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                 'envCheckMagicSybase',
 123                 'envCheckMbstring',
 124                 'envCheckSafeMode',
 125                 'envCheckXML',
 126                 'envCheckPCRE',
 127                 'envCheckMemory',
 128                 'envCheckCache',
 129                 'envCheckModSecurity',
 130                 'envCheckDiff3',
 131                 'envCheckGraphics',
 132                 'envCheckGit',
 133                 'envCheckServer',
 134                 'envCheckPath',
 135                 'envCheckShellLocale',
 136                 'envCheckUploadsDirectory',
 137                 'envCheckLibicu',
 138                 'envCheckSuhosinMaxValueLength',
 139                 'envCheckCtype',
 140                 'envCheckIconv',
 141                 'envCheckJSON',
 142         );
 143
 144         /**
 145          * A list of environment preparation methods called by doEnvironmentPreps().
 146          *
 147          * @var array
 148          */
 149         protected $envPreps = array(
 150                 'envPrepExtension',
 151                 'envPrepServer',
 152                 'envPrepPath',
 153         );
 154
 155         /**
 156          * MediaWiki configuration globals that will eventually be passed through
 157          * to LocalSettings.php. The names only are given here, the defaults
 158          * typically come from DefaultSettings.php.
 159          *
 160          * @var array
 161          */
 162         protected $defaultVarNames = array(
 163                 'wgSitename',
 164                 'wgPasswordSender',
 165                 'wgLanguageCode',
 166                 'wgRightsIcon',
 167                 'wgRightsText',
 168                 'wgRightsUrl',
 169                 'wgMainCacheType',
 170                 'wgEnableEmail',
 171                 'wgEnableUserEmail',
 172                 'wgEnotifUserTalk',
 173                 'wgEnotifWatchlist',
 174                 'wgEmailAuthentication',
 175                 'wgDBtype',
 176                 'wgDiff3',
 177                 'wgImageMagickConvertCommand',
 178                 'wgGitBin',
 179                 'IP',
 180                 'wgScriptPath',
 181                 'wgScriptExtension',
 182                 'wgMetaNamespace',
 183                 'wgDeletedDirectory',
 184                 'wgEnableUploads',
 185                 'wgShellLocale',
 186                 'wgSecretKey',
 187                 'wgUseInstantCommons',
 188                 'wgUpgradeKey',
 189                 'wgDefaultSkin',
 190                 'wgResourceLoaderMaxQueryLength',
 191         );
 192
 193         /**
 194          * Variables that are stored alongside globals, and are used for any
 195          * configuration of the installation process aside from the MediaWiki
 196          * configuration. Map of names to defaults.
 197          *
 198          * @var array
 199          */
 200         protected $internalDefaults = array(
 201                 '_UserLang' => 'en',
 202                 '_Environment' => false,
 203                 '_SafeMode' => false,
 204                 '_RaiseMemory' => false,
 205                 '_UpgradeDone' => false,
 206                 '_InstallDone' => false,
 207                 '_Caches' => array(),
 208                 '_InstallPassword' => '',
 209                 '_SameAccount' => true,
 210                 '_CreateDBAccount' => false,
 211                 '_NamespaceType' => 'site-name',
 212                 '_AdminName' => '', // will be set later, when the user selects language
 213                 '_AdminPassword' => '',
 214                 '_AdminPasswordConfirm' => '',
 215                 '_AdminEmail' => '',
 216                 '_Subscribe' => false,
 217                 '_SkipOptional' => 'continue',
 218                 '_RightsProfile' => 'wiki',
 219                 '_LicenseCode' => 'none',
 220                 '_CCDone' => false,
 221                 '_Extensions' => array(),
 222                 '_Skins' => array(),
 223                 '_MemCachedServers' => '',
 224                 '_UpgradeKeySupplied' => false,
 225                 '_ExistingDBSettings' => false,
 226
 227                 // $wgLogo is probably wrong (bug 48084); set something that will work.
 228                 // Single quotes work fine here, as LocalSettingsGenerator outputs this unescaped.
 229                 'wgLogo' => '$wgStylePath/common/images/wiki.png',
 230         );
 231
 232         /**
 233          * The actual list of installation steps. This will be initialized by getInstallSteps()
 234          *
 235          * @var array
 236          */
 237         private $installSteps = array();
 238
 239         /**
 240          * Extra steps for installation, for things like DatabaseInstallers to modify
 241          *
 242          * @var array
 243          */
 244         protected $extraInstallSteps = array();
 245
 246         /**
 247          * Known object cache types and the functions used to test for their existence.
 248          *
 249          * @var array
 250          */
 251         protected $objectCaches = array(
 252                 'xcache' => 'xcache_get',
 253                 'apc' => 'apc_fetch',
 254                 'wincache' => 'wincache_ucache_get'
 255         );
 256
 257         /**
 258          * User rights profiles.
 259          *
 260          * @var array
 261          */
 262         public $rightsProfiles = array(
 263                 'wiki' => array(),
 264                 'no-anon' => array(
 265                         '*' => array( 'edit' => false )
 266                 ),
 267                 'fishbowl' => array(
 268                         '*' => array(
 269                                 'createaccount' => false,
 270                                 'edit' => false,
 271                         ),
 272                 ),
 273                 'private' => array(
 274                         '*' => array(
 275                                 'createaccount' => false,
 276                                 'edit' => false,
 277                                 'read' => false,
 278                         ),
 279                 ),
 280         );
 281
 282         /**
 283          * License types.
 284          *
 285          * @var array
 286          */
 287         public $licenses = array(
 288                 'cc-by' => array(
 289                         'url' => 'http://creativecommons.org/licenses/by/3.0/',
 290                         'icon' => '{$wgStylePath}/common/images/cc-by.png',
 291                 ),
 292                 'cc-by-sa' => array(
 293                         'url' => 'http://creativecommons.org/licenses/by-sa/3.0/',
 294                         'icon' => '{$wgStylePath}/common/images/cc-by-sa.png',
 295                 ),
 296                 'cc-by-nc-sa' => array(
 297                         'url' => 'http://creativecommons.org/licenses/by-nc-sa/3.0/',
 298                         'icon' => '{$wgStylePath}/common/images/cc-by-nc-sa.png',
 299                 ),
 300                 'cc-0' => array(
 301                         'url' => 'https://creativecommons.org/publicdomain/zero/1.0/',
 302                         'icon' => '{$wgStylePath}/common/images/cc-0.png',
 303                 ),
 304                 'pd' => array(
 305                         'url' => '',
 306                         'icon' => '{$wgStylePath}/common/images/public-domain.png',
 307                 ),
 308                 'gfdl' => array(
 309                         'url' => 'http://www.gnu.org/copyleft/fdl.html',
 310                         'icon' => '{$wgStylePath}/common/images/gnu-fdl.png',
 311                 ),
 312                 'none' => array(
 313                         'url' => '',
 314                         'icon' => '',
 315                         'text' => ''
 316                 ),
 317                 'cc-choose' => array(
 318                         // Details will be filled in by the selector.
