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                 'envPrepServer',
 150                 'envPrepPath',
 151         );
 152
 153         /**
 154          * MediaWiki configuration globals that will eventually be passed through
 155          * to LocalSettings.php. The names only are given here, the defaults
 156          * typically come from DefaultSettings.php.
 157          *
 158          * @var array
 159          */
 160         protected $defaultVarNames = array(
 161                 'wgSitename',
 162                 'wgPasswordSender',
 163                 'wgLanguageCode',
 164                 'wgRightsIcon',
 165                 'wgRightsText',
 166                 'wgRightsUrl',
 167                 'wgEnableEmail',
 168                 'wgEnableUserEmail',
 169                 'wgEnotifUserTalk',
 170                 'wgEnotifWatchlist',
 171                 'wgEmailAuthentication',
 172                 'wgDBname',
 173                 'wgDBtype',
 174                 'wgDiff3',
 175                 'wgImageMagickConvertCommand',
 176                 'wgGitBin',
 177                 'IP',
 178                 'wgScriptPath',
 179                 'wgMetaNamespace',
 180                 'wgDeletedDirectory',
 181                 'wgEnableUploads',
 182                 'wgShellLocale',
 183                 'wgSecretKey',
 184                 'wgUseInstantCommons',
 185                 'wgUpgradeKey',
 186                 'wgDefaultSkin',
 187         );
 188
 189         /**
 190          * Variables that are stored alongside globals, and are used for any
 191          * configuration of the installation process aside from the MediaWiki
 192          * configuration. Map of names to defaults.
 193          *
 194          * @var array
 195          */
 196         protected $internalDefaults = array(
 197                 '_UserLang' => 'en',
 198                 '_Environment' => false,
 199                 '_SafeMode' => false,
 200                 '_RaiseMemory' => false,
 201                 '_UpgradeDone' => false,
 202                 '_InstallDone' => false,
 203                 '_Caches' => array(),
 204                 '_InstallPassword' => '',
 205                 '_SameAccount' => true,
 206                 '_CreateDBAccount' => false,
 207                 '_NamespaceType' => 'site-name',
 208                 '_AdminName' => '', // will be set later, when the user selects language
 209                 '_AdminPassword' => '',
 210                 '_AdminPasswordConfirm' => '',
 211                 '_AdminEmail' => '',
 212                 '_Subscribe' => false,
 213                 '_SkipOptional' => 'continue',
 214                 '_RightsProfile' => 'wiki',
 215                 '_LicenseCode' => 'none',
 216                 '_CCDone' => false,
 217                 '_Extensions' => array(),
 218                 '_Skins' => array(),
 219                 '_MemCachedServers' => '',
 220                 '_UpgradeKeySupplied' => false,
 221                 '_ExistingDBSettings' => false,
 222
 223                 // $wgLogo is probably wrong (bug 48084); set something that will work.
 224                 // Single quotes work fine here, as LocalSettingsGenerator outputs this unescaped.
 225                 'wgLogo' => '$wgResourceBasePath/resources/assets/wiki.png',
 226                 'wgAuthenticationTokenVersion' => 1,
 227         );
 228
 229         /**
 230          * The actual list of installation steps. This will be initialized by getInstallSteps()
 231          *
 232          * @var array
 233          */
 234         private $installSteps = array();
 235
 236         /**
 237          * Extra steps for installation, for things like DatabaseInstallers to modify
 238          *
 239          * @var array
 240          */
 241         protected $extraInstallSteps = array();
 242
 243         /**
 244          * Known object cache types and the functions used to test for their existence.
 245          *
 246          * @var array
 247          */
 248         protected $objectCaches = array(
 249                 'xcache' => 'xcache_get',
 250                 'apc' => 'apc_fetch',
 251                 'wincache' => 'wincache_ucache_get'
 252         );
 253
 254         /**
 255          * User rights profiles.
 256          *
 257          * @var array
 258          */
 259         public $rightsProfiles = array(
 260                 'wiki' => array(),
 261                 'no-anon' => array(
 262                         '*' => array( 'edit' => false )
 263                 ),
 264                 'fishbowl' => array(
 265                         '*' => array(
 266                                 'createaccount' => false,
 267                                 'edit' => false,
 268                         ),
 269                 ),
 270                 'private' => array(
 271                         '*' => array(
 272                                 'createaccount' => false,
 273                                 'edit' => false,
 274                                 'read' => false,
 275                         ),
 276                 ),
 277         );
 278
 279         /**
 280          * License types.
 281          *
 282          * @var array
 283          */
 284         public $licenses = array(
 285                 'cc-by' => array(
 286                         'url' => 'https://creativecommons.org/licenses/by/4.0/',
 287                         'icon' => '$wgResourceBasePath/resources/assets/licenses/cc-by.png',
 288                 ),
 289                 'cc-by-sa' => array(
 290                         'url' => 'https://creativecommons.org/licenses/by-sa/4.0/',
 291                         'icon' => '$wgResourceBasePath/resources/assets/licenses/cc-by-sa.png',
 292                 ),
 293                 'cc-by-nc-sa' => array(
 294                         'url' => 'https://creativecommons.org/licenses/by-nc-sa/4.0/',
 295                         'icon' => '$wgResourceBasePath/resources/assets/licenses/cc-by-nc-sa.png',
 296                 ),
 297                 'cc-0' => array(
 298                         'url' => 'https://creativecommons.org/publicdomain/zero/1.0/',
 299                         'icon' => '$wgResourceBasePath/resources/assets/licenses/cc-0.png',
 300                 ),
 301                 'pd' => array(
 302                         'url' => '',
 303                         'icon' => '$wgResourceBasePath/resources/assets/licenses/public-domain.png',
 304                 ),
 305                 'gfdl' => array(
 306                         'url' => 'https://www.gnu.org/copyleft/fdl.html',
 307                         'icon' => '$wgResourceBasePath/resources/assets/licenses/gnu-fdl.png',
 308                 ),
 309                 'none' => array(
 310                         'url' => '',
 311                         'icon' => '',
 312                         'text' => ''
 313                 ),
 314                 'cc-choose' => array(
 315                         // Details will be filled in by the selector.
 316                         'url' => '',
 317                         'icon' => '',
 318                         'text' => '',
 319                 ),
 320         );
 321
 322         /**
 323          * URL to mediawiki-announce subscription
 324          */
 325         protected $mediaWikiAnnounceUrl =
 326                 'https://lists.wikimedia.org/mailman/subscribe/mediawiki-announce';
 327
 328         /**
 329          * Supported language codes for Mailman
 330          */
 331         protected $mediaWikiAnnounceLanguages = array(
 332                 'ca', 'cs', 'da', 'de', 'en', 'es', 'et', 'eu', 'fi', 'fr', 'hr', 'hu',
 333                 'it', 'ja', 'ko', 'lt', 'nl', 'no', 'pl', 'pt', 'pt-br', 'ro', 'ru',
 334                 'sl', 'sr', 'sv', 'tr', 'uk'
 335         );
 336
 337         /**
 338          * UI interface for displaying a short message
 339          * The parameters are like parameters to wfMessage().
