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 $licenses = array(
 287                 'cc-by' => array(
 288                         'url' => 'http://creativecommons.org/licenses/by/3.0/',
 289                         'icon' => '{$wgResourceBasePath}/resources/assets/licenses/cc-by.png',
 290                 ),
 291                 'cc-by-sa' => array(
 292                         'url' => 'http://creativecommons.org/licenses/by-sa/3.0/',
 293                         'icon' => '{$wgResourceBasePath}/resources/assets/licenses/cc-by-sa.png',
 294                 ),
 295                 'cc-by-nc-sa' => array(
 296                         'url' => 'http://creativecommons.org/licenses/by-nc-sa/3.0/',
 297                         'icon' => '{$wgResourceBasePath}/resources/assets/licenses/cc-by-nc-sa.png',
 298                 ),
 299                 'cc-0' => array(
 300                         'url' => 'https://creativecommons.org/publicdomain/zero/1.0/',
 301                         'icon' => '{$wgResourceBasePath}/resources/assets/licenses/cc-0.png',
 302                 ),
 303                 'pd' => array(
 304                         'url' => '',
 305                         'icon' => '{$wgResourceBasePath}/resources/assets/licenses/public-domain.png',
 306                 ),
 307                 'gfdl' => array(
 308                         'url' => 'http://www.gnu.org/copyleft/fdl.html',
 309                         'icon' => '{$wgResourceBasePath}/resources/assets/licenses/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                 $wgAutoloadClasses = array();
 543
 544                 wfSuppressWarnings();
 545                 $_lsExists = file_exists( "$IP/LocalSettings.php" );
 546                 wfRestoreWarnings();
 547
 548                 if ( !$_lsExists ) {
 549                         return false;
 550                 }
 551                 unset( $_lsExists );
 552
 553                 require "$IP/includes/DefaultSettings.php";
 554                 require "$IP/LocalSettings.php";
 555
 556                 return get_defined_vars();
 557         }
 558
 559         /**
 560          * Get a fake password for sending back to the user in HTML.
 561          * This is a security mechanism to avoid compromise of the password in the
 562          * event of session ID compromise.
 563          *
 564          * @param string $realPassword
 565          *
 566          * @return string
 567          */
 568         public function getFakePassword( $realPassword ) {
 569                 return str_repeat( '*', strlen( $realPassword ) );
 570         }
 571
 572         /**
 573          * Set a variable which stores a password, except if the new value is a
 574          * fake password in which case leave it as it is.
 575          *
 576          * @param string $name
 577          * @param mixed $value
 578          */
 579         public function setPassword( $name, $value ) {
 580                 if ( !preg_match( '/^\*+$/', $value ) ) {
 581                         $this->setVar( $name, $value );
 582                 }
 583         }
 584
 585         /**
 586          * On POSIX systems return the primary group of the webserver we're running under.
 587          * On other systems just returns null.
 588          *
 589          * This is used to advice the user that he should chgrp his mw-config/data/images directory as the
 590          * webserver user before he can install.
 591          *
 592          * Public because SqliteInstaller needs it, and doesn't subclass Installer.
 593          *
 594          * @return mixed
 595          */
 596         public static function maybeGetWebserverPrimaryGroup() {
 597                 if ( !function_exists( 'posix_getegid' ) || !function_exists( 'posix_getpwuid' ) ) {
 598                         # I don't know this, this isn't UNIX.
 599                         return null;
 600                 }
 601
 602                 # posix_getegid() *not* getmygid() because we want the group of the webserver,
 603                 # not whoever owns the current script.
 604                 $gid = posix_getegid();
 605                 $getpwuid = posix_getpwuid( $gid );
 606                 $group = $getpwuid['name'];
 607
 608                 return $group;
 609         }
 610
 611         /**
 612          * Convert wikitext $text to HTML.
 613          *
 614          * This is potentially error prone since many parser features require a complete
 615          * installed MW database. The solution is to just not use those features when you
 616          * write your messages. This appears to work well enough. Basic formatting and
 617          * external links work just fine.
 618          *
 619          * But in case a translator decides to throw in a "#ifexist" or internal link or
 620          * whatever, this function is guarded to catch the attempted DB access and to present
 621          * some fallback text.
 622          *
 623          * @param string $text
 624          * @param bool $lineStart
 625          * @return string
 626          */
 627         public function parse( $text, $lineStart = false ) {
 628                 global $wgParser;
 629
 630                 try {
 631                         $out = $wgParser->parse( $text, $this->parserTitle, $this->parserOptions, $lineStart );
 632                         $html = $out->getText();
 633                 } catch ( DBAccessError $e ) {
 634                         $html = '<!--DB access attempted during parse-->  ' . htmlspecialchars( $text );
 635
 636                         if ( !empty( $this->debug ) ) {
 637                                 $html .= "<!--\n" . $e->getTraceAsString() . "\n-->";
 638                         }
 639                 }
 640
 641                 return $html;
 642         }
 643
 644         /**
 645          * @return ParserOptions
 646          */
 647         public function getParserOptions() {
 648                 return $this->parserOptions;
 649         }
 650
 651         public function disableLinkPopups() {
 652                 $this->parserOptions->setExternalLinkTarget( false );
 653         }
 654
 655         public function restoreLinkPopups() {
 656                 global $wgExternalLinkTarget;
 657                 $this->parserOptions->setExternalLinkTarget( $wgExternalLinkTarget );
 658         }
 659
 660         /**
 661          * Install step which adds a row to the site_stats table with appropriate
 662          * initial values.
