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          * @var array
  46          */
  47         protected $settings;
  48
  49         /**
  50          * Cached DB installer instances, access using getDBInstaller().
  51          *
  52          * @var array
  53          */
  54         protected $dbInstallers = array();
  55
  56         /**
  57          * Minimum memory size in MB.
  58          *
  59          * @var integer
  60          */
  61         protected $minMemorySize = 50;
  62
  63         /**
  64          * Cached Title, used by parse().
  65          *
  66          * @var Title
  67          */
  68         protected $parserTitle;
  69
  70         /**
  71          * Cached ParserOptions, used by parse().
  72          *
  73          * @var ParserOptions
  74          */
  75         protected $parserOptions;
  76
  77         /**
  78          * Known database types. These correspond to the class names <type>Installer,
  79          * and are also MediaWiki database types valid for $wgDBtype.
  80          *
  81          * To add a new type, create a <type>Installer class and a Database<type>
  82          * class, and add a config-type-<type> message to MessagesEn.php.
  83          *
  84          * @var array
  85          */
  86         protected static $dbTypes = array(
  87                 'mysql',
  88                 'postgres',
  89                 'oracle',
  90                 'sqlite',
  91         );
  92
  93         /**
  94          * A list of environment check methods called by doEnvironmentChecks().
  95          * These may output warnings using showMessage(), and/or abort the
  96          * installation process by returning false.
  97          *
  98          * @var array
  99          */
 100         protected $envChecks = array(
 101                 'envCheckDB',
 102                 'envCheckRegisterGlobals',
 103                 'envCheckBrokenXML',
 104                 'envCheckPHP531',
 105                 'envCheckMagicQuotes',
 106                 'envCheckMagicSybase',
 107                 'envCheckMbstring',
 108                 'envCheckZE1',
 109                 'envCheckSafeMode',
 110                 'envCheckXML',
 111                 'envCheckPCRE',
 112                 'envCheckMemory',
 113                 'envCheckCache',
 114                 'envCheckModSecurity',
 115                 'envCheckDiff3',
 116                 'envCheckGraphics',
 117                 'envCheckGit',
 118                 'envCheckServer',
 119                 'envCheckPath',
 120                 'envCheckExtension',
 121                 'envCheckShellLocale',
 122                 'envCheckUploadsDirectory',
 123                 'envCheckLibicu',
 124                 'envCheckSuhosinMaxValueLength',
 125                 'envCheckCtype',
 126         );
 127
 128         /**
 129          * MediaWiki configuration globals that will eventually be passed through
 130          * to LocalSettings.php. The names only are given here, the defaults
 131          * typically come from DefaultSettings.php.
 132          *
 133          * @var array
 134          */
 135         protected $defaultVarNames = array(
 136                 'wgSitename',
 137                 'wgPasswordSender',
 138                 'wgLanguageCode',
 139                 'wgRightsIcon',
 140                 'wgRightsText',
 141                 'wgRightsUrl',
 142                 'wgMainCacheType',
 143                 'wgEnableEmail',
 144                 'wgEnableUserEmail',
 145                 'wgEnotifUserTalk',
 146                 'wgEnotifWatchlist',
 147                 'wgEmailAuthentication',
 148                 'wgDBtype',
 149                 'wgDiff3',
 150                 'wgImageMagickConvertCommand',
 151                 'wgGitBin',
 152                 'IP',
 153                 'wgServer',
 154                 'wgScriptPath',
 155                 'wgScriptExtension',
 156                 'wgMetaNamespace',
 157                 'wgDeletedDirectory',
 158                 'wgEnableUploads',
 159                 'wgLogo',
 160                 'wgShellLocale',
 161                 'wgSecretKey',
 162                 'wgUseInstantCommons',
 163                 'wgUpgradeKey',
 164                 'wgDefaultSkin',
 165                 'wgResourceLoaderMaxQueryLength',
 166         );
 167
 168         /**
 169          * Variables that are stored alongside globals, and are used for any
 170          * configuration of the installation process aside from the MediaWiki
 171          * configuration. Map of names to defaults.
 172          *
 173          * @var array
 174          */
 175         protected $internalDefaults = array(
 176                 '_UserLang' => 'en',
 177                 '_Environment' => false,
 178                 '_CompiledDBs' => array(),
 179                 '_SafeMode' => false,
 180                 '_RaiseMemory' => false,
 181                 '_UpgradeDone' => false,
 182                 '_InstallDone' => false,
 183                 '_Caches' => array(),
 184                 '_InstallPassword' => '',
 185                 '_SameAccount' => true,
 186                 '_CreateDBAccount' => false,
 187                 '_NamespaceType' => 'site-name',
 188                 '_AdminName' => '', // will be set later, when the user selects language
 189                 '_AdminPassword' => '',
 190                 '_AdminPassword2' => '',
 191                 '_AdminEmail' => '',
 192                 '_Subscribe' => false,
 193                 '_SkipOptional' => 'continue',
 194                 '_RightsProfile' => 'wiki',
 195                 '_LicenseCode' => 'none',
 196                 '_CCDone' => false,
 197                 '_Extensions' => array(),
 198                 '_MemCachedServers' => '',
 199                 '_UpgradeKeySupplied' => false,
 200                 '_ExistingDBSettings' => false,
 201         );
 202
 203         /**
 204          * The actual list of installation steps. This will be initialized by getInstallSteps()
 205          *
 206          * @var array
 207          */
 208         private $installSteps = array();
 209
 210         /**
 211          * Extra steps for installation, for things like DatabaseInstallers to modify
 212          *
 213          * @var array
 214          */
 215         protected $extraInstallSteps = array();
 216
 217         /**
 218          * Known object cache types and the functions used to test for their existence.
 219          *
 220          * @var array
 221          */
 222         protected $objectCaches = array(
 223                 'xcache' => 'xcache_get',
 224                 'apc' => 'apc_fetch',
 225                 'wincache' => 'wincache_ucache_get'
 226         );
 227
 228         /**
 229          * User rights profiles.
 230          *
 231          * @var array
 232          */
 233         public $rightsProfiles = array(
 234                 'wiki' => array(),
 235                 'no-anon' => array(
 236                         '*' => array( 'edit' => false )
 237                 ),
 238                 'fishbowl' => array(
 239                         '*' => array(
 240                                 'createaccount' => false,
 241                                 'edit' => false,
 242                         ),
 243                 ),
 244                 'private' => array(
 245                         '*' => array(
 246                                 'createaccount' => false,
 247                                 'edit' => false,
 248                                 'read' => false,
 249                         ),
 250                 ),
 251         );
 252
 253         /**
 254          * License types.
 255          *
 256          * @var array
 257          */
 258         public $licenses = array(
 259                 'cc-by' => array(
 260                         'url' => 'http://creativecommons.org/licenses/by/3.0/',
 261                         'icon' => '{$wgStylePath}/common/images/cc-by.png',
 262                 ),
 263                 'cc-by-sa' => array(
 264                         'url' => 'http://creativecommons.org/licenses/by-sa/3.0/',
 265                         'icon' => '{$wgStylePath}/common/images/cc-by-sa.png',
 266                 ),
 267                 'cc-by-nc-sa' => array(
 268                         'url' => 'http://creativecommons.org/licenses/by-nc-sa/3.0/',
 269                         'icon' => '{$wgStylePath}/common/images/cc-by-nc-sa.png',
 270                 ),
 271                 'cc-0' => array(
 272                         'url' => 'https://creativecommons.org/publicdomain/zero/1.0/',
 273                         'icon' => '{$wgStylePath}/common/images/cc-0.png',
 274                 ),
 275                 'pd' => array(
 276                         'url' => '',
 277                         'icon' => '{$wgStylePath}/common/images/public-domain.png',
 278                 ),
 279                 'gfdl' => array(
 280                         'url' => 'http://www.gnu.org/copyleft/fdl.html',
 281                         'icon' => '{$wgStylePath}/common/images/gnu-fdl.png',
 282                 ),
 283                 'none' => array(
 284                         'url' => '',
 285                         'icon' => '',
 286                         'text' => ''
 287                 ),
 288                 'cc-choose' => array(
 289                         // Details will be filled in by the selector.
