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         );
 190
 191         /**
 192          * Variables that are stored alongside globals, and are used for any
 193          * configuration of the installation process aside from the MediaWiki
 194          * configuration. Map of names to defaults.
 195          *
 196          * @var array
 197          */
 198         protected $internalDefaults = array(
 199                 '_UserLang' => 'en',
 200                 '_Environment' => false,
 201                 '_SafeMode' => false,
 202                 '_RaiseMemory' => false,
 203                 '_UpgradeDone' => false,
 204                 '_InstallDone' => false,
 205                 '_Caches' => array(),
 206                 '_InstallPassword' => '',
 207                 '_SameAccount' => true,
 208                 '_CreateDBAccount' => false,
 209                 '_NamespaceType' => 'site-name',
 210                 '_AdminName' => '', // will be set later, when the user selects language
 211                 '_AdminPassword' => '',
 212                 '_AdminPasswordConfirm' => '',
 213                 '_AdminEmail' => '',
 214                 '_Subscribe' => false,
 215                 '_SkipOptional' => 'continue',
 216                 '_RightsProfile' => 'wiki',
 217                 '_LicenseCode' => 'none',
 218                 '_CCDone' => false,
 219                 '_Extensions' => array(),
 220                 '_Skins' => array(),
 221                 '_MemCachedServers' => '',
 222                 '_UpgradeKeySupplied' => false,
 223                 '_ExistingDBSettings' => false,
 224
 225                 // $wgLogo is probably wrong (bug 48084); set something that will work.
 226                 // Single quotes work fine here, as LocalSettingsGenerator outputs this unescaped.
 227                 'wgLogo' => '$wgResourceBasePath/resources/assets/wiki.png',
 228         );
 229
 230         /**
 231          * The actual list of installation steps. This will be initialized by getInstallSteps()
 232          *
 233          * @var array
 234          */
 235         private $installSteps = array();
 236
 237         /**
 238          * Extra steps for installation, for things like DatabaseInstallers to modify
 239          *
 240          * @var array
 241          */
 242         protected $extraInstallSteps = array();
 243
 244         /**
 245          * Known object cache types and the functions used to test for their existence.
 246          *
 247          * @var array
 248          */
 249         protected $objectCaches = array(
 250                 'xcache' => 'xcache_get',
 251                 'apc' => 'apc_fetch',
 252                 'wincache' => 'wincache_ucache_get'
 253         );
 254
 255         /**
 256          * User rights profiles.
 257          *
 258          * @var array
 259          */
 260         public $rightsProfiles = array(
 261                 'wiki' => array(),
 262                 'no-anon' => array(
 263                         '*' => array( 'edit' => false )
 264                 ),
 265                 'fishbowl' => array(
 266                         '*' => array(
 267                                 'createaccount' => false,
 268                                 'edit' => false,
 269                         ),
 270                 ),
 271                 'private' => array(
 272                         '*' => array(
 273                                 'createaccount' => false,
 274                                 'edit' => false,
 275                                 'read' => false,
 276                         ),
 277                 ),
 278         );
 279
 280         /**
 281          * License types.
 282          *
 283          * @var array
 284          */
 285         public $licenses = array(
 286                 'cc-by' => array(
 287                         'url' => 'https://creativecommons.org/licenses/by/3.0/',
 288                         'icon' => '$wgResourceBasePath/resources/assets/licenses/cc-by.png',
 289                 ),
 290                 'cc-by-sa' => array(
 291                         'url' => 'https://creativecommons.org/licenses/by-sa/3.0/',
 292                         'icon' => '$wgResourceBasePath/resources/assets/licenses/cc-by-sa.png',
 293                 ),
 294                 'cc-by-nc-sa' => array(
 295                         'url' => 'https://creativecommons.org/licenses/by-nc-sa/3.0/',
 296                         'icon' => '$wgResourceBasePath/resources/assets/licenses/cc-by-nc-sa.png',
 297                 ),
 298                 'cc-0' => array(
 299                         'url' => 'https://creativecommons.org/publicdomain/zero/1.0/',
 300                         'icon' => '$wgResourceBasePath/resources/assets/licenses/cc-0.png',
 301                 ),
 302                 'pd' => array(
 303                         'url' => '',
 304                         'icon' => '$wgResourceBasePath/resources/assets/licenses/public-domain.png',
 305                 ),
 306                 'gfdl' => array(
 307                         'url' => 'https://www.gnu.org/copyleft/fdl.html',
 308                         'icon' => '$wgResourceBasePath/resources/assets/licenses/gnu-fdl.png',
 309                 ),
 310                 'none' => array(
 311                         'url' => '',
 312                         'icon' => '',
 313                         'text' => ''
 314                 ),
 315                 'cc-choose' => array(
 316                         // Details will be filled in by the selector.
 317                         'url' => '',
 318                         'icon' => '',
 319                         'text' => '',
 320                 ),
 321         );
 322
 323         /**
 324          * URL to mediawiki-announce subscription
 325          */
 326         protected $mediaWikiAnnounceUrl =
 327                 'https://lists.wikimedia.org/mailman/subscribe/mediawiki-announce';
 328
 329         /**
 330          * Supported language codes for Mailman
 331          */
 332         protected $mediaWikiAnnounceLanguages = array(
 333                 'ca', 'cs', 'da', 'de', 'en', 'es', 'et', 'eu', 'fi', 'fr', 'hr', 'hu',
 334                 'it', 'ja', 'ko', 'lt', 'nl', 'no', 'pl', 'pt', 'pt-br', 'ro', 'ru',
 335                 'sl', 'sr', 'sv', 'tr', 'uk'
 336         );
 337
 338         /**
 339          * UI interface for displaying a short message
 340          * The parameters are like parameters to wfMessage().
 341          * The messages will be in wikitext format, which will be converted to an
 342          * output format such as HTML or text before being sent to the user.
 343          * @param string $msg
 344          */
 345         abstract public function showMessage( $msg /*, ... */ );
 346
 347         /**
 348          * Same as showMessage(), but for displaying errors
 349          * @param string $msg
 350          */
 351         abstract public function showError( $msg /*, ... */ );
 352
 353         /**
 354          * Show a message to the installing user by using a Status object
 355          * @param Status $status
 356          */
 357         abstract public function showStatusMessage( Status $status );
 358
 359         /**
 360          * Constructor, always call this from child classes.
 361          */
 362         public function __construct() {
 363                 global $wgMessagesDirs, $wgUser;
 364
 365                 // Disable the i18n cache
 366                 Language::getLocalisationCache()->disableBackend();
 367                 // Disable LoadBalancer and wfGetDB etc.
 368                 LBFactory::disableBackend();
 369
 370                 // Disable object cache (otherwise CACHE_ANYTHING will try CACHE_DB and
 371                 // SqlBagOStuff will then throw since we just disabled wfGetDB)
 372                 $GLOBALS['wgMemc'] = new EmptyBagOStuff;
 373                 ObjectCache::clear();
 374                 $emptyCache = array( 'class' => 'EmptyBagOStuff' );
 375                 $GLOBALS['wgObjectCaches'] = array(
 376                         CACHE_NONE => $emptyCache,
 377                         CACHE_DB => $emptyCache,
 378                         CACHE_ANYTHING => $emptyCache,
 379                         CACHE_MEMCACHED => $emptyCache,
 380                 );
 381
 382                 // Load the installer's i18n.
