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         // This is the absolute minimum PHP version we can support
  42         const MINIMUM_PHP_VERSION = '5.3.2';
  43
  44         /**
  45          * The oldest version of PCRE we can support.
  46          *
  47          * Defining this is necessary because PHP may be linked with a system version
  48          * of PCRE, which may be older than that bundled with the minimum PHP version.
  49          */
  50         const MINIMUM_PCRE_VERSION = '7.2';
  51
  52         /**
  53          * @var array
  54          */
  55         protected $settings;
  56
  57         /**
  58          * List of detected DBs, access using getCompiledDBs().
  59          *
  60          * @var array
  61          */
  62         protected $compiledDBs;
  63
  64         /**
  65          * Cached DB installer instances, access using getDBInstaller().
  66          *
  67          * @var array
  68          */
  69         protected $dbInstallers = array();
  70
  71         /**
  72          * Minimum memory size in MB.
  73          *
  74          * @var int
  75          */
  76         protected $minMemorySize = 50;
  77
  78         /**
  79          * Cached Title, used by parse().
  80          *
  81          * @var Title
  82          */
  83         protected $parserTitle;
  84
  85         /**
  86          * Cached ParserOptions, used by parse().
  87          *
  88          * @var ParserOptions
  89          */
  90         protected $parserOptions;
  91
  92         /**
  93          * Known database types. These correspond to the class names <type>Installer,
  94          * and are also MediaWiki database types valid for $wgDBtype.
  95          *
  96          * To add a new type, create a <type>Installer class and a Database<type>
  97          * class, and add a config-type-<type> message to MessagesEn.php.
  98          *
  99          * @var array
 100          */
 101         protected static $dbTypes = array(
 102                 'mysql',
 103                 'postgres',
 104                 'oracle',
 105                 'mssql',
 106                 'sqlite',
 107         );
 108
 109         /**
 110          * A list of environment check methods called by doEnvironmentChecks().
 111          * These may output warnings using showMessage(), and/or abort the
 112          * installation process by returning false.
 113          *
 114          * @var array
 115          */
 116         protected $envChecks = array(
 117                 'envCheckDB',
 118                 'envCheckRegisterGlobals',
 119                 'envCheckBrokenXML',
 120                 'envCheckMagicQuotes',
 121                 'envCheckMagicSybase',
 122                 'envCheckMbstring',
 123                 'envCheckSafeMode',
 124                 'envCheckXML',
 125                 'envCheckPCRE',
 126                 'envCheckMemory',
 127                 'envCheckCache',
 128                 'envCheckModSecurity',
 129                 'envCheckDiff3',
 130                 'envCheckGraphics',
 131                 'envCheckGit',
 132                 'envCheckServer',
 133                 'envCheckPath',
 134                 'envCheckExtension',
 135                 'envCheckShellLocale',
 136                 'envCheckUploadsDirectory',
 137                 'envCheckLibicu',
 138                 'envCheckSuhosinMaxValueLength',
 139                 'envCheckCtype',
 140                 'envCheckJSON',
 141         );
 142
 143         /**
 144          * MediaWiki configuration globals that will eventually be passed through
 145          * to LocalSettings.php. The names only are given here, the defaults
 146          * typically come from DefaultSettings.php.
 147          *
 148          * @var array
 149          */
 150         protected $defaultVarNames = array(
 151                 'wgSitename',
 152                 'wgPasswordSender',
 153                 'wgLanguageCode',
 154                 'wgRightsIcon',
 155                 'wgRightsText',
 156                 'wgRightsUrl',
 157                 'wgMainCacheType',
 158                 'wgEnableEmail',
 159                 'wgEnableUserEmail',
 160                 'wgEnotifUserTalk',
 161                 'wgEnotifWatchlist',
 162                 'wgEmailAuthentication',
 163                 'wgDBtype',
 164                 'wgDiff3',
 165                 'wgImageMagickConvertCommand',
 166                 'wgGitBin',
 167                 'IP',
 168                 'wgScriptPath',
 169                 'wgScriptExtension',
 170                 'wgMetaNamespace',
 171                 'wgDeletedDirectory',
 172                 'wgEnableUploads',
 173                 'wgShellLocale',
 174                 'wgSecretKey',
 175                 'wgUseInstantCommons',
 176                 'wgUpgradeKey',
 177                 'wgDefaultSkin',
 178                 'wgResourceLoaderMaxQueryLength',
 179         );
 180
 181         /**
 182          * Variables that are stored alongside globals, and are used for any
 183          * configuration of the installation process aside from the MediaWiki
 184          * configuration. Map of names to defaults.
 185          *
 186          * @var array
 187          */
 188         protected $internalDefaults = array(
 189                 '_UserLang' => 'en',
 190                 '_Environment' => false,
 191                 '_SafeMode' => false,
 192                 '_RaiseMemory' => false,
 193                 '_UpgradeDone' => false,
 194                 '_InstallDone' => false,
 195                 '_Caches' => array(),
 196                 '_InstallPassword' => '',
 197                 '_SameAccount' => true,
 198                 '_CreateDBAccount' => false,
 199                 '_NamespaceType' => 'site-name',
 200                 '_AdminName' => '', // will be set later, when the user selects language
 201                 '_AdminPassword' => '',
 202                 '_AdminPasswordConfirm' => '',
 203                 '_AdminEmail' => '',
 204                 '_Subscribe' => false,
 205                 '_SkipOptional' => 'continue',
 206                 '_RightsProfile' => 'wiki',
 207                 '_LicenseCode' => 'none',
 208                 '_CCDone' => false,
 209                 '_Extensions' => array(),
 210                 '_MemCachedServers' => '',
 211                 '_UpgradeKeySupplied' => false,
 212                 '_ExistingDBSettings' => false,
 213
 214                 // $wgLogo is probably wrong (bug 48084); set something that will work.
 215                 // Single quotes work fine here, as LocalSettingsGenerator outputs this unescaped.
 216                 'wgLogo' => '$wgStylePath/common/images/wiki.png',
 217         );
 218
 219         /**
 220          * The actual list of installation steps. This will be initialized by getInstallSteps()
 221          *
 222          * @var array
 223          */
 224         private $installSteps = array();
 225
 226         /**
 227          * Extra steps for installation, for things like DatabaseInstallers to modify
 228          *
 229          * @var array
 230          */
 231         protected $extraInstallSteps = array();
 232
 233         /**
 234          * Known object cache types and the functions used to test for their existence.
 235          *
 236          * @var array
 237          */
 238         protected $objectCaches = array(
 239                 'xcache' => 'xcache_get',
 240                 'apc' => 'apc_fetch',
 241                 'wincache' => 'wincache_ucache_get'
 242         );
 243
 244         /**
 245          * User rights profiles.
