP and $wgScriptPath.
1257          */
1258         protected function envPrepPath() {
1259                 global $IP;
1260                 $IP = dirname( dirname( __DIR__ ) );
1261                 $this->setVar( 'IP', $IP );
1262         }
1263
1264         /**
1265          * Get an array of likely places we can find executables. Check a bunch
1266          * of known Unix-like defaults, as well as the PATH environment variable
1267          * (which should maybe make it work for Windows?)
1268          *
1269          * @return array
1270          */
1271         protected static function getPossibleBinPaths() {
1272                 return array_merge(
1273                         array( '/usr/bin', '/usr/local/bin', '/opt/csw/bin',
1274                                 '/usr/gnu/bin', '/usr/sfw/bin', '/sw/bin', '/opt/local/bin' ),
1275                         explode( PATH_SEPARATOR, getenv( 'PATH' ) )
1276                 );
1277         }
1278
1279         /**
1280          * Search a path for any of the given executable names. Returns the
1281          * executable name if found. Also checks the version string returned
1282          * by each executable.
1283          *
1284          * Used only by environment checks.
1285          *
1286          * @param string $path Path to search
1287          * @param array $names Array of executable names
1288          * @param array|bool $versionInfo False or array with two members:
1289          *   0 => Command to run for version check, with $1 for the full executable name
1290          *   1 => String to compare the output with
1291          *
1292          * If $versionInfo is not false, only executables with a version
1293          * matching $versionInfo[1] will be returned.
1294          * @return bool|string
1295          */
1296         public static function locateExecutable( $path, $names, $versionInfo = false ) {
1297                 if ( !is_array( $names ) ) {
1298                         $names = array( $names );
1299                 }
1300
1301                 foreach ( $names as $name ) {
1302                         $command = $path . DIRECTORY_SEPARATOR . $name;
1303
1304                         wfSuppressWarnings();
1305                         $file_exists = file_exists( $command );
1306                         wfRestoreWarnings();
1307
1308                         if ( $file_exists ) {
1309                                 if ( !$versionInfo ) {
1310                                         return $command;
1311                                 }
1312
1313                                 $file = str_replace( '$1', wfEscapeShellArg( $command ), $versionInfo[0] );
1314                                 if ( strstr( wfShellExec( $file ), $versionInfo[1] ) !== false ) {
1315                                         return $command;
1316                                 }
1317                         }
1318                 }
1319
1320                 return false;
1321         }
1322
1323         /**
1324          * Same as locateExecutable(), but checks in getPossibleBinPaths() by default
1325          * @see locateExecutable()
1326          * @param array $names Array of possible names.
1327          * @param array|bool $versionInfo Default: false or array with two members:
1328          *   0 => Command to run for version check, with $1 for the full executable name
1329          *   1 => String to compare the output with
1330          *
1331          * If $versionInfo is not false, only executables with a version
1332          * matching $versionInfo[1] will be returned.
1333          * @return bool|string
1334          */
1335         public static function locateExecutableInDefaultPaths( $names, $versionInfo = false ) {
1336                 foreach ( self::getPossibleBinPaths() as $path ) {
1337                         $exe = self::locateExecutable( $path, $names, $versionInfo );
1338                         if ( $exe !== false ) {
1339                                 return $exe;
1340                         }
1341                 }
1342
1343                 return false;
1344         }
1345
1346         /**
1347          * Checks if scripts located in the given directory can be executed via the given URL.
1348          *
1349          * Used only by environment checks.
1350          * @param string $dir
1351          * @param string $url
1352          * @return bool|int|string
1353          */
1354         public function dirIsExecutable( $dir, $url ) {
1355                 $scriptTypes = array(
1356                         'php' => array(
1357                                 "<?php echo 'ex' . 'ec';",
1358                                 "#!/var/env php5\n<?php echo 'ex' . 'ec';",
1359                         ),
1360                 );
1361
1362                 // it would be good to check other popular languages here, but it'll be slow.
