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         );
 227
 228         /**
 229          * The actual list of installation steps. This will be initialized by getInstallSteps()
 230          *
 231          * @var array
 232          */
 233         private $installSteps = array();
 234
 235         /**
 236          * Extra steps for installation, for things like DatabaseInstallers to modify
 237          *
 238          * @var array
 239          */
 240         protected $extraInstallSteps = array();
 241
 242         /**
 243          * Known object cache types and the functions used to test for their existence.
 244          *
 245          * @var array
 246          */
 247         protected $objectCaches = array(
 248                 'xcache' => 'xcache_get',
 249                 'apc' => 'apc_fetch',
 250                 'wincache' => 'wincache_ucache_get'
 251         );
 252
 253         /**
 254          * User rights profiles.
 255          *
 256          * @var array
 257          */
 258         public $rightsProfiles = array(
 259                 'wiki' => array(),
 260                 'no-anon' => array(
 261                         '*' => array( 'edit' => false )
 262                 ),
 263                 'fishbowl' => array(
 264                         '*' => array(
 265                                 'createaccount' => false,
 266                                 'edit' => false,
 267                         ),
 268                 ),
 269                 'private' => array(
 270                         '*' => array(
 271                                 'createaccount' => false,
 272                                 'edit' => false,
 273                                 'read' => false,
 274                         ),
 275                 ),
 276         );
 277
 278         /**
 279          * License types.
 280          *
 281          * @var array
 282          */
 283         public $licenses = array(
 284                 'cc-by' => array(
 285                         'url' => 'https://creativecommons.org/licenses/by/4.0/',
 286                         'icon' => '$wgResourceBasePath/resources/assets/licenses/cc-by.png',
 287                 ),
 288                 'cc-by-sa' => array(
 289                         'url' => 'https://creativecommons.org/licenses/by-sa/4.0/',
 290                         'icon' => '$wgResourceBasePath/resources/assets/licenses/cc-by-sa.png',
 291                 ),
 292                 'cc-by-nc-sa' => array(
 293                         'url' => 'https://creativecommons.org/licenses/by-nc-sa/4.0/',
 294                         'icon' => '$wgResourceBasePath/resources/assets/licenses/cc-by-nc-sa.png',
 295                 ),
 296                 'cc-0' => array(
 297                         'url' => 'https://creativecommons.org/publicdomain/zero/1.0/',
 298                         'icon' => '$wgResourceBasePath/resources/assets/licenses/cc-0.png',
 299                 ),
 300                 'pd' => array(
 301                         'url' => '',
 302                         'icon' => '$wgResourceBasePath/resources/assets/licenses/public-domain.png',
 303                 ),
 304                 'gfdl' => array(
 305                         'url' => 'https://www.gnu.org/copyleft/fdl.html',
 306                         'icon' => '$wgResourceBasePath/resources/assets/licenses/gnu-fdl.png',
 307                 ),
 308                 'none' => array(
 309                         'url' => '',
 310                         'icon' => '',
 311                         'text' => ''
 312                 ),
 313                 'cc-choose' => array(
 314                         // Details will be filled in by the selector.
 315                         'url' => '',
 316                         'icon' => '',
 317                         'text' => '',
 318                 ),
 319         );
 320
 321         /**
 322          * URL to mediawiki-announce subscription
 323          */
 324         protected $mediaWikiAnnounceUrl =
 325                 'https://lists.wikimedia.org/mailman/subscribe/mediawiki-announce';
 326
 327         /**
 328          * Supported language codes for Mailman
 329          */
 330         protected $mediaWikiAnnounceLanguages = array(
 331                 'ca', 'cs', 'da', 'de', 'en', 'es', 'et', 'eu', 'fi', 'fr', 'hr', 'hu',
 332                 'it', 'ja', 'ko', 'lt', 'nl', 'no', 'pl', 'pt', 'pt-br', 'ro', 'ru',
 333                 'sl', 'sr', 'sv', 'tr', 'uk'
 334         );
 335
 336         /**
 337          * UI interface for displaying a short message
 338          * The parameters are like parameters to wfMessage().
 339          * The messages will be in wikitext format, which will be converted to an
 340          * output format such as HTML or text before being sent to the user.
 341          * @param string $msg
 342          */
 343         abstract public function showMessage( $msg /*, ... */ );
 344
 345         /**
 346          * Same as showMessage(), but for displaying errors
 347          * @param string $msg
 348          */
 349         abstract public function showError( $msg /*, ... */ );
 350
 351         /**
 352          * Show a message to the installing user by using a Status object
 353          * @param Status $status
 354          */
 355         abstract public function showStatusMessage( Status $status );
 356
 357         /**
 358          * Constructor, always call this from child classes.
 359          */
 360         public function __construct() {
 361                 global $wgMessagesDirs, $wgUser;
 362
 363                 // Disable the i18n cache
 364                 Language::getLocalisationCache()->disableBackend();
 365                 // Disable LoadBalancer and wfGetDB etc.
 366                 LBFactory::disableBackend();
 367
 368                 // Disable object cache (otherwise CACHE_ANYTHING will try CACHE_DB and
 369                 // SqlBagOStuff will then throw since we just disabled wfGetDB)
 370                 $GLOBALS['wgMemc'] = new EmptyBagOStuff;
 371                 ObjectCache::clear();
 372                 $emptyCache = array( 'class' => 'EmptyBagOStuff' );
 373                 // disable (problematic) object cache types explicitly, preserving all other (working) ones
 374                 // bug T113843
 375                 $GLOBALS['wgObjectCaches'] = array(
 376                         CACHE_NONE => $emptyCache,
 377                         CACHE_DB => $emptyCache,
 378                         CACHE_ANYTHING => $emptyCache,
 379                         CACHE_MEMCACHED => $emptyCache,
 380                 ) + $GLOBALS['wgObjectCaches'];
 381
 382                 // Load the installer's i18n.
 383                 $wgMessagesDirs['MediawikiInstaller'] = __DIR__ . '/i18n';
 384
 385                 // Having a user with id = 0 safeguards us from DB access via User::loadOptions().
