includes/installer/Installer.php

   1 <?php
   2 /**
   3  * Base code for MediaWiki installer.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  * http://www.gnu.org/copyleft/gpl.html
  19  *
  20  * @file
  21  * @ingroup Deployment
  22  */
  23
  24 /**
  25  * This documentation group collects source code files with deployment functionality.
  26  *
  27  * @defgroup Deployment Deployment
  28  */
  29
  30 /**
  31  * Base installer class.
  32  *
  33  * This class provides the base for installation and update functionality
  34  * for both MediaWiki core and extensions.
  35  *
  36  * @ingroup Deployment
  37  * @since 1.17
  38  */
  39 abstract class Installer {
  40
  41         /**
  42          * The oldest version of PCRE we can support.
  43          *
  44          * Defining this is necessary because PHP may be linked with a system version
  45          * of PCRE, which may be older than that bundled with the minimum PHP version.
  46          */
  47         const MINIMUM_PCRE_VERSION = '7.2';
  48
  49         /**
  50          * @var array
  51          */
  52         protected $settings;
  53
  54         /**
  55          * List of detected DBs, access using getCompiledDBs().
  56          *
  57          * @var array
  58          */
  59         protected $compiledDBs;
  60
  61         /**
  62          * Cached DB installer instances, access using getDBInstaller().
  63          *
  64          * @var array
  65          */
  66         protected $dbInstallers = array();
  67
  68         /**
  69          * Minimum memory size in MB.
  70          *
  71          * @var int
  72          */
  73         protected $minMemorySize = 50;
  74
  75         /**
  76          * Cached Title, used by parse().
  77          *
  78          * @var Title
  79          */
  80         protected $parserTitle;
  81
  82         /**
  83          * Cached ParserOptions, used by parse().
  84          *
  85          * @var ParserOptions
  86          */
  87         protected $parserOptions;
  88
  89         /**
  90          * Known database types. These correspond to the class names <type>Installer,
  91          * and are also MediaWiki database types valid for $wgDBtype.
  92          *
  93          * To add a new type, create a <type>Installer class and a Database<type>
  94          * class, and add a config-type-<type> message to MessagesEn.php.
  95          *
  96          * @var array
  97          */
  98         protected static $dbTypes = array(
  99                 'mysql',
 100                 'postgres',
 101                 'oracle',
 102                 'mssql',
 103                 'sqlite',
 104         );
 105
 106         /**
 107          * A list of environment check methods called by doEnvironmentChecks().
 108          * These may output warnings using showMessage(), and/or abort the
 109          * installation process by returning false.
 110          *
 111          * For the WebInstaller these are only called on the Welcome page,
 112          * if these methods have side-effects that should affect later page loads
 113          * (as well as the generated stylesheet), use envPreps instead.
 114          *
 115          * @var array
 116          */
 117         protected $envChecks = array(
 118                 'envCheckDB',
 119                 'envCheckRegisterGlobals',
 120                 'envCheckBrokenXML',
 121                 'envCheckMagicQuotes',
 122                 'envCheckMbstring',
 123                 'envCheckSafeMode',
 124                 'envCheckXML',
 125                 'envCheckPCRE',
 126                 'envCheckMemory',
 127                 'envCheckCache',
 128                 'envCheckModSecurity',
 129                 'envCheckDiff3',
 130                 'envCheckGraphics',
 131                 'envCheckGit',
 132                 'envCheckServer',
 133                 'envCheckPath',
 134                 'envCheckShellLocale',
 135                 'envCheckUploadsDirectory',
 136                 'envCheckLibicu',
 137                 'envCheckSuhosinMaxValueLength',
 138                 'envCheckCtype',
 139                 'envCheckIconv',
 140                 'envCheckJSON',
 141         );
 142
 143         /**
 144          * A list of environment preparation methods called by doEnvironmentPreps().
 145          *
 146          * @var array
 147          */
 148         protected $envPreps = array(
 149                 'envPrepExtension',
 150                 'envPrepServer',
 151                 'envPrepPath',
 152         );
 153
 154         /**
 155          * MediaWiki configuration globals that will eventually be passed through
 156          * to LocalSettings.php. The names only are given here, the defaults
 157          * typically come from DefaultSettings.php.
 158          *
 159          * @var array
 160          */
 161         protected $defaultVarNames = array(
 162                 'wgSitename',
 163                 'wgPasswordSender',
 164                 'wgLanguageCode',
 165                 'wgRightsIcon',
 166                 'wgRightsText',
 167                 'wgRightsUrl',
 168                 'wgMainCacheType',
 169                 'wgEnableEmail',
 170                 'wgEnableUserEmail',
 171                 'wgEnotifUserTalk',
 172                 'wgEnotifWatchlist',
 173                 'wgEmailAuthentication',
 174                 'wgDBtype',
 175                 'wgDiff3',
 176                 'wgImageMagickConvertCommand',
 177                 'wgGitBin',
 178                 'IP',
 179                 'wgScriptPath',
 180                 'wgScriptExtension',
 181                 'wgMetaNamespace',
 182                 'wgDeletedDirectory',
 183                 'wgEnableUploads',
 184                 'wgShellLocale',
 185                 'wgSecretKey',
 186                 'wgUseInstantCommons',
 187                 'wgUpgradeKey',
 188                 'wgDefaultSkin',
 189                 'wgResourceLoaderMaxQueryLength',
 190         );
 191
 192         /**
 193          * Variables that are stored alongside globals, and are used for any
 194          * configuration of the installation process aside from the MediaWiki
 195          * configuration. Map of names to defaults.
 196          *
 197          * @var array
 198          */
 199         protected $internalDefaults = array(
 200                 '_UserLang' => 'en',
 201                 '_Environment' => false,
 202                 '_SafeMode' => false,
 203                 '_RaiseMemory' => false,
 204                 '_UpgradeDone' => false,
 205                 '_InstallDone' => false,
 206                 '_Caches' => array(),
 207                 '_InstallPassword' => '',
 208                 '_SameAccount' => true,
 209                 '_CreateDBAccount' => false,
 210                 '_NamespaceType' => 'site-name',
 211                 '_AdminName' => '', // will be set later, when the user selects language
 212                 '_AdminPassword' => '',
 213                 '_AdminPasswordConfirm' => '',
 214                 '_AdminEmail' => '',
 215                 '_Subscribe' => false,
 216                 '_SkipOptional' => 'continue',
 217                 '_RightsProfile' => 'wiki',
 218                 '_LicenseCode' => 'none',
 219                 '_CCDone' => false,
 220                 '_Extensions' => array(),
 221                 '_Skins' => array(),
 222                 '_MemCachedServers' => '',
 223                 '_UpgradeKeySupplied' => false,
 224                 '_ExistingDBSettings' => false,
 225
 226                 // $wgLogo is probably wrong (bug 48084); set something that will work.
 227                 // Single quotes work fine here, as LocalSettingsGenerator outputs this unescaped.
 228                 'wgLogo' => '$wgStylePath/common/images/wiki.png',
 229         );
 230
 231         /**
 232          * The actual list of installation steps. This will be initialized by getInstallSteps()
 233          *
 234          * @var array
 235          */
 236         private $installSteps = array();
 237
 238         /**
 239          * Extra steps for installation, for things like DatabaseInstallers to modify
 240          *
 241          * @var array
 242          */
 243         protected $extraInstallSteps = array();
 244
 245         /**
 246          * Known object cache types and the functions used to test for their existence.
 247          *
 248          * @var array
 249          */
 250         protected $objectCaches = array(
 251                 'xcache' => 'xcache_get',
 252                 'apc' => 'apc_fetch',
 253                 'wincache' => 'wincache_ucache_get'
 254         );
 255
 256         /**
 257          * User rights profiles.