 246          *
 247          * @var array
 248          */
 249         public $rightsProfiles = array(
 250                 'wiki' => array(),
 251                 'no-anon' => array(
 252                         '*' => array( 'edit' => false )
 253                 ),
 254                 'fishbowl' => array(
 255                         '*' => array(
 256                                 'createaccount' => false,
 257                                 'edit' => false,
 258                         ),
 259                 ),
 260                 'private' => array(
 261                         '*' => array(
 262                                 'createaccount' => false,
 263                                 'edit' => false,
 264                                 'read' => false,
 265                         ),
 266                 ),
 267         );
 268
 269         /**
 270          * License types.
 271          *
 272          * @var array
 273          */
 274         public $licenses = array(
 275                 'cc-by' => array(
 276                         'url' => 'http://creativecommons.org/licenses/by/3.0/',
 277                         'icon' => '{$wgStylePath}/common/images/cc-by.png',
 278                 ),
 279                 'cc-by-sa' => array(
 280                         'url' => 'http://creativecommons.org/licenses/by-sa/3.0/',
 281                         'icon' => '{$wgStylePath}/common/images/cc-by-sa.png',
 282                 ),
 283                 'cc-by-nc-sa' => array(
 284                         'url' => 'http://creativecommons.org/licenses/by-nc-sa/3.0/',
 285                         'icon' => '{$wgStylePath}/common/images/cc-by-nc-sa.png',
 286                 ),
 287                 'cc-0' => array(
 288                         'url' => 'https://creativecommons.org/publicdomain/zero/1.0/',
 289                         'icon' => '{$wgStylePath}/common/images/cc-0.png',
 290                 ),
 291                 'pd' => array(
 292                         'url' => '',
 293                         'icon' => '{$wgStylePath}/common/images/public-domain.png',
 294                 ),
 295                 'gfdl' => array(
 296                         'url' => 'http://www.gnu.org/copyleft/fdl.html',
 297                         'icon' => '{$wgStylePath}/common/images/gnu-fdl.png',
 298                 ),
 299                 'none' => array(
 300                         'url' => '',
 301                         'icon' => '',
 302                         'text' => ''
 303                 ),
 304                 'cc-choose' => array(
 305                         // Details will be filled in by the selector.
 306                         'url' => '',
 307                         'icon' => '',
 308                         'text' => '',
 309                 ),
 310         );
 311
 312         /**
 313          * URL to mediawiki-announce subscription
 314          */
 315         protected $mediaWikiAnnounceUrl =
 316                 'https://lists.wikimedia.org/mailman/subscribe/mediawiki-announce';
 317
 318         /**
 319          * Supported language codes for Mailman
 320          */
 321         protected $mediaWikiAnnounceLanguages = array(
 322                 'ca', 'cs', 'da', 'de', 'en', 'es', 'et', 'eu', 'fi', 'fr', 'hr', 'hu',
 323                 'it', 'ja', 'ko', 'lt', 'nl', 'no', 'pl', 'pt', 'pt-br', 'ro', 'ru',
 324                 'sl', 'sr', 'sv', 'tr', 'uk'
 325         );
 326
 327         /**
 328          * UI interface for displaying a short message
 329          * The parameters are like parameters to wfMessage().
 330          * The messages will be in wikitext format, which will be converted to an
 331          * output format such as HTML or text before being sent to the user.
 332          * @param string $msg
 333          */
 334         abstract public function showMessage( $msg /*, ... */ );
 335
 336         /**
 337          * Same as showMessage(), but for displaying errors
 338          * @param string $msg
 339          */
 340         abstract public function showError( $msg /*, ... */ );
 341
 342         /**
 343          * Show a message to the installing user by using a Status object
 344          * @param Status $status
 345          */
 346         abstract public function showStatusMessage( Status $status );
 347
 348         /**
 349          * Constructor, always call this from child classes.
 350          */
 351         public function __construct() {
 352                 global $wgMessagesDirs, $wgUser;
 353
 354                 // Disable the i18n cache and LoadBalancer
 355                 Language::getLocalisationCache()->disableBackend();
 356                 LBFactory::disableBackend();
 357
 358                 // Load the installer's i18n.
 359                 $wgMessagesDirs['MediawikiInstaller'] = __DIR__ . '/i18n';
 360
 361                 // Having a user with id = 0 safeguards us from DB access via User::loadOptions().
 362                 $wgUser = User::newFromId( 0 );
 363
 364                 $this->settings = $this->internalDefaults;
 365
 366                 foreach ( $this->defaultVarNames as $var ) {
 367                         $this->settings[$var] = $GLOBALS[$var];
 368                 }
 369
 370                 $compiledDBs = array();
 371                 foreach ( self::getDBTypes() as $type ) {
 372                         $installer = $this->getDBInstaller( $type );
 373
 374                         if ( !$installer->isCompiled() ) {
 375                                 continue;
 376                         }
 377                         $compiledDBs[] = $type;
 378
 379                         $defaults = $installer->getGlobalDefaults();
 380
 381                         foreach ( $installer->getGlobalNames() as $var ) {
 382                                 if ( isset( $defaults[$var] ) ) {
 383                                         $this->settings[$var] = $defaults[$var];
 384                                 } else {
 385                                         $this->settings[$var] = $GLOBALS[$var];
 386                                 }
 387                         }
 388                 }
 389                 $this->compiledDBs = $compiledDBs;
 390
 391                 $this->parserTitle = Title::newFromText( 'Installer' );
 392                 $this->parserOptions = new ParserOptions; // language will  be wrong :(
 393                 $this->parserOptions->setEditSection( false );
 394         }
 395
 396         /**
 397          * Get a list of known DB types.
 398          *
 399          * @return array
 400          */
 401         public static function getDBTypes() {
 402                 return self::$dbTypes;
 403         }
 404
 405         /**
 406          * Do initial checks of the PHP environment. Set variables according to
 407          * the observed environment.
 408          *
 409          * It's possible that this may be called under the CLI SAPI, not the SAPI
 410          * that the wiki will primarily run under. In that case, the subclass should
 411          * initialise variables such as wgScriptPath, before calling this function.
 412          *
 413          * Under the web subclass, it can already be assumed that PHP 5+ is in use
 414          * and that sessions are working.