 340          * The messages will be in wikitext format, which will be converted to an
 341          * output format such as HTML or text before being sent to the user.
 342          * @param string $msg
 343          */
 344         abstract public function showMessage( $msg /*, ... */ );
 345
 346         /**
 347          * Same as showMessage(), but for displaying errors
 348          * @param string $msg
 349          */
 350         abstract public function showError( $msg /*, ... */ );
 351
 352         /**
 353          * Show a message to the installing user by using a Status object
 354          * @param Status $status
 355          */
 356         abstract public function showStatusMessage( Status $status );
 357
 358         /**
 359          * Constructor, always call this from child classes.
 360          */
 361         public function __construct() {
 362                 global $wgMessagesDirs, $wgUser;
 363
 364                 // Disable the i18n cache
 365                 Language::getLocalisationCache()->disableBackend();
 366                 // Disable LoadBalancer and wfGetDB etc.
 367                 LBFactory::disableBackend();
 368
 369                 // Disable object cache (otherwise CACHE_ANYTHING will try CACHE_DB and
 370                 // SqlBagOStuff will then throw since we just disabled wfGetDB)
 371                 $GLOBALS['wgMemc'] = new EmptyBagOStuff;
 372                 ObjectCache::clear();
 373                 $emptyCache = array( 'class' => 'EmptyBagOStuff' );
 374                 // disable (problematic) object cache types explicitly, preserving all other (working) ones
 375                 // bug T113843
 376                 $GLOBALS['wgObjectCaches'] = array(
 377                         CACHE_NONE => $emptyCache,
 378                         CACHE_DB => $emptyCache,
 379                         CACHE_ANYTHING => $emptyCache,
 380                         CACHE_MEMCACHED => $emptyCache,
 381                 ) + $GLOBALS['wgObjectCaches'];
 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://phabricator.wikimedia.org/T69440
 541                 global $wgAutoloadClasses;
 542                 $wgAutoloadClasses = array();
 543
 544                 // @codingStandardsIgnoreStart
 545                 // LocalSettings.php should not call functions, except wfLoadSkin/wfLoadExtensions
 546                 // Define the required globals here, to ensure, the functions can do it work correctly.
 547                 global $wgExtensionDirectory, $wgStyleDirectory;
 548                 // @codingStandardsIgnoreEnd
 549
 550                 MediaWiki\suppressWarnings();
 551                 $_lsExists = file_exists( "$IP/LocalSettings.php" );
 552                 MediaWiki\restoreWarnings();
 553
 554                 if ( !$_lsExists ) {
 555                         return false;
 556                 }
 557                 unset( $_lsExists );
 558
 559                 require "$IP/includes/DefaultSettings.php";
 560                 require "$IP/LocalSettings.php";
 561
 562                 return get_defined_vars();
 563         }
 564
 565         /**
 566          * Get a fake password for sending back to the user in HTML.
 567          * This is a security mechanism to avoid compromise of the password in the
 568          * event of session ID compromise.
 569          *
 570          * @param string $realPassword
 571          *
 572          * @return string
 573          */
 574         public function getFakePassword( $realPassword ) {
 575                 return str_repeat( '*', strlen( $realPassword ) );
 576         }
 577
 578         /**
 579          * Set a variable which stores a password, except if the new value is a
 580          * fake password in which case leave it as it is.
 581          *
 582          * @param string $name
 583          * @param mixed $value
 584          */
 585         public function setPassword( $name, $value ) {
 586                 if ( !preg_match( '/^\*+$/', $value ) ) {
 587                         $this->setVar( $name, $value );
 588                 }
 589         }
 590
 591         /**
 592          * On POSIX systems return the primary group of the webserver we're running under.
 593          * On other systems just returns null.
 594          *
 595          * This is used to advice the user that he should chgrp his mw-config/data/images directory as the
 596          * webserver user before he can install.
 597          *
 598          * Public because SqliteInstaller needs it, and doesn't subclass Installer.
 599          *
 600          * @return mixed
 601          */
 602         public static function maybeGetWebserverPrimaryGroup() {
 603                 if ( !function_exists( 'posix_getegid' ) || !function_exists( 'posix_getpwuid' ) ) {
 604                         # I don't know this, this isn't UNIX.
 605                         return null;
 606                 }
 607
 608                 # posix_getegid() *not* getmygid() because we want the group of the webserver,
 609                 # not whoever owns the current script.
 610                 $gid = posix_getegid();
 611                 $getpwuid = posix_getpwuid( $gid );
 612                 $group = $getpwuid['name'];
 613
 614                 return $group;
 615         }
 616
 617         /**
 618          * Convert wikitext $text to HTML.
 619          *
 620          * This is potentially error prone since many parser features require a complete
 621          * installed MW database. The solution is to just not use those features when you
 622          * write your messages. This appears to work well enough. Basic formatting and
 623          * external links work just fine.
 624          *
 625          * But in case a translator decides to throw in a "#ifexist" or internal link or
 626          * whatever, this function is guarded to catch the attempted DB access and to present
 627          * some fallback text.
 628          *
 629          * @param string $text
 630          * @param bool $lineStart
 631          * @return string
 632          */
 633         public function parse( $text, $lineStart = false ) {
 634                 global $wgParser;
 635
 636                 try {
 637                         $out = $wgParser->parse( $text, $this->parserTitle, $this->parserOptions, $lineStart );
 638                         $html = $out->getText();
 639                 } catch ( DBAccessError $e ) {
 640                         $html = '<!--DB access attempted during parse-->  ' . htmlspecialchars( $text );
 641
 642                         if ( !empty( $this->debug ) ) {
 643                                 $html .= "<!--\n" . $e->getTraceAsString() . "\n-->";
 644                         }
 645                 }
 646
 647                 return $html;
 648         }
 649
 650         /**
 651          * @return ParserOptions
 652          */
 653         public function getParserOptions() {
 654                 return $this->parserOptions;
 655         }
 656
 657         public function disableLinkPopups() {
 658                 $this->parserOptions->setExternalLinkTarget( false );
 659         }
 660
 661         public function restoreLinkPopups() {
 662                 global $wgExternalLinkTarget;
 663                 $this->parserOptions->setExternalLinkTarget( $wgExternalLinkTarget );
 664         }
 665
 666         /**
 667          * Install step which adds a row to the site_stats table with appropriate
 668          * initial values.