1363
1364                 wfSuppressWarnings();
1365
1366                 foreach ( $scriptTypes as $ext => $contents ) {
1367                         foreach ( $contents as $source ) {
1368                                 $file = 'exectest.' . $ext;
1369
1370                                 if ( !file_put_contents( $dir . $file, $source ) ) {
1371                                         break;
1372                                 }
1373
1374                                 try {
1375                                         $text = Http::get( $url . $file, array( 'timeout' => 3 ) );
1376                                 } catch ( MWException $e ) {
1377                                         // Http::get throws with allow_url_fopen = false and no curl extension.
1378                                         $text = null;
1379                                 }
1380                                 unlink( $dir . $file );
1381
1382                                 if ( $text == 'exec' ) {
1383                                         wfRestoreWarnings();
1384
1385                                         return $ext;
1386                                 }
1387                         }
1388                 }
1389
1390                 wfRestoreWarnings();
1391
1392                 return false;
1393         }
1394
1395         /**
1396          * Checks for presence of an Apache module. Works only if PHP is running as an Apache module, too.
1397          *
1398          * @param string $moduleName Name of module to check.
1399          * @return bool
1400          */
1401         public static function apacheModulePresent( $moduleName ) {
1402                 if ( function_exists( 'apache_get_modules' ) && in_array( $moduleName, apache_get_modules() ) ) {
1403                         return true;
1404                 }
1405                 // try it the hard way
1406                 ob_start();
1407                 phpinfo( INFO_MODULES );
1408                 $info = ob_get_clean();
1409
1410                 return strpos( $info, $moduleName ) !== false;
1411         }
1412
1413         /**
1414          * ParserOptions are constructed before we determined the language, so fix it
1415          *
1416          * @param Language $lang
1417          */
1418         public function setParserLanguage( $lang ) {
1419                 $this->parserOptions->setTargetLanguage( $lang );
1420                 $this->parserOptions->setUserLang( $lang );
1421         }
1422
1423         /**
1424          * Overridden by WebInstaller to provide lastPage parameters.
1425          * @param string $page
1426          * @return string
1427          */
1428         protected function getDocUrl( $page ) {
1429                 return "{$_SERVER['PHP_SELF']}?page=" . urlencode( $page );
1430         }
1431
1432         /**
1433          * Finds extensions that follow the format /$directory/Name/Name.php,
1434          * and returns an array containing the value for 'Name' for each found extension.
1435          *
1436          * Reasonable values for $directory include 'extensions' (the default) and 'skins'.
1437          *
1438          * @param string $directory Directory to search in
1439          * @return array
1440          */
1441         public function findExtensions( $directory = 'extensions' ) {
1442                 if ( $this->getVar( 'IP' ) === null ) {
1443                         return array();
1444                 }
1445
1446                 $extDir = $this->getVar( 'IP' ) . '/' . $directory;
1447                 if ( !is_readable( $extDir ) || !is_dir( $extDir ) ) {
1448                         return array();
1449                 }
1450
1451                 $dh = opendir( $extDir );
1452                 $exts = array();
1453                 while ( ( $file = readdir( $dh ) ) !== false ) {
1454                         if ( !is_dir( "$extDir/$file" ) ) {
1455                                 continue;
1456                         }
1457                         if ( file_exists( "$extDir/$file/$file.php" ) ) {
1458                                 $exts[] = $file;
1459                         }
1460                 }
1461                 closedir( $dh );
1462                 natcasesort( $exts );
1463
1464                 return $exts;
1465         }
1466
1467         /**
1468          * Installs the auto-detected extensions.
1469          *
1470          * @return Status
1471          */
1472         protected function includeExtensions() {
1473                 global $IP;
1474                 $exts = $this->getVar( '_Extensions' );
1475                 $IP = $this->getVar( 'IP' );
1476
1477                 /**
1478                  * We need to include DefaultSettings before including extensions to avoid
1479                  * warnings about unset variables. However, the only thing we really
1480                  * want here is $wgHooks['LoadExtensionSchemaUpdates']. This won't work
1481                  * if the extension has hidden hook registration in $wgExtensionFunctions,
1482                  * but we're not opening that can of worms
1483                  * @see https://bugzilla.wikimedia.org/show_bug.cgi?id=26857
1484                  */
1485                 global $wgAutoloadClasses;
1486                 $wgAutoloadClasses = array();
1487
1488                 require "$IP/includes/DefaultSettings.php";
1489
1490                 foreach ( $exts as $e ) {
1491                         require_once "$IP/extensions/$e/$e.php";
1492                 }
1493
1494                 $hooksWeWant = isset( $wgHooks['LoadExtensionSchemaUpdates'] ) ?
