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                 'wgDBtype',
 173                 'wgDiff3',
 174                 'wgImageMagickConvertCommand',
 175                 'wgGitBin',
 176                 'IP',
 177                 'wgScriptPath',
 178                 'wgMetaNamespace',
 179                 'wgDeletedDirectory',
 180                 'wgEnableUploads',
 181                 'wgShellLocale',
 182                 'wgSecretKey',
 183                 'wgUseInstantCommons',
 184                 'wgUpgradeKey',
 185                 'wgDefaultSkin',
 186         );
 187
 188         /**
 189          * Variables that are stored alongside globals, and are used for any
 190          * configuration of the installation process aside from the MediaWiki
 191          * configuration. Map of names to defaults.
 192          *
 193          * @var array
 194          */
 195         protected $internalDefaults = array(
 196                 '_UserLang' => 'en',
 197                 '_Environment' => false,
 198                 '_SafeMode' => false,
 199                 '_RaiseMemory' => false,
 200                 '_UpgradeDone' => false,
 201                 '_InstallDone' => false,
 202                 '_Caches' => array(),
 203                 '_InstallPassword' => '',
 204                 '_SameAccount' => true,
 205                 '_CreateDBAccount' => false,
 206                 '_NamespaceType' => 'site-name',
 207                 '_AdminName' => '', // will be set later, when the user selects language
 208                 '_AdminPassword' => '',
 209                 '_AdminPasswordConfirm' => '',
 210                 '_AdminEmail' => '',
 211                 '_Subscribe' => false,
 212                 '_SkipOptional' => 'continue',
 213                 '_RightsProfile' => 'wiki',
 214                 '_LicenseCode' => 'none',
 215                 '_CCDone' => false,
 216                 '_Extensions' => array(),
 217                 '_Skins' => array(),
 218                 '_MemCachedServers' => '',
 219                 '_UpgradeKeySupplied' => false,
 220                 '_ExistingDBSettings' => false,
 221
 222                 // $wgLogo is probably wrong (bug 48084); set something that will work.
 223                 // Single quotes work fine here, as LocalSettingsGenerator outputs this unescaped.
 224                 'wgLogo' => '$wgResourceBasePath/resources/assets/wiki.png',
 225         );
 226
 227         /**
 228          * The actual list of installation steps. This will be initialized by getInstallSteps()
 229          *
 230          * @var array
 231          */
 232         private $installSteps = array();
 233
 234         /**
 235          * Extra steps for installation, for things like DatabaseInstallers to modify
 236          *
 237          * @var array
 238          */
 239         protected $extraInstallSteps = array();
 240
 241         /**
 242          * Known object cache types and the functions used to test for their existence.
 243          *
 244          * @var array
 245          */
 246         protected $objectCaches = array(
 247                 'xcache' => 'xcache_get',
 248                 'apc' => 'apc_fetch',
 249                 'wincache' => 'wincache_ucache_get'
 250         );
 251
 252         /**
 253          * User rights profiles.
 254          *
 255          * @var array
 256          */
 257         public $rightsProfiles = array(
 258                 'wiki' => array(),
 259                 'no-anon' => array(
 260                         '*' => array( 'edit' => false )
 261                 ),
 262                 'fishbowl' => array(
 263                         '*' => array(
 264                                 'createaccount' => false,
 265                                 'edit' => false,
 266                         ),
 267                 ),
 268                 'private' => array(
 269                         '*' => array(
 270                                 'createaccount' => false,
 271                                 'edit' => false,
 272                                 'read' => false,
 273                         ),
 274                 ),
 275         );
 276
 277         /**
 278          * License types.
 279          *
 280          * @var array
 281          */
 282         public $licenses = array(
 283                 'cc-by' => array(
 284                         'url' => 'https://creativecommons.org/licenses/by/3.0/',
 285                         'icon' => '$wgResourceBasePath/resources/assets/licenses/cc-by.png',
 286                 ),
 287                 'cc-by-sa' => array(
 288                         'url' => 'https://creativecommons.org/licenses/by-sa/3.0/',
 289                         'icon' => '$wgResourceBasePath/resources/assets/licenses/cc-by-sa.png',
 290                 ),
 291                 'cc-by-nc-sa' => array(
 292                         'url' => 'https://creativecommons.org/licenses/by-nc-sa/3.0/',
 293                         'icon' => '$wgResourceBasePath/resources/assets/licenses/cc-by-nc-sa.png',
 294                 ),
 295                 'cc-0' => array(
 296                         'url' => 'https://creativecommons.org/publicdomain/zero/1.0/',
 297                         'icon' => '$wgResourceBasePath/resources/assets/licenses/cc-0.png',
 298                 ),
 299                 'pd' => array(
 300                         'url' => '',
 301                         'icon' => '$wgResourceBasePath/resources/assets/licenses/public-domain.png',
 302                 ),
 303                 'gfdl' => array(
 304                         'url' => 'https://www.gnu.org/copyleft/fdl.html',
 305                         'icon' => '$wgResourceBasePath/resources/assets/licenses/gnu-fdl.png',
 306                 ),
 307                 'none' => array(
 308                         'url' => '',
 309                         'icon' => '',
 310                         'text' => ''
 311                 ),
 312                 'cc-choose' => array(
 313                         // Details will be filled in by the selector.
 314                         'url' => '',
 315                         'icon' => '',
 316                         'text' => '',
 317                 ),
 318         );
 319
 320         /**
 321          * URL to mediawiki-announce subscription
 322          */
 323         protected $mediaWikiAnnounceUrl =
 324                 'https://lists.wikimedia.org/mailman/subscribe/mediawiki-announce';
 325
 326         /**
 327          * Supported language codes for Mailman
 328          */
 329         protected $mediaWikiAnnounceLanguages = array(
 330                 'ca', 'cs', 'da', 'de', 'en', 'es', 'et', 'eu', 'fi', 'fr', 'hr', 'hu',
 331                 'it', 'ja', 'ko', 'lt', 'nl', 'no', 'pl', 'pt', 'pt-br', 'ro', 'ru',
 332                 'sl', 'sr', 'sv', 'tr', 'uk'
 333         );
 334
 335         /**
 336          * UI interface for displaying a short message
 337          * The parameters are like parameters to wfMessage().
 338          * The messages will be in wikitext format, which will be converted to an
 339          * output format such as HTML or text before being sent to the user.
 340          * @param string $msg
 341          */
 342         abstract public function showMessage( $msg /*, ... */ );
 343
 344         /**
 345          * Same as showMessage(), but for displaying errors
 346          * @param string $msg
 347          */
 348         abstract public function showError( $msg /*, ... */ );
 349
 350         /**
 351          * Show a message to the installing user by using a Status object
 352          * @param Status $status
 353          */
 354         abstract public function showStatusMessage( Status $status );
 355
 356         /**
 357          * Constructor, always call this from child classes.
 358          */
 359         public function __construct() {
 360                 global $wgMessagesDirs, $wgUser;
 361
 362                 // Disable the i18n cache
 363                 Language::getLocalisationCache()->disableBackend();
 364                 // Disable LoadBalancer and wfGetDB etc.