 383                 $wgMessagesDirs['MediawikiInstaller'] = __DIR__ . '/i18n';
 384
 385                 // Having a user with id = 0 safeguards us from DB access via User::loadOptions().
 386                 $wgUser = User::newFromId( 0 );
 387
 388                 $this->settings = $this->internalDefaults;
 389
 390                 foreach ( $this->defaultVarNames as $var ) {
 391                         $this->settings[$var] = $GLOBALS[$var];
 392                 }
 393
 394                 $this->doEnvironmentPreps();
 395
 396                 $this->compiledDBs = array();
 397                 foreach ( self::getDBTypes() as $type ) {
 398                         $installer = $this->getDBInstaller( $type );
 399
 400                         if ( !$installer->isCompiled() ) {
 401                                 continue;
 402                         }
 403                         $this->compiledDBs[] = $type;
 404                 }
 405
 406                 $this->parserTitle = Title::newFromText( 'Installer' );
 407                 $this->parserOptions = new ParserOptions; // language will be wrong :(
 408                 $this->parserOptions->setEditSection( false );
 409         }
 410
 411         /**
 412          * Get a list of known DB types.
 413          *
 414          * @return array
 415          */
 416         public static function getDBTypes() {
 417                 return self::$dbTypes;
 418         }
 419
 420         /**
 421          * Do initial checks of the PHP environment. Set variables according to
 422          * the observed environment.
 423          *
 424          * It's possible that this may be called under the CLI SAPI, not the SAPI
 425          * that the wiki will primarily run under. In that case, the subclass should
 426          * initialise variables such as wgScriptPath, before calling this function.
 427          *
 428          * Under the web subclass, it can already be assumed that PHP 5+ is in use
 429          * and that sessions are working.
 430          *
 431          * @return Status
 432          */
 433         public function doEnvironmentChecks() {
 434                 // Php version has already been checked by entry scripts
 435                 // Show message here for information purposes
 436                 if ( wfIsHHVM() ) {
 437                         $this->showMessage( 'config-env-hhvm', HHVM_VERSION );
 438                 } else {
 439                         $this->showMessage( 'config-env-php', PHP_VERSION );
 440                 }
 441
 442                 $good = true;
 443                 // Must go here because an old version of PCRE can prevent other checks from completing
 444                 list( $pcreVersion ) = explode( ' ', PCRE_VERSION, 2 );
 445                 if ( version_compare( $pcreVersion, self::MINIMUM_PCRE_VERSION, '<' ) ) {
 446                         $this->showError( 'config-pcre-old', self::MINIMUM_PCRE_VERSION, $pcreVersion );
 447                         $good = false;
 448                 } else {
 449                         foreach ( $this->envChecks as $check ) {
 450                                 $status = $this->$check();
 451                                 if ( $status === false ) {
 452                                         $good = false;
 453                                 }
 454                         }
 455                 }
 456
 457                 $this->setVar( '_Environment', $good );
 458
 459                 return $good ? Status::newGood() : Status::newFatal( 'config-env-bad' );
 460         }
 461
 462         public function doEnvironmentPreps() {
 463                 foreach ( $this->envPreps as $prep ) {
 464                         $this->$prep();
 465                 }
 466         }
 467
 468         /**
 469          * Set a MW configuration variable, or internal installer configuration variable.
 470          *
 471          * @param string $name
 472          * @param mixed $value
 473          */
 474         public function setVar( $name, $value ) {
 475                 $this->settings[$name] = $value;
 476         }
 477
 478         /**
 479          * Get an MW configuration variable, or internal installer configuration variable.
 480          * The defaults come from $GLOBALS (ultimately DefaultSettings.php).
 481          * Installer variables are typically prefixed by an underscore.
 482          *
 483          * @param string $name
 484          * @param mixed $default
 485          *
 486          * @return mixed
 487          */
 488         public function getVar( $name, $default = null ) {
 489                 if ( !isset( $this->settings[$name] ) ) {
 490                         return $default;
 491                 } else {
 492                         return $this->settings[$name];
 493                 }
 494         }
 495
 496         /**
 497          * Get a list of DBs supported by current PHP setup
 498          *
 499          * @return array
 500          */
 501         public function getCompiledDBs() {
 502                 return $this->compiledDBs;
 503         }
 504
 505         /**
 506          * Get an instance of DatabaseInstaller for the specified DB type.
 507          *
 508          * @param mixed $type DB installer for which is needed, false to use default.
 509          *
 510          * @return DatabaseInstaller
 511          */
 512         public function getDBInstaller( $type = false ) {
 513                 if ( !$type ) {
 514                         $type = $this->getVar( 'wgDBtype' );
 515                 }
 516
 517                 $type = strtolower( $type );
 518
 519                 if ( !isset( $this->dbInstallers[$type] ) ) {
 520                         $class = ucfirst( $type ) . 'Installer';
 521                         $this->dbInstallers[$type] = new $class( $this );
 522                 }
 523
 524                 return $this->dbInstallers[$type];
 525         }
 526
 527         /**
 528          * Determine if LocalSettings.php exists. If it does, return its variables.
 529          *
 530          * @return array
 531          */
 532         public static function getExistingLocalSettings() {
 533                 global $IP;
 534
 535                 // You might be wondering why this is here. Well if you don't do this
 536                 // then some poorly-formed extensions try to call their own classes
 537                 // after immediately registering them. We really need to get extension
 538                 // registration out of the global scope and into a real format.
 539                 // @see https://bugzilla.wikimedia.org/67440
 540                 global $wgAutoloadClasses;
 541                 $wgAutoloadClasses = array();
 542
 543                 wfSuppressWarnings();
 544                 $_lsExists = file_exists( "$IP/LocalSettings.php" );
 545                 wfRestoreWarnings();
 546
 547                 if ( !$_lsExists ) {
 548                         return false;
 549                 }
 550                 unset( $_lsExists );
 551
 552                 require "$IP/includes/DefaultSettings.php";
 553                 require "$IP/LocalSettings.php";
 554
 555                 return get_defined_vars();
 556         }
 557
 558         /**
 559          * Get a fake password for sending back to the user in HTML.
 560          * This is a security mechanism to avoid compromise of the password in the
 561          * event of session ID compromise.
 562          *
 563          * @param string $realPassword
 564          *
 565          * @return string
 566          */
 567         public function getFakePassword( $realPassword ) {
 568                 return str_repeat( '*', strlen( $realPassword ) );
 569         }
 570
 571         /**
 572          * Set a variable which stores a password, except if the new value is a
 573          * fake password in which case leave it as it is.
 574          *
 575          * @param string $name
 576          * @param mixed $value
 577          */
 578         public function setPassword( $name, $value ) {
 579                 if ( !preg_match( '/^\*+$/', $value ) ) {
 580                         $this->setVar( $name, $value );
 581                 }
 582         }
 583
 584         /**
 585          * On POSIX systems return the primary group of the webserver we're running under.
 586          * On other systems just returns null.
 587          *
 588          * This is used to advice the user that he should chgrp his mw-config/data/images directory as the
 589          * webserver user before he can install.
 590          *
 591          * Public because SqliteInstaller needs it, and doesn't subclass Installer.
 592          *
 593          * @return mixed
 594          */
 595         public static function maybeGetWebserverPrimaryGroup() {
 596                 if ( !function_exists( 'posix_getegid' ) || !function_exists( 'posix_getpwuid' ) ) {
 597                         # I don't know this, this isn't UNIX.
