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                 'wgMainCacheType',
 168                 'wgEnableEmail',
 169                 'wgEnableUserEmail',
 170                 'wgEnotifUserTalk',
 171                 'wgEnotifWatchlist',
 172                 'wgEmailAuthentication',
 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 $licenses = array(
 284                 'cc-by' => array(
 285                         'url' => 'https://creativecommons.org/licenses/by/3.0/',
 286                         'icon' => '$wgResourceBasePath/resources/assets/licenses/cc-by.png',
 287                 ),
 288                 'cc-by-sa' => array(
 289                         'url' => 'https://creativecommons.org/licenses/by-sa/3.0/',
 290                         'icon' => '$wgResourceBasePath/resources/assets/licenses/cc-by-sa.png',
 291                 ),
 292                 'cc-by-nc-sa' => array(
 293                         'url' => 'https://creativecommons.org/licenses/by-nc-sa/3.0/',
 294                         'icon' => '$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                 $GLOBALS['wgObjectCaches'] = array(
 374                         CACHE_NONE => $emptyCache,
 375                         CACHE_DB => $emptyCache,
 376                         CACHE_ANYTHING => $emptyCache,
 377                         CACHE_MEMCACHED => $emptyCache,
 378                 );
 379
 380                 // Load the installer's i18n.
 381                 $wgMessagesDirs['MediawikiInstaller'] = __DIR__ . '/i18n';
 382
 383                 // Having a user with id = 0 safeguards us from DB access via User::loadOptions().
 384                 $wgUser = User::newFromId( 0 );
 385
 386                 $this->settings = $this->internalDefaults;
 387
 388                 foreach ( $this->defaultVarNames as $var ) {
 389                         $this->settings[$var] = $GLOBALS[$var];
 390                 }
 391
 392                 $this->doEnvironmentPreps();
 393
 394                 $this->compiledDBs = array();
 395                 foreach ( self::getDBTypes() as $type ) {
 396                         $installer = $this->getDBInstaller( $type );
 397
 398                         if ( !$installer->isCompiled() ) {
 399                                 continue;
 400                         }
 401                         $this->compiledDBs[] = $type;
 402                 }
 403
 404                 $this->parserTitle = Title::newFromText( 'Installer' );
 405                 $this->parserOptions = new ParserOptions; // language will be wrong :(
 406                 $this->parserOptions->setEditSection( false );
 407         }
 408
 409         /**
 410          * Get a list of known DB types.
 411          *
 412          * @return array
 413          */
 414         public static function getDBTypes() {
 415                 return self::$dbTypes;
 416         }
 417
 418         /**
 419          * Do initial checks of the PHP environment. Set variables according to
 420          * the observed environment.
 421          *
 422          * It's possible that this may be called under the CLI SAPI, not the SAPI
 423          * that the wiki will primarily run under. In that case, the subclass should
 424          * initialise variables such as wgScriptPath, before calling this function.
 425          *
 426          * Under the web subclass, it can already be assumed that PHP 5+ is in use
 427          * and that sessions are working.
 428          *
 429          * @return Status
 430          */
 431         public function doEnvironmentChecks() {
 432                 // Php version has already been checked by entry scripts
 433                 // Show message here for information purposes
 434                 if ( wfIsHHVM() ) {
 435                         $this->showMessage( 'config-env-hhvm', HHVM_VERSION );
 436                 } else {
 437                         $this->showMessage( 'config-env-php', PHP_VERSION );
 438                 }
 439
 440                 $good = true;
 441                 // Must go here because an old version of PCRE can prevent other checks from completing
 442                 list( $pcreVersion ) = explode( ' ', PCRE_VERSION, 2 );
 443                 if ( version_compare( $pcreVersion, self::MINIMUM_PCRE_VERSION, '<' ) ) {
 444                         $this->showError( 'config-pcre-old', self::MINIMUM_PCRE_VERSION, $pcreVersion );
 445                         $good = false;
 446                 } else {
 447                         foreach ( $this->envChecks as $check ) {
 448                                 $status = $this->$check();
 449                                 if ( $status === false ) {
 450                                         $good = false;
 451                                 }
 452                         }
 453                 }
 454
 455                 $this->setVar( '_Environment', $good );
 456
 457                 return $good ? Status::newGood() : Status::newFatal( 'config-env-bad' );
 458         }
 459
 460         public function doEnvironmentPreps() {
 461                 foreach ( $this->envPreps as $prep ) {
 462                         $this->$prep();
 463                 }
 464         }
 465
 466         /**
 467          * Set a MW configuration variable, or internal installer configuration variable.
 468          *
 469          * @param string $name
 470          * @param mixed $value
 471          */
 472         public function setVar( $name, $value ) {
 473                 $this->settings[$name] = $value;
 474         }
 475
 476         /**
 477          * Get an MW configuration variable, or internal installer configuration variable.
 478          * The defaults come from $GLOBALS (ultimately DefaultSettings.php).
 479          * Installer variables are typically prefixed by an underscore.
 480          *
 481          * @param string $name
 482          * @param mixed $default
 483          *
 484          * @return mixed
 485          */
 486         public function getVar( $name, $default = null ) {
 487                 if ( !isset( $this->settings[$name] ) ) {
 488                         return $default;
 489                 } else {
 490                         return $this->settings[$name];
 491                 }
 492         }
 493
 494         /**
 495          * Get a list of DBs supported by current PHP setup
 496          *
 497          * @return array
 498          */
 499         public function getCompiledDBs() {
 500                 return $this->compiledDBs;
 501         }
 502
 503         /**
 504          * Get an instance of DatabaseInstaller for the specified DB type.
 505          *
 506          * @param mixed $type DB installer for which is needed, false to use default.
 507          *
 508          * @return DatabaseInstaller
 509          */
 510         public function getDBInstaller( $type = false ) {
 511                 if ( !$type ) {
 512                         $type = $this->getVar( 'wgDBtype' );
 513                 }
 514
 515                 $type = strtolower( $type );
 516
 517                 if ( !isset( $this->dbInstallers[$type] ) ) {
 518                         $class = ucfirst( $type ) . 'Installer';
 519                         $this->dbInstallers[$type] = new $class( $this );
 520                 }
 521
 522                 return $this->dbInstallers[$type];
 523         }
 524
 525         /**
 526          * Determine if LocalSettings.php exists. If it does, return its variables.
 527          *
 528          * @return array
 529          */
 530         public static function getExistingLocalSettings() {
 531                 global $IP;
 532
 533                 // You might be wondering why this is here. Well if you don't do this
 534                 // then some poorly-formed extensions try to call their own classes
 535                 // after immediately registering them. We really need to get extension
 536                 // registration out of the global scope and into a real format.