 669          *
 670          * @param DatabaseInstaller $installer
 671          *
 672          * @return Status
 673          */
 674         public function populateSiteStats( DatabaseInstaller $installer ) {
 675                 $status = $installer->getConnection();
 676                 if ( !$status->isOK() ) {
 677                         return $status;
 678                 }
 679                 $status->value->insert(
 680                         'site_stats',
 681                         array(
 682                                 'ss_row_id' => 1,
 683                                 'ss_total_edits' => 0,
 684                                 'ss_good_articles' => 0,
 685                                 'ss_total_pages' => 0,
 686                                 'ss_users' => 0,
 687                                 'ss_images' => 0
 688                         ),
 689                         __METHOD__, 'IGNORE'
 690                 );
 691
 692                 return Status::newGood();
 693         }
 694
 695         /**
 696          * Environment check for DB types.
 697          * @return bool
 698          */
 699         protected function envCheckDB() {
 700                 global $wgLang;
 701
 702                 $allNames = array();
 703
 704                 // Messages: config-type-mysql, config-type-postgres, config-type-oracle,
 705                 // config-type-sqlite
 706                 foreach ( self::getDBTypes() as $name ) {
 707                         $allNames[] = wfMessage( "config-type-$name" )->text();
 708                 }
 709
 710                 $databases = $this->getCompiledDBs();
 711
 712                 $databases = array_flip( $databases );
 713                 foreach ( array_keys( $databases ) as $db ) {
 714                         $installer = $this->getDBInstaller( $db );
 715                         $status = $installer->checkPrerequisites();
 716                         if ( !$status->isGood() ) {
 717                                 $this->showStatusMessage( $status );
 718                         }
 719                         if ( !$status->isOK() ) {
 720                                 unset( $databases[$db] );
 721                         }
 722                 }
 723                 $databases = array_flip( $databases );
 724                 if ( !$databases ) {
 725                         $this->showError( 'config-no-db', $wgLang->commaList( $allNames ), count( $allNames ) );
 726
 727                         // @todo FIXME: This only works for the web installer!
 728                         return false;
 729                 }
 730
 731                 return true;
 732         }
 733
 734         /**
 735          * Environment check for register_globals.
 736          * Prevent installation if enabled
 737          * @return bool
 738          */
 739         protected function envCheckRegisterGlobals() {
 740                 if ( wfIniGetBool( 'register_globals' ) ) {
 741                         $this->showMessage( 'config-register-globals-error' );
 742                         return false;
 743                 }
 744
 745                 return true;
 746         }
 747
 748         /**
 749          * Some versions of libxml+PHP break < and > encoding horribly
 750          * @return bool
 751          */
 752         protected function envCheckBrokenXML() {
 753                 $test = new PhpXmlBugTester();
 754                 if ( !$test->ok ) {
 755                         $this->showError( 'config-brokenlibxml' );
 756
 757                         return false;
 758                 }
 759
 760                 return true;
 761         }
 762
 763         /**
 764          * Environment check for magic_quotes_(gpc|runtime|sybase).
 765          * @return bool
 766          */
 767         protected function envCheckMagicQuotes() {
 768                 $status = true;
 769                 foreach ( array( 'gpc', 'runtime', 'sybase' ) as $magicJunk ) {
 770                         if ( wfIniGetBool( "magic_quotes_$magicJunk" ) ) {
 771                                 $this->showError( "config-magic-quotes-$magicJunk" );
 772                                 $status = false;
 773                         }
 774                 }
 775
 776                 return $status;
 777         }
 778
 779         /**
 780          * Environment check for mbstring.func_overload.
 781          * @return bool
 782          */
 783         protected function envCheckMbstring() {
 784                 if ( wfIniGetBool( 'mbstring.func_overload' ) ) {
 785                         $this->showError( 'config-mbstring' );
 786
 787                         return false;
 788                 }
 789
 790                 return true;
 791         }
 792
 793         /**
 794          * Environment check for safe_mode.
 795          * @return bool
 796          */
 797         protected function envCheckSafeMode() {
 798                 if ( wfIniGetBool( 'safe_mode' ) ) {
 799                         $this->setVar( '_SafeMode', true );
 800                         $this->showMessage( 'config-safe-mode' );
 801                 }
 802
 803                 return true;
 804         }
 805
 806         /**
 807          * Environment check for the XML module.
 808          * @return bool
 809          */
 810         protected function envCheckXML() {
 811                 if ( !function_exists( "utf8_encode" ) ) {
 812                         $this->showError( 'config-xml-bad' );
 813
 814                         return false;
 815                 }
 816
 817                 return true;
 818         }
 819
 820         /**
 821          * Environment check for the PCRE module.
 822          *
 823          * @note If this check were to fail, the parser would
 824          *   probably throw an exception before the result
 825          *   of this check is shown to the user.
 826          * @return bool
 827          */
 828         protected function envCheckPCRE() {
 829                 MediaWiki\suppressWarnings();
 830                 $regexd = preg_replace( '/[\x{0430}-\x{04FF}]/iu', '', '-АБВГД-' );
 831                 // Need to check for \p support too, as PCRE can be compiled
 832                 // with utf8 support, but not unicode property support.
 833                 // check that \p{Zs} (space separators) matches
 834                 // U+3000 (Ideographic space)
 835                 $regexprop = preg_replace( '/\p{Zs}/u', '', "-\xE3\x80\x80-" );
 836                 MediaWiki\restoreWarnings();
 837                 if ( $regexd != '--' || $regexprop != '--' ) {
 838                         $this->showError( 'config-pcre-no-utf8' );
 839
 840                         return false;
 841                 }
 842
 843                 return true;
 844         }
 845
 846         /**
 847          * Environment check for available memory.
 848          * @return bool
 849          */
 850         protected function envCheckMemory() {
 851                 $limit = ini_get( 'memory_limit' );
 852
 853                 if ( !$limit || $limit == -1 ) {
 854                         return true;
 855                 }
 856
 857                 $n = wfShorthandToInteger( $limit );
 858
 859                 if ( $n < $this->minMemorySize * 1024 * 1024 ) {
 860                         $newLimit = "{$this->minMemorySize}M";
 861
 862                         if ( ini_set( "memory_limit", $newLimit ) === false ) {
 863                                 $this->showMessage( 'config-memory-bad', $limit );
 864                         } else {
 865                                 $this->showMessage( 'config-memory-raised', $limit, $newLimit );
 866                                 $this->setVar( '_RaiseMemory', true );
 867                         }
 868                 }
 869
 870                 return true;
 871         }
 872
 873         /**
 874          * Environment check for compiled object cache types.
 875          */
 876         protected function envCheckCache() {
 877                 $caches = array();
 878                 foreach ( $this->objectCaches as $name => $function ) {
 879                         if ( function_exists( $function ) ) {
 880                                 if ( $name == 'xcache' && !wfIniGetBool( 'xcache.var_size' ) ) {
 881                                         continue;
 882                                 }
 883                                 $caches[$name] = true;
 884                         }
 885                 }
 886
 887                 if ( !$caches ) {
 888                         $key = 'config-no-cache';
 889                         // PHP >=5.5 is called APCu, earlier versions use APC (T61998).