 290                         'url' => '',
 291                         'icon' => '',
 292                         'text' => '',
 293                 ),
 294         );
 295
 296         /**
 297          * URL to mediawiki-announce subscription
 298          */
 299         protected $mediaWikiAnnounceUrl = 'https://lists.wikimedia.org/mailman/subscribe/mediawiki-announce';
 300
 301         /**
 302          * Supported language codes for Mailman
 303          */
 304         protected $mediaWikiAnnounceLanguages = array(
 305                 'ca', 'cs', 'da', 'de', 'en', 'es', 'et', 'eu', 'fi', 'fr', 'hr', 'hu',
 306                 'it', 'ja', 'ko', 'lt', 'nl', 'no', 'pl', 'pt', 'pt-br', 'ro', 'ru',
 307                 'sl', 'sr', 'sv', 'tr', 'uk'
 308         );
 309
 310         /**
 311          * UI interface for displaying a short message
 312          * The parameters are like parameters to wfMessage().
 313          * The messages will be in wikitext format, which will be converted to an
 314          * output format such as HTML or text before being sent to the user.
 315          * @param $msg
 316          */
 317         abstract public function showMessage( $msg /*, ... */ );
 318
 319         /**
 320          * Same as showMessage(), but for displaying errors
 321          * @param $msg
 322          */
 323         abstract public function showError( $msg /*, ... */ );
 324
 325         /**
 326          * Show a message to the installing user by using a Status object
 327          * @param $status Status
 328          */
 329         abstract public function showStatusMessage( Status $status );
 330
 331         /**
 332          * Constructor, always call this from child classes.
 333          */
 334         public function __construct() {
 335                 global $wgExtensionMessagesFiles, $wgUser;
 336
 337                 // Disable the i18n cache and LoadBalancer
 338                 Language::getLocalisationCache()->disableBackend();
 339                 LBFactory::disableBackend();
 340
 341                 // Load the installer's i18n file.
 342                 $wgExtensionMessagesFiles['MediawikiInstaller'] =
 343                         __DIR__ . '/Installer.i18n.php';
 344
 345                 // Having a user with id = 0 safeguards us from DB access via User::loadOptions().
 346                 $wgUser = User::newFromId( 0 );
 347
 348                 $this->settings = $this->internalDefaults;
 349
 350                 foreach ( $this->defaultVarNames as $var ) {
 351                         $this->settings[$var] = $GLOBALS[$var];
 352                 }
 353
 354                 $compiledDBs = array();
 355                 foreach ( self::getDBTypes() as $type ) {
 356                         $installer = $this->getDBInstaller( $type );
 357
 358                         if ( !$installer->isCompiled() ) {
 359                                 continue;
 360                         }
 361                         $compiledDBs[] = $type;
 362
 363                         $defaults = $installer->getGlobalDefaults();
 364
 365                         foreach ( $installer->getGlobalNames() as $var ) {
 366                                 if ( isset( $defaults[$var] ) ) {
 367                                         $this->settings[$var] = $defaults[$var];
 368                                 } else {
 369                                         $this->settings[$var] = $GLOBALS[$var];
 370                                 }
 371                         }
 372                 }
 373                 $this->setVar( '_CompiledDBs', $compiledDBs );
 374
 375                 $this->parserTitle = Title::newFromText( 'Installer' );
 376                 $this->parserOptions = new ParserOptions; // language will  be wrong :(
 377                 $this->parserOptions->setEditSection( false );
 378         }
 379
 380         /**
 381          * Get a list of known DB types.
 382          *
 383          * @return array
 384          */
 385         public static function getDBTypes() {
 386                 return self::$dbTypes;
 387         }
 388
 389         /**
 390          * Do initial checks of the PHP environment. Set variables according to
 391          * the observed environment.
 392          *
 393          * It's possible that this may be called under the CLI SAPI, not the SAPI
 394          * that the wiki will primarily run under. In that case, the subclass should
 395          * initialise variables such as wgScriptPath, before calling this function.
 396          *
 397          * Under the web subclass, it can already be assumed that PHP 5+ is in use
 398          * and that sessions are working.
 399          *
 400          * @return Status
 401          */
 402         public function doEnvironmentChecks() {
 403                 $phpVersion = phpversion();
 404                 if ( version_compare( $phpVersion, self::MINIMUM_PHP_VERSION, '>=' ) ) {
 405                         $this->showMessage( 'config-env-php', $phpVersion );
 406                         $good = true;
 407                 } else {
 408                         $this->showMessage( 'config-env-php-toolow', $phpVersion, self::MINIMUM_PHP_VERSION );
 409                         $good = false;
 410                 }
 411
 412                 if ( $good ) {
 413                         foreach ( $this->envChecks as $check ) {
 414                                 $status = $this->$check();
 415                                 if ( $status === false ) {
 416                                         $good = false;
 417                                 }
 418                         }
 419                 }
 420
 421                 $this->setVar( '_Environment', $good );
 422
 423                 return $good ? Status::newGood() : Status::newFatal( 'config-env-bad' );
 424         }
 425
 426         /**
 427          * Set a MW configuration variable, or internal installer configuration variable.
 428          *
 429          * @param $name String
 430          * @param $value Mixed
 431          */
 432         public function setVar( $name, $value ) {
 433                 $this->settings[$name] = $value;
 434         }
 435
 436         /**
 437          * Get an MW configuration variable, or internal installer configuration variable.
 438          * The defaults come from $GLOBALS (ultimately DefaultSettings.php).
 439          * Installer variables are typically prefixed by an underscore.
 440          *
 441          * @param $name String
 442          * @param $default Mixed
 443          *
 444          * @return mixed
 445          */
 446         public function getVar( $name, $default = null ) {
 447                 if ( !isset( $this->settings[$name] ) ) {
 448                         return $default;
 449                 } else {
 450                         return $this->settings[$name];
 451                 }
 452         }
 453
 454         /**
 455          * Get an instance of DatabaseInstaller for the specified DB type.
 456          *
 457          * @param $type Mixed: DB installer for which is needed, false to use default.
 458          *
 459          * @return DatabaseInstaller
 460          */
 461         public function getDBInstaller( $type = false ) {
 462                 if ( !$type ) {
 463                         $type = $this->getVar( 'wgDBtype' );
 464                 }
 465
 466                 $type = strtolower( $type );
 467
 468                 if ( !isset( $this->dbInstallers[$type] ) ) {
 469                         $class = ucfirst( $type ) . 'Installer';
 470                         $this->dbInstallers[$type] = new $class( $this );
 471                 }
 472
 473                 return $this->dbInstallers[$type];
 474         }
 475
 476         /**
 477          * Determine if LocalSettings.php exists. If it does, return its variables,
 478          * merged with those from AdminSettings.php, as an array.