 258          *
 259          * @var array
 260          */
 261         public $rightsProfiles = array(
 262                 'wiki' => array(),
 263                 'no-anon' => array(
 264                         '*' => array( 'edit' => false )
 265                 ),
 266                 'fishbowl' => array(
 267                         '*' => array(
 268                                 'createaccount' => false,
 269                                 'edit' => false,
 270                         ),
 271                 ),
 272                 'private' => array(
 273                         '*' => array(
 274                                 'createaccount' => false,
 275                                 'edit' => false,
 276                                 'read' => false,
 277                         ),
 278                 ),
 279         );
 280
 281         /**
 282          * License types.
 283          *
 284          * @var array
 285          */
 286         public $licenses = array(
 287                 'cc-by' => array(
 288                         'url' => 'http://creativecommons.org/licenses/by/3.0/',
 289                         'icon' => '{$wgStylePath}/common/images/cc-by.png',
 290                 ),
 291                 'cc-by-sa' => array(
 292                         'url' => 'http://creativecommons.org/licenses/by-sa/3.0/',
 293                         'icon' => '{$wgStylePath}/common/images/cc-by-sa.png',
 294                 ),
 295                 'cc-by-nc-sa' => array(
 296                         'url' => 'http://creativecommons.org/licenses/by-nc-sa/3.0/',
 297                         'icon' => '{$wgStylePath}/common/images/cc-by-nc-sa.png',
 298                 ),
 299                 'cc-0' => array(
 300                         'url' => 'https://creativecommons.org/publicdomain/zero/1.0/',
 301                         'icon' => '{$wgStylePath}/common/images/cc-0.png',
 302                 ),
 303                 'pd' => array(
 304                         'url' => '',
 305                         'icon' => '{$wgStylePath}/common/images/public-domain.png',
 306                 ),
 307                 'gfdl' => array(
 308                         'url' => 'http://www.gnu.org/copyleft/fdl.html',
 309                         'icon' => '{$wgStylePath}/common/images/gnu-fdl.png',
 310                 ),
 311                 'none' => array(
 312                         'url' => '',
 313                         'icon' => '',
 314                         'text' => ''
 315                 ),
 316                 'cc-choose' => array(
 317                         // Details will be filled in by the selector.
 318                         'url' => '',
 319                         'icon' => '',
 320                         'text' => '',
 321                 ),
 322         );
 323
 324         /**
 325          * URL to mediawiki-announce subscription
 326          */
 327         protected $mediaWikiAnnounceUrl =
 328                 'https://lists.wikimedia.org/mailman/subscribe/mediawiki-announce';
 329
 330         /**
 331          * Supported language codes for Mailman
 332          */
 333         protected $mediaWikiAnnounceLanguages = array(
 334                 'ca', 'cs', 'da', 'de', 'en', 'es', 'et', 'eu', 'fi', 'fr', 'hr', 'hu',
 335                 'it', 'ja', 'ko', 'lt', 'nl', 'no', 'pl', 'pt', 'pt-br', 'ro', 'ru',
 336                 'sl', 'sr', 'sv', 'tr', 'uk'
 337         );
 338
 339         /**
 340          * UI interface for displaying a short message
 341          * The parameters are like parameters to wfMessage().
 342          * The messages will be in wikitext format, which will be converted to an
 343          * output format such as HTML or text before being sent to the user.
 344          * @param string $msg
 345          */
 346         abstract public function showMessage( $msg /*, ... */ );
 347
 348         /**
 349          * Same as showMessage(), but for displaying errors
 350          * @param string $msg
 351          */
 352         abstract public function showError( $msg /*, ... */ );
 353
 354         /**
 355          * Show a message to the installing user by using a Status object
 356          * @param Status $status
 357          */
 358         abstract public function showStatusMessage( Status $status );
 359
 360         /**
 361          * Constructor, always call this from child classes.
 362          */
 363         public function __construct() {
 364                 global $wgMessagesDirs, $wgUser;
 365
 366                 // Disable the i18n cache
 367                 Language::getLocalisationCache()->disableBackend();
 368                 // Disable LoadBalancer and wfGetDB etc.
 369                 LBFactory::disableBackend();
 370
 371                 // Disable object cache (otherwise CACHE_ANYTHING will try CACHE_DB and
 372                 // SqlBagOStuff will then throw since we just disabled wfGetDB)
 373                 $GLOBALS['wgMemc'] = new EmptyBagOStuff;
 374                 ObjectCache::clear();
 375                 $emptyCache = array( 'class' => 'EmptyBagOStuff' );
 376                 $GLOBALS['wgObjectCaches'] = array(
 377                         CACHE_NONE => $emptyCache,
 378                         CACHE_DB => $emptyCache,
 379                         CACHE_ANYTHING => $emptyCache,
 380                         CACHE_MEMCACHED => $emptyCache,
 381                 );
 382
 383                 // Load the installer's i18n.
 384                 $wgMessagesDirs['MediawikiInstaller'] = __DIR__ . '/i18n';
 385
 386                 // Having a user with id = 0 safeguards us from DB access via User::loadOptions().
 387                 $wgUser = User::newFromId( 0 );
 388
 389                 $this->settings = $this->internalDefaults;
 390
 391                 foreach ( $this->defaultVarNames as $var ) {
 392                         $this->settings[$var] = $GLOBALS[$var];
 393                 }
 394
 395                 $this->doEnvironmentPreps();
 396
 397                 $this->compiledDBs = array();
 398                 foreach ( self::getDBTypes() as $type ) {
 399                         $installer = $this->getDBInstaller( $type );
 400
 401                         if ( !$installer->isCompiled() ) {
 402                                 continue;
 403                         }
 404                         $this->compiledDBs[] = $type;
 405                 }
 406
 407                 $this->parserTitle = Title::newFromText( 'Installer' );
 408                 $this->parserOptions = new ParserOptions; // language will be wrong :(
 409                 $this->parserOptions->setEditSection( false );
 410         }
 411
 412         /**
 413          * Get a list of known DB types.
 414          *
 415          * @return array
 416          */
 417         public static function getDBTypes() {
 418                 return self::$dbTypes;
 419         }
 420
 421         /**
 422          * Do initial checks of the PHP environment. Set variables according to
 423          * the observed environment.
 424          *
 425          * It's possible that this may be called under the CLI SAPI, not the SAPI
 426          * that the wiki will primarily run under. In that case, the subclass should
 427          * initialise variables such as wgScriptPath, before calling this function.
 428          *
 429          * Under the web subclass, it can already be assumed that PHP 5+ is in use
 430          * and that sessions are working.
 431          *
 432          * @return Status
 433          */
 434         public function doEnvironmentChecks() {
 435                 // Php version has already been checked by entry scripts
 436                 // Show message here for information purposes
 437                 $this->showMessage( 'config-env-php', PHP_VERSION );
 438
 439                 $good = true;
 440                 // Must go here because an old version of PCRE can prevent other checks from completing
 441                 list( $pcreVersion ) = explode( ' ', PCRE_VERSION, 2 );
 442                 if ( version_compare( $pcreVersion, self::MINIMUM_PCRE_VERSION, '<' ) ) {
 443                         $this->showError( 'config-pcre-old', self::MINIMUM_PCRE_VERSION, $pcreVersion );
 444                         $good = false;
 445                 } else {
 446                         foreach ( $this->envChecks as $check ) {
 447                                 $status = $this->$check();
 448                                 if ( $status === false ) {
 449                                         $good = false;
 450                                 }
 451                         }
 452                 }
 453
 454                 $this->setVar( '_Environment', $good );
 455
 456                 return $good ? Status::newGood() : Status::newFatal( 'config-env-bad' );
 457         }
 458
 459         public function doEnvironmentPreps() {
 460                 foreach ( $this->envPreps as $prep ) {
 461                         $this->$prep();
 462                 }
 463         }
 464
 465         /**
 466          * Set a MW configuration variable, or internal installer configuration variable.
