includes/installer/Installer.php

   1 <?php
   2 /**
   3  * Base code for MediaWiki installer.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  * http://www.gnu.org/copyleft/gpl.html
  19  *
  20  * @file
  21  * @ingroup Deployment
  22  */
  23
  24 /**
  25  * This documentation group collects source code files with deployment functionality.
  26  *
  27  * @defgroup Deployment Deployment
  28  */
  29
  30 /**
  31  * Base installer class.
  32  *
  33  * This class provides the base for installation and update functionality
  34  * for both MediaWiki core and extensions.
  35  *
  36  * @ingroup Deployment
  37  * @since 1.17
  38  */
  39 abstract class Installer {
  40
  41         /**
  42          * The oldest version of PCRE we can support.
  43          *
  44          * Defining this is necessary because PHP may be linked with a system version
  45          * of PCRE, which may be older than that bundled with the minimum PHP version.
  46          */
  47         const MINIMUM_PCRE_VERSION = '7.2';
  48
  49         /**
  50          * @var array
  51          */
  52         protected $settings;
  53
  54         /**
  55          * List of detected DBs, access using getCompiledDBs().
  56          *
  57          * @var array
  58          */
  59         protected $compiledDBs;
  60
  61         /**
  62          * Cached DB installer instances, access using getDBInstaller().
  63          *
  64          * @var array
  65          */
  66         protected $dbInstallers = array();
  67
  68         /**
  69          * Minimum memory size in MB.
  70          *
  71          * @var int
  72          */
  73         protected $minMemorySize = 50;
  74
  75         /**
  76          * Cached Title, used by parse().
  77          *
  78          * @var Title
  79          */
  80         protected $parserTitle;
  81
  82         /**
  83          * Cached ParserOptions, used by parse().
  84          *
  85          * @var ParserOptions
  86          */
  87         protected $parserOptions;
  88
  89         /**
  90          * Known database types. These correspond to the class names <type>Installer,
  91          * and are also MediaWiki database types valid for $wgDBtype.
  92          *
  93          * To add a new type, create a <type>Installer class and a Database<type>
  94          * class, and add a config-type-<type> message to MessagesEn.php.
  95          *
  96          * @var array
  97          */
  98         protected static $dbTypes = array(
  99                 'mysql',
 100                 'postgres',
 101                 'oracle',
 102                 'mssql',
 103                 'sqlite',
 104         );
 105
 106         /**
 107          * A list of environment check methods called by doEnvironmentChecks().
 108          * These may output warnings using showMessage(), and/or abort the
 109          * installation process by returning false.
 110          *
 111          * For the WebInstaller these are only called on the Welcome page,
 112          * if these methods have side-effects that should affect later page loads
 113          * (as well as the generated stylesheet), use envPreps instead.
 114          *
 115          * @var array
 116          */
 117         protected $envChecks = array(
 118                 'envCheckDB',
 119                 'envCheckRegisterGlobals',
 120                 'envCheckBrokenXML',
 121                 'envCheckMagicQuotes',
 122                 'envCheckMbstring',
 123                 'envCheckSafeMode',
 124                 'envCheckXML',
 125                 'envCheckPCRE',
 126                 'envCheckMemory',
 127                 'envCheckCache',
 128                 'envCheckModSecurity',
 129                 'envCheckDiff3',
 130                 'envCheckGraphics',
 131                 'envCheckGit',
 132                 'envCheckServer',
 133                 'envCheckPath',
 134                 'envCheckShellLocale',
 135                 'envCheckUploadsDirectory',
 136                 'envCheckLibicu',
 137                 'envCheckSuhosinMaxValueLength',
 138                 'envCheckCtype',
 139                 'envCheckIconv',
 140                 'envCheckJSON',
 141         );
 142
 143         /**
 144          * A list of environment preparation methods called by doEnvironmentPreps().
 145          *
 146          * @var array
 147          */
 148         protected $envPreps = array(
 149                 'envPrepExtension',
 150                 'envPrepServer',
 151                 'envPrepPath',
 152         );
 153
 154         /**
 155          * MediaWiki configuration globals that will eventually be passed through
 156          * to LocalSettings.php. The names only are given here, the defaults
 157          * typically come from DefaultSettings.php.
 158          *
 159          * @var array
 160          */
 161         protected $defaultVarNames = array(
 162                 'wgSitename',
 163                 'wgPasswordSender',
 164                 'wgLanguageCode',
 165                 'wgRightsIcon',
 166                 'wgRightsText',
 167                 'wgRightsUrl',
 168                 'wgMainCacheType',
 169                 'wgEnableEmail',
 170                 'wgEnableUserEmail',
 171                 'wgEnotifUserTalk',
 172                 'wgEnotifWatchlist',
 173                 'wgEmailAuthentication',
 174                 'wgDBtype',
 175                 'wgDiff3',
 176                 'wgImageMagickConvertCommand',
 177                 'wgGitBin',
 178                 'IP',
 179                 'wgScriptPath',
 180                 'wgScriptExtension',
 181                 'wgMetaNamespace',
 182                 'wgDeletedDirectory',
 183                 'wgEnableUploads',
 184                 'wgShellLocale',
 185                 'wgSecretKey',
 186                 'wgUseInstantCommons',
 187                 'wgUpgradeKey',
 188                 'wgDefaultSkin',
 189                 'wgResourceLoaderMaxQueryLength',
 190         );
 191
 192         /**
 193          * Variables that are stored alongside globals, and are used for any
 194          * configuration of the installation process aside from the MediaWiki
 195          * configuration. Map of names to defaults.
 196          *
 197          * @var array
 198          */
 199         protected $internalDefaults = array(
 200                 '_UserLang' => 'en',
 201                 '_Environment' => false,
 202                 '_SafeMode' => false,
 203                 '_RaiseMemory' => false,
 204                 '_UpgradeDone' => false,
 205                 '_InstallDone' => false,
 206                 '_Caches' => array(),
 207                 '_InstallPassword' => '',
 208                 '_SameAccount' => true,
 209                 '_CreateDBAccount' => false,
 210                 '_NamespaceType' => 'site-name',
 211                 '_AdminName' => '', // will be set later, when the user selects language
 212                 '_AdminPassword' => '',
 213                 '_AdminPasswordConfirm' => '',
 214                 '_AdminEmail' => '',
 215                 '_Subscribe' => false,
 216                 '_SkipOptional' => 'continue',
 217                 '_RightsProfile' => 'wiki',
 218                 '_LicenseCode' => 'none',
 219                 '_CCDone' => false,
 220                 '_Extensions' => array(),
 221                 '_Skins' => array(),
 222                 '_MemCachedServers' => '',
 223                 '_UpgradeKeySupplied' => false,
 224                 '_ExistingDBSettings' => false,
 225
 226                 // $wgLogo is probably wrong (bug 48084); set something that will work.
 227                 // Single quotes work fine here, as LocalSettingsGenerator outputs this unescaped.
 228                 'wgLogo' => '$wgStylePath/common/images/wiki.png',
 229         );
 230
 231         /**
 232          * The actual list of installation steps. This will be initialized by getInstallSteps()
 233          *
 234          * @var array
 235          */
 236         private $installSteps = array();
 237
 238         /**
 239          * Extra steps for installation, for things like DatabaseInstallers to modify
 240          *
 241          * @var array
 242          */
 243         protected $extraInstallSteps = array();
 244
 245         /**
 246          * Known object cache types and the functions used to test for their existence.
 247          *
 248          * @var array
 249          */
 250         protected $objectCaches = array(
 251                 'xcache' => 'xcache_get',
 252                 'apc' => 'apc_fetch',
 253                 'wincache' => 'wincache_ucache_get'
 254         );
 255
 256         /**
 257          * User rights profiles.