 319                         'url' => '',
 320                         'icon' => '',
 321                         'text' => '',
 322                 ),
 323         );
 324
 325         /**
 326          * URL to mediawiki-announce subscription
 327          */
 328         protected $mediaWikiAnnounceUrl =
 329                 'https://lists.wikimedia.org/mailman/subscribe/mediawiki-announce';
 330
 331         /**
 332          * Supported language codes for Mailman
 333          */
 334         protected $mediaWikiAnnounceLanguages = array(
 335                 'ca', 'cs', 'da', 'de', 'en', 'es', 'et', 'eu', 'fi', 'fr', 'hr', 'hu',
 336                 'it', 'ja', 'ko', 'lt', 'nl', 'no', 'pl', 'pt', 'pt-br', 'ro', 'ru',
 337                 'sl', 'sr', 'sv', 'tr', 'uk'
 338         );
 339
 340         /**
 341          * UI interface for displaying a short message
 342          * The parameters are like parameters to wfMessage().
 343          * The messages will be in wikitext format, which will be converted to an
 344          * output format such as HTML or text before being sent to the user.
 345          * @param string $msg
 346          */
 347         abstract public function showMessage( $msg /*, ... */ );
 348
 349         /**
 350          * Same as showMessage(), but for displaying errors
 351          * @param string $msg
 352          */
 353         abstract public function showError( $msg /*, ... */ );
 354
 355         /**
 356          * Shows messages to the user through a Status object
 357          * @param Status $status
 358          */
 359         public function showStatusMessage( Status $status ) {
 360                 $errors = array_merge( $status->getErrorsArray(), $status->getWarningsArray() );
 361                 if ( $errors ) {
 362                         foreach ( $errors as $error ) {
 363                                 call_user_func( 'showMessage', $error );
 364                         }
 365                 }
 366         }
 367
 368         /**
 369          * Constructor, always call this from child classes.
 370          */
 371         public function __construct() {
 372                 global $wgMessagesDirs, $wgUser;
 373
 374                 // Disable the i18n cache
 375                 Language::getLocalisationCache()->disableBackend();
 376                 // Disable LoadBalancer and wfGetDB etc.
 377                 LBFactory::disableBackend();
 378
 379                 // Disable object cache (otherwise CACHE_ANYTHING will try CACHE_DB and
 380                 // SqlBagOStuff will then throw since we just disabled wfGetDB)
 381                 $GLOBALS['wgMemc'] = new EmptyBagOStuff;
 382                 ObjectCache::clear();
 383                 $emptyCache = array( 'class' => 'EmptyBagOStuff' );
 384                 $GLOBALS['wgObjectCaches'] = array(
 385                         CACHE_NONE => $emptyCache,
 386                         CACHE_DB => $emptyCache,
 387                         CACHE_ANYTHING => $emptyCache,
 388                         CACHE_MEMCACHED => $emptyCache,
 389                 );
 390
 391                 // Load the installer's i18n.
 392                 $wgMessagesDirs['MediawikiInstaller'] = __DIR__ . '/i18n';
 393
 394                 // Having a user with id = 0 safeguards us from DB access via User::loadOptions().
 395                 $wgUser = User::newFromId( 0 );
 396
 397                 $this->settings = $this->internalDefaults;
 398
 399                 foreach ( $this->defaultVarNames as $var ) {
 400                         $this->settings[$var] = $GLOBALS[$var];
 401                 }
 402
 403                 $this->doEnvironmentPreps();
 404
 405                 $this->compiledDBs = array();
 406                 foreach ( self::getDBTypes() as $type ) {
 407                         $installer = $this->getDBInstaller( $type );
 408
 409                         if ( !$installer->isCompiled() ) {
 410                                 continue;
 411                         }
 412                         $this->compiledDBs[] = $type;
 413                 }
 414
 415                 $this->parserTitle = Title::newFromText( 'Installer' );
 416                 $this->parserOptions = new ParserOptions; // language will be wrong :(
 417                 $this->parserOptions->setEditSection( false );
 418         }
 419
 420         /**
 421          * Get a list of known DB types.
 422          *
 423          * @return array
 424          */
 425         public static function getDBTypes() {
 426                 return self::$dbTypes;
 427         }
 428
 429         /**
 430          * Do initial checks of the PHP environment. Set variables according to
 431          * the observed environment.
 432          *
 433          * It's possible that this may be called under the CLI SAPI, not the SAPI
 434          * that the wiki will primarily run under. In that case, the subclass should
 435          * initialise variables such as wgScriptPath, before calling this function.
 436          *
 437          * Under the web subclass, it can already be assumed that PHP 5+ is in use
 438          * and that sessions are working.
 439          *
 440          * @return Status
 441          */
 442         public function doEnvironmentChecks() {
 443                 // Php version has already been checked by entry scripts
 444                 // Show message here for information purposes
 445                 $this->showMessage( 'config-env-php', PHP_VERSION );
 446
 447                 $good = true;
 448                 // Must go here because an old version of PCRE can prevent other checks from completing
 449                 list( $pcreVersion ) = explode( ' ', PCRE_VERSION, 2 );
 450                 if ( version_compare( $pcreVersion, self::MINIMUM_PCRE_VERSION, '<' ) ) {
 451                         $this->showError( 'config-pcre-old', self::MINIMUM_PCRE_VERSION, $pcreVersion );
 452                         $good = false;
 453                 } else {
 454                         foreach ( $this->envChecks as $check ) {
 455                                 $status = $this->$check();
 456                                 if ( $status === false ) {
 457                                         $good = false;
 458                                 }
 459                         }
 460                 }
 461
 462                 $this->setVar( '_Environment', $good );
 463
 464                 return $good ? Status::newGood() : Status::newFatal( 'config-env-bad' );
 465         }
 466
 467         public function doEnvironmentPreps() {
 468                 foreach ( $this->envPreps as $prep ) {
 469                         $this->$prep();
 470                 }
 471         }
 472
 473         /**
 474          * Set a MW configuration variable, or internal installer configuration variable.
 475          *
 476          * @param string $name
 477          * @param mixed $value
 478          */
 479         public function setVar( $name, $value ) {
 480                 $this->settings[$name] = $value;
 481         }
 482
 483         /**
 484          * Get an MW configuration variable, or internal installer configuration variable.
 485          * The defaults come from $GLOBALS (ultimately DefaultSettings.php).