 663          *
 664          * @param DatabaseInstaller $installer
 665          *
 666          * @return Status
 667          */
 668         public function populateSiteStats( DatabaseInstaller $installer ) {
 669                 $status = $installer->getConnection();
 670                 if ( !$status->isOK() ) {
 671                         return $status;
 672                 }
 673                 $status->value->insert(
 674                         'site_stats',
 675                         array(
 676                                 'ss_row_id' => 1,
 677                                 'ss_total_views' => 0,
 678                                 'ss_total_edits' => 0,
 679                                 'ss_good_articles' => 0,
 680                                 'ss_total_pages' => 0,
 681                                 'ss_users' => 0,
 682                                 'ss_images' => 0
 683                         ),
 684                         __METHOD__, 'IGNORE'
 685                 );
 686
 687                 return Status::newGood();
 688         }
 689
 690         /**
 691          * Exports all wg* variables stored by the installer into global scope.
 692          */
 693         public function exportVars() {
 694                 foreach ( $this->settings as $name => $value ) {
 695                         if ( substr( $name, 0, 2 ) == 'wg' ) {
 696                                 $GLOBALS[$name] = $value;
 697                         }
 698                 }
 699         }
 700
 701         /**
 702          * Environment check for DB types.
 703          * @return bool
 704          */
 705         protected function envCheckDB() {
 706                 global $wgLang;
 707
 708                 $allNames = array();
 709
 710                 // Messages: config-type-mysql, config-type-postgres, config-type-oracle,
 711                 // config-type-sqlite
 712                 foreach ( self::getDBTypes() as $name ) {
 713                         $allNames[] = wfMessage( "config-type-$name" )->text();
 714                 }
 715
 716                 $databases = $this->getCompiledDBs();
 717
 718                 $databases = array_flip( $databases );
 719                 foreach ( array_keys( $databases ) as $db ) {
 720                         $installer = $this->getDBInstaller( $db );
 721                         $status = $installer->checkPrerequisites();
 722                         if ( !$status->isGood() ) {
 723                                 $this->showStatusMessage( $status );
 724                         }
 725                         if ( !$status->isOK() ) {
 726                                 unset( $databases[$db] );
 727                         }
 728                 }
 729                 $databases = array_flip( $databases );
 730                 if ( !$databases ) {
 731                         $this->showError( 'config-no-db', $wgLang->commaList( $allNames ) );
 732
 733                         // @todo FIXME: This only works for the web installer!
 734                         return false;
 735                 }
 736
 737                 return true;
 738         }
 739
 740         /**
 741          * Environment check for register_globals.
 742          * Prevent installation if enabled
 743          * @return bool
 744          */
 745         protected function envCheckRegisterGlobals() {
 746                 if ( wfIniGetBool( 'register_globals' ) ) {
 747                         $this->showMessage( 'config-register-globals-error' );
 748                         return false;
 749                 }
 750
 751                 return true;
 752         }
 753
 754         /**
 755          * Some versions of libxml+PHP break < and > encoding horribly
 756          * @return bool
 757          */
 758         protected function envCheckBrokenXML() {
 759                 $test = new PhpXmlBugTester();
 760                 if ( !$test->ok ) {
 761                         $this->showError( 'config-brokenlibxml' );
 762
 763                         return false;
 764                 }
 765
 766                 return true;
 767         }
 768
 769         /**
 770          * Environment check for magic_quotes_(gpc|runtime|sybase).
 771          * @return bool
 772          */
 773         protected function envCheckMagicQuotes() {
 774                 $status = true;
 775                 foreach ( array( 'gpc', 'runtime', 'sybase' ) as $magicJunk ) {
 776                         if ( wfIniGetBool( "magic_quotes_$magicJunk" ) ) {
 777                                 $this->showError( "config-magic-quotes-$magicJunk" );
 778                                 $status = false;
 779                         }
 780                 }
 781
 782                 return $status;
 783         }
 784
 785         /**
 786          * Environment check for mbstring.func_overload.
 787          * @return bool
 788          */
 789         protected function envCheckMbstring() {
 790                 if ( wfIniGetBool( 'mbstring.func_overload' ) ) {
 791                         $this->showError( 'config-mbstring' );
 792
 793                         return false;
 794                 }
 795
 796                 return true;
 797         }
 798
 799         /**
 800          * Environment check for safe_mode.
 801          * @return bool
 802          */
 803         protected function envCheckSafeMode() {
 804                 if ( wfIniGetBool( 'safe_mode' ) ) {
 805                         $this->setVar( '_SafeMode', true );
 806                         $this->showMessage( 'config-safe-mode' );
 807                 }
 808
 809                 return true;
 810         }
 811
 812         /**
 813          * Environment check for the XML module.
 814          * @return bool
 815          */
 816         protected function envCheckXML() {
 817                 if ( !function_exists( "utf8_encode" ) ) {
 818                         $this->showError( 'config-xml-bad' );
 819
 820                         return false;
 821                 }
 822
 823                 return true;
 824         }
 825
 826         /**
 827          * Environment check for the PCRE module.
 828          *
 829          * @note If this check were to fail, the parser would
 830          *   probably throw an exception before the result
 831          *   of this check is shown to the user.
 832          * @return bool
 833          */
 834         protected function envCheckPCRE() {
 835                 wfSuppressWarnings();
 836                 $regexd = preg_replace( '/[\x{0430}-\x{04FF}]/iu', '', '-АБВГД-' );
 837                 // Need to check for \p support too, as PCRE can be compiled
 838                 // with utf8 support, but not unicode property support.
 839                 // check that \p{Zs} (space separators) matches
 840                 // U+3000 (Ideographic space)
 841                 $regexprop = preg_replace( '/\p{Zs}/u', '', "-\xE3\x80\x80-" );
 842                 wfRestoreWarnings();
 843                 if ( $regexd != '--' || $regexprop != '--' ) {
 844                         $this->showError( 'config-pcre-no-utf8' );
 845
 846                         return false;
 847                 }
 848
 849                 return true;
 850         }
 851
 852         /**
 853          * Environment check for available memory.