 365                 LBFactory::disableBackend();
 366
 367                 // Disable object cache (otherwise CACHE_ANYTHING will try CACHE_DB and
 368                 // SqlBagOStuff will then throw since we just disabled wfGetDB)
 369                 $GLOBALS['wgMemc'] = new EmptyBagOStuff;
 370                 ObjectCache::clear();
 371                 $emptyCache = array( 'class' => 'EmptyBagOStuff' );
 372                 // disable (problematic) object cache types explicitly, preserving all other (working) ones
 373                 // bug T113843
 374                 $GLOBALS['wgObjectCaches'] = array(
 375                         CACHE_NONE => $emptyCache,
 376                         CACHE_DB => $emptyCache,
 377                         CACHE_ANYTHING => $emptyCache,
 378                         CACHE_MEMCACHED => $emptyCache,
 379                 ) + $GLOBALS['wgObjectCaches'];
 380
 381                 // Load the installer's i18n.
 382                 $wgMessagesDirs['MediawikiInstaller'] = __DIR__ . '/i18n';
 383
 384                 // Having a user with id = 0 safeguards us from DB access via User::loadOptions().
 385                 $wgUser = User::newFromId( 0 );
 386
 387                 $this->settings = $this->internalDefaults;
 388
 389                 foreach ( $this->defaultVarNames as $var ) {
 390                         $this->settings[$var] = $GLOBALS[$var];
 391                 }
 392
 393                 $this->doEnvironmentPreps();
 394
 395                 $this->compiledDBs = array();
 396                 foreach ( self::getDBTypes() as $type ) {
 397                         $installer = $this->getDBInstaller( $type );
 398
 399                         if ( !$installer->isCompiled() ) {
 400                                 continue;
 401                         }
 402                         $this->compiledDBs[] = $type;
 403                 }
 404
 405                 $this->parserTitle = Title::newFromText( 'Installer' );
 406                 $this->parserOptions = new ParserOptions; // language will be wrong :(
 407                 $this->parserOptions->setEditSection( false );
 408         }
 409
 410         /**
 411          * Get a list of known DB types.
 412          *
 413          * @return array
 414          */
 415         public static function getDBTypes() {
 416                 return self::$dbTypes;
 417         }
 418
 419         /**
 420          * Do initial checks of the PHP environment. Set variables according to
 421          * the observed environment.
 422          *
 423          * It's possible that this may be called under the CLI SAPI, not the SAPI
 424          * that the wiki will primarily run under. In that case, the subclass should
 425          * initialise variables such as wgScriptPath, before calling this function.
 426          *
 427          * Under the web subclass, it can already be assumed that PHP 5+ is in use
 428          * and that sessions are working.
 429          *
 430          * @return Status
 431          */
 432         public function doEnvironmentChecks() {
 433                 // Php version has already been checked by entry scripts
 434                 // Show message here for information purposes
 435                 if ( wfIsHHVM() ) {
 436                         $this->showMessage( 'config-env-hhvm', HHVM_VERSION );
 437                 } else {
 438                         $this->showMessage( 'config-env-php', PHP_VERSION );
 439                 }
 440
 441                 $good = true;
 442                 // Must go here because an old version of PCRE can prevent other checks from completing
 443                 list( $pcreVersion ) = explode( ' ', PCRE_VERSION, 2 );
 444                 if ( version_compare( $pcreVersion, self::MINIMUM_PCRE_VERSION, '<' ) ) {
 445                         $this->showError( 'config-pcre-old', self::MINIMUM_PCRE_VERSION, $pcreVersion );
 446                         $good = false;
 447                 } else {
 448                         foreach ( $this->envChecks as $check ) {
 449                                 $status = $this->$check();
 450                                 if ( $status === false ) {
 451                                         $good = false;
 452                                 }
 453                         }
 454                 }
 455
 456                 $this->setVar( '_Environment', $good );
 457
 458                 return $good ? Status::newGood() : Status::newFatal( 'config-env-bad' );
 459         }
 460
 461         public function doEnvironmentPreps() {
 462                 foreach ( $this->envPreps as $prep ) {
 463                         $this->$prep();
 464                 }
 465         }
 466
 467         /**
 468          * Set a MW configuration variable, or internal installer configuration variable.
 469          *
 470          * @param string $name
 471          * @param mixed $value
 472          */
 473         public function setVar( $name, $value ) {
 474                 $this->settings[$name] = $value;
 475         }
 476
 477         /**
 478          * Get an MW configuration variable, or internal installer configuration variable.
 479          * The defaults come from $GLOBALS (ultimately DefaultSettings.php).
 480          * Installer variables are typically prefixed by an underscore.
 481          *
 482          * @param string $name
 483          * @param mixed $default
 484          *
 485          * @return mixed
 486          */
 487         public function getVar( $name, $default = null ) {
 488                 if ( !isset( $this->settings[$name] ) ) {
 489                         return $default;
 490                 } else {
 491                         return $this->settings[$name];
 492                 }
 493         }
 494
 495         /**
 496          * Get a list of DBs supported by current PHP setup
 497          *
 498          * @return array
 499          */
 500         public function getCompiledDBs() {
 501                 return $this->compiledDBs;
 502         }
 503
 504         /**
 505          * Get an instance of DatabaseInstaller for the specified DB type.
 506          *
 507          * @param mixed $type DB installer for which is needed, false to use default.
 508          *
 509          * @return DatabaseInstaller
 510          */
 511         public function getDBInstaller( $type = false ) {
 512                 if ( !$type ) {
 513                         $type = $this->getVar( 'wgDBtype' );
 514                 }
 515
 516                 $type = strtolower( $type );
 517
 518                 if ( !isset( $this->dbInstallers[$type] ) ) {
 519                         $class = ucfirst( $type ) . 'Installer';
 520                         $this->dbInstallers[$type] = new $class( $this );
 521                 }
 522
 523                 return $this->dbInstallers[$type];
 524         }
 525
 526         /**
 527          * Determine if LocalSettings.php exists. If it does, return its variables.
 528          *
 529          * @return array
 530          */
 531         public static function getExistingLocalSettings() {
 532                 global $IP;
 533
 534                 // You might be wondering why this is here. Well if you don't do this
 535                 // then some poorly-formed extensions try to call their own classes
 536                 // after immediately registering them. We really need to get extension
 537                 // registration out of the global scope and into a real format.
 538                 // @see https://phabricator.wikimedia.org/T69440
 539                 global $wgAutoloadClasses;
 540                 $wgAutoloadClasses = array();
 541
 542                 // @codingStandardsIgnoreStart
 543                 // LocalSettings.php should not call functions, except wfLoadSkin/wfLoadExtensions
 544                 // Define the required globals here, to ensure, the functions can do it work correctly.
 545                 global $wgExtensionDirectory, $wgStyleDirectory;
 546                 // @codingStandardsIgnoreEnd
 547
 548                 MediaWiki\suppressWarnings();
 549                 $_lsExists = file_exists( "$IP/LocalSettings.php" );
 550                 MediaWiki\restoreWarnings();
 551
 552                 if ( !$_lsExists ) {
 553                         return false;
 554                 }
 555                 unset( $_lsExists );
 556
 557                 require "$IP/includes/DefaultSettings.php";
 558                 require "$IP/LocalSettings.php";
 559
 560                 return get_defined_vars();
 561         }
 562
 563         /**
 564          * Get a fake password for sending back to the user in HTML.
 565          * This is a security mechanism to avoid compromise of the password in the
 566          * event of session ID compromise.
 567          *
 568          * @param string $realPassword
 569          *
 570          * @return string
 571          */
 572         public function getFakePassword( $realPassword ) {
 573                 return str_repeat( '*', strlen( $realPassword ) );
 574         }
 575
 576         /**
 577          * Set a variable which stores a password, except if the new value is a
 578          * fake password in which case leave it as it is.