 415          *
 416          * @return Status
 417          */
 418         public function doEnvironmentChecks() {
 419                 $phpVersion = phpversion();
 420                 if ( version_compare( $phpVersion, self::MINIMUM_PHP_VERSION, '>=' ) ) {
 421                         $this->showMessage( 'config-env-php', $phpVersion );
 422                         $good = true;
 423                 } else {
 424                         $this->showMessage( 'config-env-php-toolow', $phpVersion, self::MINIMUM_PHP_VERSION );
 425                         $good = false;
 426                 }
 427
 428                 // Must go here because an old version of PCRE can prevent other checks from completing
 429                 if ( $good ) {
 430                         list( $pcreVersion ) = explode( ' ', PCRE_VERSION, 2 );
 431                         if ( version_compare( $pcreVersion, self::MINIMUM_PCRE_VERSION, '<' ) ) {
 432                                 $this->showError( 'config-pcre-old', self::MINIMUM_PCRE_VERSION, $pcreVersion );
 433                                 $good = false;
 434                         }
 435                 }
 436
 437                 if ( $good ) {
 438                         foreach ( $this->envChecks as $check ) {
 439                                 $status = $this->$check();
 440                                 if ( $status === false ) {
 441                                         $good = false;
 442                                 }
 443                         }
 444                 }
 445
 446                 $this->setVar( '_Environment', $good );
 447
 448                 return $good ? Status::newGood() : Status::newFatal( 'config-env-bad' );
 449         }
 450
 451         /**
 452          * Set a MW configuration variable, or internal installer configuration variable.
 453          *
 454          * @param string $name
 455          * @param mixed $value
 456          */
 457         public function setVar( $name, $value ) {
 458                 $this->settings[$name] = $value;
 459         }
 460
 461         /**
 462          * Get an MW configuration variable, or internal installer configuration variable.
 463          * The defaults come from $GLOBALS (ultimately DefaultSettings.php).
 464          * Installer variables are typically prefixed by an underscore.
 465          *
 466          * @param string $name
 467          * @param mixed $default
 468          *
 469          * @return mixed
 470          */
 471         public function getVar( $name, $default = null ) {
 472                 if ( !isset( $this->settings[$name] ) ) {
 473                         return $default;
 474                 } else {
 475                         return $this->settings[$name];
 476                 }
 477         }
 478
 479         /**
 480          * Get a list of DBs supported by current PHP setup
 481          *
 482          * @return array
 483          */
 484         public function getCompiledDBs() {
 485                 return $this->compiledDBs;
 486         }
 487
 488         /**
 489          * Get an instance of DatabaseInstaller for the specified DB type.
 490          *
 491          * @param mixed $type DB installer for which is needed, false to use default.
 492          *
 493          * @return DatabaseInstaller
 494          */
 495         public function getDBInstaller( $type = false ) {
 496                 if ( !$type ) {
 497                         $type = $this->getVar( 'wgDBtype' );
 498                 }
 499
 500                 $type = strtolower( $type );
 501
 502                 if ( !isset( $this->dbInstallers[$type] ) ) {
 503                         $class = ucfirst( $type ) . 'Installer';
 504                         $this->dbInstallers[$type] = new $class( $this );
 505                 }
 506
 507                 return $this->dbInstallers[$type];
 508         }
 509
 510         /**
 511          * Determine if LocalSettings.php exists. If it does, return its variables.
 512          *
 513          * @return array
 514          */
 515         public static function getExistingLocalSettings() {
 516                 global $IP;
 517
 518                 wfSuppressWarnings();
 519                 $_lsExists = file_exists( "$IP/LocalSettings.php" );
 520                 wfRestoreWarnings();
 521
 522                 if ( !$_lsExists ) {
 523                         return false;
 524                 }
 525                 unset( $_lsExists );
 526
 527                 require "$IP/includes/DefaultSettings.php";
 528                 require "$IP/LocalSettings.php";
 529
 530                 return get_defined_vars();
 531         }
 532
 533         /**
 534          * Get a fake password for sending back to the user in HTML.
 535          * This is a security mechanism to avoid compromise of the password in the
 536          * event of session ID compromise.
 537          *
 538          * @param string $realPassword
 539          *
 540          * @return string
 541          */
 542         public function getFakePassword( $realPassword ) {
 543                 return str_repeat( '*', strlen( $realPassword ) );
 544         }
 545
 546         /**
 547          * Set a variable which stores a password, except if the new value is a
 548          * fake password in which case leave it as it is.
 549          *
 550          * @param string $name
 551          * @param mixed $value
 552          */
 553         public function setPassword( $name, $value ) {
 554                 if ( !preg_match( '/^\*+$/', $value ) ) {
 555                         $this->setVar( $name, $value );
 556                 }
 557         }
 558
 559         /**
 560          * On POSIX systems return the primary group of the webserver we're running under.
 561          * On other systems just returns null.
 562          *
 563          * This is used to advice the user that he should chgrp his mw-config/data/images directory as the
 564          * webserver user before he can install.
 565          *
 566          * Public because SqliteInstaller needs it, and doesn't subclass Installer.
 567          *
 568          * @return mixed
 569          */
 570         public static function maybeGetWebserverPrimaryGroup() {
 571                 if ( !function_exists( 'posix_getegid' ) || !function_exists( 'posix_getpwuid' ) ) {
 572                         # I don't know this, this isn't UNIX.
 573                         return null;
 574                 }
 575
 576                 # posix_getegid() *not* getmygid() because we want the group of the webserver,
 577                 # not whoever owns the current script.
 578                 $gid = posix_getegid();
 579                 $getpwuid = posix_getpwuid( $gid );
 580                 $group = $getpwuid['name'];
 581
 582                 return $group;
 583         }
 584
 585         /**
 586          * Convert wikitext $text to HTML.
 587          *
 588          * This is potentially error prone since many parser features require a complete
 589          * installed MW database. The solution is to just not use those features when you
 590          * write your messages. This appears to work well enough. Basic formatting and
 591          * external links work just fine.
 592          *
 593          * But in case a translator decides to throw in a "#ifexist" or internal link or
 594          * whatever, this function is guarded to catch the attempted DB access and to present
 595          * some fallback text.
 596          *
 597          * @param string $text
 598          * @param bool $lineStart
 599          * @return string
 600          */
 601         public function parse( $text, $lineStart = false ) {
 602                 global $wgParser;
 603
 604                 try {
 605                         $out = $wgParser->parse( $text, $this->parserTitle, $this->parserOptions, $lineStart );
 606                         $html = $out->getText();
 607                 } catch ( DBAccessError $e ) {
 608                         $html = '<!--DB access attempted during parse-->  ' . htmlspecialchars( $text );
 609
 610                         if ( !empty( $this->debug ) ) {
 611                                 $html .= "<!--\n" . $e->getTraceAsString() . "\n-->";
 612                         }
 613                 }
 614
 615                 return $html;
 616         }
 617
 618         /**
 619          * @return ParserOptions
 620          */
 621         public function getParserOptions() {
 622                 return $this->parserOptions;
 623         }
 624
 625         public function disableLinkPopups() {
 626                 $this->parserOptions->setExternalLinkTarget( false );
 627         }
 628
 629         public function restoreLinkPopups() {
 630                 global $wgExternalLinkTarget;
 631                 $this->parserOptions->setExternalLinkTarget( $wgExternalLinkTarget );
 632         }
 633
 634         /**
 635          * Install step which adds a row to the site_stats table with appropriate
 636          * initial values.