 854          * @return bool
 855          */
 856         protected function envCheckMemory() {
 857                 $limit = ini_get( 'memory_limit' );
 858
 859                 if ( !$limit || $limit == -1 ) {
 860                         return true;
 861                 }
 862
 863                 $n = wfShorthandToInteger( $limit );
 864
 865                 if ( $n < $this->minMemorySize * 1024 * 1024 ) {
 866                         $newLimit = "{$this->minMemorySize}M";
 867
 868                         if ( ini_set( "memory_limit", $newLimit ) === false ) {
 869                                 $this->showMessage( 'config-memory-bad', $limit );
 870                         } else {
 871                                 $this->showMessage( 'config-memory-raised', $limit, $newLimit );
 872                                 $this->setVar( '_RaiseMemory', true );
 873                         }
 874                 }
 875
 876                 return true;
 877         }
 878
 879         /**
 880          * Environment check for compiled object cache types.
 881          */
 882         protected function envCheckCache() {
 883                 $caches = array();
 884                 foreach ( $this->objectCaches as $name => $function ) {
 885                         if ( function_exists( $function ) ) {
 886                                 if ( $name == 'xcache' && !wfIniGetBool( 'xcache.var_size' ) ) {
 887                                         continue;
 888                                 }
 889                                 $caches[$name] = true;
 890                         }
 891                 }
 892
 893                 if ( !$caches ) {
 894                         $this->showMessage( 'config-no-cache' );
 895                 }
 896
 897                 $this->setVar( '_Caches', $caches );
 898         }
 899
 900         /**
 901          * Scare user to death if they have mod_security
 902          * @return bool
 903          */
 904         protected function envCheckModSecurity() {
 905                 if ( self::apacheModulePresent( 'mod_security' ) ) {
 906                         $this->showMessage( 'config-mod-security' );
 907                 }
 908
 909                 return true;
 910         }
 911
 912         /**
 913          * Search for GNU diff3.
 914          * @return bool
 915          */
 916         protected function envCheckDiff3() {
 917                 $names = array( "gdiff3", "diff3", "diff3.exe" );
 918                 $versionInfo = array( '$1 --version 2>&1', 'GNU diffutils' );
 919
 920                 $diff3 = self::locateExecutableInDefaultPaths( $names, $versionInfo );
 921
 922                 if ( $diff3 ) {
 923                         $this->setVar( 'wgDiff3', $diff3 );
 924                 } else {
 925                         $this->setVar( 'wgDiff3', false );
 926                         $this->showMessage( 'config-diff3-bad' );
 927                 }
 928
 929                 return true;
 930         }
 931
 932         /**
 933          * Environment check for ImageMagick and GD.
 934          * @return bool
 935          */
 936         protected function envCheckGraphics() {
 937                 $names = array( wfIsWindows() ? 'convert.exe' : 'convert' );
 938                 $versionInfo = array( '$1 -version', 'ImageMagick' );
 939                 $convert = self::locateExecutableInDefaultPaths( $names, $versionInfo );
 940
 941                 $this->setVar( 'wgImageMagickConvertCommand', '' );
 942                 if ( $convert ) {
 943                         $this->setVar( 'wgImageMagickConvertCommand', $convert );
 944                         $this->showMessage( 'config-imagemagick', $convert );
 945
 946                         return true;
 947                 } elseif ( function_exists( 'imagejpeg' ) ) {
 948                         $this->showMessage( 'config-gd' );
 949                 } else {
 950                         $this->showMessage( 'config-no-scaling' );
 951                 }
 952
 953                 return true;
 954         }
 955
 956         /**
 957          * Search for git.
 958          *
 959          * @since 1.22
 960          * @return bool
 961          */
 962         protected function envCheckGit() {
 963                 $names = array( wfIsWindows() ? 'git.exe' : 'git' );
 964                 $versionInfo = array( '$1 --version', 'git version' );
 965
 966                 $git = self::locateExecutableInDefaultPaths( $names, $versionInfo );
 967
 968                 if ( $git ) {
 969                         $this->setVar( 'wgGitBin', $git );
 970                         $this->showMessage( 'config-git', $git );
 971                 } else {
 972                         $this->setVar( 'wgGitBin', false );
 973                         $this->showMessage( 'config-git-bad' );
 974                 }
 975
 976                 return true;
 977         }
 978
 979         /**
 980          * Environment check to inform user which server we've assumed.
 981          *
 982          * @return bool
 983          */
 984         protected function envCheckServer() {
 985                 $server = $this->envGetDefaultServer();
 986                 if ( $server !== null ) {
 987                         $this->showMessage( 'config-using-server', $server );
 988                 }
 989                 return true;
 990         }
 991
 992         /**
 993          * Environment check to inform user which paths we've assumed.
 994          *
 995          * @return bool
 996          */
 997         protected function envCheckPath() {
 998                 $this->showMessage(
 999                         'config-using-uri',
1000                         $this->getVar( 'wgServer' ),
1001                         $this->getVar( 'wgScriptPath' )
1002                 );
1003                 return true;
1004         }
1005
1006         /**
1007          * Environment check for preferred locale in shell
1008          * @return bool
1009          */
1010         protected function envCheckShellLocale() {
1011                 $os = php_uname( 's' );
1012                 $supported = array( 'Linux', 'SunOS', 'HP-UX', 'Darwin' ); # Tested these
1013
1014                 if ( !in_array( $os, $supported ) ) {
1015                         return true;
1016                 }
1017
1018                 # Get a list of available locales.
1019                 $ret = false;
1020                 $lines = wfShellExec( '/usr/bin/locale -a', $ret );
1021
1022                 if ( $ret ) {
1023                         return true;
1024                 }
1025
1026                 $lines = array_map( 'trim', explode( "\n", $lines ) );
1027                 $candidatesByLocale = array();
1028                 $candidatesByLang = array();
1029
1030                 foreach ( $lines as $line ) {
1031                         if ( $line === '' ) {
1032                                 continue;
1033                         }
1034
1035                         if ( !preg_match( '/^([a-zA-Z]+)(_[a-zA-Z]+|)\.(utf8|UTF-8)(@[a-zA-Z_]*|)$/i', $line, $m ) ) {
1036                                 continue;
1037                         }
1038
1039                         list( , $lang, , , ) = $m;
1040
1041                         $candidatesByLocale[$m[0]] = $m;
1042                         $candidatesByLang[$lang][] = $m;
1043                 }
1044
1045                 # Try the current value of LANG.