 479          *
 480          * @return Array
 481          */
 482         public static function getExistingLocalSettings() {
 483                 global $IP;
 484
 485                 wfSuppressWarnings();
 486                 $_lsExists = file_exists( "$IP/LocalSettings.php" );
 487                 wfRestoreWarnings();
 488
 489                 if ( !$_lsExists ) {
 490                         return false;
 491                 }
 492                 unset( $_lsExists );
 493
 494                 require "$IP/includes/DefaultSettings.php";
 495                 require "$IP/LocalSettings.php";
 496                 if ( file_exists( "$IP/AdminSettings.php" ) ) {
 497                         require "$IP/AdminSettings.php";
 498                 }
 499                 return get_defined_vars();
 500         }
 501
 502         /**
 503          * Get a fake password for sending back to the user in HTML.
 504          * This is a security mechanism to avoid compromise of the password in the
 505          * event of session ID compromise.
 506          *
 507          * @param $realPassword String
 508          *
 509          * @return string
 510          */
 511         public function getFakePassword( $realPassword ) {
 512                 return str_repeat( '*', strlen( $realPassword ) );
 513         }
 514
 515         /**
 516          * Set a variable which stores a password, except if the new value is a
 517          * fake password in which case leave it as it is.
 518          *
 519          * @param $name String
 520          * @param $value Mixed
 521          */
 522         public function setPassword( $name, $value ) {
 523                 if ( !preg_match( '/^\*+$/', $value ) ) {
 524                         $this->setVar( $name, $value );
 525                 }
 526         }
 527
 528         /**
 529          * On POSIX systems return the primary group of the webserver we're running under.
 530          * On other systems just returns null.
 531          *
 532          * This is used to advice the user that he should chgrp his mw-config/data/images directory as the
 533          * webserver user before he can install.
 534          *
 535          * Public because SqliteInstaller needs it, and doesn't subclass Installer.
 536          *
 537          * @return mixed
 538          */
 539         public static function maybeGetWebserverPrimaryGroup() {
 540                 if ( !function_exists( 'posix_getegid' ) || !function_exists( 'posix_getpwuid' ) ) {
 541                         # I don't know this, this isn't UNIX.
 542                         return null;
 543                 }
 544
 545                 # posix_getegid() *not* getmygid() because we want the group of the webserver,
 546                 # not whoever owns the current script.
 547                 $gid = posix_getegid();
 548                 $getpwuid = posix_getpwuid( $gid );
 549                 $group = $getpwuid['name'];
 550
 551                 return $group;
 552         }
 553
 554         /**
 555          * Convert wikitext $text to HTML.
 556          *
 557          * This is potentially error prone since many parser features require a complete
 558          * installed MW database. The solution is to just not use those features when you
 559          * write your messages. This appears to work well enough. Basic formatting and
 560          * external links work just fine.
 561          *
 562          * But in case a translator decides to throw in a "#ifexist" or internal link or
 563          * whatever, this function is guarded to catch the attempted DB access and to present
 564          * some fallback text.
 565          *
 566          * @param $text String
 567          * @param $lineStart Boolean
 568          * @return String
 569          */
 570         public function parse( $text, $lineStart = false ) {
 571                 global $wgParser;
 572
 573                 try {
 574                         $out = $wgParser->parse( $text, $this->parserTitle, $this->parserOptions, $lineStart );
 575                         $html = $out->getText();
 576                 } catch ( DBAccessError $e ) {
 577                         $html = '<!--DB access attempted during parse-->  ' . htmlspecialchars( $text );
 578
 579                         if ( !empty( $this->debug ) ) {
 580                                 $html .= "<!--\n" . $e->getTraceAsString() . "\n-->";
 581                         }
 582                 }
 583
 584                 return $html;
 585         }
 586
 587         /**
 588          * @return ParserOptions
 589          */
 590         public function getParserOptions() {
 591                 return $this->parserOptions;
 592         }
 593
 594         public function disableLinkPopups() {
 595                 $this->parserOptions->setExternalLinkTarget( false );
 596         }
 597
 598         public function restoreLinkPopups() {
 599                 global $wgExternalLinkTarget;
 600                 $this->parserOptions->setExternalLinkTarget( $wgExternalLinkTarget );
 601         }
 602
 603         /**
 604          * Install step which adds a row to the site_stats table with appropriate
 605          * initial values.
 606          *
 607          * @param $installer DatabaseInstaller
 608          *
 609          * @return Status
 610          */
 611         public function populateSiteStats( DatabaseInstaller $installer ) {
 612                 $status = $installer->getConnection();
 613                 if ( !$status->isOK() ) {
 614                         return $status;
 615                 }
 616                 $status->value->insert( 'site_stats', array(
 617                         'ss_row_id' => 1,
 618                         'ss_total_views' => 0,
 619                         'ss_total_edits' => 0,
 620                         'ss_good_articles' => 0,
 621                         'ss_total_pages' => 0,
 622                         'ss_users' => 0,
 623                         'ss_images' => 0 ),
 624                         __METHOD__, 'IGNORE' );
 625                 return Status::newGood();
 626         }
 627
 628         /**
 629          * Exports all wg* variables stored by the installer into global scope.
 630          */
 631         public function exportVars() {
 632                 foreach ( $this->settings as $name => $value ) {
 633                         if ( substr( $name, 0, 2 ) == 'wg' ) {
 634                                 $GLOBALS[$name] = $value;
 635                         }
 636                 }
 637         }
 638
 639         /**
 640          * Environment check for DB types.
 641          * @return bool
 642          */
 643         protected function envCheckDB() {
 644                 global $wgLang;
 645
 646                 $allNames = array();
 647
 648                 // Give grep a chance to find the usages:
 649                 // config-type-mysql, config-type-postgres, config-type-oracle, config-type-sqlite
 650                 foreach ( self::getDBTypes() as $name ) {
 651                         $allNames[] = wfMessage( "config-type-$name" )->text();
 652                 }
 653
 654                 // cache initially available databases to make sure that everything will be displayed correctly
 655                 // after a refresh on env checks page
 656                 $databases = $this->getVar( '_CompiledDBs-preFilter' );
 657                 if ( !$databases ) {
 658                         $databases = $this->getVar( '_CompiledDBs' );
 659                         $this->setVar( '_CompiledDBs-preFilter', $databases );
 660                 }
 661
 662                 $databases = array_flip ( $databases );
 663                 foreach ( array_keys( $databases ) as $db ) {
 664                         $installer = $this->getDBInstaller( $db );
 665                         $status = $installer->checkPrerequisites();
 666                         if ( !$status->isGood() ) {
 667                                 $this->showStatusMessage( $status );
 668                         }
 669                         if ( !$status->isOK() ) {
 670                                 unset( $databases[$db] );
 671                         }
 672                 }
 673                 $databases = array_flip( $databases );
 674                 if ( !$databases ) {
 675                         $this->showError( 'config-no-db', $wgLang->commaList( $allNames ) );
 676                         // @todo FIXME: This only works for the web installer!
 677                         return false;
 678                 }
 679                 $this->setVar( '_CompiledDBs', $databases );
 680                 return true;
 681         }
 682
 683         /**
 684          * Environment check for register_globals.