 637          *
 638          * @param DatabaseInstaller $installer
 639          *
 640          * @return Status
 641          */
 642         public function populateSiteStats( DatabaseInstaller $installer ) {
 643                 $status = $installer->getConnection();
 644                 if ( !$status->isOK() ) {
 645                         return $status;
 646                 }
 647                 $status->value->insert(
 648                         'site_stats',
 649                         array(
 650                                 'ss_row_id' => 1,
 651                                 'ss_total_views' => 0,
 652                                 'ss_total_edits' => 0,
 653                                 'ss_good_articles' => 0,
 654                                 'ss_total_pages' => 0,
 655                                 'ss_users' => 0,
 656                                 'ss_images' => 0
 657                         ),
 658                         __METHOD__, 'IGNORE'
 659                 );
 660
 661                 return Status::newGood();
 662         }
 663
 664         /**
 665          * Exports all wg* variables stored by the installer into global scope.
 666          */
 667         public function exportVars() {
 668                 foreach ( $this->settings as $name => $value ) {
 669                         if ( substr( $name, 0, 2 ) == 'wg' ) {
 670                                 $GLOBALS[$name] = $value;
 671                         }
 672                 }
 673         }
 674
 675         /**
 676          * Environment check for DB types.
 677          * @return bool
 678          */
 679         protected function envCheckDB() {
 680                 global $wgLang;
 681
 682                 $allNames = array();
 683
 684                 // Messages: config-type-mysql, config-type-postgres, config-type-oracle,
 685                 // config-type-sqlite
 686                 foreach ( self::getDBTypes() as $name ) {
 687                         $allNames[] = wfMessage( "config-type-$name" )->text();
 688                 }
 689
 690                 $databases = $this->getCompiledDBs();
 691
 692                 $databases = array_flip( $databases );
 693                 foreach ( array_keys( $databases ) as $db ) {
 694                         $installer = $this->getDBInstaller( $db );
 695                         $status = $installer->checkPrerequisites();
 696                         if ( !$status->isGood() ) {
 697                                 $this->showStatusMessage( $status );
 698                         }
 699                         if ( !$status->isOK() ) {
 700                                 unset( $databases[$db] );
 701                         }
 702                 }
 703                 $databases = array_flip( $databases );
 704                 if ( !$databases ) {
 705                         $this->showError( 'config-no-db', $wgLang->commaList( $allNames ) );
 706
 707                         // @todo FIXME: This only works for the web installer!
 708                         return false;
 709                 }
 710
 711                 return true;
 712         }
 713
 714         /**
 715          * Environment check for register_globals.
 716          */
 717         protected function envCheckRegisterGlobals() {
 718                 if ( wfIniGetBool( 'register_globals' ) ) {
 719                         $this->showMessage( 'config-register-globals' );
 720                 }
 721         }
 722
 723         /**
 724          * Some versions of libxml+PHP break < and > encoding horribly
 725          * @return bool
 726          */
 727         protected function envCheckBrokenXML() {
 728                 $test = new PhpXmlBugTester();
 729                 if ( !$test->ok ) {
 730                         $this->showError( 'config-brokenlibxml' );
 731
 732                         return false;
 733                 }
 734
 735                 return true;
 736         }
 737
 738         /**
 739          * Environment check for magic_quotes_runtime.
 740          * @return bool
 741          */
 742         protected function envCheckMagicQuotes() {
 743                 if ( wfIniGetBool( "magic_quotes_runtime" ) ) {
 744                         $this->showError( 'config-magic-quotes-runtime' );
 745
 746                         return false;
 747                 }
 748
 749                 return true;
 750         }
 751
 752         /**
 753          * Environment check for magic_quotes_sybase.
 754          * @return bool
 755          */
 756         protected function envCheckMagicSybase() {
 757                 if ( wfIniGetBool( 'magic_quotes_sybase' ) ) {
 758                         $this->showError( 'config-magic-quotes-sybase' );
 759
 760                         return false;
 761                 }
 762
 763                 return true;
 764         }
 765
 766         /**
 767          * Environment check for mbstring.func_overload.
 768          * @return bool
 769          */
 770         protected function envCheckMbstring() {
 771                 if ( wfIniGetBool( 'mbstring.func_overload' ) ) {
 772                         $this->showError( 'config-mbstring' );
 773
 774                         return false;
 775                 }
 776
 777                 return true;
 778         }
 779
 780         /**
 781          * Environment check for safe_mode.
 782          * @return bool
 783          */
 784         protected function envCheckSafeMode() {
 785                 if ( wfIniGetBool( 'safe_mode' ) ) {
 786                         $this->setVar( '_SafeMode', true );
 787                         $this->showMessage( 'config-safe-mode' );
 788                 }
 789
 790                 return true;
 791         }
 792
 793         /**
 794          * Environment check for the XML module.
 795          * @return bool
 796          */
 797         protected function envCheckXML() {
 798                 if ( !function_exists( "utf8_encode" ) ) {
 799                         $this->showError( 'config-xml-bad' );
 800
 801                         return false;
 802                 }
 803
 804                 return true;
 805         }
 806
 807         /**
 808          * Environment check for the PCRE module.
 809          *
 810          * @note If this check were to fail, the parser would
 811          *   probably throw an exception before the result
 812          *   of this check is shown to the user.
 813          * @return bool
 814          */
 815         protected function envCheckPCRE() {
 816                 wfSuppressWarnings();
 817                 $regexd = preg_replace( '/[\x{0430}-\x{04FF}]/iu', '', '-АБВГД-' );
 818                 // Need to check for \p support too, as PCRE can be compiled
 819                 // with utf8 support, but not unicode property support.
 820                 // check that \p{Zs} (space separators) matches
 821                 // U+3000 (Ideographic space)
 822                 $regexprop = preg_replace( '/\p{Zs}/u', '', "-\xE3\x80\x80-" );
 823                 wfRestoreWarnings();
 824                 if ( $regexd != '--' || $regexprop != '--' ) {
 825                         $this->showError( 'config-pcre-no-utf8' );
 826
 827                         return false;
 828                 }
 829
 830                 return true;
 831         }
 832
 833         /**
 834          * Environment check for available memory.
