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                 'envCheckIconv',
 141                 'envCheckJSON',
 142         );
 143
 144         /**
 145          * A list of environment preparation methods called by doEnvironmentPreps().
 146          *
 147          * @var array
 148          */
 149         protected $envPreps = array(
 150                 'envPrepExtension',
 151                 'envPrepServer',
 152                 'envPrepPath',
 153         );
 154
 155         /**
 156          * MediaWiki configuration globals that will eventually be passed through
 157          * to LocalSettings.php. The names only are given here, the defaults
 158          * typically come from DefaultSettings.php.
 159          *
 160          * @var array
 161          */
 162         protected $defaultVarNames = array(
 163                 'wgSitename',
 164                 'wgPasswordSender',
 165                 'wgLanguageCode',
 166                 'wgRightsIcon',
 167                 'wgRightsText',
 168                 'wgRightsUrl',
 169                 'wgMainCacheType',
 170                 'wgEnableEmail',
 171                 'wgEnableUserEmail',
 172                 'wgEnotifUserTalk',
 173                 'wgEnotifWatchlist',
 174                 'wgEmailAuthentication',
 175                 'wgDBtype',
 176                 'wgDiff3',
 177                 'wgImageMagickConvertCommand',
 178                 'wgGitBin',
 179                 'IP',
 180                 'wgScriptPath',
 181                 'wgScriptExtension',
 182                 'wgMetaNamespace',
 183                 'wgDeletedDirectory',
 184                 'wgEnableUploads',
 185                 'wgShellLocale',
 186                 'wgSecretKey',
 187                 'wgUseInstantCommons',
 188                 'wgUpgradeKey',
 189                 'wgDefaultSkin',
 190                 'wgResourceLoaderMaxQueryLength',
 191         );
 192
 193         /**
 194          * Variables that are stored alongside globals, and are used for any
 195          * configuration of the installation process aside from the MediaWiki
 196          * configuration. Map of names to defaults.
 197          *
 198          * @var array
 199          */
 200         protected $internalDefaults = array(
 201                 '_UserLang' => 'en',
 202                 '_Environment' => false,
 203                 '_SafeMode' => false,
 204                 '_RaiseMemory' => false,
 205                 '_UpgradeDone' => false,
 206                 '_InstallDone' => false,
 207                 '_Caches' => array(),
 208                 '_InstallPassword' => '',
 209                 '_SameAccount' => true,
 210                 '_CreateDBAccount' => false,
 211                 '_NamespaceType' => 'site-name',
 212                 '_AdminName' => '', // will be set later, when the user selects language
 213                 '_AdminPassword' => '',
 214                 '_AdminPasswordConfirm' => '',
 215                 '_AdminEmail' => '',
 216                 '_Subscribe' => false,
 217                 '_SkipOptional' => 'continue',
 218                 '_RightsProfile' => 'wiki',
 219                 '_LicenseCode' => 'none',
 220                 '_CCDone' => false,
 221                 '_Extensions' => 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 envCheckIconv() {
1214                 if ( !function_exists( 'iconv' ) ) {
1215                         $this->showError( 'config-iconv' );
1216
1217                         return false;
1218                 }
1219
1220                 return true;
1221         }
1222
1223         /**
1224          * @return bool
1225          */
1226         protected function envCheckJSON() {
1227                 if ( !function_exists( 'json_decode' ) ) {
1228                         $this->showError( 'config-json' );
1229
1230                         return false;
1231                 }
1232
1233                 return true;
1234         }
1235
1236         /**
1237          * Environment prep for the server hostname.
1238          */
1239         protected function envPrepServer() {
1240                 $server = $this->envGetDefaultServer();
1241                 if ( $server !== null ) {
1242                         $this->setVar( 'wgServer', $server );
1243                 }
1244         }
1245
1246         /**
1247          * Helper function to be called from envPrepServer()
1248          * @return string
1249          */
1250         abstract protected function envGetDefaultServer();
1251
1252         /**
1253          * Environment prep for setting the preferred PHP file extension.