 258          *
 259          * @var array
 260          */
 261         public $rightsProfiles = array(
 262                 'wiki' => array(),
 263                 'no-anon' => array(
 264                         '*' => array( 'edit' => false )
 265                 ),
 266                 'fishbowl' => array(
 267                         '*' => array(
 268                                 'createaccount' => false,
 269                                 'edit' => false,
 270                         ),
 271                 ),
 272                 'private' => array(
 273                         '*' => array(
 274                                 'createaccount' => false,
 275                                 'edit' => false,
 276                                 'read' => false,
 277                         ),
 278                 ),
 279         );
 280
 281         /**
 282          * License types.
 283          *
 284          * @var array
 285          */
 286         public $licenses = array(
 287                 'cc-by' => array(
 288                         'url' => 'http://creativecommons.org/licenses/by/3.0/',
 289                         'icon' => '{$wgStylePath}/common/images/cc-by.png',
 290                 ),
 291                 'cc-by-sa' => array(
 292                         'url' => 'http://creativecommons.org/licenses/by-sa/3.0/',
 293                         'icon' => '{$wgStylePath}/common/images/cc-by-sa.png',
 294                 ),
 295                 'cc-by-nc-sa' => array(
 296                         'url' => 'http://creativecommons.org/licenses/by-nc-sa/3.0/',
 297                         'icon' => '{$wgStylePath}/common/images/cc-by-nc-sa.png',
 298                 ),
 299                 'cc-0' => array(
 300                         'url' => 'https://creativecommons.org/publicdomain/zero/1.0/',
 301                         'icon' => '{$wgStylePath}/common/images/cc-0.png',
 302                 ),
 303                 'pd' => array(
 304                         'url' => '',
 305                         'icon' => '{$wgStylePath}/common/images/public-domain.png',
 306                 ),
 307                 'gfdl' => array(
 308                         'url' => 'http://www.gnu.org/copyleft/fdl.html',
 309                         'icon' => '{$wgStylePath}/common/images/gnu-fdl.png',
 310                 ),
 311                 'none' => array(
 312                         'url' => '',
 313                         'icon' => '',
 314                         'text' => ''
 315                 ),
 316                 'cc-choose' => array(
 317                         // Details will be filled in by the selector.
 318                         'url' => '',
 319                         'icon' => '',
 320                         'text' => '',
 321                 ),
 322         );
 323
 324         /**
 325          * URL to mediawiki-announce subscription
 326          */
 327         protected $mediaWikiAnnounceUrl =
 328                 'https://lists.wikimedia.org/mailman/subscribe/mediawiki-announce';
 329
 330         /**
 331          * Supported language codes for Mailman
 332          */
 333         protected $mediaWikiAnnounceLanguages = array(
 334                 'ca', 'cs', 'da', 'de', 'en', 'es', 'et', 'eu', 'fi', 'fr', 'hr', 'hu',
 335                 'it', 'ja', 'ko', 'lt', 'nl', 'no', 'pl', 'pt', 'pt-br', 'ro', 'ru',
 336                 'sl', 'sr', 'sv', 'tr', 'uk'
 337         );
 338
 339         /**
 340          * UI interface for displaying a short message
 341          * The parameters are like parameters to wfMessage().
 342          * The messages will be in wikitext format, which will be converted to an
 343          * output format such as HTML or text before being sent to the user.
 344          * @param string $msg
 345          */
 346         abstract public function showMessage( $msg /*, ... */ );
 347
 348         /**
 349          * Same as showMessage(), but for displaying errors
 350          * @param string $msg
 351          */
 352         abstract public function showError( $msg /*, ... */ );
 353
 354         /**
 355          * Show a message to the installing user by using a Status object
 356          * @param Status $status
 357          */
 358         abstract public function showStatusMessage( Status $status );
 359
 360         /**
 361          * Constructor, always call this from child classes.
 362          */
 363         public function __construct() {
 364                 global $wgMessagesDirs, $wgUser;
 365
 366                 // Disable the i18n cache
 367                 Language::getLocalisationCache()->disableBackend();
 368                 // Disable LoadBalancer and wfGetDB etc.
 369                 LBFactory::disableBackend();
 370
 371                 // Disable object cache (otherwise CACHE_ANYTHING will try CACHE_DB and
 372                 // SqlBagOStuff will then throw since we just disabled wfGetDB)
 373                 $GLOBALS['wgMemc'] = new EmptyBagOStuff;
 374                 ObjectCache::clear();
 375                 $emptyCache = array( 'class' => 'EmptyBagOStuff' );
 376                 $GLOBALS['wgObjectCaches'] = array(
 377                         CACHE_NONE => $emptyCache,
 378                         CACHE_DB => $emptyCache,
 379                         CACHE_ANYTHING => $emptyCache,
 380                         CACHE_MEMCACHED => $emptyCache,
 381                 );
 382
 383                 // Load the installer's i18n.
 384                 $wgMessagesDirs['MediawikiInstaller'] = __DIR__ . '/i18n';
 385
 386                 // Having a user with id = 0 safeguards us from DB access via User::loadOptions().
 387                 $wgUser = User::newFromId( 0 );
 388
 389                 $this->settings = $this->internalDefaults;
 390
 391                 foreach ( $this->defaultVarNames as $var ) {
 392                         $this->settings[$var] = $GLOBALS[$var];
 393                 }
 394
 395                 $this->doEnvironmentPreps();
 396
 397                 $this->compiledDBs = array();
 398                 foreach ( self::getDBTypes() as $type ) {
 399                         $installer = $this->getDBInstaller( $type );
 400
 401                         if ( !$installer->isCompiled() ) {
 402                                 continue;
 403                         }
 404                         $this->compiledDBs[] = $type;
 405                 }
 406
 407                 $this->parserTitle = Title::newFromText( 'Installer' );
 408                 $this->parserOptions = new ParserOptions; // language will be wrong :(
 409                 $this->parserOptions->setEditSection( false );
 410         }
 411
 412         /**
 413          * Get a list of known DB types.
 414          *
 415          * @return array
 416          */
 417         public static function getDBTypes() {
 418                 return self::$dbTypes;
 419         }
 420
 421         /**
 422          * Do initial checks of the PHP environment. Set variables according to
 423          * the observed environment.
 424          *
 425          * It's possible that this may be called under the CLI SAPI, not the SAPI
 426          * that the wiki will primarily run under. In that case, the subclass should
 427          * initialise variables such as wgScriptPath, before calling this function.
 428          *
 429          * Under the web subclass, it can already be assumed that PHP 5+ is in use
 430          * and that sessions are working.
 431          *
 432          * @return Status
 433          */
 434         public function doEnvironmentChecks() {
 435                 // Php version has already been checked by entry scripts
 436                 // Show message here for information purposes
 437                 if ( wfIsHHVM() ) {
 438                         $this->showMessage( 'config-env-hhvm', HHVM_VERSION );
 439                 } else {
 440                         $this->showMessage( 'config-env-php', PHP_VERSION );
 441                 }
 442
 443                 $good = true;
 444                 // Must go here because an old version of PCRE can prevent other checks from completing
 445                 list( $pcreVersion ) = explode( ' ', PCRE_VERSION, 2 );
 446                 if ( version_compare( $pcreVersion, self::MINIMUM_PCRE_VERSION, '<' ) ) {
 447                         $this->showError( 'config-pcre-old', self::MINIMUM_PCRE_VERSION, $pcreVersion );
 448                         $good = false;
 449                 } else {
 450                         foreach ( $this->envChecks as $check ) {
 451                                 $status = $this->$check();
 452                                 if ( $status === false ) {
 453                                         $good = false;
 454                                 }
 455                         }
 456                 }
 457
 458                 $this->setVar( '_Environment', $good );
 459
 460                 return $good ? Status::newGood() : Status::newFatal( 'config-env-bad' );
 461         }
 462
 463         public function doEnvironmentPreps() {
 464                 foreach ( $this->envPreps as $prep ) {
 465                         $this->$prep();
 466                 }
 467         }
 468
 469         /**
 470          * Set a MW configuration variable, or internal installer configuration variable.