 579          *
 580          * @param string $name
 581          * @param mixed $value
 582          */
 583         public function setPassword( $name, $value ) {
 584                 if ( !preg_match( '/^\*+$/', $value ) ) {
 585                         $this->setVar( $name, $value );
 586                 }
 587         }
 588
 589         /**
 590          * On POSIX systems return the primary group of the webserver we're running under.
 591          * On other systems just returns null.
 592          *
 593          * This is used to advice the user that he should chgrp his mw-config/data/images directory as the
 594          * webserver user before he can install.
 595          *
 596          * Public because SqliteInstaller needs it, and doesn't subclass Installer.
 597          *
 598          * @return mixed
 599          */
 600         public static function maybeGetWebserverPrimaryGroup() {
 601                 if ( !function_exists( 'posix_getegid' ) || !function_exists( 'posix_getpwuid' ) ) {
 602                         # I don't know this, this isn't UNIX.
 603                         return null;
 604                 }
 605
 606                 # posix_getegid() *not* getmygid() because we want the group of the webserver,
 607                 # not whoever owns the current script.
 608                 $gid = posix_getegid();
 609                 $getpwuid = posix_getpwuid( $gid );
 610                 $group = $getpwuid['name'];
 611
 612                 return $group;
 613         }
 614
 615         /**
 616          * Convert wikitext $text to HTML.
 617          *
 618          * This is potentially error prone since many parser features require a complete
 619          * installed MW database. The solution is to just not use those features when you
 620          * write your messages. This appears to work well enough. Basic formatting and
 621          * external links work just fine.
 622          *
 623          * But in case a translator decides to throw in a "#ifexist" or internal link or
 624          * whatever, this function is guarded to catch the attempted DB access and to present
 625          * some fallback text.
 626          *
 627          * @param string $text
 628          * @param bool $lineStart
 629          * @return string
 630          */
 631         public function parse( $text, $lineStart = false ) {
 632                 global $wgParser;
 633
 634                 try {
 635                         $out = $wgParser->parse( $text, $this->parserTitle, $this->parserOptions, $lineStart );
 636                         $html = $out->getText();
 637                 } catch ( DBAccessError $e ) {
 638                         $html = '<!--DB access attempted during parse-->  ' . htmlspecialchars( $text );
 639
 640                         if ( !empty( $this->debug ) ) {
 641                                 $html .= "<!--\n" . $e->getTraceAsString() . "\n-->";
 642                         }
 643                 }
 644
 645                 return $html;
 646         }
 647
 648         /**
 649          * @return ParserOptions
 650          */
 651         public function getParserOptions() {
 652                 return $this->parserOptions;
 653         }
 654
 655         public function disableLinkPopups() {
 656                 $this->parserOptions->setExternalLinkTarget( false );
 657         }
 658
 659         public function restoreLinkPopups() {
 660                 global $wgExternalLinkTarget;
 661                 $this->parserOptions->setExternalLinkTarget( $wgExternalLinkTarget );
 662         }
 663
 664         /**
 665          * Install step which adds a row to the site_stats table with appropriate
 666          * initial values.
 667          *
 668          * @param DatabaseInstaller $installer
 669          *
 670          * @return Status
 671          */
 672         public function populateSiteStats( DatabaseInstaller $installer ) {
 673                 $status = $installer->getConnection();
 674                 if ( !$status->isOK() ) {
 675                         return $status;
 676                 }
 677                 $status->value->insert(
 678                         'site_stats',
 679                         array(
 680                                 'ss_row_id' => 1,
 681                                 'ss_total_edits' => 0,
 682                                 'ss_good_articles' => 0,
 683                                 'ss_total_pages' => 0,
 684                                 'ss_users' => 0,
 685                                 'ss_images' => 0
 686                         ),
 687                         __METHOD__, 'IGNORE'
 688                 );
 689
 690                 return Status::newGood();
 691         }
 692
 693         /**
 694          * Exports all wg* variables stored by the installer into global scope.
 695          */
 696         public function exportVars() {
 697                 foreach ( $this->settings as $name => $value ) {
 698                         if ( substr( $name, 0, 2 ) == 'wg' ) {
 699                                 $GLOBALS[$name] = $value;
 700                         }
 701                 }
 702         }
 703
 704         /**
 705          * Environment check for DB types.
 706          * @return bool
 707          */
 708         protected function envCheckDB() {
 709                 global $wgLang;
 710
 711                 $allNames = array();
 712
 713                 // Messages: config-type-mysql, config-type-postgres, config-type-oracle,
 714                 // config-type-sqlite
 715                 foreach ( self::getDBTypes() as $name ) {
 716                         $allNames[] = wfMessage( "config-type-$name" )->text();
 717                 }
 718
 719                 $databases = $this->getCompiledDBs();
 720
 721                 $databases = array_flip( $databases );
 722                 foreach ( array_keys( $databases ) as $db ) {
 723                         $installer = $this->getDBInstaller( $db );
 724                         $status = $installer->checkPrerequisites();
 725                         if ( !$status->isGood() ) {
 726                                 $this->showStatusMessage( $status );
 727                         }
 728                         if ( !$status->isOK() ) {
 729                                 unset( $databases[$db] );
 730                         }
 731                 }
 732                 $databases = array_flip( $databases );
 733                 if ( !$databases ) {
 734                         $this->showError( 'config-no-db', $wgLang->commaList( $allNames ), count( $allNames ) );
 735
 736                         // @todo FIXME: This only works for the web installer!
 737                         return false;
 738                 }
 739
 740                 return true;
 741         }
 742
 743         /**
 744          * Environment check for register_globals.
 745          * Prevent installation if enabled
 746          * @return bool
 747          */
 748         protected function envCheckRegisterGlobals() {
 749                 if ( wfIniGetBool( 'register_globals' ) ) {
 750                         $this->showMessage( 'config-register-globals-error' );
 751                         return false;
 752                 }
 753
 754                 return true;
 755         }
 756
 757         /**
 758          * Some versions of libxml+PHP break < and > encoding horribly
 759          * @return bool
 760          */
 761         protected function envCheckBrokenXML() {
 762                 $test = new PhpXmlBugTester();
 763                 if ( !$test->ok ) {
 764                         $this->showError( 'config-brokenlibxml' );
 765
 766                         return false;
 767                 }
 768
 769                 return true;
 770         }
 771
 772         /**
 773          * Environment check for magic_quotes_(gpc|runtime|sybase).
 774          * @return bool
 775          */
 776         protected function envCheckMagicQuotes() {
 777                 $status = true;
 778                 foreach ( array( 'gpc', 'runtime', 'sybase' ) as $magicJunk ) {
 779                         if ( wfIniGetBool( "magic_quotes_$magicJunk" ) ) {
 780                                 $this->showError( "config-magic-quotes-$magicJunk" );
 781                                 $status = false;
 782                         }
 783                 }
 784
 785                 return $status;
 786         }
 787
 788         /**
 789          * Environment check for mbstring.func_overload.
 790          * @return bool
 791          */
 792         protected function envCheckMbstring() {
 793                 if ( wfIniGetBool( 'mbstring.func_overload' ) ) {
 794                         $this->showError( 'config-mbstring' );
 795
 796                         return false;
 797                 }
 798
 799                 return true;
 800         }
 801
 802         /**
 803          * Environment check for safe_mode.