 598                         return null;
 599                 }
 600
 601                 # posix_getegid() *not* getmygid() because we want the group of the webserver,
 602                 # not whoever owns the current script.
 603                 $gid = posix_getegid();
 604                 $getpwuid = posix_getpwuid( $gid );
 605                 $group = $getpwuid['name'];
 606
 607                 return $group;
 608         }
 609
 610         /**
 611          * Convert wikitext $text to HTML.
 612          *
 613          * This is potentially error prone since many parser features require a complete
 614          * installed MW database. The solution is to just not use those features when you
 615          * write your messages. This appears to work well enough. Basic formatting and
 616          * external links work just fine.
 617          *
 618          * But in case a translator decides to throw in a "#ifexist" or internal link or
 619          * whatever, this function is guarded to catch the attempted DB access and to present
 620          * some fallback text.
 621          *
 622          * @param string $text
 623          * @param bool $lineStart
 624          * @return string
 625          */
 626         public function parse( $text, $lineStart = false ) {
 627                 global $wgParser;
 628
 629                 try {
 630                         $out = $wgParser->parse( $text, $this->parserTitle, $this->parserOptions, $lineStart );
 631                         $html = $out->getText();
 632                 } catch ( DBAccessError $e ) {
 633                         $html = '<!--DB access attempted during parse-->  ' . htmlspecialchars( $text );
 634
 635                         if ( !empty( $this->debug ) ) {
 636                                 $html .= "<!--\n" . $e->getTraceAsString() . "\n-->";
 637                         }
 638                 }
 639
 640                 return $html;
 641         }
 642
 643         /**
 644          * @return ParserOptions
 645          */
 646         public function getParserOptions() {
 647                 return $this->parserOptions;
 648         }
 649
 650         public function disableLinkPopups() {
 651                 $this->parserOptions->setExternalLinkTarget( false );
 652         }
 653
 654         public function restoreLinkPopups() {
 655                 global $wgExternalLinkTarget;
 656                 $this->parserOptions->setExternalLinkTarget( $wgExternalLinkTarget );
 657         }
 658
 659         /**
 660          * Install step which adds a row to the site_stats table with appropriate
 661          * initial values.
 662          *
 663          * @param DatabaseInstaller $installer
 664          *
 665          * @return Status
 666          */
 667         public function populateSiteStats( DatabaseInstaller $installer ) {
 668                 $status = $installer->getConnection();
 669                 if ( !$status->isOK() ) {
 670                         return $status;
 671                 }
 672                 $status->value->insert(
 673                         'site_stats',
 674                         array(
 675                                 'ss_row_id' => 1,
 676                                 'ss_total_edits' => 0,
 677                                 'ss_good_articles' => 0,
 678                                 'ss_total_pages' => 0,
 679                                 'ss_users' => 0,
 680                                 'ss_images' => 0
 681                         ),
 682                         __METHOD__, 'IGNORE'
 683                 );
 684
 685                 return Status::newGood();
 686         }
 687
 688         /**
 689          * Exports all wg* variables stored by the installer into global scope.
 690          */
 691         public function exportVars() {
 692                 foreach ( $this->settings as $name => $value ) {
 693                         if ( substr( $name, 0, 2 ) == 'wg' ) {
 694                                 $GLOBALS[$name] = $value;
 695                         }
 696                 }
 697         }
 698
 699         /**
 700          * Environment check for DB types.
 701          * @return bool
 702          */
 703         protected function envCheckDB() {
 704                 global $wgLang;
 705
 706                 $allNames = array();
 707
 708                 // Messages: config-type-mysql, config-type-postgres, config-type-oracle,
 709                 // config-type-sqlite
 710                 foreach ( self::getDBTypes() as $name ) {
 711                         $allNames[] = wfMessage( "config-type-$name" )->text();
 712                 }
 713
 714                 $databases = $this->getCompiledDBs();
 715
 716                 $databases = array_flip( $databases );
 717                 foreach ( array_keys( $databases ) as $db ) {
 718                         $installer = $this->getDBInstaller( $db );
 719                         $status = $installer->checkPrerequisites();
 720                         if ( !$status->isGood() ) {
 721                                 $this->showStatusMessage( $status );
 722                         }
 723                         if ( !$status->isOK() ) {
 724                                 unset( $databases[$db] );
 725                         }
 726                 }
 727                 $databases = array_flip( $databases );
 728                 if ( !$databases ) {
 729                         $this->showError( 'config-no-db', $wgLang->commaList( $allNames ), count( $allNames ) );
 730
 731                         // @todo FIXME: This only works for the web installer!
 732                         return false;
 733                 }
 734
 735                 return true;
 736         }
 737
 738         /**
 739          * Environment check for register_globals.
 740          * Prevent installation if enabled
 741          * @return bool
 742          */
 743         protected function envCheckRegisterGlobals() {
 744                 if ( wfIniGetBool( 'register_globals' ) ) {
 745                         $this->showMessage( 'config-register-globals-error' );
 746                         return false;
 747                 }
 748
 749                 return true;
 750         }
 751
 752         /**
 753          * Some versions of libxml+PHP break < and > encoding horribly
 754          * @return bool
 755          */
 756         protected function envCheckBrokenXML() {
 757                 $test = new PhpXmlBugTester();
 758                 if ( !$test->ok ) {
 759                         $this->showError( 'config-brokenlibxml' );
 760
 761                         return false;
 762                 }
 763
 764                 return true;
 765         }
 766
 767         /**
 768          * Environment check for magic_quotes_(gpc|runtime|sybase).
 769          * @return bool
 770          */
 771         protected function envCheckMagicQuotes() {
 772                 $status = true;
 773                 foreach ( array( 'gpc', 'runtime', 'sybase' ) as $magicJunk ) {
 774                         if ( wfIniGetBool( "magic_quotes_$magicJunk" ) ) {
 775                                 $this->showError( "config-magic-quotes-$magicJunk" );
 776                                 $status = false;
 777                         }
 778                 }
 779
 780                 return $status;
 781         }
 782
 783         /**
 784          * Environment check for mbstring.func_overload.
 785          * @return bool
 786          */
 787         protected function envCheckMbstring() {
 788                 if ( wfIniGetBool( 'mbstring.func_overload' ) ) {
 789                         $this->showError( 'config-mbstring' );
 790
 791                         return false;
 792                 }
 793
 794                 return true;
 795         }
 796
 797         /**
 798          * Environment check for safe_mode.
 799          * @return bool
 800          */
 801         protected function envCheckSafeMode() {
 802                 if ( wfIniGetBool( 'safe_mode' ) ) {
 803                         $this->setVar( '_SafeMode', true );
 804                         $this->showMessage( 'config-safe-mode' );
 805                 }
 806
 807                 return true;
 808         }
 809
 810         /**
 811          * Environment check for the XML module.
 812          * @return bool
 813          */
 814         protected function envCheckXML() {
 815                 if ( !function_exists( "utf8_encode" ) ) {
 816                         $this->showError( 'config-xml-bad' );
 817
 818                         return false;
 819                 }
 820
 821                 return true;
 822         }
 823
 824         /**
 825          * Environment check for the PCRE module.
 826          *
 827          * @note If this check were to fail, the parser would
 828          *   probably throw an exception before the result
 829          *   of this check is shown to the user.
