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                 'envCheckMagicSybase',
 123                 'envCheckMbstring',
 124                 'envCheckSafeMode',
 125                 'envCheckXML',
 126                 'envCheckPCRE',
 127                 'envCheckMemory',
 128                 'envCheckCache',
 129                 'envCheckModSecurity',
 130                 'envCheckDiff3',
 131                 'envCheckGraphics',
 132                 'envCheckGit',
 133                 'envCheckServer',
 134                 'envCheckPath',
 135                 'envCheckShellLocale',
 136                 'envCheckUploadsDirectory',
 137                 'envCheckLibicu',
 138                 'envCheckSuhosinMaxValueLength',
 139                 'envCheckCtype',
 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          * Shows messages to the user through a Status object
 356          * @param Status $status
 357          */
 358         public function showStatusMessage( Status $status ) {
 359                 $errors = array_merge( $status->getErrorsArray(), $status->getWarningsArray() );
 360                 if ( $errors ) {
 361                         foreach ( $errors as $error ) {
 362                                 call_user_func( 'showMessage', $error );
 363                         }
 364                 }
 365         }
 366
 367         /**
 368          * Constructor, always call this from child classes.
 369          */
 370         public function __construct() {
 371                 global $wgMessagesDirs, $wgUser;
 372
 373                 // Disable the i18n cache
 374                 Language::getLocalisationCache()->disableBackend();
 375                 // Disable LoadBalancer and wfGetDB etc.
 376                 LBFactory::disableBackend();
 377
 378                 // Disable object cache (otherwise CACHE_ANYTHING will try CACHE_DB and
 379                 // SqlBagOStuff will then throw since we just disabled wfGetDB)
 380                 $GLOBALS['wgMemc'] = new EmptyBagOStuff;
 381                 ObjectCache::clear();
 382                 $emptyCache = array( 'class' => 'EmptyBagOStuff' );
 383                 $GLOBALS['wgObjectCaches'] = array(
 384                         CACHE_NONE => $emptyCache,
 385                         CACHE_DB => $emptyCache,
 386                         CACHE_ANYTHING => $emptyCache,
 387                         CACHE_MEMCACHED => $emptyCache,
 388                 );
 389
 390                 // Load the installer's i18n.
 391                 $wgMessagesDirs['MediawikiInstaller'] = __DIR__ . '/i18n';
 392
 393                 // Having a user with id = 0 safeguards us from DB access via User::loadOptions().
 394                 $wgUser = User::newFromId( 0 );
 395
 396                 $this->settings = $this->internalDefaults;
 397
 398                 foreach ( $this->defaultVarNames as $var ) {
 399                         $this->settings[$var] = $GLOBALS[$var];
 400                 }
 401
 402                 $this->doEnvironmentPreps();
 403
 404                 $this->compiledDBs = array();
 405                 foreach ( self::getDBTypes() as $type ) {
 406                         $installer = $this->getDBInstaller( $type );
 407
 408                         if ( !$installer->isCompiled() ) {
 409                                 continue;
 410                         }
 411                         $this->compiledDBs[] = $type;
 412                 }
 413
 414                 $this->parserTitle = Title::newFromText( 'Installer' );
 415                 $this->parserOptions = new ParserOptions; // language will be wrong :(
 416                 $this->parserOptions->setEditSection( false );
 417         }
 418
 419         /**
 420          * Get a list of known DB types.
 421          *
 422          * @return array
 423          */
 424         public static function getDBTypes() {
 425                 return self::$dbTypes;
 426         }
 427
 428         /**
 429          * Do initial checks of the PHP environment. Set variables according to
 430          * the observed environment.
 431          *
 432          * It's possible that this may be called under the CLI SAPI, not the SAPI
 433          * that the wiki will primarily run under. In that case, the subclass should
 434          * initialise variables such as wgScriptPath, before calling this function.
 435          *
 436          * Under the web subclass, it can already be assumed that PHP 5+ is in use
 437          * and that sessions are working.
 438          *
 439          * @return Status
 440          */
 441         public function doEnvironmentChecks() {
 442                 // Php version has already been checked by entry scripts
 443                 // Show message here for information purposes
 444                 $this->showMessage( 'config-env-php', PHP_VERSION );
 445
 446                 $good = true;
 447                 // Must go here because an old version of PCRE can prevent other checks from completing
 448                 list( $pcreVersion ) = explode( ' ', PCRE_VERSION, 2 );
 449                 if ( version_compare( $pcreVersion, self::MINIMUM_PCRE_VERSION, '<' ) ) {
 450                         $this->showError( 'config-pcre-old', self::MINIMUM_PCRE_VERSION, $pcreVersion );
 451                         $good = false;
 452                 } else {
 453                         foreach ( $this->envChecks as $check ) {
 454                                 $status = $this->$check();
 455                                 if ( $status === false ) {
 456                                         $good = false;
 457                                 }
 458                         }
 459                 }
 460
 461                 $this->setVar( '_Environment', $good );
 462
 463                 return $good ? Status::newGood() : Status::newFatal( 'config-env-bad' );
 464         }
 465
 466         public function doEnvironmentPreps() {
 467                 foreach ( $this->envPreps as $prep ) {
 468                         $this->$prep();
 469                 }
 470         }
 471
 472         /**
 473          * Set a MW configuration variable, or internal installer configuration variable.
 474          *
 475          * @param string $name
 476          * @param mixed $value
 477          */
 478         public function setVar( $name, $value ) {
 479                 $this->settings[$name] = $value;
 480         }
 481
 482         /**
 483          * Get an MW configuration variable, or internal installer configuration variable.