 835          * @return bool
 836          */
 837         protected function envCheckMemory() {
 838                 $limit = ini_get( 'memory_limit' );
 839
 840                 if ( !$limit || $limit == -1 ) {
 841                         return true;
 842                 }
 843
 844                 $n = wfShorthandToInteger( $limit );
 845
 846                 if ( $n < $this->minMemorySize * 1024 * 1024 ) {
 847                         $newLimit = "{$this->minMemorySize}M";
 848
 849                         if ( ini_set( "memory_limit", $newLimit ) === false ) {
 850                                 $this->showMessage( 'config-memory-bad', $limit );
 851                         } else {
 852                                 $this->showMessage( 'config-memory-raised', $limit, $newLimit );
 853                                 $this->setVar( '_RaiseMemory', true );
 854                         }
 855                 }
 856
 857                 return true;
 858         }
 859
 860         /**
 861          * Environment check for compiled object cache types.
 862          */
 863         protected function envCheckCache() {
 864                 $caches = array();
 865                 foreach ( $this->objectCaches as $name => $function ) {
 866                         if ( function_exists( $function ) ) {
 867                                 if ( $name == 'xcache' && !wfIniGetBool( 'xcache.var_size' ) ) {
 868                                         continue;
 869                                 }
 870                                 $caches[$name] = true;
 871                         }
 872                 }
 873
 874                 if ( !$caches ) {
 875                         $this->showMessage( 'config-no-cache' );
 876                 }
 877
 878                 $this->setVar( '_Caches', $caches );
 879         }
 880
 881         /**
 882          * Scare user to death if they have mod_security
 883          * @return bool
 884          */
 885         protected function envCheckModSecurity() {
 886                 if ( self::apacheModulePresent( 'mod_security' ) ) {
 887                         $this->showMessage( 'config-mod-security' );
 888                 }
 889
 890                 return true;
 891         }
 892
 893         /**
 894          * Search for GNU diff3.
 895          * @return bool
 896          */
 897         protected function envCheckDiff3() {
 898                 $names = array( "gdiff3", "diff3", "diff3.exe" );
 899                 $versionInfo = array( '$1 --version 2>&1', 'GNU diffutils' );
 900
 901                 $diff3 = self::locateExecutableInDefaultPaths( $names, $versionInfo );
 902
 903                 if ( $diff3 ) {
 904                         $this->setVar( 'wgDiff3', $diff3 );
 905                 } else {
 906                         $this->setVar( 'wgDiff3', false );
 907                         $this->showMessage( 'config-diff3-bad' );
 908                 }
 909
 910                 return true;
 911         }
 912
 913         /**
 914          * Environment check for ImageMagick and GD.
 915          * @return bool
 916          */
 917         protected function envCheckGraphics() {
 918                 $names = array( wfIsWindows() ? 'convert.exe' : 'convert' );
 919                 $versionInfo = array( '$1 -version', 'ImageMagick' );
 920                 $convert = self::locateExecutableInDefaultPaths( $names, $versionInfo );
 921
 922                 $this->setVar( 'wgImageMagickConvertCommand', '' );
 923                 if ( $convert ) {
 924                         $this->setVar( 'wgImageMagickConvertCommand', $convert );
 925                         $this->showMessage( 'config-imagemagick', $convert );
 926
 927                         return true;
 928                 } elseif ( function_exists( 'imagejpeg' ) ) {
 929                         $this->showMessage( 'config-gd' );
 930                 } else {
 931                         $this->showMessage( 'config-no-scaling' );
 932                 }
 933
 934                 return true;
 935         }
 936
 937         /**
 938          * Search for git.
 939          *
 940          * @since 1.22
 941          * @return bool
 942          */
 943         protected function envCheckGit() {
 944                 $names = array( wfIsWindows() ? 'git.exe' : 'git' );
 945                 $versionInfo = array( '$1 --version', 'git version' );
 946
 947                 $git = self::locateExecutableInDefaultPaths( $names, $versionInfo );
 948
 949                 if ( $git ) {
 950                         $this->setVar( 'wgGitBin', $git );
 951                         $this->showMessage( 'config-git', $git );
 952                 } else {
 953                         $this->setVar( 'wgGitBin', false );
 954                         $this->showMessage( 'config-git-bad' );
 955                 }
 956
 957                 return true;
 958         }
 959
 960         /**
 961          * Environment check for the server hostname.
 962          */
 963         protected function envCheckServer() {
 964                 $server = $this->envGetDefaultServer();
 965                 if ( $server !== null ) {
 966                         $this->showMessage( 'config-using-server', $server );
 967                         $this->setVar( 'wgServer', $server );
 968                 }
 969
 970                 return true;
 971         }
 972
 973         /**
 974          * Helper function to be called from envCheckServer()
 975          * @return string
 976          */
 977         abstract protected function envGetDefaultServer();
 978
 979         /**
 980          * Environment check for setting $IP and $wgScriptPath.
 981          * @return bool
 982          */
 983         protected function envCheckPath() {
 984                 global $IP;
 985                 $IP = dirname( dirname( __DIR__ ) );
 986                 $this->setVar( 'IP', $IP );
 987
 988                 $this->showMessage(
 989                         'config-using-uri',
 990                         $this->getVar( 'wgServer' ),
 991                         $this->getVar( 'wgScriptPath' )
 992                 );
 993
 994                 return true;
 995         }
 996
 997         /**
 998          * Environment check for setting the preferred PHP file extension.
 999          * @return bool
1000          */
1001         protected function envCheckExtension() {
1002                 // @todo FIXME: Detect this properly
1003                 if ( defined( 'MW_INSTALL_PHP5_EXT' ) ) {
1004                         $ext = 'php5';
1005                 } else {
1006                         $ext = 'php';
1007                 }
1008                 $this->setVar( 'wgScriptExtension', ".$ext" );
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 envCheckJSON() {
1215                 if ( !function_exists( 'json_decode' ) ) {
1216                         $this->showError( 'config-json' );
1217
1218                         return false;
1219                 }
1220
1221                 return true;
1222         }
1223
1224         /**
1225          * Get an array of likely places we can find executables. Check a bunch
1226          * of known Unix-like defaults, as well as the PATH environment variable
1227          * (which should maybe make it work for Windows?)