 804          * @return bool
 805          */
 806         protected function envCheckSafeMode() {
 807                 if ( wfIniGetBool( 'safe_mode' ) ) {
 808                         $this->setVar( '_SafeMode', true );
 809                         $this->showMessage( 'config-safe-mode' );
 810                 }
 811
 812                 return true;
 813         }
 814
 815         /**
 816          * Environment check for the XML module.
 817          * @return bool
 818          */
 819         protected function envCheckXML() {
 820                 if ( !function_exists( "utf8_encode" ) ) {
 821                         $this->showError( 'config-xml-bad' );
 822
 823                         return false;
 824                 }
 825
 826                 return true;
 827         }
 828
 829         /**
 830          * Environment check for the PCRE module.
 831          *
 832          * @note If this check were to fail, the parser would
 833          *   probably throw an exception before the result
 834          *   of this check is shown to the user.
 835          * @return bool
 836          */
 837         protected function envCheckPCRE() {
 838                 MediaWiki\suppressWarnings();
 839                 $regexd = preg_replace( '/[\x{0430}-\x{04FF}]/iu', '', '-АБВГД-' );
 840                 // Need to check for \p support too, as PCRE can be compiled
 841                 // with utf8 support, but not unicode property support.
 842                 // check that \p{Zs} (space separators) matches
 843                 // U+3000 (Ideographic space)
 844                 $regexprop = preg_replace( '/\p{Zs}/u', '', "-\xE3\x80\x80-" );
 845                 MediaWiki\restoreWarnings();
 846                 if ( $regexd != '--' || $regexprop != '--' ) {
 847                         $this->showError( 'config-pcre-no-utf8' );
 848
 849                         return false;
 850                 }
 851
 852                 return true;
 853         }
 854
 855         /**
 856          * Environment check for available memory.
 857          * @return bool
 858          */
 859         protected function envCheckMemory() {
 860                 $limit = ini_get( 'memory_limit' );
 861
 862                 if ( !$limit || $limit == -1 ) {
 863                         return true;
 864                 }
 865
 866                 $n = wfShorthandToInteger( $limit );
 867
 868                 if ( $n < $this->minMemorySize * 1024 * 1024 ) {
 869                         $newLimit = "{$this->minMemorySize}M";
 870
 871                         if ( ini_set( "memory_limit", $newLimit ) === false ) {
 872                                 $this->showMessage( 'config-memory-bad', $limit );
 873                         } else {
 874                                 $this->showMessage( 'config-memory-raised', $limit, $newLimit );
 875                                 $this->setVar( '_RaiseMemory', true );
 876                         }
 877                 }
 878
 879                 return true;
 880         }
 881
 882         /**
 883          * Environment check for compiled object cache types.
 884          */
 885         protected function envCheckCache() {
 886                 $caches = array();
 887                 foreach ( $this->objectCaches as $name => $function ) {
 888                         if ( function_exists( $function ) ) {
 889                                 if ( $name == 'xcache' && !wfIniGetBool( 'xcache.var_size' ) ) {
 890                                         continue;
 891                                 }
 892                                 $caches[$name] = true;
 893                         }
 894                 }
 895
 896                 if ( !$caches ) {
 897                         $this->showMessage( 'config-no-cache' );
 898                 }
 899
 900                 $this->setVar( '_Caches', $caches );
 901         }
 902
 903         /**
 904          * Scare user to death if they have mod_security or mod_security2
 905          * @return bool
 906          */
 907         protected function envCheckModSecurity() {
 908                 if ( self::apacheModulePresent( 'mod_security' )
 909                         || self::apacheModulePresent( 'mod_security2' ) ) {
 910                         $this->showMessage( 'config-mod-security' );
 911                 }
 912
 913                 return true;
 914         }
 915
 916         /**
 917          * Search for GNU diff3.
 918          * @return bool
 919          */
 920         protected function envCheckDiff3() {
 921                 $names = array( "gdiff3", "diff3", "diff3.exe" );
 922                 $versionInfo = array( '$1 --version 2>&1', 'GNU diffutils' );
 923
 924                 $diff3 = self::locateExecutableInDefaultPaths( $names, $versionInfo );
 925
 926                 if ( $diff3 ) {
 927                         $this->setVar( 'wgDiff3', $diff3 );
 928                 } else {
 929                         $this->setVar( 'wgDiff3', false );
 930                         $this->showMessage( 'config-diff3-bad' );
 931                 }
 932
 933                 return true;
 934         }
 935
 936         /**
 937          * Environment check for ImageMagick and GD.
 938          * @return bool
 939          */
 940         protected function envCheckGraphics() {
 941                 $names = array( wfIsWindows() ? 'convert.exe' : 'convert' );
 942                 $versionInfo = array( '$1 -version', 'ImageMagick' );
 943                 $convert = self::locateExecutableInDefaultPaths( $names, $versionInfo );
 944
 945                 $this->setVar( 'wgImageMagickConvertCommand', '' );
 946                 if ( $convert ) {
 947                         $this->setVar( 'wgImageMagickConvertCommand', $convert );
 948                         $this->showMessage( 'config-imagemagick', $convert );
 949
 950                         return true;
 951                 } elseif ( function_exists( 'imagejpeg' ) ) {
 952                         $this->showMessage( 'config-gd' );
 953                 } else {
 954                         $this->showMessage( 'config-no-scaling' );
 955                 }
 956
 957                 return true;
 958         }
 959
 960         /**
 961          * Search for git.
 962          *
 963          * @since 1.22
 964          * @return bool
 965          */
 966         protected function envCheckGit() {
 967                 $names = array( wfIsWindows() ? 'git.exe' : 'git' );
 968                 $versionInfo = array( '$1 --version', 'git version' );
 969
 970                 $git = self::locateExecutableInDefaultPaths( $names, $versionInfo );
 971
 972                 if ( $git ) {
 973                         $this->setVar( 'wgGitBin', $git );
 974                         $this->showMessage( 'config-git', $git );
 975                 } else {
 976                         $this->setVar( 'wgGitBin', false );
 977                         $this->showMessage( 'config-git-bad' );
 978                 }
 979
 980                 return true;
 981         }
 982
 983         /**
 984          * Environment check to inform user which server we've assumed.
 985          *
 986          * @return bool
 987          */
 988         protected function envCheckServer() {
 989                 $server = $this->envGetDefaultServer();
 990                 if ( $server !== null ) {
 991                         $this->showMessage( 'config-using-server', $server );
 992                 }
 993                 return true;
 994         }
 995
 996         /**
 997          * Environment check to inform user which paths we've assumed.
 998          *
 999          * @return bool
1000          */
1001         protected function envCheckPath() {
1002                 $this->showMessage(
1003                         'config-using-uri',
1004                         $this->getVar( 'wgServer' ),
1005                         $this->getVar( 'wgScriptPath' )
1006                 );
1007                 return true;
1008         }
1009
1010         /**
1011          * Environment check for preferred locale in shell
1012          * @return bool
1013          */
1014         protected function envCheckShellLocale() {
1015                 $os = php_uname( 's' );
1016                 $supported = array( 'Linux', 'SunOS', 'HP-UX', 'Darwin' ); # Tested these
1017
1018                 if ( !in_array( $os, $supported ) ) {
1019                         return true;
1020                 }
1021
1022                 # Get a list of available locales.