 537                 // @see https://bugzilla.wikimedia.org/67440
 538                 global $wgAutoloadClasses;
 539                 $wgAutoloadClasses = array();
 540
 541                 MediaWiki\suppressWarnings();
 542                 $_lsExists = file_exists( "$IP/LocalSettings.php" );
 543                 MediaWiki\restoreWarnings();
 544
 545                 if ( !$_lsExists ) {
 546                         return false;
 547                 }
 548                 unset( $_lsExists );
 549
 550                 require "$IP/includes/DefaultSettings.php";
 551                 require "$IP/LocalSettings.php";
 552
 553                 return get_defined_vars();
 554         }
 555
 556         /**
 557          * Get a fake password for sending back to the user in HTML.
 558          * This is a security mechanism to avoid compromise of the password in the
 559          * event of session ID compromise.
 560          *
 561          * @param string $realPassword
 562          *
 563          * @return string
 564          */
 565         public function getFakePassword( $realPassword ) {
 566                 return str_repeat( '*', strlen( $realPassword ) );
 567         }
 568
 569         /**
 570          * Set a variable which stores a password, except if the new value is a
 571          * fake password in which case leave it as it is.
 572          *
 573          * @param string $name
 574          * @param mixed $value
 575          */
 576         public function setPassword( $name, $value ) {
 577                 if ( !preg_match( '/^\*+$/', $value ) ) {
 578                         $this->setVar( $name, $value );
 579                 }
 580         }
 581
 582         /**
 583          * On POSIX systems return the primary group of the webserver we're running under.
 584          * On other systems just returns null.
 585          *
 586          * This is used to advice the user that he should chgrp his mw-config/data/images directory as the
 587          * webserver user before he can install.
 588          *
 589          * Public because SqliteInstaller needs it, and doesn't subclass Installer.
 590          *
 591          * @return mixed
 592          */
 593         public static function maybeGetWebserverPrimaryGroup() {
 594                 if ( !function_exists( 'posix_getegid' ) || !function_exists( 'posix_getpwuid' ) ) {
 595                         # I don't know this, this isn't UNIX.
 596                         return null;
 597                 }
 598
 599                 # posix_getegid() *not* getmygid() because we want the group of the webserver,
 600                 # not whoever owns the current script.
 601                 $gid = posix_getegid();
 602                 $getpwuid = posix_getpwuid( $gid );
 603                 $group = $getpwuid['name'];
 604
 605                 return $group;
 606         }
 607
 608         /**
 609          * Convert wikitext $text to HTML.
 610          *
 611          * This is potentially error prone since many parser features require a complete
 612          * installed MW database. The solution is to just not use those features when you
 613          * write your messages. This appears to work well enough. Basic formatting and
 614          * external links work just fine.
 615          *
 616          * But in case a translator decides to throw in a "#ifexist" or internal link or
 617          * whatever, this function is guarded to catch the attempted DB access and to present
 618          * some fallback text.
 619          *
 620          * @param string $text
 621          * @param bool $lineStart
 622          * @return string
 623          */
 624         public function parse( $text, $lineStart = false ) {
 625                 global $wgParser;
 626
 627                 try {
 628                         $out = $wgParser->parse( $text, $this->parserTitle, $this->parserOptions, $lineStart );
 629                         $html = $out->getText();
 630                 } catch ( DBAccessError $e ) {
 631                         $html = '<!--DB access attempted during parse-->  ' . htmlspecialchars( $text );
 632
 633                         if ( !empty( $this->debug ) ) {
 634                                 $html .= "<!--\n" . $e->getTraceAsString() . "\n-->";
 635                         }
 636                 }
 637
 638                 return $html;
 639         }
 640
 641         /**
 642          * @return ParserOptions
 643          */
 644         public function getParserOptions() {
 645                 return $this->parserOptions;
 646         }
 647
 648         public function disableLinkPopups() {
 649                 $this->parserOptions->setExternalLinkTarget( false );
 650         }
 651
 652         public function restoreLinkPopups() {
 653                 global $wgExternalLinkTarget;
 654                 $this->parserOptions->setExternalLinkTarget( $wgExternalLinkTarget );
 655         }
 656
 657         /**
 658          * Install step which adds a row to the site_stats table with appropriate
 659          * initial values.
 660          *
 661          * @param DatabaseInstaller $installer
 662          *
 663          * @return Status
 664          */
 665         public function populateSiteStats( DatabaseInstaller $installer ) {
 666                 $status = $installer->getConnection();
 667                 if ( !$status->isOK() ) {
 668                         return $status;
 669                 }
 670                 $status->value->insert(
 671                         'site_stats',
 672                         array(
 673                                 'ss_row_id' => 1,
 674                                 'ss_total_edits' => 0,
 675                                 'ss_good_articles' => 0,
 676                                 'ss_total_pages' => 0,
 677                                 'ss_users' => 0,
 678                                 'ss_images' => 0
 679                         ),
 680                         __METHOD__, 'IGNORE'
 681                 );
 682
 683                 return Status::newGood();
 684         }
 685
 686         /**
 687          * Exports all wg* variables stored by the installer into global scope.
 688          */
 689         public function exportVars() {
 690                 foreach ( $this->settings as $name => $value ) {
 691                         if ( substr( $name, 0, 2 ) == 'wg' ) {
 692                                 $GLOBALS[$name] = $value;
 693                         }
 694                 }
 695         }
 696
 697         /**
 698          * Environment check for DB types.
 699          * @return bool
 700          */
 701         protected function envCheckDB() {
 702                 global $wgLang;
 703
 704                 $allNames = array();
 705
 706                 // Messages: config-type-mysql, config-type-postgres, config-type-oracle,
 707                 // config-type-sqlite
 708                 foreach ( self::getDBTypes() as $name ) {
 709                         $allNames[] = wfMessage( "config-type-$name" )->text();
 710                 }
 711
 712                 $databases = $this->getCompiledDBs();
 713
 714                 $databases = array_flip( $databases );
 715                 foreach ( array_keys( $databases ) as $db ) {
 716                         $installer = $this->getDBInstaller( $db );
 717                         $status = $installer->checkPrerequisites();
 718                         if ( !$status->isGood() ) {
 719                                 $this->showStatusMessage( $status );
 720                         }
 721                         if ( !$status->isOK() ) {
 722                                 unset( $databases[$db] );
 723                         }
 724                 }
 725                 $databases = array_flip( $databases );
 726                 if ( !$databases ) {
 727                         $this->showError( 'config-no-db', $wgLang->commaList( $allNames ), count( $allNames ) );
 728
 729                         // @todo FIXME: This only works for the web installer!