1046                 if ( isset( $candidatesByLocale[getenv( 'LANG' )] ) ) {
1047                         $this->setVar( 'wgShellLocale', getenv( 'LANG' ) );
1048
1049                         return true;
1050                 }
1051
1052                 # Try the most common ones.
1053                 $commonLocales = array( 'en_US.UTF-8', 'en_US.utf8', 'de_DE.UTF-8', 'de_DE.utf8' );
1054                 foreach ( $commonLocales as $commonLocale ) {
1055                         if ( isset( $candidatesByLocale[$commonLocale] ) ) {
1056                                 $this->setVar( 'wgShellLocale', $commonLocale );
1057
1058                                 return true;
1059                         }
1060                 }
1061
1062                 # Is there an available locale in the Wiki's language?
1063                 $wikiLang = $this->getVar( 'wgLanguageCode' );
1064
1065                 if ( isset( $candidatesByLang[$wikiLang] ) ) {
1066                         $m = reset( $candidatesByLang[$wikiLang] );
1067                         $this->setVar( 'wgShellLocale', $m[0] );
1068
1069                         return true;
1070                 }
1071
1072                 # Are there any at all?
1073                 if ( count( $candidatesByLocale ) ) {
1074                         $m = reset( $candidatesByLocale );
1075                         $this->setVar( 'wgShellLocale', $m[0] );
1076
1077                         return true;
1078                 }
1079
1080                 # Give up.
1081                 return true;
1082         }
1083
1084         /**
1085          * Environment check for the permissions of the uploads directory
1086          * @return bool
1087          */
1088         protected function envCheckUploadsDirectory() {
1089                 global $IP;
1090
1091                 $dir = $IP . '/images/';
1092                 $url = $this->getVar( 'wgServer' ) . $this->getVar( 'wgScriptPath' ) . '/images/';
1093                 $safe = !$this->dirIsExecutable( $dir, $url );
1094
1095                 if ( !$safe ) {
1096                         $this->showMessage( 'config-uploads-not-safe', $dir );
1097                 }
1098
1099                 return true;
1100         }
1101
1102         /**
1103          * Checks if suhosin.get.max_value_length is set, and if so generate
1104          * a warning because it decreases ResourceLoader performance.
1105          * @return bool
1106          */
1107         protected function envCheckSuhosinMaxValueLength() {
1108                 $maxValueLength = ini_get( 'suhosin.get.max_value_length' );
1109                 if ( $maxValueLength > 0 && $maxValueLength < 1024 ) {
1110                         // Only warn if the value is below the sane 1024
1111                         $this->showMessage( 'config-suhosin-max-value-length', $maxValueLength );
1112                 }
1113
1114                 return true;
1115         }
1116
1117         /**
1118          * Convert a hex string representing a Unicode code point to that code point.
1119          * @param string $c
1120          * @return string
1121          */
1122         protected function unicodeChar( $c ) {
1123                 $c = hexdec( $c );
1124                 if ( $c <= 0x7F ) {
1125                         return chr( $c );
1126                 } elseif ( $c <= 0x7FF ) {
1127                         return chr( 0xC0 | $c >> 6 ) . chr( 0x80 | $c & 0x3F );
1128                 } elseif ( $c <= 0xFFFF ) {
1129                         return chr( 0xE0 | $c >> 12 ) . chr( 0x80 | $c >> 6 & 0x3F )
1130                         . chr( 0x80 | $c & 0x3F );
1131                 } elseif ( $c <= 0x10FFFF ) {
1132                         return chr( 0xF0 | $c >> 18 ) . chr( 0x80 | $c >> 12 & 0x3F )
1133                         . chr( 0x80 | $c >> 6 & 0x3F )
1134                         . chr( 0x80 | $c & 0x3F );
1135                 } else {
1136                         return false;
1137                 }
1138         }
1139
1140         /**
1141          * Check the libicu version
1142          */
1143         protected function envCheckLibicu() {
1144                 $utf8 = function_exists( 'utf8_normalize' );
1145                 $intl = function_exists( 'normalizer_normalize' );
1146
1147                 /**
1148                  * This needs to be updated something that the latest libicu
1149                  * will properly normalize.  This normalization was found at
1150                  * http://www.unicode.org/versions/Unicode5.2.0/#Character_Additions
1151                  * Note that we use the hex representation to create the code
1152                  * points in order to avoid any Unicode-destroying during transit.
1153                  */
1154                 $not_normal_c = $this->unicodeChar( "FA6C" );
1155                 $normal_c = $this->unicodeChar( "242EE" );
1156
1157                 $useNormalizer = 'php';
1158                 $needsUpdate = false;
1159
1160                 /**
1161                  * We're going to prefer the pecl extension here unless
1162                  * utf8_normalize is more up to date.