 471          *
 472          * @param string $name
 473          * @param mixed $value
 474          */
 475         public function setVar( $name, $value ) {
 476                 $this->settings[$name] = $value;
 477         }
 478
 479         /**
 480          * Get an MW configuration variable, or internal installer configuration variable.
 481          * The defaults come from $GLOBALS (ultimately DefaultSettings.php).
 482          * Installer variables are typically prefixed by an underscore.
 483          *
 484          * @param string $name
 485          * @param mixed $default
 486          *
 487          * @return mixed
 488          */
 489         public function getVar( $name, $default = null ) {
 490                 if ( !isset( $this->settings[$name] ) ) {
 491                         return $default;
 492                 } else {
 493                         return $this->settings[$name];
 494                 }
 495         }
 496
 497         /**
 498          * Get a list of DBs supported by current PHP setup
 499          *
 500          * @return array
 501          */
 502         public function getCompiledDBs() {
 503                 return $this->compiledDBs;
 504         }
 505
 506         /**
 507          * Get an instance of DatabaseInstaller for the specified DB type.
 508          *
 509          * @param mixed $type DB installer for which is needed, false to use default.
 510          *
 511          * @return DatabaseInstaller
 512          */
 513         public function getDBInstaller( $type = false ) {
 514                 if ( !$type ) {
 515                         $type = $this->getVar( 'wgDBtype' );
 516                 }
 517
 518                 $type = strtolower( $type );
 519
 520                 if ( !isset( $this->dbInstallers[$type] ) ) {
 521                         $class = ucfirst( $type ) . 'Installer';
 522                         $this->dbInstallers[$type] = new $class( $this );
 523                 }
 524
 525                 return $this->dbInstallers[$type];
 526         }
 527
 528         /**
 529          * Determine if LocalSettings.php exists. If it does, return its variables.
 530          *
 531          * @return array
 532          */
 533         public static function getExistingLocalSettings() {
 534                 global $IP;
 535
 536                 // You might be wondering why this is here. Well if you don't do this
 537                 // then some poorly-formed extensions try to call their own classes
 538                 // after immediately registering them. We really need to get extension
 539                 // registration out of the global scope and into a real format.
 540                 // @see https://bugzilla.wikimedia.org/67440
 541                 global $wgAutoloadClasses;
 542
 543                 wfSuppressWarnings();
 544                 $_lsExists = file_exists( "$IP/LocalSettings.php" );
 545                 wfRestoreWarnings();
 546
 547                 if ( !$_lsExists ) {
 548                         return false;
 549                 }
 550                 unset( $_lsExists );
 551
 552                 require "$IP/includes/DefaultSettings.php";
 553                 require "$IP/LocalSettings.php";
 554
 555                 return get_defined_vars();
 556         }
 557
 558         /**
 559          * Get a fake password for sending back to the user in HTML.
 560          * This is a security mechanism to avoid compromise of the password in the
 561          * event of session ID compromise.
 562          *
 563          * @param string $realPassword
 564          *
 565          * @return string
 566          */
 567         public function getFakePassword( $realPassword ) {
 568                 return str_repeat( '*', strlen( $realPassword ) );
 569         }
 570
 571         /**
 572          * Set a variable which stores a password, except if the new value is a
 573          * fake password in which case leave it as it is.
 574          *
 575          * @param string $name
 576          * @param mixed $value
 577          */
 578         public function setPassword( $name, $value ) {
 579                 if ( !preg_match( '/^\*+$/', $value ) ) {
 580                         $this->setVar( $name, $value );
 581                 }
 582         }
 583
 584         /**
 585          * On POSIX systems return the primary group of the webserver we're running under.
 586          * On other systems just returns null.
 587          *
 588          * This is used to advice the user that he should chgrp his mw-config/data/images directory as the
 589          * webserver user before he can install.
 590          *
 591          * Public because SqliteInstaller needs it, and doesn't subclass Installer.
 592          *
 593          * @return mixed
 594          */
 595         public static function maybeGetWebserverPrimaryGroup() {
 596                 if ( !function_exists( 'posix_getegid' ) || !function_exists( 'posix_getpwuid' ) ) {
 597                         # I don't know this, this isn't UNIX.
 598                         return null;
 599                 }
 600
 601                 # posix_getegid() *not* getmygid() because we want the group of the webserver,
 602                 # not whoever owns the current script.
 603                 $gid = posix_getegid();
 604                 $getpwuid = posix_getpwuid( $gid );
 605                 $group = $getpwuid['name'];
 606
 607                 return $group;
 608         }
 609
 610         /**
 611          * Convert wikitext $text to HTML.
 612          *
 613          * This is potentially error prone since many parser features require a complete
 614          * installed MW database. The solution is to just not use those features when you
 615          * write your messages. This appears to work well enough. Basic formatting and
 616          * external links work just fine.
 617          *
 618          * But in case a translator decides to throw in a "#ifexist" or internal link or
 619          * whatever, this function is guarded to catch the attempted DB access and to present
 620          * some fallback text.
 621          *
 622          * @param string $text
 623          * @param bool $lineStart
 624          * @return string
 625          */
 626         public function parse( $text, $lineStart = false ) {
 627                 global $wgParser;
 628
 629                 try {
 630                         $out = $wgParser->parse( $text, $this->parserTitle, $this->parserOptions, $lineStart );
 631                         $html = $out->getText();
 632                 } catch ( DBAccessError $e ) {
 633                         $html = '<!--DB access attempted during parse-->  ' . htmlspecialchars( $text );
 634
 635                         if ( !empty( $this->debug ) ) {
 636                                 $html .= "<!--\n" . $e->getTraceAsString() . "\n-->";
 637                         }
 638                 }
 639
 640                 return $html;
 641         }
 642
 643         /**
 644          * @return ParserOptions
 645          */
 646         public function getParserOptions() {
 647                 return $this->parserOptions;
 648         }
 649
 650         public function disableLinkPopups() {
 651                 $this->parserOptions->setExternalLinkTarget( false );
 652         }
 653
 654         public function restoreLinkPopups() {
 655                 global $wgExternalLinkTarget;
 656                 $this->parserOptions->setExternalLinkTarget( $wgExternalLinkTarget );
 657         }
 658
 659         /**
 660          * Install step which adds a row to the site_stats table with appropriate
 661          * initial values.
 662          *
 663          * @param DatabaseInstaller $installer
 664          *
 665          * @return Status
 666          */
 667         public function populateSiteStats( DatabaseInstaller $installer ) {
 668                 $status = $installer->getConnection();
 669                 if ( !$status->isOK() ) {
 670                         return $status;
 671                 }
 672                 $status->value->insert(
 673                         'site_stats',
 674                         array(
 675                                 'ss_row_id' => 1,
 676                                 'ss_total_views' => 0,
 677                                 'ss_total_edits' => 0,
 678                                 'ss_good_articles' => 0,
 679                                 'ss_total_pages' => 0,
 680                                 'ss_users' => 0,
 681                                 'ss_images' => 0
 682                         ),
 683                         __METHOD__, 'IGNORE'
 684                 );
 685
 686                 return Status::newGood();
 687         }
 688
 689         /**
 690          * Exports all wg* variables stored by the installer into global scope.
 691          */
 692         public function exportVars() {
 693                 foreach ( $this->settings as $name => $value ) {
 694                         if ( substr( $name, 0, 2 ) == 'wg' ) {
 695                                 $GLOBALS[$name] = $value;
 696                         }
 697                 }
 698         }
 699
 700         /**
 701          * Environment check for DB types.
