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                 'envCheckJSON',
 141         );
 142
 143         /**
 144          * A list of environment preparation methods called by doEnvironmentPreps().
 145          *
 146          * @var array
 147          */
 148         protected $envPreps = array(
 149                 'envPrepServer',
 150                 'envPrepPath',
 151                 'envPrepExtension',
 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                 '_MemCachedServers' => '',
 222                 '_UpgradeKeySupplied' => false,
 223                 '_ExistingDBSettings' => false,
 224
 225                 // $wgLogo is probably wrong (bug 48084); set something that will work.
 226                 // Single quotes work fine here, as LocalSettingsGenerator outputs this unescaped.
 227                 'wgLogo' => '$wgStylePath/common/images/wiki.png',
 228         );
 229
 230         /**
 231          * The actual list of installation steps. This will be initialized by getInstallSteps()
 232          *
 233          * @var array
 234          */
 235         private $installSteps = array();
 236
 237         /**
 238          * Extra steps for installation, for things like DatabaseInstallers to modify
 239          *
 240          * @var array
 241          */
 242         protected $extraInstallSteps = array();
 243
 244         /**
 245          * Known object cache types and the functions used to test for their existence.
 246          *
 247          * @var array
 248          */
 249         protected $objectCaches = array(
 250                 'xcache' => 'xcache_get',
 251                 'apc' => 'apc_fetch',
 252                 'wincache' => 'wincache_ucache_get'
 253         );
 254
 255         /**
 256          * User rights profiles.
 257          *
 258          * @var array
 259          */
 260         public $rightsProfiles = array(
 261                 'wiki' => array(),
 262                 'no-anon' => array(
 263                         '*' => array( 'edit' => false )
 264                 ),
 265                 'fishbowl' => array(
 266                         '*' => array(
 267                                 'createaccount' => false,
 268                                 'edit' => false,
 269                         ),
 270                 ),
 271                 'private' => array(
 272                         '*' => array(
 273                                 'createaccount' => false,
 274                                 'edit' => false,
 275                                 'read' => false,
 276                         ),
 277                 ),
 278         );
 279
 280         /**
 281          * License types.
 282          *
 283          * @var array
 284          */
 285         public $licenses = array(
 286                 'cc-by' => array(
 287                         'url' => 'http://creativecommons.org/licenses/by/3.0/',
 288                         'icon' => '{$wgStylePath}/common/images/cc-by.png',
 289                 ),
 290                 'cc-by-sa' => array(
 291                         'url' => 'http://creativecommons.org/licenses/by-sa/3.0/',
 292                         'icon' => '{$wgStylePath}/common/images/cc-by-sa.png',
 293                 ),
 294                 'cc-by-nc-sa' => array(
 295                         'url' => 'http://creativecommons.org/licenses/by-nc-sa/3.0/',
 296                         'icon' => '{$wgStylePath}/common/images/cc-by-nc-sa.png',
 297                 ),
 298                 'cc-0' => array(
 299                         'url' => 'https://creativecommons.org/publicdomain/zero/1.0/',
 300                         'icon' => '{$wgStylePath}/common/images/cc-0.png',
 301                 ),
 302                 'pd' => array(
 303                         'url' => '',
 304                         'icon' => '{$wgStylePath}/common/images/public-domain.png',
 305                 ),
 306                 'gfdl' => array(
 307                         'url' => 'http://www.gnu.org/copyleft/fdl.html',
 308                         'icon' => '{$wgStylePath}/common/images/gnu-fdl.png',
 309                 ),
 310                 'none' => array(
 311                         'url' => '',
 312                         'icon' => '',
 313                         'text' => ''
 314                 ),
 315                 'cc-choose' => array(
 316                         // Details will be filled in by the selector.
 317                         'url' => '',
 318                         'icon' => '',
 319                         'text' => '',
 320                 ),
 321         );
 322
 323         /**
 324          * URL to mediawiki-announce subscription
 325          */
 326         protected $mediaWikiAnnounceUrl =
 327                 'https://lists.wikimedia.org/mailman/subscribe/mediawiki-announce';
 328
 329         /**
 330          * Supported language codes for Mailman
 331          */
 332         protected $mediaWikiAnnounceLanguages = array(
 333                 'ca', 'cs', 'da', 'de', 'en', 'es', 'et', 'eu', 'fi', 'fr', 'hr', 'hu',
 334                 'it', 'ja', 'ko', 'lt', 'nl', 'no', 'pl', 'pt', 'pt-br', 'ro', 'ru',
 335                 'sl', 'sr', 'sv', 'tr', 'uk'
 336         );
 337
 338         /**
 339          * UI interface for displaying a short message
 340          * The parameters are like parameters to wfMessage().
 341          * The messages will be in wikitext format, which will be converted to an
 342          * output format such as HTML or text before being sent to the user.
 343          * @param string $msg
 344          */
 345         abstract public function showMessage( $msg /*, ... */ );
 346
 347         /**
 348          * Same as showMessage(), but for displaying errors
 349          * @param string $msg
 350          */
 351         abstract public function showError( $msg /*, ... */ );
 352
 353         /**
 354          * Show a message to the installing user by using a Status object
 355          * @param Status $status
 356          */
 357         abstract public function showStatusMessage( Status $status );
 358
 359         /**
 360          * Constructor, always call this from child classes.
 361          */
 362         public function __construct() {
 363                 global $wgMessagesDirs, $wgUser;
 364
 365                 // Disable the i18n cache
 366                 Language::getLocalisationCache()->disableBackend();
 367                 // Disable LoadBalancer and wfGetDB etc.
 368                 LBFactory::disableBackend();
 369
 370                 // Disable object cache (otherwise CACHE_ANYTHING will try CACHE_DB and
 371                 // SqlBagOStuff will then throw since we just disabled wfGetDB)
 372                 $GLOBALS['wgMemc'] = new EmptyBagOStuff;
 373                 ObjectCache::clear();
 374                 $emptyCache = array( 'class' => 'EmptyBagOStuff' );
 375                 $GLOBALS['wgObjectCaches'] = array(
 376                         CACHE_NONE => $emptyCache,
 377                         CACHE_DB => $emptyCache,
 378                         CACHE_ANYTHING => $emptyCache,
 379                         CACHE_MEMCACHED => $emptyCache,
 380                 );
 381
 382                 // Load the installer's i18n.
 383                 $wgMessagesDirs['MediawikiInstaller'] = __DIR__ . '/i18n';
 384
 385                 // Having a user with id = 0 safeguards us from DB access via User::loadOptions().
 386                 $wgUser = User::newFromId( 0 );
 387
 388                 $this->settings = $this->internalDefaults;
 389
 390                 foreach ( $this->defaultVarNames as $var ) {
 391                         $this->settings[$var] = $GLOBALS[$var];
 392                 }
 393
 394                 $this->doEnvironmentPreps();
 395
 396                 $this->compiledDBs = array();
 397                 foreach ( self::getDBTypes() as $type ) {
 398                         $installer = $this->getDBInstaller( $type );
 399
 400                         if ( !$installer->isCompiled() ) {
 401                                 continue;
 402                         }
 403                         $this->compiledDBs[] = $type;
 404                 }
 405
 406                 $this->parserTitle = Title::newFromText( 'Installer' );
 407                 $this->parserOptions = new ParserOptions; // language will be wrong :(
 408                 $this->parserOptions->setEditSection( false );
 409         }
 410
 411         /**
 412          * Get a list of known DB types.