1163                  */
1164                 if ( $utf8 ) {
1165                         $useNormalizer = 'utf8';
1166                         $utf8 = utf8_normalize( $not_normal_c, UtfNormal::UNORM_NFC );
1167                         if ( $utf8 !== $normal_c ) {
1168                                 $needsUpdate = true;
1169                         }
1170                 }
1171                 if ( $intl ) {
1172                         $useNormalizer = 'intl';
1173                         $intl = normalizer_normalize( $not_normal_c, Normalizer::FORM_C );
1174                         if ( $intl !== $normal_c ) {
1175                                 $needsUpdate = true;
1176                         }
1177                 }
1178
1179                 // Uses messages 'config-unicode-using-php', 'config-unicode-using-utf8',
1180                 // 'config-unicode-using-intl'
1181                 if ( $useNormalizer === 'php' ) {
1182                         $this->showMessage( 'config-unicode-pure-php-warning' );
1183                 } else {
1184                         $this->showMessage( 'config-unicode-using-' . $useNormalizer );
1185                         if ( $needsUpdate ) {
1186                                 $this->showMessage( 'config-unicode-update-warning' );
1187                         }
1188                 }
1189         }
1190
1191         /**
1192          * @return bool
1193          */
1194         protected function envCheckCtype() {
1195                 if ( !function_exists( 'ctype_digit' ) ) {
1196                         $this->showError( 'config-ctype' );
1197
1198                         return false;
1199                 }
1200
1201                 return true;
1202         }
1203
1204         /**
1205          * @return bool
1206          */
1207         protected function envCheckIconv() {
1208                 if ( !function_exists( 'iconv' ) ) {
1209                         $this->showError( 'config-iconv' );
1210
1211                         return false;
1212                 }
1213
1214                 return true;
1215         }
1216
1217         /**
1218          * @return bool
1219          */
1220         protected function envCheckJSON() {
1221                 if ( !function_exists( 'json_decode' ) ) {
1222                         $this->showError( 'config-json' );
1223
1224                         return false;
1225                 }
1226
1227                 return true;
1228         }
1229
1230         /**
1231          * Environment prep for the server hostname.
1232          */
1233         protected function envPrepServer() {
1234                 $server = $this->envGetDefaultServer();
1235                 if ( $server !== null ) {
1236                         $this->setVar( 'wgServer', $server );
1237                 }
1238         }
1239
1240         /**
1241          * Helper function to be called from envPrepServer()
1242          * @return string
1243          */
1244         abstract protected function envGetDefaultServer();
1245
1246         /**
1247          * Environment prep for setting the preferred PHP file extension.
1248          */
1249         protected function envPrepExtension() {
1250                 // @todo FIXME: Detect this properly
1251                 if ( defined( 'MW_INSTALL_PHP5_EXT' ) ) {
1252                         $ext = '.php5';
1253                 } else {
1254                         $ext = '.php';
1255                 }
1256                 $this->setVar( 'wgScriptExtension', $ext );
1257         }
1258
1259         /**
1260          * Environment prep for setting $IP and $wgScriptPath.
1261          */
1262         protected function envPrepPath() {
1263                 global $IP;
1264                 $IP = dirname( dirname( __DIR__ ) );
1265                 $this->setVar( 'IP', $IP );
1266         }
1267
1268         /**
1269          * Get an array of likely places we can find executables. Check a bunch
1270          * of known Unix-like defaults, as well as the PATH environment variable
1271          * (which should maybe make it work for Windows?)
1272          *
1273          * @return array
1274          */
1275         protected static function getPossibleBinPaths() {
1276                 return array_merge(
1277                         array( '/usr/bin', '/usr/local/bin', '/opt/csw/bin',
1278                                 '/usr/gnu/bin', '/usr/sfw/bin', '/sw/bin', '/opt/local/bin' ),
1279                         explode( PATH_SEPARATOR, getenv( 'PATH' ) )
1280                 );
1281         }
1282
1283         /**
1284          * Search a path for any of the given executable names. Returns the
1285          * executable name if found. Also checks the version string returned
1286          * by each executable.
1287          *
1288          * Used only by environment checks.
1289          *
1290          * @param string $path Path to search
1291          * @param array $names Array of executable names
1292          * @param array|bool $versionInfo False or array with two members:
1293          *   0 => Command to run for version check, with $1 for the full executable name
1294          *   1 => String to compare the output with
1295          *
1296          * If $versionInfo is not false, only executables with a version
1297          * matching $versionInfo[1] will be returned.
1298          * @return bool|string
1299          */
1300         public static function locateExecutable( $path, $names, $versionInfo = false ) {
1301                 if ( !is_array( $names ) ) {
1302                         $names = array( $names );
1303                 }
1304
1305                 foreach ( $names as $name ) {
1306                         $command = $path . DIRECTORY_SEPARATOR . $name;
1307
1308                         wfSuppressWarnings();
1309                         $file_exists = file_exists( $command );
1310                         wfRestoreWarnings();
1311
1312                         if ( $file_exists ) {
1313                                 if ( !$versionInfo ) {
1314                                         return $command;
1315                                 }
1316
1317                                 $file = str_replace( '$1', wfEscapeShellArg( $command ), $versionInfo[0] );
1318                                 if ( strstr( wfShellExec( $file ), $versionInfo[1] ) !== false ) {
1319                                         return $command;
1320                                 }
1321                         }
1322                 }
1323
1324                 return false;
1325         }
1326
1327         /**
1328          * Same as locateExecutable(), but checks in getPossibleBinPaths() by default
1329          * @see locateExecutable()
1330          * @param array $names Array of possible names.
1331          * @param array|bool $versionInfo Default: false or array with two members:
1332          *   0 => Command to run for version check, with $1 for the full executable name
1333          *   1 => String to compare the output with
1334          *
1335          * If $versionInfo is not false, only executables with a version
1336          * matching $versionInfo[1] will be returned.
1337          * @return bool|string
1338          */
1339         public static function locateExecutableInDefaultPaths( $names, $versionInfo = false ) {
1340                 foreach ( self::getPossibleBinPaths() as $path ) {
1341                         $exe = self::locateExecutable( $path, $names, $versionInfo );
1342                         if ( $exe !== false ) {
1343                                 return $exe;
1344                         }
1345                 }
1346
1347                 return false;
1348         }
1349
1350         /**
1351          * Checks if scripts located in the given directory can be executed via the given URL.
1352          *
1353          * Used only by environment checks.
1354          * @param string $dir
1355          * @param string $url
1356          * @return bool|int|string
1357          */
1358         public function dirIsExecutable( $dir, $url ) {
1359                 $scriptTypes = array(
1360                         'php' => array(
1361                                 "<?php echo 'ex' . 'ec';",
1362                                 "#!/var/env php5\n<?php echo 'ex' . 'ec';",
1363                         ),
1364                 );
1365
1366                 // it would be good to check other popular languages here, but it'll be slow.