 685          */
 686         protected function envCheckRegisterGlobals() {
 687                 if ( wfIniGetBool( 'register_globals' ) ) {
 688                         $this->showMessage( 'config-register-globals' );
 689                 }
 690         }
 691
 692         /**
 693          * Some versions of libxml+PHP break < and > encoding horribly
 694          * @return bool
 695          */
 696         protected function envCheckBrokenXML() {
 697                 $test = new PhpXmlBugTester();
 698                 if ( !$test->ok ) {
 699                         $this->showError( 'config-brokenlibxml' );
 700                         return false;
 701                 }
 702                 return true;
 703         }
 704
 705         /**
 706          * Test PHP (probably 5.3.1, but it could regress again) to make sure that
 707          * reference parameters to __call() are not converted to null
 708          * @return bool
 709          */
 710         protected function envCheckPHP531() {
 711                 $test = new PhpRefCallBugTester;
 712                 $test->execute();
 713                 if ( !$test->ok ) {
 714                         $this->showError( 'config-using531', phpversion() );
 715                         return false;
 716                 }
 717                 return true;
 718         }
 719
 720         /**
 721          * Environment check for magic_quotes_runtime.
 722          * @return bool
 723          */
 724         protected function envCheckMagicQuotes() {
 725                 if ( wfIniGetBool( "magic_quotes_runtime" ) ) {
 726                         $this->showError( 'config-magic-quotes-runtime' );
 727                         return false;
 728                 }
 729                 return true;
 730         }
 731
 732         /**
 733          * Environment check for magic_quotes_sybase.
 734          * @return bool
 735          */
 736         protected function envCheckMagicSybase() {
 737                 if ( wfIniGetBool( 'magic_quotes_sybase' ) ) {
 738                         $this->showError( 'config-magic-quotes-sybase' );
 739                         return false;
 740                 }
 741                 return true;
 742         }
 743
 744         /**
 745          * Environment check for mbstring.func_overload.
 746          * @return bool
 747          */
 748         protected function envCheckMbstring() {
 749                 if ( wfIniGetBool( 'mbstring.func_overload' ) ) {
 750                         $this->showError( 'config-mbstring' );
 751                         return false;
 752                 }
 753                 return true;
 754         }
 755
 756         /**
 757          * Environment check for zend.ze1_compatibility_mode.
 758          * @return bool
 759          */
 760         protected function envCheckZE1() {
 761                 if ( wfIniGetBool( 'zend.ze1_compatibility_mode' ) ) {
 762                         $this->showError( 'config-ze1' );
 763                         return false;
 764                 }
 765                 return true;
 766         }
 767
 768         /**
 769          * Environment check for safe_mode.
 770          * @return bool
 771          */
 772         protected function envCheckSafeMode() {
 773                 if ( wfIniGetBool( 'safe_mode' ) ) {
 774                         $this->setVar( '_SafeMode', true );
 775                         $this->showMessage( 'config-safe-mode' );
 776                 }
 777                 return true;
 778         }
 779
 780         /**
 781          * Environment check for the XML module.
 782          * @return bool
 783          */
 784         protected function envCheckXML() {
 785                 if ( !function_exists( "utf8_encode" ) ) {
 786                         $this->showError( 'config-xml-bad' );
 787                         return false;
 788                 }
 789                 return true;
 790         }
 791
 792         /**
 793          * Environment check for the PCRE module.
 794          *
 795          * @note If this check were to fail, the parser would
 796          *   probably throw an exception before the result
 797          *   of this check is shown to the user.
 798          * @return bool
 799          */
 800         protected function envCheckPCRE() {
 801                 if ( !function_exists( 'preg_match' ) ) {
 802                         $this->showError( 'config-pcre' );
 803                         return false;
 804                 }
 805                 wfSuppressWarnings();
 806                 $regexd = preg_replace( '/[\x{0430}-\x{04FF}]/iu', '', '-АБВГД-' );
 807                 // Need to check for \p support too, as PCRE can be compiled
 808                 // with utf8 support, but not unicode property support.
 809                 // check that \p{Zs} (space separators) matches
 810                 // U+3000 (Ideographic space)
 811                 $regexprop = preg_replace( '/\p{Zs}/u', '', "-\xE3\x80\x80-" );
 812                 wfRestoreWarnings();
 813                 if ( $regexd != '--' || $regexprop != '--' ) {
 814                         $this->showError( 'config-pcre-no-utf8' );
 815                         return false;
 816                 }
 817                 return true;
 818         }
 819
 820         /**
 821          * Environment check for available memory.
 822          * @return bool
 823          */
 824         protected function envCheckMemory() {
 825                 $limit = ini_get( 'memory_limit' );
 826
 827                 if ( !$limit || $limit == -1 ) {
 828                         return true;
 829                 }
 830
 831                 $n = wfShorthandToInteger( $limit );
 832
 833                 if ( $n < $this->minMemorySize * 1024 * 1024 ) {
 834                         $newLimit = "{$this->minMemorySize}M";
 835
 836                         if ( ini_set( "memory_limit", $newLimit ) === false ) {
 837                                 $this->showMessage( 'config-memory-bad', $limit );
 838                         } else {
 839                                 $this->showMessage( 'config-memory-raised', $limit, $newLimit );
 840                                 $this->setVar( '_RaiseMemory', true );
 841                         }
 842                 }
 843                 return true;
 844         }
 845
 846         /**
 847          * Environment check for compiled object cache types.
 848          */
 849         protected function envCheckCache() {
 850                 $caches = array();
 851                 foreach ( $this->objectCaches as $name => $function ) {
 852                         if ( function_exists( $function ) ) {
 853                                 if ( $name == 'xcache' && !wfIniGetBool( 'xcache.var_size' ) ) {
 854                                         continue;
 855                                 }
 856                                 $caches[$name] = true;
 857                         }
 858                 }
 859
 860                 if ( !$caches ) {
 861                         $this->showMessage( 'config-no-cache' );
 862                 }
 863
 864                 $this->setVar( '_Caches', $caches );
 865         }
 866
 867         /**
 868          * Scare user to death if they have mod_security
 869          * @return bool
 870          */
 871         protected function envCheckModSecurity() {
 872                 if ( self::apacheModulePresent( 'mod_security' ) ) {
 873                         $this->showMessage( 'config-mod-security' );
 874                 }
 875                 return true;
 876         }
 877
 878         /**
 879          * Search for GNU diff3.
 880          * @return bool
 881          */
 882         protected function envCheckDiff3() {
 883                 $names = array( "gdiff3", "diff3", "diff3.exe" );
 884                 $versionInfo = array( '$1 --version 2>&1', 'GNU diffutils' );
 885
 886                 $diff3 = self::locateExecutableInDefaultPaths( $names, $versionInfo );
 887
 888                 if ( $diff3 ) {
 889                         $this->setVar( 'wgDiff3', $diff3 );
 890                 } else {
 891                         $this->setVar( 'wgDiff3', false );
 892                         $this->showMessage( 'config-diff3-bad' );
 893                 }
 894                 return true;
 895         }
 896
 897         /**
 898          * Environment check for ImageMagick and GD.
 899          * @return bool
 900          */
 901         protected function envCheckGraphics() {
 902                 $names = array( wfIsWindows() ? 'convert.exe' : 'convert' );
 903                 $versionInfo = array( '$1 -version', 'ImageMagick' );
 904                 $convert = self::locateExecutableInDefaultPaths( $names, $versionInfo );
 905
 906                 $this->setVar( 'wgImageMagickConvertCommand', '' );
 907                 if ( $convert ) {
 908                         $this->setVar( 'wgImageMagickConvertCommand', $convert );
 909                         $this->showMessage( 'config-imagemagick', $convert );
 910                         return true;
 911                 } elseif ( function_exists( 'imagejpeg' ) ) {
 912                         $this->showMessage( 'config-gd' );
 913
 914                 } else {
 915                         $this->showMessage( 'config-no-scaling' );
 916                 }
 917                 return true;
 918         }
 919
 920         /**
 921          * Search for git.