1254          */
1255         protected function envPrepExtension() {
1256                 // @todo FIXME: Detect this properly
1257                 if ( defined( 'MW_INSTALL_PHP5_EXT' ) ) {
1258                         $ext = '.php5';
1259                 } else {
1260                         $ext = '.php';
1261                 }
1262                 $this->setVar( 'wgScriptExtension', $ext );
1263         }
1264
1265         /**
1266          * Environment prep for setting $IP and $wgScriptPath.
1267          */
1268         protected function envPrepPath() {
1269                 global $IP;
1270                 $IP = dirname( dirname( __DIR__ ) );
1271                 $this->setVar( 'IP', $IP );
1272         }
1273
1274         /**
1275          * Get an array of likely places we can find executables. Check a bunch
1276          * of known Unix-like defaults, as well as the PATH environment variable
1277          * (which should maybe make it work for Windows?)
1278          *
1279          * @return array
1280          */
1281         protected static function getPossibleBinPaths() {
1282                 return array_merge(
1283                         array( '/usr/bin', '/usr/local/bin', '/opt/csw/bin',
1284                                 '/usr/gnu/bin', '/usr/sfw/bin', '/sw/bin', '/opt/local/bin' ),
1285                         explode( PATH_SEPARATOR, getenv( 'PATH' ) )
1286                 );
1287         }
1288
1289         /**
1290          * Search a path for any of the given executable names. Returns the
1291          * executable name if found. Also checks the version string returned
1292          * by each executable.
1293          *
1294          * Used only by environment checks.
1295          *
1296          * @param string $path path to search
1297          * @param array $names of executable names
1298          * @param array|bool $versionInfo False or array with two members:
1299          *   0 => Command to run for version check, with $1 for the full executable name
1300          *   1 => String to compare the output with
1301          *
1302          * If $versionInfo is not false, only executables with a version
1303          * matching $versionInfo[1] will be returned.
1304          * @return bool|string
1305          */
1306         public static function locateExecutable( $path, $names, $versionInfo = false ) {
1307                 if ( !is_array( $names ) ) {
1308                         $names = array( $names );
1309                 }
1310
1311                 foreach ( $names as $name ) {
1312                         $command = $path . DIRECTORY_SEPARATOR . $name;
1313
1314                         wfSuppressWarnings();
1315                         $file_exists = file_exists( $command );
1316                         wfRestoreWarnings();
1317
1318                         if ( $file_exists ) {
1319                                 if ( !$versionInfo ) {
1320                                         return $command;
1321                                 }
1322
1323                                 $file = str_replace( '$1', wfEscapeShellArg( $command ), $versionInfo[0] );
1324                                 if ( strstr( wfShellExec( $file ), $versionInfo[1] ) !== false ) {
1325                                         return $command;
1326                                 }
1327                         }
1328                 }
1329
1330                 return false;
1331         }
1332
1333         /**
1334          * Same as locateExecutable(), but checks in getPossibleBinPaths() by default
1335          * @see locateExecutable()
1336          * @param array $names Array of possible names.
1337          * @param array|bool $versionInfo Default: false or array with two members:
1338          *   0 => Command to run for version check, with $1 for the full executable name
1339          *   1 => String to compare the output with
1340          *
1341          * If $versionInfo is not false, only executables with a version
1342          * matching $versionInfo[1] will be returned.
1343          * @return bool|string
1344          */
1345         public static function locateExecutableInDefaultPaths( $names, $versionInfo = false ) {
1346                 foreach ( self::getPossibleBinPaths() as $path ) {
1347                         $exe = self::locateExecutable( $path, $names, $versionInfo );
1348                         if ( $exe !== false ) {
1349                                 return $exe;
1350                         }
1351                 }
1352
1353                 return false;
1354         }
1355
1356         /**
1357          * Checks if scripts located in the given directory can be executed via the given URL.
1358          *
1359          * Used only by environment checks.
1360          * @param string $dir
1361          * @param string $url
1362          * @return bool|int|string
1363          */
1364         public function dirIsExecutable( $dir, $url ) {
1365                 $scriptTypes = array(
1366                         'php' => array(
1367                                 "<?php echo 'ex' . 'ec';",
1368                                 "#!/var/env php5\n<?php echo 'ex' . 'ec';",
1369                         ),
1370                 );
1371
1372                 // it would be good to check other popular languages here, but it'll be slow.