 386                 $wgUser = User::newFromId( 0 );
 387
 388                 $this->settings = $this->internalDefaults;
 389
 390                 foreach ( $this->defaultVarNames as $var ) {
 391                         $this->settings[$var] = $GLOBALS[$var];
 392                 }
 393
 394                 $this->doEnvironmentPreps();
 395
 396                 $this->compiledDBs = array();
 397                 foreach ( self::getDBTypes() as $type ) {
 398                         $installer = $this->getDBInstaller( $type );
 399
 400                         if ( !$installer->isCompiled() ) {
 401                                 continue;
 402                         }
 403                         $this->compiledDBs[] = $type;
 404                 }
 405
 406                 $this->parserTitle = Title::newFromText( 'Installer' );
 407                 $this->parserOptions = new ParserOptions; // language will be wrong :(
 408                 $this->parserOptions->setEditSection( false );
 409         }
 410
 411         /**
 412          * Get a list of known DB types.
 413          *
 414          * @return array
 415          */
 416         public static function getDBTypes() {
 417                 return self::$dbTypes;
 418         }
 419
 420         /**
 421          * Do initial checks of the PHP environment. Set variables according to
 422          * the observed environment.
 423          *
 424          * It's possible that this may be called under the CLI SAPI, not the SAPI
 425          * that the wiki will primarily run under. In that case, the subclass should
 426          * initialise variables such as wgScriptPath, before calling this function.
 427          *
 428          * Under the web subclass, it can already be assumed that PHP 5+ is in use
 429          * and that sessions are working.
 430          *
 431          * @return Status
 432          */
 433         public function doEnvironmentChecks() {
 434                 // Php version has already been checked by entry scripts
 435                 // Show message here for information purposes
 436                 if ( wfIsHHVM() ) {
 437                         $this->showMessage( 'config-env-hhvm', HHVM_VERSION );
 438                 } else {
 439                         $this->showMessage( 'config-env-php', PHP_VERSION );
 440                 }
 441
 442                 $good = true;
 443                 // Must go here because an old version of PCRE can prevent other checks from completing
 444                 list( $pcreVersion ) = explode( ' ', PCRE_VERSION, 2 );
 445                 if ( version_compare( $pcreVersion, self::MINIMUM_PCRE_VERSION, '<' ) ) {
 446                         $this->showError( 'config-pcre-old', self::MINIMUM_PCRE_VERSION, $pcreVersion );
 447                         $good = false;
 448                 } else {
 449                         foreach ( $this->envChecks as $check ) {
 450                                 $status = $this->$check();
 451                                 if ( $status === false ) {
 452                                         $good = false;
 453                                 }
 454                         }
 455                 }
 456
 457                 $this->setVar( '_Environment', $good );
 458
 459                 return $good ? Status::newGood() : Status::newFatal( 'config-env-bad' );
 460         }
 461
 462         public function doEnvironmentPreps() {
 463                 foreach ( $this->envPreps as $prep ) {
 464                         $this->$prep();
 465                 }
 466         }
 467
 468         /**
 469          * Set a MW configuration variable, or internal installer configuration variable.
 470          *
 471          * @param string $name
 472          * @param mixed $value
 473          */
 474         public function setVar( $name, $value ) {
 475                 $this->settings[$name] = $value;
 476         }
 477
 478         /**
 479          * Get an MW configuration variable, or internal installer configuration variable.
 480          * The defaults come from $GLOBALS (ultimately DefaultSettings.php).
 481          * Installer variables are typically prefixed by an underscore.
 482          *
 483          * @param string $name
 484          * @param mixed $default
 485          *
 486          * @return mixed
 487          */
 488         public function getVar( $name, $default = null ) {
 489                 if ( !isset( $this->settings[$name] ) ) {
 490                         return $default;
 491                 } else {
 492                         return $this->settings[$name];
 493                 }
 494         }
 495
 496         /**
 497          * Get a list of DBs supported by current PHP setup
 498          *
 499          * @return array
 500          */
 501         public function getCompiledDBs() {
 502                 return $this->compiledDBs;
 503         }
 504
 505         /**
 506          * Get an instance of DatabaseInstaller for the specified DB type.
 507          *
 508          * @param mixed $type DB installer for which is needed, false to use default.
 509          *
 510          * @return DatabaseInstaller
 511          */
 512         public function getDBInstaller( $type = false ) {
 513                 if ( !$type ) {
 514                         $type = $this->getVar( 'wgDBtype' );
 515                 }
 516
 517                 $type = strtolower( $type );
 518
 519                 if ( !isset( $this->dbInstallers[$type] ) ) {
 520                         $class = ucfirst( $type ) . 'Installer';
 521                         $this->dbInstallers[$type] = new $class( $this );
 522                 }
 523
 524                 return $this->dbInstallers[$type];
 525         }
 526
 527         /**
 528          * Determine if LocalSettings.php exists. If it does, return its variables.
 529          *
 530          * @return array
 531          */
 532         public static function getExistingLocalSettings() {
 533                 global $IP;
 534
 535                 // You might be wondering why this is here. Well if you don't do this
 536                 // then some poorly-formed extensions try to call their own classes
 537                 // after immediately registering them. We really need to get extension
 538                 // registration out of the global scope and into a real format.
 539                 // @see https://phabricator.wikimedia.org/T69440
 540                 global $wgAutoloadClasses;
 541                 $wgAutoloadClasses = array();
 542
 543                 // @codingStandardsIgnoreStart
 544                 // LocalSettings.php should not call functions, except wfLoadSkin/wfLoadExtensions
 545                 // Define the required globals here, to ensure, the functions can do it work correctly.
 546                 global $wgExtensionDirectory, $wgStyleDirectory;
 547                 // @codingStandardsIgnoreEnd
 548
 549                 MediaWiki\suppressWarnings();
 550                 $_lsExists = file_exists( "$IP/LocalSettings.php" );
 551                 MediaWiki\restoreWarnings();
 552
 553                 if ( !$_lsExists ) {
 554                         return false;
 555                 }
 556                 unset( $_lsExists );
 557
 558                 require "$IP/includes/DefaultSettings.php";
 559                 require "$IP/LocalSettings.php";
 560
 561                 return get_defined_vars();
 562         }
 563
 564         /**
 565          * Get a fake password for sending back to the user in HTML.