 830          * @return bool
 831          */
 832         protected function envCheckPCRE() {
 833                 wfSuppressWarnings();
 834                 $regexd = preg_replace( '/[\x{0430}-\x{04FF}]/iu', '', '-АБВГД-' );
 835                 // Need to check for \p support too, as PCRE can be compiled
 836                 // with utf8 support, but not unicode property support.
 837                 // check that \p{Zs} (space separators) matches
 838                 // U+3000 (Ideographic space)
 839                 $regexprop = preg_replace( '/\p{Zs}/u', '', "-\xE3\x80\x80-" );
 840                 wfRestoreWarnings();
 841                 if ( $regexd != '--' || $regexprop != '--' ) {
 842                         $this->showError( 'config-pcre-no-utf8' );
 843
 844                         return false;
 845                 }
 846
 847                 return true;
 848         }
 849
 850         /**
 851          * Environment check for available memory.
 852          * @return bool
 853          */
 854         protected function envCheckMemory() {
 855                 $limit = ini_get( 'memory_limit' );
 856
 857                 if ( !$limit || $limit == -1 ) {
 858                         return true;
 859                 }
 860
 861                 $n = wfShorthandToInteger( $limit );
 862
 863                 if ( $n < $this->minMemorySize * 1024 * 1024 ) {
 864                         $newLimit = "{$this->minMemorySize}M";
 865
 866                         if ( ini_set( "memory_limit", $newLimit ) === false ) {
 867                                 $this->showMessage( 'config-memory-bad', $limit );
 868                         } else {
 869                                 $this->showMessage( 'config-memory-raised', $limit, $newLimit );
 870                                 $this->setVar( '_RaiseMemory', true );
 871                         }
 872                 }
 873
 874                 return true;
 875         }
 876
 877         /**
 878          * Environment check for compiled object cache types.
 879          */
 880         protected function envCheckCache() {
 881                 $caches = array();
 882                 foreach ( $this->objectCaches as $name => $function ) {
 883                         if ( function_exists( $function ) ) {
 884                                 if ( $name == 'xcache' && !wfIniGetBool( 'xcache.var_size' ) ) {
 885                                         continue;
 886                                 }
 887                                 $caches[$name] = true;
 888                         }
 889                 }
 890
 891                 if ( !$caches ) {
 892                         $this->showMessage( 'config-no-cache' );
 893                 }
 894
 895                 $this->setVar( '_Caches', $caches );
 896         }
 897
 898         /**
 899          * Scare user to death if they have mod_security or mod_security2
 900          * @return bool
 901          */
 902         protected function envCheckModSecurity() {
 903                 if ( self::apacheModulePresent( 'mod_security' )
 904                         || self::apacheModulePresent( 'mod_security2' ) ) {
 905                         $this->showMessage( 'config-mod-security' );
 906                 }
 907
 908                 return true;
 909         }
 910
 911         /**
 912          * Search for GNU diff3.
 913          * @return bool
 914          */
 915         protected function envCheckDiff3() {
 916                 $names = array( "gdiff3", "diff3", "diff3.exe" );
 917                 $versionInfo = array( '$1 --version 2>&1', 'GNU diffutils' );
 918
 919                 $diff3 = self::locateExecutableInDefaultPaths( $names, $versionInfo );
 920
 921                 if ( $diff3 ) {
 922                         $this->setVar( 'wgDiff3', $diff3 );
 923                 } else {
 924                         $this->setVar( 'wgDiff3', false );
 925                         $this->showMessage( 'config-diff3-bad' );
 926                 }
 927
 928                 return true;
 929         }
 930
 931         /**
 932          * Environment check for ImageMagick and GD.
 933          * @return bool
 934          */
 935         protected function envCheckGraphics() {
 936                 $names = array( wfIsWindows() ? 'convert.exe' : 'convert' );
 937                 $versionInfo = array( '$1 -version', 'ImageMagick' );
 938                 $convert = self::locateExecutableInDefaultPaths( $names, $versionInfo );
 939
 940                 $this->setVar( 'wgImageMagickConvertCommand', '' );
 941                 if ( $convert ) {
 942                         $this->setVar( 'wgImageMagickConvertCommand', $convert );
 943                         $this->showMessage( 'config-imagemagick', $convert );
 944
 945                         return true;
 946                 } elseif ( function_exists( 'imagejpeg' ) ) {
 947                         $this->showMessage( 'config-gd' );
 948                 } else {
 949                         $this->showMessage( 'config-no-scaling' );
 950                 }
 951
 952                 return true;
 953         }
 954
 955         /**
 956          * Search for git.
 957          *
 958          * @since 1.22
 959          * @return bool
 960          */
 961         protected function envCheckGit() {
 962                 $names = array( wfIsWindows() ? 'git.exe' : 'git' );
 963                 $versionInfo = array( '$1 --version', 'git version' );
 964
 965                 $git = self::locateExecutableInDefaultPaths( $names, $versionInfo );
 966
 967                 if ( $git ) {
 968                         $this->setVar( 'wgGitBin', $git );
 969                         $this->showMessage( 'config-git', $git );
 970                 } else {
 971                         $this->setVar( 'wgGitBin', false );
 972                         $this->showMessage( 'config-git-bad' );
 973                 }
 974
 975                 return true;
 976         }
 977
 978         /**
 979          * Environment check to inform user which server we've assumed.
 980          *
 981          * @return bool
 982          */
 983         protected function envCheckServer() {
 984                 $server = $this->envGetDefaultServer();
 985                 if ( $server !== null ) {
 986                         $this->showMessage( 'config-using-server', $server );
 987                 }
 988                 return true;
 989         }
 990
 991         /**
 992          * Environment check to inform user which paths we've assumed.
 993          *
 994          * @return bool
 995          */
 996         protected function envCheckPath() {
 997                 $this->showMessage(
 998                         'config-using-uri',
 999                         $this->getVar( 'wgServer' ),
1000                         $this->getVar( 'wgScriptPath' )
1001                 );
1002                 return true;
1003         }
1004
1005         /**
1006          * Environment check for preferred locale in shell
1007          * @return bool
1008          */
1009         protected function envCheckShellLocale() {
1010                 $os = php_uname( 's' );
1011                 $supported = array( 'Linux', 'SunOS', 'HP-UX', 'Darwin' ); # Tested these
1012
1013                 if ( !in_array( $os, $supported ) ) {
1014                         return true;
1015                 }
1016
1017                 # Get a list of available locales.
1018                 $ret = false;
1019                 $lines = wfShellExec( '/usr/bin/locale -a', $ret );
1020
1021                 if ( $ret ) {
1022                         return true;
1023                 }
1024
1025                 $lines = array_map( 'trim', explode( "\n", $lines ) );
1026                 $candidatesByLocale = array();
1027                 $candidatesByLang = array();
1028
1029                 foreach ( $lines as $line ) {
1030                         if ( $line === '' ) {
1031                                 continue;
1032                         }
1033
1034                         if ( !preg_match( '/^([a-zA-Z]+)(_[a-zA-Z]+|)\.(utf8|UTF-8)(@[a-zA-Z_]*|)$/i', $line, $m ) ) {
1035                                 continue;
1036                         }
1037
1038                         list( , $lang, , , ) = $m;
1039
1040                         $candidatesByLocale[$m[0]] = $m;
1041                         $candidatesByLang[$lang][] = $m;
1042                 }
1043
1044                 # Try the current value of LANG.