 730                         return false;
 731                 }
 732
 733                 return true;
 734         }
 735
 736         /**
 737          * Environment check for register_globals.
 738          * Prevent installation if enabled
 739          * @return bool
 740          */
 741         protected function envCheckRegisterGlobals() {
 742                 if ( wfIniGetBool( 'register_globals' ) ) {
 743                         $this->showMessage( 'config-register-globals-error' );
 744                         return false;
 745                 }
 746
 747                 return true;
 748         }
 749
 750         /**
 751          * Some versions of libxml+PHP break < and > encoding horribly
 752          * @return bool
 753          */
 754         protected function envCheckBrokenXML() {
 755                 $test = new PhpXmlBugTester();
 756                 if ( !$test->ok ) {
 757                         $this->showError( 'config-brokenlibxml' );
 758
 759                         return false;
 760                 }
 761
 762                 return true;
 763         }
 764
 765         /**
 766          * Environment check for magic_quotes_(gpc|runtime|sybase).
 767          * @return bool
 768          */
 769         protected function envCheckMagicQuotes() {
 770                 $status = true;
 771                 foreach ( array( 'gpc', 'runtime', 'sybase' ) as $magicJunk ) {
 772                         if ( wfIniGetBool( "magic_quotes_$magicJunk" ) ) {
 773                                 $this->showError( "config-magic-quotes-$magicJunk" );
 774                                 $status = false;
 775                         }
 776                 }
 777
 778                 return $status;
 779         }
 780
 781         /**
 782          * Environment check for mbstring.func_overload.
 783          * @return bool
 784          */
 785         protected function envCheckMbstring() {
 786                 if ( wfIniGetBool( 'mbstring.func_overload' ) ) {
 787                         $this->showError( 'config-mbstring' );
 788
 789                         return false;
 790                 }
 791
 792                 return true;
 793         }
 794
 795         /**
 796          * Environment check for safe_mode.
 797          * @return bool
 798          */
 799         protected function envCheckSafeMode() {
 800                 if ( wfIniGetBool( 'safe_mode' ) ) {
 801                         $this->setVar( '_SafeMode', true );
 802                         $this->showMessage( 'config-safe-mode' );
 803                 }
 804
 805                 return true;
 806         }
 807
 808         /**
 809          * Environment check for the XML module.
 810          * @return bool
 811          */
 812         protected function envCheckXML() {
 813                 if ( !function_exists( "utf8_encode" ) ) {
 814                         $this->showError( 'config-xml-bad' );
 815
 816                         return false;
 817                 }
 818
 819                 return true;
 820         }
 821
 822         /**
 823          * Environment check for the PCRE module.
 824          *
 825          * @note If this check were to fail, the parser would
 826          *   probably throw an exception before the result
 827          *   of this check is shown to the user.
 828          * @return bool
 829          */
 830         protected function envCheckPCRE() {
 831                 MediaWiki\suppressWarnings();
 832                 $regexd = preg_replace( '/[\x{0430}-\x{04FF}]/iu', '', '-АБВГД-' );
 833                 // Need to check for \p support too, as PCRE can be compiled
 834                 // with utf8 support, but not unicode property support.
 835                 // check that \p{Zs} (space separators) matches
 836                 // U+3000 (Ideographic space)
 837                 $regexprop = preg_replace( '/\p{Zs}/u', '', "-\xE3\x80\x80-" );
 838                 MediaWiki\restoreWarnings();
 839                 if ( $regexd != '--' || $regexprop != '--' ) {
 840                         $this->showError( 'config-pcre-no-utf8' );
 841
 842                         return false;
 843                 }
 844
 845                 return true;
 846         }
 847
 848         /**
 849          * Environment check for available memory.
 850          * @return bool
 851          */
 852         protected function envCheckMemory() {
 853                 $limit = ini_get( 'memory_limit' );
 854
 855                 if ( !$limit || $limit == -1 ) {
 856                         return true;
 857                 }
 858
 859                 $n = wfShorthandToInteger( $limit );
 860
 861                 if ( $n < $this->minMemorySize * 1024 * 1024 ) {
 862                         $newLimit = "{$this->minMemorySize}M";
 863
 864                         if ( ini_set( "memory_limit", $newLimit ) === false ) {
 865                                 $this->showMessage( 'config-memory-bad', $limit );
 866                         } else {
 867                                 $this->showMessage( 'config-memory-raised', $limit, $newLimit );
 868                                 $this->setVar( '_RaiseMemory', true );
 869                         }
 870                 }
 871
 872                 return true;
 873         }
 874
 875         /**
 876          * Environment check for compiled object cache types.
 877          */
 878         protected function envCheckCache() {
 879                 $caches = array();
 880                 foreach ( $this->objectCaches as $name => $function ) {
 881                         if ( function_exists( $function ) ) {
 882                                 if ( $name == 'xcache' && !wfIniGetBool( 'xcache.var_size' ) ) {
 883                                         continue;
 884                                 }
 885                                 $caches[$name] = true;
 886                         }
 887                 }
 888
 889                 if ( !$caches ) {
 890                         $this->showMessage( 'config-no-cache' );
 891                 }
 892
 893                 $this->setVar( '_Caches', $caches );
 894         }
 895
 896         /**
 897          * Scare user to death if they have mod_security or mod_security2
 898          * @return bool
 899          */
 900         protected function envCheckModSecurity() {
 901                 if ( self::apacheModulePresent( 'mod_security' )
 902                         || self::apacheModulePresent( 'mod_security2' ) ) {
 903                         $this->showMessage( 'config-mod-security' );
 904                 }
 905
 906                 return true;
 907         }
 908
 909         /**
 910          * Search for GNU diff3.
 911          * @return bool
 912          */
 913         protected function envCheckDiff3() {
 914                 $names = array( "gdiff3", "diff3", "diff3.exe" );
 915                 $versionInfo = array( '$1 --version 2>&1', 'GNU diffutils' );
 916
 917                 $diff3 = self::locateExecutableInDefaultPaths( $names, $versionInfo );
 918
 919                 if ( $diff3 ) {
 920                         $this->setVar( 'wgDiff3', $diff3 );
 921                 } else {
 922                         $this->setVar( 'wgDiff3', false );
 923                         $this->showMessage( 'config-diff3-bad' );
 924                 }
 925
 926                 return true;
 927         }
 928
 929         /**
 930          * Environment check for ImageMagick and GD.