1495                         $wgHooks['LoadExtensionSchemaUpdates'] : array();
1496
1497                 // Unset everyone else's hooks. Lord knows what someone might be doing
1498                 // in ParserFirstCallInit (see bug 27171)
1499                 $GLOBALS['wgHooks'] = array( 'LoadExtensionSchemaUpdates' => $hooksWeWant );
1500
1501                 return Status::newGood();
1502         }
1503
1504         /**
1505          * Get an array of install steps. Should always be in the format of
1506          * array(
1507          *   'name'     => 'someuniquename',
1508          *   'callback' => array( $obj, 'method' ),
1509          * )
1510          * There must be a config-install-$name message defined per step, which will
1511          * be shown on install.
1512          *
1513          * @param DatabaseInstaller $installer DatabaseInstaller so we can make callbacks
1514          * @return array
1515          */
1516         protected function getInstallSteps( DatabaseInstaller $installer ) {
1517                 $coreInstallSteps = array(
1518                         array( 'name' => 'database', 'callback' => array( $installer, 'setupDatabase' ) ),
1519                         array( 'name' => 'tables', 'callback' => array( $installer, 'createTables' ) ),
1520                         array( 'name' => 'interwiki', 'callback' => array( $installer, 'populateInterwikiTable' ) ),
1521                         array( 'name' => 'stats', 'callback' => array( $this, 'populateSiteStats' ) ),
1522                         array( 'name' => 'keys', 'callback' => array( $this, 'generateKeys' ) ),
1523                         array( 'name' => 'updates', 'callback' => array( $installer, 'insertUpdateKeys' ) ),
1524                         array( 'name' => 'sysop', 'callback' => array( $this, 'createSysop' ) ),
1525                         array( 'name' => 'mainpage', 'callback' => array( $this, 'createMainpage' ) ),
1526                 );
1527
1528                 // Build the array of install steps starting from the core install list,
1529                 // then adding any callbacks that wanted to attach after a given step
1530                 foreach ( $coreInstallSteps as $step ) {
1531                         $this->installSteps[] = $step;
1532                         if ( isset( $this->extraInstallSteps[$step['name']] ) ) {
1533                                 $this->installSteps = array_merge(
1534                                         $this->installSteps,
1535                                         $this->extraInstallSteps[$step['name']]
1536                                 );
1537                         }
1538                 }
1539
1540                 // Prepend any steps that want to be at the beginning
1541                 if ( isset( $this->extraInstallSteps['BEGINNING'] ) ) {
1542                         $this->installSteps = array_merge(
1543                                 $this->extraInstallSteps['BEGINNING'],
1544                                 $this->installSteps
1545                         );
1546                 }
1547
1548                 // Extensions should always go first, chance to tie into hooks and such
1549                 if ( count( $this->getVar( '_Extensions' ) ) ) {
1550                         array_unshift( $this->installSteps,
1551                                 array( 'name' => 'extensions', 'callback' => array( $this, 'includeExtensions' ) )
1552                         );
1553                         $this->installSteps[] = array(
1554                                 'name' => 'extension-tables',
1555                                 'callback' => array( $installer, 'createExtensionTables' )
1556                         );
1557                 }
1558
1559                 return $this->installSteps;
1560         }
1561
1562         /**
1563          * Actually perform the installation.
1564          *
1565          * @param callable $startCB A callback array for the beginning of each step
1566          * @param callable $endCB A callback array for the end of each step
1567          *
1568          * @return array Array of Status objects
1569          */
1570         public function performInstallation( $startCB, $endCB ) {
1571                 $installResults = array();
1572                 $installer = $this->getDBInstaller();
1573                 $installer->preInstall();
1574                 $steps = $this->getInstallSteps( $installer );
1575                 foreach ( $steps as $stepObj ) {
1576                         $name = $stepObj['name'];
1577                         call_user_func_array( $startCB, array( $name ) );
1578
1579                         // Perform the callback step
1580                         $status = call_user_func( $stepObj['callback'], $installer );
1581
1582                         // Output and save the results
1583                         call_user_func( $endCB, $name, $status );
1584                         $installResults[$name] = $status;
1585
1586                         // If we've hit some sort of fatal, we need to bail.