1023                 $ret = false;
1024                 $lines = wfShellExec( '/usr/bin/locale -a', $ret );
1025
1026                 if ( $ret ) {
1027                         return true;
1028                 }
1029
1030                 $lines = array_map( 'trim', explode( "\n", $lines ) );
1031                 $candidatesByLocale = array();
1032                 $candidatesByLang = array();
1033
1034                 foreach ( $lines as $line ) {
1035                         if ( $line === '' ) {
1036                                 continue;
1037                         }
1038
1039                         if ( !preg_match( '/^([a-zA-Z]+)(_[a-zA-Z]+|)\.(utf8|UTF-8)(@[a-zA-Z_]*|)$/i', $line, $m ) ) {
1040                                 continue;
1041                         }
1042
1043                         list( , $lang, , , ) = $m;
1044
1045                         $candidatesByLocale[$m[0]] = $m;
1046                         $candidatesByLang[$lang][] = $m;
1047                 }
1048
1049                 # Try the current value of LANG.
1050                 if ( isset( $candidatesByLocale[getenv( 'LANG' )] ) ) {
1051                         $this->setVar( 'wgShellLocale', getenv( 'LANG' ) );
1052
1053                         return true;
1054                 }
1055
1056                 # Try the most common ones.
1057                 $commonLocales = array( 'en_US.UTF-8', 'en_US.utf8', 'de_DE.UTF-8', 'de_DE.utf8' );
1058                 foreach ( $commonLocales as $commonLocale ) {
1059                         if ( isset( $candidatesByLocale[$commonLocale] ) ) {
1060                                 $this->setVar( 'wgShellLocale', $commonLocale );
1061
1062                                 return true;
1063                         }
1064                 }
1065
1066                 # Is there an available locale in the Wiki's language?
1067                 $wikiLang = $this->getVar( 'wgLanguageCode' );
1068
1069                 if ( isset( $candidatesByLang[$wikiLang] ) ) {
1070                         $m = reset( $candidatesByLang[$wikiLang] );
1071                         $this->setVar( 'wgShellLocale', $m[0] );
1072
1073                         return true;
1074                 }
1075
1076                 # Are there any at all?
1077                 if ( count( $candidatesByLocale ) ) {
1078                         $m = reset( $candidatesByLocale );
1079                         $this->setVar( 'wgShellLocale', $m[0] );
1080
1081                         return true;
1082                 }
1083
1084                 # Give up.
1085                 return true;
1086         }
1087
1088         /**
1089          * Environment check for the permissions of the uploads directory
1090          * @return bool
1091          */
1092         protected function envCheckUploadsDirectory() {
1093                 global $IP;
1094
1095                 $dir = $IP . '/images/';
1096                 $url = $this->getVar( 'wgServer' ) . $this->getVar( 'wgScriptPath' ) . '/images/';
1097                 $safe = !$this->dirIsExecutable( $dir, $url );
1098
1099                 if ( !$safe ) {
1100                         $this->showMessage( 'config-uploads-not-safe', $dir );
1101                 }
1102
1103                 return true;
1104         }
1105
1106         /**
1107          * Checks if suhosin.get.max_value_length is set, and if so generate
1108          * a warning because it decreases ResourceLoader performance.
1109          * @return bool
1110          */
1111         protected function envCheckSuhosinMaxValueLength() {
1112                 $maxValueLength = ini_get( 'suhosin.get.max_value_length' );
1113                 if ( $maxValueLength > 0 && $maxValueLength < 1024 ) {
1114                         // Only warn if the value is below the sane 1024
1115                         $this->showMessage( 'config-suhosin-max-value-length', $maxValueLength );
1116                 }
1117
1118                 return true;
1119         }
1120
1121         /**
1122          * Convert a hex string representing a Unicode code point to that code point.
1123          * @param string $c
1124          * @return string
1125          */
1126         protected function unicodeChar( $c ) {
1127                 $c = hexdec( $c );
1128                 if ( $c <= 0x7F ) {
1129                         return chr( $c );
1130                 } elseif ( $c <= 0x7FF ) {
1131                         return chr( 0xC0 | $c >> 6 ) . chr( 0x80 | $c & 0x3F );
1132                 } elseif ( $c <= 0xFFFF ) {
1133                         return chr( 0xE0 | $c >> 12 ) . chr( 0x80 | $c >> 6 & 0x3F ) .
1134                                 chr( 0x80 | $c & 0x3F );
1135                 } elseif ( $c <= 0x10FFFF ) {
1136                         return chr( 0xF0 | $c >> 18 ) . chr( 0x80 | $c >> 12 & 0x3F ) .
1137                                 chr( 0x80 | $c >> 6 & 0x3F ) .
1138                                 chr( 0x80 | $c & 0x3F );
1139                 } else {
1140                         return false;
1141                 }
1142         }
1143
1144         /**
1145          * Check the libicu version
1146          */
1147         protected function envCheckLibicu() {
1148                 /**
1149                  * This needs to be updated something that the latest libicu
1150                  * will properly normalize.  This normalization was found at
1151                  * http://www.unicode.org/versions/Unicode5.2.0/#Character_Additions
1152                  * Note that we use the hex representation to create the code
1153                  * points in order to avoid any Unicode-destroying during transit.
1154                  */
1155                 $not_normal_c = $this->unicodeChar( "FA6C" );
1156                 $normal_c = $this->unicodeChar( "242EE" );
1157
1158                 $useNormalizer = 'php';
1159                 $needsUpdate = false;
1160
1161                 if ( function_exists( 'normalizer_normalize' ) ) {
1162                         $useNormalizer = 'intl';
1163                         $intl = normalizer_normalize( $not_normal_c, Normalizer::FORM_C );
1164                         if ( $intl !== $normal_c ) {
1165                                 $needsUpdate = true;
1166                         }
1167                 }
1168
1169                 // Uses messages 'config-unicode-using-php' and 'config-unicode-using-intl'
1170                 if ( $useNormalizer === 'php' ) {
1171                         $this->showMessage( 'config-unicode-pure-php-warning' );
1172                 } else {
1173                         $this->showMessage( 'config-unicode-using-' . $useNormalizer );
1174                         if ( $needsUpdate ) {
1175                                 $this->showMessage( 'config-unicode-update-warning' );
1176                         }
1177                 }
1178         }
1179
1180         /**
1181          * @return bool
1182          */
1183         protected function envCheckCtype() {
1184                 if ( !function_exists( 'ctype_digit' ) ) {
1185                         $this->showError( 'config-ctype' );
1186
1187                         return false;
1188                 }
1189
1190                 return true;
1191         }
1192
1193         /**
1194          * @return bool
1195          */
1196         protected function envCheckIconv() {
1197                 if ( !function_exists( 'iconv' ) ) {
1198                         $this->showError( 'config-iconv' );
1199
1200                         return false;
1201                 }
1202
1203                 return true;
1204         }
1205
1206         /**
1207          * @return bool
1208          */
1209         protected function envCheckJSON() {
1210                 if ( !function_exists( 'json_decode' ) ) {
1211                         $this->showError( 'config-json' );
1212
1213                         return false;
1214                 }
1215
1216                 return true;
1217         }
1218
1219         /**
1220          * Environment prep for the server hostname.
1221          */
1222         protected function envPrepServer() {
1223                 $server = $this->envGetDefaultServer();
1224                 if ( $server !== null ) {
1225                         $this->setVar( 'wgServer', $server );
1226                 }
1227         }
1228
1229         /**
1230          * Helper function to be called from envPrepServer()
1231          * @return string
1232          */
1233         abstract protected function envGetDefaultServer();
1234
1235         /**
1236          * Environment prep for setting $IP and $wgScriptPath.