 484          * The defaults come from $GLOBALS (ultimately DefaultSettings.php).
 485          * Installer variables are typically prefixed by an underscore.
 486          *
 487          * @param string $name
 488          * @param mixed $default
 489          *
 490          * @return mixed
 491          */
 492         public function getVar( $name, $default = null ) {
 493                 if ( !isset( $this->settings[$name] ) ) {
 494                         return $default;
 495                 } else {
 496                         return $this->settings[$name];
 497                 }
 498         }
 499
 500         /**
 501          * Get a list of DBs supported by current PHP setup
 502          *
 503          * @return array
 504          */
 505         public function getCompiledDBs() {
 506                 return $this->compiledDBs;
 507         }
 508
 509         /**
 510          * Get an instance of DatabaseInstaller for the specified DB type.
 511          *
 512          * @param mixed $type DB installer for which is needed, false to use default.
 513          *
 514          * @return DatabaseInstaller
 515          */
 516         public function getDBInstaller( $type = false ) {
 517                 if ( !$type ) {
 518                         $type = $this->getVar( 'wgDBtype' );
 519                 }
 520
 521                 $type = strtolower( $type );
 522
 523                 if ( !isset( $this->dbInstallers[$type] ) ) {
 524                         $class = ucfirst( $type ) . 'Installer';
 525                         $this->dbInstallers[$type] = new $class( $this );
 526                 }
 527
 528                 return $this->dbInstallers[$type];
 529         }
 530
 531         /**
 532          * Determine if LocalSettings.php exists. If it does, return its variables.
 533          *
 534          * @return array
 535          */
 536         public static function getExistingLocalSettings() {
 537                 global $IP;
 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_runtime.
 765          * @return bool
 766          */
 767         protected function envCheckMagicQuotes() {
 768                 if ( wfIniGetBool( "magic_quotes_runtime" ) ) {
 769                         $this->showError( 'config-magic-quotes-runtime' );
 770
 771                         return false;
 772                 }
 773
 774                 return true;
 775         }
 776
 777         /**
 778          * Environment check for magic_quotes_sybase.
 779          * @return bool
 780          */
 781         protected function envCheckMagicSybase() {
 782                 if ( wfIniGetBool( 'magic_quotes_sybase' ) ) {
 783                         $this->showError( 'config-magic-quotes-sybase' );
 784
 785                         return false;
 786                 }
 787
 788                 return true;
 789         }
 790
 791         /**
 792          * Environment check for mbstring.func_overload.
 793          * @return bool
 794          */
 795         protected function envCheckMbstring() {
 796                 if ( wfIniGetBool( 'mbstring.func_overload' ) ) {
 797                         $this->showError( 'config-mbstring' );
 798
 799                         return false;
 800                 }
 801
 802                 return true;
 803         }
 804
 805         /**
 806          * Environment check for safe_mode.
 807          * @return bool
 808          */
 809         protected function envCheckSafeMode() {
 810                 if ( wfIniGetBool( 'safe_mode' ) ) {
 811                         $this->setVar( '_SafeMode', true );
 812                         $this->showMessage( 'config-safe-mode' );
 813                 }
 814
 815                 return true;
 816         }
 817
 818         /**
 819          * Environment check for the XML module.
 820          * @return bool
 821          */
 822         protected function envCheckXML() {
 823                 if ( !function_exists( "utf8_encode" ) ) {
 824                         $this->showError( 'config-xml-bad' );
 825
 826                         return false;
 827                 }
 828
 829                 return true;
 830         }
 831
 832         /**
 833          * Environment check for the PCRE module.
 834          *
 835          * @note If this check were to fail, the parser would
 836          *   probably throw an exception before the result
 837          *   of this check is shown to the user.
 838          * @return bool
 839          */
 840         protected function envCheckPCRE() {
 841                 wfSuppressWarnings();
 842                 $regexd = preg_replace( '/[\x{0430}-\x{04FF}]/iu', '', '-АБВГД-' );
 843                 // Need to check for \p support too, as PCRE can be compiled
 844                 // with utf8 support, but not unicode property support.
 845                 // check that \p{Zs} (space separators) matches
 846                 // U+3000 (Ideographic space)
 847                 $regexprop = preg_replace( '/\p{Zs}/u', '', "-\xE3\x80\x80-" );
 848                 wfRestoreWarnings();
 849                 if ( $regexd != '--' || $regexprop != '--' ) {
 850                         $this->showError( 'config-pcre-no-utf8' );
 851
 852                         return false;
 853                 }
 854
 855                 return true;
 856         }
 857
 858         /**
 859          * Environment check for available memory.
 860          * @return bool
 861          */
 862         protected function envCheckMemory() {
 863                 $limit = ini_get( 'memory_limit' );
 864
 865                 if ( !$limit || $limit == -1 ) {
 866                         return true;
 867                 }
 868
 869                 $n = wfShorthandToInteger( $limit );
 870
 871                 if ( $n < $this->minMemorySize * 1024 * 1024 ) {
 872                         $newLimit = "{$this->minMemorySize}M";
 873
 874                         if ( ini_set( "memory_limit", $newLimit ) === false ) {
 875                                 $this->showMessage( 'config-memory-bad', $limit );
 876                         } else {
 877                                 $this->showMessage( 'config-memory-raised', $limit, $newLimit );
 878                                 $this->setVar( '_RaiseMemory', true );
 879                         }
 880                 }
 881
 882                 return true;
 883         }
 884
 885         /**
 886          * Environment check for compiled object cache types.