 566          * This is a security mechanism to avoid compromise of the password in the
 567          * event of session ID compromise.
 568          *
 569          * @param string $realPassword
 570          *
 571          * @return string
 572          */
 573         public function getFakePassword( $realPassword ) {
 574                 return str_repeat( '*', strlen( $realPassword ) );
 575         }
 576
 577         /**
 578          * Set a variable which stores a password, except if the new value is a
 579          * fake password in which case leave it as it is.
 580          *
 581          * @param string $name
 582          * @param mixed $value
 583          */
 584         public function setPassword( $name, $value ) {
 585                 if ( !preg_match( '/^\*+$/', $value ) ) {
 586                         $this->setVar( $name, $value );
 587                 }
 588         }
 589
 590         /**
 591          * On POSIX systems return the primary group of the webserver we're running under.
 592          * On other systems just returns null.
 593          *
 594          * This is used to advice the user that he should chgrp his mw-config/data/images directory as the
 595          * webserver user before he can install.
 596          *
 597          * Public because SqliteInstaller needs it, and doesn't subclass Installer.
 598          *
 599          * @return mixed
 600          */
 601         public static function maybeGetWebserverPrimaryGroup() {
 602                 if ( !function_exists( 'posix_getegid' ) || !function_exists( 'posix_getpwuid' ) ) {
 603                         # I don't know this, this isn't UNIX.
 604                         return null;
 605                 }
 606
 607                 # posix_getegid() *not* getmygid() because we want the group of the webserver,
 608                 # not whoever owns the current script.
 609                 $gid = posix_getegid();
 610                 $getpwuid = posix_getpwuid( $gid );
 611                 $group = $getpwuid['name'];
 612
 613                 return $group;
 614         }
 615
 616         /**
 617          * Convert wikitext $text to HTML.
 618          *
 619          * This is potentially error prone since many parser features require a complete
 620          * installed MW database. The solution is to just not use those features when you
 621          * write your messages. This appears to work well enough. Basic formatting and
 622          * external links work just fine.
 623          *
 624          * But in case a translator decides to throw in a "#ifexist" or internal link or
 625          * whatever, this function is guarded to catch the attempted DB access and to present
 626          * some fallback text.
 627          *
 628          * @param string $text
 629          * @param bool $lineStart
 630          * @return string
 631          */
 632         public function parse( $text, $lineStart = false ) {
 633                 global $wgParser;
 634
 635                 try {
 636                         $out = $wgParser->parse( $text, $this->parserTitle, $this->parserOptions, $lineStart );
 637                         $html = $out->getText();
 638                 } catch ( DBAccessError $e ) {
 639                         $html = '<!--DB access attempted during parse-->  ' . htmlspecialchars( $text );
 640
 641                         if ( !empty( $this->debug ) ) {
 642                                 $html .= "<!--\n" . $e->getTraceAsString() . "\n-->";
 643                         }
 644                 }
 645
 646                 return $html;
 647         }
 648
 649         /**
 650          * @return ParserOptions
 651          */
 652         public function getParserOptions() {
 653                 return $this->parserOptions;
 654         }
 655
 656         public function disableLinkPopups() {
 657                 $this->parserOptions->setExternalLinkTarget( false );
 658         }
 659
 660         public function restoreLinkPopups() {
 661                 global $wgExternalLinkTarget;
 662                 $this->parserOptions->setExternalLinkTarget( $wgExternalLinkTarget );
 663         }
 664
 665         /**
 666          * Install step which adds a row to the site_stats table with appropriate
 667          * initial values.
 668          *
 669          * @param DatabaseInstaller $installer
 670          *
 671          * @return Status
 672          */
 673         public function populateSiteStats( DatabaseInstaller $installer ) {
 674                 $status = $installer->getConnection();
 675                 if ( !$status->isOK() ) {
 676                         return $status;
 677                 }
 678                 $status->value->insert(
 679                         'site_stats',
 680                         array(
 681                                 'ss_row_id' => 1,
 682                                 'ss_total_edits' => 0,
 683                                 'ss_good_articles' => 0,
 684                                 'ss_total_pages' => 0,
 685                                 'ss_users' => 0,
 686                                 'ss_images' => 0
 687                         ),
 688                         __METHOD__, 'IGNORE'
 689                 );
 690
 691                 return Status::newGood();
 692         }
 693
 694         /**
 695          * Environment check for DB types.
 696          * @return bool
 697          */
 698         protected function envCheckDB() {
 699                 global $wgLang;
 700
 701                 $allNames = array();
 702
 703                 // Messages: config-type-mysql, config-type-postgres, config-type-oracle,
 704                 // config-type-sqlite
 705                 foreach ( self::getDBTypes() as $name ) {
 706                         $allNames[] = wfMessage( "config-type-$name" )->text();
 707                 }
 708
 709                 $databases = $this->getCompiledDBs();
 710
 711                 $databases = array_flip( $databases );
 712                 foreach ( array_keys( $databases ) as $db ) {
 713                         $installer = $this->getDBInstaller( $db );
 714                         $status = $installer->checkPrerequisites();
 715                         if ( !$status->isGood() ) {
 716                                 $this->showStatusMessage( $status );
 717                         }
 718                         if ( !$status->isOK() ) {
 719                                 unset( $databases[$db] );
 720                         }
 721                 }
 722                 $databases = array_flip( $databases );
 723                 if ( !$databases ) {
 724                         $this->showError( 'config-no-db', $wgLang->commaList( $allNames ), count( $allNames ) );
 725
 726                         // @todo FIXME: This only works for the web installer!
 727                         return false;
 728                 }
 729
 730                 return true;
 731         }
 732
 733         /**
 734          * Environment check for register_globals.