 931          * @return bool
 932          */
 933         protected function envCheckGraphics() {
 934                 $names = array( wfIsWindows() ? 'convert.exe' : 'convert' );
 935                 $versionInfo = array( '$1 -version', 'ImageMagick' );
 936                 $convert = self::locateExecutableInDefaultPaths( $names, $versionInfo );
 937
 938                 $this->setVar( 'wgImageMagickConvertCommand', '' );
 939                 if ( $convert ) {
 940                         $this->setVar( 'wgImageMagickConvertCommand', $convert );
 941                         $this->showMessage( 'config-imagemagick', $convert );
 942
 943                         return true;
 944                 } elseif ( function_exists( 'imagejpeg' ) ) {
 945                         $this->showMessage( 'config-gd' );
 946                 } else {
 947                         $this->showMessage( 'config-no-scaling' );
 948                 }
 949
 950                 return true;
 951         }
 952
 953         /**
 954          * Search for git.
 955          *
 956          * @since 1.22
 957          * @return bool
 958          */
 959         protected function envCheckGit() {
 960                 $names = array( wfIsWindows() ? 'git.exe' : 'git' );
 961                 $versionInfo = array( '$1 --version', 'git version' );
 962
 963                 $git = self::locateExecutableInDefaultPaths( $names, $versionInfo );
 964
 965                 if ( $git ) {
 966                         $this->setVar( 'wgGitBin', $git );
 967                         $this->showMessage( 'config-git', $git );
 968                 } else {
 969                         $this->setVar( 'wgGitBin', false );
 970                         $this->showMessage( 'config-git-bad' );
 971                 }
 972
 973                 return true;
 974         }
 975
 976         /**
 977          * Environment check to inform user which server we've assumed.
 978          *
 979          * @return bool
 980          */
 981         protected function envCheckServer() {
 982                 $server = $this->envGetDefaultServer();
 983                 if ( $server !== null ) {
 984                         $this->showMessage( 'config-using-server', $server );
 985                 }
 986                 return true;
 987         }
 988
 989         /**
 990          * Environment check to inform user which paths we've assumed.
 991          *
 992          * @return bool
 993          */
 994         protected function envCheckPath() {
 995                 $this->showMessage(
 996                         'config-using-uri',
 997                         $this->getVar( 'wgServer' ),
 998                         $this->getVar( 'wgScriptPath' )
 999                 );
1000                 return true;
1001         }
1002
1003         /**
1004          * Environment check for preferred locale in shell
1005          * @return bool
1006          */
1007         protected function envCheckShellLocale() {
1008                 $os = php_uname( 's' );
1009                 $supported = array( 'Linux', 'SunOS', 'HP-UX', 'Darwin' ); # Tested these
1010
1011                 if ( !in_array( $os, $supported ) ) {
1012                         return true;
1013                 }
1014
1015                 # Get a list of available locales.
1016                 $ret = false;
1017                 $lines = wfShellExec( '/usr/bin/locale -a', $ret );
1018
1019                 if ( $ret ) {
1020                         return true;
1021                 }
1022
1023                 $lines = array_map( 'trim', explode( "\n", $lines ) );
1024                 $candidatesByLocale = array();
1025                 $candidatesByLang = array();
1026
1027                 foreach ( $lines as $line ) {
1028                         if ( $line === '' ) {
1029                                 continue;
1030                         }
1031
1032                         if ( !preg_match( '/^([a-zA-Z]+)(_[a-zA-Z]+|)\.(utf8|UTF-8)(@[a-zA-Z_]*|)$/i', $line, $m ) ) {
1033                                 continue;
1034                         }
1035
1036                         list( , $lang, , , ) = $m;
1037
1038                         $candidatesByLocale[$m[0]] = $m;
1039                         $candidatesByLang[$lang][] = $m;
1040                 }
1041
1042                 # Try the current value of LANG.
1043                 if ( isset( $candidatesByLocale[getenv( 'LANG' )] ) ) {
1044                         $this->setVar( 'wgShellLocale', getenv( 'LANG' ) );
1045
1046                         return true;
1047                 }
1048
1049                 # Try the most common ones.
1050                 $commonLocales = array( 'en_US.UTF-8', 'en_US.utf8', 'de_DE.UTF-8', 'de_DE.utf8' );
1051                 foreach ( $commonLocales as $commonLocale ) {
1052                         if ( isset( $candidatesByLocale[$commonLocale] ) ) {
1053                                 $this->setVar( 'wgShellLocale', $commonLocale );
1054
1055                                 return true;
1056                         }
1057                 }
1058
1059                 # Is there an available locale in the Wiki's language?
1060                 $wikiLang = $this->getVar( 'wgLanguageCode' );
1061
1062                 if ( isset( $candidatesByLang[$wikiLang] ) ) {
1063                         $m = reset( $candidatesByLang[$wikiLang] );
1064                         $this->setVar( 'wgShellLocale', $m[0] );
1065
1066                         return true;
1067                 }
1068
1069                 # Are there any at all?
1070                 if ( count( $candidatesByLocale ) ) {
1071                         $m = reset( $candidatesByLocale );
1072                         $this->setVar( 'wgShellLocale', $m[0] );
1073
1074                         return true;
1075                 }
1076
1077                 # Give up.
1078                 return true;
1079         }
1080
1081         /**
1082          * Environment check for the permissions of the uploads directory
1083          * @return bool
1084          */
1085         protected function envCheckUploadsDirectory() {
1086                 global $IP;
1087
1088                 $dir = $IP . '/images/';
1089                 $url = $this->getVar( 'wgServer' ) . $this->getVar( 'wgScriptPath' ) . '/images/';
1090                 $safe = !$this->dirIsExecutable( $dir, $url );
1091
1092                 if ( !$safe ) {
1093                         $this->showMessage( 'config-uploads-not-safe', $dir );
1094                 }
1095
1096                 return true;
1097         }
1098
1099         /**
1100          * Checks if suhosin.get.max_value_length is set, and if so generate
1101          * a warning because it decreases ResourceLoader performance.
1102          * @return bool
1103          */
1104         protected function envCheckSuhosinMaxValueLength() {
1105                 $maxValueLength = ini_get( 'suhosin.get.max_value_length' );
1106                 if ( $maxValueLength > 0 && $maxValueLength < 1024 ) {
1107                         // Only warn if the value is below the sane 1024
1108                         $this->showMessage( 'config-suhosin-max-value-length', $maxValueLength );
1109                 }
1110
1111                 return true;
1112         }
1113
1114         /**
1115          * Convert a hex string representing a Unicode code point to that code point.