 486          * Installer variables are typically prefixed by an underscore.
 487          *
 488          * @param string $name
 489          * @param mixed $default
 490          *
 491          * @return mixed
 492          */
 493         public function getVar( $name, $default = null ) {
 494                 if ( !isset( $this->settings[$name] ) ) {
 495                         return $default;
 496                 } else {
 497                         return $this->settings[$name];
 498                 }
 499         }
 500
 501         /**
 502          * Get a list of DBs supported by current PHP setup
 503          *
 504          * @return array
 505          */
 506         public function getCompiledDBs() {
 507                 return $this->compiledDBs;
 508         }
 509
 510         /**
 511          * Get an instance of DatabaseInstaller for the specified DB type.
 512          *
 513          * @param mixed $type DB installer for which is needed, false to use default.
 514          *
 515          * @return DatabaseInstaller
 516          */
 517         public function getDBInstaller( $type = false ) {
 518                 if ( !$type ) {
 519                         $type = $this->getVar( 'wgDBtype' );
 520                 }
 521
 522                 $type = strtolower( $type );
 523
 524                 if ( !isset( $this->dbInstallers[$type] ) ) {
 525                         $class = ucfirst( $type ) . 'Installer';
 526                         $this->dbInstallers[$type] = new $class( $this );
 527                 }
 528
 529                 return $this->dbInstallers[$type];
 530         }
 531
 532         /**
 533          * Determine if LocalSettings.php exists. If it does, return its variables.
 534          *
 535          * @return array
 536          */
 537         public static function getExistingLocalSettings() {
 538                 global $IP;
 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          */
 740         protected function envCheckRegisterGlobals() {
 741                 if ( wfIniGetBool( 'register_globals' ) ) {
 742                         $this->showMessage( 'config-register-globals-error' );
 743                         return false;
 744                 }
 745
 746                 return true;
 747         }
 748
 749         /**
 750          * Some versions of libxml+PHP break < and > encoding horribly
 751          * @return bool
 752          */
 753         protected function envCheckBrokenXML() {
 754                 $test = new PhpXmlBugTester();
 755                 if ( !$test->ok ) {
 756                         $this->showError( 'config-brokenlibxml' );
 757
 758                         return false;
 759                 }
 760
 761                 return true;
 762         }
 763
 764         /**
 765          * Environment check for magic_quotes_runtime.
 766          * @return bool
 767          */
 768         protected function envCheckMagicQuotes() {
 769                 if ( wfIniGetBool( "magic_quotes_runtime" ) ) {
 770                         $this->showError( 'config-magic-quotes-runtime' );
 771
 772                         return false;
 773                 }
 774
 775                 return true;
 776         }
 777
 778         /**
 779          * Environment check for magic_quotes_sybase.
 780          * @return bool
 781          */
 782         protected function envCheckMagicSybase() {
 783                 if ( wfIniGetBool( 'magic_quotes_sybase' ) ) {
 784                         $this->showError( 'config-magic-quotes-sybase' );
 785
 786                         return false;
 787                 }
 788
 789                 return true;
 790         }
 791
 792         /**
 793          * Environment check for mbstring.func_overload.
 794          * @return bool
 795          */
 796         protected function envCheckMbstring() {
 797                 if ( wfIniGetBool( 'mbstring.func_overload' ) ) {
 798                         $this->showError( 'config-mbstring' );
 799
 800                         return false;
 801                 }
 802
 803                 return true;
 804         }
 805
 806         /**
 807          * Environment check for safe_mode.
 808          * @return bool
 809          */
 810         protected function envCheckSafeMode() {
 811                 if ( wfIniGetBool( 'safe_mode' ) ) {
 812                         $this->setVar( '_SafeMode', true );
 813                         $this->showMessage( 'config-safe-mode' );
 814                 }
 815
 816                 return true;
 817         }
 818
 819         /**
 820          * Environment check for the XML module.
 821          * @return bool
 822          */
 823         protected function envCheckXML() {
 824                 if ( !function_exists( "utf8_encode" ) ) {
 825                         $this->showError( 'config-xml-bad' );
 826
 827                         return false;
 828                 }
 829
 830                 return true;
 831         }
 832
 833         /**
 834          * Environment check for the PCRE module.
 835          *
 836          * @note If this check were to fail, the parser would
 837          *   probably throw an exception before the result
 838          *   of this check is shown to the user.
 839          * @return bool
 840          */
 841         protected function envCheckPCRE() {
 842                 wfSuppressWarnings();
 843                 $regexd = preg_replace( '/[\x{0430}-\x{04FF}]/iu', '', '-АБВГД-' );
 844                 // Need to check for \p support too, as PCRE can be compiled
 845                 // with utf8 support, but not unicode property support.
 846                 // check that \p{Zs} (space separators) matches
 847                 // U+3000 (Ideographic space)
 848                 $regexprop = preg_replace( '/\p{Zs}/u', '', "-\xE3\x80\x80-" );
 849                 wfRestoreWarnings();
 850                 if ( $regexd != '--' || $regexprop != '--' ) {
 851                         $this->showError( 'config-pcre-no-utf8' );
 852
 853                         return false;
 854                 }
 855
 856                 return true;
 857         }
 858
 859         /**
 860          * Environment check for available memory.
 861          * @return bool
 862          */
 863         protected function envCheckMemory() {
 864                 $limit = ini_get( 'memory_limit' );
 865
 866                 if ( !$limit || $limit == -1 ) {
 867                         return true;
 868                 }
 869
 870                 $n = wfShorthandToInteger( $limit );
 871
 872                 if ( $n < $this->minMemorySize * 1024 * 1024 ) {
 873                         $newLimit = "{$this->minMemorySize}M";
 874
 875                         if ( ini_set( "memory_limit", $newLimit ) === false ) {
 876                                 $this->showMessage( 'config-memory-bad', $limit );
 877                         } else {
 878                                 $this->showMessage( 'config-memory-raised', $limit, $newLimit );
 879                                 $this->setVar( '_RaiseMemory', true );
 880                         }
 881                 }
 882
 883                 return true;
 884         }
 885
 886         /**
 887          * Environment check for compiled object cache types.
 888          */
 889         protected function envCheckCache() {
 890                 $caches = array();
 891                 foreach ( $this->objectCaches as $name => $function ) {
 892                         if ( function_exists( $function ) ) {
 893                                 if ( $name == 'xcache' && !wfIniGetBool( 'xcache.var_size' ) ) {
 894                                         continue;
 895                                 }
 896                                 $caches[$name] = true;
 897                         }
 898                 }
 899
 900                 if ( !$caches ) {
 901                         $this->showMessage( 'config-no-cache' );
 902                 }
 903
 904                 $this->setVar( '_Caches', $caches );
 905         }
 906
 907         /**
 908          * Scare user to death if they have mod_security
 909          * @return bool
 910          */
 911         protected function envCheckModSecurity() {
 912                 if ( self::apacheModulePresent( 'mod_security' ) ) {
 913                         $this->showMessage( 'config-mod-security' );
 914                 }
 915
 916                 return true;
 917         }
 918
 919         /**
 920          * Search for GNU diff3.