 735          * Prevent installation if enabled
 736          * @return bool
 737          */
 738         protected function envCheckRegisterGlobals() {
 739                 if ( wfIniGetBool( 'register_globals' ) ) {
 740                         $this->showMessage( 'config-register-globals-error' );
 741                         return false;
 742                 }
 743
 744                 return true;
 745         }
 746
 747         /**
 748          * Some versions of libxml+PHP break < and > encoding horribly
 749          * @return bool
 750          */
 751         protected function envCheckBrokenXML() {
 752                 $test = new PhpXmlBugTester();
 753                 if ( !$test->ok ) {
 754                         $this->showError( 'config-brokenlibxml' );
 755
 756                         return false;
 757                 }
 758
 759                 return true;
 760         }
 761
 762         /**
 763          * Environment check for magic_quotes_(gpc|runtime|sybase).
 764          * @return bool
 765          */
 766         protected function envCheckMagicQuotes() {
 767                 $status = true;
 768                 foreach ( array( 'gpc', 'runtime', 'sybase' ) as $magicJunk ) {
 769                         if ( wfIniGetBool( "magic_quotes_$magicJunk" ) ) {
 770                                 $this->showError( "config-magic-quotes-$magicJunk" );
 771                                 $status = false;
 772                         }
 773                 }
 774
 775                 return $status;
 776         }
 777
 778         /**
 779          * Environment check for mbstring.func_overload.
 780          * @return bool
 781          */
 782         protected function envCheckMbstring() {
 783                 if ( wfIniGetBool( 'mbstring.func_overload' ) ) {
 784                         $this->showError( 'config-mbstring' );
 785
 786                         return false;
 787                 }
 788
 789                 return true;
 790         }
 791
 792         /**
 793          * Environment check for safe_mode.
 794          * @return bool
 795          */
 796         protected function envCheckSafeMode() {
 797                 if ( wfIniGetBool( 'safe_mode' ) ) {
 798                         $this->setVar( '_SafeMode', true );
 799                         $this->showMessage( 'config-safe-mode' );
 800                 }
 801
 802                 return true;
 803         }
 804
 805         /**
 806          * Environment check for the XML module.
 807          * @return bool
 808          */
 809         protected function envCheckXML() {
 810                 if ( !function_exists( "utf8_encode" ) ) {
 811                         $this->showError( 'config-xml-bad' );
 812
 813                         return false;
 814                 }
 815
 816                 return true;
 817         }
 818
 819         /**
 820          * Environment check for the PCRE module.
 821          *
 822          * @note If this check were to fail, the parser would
 823          *   probably throw an exception before the result
 824          *   of this check is shown to the user.
 825          * @return bool
 826          */
 827         protected function envCheckPCRE() {
 828                 MediaWiki\suppressWarnings();
 829                 $regexd = preg_replace( '/[\x{0430}-\x{04FF}]/iu', '', '-АБВГД-' );
 830                 // Need to check for \p support too, as PCRE can be compiled
 831                 // with utf8 support, but not unicode property support.
 832                 // check that \p{Zs} (space separators) matches
 833                 // U+3000 (Ideographic space)
 834                 $regexprop = preg_replace( '/\p{Zs}/u', '', "-\xE3\x80\x80-" );
 835                 MediaWiki\restoreWarnings();
 836                 if ( $regexd != '--' || $regexprop != '--' ) {
 837                         $this->showError( 'config-pcre-no-utf8' );
 838
 839                         return false;
 840                 }
 841
 842                 return true;
 843         }
 844
 845         /**
 846          * Environment check for available memory.
 847          * @return bool
 848          */
 849         protected function envCheckMemory() {
 850                 $limit = ini_get( 'memory_limit' );
 851
 852                 if ( !$limit || $limit == -1 ) {
 853                         return true;
 854                 }
 855
 856                 $n = wfShorthandToInteger( $limit );
 857
 858                 if ( $n < $this->minMemorySize * 1024 * 1024 ) {
 859                         $newLimit = "{$this->minMemorySize}M";
 860
 861                         if ( ini_set( "memory_limit", $newLimit ) === false ) {
 862                                 $this->showMessage( 'config-memory-bad', $limit );
 863                         } else {
 864                                 $this->showMessage( 'config-memory-raised', $limit, $newLimit );
 865                                 $this->setVar( '_RaiseMemory', true );
 866                         }
 867                 }
 868
 869                 return true;
 870         }
 871
 872         /**
 873          * Environment check for compiled object cache types.
 874          */
 875         protected function envCheckCache() {
 876                 $caches = array();
 877                 foreach ( $this->objectCaches as $name => $function ) {
 878                         if ( function_exists( $function ) ) {
 879                                 if ( $name == 'xcache' && !wfIniGetBool( 'xcache.var_size' ) ) {
 880                                         continue;
 881                                 }
 882                                 $caches[$name] = true;
 883                         }
 884                 }
 885
 886                 if ( !$caches ) {
 887                         $key = 'config-no-cache';
 888                         // PHP >=5.5 is called APCu, earlier versions use APC (T61998).
 889                         if ( !wfIsHHVM() && version_compare( PHP_VERSION, '5.5', '>=' ) ) {
 890                                 // config-no-cache-apcu
 891                                 $key .= '-apcu';
 892                         }
 893                         $this->showMessage( $key );
 894                 }
 895
 896                 $this->setVar( '_Caches', $caches );
 897         }
 898
 899         /**
 900          * Scare user to death if they have mod_security or mod_security2
 901          * @return bool
 902          */
 903         protected function envCheckModSecurity() {
 904                 if ( self::apacheModulePresent( 'mod_security' )
 905                         || self::apacheModulePresent( 'mod_security2' ) ) {
 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                 /**
1145                  * This needs to be updated something that the latest libicu
1146                  * will properly normalize.  This normalization was found at
1147                  * http://www.unicode.org/versions/Unicode5.2.0/#Character_Additions
1148                  * Note that we use the hex representation to create the code
1149                  * points in order to avoid any Unicode-destroying during transit.