 922          *
 923          * @since 1.22
 924          * @return bool
 925          */
 926         protected function envCheckGit() {
 927                 $names = array( wfIsWindows() ? 'git.exe' : 'git' );
 928                 $versionInfo = array( '$1 --version', 'git version' );
 929
 930                 $git = self::locateExecutableInDefaultPaths( $names, $versionInfo );
 931
 932                 if ( $git ) {
 933                         $this->setVar( 'wgGitBin', $git );
 934                         $this->showMessage( 'config-git', $git );
 935                 } else {
 936                         $this->setVar( 'wgGitBin', false );
 937                         $this->showMessage( 'config-git-bad' );
 938                 }
 939                 return true;
 940         }
 941
 942         /**
 943          * Environment check for the server hostname.
 944          */
 945         protected function envCheckServer() {
 946                 $server = $this->envGetDefaultServer();
 947                 $this->showMessage( 'config-using-server', $server );
 948                 $this->setVar( 'wgServer', $server );
 949                 return true;
 950         }
 951
 952         /**
 953          * Helper function to be called from envCheckServer()
 954          * @return String
 955          */
 956         abstract protected function envGetDefaultServer();
 957
 958         /**
 959          * Environment check for setting $IP and $wgScriptPath.
 960          * @return bool
 961          */
 962         protected function envCheckPath() {
 963                 global $IP;
 964                 $IP = dirname( dirname( __DIR__ ) );
 965                 $this->setVar( 'IP', $IP );
 966
 967                 $this->showMessage( 'config-using-uri', $this->getVar( 'wgServer' ), $this->getVar( 'wgScriptPath' ) );
 968                 return true;
 969         }
 970
 971         /**
 972          * Environment check for setting the preferred PHP file extension.
 973          * @return bool
 974          */
 975         protected function envCheckExtension() {
 976                 // @todo FIXME: Detect this properly
 977                 if ( defined( 'MW_INSTALL_PHP5_EXT' ) ) {
 978                         $ext = 'php5';
 979                 } else {
 980                         $ext = 'php';
 981                 }
 982                 $this->setVar( 'wgScriptExtension', ".$ext" );
 983                 return true;
 984         }
 985
 986         /**
 987          * Environment check for preferred locale in shell
 988          * @return bool
 989          */
 990         protected function envCheckShellLocale() {
 991                 $os = php_uname( 's' );
 992                 $supported = array( 'Linux', 'SunOS', 'HP-UX', 'Darwin' ); # Tested these
 993
 994                 if ( !in_array( $os, $supported ) ) {
 995                         return true;
 996                 }
 997
 998                 # Get a list of available locales.
 999                 $ret = false;
1000                 $lines = wfShellExec( '/usr/bin/locale -a', $ret );
1001
1002                 if ( $ret ) {
1003                         return true;
1004                 }
1005
1006                 $lines = array_map( 'trim', explode( "\n", $lines ) );
1007                 $candidatesByLocale = array();
1008                 $candidatesByLang = array();
1009
1010                 foreach ( $lines as $line ) {
1011                         if ( $line === '' ) {
1012                                 continue;
1013                         }
1014
1015                         if ( !preg_match( '/^([a-zA-Z]+)(_[a-zA-Z]+|)\.(utf8|UTF-8)(@[a-zA-Z_]*|)$/i', $line, $m ) ) {
1016                                 continue;
1017                         }
1018
1019                         list( , $lang, , , ) = $m;
1020
1021                         $candidatesByLocale[$m[0]] = $m;
1022                         $candidatesByLang[$lang][] = $m;
1023                 }
1024
1025                 # Try the current value of LANG.
1026                 if ( isset( $candidatesByLocale[getenv( 'LANG' )] ) ) {
1027                         $this->setVar( 'wgShellLocale', getenv( 'LANG' ) );
1028                         return true;
1029                 }
1030
1031                 # Try the most common ones.
1032                 $commonLocales = array( 'en_US.UTF-8', 'en_US.utf8', 'de_DE.UTF-8', 'de_DE.utf8' );
1033                 foreach ( $commonLocales as $commonLocale ) {
1034                         if ( isset( $candidatesByLocale[$commonLocale] ) ) {
1035                                 $this->setVar( 'wgShellLocale', $commonLocale );
1036                                 return true;
1037                         }
1038                 }
1039
1040                 # Is there an available locale in the Wiki's language?
1041                 $wikiLang = $this->getVar( 'wgLanguageCode' );
1042
1043                 if ( isset( $candidatesByLang[$wikiLang] ) ) {
1044                         $m = reset( $candidatesByLang[$wikiLang] );
1045                         $this->setVar( 'wgShellLocale', $m[0] );
1046                         return true;
1047                 }
1048
1049                 # Are there any at all?
1050                 if ( count( $candidatesByLocale ) ) {
1051                         $m = reset( $candidatesByLocale );
1052                         $this->setVar( 'wgShellLocale', $m[0] );
1053                         return true;
1054                 }
1055
1056                 # Give up.
1057                 return true;
1058         }
1059
1060         /**
1061          * Environment check for the permissions of the uploads directory
1062          * @return bool
1063          */
1064         protected function envCheckUploadsDirectory() {
1065                 global $IP;
1066
1067                 $dir = $IP . '/images/';
1068                 $url = $this->getVar( 'wgServer' ) . $this->getVar( 'wgScriptPath' ) . '/images/';
1069                 $safe = !$this->dirIsExecutable( $dir, $url );
1070
1071                 if ( !$safe ) {
1072                         $this->showMessage( 'config-uploads-not-safe', $dir );
1073                 }
1074                 return true;
1075         }
1076
1077         /**
1078          * Checks if suhosin.get.max_value_length is set, and if so generate
1079          * a warning because it decreases ResourceLoader performance.
1080          * @return bool
1081          */
1082         protected function envCheckSuhosinMaxValueLength() {
1083                 $maxValueLength = ini_get( 'suhosin.get.max_value_length' );
1084                 if ( $maxValueLength > 0 &&  $maxValueLength < 1024 ) {
1085                         // Only warn if the value is below the sane 1024
1086                         $this->showMessage( 'config-suhosin-max-value-length', $maxValueLength );
1087                 }
1088                 return true;
1089         }
1090
1091         /**
1092          * Convert a hex string representing a Unicode code point to that code point.