1587                         // Callback already had a chance to do output above.
1588                         if ( !$status->isOk() ) {
1589                                 break;
1590                         }
1591                 }
1592                 if ( $status->isOk() ) {
1593                         $this->setVar( '_InstallDone', true );
1594                 }
1595
1596                 return $installResults;
1597         }
1598
1599         /**
1600          * Generate $wgSecretKey. Will warn if we had to use an insecure random source.
1601          *
1602          * @return Status
1603          */
1604         public function generateKeys() {
1605                 $keys = array( 'wgSecretKey' => 64 );
1606                 if ( strval( $this->getVar( 'wgUpgradeKey' ) ) === '' ) {
1607                         $keys['wgUpgradeKey'] = 16;
1608                 }
1609
1610                 return $this->doGenerateKeys( $keys );
1611         }
1612
1613         /**
1614          * Generate a secret value for variables using our CryptRand generator.
1615          * Produce a warning if the random source was insecure.
1616          *
1617          * @param array $keys
1618          * @return Status
1619          */
1620         protected function doGenerateKeys( $keys ) {
1621                 $status = Status::newGood();
1622
1623                 $strong = true;
1624                 foreach ( $keys as $name => $length ) {
1625                         $secretKey = MWCryptRand::generateHex( $length, true );
1626                         if ( !MWCryptRand::wasStrong() ) {
1627                                 $strong = false;
1628                         }
1629
1630                         $this->setVar( $name, $secretKey );
1631                 }
1632
1633                 if ( !$strong ) {
1634                         $names = array_keys( $keys );
1635                         $names = preg_replace( '/^(.*)$/', '\$$1', $names );
1636                         global $wgLang;
1637                         $status->warning( 'config-insecure-keys', $wgLang->listToText( $names ), count( $names ) );
1638                 }
1639
1640                 return $status;
1641         }
1642
1643         /**
1644          * Create the first user account, grant it sysop and bureaucrat rights
1645          *
1646          * @return Status
1647          */
1648         protected function createSysop() {
1649                 $name = $this->getVar( '_AdminName' );
1650                 $user = User::newFromName( $name );
1651
1652                 if ( !$user ) {
1653                         // We should've validated this earlier anyway!
1654                         return Status::newFatal( 'config-admin-error-user', $name );
1655                 }
1656
1657                 if ( $user->idForName() == 0 ) {
1658                         $user->addToDatabase();
1659
1660                         try {
1661                                 $user->setPassword( $this->getVar( '_AdminPassword' ) );
1662                         } catch ( PasswordError $pwe ) {
1663                                 return Status::newFatal( 'config-admin-error-password', $name, $pwe->getMessage() );
1664                         }
1665
1666                         $user->addGroup( 'sysop' );
1667                         $user->addGroup( 'bureaucrat' );
1668                         if ( $this->getVar( '_AdminEmail' ) ) {
1669                                 $user->setEmail( $this->getVar( '_AdminEmail' ) );
1670                         }
1671                         $user->saveSettings();
1672
1673                         // Update user count
1674                         $ssUpdate = new SiteStatsUpdate( 0, 0, 0, 0, 1 );
1675                         $ssUpdate->doUpdate();
1676                 }
1677                 $status = Status::newGood();
1678
1679                 if ( $this->getVar( '_Subscribe' ) && $this->getVar( '_AdminEmail' ) ) {
1680                         $this->subscribeToMediaWikiAnnounce( $status );
1681                 }
1682
1683                 return $status;
1684         }
1685
1686         /**
1687          * @param Status $s
1688          */
1689         private function subscribeToMediaWikiAnnounce( Status $s ) {
1690                 $params = array(
1691                         'email' => $this->getVar( '_AdminEmail' ),
1692                         'language' => 'en',
1693                         'digest' => 0
1694                 );
1695
1696                 // Mailman doesn't support as many languages as we do, so check to make
1697                 // sure their selected language is available
1698                 $myLang = $this->getVar( '_UserLang' );
1699                 if ( in_array( $myLang, $this->mediaWikiAnnounceLanguages ) ) {
1700                         $myLang = $myLang == 'pt-br' ? 'pt_BR' : $myLang; // rewrite to Mailman's pt_BR
1701                         $params['language'] = $myLang;
1702                 }
1703
1704                 if ( MWHttpRequest::canMakeRequests() ) {
1705                         $res = MWHttpRequest::factory( $this->mediaWikiAnnounceUrl,
1706                                 array( 'method' => 'POST', 'postData' => $params ) )->execute();
1707                         if ( !$res->isOK() ) {
1708                                 $s->warning( 'config-install-subscribe-fail', $res->getMessage() );
1709                         }
1710                 } else {
1711                         $s->warning( 'config-install-subscribe-notpossible' );
1712                 }
1713         }
1714
1715         /**
1716          * Insert Main Page with default content.