1228          *
1229          * @return array
1230          */
1231         protected static function getPossibleBinPaths() {
1232                 return array_merge(
1233                         array( '/usr/bin', '/usr/local/bin', '/opt/csw/bin',
1234                                 '/usr/gnu/bin', '/usr/sfw/bin', '/sw/bin', '/opt/local/bin' ),
1235                         explode( PATH_SEPARATOR, getenv( 'PATH' ) )
1236                 );
1237         }
1238
1239         /**
1240          * Search a path for any of the given executable names. Returns the
1241          * executable name if found. Also checks the version string returned
1242          * by each executable.
1243          *
1244          * Used only by environment checks.
1245          *
1246          * @param string $path path to search
1247          * @param array $names of executable names
1248          * @param array|bool $versionInfo False or array with two members:
1249          *   0 => Command to run for version check, with $1 for the full executable name
1250          *   1 => String to compare the output with
1251          *
1252          * If $versionInfo is not false, only executables with a version
1253          * matching $versionInfo[1] will be returned.
1254          * @return bool|string
1255          */
1256         public static function locateExecutable( $path, $names, $versionInfo = false ) {
1257                 if ( !is_array( $names ) ) {
1258                         $names = array( $names );
1259                 }
1260
1261                 foreach ( $names as $name ) {
1262                         $command = $path . DIRECTORY_SEPARATOR . $name;
1263
1264                         wfSuppressWarnings();
1265                         $file_exists = file_exists( $command );
1266                         wfRestoreWarnings();
1267
1268                         if ( $file_exists ) {
1269                                 if ( !$versionInfo ) {
1270                                         return $command;
1271                                 }
1272
1273                                 $file = str_replace( '$1', wfEscapeShellArg( $command ), $versionInfo[0] );
1274                                 if ( strstr( wfShellExec( $file ), $versionInfo[1] ) !== false ) {
1275                                         return $command;
1276                                 }
1277                         }
1278                 }
1279
1280                 return false;
1281         }
1282
1283         /**
1284          * Same as locateExecutable(), but checks in getPossibleBinPaths() by default
1285          * @see locateExecutable()
1286          * @param array $names Array of possible names.
1287          * @param array|bool $versionInfo Default: false or array with two members:
1288          *   0 => Command to run for version check, with $1 for the full executable name
1289          *   1 => String to compare the output with
1290          *
1291          * If $versionInfo is not false, only executables with a version
1292          * matching $versionInfo[1] will be returned.
1293          * @return bool|string
1294          */
1295         public static function locateExecutableInDefaultPaths( $names, $versionInfo = false ) {
1296                 foreach ( self::getPossibleBinPaths() as $path ) {
1297                         $exe = self::locateExecutable( $path, $names, $versionInfo );
1298                         if ( $exe !== false ) {
1299                                 return $exe;
1300                         }
1301                 }
1302
1303                 return false;
1304         }
1305
1306         /**
1307          * Checks if scripts located in the given directory can be executed via the given URL.
1308          *
1309          * Used only by environment checks.
1310          * @param string $dir
1311          * @param string $url
1312          * @return bool|int|string
1313          */
1314         public function dirIsExecutable( $dir, $url ) {
1315                 $scriptTypes = array(
1316                         'php' => array(
1317                                 "<?php echo 'ex' . 'ec';",
1318                                 "#!/var/env php5\n<?php echo 'ex' . 'ec';",
1319                         ),
1320                 );
1321
1322                 // it would be good to check other popular languages here, but it'll be slow.
1323
1324                 wfSuppressWarnings();
1325
1326                 foreach ( $scriptTypes as $ext => $contents ) {
1327                         foreach ( $contents as $source ) {
1328                                 $file = 'exectest.' . $ext;
1329
1330                                 if ( !file_put_contents( $dir . $file, $source ) ) {
1331                                         break;
1332                                 }
1333
1334                                 try {
1335                                         $text = Http::get( $url . $file, array( 'timeout' => 3 ) );
1336                                 } catch ( MWException $e ) {
1337                                         // Http::get throws with allow_url_fopen = false and no curl extension.
1338                                         $text = null;
1339                                 }
1340                                 unlink( $dir . $file );
1341
1342                                 if ( $text == 'exec' ) {
1343                                         wfRestoreWarnings();
1344
1345                                         return $ext;
1346                                 }
1347                         }
1348                 }
1349
1350                 wfRestoreWarnings();
1351
1352                 return false;
1353         }
1354
1355         /**
1356          * Checks for presence of an Apache module. Works only if PHP is running as an Apache module, too.
1357          *
1358          * @param string $moduleName Name of module to check.
1359          * @return bool
1360          */
1361         public static function apacheModulePresent( $moduleName ) {
1362                 if ( function_exists( 'apache_get_modules' ) && in_array( $moduleName, apache_get_modules() ) ) {
1363                         return true;
1364                 }
1365                 // try it the hard way
1366                 ob_start();
1367                 phpinfo( INFO_MODULES );
1368                 $info = ob_get_clean();
1369
1370                 return strpos( $info, $moduleName ) !== false;
1371         }
1372
1373         /**
1374          * ParserOptions are constructed before we determined the language, so fix it
1375          *
1376          * @param Language $lang
1377          */
1378         public function setParserLanguage( $lang ) {
1379                 $this->parserOptions->setTargetLanguage( $lang );
1380                 $this->parserOptions->setUserLang( $lang );
1381         }
1382
1383         /**
1384          * Overridden by WebInstaller to provide lastPage parameters.
1385          * @param string $page
1386          * @return string
1387          */
1388         protected function getDocUrl( $page ) {
1389                 return "{$_SERVER['PHP_SELF']}?page=" . urlencode( $page );
1390         }
1391
1392         /**
1393          * Finds extensions that follow the format /extensions/Name/Name.php,
1394          * and returns an array containing the value for 'Name' for each found extension.
1395          *
1396          * @return array
1397          */
1398         public function findExtensions() {
1399                 if ( $this->getVar( 'IP' ) === null ) {
1400                         return array();
1401                 }
1402
1403                 $extDir = $this->getVar( 'IP' ) . '/extensions';
1404                 if ( !is_readable( $extDir ) || !is_dir( $extDir ) ) {
1405                         return array();
1406                 }
1407
1408                 $dh = opendir( $extDir );
1409                 $exts = array();
1410                 while ( ( $file = readdir( $dh ) ) !== false ) {
1411                         if ( !is_dir( "$extDir/$file" ) ) {
1412                                 continue;
1413                         }
1414                         if ( file_exists( "$extDir/$file/$file.php" ) ) {
1415                                 $exts[] = $file;
1416                         }
1417                 }
1418                 closedir( $dh );
1419                 natcasesort( $exts );
1420
1421                 return $exts;
1422         }
1423
1424         /**
1425          * Installs the auto-detected extensions.