 890                         if ( !wfIsHHVM() && version_compare( PHP_VERSION, '5.5', '>=' ) ) {
 891                                 // config-no-cache-apcu
 892                                 $key .= '-apcu';
 893                         }
 894                         $this->showMessage( $key );
 895                 }
 896
 897                 $this->setVar( '_Caches', $caches );
 898         }
 899
 900         /**
 901          * Scare user to death if they have mod_security or mod_security2
 902          * @return bool
 903          */
 904         protected function envCheckModSecurity() {
 905                 if ( self::apacheModulePresent( 'mod_security' )
 906                         || self::apacheModulePresent( 'mod_security2' ) ) {
 907                         $this->showMessage( 'config-mod-security' );
 908                 }
 909
 910                 return true;
 911         }
 912
 913         /**
 914          * Search for GNU diff3.
 915          * @return bool
 916          */
 917         protected function envCheckDiff3() {
 918                 $names = array( "gdiff3", "diff3", "diff3.exe" );
 919                 $versionInfo = array( '$1 --version 2>&1', 'GNU diffutils' );
 920
 921                 $diff3 = self::locateExecutableInDefaultPaths( $names, $versionInfo );
 922
 923                 if ( $diff3 ) {
 924                         $this->setVar( 'wgDiff3', $diff3 );
 925                 } else {
 926                         $this->setVar( 'wgDiff3', false );
 927                         $this->showMessage( 'config-diff3-bad' );
 928                 }
 929
 930                 return true;
 931         }
 932
 933         /**
 934          * Environment check for ImageMagick and GD.
 935          * @return bool
 936          */
 937         protected function envCheckGraphics() {
 938                 $names = array( wfIsWindows() ? 'convert.exe' : 'convert' );
 939                 $versionInfo = array( '$1 -version', 'ImageMagick' );
 940                 $convert = self::locateExecutableInDefaultPaths( $names, $versionInfo );
 941
 942                 $this->setVar( 'wgImageMagickConvertCommand', '' );
 943                 if ( $convert ) {
 944                         $this->setVar( 'wgImageMagickConvertCommand', $convert );
 945                         $this->showMessage( 'config-imagemagick', $convert );
 946
 947                         return true;
 948                 } elseif ( function_exists( 'imagejpeg' ) ) {
 949                         $this->showMessage( 'config-gd' );
 950                 } else {
 951                         $this->showMessage( 'config-no-scaling' );
 952                 }
 953
 954                 return true;
 955         }
 956
 957         /**
 958          * Search for git.
 959          *
 960          * @since 1.22
 961          * @return bool
 962          */
 963         protected function envCheckGit() {
 964                 $names = array( wfIsWindows() ? 'git.exe' : 'git' );
 965                 $versionInfo = array( '$1 --version', 'git version' );
 966
 967                 $git = self::locateExecutableInDefaultPaths( $names, $versionInfo );
 968
 969                 if ( $git ) {
 970                         $this->setVar( 'wgGitBin', $git );
 971                         $this->showMessage( 'config-git', $git );
 972                 } else {
 973                         $this->setVar( 'wgGitBin', false );
 974                         $this->showMessage( 'config-git-bad' );
 975                 }
 976
 977                 return true;
 978         }
 979
 980         /**
 981          * Environment check to inform user which server we've assumed.
 982          *
 983          * @return bool
 984          */
 985         protected function envCheckServer() {
 986                 $server = $this->envGetDefaultServer();
 987                 if ( $server !== null ) {
 988                         $this->showMessage( 'config-using-server', $server );
 989                 }
 990                 return true;
 991         }
 992
 993         /**
 994          * Environment check to inform user which paths we've assumed.
 995          *
 996          * @return bool
 997          */
 998         protected function envCheckPath() {
 999                 $this->showMessage(
1000                         'config-using-uri',
1001                         $this->getVar( 'wgServer' ),
1002                         $this->getVar( 'wgScriptPath' )
1003                 );
1004                 return true;
1005         }
1006
1007         /**
1008          * Environment check for preferred locale in shell
1009          * @return bool
1010          */
1011         protected function envCheckShellLocale() {
1012                 $os = php_uname( 's' );
1013                 $supported = array( 'Linux', 'SunOS', 'HP-UX', 'Darwin' ); # Tested these
1014
1015                 if ( !in_array( $os, $supported ) ) {
1016                         return true;
1017                 }
1018
1019                 # Get a list of available locales.
1020                 $ret = false;
1021                 $lines = wfShellExec( '/usr/bin/locale -a', $ret );
1022
1023                 if ( $ret ) {
1024                         return true;
1025                 }
1026
1027                 $lines = array_map( 'trim', explode( "\n", $lines ) );
1028                 $candidatesByLocale = array();
1029                 $candidatesByLang = array();
1030
1031                 foreach ( $lines as $line ) {
1032                         if ( $line === '' ) {
1033                                 continue;
1034                         }
1035
1036                         if ( !preg_match( '/^([a-zA-Z]+)(_[a-zA-Z]+|)\.(utf8|UTF-8)(@[a-zA-Z_]*|)$/i', $line, $m ) ) {
1037                                 continue;
1038                         }
1039
1040                         list( , $lang, , , ) = $m;
1041
1042                         $candidatesByLocale[$m[0]] = $m;
1043                         $candidatesByLang[$lang][] = $m;
1044                 }
1045
1046                 # Try the current value of LANG.
1047                 if ( isset( $candidatesByLocale[getenv( 'LANG' )] ) ) {
1048                         $this->setVar( 'wgShellLocale', getenv( 'LANG' ) );
1049
1050                         return true;
1051                 }
1052
1053                 # Try the most common ones.
1054                 $commonLocales = array( 'en_US.UTF-8', 'en_US.utf8', 'de_DE.UTF-8', 'de_DE.utf8' );
1055                 foreach ( $commonLocales as $commonLocale ) {
1056                         if ( isset( $candidatesByLocale[$commonLocale] ) ) {
1057                                 $this->setVar( 'wgShellLocale', $commonLocale );
1058
1059                                 return true;
1060                         }
1061                 }
1062
1063                 # Is there an available locale in the Wiki's language?
1064                 $wikiLang = $this->getVar( 'wgLanguageCode' );
1065
1066                 if ( isset( $candidatesByLang[$wikiLang] ) ) {
1067                         $m = reset( $candidatesByLang[$wikiLang] );
1068                         $this->setVar( 'wgShellLocale', $m[0] );
1069
1070                         return true;
1071                 }
1072
1073                 # Are there any at all?