1116          * @param string $c
1117          * @return string
1118          */
1119         protected function unicodeChar( $c ) {
1120                 $c = hexdec( $c );
1121                 if ( $c <= 0x7F ) {
1122                         return chr( $c );
1123                 } elseif ( $c <= 0x7FF ) {
1124                         return chr( 0xC0 | $c >> 6 ) . chr( 0x80 | $c & 0x3F );
1125                 } elseif ( $c <= 0xFFFF ) {
1126                         return chr( 0xE0 | $c >> 12 ) . chr( 0x80 | $c >> 6 & 0x3F )
1127                         . chr( 0x80 | $c & 0x3F );
1128                 } elseif ( $c <= 0x10FFFF ) {
1129                         return chr( 0xF0 | $c >> 18 ) . chr( 0x80 | $c >> 12 & 0x3F )
1130                         . chr( 0x80 | $c >> 6 & 0x3F )
1131                         . chr( 0x80 | $c & 0x3F );
1132                 } else {
1133                         return false;
1134                 }
1135         }
1136
1137         /**
1138          * Check the libicu version
1139          */
1140         protected function envCheckLibicu() {
1141                 /**
1142                  * This needs to be updated something that the latest libicu
1143                  * will properly normalize.  This normalization was found at
1144                  * http://www.unicode.org/versions/Unicode5.2.0/#Character_Additions
1145                  * Note that we use the hex representation to create the code
1146                  * points in order to avoid any Unicode-destroying during transit.
1147                  */
1148                 $not_normal_c = $this->unicodeChar( "FA6C" );
1149                 $normal_c = $this->unicodeChar( "242EE" );
1150
1151                 $useNormalizer = 'php';
1152                 $needsUpdate = false;
1153
1154                 if ( function_exists( 'normalizer_normalize' ) ) {
1155                         $useNormalizer = 'intl';
1156                         $intl = normalizer_normalize( $not_normal_c, Normalizer::FORM_C );
1157                         if ( $intl !== $normal_c ) {
1158                                 $needsUpdate = true;
1159                         }
1160                 }
1161
1162                 // Uses messages 'config-unicode-using-php' and 'config-unicode-using-intl'
1163                 if ( $useNormalizer === 'php' ) {
1164                         $this->showMessage( 'config-unicode-pure-php-warning' );
1165                 } else {
1166                         $this->showMessage( 'config-unicode-using-' . $useNormalizer );
1167                         if ( $needsUpdate ) {
1168                                 $this->showMessage( 'config-unicode-update-warning' );
1169                         }
1170                 }
1171         }
1172
1173         /**
1174          * @return bool
1175          */
1176         protected function envCheckCtype() {
1177                 if ( !function_exists( 'ctype_digit' ) ) {
1178                         $this->showError( 'config-ctype' );
1179
1180                         return false;
1181                 }
1182
1183                 return true;
1184         }
1185
1186         /**
1187          * @return bool
1188          */
1189         protected function envCheckIconv() {
1190                 if ( !function_exists( 'iconv' ) ) {
1191                         $this->showError( 'config-iconv' );
1192
1193                         return false;
1194                 }
1195
1196                 return true;
1197         }
1198
1199         /**
1200          * @return bool
1201          */
1202         protected function envCheckJSON() {
1203                 if ( !function_exists( 'json_decode' ) ) {
1204                         $this->showError( 'config-json' );
1205
1206                         return false;
1207                 }
1208
1209                 return true;
1210         }
1211
1212         /**
1213          * Environment prep for the server hostname.
1214          */
1215         protected function envPrepServer() {
1216                 $server = $this->envGetDefaultServer();
1217                 if ( $server !== null ) {
1218                         $this->setVar( 'wgServer', $server );
1219                 }
1220         }
1221
1222         /**
1223          * Helper function to be called from envPrepServer()
1224          * @return string
1225          */
1226         abstract protected function envGetDefaultServer();
1227
1228         /**
1229          * Environment prep for setting $IP and $wgScriptPath.
1230          */
1231         protected function envPrepPath() {
1232                 global $IP;
1233                 $IP = dirname( dirname( __DIR__ ) );
1234                 $this->setVar( 'IP', $IP );
1235         }
1236
1237         /**
1238          * Get an array of likely places we can find executables. Check a bunch
1239          * of known Unix-like defaults, as well as the PATH environment variable
1240          * (which should maybe make it work for Windows?)
1241          *
1242          * @return array
1243          */
1244         protected static function getPossibleBinPaths() {
1245                 return array_merge(
1246                         array( '/usr/bin', '/usr/local/bin', '/opt/csw/bin',
1247                                 '/usr/gnu/bin', '/usr/sfw/bin', '/sw/bin', '/opt/local/bin' ),
1248                         explode( PATH_SEPARATOR, getenv( 'PATH' ) )
1249                 );
1250         }
1251
1252         /**
1253          * Search a path for any of the given executable names. Returns the
1254          * executable name if found. Also checks the version string returned
1255          * by each executable.
1256          *
1257          * Used only by environment checks.
1258          *
1259          * @param string $path Path to search
1260          * @param array $names Array of executable names
1261          * @param array|bool $versionInfo False or array with two members:
1262          *   0 => Command to run for version check, with $1 for the full executable name
1263          *   1 => String to compare the output with
1264          *
1265          * If $versionInfo is not false, only executables with a version
1266          * matching $versionInfo[1] will be returned.
1267          * @return bool|string
1268          */
1269         public static function locateExecutable( $path, $names, $versionInfo = false ) {
1270                 if ( !is_array( $names ) ) {
1271                         $names = array( $names );
1272                 }
1273
1274                 foreach ( $names as $name ) {
1275                         $command = $path . DIRECTORY_SEPARATOR . $name;
1276
1277                         MediaWiki\suppressWarnings();
1278                         $file_exists = file_exists( $command );
1279                         MediaWiki\restoreWarnings();
1280
1281                         if ( $file_exists ) {
1282                                 if ( !$versionInfo ) {
1283                                         return $command;
1284                                 }
1285
1286                                 $file = str_replace( '$1', wfEscapeShellArg( $command ), $versionInfo[0] );
1287                                 if ( strstr( wfShellExec( $file ), $versionInfo[1] ) !== false ) {
1288                                         return $command;
1289                                 }
1290                         }
1291                 }
1292
1293                 return false;
1294         }
1295
1296         /**
1297          * Same as locateExecutable(), but checks in getPossibleBinPaths() by default
1298          * @see locateExecutable()
1299          * @param array $names Array of possible names.