1426          *
1427          * @return Status
1428          */
1429         protected function includeExtensions() {
1430                 global $IP;
1431                 $exts = $this->getVar( '_Extensions' );
1432                 $IP = $this->getVar( 'IP' );
1433
1434                 /**
1435                  * We need to include DefaultSettings before including extensions to avoid
1436                  * warnings about unset variables. However, the only thing we really
1437                  * want here is $wgHooks['LoadExtensionSchemaUpdates']. This won't work
1438                  * if the extension has hidden hook registration in $wgExtensionFunctions,
1439                  * but we're not opening that can of worms
1440                  * @see https://bugzilla.wikimedia.org/show_bug.cgi?id=26857
1441                  */
1442                 global $wgAutoloadClasses;
1443                 $wgAutoloadClasses = array();
1444
1445                 require "$IP/includes/DefaultSettings.php";
1446
1447                 foreach ( $exts as $e ) {
1448                         require_once "$IP/extensions/$e/$e.php";
1449                 }
1450
1451                 $hooksWeWant = isset( $wgHooks['LoadExtensionSchemaUpdates'] ) ?
1452                         $wgHooks['LoadExtensionSchemaUpdates'] : array();
1453
1454                 // Unset everyone else's hooks. Lord knows what someone might be doing
1455                 // in ParserFirstCallInit (see bug 27171)
1456                 $GLOBALS['wgHooks'] = array( 'LoadExtensionSchemaUpdates' => $hooksWeWant );
1457
1458                 return Status::newGood();
1459         }
1460
1461         /**
1462          * Get an array of install steps. Should always be in the format of
1463          * array(
1464          *   'name'     => 'someuniquename',
1465          *   'callback' => array( $obj, 'method' ),
1466          * )
1467          * There must be a config-install-$name message defined per step, which will
1468          * be shown on install.
1469          *
1470          * @param DatabaseInstaller $installer DatabaseInstaller so we can make callbacks
1471          * @return array
1472          */
1473         protected function getInstallSteps( DatabaseInstaller $installer ) {
1474                 $coreInstallSteps = array(
1475                         array( 'name' => 'database', 'callback' => array( $installer, 'setupDatabase' ) ),
1476                         array( 'name' => 'tables', 'callback' => array( $installer, 'createTables' ) ),
1477                         array( 'name' => 'interwiki', 'callback' => array( $installer, 'populateInterwikiTable' ) ),
1478                         array( 'name' => 'stats', 'callback' => array( $this, 'populateSiteStats' ) ),
1479                         array( 'name' => 'keys', 'callback' => array( $this, 'generateKeys' ) ),
1480                         array( 'name' => 'sysop', 'callback' => array( $this, 'createSysop' ) ),
1481                         array( 'name' => 'mainpage', 'callback' => array( $this, 'createMainpage' ) ),
1482                 );
1483
1484                 // Build the array of install steps starting from the core install list,
1485                 // then adding any callbacks that wanted to attach after a given step
1486                 foreach ( $coreInstallSteps as $step ) {
1487                         $this->installSteps[] = $step;
1488                         if ( isset( $this->extraInstallSteps[$step['name']] ) ) {
1489                                 $this->installSteps = array_merge(
1490                                         $this->installSteps,
1491                                         $this->extraInstallSteps[$step['name']]
1492                                 );
1493                         }
1494                 }
1495
1496                 // Prepend any steps that want to be at the beginning
1497                 if ( isset( $this->extraInstallSteps['BEGINNING'] ) ) {
1498                         $this->installSteps = array_merge(
1499                                 $this->extraInstallSteps['BEGINNING'],
1500                                 $this->installSteps
1501                         );
1502                 }
1503
1504                 // Extensions should always go first, chance to tie into hooks and such
1505                 if ( count( $this->getVar( '_Extensions' ) ) ) {
1506                         array_unshift( $this->installSteps,
1507                                 array( 'name' => 'extensions', 'callback' => array( $this, 'includeExtensions' ) )
1508                         );
1509                         $this->installSteps[] = array(
1510                                 'name' => 'extension-tables',
1511                                 'callback' => array( $installer, 'createExtensionTables' )
1512                         );
1513                 }
1514
1515                 return $this->installSteps;
1516         }
1517
1518         /**
1519          * Actually perform the installation.
1520          *
1521          * @param array $startCB A callback array for the beginning of each step
1522          * @param array $endCB A callback array for the end of each step
1523          *
1524          * @return array Array of Status objects
1525          */
1526         public function performInstallation( $startCB, $endCB ) {
1527                 $installResults = array();
1528                 $installer = $this->getDBInstaller();
1529                 $installer->preInstall();
1530                 $steps = $this->getInstallSteps( $installer );
1531                 foreach ( $steps as $stepObj ) {
1532                         $name = $stepObj['name'];
1533                         call_user_func_array( $startCB, array( $name ) );
1534
1535                         // Perform the callback step
1536                         $status = call_user_func( $stepObj['callback'], $installer );
1537
1538                         // Output and save the results
1539                         call_user_func( $endCB, $name, $status );
1540                         $installResults[$name] = $status;
1541
1542                         // If we've hit some sort of fatal, we need to bail.
1543                         // Callback already had a chance to do output above.
1544                         if ( !$status->isOk() ) {
1545                                 break;
1546                         }
1547                 }
1548                 if ( $status->isOk() ) {
1549                         $this->setVar( '_InstallDone', true );
1550                 }
1551
1552                 return $installResults;
1553         }
1554
1555         /**
1556          * Generate $wgSecretKey. Will warn if we had to use an insecure random source.
1557          *
1558          * @return Status
1559          */
1560         public function generateKeys() {
1561                 $keys = array( 'wgSecretKey' => 64 );
1562                 if ( strval( $this->getVar( 'wgUpgradeKey' ) ) === '' ) {
1563                         $keys['wgUpgradeKey'] = 16;
1564                 }
1565
1566                 return $this->doGenerateKeys( $keys );
1567         }
1568
1569         /**
1570          * Generate a secret value for variables using our CryptRand generator.
1571          * Produce a warning if the random source was insecure.