1045                 if ( isset( $candidatesByLocale[getenv( 'LANG' )] ) ) {
1046                         $this->setVar( 'wgShellLocale', getenv( 'LANG' ) );
1047
1048                         return true;
1049                 }
1050
1051                 # Try the most common ones.
1052                 $commonLocales = array( 'en_US.UTF-8', 'en_US.utf8', 'de_DE.UTF-8', 'de_DE.utf8' );
1053                 foreach ( $commonLocales as $commonLocale ) {
1054                         if ( isset( $candidatesByLocale[$commonLocale] ) ) {
1055                                 $this->setVar( 'wgShellLocale', $commonLocale );
1056
1057                                 return true;
1058                         }
1059                 }
1060
1061                 # Is there an available locale in the Wiki's language?
1062                 $wikiLang = $this->getVar( 'wgLanguageCode' );
1063
1064                 if ( isset( $candidatesByLang[$wikiLang] ) ) {
1065                         $m = reset( $candidatesByLang[$wikiLang] );
1066                         $this->setVar( 'wgShellLocale', $m[0] );
1067
1068                         return true;
1069                 }
1070
1071                 # Are there any at all?
1072                 if ( count( $candidatesByLocale ) ) {
1073                         $m = reset( $candidatesByLocale );
1074                         $this->setVar( 'wgShellLocale', $m[0] );
1075
1076                         return true;
1077                 }
1078
1079                 # Give up.
1080                 return true;
1081         }
1082
1083         /**
1084          * Environment check for the permissions of the uploads directory
1085          * @return bool
1086          */
1087         protected function envCheckUploadsDirectory() {
1088                 global $IP;
1089
1090                 $dir = $IP . '/images/';
1091                 $url = $this->getVar( 'wgServer' ) . $this->getVar( 'wgScriptPath' ) . '/images/';
1092                 $safe = !$this->dirIsExecutable( $dir, $url );
1093
1094                 if ( !$safe ) {
1095                         $this->showMessage( 'config-uploads-not-safe', $dir );
1096                 }
1097
1098                 return true;
1099         }
1100
1101         /**
1102          * Checks if suhosin.get.max_value_length is set, and if so generate
1103          * a warning because it decreases ResourceLoader performance.
1104          * @return bool
1105          */
1106         protected function envCheckSuhosinMaxValueLength() {
1107                 $maxValueLength = ini_get( 'suhosin.get.max_value_length' );
1108                 if ( $maxValueLength > 0 && $maxValueLength < 1024 ) {
1109                         // Only warn if the value is below the sane 1024
1110                         $this->showMessage( 'config-suhosin-max-value-length', $maxValueLength );
1111                 }
1112
1113                 return true;
1114         }
1115
1116         /**
1117          * Convert a hex string representing a Unicode code point to that code point.
1118          * @param string $c
1119          * @return string
1120          */
1121         protected function unicodeChar( $c ) {
1122                 $c = hexdec( $c );
1123                 if ( $c <= 0x7F ) {
1124                         return chr( $c );
1125                 } elseif ( $c <= 0x7FF ) {
1126                         return chr( 0xC0 | $c >> 6 ) . chr( 0x80 | $c & 0x3F );
1127                 } elseif ( $c <= 0xFFFF ) {
1128                         return chr( 0xE0 | $c >> 12 ) . chr( 0x80 | $c >> 6 & 0x3F )
1129                         . chr( 0x80 | $c & 0x3F );
1130                 } elseif ( $c <= 0x10FFFF ) {
1131                         return chr( 0xF0 | $c >> 18 ) . chr( 0x80 | $c >> 12 & 0x3F )
1132                         . chr( 0x80 | $c >> 6 & 0x3F )
1133                         . chr( 0x80 | $c & 0x3F );
1134                 } else {
1135                         return false;
1136                 }
1137         }
1138
1139         /**
1140          * Check the libicu version
1141          */
1142         protected function envCheckLibicu() {
1143                 /**
1144                  * This needs to be updated something that the latest libicu
1145                  * will properly normalize.  This normalization was found at
1146                  * http://www.unicode.org/versions/Unicode5.2.0/#Character_Additions
1147                  * Note that we use the hex representation to create the code
1148                  * points in order to avoid any Unicode-destroying during transit.
1149                  */
1150                 $not_normal_c = $this->unicodeChar( "FA6C" );
1151                 $normal_c = $this->unicodeChar( "242EE" );
1152
1153                 $useNormalizer = 'php';
1154                 $needsUpdate = false;
1155
1156                 if ( function_exists( 'normalizer_normalize' ) ) {
1157                         $useNormalizer = 'intl';
1158                         $intl = normalizer_normalize( $not_normal_c, Normalizer::FORM_C );
1159                         if ( $intl !== $normal_c ) {
1160                                 $needsUpdate = true;
1161                         }
1162                 }
1163
1164                 // Uses messages 'config-unicode-using-php' and 'config-unicode-using-intl'
1165                 if ( $useNormalizer === 'php' ) {
1166                         $this->showMessage( 'config-unicode-pure-php-warning' );
1167                 } else {
1168                         $this->showMessage( 'config-unicode-using-' . $useNormalizer );
1169                         if ( $needsUpdate ) {
1170                                 $this->showMessage( 'config-unicode-update-warning' );
1171                         }
1172                 }
1173         }
1174
1175         /**
1176          * @return bool
1177          */
1178         protected function envCheckCtype() {
1179                 if ( !function_exists( 'ctype_digit' ) ) {
1180                         $this->showError( 'config-ctype' );
1181
1182                         return false;
1183                 }
1184
1185                 return true;
1186         }
1187
1188         /**
1189          * @return bool
1190          */
1191         protected function envCheckIconv() {
1192                 if ( !function_exists( 'iconv' ) ) {
1193                         $this->showError( 'config-iconv' );
1194
1195                         return false;
1196                 }
1197
1198                 return true;
1199         }
1200
1201         /**
1202          * @return bool
1203          */
1204         protected function envCheckJSON() {
1205                 if ( !function_exists( 'json_decode' ) ) {
1206                         $this->showError( 'config-json' );
1207
1208                         return false;
1209                 }
1210
1211                 return true;
1212         }
1213
1214         /**
1215          * Environment prep for the server hostname.
1216          */
1217         protected function envPrepServer() {
1218                 $server = $this->envGetDefaultServer();
1219                 if ( $server !== null ) {
1220                         $this->setVar( 'wgServer', $server );
1221                 }
1222         }
1223
1224         /**
1225          * Helper function to be called from envPrepServer()
1226          * @return string
1227          */
1228         abstract protected function envGetDefaultServer();
1229
1230         /**
1231          * Environment prep for setting the preferred PHP file extension.
1232          */
1233         protected function envPrepExtension() {
1234                 // @todo FIXME: Detect this properly
1235                 if ( defined( 'MW_INSTALL_PHP5_EXT' ) ) {
1236                         $ext = '.php5';
1237                 } else {
1238                         $ext = '.php';
1239                 }
1240                 $this->setVar( 'wgScriptExtension', $ext );
1241         }
1242
1243         /**
1244          * Environment prep for setting $IP and $wgScriptPath.