 467          *
 468          * @param string $name
 469          * @param mixed $value
 470          */
 471         public function setVar( $name, $value ) {
 472                 $this->settings[$name] = $value;
 473         }
 474
 475         /**
 476          * Get an MW configuration variable, or internal installer configuration variable.
 477          * The defaults come from $GLOBALS (ultimately DefaultSettings.php).
 478          * Installer variables are typically prefixed by an underscore.
 479          *
 480          * @param string $name
 481          * @param mixed $default
 482          *
 483          * @return mixed
 484          */
 485         public function getVar( $name, $default = null ) {
 486                 if ( !isset( $this->settings[$name] ) ) {
 487                         return $default;
 488                 } else {
 489                         return $this->settings[$name];
 490                 }
 491         }
 492
 493         /**
 494          * Get a list of DBs supported by current PHP setup
 495          *
 496          * @return array
 497          */
 498         public function getCompiledDBs() {
 499                 return $this->compiledDBs;
 500         }
 501
 502         /**
 503          * Get an instance of DatabaseInstaller for the specified DB type.
 504          *
 505          * @param mixed $type DB installer for which is needed, false to use default.
 506          *
 507          * @return DatabaseInstaller
 508          */
 509         public function getDBInstaller( $type = false ) {
 510                 if ( !$type ) {
 511                         $type = $this->getVar( 'wgDBtype' );
 512                 }
 513
 514                 $type = strtolower( $type );
 515
 516                 if ( !isset( $this->dbInstallers[$type] ) ) {
 517                         $class = ucfirst( $type ) . 'Installer';
 518                         $this->dbInstallers[$type] = new $class( $this );
 519                 }
 520
 521                 return $this->dbInstallers[$type];
 522         }
 523
 524         /**
 525          * Determine if LocalSettings.php exists. If it does, return its variables.
 526          *
 527          * @return array
 528          */
 529         public static function getExistingLocalSettings() {
 530                 global $IP;
 531
 532                 // You might be wondering why this is here. Well if you don't do this
 533                 // then some poorly-formed extensions try to call their own classes
 534                 // after immediately registering them. We really need to get extension
 535                 // registration out of the global scope and into a real format.
 536                 // @see https://bugzilla.wikimedia.org/67440
 537                 global $wgAutoloadClasses;
 538
 539                 wfSuppressWarnings();
 540                 $_lsExists = file_exists( "$IP/LocalSettings.php" );
 541                 wfRestoreWarnings();
 542
 543                 if ( !$_lsExists ) {
 544                         return false;
 545                 }
 546                 unset( $_lsExists );
 547
 548                 require "$IP/includes/DefaultSettings.php";
 549                 require "$IP/LocalSettings.php";
 550
 551                 return get_defined_vars();
 552         }
 553
 554         /**
 555          * Get a fake password for sending back to the user in HTML.
 556          * This is a security mechanism to avoid compromise of the password in the
 557          * event of session ID compromise.
 558          *
 559          * @param string $realPassword
 560          *
 561          * @return string
 562          */
 563         public function getFakePassword( $realPassword ) {
 564                 return str_repeat( '*', strlen( $realPassword ) );
 565         }
 566
 567         /**
 568          * Set a variable which stores a password, except if the new value is a
 569          * fake password in which case leave it as it is.
 570          *
 571          * @param string $name
 572          * @param mixed $value
 573          */
 574         public function setPassword( $name, $value ) {
 575                 if ( !preg_match( '/^\*+$/', $value ) ) {
 576                         $this->setVar( $name, $value );
 577                 }
 578         }
 579
 580         /**
 581          * On POSIX systems return the primary group of the webserver we're running under.
 582          * On other systems just returns null.
 583          *
 584          * This is used to advice the user that he should chgrp his mw-config/data/images directory as the
 585          * webserver user before he can install.
 586          *
 587          * Public because SqliteInstaller needs it, and doesn't subclass Installer.
 588          *
 589          * @return mixed
 590          */
 591         public static function maybeGetWebserverPrimaryGroup() {
 592                 if ( !function_exists( 'posix_getegid' ) || !function_exists( 'posix_getpwuid' ) ) {
 593                         # I don't know this, this isn't UNIX.
 594                         return null;
 595                 }
 596
 597                 # posix_getegid() *not* getmygid() because we want the group of the webserver,
 598                 # not whoever owns the current script.
 599                 $gid = posix_getegid();
 600                 $getpwuid = posix_getpwuid( $gid );
 601                 $group = $getpwuid['name'];
 602
 603                 return $group;
 604         }
 605
 606         /**
 607          * Convert wikitext $text to HTML.
 608          *
 609          * This is potentially error prone since many parser features require a complete
 610          * installed MW database. The solution is to just not use those features when you
 611          * write your messages. This appears to work well enough. Basic formatting and
 612          * external links work just fine.
 613          *
 614          * But in case a translator decides to throw in a "#ifexist" or internal link or
 615          * whatever, this function is guarded to catch the attempted DB access and to present
 616          * some fallback text.
 617          *
 618          * @param string $text
 619          * @param bool $lineStart
 620          * @return string
 621          */
 622         public function parse( $text, $lineStart = false ) {
 623                 global $wgParser;
 624
 625                 try {
 626                         $out = $wgParser->parse( $text, $this->parserTitle, $this->parserOptions, $lineStart );
 627                         $html = $out->getText();
 628                 } catch ( DBAccessError $e ) {
 629                         $html = '<!--DB access attempted during parse-->  ' . htmlspecialchars( $text );
 630
 631                         if ( !empty( $this->debug ) ) {
 632                                 $html .= "<!--\n" . $e->getTraceAsString() . "\n-->";
 633                         }
 634                 }
 635
 636                 return $html;
 637         }
 638
 639         /**
 640          * @return ParserOptions
 641          */
 642         public function getParserOptions() {
 643                 return $this->parserOptions;
 644         }
 645
 646         public function disableLinkPopups() {
 647                 $this->parserOptions->setExternalLinkTarget( false );
 648         }
 649
 650         public function restoreLinkPopups() {
 651                 global $wgExternalLinkTarget;
 652                 $this->parserOptions->setExternalLinkTarget( $wgExternalLinkTarget );
 653         }
 654
 655         /**
 656          * Install step which adds a row to the site_stats table with appropriate
 657          * initial values.
 658          *
 659          * @param DatabaseInstaller $installer
 660          *
 661          * @return Status
 662          */
 663         public function populateSiteStats( DatabaseInstaller $installer ) {
 664                 $status = $installer->getConnection();
 665                 if ( !$status->isOK() ) {
 666                         return $status;
 667                 }
 668                 $status->value->insert(
 669                         'site_stats',
 670                         array(
 671                                 'ss_row_id' => 1,
 672                                 'ss_total_views' => 0,
 673                                 'ss_total_edits' => 0,
 674                                 'ss_good_articles' => 0,
 675                                 'ss_total_pages' => 0,
 676                                 'ss_users' => 0,
 677                                 'ss_images' => 0
 678                         ),
 679                         __METHOD__, 'IGNORE'
 680                 );
 681
 682                 return Status::newGood();
 683         }
 684
 685         /**
 686          * Exports all wg* variables stored by the installer into global scope.
 687          */
 688         public function exportVars() {
 689                 foreach ( $this->settings as $name => $value ) {
 690                         if ( substr( $name, 0, 2 ) == 'wg' ) {
 691                                 $GLOBALS[$name] = $value;
 692                         }
 693                 }
 694         }
 695
 696         /**
 697          * Environment check for DB types.