1074                 if ( count( $candidatesByLocale ) ) {
1075                         $m = reset( $candidatesByLocale );
1076                         $this->setVar( 'wgShellLocale', $m[0] );
1077
1078                         return true;
1079                 }
1080
1081                 # Give up.
1082                 return true;
1083         }
1084
1085         /**
1086          * Environment check for the permissions of the uploads directory
1087          * @return bool
1088          */
1089         protected function envCheckUploadsDirectory() {
1090                 global $IP;
1091
1092                 $dir = $IP . '/images/';
1093                 $url = $this->getVar( 'wgServer' ) . $this->getVar( 'wgScriptPath' ) . '/images/';
1094                 $safe = !$this->dirIsExecutable( $dir, $url );
1095
1096                 if ( !$safe ) {
1097                         $this->showMessage( 'config-uploads-not-safe', $dir );
1098                 }
1099
1100                 return true;
1101         }
1102
1103         /**
1104          * Checks if suhosin.get.max_value_length is set, and if so generate
1105          * a warning because it decreases ResourceLoader performance.
1106          * @return bool
1107          */
1108         protected function envCheckSuhosinMaxValueLength() {
1109                 $maxValueLength = ini_get( 'suhosin.get.max_value_length' );
1110                 if ( $maxValueLength > 0 && $maxValueLength < 1024 ) {
1111                         // Only warn if the value is below the sane 1024
1112                         $this->showMessage( 'config-suhosin-max-value-length', $maxValueLength );
1113                 }
1114
1115                 return true;
1116         }
1117
1118         /**
1119          * Convert a hex string representing a Unicode code point to that code point.
1120          * @param string $c
1121          * @return string
1122          */
1123         protected function unicodeChar( $c ) {
1124                 $c = hexdec( $c );
1125                 if ( $c <= 0x7F ) {
1126                         return chr( $c );
1127                 } elseif ( $c <= 0x7FF ) {
1128                         return chr( 0xC0 | $c >> 6 ) . chr( 0x80 | $c & 0x3F );
1129                 } elseif ( $c <= 0xFFFF ) {
1130                         return chr( 0xE0 | $c >> 12 ) . chr( 0x80 | $c >> 6 & 0x3F ) .
1131                                 chr( 0x80 | $c & 0x3F );
1132                 } elseif ( $c <= 0x10FFFF ) {
1133                         return chr( 0xF0 | $c >> 18 ) . chr( 0x80 | $c >> 12 & 0x3F ) .
1134                                 chr( 0x80 | $c >> 6 & 0x3F ) .
1135                                 chr( 0x80 | $c & 0x3F );
1136                 } else {
1137                         return false;
1138                 }
1139         }
1140
1141         /**
1142          * Check the libicu version
1143          */
1144         protected function envCheckLibicu() {
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                 if ( function_exists( 'normalizer_normalize' ) ) {
1159                         $useNormalizer = 'intl';
1160                         $intl = normalizer_normalize( $not_normal_c, Normalizer::FORM_C );
1161                         if ( $intl !== $normal_c ) {
1162                                 $needsUpdate = true;
1163                         }
1164                 }
1165
1166                 // Uses messages 'config-unicode-using-php' and 'config-unicode-using-intl'
1167                 if ( $useNormalizer === 'php' ) {
1168                         $this->showMessage( 'config-unicode-pure-php-warning' );
1169                 } else {
1170                         $this->showMessage( 'config-unicode-using-' . $useNormalizer );
1171                         if ( $needsUpdate ) {
1172                                 $this->showMessage( 'config-unicode-update-warning' );
1173                         }
1174                 }
1175         }
1176
1177         /**
1178          * @return bool
1179          */
1180         protected function envCheckCtype() {
1181                 if ( !function_exists( 'ctype_digit' ) ) {
1182                         $this->showError( 'config-ctype' );
1183
1184                         return false;
1185                 }
1186
1187                 return true;
1188         }
1189
1190         /**
1191          * @return bool
1192          */
1193         protected function envCheckIconv() {
1194                 if ( !function_exists( 'iconv' ) ) {
1195                         $this->showError( 'config-iconv' );
1196
1197                         return false;
1198                 }
1199
1200                 return true;
1201         }
1202
1203         /**
1204          * @return bool
1205          */
1206         protected function envCheckJSON() {
1207                 if ( !function_exists( 'json_decode' ) ) {
1208                         $this->showError( 'config-json' );
1209
1210                         return false;
1211                 }
1212
1213                 return true;
1214         }
1215
1216         /**
1217          * Environment prep for the server hostname.
1218          */
1219         protected function envPrepServer() {
1220                 $server = $this->envGetDefaultServer();
1221                 if ( $server !== null ) {
1222                         $this->setVar( 'wgServer', $server );
1223                 }
1224         }
1225
1226         /**
1227          * Helper function to be called from envPrepServer()
1228          * @return string
1229          */
1230         abstract protected function envGetDefaultServer();
1231
1232         /**
1233          * Environment prep for setting $IP and $wgScriptPath.
1234          */
1235         protected function envPrepPath() {
1236                 global $IP;
1237                 $IP = dirname( dirname( __DIR__ ) );
1238                 $this->setVar( 'IP', $IP );
1239         }
1240
1241         /**
1242          * Get an array of likely places we can find executables. Check a bunch
1243          * of known Unix-like defaults, as well as the PATH environment variable
1244          * (which should maybe make it work for Windows?)
1245          *
1246          * @return array
1247          */
1248         protected static function getPossibleBinPaths() {
1249                 return array_merge(
1250                         array( '/usr/bin', '/usr/local/bin', '/opt/csw/bin',
1251                                 '/usr/gnu/bin', '/usr/sfw/bin', '/sw/bin', '/opt/local/bin' ),
1252                         explode( PATH_SEPARATOR, getenv( 'PATH' ) )
1253                 );
1254         }
1255
1256         /**
1257          * Search a path for any of the given executable names. Returns the
1258          * executable name if found. Also checks the version string returned
1259          * by each executable.
1260          *
1261          * Used only by environment checks.
1262          *
1263          * @param string $path Path to search
1264          * @param array $names Array of executable names
1265          * @param array|bool $versionInfo False or array with two members:
1266          *   0 => Command to run for version check, with $1 for the full executable name
1267          *   1 => String to compare the output with
1268          *
1269          * If $versionInfo is not false, only executables with a version
1270          * matching $versionInfo[1] will be returned.