1373
1374                 wfSuppressWarnings();
1375
1376                 foreach ( $scriptTypes as $ext => $contents ) {
1377                         foreach ( $contents as $source ) {
1378                                 $file = 'exectest.' . $ext;
1379
1380                                 if ( !file_put_contents( $dir . $file, $source ) ) {
1381                                         break;
1382                                 }
1383
1384                                 try {
1385                                         $text = Http::get( $url . $file, array( 'timeout' => 3 ) );
1386                                 } catch ( MWException $e ) {
1387                                         // Http::get throws with allow_url_fopen = false and no curl extension.
1388                                         $text = null;
1389                                 }
1390                                 unlink( $dir . $file );
1391
1392                                 if ( $text == 'exec' ) {
1393                                         wfRestoreWarnings();
1394
1395                                         return $ext;
1396                                 }
1397                         }
1398                 }
1399
1400                 wfRestoreWarnings();
1401
1402                 return false;
1403         }
1404
1405         /**
1406          * Checks for presence of an Apache module. Works only if PHP is running as an Apache module, too.
1407          *
1408          * @param string $moduleName Name of module to check.
1409          * @return bool
1410          */
1411         public static function apacheModulePresent( $moduleName ) {
1412                 if ( function_exists( 'apache_get_modules' ) && in_array( $moduleName, apache_get_modules() ) ) {
1413                         return true;
1414                 }
1415                 // try it the hard way
1416                 ob_start();
1417                 phpinfo( INFO_MODULES );
1418                 $info = ob_get_clean();
1419
1420                 return strpos( $info, $moduleName ) !== false;
1421         }
1422
1423         /**
1424          * ParserOptions are constructed before we determined the language, so fix it
1425          *
1426          * @param Language $lang
1427          */
1428         public function setParserLanguage( $lang ) {
1429                 $this->parserOptions->setTargetLanguage( $lang );
1430                 $this->parserOptions->setUserLang( $lang );
1431         }
1432
1433         /**
1434          * Overridden by WebInstaller to provide lastPage parameters.
1435          * @param string $page
1436          * @return string
1437          */
1438         protected function getDocUrl( $page ) {
1439                 return "{$_SERVER['PHP_SELF']}?page=" . urlencode( $page );
1440         }
1441
1442         /**
1443          * Finds extensions that follow the format /extensions/Name/Name.php,
1444          * and returns an array containing the value for 'Name' for each found extension.
1445          *
1446          * @return array
1447          */
1448         public function findExtensions() {
1449                 if ( $this->getVar( 'IP' ) === null ) {
1450                         return array();
1451                 }
1452
1453                 $extDir = $this->getVar( 'IP' ) . '/extensions';
1454                 if ( !is_readable( $extDir ) || !is_dir( $extDir ) ) {
1455                         return array();
1456                 }
1457
1458                 $dh = opendir( $extDir );
1459                 $exts = array();
1460                 while ( ( $file = readdir( $dh ) ) !== false ) {
1461                         if ( !is_dir( "$extDir/$file" ) ) {
1462                                 continue;
1463                         }
1464                         if ( file_exists( "$extDir/$file/$file.php" ) ) {
1465                                 $exts[] = $file;
1466                         }
1467                 }
1468                 closedir( $dh );
1469                 natcasesort( $exts );
1470
1471                 return $exts;
1472         }
1473
1474         /**
1475          * Installs the auto-detected extensions.
1476          *
1477          * @return Status
1478          */
1479         protected function includeExtensions() {
1480                 global $IP;
1481                 $exts = $this->getVar( '_Extensions' );
1482                 $IP = $this->getVar( 'IP' );
1483
1484                 /**
1485                  * We need to include DefaultSettings before including extensions to avoid
1486                  * warnings about unset variables. However, the only thing we really
1487                  * want here is $wgHooks['LoadExtensionSchemaUpdates']. This won't work
1488                  * if the extension has hidden hook registration in $wgExtensionFunctions,
1489                  * but we're not opening that can of worms
1490                  * @see https://bugzilla.wikimedia.org/show_bug.cgi?id=26857
1491                  */
1492                 global $wgAutoloadClasses;
1493                 $wgAutoloadClasses = array();
1494
1495                 require "$IP/includes/DefaultSettings.php";
1496
1497                 foreach ( $exts as $e ) {
1498                         require_once "$IP/extensions/$e/$e.php";
1499                 }
1500
1501                 $hooksWeWant = isset( $wgHooks['LoadExtensionSchemaUpdates'] ) ?