 702          * @return bool
 703          */
 704         protected function envCheckDB() {
 705                 global $wgLang;
 706
 707                 $allNames = array();
 708
 709                 // Messages: config-type-mysql, config-type-postgres, config-type-oracle,
 710                 // config-type-sqlite
 711                 foreach ( self::getDBTypes() as $name ) {
 712                         $allNames[] = wfMessage( "config-type-$name" )->text();
 713                 }
 714
 715                 $databases = $this->getCompiledDBs();
 716
 717                 $databases = array_flip( $databases );
 718                 foreach ( array_keys( $databases ) as $db ) {
 719                         $installer = $this->getDBInstaller( $db );
 720                         $status = $installer->checkPrerequisites();
 721                         if ( !$status->isGood() ) {
 722                                 $this->showStatusMessage( $status );
 723                         }
 724                         if ( !$status->isOK() ) {
 725                                 unset( $databases[$db] );
 726                         }
 727                 }
 728                 $databases = array_flip( $databases );
 729                 if ( !$databases ) {
 730                         $this->showError( 'config-no-db', $wgLang->commaList( $allNames ) );
 731
 732                         // @todo FIXME: This only works for the web installer!
 733                         return false;
 734                 }
 735
 736                 return true;
 737         }
 738
 739         /**
 740          * Environment check for register_globals.
 741          * Prevent installation if enabled
 742          */
 743         protected function envCheckRegisterGlobals() {
 744                 if ( wfIniGetBool( 'register_globals' ) ) {
 745                         $this->showMessage( 'config-register-globals-error' );
 746                         return false;
 747                 }
 748
 749                 return true;
 750         }
 751
 752         /**
 753          * Some versions of libxml+PHP break < and > encoding horribly
 754          * @return bool
 755          */
 756         protected function envCheckBrokenXML() {
 757                 $test = new PhpXmlBugTester();
 758                 if ( !$test->ok ) {
 759                         $this->showError( 'config-brokenlibxml' );
 760
 761                         return false;
 762                 }
 763
 764                 return true;
 765         }
 766
 767         /**
 768          * Environment check for magic_quotes_(gpc|runtime|sybase).
 769          * @return bool
 770          */
 771         protected function envCheckMagicQuotes() {
 772                 $status = true;
 773                 foreach ( array( 'gpc', 'runtime', 'sybase' ) as $magicJunk ) {
 774                         if ( wfIniGetBool( "magic_quotes_$magicJunk" ) ) {
 775                                 $this->showError( "config-magic-quotes-$magicJunk" );
 776                                 $status = false;
 777                         }
 778                 }
 779
 780                 return $status;
 781         }
 782
 783         /**
 784          * Environment check for mbstring.func_overload.
 785          * @return bool
 786          */
 787         protected function envCheckMbstring() {
 788                 if ( wfIniGetBool( 'mbstring.func_overload' ) ) {
 789                         $this->showError( 'config-mbstring' );
 790
 791                         return false;
 792                 }
 793
 794                 return true;
 795         }
 796
 797         /**
 798          * Environment check for safe_mode.
 799          * @return bool
 800          */
 801         protected function envCheckSafeMode() {
 802                 if ( wfIniGetBool( 'safe_mode' ) ) {
 803                         $this->setVar( '_SafeMode', true );
 804                         $this->showMessage( 'config-safe-mode' );
 805                 }
 806
 807                 return true;
 808         }
 809
 810         /**
 811          * Environment check for the XML module.
 812          * @return bool
 813          */
 814         protected function envCheckXML() {
 815                 if ( !function_exists( "utf8_encode" ) ) {
 816                         $this->showError( 'config-xml-bad' );
 817
 818                         return false;
 819                 }
 820
 821                 return true;
 822         }
 823
 824         /**
 825          * Environment check for the PCRE module.
 826          *
 827          * @note If this check were to fail, the parser would
 828          *   probably throw an exception before the result
 829          *   of this check is shown to the user.
 830          * @return bool
 831          */
 832         protected function envCheckPCRE() {
 833                 wfSuppressWarnings();
 834                 $regexd = preg_replace( '/[\x{0430}-\x{04FF}]/iu', '', '-АБВГД-' );
 835                 // Need to check for \p support too, as PCRE can be compiled
 836                 // with utf8 support, but not unicode property support.
 837                 // check that \p{Zs} (space separators) matches
 838                 // U+3000 (Ideographic space)
 839                 $regexprop = preg_replace( '/\p{Zs}/u', '', "-\xE3\x80\x80-" );
 840                 wfRestoreWarnings();
 841                 if ( $regexd != '--' || $regexprop != '--' ) {
 842                         $this->showError( 'config-pcre-no-utf8' );
 843
 844                         return false;
 845                 }
 846
 847                 return true;
 848         }
 849
 850         /**
 851          * Environment check for available memory.
 852          * @return bool
 853          */
 854         protected function envCheckMemory() {
 855                 $limit = ini_get( 'memory_limit' );
 856
 857                 if ( !$limit || $limit == -1 ) {
 858                         return true;
 859                 }
 860
 861                 $n = wfShorthandToInteger( $limit );
 862
 863                 if ( $n < $this->minMemorySize * 1024 * 1024 ) {
 864                         $newLimit = "{$this->minMemorySize}M";
 865
 866                         if ( ini_set( "memory_limit", $newLimit ) === false ) {
 867                                 $this->showMessage( 'config-memory-bad', $limit );
 868                         } else {
 869                                 $this->showMessage( 'config-memory-raised', $limit, $newLimit );
 870                                 $this->setVar( '_RaiseMemory', true );
 871                         }
 872                 }
 873
 874                 return true;
 875         }
 876
 877         /**
 878          * Environment check for compiled object cache types.
 879          */
 880         protected function envCheckCache() {
 881                 $caches = array();
 882                 foreach ( $this->objectCaches as $name => $function ) {
 883                         if ( function_exists( $function ) ) {
 884                                 if ( $name == 'xcache' && !wfIniGetBool( 'xcache.var_size' ) ) {
 885                                         continue;
 886                                 }
 887                                 $caches[$name] = true;
 888                         }
 889                 }
 890
 891                 if ( !$caches ) {
 892                         $this->showMessage( 'config-no-cache' );
 893                 }
 894
 895                 $this->setVar( '_Caches', $caches );
 896         }
 897
 898         /**
 899          * Scare user to death if they have mod_security
 900          * @return bool
 901          */
 902         protected function envCheckModSecurity() {
 903                 if ( self::apacheModulePresent( 'mod_security' ) ) {
 904                         $this->showMessage( 'config-mod-security' );
 905                 }
 906
 907                 return true;
 908         }
 909
 910         /**
 911          * Search for GNU diff3.
 912          * @return bool
 913          */
 914         protected function envCheckDiff3() {
 915                 $names = array( "gdiff3", "diff3", "diff3.exe" );
 916                 $versionInfo = array( '$1 --version 2>&1', 'GNU diffutils' );
 917
 918                 $diff3 = self::locateExecutableInDefaultPaths( $names, $versionInfo );
 919
 920                 if ( $diff3 ) {
 921                         $this->setVar( 'wgDiff3', $diff3 );
 922                 } else {
 923                         $this->setVar( 'wgDiff3', false );
 924                         $this->showMessage( 'config-diff3-bad' );
 925                 }
 926
 927                 return true;
 928         }
 929
 930         /**
 931          * Environment check for ImageMagick and GD.
 932          * @return bool
 933          */
 934         protected function envCheckGraphics() {
 935                 $names = array( wfIsWindows() ? 'convert.exe' : 'convert' );
 936                 $versionInfo = array( '$1 -version', 'ImageMagick' );
 937                 $convert = self::locateExecutableInDefaultPaths( $names, $versionInfo );
 938
 939                 $this->setVar( 'wgImageMagickConvertCommand', '' );
 940                 if ( $convert ) {
 941                         $this->setVar( 'wgImageMagickConvertCommand', $convert );
 942                         $this->showMessage( 'config-imagemagick', $convert );
 943
 944                         return true;
 945                 } elseif ( function_exists( 'imagejpeg' ) ) {
 946                         $this->showMessage( 'config-gd' );
 947                 } else {
 948                         $this->showMessage( 'config-no-scaling' );
 949                 }
 950
 951                 return true;
 952         }
 953
 954         /**
 955          * Search for git.