 887          */
 888         protected function envCheckCache() {
 889                 $caches = array();
 890                 foreach ( $this->objectCaches as $name => $function ) {
 891                         if ( function_exists( $function ) ) {
 892                                 if ( $name == 'xcache' && !wfIniGetBool( 'xcache.var_size' ) ) {
 893                                         continue;
 894                                 }
 895                                 $caches[$name] = true;
 896                         }
 897                 }
 898
 899                 if ( !$caches ) {
 900                         $this->showMessage( 'config-no-cache' );
 901                 }
 902
 903                 $this->setVar( '_Caches', $caches );
 904         }
 905
 906         /**
 907          * Scare user to death if they have mod_security
 908          * @return bool
 909          */
 910         protected function envCheckModSecurity() {
 911                 if ( self::apacheModulePresent( 'mod_security' ) ) {
 912                         $this->showMessage( 'config-mod-security' );
 913                 }
 914
 915                 return true;
 916         }
 917
 918         /**
 919          * Search for GNU diff3.
 920          * @return bool
 921          */
 922         protected function envCheckDiff3() {
 923                 $names = array( "gdiff3", "diff3", "diff3.exe" );
 924                 $versionInfo = array( '$1 --version 2>&1', 'GNU diffutils' );
 925
 926                 $diff3 = self::locateExecutableInDefaultPaths( $names, $versionInfo );
 927
 928                 if ( $diff3 ) {
 929                         $this->setVar( 'wgDiff3', $diff3 );
 930                 } else {
 931                         $this->setVar( 'wgDiff3', false );
 932                         $this->showMessage( 'config-diff3-bad' );
 933                 }
 934
 935                 return true;
 936         }
 937
 938         /**
 939          * Environment check for ImageMagick and GD.
 940          * @return bool
 941          */
 942         protected function envCheckGraphics() {
 943                 $names = array( wfIsWindows() ? 'convert.exe' : 'convert' );
 944                 $versionInfo = array( '$1 -version', 'ImageMagick' );
 945                 $convert = self::locateExecutableInDefaultPaths( $names, $versionInfo );
 946
 947                 $this->setVar( 'wgImageMagickConvertCommand', '' );
 948                 if ( $convert ) {
 949                         $this->setVar( 'wgImageMagickConvertCommand', $convert );
 950                         $this->showMessage( 'config-imagemagick', $convert );
 951
 952                         return true;
 953                 } elseif ( function_exists( 'imagejpeg' ) ) {
 954                         $this->showMessage( 'config-gd' );
 955                 } else {
 956                         $this->showMessage( 'config-no-scaling' );
 957                 }
 958
 959                 return true;
 960         }
 961
 962         /**
 963          * Search for git.
 964          *
 965          * @since 1.22
 966          * @return bool
 967          */
 968         protected function envCheckGit() {
 969                 $names = array( wfIsWindows() ? 'git.exe' : 'git' );
 970                 $versionInfo = array( '$1 --version', 'git version' );
 971
 972                 $git = self::locateExecutableInDefaultPaths( $names, $versionInfo );
 973
 974                 if ( $git ) {
 975                         $this->setVar( 'wgGitBin', $git );
 976                         $this->showMessage( 'config-git', $git );
 977                 } else {
 978                         $this->setVar( 'wgGitBin', false );
 979                         $this->showMessage( 'config-git-bad' );
 980                 }
 981
 982                 return true;
 983         }
 984
 985         /**
 986          * Environment check to inform user which server we've assumed.
 987          *
 988          * @return bool
 989          */
 990         protected function envCheckServer() {
 991                 $server = $this->envGetDefaultServer();
 992                 if ( $server !== null ) {
 993                         $this->showMessage( 'config-using-server', $server );
 994                 }
 995                 return true;
 996         }
 997
 998         /**
 999          * Environment check to inform user which paths we've assumed.
1000          *
1001          * @return bool
1002          */
1003         protected function envCheckPath() {
1004                 $this->showMessage(
1005                         'config-using-uri',
1006                         $this->getVar( 'wgServer' ),
1007                         $this->getVar( 'wgScriptPath' )
1008                 );
1009                 return true;
1010         }
1011
1012         /**
1013          * Environment check for preferred locale in shell
1014          * @return bool
1015          */
1016         protected function envCheckShellLocale() {
1017                 $os = php_uname( 's' );
1018                 $supported = array( 'Linux', 'SunOS', 'HP-UX', 'Darwin' ); # Tested these
1019
1020                 if ( !in_array( $os, $supported ) ) {
1021                         return true;
1022                 }
1023
1024                 # Get a list of available locales.
1025                 $ret = false;
1026                 $lines = wfShellExec( '/usr/bin/locale -a', $ret );
1027
1028                 if ( $ret ) {
1029                         return true;
1030                 }
1031
1032                 $lines = array_map( 'trim', explode( "\n", $lines ) );
1033                 $candidatesByLocale = array();
1034                 $candidatesByLang = array();
1035
1036                 foreach ( $lines as $line ) {
1037                         if ( $line === '' ) {
1038                                 continue;
1039                         }
1040
1041                         if ( !preg_match( '/^([a-zA-Z]+)(_[a-zA-Z]+|)\.(utf8|UTF-8)(@[a-zA-Z_]*|)$/i', $line, $m ) ) {
1042                                 continue;
1043                         }
1044
1045                         list( , $lang, , , ) = $m;
1046
1047                         $candidatesByLocale[$m[0]] = $m;
1048                         $candidatesByLang[$lang][] = $m;
1049                 }
1050
1051                 # Try the current value of LANG.
1052                 if ( isset( $candidatesByLocale[getenv( 'LANG' )] ) ) {
1053                         $this->setVar( 'wgShellLocale', getenv( 'LANG' ) );
1054
1055                         return true;
1056                 }
1057
1058                 # Try the most common ones.