 921          * @return bool
 922          */
 923         protected function envCheckDiff3() {
 924                 $names = array( "gdiff3", "diff3", "diff3.exe" );
 925                 $versionInfo = array( '$1 --version 2>&1', 'GNU diffutils' );
 926
 927                 $diff3 = self::locateExecutableInDefaultPaths( $names, $versionInfo );
 928
 929                 if ( $diff3 ) {
 930                         $this->setVar( 'wgDiff3', $diff3 );
 931                 } else {
 932                         $this->setVar( 'wgDiff3', false );
 933                         $this->showMessage( 'config-diff3-bad' );
 934                 }
 935
 936                 return true;
 937         }
 938
 939         /**
 940          * Environment check for ImageMagick and GD.
 941          * @return bool
 942          */
 943         protected function envCheckGraphics() {
 944                 $names = array( wfIsWindows() ? 'convert.exe' : 'convert' );
 945                 $versionInfo = array( '$1 -version', 'ImageMagick' );
 946                 $convert = self::locateExecutableInDefaultPaths( $names, $versionInfo );
 947
 948                 $this->setVar( 'wgImageMagickConvertCommand', '' );
 949                 if ( $convert ) {
 950                         $this->setVar( 'wgImageMagickConvertCommand', $convert );
 951                         $this->showMessage( 'config-imagemagick', $convert );
 952
 953                         return true;
 954                 } elseif ( function_exists( 'imagejpeg' ) ) {
 955                         $this->showMessage( 'config-gd' );
 956                 } else {
 957                         $this->showMessage( 'config-no-scaling' );
 958                 }
 959
 960                 return true;
 961         }
 962
 963         /**
 964          * Search for git.
 965          *
 966          * @since 1.22
 967          * @return bool
 968          */
 969         protected function envCheckGit() {
 970                 $names = array( wfIsWindows() ? 'git.exe' : 'git' );
 971                 $versionInfo = array( '$1 --version', 'git version' );
 972
 973                 $git = self::locateExecutableInDefaultPaths( $names, $versionInfo );
 974
 975                 if ( $git ) {
 976                         $this->setVar( 'wgGitBin', $git );
 977                         $this->showMessage( 'config-git', $git );
 978                 } else {
 979                         $this->setVar( 'wgGitBin', false );
 980                         $this->showMessage( 'config-git-bad' );
 981                 }
 982
 983                 return true;
 984         }
 985
 986         /**
 987          * Environment check to inform user which server we've assumed.
 988          *
 989          * @return bool
 990          */
 991         protected function envCheckServer() {
 992                 $server = $this->envGetDefaultServer();
 993                 if ( $server !== null ) {
 994                         $this->showMessage( 'config-using-server', $server );
 995                 }
 996                 return true;
 997         }
 998
 999         /**
1000          * Environment check to inform user which paths we've assumed.
1001          *
1002          * @return bool
1003          */
1004         protected function envCheckPath() {
1005                 $this->showMessage(
1006                         'config-using-uri',
1007                         $this->getVar( 'wgServer' ),
1008                         $this->getVar( 'wgScriptPath' )
1009                 );
1010                 return true;
1011         }
1012
1013         /**
1014          * Environment check for preferred locale in shell
1015          * @return bool
1016          */
1017         protected function envCheckShellLocale() {
1018                 $os = php_uname( 's' );
1019                 $supported = array( 'Linux', 'SunOS', 'HP-UX', 'Darwin' ); # Tested these
1020
1021                 if ( !in_array( $os, $supported ) ) {
1022                         return true;
1023                 }
1024
1025                 # Get a list of available locales.
1026                 $ret = false;
1027                 $lines = wfShellExec( '/usr/bin/locale -a', $ret );
1028
1029                 if ( $ret ) {
1030                         return true;
1031                 }
1032
1033                 $lines = array_map( 'trim', explode( "\n", $lines ) );
1034                 $candidatesByLocale = array();
1035                 $candidatesByLang = array();
1036
1037                 foreach ( $lines as $line ) {
1038                         if ( $line === '' ) {
1039                                 continue;
1040                         }
1041
1042                         if ( !preg_match( '/^([a-zA-Z]+)(_[a-zA-Z]+|)\.(utf8|UTF-8)(@[a-zA-Z_]*|)$/i', $line, $m ) ) {
1043                                 continue;
1044                         }
1045
1046                         list( , $lang, , , ) = $m;
1047
1048                         $candidatesByLocale[$m[0]] = $m;
1049                         $candidatesByLang[$lang][] = $m;
1050                 }
1051
1052                 # Try the current value of LANG.
1053                 if ( isset( $candidatesByLocale[getenv( 'LANG' )] ) ) {
1054                         $this->setVar( 'wgShellLocale', getenv( 'LANG' ) );
1055
1056                         return true;
1057                 }
1058
1059                 # Try the most common ones.
1060                 $commonLocales = array( 'en_US.UTF-8', 'en_US.utf8', 'de_DE.UTF-8', 'de_DE.utf8' );
1061                 foreach ( $commonLocales as $commonLocale ) {
1062                         if ( isset( $candidatesByLocale[$commonLocale] ) ) {
1063                                 $this->setVar( 'wgShellLocale', $commonLocale );
1064
1065                                 return true;
1066                         }
1067                 }
1068
1069                 # Is there an available locale in the Wiki's language?
1070                 $wikiLang = $this->getVar( 'wgLanguageCode' );
1071
1072                 if ( isset( $candidatesByLang[$wikiLang] ) ) {
1073                         $m = reset( $candidatesByLang[$wikiLang] );
1074                         $this->setVar( 'wgShellLocale', $m[0] );
1075
1076                         return true;
1077                 }
1078
1079                 # Are there any at all?
1080                 if ( count( $candidatesByLocale ) ) {
1081                         $m = reset( $candidatesByLocale );
1082                         $this->setVar( 'wgShellLocale', $m[0] );
1083
1084                         return true;
1085                 }
1086
1087                 # Give up.