1150                  */
1151                 $not_normal_c = $this->unicodeChar( "FA6C" );
1152                 $normal_c = $this->unicodeChar( "242EE" );
1153
1154                 $useNormalizer = 'php';
1155                 $needsUpdate = false;
1156
1157                 if ( function_exists( 'normalizer_normalize' ) ) {
1158                         $useNormalizer = 'intl';
1159                         $intl = normalizer_normalize( $not_normal_c, Normalizer::FORM_C );
1160                         if ( $intl !== $normal_c ) {
1161                                 $needsUpdate = true;
1162                         }
1163                 }
1164
1165                 // Uses messages 'config-unicode-using-php' and 'config-unicode-using-intl'
1166                 if ( $useNormalizer === 'php' ) {
1167                         $this->showMessage( 'config-unicode-pure-php-warning' );
1168                 } else {
1169                         $this->showMessage( 'config-unicode-using-' . $useNormalizer );
1170                         if ( $needsUpdate ) {
1171                                 $this->showMessage( 'config-unicode-update-warning' );
1172                         }
1173                 }
1174         }
1175
1176         /**
1177          * @return bool
1178          */
1179         protected function envCheckCtype() {
1180                 if ( !function_exists( 'ctype_digit' ) ) {
1181                         $this->showError( 'config-ctype' );
1182
1183                         return false;
1184                 }
1185
1186                 return true;
1187         }
1188
1189         /**
1190          * @return bool
1191          */
1192         protected function envCheckIconv() {
1193                 if ( !function_exists( 'iconv' ) ) {
1194                         $this->showError( 'config-iconv' );
1195
1196                         return false;
1197                 }
1198
1199                 return true;
1200         }
1201
1202         /**
1203          * @return bool
1204          */
1205         protected function envCheckJSON() {
1206                 if ( !function_exists( 'json_decode' ) ) {
1207                         $this->showError( 'config-json' );
1208
1209                         return false;
1210                 }
1211
1212                 return true;
1213         }
1214
1215         /**
1216          * Environment prep for the server hostname.
1217          */
1218         protected function envPrepServer() {
1219                 $server = $this->envGetDefaultServer();
1220                 if ( $server !== null ) {
1221                         $this->setVar( 'wgServer', $server );
1222                 }
1223         }
1224
1225         /**
1226          * Helper function to be called from envPrepServer()
1227          * @return string
1228          */
1229         abstract protected function envGetDefaultServer();
1230
1231         /**
1232          * Environment prep for setting $IP and $wgScriptPath.
1233          */
1234         protected function envPrepPath() {
1235                 global $IP;
1236                 $IP = dirname( dirname( __DIR__ ) );
1237                 $this->setVar( 'IP', $IP );
1238         }
1239
1240         /**
1241          * Get an array of likely places we can find executables. Check a bunch
1242          * of known Unix-like defaults, as well as the PATH environment variable
1243          * (which should maybe make it work for Windows?)
1244          *
1245          * @return array
1246          */
1247         protected static function getPossibleBinPaths() {
1248                 return array_merge(
1249                         array( '/usr/bin', '/usr/local/bin', '/opt/csw/bin',
1250                                 '/usr/gnu/bin', '/usr/sfw/bin', '/sw/bin', '/opt/local/bin' ),
1251                         explode( PATH_SEPARATOR, getenv( 'PATH' ) )
1252                 );
1253         }
1254
1255         /**
1256          * Search a path for any of the given executable names. Returns the
1257          * executable name if found. Also checks the version string returned
1258          * by each executable.
1259          *
1260          * Used only by environment checks.
1261          *
1262          * @param string $path Path to search
1263          * @param array $names Array of executable names
1264          * @param array|bool $versionInfo False or array with two members:
1265          *   0 => Command to run for version check, with $1 for the full executable name
1266          *   1 => String to compare the output with
1267          *
1268          * If $versionInfo is not false, only executables with a version
1269          * matching $versionInfo[1] will be returned.
1270          * @return bool|string
1271          */
1272         public static function locateExecutable( $path, $names, $versionInfo = false ) {
1273                 if ( !is_array( $names ) ) {
1274                         $names = array( $names );
1275                 }
1276
1277                 foreach ( $names as $name ) {
1278                         $command = $path . DIRECTORY_SEPARATOR . $name;
1279
1280                         MediaWiki\suppressWarnings();
1281                         $file_exists = file_exists( $command );
1282                         MediaWiki\restoreWarnings();
1283
1284                         if ( $file_exists ) {
1285                                 if ( !$versionInfo ) {
1286                                         return $command;
1287                                 }
1288
1289                                 $file = str_replace( '$1', wfEscapeShellArg( $command ), $versionInfo[0] );
1290                                 if ( strstr( wfShellExec( $file ), $versionInfo[1] ) !== false ) {
1291                                         return $command;
1292                                 }
1293                         }
1294                 }
1295
1296                 return false;
1297         }
1298
1299         /**
1300          * Same as locateExecutable(), but checks in getPossibleBinPaths() by default
1301          * @see locateExecutable()
1302          * @param array $names Array of possible names.
1303          * @param array|bool $versionInfo Default: false or array with two members:
1304          *   0 => Command to run for version check, with $1 for the full executable name
1305          *   1 => String to compare the output with
1306          *
1307          * If $versionInfo is not false, only executables with a version
1308          * matching $versionInfo[1] will be returned.
1309          * @return bool|string
1310          */
1311         public static function locateExecutableInDefaultPaths( $names, $versionInfo = false ) {
1312                 foreach ( self::getPossibleBinPaths() as $path ) {
1313                         $exe = self::locateExecutable( $path, $names, $versionInfo );
1314                         if ( $exe !== false ) {
1315                                 return $exe;
1316                         }
1317                 }
1318
1319                 return false;
1320         }
1321
1322         /**
1323          * Checks if scripts located in the given directory can be executed via the given URL.
1324          *
1325          * Used only by environment checks.
1326          * @param string $dir
1327          * @param string $url
1328          * @return bool|int|string
1329          */
1330         public function dirIsExecutable( $dir, $url ) {
1331                 $scriptTypes = array(
1332                         'php' => array(
1333                                 "<?php echo 'ex' . 'ec';",
1334                                 "#!/var/env php5\n<?php echo 'ex' . 'ec';",
1335                         ),
1336                 );
1337
1338                 // it would be good to check other popular languages here, but it'll be slow.