1059                 $commonLocales = array( 'en_US.UTF-8', 'en_US.utf8', 'de_DE.UTF-8', 'de_DE.utf8' );
1060                 foreach ( $commonLocales as $commonLocale ) {
1061                         if ( isset( $candidatesByLocale[$commonLocale] ) ) {
1062                                 $this->setVar( 'wgShellLocale', $commonLocale );
1063
1064                                 return true;
1065                         }
1066                 }
1067
1068                 # Is there an available locale in the Wiki's language?
1069                 $wikiLang = $this->getVar( 'wgLanguageCode' );
1070
1071                 if ( isset( $candidatesByLang[$wikiLang] ) ) {
1072                         $m = reset( $candidatesByLang[$wikiLang] );
1073                         $this->setVar( 'wgShellLocale', $m[0] );
1074
1075                         return true;
1076                 }
1077
1078                 # Are there any at all?
1079                 if ( count( $candidatesByLocale ) ) {
1080                         $m = reset( $candidatesByLocale );
1081                         $this->setVar( 'wgShellLocale', $m[0] );
1082
1083                         return true;
1084                 }
1085
1086                 # Give up.
1087                 return true;
1088         }
1089
1090         /**
1091          * Environment check for the permissions of the uploads directory
1092          * @return bool
1093          */
1094         protected function envCheckUploadsDirectory() {
1095                 global $IP;
1096
1097                 $dir = $IP . '/images/';
1098                 $url = $this->getVar( 'wgServer' ) . $this->getVar( 'wgScriptPath' ) . '/images/';
1099                 $safe = !$this->dirIsExecutable( $dir, $url );
1100
1101                 if ( !$safe ) {
1102                         $this->showMessage( 'config-uploads-not-safe', $dir );
1103                 }
1104
1105                 return true;
1106         }
1107
1108         /**
1109          * Checks if suhosin.get.max_value_length is set, and if so generate
1110          * a warning because it decreases ResourceLoader performance.
1111          * @return bool
1112          */
1113         protected function envCheckSuhosinMaxValueLength() {
1114                 $maxValueLength = ini_get( 'suhosin.get.max_value_length' );
1115                 if ( $maxValueLength > 0 && $maxValueLength < 1024 ) {
1116                         // Only warn if the value is below the sane 1024
1117                         $this->showMessage( 'config-suhosin-max-value-length', $maxValueLength );
1118                 }
1119
1120                 return true;
1121         }
1122
1123         /**
1124          * Convert a hex string representing a Unicode code point to that code point.
1125          * @param string $c
1126          * @return string
1127          */
1128         protected function unicodeChar( $c ) {
1129                 $c = hexdec( $c );
1130                 if ( $c <= 0x7F ) {
1131                         return chr( $c );
1132                 } elseif ( $c <= 0x7FF ) {
1133                         return chr( 0xC0 | $c >> 6 ) . chr( 0x80 | $c & 0x3F );
1134                 } elseif ( $c <= 0xFFFF ) {
1135                         return chr( 0xE0 | $c >> 12 ) . chr( 0x80 | $c >> 6 & 0x3F )
1136                         . chr( 0x80 | $c & 0x3F );
1137                 } elseif ( $c <= 0x10FFFF ) {
1138                         return chr( 0xF0 | $c >> 18 ) . chr( 0x80 | $c >> 12 & 0x3F )
1139                         . chr( 0x80 | $c >> 6 & 0x3F )
1140                         . chr( 0x80 | $c & 0x3F );
1141                 } else {
1142                         return false;
1143                 }
1144         }
1145
1146         /**
1147          * Check the libicu version
1148          */
1149         protected function envCheckLibicu() {
1150                 $utf8 = function_exists( 'utf8_normalize' );
1151                 $intl = function_exists( 'normalizer_normalize' );
1152
1153                 /**
1154                  * This needs to be updated something that the latest libicu
1155                  * will properly normalize.  This normalization was found at
1156                  * http://www.unicode.org/versions/Unicode5.2.0/#Character_Additions
1157                  * Note that we use the hex representation to create the code
1158                  * points in order to avoid any Unicode-destroying during transit.
1159                  */
1160                 $not_normal_c = $this->unicodeChar( "FA6C" );
1161                 $normal_c = $this->unicodeChar( "242EE" );
1162
1163                 $useNormalizer = 'php';
1164                 $needsUpdate = false;
1165
1166                 /**
1167                  * We're going to prefer the pecl extension here unless
1168                  * utf8_normalize is more up to date.
1169                  */
1170                 if ( $utf8 ) {
1171                         $useNormalizer = 'utf8';
1172                         $utf8 = utf8_normalize( $not_normal_c, UtfNormal::UNORM_NFC );
1173                         if ( $utf8 !== $normal_c ) {
1174                                 $needsUpdate = true;
1175                         }
1176                 }
1177                 if ( $intl ) {
1178                         $useNormalizer = 'intl';
1179                         $intl = normalizer_normalize( $not_normal_c, Normalizer::FORM_C );
1180                         if ( $intl !== $normal_c ) {
1181                                 $needsUpdate = true;
1182                         }
1183                 }
1184
1185                 // Uses messages 'config-unicode-using-php', 'config-unicode-using-utf8',
1186                 // 'config-unicode-using-intl'
1187                 if ( $useNormalizer === 'php' ) {
1188                         $this->showMessage( 'config-unicode-pure-php-warning' );
1189                 } else {
1190                         $this->showMessage( 'config-unicode-using-' . $useNormalizer );
1191                         if ( $needsUpdate ) {
1192                                 $this->showMessage( 'config-unicode-update-warning' );
1193                         }
1194                 }
1195         }
1196
1197         /**
1198          * @return bool
1199          */
1200         protected function envCheckCtype() {
1201                 if ( !function_exists( 'ctype_digit' ) ) {
1202                         $this->showError( 'config-ctype' );
1203
1204                         return false;
1205                 }
1206
1207                 return true;
1208         }
1209
1210         /**
1211          * @return bool
1212          */
1213         protected function envCheckJSON() {
1214                 if ( !function_exists( 'json_decode' ) ) {
1215                         $this->showError( 'config-json' );
1216
1217                         return false;
1218                 }
1219
1220                 return true;
1221         }
1222
1223         /**
1224          * Environment prep for the server hostname.