 698          * @return bool
 699          */
 700         protected function envCheckDB() {
 701                 global $wgLang;
 702
 703                 $allNames = array();
 704
 705                 // Messages: config-type-mysql, config-type-postgres, config-type-oracle,
 706                 // config-type-sqlite
 707                 foreach ( self::getDBTypes() as $name ) {
 708                         $allNames[] = wfMessage( "config-type-$name" )->text();
 709                 }
 710
 711                 $databases = $this->getCompiledDBs();
 712
 713                 $databases = array_flip( $databases );
 714                 foreach ( array_keys( $databases ) as $db ) {
 715                         $installer = $this->getDBInstaller( $db );
 716                         $status = $installer->checkPrerequisites();
 717                         if ( !$status->isGood() ) {
 718                                 $this->showStatusMessage( $status );
 719                         }
 720                         if ( !$status->isOK() ) {
 721                                 unset( $databases[$db] );
 722                         }
 723                 }
 724                 $databases = array_flip( $databases );
 725                 if ( !$databases ) {
 726                         $this->showError( 'config-no-db', $wgLang->commaList( $allNames ) );
 727
 728                         // @todo FIXME: This only works for the web installer!
 729                         return false;
 730                 }
 731
 732                 return true;
 733         }
 734
 735         /**
 736          * Environment check for register_globals.
 737          * Prevent installation if enabled
 738          */
 739         protected function envCheckRegisterGlobals() {
 740                 if ( wfIniGetBool( 'register_globals' ) ) {
 741                         $this->showMessage( 'config-register-globals-error' );
 742                         return false;
 743                 }
 744
 745                 return true;
 746         }
 747
 748         /**
 749          * Some versions of libxml+PHP break < and > encoding horribly
 750          * @return bool
 751          */
 752         protected function envCheckBrokenXML() {
 753                 $test = new PhpXmlBugTester();
 754                 if ( !$test->ok ) {
 755                         $this->showError( 'config-brokenlibxml' );
 756
 757                         return false;
 758                 }
 759
 760                 return true;
 761         }
 762
 763         /**
 764          * Environment check for magic_quotes_(gpc|runtime|sybase).
 765          * @return bool
 766          */
 767         protected function envCheckMagicQuotes() {
 768                 $status = true;
 769                 foreach ( array( 'gpc', 'runtime', 'sybase' ) as $magicJunk ) {
 770                         if ( wfIniGetBool( "magic_quotes_$magicJunk" ) ) {
 771                                 $this->showError( "config-magic-quotes-$magicJunk" );
 772                                 $status = false;
 773                         }
 774                 }
 775
 776                 return $status;
 777         }
 778
 779         /**
 780          * Environment check for mbstring.func_overload.
 781          * @return bool
 782          */
 783         protected function envCheckMbstring() {
 784                 if ( wfIniGetBool( 'mbstring.func_overload' ) ) {
 785                         $this->showError( 'config-mbstring' );
 786
 787                         return false;
 788                 }
 789
 790                 return true;
 791         }
 792
 793         /**
 794          * Environment check for safe_mode.
 795          * @return bool
 796          */
 797         protected function envCheckSafeMode() {
 798                 if ( wfIniGetBool( 'safe_mode' ) ) {
 799                         $this->setVar( '_SafeMode', true );
 800                         $this->showMessage( 'config-safe-mode' );
 801                 }
 802
 803                 return true;
 804         }
 805
 806         /**
 807          * Environment check for the XML module.
 808          * @return bool
 809          */
 810         protected function envCheckXML() {
 811                 if ( !function_exists( "utf8_encode" ) ) {
 812                         $this->showError( 'config-xml-bad' );
 813
 814                         return false;
 815                 }
 816
 817                 return true;
 818         }
 819
 820         /**
 821          * Environment check for the PCRE module.
 822          *
 823          * @note If this check were to fail, the parser would
 824          *   probably throw an exception before the result
 825          *   of this check is shown to the user.
 826          * @return bool
 827          */
 828         protected function envCheckPCRE() {
 829                 wfSuppressWarnings();
 830                 $regexd = preg_replace( '/[\x{0430}-\x{04FF}]/iu', '', '-АБВГД-' );
 831                 // Need to check for \p support too, as PCRE can be compiled
 832                 // with utf8 support, but not unicode property support.
 833                 // check that \p{Zs} (space separators) matches
 834                 // U+3000 (Ideographic space)
 835                 $regexprop = preg_replace( '/\p{Zs}/u', '', "-\xE3\x80\x80-" );
 836                 wfRestoreWarnings();
 837                 if ( $regexd != '--' || $regexprop != '--' ) {
 838                         $this->showError( 'config-pcre-no-utf8' );
 839
 840                         return false;
 841                 }
 842
 843                 return true;
 844         }
 845
 846         /**
 847          * Environment check for available memory.
 848          * @return bool
 849          */
 850         protected function envCheckMemory() {
 851                 $limit = ini_get( 'memory_limit' );
 852
 853                 if ( !$limit || $limit == -1 ) {
 854                         return true;
 855                 }
 856
 857                 $n = wfShorthandToInteger( $limit );
 858
 859                 if ( $n < $this->minMemorySize * 1024 * 1024 ) {
 860                         $newLimit = "{$this->minMemorySize}M";
 861
 862                         if ( ini_set( "memory_limit", $newLimit ) === false ) {
 863                                 $this->showMessage( 'config-memory-bad', $limit );
 864                         } else {
 865                                 $this->showMessage( 'config-memory-raised', $limit, $newLimit );
 866                                 $this->setVar( '_RaiseMemory', true );
 867                         }
 868                 }
 869
 870                 return true;
 871         }
 872
 873         /**
 874          * Environment check for compiled object cache types.
 875          */
 876         protected function envCheckCache() {
 877                 $caches = array();
 878                 foreach ( $this->objectCaches as $name => $function ) {
 879                         if ( function_exists( $function ) ) {
 880                                 if ( $name == 'xcache' && !wfIniGetBool( 'xcache.var_size' ) ) {
 881                                         continue;
 882                                 }
 883                                 $caches[$name] = true;
 884                         }
 885                 }
 886
 887                 if ( !$caches ) {
 888                         $this->showMessage( 'config-no-cache' );
 889                 }
 890
 891                 $this->setVar( '_Caches', $caches );
 892         }
 893
 894         /**
 895          * Scare user to death if they have mod_security
 896          * @return bool
 897          */
 898         protected function envCheckModSecurity() {
 899                 if ( self::apacheModulePresent( 'mod_security' ) ) {
 900                         $this->showMessage( 'config-mod-security' );
 901                 }
 902
 903                 return true;
 904         }
 905
 906         /**
 907          * Search for GNU diff3.
 908          * @return bool
 909          */
 910         protected function envCheckDiff3() {
 911                 $names = array( "gdiff3", "diff3", "diff3.exe" );
 912                 $versionInfo = array( '$1 --version 2>&1', 'GNU diffutils' );
 913
 914                 $diff3 = self::locateExecutableInDefaultPaths( $names, $versionInfo );
 915
 916                 if ( $diff3 ) {
 917                         $this->setVar( 'wgDiff3', $diff3 );
 918                 } else {
 919                         $this->setVar( 'wgDiff3', false );
 920                         $this->showMessage( 'config-diff3-bad' );
 921                 }
 922
 923                 return true;
 924         }
 925
 926         /**
 927          * Environment check for ImageMagick and GD.
 928          * @return bool
 929          */
 930         protected function envCheckGraphics() {
 931                 $names = array( wfIsWindows() ? 'convert.exe' : 'convert' );
 932                 $versionInfo = array( '$1 -version', 'ImageMagick' );
 933                 $convert = self::locateExecutableInDefaultPaths( $names, $versionInfo );
 934
 935                 $this->setVar( 'wgImageMagickConvertCommand', '' );
 936                 if ( $convert ) {
 937                         $this->setVar( 'wgImageMagickConvertCommand', $convert );
 938                         $this->showMessage( 'config-imagemagick', $convert );
 939
 940                         return true;
 941                 } elseif ( function_exists( 'imagejpeg' ) ) {
 942                         $this->showMessage( 'config-gd' );
 943                 } else {
 944                         $this->showMessage( 'config-no-scaling' );
 945                 }
 946
 947                 return true;
 948         }
 949
 950         /**
 951          * Search for git.