1300          * @param array|bool $versionInfo Default: false or array with two members:
1301          *   0 => Command to run for version check, with $1 for the full executable name
1302          *   1 => String to compare the output with
1303          *
1304          * If $versionInfo is not false, only executables with a version
1305          * matching $versionInfo[1] will be returned.
1306          * @return bool|string
1307          */
1308         public static function locateExecutableInDefaultPaths( $names, $versionInfo = false ) {
1309                 foreach ( self::getPossibleBinPaths() as $path ) {
1310                         $exe = self::locateExecutable( $path, $names, $versionInfo );
1311                         if ( $exe !== false ) {
1312                                 return $exe;
1313                         }
1314                 }
1315
1316                 return false;
1317         }
1318
1319         /**
1320          * Checks if scripts located in the given directory can be executed via the given URL.
1321          *
1322          * Used only by environment checks.
1323          * @param string $dir
1324          * @param string $url
1325          * @return bool|int|string
1326          */
1327         public function dirIsExecutable( $dir, $url ) {
1328                 $scriptTypes = array(
1329                         'php' => array(
1330                                 "<?php echo 'ex' . 'ec';",
1331                                 "#!/var/env php5\n<?php echo 'ex' . 'ec';",
1332                         ),
1333                 );
1334
1335                 // it would be good to check other popular languages here, but it'll be slow.
1336
1337                 MediaWiki\suppressWarnings();
1338
1339                 foreach ( $scriptTypes as $ext => $contents ) {
1340                         foreach ( $contents as $source ) {
1341                                 $file = 'exectest.' . $ext;
1342
1343                                 if ( !file_put_contents( $dir . $file, $source ) ) {
1344                                         break;
1345                                 }
1346
1347                                 try {
1348                                         $text = Http::get( $url . $file, array( 'timeout' => 3 ), __METHOD__ );
1349                                 } catch ( Exception $e ) {
1350                                         // Http::get throws with allow_url_fopen = false and no curl extension.
1351                                         $text = null;
1352                                 }
1353                                 unlink( $dir . $file );
1354
1355                                 if ( $text == 'exec' ) {
1356                                         MediaWiki\restoreWarnings();
1357
1358                                         return $ext;
1359                                 }
1360                         }
1361                 }
1362
1363                 MediaWiki\restoreWarnings();
1364
1365                 return false;
1366         }
1367
1368         /**
1369          * Checks for presence of an Apache module. Works only if PHP is running as an Apache module, too.
1370          *
1371          * @param string $moduleName Name of module to check.
1372          * @return bool
1373          */
1374         public static function apacheModulePresent( $moduleName ) {
1375                 if ( function_exists( 'apache_get_modules' ) && in_array( $moduleName, apache_get_modules() ) ) {
1376                         return true;
1377                 }
1378                 // try it the hard way
1379                 ob_start();
1380                 phpinfo( INFO_MODULES );
1381                 $info = ob_get_clean();
1382
1383                 return strpos( $info, $moduleName ) !== false;
1384         }
1385
1386         /**
1387          * ParserOptions are constructed before we determined the language, so fix it
1388          *
1389          * @param Language $lang
1390          */
1391         public function setParserLanguage( $lang ) {
1392                 $this->parserOptions->setTargetLanguage( $lang );
1393                 $this->parserOptions->setUserLang( $lang );
1394         }
1395
1396         /**
1397          * Overridden by WebInstaller to provide lastPage parameters.
1398          * @param string $page
1399          * @return string
1400          */
1401         protected function getDocUrl( $page ) {
1402                 return "{$_SERVER['PHP_SELF']}?page=" . urlencode( $page );
1403         }
1404
1405         /**
1406          * Finds extensions that follow the format /$directory/Name/Name.php,
1407          * and returns an array containing the value for 'Name' for each found extension.
1408          *
1409          * Reasonable values for $directory include 'extensions' (the default) and 'skins'.
1410          *
1411          * @param string $directory Directory to search in
1412          * @return array
1413          */
1414         public function findExtensions( $directory = 'extensions' ) {
1415                 if ( $this->getVar( 'IP' ) === null ) {
1416                         return array();
1417                 }
1418
1419                 $extDir = $this->getVar( 'IP' ) . '/' . $directory;
1420                 if ( !is_readable( $extDir ) || !is_dir( $extDir ) ) {
1421                         return array();
1422                 }
1423
1424                 // extensions -> extension.json, skins -> skin.json
1425                 $jsonFile = substr( $directory, 0, strlen( $directory ) -1 ) . '.json';
1426
1427                 $dh = opendir( $extDir );
1428                 $exts = array();
1429                 while ( ( $file = readdir( $dh ) ) !== false ) {
1430                         if ( !is_dir( "$extDir/$file" ) ) {
1431                                 continue;
1432                         }
1433                         if ( file_exists( "$extDir/$file/$jsonFile" ) || file_exists( "$extDir/$file/$file.php" ) ) {
1434                                 $exts[] = $file;
1435                         }
1436                 }
1437                 closedir( $dh );
1438                 natcasesort( $exts );
1439
1440                 return $exts;
1441         }
1442
1443         /**
1444          * Returns a default value to be used for $wgDefaultSkin: normally the one set in DefaultSettings,
1445          * but will fall back to another if the default skin is missing and some other one is present
1446          * instead.
1447          *
1448          * @param string[] $skinNames Names of installed skins.
1449          * @return string
1450          */
1451         public function getDefaultSkin( array $skinNames ) {
1452                 $defaultSkin = $GLOBALS['wgDefaultSkin'];
1453                 if ( !$skinNames || in_array( $defaultSkin, $skinNames ) ) {
1454                         return $defaultSkin;
1455                 } else {
1456                         return $skinNames[0];
1457                 }
1458         }
1459
1460         /**
1461          * Installs the auto-detected extensions.
1462          *
1463          * @return Status
1464          */
1465         protected function includeExtensions() {
1466                 global $IP;
1467                 $exts = $this->getVar( '_Extensions' );
1468                 $IP = $this->getVar( 'IP' );
1469
1470                 /**
1471                  * We need to include DefaultSettings before including extensions to avoid
1472                  * warnings about unset variables. However, the only thing we really
1473                  * want here is $wgHooks['LoadExtensionSchemaUpdates']. This won't work
1474                  * if the extension has hidden hook registration in $wgExtensionFunctions,
1475                  * but we're not opening that can of worms
1476                  * @see https://bugzilla.wikimedia.org/show_bug.cgi?id=26857
1477                  */
1478                 global $wgAutoloadClasses;
1479                 $wgAutoloadClasses = array();
1480                 $queue = array();
1481
1482                 require "$IP/includes/DefaultSettings.php";
1483
1484                 foreach ( $exts as $e ) {
1485                         if ( file_exists( "$IP/extensions/$e/extension.json" ) ) {
1486                                 $queue["$IP/extensions/$e/extension.json"] = 1;
1487                         } else {
1488                                 require_once "$IP/extensions/$e/$e.php";
1489                         }
1490                 }
1491
1492                 $registry = new ExtensionRegistry();
1493                 $data = $registry->readFromQueue( $queue );
1494                 $wgAutoloadClasses += $data['autoload'];
1495
1496                 $hooksWeWant = isset( $wgHooks['LoadExtensionSchemaUpdates'] ) ?