 956          *
 957          * @since 1.22
 958          * @return bool
 959          */
 960         protected function envCheckGit() {
 961                 $names = array( wfIsWindows() ? 'git.exe' : 'git' );
 962                 $versionInfo = array( '$1 --version', 'git version' );
 963
 964                 $git = self::locateExecutableInDefaultPaths( $names, $versionInfo );
 965
 966                 if ( $git ) {
 967                         $this->setVar( 'wgGitBin', $git );
 968                         $this->showMessage( 'config-git', $git );
 969                 } else {
 970                         $this->setVar( 'wgGitBin', false );
 971                         $this->showMessage( 'config-git-bad' );
 972                 }
 973
 974                 return true;
 975         }
 976
 977         /**
 978          * Environment check to inform user which server we've assumed.
 979          *
 980          * @return bool
 981          */
 982         protected function envCheckServer() {
 983                 $server = $this->envGetDefaultServer();
 984                 if ( $server !== null ) {
 985                         $this->showMessage( 'config-using-server', $server );
 986                 }
 987                 return true;
 988         }
 989
 990         /**
 991          * Environment check to inform user which paths we've assumed.
 992          *
 993          * @return bool
 994          */
 995         protected function envCheckPath() {
 996                 $this->showMessage(
 997                         'config-using-uri',
 998                         $this->getVar( 'wgServer' ),
 999                         $this->getVar( 'wgScriptPath' )
1000                 );
1001                 return true;
1002         }
1003
1004         /**
1005          * Environment check for preferred locale in shell
1006          * @return bool
1007          */
1008         protected function envCheckShellLocale() {
1009                 $os = php_uname( 's' );
1010                 $supported = array( 'Linux', 'SunOS', 'HP-UX', 'Darwin' ); # Tested these
1011
1012                 if ( !in_array( $os, $supported ) ) {
1013                         return true;
1014                 }
1015
1016                 # Get a list of available locales.
1017                 $ret = false;
1018                 $lines = wfShellExec( '/usr/bin/locale -a', $ret );
1019
1020                 if ( $ret ) {
1021                         return true;
1022                 }
1023
1024                 $lines = array_map( 'trim', explode( "\n", $lines ) );
1025                 $candidatesByLocale = array();
1026                 $candidatesByLang = array();
1027
1028                 foreach ( $lines as $line ) {
1029                         if ( $line === '' ) {
1030                                 continue;
1031                         }
1032
1033                         if ( !preg_match( '/^([a-zA-Z]+)(_[a-zA-Z]+|)\.(utf8|UTF-8)(@[a-zA-Z_]*|)$/i', $line, $m ) ) {
1034                                 continue;
1035                         }
1036
1037                         list( , $lang, , , ) = $m;
1038
1039                         $candidatesByLocale[$m[0]] = $m;
1040                         $candidatesByLang[$lang][] = $m;
1041                 }
1042
1043                 # Try the current value of LANG.
1044                 if ( isset( $candidatesByLocale[getenv( 'LANG' )] ) ) {
1045                         $this->setVar( 'wgShellLocale', getenv( 'LANG' ) );
1046
1047                         return true;
1048                 }
1049
1050                 # Try the most common ones.
1051                 $commonLocales = array( 'en_US.UTF-8', 'en_US.utf8', 'de_DE.UTF-8', 'de_DE.utf8' );
1052                 foreach ( $commonLocales as $commonLocale ) {
1053                         if ( isset( $candidatesByLocale[$commonLocale] ) ) {
1054                                 $this->setVar( 'wgShellLocale', $commonLocale );
1055
1056                                 return true;
1057                         }
1058                 }
1059
1060                 # Is there an available locale in the Wiki's language?
1061                 $wikiLang = $this->getVar( 'wgLanguageCode' );
1062
1063                 if ( isset( $candidatesByLang[$wikiLang] ) ) {
1064                         $m = reset( $candidatesByLang[$wikiLang] );
1065                         $this->setVar( 'wgShellLocale', $m[0] );
1066
1067                         return true;
1068                 }
1069
1070                 # Are there any at all?
1071                 if ( count( $candidatesByLocale ) ) {
1072                         $m = reset( $candidatesByLocale );
1073                         $this->setVar( 'wgShellLocale', $m[0] );
1074
1075                         return true;
1076                 }
1077
1078                 # Give up.
1079                 return true;
1080         }
1081
1082         /**
1083          * Environment check for the permissions of the uploads directory
1084          * @return bool
1085          */
1086         protected function envCheckUploadsDirectory() {
1087                 global $IP;
1088
1089                 $dir = $IP . '/images/';
1090                 $url = $this->getVar( 'wgServer' ) . $this->getVar( 'wgScriptPath' ) . '/images/';
1091                 $safe = !$this->dirIsExecutable( $dir, $url );
1092
1093                 if ( !$safe ) {
1094                         $this->showMessage( 'config-uploads-not-safe', $dir );
1095                 }
1096
1097                 return true;
1098         }
1099
1100         /**
1101          * Checks if suhosin.get.max_value_length is set, and if so generate
1102          * a warning because it decreases ResourceLoader performance.
1103          * @return bool
1104          */
1105         protected function envCheckSuhosinMaxValueLength() {
1106                 $maxValueLength = ini_get( 'suhosin.get.max_value_length' );
1107                 if ( $maxValueLength > 0 && $maxValueLength < 1024 ) {
1108                         // Only warn if the value is below the sane 1024
1109                         $this->showMessage( 'config-suhosin-max-value-length', $maxValueLength );
1110                 }
1111
1112                 return true;
1113         }
1114
1115         /**
1116          * Convert a hex string representing a Unicode code point to that code point.
1117          * @param string $c
1118          * @return string
1119          */
1120         protected function unicodeChar( $c ) {
1121                 $c = hexdec( $c );
1122                 if ( $c <= 0x7F ) {
1123                         return chr( $c );
1124                 } elseif ( $c <= 0x7FF ) {
1125                         return chr( 0xC0 | $c >> 6 ) . chr( 0x80 | $c & 0x3F );
1126                 } elseif ( $c <= 0xFFFF ) {
1127                         return chr( 0xE0 | $c >> 12 ) . chr( 0x80 | $c >> 6 & 0x3F )
1128                         . chr( 0x80 | $c & 0x3F );
1129                 } elseif ( $c <= 0x10FFFF ) {
1130                         return chr( 0xF0 | $c >> 18 ) . chr( 0x80 | $c >> 12 & 0x3F )
1131                         . chr( 0x80 | $c >> 6 & 0x3F )
1132                         . chr( 0x80 | $c & 0x3F );
1133                 } else {
1134                         return false;
1135                 }
1136         }
1137
1138         /**
1139          * Check the libicu version
1140          */
1141         protected function envCheckLibicu() {
1142                 $utf8 = function_exists( 'utf8_normalize' );
1143                 $intl = function_exists( 'normalizer_normalize' );
1144
1145                 /**
1146                  * This needs to be updated something that the latest libicu
1147                  * will properly normalize.  This normalization was found at
1148                  * http://www.unicode.org/versions/Unicode5.2.0/#Character_Additions
1149                  * Note that we use the hex representation to create the code
1150                  * points in order to avoid any Unicode-destroying during transit.
1151                  */
1152                 $not_normal_c = $this->unicodeChar( "FA6C" );
1153                 $normal_c = $this->unicodeChar( "242EE" );
1154
1155                 $useNormalizer = 'php';
1156                 $needsUpdate = false;
1157
1158                 /**
1159                  * We're going to prefer the pecl extension here unless
1160                  * utf8_normalize is more up to date.