 952          *
 953          * @since 1.22
 954          * @return bool
 955          */
 956         protected function envCheckGit() {
 957                 $names = array( wfIsWindows() ? 'git.exe' : 'git' );
 958                 $versionInfo = array( '$1 --version', 'git version' );
 959
 960                 $git = self::locateExecutableInDefaultPaths( $names, $versionInfo );
 961
 962                 if ( $git ) {
 963                         $this->setVar( 'wgGitBin', $git );
 964                         $this->showMessage( 'config-git', $git );
 965                 } else {
 966                         $this->setVar( 'wgGitBin', false );
 967                         $this->showMessage( 'config-git-bad' );
 968                 }
 969
 970                 return true;
 971         }
 972
 973         /**
 974          * Environment check to inform user which server we've assumed.
 975          *
 976          * @return bool
 977          */
 978         protected function envCheckServer() {
 979                 $server = $this->envGetDefaultServer();
 980                 if ( $server !== null ) {
 981                         $this->showMessage( 'config-using-server', $server );
 982                 }
 983                 return true;
 984         }
 985
 986         /**
 987          * Environment check to inform user which paths we've assumed.
 988          *
 989          * @return bool
 990          */
 991         protected function envCheckPath() {
 992                 $this->showMessage(
 993                         'config-using-uri',
 994                         $this->getVar( 'wgServer' ),
 995                         $this->getVar( 'wgScriptPath' )
 996                 );
 997                 return true;
 998         }
 999
1000         /**
1001          * Environment check for preferred locale in shell
1002          * @return bool
1003          */
1004         protected function envCheckShellLocale() {
1005                 $os = php_uname( 's' );
1006                 $supported = array( 'Linux', 'SunOS', 'HP-UX', 'Darwin' ); # Tested these
1007
1008                 if ( !in_array( $os, $supported ) ) {
1009                         return true;
1010                 }
1011
1012                 # Get a list of available locales.
1013                 $ret = false;
1014                 $lines = wfShellExec( '/usr/bin/locale -a', $ret );
1015
1016                 if ( $ret ) {
1017                         return true;
1018                 }
1019
1020                 $lines = array_map( 'trim', explode( "\n", $lines ) );
1021                 $candidatesByLocale = array();
1022                 $candidatesByLang = array();
1023
1024                 foreach ( $lines as $line ) {
1025                         if ( $line === '' ) {
1026                                 continue;
1027                         }
1028
1029                         if ( !preg_match( '/^([a-zA-Z]+)(_[a-zA-Z]+|)\.(utf8|UTF-8)(@[a-zA-Z_]*|)$/i', $line, $m ) ) {
1030                                 continue;
1031                         }
1032
1033                         list( , $lang, , , ) = $m;
1034
1035                         $candidatesByLocale[$m[0]] = $m;
1036                         $candidatesByLang[$lang][] = $m;
1037                 }
1038
1039                 # Try the current value of LANG.
1040                 if ( isset( $candidatesByLocale[getenv( 'LANG' )] ) ) {
1041                         $this->setVar( 'wgShellLocale', getenv( 'LANG' ) );
1042
1043                         return true;
1044                 }
1045
1046                 # Try the most common ones.
1047                 $commonLocales = array( 'en_US.UTF-8', 'en_US.utf8', 'de_DE.UTF-8', 'de_DE.utf8' );
1048                 foreach ( $commonLocales as $commonLocale ) {
1049                         if ( isset( $candidatesByLocale[$commonLocale] ) ) {
1050                                 $this->setVar( 'wgShellLocale', $commonLocale );
1051
1052                                 return true;
1053                         }
1054                 }
1055
1056                 # Is there an available locale in the Wiki's language?
1057                 $wikiLang = $this->getVar( 'wgLanguageCode' );
1058
1059                 if ( isset( $candidatesByLang[$wikiLang] ) ) {
1060                         $m = reset( $candidatesByLang[$wikiLang] );
1061                         $this->setVar( 'wgShellLocale', $m[0] );
1062
1063                         return true;
1064                 }
1065
1066                 # Are there any at all?
1067                 if ( count( $candidatesByLocale ) ) {
1068                         $m = reset( $candidatesByLocale );
1069                         $this->setVar( 'wgShellLocale', $m[0] );
1070
1071                         return true;
1072                 }
1073
1074                 # Give up.
1075                 return true;
1076         }
1077
1078         /**
1079          * Environment check for the permissions of the uploads directory
1080          * @return bool
1081          */
1082         protected function envCheckUploadsDirectory() {
1083                 global $IP;
1084
1085                 $dir = $IP . '/images/';
1086                 $url = $this->getVar( 'wgServer' ) . $this->getVar( 'wgScriptPath' ) . '/images/';
1087                 $safe = !$this->dirIsExecutable( $dir, $url );
1088
1089                 if ( !$safe ) {
1090                         $this->showMessage( 'config-uploads-not-safe', $dir );
1091                 }
1092
1093                 return true;
1094         }
1095
1096         /**
1097          * Checks if suhosin.get.max_value_length is set, and if so generate
1098          * a warning because it decreases ResourceLoader performance.
1099          * @return bool
1100          */
1101         protected function envCheckSuhosinMaxValueLength() {
1102                 $maxValueLength = ini_get( 'suhosin.get.max_value_length' );
1103                 if ( $maxValueLength > 0 && $maxValueLength < 1024 ) {
1104                         // Only warn if the value is below the sane 1024
1105                         $this->showMessage( 'config-suhosin-max-value-length', $maxValueLength );
1106                 }
1107
1108                 return true;
1109         }
1110
1111         /**
1112          * Convert a hex string representing a Unicode code point to that code point.
1113          * @param string $c
1114          * @return string
1115          */
1116         protected function unicodeChar( $c ) {
1117                 $c = hexdec( $c );
1118                 if ( $c <= 0x7F ) {
1119                         return chr( $c );
1120                 } elseif ( $c <= 0x7FF ) {
1121                         return chr( 0xC0 | $c >> 6 ) . chr( 0x80 | $c & 0x3F );
1122                 } elseif ( $c <= 0xFFFF ) {
1123                         return chr( 0xE0 | $c >> 12 ) . chr( 0x80 | $c >> 6 & 0x3F )
1124                         . chr( 0x80 | $c & 0x3F );
1125                 } elseif ( $c <= 0x10FFFF ) {
1126                         return chr( 0xF0 | $c >> 18 ) . chr( 0x80 | $c >> 12 & 0x3F )
1127                         . chr( 0x80 | $c >> 6 & 0x3F )
1128                         . chr( 0x80 | $c & 0x3F );
1129                 } else {
1130                         return false;
1131                 }
1132         }
1133
1134         /**
1135          * Check the libicu version
1136          */
1137         protected function envCheckLibicu() {
1138                 $utf8 = function_exists( 'utf8_normalize' );
1139                 $intl = function_exists( 'normalizer_normalize' );
1140
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                 /**
1155                  * We're going to prefer the pecl extension here unless
1156                  * utf8_normalize is more up to date.