1088                 return true;
1089         }
1090
1091         /**
1092          * Environment check for the permissions of the uploads directory
1093          * @return bool
1094          */
1095         protected function envCheckUploadsDirectory() {
1096                 global $IP;
1097
1098                 $dir = $IP . '/images/';
1099                 $url = $this->getVar( 'wgServer' ) . $this->getVar( 'wgScriptPath' ) . '/images/';
1100                 $safe = !$this->dirIsExecutable( $dir, $url );
1101
1102                 if ( !$safe ) {
1103                         $this->showMessage( 'config-uploads-not-safe', $dir );
1104                 }
1105
1106                 return true;
1107         }
1108
1109         /**
1110          * Checks if suhosin.get.max_value_length is set, and if so generate
1111          * a warning because it decreases ResourceLoader performance.
1112          * @return bool
1113          */
1114         protected function envCheckSuhosinMaxValueLength() {
1115                 $maxValueLength = ini_get( 'suhosin.get.max_value_length' );
1116                 if ( $maxValueLength > 0 && $maxValueLength < 1024 ) {
1117                         // Only warn if the value is below the sane 1024
1118                         $this->showMessage( 'config-suhosin-max-value-length', $maxValueLength );
1119                 }
1120
1121                 return true;
1122         }
1123
1124         /**
1125          * Convert a hex string representing a Unicode code point to that code point.
1126          * @param string $c
1127          * @return string
1128          */
1129         protected function unicodeChar( $c ) {
1130                 $c = hexdec( $c );
1131                 if ( $c <= 0x7F ) {
1132                         return chr( $c );
1133                 } elseif ( $c <= 0x7FF ) {
1134                         return chr( 0xC0 | $c >> 6 ) . chr( 0x80 | $c & 0x3F );
1135                 } elseif ( $c <= 0xFFFF ) {
1136                         return chr( 0xE0 | $c >> 12 ) . chr( 0x80 | $c >> 6 & 0x3F )
1137                         . chr( 0x80 | $c & 0x3F );
1138                 } elseif ( $c <= 0x10FFFF ) {
1139                         return chr( 0xF0 | $c >> 18 ) . chr( 0x80 | $c >> 12 & 0x3F )
1140                         . chr( 0x80 | $c >> 6 & 0x3F )
1141                         . chr( 0x80 | $c & 0x3F );
1142                 } else {
1143                         return false;
1144                 }
1145         }
1146
1147         /**
1148          * Check the libicu version
1149          */
1150         protected function envCheckLibicu() {
1151                 $utf8 = function_exists( 'utf8_normalize' );
1152                 $intl = function_exists( 'normalizer_normalize' );
1153
1154                 /**
1155                  * This needs to be updated something that the latest libicu
1156                  * will properly normalize.  This normalization was found at
1157                  * http://www.unicode.org/versions/Unicode5.2.0/#Character_Additions
1158                  * Note that we use the hex representation to create the code
1159                  * points in order to avoid any Unicode-destroying during transit.
1160                  */
1161                 $not_normal_c = $this->unicodeChar( "FA6C" );
1162                 $normal_c = $this->unicodeChar( "242EE" );
1163
1164                 $useNormalizer = 'php';
1165                 $needsUpdate = false;
1166
1167                 /**
1168                  * We're going to prefer the pecl extension here unless
1169                  * utf8_normalize is more up to date.
1170                  */
1171                 if ( $utf8 ) {
1172                         $useNormalizer = 'utf8';
1173                         $utf8 = utf8_normalize( $not_normal_c, UtfNormal::UNORM_NFC );
1174                         if ( $utf8 !== $normal_c ) {
1175                                 $needsUpdate = true;
1176                         }
1177                 }
1178                 if ( $intl ) {
1179                         $useNormalizer = 'intl';
1180                         $intl = normalizer_normalize( $not_normal_c, Normalizer::FORM_C );
1181                         if ( $intl !== $normal_c ) {
1182                                 $needsUpdate = true;
1183                         }
1184                 }
1185
1186                 // Uses messages 'config-unicode-using-php', 'config-unicode-using-utf8',
1187                 // 'config-unicode-using-intl'
1188                 if ( $useNormalizer === 'php' ) {
1189                         $this->showMessage( 'config-unicode-pure-php-warning' );
1190                 } else {
1191                         $this->showMessage( 'config-unicode-using-' . $useNormalizer );
1192                         if ( $needsUpdate ) {
1193                                 $this->showMessage( 'config-unicode-update-warning' );
1194                         }
1195                 }
1196         }
1197
1198         /**
1199          * @return bool
1200          */
1201         protected function envCheckCtype() {
1202                 if ( !function_exists( 'ctype_digit' ) ) {
1203                         $this->showError( 'config-ctype' );
1204
1205                         return false;
1206                 }
1207
1208                 return true;
1209         }
1210
1211         /**
1212          * @return bool
1213          */
1214         protected function envCheckIconv() {
1215                 if ( !function_exists( 'iconv' ) ) {
1216                         $this->showError( 'config-iconv' );
1217
1218                         return false;
1219                 }
1220
1221                 return true;
1222         }
1223
1224         /**
1225          * @return bool
1226          */
1227         protected function envCheckJSON() {
1228                 if ( !function_exists( 'json_decode' ) ) {
1229                         $this->showError( 'config-json' );
1230
1231                         return false;
1232                 }
1233
1234                 return true;
1235         }
1236
1237         /**
1238          * Environment prep for the server hostname.
1239          */
1240         protected function envPrepServer() {
1241                 $server = $this->envGetDefaultServer();
1242                 if ( $server !== null ) {
1243                         $this->setVar( 'wgServer', $server );
1244                 }
1245         }
1246
1247         /**
1248          * Helper function to be called from envPrepServer()
1249          * @return string
1250          */
1251         abstract protected function envGetDefaultServer();
1252
1253         /**
1254          * Environment prep for setting the preferred PHP file extension.
1255          */
1256         protected function envPrepExtension() {
1257                 // @todo FIXME: Detect this properly
1258                 if ( defined( 'MW_INSTALL_PHP5_EXT' ) ) {
1259                         $ext = '.php5';
1260                 } else {
1261                         $ext = '.php';
1262                 }
1263                 $this->setVar( 'wgScriptExtension', $ext );
1264         }
1265
1266         /**
1267          * Environment prep for setting $IP and $wgScriptPath.
1268          */
1269         protected function envPrepPath() {
1270                 global $IP;
1271                 $IP = dirname( dirname( __DIR__ ) );
1272                 $this->setVar( 'IP', $IP );
1273         }
1274
1275         /**
1276          * Get an array of likely places we can find executables. Check a bunch
1277          * of known Unix-like defaults, as well as the PATH environment variable
1278          * (which should maybe make it work for Windows?)