1497                         $wgHooks['LoadExtensionSchemaUpdates'] : array();
1498
1499                 if ( isset( $data['globals']['wgHooks']['LoadExtensionSchemaUpdates'] ) ) {
1500                         $hooksWeWant = array_merge_recursive(
1501                                 $hooksWeWant,
1502                                 $data['globals']['wgHooks']['LoadExtensionSchemaUpdates']
1503                         );
1504                 }
1505                 // Unset everyone else's hooks. Lord knows what someone might be doing
1506                 // in ParserFirstCallInit (see bug 27171)
1507                 $GLOBALS['wgHooks'] = array( 'LoadExtensionSchemaUpdates' => $hooksWeWant );
1508
1509                 return Status::newGood();
1510         }
1511
1512         /**
1513          * Get an array of install steps. Should always be in the format of
1514          * array(
1515          *   'name'     => 'someuniquename',
1516          *   'callback' => array( $obj, 'method' ),
1517          * )
1518          * There must be a config-install-$name message defined per step, which will
1519          * be shown on install.
1520          *
1521          * @param DatabaseInstaller $installer DatabaseInstaller so we can make callbacks
1522          * @return array
1523          */
1524         protected function getInstallSteps( DatabaseInstaller $installer ) {
1525                 $coreInstallSteps = array(
1526                         array( 'name' => 'database', 'callback' => array( $installer, 'setupDatabase' ) ),
1527                         array( 'name' => 'tables', 'callback' => array( $installer, 'createTables' ) ),
1528                         array( 'name' => 'interwiki', 'callback' => array( $installer, 'populateInterwikiTable' ) ),
1529                         array( 'name' => 'stats', 'callback' => array( $this, 'populateSiteStats' ) ),
1530                         array( 'name' => 'keys', 'callback' => array( $this, 'generateKeys' ) ),
1531                         array( 'name' => 'updates', 'callback' => array( $installer, 'insertUpdateKeys' ) ),
1532                         array( 'name' => 'sysop', 'callback' => array( $this, 'createSysop' ) ),
1533                         array( 'name' => 'mainpage', 'callback' => array( $this, 'createMainpage' ) ),
1534                 );
1535
1536                 // Build the array of install steps starting from the core install list,
1537                 // then adding any callbacks that wanted to attach after a given step
1538                 foreach ( $coreInstallSteps as $step ) {
1539                         $this->installSteps[] = $step;
1540                         if ( isset( $this->extraInstallSteps[$step['name']] ) ) {
1541                                 $this->installSteps = array_merge(
1542                                         $this->installSteps,
1543                                         $this->extraInstallSteps[$step['name']]
1544                                 );
1545                         }
1546                 }
1547
1548                 // Prepend any steps that want to be at the beginning
1549                 if ( isset( $this->extraInstallSteps['BEGINNING'] ) ) {
1550                         $this->installSteps = array_merge(
1551                                 $this->extraInstallSteps['BEGINNING'],
1552                                 $this->installSteps
1553                         );
1554                 }
1555
1556                 // Extensions should always go first, chance to tie into hooks and such
1557                 if ( count( $this->getVar( '_Extensions' ) ) ) {
1558                         array_unshift( $this->installSteps,
1559                                 array( 'name' => 'extensions', 'callback' => array( $this, 'includeExtensions' ) )
1560                         );
1561                         $this->installSteps[] = array(
1562                                 'name' => 'extension-tables',
1563                                 'callback' => array( $installer, 'createExtensionTables' )
1564                         );
1565                 }
1566
1567                 return $this->installSteps;
1568         }
1569
1570         /**
1571          * Actually perform the installation.
1572          *
1573          * @param callable $startCB A callback array for the beginning of each step
1574          * @param callable $endCB A callback array for the end of each step
1575          *
1576          * @return array Array of Status objects
1577          */
1578         public function performInstallation( $startCB, $endCB ) {
1579                 $installResults = array();
1580                 $installer = $this->getDBInstaller();
1581                 $installer->preInstall();
1582                 $steps = $this->getInstallSteps( $installer );
1583                 foreach ( $steps as $stepObj ) {
1584                         $name = $stepObj['name'];
1585                         call_user_func_array( $startCB, array( $name ) );
1586
1587                         // Perform the callback step
1588                         $status = call_user_func( $stepObj['callback'], $installer );
1589
1590                         // Output and save the results
1591                         call_user_func( $endCB, $name, $status );
1592                         $installResults[$name] = $status;
1593
1594                         // If we've hit some sort of fatal, we need to bail.
1595                         // Callback already had a chance to do output above.
1596                         if ( !$status->isOk() ) {
1597                                 break;
1598                         }
1599                 }
1600                 if ( $status->isOk() ) {
1601                         $this->setVar( '_InstallDone', true );
1602                 }
1603
1604                 return $installResults;
1605         }
1606
1607         /**
1608          * Generate $wgSecretKey. Will warn if we had to use an insecure random source.
1609          *
1610          * @return Status
1611          */
1612         public function generateKeys() {
1613                 $keys = array( 'wgSecretKey' => 64 );
1614                 if ( strval( $this->getVar( 'wgUpgradeKey' ) ) === '' ) {
1615                         $keys['wgUpgradeKey'] = 16;
1616                 }
1617
1618                 return $this->doGenerateKeys( $keys );
1619         }
1620
1621         /**
1622          * Generate a secret value for variables using our CryptRand generator.
1623          * Produce a warning if the random source was insecure.