1572          *
1573          * @param array $keys
1574          * @return Status
1575          */
1576         protected function doGenerateKeys( $keys ) {
1577                 $status = Status::newGood();
1578
1579                 $strong = true;
1580                 foreach ( $keys as $name => $length ) {
1581                         $secretKey = MWCryptRand::generateHex( $length, true );
1582                         if ( !MWCryptRand::wasStrong() ) {
1583                                 $strong = false;
1584                         }
1585
1586                         $this->setVar( $name, $secretKey );
1587                 }
1588
1589                 if ( !$strong ) {
1590                         $names = array_keys( $keys );
1591                         $names = preg_replace( '/^(.*)$/', '\$$1', $names );
1592                         global $wgLang;
1593                         $status->warning( 'config-insecure-keys', $wgLang->listToText( $names ), count( $names ) );
1594                 }
1595
1596                 return $status;
1597         }
1598
1599         /**
1600          * Create the first user account, grant it sysop and bureaucrat rights
1601          *
1602          * @return Status
1603          */
1604         protected function createSysop() {
1605                 $name = $this->getVar( '_AdminName' );
1606                 $user = User::newFromName( $name );
1607
1608                 if ( !$user ) {
1609                         // We should've validated this earlier anyway!
1610                         return Status::newFatal( 'config-admin-error-user', $name );
1611                 }
1612
1613                 if ( $user->idForName() == 0 ) {
1614                         $user->addToDatabase();
1615
1616                         try {
1617                                 $user->setPassword( $this->getVar( '_AdminPassword' ) );
1618                         } catch ( PasswordError $pwe ) {
1619                                 return Status::newFatal( 'config-admin-error-password', $name, $pwe->getMessage() );
1620                         }
1621
1622                         $user->addGroup( 'sysop' );
1623                         $user->addGroup( 'bureaucrat' );
1624                         if ( $this->getVar( '_AdminEmail' ) ) {
1625                                 $user->setEmail( $this->getVar( '_AdminEmail' ) );
1626                         }
1627                         $user->saveSettings();
1628
1629                         // Update user count
1630                         $ssUpdate = new SiteStatsUpdate( 0, 0, 0, 0, 1 );
1631                         $ssUpdate->doUpdate();
1632                 }
1633                 $status = Status::newGood();
1634
1635                 if ( $this->getVar( '_Subscribe' ) && $this->getVar( '_AdminEmail' ) ) {
1636                         $this->subscribeToMediaWikiAnnounce( $status );
1637                 }
1638
1639                 return $status;
1640         }
1641
1642         /**
1643          * @param Status $s
1644          */
1645         private function subscribeToMediaWikiAnnounce( Status $s ) {
1646                 $params = array(
1647                         'email' => $this->getVar( '_AdminEmail' ),
1648                         'language' => 'en',
1649                         'digest' => 0
1650                 );
1651
1652                 // Mailman doesn't support as many languages as we do, so check to make
1653                 // sure their selected language is available
1654                 $myLang = $this->getVar( '_UserLang' );
1655                 if ( in_array( $myLang, $this->mediaWikiAnnounceLanguages ) ) {
1656                         $myLang = $myLang == 'pt-br' ? 'pt_BR' : $myLang; // rewrite to Mailman's pt_BR
1657                         $params['language'] = $myLang;
1658                 }
1659
1660                 if ( MWHttpRequest::canMakeRequests() ) {
1661                         $res = MWHttpRequest::factory( $this->mediaWikiAnnounceUrl,
1662                                 array( 'method' => 'POST', 'postData' => $params ) )->execute();
1663                         if ( !$res->isOK() ) {
1664                                 $s->warning( 'config-install-subscribe-fail', $res->getMessage() );
1665                         }
1666                 } else {
1667                         $s->warning( 'config-install-subscribe-notpossible' );
1668                 }
1669         }
1670
1671         /**
1672          * Insert Main Page with default content.
1673          *
1674          * @param DatabaseInstaller $installer
1675          * @return Status
1676          */
1677         protected function createMainpage( DatabaseInstaller $installer ) {
1678                 $status = Status::newGood();
1679                 try {
1680                         $page = WikiPage::factory( Title::newMainPage() );
1681                         $content = new WikitextContent(
1682                                 wfMessage( 'mainpagetext' )->inContentLanguage()->text() . "\n\n" .
1683                                 wfMessage( 'mainpagedocfooter' )->inContentLanguage()->text()
1684                         );
1685
1686                         $page->doEditContent( $content,
1687                                 '',
1688                                 EDIT_NEW,
1689                                 false,
1690                                 User::newFromName( 'MediaWiki default' )
1691                         );
1692                 } catch ( MWException $e ) {
1693                         //using raw, because $wgShowExceptionDetails can not be set yet
1694                         $status->fatal( 'config-install-mainpage-failed', $e->getMessage() );
1695                 }
1696
1697                 return $status;
1698         }
1699
1700         /**
1701          * Override the necessary bits of the config to run an installation.
1702          */
1703         public static function overrideConfig() {
1704                 define( 'MW_NO_SESSION', 1 );
1705
1706                 // Don't access the database
1707                 $GLOBALS['wgUseDatabaseMessages'] = false;
1708                 // Don't cache langconv tables
1709                 $GLOBALS['wgLanguageConverterCacheType'] = CACHE_NONE;
1710                 // Debug-friendly
1711                 $GLOBALS['wgShowExceptionDetails'] = true;
1712                 // Don't break forms
1713                 $GLOBALS['wgExternalLinkTarget'] = '_blank';
1714
1715                 // Extended debugging
1716                 $GLOBALS['wgShowSQLErrors'] = true;
1717                 $GLOBALS['wgShowDBErrorBacktrace'] = true;
1718
1719                 // Allow multiple ob_flush() calls
1720                 $GLOBALS['wgDisableOutputCompression'] = true;
1721
1722                 // Use a sensible cookie prefix (not my_wiki)
1723                 $GLOBALS['wgCookiePrefix'] = 'mw_installer';
1724
1725                 // Some of the environment checks make shell requests, remove limits
1726                 $GLOBALS['wgMaxShellMemory'] = 0;
1727
1728                 // Don't bother embedding images into generated CSS, which is not cached
1729                 $GLOBALS['wgResourceLoaderLESSFunctions']['embeddable'] = function ( $frame, $less ) {
1730                         return $less->toBool( false );
1731                 };
1732         }
1733
1734         /**
1735          * Add an installation step following the given step.
1736          *
1737          * @param array $callback A valid installation callback array, in this form:
1738          *    array( 'name' => 'some-unique-name', 'callback' => array( $obj, 'function' ) );
1739          * @param string $findStep The step to find. Omit to put the step at the beginning
1740          */
1741         public function addInstallStep( $callback, $findStep = 'BEGINNING' ) {
1742                 $this->extraInstallSteps[$findStep][] = $callback;
1743         }
1744
1745         /**
1746          * Disable the time limit for execution.
1747          * Some long-running pages (Install, Upgrade) will want to do this
1748          */
1749         protected function disableTimeLimit() {
1750                 wfSuppressWarnings();
1751                 set_time_limit( 0 );
1752                 wfRestoreWarnings();
1753         }
1754 }