 413          *
 414          * @return array
 415          */
 416         public static function getDBTypes() {
 417                 return self::$dbTypes;
 418         }
 419
 420         /**
 421          * Do initial checks of the PHP environment. Set variables according to
 422          * the observed environment.
 423          *
 424          * It's possible that this may be called under the CLI SAPI, not the SAPI
 425          * that the wiki will primarily run under. In that case, the subclass should
 426          * initialise variables such as wgScriptPath, before calling this function.
 427          *
 428          * Under the web subclass, it can already be assumed that PHP 5+ is in use
 429          * and that sessions are working.
 430          *
 431          * @return Status
 432          */
 433         public function doEnvironmentChecks() {
 434                 // Php version has already been checked by entry scripts
 435                 // Show message here for information purposes
 436                 $this->showMessage( 'config-env-php', PHP_VERSION );
 437
 438                 $good = true;
 439                 // Must go here because an old version of PCRE can prevent other checks from completing
 440                 list( $pcreVersion ) = explode( ' ', PCRE_VERSION, 2 );
 441                 if ( version_compare( $pcreVersion, self::MINIMUM_PCRE_VERSION, '<' ) ) {
 442                         $this->showError( 'config-pcre-old', self::MINIMUM_PCRE_VERSION, $pcreVersion );
 443                         $good = false;
 444                 } else {
 445                         foreach ( $this->envChecks as $check ) {
 446                                 $status = $this->$check();
 447                                 if ( $status === false ) {
 448                                         $good = false;
 449                                 }
 450                         }
 451                 }
 452
 453                 $this->setVar( '_Environment', $good );
 454
 455                 return $good ? Status::newGood() : Status::newFatal( 'config-env-bad' );
 456         }
 457
 458         public function doEnvironmentPreps() {
 459                 foreach ( $this->envPreps as $prep ) {
 460                         $this->$prep();
 461                 }
 462         }
 463
 464         /**
 465          * Set a MW configuration variable, or internal installer configuration variable.
 466          *
 467          * @param string $name
 468          * @param mixed $value
 469          */
 470         public function setVar( $name, $value ) {
 471                 $this->settings[$name] = $value;
 472         }
 473
 474         /**
 475          * Get an MW configuration variable, or internal installer configuration variable.
 476          * The defaults come from $GLOBALS (ultimately DefaultSettings.php).
 477          * Installer variables are typically prefixed by an underscore.
 478          *
 479          * @param string $name
 480          * @param mixed $default
 481          *
 482          * @return mixed
 483          */
 484         public function getVar( $name, $default = null ) {
 485                 if ( !isset( $this->settings[$name] ) ) {
 486                         return $default;
 487                 } else {
 488                         return $this->settings[$name];
 489                 }
 490         }
 491
 492         /**
 493          * Get a list of DBs supported by current PHP setup
 494          *
 495          * @return array
 496          */
 497         public function getCompiledDBs() {
 498                 return $this->compiledDBs;
 499         }
 500
 501         /**
 502          * Get an instance of DatabaseInstaller for the specified DB type.
 503          *
 504          * @param mixed $type DB installer for which is needed, false to use default.
 505          *
 506          * @return DatabaseInstaller
 507          */
 508         public function getDBInstaller( $type = false ) {
 509                 if ( !$type ) {
 510                         $type = $this->getVar( 'wgDBtype' );
 511                 }
 512
 513                 $type = strtolower( $type );
 514
 515                 if ( !isset( $this->dbInstallers[$type] ) ) {
 516                         $class = ucfirst( $type ) . 'Installer';
 517                         $this->dbInstallers[$type] = new $class( $this );
 518                 }
 519
 520                 return $this->dbInstallers[$type];
 521         }
 522
 523         /**
 524          * Determine if LocalSettings.php exists. If it does, return its variables.
 525          *
 526          * @return array
 527          */
 528         public static function getExistingLocalSettings() {
 529                 global $IP;
 530
 531                 wfSuppressWarnings();
 532                 $_lsExists = file_exists( "$IP/LocalSettings.php" );
 533                 wfRestoreWarnings();
 534
 535                 if ( !$_lsExists ) {
 536                         return false;
 537                 }
 538                 unset( $_lsExists );
 539
 540                 require "$IP/includes/DefaultSettings.php";
 541                 require "$IP/LocalSettings.php";
 542
 543                 return get_defined_vars();
 544         }
 545
 546         /**
 547          * Get a fake password for sending back to the user in HTML.
 548          * This is a security mechanism to avoid compromise of the password in the
 549          * event of session ID compromise.
 550          *
 551          * @param string $realPassword
 552          *
 553          * @return string
 554          */
 555         public function getFakePassword( $realPassword ) {
 556                 return str_repeat( '*', strlen( $realPassword ) );
 557         }
 558
 559         /**
 560          * Set a variable which stores a password, except if the new value is a
 561          * fake password in which case leave it as it is.
 562          *
 563          * @param string $name
 564          * @param mixed $value
 565          */
 566         public function setPassword( $name, $value ) {
 567                 if ( !preg_match( '/^\*+$/', $value ) ) {
 568                         $this->setVar( $name, $value );
 569                 }
 570         }
 571
 572         /**
 573          * On POSIX systems return the primary group of the webserver we're running under.
 574          * On other systems just returns null.
 575          *
 576          * This is used to advice the user that he should chgrp his mw-config/data/images directory as the
 577          * webserver user before he can install.
 578          *
 579          * Public because SqliteInstaller needs it, and doesn't subclass Installer.
 580          *
 581          * @return mixed
 582          */
 583         public static function maybeGetWebserverPrimaryGroup() {
 584                 if ( !function_exists( 'posix_getegid' ) || !function_exists( 'posix_getpwuid' ) ) {
 585                         # I don't know this, this isn't UNIX.
 586                         return null;
 587                 }
 588
 589                 # posix_getegid() *not* getmygid() because we want the group of the webserver,
 590                 # not whoever owns the current script.
 591                 $gid = posix_getegid();
 592                 $getpwuid = posix_getpwuid( $gid );
 593                 $group = $getpwuid['name'];
 594
 595                 return $group;
 596         }
 597
 598         /**
 599          * Convert wikitext $text to HTML.
 600          *
 601          * This is potentially error prone since many parser features require a complete
 602          * installed MW database. The solution is to just not use those features when you
 603          * write your messages. This appears to work well enough. Basic formatting and
 604          * external links work just fine.
 605          *
 606          * But in case a translator decides to throw in a "#ifexist" or internal link or
 607          * whatever, this function is guarded to catch the attempted DB access and to present
 608          * some fallback text.