1245          */
1246         protected function envPrepPath() {
1247                 global $IP;
1248                 $IP = dirname( dirname( __DIR__ ) );
1249                 $this->setVar( 'IP', $IP );
1250         }
1251
1252         /**
1253          * Get an array of likely places we can find executables. Check a bunch
1254          * of known Unix-like defaults, as well as the PATH environment variable
1255          * (which should maybe make it work for Windows?)
1256          *
1257          * @return array
1258          */
1259         protected static function getPossibleBinPaths() {
1260                 return array_merge(
1261                         array( '/usr/bin', '/usr/local/bin', '/opt/csw/bin',
1262                                 '/usr/gnu/bin', '/usr/sfw/bin', '/sw/bin', '/opt/local/bin' ),
1263                         explode( PATH_SEPARATOR, getenv( 'PATH' ) )
1264                 );
1265         }
1266
1267         /**
1268          * Search a path for any of the given executable names. Returns the
1269          * executable name if found. Also checks the version string returned
1270          * by each executable.
1271          *
1272          * Used only by environment checks.
1273          *
1274          * @param string $path Path to search
1275          * @param array $names Array of executable names
1276          * @param array|bool $versionInfo False or array with two members:
1277          *   0 => Command to run for version check, with $1 for the full executable name
1278          *   1 => String to compare the output with
1279          *
1280          * If $versionInfo is not false, only executables with a version
1281          * matching $versionInfo[1] will be returned.
1282          * @return bool|string
1283          */
1284         public static function locateExecutable( $path, $names, $versionInfo = false ) {
1285                 if ( !is_array( $names ) ) {
1286                         $names = array( $names );
1287                 }
1288
1289                 foreach ( $names as $name ) {
1290                         $command = $path . DIRECTORY_SEPARATOR . $name;
1291
1292                         wfSuppressWarnings();
1293                         $file_exists = file_exists( $command );
1294                         wfRestoreWarnings();
1295
1296                         if ( $file_exists ) {
1297                                 if ( !$versionInfo ) {
1298                                         return $command;
1299                                 }
1300
1301                                 $file = str_replace( '$1', wfEscapeShellArg( $command ), $versionInfo[0] );
1302                                 if ( strstr( wfShellExec( $file ), $versionInfo[1] ) !== false ) {
1303                                         return $command;
1304                                 }
1305                         }
1306                 }
1307
1308                 return false;
1309         }
1310
1311         /**
1312          * Same as locateExecutable(), but checks in getPossibleBinPaths() by default
1313          * @see locateExecutable()
1314          * @param array $names Array of possible names.
1315          * @param array|bool $versionInfo Default: false or array with two members:
1316          *   0 => Command to run for version check, with $1 for the full executable name
1317          *   1 => String to compare the output with
1318          *
1319          * If $versionInfo is not false, only executables with a version
1320          * matching $versionInfo[1] will be returned.
1321          * @return bool|string
1322          */
1323         public static function locateExecutableInDefaultPaths( $names, $versionInfo = false ) {
1324                 foreach ( self::getPossibleBinPaths() as $path ) {
1325                         $exe = self::locateExecutable( $path, $names, $versionInfo );
1326                         if ( $exe !== false ) {
1327                                 return $exe;
1328                         }
1329                 }
1330
1331                 return false;
1332         }
1333
1334         /**
1335          * Checks if scripts located in the given directory can be executed via the given URL.
1336          *
1337          * Used only by environment checks.
1338          * @param string $dir
1339          * @param string $url
1340          * @return bool|int|string
1341          */
1342         public function dirIsExecutable( $dir, $url ) {
1343                 $scriptTypes = array(
1344                         'php' => array(
1345                                 "<?php echo 'ex' . 'ec';",
1346                                 "#!/var/env php5\n<?php echo 'ex' . 'ec';",
1347                         ),
1348                 );
1349
1350                 // it would be good to check other popular languages here, but it'll be slow.
1351
1352                 wfSuppressWarnings();
1353
1354                 foreach ( $scriptTypes as $ext => $contents ) {
1355                         foreach ( $contents as $source ) {
1356                                 $file = 'exectest.' . $ext;
1357
1358                                 if ( !file_put_contents( $dir . $file, $source ) ) {
1359                                         break;
1360                                 }
1361
1362                                 try {
1363                                         $text = Http::get( $url . $file, array( 'timeout' => 3 ), __METHOD__ );
1364                                 } catch ( Exception $e ) {
1365                                         // Http::get throws with allow_url_fopen = false and no curl extension.
1366                                         $text = null;
1367                                 }
1368                                 unlink( $dir . $file );
1369
1370                                 if ( $text == 'exec' ) {
1371                                         wfRestoreWarnings();
1372
1373                                         return $ext;
1374                                 }
1375                         }
1376                 }
1377
1378                 wfRestoreWarnings();
1379
1380                 return false;
1381         }
1382
1383         /**
1384          * Checks for presence of an Apache module. Works only if PHP is running as an Apache module, too.
1385          *
1386          * @param string $moduleName Name of module to check.
1387          * @return bool
1388          */
1389         public static function apacheModulePresent( $moduleName ) {
1390                 if ( function_exists( 'apache_get_modules' ) && in_array( $moduleName, apache_get_modules() ) ) {
1391                         return true;
1392                 }
1393                 // try it the hard way
1394                 ob_start();
1395                 phpinfo( INFO_MODULES );
1396                 $info = ob_get_clean();
1397
1398                 return strpos( $info, $moduleName ) !== false;
1399         }
1400
1401         /**
1402          * ParserOptions are constructed before we determined the language, so fix it
1403          *
1404          * @param Language $lang
1405          */
1406         public function setParserLanguage( $lang ) {
1407                 $this->parserOptions->setTargetLanguage( $lang );
1408                 $this->parserOptions->setUserLang( $lang );
1409         }
1410
1411         /**
1412          * Overridden by WebInstaller to provide lastPage parameters.
1413          * @param string $page
1414          * @return string
1415          */
1416         protected function getDocUrl( $page ) {
1417                 return "{$_SERVER['PHP_SELF']}?page=" . urlencode( $page );
1418         }
1419
1420         /**
1421          * Finds extensions that follow the format /$directory/Name/Name.php,
1422          * and returns an array containing the value for 'Name' for each found extension.
1423          *
1424          * Reasonable values for $directory include 'extensions' (the default) and 'skins'.
1425          *
1426          * @param string $directory Directory to search in
1427          * @return array
1428          */
1429         public function findExtensions( $directory = 'extensions' ) {
1430                 if ( $this->getVar( 'IP' ) === null ) {
1431                         return array();
1432                 }
1433
1434                 $extDir = $this->getVar( 'IP' ) . '/' . $directory;
1435                 if ( !is_readable( $extDir ) || !is_dir( $extDir ) ) {
1436                         return array();
1437                 }
1438
1439                 // extensions -> extension.json, skins -> skin.json
1440                 $jsonFile = substr( $directory, 0, strlen( $directory ) -1 ) . '.json';
1441
1442                 $dh = opendir( $extDir );
1443                 $exts = array();
1444                 while ( ( $file = readdir( $dh ) ) !== false ) {
1445                         if ( !is_dir( "$extDir/$file" ) ) {
1446                                 continue;
1447                         }
1448                         if ( file_exists( "$extDir/$file/$jsonFile" ) || file_exists( "$extDir/$file/$file.php" ) ) {
1449                                 $exts[] = $file;
1450                         }
1451                 }
1452                 closedir( $dh );
1453                 natcasesort( $exts );
1454
1455                 return $exts;
1456         }
1457
1458         /**
1459          * Returns a default value to be used for $wgDefaultSkin: normally the one set in DefaultSettings,
1460          * but will fall back to another if the default skin is missing and some other one is present
1461          * instead.