1279          *
1280          * @return array
1281          */
1282         protected static function getPossibleBinPaths() {
1283                 return array_merge(
1284                         array( '/usr/bin', '/usr/local/bin', '/opt/csw/bin',
1285                                 '/usr/gnu/bin', '/usr/sfw/bin', '/sw/bin', '/opt/local/bin' ),
1286                         explode( PATH_SEPARATOR, getenv( 'PATH' ) )
1287                 );
1288         }
1289
1290         /**
1291          * Search a path for any of the given executable names. Returns the
1292          * executable name if found. Also checks the version string returned
1293          * by each executable.
1294          *
1295          * Used only by environment checks.
1296          *
1297          * @param string $path path to search
1298          * @param array $names of executable names
1299          * @param array|bool $versionInfo False or array with two members:
1300          *   0 => Command to run for version check, with $1 for the full executable name
1301          *   1 => String to compare the output with
1302          *
1303          * If $versionInfo is not false, only executables with a version
1304          * matching $versionInfo[1] will be returned.
1305          * @return bool|string
1306          */
1307         public static function locateExecutable( $path, $names, $versionInfo = false ) {
1308                 if ( !is_array( $names ) ) {
1309                         $names = array( $names );
1310                 }
1311
1312                 foreach ( $names as $name ) {
1313                         $command = $path . DIRECTORY_SEPARATOR . $name;
1314
1315                         wfSuppressWarnings();
1316                         $file_exists = file_exists( $command );
1317                         wfRestoreWarnings();
1318
1319                         if ( $file_exists ) {
1320                                 if ( !$versionInfo ) {
1321                                         return $command;
1322                                 }
1323
1324                                 $file = str_replace( '$1', wfEscapeShellArg( $command ), $versionInfo[0] );
1325                                 if ( strstr( wfShellExec( $file ), $versionInfo[1] ) !== false ) {
1326                                         return $command;
1327                                 }
1328                         }
1329                 }
1330
1331                 return false;
1332         }
1333
1334         /**
1335          * Same as locateExecutable(), but checks in getPossibleBinPaths() by default
1336          * @see locateExecutable()
1337          * @param array $names Array of possible names.
1338          * @param array|bool $versionInfo Default: false or array with two members:
1339          *   0 => Command to run for version check, with $1 for the full executable name
1340          *   1 => String to compare the output with
1341          *
1342          * If $versionInfo is not false, only executables with a version
1343          * matching $versionInfo[1] will be returned.
1344          * @return bool|string
1345          */
1346         public static function locateExecutableInDefaultPaths( $names, $versionInfo = false ) {
1347                 foreach ( self::getPossibleBinPaths() as $path ) {
1348                         $exe = self::locateExecutable( $path, $names, $versionInfo );
1349                         if ( $exe !== false ) {
1350                                 return $exe;
1351                         }
1352                 }
1353
1354                 return false;
1355         }
1356
1357         /**
1358          * Checks if scripts located in the given directory can be executed via the given URL.
1359          *
1360          * Used only by environment checks.
1361          * @param string $dir
1362          * @param string $url
1363          * @return bool|int|string
1364          */
1365         public function dirIsExecutable( $dir, $url ) {
1366                 $scriptTypes = array(
1367                         'php' => array(
1368                                 "<?php echo 'ex' . 'ec';",
1369                                 "#!/var/env php5\n<?php echo 'ex' . 'ec';",
1370                         ),
1371                 );
1372
1373                 // it would be good to check other popular languages here, but it'll be slow.
1374
1375                 wfSuppressWarnings();
1376
1377                 foreach ( $scriptTypes as $ext => $contents ) {
1378                         foreach ( $contents as $source ) {
1379                                 $file = 'exectest.' . $ext;
1380
1381                                 if ( !file_put_contents( $dir . $file, $source ) ) {
1382                                         break;
1383                                 }
1384
1385                                 try {
1386                                         $text = Http::get( $url . $file, array( 'timeout' => 3 ) );
1387                                 } catch ( MWException $e ) {
1388                                         // Http::get throws with allow_url_fopen = false and no curl extension.
1389                                         $text = null;
1390                                 }
1391                                 unlink( $dir . $file );
1392
1393                                 if ( $text == 'exec' ) {
1394                                         wfRestoreWarnings();
1395
1396                                         return $ext;
1397                                 }
1398                         }
1399                 }
1400
1401                 wfRestoreWarnings();
1402
1403                 return false;
1404         }
1405
1406         /**
1407          * Checks for presence of an Apache module. Works only if PHP is running as an Apache module, too.
1408          *
1409          * @param string $moduleName Name of module to check.
1410          * @return bool
1411          */
1412         public static function apacheModulePresent( $moduleName ) {
1413                 if ( function_exists( 'apache_get_modules' ) && in_array( $moduleName, apache_get_modules() ) ) {
1414                         return true;
1415                 }
1416                 // try it the hard way
1417                 ob_start();
1418                 phpinfo( INFO_MODULES );
1419                 $info = ob_get_clean();
1420
1421                 return strpos( $info, $moduleName ) !== false;
1422         }
1423
1424         /**
1425          * ParserOptions are constructed before we determined the language, so fix it
1426          *
1427          * @param Language $lang
1428          */
1429         public function setParserLanguage( $lang ) {
1430                 $this->parserOptions->setTargetLanguage( $lang );
1431                 $this->parserOptions->setUserLang( $lang );
1432         }
1433
1434         /**
1435          * Overridden by WebInstaller to provide lastPage parameters.
1436          * @param string $page
1437          * @return string
1438          */
1439         protected function getDocUrl( $page ) {
1440                 return "{$_SERVER['PHP_SELF']}?page=" . urlencode( $page );
1441         }
1442
1443         /**
1444          * Finds extensions that follow the format /$directory/Name/Name.php,
1445          * and returns an array containing the value for 'Name' for each found extension.
1446          *
1447          * Reasonable values for $directory include 'extensions' (the default) and 'skins'.
1448          *
1449          * @param string $directory Directory to search in
1450          * @return array
1451          */
1452         public function findExtensions( $directory = 'extensions' ) {
1453                 if ( $this->getVar( 'IP' ) === null ) {
1454                         return array();
1455                 }
1456
1457                 $extDir = $this->getVar( 'IP' ) . '/' . $directory;
1458                 if ( !is_readable( $extDir ) || !is_dir( $extDir ) ) {
1459                         return array();
1460                 }
1461
1462                 $dh = opendir( $extDir );
1463                 $exts = array();
1464                 while ( ( $file = readdir( $dh ) ) !== false ) {
1465                         if ( !is_dir( "$extDir/$file" ) ) {
1466                                 continue;
1467                         }
1468                         if ( file_exists( "$extDir/$file/$file.php" ) ) {
1469                                 $exts[] = $file;
1470                         }
1471                 }
1472                 closedir( $dh );
1473                 natcasesort( $exts );
1474
1475                 return $exts;
1476         }
1477
1478         /**
1479          * Installs the auto-detected extensions.