 609          *
 610          * @param string $text
 611          * @param bool $lineStart
 612          * @return string
 613          */
 614         public function parse( $text, $lineStart = false ) {
 615                 global $wgParser;
 616
 617                 try {
 618                         $out = $wgParser->parse( $text, $this->parserTitle, $this->parserOptions, $lineStart );
 619                         $html = $out->getText();
 620                 } catch ( DBAccessError $e ) {
 621                         $html = '<!--DB access attempted during parse-->  ' . htmlspecialchars( $text );
 622
 623                         if ( !empty( $this->debug ) ) {
 624                                 $html .= "<!--\n" . $e->getTraceAsString() . "\n-->";
 625                         }
 626                 }
 627
 628                 return $html;
 629         }
 630
 631         /**
 632          * @return ParserOptions
 633          */
 634         public function getParserOptions() {
 635                 return $this->parserOptions;
 636         }
 637
 638         public function disableLinkPopups() {
 639                 $this->parserOptions->setExternalLinkTarget( false );
 640         }
 641
 642         public function restoreLinkPopups() {
 643                 global $wgExternalLinkTarget;
 644                 $this->parserOptions->setExternalLinkTarget( $wgExternalLinkTarget );
 645         }
 646
 647         /**
 648          * Install step which adds a row to the site_stats table with appropriate
 649          * initial values.
 650          *
 651          * @param DatabaseInstaller $installer
 652          *
 653          * @return Status
 654          */
 655         public function populateSiteStats( DatabaseInstaller $installer ) {
 656                 $status = $installer->getConnection();
 657                 if ( !$status->isOK() ) {
 658                         return $status;
 659                 }
 660                 $status->value->insert(
 661                         'site_stats',
 662                         array(
 663                                 'ss_row_id' => 1,
 664                                 'ss_total_views' => 0,
 665                                 'ss_total_edits' => 0,
 666                                 'ss_good_articles' => 0,
 667                                 'ss_total_pages' => 0,
 668                                 'ss_users' => 0,
 669                                 'ss_images' => 0
 670                         ),
 671                         __METHOD__, 'IGNORE'
 672                 );
 673
 674                 return Status::newGood();
 675         }
 676
 677         /**
 678          * Exports all wg* variables stored by the installer into global scope.
 679          */
 680         public function exportVars() {
 681                 foreach ( $this->settings as $name => $value ) {
 682                         if ( substr( $name, 0, 2 ) == 'wg' ) {
 683                                 $GLOBALS[$name] = $value;
 684                         }
 685                 }
 686         }
 687
 688         /**
 689          * Environment check for DB types.
 690          * @return bool
 691          */
 692         protected function envCheckDB() {
 693                 global $wgLang;
 694
 695                 $allNames = array();
 696
 697                 // Messages: config-type-mysql, config-type-postgres, config-type-oracle,
 698                 // config-type-sqlite
 699                 foreach ( self::getDBTypes() as $name ) {
 700                         $allNames[] = wfMessage( "config-type-$name" )->text();
 701                 }
 702
 703                 $databases = $this->getCompiledDBs();
 704
 705                 $databases = array_flip( $databases );
 706                 foreach ( array_keys( $databases ) as $db ) {
 707                         $installer = $this->getDBInstaller( $db );
 708                         $status = $installer->checkPrerequisites();
 709                         if ( !$status->isGood() ) {
 710                                 $this->showStatusMessage( $status );
 711                         }
 712                         if ( !$status->isOK() ) {
 713                                 unset( $databases[$db] );
 714                         }
 715                 }
 716                 $databases = array_flip( $databases );
 717                 if ( !$databases ) {
 718                         $this->showError( 'config-no-db', $wgLang->commaList( $allNames ) );
 719
 720                         // @todo FIXME: This only works for the web installer!
 721                         return false;
 722                 }
 723
 724                 return true;
 725         }
 726
 727         /**
 728          * Environment check for register_globals.
 729          * Prevent installation if enabled
 730          */
 731         protected function envCheckRegisterGlobals() {
 732                 if ( wfIniGetBool( 'register_globals' ) ) {
 733                         $this->showMessage( 'config-register-globals-error' );
 734                         return false;
 735                 }
 736
 737                 return true;
 738         }
 739
 740         /**
 741          * Some versions of libxml+PHP break < and > encoding horribly
 742          * @return bool
 743          */
 744         protected function envCheckBrokenXML() {
 745                 $test = new PhpXmlBugTester();
 746                 if ( !$test->ok ) {
 747                         $this->showError( 'config-brokenlibxml' );
 748
 749                         return false;
 750                 }
 751
 752                 return true;
 753         }
 754
 755         /**
 756          * Environment check for magic_quotes_runtime.
 757          * @return bool
 758          */
 759         protected function envCheckMagicQuotes() {
 760                 if ( wfIniGetBool( "magic_quotes_runtime" ) ) {
 761                         $this->showError( 'config-magic-quotes-runtime' );
 762
 763                         return false;
 764                 }
 765
 766                 return true;
 767         }
 768
 769         /**
 770          * Environment check for magic_quotes_sybase.
 771          * @return bool
 772          */
 773         protected function envCheckMagicSybase() {
 774                 if ( wfIniGetBool( 'magic_quotes_sybase' ) ) {
 775                         $this->showError( 'config-magic-quotes-sybase' );
 776
 777                         return false;
 778                 }
 779
 780                 return true;
 781         }
 782
 783         /**
 784          * Environment check for mbstring.func_overload.
 785          * @return bool
 786          */
 787         protected function envCheckMbstring() {
 788                 if ( wfIniGetBool( 'mbstring.func_overload' ) ) {
 789                         $this->showError( 'config-mbstring' );
 790
 791                         return false;
 792                 }
 793
 794                 return true;
 795         }
 796
 797         /**
 798          * Environment check for safe_mode.
 799          * @return bool
 800          */
 801         protected function envCheckSafeMode() {
 802                 if ( wfIniGetBool( 'safe_mode' ) ) {
 803                         $this->setVar( '_SafeMode', true );
 804                         $this->showMessage( 'config-safe-mode' );
 805                 }
 806
 807                 return true;
 808         }
 809
 810         /**
 811          * Environment check for the XML module.
 812          * @return bool
 813          */
 814         protected function envCheckXML() {
 815                 if ( !function_exists( "utf8_encode" ) ) {
 816                         $this->showError( 'config-xml-bad' );
 817
 818                         return false;
 819                 }
 820
 821                 return true;
 822         }
 823
 824         /**
 825          * Environment check for the PCRE module.
 826          *
 827          * @note If this check were to fail, the parser would
 828          *   probably throw an exception before the result
 829          *   of this check is shown to the user.
 830          * @return bool
 831          */
 832         protected function envCheckPCRE() {
 833                 wfSuppressWarnings();
 834                 $regexd = preg_replace( '/[\x{0430}-\x{04FF}]/iu', '', '-АБВГД-' );
 835                 // Need to check for \p support too, as PCRE can be compiled
 836                 // with utf8 support, but not unicode property support.