1462          *
1463          * @param string[] $skinNames Names of installed skins.
1464          * @return string
1465          */
1466         public function getDefaultSkin( array $skinNames ) {
1467                 $defaultSkin = $GLOBALS['wgDefaultSkin'];
1468                 if ( !$skinNames || in_array( $defaultSkin, $skinNames ) ) {
1469                         return $defaultSkin;
1470                 } else {
1471                         return $skinNames[0];
1472                 }
1473         }
1474
1475         /**
1476          * Installs the auto-detected extensions.
1477          *
1478          * @return Status
1479          */
1480         protected function includeExtensions() {
1481                 global $IP;
1482                 $exts = $this->getVar( '_Extensions' );
1483                 $IP = $this->getVar( 'IP' );
1484
1485                 /**
1486                  * We need to include DefaultSettings before including extensions to avoid
1487                  * warnings about unset variables. However, the only thing we really
1488                  * want here is $wgHooks['LoadExtensionSchemaUpdates']. This won't work
1489                  * if the extension has hidden hook registration in $wgExtensionFunctions,
1490                  * but we're not opening that can of worms
1491                  * @see https://bugzilla.wikimedia.org/show_bug.cgi?id=26857
1492                  */
1493                 global $wgAutoloadClasses;
1494                 $wgAutoloadClasses = array();
1495                 $queue = array();
1496
1497                 require "$IP/includes/DefaultSettings.php";
1498
1499                 foreach ( $exts as $e ) {
1500                         if ( file_exists( "$IP/extensions/$e/extension.json" ) ) {
1501                                 $queue["$IP/extensions/$e/extension.json"] = 1;
1502                         } else {
1503                                 require_once "$IP/extensions/$e/$e.php";
1504                         }
1505                 }
1506
1507                 $registry = new ExtensionRegistry();
1508                 $data = $registry->readFromQueue( $queue );
1509                 $wgAutoloadClasses += $data['autoload'];
1510
1511                 $hooksWeWant = isset( $wgHooks['LoadExtensionSchemaUpdates'] ) ?
1512                         $wgHooks['LoadExtensionSchemaUpdates'] : array();
1513
1514                 if ( isset( $data['globals']['wgHooks']['LoadExtensionSchemaUpdates'] ) ) {
1515                         $hooksWeWant = array_merge_recursive(
1516                                 $hooksWeWant,
1517                                 $data['globals']['wgHooks']['LoadExtensionSchemaUpdates']
1518                         );
1519                 }
1520                 // Unset everyone else's hooks. Lord knows what someone might be doing
1521                 // in ParserFirstCallInit (see bug 27171)
1522                 $GLOBALS['wgHooks'] = array( 'LoadExtensionSchemaUpdates' => $hooksWeWant );
1523
1524                 return Status::newGood();
1525         }
1526
1527         /**
1528          * Get an array of install steps. Should always be in the format of
1529          * array(
1530          *   'name'     => 'someuniquename',
1531          *   'callback' => array( $obj, 'method' ),
1532          * )
1533          * There must be a config-install-$name message defined per step, which will
1534          * be shown on install.
1535          *
1536          * @param DatabaseInstaller $installer DatabaseInstaller so we can make callbacks
1537          * @return array
1538          */
1539         protected function getInstallSteps( DatabaseInstaller $installer ) {
1540                 $coreInstallSteps = array(
1541                         array( 'name' => 'database', 'callback' => array( $installer, 'setupDatabase' ) ),
1542                         array( 'name' => 'tables', 'callback' => array( $installer, 'createTables' ) ),
1543                         array( 'name' => 'interwiki', 'callback' => array( $installer, 'populateInterwikiTable' ) ),
1544                         array( 'name' => 'stats', 'callback' => array( $this, 'populateSiteStats' ) ),
1545                         array( 'name' => 'keys', 'callback' => array( $this, 'generateKeys' ) ),
1546                         array( 'name' => 'updates', 'callback' => array( $installer, 'insertUpdateKeys' ) ),
1547                         array( 'name' => 'sysop', 'callback' => array( $this, 'createSysop' ) ),
1548                         array( 'name' => 'mainpage', 'callback' => array( $this, 'createMainpage' ) ),
1549                 );
1550
1551                 // Build the array of install steps starting from the core install list,
1552                 // then adding any callbacks that wanted to attach after a given step
1553                 foreach ( $coreInstallSteps as $step ) {
1554                         $this->installSteps[] = $step;
1555                         if ( isset( $this->extraInstallSteps[$step['name']] ) ) {
1556                                 $this->installSteps = array_merge(
1557                                         $this->installSteps,
1558                                         $this->extraInstallSteps[$step['name']]
1559                                 );
1560                         }
1561                 }
1562
1563                 // Prepend any steps that want to be at the beginning
1564                 if ( isset( $this->extraInstallSteps['BEGINNING'] ) ) {
1565                         $this->installSteps = array_merge(
1566                                 $this->extraInstallSteps['BEGINNING'],
1567                                 $this->installSteps
1568                         );
1569                 }
1570
1571                 // Extensions should always go first, chance to tie into hooks and such
1572                 if ( count( $this->getVar( '_Extensions' ) ) ) {
1573                         array_unshift( $this->installSteps,
1574                                 array( 'name' => 'extensions', 'callback' => array( $this, 'includeExtensions' ) )
1575                         );
1576                         $this->installSteps[] = array(
1577                                 'name' => 'extension-tables',
1578                                 'callback' => array( $installer, 'createExtensionTables' )
1579                         );
1580                 }
1581
1582                 return $this->installSteps;
1583         }
1584
1585         /**
1586          * Actually perform the installation.
1587          *
1588          * @param callable $startCB A callback array for the beginning of each step
1589          * @param callable $endCB A callback array for the end of each step
1590          *
1591          * @return array Array of Status objects
1592          */
1593         public function performInstallation( $startCB, $endCB ) {
1594                 $installResults = array();
1595                 $installer = $this->getDBInstaller();
1596                 $installer->preInstall();
1597                 $steps = $this->getInstallSteps( $installer );
1598                 foreach ( $steps as $stepObj ) {
1599                         $name = $stepObj['name'];
1600                         call_user_func_array( $startCB, array( $name ) );
1601
1602                         // Perform the callback step
1603                         $status = call_user_func( $stepObj['callback'], $installer );
1604
1605                         // Output and save the results
1606                         call_user_func( $endCB, $name, $status );
1607                         $installResults[$name] = $status;
1608
1609                         // If we've hit some sort of fatal, we need to bail.
1610                         // Callback already had a chance to do output above.
1611                         if ( !$status->isOk() ) {
1612                                 break;
1613                         }
1614                 }
1615                 if ( $status->isOk() ) {
1616                         $this->setVar( '_InstallDone', true );
1617                 }
1618
1619                 return $installResults;
1620         }
1621
1622         /**
1623          * Generate $wgSecretKey. Will warn if we had to use an insecure random source.