1339
1340                 MediaWiki\suppressWarnings();
1341
1342                 foreach ( $scriptTypes as $ext => $contents ) {
1343                         foreach ( $contents as $source ) {
1344                                 $file = 'exectest.' . $ext;
1345
1346                                 if ( !file_put_contents( $dir . $file, $source ) ) {
1347                                         break;
1348                                 }
1349
1350                                 try {
1351                                         $text = Http::get( $url . $file, array( 'timeout' => 3 ), __METHOD__ );
1352                                 } catch ( Exception $e ) {
1353                                         // Http::get throws with allow_url_fopen = false and no curl extension.
1354                                         $text = null;
1355                                 }
1356                                 unlink( $dir . $file );
1357
1358                                 if ( $text == 'exec' ) {
1359                                         MediaWiki\restoreWarnings();
1360
1361                                         return $ext;
1362                                 }
1363                         }
1364                 }
1365
1366                 MediaWiki\restoreWarnings();
1367
1368                 return false;
1369         }
1370
1371         /**
1372          * Checks for presence of an Apache module. Works only if PHP is running as an Apache module, too.
1373          *
1374          * @param string $moduleName Name of module to check.
1375          * @return bool
1376          */
1377         public static function apacheModulePresent( $moduleName ) {
1378                 if ( function_exists( 'apache_get_modules' ) && in_array( $moduleName, apache_get_modules() ) ) {
1379                         return true;
1380                 }
1381                 // try it the hard way
1382                 ob_start();
1383                 phpinfo( INFO_MODULES );
1384                 $info = ob_get_clean();
1385
1386                 return strpos( $info, $moduleName ) !== false;
1387         }
1388
1389         /**
1390          * ParserOptions are constructed before we determined the language, so fix it
1391          *
1392          * @param Language $lang
1393          */
1394         public function setParserLanguage( $lang ) {
1395                 $this->parserOptions->setTargetLanguage( $lang );
1396                 $this->parserOptions->setUserLang( $lang );
1397         }
1398
1399         /**
1400          * Overridden by WebInstaller to provide lastPage parameters.
1401          * @param string $page
1402          * @return string
1403          */
1404         protected function getDocUrl( $page ) {
1405                 return "{$_SERVER['PHP_SELF']}?page=" . urlencode( $page );
1406         }
1407
1408         /**
1409          * Finds extensions that follow the format /$directory/Name/Name.php,
1410          * and returns an array containing the value for 'Name' for each found extension.
1411          *
1412          * Reasonable values for $directory include 'extensions' (the default) and 'skins'.
1413          *
1414          * @param string $directory Directory to search in
1415          * @return array
1416          */
1417         public function findExtensions( $directory = 'extensions' ) {
1418                 if ( $this->getVar( 'IP' ) === null ) {
1419                         return array();
1420                 }
1421
1422                 $extDir = $this->getVar( 'IP' ) . '/' . $directory;
1423                 if ( !is_readable( $extDir ) || !is_dir( $extDir ) ) {
1424                         return array();
1425                 }
1426
1427                 // extensions -> extension.json, skins -> skin.json
1428                 $jsonFile = substr( $directory, 0, strlen( $directory ) -1 ) . '.json';
1429
1430                 $dh = opendir( $extDir );
1431                 $exts = array();
1432                 while ( ( $file = readdir( $dh ) ) !== false ) {
1433                         if ( !is_dir( "$extDir/$file" ) ) {
1434                                 continue;
1435                         }
1436                         if ( file_exists( "$extDir/$file/$jsonFile" ) || file_exists( "$extDir/$file/$file.php" ) ) {
1437                                 $exts[] = $file;
1438                         }
1439                 }
1440                 closedir( $dh );
1441                 natcasesort( $exts );
1442
1443                 return $exts;
1444         }
1445
1446         /**
1447          * Returns a default value to be used for $wgDefaultSkin: normally the one set in DefaultSettings,
1448          * but will fall back to another if the default skin is missing and some other one is present
1449          * instead.
1450          *
1451          * @param string[] $skinNames Names of installed skins.
1452          * @return string
1453          */
1454         public function getDefaultSkin( array $skinNames ) {
1455                 $defaultSkin = $GLOBALS['wgDefaultSkin'];
1456                 if ( !$skinNames || in_array( $defaultSkin, $skinNames ) ) {
1457                         return $defaultSkin;
1458                 } else {
1459                         return $skinNames[0];
1460                 }
1461         }
1462
1463         /**
1464          * Installs the auto-detected extensions.
1465          *
1466          * @return Status
1467          */
1468         protected function includeExtensions() {
1469                 global $IP;
1470                 $exts = $this->getVar( '_Extensions' );
1471                 $IP = $this->getVar( 'IP' );
1472
1473                 /**
1474                  * We need to include DefaultSettings before including extensions to avoid
1475                  * warnings about unset variables. However, the only thing we really
1476                  * want here is $wgHooks['LoadExtensionSchemaUpdates']. This won't work
1477                  * if the extension has hidden hook registration in $wgExtensionFunctions,
1478                  * but we're not opening that can of worms
1479                  * @see https://phabricator.wikimedia.org/T28857
1480                  */
1481                 global $wgAutoloadClasses;
1482                 $wgAutoloadClasses = array();
1483                 $queue = array();
1484
1485                 require "$IP/includes/DefaultSettings.php";
1486
1487                 foreach ( $exts as $e ) {
1488                         if ( file_exists( "$IP/extensions/$e/extension.json" ) ) {
1489                                 $queue["$IP/extensions/$e/extension.json"] = 1;
1490                         } else {
1491                                 require_once "$IP/extensions/$e/$e.php";
1492                         }
1493                 }
1494
1495                 $registry = new ExtensionRegistry();
1496                 $data = $registry->readFromQueue( $queue );
1497                 $wgAutoloadClasses += $data['autoload'];
1498
1499                 $hooksWeWant = isset( $wgHooks['LoadExtensionSchemaUpdates'] ) ?