 837                 // check that \p{Zs} (space separators) matches
 838                 // U+3000 (Ideographic space)
 839                 $regexprop = preg_replace( '/\p{Zs}/u', '', "-\xE3\x80\x80-" );
 840                 wfRestoreWarnings();
 841                 if ( $regexd != '--' || $regexprop != '--' ) {
 842                         $this->showError( 'config-pcre-no-utf8' );
 843
 844                         return false;
 845                 }
 846
 847                 return true;
 848         }
 849
 850         /**
 851          * Environment check for available memory.
 852          * @return bool
 853          */
 854         protected function envCheckMemory() {
 855                 $limit = ini_get( 'memory_limit' );
 856
 857                 if ( !$limit || $limit == -1 ) {
 858                         return true;
 859                 }
 860
 861                 $n = wfShorthandToInteger( $limit );
 862
 863                 if ( $n < $this->minMemorySize * 1024 * 1024 ) {
 864                         $newLimit = "{$this->minMemorySize}M";
 865
 866                         if ( ini_set( "memory_limit", $newLimit ) === false ) {
 867                                 $this->showMessage( 'config-memory-bad', $limit );
 868                         } else {
 869                                 $this->showMessage( 'config-memory-raised', $limit, $newLimit );
 870                                 $this->setVar( '_RaiseMemory', true );
 871                         }
 872                 }
 873
 874                 return true;
 875         }
 876
 877         /**
 878          * Environment check for compiled object cache types.
 879          */
 880         protected function envCheckCache() {
 881                 $caches = array();
 882                 foreach ( $this->objectCaches as $name => $function ) {
 883                         if ( function_exists( $function ) ) {
 884                                 if ( $name == 'xcache' && !wfIniGetBool( 'xcache.var_size' ) ) {
 885                                         continue;
 886                                 }
 887                                 $caches[$name] = true;
 888                         }
 889                 }
 890
 891                 if ( !$caches ) {
 892                         $this->showMessage( 'config-no-cache' );
 893                 }
 894
 895                 $this->setVar( '_Caches', $caches );
 896         }
 897
 898         /**
 899          * Scare user to death if they have mod_security
 900          * @return bool
 901          */
 902         protected function envCheckModSecurity() {
 903                 if ( self::apacheModulePresent( 'mod_security' ) ) {
 904                         $this->showMessage( 'config-mod-security' );
 905                 }
 906
 907                 return true;
 908         }
 909
 910         /**
 911          * Search for GNU diff3.
 912          * @return bool
 913          */
 914         protected function envCheckDiff3() {
 915                 $names = array( "gdiff3", "diff3", "diff3.exe" );
 916                 $versionInfo = array( '$1 --version 2>&1', 'GNU diffutils' );
 917
 918                 $diff3 = self::locateExecutableInDefaultPaths( $names, $versionInfo );
 919
 920                 if ( $diff3 ) {
 921                         $this->setVar( 'wgDiff3', $diff3 );
 922                 } else {
 923                         $this->setVar( 'wgDiff3', false );
 924                         $this->showMessage( 'config-diff3-bad' );
 925                 }
 926
 927                 return true;
 928         }
 929
 930         /**
 931          * Environment check for ImageMagick and GD.
 932          * @return bool
 933          */
 934         protected function envCheckGraphics() {
 935                 $names = array( wfIsWindows() ? 'convert.exe' : 'convert' );
 936                 $versionInfo = array( '$1 -version', 'ImageMagick' );
 937                 $convert = self::locateExecutableInDefaultPaths( $names, $versionInfo );
 938
 939                 $this->setVar( 'wgImageMagickConvertCommand', '' );
 940                 if ( $convert ) {
 941                         $this->setVar( 'wgImageMagickConvertCommand', $convert );
 942                         $this->showMessage( 'config-imagemagick', $convert );
 943
 944                         return true;
 945                 } elseif ( function_exists( 'imagejpeg' ) ) {
 946                         $this->showMessage( 'config-gd' );
 947                 } else {
 948                         $this->showMessage( 'config-no-scaling' );
 949                 }
 950
 951                 return true;
 952         }
 953
 954         /**
 955          * Search for git.
 956          *
 957          * @since 1.22
 958          * @return bool
 959          */
 960         protected function envCheckGit() {
 961                 $names = array( wfIsWindows() ? 'git.exe' : 'git' );
 962                 $versionInfo = array( '$1 --version', 'git version' );
 963
 964                 $git = self::locateExecutableInDefaultPaths( $names, $versionInfo );
 965
 966                 if ( $git ) {
 967                         $this->setVar( 'wgGitBin', $git );
 968                         $this->showMessage( 'config-git', $git );
 969                 } else {
 970                         $this->setVar( 'wgGitBin', false );
 971                         $this->showMessage( 'config-git-bad' );
 972                 }
 973
 974                 return true;
 975         }
 976
 977         /**
 978          * Environment check to inform user which server we've assumed.
 979          *
 980          * @return bool
 981          */
 982         protected function envCheckServer() {
 983                 $server = $this->envGetDefaultServer();
 984                 if ( $server !== null ) {
 985                         $this->showMessage( 'config-using-server', $server );
 986                 }
 987                 return true;
 988         }
 989
 990         /**
 991          * Environment check to inform user which paths we've assumed.
 992          *
 993          * @return bool
 994          */
 995         protected function envCheckPath() {
 996                 $this->showMessage(
 997                         'config-using-uri',
 998                         $this->getVar( 'wgServer' ),
 999                         $this->getVar( 'wgScriptPath' )
1000                 );
1001                 return true;
1002         }
1003
1004         /**
1005          * Environment check for preferred locale in shell
1006          * @return bool
1007          */
1008         protected function envCheckShellLocale() {
1009                 $os = php_uname( 's' );
1010                 $supported = array( 'Linux', 'SunOS', 'HP-UX', 'Darwin' ); # Tested these
1011
1012                 if ( !in_array( $os, $supported ) ) {
1013                         return true;
1014                 }
1015
1016                 # Get a list of available locales.
1017                 $ret = false;
1018                 $lines = wfShellExec( '/usr/bin/locale -a', $ret );
1019
1020                 if ( $ret ) {
1021                         return true;
1022                 }
1023
1024                 $lines = array_map( 'trim', explode( "\n", $lines ) );
1025                 $candidatesByLocale = array();
1026                 $candidatesByLang = array();
1027
1028                 foreach ( $lines as $line ) {
1029                         if ( $line === '' ) {
1030                                 continue;
1031                         }
1032
1033                         if ( !preg_match( '/^([a-zA-Z]+)(_[a-zA-Z]+|)\.(utf8|UTF-8)(@[a-zA-Z_]*|)$/i', $line, $m ) ) {
1034                                 continue;
1035                         }
1036
1037                         list( , $lang, , , ) = $m;
1038
1039                         $candidatesByLocale[$m[0]] = $m;
1040                         $candidatesByLang[$lang][] = $m;
1041                 }
1042
1043                 # Try the current value of LANG.