1367
1368                 wfSuppressWarnings();
1369
1370                 foreach ( $scriptTypes as $ext => $contents ) {
1371                         foreach ( $contents as $source ) {
1372                                 $file = 'exectest.' . $ext;
1373
1374                                 if ( !file_put_contents( $dir . $file, $source ) ) {
1375                                         break;
1376                                 }
1377
1378                                 try {
1379                                         $text = Http::get( $url . $file, array( 'timeout' => 3 ) );
1380                                 } catch ( MWException $e ) {
1381                                         // Http::get throws with allow_url_fopen = false and no curl extension.
1382                                         $text = null;
1383                                 }
1384                                 unlink( $dir . $file );
1385
1386                                 if ( $text == 'exec' ) {
1387                                         wfRestoreWarnings();
1388
1389                                         return $ext;
1390                                 }
1391                         }
1392                 }
1393
1394                 wfRestoreWarnings();
1395
1396                 return false;
1397         }
1398
1399         /**
1400          * Checks for presence of an Apache module. Works only if PHP is running as an Apache module, too.
1401          *
1402          * @param string $moduleName Name of module to check.
1403          * @return bool
1404          */
1405         public static function apacheModulePresent( $moduleName ) {
1406                 if ( function_exists( 'apache_get_modules' ) && in_array( $moduleName, apache_get_modules() ) ) {
1407                         return true;
1408                 }
1409                 // try it the hard way
1410                 ob_start();
1411                 phpinfo( INFO_MODULES );
1412                 $info = ob_get_clean();
1413
1414                 return strpos( $info, $moduleName ) !== false;
1415         }
1416
1417         /**
1418          * ParserOptions are constructed before we determined the language, so fix it
1419          *
1420          * @param Language $lang
1421          */
1422         public function setParserLanguage( $lang ) {
1423                 $this->parserOptions->setTargetLanguage( $lang );
1424                 $this->parserOptions->setUserLang( $lang );
1425         }
1426
1427         /**
1428          * Overridden by WebInstaller to provide lastPage parameters.
1429          * @param string $page
1430          * @return string
1431          */
1432         protected function getDocUrl( $page ) {
1433                 return "{$_SERVER['PHP_SELF']}?page=" . urlencode( $page );
1434         }
1435
1436         /**
1437          * Finds extensions that follow the format /$directory/Name/Name.php,
1438          * and returns an array containing the value for 'Name' for each found extension.
1439          *
1440          * Reasonable values for $directory include 'extensions' (the default) and 'skins'.
1441          *
1442          * @param string $directory Directory to search in
1443          * @return array
1444          */
1445         public function findExtensions( $directory = 'extensions' ) {
1446                 if ( $this->getVar( 'IP' ) === null ) {
1447                         return array();
1448                 }
1449
1450                 $extDir = $this->getVar( 'IP' ) . '/' . $directory;
1451                 if ( !is_readable( $extDir ) || !is_dir( $extDir ) ) {
1452                         return array();
1453                 }
1454
1455                 $dh = opendir( $extDir );
1456                 $exts = array();
1457                 while ( ( $file = readdir( $dh ) ) !== false ) {
1458                         if ( !is_dir( "$extDir/$file" ) ) {
1459                                 continue;
1460                         }
1461                         if ( file_exists( "$extDir/$file/$file.php" ) ) {
1462                                 $exts[] = $file;
1463                         }
1464                 }
1465                 closedir( $dh );
1466                 natcasesort( $exts );
1467
1468                 return $exts;
1469         }
1470
1471         /**
1472          * Returns a default value to be used for $wgDefaultSkin: the preferred skin, if available among
1473          * the installed skins, or any other one otherwise.
1474          *
1475          * @param string[] $skinNames Names of installed skins.
1476          * @return string
1477          */
1478         public function getDefaultSkin( array $skinNames ) {
1479                 $defaultSkin = $GLOBALS['wgDefaultSkin'];
1480                 if ( in_array( $defaultSkin, $skinNames ) ) {
1481                         return $defaultSkin;
1482                 } else {
1483                         return $skinNames[0];
1484                 }
1485         }
1486
1487         /**
1488          * Installs the auto-detected extensions.
1489          *
1490          * @return Status
1491          */
1492         protected function includeExtensions() {
1493                 global $IP;
1494                 $exts = $this->getVar( '_Extensions' );
1495                 $IP = $this->getVar( 'IP' );
1496
1497                 /**
1498                  * We need to include DefaultSettings before including extensions to avoid
1499                  * warnings about unset variables. However, the only thing we really
1500                  * want here is $wgHooks['LoadExtensionSchemaUpdates']. This won't work
1501                  * if the extension has hidden hook registration in $wgExtensionFunctions,
1502                  * but we're not opening that can of worms
1503                  * @see https://bugzilla.wikimedia.org/show_bug.cgi?id=26857
1504                  */
1505                 global $wgAutoloadClasses;
1506                 $wgAutoloadClasses = array();
1507
1508                 require "$IP/includes/DefaultSettings.php";
1509
1510                 foreach ( $exts as $e ) {
1511                         require_once "$IP/extensions/$e/$e.php";
1512                 }
1513
1514                 $hooksWeWant = isset( $wgHooks['LoadExtensionSchemaUpdates'] ) ?
1515                         $wgHooks['LoadExtensionSchemaUpdates'] : array();
1516
1517                 // Unset everyone else's hooks. Lord knows what someone might be doing
1518                 // in ParserFirstCallInit (see bug 27171)
1519                 $GLOBALS['wgHooks'] = array( 'LoadExtensionSchemaUpdates' => $hooksWeWant );
1520
1521                 return Status::newGood();
1522         }
1523
1524         /**
1525          * Get an array of install steps. Should always be in the format of
1526          * array(
1527          *   'name'     => 'someuniquename',
1528          *   'callback' => array( $obj, 'method' ),
1529          * )
1530          * There must be a config-install-$name message defined per step, which will
1531          * be shown on install.