1161                  */
1162                 if ( $utf8 ) {
1163                         $useNormalizer = 'utf8';
1164                         $utf8 = utf8_normalize( $not_normal_c, UtfNormal::UNORM_NFC );
1165                         if ( $utf8 !== $normal_c ) {
1166                                 $needsUpdate = true;
1167                         }
1168                 }
1169                 if ( $intl ) {
1170                         $useNormalizer = 'intl';
1171                         $intl = normalizer_normalize( $not_normal_c, Normalizer::FORM_C );
1172                         if ( $intl !== $normal_c ) {
1173                                 $needsUpdate = true;
1174                         }
1175                 }
1176
1177                 // Uses messages 'config-unicode-using-php', 'config-unicode-using-utf8',
1178                 // 'config-unicode-using-intl'
1179                 if ( $useNormalizer === 'php' ) {
1180                         $this->showMessage( 'config-unicode-pure-php-warning' );
1181                 } else {
1182                         $this->showMessage( 'config-unicode-using-' . $useNormalizer );
1183                         if ( $needsUpdate ) {
1184                                 $this->showMessage( 'config-unicode-update-warning' );
1185                         }
1186                 }
1187         }
1188
1189         /**
1190          * @return bool
1191          */
1192         protected function envCheckCtype() {
1193                 if ( !function_exists( 'ctype_digit' ) ) {
1194                         $this->showError( 'config-ctype' );
1195
1196                         return false;
1197                 }
1198
1199                 return true;
1200         }
1201
1202         /**
1203          * @return bool
1204          */
1205         protected function envCheckIconv() {
1206                 if ( !function_exists( 'iconv' ) ) {
1207                         $this->showError( 'config-iconv' );
1208
1209                         return false;
1210                 }
1211
1212                 return true;
1213         }
1214
1215         /**
1216          * @return bool
1217          */
1218         protected function envCheckJSON() {
1219                 if ( !function_exists( 'json_decode' ) ) {
1220                         $this->showError( 'config-json' );
1221
1222                         return false;
1223                 }
1224
1225                 return true;
1226         }
1227
1228         /**
1229          * Environment prep for the server hostname.
1230          */
1231         protected function envPrepServer() {
1232                 $server = $this->envGetDefaultServer();
1233                 if ( $server !== null ) {
1234                         $this->setVar( 'wgServer', $server );
1235                 }
1236         }
1237
1238         /**
1239          * Helper function to be called from envPrepServer()
1240          * @return string
1241          */
1242         abstract protected function envGetDefaultServer();
1243
1244         /**
1245          * Environment prep for setting the preferred PHP file extension.
1246          */
1247         protected function envPrepExtension() {
1248                 // @todo FIXME: Detect this properly
1249                 if ( defined( 'MW_INSTALL_PHP5_EXT' ) ) {
1250                         $ext = '.php5';
1251                 } else {
1252                         $ext = '.php';
1253                 }
1254                 $this->setVar( 'wgScriptExtension', $ext );
1255         }
1256
1257         /**
1258          * Environment prep for setting $IP and $wgScriptPath.
1259          */
1260         protected function envPrepPath() {
1261                 global $IP;
1262                 $IP = dirname( dirname( __DIR__ ) );
1263                 $this->setVar( 'IP', $IP );
1264         }
1265
1266         /**
1267          * Get an array of likely places we can find executables. Check a bunch
1268          * of known Unix-like defaults, as well as the PATH environment variable
1269          * (which should maybe make it work for Windows?)
1270          *
1271          * @return array
1272          */
1273         protected static function getPossibleBinPaths() {
1274                 return array_merge(
1275                         array( '/usr/bin', '/usr/local/bin', '/opt/csw/bin',
1276                                 '/usr/gnu/bin', '/usr/sfw/bin', '/sw/bin', '/opt/local/bin' ),
1277                         explode( PATH_SEPARATOR, getenv( 'PATH' ) )
1278                 );
1279         }
1280
1281         /**
1282          * Search a path for any of the given executable names. Returns the
1283          * executable name if found. Also checks the version string returned
1284          * by each executable.
1285          *
1286          * Used only by environment checks.
1287          *
1288          * @param string $path Path to search
1289          * @param array $names Array of executable names
1290          * @param array|bool $versionInfo False or array with two members:
1291          *   0 => Command to run for version check, with $1 for the full executable name
1292          *   1 => String to compare the output with
1293          *
1294          * If $versionInfo is not false, only executables with a version
1295          * matching $versionInfo[1] will be returned.
1296          * @return bool|string
1297          */
1298         public static function locateExecutable( $path, $names, $versionInfo = false ) {
1299                 if ( !is_array( $names ) ) {
1300                         $names = array( $names );
1301                 }
1302
1303                 foreach ( $names as $name ) {
1304                         $command = $path . DIRECTORY_SEPARATOR . $name;
1305
1306                         wfSuppressWarnings();
1307                         $file_exists = file_exists( $command );
1308                         wfRestoreWarnings();
1309
1310                         if ( $file_exists ) {
1311                                 if ( !$versionInfo ) {
1312                                         return $command;
1313                                 }
1314
1315                                 $file = str_replace( '$1', wfEscapeShellArg( $command ), $versionInfo[0] );
1316                                 if ( strstr( wfShellExec( $file ), $versionInfo[1] ) !== false ) {
1317                                         return $command;
1318                                 }
1319                         }
1320                 }
1321
1322                 return false;
1323         }
1324
1325         /**
1326          * Same as locateExecutable(), but checks in getPossibleBinPaths() by default
1327          * @see locateExecutable()
1328          * @param array $names Array of possible names.
1329          * @param array|bool $versionInfo Default: false or array with two members:
1330          *   0 => Command to run for version check, with $1 for the full executable name
1331          *   1 => String to compare the output with
1332          *
1333          * If $versionInfo is not false, only executables with a version
1334          * matching $versionInfo[1] will be returned.
1335          * @return bool|string
1336          */
1337         public static function locateExecutableInDefaultPaths( $names, $versionInfo = false ) {
1338                 foreach ( self::getPossibleBinPaths() as $path ) {
1339                         $exe = self::locateExecutable( $path, $names, $versionInfo );
1340                         if ( $exe !== false ) {
1341                                 return $exe;
1342                         }
1343                 }
1344
1345                 return false;
1346         }
1347
1348         /**
1349          * Checks if scripts located in the given directory can be executed via the given URL.
1350          *
1351          * Used only by environment checks.
1352          * @param string $dir
1353          * @param string $url
1354          * @return bool|int|string
1355          */
1356         public function dirIsExecutable( $dir, $url ) {
1357                 $scriptTypes = array(
1358                         'php' => array(
1359                                 "<?php echo 'ex' . 'ec';",
1360                                 "#!/var/env php5\n<?php echo 'ex' . 'ec';",
1361                         ),
1362                 );
1363
1364                 // it would be good to check other popular languages here, but it'll be slow.
1365
1366                 wfSuppressWarnings();
1367
1368                 foreach ( $scriptTypes as $ext => $contents ) {
1369                         foreach ( $contents as $source ) {
1370                                 $file = 'exectest.' . $ext;
1371
1372                                 if ( !file_put_contents( $dir . $file, $source ) ) {
1373                                         break;
1374                                 }
1375
1376                                 try {
1377                                         $text = Http::get( $url . $file, array( 'timeout' => 3 ) );
1378                                 } catch ( MWException $e ) {
1379                                         // Http::get throws with allow_url_fopen = false and no curl extension.
1380                                         $text = null;
1381                                 }
1382                                 unlink( $dir . $file );
1383
1384                                 if ( $text == 'exec' ) {
1385                                         wfRestoreWarnings();
1386
1387                                         return $ext;
1388                                 }
1389                         }
1390                 }
1391
1392                 wfRestoreWarnings();
1393
1394                 return false;
1395         }
1396
1397         /**
1398          * Checks for presence of an Apache module. Works only if PHP is running as an Apache module, too.