1500                         $wgHooks['LoadExtensionSchemaUpdates'] : array();
1501
1502                 if ( isset( $data['globals']['wgHooks']['LoadExtensionSchemaUpdates'] ) ) {
1503                         $hooksWeWant = array_merge_recursive(
1504                                 $hooksWeWant,
1505                                 $data['globals']['wgHooks']['LoadExtensionSchemaUpdates']
1506                         );
1507                 }
1508                 // Unset everyone else's hooks. Lord knows what someone might be doing
1509                 // in ParserFirstCallInit (see bug 27171)
1510                 $GLOBALS['wgHooks'] = array( 'LoadExtensionSchemaUpdates' => $hooksWeWant );
1511
1512                 return Status::newGood();
1513         }
1514
1515         /**
1516          * Get an array of install steps. Should always be in the format of
1517          * array(
1518          *   'name'     => 'someuniquename',
1519          *   'callback' => array( $obj, 'method' ),
1520          * )
1521          * There must be a config-install-$name message defined per step, which will
1522          * be shown on install.
1523          *
1524          * @param DatabaseInstaller $installer DatabaseInstaller so we can make callbacks
1525          * @return array
1526          */
1527         protected function getInstallSteps( DatabaseInstaller $installer ) {
1528                 $coreInstallSteps = array(
1529                         array( 'name' => 'database', 'callback' => array( $installer, 'setupDatabase' ) ),
1530                         array( 'name' => 'tables', 'callback' => array( $installer, 'createTables' ) ),
1531                         array( 'name' => 'interwiki', 'callback' => array( $installer, 'populateInterwikiTable' ) ),
1532                         array( 'name' => 'stats', 'callback' => array( $this, 'populateSiteStats' ) ),
1533                         array( 'name' => 'keys', 'callback' => array( $this, 'generateKeys' ) ),
1534                         array( 'name' => 'updates', 'callback' => array( $installer, 'insertUpdateKeys' ) ),
1535                         array( 'name' => 'sysop', 'callback' => array( $this, 'createSysop' ) ),
1536                         array( 'name' => 'mainpage', 'callback' => array( $this, 'createMainpage' ) ),
1537                 );
1538
1539                 // Build the array of install steps starting from the core install list,
1540                 // then adding any callbacks that wanted to attach after a given step
1541                 foreach ( $coreInstallSteps as $step ) {
1542                         $this->installSteps[] = $step;
1543                         if ( isset( $this->extraInstallSteps[$step['name']] ) ) {
1544                                 $this->installSteps = array_merge(
1545                                         $this->installSteps,
1546                                         $this->extraInstallSteps[$step['name']]
1547                                 );
1548                         }
1549                 }
1550
1551                 // Prepend any steps that want to be at the beginning
1552                 if ( isset( $this->extraInstallSteps['BEGINNING'] ) ) {
1553                         $this->installSteps = array_merge(
1554                                 $this->extraInstallSteps['BEGINNING'],
1555                                 $this->installSteps
1556                         );
1557                 }
1558
1559                 // Extensions should always go first, chance to tie into hooks and such
1560                 if ( count( $this->getVar( '_Extensions' ) ) ) {
1561                         array_unshift( $this->installSteps,
1562                                 array( 'name' => 'extensions', 'callback' => array( $this, 'includeExtensions' ) )
1563                         );
1564                         $this->installSteps[] = array(
1565                                 'name' => 'extension-tables',
1566                                 'callback' => array( $installer, 'createExtensionTables' )
1567                         );
1568                 }
1569
1570                 return $this->installSteps;
1571         }
1572
1573         /**
1574          * Actually perform the installation.
1575          *
1576          * @param callable $startCB A callback array for the beginning of each step
1577          * @param callable $endCB A callback array for the end of each step
1578          *
1579          * @return array Array of Status objects
1580          */
1581         public function performInstallation( $startCB, $endCB ) {
1582                 $installResults = array();
1583                 $installer = $this->getDBInstaller();
1584                 $installer->preInstall();
1585                 $steps = $this->getInstallSteps( $installer );
1586                 foreach ( $steps as $stepObj ) {
1587                         $name = $stepObj['name'];
1588                         call_user_func_array( $startCB, array( $name ) );
1589
1590                         // Perform the callback step
1591                         $status = call_user_func( $stepObj['callback'], $installer );
1592
1593                         // Output and save the results
1594                         call_user_func( $endCB, $name, $status );
1595                         $installResults[$name] = $status;
1596
1597                         // If we've hit some sort of fatal, we need to bail.
1598                         // Callback already had a chance to do output above.
1599                         if ( !$status->isOk() ) {
1600                                 break;
1601                         }
1602                 }
1603                 if ( $status->isOk() ) {
1604                         $this->setVar( '_InstallDone', true );
1605                 }
1606
1607                 return $installResults;
1608         }
1609
1610         /**
1611          * Generate $wgSecretKey. Will warn if we had to use an insecure random source.
1612          *
1613          * @return Status
1614          */
1615         public function generateKeys() {
1616                 $keys = array( 'wgSecretKey' => 64 );
1617                 if ( strval( $this->getVar( 'wgUpgradeKey' ) ) === '' ) {
1618                         $keys['wgUpgradeKey'] = 16;
1619                 }
1620
1621                 return $this->doGenerateKeys( $keys );
1622         }
1623
1624         /**
1625          * Generate a secret value for variables using our CryptRand generator.
1626          * Produce a warning if the random source was insecure.
1627          *
1628          * @param array $keys
1629          * @return Status
1630          */
1631         protected function doGenerateKeys( $keys ) {
1632                 $status = Status::newGood();
1633
1634                 $strong = true;
1635                 foreach ( $keys as $name => $length ) {
1636                         $secretKey = MWCryptRand::generateHex( $length, true );
1637                         if ( !MWCryptRand::wasStrong() ) {
1638                                 $strong = false;
1639                         }
1640
1641                         $this->setVar( $name, $secretKey );
1642                 }
1643
1644                 if ( !$strong ) {
1645                         $names = array_keys( $keys );
1646                         $names = preg_replace( '/^(.*)$/', '\$$1', $names );
1647                         global $wgLang;
1648                         $status->warning( 'config-insecure-keys', $wgLang->listToText( $names ), count( $names ) );
1649                 }
1650
1651                 return $status;
1652         }
1653
1654         /**
1655          * Create the first user account, grant it sysop and bureaucrat rights
1656          *
1657          * @return Status
1658          */
1659         protected function createSysop() {
1660                 $name = $this->getVar( '_AdminName' );
1661                 $user = User::newFromName( $name );
1662
1663                 if ( !$user ) {
1664                         // We should've validated this earlier anyway!