1157                  */
1158                 if ( $utf8 ) {
1159                         $useNormalizer = 'utf8';
1160                         $utf8 = utf8_normalize( $not_normal_c, UtfNormal::UNORM_NFC );
1161                         if ( $utf8 !== $normal_c ) {
1162                                 $needsUpdate = true;
1163                         }
1164                 }
1165                 if ( $intl ) {
1166                         $useNormalizer = 'intl';
1167                         $intl = normalizer_normalize( $not_normal_c, Normalizer::FORM_C );
1168                         if ( $intl !== $normal_c ) {
1169                                 $needsUpdate = true;
1170                         }
1171                 }
1172
1173                 // Uses messages 'config-unicode-using-php', 'config-unicode-using-utf8',
1174                 // 'config-unicode-using-intl'
1175                 if ( $useNormalizer === 'php' ) {
1176                         $this->showMessage( 'config-unicode-pure-php-warning' );
1177                 } else {
1178                         $this->showMessage( 'config-unicode-using-' . $useNormalizer );
1179                         if ( $needsUpdate ) {
1180                                 $this->showMessage( 'config-unicode-update-warning' );
1181                         }
1182                 }
1183         }
1184
1185         /**
1186          * @return bool
1187          */
1188         protected function envCheckCtype() {
1189                 if ( !function_exists( 'ctype_digit' ) ) {
1190                         $this->showError( 'config-ctype' );
1191
1192                         return false;
1193                 }
1194
1195                 return true;
1196         }
1197
1198         /**
1199          * @return bool
1200          */
1201         protected function envCheckIconv() {
1202                 if ( !function_exists( 'iconv' ) ) {
1203                         $this->showError( 'config-iconv' );
1204
1205                         return false;
1206                 }
1207
1208                 return true;
1209         }
1210
1211         /**
1212          * @return bool
1213          */
1214         protected function envCheckJSON() {
1215                 if ( !function_exists( 'json_decode' ) ) {
1216                         $this->showError( 'config-json' );
1217
1218                         return false;
1219                 }
1220
1221                 return true;
1222         }
1223
1224         /**
1225          * Environment prep for the server hostname.
1226          */
1227         protected function envPrepServer() {
1228                 $server = $this->envGetDefaultServer();
1229                 if ( $server !== null ) {
1230                         $this->setVar( 'wgServer', $server );
1231                 }
1232         }
1233
1234         /**
1235          * Helper function to be called from envPrepServer()
1236          * @return string
1237          */
1238         abstract protected function envGetDefaultServer();
1239
1240         /**
1241          * Environment prep for setting the preferred PHP file extension.
1242          */
1243         protected function envPrepExtension() {
1244                 // @todo FIXME: Detect this properly
1245                 if ( defined( 'MW_INSTALL_PHP5_EXT' ) ) {
1246                         $ext = '.php5';
1247                 } else {
1248                         $ext = '.php';
1249                 }
1250                 $this->setVar( 'wgScriptExtension', $ext );
1251         }
1252
1253         /**
1254          * Environment prep for setting $IP and $wgScriptPath.
1255          */
1256         protected function envPrepPath() {
1257                 global $IP;
1258                 $IP = dirname( dirname( __DIR__ ) );
1259                 $this->setVar( 'IP', $IP );
1260         }
1261
1262         /**
1263          * Get an array of likely places we can find executables. Check a bunch
1264          * of known Unix-like defaults, as well as the PATH environment variable
1265          * (which should maybe make it work for Windows?)
1266          *
1267          * @return array
1268          */
1269         protected static function getPossibleBinPaths() {
1270                 return array_merge(
1271                         array( '/usr/bin', '/usr/local/bin', '/opt/csw/bin',
1272                                 '/usr/gnu/bin', '/usr/sfw/bin', '/sw/bin', '/opt/local/bin' ),
1273                         explode( PATH_SEPARATOR, getenv( 'PATH' ) )
1274                 );
1275         }
1276
1277         /**
1278          * Search a path for any of the given executable names. Returns the
1279          * executable name if found. Also checks the version string returned
1280          * by each executable.
1281          *
1282          * Used only by environment checks.
1283          *
1284          * @param string $path Path to search
1285          * @param array $names Array of executable names
1286          * @param array|bool $versionInfo False or array with two members:
1287          *   0 => Command to run for version check, with $1 for the full executable name
1288          *   1 => String to compare the output with
1289          *
1290          * If $versionInfo is not false, only executables with a version
1291          * matching $versionInfo[1] will be returned.
1292          * @return bool|string
1293          */
1294         public static function locateExecutable( $path, $names, $versionInfo = false ) {
1295                 if ( !is_array( $names ) ) {
1296                         $names = array( $names );
1297                 }
1298
1299                 foreach ( $names as $name ) {
1300                         $command = $path . DIRECTORY_SEPARATOR . $name;
1301
1302                         wfSuppressWarnings();
1303                         $file_exists = file_exists( $command );
1304                         wfRestoreWarnings();
1305
1306                         if ( $file_exists ) {
1307                                 if ( !$versionInfo ) {
1308                                         return $command;
1309                                 }
1310
1311                                 $file = str_replace( '$1', wfEscapeShellArg( $command ), $versionInfo[0] );
1312                                 if ( strstr( wfShellExec( $file ), $versionInfo[1] ) !== false ) {
1313                                         return $command;
1314                                 }
1315                         }
1316                 }
1317
1318                 return false;
1319         }
1320
1321         /**
1322          * Same as locateExecutable(), but checks in getPossibleBinPaths() by default
1323          * @see locateExecutable()
1324          * @param array $names Array of possible names.
1325          * @param array|bool $versionInfo Default: false or array with two members:
1326          *   0 => Command to run for version check, with $1 for the full executable name
1327          *   1 => String to compare the output with
1328          *
1329          * If $versionInfo is not false, only executables with a version
1330          * matching $versionInfo[1] will be returned.
1331          * @return bool|string
1332          */
1333         public static function locateExecutableInDefaultPaths( $names, $versionInfo = false ) {
1334                 foreach ( self::getPossibleBinPaths() as $path ) {
1335                         $exe = self::locateExecutable( $path, $names, $versionInfo );
1336                         if ( $exe !== false ) {
1337                                 return $exe;
1338                         }
1339                 }
1340
1341                 return false;
1342         }
1343
1344         /**
1345          * Checks if scripts located in the given directory can be executed via the given URL.
1346          *
1347          * Used only by environment checks.
1348          * @param string $dir
1349          * @param string $url
1350          * @return bool|int|string
1351          */
1352         public function dirIsExecutable( $dir, $url ) {
1353                 $scriptTypes = array(
1354                         'php' => array(
1355                                 "<?php echo 'ex' . 'ec';",
1356                                 "#!/var/env php5\n<?php echo 'ex' . 'ec';",
1357                         ),
1358                 );
1359
1360                 // it would be good to check other popular languages here, but it'll be slow.
1361
1362                 wfSuppressWarnings();
1363
1364                 foreach ( $scriptTypes as $ext => $contents ) {
1365                         foreach ( $contents as $source ) {
1366                                 $file = 'exectest.' . $ext;
1367
1368                                 if ( !file_put_contents( $dir . $file, $source ) ) {
1369                                         break;
1370                                 }
1371
1372                                 try {
1373                                         $text = Http::get( $url . $file, array( 'timeout' => 3 ) );
1374                                 } catch ( MWException $e ) {
1375                                         // Http::get throws with allow_url_fopen = false and no curl extension.
1376                                         $text = null;
1377                                 }
1378                                 unlink( $dir . $file );
1379
1380                                 if ( $text == 'exec' ) {
1381                                         wfRestoreWarnings();
1382
1383                                         return $ext;
1384                                 }
1385                         }
1386                 }
1387
1388                 wfRestoreWarnings();
1389
1390                 return false;
1391         }
1392
1393         /**
1394          * Checks for presence of an Apache module. Works only if PHP is running as an Apache module, too.
1395          *
1396          * @param string $moduleName Name of module to check.