1044                 if ( isset( $candidatesByLocale[getenv( 'LANG' )] ) ) {
1045                         $this->setVar( 'wgShellLocale', getenv( 'LANG' ) );
1046
1047                         return true;
1048                 }
1049
1050                 # Try the most common ones.
1051                 $commonLocales = array( 'en_US.UTF-8', 'en_US.utf8', 'de_DE.UTF-8', 'de_DE.utf8' );
1052                 foreach ( $commonLocales as $commonLocale ) {
1053                         if ( isset( $candidatesByLocale[$commonLocale] ) ) {
1054                                 $this->setVar( 'wgShellLocale', $commonLocale );
1055
1056                                 return true;
1057                         }
1058                 }
1059
1060                 # Is there an available locale in the Wiki's language?
1061                 $wikiLang = $this->getVar( 'wgLanguageCode' );
1062
1063                 if ( isset( $candidatesByLang[$wikiLang] ) ) {
1064                         $m = reset( $candidatesByLang[$wikiLang] );
1065                         $this->setVar( 'wgShellLocale', $m[0] );
1066
1067                         return true;
1068                 }
1069
1070                 # Are there any at all?
1071                 if ( count( $candidatesByLocale ) ) {
1072                         $m = reset( $candidatesByLocale );
1073                         $this->setVar( 'wgShellLocale', $m[0] );
1074
1075                         return true;
1076                 }
1077
1078                 # Give up.
1079                 return true;
1080         }
1081
1082         /**
1083          * Environment check for the permissions of the uploads directory
1084          * @return bool
1085          */
1086         protected function envCheckUploadsDirectory() {
1087                 global $IP;
1088
1089                 $dir = $IP . '/images/';
1090                 $url = $this->getVar( 'wgServer' ) . $this->getVar( 'wgScriptPath' ) . '/images/';
1091                 $safe = !$this->dirIsExecutable( $dir, $url );
1092
1093                 if ( !$safe ) {
1094                         $this->showMessage( 'config-uploads-not-safe', $dir );
1095                 }
1096
1097                 return true;
1098         }
1099
1100         /**
1101          * Checks if suhosin.get.max_value_length is set, and if so generate
1102          * a warning because it decreases ResourceLoader performance.
1103          * @return bool
1104          */
1105         protected function envCheckSuhosinMaxValueLength() {
1106                 $maxValueLength = ini_get( 'suhosin.get.max_value_length' );
1107                 if ( $maxValueLength > 0 && $maxValueLength < 1024 ) {
1108                         // Only warn if the value is below the sane 1024
1109                         $this->showMessage( 'config-suhosin-max-value-length', $maxValueLength );
1110                 }
1111
1112                 return true;
1113         }
1114
1115         /**
1116          * Convert a hex string representing a Unicode code point to that code point.
1117          * @param string $c
1118          * @return string
1119          */
1120         protected function unicodeChar( $c ) {
1121                 $c = hexdec( $c );
1122                 if ( $c <= 0x7F ) {
1123                         return chr( $c );
1124                 } elseif ( $c <= 0x7FF ) {
1125                         return chr( 0xC0 | $c >> 6 ) . chr( 0x80 | $c & 0x3F );
1126                 } elseif ( $c <= 0xFFFF ) {
1127                         return chr( 0xE0 | $c >> 12 ) . chr( 0x80 | $c >> 6 & 0x3F )
1128                         . chr( 0x80 | $c & 0x3F );
1129                 } elseif ( $c <= 0x10FFFF ) {
1130                         return chr( 0xF0 | $c >> 18 ) . chr( 0x80 | $c >> 12 & 0x3F )
1131                         . chr( 0x80 | $c >> 6 & 0x3F )
1132                         . chr( 0x80 | $c & 0x3F );
1133                 } else {
1134                         return false;
1135                 }
1136         }
1137
1138         /**
1139          * Check the libicu version
1140          */
1141         protected function envCheckLibicu() {
1142                 $utf8 = function_exists( 'utf8_normalize' );
1143                 $intl = function_exists( 'normalizer_normalize' );
1144
1145                 /**
1146                  * This needs to be updated something that the latest libicu
1147                  * will properly normalize.  This normalization was found at
1148                  * http://www.unicode.org/versions/Unicode5.2.0/#Character_Additions
1149                  * Note that we use the hex representation to create the code
1150                  * points in order to avoid any Unicode-destroying during transit.
1151                  */
1152                 $not_normal_c = $this->unicodeChar( "FA6C" );
1153                 $normal_c = $this->unicodeChar( "242EE" );
1154
1155                 $useNormalizer = 'php';
1156                 $needsUpdate = false;
1157
1158                 /**
1159                  * We're going to prefer the pecl extension here unless
1160                  * utf8_normalize is more up to date.
1161                  */
1162                 if ( $utf8 ) {
1163                         $useNormalizer = 'utf8';
1164                         $utf8 = utf8_normalize( $not_normal_c, UtfNormal::UNORM_NFC );
1165                         if ( $utf8 !== $normal_c ) {
1166                                 $needsUpdate = true;
1167                         }
1168                 }
1169                 if ( $intl ) {
1170                         $useNormalizer = 'intl';
1171                         $intl = normalizer_normalize( $not_normal_c, Normalizer::FORM_C );
1172                         if ( $intl !== $normal_c ) {
1173                                 $needsUpdate = true;
1174                         }
1175                 }
1176
1177                 // Uses messages 'config-unicode-using-php', 'config-unicode-using-utf8',
1178                 // 'config-unicode-using-intl'
1179                 if ( $useNormalizer === 'php' ) {
1180                         $this->showMessage( 'config-unicode-pure-php-warning' );
1181                 } else {
1182                         $this->showMessage( 'config-unicode-using-' . $useNormalizer );
1183                         if ( $needsUpdate ) {
1184                                 $this->showMessage( 'config-unicode-update-warning' );
1185                         }
1186                 }
1187         }
1188
1189         /**
1190          * @return bool
1191          */
1192         protected function envCheckCtype() {
1193                 if ( !function_exists( 'ctype_digit' ) ) {
1194                         $this->showError( 'config-ctype' );
1195
1196                         return false;
1197                 }
1198
1199                 return true;
1200         }
1201
1202         /**
1203          * @return bool
1204          */
1205         protected function envCheckJSON() {
1206                 if ( !function_exists( 'json_decode' ) ) {
1207                         $this->showError( 'config-json' );
1208
1209                         return false;
1210                 }
1211
1212                 return true;
1213         }
1214
1215         /**
1216          * Environment prep for the server hostname.
1217          */
1218         protected function envPrepServer() {
1219                 $server = $this->envGetDefaultServer();
1220                 if ( $server !== null ) {
1221                         $this->setVar( 'wgServer', $server );
1222                 }
1223         }
1224
1225         /**
1226          * Helper function to be called from envPrepServer()
1227          * @return string
1228          */
1229         abstract protected function envGetDefaultServer();
1230
1231         /**
1232          * Environment prep for setting the preferred PHP file extension.