1624          *
1625          * @param array $keys
1626          * @return Status
1627          */
1628         protected function doGenerateKeys( $keys ) {
1629                 $status = Status::newGood();
1630
1631                 $strong = true;
1632                 foreach ( $keys as $name => $length ) {
1633                         $secretKey = MWCryptRand::generateHex( $length, true );
1634                         if ( !MWCryptRand::wasStrong() ) {
1635                                 $strong = false;
1636                         }
1637
1638                         $this->setVar( $name, $secretKey );
1639                 }
1640
1641                 if ( !$strong ) {
1642                         $names = array_keys( $keys );
1643                         $names = preg_replace( '/^(.*)$/', '\$$1', $names );
1644                         global $wgLang;
1645                         $status->warning( 'config-insecure-keys', $wgLang->listToText( $names ), count( $names ) );
1646                 }
1647
1648                 return $status;
1649         }
1650
1651         /**
1652          * Create the first user account, grant it sysop and bureaucrat rights
1653          *
1654          * @return Status
1655          */
1656         protected function createSysop() {
1657                 $name = $this->getVar( '_AdminName' );
1658                 $user = User::newFromName( $name );
1659
1660                 if ( !$user ) {
1661                         // We should've validated this earlier anyway!
1662                         return Status::newFatal( 'config-admin-error-user', $name );
1663                 }
1664
1665                 if ( $user->idForName() == 0 ) {
1666                         $user->addToDatabase();
1667
1668                         try {
1669                                 $user->setPassword( $this->getVar( '_AdminPassword' ) );
1670                         } catch ( PasswordError $pwe ) {
1671                                 return Status::newFatal( 'config-admin-error-password', $name, $pwe->getMessage() );
1672                         }
1673
1674                         $user->addGroup( 'sysop' );
1675                         $user->addGroup( 'bureaucrat' );
1676                         if ( $this->getVar( '_AdminEmail' ) ) {
1677                                 $user->setEmail( $this->getVar( '_AdminEmail' ) );
1678                         }
1679                         $user->saveSettings();
1680
1681                         // Update user count
1682                         $ssUpdate = new SiteStatsUpdate( 0, 0, 0, 0, 1 );
1683                         $ssUpdate->doUpdate();
1684                 }
1685                 $status = Status::newGood();
1686
1687                 if ( $this->getVar( '_Subscribe' ) && $this->getVar( '_AdminEmail' ) ) {
1688                         $this->subscribeToMediaWikiAnnounce( $status );
1689                 }
1690
1691                 return $status;
1692         }
1693
1694         /**
1695          * @param Status $s
1696          */
1697         private function subscribeToMediaWikiAnnounce( Status $s ) {
1698                 $params = array(
1699                         'email' => $this->getVar( '_AdminEmail' ),
1700                         'language' => 'en',
1701                         'digest' => 0
1702                 );
1703
1704                 // Mailman doesn't support as many languages as we do, so check to make
1705                 // sure their selected language is available
1706                 $myLang = $this->getVar( '_UserLang' );
1707                 if ( in_array( $myLang, $this->mediaWikiAnnounceLanguages ) ) {
1708                         $myLang = $myLang == 'pt-br' ? 'pt_BR' : $myLang; // rewrite to Mailman's pt_BR
1709                         $params['language'] = $myLang;
1710                 }
1711
1712                 if ( MWHttpRequest::canMakeRequests() ) {
1713                         $res = MWHttpRequest::factory( $this->mediaWikiAnnounceUrl,
1714                                 array( 'method' => 'POST', 'postData' => $params ), __METHOD__ )->execute();
1715                         if ( !$res->isOK() ) {
1716                                 $s->warning( 'config-install-subscribe-fail', $res->getMessage() );
1717                         }
1718                 } else {
1719                         $s->warning( 'config-install-subscribe-notpossible' );
1720                 }
1721         }
1722
1723         /**
1724          * Insert Main Page with default content.
1725          *
1726          * @param DatabaseInstaller $installer
1727          * @return Status
1728          */
1729         protected function createMainpage( DatabaseInstaller $installer ) {
1730                 $status = Status::newGood();
1731                 try {
1732                         $page = WikiPage::factory( Title::newMainPage() );
1733                         $content = new WikitextContent(
1734                                 wfMessage( 'mainpagetext' )->inContentLanguage()->text() . "\n\n" .
1735                                 wfMessage( 'mainpagedocfooter' )->inContentLanguage()->text()
1736                         );
1737
1738                         $page->doEditContent( $content,
1739                                 '',
1740                                 EDIT_NEW,
1741                                 false,
1742                                 User::newFromName( 'MediaWiki default' )
1743                         );
1744                 } catch ( Exception $e ) {
1745                         //using raw, because $wgShowExceptionDetails can not be set yet
1746                         $status->fatal( 'config-install-mainpage-failed', $e->getMessage() );
1747                 }
1748
1749                 return $status;
1750         }
1751
1752         /**
1753          * Override the necessary bits of the config to run an installation.
1754          */
1755         public static function overrideConfig() {
1756                 define( 'MW_NO_SESSION', 1 );
1757
1758                 // Don't access the database
1759                 $GLOBALS['wgUseDatabaseMessages'] = false;
1760                 // Don't cache langconv tables
1761                 $GLOBALS['wgLanguageConverterCacheType'] = CACHE_NONE;
1762                 // Debug-friendly
1763                 $GLOBALS['wgShowExceptionDetails'] = true;
1764                 // Don't break forms
1765                 $GLOBALS['wgExternalLinkTarget'] = '_blank';
1766
1767                 // Extended debugging
1768                 $GLOBALS['wgShowSQLErrors'] = true;
1769                 $GLOBALS['wgShowDBErrorBacktrace'] = true;
1770
1771                 // Allow multiple ob_flush() calls
1772                 $GLOBALS['wgDisableOutputCompression'] = true;
1773
1774                 // Use a sensible cookie prefix (not my_wiki)
1775                 $GLOBALS['wgCookiePrefix'] = 'mw_installer';
1776
1777                 // Some of the environment checks make shell requests, remove limits
1778                 $GLOBALS['wgMaxShellMemory'] = 0;
1779         }
1780
1781         /**
1782          * Add an installation step following the given step.
1783          *
1784          * @param callable $callback A valid installation callback array, in this form:
1785          *    array( 'name' => 'some-unique-name', 'callback' => array( $obj, 'function' ) );
1786          * @param string $findStep The step to find. Omit to put the step at the beginning
1787          */
1788         public function addInstallStep( $callback, $findStep = 'BEGINNING' ) {
1789                 $this->extraInstallSteps[$findStep][] = $callback;
1790         }
1791
1792         /**
1793          * Disable the time limit for execution.
1794          * Some long-running pages (Install, Upgrade) will want to do this
1795          */
1796         protected function disableTimeLimit() {
1797                 MediaWiki\suppressWarnings();
1798                 set_time_limit( 0 );
1799                 MediaWiki\restoreWarnings();
1800         }
1801 }