1397          * @return bool
1398          */
1399         public static function apacheModulePresent( $moduleName ) {
1400                 if ( function_exists( 'apache_get_modules' ) && in_array( $moduleName, apache_get_modules() ) ) {
1401                         return true;
1402                 }
1403                 // try it the hard way
1404                 ob_start();
1405                 phpinfo( INFO_MODULES );
1406                 $info = ob_get_clean();
1407
1408                 return strpos( $info, $moduleName ) !== false;
1409         }
1410
1411         /**
1412          * ParserOptions are constructed before we determined the language, so fix it
1413          *
1414          * @param Language $lang
1415          */
1416         public function setParserLanguage( $lang ) {
1417                 $this->parserOptions->setTargetLanguage( $lang );
1418                 $this->parserOptions->setUserLang( $lang );
1419         }
1420
1421         /**
1422          * Overridden by WebInstaller to provide lastPage parameters.
1423          * @param string $page
1424          * @return string
1425          */
1426         protected function getDocUrl( $page ) {
1427                 return "{$_SERVER['PHP_SELF']}?page=" . urlencode( $page );
1428         }
1429
1430         /**
1431          * Finds extensions that follow the format /$directory/Name/Name.php,
1432          * and returns an array containing the value for 'Name' for each found extension.
1433          *
1434          * Reasonable values for $directory include 'extensions' (the default) and 'skins'.
1435          *
1436          * @param string $directory Directory to search in
1437          * @return array
1438          */
1439         public function findExtensions( $directory = 'extensions' ) {
1440                 if ( $this->getVar( 'IP' ) === null ) {
1441                         return array();
1442                 }
1443
1444                 $extDir = $this->getVar( 'IP' ) . '/' . $directory;
1445                 if ( !is_readable( $extDir ) || !is_dir( $extDir ) ) {
1446                         return array();
1447                 }
1448
1449                 $dh = opendir( $extDir );
1450                 $exts = array();
1451                 while ( ( $file = readdir( $dh ) ) !== false ) {
1452                         if ( !is_dir( "$extDir/$file" ) ) {
1453                                 continue;
1454                         }
1455                         if ( file_exists( "$extDir/$file/$file.php" ) ) {
1456                                 $exts[] = $file;
1457                         }
1458                 }
1459                 closedir( $dh );
1460                 natcasesort( $exts );
1461
1462                 return $exts;
1463         }
1464
1465         /**
1466          * Installs the auto-detected extensions.
1467          *
1468          * @return Status
1469          */
1470         protected function includeExtensions() {
1471                 global $IP;
1472                 $exts = $this->getVar( '_Extensions' );
1473                 $IP = $this->getVar( 'IP' );
1474
1475                 /**
1476                  * We need to include DefaultSettings before including extensions to avoid
1477                  * warnings about unset variables. However, the only thing we really
1478                  * want here is $wgHooks['LoadExtensionSchemaUpdates']. This won't work
1479                  * if the extension has hidden hook registration in $wgExtensionFunctions,
1480                  * but we're not opening that can of worms
1481                  * @see https://bugzilla.wikimedia.org/show_bug.cgi?id=26857
1482                  */
1483                 global $wgAutoloadClasses;
1484                 $wgAutoloadClasses = array();
1485
1486                 require "$IP/includes/DefaultSettings.php";
1487
1488                 foreach ( $exts as $e ) {
1489                         require_once "$IP/extensions/$e/$e.php";
1490                 }
1491
1492                 $hooksWeWant = isset( $wgHooks['LoadExtensionSchemaUpdates'] ) ?
1493                         $wgHooks['LoadExtensionSchemaUpdates'] : array();
1494
1495                 // Unset everyone else's hooks. Lord knows what someone might be doing
1496                 // in ParserFirstCallInit (see bug 27171)
1497                 $GLOBALS['wgHooks'] = array( 'LoadExtensionSchemaUpdates' => $hooksWeWant );
1498
1499                 return Status::newGood();
1500         }
1501
1502         /**
1503          * Get an array of install steps. Should always be in the format of
1504          * array(
1505          *   'name'     => 'someuniquename',
1506          *   'callback' => array( $obj, 'method' ),
1507          * )
1508          * There must be a config-install-$name message defined per step, which will
1509          * be shown on install.
1510          *
1511          * @param DatabaseInstaller $installer DatabaseInstaller so we can make callbacks
1512          * @return array
1513          */
1514         protected function getInstallSteps( DatabaseInstaller $installer ) {
1515                 $coreInstallSteps = array(
1516                         array( 'name' => 'database', 'callback' => array( $installer, 'setupDatabase' ) ),
1517                         array( 'name' => 'tables', 'callback' => array( $installer, 'createTables' ) ),
1518                         array( 'name' => 'interwiki', 'callback' => array( $installer, 'populateInterwikiTable' ) ),
1519                         array( 'name' => 'stats', 'callback' => array( $this, 'populateSiteStats' ) ),
1520                         array( 'name' => 'keys', 'callback' => array( $this, 'generateKeys' ) ),
1521                         array( 'name' => 'sysop', 'callback' => array( $this, 'createSysop' ) ),
1522                         array( 'name' => 'mainpage', 'callback' => array( $this, 'createMainpage' ) ),
1523                 );
1524
1525                 // Build the array of install steps starting from the core install list,
1526                 // then adding any callbacks that wanted to attach after a given step
1527                 foreach ( $coreInstallSteps as $step ) {
1528                         $this->installSteps[] = $step;
1529                         if ( isset( $this->extraInstallSteps[$step['name']] ) ) {
1530                                 $this->installSteps = array_merge(
1531                                         $this->installSteps,
1532                                         $this->extraInstallSteps[$step['name']]
1533                                 );
1534                         }
1535                 }
1536
1537                 // Prepend any steps that want to be at the beginning
1538                 if ( isset( $this->extraInstallSteps['BEGINNING'] ) ) {
1539                         $this->installSteps = array_merge(
1540                                 $this->extraInstallSteps['BEGINNING'],
1541                                 $this->installSteps
1542                         );
1543                 }
1544
1545                 // Extensions should always go first, chance to tie into hooks and such
1546                 if ( count( $this->getVar( '_Extensions' ) ) ) {
1547                         array_unshift( $this->installSteps,
1548                                 array( 'name' => 'extensions', 'callback' => array( $this, 'includeExtensions' ) )
1549                         );
1550                         $this->installSteps[] = array(
1551                                 'name' => 'extension-tables',
1552                                 'callback' => array( $installer, 'createExtensionTables' )
1553                         );
1554                 }
1555
1556                 return $this->installSteps;
1557         }
1558
1559         /**
1560          * Actually perform the installation.
1561          *
1562          * @param callable $startCB A callback array for the beginning of each step
1563          * @param callable $endCB A callback array for the end of each step
1564          *
1565          * @return array Array of Status objects
1566          */
1567         public function performInstallation( $startCB, $endCB ) {
1568                 $installResults = array();
1569                 $installer = $this->getDBInstaller();
1570                 $installer->preInstall();
1571                 $steps = $this->getInstallSteps( $installer );
1572                 foreach ( $steps as $stepObj ) {
1573                         $name = $stepObj['name'];
1574                         call_user_func_array( $startCB, array( $name ) );
1575
1576                         // Perform the callback step
1577                         $status = call_user_func( $stepObj['callback'], $installer );
1578
1579                         // Output and save the results
1580                         call_user_func( $endCB, $name, $status );
1581                         $installResults[$name] = $status;
1582
1583                         // If we've hit some sort of fatal, we need to bail.
1584                         // Callback already had a chance to do output above.
1585                         if ( !$status->isOk() ) {
1586                                 break;
1587                         }
1588                 }
1589                 if ( $status->isOk() ) {
1590                         $this->setVar( '_InstallDone', true );
1591                 }
1592
1593                 return $installResults;
1594         }
1595
1596         /**
1597          * Generate $wgSecretKey. Will warn if we had to use an insecure random source.