1093          * @param $c String
1094          * @return string
1095          */
1096         protected function unicodeChar( $c ) {
1097                 $c = hexdec( $c );
1098                 if ( $c <= 0x7F ) {
1099                         return chr( $c );
1100                 } elseif ( $c <= 0x7FF ) {
1101                         return chr( 0xC0 | $c >> 6 ) . chr( 0x80 | $c & 0x3F );
1102                 } elseif ( $c <= 0xFFFF ) {
1103                         return chr( 0xE0 | $c >> 12 ) . chr( 0x80 | $c >> 6 & 0x3F )
1104                                 . chr( 0x80 | $c & 0x3F );
1105                 } elseif ( $c <= 0x10FFFF ) {
1106                         return chr( 0xF0 | $c >> 18 ) . chr( 0x80 | $c >> 12 & 0x3F )
1107                                 . chr( 0x80 | $c >> 6 & 0x3F )
1108                                 . chr( 0x80 | $c & 0x3F );
1109                 } else {
1110                         return false;
1111                 }
1112         }
1113
1114         /**
1115          * Check the libicu version
1116          */
1117         protected function envCheckLibicu() {
1118                 $utf8 = function_exists( 'utf8_normalize' );
1119                 $intl = function_exists( 'normalizer_normalize' );
1120
1121                 /**
1122                  * This needs to be updated something that the latest libicu
1123                  * will properly normalize.  This normalization was found at
1124                  * http://www.unicode.org/versions/Unicode5.2.0/#Character_Additions
1125                  * Note that we use the hex representation to create the code
1126                  * points in order to avoid any Unicode-destroying during transit.
1127                  */
1128                 $not_normal_c = $this->unicodeChar( "FA6C" );
1129                 $normal_c = $this->unicodeChar( "242EE" );
1130
1131                 $useNormalizer = 'php';
1132                 $needsUpdate = false;
1133
1134                 /**
1135                  * We're going to prefer the pecl extension here unless
1136                  * utf8_normalize is more up to date.
1137                  */
1138                 if ( $utf8 ) {
1139                         $useNormalizer = 'utf8';
1140                         $utf8 = utf8_normalize( $not_normal_c, UtfNormal::UNORM_NFC );
1141                         if ( $utf8 !== $normal_c ) {
1142                                 $needsUpdate = true;
1143                         }
1144                 }
1145                 if ( $intl ) {
1146                         $useNormalizer = 'intl';
1147                         $intl = normalizer_normalize( $not_normal_c, Normalizer::FORM_C );
1148                         if ( $intl !== $normal_c ) {
1149                                 $needsUpdate = true;
1150                         }
1151                 }
1152
1153                 // Uses messages 'config-unicode-using-php', 'config-unicode-using-utf8', 'config-unicode-using-intl'
1154                 if ( $useNormalizer === 'php' ) {
1155                         $this->showMessage( 'config-unicode-pure-php-warning' );
1156                 } else {
1157                         $this->showMessage( 'config-unicode-using-' . $useNormalizer );
1158                         if ( $needsUpdate ) {
1159                                 $this->showMessage( 'config-unicode-update-warning' );
1160                         }
1161                 }
1162         }
1163
1164         /**
1165          * @return bool
1166          */
1167         protected function envCheckCtype() {
1168                 if ( !function_exists( 'ctype_digit' ) ) {
1169                         $this->showError( 'config-ctype' );
1170                         return false;
1171                 }
1172                 return true;
1173         }
1174
1175         /**
1176          * Get an array of likely places we can find executables. Check a bunch
1177          * of known Unix-like defaults, as well as the PATH environment variable
1178          * (which should maybe make it work for Windows?)
1179          *
1180          * @return Array
1181          */
1182         protected static function getPossibleBinPaths() {
1183                 return array_merge(
1184                         array( '/usr/bin', '/usr/local/bin', '/opt/csw/bin',
1185                                 '/usr/gnu/bin', '/usr/sfw/bin', '/sw/bin', '/opt/local/bin' ),
1186                         explode( PATH_SEPARATOR, getenv( 'PATH' ) )
1187                 );
1188         }
1189
1190         /**
1191          * Search a path for any of the given executable names. Returns the
1192          * executable name if found. Also checks the version string returned
1193          * by each executable.
1194          *
1195          * Used only by environment checks.
1196          *
1197          * @param string $path path to search
1198          * @param array $names of executable names
1199          * @param $versionInfo Boolean false or array with two members:
1200          *               0 => Command to run for version check, with $1 for the full executable name
1201          *               1 => String to compare the output with
1202          *
1203          * If $versionInfo is not false, only executables with a version
1204          * matching $versionInfo[1] will be returned.
1205          * @return bool|string
1206          */
1207         public static function locateExecutable( $path, $names, $versionInfo = false ) {
1208                 if ( !is_array( $names ) ) {
1209                         $names = array( $names );
1210                 }
1211
1212                 foreach ( $names as $name ) {
1213                         $command = $path . DIRECTORY_SEPARATOR . $name;
1214
1215                         wfSuppressWarnings();
1216                         $file_exists = file_exists( $command );
1217                         wfRestoreWarnings();
1218
1219                         if ( $file_exists ) {
1220                                 if ( !$versionInfo ) {
1221                                         return $command;
1222                                 }
1223
1224                                 $file = str_replace( '$1', wfEscapeShellArg( $command ), $versionInfo[0] );
1225                                 if ( strstr( wfShellExec( $file ), $versionInfo[1] ) !== false ) {
1226                                         return $command;
1227                                 }
1228                         }
1229                 }
1230                 return false;
1231         }
1232
1233         /**
1234          * Same as locateExecutable(), but checks in getPossibleBinPaths() by default
1235          * @see locateExecutable()
1236          * @param $names
1237          * @param $versionInfo bool
1238          * @return bool|string
1239          */
1240         public static function locateExecutableInDefaultPaths( $names, $versionInfo = false ) {
1241                 foreach ( self::getPossibleBinPaths() as $path ) {
1242                         $exe = self::locateExecutable( $path, $names, $versionInfo );
1243                         if ( $exe !== false ) {
1244                                 return $exe;
1245                         }
1246                 }
1247                 return false;
1248         }
1249
1250         /**
1251          * Checks if scripts located in the given directory can be executed via the given URL.
1252          *
1253          * Used only by environment checks.
1254          * @param $dir string
1255          * @param $url string
1256          * @return bool|int|string
1257          */
1258         public function dirIsExecutable( $dir, $url ) {
1259                 $scriptTypes = array(
1260                         'php' => array(
1261                                 "<?php echo 'ex' . 'ec';",
1262                                 "#!/var/env php5\n<?php echo 'ex' . 'ec';",
1263                         ),
1264                 );
1265
1266                 // it would be good to check other popular languages here, but it'll be slow.
1267
1268                 wfSuppressWarnings();
1269
1270                 foreach ( $scriptTypes as $ext => $contents ) {
1271                         foreach ( $contents as $source ) {
1272                                 $file = 'exectest.' . $ext;
1273
1274                                 if ( !file_put_contents( $dir . $file, $source ) ) {
1275                                         break;
1276                                 }
1277
1278                                 try {
1279                                         $text = Http::get( $url . $file, array( 'timeout' => 3 ) );
1280                                 }
1281                                 catch ( MWException $e ) {
1282                                         // Http::get throws with allow_url_fopen = false and no curl extension.
1283                                         $text = null;
1284                                 }
1285                                 unlink( $dir . $file );
1286
1287                                 if ( $text == 'exec' ) {
1288                                         wfRestoreWarnings();
1289                                         return $ext;
1290                                 }
1291                         }
1292                 }
1293
1294                 wfRestoreWarnings();
1295
1296                 return false;
1297         }
1298
1299         /**
1300          * Checks for presence of an Apache module. Works only if PHP is running as an Apache module, too.
1301          *
1302          * @param string $moduleName Name of module to check.