1502                         $wgHooks['LoadExtensionSchemaUpdates'] : array();
1503
1504                 // Unset everyone else's hooks. Lord knows what someone might be doing
1505                 // in ParserFirstCallInit (see bug 27171)
1506                 $GLOBALS['wgHooks'] = array( 'LoadExtensionSchemaUpdates' => $hooksWeWant );
1507
1508                 return Status::newGood();
1509         }
1510
1511         /**
1512          * Get an array of install steps. Should always be in the format of
1513          * array(
1514          *   'name'     => 'someuniquename',
1515          *   'callback' => array( $obj, 'method' ),
1516          * )
1517          * There must be a config-install-$name message defined per step, which will
1518          * be shown on install.
1519          *
1520          * @param DatabaseInstaller $installer DatabaseInstaller so we can make callbacks
1521          * @return array
1522          */
1523         protected function getInstallSteps( DatabaseInstaller $installer ) {
1524                 $coreInstallSteps = array(
1525                         array( 'name' => 'database', 'callback' => array( $installer, 'setupDatabase' ) ),
1526                         array( 'name' => 'tables', 'callback' => array( $installer, 'createTables' ) ),
1527                         array( 'name' => 'interwiki', 'callback' => array( $installer, 'populateInterwikiTable' ) ),
1528                         array( 'name' => 'stats', 'callback' => array( $this, 'populateSiteStats' ) ),
1529                         array( 'name' => 'keys', 'callback' => array( $this, 'generateKeys' ) ),
1530                         array( 'name' => 'sysop', 'callback' => array( $this, 'createSysop' ) ),
1531                         array( 'name' => 'mainpage', 'callback' => array( $this, 'createMainpage' ) ),
1532                 );
1533
1534                 // Build the array of install steps starting from the core install list,
1535                 // then adding any callbacks that wanted to attach after a given step
1536                 foreach ( $coreInstallSteps as $step ) {
1537                         $this->installSteps[] = $step;
1538                         if ( isset( $this->extraInstallSteps[$step['name']] ) ) {
1539                                 $this->installSteps = array_merge(
1540                                         $this->installSteps,
1541                                         $this->extraInstallSteps[$step['name']]
1542                                 );
1543                         }
1544                 }
1545
1546                 // Prepend any steps that want to be at the beginning
1547                 if ( isset( $this->extraInstallSteps['BEGINNING'] ) ) {
1548                         $this->installSteps = array_merge(
1549                                 $this->extraInstallSteps['BEGINNING'],
1550                                 $this->installSteps
1551                         );
1552                 }
1553
1554                 // Extensions should always go first, chance to tie into hooks and such
1555                 if ( count( $this->getVar( '_Extensions' ) ) ) {
1556                         array_unshift( $this->installSteps,
1557                                 array( 'name' => 'extensions', 'callback' => array( $this, 'includeExtensions' ) )
1558                         );
1559                         $this->installSteps[] = array(
1560                                 'name' => 'extension-tables',
1561                                 'callback' => array( $installer, 'createExtensionTables' )
1562                         );
1563                 }
1564
1565                 return $this->installSteps;
1566         }
1567
1568         /**
1569          * Actually perform the installation.
1570          *
1571          * @param callable $startCB A callback array for the beginning of each step
1572          * @param callable $endCB A callback array for the end of each step
1573          *
1574          * @return array Array of Status objects
1575          */
1576         public function performInstallation( $startCB, $endCB ) {
1577                 $installResults = array();
1578                 $installer = $this->getDBInstaller();
1579                 $installer->preInstall();
1580                 $steps = $this->getInstallSteps( $installer );
1581                 foreach ( $steps as $stepObj ) {
1582                         $name = $stepObj['name'];
1583                         call_user_func_array( $startCB, array( $name ) );
1584
1585                         // Perform the callback step
1586                         $status = call_user_func( $stepObj['callback'], $installer );
1587
1588                         // Output and save the results
1589                         call_user_func( $endCB, $name, $status );
1590                         $installResults[$name] = $status;
1591
1592                         // If we've hit some sort of fatal, we need to bail.