1225          */
1226         protected function envPrepServer() {
1227                 $server = $this->envGetDefaultServer();
1228                 if ( $server !== null ) {
1229                         $this->setVar( 'wgServer', $server );
1230                 }
1231         }
1232
1233         /**
1234          * Helper function to be called from envPrepServer()
1235          * @return string
1236          */
1237         abstract protected function envGetDefaultServer();
1238
1239         /**
1240          * Environment prep for setting the preferred PHP file extension.
1241          */
1242         protected function envPrepExtension() {
1243                 // @todo FIXME: Detect this properly
1244                 if ( defined( 'MW_INSTALL_PHP5_EXT' ) ) {
1245                         $ext = '.php5';
1246                 } else {
1247                         $ext = '.php';
1248                 }
1249                 $this->setVar( 'wgScriptExtension', $ext );
1250         }
1251
1252         /**
1253          * Environment prep for setting $IP and $wgScriptPath.
1254          */
1255         protected function envPrepPath() {
1256                 global $IP;
1257                 $IP = dirname( dirname( __DIR__ ) );
1258                 $this->setVar( 'IP', $IP );
1259         }
1260
1261         /**
1262          * Get an array of likely places we can find executables. Check a bunch
1263          * of known Unix-like defaults, as well as the PATH environment variable
1264          * (which should maybe make it work for Windows?)
1265          *
1266          * @return array
1267          */
1268         protected static function getPossibleBinPaths() {
1269                 return array_merge(
1270                         array( '/usr/bin', '/usr/local/bin', '/opt/csw/bin',
1271                                 '/usr/gnu/bin', '/usr/sfw/bin', '/sw/bin', '/opt/local/bin' ),
1272                         explode( PATH_SEPARATOR, getenv( 'PATH' ) )
1273                 );
1274         }
1275
1276         /**
1277          * Search a path for any of the given executable names. Returns the
1278          * executable name if found. Also checks the version string returned
1279          * by each executable.
1280          *
1281          * Used only by environment checks.
1282          *
1283          * @param string $path path to search
1284          * @param array $names of executable names
1285          * @param array|bool $versionInfo False or array with two members:
1286          *   0 => Command to run for version check, with $1 for the full executable name
1287          *   1 => String to compare the output with
1288          *
1289          * If $versionInfo is not false, only executables with a version
1290          * matching $versionInfo[1] will be returned.
1291          * @return bool|string
1292          */
1293         public static function locateExecutable( $path, $names, $versionInfo = false ) {
1294                 if ( !is_array( $names ) ) {
1295                         $names = array( $names );
1296                 }
1297
1298                 foreach ( $names as $name ) {
1299                         $command = $path . DIRECTORY_SEPARATOR . $name;
1300
1301                         wfSuppressWarnings();
1302                         $file_exists = file_exists( $command );
1303                         wfRestoreWarnings();
1304
1305                         if ( $file_exists ) {
1306                                 if ( !$versionInfo ) {
1307                                         return $command;
1308                                 }
1309
1310                                 $file = str_replace( '$1', wfEscapeShellArg( $command ), $versionInfo[0] );
1311                                 if ( strstr( wfShellExec( $file ), $versionInfo[1] ) !== false ) {
1312                                         return $command;
1313                                 }
1314                         }
1315                 }
1316
1317                 return false;
1318         }
1319
1320         /**
1321          * Same as locateExecutable(), but checks in getPossibleBinPaths() by default
1322          * @see locateExecutable()
1323          * @param array $names Array of possible names.
1324          * @param array|bool $versionInfo Default: false or array with two members:
1325          *   0 => Command to run for version check, with $1 for the full executable name
1326          *   1 => String to compare the output with
1327          *
1328          * If $versionInfo is not false, only executables with a version
1329          * matching $versionInfo[1] will be returned.
1330          * @return bool|string
1331          */
1332         public static function locateExecutableInDefaultPaths( $names, $versionInfo = false ) {
1333                 foreach ( self::getPossibleBinPaths() as $path ) {
1334                         $exe = self::locateExecutable( $path, $names, $versionInfo );
1335                         if ( $exe !== false ) {
1336                                 return $exe;
1337                         }
1338                 }
1339
1340                 return false;
1341         }
1342
1343         /**
1344          * Checks if scripts located in the given directory can be executed via the given URL.
1345          *
1346          * Used only by environment checks.
1347          * @param string $dir
1348          * @param string $url
1349          * @return bool|int|string
1350          */
1351         public function dirIsExecutable( $dir, $url ) {
1352                 $scriptTypes = array(
1353                         'php' => array(
1354                                 "<?php echo 'ex' . 'ec';",
1355                                 "#!/var/env php5\n<?php echo 'ex' . 'ec';",
1356                         ),
1357                 );
1358
1359                 // it would be good to check other popular languages here, but it'll be slow.