1303          * @return bool
1304          */
1305         public static function apacheModulePresent( $moduleName ) {
1306                 if ( function_exists( 'apache_get_modules' ) && in_array( $moduleName, apache_get_modules() ) ) {
1307                         return true;
1308                 }
1309                 // try it the hard way
1310                 ob_start();
1311                 phpinfo( INFO_MODULES );
1312                 $info = ob_get_clean();
1313                 return strpos( $info, $moduleName ) !== false;
1314         }
1315
1316         /**
1317          * ParserOptions are constructed before we determined the language, so fix it
1318          *
1319          * @param $lang Language
1320          */
1321         public function setParserLanguage( $lang ) {
1322                 $this->parserOptions->setTargetLanguage( $lang );
1323                 $this->parserOptions->setUserLang( $lang );
1324         }
1325
1326         /**
1327          * Overridden by WebInstaller to provide lastPage parameters.
1328          * @param $page string
1329          * @return string
1330          */
1331         protected function getDocUrl( $page ) {
1332                 return "{$_SERVER['PHP_SELF']}?page=" . urlencode( $page );
1333         }
1334
1335         /**
1336          * Finds extensions that follow the format /extensions/Name/Name.php,
1337          * and returns an array containing the value for 'Name' for each found extension.
1338          *
1339          * @return array
1340          */
1341         public function findExtensions() {
1342                 if ( $this->getVar( 'IP' ) === null ) {
1343                         return array();
1344                 }
1345
1346                 $extDir = $this->getVar( 'IP' ) . '/extensions';
1347                 if ( !is_readable( $extDir ) || !is_dir( $extDir ) ) {
1348                         return array();
1349                 }
1350
1351                 $dh = opendir( $extDir );
1352                 $exts = array();
1353                 while ( ( $file = readdir( $dh ) ) !== false ) {
1354                         if ( !is_dir( "$extDir/$file" ) ) {
1355                                 continue;
1356                         }
1357                         if ( file_exists( "$extDir/$file/$file.php" ) ) {
1358                                 $exts[] = $file;
1359                         }
1360                 }
1361                 closedir( $dh );
1362                 natcasesort( $exts );
1363
1364                 return $exts;
1365         }
1366
1367         /**
1368          * Installs the auto-detected extensions.
1369          *
1370          * @return Status
1371          */
1372         protected function includeExtensions() {
1373                 global $IP;
1374                 $exts = $this->getVar( '_Extensions' );
1375                 $IP = $this->getVar( 'IP' );
1376
1377                 /**
1378                  * We need to include DefaultSettings before including extensions to avoid
1379                  * warnings about unset variables. However, the only thing we really
1380                  * want here is $wgHooks['LoadExtensionSchemaUpdates']. This won't work
1381                  * if the extension has hidden hook registration in $wgExtensionFunctions,
1382                  * but we're not opening that can of worms
1383                  * @see https://bugzilla.wikimedia.org/show_bug.cgi?id=26857
1384                  */
1385                 global $wgAutoloadClasses;
1386                 $wgAutoloadClasses = array();
1387
1388                 require "$IP/includes/DefaultSettings.php";
1389
1390                 foreach ( $exts as $e ) {
1391                         require_once "$IP/extensions/$e/$e.php";
1392                 }
1393
1394                 $hooksWeWant = isset( $wgHooks['LoadExtensionSchemaUpdates'] ) ?
1395                         $wgHooks['LoadExtensionSchemaUpdates'] : array();
1396
1397                 // Unset everyone else's hooks. Lord knows what someone might be doing
1398                 // in ParserFirstCallInit (see bug 27171)
1399                 $GLOBALS['wgHooks'] = array( 'LoadExtensionSchemaUpdates' => $hooksWeWant );
1400
1401                 return Status::newGood();
1402         }
1403
1404         /**
1405          * Get an array of install steps. Should always be in the format of
1406          * array(
1407          *   'name'     => 'someuniquename',
1408          *   'callback' => array( $obj, 'method' ),
1409          * )
1410          * There must be a config-install-$name message defined per step, which will
1411          * be shown on install.
1412          *
1413          * @param $installer DatabaseInstaller so we can make callbacks
1414          * @return array
1415          */
1416         protected function getInstallSteps( DatabaseInstaller $installer ) {
1417                 $coreInstallSteps = array(
1418                         array( 'name' => 'database',   'callback' => array( $installer, 'setupDatabase' ) ),
1419                         array( 'name' => 'tables',     'callback' => array( $installer, 'createTables' ) ),
1420                         array( 'name' => 'interwiki',  'callback' => array( $installer, 'populateInterwikiTable' ) ),
1421                         array( 'name' => 'stats',      'callback' => array( $this, 'populateSiteStats' ) ),
1422                         array( 'name' => 'keys',       'callback' => array( $this, 'generateKeys' ) ),
1423                         array( 'name' => 'sysop',      'callback' => array( $this, 'createSysop' ) ),
1424                         array( 'name' => 'mainpage',   'callback' => array( $this, 'createMainpage' ) ),
1425                 );
1426
1427                 // Build the array of install steps starting from the core install list,
1428                 // then adding any callbacks that wanted to attach after a given step
1429                 foreach ( $coreInstallSteps as $step ) {
1430                         $this->installSteps[] = $step;
1431                         if ( isset( $this->extraInstallSteps[$step['name']] ) ) {
1432                                 $this->installSteps = array_merge(
1433                                         $this->installSteps,
1434                                         $this->extraInstallSteps[$step['name']]
1435                                 );
1436                         }
1437                 }
1438
1439                 // Prepend any steps that want to be at the beginning
1440                 if ( isset( $this->extraInstallSteps['BEGINNING'] ) ) {
1441                         $this->installSteps = array_merge(
1442                                 $this->extraInstallSteps['BEGINNING'],
1443                                 $this->installSteps
1444                         );
1445                 }
1446
1447                 // Extensions should always go first, chance to tie into hooks and such
1448                 if ( count( $this->getVar( '_Extensions' ) ) ) {
1449                         array_unshift( $this->installSteps,
1450                                 array( 'name' => 'extensions', 'callback' => array( $this, 'includeExtensions' ) )
1451                         );
1452                         $this->installSteps[] = array(
1453                                 'name' => 'extension-tables',
1454                                 'callback' => array( $installer, 'createExtensionTables' )
1455                         );
1456                 }
1457                 return $this->installSteps;
1458         }
1459
1460         /**
1461          * Actually perform the installation.
1462          *
1463          * @param array $startCB A callback array for the beginning of each step
1464          * @param array $endCB A callback array for the end of each step
1465          *
1466          * @return Array of Status objects
1467          */
1468         public function performInstallation( $startCB, $endCB ) {
1469                 $installResults = array();
1470                 $installer = $this->getDBInstaller();
1471                 $installer->preInstall();
1472                 $steps = $this->getInstallSteps( $installer );
1473                 foreach ( $steps as $stepObj ) {
1474                         $name = $stepObj['name'];
1475                         call_user_func_array( $startCB, array( $name ) );
1476
1477                         // Perform the callback step
1478                         $status = call_user_func( $stepObj['callback'], $installer );
1479
1480                         // Output and save the results
1481                         call_user_func( $endCB, $name, $status );
1482                         $installResults[$name] = $status;
1483
1484                         // If we've hit some sort of fatal, we need to bail.
1485                         // Callback already had a chance to do output above.
1486                         if ( !$status->isOk() ) {
1487                                 break;
1488                         }
1489                 }
1490                 if ( $status->isOk() ) {
1491                         $this->setVar( '_InstallDone', true );
1492                 }
1493                 return $installResults;
1494         }
1495
1496         /**
1497          * Generate $wgSecretKey. Will warn if we had to use an insecure random source.