1233          */
1234         protected function envPrepExtension() {
1235                 // @todo FIXME: Detect this properly
1236                 if ( defined( 'MW_INSTALL_PHP5_EXT' ) ) {
1237                         $ext = '.php5';
1238                 } else {
1239                         $ext = '.php';
1240                 }
1241                 $this->setVar( 'wgScriptExtension', $ext );
1242         }
1243
1244         /**
1245          * Environment prep for setting $IP and $wgScriptPath.
1246          */
1247         protected function envPrepPath() {
1248                 global $IP;
1249                 $IP = dirname( dirname( __DIR__ ) );
1250                 $this->setVar( 'IP', $IP );
1251         }
1252
1253         /**
1254          * Get an array of likely places we can find executables. Check a bunch
1255          * of known Unix-like defaults, as well as the PATH environment variable
1256          * (which should maybe make it work for Windows?)
1257          *
1258          * @return array
1259          */
1260         protected static function getPossibleBinPaths() {
1261                 return array_merge(
1262                         array( '/usr/bin', '/usr/local/bin', '/opt/csw/bin',
1263                                 '/usr/gnu/bin', '/usr/sfw/bin', '/sw/bin', '/opt/local/bin' ),
1264                         explode( PATH_SEPARATOR, getenv( 'PATH' ) )
1265                 );
1266         }
1267
1268         /**
1269          * Search a path for any of the given executable names. Returns the
1270          * executable name if found. Also checks the version string returned
1271          * by each executable.
1272          *
1273          * Used only by environment checks.
1274          *
1275          * @param string $path path to search
1276          * @param array $names of executable names
1277          * @param array|bool $versionInfo False or array with two members:
1278          *   0 => Command to run for version check, with $1 for the full executable name
1279          *   1 => String to compare the output with
1280          *
1281          * If $versionInfo is not false, only executables with a version
1282          * matching $versionInfo[1] will be returned.
1283          * @return bool|string
1284          */
1285         public static function locateExecutable( $path, $names, $versionInfo = false ) {
1286                 if ( !is_array( $names ) ) {
1287                         $names = array( $names );
1288                 }
1289
1290                 foreach ( $names as $name ) {
1291                         $command = $path . DIRECTORY_SEPARATOR . $name;
1292
1293                         wfSuppressWarnings();
1294                         $file_exists = file_exists( $command );
1295                         wfRestoreWarnings();
1296
1297                         if ( $file_exists ) {
1298                                 if ( !$versionInfo ) {
1299                                         return $command;
1300                                 }
1301
1302                                 $file = str_replace( '$1', wfEscapeShellArg( $command ), $versionInfo[0] );
1303                                 if ( strstr( wfShellExec( $file ), $versionInfo[1] ) !== false ) {
1304                                         return $command;
1305                                 }
1306                         }
1307                 }
1308
1309                 return false;
1310         }
1311
1312         /**
1313          * Same as locateExecutable(), but checks in getPossibleBinPaths() by default
1314          * @see locateExecutable()
1315          * @param array $names Array of possible names.
1316          * @param array|bool $versionInfo Default: false or array with two members:
1317          *   0 => Command to run for version check, with $1 for the full executable name
1318          *   1 => String to compare the output with
1319          *
1320          * If $versionInfo is not false, only executables with a version
1321          * matching $versionInfo[1] will be returned.
1322          * @return bool|string
1323          */
1324         public static function locateExecutableInDefaultPaths( $names, $versionInfo = false ) {
1325                 foreach ( self::getPossibleBinPaths() as $path ) {
1326                         $exe = self::locateExecutable( $path, $names, $versionInfo );
1327                         if ( $exe !== false ) {
1328                                 return $exe;
1329                         }
1330                 }
1331
1332                 return false;
1333         }
1334
1335         /**
1336          * Checks if scripts located in the given directory can be executed via the given URL.
1337          *
1338          * Used only by environment checks.
1339          * @param string $dir
1340          * @param string $url
1341          * @return bool|int|string
1342          */
1343         public function dirIsExecutable( $dir, $url ) {
1344                 $scriptTypes = array(
1345                         'php' => array(
1346                                 "<?php echo 'ex' . 'ec';",
1347                                 "#!/var/env php5\n<?php echo 'ex' . 'ec';",
1348                         ),
1349                 );
1350
1351                 // it would be good to check other popular languages here, but it'll be slow.
1352
1353                 wfSuppressWarnings();
1354
1355                 foreach ( $scriptTypes as $ext => $contents ) {
1356                         foreach ( $contents as $source ) {
1357                                 $file = 'exectest.' . $ext;
1358
1359                                 if ( !file_put_contents( $dir . $file, $source ) ) {
1360                                         break;
1361                                 }
1362
1363                                 try {
1364                                         $text = Http::get( $url . $file, array( 'timeout' => 3 ) );
1365                                 } catch ( MWException $e ) {
1366                                         // Http::get throws with allow_url_fopen = false and no curl extension.
1367                                         $text = null;
1368                                 }
1369                                 unlink( $dir . $file );
1370
1371                                 if ( $text == 'exec' ) {
1372                                         wfRestoreWarnings();
1373
1374                                         return $ext;
1375                                 }
1376                         }
1377                 }
1378
1379                 wfRestoreWarnings();
1380
1381                 return false;
1382         }
1383
1384         /**
1385          * Checks for presence of an Apache module. Works only if PHP is running as an Apache module, too.
1386          *
1387          * @param string $moduleName Name of module to check.
1388          * @return bool
1389          */
1390         public static function apacheModulePresent( $moduleName ) {
1391                 if ( function_exists( 'apache_get_modules' ) && in_array( $moduleName, apache_get_modules() ) ) {
1392                         return true;
1393                 }
1394                 // try it the hard way
1395                 ob_start();
1396                 phpinfo( INFO_MODULES );
1397                 $info = ob_get_clean();
1398
1399                 return strpos( $info, $moduleName ) !== false;
1400         }
1401
1402         /**
1403          * ParserOptions are constructed before we determined the language, so fix it
1404          *
1405          * @param Language $lang
1406          */
1407         public function setParserLanguage( $lang ) {
1408                 $this->parserOptions->setTargetLanguage( $lang );
1409                 $this->parserOptions->setUserLang( $lang );
1410         }
1411
1412         /**
1413          * Overridden by WebInstaller to provide lastPage parameters.
1414          * @param string $page
1415          * @return string
1416          */
1417         protected function getDocUrl( $page ) {
1418                 return "{$_SERVER['PHP_SELF']}?page=" . urlencode( $page );
1419         }
1420
1421         /**
1422          * Finds extensions that follow the format /extensions/Name/Name.php,
1423          * and returns an array containing the value for 'Name' for each found extension.