1360
1361                 wfSuppressWarnings();
1362
1363                 foreach ( $scriptTypes as $ext => $contents ) {
1364                         foreach ( $contents as $source ) {
1365                                 $file = 'exectest.' . $ext;
1366
1367                                 if ( !file_put_contents( $dir . $file, $source ) ) {
1368                                         break;
1369                                 }
1370
1371                                 try {
1372                                         $text = Http::get( $url . $file, array( 'timeout' => 3 ) );
1373                                 } catch ( MWException $e ) {
1374                                         // Http::get throws with allow_url_fopen = false and no curl extension.
1375                                         $text = null;
1376                                 }
1377                                 unlink( $dir . $file );
1378
1379                                 if ( $text == 'exec' ) {
1380                                         wfRestoreWarnings();
1381
1382                                         return $ext;
1383                                 }
1384                         }
1385                 }
1386
1387                 wfRestoreWarnings();
1388
1389                 return false;
1390         }
1391
1392         /**
1393          * Checks for presence of an Apache module. Works only if PHP is running as an Apache module, too.
1394          *
1395          * @param string $moduleName Name of module to check.
1396          * @return bool
1397          */
1398         public static function apacheModulePresent( $moduleName ) {
1399                 if ( function_exists( 'apache_get_modules' ) && in_array( $moduleName, apache_get_modules() ) ) {
1400                         return true;
1401                 }
1402                 // try it the hard way
1403                 ob_start();
1404                 phpinfo( INFO_MODULES );
1405                 $info = ob_get_clean();
1406
1407                 return strpos( $info, $moduleName ) !== false;
1408         }
1409
1410         /**
1411          * ParserOptions are constructed before we determined the language, so fix it
1412          *
1413          * @param Language $lang
1414          */
1415         public function setParserLanguage( $lang ) {
1416                 $this->parserOptions->setTargetLanguage( $lang );
1417                 $this->parserOptions->setUserLang( $lang );
1418         }
1419
1420         /**
1421          * Overridden by WebInstaller to provide lastPage parameters.
1422          * @param string $page
1423          * @return string
1424          */
1425         protected function getDocUrl( $page ) {
1426                 return "{$_SERVER['PHP_SELF']}?page=" . urlencode( $page );
1427         }
1428
1429         /**
1430          * Finds extensions that follow the format /$directory/Name/Name.php,
1431          * and returns an array containing the value for 'Name' for each found extension.
1432          *
1433          * Reasonable values for $directory include 'extensions' (the default) and 'skins'.
1434          *
1435          * @param string $directory Directory to search in
1436          * @return array
1437          */
1438         public function findExtensions( $directory = 'extensions' ) {
1439                 if ( $this->getVar( 'IP' ) === null ) {
1440                         return array();
1441                 }
1442
1443                 $extDir = $this->getVar( 'IP' ) . '/' . $directory;
1444                 if ( !is_readable( $extDir ) || !is_dir( $extDir ) ) {
1445                         return array();
1446                 }
1447
1448                 $dh = opendir( $extDir );
1449                 $exts = array();
1450                 while ( ( $file = readdir( $dh ) ) !== false ) {
1451                         if ( !is_dir( "$extDir/$file" ) ) {
1452                                 continue;
1453                         }
1454                         if ( file_exists( "$extDir/$file/$file.php" ) ) {
1455                                 $exts[] = $file;
1456                         }
1457                 }
1458                 closedir( $dh );
1459                 natcasesort( $exts );
1460
1461                 return $exts;
1462         }
1463
1464         /**
1465          * Installs the auto-detected extensions.
1466          *
1467          * @return Status
1468          */
1469         protected function includeExtensions() {
1470                 global $IP;
1471                 $exts = $this->getVar( '_Extensions' );
1472                 $IP = $this->getVar( 'IP' );
1473
1474                 /**
1475                  * We need to include DefaultSettings before including extensions to avoid
1476                  * warnings about unset variables. However, the only thing we really
1477                  * want here is $wgHooks['LoadExtensionSchemaUpdates']. This won't work
1478                  * if the extension has hidden hook registration in $wgExtensionFunctions,
1479                  * but we're not opening that can of worms
1480                  * @see https://bugzilla.wikimedia.org/show_bug.cgi?id=26857
1481                  */
1482                 global $wgAutoloadClasses;
1483                 $wgAutoloadClasses = array();
1484
1485                 require "$IP/includes/DefaultSettings.php";
1486
1487                 foreach ( $exts as $e ) {
1488                         require_once "$IP/extensions/$e/$e.php";
1489                 }
1490
1491                 $hooksWeWant = isset( $wgHooks['LoadExtensionSchemaUpdates'] ) ?
1492                         $wgHooks['LoadExtensionSchemaUpdates'] : array();
1493
1494                 // Unset everyone else's hooks. Lord knows what someone might be doing
1495                 // in ParserFirstCallInit (see bug 27171)
1496                 $GLOBALS['wgHooks'] = array( 'LoadExtensionSchemaUpdates' => $hooksWeWant );
1497
1498                 return Status::newGood();
1499         }
1500
1501         /**
1502          * Get an array of install steps. Should always be in the format of
1503          * array(
1504          *   'name'     => 'someuniquename',
1505          *   'callback' => array( $obj, 'method' ),
1506          * )
1507          * There must be a config-install-$name message defined per step, which will
1508          * be shown on install.