1598          *
1599          * @return Status
1600          */
1601         public function generateKeys() {
1602                 $keys = array( 'wgSecretKey' => 64 );
1603                 if ( strval( $this->getVar( 'wgUpgradeKey' ) ) === '' ) {
1604                         $keys['wgUpgradeKey'] = 16;
1605                 }
1606
1607                 return $this->doGenerateKeys( $keys );
1608         }
1609
1610         /**
1611          * Generate a secret value for variables using our CryptRand generator.
1612          * Produce a warning if the random source was insecure.
1613          *
1614          * @param array $keys
1615          * @return Status
1616          */
1617         protected function doGenerateKeys( $keys ) {
1618                 $status = Status::newGood();
1619
1620                 $strong = true;
1621                 foreach ( $keys as $name => $length ) {
1622                         $secretKey = MWCryptRand::generateHex( $length, true );
1623                         if ( !MWCryptRand::wasStrong() ) {
1624                                 $strong = false;
1625                         }
1626
1627                         $this->setVar( $name, $secretKey );
1628                 }
1629
1630                 if ( !$strong ) {
1631                         $names = array_keys( $keys );
1632                         $names = preg_replace( '/^(.*)$/', '\$$1', $names );
1633                         global $wgLang;
1634                         $status->warning( 'config-insecure-keys', $wgLang->listToText( $names ), count( $names ) );
1635                 }
1636
1637                 return $status;
1638         }
1639
1640         /**
1641          * Create the first user account, grant it sysop and bureaucrat rights
1642          *
1643          * @return Status
1644          */
1645         protected function createSysop() {
1646                 $name = $this->getVar( '_AdminName' );
1647                 $user = User::newFromName( $name );
1648
1649                 if ( !$user ) {
1650                         // We should've validated this earlier anyway!
1651                         return Status::newFatal( 'config-admin-error-user', $name );
1652                 }
1653
1654                 if ( $user->idForName() == 0 ) {
1655                         $user->addToDatabase();
1656
1657                         try {
1658                                 $user->setPassword( $this->getVar( '_AdminPassword' ) );
1659                         } catch ( PasswordError $pwe ) {
1660                                 return Status::newFatal( 'config-admin-error-password', $name, $pwe->getMessage() );
1661                         }
1662
1663                         $user->addGroup( 'sysop' );
1664                         $user->addGroup( 'bureaucrat' );
1665                         if ( $this->getVar( '_AdminEmail' ) ) {
1666                                 $user->setEmail( $this->getVar( '_AdminEmail' ) );
1667                         }
1668                         $user->saveSettings();
1669
1670                         // Update user count
1671                         $ssUpdate = new SiteStatsUpdate( 0, 0, 0, 0, 1 );
1672                         $ssUpdate->doUpdate();
1673                 }
1674                 $status = Status::newGood();
1675
1676                 if ( $this->getVar( '_Subscribe' ) && $this->getVar( '_AdminEmail' ) ) {
1677                         $this->subscribeToMediaWikiAnnounce( $status );
1678                 }
1679
1680                 return $status;
1681         }
1682
1683         /**
1684          * @param Status $s
1685          */
1686         private function subscribeToMediaWikiAnnounce( Status $s ) {
1687                 $params = array(
1688                         'email' => $this->getVar( '_AdminEmail' ),
1689                         'language' => 'en',
1690                         'digest' => 0
1691                 );
1692
1693                 // Mailman doesn't support as many languages as we do, so check to make
1694                 // sure their selected language is available
1695                 $myLang = $this->getVar( '_UserLang' );
1696                 if ( in_array( $myLang, $this->mediaWikiAnnounceLanguages ) ) {
1697                         $myLang = $myLang == 'pt-br' ? 'pt_BR' : $myLang; // rewrite to Mailman's pt_BR
1698                         $params['language'] = $myLang;
1699                 }
1700
1701                 if ( MWHttpRequest::canMakeRequests() ) {
1702                         $res = MWHttpRequest::factory( $this->mediaWikiAnnounceUrl,
1703                                 array( 'method' => 'POST', 'postData' => $params ) )->execute();
1704                         if ( !$res->isOK() ) {
1705                                 $s->warning( 'config-install-subscribe-fail', $res->getMessage() );
1706                         }
1707                 } else {
1708                         $s->warning( 'config-install-subscribe-notpossible' );
1709                 }
1710         }
1711
1712         /**
1713          * Insert Main Page with default content.
1714          *
1715          * @param DatabaseInstaller $installer
1716          * @return Status
1717          */
1718         protected function createMainpage( DatabaseInstaller $installer ) {
1719                 $status = Status::newGood();
1720                 try {
1721                         $page = WikiPage::factory( Title::newMainPage() );
1722                         $content = new WikitextContent(
1723                                 wfMessage( 'mainpagetext' )->inContentLanguage()->text() . "\n\n" .
1724                                 wfMessage( 'mainpagedocfooter' )->inContentLanguage()->text()
1725                         );
1726
1727                         $page->doEditContent( $content,
1728                                 '',
1729                                 EDIT_NEW,
1730                                 false,
1731                                 User::newFromName( 'MediaWiki default' )
1732                         );
1733                 } catch ( MWException $e ) {
1734                         //using raw, because $wgShowExceptionDetails can not be set yet
1735                         $status->fatal( 'config-install-mainpage-failed', $e->getMessage() );
1736                 }
1737
1738                 return $status;
1739         }
1740
1741         /**
1742          * Override the necessary bits of the config to run an installation.
1743          */
1744         public static function overrideConfig() {
1745                 define( 'MW_NO_SESSION', 1 );
1746
1747                 // Don't access the database
1748                 $GLOBALS['wgUseDatabaseMessages'] = false;
1749                 // Don't cache langconv tables
1750                 $GLOBALS['wgLanguageConverterCacheType'] = CACHE_NONE;
1751                 // Debug-friendly
1752                 $GLOBALS['wgShowExceptionDetails'] = true;
1753                 // Don't break forms
1754                 $GLOBALS['wgExternalLinkTarget'] = '_blank';
1755
1756                 // Extended debugging
1757                 $GLOBALS['wgShowSQLErrors'] = true;
1758                 $GLOBALS['wgShowDBErrorBacktrace'] = true;
1759
1760                 // Allow multiple ob_flush() calls
1761                 $GLOBALS['wgDisableOutputCompression'] = true;
1762
1763                 // Use a sensible cookie prefix (not my_wiki)
1764                 $GLOBALS['wgCookiePrefix'] = 'mw_installer';
1765
1766                 // Some of the environment checks make shell requests, remove limits
1767                 $GLOBALS['wgMaxShellMemory'] = 0;
1768
1769                 // Don't bother embedding images into generated CSS, which is not cached
1770                 $GLOBALS['wgResourceLoaderLESSFunctions']['embeddable'] = function ( $frame, $less ) {
1771                         return $less->toBool( false );
1772                 };
1773         }
1774
1775         /**
1776          * Add an installation step following the given step.
1777          *
1778          * @param callable $callback A valid installation callback array, in this form:
1779          *    array( 'name' => 'some-unique-name', 'callback' => array( $obj, 'function' ) );
1780          * @param string $findStep The step to find. Omit to put the step at the beginning
1781          */
1782         public function addInstallStep( $callback, $findStep = 'BEGINNING' ) {
1783                 $this->extraInstallSteps[$findStep][] = $callback;
1784         }
1785
1786         /**
1787          * Disable the time limit for execution.
1788          * Some long-running pages (Install, Upgrade) will want to do this
1789          */
1790         protected function disableTimeLimit() {
1791                 wfSuppressWarnings();
1792                 set_time_limit( 0 );
1793                 wfRestoreWarnings();
1794         }
1795 }