1237          */
1238         protected function envPrepPath() {
1239                 global $IP;
1240                 $IP = dirname( dirname( __DIR__ ) );
1241                 $this->setVar( 'IP', $IP );
1242         }
1243
1244         /**
1245          * Get an array of likely places we can find executables. Check a bunch
1246          * of known Unix-like defaults, as well as the PATH environment variable
1247          * (which should maybe make it work for Windows?)
1248          *
1249          * @return array
1250          */
1251         protected static function getPossibleBinPaths() {
1252                 return array_merge(
1253                         array( '/usr/bin', '/usr/local/bin', '/opt/csw/bin',
1254                                 '/usr/gnu/bin', '/usr/sfw/bin', '/sw/bin', '/opt/local/bin' ),
1255                         explode( PATH_SEPARATOR, getenv( 'PATH' ) )
1256                 );
1257         }
1258
1259         /**
1260          * Search a path for any of the given executable names. Returns the
1261          * executable name if found. Also checks the version string returned
1262          * by each executable.
1263          *
1264          * Used only by environment checks.
1265          *
1266          * @param string $path Path to search
1267          * @param array $names Array of executable names
1268          * @param array|bool $versionInfo False or array with two members:
1269          *   0 => Command to run for version check, with $1 for the full executable name
1270          *   1 => String to compare the output with
1271          *
1272          * If $versionInfo is not false, only executables with a version
1273          * matching $versionInfo[1] will be returned.
1274          * @return bool|string
1275          */
1276         public static function locateExecutable( $path, $names, $versionInfo = false ) {
1277                 if ( !is_array( $names ) ) {
1278                         $names = array( $names );
1279                 }
1280
1281                 foreach ( $names as $name ) {
1282                         $command = $path . DIRECTORY_SEPARATOR . $name;
1283
1284                         MediaWiki\suppressWarnings();
1285                         $file_exists = file_exists( $command );
1286                         MediaWiki\restoreWarnings();
1287
1288                         if ( $file_exists ) {
1289                                 if ( !$versionInfo ) {
1290                                         return $command;
1291                                 }
1292
1293                                 $file = str_replace( '$1', wfEscapeShellArg( $command ), $versionInfo[0] );
1294                                 if ( strstr( wfShellExec( $file ), $versionInfo[1] ) !== false ) {
1295                                         return $command;
1296                                 }
1297                         }
1298                 }
1299
1300                 return false;
1301         }
1302
1303         /**
1304          * Same as locateExecutable(), but checks in getPossibleBinPaths() by default
1305          * @see locateExecutable()
1306          * @param array $names Array of possible names.
1307          * @param array|bool $versionInfo Default: false or array with two members:
1308          *   0 => Command to run for version check, with $1 for the full executable name
1309          *   1 => String to compare the output with
1310          *
1311          * If $versionInfo is not false, only executables with a version
1312          * matching $versionInfo[1] will be returned.
1313          * @return bool|string
1314          */
1315         public static function locateExecutableInDefaultPaths( $names, $versionInfo = false ) {
1316                 foreach ( self::getPossibleBinPaths() as $path ) {
1317                         $exe = self::locateExecutable( $path, $names, $versionInfo );
1318                         if ( $exe !== false ) {
1319                                 return $exe;
1320                         }
1321                 }
1322
1323                 return false;
1324         }
1325
1326         /**
1327          * Checks if scripts located in the given directory can be executed via the given URL.
1328          *
1329          * Used only by environment checks.
1330          * @param string $dir
1331          * @param string $url
1332          * @return bool|int|string
1333          */
1334         public function dirIsExecutable( $dir, $url ) {
1335                 $scriptTypes = array(
1336                         'php' => array(
1337                                 "<?php echo 'ex' . 'ec';",
1338                                 "#!/var/env php5\n<?php echo 'ex' . 'ec';",
1339                         ),
1340                 );
1341
1342                 // it would be good to check other popular languages here, but it'll be slow.
1343
1344                 MediaWiki\suppressWarnings();
1345
1346                 foreach ( $scriptTypes as $ext => $contents ) {
1347                         foreach ( $contents as $source ) {
1348                                 $file = 'exectest.' . $ext;
1349
1350                                 if ( !file_put_contents( $dir . $file, $source ) ) {
1351                                         break;
1352                                 }
1353
1354                                 try {
1355                                         $text = Http::get( $url . $file, array( 'timeout' => 3 ), __METHOD__ );
1356                                 } catch ( Exception $e ) {
1357                                         // Http::get throws with allow_url_fopen = false and no curl extension.
1358                                         $text = null;
1359                                 }
1360                                 unlink( $dir . $file );
1361
1362                                 if ( $text == 'exec' ) {
1363                                         MediaWiki\restoreWarnings();
1364
1365                                         return $ext;
1366                                 }
1367                         }
1368                 }
1369
1370                 MediaWiki\restoreWarnings();
1371
1372                 return false;
1373         }
1374
1375         /**
1376          * Checks for presence of an Apache module. Works only if PHP is running as an Apache module, too.
1377          *
1378          * @param string $moduleName Name of module to check.
1379          * @return bool
1380          */
1381         public static function apacheModulePresent( $moduleName ) {
1382                 if ( function_exists( 'apache_get_modules' ) && in_array( $moduleName, apache_get_modules() ) ) {
1383                         return true;
1384                 }
1385                 // try it the hard way
1386                 ob_start();
1387                 phpinfo( INFO_MODULES );
1388                 $info = ob_get_clean();
1389
1390                 return strpos( $info, $moduleName ) !== false;
1391         }
1392
1393         /**
1394          * ParserOptions are constructed before we determined the language, so fix it
1395          *
1396          * @param Language $lang
1397          */
1398         public function setParserLanguage( $lang ) {
1399                 $this->parserOptions->setTargetLanguage( $lang );
1400                 $this->parserOptions->setUserLang( $lang );
1401         }
1402
1403         /**
1404          * Overridden by WebInstaller to provide lastPage parameters.
1405          * @param string $page
1406          * @return string
1407          */
1408         protected function getDocUrl( $page ) {
1409                 return "{$_SERVER['PHP_SELF']}?page=" . urlencode( $page );
1410         }
1411
1412         /**
1413          * Finds extensions that follow the format /$directory/Name/Name.php,
1414          * and returns an array containing the value for 'Name' for each found extension.
1415          *
1416          * Reasonable values for $directory include 'extensions' (the default) and 'skins'.
1417          *
1418          * @param string $directory Directory to search in
1419          * @return array
1420          */
1421         public function findExtensions( $directory = 'extensions' ) {
1422                 if ( $this->getVar( 'IP' ) === null ) {
1423                         return array();
1424                 }
1425
1426                 $extDir = $this->getVar( 'IP' ) . '/' . $directory;
1427                 if ( !is_readable( $extDir ) || !is_dir( $extDir ) ) {
1428                         return array();
1429                 }
1430
1431                 // extensions -> extension.json, skins -> skin.json
1432                 $jsonFile = substr( $directory, 0, strlen( $directory ) -1 ) . '.json';
1433
1434                 $dh = opendir( $extDir );
1435                 $exts = array();
1436                 while ( ( $file = readdir( $dh ) ) !== false ) {
1437                         if ( !is_dir( "$extDir/$file" ) ) {
1438                                 continue;
1439                         }
1440                         if ( file_exists( "$extDir/$file/$jsonFile" ) || file_exists( "$extDir/$file/$file.php" ) ) {
1441                                 $exts[] = $file;
1442                         }
1443                 }
1444                 closedir( $dh );
1445                 natcasesort( $exts );
1446
1447                 return $exts;
1448         }
1449
1450         /**
1451          * Returns a default value to be used for $wgDefaultSkin: normally the one set in DefaultSettings,
1452          * but will fall back to another if the default skin is missing and some other one is present
1453          * instead.