1271          * @return bool|string
1272          */
1273         public static function locateExecutable( $path, $names, $versionInfo = false ) {
1274                 if ( !is_array( $names ) ) {
1275                         $names = array( $names );
1276                 }
1277
1278                 foreach ( $names as $name ) {
1279                         $command = $path . DIRECTORY_SEPARATOR . $name;
1280
1281                         MediaWiki\suppressWarnings();
1282                         $file_exists = file_exists( $command );
1283                         MediaWiki\restoreWarnings();
1284
1285                         if ( $file_exists ) {
1286                                 if ( !$versionInfo ) {
1287                                         return $command;
1288                                 }
1289
1290                                 $file = str_replace( '$1', wfEscapeShellArg( $command ), $versionInfo[0] );
1291                                 if ( strstr( wfShellExec( $file ), $versionInfo[1] ) !== false ) {
1292                                         return $command;
1293                                 }
1294                         }
1295                 }
1296
1297                 return false;
1298         }
1299
1300         /**
1301          * Same as locateExecutable(), but checks in getPossibleBinPaths() by default
1302          * @see locateExecutable()
1303          * @param array $names Array of possible names.
1304          * @param array|bool $versionInfo Default: false or array with two members:
1305          *   0 => Command to run for version check, with $1 for the full executable name
1306          *   1 => String to compare the output with
1307          *
1308          * If $versionInfo is not false, only executables with a version
1309          * matching $versionInfo[1] will be returned.
1310          * @return bool|string
1311          */
1312         public static function locateExecutableInDefaultPaths( $names, $versionInfo = false ) {
1313                 foreach ( self::getPossibleBinPaths() as $path ) {
1314                         $exe = self::locateExecutable( $path, $names, $versionInfo );
1315                         if ( $exe !== false ) {
1316                                 return $exe;
1317                         }
1318                 }
1319
1320                 return false;
1321         }
1322
1323         /**
1324          * Checks if scripts located in the given directory can be executed via the given URL.
1325          *
1326          * Used only by environment checks.
1327          * @param string $dir
1328          * @param string $url
1329          * @return bool|int|string
1330          */
1331         public function dirIsExecutable( $dir, $url ) {
1332                 $scriptTypes = array(
1333                         'php' => array(
1334                                 "<?php echo 'ex' . 'ec';",
1335                                 "#!/var/env php5\n<?php echo 'ex' . 'ec';",
1336                         ),
1337                 );
1338
1339                 // it would be good to check other popular languages here, but it'll be slow.
1340
1341                 MediaWiki\suppressWarnings();
1342
1343                 foreach ( $scriptTypes as $ext => $contents ) {
1344                         foreach ( $contents as $source ) {
1345                                 $file = 'exectest.' . $ext;
1346
1347                                 if ( !file_put_contents( $dir . $file, $source ) ) {
1348                                         break;
1349                                 }
1350
1351                                 try {
1352                                         $text = Http::get( $url . $file, array( 'timeout' => 3 ), __METHOD__ );
1353                                 } catch ( Exception $e ) {
1354                                         // Http::get throws with allow_url_fopen = false and no curl extension.
1355                                         $text = null;
1356                                 }
1357                                 unlink( $dir . $file );
1358
1359                                 if ( $text == 'exec' ) {
1360                                         MediaWiki\restoreWarnings();
1361
1362                                         return $ext;
1363                                 }
1364                         }
1365                 }
1366
1367                 MediaWiki\restoreWarnings();
1368
1369                 return false;
1370         }
1371
1372         /**
1373          * Checks for presence of an Apache module. Works only if PHP is running as an Apache module, too.
1374          *
1375          * @param string $moduleName Name of module to check.
1376          * @return bool
1377          */
1378         public static function apacheModulePresent( $moduleName ) {
1379                 if ( function_exists( 'apache_get_modules' ) && in_array( $moduleName, apache_get_modules() ) ) {
1380                         return true;
1381                 }
1382                 // try it the hard way
1383                 ob_start();
1384                 phpinfo( INFO_MODULES );
1385                 $info = ob_get_clean();
1386
1387                 return strpos( $info, $moduleName ) !== false;
1388         }
1389
1390         /**
1391          * ParserOptions are constructed before we determined the language, so fix it
1392          *
1393          * @param Language $lang
1394          */
1395         public function setParserLanguage( $lang ) {
1396                 $this->parserOptions->setTargetLanguage( $lang );
1397                 $this->parserOptions->setUserLang( $lang );
1398         }
1399
1400         /**
1401          * Overridden by WebInstaller to provide lastPage parameters.
1402          * @param string $page
1403          * @return string
1404          */
1405         protected function getDocUrl( $page ) {
1406                 return "{$_SERVER['PHP_SELF']}?page=" . urlencode( $page );
1407         }
1408
1409         /**
1410          * Finds extensions that follow the format /$directory/Name/Name.php,
1411          * and returns an array containing the value for 'Name' for each found extension.
1412          *
1413          * Reasonable values for $directory include 'extensions' (the default) and 'skins'.
1414          *
1415          * @param string $directory Directory to search in
1416          * @return array
1417          */
1418         public function findExtensions( $directory = 'extensions' ) {
1419                 if ( $this->getVar( 'IP' ) === null ) {
1420                         return array();
1421                 }
1422
1423                 $extDir = $this->getVar( 'IP' ) . '/' . $directory;
1424                 if ( !is_readable( $extDir ) || !is_dir( $extDir ) ) {
1425                         return array();
1426                 }
1427
1428                 // extensions -> extension.json, skins -> skin.json
1429                 $jsonFile = substr( $directory, 0, strlen( $directory ) -1 ) . '.json';
1430
1431                 $dh = opendir( $extDir );
1432                 $exts = array();
1433                 while ( ( $file = readdir( $dh ) ) !== false ) {
1434                         if ( !is_dir( "$extDir/$file" ) ) {
1435                                 continue;
1436                         }
1437                         if ( file_exists( "$extDir/$file/$jsonFile" ) || file_exists( "$extDir/$file/$file.php" ) ) {
1438                                 $exts[] = $file;
1439                         }
1440                 }
1441                 closedir( $dh );
1442                 natcasesort( $exts );
1443
1444                 return $exts;
1445         }
1446
1447         /**
1448          * Returns a default value to be used for $wgDefaultSkin: normally the one set in DefaultSettings,
1449          * but will fall back to another if the default skin is missing and some other one is present
1450          * instead.
1451          *
1452          * @param string[] $skinNames Names of installed skins.
1453          * @return string
1454          */
1455         public function getDefaultSkin( array $skinNames ) {
1456                 $defaultSkin = $GLOBALS['wgDefaultSkin'];
1457                 if ( !$skinNames || in_array( $defaultSkin, $skinNames ) ) {
1458                         return $defaultSkin;
1459                 } else {
1460                         return $skinNames[0];
1461                 }
1462         }
1463
1464         /**
1465          * Installs the auto-detected extensions.