1509          *
1510          * @param DatabaseInstaller $installer DatabaseInstaller so we can make callbacks
1511          * @return array
1512          */
1513         protected function getInstallSteps( DatabaseInstaller $installer ) {
1514                 $coreInstallSteps = array(
1515                         array( 'name' => 'database', 'callback' => array( $installer, 'setupDatabase' ) ),
1516                         array( 'name' => 'tables', 'callback' => array( $installer, 'createTables' ) ),
1517                         array( 'name' => 'interwiki', 'callback' => array( $installer, 'populateInterwikiTable' ) ),
1518                         array( 'name' => 'stats', 'callback' => array( $this, 'populateSiteStats' ) ),
1519                         array( 'name' => 'keys', 'callback' => array( $this, 'generateKeys' ) ),
1520                         array( 'name' => 'sysop', 'callback' => array( $this, 'createSysop' ) ),
1521                         array( 'name' => 'mainpage', 'callback' => array( $this, 'createMainpage' ) ),
1522                 );
1523
1524                 // Build the array of install steps starting from the core install list,
1525                 // then adding any callbacks that wanted to attach after a given step
1526                 foreach ( $coreInstallSteps as $step ) {
1527                         $this->installSteps[] = $step;
1528                         if ( isset( $this->extraInstallSteps[$step['name']] ) ) {
1529                                 $this->installSteps = array_merge(
1530                                         $this->installSteps,
1531                                         $this->extraInstallSteps[$step['name']]
1532                                 );
1533                         }
1534                 }
1535
1536                 // Prepend any steps that want to be at the beginning
1537                 if ( isset( $this->extraInstallSteps['BEGINNING'] ) ) {
1538                         $this->installSteps = array_merge(
1539                                 $this->extraInstallSteps['BEGINNING'],
1540                                 $this->installSteps
1541                         );
1542                 }
1543
1544                 // Extensions should always go first, chance to tie into hooks and such
1545                 if ( count( $this->getVar( '_Extensions' ) ) ) {
1546                         array_unshift( $this->installSteps,
1547                                 array( 'name' => 'extensions', 'callback' => array( $this, 'includeExtensions' ) )
1548                         );
1549                         $this->installSteps[] = array(
1550                                 'name' => 'extension-tables',
1551                                 'callback' => array( $installer, 'createExtensionTables' )
1552                         );
1553                 }
1554
1555                 return $this->installSteps;
1556         }
1557
1558         /**
1559          * Actually perform the installation.
1560          *
1561          * @param callable $startCB A callback array for the beginning of each step
1562          * @param callable $endCB A callback array for the end of each step
1563          *
1564          * @return array Array of Status objects
1565          */
1566         public function performInstallation( $startCB, $endCB ) {
1567                 $installResults = array();
1568                 $installer = $this->getDBInstaller();
1569                 $installer->preInstall();
1570                 $steps = $this->getInstallSteps( $installer );
1571                 foreach ( $steps as $stepObj ) {
1572                         $name = $stepObj['name'];
1573                         call_user_func_array( $startCB, array( $name ) );
1574
1575                         // Perform the callback step
1576                         $status = call_user_func( $stepObj['callback'], $installer );
1577
1578                         // Output and save the results
1579                         call_user_func( $endCB, $name, $status );
1580                         $installResults[$name] = $status;
1581
1582                         // If we've hit some sort of fatal, we need to bail.
1583                         // Callback already had a chance to do output above.
1584                         if ( !$status->isOk() ) {
1585                                 break;
1586                         }
1587                 }
1588                 if ( $status->isOk() ) {
1589                         $this->setVar( '_InstallDone', true );
1590                 }
1591
1592                 return $installResults;
1593         }
1594
1595         /**
1596          * Generate $wgSecretKey. Will warn if we had to use an insecure random source.
1597          *
1598          * @return Status
1599          */
1600         public function generateKeys() {
1601                 $keys = array( 'wgSecretKey' => 64 );
1602                 if ( strval( $this->getVar( 'wgUpgradeKey' ) ) === '' ) {
1603                         $keys['wgUpgradeKey'] = 16;
1604                 }
1605
1606                 return $this->doGenerateKeys( $keys );
1607         }
1608
1609         /**
1610          * Generate a secret value for variables using our CryptRand generator.
1611          * Produce a warning if the random source was insecure.
1612          *
1613          * @param array $keys
1614          * @return Status
1615          */
1616         protected function doGenerateKeys( $keys ) {
1617                 $status = Status::newGood();
1618
1619                 $strong = true;
1620                 foreach ( $keys as $name => $length ) {
1621                         $secretKey = MWCryptRand::generateHex( $length, true );
1622                         if ( !MWCryptRand::wasStrong() ) {
1623                                 $strong = false;
1624                         }
1625
1626                         $this->setVar( $name, $secretKey );
1627                 }
1628
1629                 if ( !$strong ) {
1630                         $names = array_keys( $keys );
1631                         $names = preg_replace( '/^(.*)$/', '\$$1', $names );
1632                         global $wgLang;
1633                         $status->warning( 'config-insecure-keys', $wgLang->listToText( $names ), count( $names ) );
1634                 }
1635
1636                 return $status;
1637         }
1638
1639         /**
1640          * Create the first user account, grant it sysop and bureaucrat rights
1641          *
1642          * @return Status
1643          */
1644         protected function createSysop() {
1645                 $name = $this->getVar( '_AdminName' );
1646                 $user = User::newFromName( $name );
1647
1648                 if ( !$user ) {
1649                         // We should've validated this earlier anyway!