1532          *
1533          * @param DatabaseInstaller $installer DatabaseInstaller so we can make callbacks
1534          * @return array
1535          */
1536         protected function getInstallSteps( DatabaseInstaller $installer ) {
1537                 $coreInstallSteps = array(
1538                         array( 'name' => 'database', 'callback' => array( $installer, 'setupDatabase' ) ),
1539                         array( 'name' => 'tables', 'callback' => array( $installer, 'createTables' ) ),
1540                         array( 'name' => 'interwiki', 'callback' => array( $installer, 'populateInterwikiTable' ) ),
1541                         array( 'name' => 'stats', 'callback' => array( $this, 'populateSiteStats' ) ),
1542                         array( 'name' => 'keys', 'callback' => array( $this, 'generateKeys' ) ),
1543                         array( 'name' => 'updates', 'callback' => array( $installer, 'insertUpdateKeys' ) ),
1544                         array( 'name' => 'sysop', 'callback' => array( $this, 'createSysop' ) ),
1545                         array( 'name' => 'mainpage', 'callback' => array( $this, 'createMainpage' ) ),
1546                 );
1547
1548                 // Build the array of install steps starting from the core install list,
1549                 // then adding any callbacks that wanted to attach after a given step
1550                 foreach ( $coreInstallSteps as $step ) {
1551                         $this->installSteps[] = $step;
1552                         if ( isset( $this->extraInstallSteps[$step['name']] ) ) {
1553                                 $this->installSteps = array_merge(
1554                                         $this->installSteps,
1555                                         $this->extraInstallSteps[$step['name']]
1556                                 );
1557                         }
1558                 }
1559
1560                 // Prepend any steps that want to be at the beginning
1561                 if ( isset( $this->extraInstallSteps['BEGINNING'] ) ) {
1562                         $this->installSteps = array_merge(
1563                                 $this->extraInstallSteps['BEGINNING'],
1564                                 $this->installSteps
1565                         );
1566                 }
1567
1568                 // Extensions should always go first, chance to tie into hooks and such
1569                 if ( count( $this->getVar( '_Extensions' ) ) ) {
1570                         array_unshift( $this->installSteps,
1571                                 array( 'name' => 'extensions', 'callback' => array( $this, 'includeExtensions' ) )
1572                         );
1573                         $this->installSteps[] = array(
1574                                 'name' => 'extension-tables',
1575                                 'callback' => array( $installer, 'createExtensionTables' )
1576                         );
1577                 }
1578
1579                 return $this->installSteps;
1580         }
1581
1582         /**
1583          * Actually perform the installation.
1584          *
1585          * @param callable $startCB A callback array for the beginning of each step
1586          * @param callable $endCB A callback array for the end of each step
1587          *
1588          * @return array Array of Status objects
1589          */
1590         public function performInstallation( $startCB, $endCB ) {
1591                 $installResults = array();
1592                 $installer = $this->getDBInstaller();
1593                 $installer->preInstall();
1594                 $steps = $this->getInstallSteps( $installer );
1595                 foreach ( $steps as $stepObj ) {
1596                         $name = $stepObj['name'];
1597                         call_user_func_array( $startCB, array( $name ) );
1598
1599                         // Perform the callback step
1600                         $status = call_user_func( $stepObj['callback'], $installer );
1601
1602                         // Output and save the results
1603                         call_user_func( $endCB, $name, $status );
1604                         $installResults[$name] = $status;
1605
1606                         // If we've hit some sort of fatal, we need to bail.
1607                         // Callback already had a chance to do output above.
1608                         if ( !$status->isOk() ) {
1609                                 break;
1610                         }
1611                 }
1612                 if ( $status->isOk() ) {
1613                         $this->setVar( '_InstallDone', true );
1614                 }
1615
1616                 return $installResults;
1617         }
1618
1619         /**
1620          * Generate $wgSecretKey. Will warn if we had to use an insecure random source.
1621          *
1622          * @return Status
1623          */
1624         public function generateKeys() {
1625                 $keys = array( 'wgSecretKey' => 64 );
1626                 if ( strval( $this->getVar( 'wgUpgradeKey' ) ) === '' ) {
1627                         $keys['wgUpgradeKey'] = 16;
1628                 }
1629
1630                 return $this->doGenerateKeys( $keys );
1631         }
1632
1633         /**
1634          * Generate a secret value for variables using our CryptRand generator.
1635          * Produce a warning if the random source was insecure.
1636          *
1637          * @param array $keys
1638          * @return Status
1639          */
1640         protected function doGenerateKeys( $keys ) {
1641                 $status = Status::newGood();
1642
1643                 $strong = true;
1644                 foreach ( $keys as $name => $length ) {
1645                         $secretKey = MWCryptRand::generateHex( $length, true );
1646                         if ( !MWCryptRand::wasStrong() ) {
1647                                 $strong = false;
1648                         }
1649
1650                         $this->setVar( $name, $secretKey );
1651                 }
1652
1653                 if ( !$strong ) {
1654                         $names = array_keys( $keys );
1655                         $names = preg_replace( '/^(.*)$/', '\$$1', $names );
1656                         global $wgLang;
1657                         $status->warning( 'config-insecure-keys', $wgLang->listToText( $names ), count( $names ) );
1658                 }
1659
1660                 return $status;
1661         }
1662
1663         /**
1664          * Create the first user account, grant it sysop and bureaucrat rights
1665          *
1666          * @return Status
1667          */
1668         protected function createSysop() {
1669                 $name = $this->getVar( '_AdminName' );
1670                 $user = User::newFromName( $name );
1671
1672                 if ( !$user ) {
1673                         // We should've validated this earlier anyway!