1593                         // Callback already had a chance to do output above.
1594                         if ( !$status->isOk() ) {
1595                                 break;
1596                         }
1597                 }
1598                 if ( $status->isOk() ) {
1599                         $this->setVar( '_InstallDone', true );
1600                 }
1601
1602                 return $installResults;
1603         }
1604
1605         /**
1606          * Generate $wgSecretKey. Will warn if we had to use an insecure random source.
1607          *
1608          * @return Status
1609          */
1610         public function generateKeys() {
1611                 $keys = array( 'wgSecretKey' => 64 );
1612                 if ( strval( $this->getVar( 'wgUpgradeKey' ) ) === '' ) {
1613                         $keys['wgUpgradeKey'] = 16;
1614                 }
1615
1616                 return $this->doGenerateKeys( $keys );
1617         }
1618
1619         /**
1620          * Generate a secret value for variables using our CryptRand generator.
1621          * Produce a warning if the random source was insecure.
1622          *
1623          * @param array $keys
1624          * @return Status
1625          */
1626         protected function doGenerateKeys( $keys ) {
1627                 $status = Status::newGood();
1628
1629                 $strong = true;
1630                 foreach ( $keys as $name => $length ) {
1631                         $secretKey = MWCryptRand::generateHex( $length, true );
1632                         if ( !MWCryptRand::wasStrong() ) {
1633                                 $strong = false;
1634                         }
1635
1636                         $this->setVar( $name, $secretKey );
1637                 }
1638
1639                 if ( !$strong ) {
1640                         $names = array_keys( $keys );
1641                         $names = preg_replace( '/^(.*)$/', '\$$1', $names );
1642                         global $wgLang;
1643                         $status->warning( 'config-insecure-keys', $wgLang->listToText( $names ), count( $names ) );
1644                 }
1645
1646                 return $status;
1647         }
1648
1649         /**
1650          * Create the first user account, grant it sysop and bureaucrat rights
1651          *
1652          * @return Status
1653          */
1654         protected function createSysop() {
1655                 $name = $this->getVar( '_AdminName' );
1656                 $user = User::newFromName( $name );
1657
1658                 if ( !$user ) {
1659                         // We should've validated this earlier anyway!
1660                         return Status::newFatal( 'config-admin-error-user', $name );
1661                 }
1662
1663                 if ( $user->idForName() == 0 ) {
1664                         $user->addToDatabase();
1665
1666                         try {
1667                                 $user->setPassword( $this->getVar( '_AdminPassword' ) );
1668                         } catch ( PasswordError $pwe ) {
1669                                 return Status::newFatal( 'config-admin-error-password', $name, $pwe->getMessage() );
1670                         }
1671
1672                         $user->addGroup( 'sysop' );
1673                         $user->addGroup( 'bureaucrat' );
1674                         if ( $this->getVar( '_AdminEmail' ) ) {
1675                                 $user->setEmail( $this->getVar( '_AdminEmail' ) );
1676                         }
1677                         $user->saveSettings();
1678
1679                         // Update user count
1680                         $ssUpdate = new SiteStatsUpdate( 0, 0, 0, 0, 1 );
1681                         $ssUpdate->doUpdate();
1682                 }
1683                 $status = Status::newGood();
1684
1685                 if ( $this->getVar( '_Subscribe' ) && $this->getVar( '_AdminEmail' ) ) {
1686                         $this->subscribeToMediaWikiAnnounce( $status );
1687                 }
1688
1689                 return $status;
1690         }
1691
1692         /**
1693          * @param Status $s
1694          */
1695         private function subscribeToMediaWikiAnnounce( Status $s ) {
1696                 $params = array(
1697                         'email' => $this->getVar( '_AdminEmail' ),
1698                         'language' => 'en',
1699                         'digest' => 0
1700                 );
1701
1702                 // Mailman doesn't support as many languages as we do, so check to make
1703                 // sure their selected language is available
1704                 $myLang = $this->getVar( '_UserLang' );
1705                 if ( in_array( $myLang, $this->mediaWikiAnnounceLanguages ) ) {
1706                         $myLang = $myLang == 'pt-br' ? 'pt_BR' : $myLang; // rewrite to Mailman's pt_BR
1707                         $params['language'] = $myLang;
1708                 }
1709
1710                 if ( MWHttpRequest::canMakeRequests() ) {
1711                         $res = MWHttpRequest::factory( $this->mediaWikiAnnounceUrl,
1712                                 array( 'method' => 'POST', 'postData' => $params ) )->execute();
1713                         if ( !$res->isOK() ) {
1714                                 $s->warning( 'config-install-subscribe-fail', $res->getMessage() );
1715                         }
1716                 } else {
1717                         $s->warning( 'config-install-subscribe-notpossible' );
1718                 }
1719         }
1720
1721         /**
1722          * Insert Main Page with default content.