1424          *
1425          * @return array
1426          */
1427         public function findExtensions() {
1428                 if ( $this->getVar( 'IP' ) === null ) {
1429                         return array();
1430                 }
1431
1432                 $extDir = $this->getVar( 'IP' ) . '/extensions';
1433                 if ( !is_readable( $extDir ) || !is_dir( $extDir ) ) {
1434                         return array();
1435                 }
1436
1437                 $dh = opendir( $extDir );
1438                 $exts = array();
1439                 while ( ( $file = readdir( $dh ) ) !== false ) {
1440                         if ( !is_dir( "$extDir/$file" ) ) {
1441                                 continue;
1442                         }
1443                         if ( file_exists( "$extDir/$file/$file.php" ) ) {
1444                                 $exts[] = $file;
1445                         }
1446                 }
1447                 closedir( $dh );
1448                 natcasesort( $exts );
1449
1450                 return $exts;
1451         }
1452
1453         /**
1454          * Installs the auto-detected extensions.
1455          *
1456          * @return Status
1457          */
1458         protected function includeExtensions() {
1459                 global $IP;
1460                 $exts = $this->getVar( '_Extensions' );
1461                 $IP = $this->getVar( 'IP' );
1462
1463                 /**
1464                  * We need to include DefaultSettings before including extensions to avoid
1465                  * warnings about unset variables. However, the only thing we really
1466                  * want here is $wgHooks['LoadExtensionSchemaUpdates']. This won't work
1467                  * if the extension has hidden hook registration in $wgExtensionFunctions,
1468                  * but we're not opening that can of worms
1469                  * @see https://bugzilla.wikimedia.org/show_bug.cgi?id=26857
1470                  */
1471                 global $wgAutoloadClasses;
1472                 $wgAutoloadClasses = array();
1473
1474                 require "$IP/includes/DefaultSettings.php";
1475
1476                 foreach ( $exts as $e ) {
1477                         require_once "$IP/extensions/$e/$e.php";
1478                 }
1479
1480                 $hooksWeWant = isset( $wgHooks['LoadExtensionSchemaUpdates'] ) ?
1481                         $wgHooks['LoadExtensionSchemaUpdates'] : array();
1482
1483                 // Unset everyone else's hooks. Lord knows what someone might be doing
1484                 // in ParserFirstCallInit (see bug 27171)
1485                 $GLOBALS['wgHooks'] = array( 'LoadExtensionSchemaUpdates' => $hooksWeWant );
1486
1487                 return Status::newGood();
1488         }
1489
1490         /**
1491          * Get an array of install steps. Should always be in the format of
1492          * array(
1493          *   'name'     => 'someuniquename',
1494          *   'callback' => array( $obj, 'method' ),
1495          * )
1496          * There must be a config-install-$name message defined per step, which will
1497          * be shown on install.
1498          *
1499          * @param DatabaseInstaller $installer DatabaseInstaller so we can make callbacks
1500          * @return array
1501          */
1502         protected function getInstallSteps( DatabaseInstaller $installer ) {
1503                 $coreInstallSteps = array(
1504                         array( 'name' => 'database', 'callback' => array( $installer, 'setupDatabase' ) ),
1505                         array( 'name' => 'tables', 'callback' => array( $installer, 'createTables' ) ),
1506                         array( 'name' => 'interwiki', 'callback' => array( $installer, 'populateInterwikiTable' ) ),
1507                         array( 'name' => 'stats', 'callback' => array( $this, 'populateSiteStats' ) ),
1508                         array( 'name' => 'keys', 'callback' => array( $this, 'generateKeys' ) ),
1509                         array( 'name' => 'sysop', 'callback' => array( $this, 'createSysop' ) ),
1510                         array( 'name' => 'mainpage', 'callback' => array( $this, 'createMainpage' ) ),
1511                 );
1512
1513                 // Build the array of install steps starting from the core install list,
1514                 // then adding any callbacks that wanted to attach after a given step
1515                 foreach ( $coreInstallSteps as $step ) {
1516                         $this->installSteps[] = $step;
1517                         if ( isset( $this->extraInstallSteps[$step['name']] ) ) {
1518                                 $this->installSteps = array_merge(
1519                                         $this->installSteps,
1520                                         $this->extraInstallSteps[$step['name']]
1521                                 );
1522                         }
1523                 }
1524
1525                 // Prepend any steps that want to be at the beginning
1526                 if ( isset( $this->extraInstallSteps['BEGINNING'] ) ) {
1527                         $this->installSteps = array_merge(
1528                                 $this->extraInstallSteps['BEGINNING'],
1529                                 $this->installSteps
1530                         );
1531                 }
1532
1533                 // Extensions should always go first, chance to tie into hooks and such
1534                 if ( count( $this->getVar( '_Extensions' ) ) ) {
1535                         array_unshift( $this->installSteps,
1536                                 array( 'name' => 'extensions', 'callback' => array( $this, 'includeExtensions' ) )
1537                         );
1538                         $this->installSteps[] = array(
1539                                 'name' => 'extension-tables',
1540                                 'callback' => array( $installer, 'createExtensionTables' )
1541                         );
1542                 }
1543
1544                 return $this->installSteps;
1545         }
1546
1547         /**
1548          * Actually perform the installation.
1549          *
1550          * @param callable $startCB A callback array for the beginning of each step
1551          * @param callable $endCB A callback array for the end of each step
1552          *
1553          * @return array Array of Status objects
1554          */
1555         public function performInstallation( $startCB, $endCB ) {
1556                 $installResults = array();
1557                 $installer = $this->getDBInstaller();
1558                 $installer->preInstall();
1559                 $steps = $this->getInstallSteps( $installer );
1560                 foreach ( $steps as $stepObj ) {
1561                         $name = $stepObj['name'];
1562                         call_user_func_array( $startCB, array( $name ) );
1563
1564                         // Perform the callback step
1565                         $status = call_user_func( $stepObj['callback'], $installer );
1566
1567                         // Output and save the results
1568                         call_user_func( $endCB, $name, $status );
1569                         $installResults[$name] = $status;
1570
1571                         // If we've hit some sort of fatal, we need to bail.
1572                         // Callback already had a chance to do output above.
1573                         if ( !$status->isOk() ) {
1574                                 break;
1575                         }
1576                 }
1577                 if ( $status->isOk() ) {
1578                         $this->setVar( '_InstallDone', true );
1579                 }
1580
1581                 return $installResults;
1582         }
1583
1584         /**
1585          * Generate $wgSecretKey. Will warn if we had to use an insecure random source.
1586          *
1587          * @return Status
1588          */
1589         public function generateKeys() {
1590                 $keys = array( 'wgSecretKey' => 64 );
1591                 if ( strval( $this->getVar( 'wgUpgradeKey' ) ) === '' ) {
1592                         $keys['wgUpgradeKey'] = 16;
1593                 }
1594
1595                 return $this->doGenerateKeys( $keys );
1596         }
1597
1598         /**
1599          * Generate a secret value for variables using our CryptRand generator.
1600          * Produce a warning if the random source was insecure.