1674                         return Status::newFatal( 'config-admin-error-user', $name );
1675                 }
1676
1677                 if ( $user->idForName() == 0 ) {
1678                         $user->addToDatabase();
1679
1680                         try {
1681                                 $user->setPassword( $this->getVar( '_AdminPassword' ) );
1682                         } catch ( PasswordError $pwe ) {
1683                                 return Status::newFatal( 'config-admin-error-password', $name, $pwe->getMessage() );
1684                         }
1685
1686                         $user->addGroup( 'sysop' );
1687                         $user->addGroup( 'bureaucrat' );
1688                         if ( $this->getVar( '_AdminEmail' ) ) {
1689                                 $user->setEmail( $this->getVar( '_AdminEmail' ) );
1690                         }
1691                         $user->saveSettings();
1692
1693                         // Update user count
1694                         $ssUpdate = new SiteStatsUpdate( 0, 0, 0, 0, 1 );
1695                         $ssUpdate->doUpdate();
1696                 }
1697                 $status = Status::newGood();
1698
1699                 if ( $this->getVar( '_Subscribe' ) && $this->getVar( '_AdminEmail' ) ) {
1700                         $this->subscribeToMediaWikiAnnounce( $status );
1701                 }
1702
1703                 return $status;
1704         }
1705
1706         /**
1707          * @param Status $s
1708          */
1709         private function subscribeToMediaWikiAnnounce( Status $s ) {
1710                 $params = array(
1711                         'email' => $this->getVar( '_AdminEmail' ),
1712                         'language' => 'en',
1713                         'digest' => 0
1714                 );
1715
1716                 // Mailman doesn't support as many languages as we do, so check to make
1717                 // sure their selected language is available
1718                 $myLang = $this->getVar( '_UserLang' );
1719                 if ( in_array( $myLang, $this->mediaWikiAnnounceLanguages ) ) {
1720                         $myLang = $myLang == 'pt-br' ? 'pt_BR' : $myLang; // rewrite to Mailman's pt_BR
1721                         $params['language'] = $myLang;
1722                 }
1723
1724                 if ( MWHttpRequest::canMakeRequests() ) {
1725                         $res = MWHttpRequest::factory( $this->mediaWikiAnnounceUrl,
1726                                 array( 'method' => 'POST', 'postData' => $params ) )->execute();
1727                         if ( !$res->isOK() ) {
1728                                 $s->warning( 'config-install-subscribe-fail', $res->getMessage() );
1729                         }
1730                 } else {
1731                         $s->warning( 'config-install-subscribe-notpossible' );
1732                 }
1733         }
1734
1735         /**
1736          * Insert Main Page with default content.
1737          *
1738          * @param DatabaseInstaller $installer
1739          * @return Status
1740          */
1741         protected function createMainpage( DatabaseInstaller $installer ) {
1742                 $status = Status::newGood();
1743                 try {
1744                         $page = WikiPage::factory( Title::newMainPage() );
1745                         $content = new WikitextContent(
1746                                 wfMessage( 'mainpagetext' )->inContentLanguage()->text() . "\n\n" .
1747                                 wfMessage( 'mainpagedocfooter' )->inContentLanguage()->text()
1748                         );
1749
1750                         $page->doEditContent( $content,
1751                                 '',
1752                                 EDIT_NEW,
1753                                 false,
1754                                 User::newFromName( 'MediaWiki default' )
1755                         );
1756                 } catch ( MWException $e ) {
1757                         //using raw, because $wgShowExceptionDetails can not be set yet
1758                         $status->fatal( 'config-install-mainpage-failed', $e->getMessage() );
1759                 }
1760
1761                 return $status;
1762         }
1763
1764         /**
1765          * Override the necessary bits of the config to run an installation.
1766          */
1767         public static function overrideConfig() {
1768                 define( 'MW_NO_SESSION', 1 );
1769
1770                 // Don't access the database
1771                 $GLOBALS['wgUseDatabaseMessages'] = false;
1772                 // Don't cache langconv tables
1773                 $GLOBALS['wgLanguageConverterCacheType'] = CACHE_NONE;
1774                 // Debug-friendly
1775                 $GLOBALS['wgShowExceptionDetails'] = true;
1776                 // Don't break forms
1777                 $GLOBALS['wgExternalLinkTarget'] = '_blank';
1778
1779                 // Extended debugging
1780                 $GLOBALS['wgShowSQLErrors'] = true;
1781                 $GLOBALS['wgShowDBErrorBacktrace'] = true;
1782
1783                 // Allow multiple ob_flush() calls
1784                 $GLOBALS['wgDisableOutputCompression'] = true;
1785
1786                 // Use a sensible cookie prefix (not my_wiki)
1787                 $GLOBALS['wgCookiePrefix'] = 'mw_installer';
1788
1789                 // Some of the environment checks make shell requests, remove limits
1790                 $GLOBALS['wgMaxShellMemory'] = 0;
1791
1792                 // Don't bother embedding images into generated CSS, which is not cached
1793                 $GLOBALS['wgResourceLoaderLESSFunctions']['embeddable'] = function ( $frame, $less ) {
1794                         return $less->toBool( false );
1795                 };
1796         }
1797
1798         /**
1799          * Add an installation step following the given step.
1800          *
1801          * @param callable $callback A valid installation callback array, in this form:
1802          *    array( 'name' => 'some-unique-name', 'callback' => array( $obj, 'function' ) );
1803          * @param string $findStep The step to find. Omit to put the step at the beginning
1804          */
1805         public function addInstallStep( $callback, $findStep = 'BEGINNING' ) {
1806                 $this->extraInstallSteps[$findStep][] = $callback;
1807         }
1808
1809         /**
1810          * Disable the time limit for execution.
1811          * Some long-running pages (Install, Upgrade) will want to do this
1812          */
1813         protected function disableTimeLimit() {
1814                 wfSuppressWarnings();
1815                 set_time_limit( 0 );
1816                 wfRestoreWarnings();
1817         }
1818 }