1454          *
1455          * @param string[] $skinNames Names of installed skins.
1456          * @return string
1457          */
1458         public function getDefaultSkin( array $skinNames ) {
1459                 $defaultSkin = $GLOBALS['wgDefaultSkin'];
1460                 if ( !$skinNames || in_array( $defaultSkin, $skinNames ) ) {
1461                         return $defaultSkin;
1462                 } else {
1463                         return $skinNames[0];
1464                 }
1465         }
1466
1467         /**
1468          * Installs the auto-detected extensions.
1469          *
1470          * @return Status
1471          */
1472         protected function includeExtensions() {
1473                 global $IP;
1474                 $exts = $this->getVar( '_Extensions' );
1475                 $IP = $this->getVar( 'IP' );
1476
1477                 /**
1478                  * We need to include DefaultSettings before including extensions to avoid
1479                  * warnings about unset variables. However, the only thing we really
1480                  * want here is $wgHooks['LoadExtensionSchemaUpdates']. This won't work
1481                  * if the extension has hidden hook registration in $wgExtensionFunctions,
1482                  * but we're not opening that can of worms
1483                  * @see https://phabricator.wikimedia.org/T28857
1484                  */
1485                 global $wgAutoloadClasses;
1486                 $wgAutoloadClasses = array();
1487                 $queue = array();
1488
1489                 require "$IP/includes/DefaultSettings.php";
1490
1491                 foreach ( $exts as $e ) {
1492                         if ( file_exists( "$IP/extensions/$e/extension.json" ) ) {
1493                                 $queue["$IP/extensions/$e/extension.json"] = 1;
1494                         } else {
1495                                 require_once "$IP/extensions/$e/$e.php";
1496                         }
1497                 }
1498
1499                 $registry = new ExtensionRegistry();
1500                 $data = $registry->readFromQueue( $queue );
1501                 $wgAutoloadClasses += $data['autoload'];
1502
1503                 $hooksWeWant = isset( $wgHooks['LoadExtensionSchemaUpdates'] ) ?
1504                         $wgHooks['LoadExtensionSchemaUpdates'] : array();
1505
1506                 if ( isset( $data['globals']['wgHooks']['LoadExtensionSchemaUpdates'] ) ) {
1507                         $hooksWeWant = array_merge_recursive(
1508                                 $hooksWeWant,
1509                                 $data['globals']['wgHooks']['LoadExtensionSchemaUpdates']
1510                         );
1511                 }
1512                 // Unset everyone else's hooks. Lord knows what someone might be doing
1513                 // in ParserFirstCallInit (see bug 27171)
1514                 $GLOBALS['wgHooks'] = array( 'LoadExtensionSchemaUpdates' => $hooksWeWant );
1515
1516                 return Status::newGood();
1517         }
1518
1519         /**
1520          * Get an array of install steps. Should always be in the format of
1521          * array(
1522          *   'name'     => 'someuniquename',
1523          *   'callback' => array( $obj, 'method' ),
1524          * )
1525          * There must be a config-install-$name message defined per step, which will
1526          * be shown on install.
1527          *
1528          * @param DatabaseInstaller $installer DatabaseInstaller so we can make callbacks
1529          * @return array
1530          */
1531         protected function getInstallSteps( DatabaseInstaller $installer ) {
1532                 $coreInstallSteps = array(
1533                         array( 'name' => 'database', 'callback' => array( $installer, 'setupDatabase' ) ),
1534                         array( 'name' => 'tables', 'callback' => array( $installer, 'createTables' ) ),
1535                         array( 'name' => 'interwiki', 'callback' => array( $installer, 'populateInterwikiTable' ) ),
1536                         array( 'name' => 'stats', 'callback' => array( $this, 'populateSiteStats' ) ),
1537                         array( 'name' => 'keys', 'callback' => array( $this, 'generateKeys' ) ),
1538                         array( 'name' => 'updates', 'callback' => array( $installer, 'insertUpdateKeys' ) ),
1539                         array( 'name' => 'sysop', 'callback' => array( $this, 'createSysop' ) ),
1540                         array( 'name' => 'mainpage', 'callback' => array( $this, 'createMainpage' ) ),
1541                 );
1542
1543                 // Build the array of install steps starting from the core install list,
1544                 // then adding any callbacks that wanted to attach after a given step
1545                 foreach ( $coreInstallSteps as $step ) {
1546                         $this->installSteps[] = $step;
1547                         if ( isset( $this->extraInstallSteps[$step['name']] ) ) {
1548                                 $this->installSteps = array_merge(
1549                                         $this->installSteps,
1550                                         $this->extraInstallSteps[$step['name']]
1551                                 );
1552                         }
1553                 }
1554
1555                 // Prepend any steps that want to be at the beginning
1556                 if ( isset( $this->extraInstallSteps['BEGINNING'] ) ) {
1557                         $this->installSteps = array_merge(
1558                                 $this->extraInstallSteps['BEGINNING'],
1559                                 $this->installSteps
1560                         );
1561                 }
1562
1563                 // Extensions should always go first, chance to tie into hooks and such
1564                 if ( count( $this->getVar( '_Extensions' ) ) ) {
1565                         array_unshift( $this->installSteps,
1566                                 array( 'name' => 'extensions', 'callback' => array( $this, 'includeExtensions' ) )
1567                         );
1568                         $this->installSteps[] = array(
1569                                 'name' => 'extension-tables',
1570                                 'callback' => array( $installer, 'createExtensionTables' )
1571                         );
1572                 }
1573
1574                 return $this->installSteps;
1575         }
1576
1577         /**
1578          * Actually perform the installation.
1579          *
1580          * @param callable $startCB A callback array for the beginning of each step
1581          * @param callable $endCB A callback array for the end of each step
1582          *
1583          * @return array Array of Status objects
1584          */
1585         public function performInstallation( $startCB, $endCB ) {
1586                 $installResults = array();
1587                 $installer = $this->getDBInstaller();
1588                 $installer->preInstall();
1589                 $steps = $this->getInstallSteps( $installer );
1590                 foreach ( $steps as $stepObj ) {
1591                         $name = $stepObj['name'];
1592                         call_user_func_array( $startCB, array( $name ) );
1593
1594                         // Perform the callback step
1595                         $status = call_user_func( $stepObj['callback'], $installer );
1596
1597                         // Output and save the results
1598                         call_user_func( $endCB, $name, $status );
1599                         $installResults[$name] = $status;
1600
1601                         // If we've hit some sort of fatal, we need to bail.
1602                         // Callback already had a chance to do output above.
1603                         if ( !$status->isOk() ) {
1604                                 break;
1605                         }
1606                 }
1607                 if ( $status->isOk() ) {
1608                         $this->setVar( '_InstallDone', true );
1609                 }
1610
1611                 return $installResults;
1612         }
1613
1614         /**
1615          * Generate $wgSecretKey. Will warn if we had to use an insecure random source.