1399          *
1400          * @param string $moduleName Name of module to check.
1401          * @return bool
1402          */
1403         public static function apacheModulePresent( $moduleName ) {
1404                 if ( function_exists( 'apache_get_modules' ) && in_array( $moduleName, apache_get_modules() ) ) {
1405                         return true;
1406                 }
1407                 // try it the hard way
1408                 ob_start();
1409                 phpinfo( INFO_MODULES );
1410                 $info = ob_get_clean();
1411
1412                 return strpos( $info, $moduleName ) !== false;
1413         }
1414
1415         /**
1416          * ParserOptions are constructed before we determined the language, so fix it
1417          *
1418          * @param Language $lang
1419          */
1420         public function setParserLanguage( $lang ) {
1421                 $this->parserOptions->setTargetLanguage( $lang );
1422                 $this->parserOptions->setUserLang( $lang );
1423         }
1424
1425         /**
1426          * Overridden by WebInstaller to provide lastPage parameters.
1427          * @param string $page
1428          * @return string
1429          */
1430         protected function getDocUrl( $page ) {
1431                 return "{$_SERVER['PHP_SELF']}?page=" . urlencode( $page );
1432         }
1433
1434         /**
1435          * Finds extensions that follow the format /$directory/Name/Name.php,
1436          * and returns an array containing the value for 'Name' for each found extension.
1437          *
1438          * Reasonable values for $directory include 'extensions' (the default) and 'skins'.
1439          *
1440          * @param string $directory Directory to search in
1441          * @return array
1442          */
1443         public function findExtensions( $directory = 'extensions' ) {
1444                 if ( $this->getVar( 'IP' ) === null ) {
1445                         return array();
1446                 }
1447
1448                 $extDir = $this->getVar( 'IP' ) . '/' . $directory;
1449                 if ( !is_readable( $extDir ) || !is_dir( $extDir ) ) {
1450                         return array();
1451                 }
1452
1453                 $dh = opendir( $extDir );
1454                 $exts = array();
1455                 while ( ( $file = readdir( $dh ) ) !== false ) {
1456                         if ( !is_dir( "$extDir/$file" ) ) {
1457                                 continue;
1458                         }
1459                         if ( file_exists( "$extDir/$file/$file.php" ) ) {
1460                                 $exts[] = $file;
1461                         }
1462                 }
1463                 closedir( $dh );
1464                 natcasesort( $exts );
1465
1466                 return $exts;
1467         }
1468
1469         /**
1470          * Installs the auto-detected extensions.
1471          *
1472          * @return Status
1473          */
1474         protected function includeExtensions() {
1475                 global $IP;
1476                 $exts = $this->getVar( '_Extensions' );
1477                 $IP = $this->getVar( 'IP' );
1478
1479                 /**
1480                  * We need to include DefaultSettings before including extensions to avoid
1481                  * warnings about unset variables. However, the only thing we really
1482                  * want here is $wgHooks['LoadExtensionSchemaUpdates']. This won't work
1483                  * if the extension has hidden hook registration in $wgExtensionFunctions,
1484                  * but we're not opening that can of worms
1485                  * @see https://bugzilla.wikimedia.org/show_bug.cgi?id=26857
1486                  */
1487                 global $wgAutoloadClasses;
1488                 $wgAutoloadClasses = array();
1489
1490                 require "$IP/includes/DefaultSettings.php";
1491
1492                 foreach ( $exts as $e ) {
1493                         require_once "$IP/extensions/$e/$e.php";
1494                 }
1495
1496                 $hooksWeWant = isset( $wgHooks['LoadExtensionSchemaUpdates'] ) ?
1497                         $wgHooks['LoadExtensionSchemaUpdates'] : array();
1498
1499                 // Unset everyone else's hooks. Lord knows what someone might be doing
1500                 // in ParserFirstCallInit (see bug 27171)
1501                 $GLOBALS['wgHooks'] = array( 'LoadExtensionSchemaUpdates' => $hooksWeWant );
1502
1503                 return Status::newGood();
1504         }
1505
1506         /**
1507          * Get an array of install steps. Should always be in the format of
1508          * array(
1509          *   'name'     => 'someuniquename',
1510          *   'callback' => array( $obj, 'method' ),
1511          * )
1512          * There must be a config-install-$name message defined per step, which will
1513          * be shown on install.
1514          *
1515          * @param DatabaseInstaller $installer DatabaseInstaller so we can make callbacks
1516          * @return array
1517          */
1518         protected function getInstallSteps( DatabaseInstaller $installer ) {
1519                 $coreInstallSteps = array(
1520                         array( 'name' => 'database', 'callback' => array( $installer, 'setupDatabase' ) ),
1521                         array( 'name' => 'tables', 'callback' => array( $installer, 'createTables' ) ),
1522                         array( 'name' => 'interwiki', 'callback' => array( $installer, 'populateInterwikiTable' ) ),
1523                         array( 'name' => 'stats', 'callback' => array( $this, 'populateSiteStats' ) ),
1524                         array( 'name' => 'keys', 'callback' => array( $this, 'generateKeys' ) ),
1525                         array( 'name' => 'sysop', 'callback' => array( $this, 'createSysop' ) ),
1526                         array( 'name' => 'mainpage', 'callback' => array( $this, 'createMainpage' ) ),
1527                 );
1528
1529                 // Build the array of install steps starting from the core install list,
1530                 // then adding any callbacks that wanted to attach after a given step
1531                 foreach ( $coreInstallSteps as $step ) {
1532                         $this->installSteps[] = $step;
1533                         if ( isset( $this->extraInstallSteps[$step['name']] ) ) {
1534                                 $this->installSteps = array_merge(
1535                                         $this->installSteps,
1536                                         $this->extraInstallSteps[$step['name']]
1537                                 );
1538                         }
1539                 }
1540
1541                 // Prepend any steps that want to be at the beginning
1542                 if ( isset( $this->extraInstallSteps['BEGINNING'] ) ) {
1543                         $this->installSteps = array_merge(
1544                                 $this->extraInstallSteps['BEGINNING'],
1545                                 $this->installSteps
1546                         );
1547                 }
1548
1549                 // Extensions should always go first, chance to tie into hooks and such
1550                 if ( count( $this->getVar( '_Extensions' ) ) ) {
1551                         array_unshift( $this->installSteps,
1552                                 array( 'name' => 'extensions', 'callback' => array( $this, 'includeExtensions' ) )
1553                         );
1554                         $this->installSteps[] = array(
1555                                 'name' => 'extension-tables',
1556                                 'callback' => array( $installer, 'createExtensionTables' )
1557                         );
1558                 }
1559
1560                 return $this->installSteps;
1561         }
1562
1563         /**
1564          * Actually perform the installation.
1565          *
1566          * @param callable $startCB A callback array for the beginning of each step
1567          * @param callable $endCB A callback array for the end of each step
1568          *
1569          * @return array Array of Status objects
1570          */
1571         public function performInstallation( $startCB, $endCB ) {
1572                 $installResults = array();
1573                 $installer = $this->getDBInstaller();
1574                 $installer->preInstall();
1575                 $steps = $this->getInstallSteps( $installer );
1576                 foreach ( $steps as $stepObj ) {
1577                         $name = $stepObj['name'];
1578                         call_user_func_array( $startCB, array( $name ) );
1579
1580                         // Perform the callback step
1581                         $status = call_user_func( $stepObj['callback'], $installer );
1582
1583                         // Output and save the results
1584                         call_user_func( $endCB, $name, $status );
1585                         $installResults[$name] = $status;
1586
1587                         // If we've hit some sort of fatal, we need to bail.
1588                         // Callback already had a chance to do output above.
1589                         if ( !$status->isOk() ) {
1590                                 break;
1591                         }
1592                 }
1593                 if ( $status->isOk() ) {
1594                         $this->setVar( '_InstallDone', true );
1595                 }
1596
1597                 return $installResults;
1598         }
1599
1600         /**
1601          * Generate $wgSecretKey. Will warn if we had to use an insecure random source.