1650                         return Status::newFatal( 'config-admin-error-user', $name );
1651                 }
1652
1653                 if ( $user->idForName() == 0 ) {
1654                         $user->addToDatabase();
1655
1656                         try {
1657                                 $user->setPassword( $this->getVar( '_AdminPassword' ) );
1658                         } catch ( PasswordError $pwe ) {
1659                                 return Status::newFatal( 'config-admin-error-password', $name, $pwe->getMessage() );
1660                         }
1661
1662                         $user->addGroup( 'sysop' );
1663                         $user->addGroup( 'bureaucrat' );
1664                         if ( $this->getVar( '_AdminEmail' ) ) {
1665                                 $user->setEmail( $this->getVar( '_AdminEmail' ) );
1666                         }
1667                         $user->saveSettings();
1668
1669                         // Update user count
1670                         $ssUpdate = new SiteStatsUpdate( 0, 0, 0, 0, 1 );
1671                         $ssUpdate->doUpdate();
1672                 }
1673                 $status = Status::newGood();
1674
1675                 if ( $this->getVar( '_Subscribe' ) && $this->getVar( '_AdminEmail' ) ) {
1676                         $this->subscribeToMediaWikiAnnounce( $status );
1677                 }
1678
1679                 return $status;
1680         }
1681
1682         /**
1683          * @param Status $s
1684          */
1685         private function subscribeToMediaWikiAnnounce( Status $s ) {
1686                 $params = array(
1687                         'email' => $this->getVar( '_AdminEmail' ),
1688                         'language' => 'en',
1689                         'digest' => 0
1690                 );
1691
1692                 // Mailman doesn't support as many languages as we do, so check to make
1693                 // sure their selected language is available
1694                 $myLang = $this->getVar( '_UserLang' );
1695                 if ( in_array( $myLang, $this->mediaWikiAnnounceLanguages ) ) {
1696                         $myLang = $myLang == 'pt-br' ? 'pt_BR' : $myLang; // rewrite to Mailman's pt_BR
1697                         $params['language'] = $myLang;
1698                 }
1699
1700                 if ( MWHttpRequest::canMakeRequests() ) {
1701                         $res = MWHttpRequest::factory( $this->mediaWikiAnnounceUrl,
1702                                 array( 'method' => 'POST', 'postData' => $params ) )->execute();
1703                         if ( !$res->isOK() ) {
1704                                 $s->warning( 'config-install-subscribe-fail', $res->getMessage() );
1705                         }
1706                 } else {
1707                         $s->warning( 'config-install-subscribe-notpossible' );
1708                 }
1709         }
1710
1711         /**
1712          * Insert Main Page with default content.
1713          *
1714          * @param DatabaseInstaller $installer
1715          * @return Status
1716          */
1717         protected function createMainpage( DatabaseInstaller $installer ) {
1718                 $status = Status::newGood();
1719                 try {
1720                         $page = WikiPage::factory( Title::newMainPage() );
1721                         $content = new WikitextContent(
1722                                 wfMessage( 'mainpagetext' )->inContentLanguage()->text() . "\n\n" .
1723                                 wfMessage( 'mainpagedocfooter' )->inContentLanguage()->text()
1724                         );
1725
1726                         $page->doEditContent( $content,
1727                                 '',
1728                                 EDIT_NEW,
1729                                 false,
1730                                 User::newFromName( 'MediaWiki default' )
1731                         );
1732                 } catch ( MWException $e ) {
1733                         //using raw, because $wgShowExceptionDetails can not be set yet
1734                         $status->fatal( 'config-install-mainpage-failed', $e->getMessage() );
1735                 }
1736
1737                 return $status;
1738         }
1739
1740         /**
1741          * Override the necessary bits of the config to run an installation.
1742          */
1743         public static function overrideConfig() {
1744                 define( 'MW_NO_SESSION', 1 );
1745
1746                 // Don't access the database
1747                 $GLOBALS['wgUseDatabaseMessages'] = false;
1748                 // Don't cache langconv tables
1749                 $GLOBALS['wgLanguageConverterCacheType'] = CACHE_NONE;
1750                 // Debug-friendly
1751                 $GLOBALS['wgShowExceptionDetails'] = true;
1752                 // Don't break forms
1753                 $GLOBALS['wgExternalLinkTarget'] = '_blank';
1754
1755                 // Extended debugging
1756                 $GLOBALS['wgShowSQLErrors'] = true;
1757                 $GLOBALS['wgShowDBErrorBacktrace'] = true;
1758
1759                 // Allow multiple ob_flush() calls
1760                 $GLOBALS['wgDisableOutputCompression'] = true;
1761
1762                 // Use a sensible cookie prefix (not my_wiki)
1763                 $GLOBALS['wgCookiePrefix'] = 'mw_installer';
1764
1765                 // Some of the environment checks make shell requests, remove limits
1766                 $GLOBALS['wgMaxShellMemory'] = 0;
1767
1768                 // Don't bother embedding images into generated CSS, which is not cached
1769                 $GLOBALS['wgResourceLoaderLESSFunctions']['embeddable'] = function ( $frame, $less ) {
1770                         return $less->toBool( false );
1771                 };
1772         }
1773
1774         /**
1775          * Add an installation step following the given step.
1776          *
1777          * @param callable $callback A valid installation callback array, in this form:
1778          *    array( 'name' => 'some-unique-name', 'callback' => array( $obj, 'function' ) );
1779          * @param string $findStep The step to find. Omit to put the step at the beginning
1780          */
1781         public function addInstallStep( $callback, $findStep = 'BEGINNING' ) {
1782                 $this->extraInstallSteps[$findStep][] = $callback;
1783         }
1784
1785         /**
1786          * Disable the time limit for execution.
1787          * Some long-running pages (Install, Upgrade) will want to do this
1788          */
1789         protected function disableTimeLimit() {
1790                 wfSuppressWarnings();
1791                 set_time_limit( 0 );
1792                 wfRestoreWarnings();
1793         }
1794 }