1616          *
1617          * @return Status
1618          */
1619         public function generateKeys() {
1620                 $keys = array( 'wgSecretKey' => 64 );
1621                 if ( strval( $this->getVar( 'wgUpgradeKey' ) ) === '' ) {
1622                         $keys['wgUpgradeKey'] = 16;
1623                 }
1624
1625                 return $this->doGenerateKeys( $keys );
1626         }
1627
1628         /**
1629          * Generate a secret value for variables using our CryptRand generator.
1630          * Produce a warning if the random source was insecure.
1631          *
1632          * @param array $keys
1633          * @return Status
1634          */
1635         protected function doGenerateKeys( $keys ) {
1636                 $status = Status::newGood();
1637
1638                 $strong = true;
1639                 foreach ( $keys as $name => $length ) {
1640                         $secretKey = MWCryptRand::generateHex( $length, true );
1641                         if ( !MWCryptRand::wasStrong() ) {
1642                                 $strong = false;
1643                         }
1644
1645                         $this->setVar( $name, $secretKey );
1646                 }
1647
1648                 if ( !$strong ) {
1649                         $names = array_keys( $keys );
1650                         $names = preg_replace( '/^(.*)$/', '\$$1', $names );
1651                         global $wgLang;
1652                         $status->warning( 'config-insecure-keys', $wgLang->listToText( $names ), count( $names ) );
1653                 }
1654
1655                 return $status;
1656         }
1657
1658         /**
1659          * Create the first user account, grant it sysop and bureaucrat rights
1660          *
1661          * @return Status
1662          */
1663         protected function createSysop() {
1664                 $name = $this->getVar( '_AdminName' );
1665                 $user = User::newFromName( $name );
1666
1667                 if ( !$user ) {
1668                         // We should've validated this earlier anyway!
1669                         return Status::newFatal( 'config-admin-error-user', $name );
1670                 }
1671
1672                 if ( $user->idForName() == 0 ) {
1673                         $user->addToDatabase();
1674
1675                         try {
1676                                 $user->setPassword( $this->getVar( '_AdminPassword' ) );
1677                         } catch ( PasswordError $pwe ) {
1678                                 return Status::newFatal( 'config-admin-error-password', $name, $pwe->getMessage() );
1679                         }
1680
1681                         $user->addGroup( 'sysop' );
1682                         $user->addGroup( 'bureaucrat' );
1683                         if ( $this->getVar( '_AdminEmail' ) ) {
1684                                 $user->setEmail( $this->getVar( '_AdminEmail' ) );
1685                         }
1686                         $user->saveSettings();
1687
1688                         // Update user count
1689                         $ssUpdate = new SiteStatsUpdate( 0, 0, 0, 0, 1 );
1690                         $ssUpdate->doUpdate();
1691                 }
1692                 $status = Status::newGood();
1693
1694                 if ( $this->getVar( '_Subscribe' ) && $this->getVar( '_AdminEmail' ) ) {
1695                         $this->subscribeToMediaWikiAnnounce( $status );
1696                 }
1697
1698                 return $status;
1699         }
1700
1701         /**
1702          * @param Status $s
1703          */
1704         private function subscribeToMediaWikiAnnounce( Status $s ) {
1705                 $params = array(
1706                         'email' => $this->getVar( '_AdminEmail' ),
1707                         'language' => 'en',
1708                         'digest' => 0
1709                 );
1710
1711                 // Mailman doesn't support as many languages as we do, so check to make
1712                 // sure their selected language is available
1713                 $myLang = $this->getVar( '_UserLang' );
1714                 if ( in_array( $myLang, $this->mediaWikiAnnounceLanguages ) ) {
1715                         $myLang = $myLang == 'pt-br' ? 'pt_BR' : $myLang; // rewrite to Mailman's pt_BR
1716                         $params['language'] = $myLang;
1717                 }
1718
1719                 if ( MWHttpRequest::canMakeRequests() ) {
1720                         $res = MWHttpRequest::factory( $this->mediaWikiAnnounceUrl,
1721                                 array( 'method' => 'POST', 'postData' => $params ), __METHOD__ )->execute();
1722                         if ( !$res->isOK() ) {
1723                                 $s->warning( 'config-install-subscribe-fail', $res->getMessage() );
1724                         }
1725                 } else {
1726                         $s->warning( 'config-install-subscribe-notpossible' );
1727                 }
1728         }
1729
1730         /**
1731          * Insert Main Page with default content.
1732          *
1733          * @param DatabaseInstaller $installer
1734          * @return Status
1735          */
1736         protected function createMainpage( DatabaseInstaller $installer ) {
1737                 $status = Status::newGood();
1738                 try {
1739                         $page = WikiPage::factory( Title::newMainPage() );
1740                         $content = new WikitextContent(
1741                                 wfMessage( 'mainpagetext' )->inContentLanguage()->text() . "\n\n" .
1742                                 wfMessage( 'mainpagedocfooter' )->inContentLanguage()->text()
1743                         );
1744
1745                         $page->doEditContent( $content,
1746                                 '',
1747                                 EDIT_NEW,
1748                                 false,
1749                                 User::newFromName( 'MediaWiki default' )
1750                         );
1751                 } catch ( Exception $e ) {
1752                         // using raw, because $wgShowExceptionDetails can not be set yet
1753                         $status->fatal( 'config-install-mainpage-failed', $e->getMessage() );
1754                 }
1755
1756                 return $status;
1757         }
1758
1759         /**
1760          * Override the necessary bits of the config to run an installation.
1761          */
1762         public static function overrideConfig() {
1763                 define( 'MW_NO_SESSION', 1 );
1764
1765                 // Don't access the database
1766                 $GLOBALS['wgUseDatabaseMessages'] = false;
1767                 // Don't cache langconv tables
1768                 $GLOBALS['wgLanguageConverterCacheType'] = CACHE_NONE;
1769                 // Debug-friendly
1770                 $GLOBALS['wgShowExceptionDetails'] = true;
1771                 // Don't break forms
1772                 $GLOBALS['wgExternalLinkTarget'] = '_blank';
1773
1774                 // Extended debugging
1775                 $GLOBALS['wgShowSQLErrors'] = true;
1776                 $GLOBALS['wgShowDBErrorBacktrace'] = true;
1777
1778                 // Allow multiple ob_flush() calls
1779                 $GLOBALS['wgDisableOutputCompression'] = true;
1780
1781                 // Use a sensible cookie prefix (not my_wiki)
1782                 $GLOBALS['wgCookiePrefix'] = 'mw_installer';
1783
1784                 // Some of the environment checks make shell requests, remove limits
1785                 $GLOBALS['wgMaxShellMemory'] = 0;
1786         }
1787
1788         /**
1789          * Add an installation step following the given step.
1790          *
1791          * @param callable $callback A valid installation callback array, in this form:
1792          *    array( 'name' => 'some-unique-name', 'callback' => array( $obj, 'function' ) );
1793          * @param string $findStep The step to find. Omit to put the step at the beginning
1794          */
1795         public function addInstallStep( $callback, $findStep = 'BEGINNING' ) {
1796                 $this->extraInstallSteps[$findStep][] = $callback;
1797         }
1798
1799         /**
1800          * Disable the time limit for execution.
1801          * Some long-running pages (Install, Upgrade) will want to do this
1802          */
1803         protected function disableTimeLimit() {
1804                 MediaWiki\suppressWarnings();
1805                 set_time_limit( 0 );
1806                 MediaWiki\restoreWarnings();
1807         }
1808 }