1480          *
1481          * @return Status
1482          */
1483         protected function includeExtensions() {
1484                 global $IP;
1485                 $exts = $this->getVar( '_Extensions' );
1486                 $IP = $this->getVar( 'IP' );
1487
1488                 /**
1489                  * We need to include DefaultSettings before including extensions to avoid
1490                  * warnings about unset variables. However, the only thing we really
1491                  * want here is $wgHooks['LoadExtensionSchemaUpdates']. This won't work
1492                  * if the extension has hidden hook registration in $wgExtensionFunctions,
1493                  * but we're not opening that can of worms
1494                  * @see https://bugzilla.wikimedia.org/show_bug.cgi?id=26857
1495                  */
1496                 global $wgAutoloadClasses;
1497                 $wgAutoloadClasses = array();
1498
1499                 require "$IP/includes/DefaultSettings.php";
1500
1501                 foreach ( $exts as $e ) {
1502                         require_once "$IP/extensions/$e/$e.php";
1503                 }
1504
1505                 $hooksWeWant = isset( $wgHooks['LoadExtensionSchemaUpdates'] ) ?
1506                         $wgHooks['LoadExtensionSchemaUpdates'] : array();
1507
1508                 // Unset everyone else's hooks. Lord knows what someone might be doing
1509                 // in ParserFirstCallInit (see bug 27171)
1510                 $GLOBALS['wgHooks'] = array( 'LoadExtensionSchemaUpdates' => $hooksWeWant );
1511
1512                 return Status::newGood();
1513         }
1514
1515         /**
1516          * Get an array of install steps. Should always be in the format of
1517          * array(
1518          *   'name'     => 'someuniquename',
1519          *   'callback' => array( $obj, 'method' ),
1520          * )
1521          * There must be a config-install-$name message defined per step, which will
1522          * be shown on install.
1523          *
1524          * @param DatabaseInstaller $installer DatabaseInstaller so we can make callbacks
1525          * @return array
1526          */
1527         protected function getInstallSteps( DatabaseInstaller $installer ) {
1528                 $coreInstallSteps = array(
1529                         array( 'name' => 'database', 'callback' => array( $installer, 'setupDatabase' ) ),
1530                         array( 'name' => 'tables', 'callback' => array( $installer, 'createTables' ) ),
1531                         array( 'name' => 'interwiki', 'callback' => array( $installer, 'populateInterwikiTable' ) ),
1532                         array( 'name' => 'stats', 'callback' => array( $this, 'populateSiteStats' ) ),
1533                         array( 'name' => 'keys', 'callback' => array( $this, 'generateKeys' ) ),
1534                         array( 'name' => 'sysop', 'callback' => array( $this, 'createSysop' ) ),
1535                         array( 'name' => 'mainpage', 'callback' => array( $this, 'createMainpage' ) ),
1536                 );
1537
1538                 // Build the array of install steps starting from the core install list,
1539                 // then adding any callbacks that wanted to attach after a given step
1540                 foreach ( $coreInstallSteps as $step ) {
1541                         $this->installSteps[] = $step;
1542                         if ( isset( $this->extraInstallSteps[$step['name']] ) ) {
1543                                 $this->installSteps = array_merge(
1544                                         $this->installSteps,
1545                                         $this->extraInstallSteps[$step['name']]
1546                                 );
1547                         }
1548                 }
1549
1550                 // Prepend any steps that want to be at the beginning
1551                 if ( isset( $this->extraInstallSteps['BEGINNING'] ) ) {
1552                         $this->installSteps = array_merge(
1553                                 $this->extraInstallSteps['BEGINNING'],
1554                                 $this->installSteps
1555                         );
1556                 }
1557
1558                 // Extensions should always go first, chance to tie into hooks and such
1559                 if ( count( $this->getVar( '_Extensions' ) ) ) {
1560                         array_unshift( $this->installSteps,
1561                                 array( 'name' => 'extensions', 'callback' => array( $this, 'includeExtensions' ) )
1562                         );
1563                         $this->installSteps[] = array(
1564                                 'name' => 'extension-tables',
1565                                 'callback' => array( $installer, 'createExtensionTables' )
1566                         );
1567                 }
1568
1569                 return $this->installSteps;
1570         }
1571
1572         /**
1573          * Actually perform the installation.
1574          *
1575          * @param callable $startCB A callback array for the beginning of each step
1576          * @param callable $endCB A callback array for the end of each step
1577          *
1578          * @return array Array of Status objects
1579          */
1580         public function performInstallation( $startCB, $endCB ) {
1581                 $installResults = array();
1582                 $installer = $this->getDBInstaller();
1583                 $installer->preInstall();
1584                 $steps = $this->getInstallSteps( $installer );
1585                 foreach ( $steps as $stepObj ) {
1586                         $name = $stepObj['name'];
1587                         call_user_func_array( $startCB, array( $name ) );
1588
1589                         // Perform the callback step
1590                         $status = call_user_func( $stepObj['callback'], $installer );
1591
1592                         // Output and save the results
1593                         call_user_func( $endCB, $name, $status );
1594                         $installResults[$name] = $status;
1595
1596                         // If we've hit some sort of fatal, we need to bail.
1597                         // Callback already had a chance to do output above.
1598                         if ( !$status->isOk() ) {
1599                                 break;
1600                         }
1601                 }
1602                 if ( $status->isOk() ) {
1603                         $this->setVar( '_InstallDone', true );
1604                 }
1605
1606                 return $installResults;
1607         }
1608
1609         /**
1610          * Generate $wgSecretKey. Will warn if we had to use an insecure random source.
1611          *
1612          * @return Status
1613          */
1614         public function generateKeys() {
1615                 $keys = array( 'wgSecretKey' => 64 );
1616                 if ( strval( $this->getVar( 'wgUpgradeKey' ) ) === '' ) {
1617                         $keys['wgUpgradeKey'] = 16;
1618                 }
1619
1620                 return $this->doGenerateKeys( $keys );
1621         }
1622
1623         /**
1624          * Generate a secret value for variables using our CryptRand generator.
1625          * Produce a warning if the random source was insecure.