1601          *
1602          * @param array $keys
1603          * @return Status
1604          */
1605         protected function doGenerateKeys( $keys ) {
1606                 $status = Status::newGood();
1607
1608                 $strong = true;
1609                 foreach ( $keys as $name => $length ) {
1610                         $secretKey = MWCryptRand::generateHex( $length, true );
1611                         if ( !MWCryptRand::wasStrong() ) {
1612                                 $strong = false;
1613                         }
1614
1615                         $this->setVar( $name, $secretKey );
1616                 }
1617
1618                 if ( !$strong ) {
1619                         $names = array_keys( $keys );
1620                         $names = preg_replace( '/^(.*)$/', '\$$1', $names );
1621                         global $wgLang;
1622                         $status->warning( 'config-insecure-keys', $wgLang->listToText( $names ), count( $names ) );
1623                 }
1624
1625                 return $status;
1626         }
1627
1628         /**
1629          * Create the first user account, grant it sysop and bureaucrat rights
1630          *
1631          * @return Status
1632          */
1633         protected function createSysop() {
1634                 $name = $this->getVar( '_AdminName' );
1635                 $user = User::newFromName( $name );
1636
1637                 if ( !$user ) {
1638                         // We should've validated this earlier anyway!
1639                         return Status::newFatal( 'config-admin-error-user', $name );
1640                 }
1641
1642                 if ( $user->idForName() == 0 ) {
1643                         $user->addToDatabase();
1644
1645                         try {
1646                                 $user->setPassword( $this->getVar( '_AdminPassword' ) );
1647                         } catch ( PasswordError $pwe ) {
1648                                 return Status::newFatal( 'config-admin-error-password', $name, $pwe->getMessage() );
1649                         }
1650
1651                         $user->addGroup( 'sysop' );
1652                         $user->addGroup( 'bureaucrat' );
1653                         if ( $this->getVar( '_AdminEmail' ) ) {
1654                                 $user->setEmail( $this->getVar( '_AdminEmail' ) );
1655                         }
1656                         $user->saveSettings();
1657
1658                         // Update user count
1659                         $ssUpdate = new SiteStatsUpdate( 0, 0, 0, 0, 1 );
1660                         $ssUpdate->doUpdate();
1661                 }
1662                 $status = Status::newGood();
1663
1664                 if ( $this->getVar( '_Subscribe' ) && $this->getVar( '_AdminEmail' ) ) {
1665                         $this->subscribeToMediaWikiAnnounce( $status );
1666                 }
1667
1668                 return $status;
1669         }
1670
1671         /**
1672          * @param Status $s
1673          */
1674         private function subscribeToMediaWikiAnnounce( Status $s ) {
1675                 $params = array(
1676                         'email' => $this->getVar( '_AdminEmail' ),
1677                         'language' => 'en',
1678                         'digest' => 0
1679                 );
1680
1681                 // Mailman doesn't support as many languages as we do, so check to make
1682                 // sure their selected language is available
1683                 $myLang = $this->getVar( '_UserLang' );
1684                 if ( in_array( $myLang, $this->mediaWikiAnnounceLanguages ) ) {
1685                         $myLang = $myLang == 'pt-br' ? 'pt_BR' : $myLang; // rewrite to Mailman's pt_BR
1686                         $params['language'] = $myLang;
1687                 }
1688
1689                 if ( MWHttpRequest::canMakeRequests() ) {
1690                         $res = MWHttpRequest::factory( $this->mediaWikiAnnounceUrl,
1691                                 array( 'method' => 'POST', 'postData' => $params ) )->execute();
1692                         if ( !$res->isOK() ) {
1693                                 $s->warning( 'config-install-subscribe-fail', $res->getMessage() );
1694                         }
1695                 } else {
1696                         $s->warning( 'config-install-subscribe-notpossible' );
1697                 }
1698         }
1699
1700         /**
1701          * Insert Main Page with default content.
1702          *
1703          * @param DatabaseInstaller $installer
1704          * @return Status
1705          */
1706         protected function createMainpage( DatabaseInstaller $installer ) {
1707                 $status = Status::newGood();
1708                 try {
1709                         $page = WikiPage::factory( Title::newMainPage() );
1710                         $content = new WikitextContent(
1711                                 wfMessage( 'mainpagetext' )->inContentLanguage()->text() . "\n\n" .
1712                                 wfMessage( 'mainpagedocfooter' )->inContentLanguage()->text()
1713                         );
1714
1715                         $page->doEditContent( $content,
1716                                 '',
1717                                 EDIT_NEW,
1718                                 false,
1719                                 User::newFromName( 'MediaWiki default' )
1720                         );
1721                 } catch ( MWException $e ) {
1722                         //using raw, because $wgShowExceptionDetails can not be set yet
1723                         $status->fatal( 'config-install-mainpage-failed', $e->getMessage() );
1724                 }
1725
1726                 return $status;
1727         }
1728
1729         /**
1730          * Override the necessary bits of the config to run an installation.
1731          */
1732         public static function overrideConfig() {
1733                 define( 'MW_NO_SESSION', 1 );
1734
1735                 // Don't access the database
1736                 $GLOBALS['wgUseDatabaseMessages'] = false;
1737                 // Don't cache langconv tables
1738                 $GLOBALS['wgLanguageConverterCacheType'] = CACHE_NONE;
1739                 // Debug-friendly
1740                 $GLOBALS['wgShowExceptionDetails'] = true;
1741                 // Don't break forms
1742                 $GLOBALS['wgExternalLinkTarget'] = '_blank';
1743
1744                 // Extended debugging
1745                 $GLOBALS['wgShowSQLErrors'] = true;
1746                 $GLOBALS['wgShowDBErrorBacktrace'] = true;
1747
1748                 // Allow multiple ob_flush() calls
1749                 $GLOBALS['wgDisableOutputCompression'] = true;
1750
1751                 // Use a sensible cookie prefix (not my_wiki)
1752                 $GLOBALS['wgCookiePrefix'] = 'mw_installer';
1753
1754                 // Some of the environment checks make shell requests, remove limits
1755                 $GLOBALS['wgMaxShellMemory'] = 0;
1756
1757                 // Don't bother embedding images into generated CSS, which is not cached
1758                 $GLOBALS['wgResourceLoaderLESSFunctions']['embeddable'] = function ( $frame, $less ) {
1759                         return $less->toBool( false );
1760                 };
1761         }
1762
1763         /**
1764          * Add an installation step following the given step.
1765          *
1766          * @param callable $callback A valid installation callback array, in this form:
1767          *    array( 'name' => 'some-unique-name', 'callback' => array( $obj, 'function' ) );
1768          * @param string $findStep The step to find. Omit to put the step at the beginning
1769          */
1770         public function addInstallStep( $callback, $findStep = 'BEGINNING' ) {
1771                 $this->extraInstallSteps[$findStep][] = $callback;
1772         }
1773
1774         /**
1775          * Disable the time limit for execution.
1776          * Some long-running pages (Install, Upgrade) will want to do this
1777          */
1778         protected function disableTimeLimit() {
1779                 wfSuppressWarnings();
1780                 set_time_limit( 0 );
1781                 wfRestoreWarnings();
1782         }
1783 }