1602          *
1603          * @return Status
1604          */
1605         public function generateKeys() {
1606                 $keys = array( 'wgSecretKey' => 64 );
1607                 if ( strval( $this->getVar( 'wgUpgradeKey' ) ) === '' ) {
1608                         $keys['wgUpgradeKey'] = 16;
1609                 }
1610
1611                 return $this->doGenerateKeys( $keys );
1612         }
1613
1614         /**
1615          * Generate a secret value for variables using our CryptRand generator.
1616          * Produce a warning if the random source was insecure.
1617          *
1618          * @param array $keys
1619          * @return Status
1620          */
1621         protected function doGenerateKeys( $keys ) {
1622                 $status = Status::newGood();
1623
1624                 $strong = true;
1625                 foreach ( $keys as $name => $length ) {
1626                         $secretKey = MWCryptRand::generateHex( $length, true );
1627                         if ( !MWCryptRand::wasStrong() ) {
1628                                 $strong = false;
1629                         }
1630
1631                         $this->setVar( $name, $secretKey );
1632                 }
1633
1634                 if ( !$strong ) {
1635                         $names = array_keys( $keys );
1636                         $names = preg_replace( '/^(.*)$/', '\$$1', $names );
1637                         global $wgLang;
1638                         $status->warning( 'config-insecure-keys', $wgLang->listToText( $names ), count( $names ) );
1639                 }
1640
1641                 return $status;
1642         }
1643
1644         /**
1645          * Create the first user account, grant it sysop and bureaucrat rights
1646          *
1647          * @return Status
1648          */
1649         protected function createSysop() {
1650                 $name = $this->getVar( '_AdminName' );
1651                 $user = User::newFromName( $name );
1652
1653                 if ( !$user ) {
1654                         // We should've validated this earlier anyway!
1655                         return Status::newFatal( 'config-admin-error-user', $name );
1656                 }
1657
1658                 if ( $user->idForName() == 0 ) {
1659                         $user->addToDatabase();
1660
1661                         try {
1662                                 $user->setPassword( $this->getVar( '_AdminPassword' ) );
1663                         } catch ( PasswordError $pwe ) {
1664                                 return Status::newFatal( 'config-admin-error-password', $name, $pwe->getMessage() );
1665                         }
1666
1667                         $user->addGroup( 'sysop' );
1668                         $user->addGroup( 'bureaucrat' );
1669                         if ( $this->getVar( '_AdminEmail' ) ) {
1670                                 $user->setEmail( $this->getVar( '_AdminEmail' ) );
1671                         }
1672                         $user->saveSettings();
1673
1674                         // Update user count
1675                         $ssUpdate = new SiteStatsUpdate( 0, 0, 0, 0, 1 );
1676                         $ssUpdate->doUpdate();
1677                 }
1678                 $status = Status::newGood();
1679
1680                 if ( $this->getVar( '_Subscribe' ) && $this->getVar( '_AdminEmail' ) ) {
1681                         $this->subscribeToMediaWikiAnnounce( $status );
1682                 }
1683
1684                 return $status;
1685         }
1686
1687         /**
1688          * @param Status $s
1689          */
1690         private function subscribeToMediaWikiAnnounce( Status $s ) {
1691                 $params = array(
1692                         'email' => $this->getVar( '_AdminEmail' ),
1693                         'language' => 'en',
1694                         'digest' => 0
1695                 );
1696
1697                 // Mailman doesn't support as many languages as we do, so check to make
1698                 // sure their selected language is available
1699                 $myLang = $this->getVar( '_UserLang' );
1700                 if ( in_array( $myLang, $this->mediaWikiAnnounceLanguages ) ) {
1701                         $myLang = $myLang == 'pt-br' ? 'pt_BR' : $myLang; // rewrite to Mailman's pt_BR
1702                         $params['language'] = $myLang;
1703                 }
1704
1705                 if ( MWHttpRequest::canMakeRequests() ) {
1706                         $res = MWHttpRequest::factory( $this->mediaWikiAnnounceUrl,
1707                                 array( 'method' => 'POST', 'postData' => $params ) )->execute();
1708                         if ( !$res->isOK() ) {
1709                                 $s->warning( 'config-install-subscribe-fail', $res->getMessage() );
1710                         }
1711                 } else {
1712                         $s->warning( 'config-install-subscribe-notpossible' );
1713                 }
1714         }
1715
1716         /**
1717          * Insert Main Page with default content.
1718          *
1719          * @param DatabaseInstaller $installer
1720          * @return Status
1721          */
1722         protected function createMainpage( DatabaseInstaller $installer ) {
1723                 $status = Status::newGood();
1724                 try {
1725                         $page = WikiPage::factory( Title::newMainPage() );
1726                         $content = new WikitextContent(
1727                                 wfMessage( 'mainpagetext' )->inContentLanguage()->text() . "\n\n" .
1728                                 wfMessage( 'mainpagedocfooter' )->inContentLanguage()->text()
1729                         );
1730
1731                         $page->doEditContent( $content,
1732                                 '',
1733                                 EDIT_NEW,
1734                                 false,
1735                                 User::newFromName( 'MediaWiki default' )
1736                         );
1737                 } catch ( MWException $e ) {
1738                         //using raw, because $wgShowExceptionDetails can not be set yet
1739                         $status->fatal( 'config-install-mainpage-failed', $e->getMessage() );
1740                 }
1741
1742                 return $status;
1743         }
1744
1745         /**
1746          * Override the necessary bits of the config to run an installation.
1747          */
1748         public static function overrideConfig() {
1749                 define( 'MW_NO_SESSION', 1 );
1750
1751                 // Don't access the database
1752                 $GLOBALS['wgUseDatabaseMessages'] = false;
1753                 // Don't cache langconv tables
1754                 $GLOBALS['wgLanguageConverterCacheType'] = CACHE_NONE;
1755                 // Debug-friendly
1756                 $GLOBALS['wgShowExceptionDetails'] = true;
1757                 // Don't break forms
1758                 $GLOBALS['wgExternalLinkTarget'] = '_blank';
1759
1760                 // Extended debugging
1761                 $GLOBALS['wgShowSQLErrors'] = true;
1762                 $GLOBALS['wgShowDBErrorBacktrace'] = true;
1763
1764                 // Allow multiple ob_flush() calls
1765                 $GLOBALS['wgDisableOutputCompression'] = true;
1766
1767                 // Use a sensible cookie prefix (not my_wiki)
1768                 $GLOBALS['wgCookiePrefix'] = 'mw_installer';
1769
1770                 // Some of the environment checks make shell requests, remove limits
1771                 $GLOBALS['wgMaxShellMemory'] = 0;
1772
1773                 // Don't bother embedding images into generated CSS, which is not cached
1774                 $GLOBALS['wgResourceLoaderLESSFunctions']['embeddable'] = function ( $frame, $less ) {
1775                         return $less->toBool( false );
1776                 };
1777         }
1778
1779         /**
1780          * Add an installation step following the given step.
1781          *
1782          * @param callable $callback A valid installation callback array, in this form:
1783          *    array( 'name' => 'some-unique-name', 'callback' => array( $obj, 'function' ) );
1784          * @param string $findStep The step to find. Omit to put the step at the beginning
1785          */
1786         public function addInstallStep( $callback, $findStep = 'BEGINNING' ) {
1787                 $this->extraInstallSteps[$findStep][] = $callback;
1788         }
1789
1790         /**
1791          * Disable the time limit for execution.
1792          * Some long-running pages (Install, Upgrade) will want to do this
1793          */
1794         protected function disableTimeLimit() {
1795                 wfSuppressWarnings();
1796                 set_time_limit( 0 );
1797                 wfRestoreWarnings();
1798         }
1799 }