1624          *
1625          * @return Status
1626          */
1627         public function generateKeys() {
1628                 $keys = array( 'wgSecretKey' => 64 );
1629                 if ( strval( $this->getVar( 'wgUpgradeKey' ) ) === '' ) {
1630                         $keys['wgUpgradeKey'] = 16;
1631                 }
1632
1633                 return $this->doGenerateKeys( $keys );
1634         }
1635
1636         /**
1637          * Generate a secret value for variables using our CryptRand generator.
1638          * Produce a warning if the random source was insecure.
1639          *
1640          * @param array $keys
1641          * @return Status
1642          */
1643         protected function doGenerateKeys( $keys ) {
1644                 $status = Status::newGood();
1645
1646                 $strong = true;
1647                 foreach ( $keys as $name => $length ) {
1648                         $secretKey = MWCryptRand::generateHex( $length, true );
1649                         if ( !MWCryptRand::wasStrong() ) {
1650                                 $strong = false;
1651                         }
1652
1653                         $this->setVar( $name, $secretKey );
1654                 }
1655
1656                 if ( !$strong ) {
1657                         $names = array_keys( $keys );
1658                         $names = preg_replace( '/^(.*)$/', '\$$1', $names );
1659                         global $wgLang;
1660                         $status->warning( 'config-insecure-keys', $wgLang->listToText( $names ), count( $names ) );
1661                 }
1662
1663                 return $status;
1664         }
1665
1666         /**
1667          * Create the first user account, grant it sysop and bureaucrat rights
1668          *
1669          * @return Status
1670          */
1671         protected function createSysop() {
1672                 $name = $this->getVar( '_AdminName' );
1673                 $user = User::newFromName( $name );
1674
1675                 if ( !$user ) {
1676                         // We should've validated this earlier anyway!
1677                         return Status::newFatal( 'config-admin-error-user', $name );
1678                 }
1679
1680                 if ( $user->idForName() == 0 ) {
1681                         $user->addToDatabase();
1682
1683                         try {
1684                                 $user->setPassword( $this->getVar( '_AdminPassword' ) );
1685                         } catch ( PasswordError $pwe ) {
1686                                 return Status::newFatal( 'config-admin-error-password', $name, $pwe->getMessage() );
1687                         }
1688
1689                         $user->addGroup( 'sysop' );
1690                         $user->addGroup( 'bureaucrat' );
1691                         if ( $this->getVar( '_AdminEmail' ) ) {
1692                                 $user->setEmail( $this->getVar( '_AdminEmail' ) );
1693                         }
1694                         $user->saveSettings();
1695
1696                         // Update user count
1697                         $ssUpdate = new SiteStatsUpdate( 0, 0, 0, 0, 1 );
1698                         $ssUpdate->doUpdate();
1699                 }
1700                 $status = Status::newGood();
1701
1702                 if ( $this->getVar( '_Subscribe' ) && $this->getVar( '_AdminEmail' ) ) {
1703                         $this->subscribeToMediaWikiAnnounce( $status );
1704                 }
1705
1706                 return $status;
1707         }
1708
1709         /**
1710          * @param Status $s
1711          */
1712         private function subscribeToMediaWikiAnnounce( Status $s ) {
1713                 $params = array(
1714                         'email' => $this->getVar( '_AdminEmail' ),
1715                         'language' => 'en',
1716                         'digest' => 0
1717                 );
1718
1719                 // Mailman doesn't support as many languages as we do, so check to make
1720                 // sure their selected language is available
1721                 $myLang = $this->getVar( '_UserLang' );
1722                 if ( in_array( $myLang, $this->mediaWikiAnnounceLanguages ) ) {
1723                         $myLang = $myLang == 'pt-br' ? 'pt_BR' : $myLang; // rewrite to Mailman's pt_BR
1724                         $params['language'] = $myLang;
1725                 }
1726
1727                 if ( MWHttpRequest::canMakeRequests() ) {
1728                         $res = MWHttpRequest::factory( $this->mediaWikiAnnounceUrl,
1729                                 array( 'method' => 'POST', 'postData' => $params ), __METHOD__ )->execute();
1730                         if ( !$res->isOK() ) {
1731                                 $s->warning( 'config-install-subscribe-fail', $res->getMessage() );
1732                         }
1733                 } else {
1734                         $s->warning( 'config-install-subscribe-notpossible' );
1735                 }
1736         }
1737
1738         /**
1739          * Insert Main Page with default content.
1740          *
1741          * @param DatabaseInstaller $installer
1742          * @return Status
1743          */
1744         protected function createMainpage( DatabaseInstaller $installer ) {
1745                 $status = Status::newGood();
1746                 try {
1747                         $page = WikiPage::factory( Title::newMainPage() );
1748                         $content = new WikitextContent(
1749                                 wfMessage( 'mainpagetext' )->inContentLanguage()->text() . "\n\n" .
1750                                 wfMessage( 'mainpagedocfooter' )->inContentLanguage()->text()
1751                         );
1752
1753                         $page->doEditContent( $content,
1754                                 '',
1755                                 EDIT_NEW,
1756                                 false,
1757                                 User::newFromName( 'MediaWiki default' )
1758                         );
1759                 } catch ( Exception $e ) {
1760                         //using raw, because $wgShowExceptionDetails can not be set yet
1761                         $status->fatal( 'config-install-mainpage-failed', $e->getMessage() );
1762                 }
1763
1764                 return $status;
1765         }
1766
1767         /**
1768          * Override the necessary bits of the config to run an installation.
1769          */
1770         public static function overrideConfig() {
1771                 define( 'MW_NO_SESSION', 1 );
1772
1773                 // Don't access the database
1774                 $GLOBALS['wgUseDatabaseMessages'] = false;
1775                 // Don't cache langconv tables
1776                 $GLOBALS['wgLanguageConverterCacheType'] = CACHE_NONE;
1777                 // Debug-friendly
1778                 $GLOBALS['wgShowExceptionDetails'] = true;
1779                 // Don't break forms
1780                 $GLOBALS['wgExternalLinkTarget'] = '_blank';
1781
1782                 // Extended debugging
1783                 $GLOBALS['wgShowSQLErrors'] = true;
1784                 $GLOBALS['wgShowDBErrorBacktrace'] = true;
1785
1786                 // Allow multiple ob_flush() calls
1787                 $GLOBALS['wgDisableOutputCompression'] = true;
1788
1789                 // Use a sensible cookie prefix (not my_wiki)
1790                 $GLOBALS['wgCookiePrefix'] = 'mw_installer';
1791
1792                 // Some of the environment checks make shell requests, remove limits
1793                 $GLOBALS['wgMaxShellMemory'] = 0;
1794         }
1795
1796         /**
1797          * Add an installation step following the given step.
1798          *
1799          * @param callable $callback A valid installation callback array, in this form:
1800          *    array( 'name' => 'some-unique-name', 'callback' => array( $obj, 'function' ) );
1801          * @param string $findStep The step to find. Omit to put the step at the beginning
1802          */
1803         public function addInstallStep( $callback, $findStep = 'BEGINNING' ) {
1804                 $this->extraInstallSteps[$findStep][] = $callback;
1805         }
1806
1807         /**
1808          * Disable the time limit for execution.
1809          * Some long-running pages (Install, Upgrade) will want to do this
1810          */
1811         protected function disableTimeLimit() {
1812                 wfSuppressWarnings();
1813                 set_time_limit( 0 );
1814                 wfRestoreWarnings();
1815         }
1816 }