1723          *
1724          * @param DatabaseInstaller $installer
1725          * @return Status
1726          */
1727         protected function createMainpage( DatabaseInstaller $installer ) {
1728                 $status = Status::newGood();
1729                 try {
1730                         $page = WikiPage::factory( Title::newMainPage() );
1731                         $content = new WikitextContent(
1732                                 wfMessage( 'mainpagetext' )->inContentLanguage()->text() . "\n\n" .
1733                                 wfMessage( 'mainpagedocfooter' )->inContentLanguage()->text()
1734                         );
1735
1736                         $page->doEditContent( $content,
1737                                 '',
1738                                 EDIT_NEW,
1739                                 false,
1740                                 User::newFromName( 'MediaWiki default' )
1741                         );
1742                 } catch ( MWException $e ) {
1743                         //using raw, because $wgShowExceptionDetails can not be set yet
1744                         $status->fatal( 'config-install-mainpage-failed', $e->getMessage() );
1745                 }
1746
1747                 return $status;
1748         }
1749
1750         /**
1751          * Override the necessary bits of the config to run an installation.
1752          */
1753         public static function overrideConfig() {
1754                 define( 'MW_NO_SESSION', 1 );
1755
1756                 // Don't access the database
1757                 $GLOBALS['wgUseDatabaseMessages'] = false;
1758                 // Don't cache langconv tables
1759                 $GLOBALS['wgLanguageConverterCacheType'] = CACHE_NONE;
1760                 // Debug-friendly
1761                 $GLOBALS['wgShowExceptionDetails'] = true;
1762                 // Don't break forms
1763                 $GLOBALS['wgExternalLinkTarget'] = '_blank';
1764
1765                 // Extended debugging
1766                 $GLOBALS['wgShowSQLErrors'] = true;
1767                 $GLOBALS['wgShowDBErrorBacktrace'] = true;
1768
1769                 // Allow multiple ob_flush() calls
1770                 $GLOBALS['wgDisableOutputCompression'] = true;
1771
1772                 // Use a sensible cookie prefix (not my_wiki)
1773                 $GLOBALS['wgCookiePrefix'] = 'mw_installer';
1774
1775                 // Some of the environment checks make shell requests, remove limits
1776                 $GLOBALS['wgMaxShellMemory'] = 0;
1777
1778                 // Don't bother embedding images into generated CSS, which is not cached
1779                 $GLOBALS['wgResourceLoaderLESSFunctions']['embeddable'] = function ( $frame, $less ) {
1780                         return $less->toBool( false );
1781                 };
1782         }
1783
1784         /**
1785          * Add an installation step following the given step.
1786          *
1787          * @param callable $callback A valid installation callback array, in this form:
1788          *    array( 'name' => 'some-unique-name', 'callback' => array( $obj, 'function' ) );
1789          * @param string $findStep The step to find. Omit to put the step at the beginning
1790          */
1791         public function addInstallStep( $callback, $findStep = 'BEGINNING' ) {
1792                 $this->extraInstallSteps[$findStep][] = $callback;
1793         }
1794
1795         /**
1796          * Disable the time limit for execution.
1797          * Some long-running pages (Install, Upgrade) will want to do this
1798          */
1799         protected function disableTimeLimit() {
1800                 wfSuppressWarnings();
1801                 set_time_limit( 0 );
1802                 wfRestoreWarnings();
1803         }
1804 }