1466          *
1467          * @return Status
1468          */
1469         protected function includeExtensions() {
1470                 global $IP;
1471                 $exts = $this->getVar( '_Extensions' );
1472                 $IP = $this->getVar( 'IP' );
1473
1474                 /**
1475                  * We need to include DefaultSettings before including extensions to avoid
1476                  * warnings about unset variables. However, the only thing we really
1477                  * want here is $wgHooks['LoadExtensionSchemaUpdates']. This won't work
1478                  * if the extension has hidden hook registration in $wgExtensionFunctions,
1479                  * but we're not opening that can of worms
1480                  * @see https://phabricator.wikimedia.org/T28857
1481                  */
1482                 global $wgAutoloadClasses;
1483                 $wgAutoloadClasses = array();
1484                 $queue = array();
1485
1486                 require "$IP/includes/DefaultSettings.php";
1487
1488                 foreach ( $exts as $e ) {
1489                         if ( file_exists( "$IP/extensions/$e/extension.json" ) ) {
1490                                 $queue["$IP/extensions/$e/extension.json"] = 1;
1491                         } else {
1492                                 require_once "$IP/extensions/$e/$e.php";
1493                         }
1494                 }
1495
1496                 $registry = new ExtensionRegistry();
1497                 $data = $registry->readFromQueue( $queue );
1498                 $wgAutoloadClasses += $data['autoload'];
1499
1500                 $hooksWeWant = isset( $wgHooks['LoadExtensionSchemaUpdates'] ) ?
1501                         $wgHooks['LoadExtensionSchemaUpdates'] : array();
1502
1503                 if ( isset( $data['globals']['wgHooks']['LoadExtensionSchemaUpdates'] ) ) {
1504                         $hooksWeWant = array_merge_recursive(
1505                                 $hooksWeWant,
1506                                 $data['globals']['wgHooks']['LoadExtensionSchemaUpdates']
1507                         );
1508                 }
1509                 // Unset everyone else's hooks. Lord knows what someone might be doing
1510                 // in ParserFirstCallInit (see bug 27171)
1511                 $GLOBALS['wgHooks'] = array( 'LoadExtensionSchemaUpdates' => $hooksWeWant );
1512
1513                 return Status::newGood();
1514         }
1515
1516         /**
1517          * Get an array of install steps. Should always be in the format of
1518          * array(
1519          *   'name'     => 'someuniquename',
1520          *   'callback' => array( $obj, 'method' ),
1521          * )
1522          * There must be a config-install-$name message defined per step, which will
1523          * be shown on install.
1524          *
1525          * @param DatabaseInstaller $installer DatabaseInstaller so we can make callbacks
1526          * @return array
1527          */
1528         protected function getInstallSteps( DatabaseInstaller $installer ) {
1529                 $coreInstallSteps = array(
1530                         array( 'name' => 'database', 'callback' => array( $installer, 'setupDatabase' ) ),
1531                         array( 'name' => 'tables', 'callback' => array( $installer, 'createTables' ) ),
1532                         array( 'name' => 'interwiki', 'callback' => array( $installer, 'populateInterwikiTable' ) ),
1533                         array( 'name' => 'stats', 'callback' => array( $this, 'populateSiteStats' ) ),
1534                         array( 'name' => 'keys', 'callback' => array( $this, 'generateKeys' ) ),
1535                         array( 'name' => 'updates', 'callback' => array( $installer, 'insertUpdateKeys' ) ),
1536                         array( 'name' => 'sysop', 'callback' => array( $this, 'createSysop' ) ),
1537                         array( 'name' => 'mainpage', 'callback' => array( $this, 'createMainpage' ) ),
1538                 );
1539
1540                 // Build the array of install steps starting from the core install list,
1541                 // then adding any callbacks that wanted to attach after a given step
1542                 foreach ( $coreInstallSteps as $step ) {
1543                         $this->installSteps[] = $step;
1544                         if ( isset( $this->extraInstallSteps[$step['name']] ) ) {
1545                                 $this->installSteps = array_merge(
1546                                         $this->installSteps,
1547                                         $this->extraInstallSteps[$step['name']]
1548                                 );
1549                         }
1550                 }
1551
1552                 // Prepend any steps that want to be at the beginning
1553                 if ( isset( $this->extraInstallSteps['BEGINNING'] ) ) {
1554                         $this->installSteps = array_merge(
1555                                 $this->extraInstallSteps['BEGINNING'],
1556                                 $this->installSteps
1557                         );
1558                 }
1559
1560                 // Extensions should always go first, chance to tie into hooks and such
1561                 if ( count( $this->getVar( '_Extensions' ) ) ) {
1562                         array_unshift( $this->installSteps,
1563                                 array( 'name' => 'extensions', 'callback' => array( $this, 'includeExtensions' ) )
1564                         );
1565                         $this->installSteps[] = array(
1566                                 'name' => 'extension-tables',
1567                                 'callback' => array( $installer, 'createExtensionTables' )
1568                         );
1569                 }
1570
1571                 return $this->installSteps;
1572         }
1573
1574         /**
1575          * Actually perform the installation.
1576          *
1577          * @param callable $startCB A callback array for the beginning of each step
1578          * @param callable $endCB A callback array for the end of each step
1579          *
1580          * @return array Array of Status objects
1581          */
1582         public function performInstallation( $startCB, $endCB ) {
1583                 $installResults = array();
1584                 $installer = $this->getDBInstaller();
1585                 $installer->preInstall();
1586                 $steps = $this->getInstallSteps( $installer );
1587                 foreach ( $steps as $stepObj ) {
1588                         $name = $stepObj['name'];
1589                         call_user_func_array( $startCB, array( $name ) );
1590
1591                         // Perform the callback step
1592                         $status = call_user_func( $stepObj['callback'], $installer );
1593
1594                         // Output and save the results
1595                         call_user_func( $endCB, $name, $status );
1596                         $installResults[$name] = $status;
1597
1598                         // If we've hit some sort of fatal, we need to bail.
1599                         // Callback already had a chance to do output above.
1600                         if ( !$status->isOk() ) {
1601                                 break;
1602                         }
1603                 }
1604                 if ( $status->isOk() ) {
1605                         $this->setVar( '_InstallDone', true );
1606                 }
1607
1608                 return $installResults;
1609         }
1610
1611         /**
1612          * Generate $wgSecretKey. Will warn if we had to use an insecure random source.
1613          *
1614          * @return Status
1615          */
1616         public function generateKeys() {
1617                 $keys = array( 'wgSecretKey' => 64 );
1618                 if ( strval( $this->getVar( 'wgUpgradeKey' ) ) === '' ) {
1619                         $keys['wgUpgradeKey'] = 16;
1620                 }
1621
1622                 return $this->doGenerateKeys( $keys );
1623         }
1624
1625         /**
1626          * Generate a secret value for variables using our CryptRand generator.
1627          * Produce a warning if the random source was insecure.