1717          *
1718          * @param DatabaseInstaller $installer
1719          * @return Status
1720          */
1721         protected function createMainpage( DatabaseInstaller $installer ) {
1722                 $status = Status::newGood();
1723                 try {
1724                         $page = WikiPage::factory( Title::newMainPage() );
1725                         $content = new WikitextContent(
1726                                 wfMessage( 'mainpagetext' )->inContentLanguage()->text() . "\n\n" .
1727                                 wfMessage( 'mainpagedocfooter' )->inContentLanguage()->text()
1728                         );
1729
1730                         $page->doEditContent( $content,
1731                                 '',
1732                                 EDIT_NEW,
1733                                 false,
1734                                 User::newFromName( 'MediaWiki default' )
1735                         );
1736                 } catch ( MWException $e ) {
1737                         //using raw, because $wgShowExceptionDetails can not be set yet
1738                         $status->fatal( 'config-install-mainpage-failed', $e->getMessage() );
1739                 }
1740
1741                 return $status;
1742         }
1743
1744         /**
1745          * Override the necessary bits of the config to run an installation.
1746          */
1747         public static function overrideConfig() {
1748                 define( 'MW_NO_SESSION', 1 );
1749
1750                 // Don't access the database
1751                 $GLOBALS['wgUseDatabaseMessages'] = false;
1752                 // Don't cache langconv tables
1753                 $GLOBALS['wgLanguageConverterCacheType'] = CACHE_NONE;
1754                 // Debug-friendly
1755                 $GLOBALS['wgShowExceptionDetails'] = true;
1756                 // Don't break forms
1757                 $GLOBALS['wgExternalLinkTarget'] = '_blank';
1758
1759                 // Extended debugging
1760                 $GLOBALS['wgShowSQLErrors'] = true;
1761                 $GLOBALS['wgShowDBErrorBacktrace'] = true;
1762
1763                 // Allow multiple ob_flush() calls
1764                 $GLOBALS['wgDisableOutputCompression'] = true;
1765
1766                 // Use a sensible cookie prefix (not my_wiki)
1767                 $GLOBALS['wgCookiePrefix'] = 'mw_installer';
1768
1769                 // Some of the environment checks make shell requests, remove limits
1770                 $GLOBALS['wgMaxShellMemory'] = 0;
1771
1772                 // Don't bother embedding images into generated CSS, which is not cached
1773                 $GLOBALS['wgResourceLoaderLESSFunctions']['embeddable'] = function ( $frame, $less ) {
1774                         return $less->toBool( false );
1775                 };
1776         }
1777
1778         /**
1779          * Add an installation step following the given step.
1780          *
1781          * @param callable $callback A valid installation callback array, in this form:
1782          *    array( 'name' => 'some-unique-name', 'callback' => array( $obj, 'function' ) );
1783          * @param string $findStep The step to find. Omit to put the step at the beginning
1784          */
1785         public function addInstallStep( $callback, $findStep = 'BEGINNING' ) {
1786                 $this->extraInstallSteps[$findStep][] = $callback;
1787         }
1788
1789         /**
1790          * Disable the time limit for execution.
1791          * Some long-running pages (Install, Upgrade) will want to do this
1792          */
1793         protected function disableTimeLimit() {
1794                 wfSuppressWarnings();
1795                 set_time_limit( 0 );
1796                 wfRestoreWarnings();
1797         }
1798 }