1665                         return Status::newFatal( 'config-admin-error-user', $name );
1666                 }
1667
1668                 if ( $user->idForName() == 0 ) {
1669                         $user->addToDatabase();
1670
1671                         try {
1672                                 $user->setPassword( $this->getVar( '_AdminPassword' ) );
1673                         } catch ( PasswordError $pwe ) {
1674                                 return Status::newFatal( 'config-admin-error-password', $name, $pwe->getMessage() );
1675                         }
1676
1677                         $user->addGroup( 'sysop' );
1678                         $user->addGroup( 'bureaucrat' );
1679                         if ( $this->getVar( '_AdminEmail' ) ) {
1680                                 $user->setEmail( $this->getVar( '_AdminEmail' ) );
1681                         }
1682                         $user->saveSettings();
1683
1684                         // Update user count
1685                         $ssUpdate = new SiteStatsUpdate( 0, 0, 0, 0, 1 );
1686                         $ssUpdate->doUpdate();
1687                 }
1688                 $status = Status::newGood();
1689
1690                 if ( $this->getVar( '_Subscribe' ) && $this->getVar( '_AdminEmail' ) ) {
1691                         $this->subscribeToMediaWikiAnnounce( $status );
1692                 }
1693
1694                 return $status;
1695         }
1696
1697         /**
1698          * @param Status $s
1699          */
1700         private function subscribeToMediaWikiAnnounce( Status $s ) {
1701                 $params = array(
1702                         'email' => $this->getVar( '_AdminEmail' ),
1703                         'language' => 'en',
1704                         'digest' => 0
1705                 );
1706
1707                 // Mailman doesn't support as many languages as we do, so check to make
1708                 // sure their selected language is available
1709                 $myLang = $this->getVar( '_UserLang' );
1710                 if ( in_array( $myLang, $this->mediaWikiAnnounceLanguages ) ) {
1711                         $myLang = $myLang == 'pt-br' ? 'pt_BR' : $myLang; // rewrite to Mailman's pt_BR
1712                         $params['language'] = $myLang;
1713                 }
1714
1715                 if ( MWHttpRequest::canMakeRequests() ) {
1716                         $res = MWHttpRequest::factory( $this->mediaWikiAnnounceUrl,
1717                                 array( 'method' => 'POST', 'postData' => $params ), __METHOD__ )->execute();
1718                         if ( !$res->isOK() ) {
1719                                 $s->warning( 'config-install-subscribe-fail', $res->getMessage() );
1720                         }
1721                 } else {
1722                         $s->warning( 'config-install-subscribe-notpossible' );
1723                 }
1724         }
1725
1726         /**
1727          * Insert Main Page with default content.
1728          *
1729          * @param DatabaseInstaller $installer
1730          * @return Status
1731          */
1732         protected function createMainpage( DatabaseInstaller $installer ) {
1733                 $status = Status::newGood();
1734                 try {
1735                         $page = WikiPage::factory( Title::newMainPage() );
1736                         $content = new WikitextContent(
1737                                 wfMessage( 'mainpagetext' )->inContentLanguage()->text() . "\n\n" .
1738                                 wfMessage( 'mainpagedocfooter' )->inContentLanguage()->text()
1739                         );
1740
1741                         $page->doEditContent( $content,
1742                                 '',
1743                                 EDIT_NEW,
1744                                 false,
1745                                 User::newFromName( 'MediaWiki default' )
1746                         );
1747                 } catch ( Exception $e ) {
1748                         // using raw, because $wgShowExceptionDetails can not be set yet
1749                         $status->fatal( 'config-install-mainpage-failed', $e->getMessage() );
1750                 }
1751
1752                 return $status;
1753         }
1754
1755         /**
1756          * Override the necessary bits of the config to run an installation.
1757          */
1758         public static function overrideConfig() {
1759                 define( 'MW_NO_SESSION', 1 );
1760
1761                 // Don't access the database
1762                 $GLOBALS['wgUseDatabaseMessages'] = false;
1763                 // Don't cache langconv tables
1764                 $GLOBALS['wgLanguageConverterCacheType'] = CACHE_NONE;
1765                 // Debug-friendly
1766                 $GLOBALS['wgShowExceptionDetails'] = true;
1767                 // Don't break forms
1768                 $GLOBALS['wgExternalLinkTarget'] = '_blank';
1769
1770                 // Extended debugging
1771                 $GLOBALS['wgShowSQLErrors'] = true;
1772                 $GLOBALS['wgShowDBErrorBacktrace'] = true;
1773
1774                 // Allow multiple ob_flush() calls
1775                 $GLOBALS['wgDisableOutputCompression'] = true;
1776
1777                 // Use a sensible cookie prefix (not my_wiki)
1778                 $GLOBALS['wgCookiePrefix'] = 'mw_installer';
1779
1780                 // Some of the environment checks make shell requests, remove limits
1781                 $GLOBALS['wgMaxShellMemory'] = 0;
1782         }
1783
1784         /**
1785          * Add an installation step following the given step.
1786          *
1787          * @param callable $callback A valid installation callback array, in this form:
1788          *    array( 'name' => 'some-unique-name', 'callback' => array( $obj, 'function' ) );
1789          * @param string $findStep The step to find. Omit to put the step at the beginning
1790          */
1791         public function addInstallStep( $callback, $findStep = 'BEGINNING' ) {
1792                 $this->extraInstallSteps[$findStep][] = $callback;
1793         }
1794
1795         /**
1796          * Disable the time limit for execution.
1797          * Some long-running pages (Install, Upgrade) will want to do this
1798          */
1799         protected function disableTimeLimit() {
1800                 MediaWiki\suppressWarnings();
1801                 set_time_limit( 0 );
1802                 MediaWiki\restoreWarnings();
1803         }
1804 }