1628          *
1629          * @param array $keys
1630          * @return Status
1631          */
1632         protected function doGenerateKeys( $keys ) {
1633                 $status = Status::newGood();
1634
1635                 $strong = true;
1636                 foreach ( $keys as $name => $length ) {
1637                         $secretKey = MWCryptRand::generateHex( $length, true );
1638                         if ( !MWCryptRand::wasStrong() ) {
1639                                 $strong = false;
1640                         }
1641
1642                         $this->setVar( $name, $secretKey );
1643                 }
1644
1645                 if ( !$strong ) {
1646                         $names = array_keys( $keys );
1647                         $names = preg_replace( '/^(.*)$/', '\$$1', $names );
1648                         global $wgLang;
1649                         $status->warning( 'config-insecure-keys', $wgLang->listToText( $names ), count( $names ) );
1650                 }
1651
1652                 return $status;
1653         }
1654
1655         /**
1656          * Create the first user account, grant it sysop and bureaucrat rights
1657          *
1658          * @return Status
1659          */
1660         protected function createSysop() {
1661                 $name = $this->getVar( '_AdminName' );
1662                 $user = User::newFromName( $name );
1663
1664                 if ( !$user ) {
1665                         // We should've validated this earlier anyway!
1666                         return Status::newFatal( 'config-admin-error-user', $name );
1667                 }
1668
1669                 if ( $user->idForName() == 0 ) {
1670                         $user->addToDatabase();
1671
1672                         try {
1673                                 $user->setPassword( $this->getVar( '_AdminPassword' ) );
1674                         } catch ( PasswordError $pwe ) {
1675                                 return Status::newFatal( 'config-admin-error-password', $name, $pwe->getMessage() );
1676                         }
1677
1678                         $user->addGroup( 'sysop' );
1679                         $user->addGroup( 'bureaucrat' );
1680                         if ( $this->getVar( '_AdminEmail' ) ) {
1681                                 $user->setEmail( $this->getVar( '_AdminEmail' ) );
1682                         }
1683                         $user->saveSettings();
1684
1685                         // Update user count
1686                         $ssUpdate = new SiteStatsUpdate( 0, 0, 0, 0, 1 );
1687                         $ssUpdate->doUpdate();
1688                 }
1689                 $status = Status::newGood();
1690
1691                 if ( $this->getVar( '_Subscribe' ) && $this->getVar( '_AdminEmail' ) ) {
1692                         $this->subscribeToMediaWikiAnnounce( $status );
1693                 }
1694
1695                 return $status;
1696         }
1697
1698         /**
1699          * @param Status $s
1700          */
1701         private function subscribeToMediaWikiAnnounce( Status $s ) {
1702                 $params = array(
1703                         'email' => $this->getVar( '_AdminEmail' ),
1704                         'language' => 'en',
1705                         'digest' => 0
1706                 );
1707
1708                 // Mailman doesn't support as many languages as we do, so check to make
1709                 // sure their selected language is available
1710                 $myLang = $this->getVar( '_UserLang' );
1711                 if ( in_array( $myLang, $this->mediaWikiAnnounceLanguages ) ) {
1712                         $myLang = $myLang == 'pt-br' ? 'pt_BR' : $myLang; // rewrite to Mailman's pt_BR
1713                         $params['language'] = $myLang;
1714                 }
1715
1716                 if ( MWHttpRequest::canMakeRequests() ) {
1717                         $res = MWHttpRequest::factory( $this->mediaWikiAnnounceUrl,
1718                                 array( 'method' => 'POST', 'postData' => $params ), __METHOD__ )->execute();
1719                         if ( !$res->isOK() ) {
1720                                 $s->warning( 'config-install-subscribe-fail', $res->getMessage() );
1721                         }
1722                 } else {
1723                         $s->warning( 'config-install-subscribe-notpossible' );
1724                 }
1725         }
1726
1727         /**
1728          * Insert Main Page with default content.
1729          *
1730          * @param DatabaseInstaller $installer
1731          * @return Status
1732          */
1733         protected function createMainpage( DatabaseInstaller $installer ) {
1734                 $status = Status::newGood();
1735                 try {
1736                         $page = WikiPage::factory( Title::newMainPage() );
1737                         $content = new WikitextContent(
1738                                 wfMessage( 'mainpagetext' )->inContentLanguage()->text() . "\n\n" .
1739                                 wfMessage( 'mainpagedocfooter' )->inContentLanguage()->text()
1740                         );
1741
1742                         $page->doEditContent( $content,
1743                                 '',
1744                                 EDIT_NEW,
1745                                 false,
1746                                 User::newFromName( 'MediaWiki default' )
1747                         );
1748                 } catch ( Exception $e ) {
1749                         // using raw, because $wgShowExceptionDetails can not be set yet
1750                         $status->fatal( 'config-install-mainpage-failed', $e->getMessage() );
1751                 }
1752
1753                 return $status;
1754         }
1755
1756         /**
1757          * Override the necessary bits of the config to run an installation.
1758          */
1759         public static function overrideConfig() {
1760                 define( 'MW_NO_SESSION', 1 );
1761
1762                 // Don't access the database
1763                 $GLOBALS['wgUseDatabaseMessages'] = false;
1764                 // Don't cache langconv tables
1765                 $GLOBALS['wgLanguageConverterCacheType'] = CACHE_NONE;
1766                 // Debug-friendly
1767                 $GLOBALS['wgShowExceptionDetails'] = true;
1768                 // Don't break forms
1769                 $GLOBALS['wgExternalLinkTarget'] = '_blank';
1770
1771                 // Extended debugging
1772                 $GLOBALS['wgShowSQLErrors'] = true;
1773                 $GLOBALS['wgShowDBErrorBacktrace'] = true;
1774
1775                 // Allow multiple ob_flush() calls
1776                 $GLOBALS['wgDisableOutputCompression'] = true;
1777
1778                 // Use a sensible cookie prefix (not my_wiki)
1779                 $GLOBALS['wgCookiePrefix'] = 'mw_installer';
1780
1781                 // Some of the environment checks make shell requests, remove limits
1782                 $GLOBALS['wgMaxShellMemory'] = 0;
1783         }
1784
1785         /**
1786          * Add an installation step following the given step.
1787          *
1788          * @param callable $callback A valid installation callback array, in this form:
1789          *    array( 'name' => 'some-unique-name', 'callback' => array( $obj, 'function' ) );
1790          * @param string $findStep The step to find. Omit to put the step at the beginning
1791          */
1792         public function addInstallStep( $callback, $findStep = 'BEGINNING' ) {
1793                 $this->extraInstallSteps[$findStep][] = $callback;
1794         }
1795
1796         /**
1797          * Disable the time limit for execution.
1798          * Some long-running pages (Install, Upgrade) will want to do this
1799          */
1800         protected function disableTimeLimit() {
1801                 MediaWiki\suppressWarnings();
1802                 set_time_limit( 0 );
1803                 MediaWiki\restoreWarnings();
1804         }
1805 }