1498          *
1499          * @return Status
1500          */
1501         public function generateKeys() {
1502                 $keys = array( 'wgSecretKey' => 64 );
1503                 if ( strval( $this->getVar( 'wgUpgradeKey' ) ) === '' ) {
1504                         $keys['wgUpgradeKey'] = 16;
1505                 }
1506                 return $this->doGenerateKeys( $keys );
1507         }
1508
1509         /**
1510          * Generate a secret value for variables using our CryptRand generator.
1511          * Produce a warning if the random source was insecure.
1512          *
1513          * @param $keys Array
1514          * @return Status
1515          */
1516         protected function doGenerateKeys( $keys ) {
1517                 $status = Status::newGood();
1518
1519                 $strong = true;
1520                 foreach ( $keys as $name => $length ) {
1521                         $secretKey = MWCryptRand::generateHex( $length, true );
1522                         if ( !MWCryptRand::wasStrong() ) {
1523                                 $strong = false;
1524                         }
1525
1526                         $this->setVar( $name, $secretKey );
1527                 }
1528
1529                 if ( !$strong ) {
1530                         $names = array_keys( $keys );
1531                         $names = preg_replace( '/^(.*)$/', '\$$1', $names );
1532                         global $wgLang;
1533                         $status->warning( 'config-insecure-keys', $wgLang->listToText( $names ), count( $names ) );
1534                 }
1535
1536                 return $status;
1537         }
1538
1539         /**
1540          * Create the first user account, grant it sysop and bureaucrat rights
1541          *
1542          * @return Status
1543          */
1544         protected function createSysop() {
1545                 $name = $this->getVar( '_AdminName' );
1546                 $user = User::newFromName( $name );
1547
1548                 if ( !$user ) {
1549                         // We should've validated this earlier anyway!
1550                         return Status::newFatal( 'config-admin-error-user', $name );
1551                 }
1552
1553                 if ( $user->idForName() == 0 ) {
1554                         $user->addToDatabase();
1555
1556                         try {
1557                                 $user->setPassword( $this->getVar( '_AdminPassword' ) );
1558                         } catch ( PasswordError $pwe ) {
1559                                 return Status::newFatal( 'config-admin-error-password', $name, $pwe->getMessage() );
1560                         }
1561
1562                         $user->addGroup( 'sysop' );
1563                         $user->addGroup( 'bureaucrat' );
1564                         if ( $this->getVar( '_AdminEmail' ) ) {
1565                                 $user->setEmail( $this->getVar( '_AdminEmail' ) );
1566                         }
1567                         $user->saveSettings();
1568
1569                         // Update user count
1570                         $ssUpdate = new SiteStatsUpdate( 0, 0, 0, 0, 1 );
1571                         $ssUpdate->doUpdate();
1572                 }
1573                 $status = Status::newGood();
1574
1575                 if ( $this->getVar( '_Subscribe' ) && $this->getVar( '_AdminEmail' ) ) {
1576                         $this->subscribeToMediaWikiAnnounce( $status );
1577                 }
1578
1579                 return $status;
1580         }
1581
1582         /**
1583          * @param $s Status
1584          */
1585         private function subscribeToMediaWikiAnnounce( Status $s ) {
1586                 $params = array(
1587                         'email' => $this->getVar( '_AdminEmail' ),
1588                         'language' => 'en',
1589                         'digest' => 0
1590                 );
1591
1592                 // Mailman doesn't support as many languages as we do, so check to make
1593                 // sure their selected language is available
1594                 $myLang = $this->getVar( '_UserLang' );
1595                 if ( in_array( $myLang, $this->mediaWikiAnnounceLanguages ) ) {
1596                         $myLang = $myLang == 'pt-br' ? 'pt_BR' : $myLang; // rewrite to Mailman's pt_BR
1597                         $params['language'] = $myLang;
1598                 }
1599
1600                 if ( MWHttpRequest::canMakeRequests() ) {
1601                         $res = MWHttpRequest::factory( $this->mediaWikiAnnounceUrl,
1602                                 array( 'method' => 'POST', 'postData' => $params ) )->execute();
1603                         if ( !$res->isOK() ) {
1604                                 $s->warning( 'config-install-subscribe-fail', $res->getMessage() );
1605                         }
1606                 } else {
1607                         $s->warning( 'config-install-subscribe-notpossible' );
1608                 }
1609         }
1610
1611         /**
1612          * Insert Main Page with default content.
1613          *
1614          * @param $installer DatabaseInstaller
1615          * @return Status
1616          */
1617         protected function createMainpage( DatabaseInstaller $installer ) {
1618                 $status = Status::newGood();
1619                 try {
1620                         $page = WikiPage::factory( Title::newMainPage() );
1621                         $content = new WikitextContent(
1622                                 wfMessage( 'mainpagetext' )->inContentLanguage()->text() . "\n\n" .
1623                                 wfMessage( 'mainpagedocfooter' )->inContentLanguage()->text()
1624                         );
1625
1626                         $page->doEditContent( $content,
1627                                         '',
1628                                         EDIT_NEW,
1629                                         false,
1630                                         User::newFromName( 'MediaWiki default' ) );
1631                 } catch ( MWException $e ) {
1632                         //using raw, because $wgShowExceptionDetails can not be set yet
1633                         $status->fatal( 'config-install-mainpage-failed', $e->getMessage() );
1634                 }
1635
1636                 return $status;
1637         }
1638
1639         /**
1640          * Override the necessary bits of the config to run an installation.
1641          */
1642         public static function overrideConfig() {
1643                 define( 'MW_NO_SESSION', 1 );
1644
1645                 // Don't access the database
1646                 $GLOBALS['wgUseDatabaseMessages'] = false;
1647                 // Don't cache langconv tables
1648                 $GLOBALS['wgLanguageConverterCacheType'] = CACHE_NONE;
1649                 // Debug-friendly
1650                 $GLOBALS['wgShowExceptionDetails'] = true;
1651                 // Don't break forms
1652                 $GLOBALS['wgExternalLinkTarget'] = '_blank';
1653
1654                 // Extended debugging
1655                 $GLOBALS['wgShowSQLErrors'] = true;
1656                 $GLOBALS['wgShowDBErrorBacktrace'] = true;
1657
1658                 // Allow multiple ob_flush() calls
1659                 $GLOBALS['wgDisableOutputCompression'] = true;
1660
1661                 // Use a sensible cookie prefix (not my_wiki)
1662                 $GLOBALS['wgCookiePrefix'] = 'mw_installer';
1663
1664                 // Some of the environment checks make shell requests, remove limits
1665                 $GLOBALS['wgMaxShellMemory'] = 0;
1666         }
1667
1668         /**
1669          * Add an installation step following the given step.
1670          *
1671          * @param array $callback A valid installation callback array, in this form:
1672          *    array( 'name' => 'some-unique-name', 'callback' => array( $obj, 'function' ) );
1673          * @param string $findStep the step to find. Omit to put the step at the beginning
1674          */
1675         public function addInstallStep( $callback, $findStep = 'BEGINNING' ) {
1676                 $this->extraInstallSteps[$findStep][] = $callback;
1677         }
1678
1679         /**
1680          * Disable the time limit for execution.
1681          * Some long-running pages (Install, Upgrade) will want to do this
1682          */
1683         protected function disableTimeLimit() {
1684                 wfSuppressWarnings();
1685                 set_time_limit( 0 );
1686                 wfRestoreWarnings();
1687         }
1688 }