1626          *
1627          * @param array $keys
1628          * @return Status
1629          */
1630         protected function doGenerateKeys( $keys ) {
1631                 $status = Status::newGood();
1632
1633                 $strong = true;
1634                 foreach ( $keys as $name => $length ) {
1635                         $secretKey = MWCryptRand::generateHex( $length, true );
1636                         if ( !MWCryptRand::wasStrong() ) {
1637                                 $strong = false;
1638                         }
1639
1640                         $this->setVar( $name, $secretKey );
1641                 }
1642
1643                 if ( !$strong ) {
1644                         $names = array_keys( $keys );
1645                         $names = preg_replace( '/^(.*)$/', '\$$1', $names );
1646                         global $wgLang;
1647                         $status->warning( 'config-insecure-keys', $wgLang->listToText( $names ), count( $names ) );
1648                 }
1649
1650                 return $status;
1651         }
1652
1653         /**
1654          * Create the first user account, grant it sysop and bureaucrat rights
1655          *
1656          * @return Status
1657          */
1658         protected function createSysop() {
1659                 $name = $this->getVar( '_AdminName' );
1660                 $user = User::newFromName( $name );
1661
1662                 if ( !$user ) {
1663                         // We should've validated this earlier anyway!
1664                         return Status::newFatal( 'config-admin-error-user', $name );
1665                 }
1666
1667                 if ( $user->idForName() == 0 ) {
1668                         $user->addToDatabase();
1669
1670                         try {
1671                                 $user->setPassword( $this->getVar( '_AdminPassword' ) );
1672                         } catch ( PasswordError $pwe ) {
1673                                 return Status::newFatal( 'config-admin-error-password', $name, $pwe->getMessage() );
1674                         }
1675
1676                         $user->addGroup( 'sysop' );
1677                         $user->addGroup( 'bureaucrat' );
1678                         if ( $this->getVar( '_AdminEmail' ) ) {
1679                                 $user->setEmail( $this->getVar( '_AdminEmail' ) );
1680                         }
1681                         $user->saveSettings();
1682
1683                         // Update user count
1684                         $ssUpdate = new SiteStatsUpdate( 0, 0, 0, 0, 1 );
1685                         $ssUpdate->doUpdate();
1686                 }
1687                 $status = Status::newGood();
1688
1689                 if ( $this->getVar( '_Subscribe' ) && $this->getVar( '_AdminEmail' ) ) {
1690                         $this->subscribeToMediaWikiAnnounce( $status );
1691                 }
1692
1693                 return $status;
1694         }
1695
1696         /**
1697          * @param Status $s
1698          */
1699         private function subscribeToMediaWikiAnnounce( Status $s ) {
1700                 $params = array(
1701                         'email' => $this->getVar( '_AdminEmail' ),
1702                         'language' => 'en',
1703                         'digest' => 0
1704                 );
1705
1706                 // Mailman doesn't support as many languages as we do, so check to make
1707                 // sure their selected language is available
1708                 $myLang = $this->getVar( '_UserLang' );
1709                 if ( in_array( $myLang, $this->mediaWikiAnnounceLanguages ) ) {
1710                         $myLang = $myLang == 'pt-br' ? 'pt_BR' : $myLang; // rewrite to Mailman's pt_BR
1711                         $params['language'] = $myLang;
1712                 }
1713
1714                 if ( MWHttpRequest::canMakeRequests() ) {
1715                         $res = MWHttpRequest::factory( $this->mediaWikiAnnounceUrl,
1716                                 array( 'method' => 'POST', 'postData' => $params ) )->execute();
1717                         if ( !$res->isOK() ) {
1718                                 $s->warning( 'config-install-subscribe-fail', $res->getMessage() );
1719                         }
1720                 } else {
1721                         $s->warning( 'config-install-subscribe-notpossible' );
1722                 }
1723         }
1724
1725         /**
1726          * Insert Main Page with default content.
1727          *
1728          * @param DatabaseInstaller $installer
1729          * @return Status
1730          */
1731         protected function createMainpage( DatabaseInstaller $installer ) {
1732                 $status = Status::newGood();
1733                 try {
1734                         $page = WikiPage::factory( Title::newMainPage() );
1735                         $content = new WikitextContent(
1736                                 wfMessage( 'mainpagetext' )->inContentLanguage()->text() . "\n\n" .
1737                                 wfMessage( 'mainpagedocfooter' )->inContentLanguage()->text()
1738                         );
1739
1740                         $page->doEditContent( $content,
1741                                 '',
1742                                 EDIT_NEW,
1743                                 false,
1744                                 User::newFromName( 'MediaWiki default' )
1745                         );
1746                 } catch ( MWException $e ) {
1747                         //using raw, because $wgShowExceptionDetails can not be set yet
1748                         $status->fatal( 'config-install-mainpage-failed', $e->getMessage() );
1749                 }
1750
1751                 return $status;
1752         }
1753
1754         /**
1755          * Override the necessary bits of the config to run an installation.
1756          */
1757         public static function overrideConfig() {
1758                 define( 'MW_NO_SESSION', 1 );
1759
1760                 // Don't access the database
1761                 $GLOBALS['wgUseDatabaseMessages'] = false;
1762                 // Don't cache langconv tables
1763                 $GLOBALS['wgLanguageConverterCacheType'] = CACHE_NONE;
1764                 // Debug-friendly
1765                 $GLOBALS['wgShowExceptionDetails'] = true;
1766                 // Don't break forms
1767                 $GLOBALS['wgExternalLinkTarget'] = '_blank';
1768
1769                 // Extended debugging
1770                 $GLOBALS['wgShowSQLErrors'] = true;
1771                 $GLOBALS['wgShowDBErrorBacktrace'] = true;
1772
1773                 // Allow multiple ob_flush() calls
1774                 $GLOBALS['wgDisableOutputCompression'] = true;
1775
1776                 // Use a sensible cookie prefix (not my_wiki)
1777                 $GLOBALS['wgCookiePrefix'] = 'mw_installer';
1778
1779                 // Some of the environment checks make shell requests, remove limits
1780                 $GLOBALS['wgMaxShellMemory'] = 0;
1781
1782                 // Don't bother embedding images into generated CSS, which is not cached
1783                 $GLOBALS['wgResourceLoaderLESSFunctions']['embeddable'] = function ( $frame, $less ) {
1784                         return $less->toBool( false );
1785                 };
1786         }
1787
1788         /**
1789          * Add an installation step following the given step.
1790          *
1791          * @param callable $callback A valid installation callback array, in this form:
1792          *    array( 'name' => 'some-unique-name', 'callback' => array( $obj, 'function' ) );
1793          * @param string $findStep The step to find. Omit to put the step at the beginning
1794          */
1795         public function addInstallStep( $callback, $findStep = 'BEGINNING' ) {
1796                 $this->extraInstallSteps[$findStep][] = $callback;
1797         }
1798
1799         /**
1800          * Disable the time limit for execution.
1801          * Some long-running pages (Install, Upgrade) will want to do this
1802          */
1803         protected function disableTimeLimit() {
1804                 wfSuppressWarnings();
1805                 set_time_limit( 0 );
1806                 wfRestoreWarnings();
1807         }
1808 }