includes/installer/Installer.php

   1 <?php
   2
   3 /**
   4  * Base installer class
   5  * Handles everything that is independent of user interface
   6  */
   7 abstract class Installer {
   8         var $settings, $output;
   9
  10         /**
  11          * MediaWiki configuration globals that will eventually be passed through
  12          * to LocalSettings.php. The names only are given here, the defaults
  13          * typically come from DefaultSettings.php.
  14          * @protected
  15          */
  16         var $defaultVarNames = array(
  17                 'wgSitename',
  18                 'wgPasswordSender',
  19                 'wgLanguageCode',
  20                 'wgRightsIcon',
  21                 'wgRightsText',
  22                 'wgRightsUrl',
  23                 'wgMainCacheType',
  24                 'wgEnableEmail',
  25                 'wgEnableUserEmail',
  26                 'wgEnotifUserTalk',
  27                 'wgEnotifWatchlist',
  28                 'wgEmailAuthentication',
  29                 'wgDBtype',
  30                 'wgDiff3',
  31                 'wgImageMagickConvertCommand',
  32                 'IP',
  33                 'wgScriptPath',
  34                 'wgScriptExtension',
  35                 'wgMetaNamespace',
  36 //              'wgDeletedDirectory',
  37                 'wgEnableUploads',
  38                 'wgLogo',
  39                 'wgShellLocale',
  40                 'wgSecretKey',
  41         );
  42
  43         /**
  44          * Variables that are stored alongside globals, and are used for any
  45          * configuration of the installation process aside from the MediaWiki
  46          * configuration. Map of names to defaults.
  47          * @protected
  48          */
  49         var $internalDefaults = array(
  50                 '_UserLang' => 'en',
  51                 '_Environment' => false,
  52                 '_CompiledDBs' => array(),
  53                 '_SafeMode' => false,
  54                 '_RaiseMemory' => false,
  55                 '_UpgradeDone' => false,
  56                 '_Caches' => array(),
  57                 '_InstallUser' => 'root',
  58                 '_InstallPassword' => '',
  59                 '_SameAccount' => true,
  60                 '_CreateDBAccount' => false,
  61                 '_NamespaceType' => 'site-name',
  62                 '_AdminName' => null, // will be set later, when the user selects language
  63                 '_AdminPassword' => '',
  64                 '_AdminPassword2' => '',
  65                 '_AdminEmail' => '',
  66                 '_Subscribe' => false,
  67                 '_SkipOptional' => 'continue',
  68                 '_RightsProfile' => 'wiki',
  69                 '_LicenseCode' => 'none',
  70                 '_CCDone' => false,
  71                 '_Extensions' => array(),
  72                 '_MemCachedServers' => '',
  73         );
  74
  75         /**
  76          * Known database types. These correspond to the class names <type>Installer,
  77          * and are also MediaWiki database types valid for $wgDBtype.
  78          *
  79          * To add a new type, create a <type>Installer class and a Database<type>
  80          * class, and add a config-type-<type> message to MessagesEn.php.
  81          * @private
  82          */
  83         var $dbTypes = array(
  84                 'mysql',
  85                 'postgres',
  86                 'sqlite',
  87                 'oracle'
  88         );
  89
  90         /**
  91          * Minimum memory size in MB
  92          */
  93         private $minMemorySize = 50;
  94
  95         /**
  96          * Cached DB installer instances, access using getDBInstaller()
  97          * @private
  98          */
  99         var $dbInstallers = array();
 100
 101         /**
 102          * A list of environment check methods called by doEnvironmentChecks().
 103          * These may output warnings using showMessage(), and/or abort the
 104          * installation process by returning false.
 105          * @protected
 106          */
 107         var $envChecks = array(
 108                 'envLatestVersion',
 109                 'envCheckDB',
 110                 'envCheckRegisterGlobals',
 111                 'envCheckMagicQuotes',
 112                 'envCheckMagicSybase',
 113                 'envCheckMbstring',
 114                 'envCheckZE1',
 115                 'envCheckSafeMode',
 116                 'envCheckXML',
 117                 'envCheckPCRE',
 118                 'envCheckMemory',
 119                 'envCheckCache',
 120                 'envCheckDiff3',
 121                 'envCheckGraphics',
 122                 'envCheckPath',
 123                 'envCheckWriteableDir',
 124                 'envCheckExtension',
 125                 'envCheckShellLocale',
 126                 'envCheckUploadsDirectory',
 127         );
 128
 129         var $installSteps = array(
 130                 'database',
 131                 'user',
 132                 'tables',
 133                 'interwiki',
 134                 'secretkey',
 135                 'sysop',
 136                 'localsettings',
 137         );
 138
 139         /**
 140          * Known object cache types and the functions used to test for their existence
 141          * @protected
 142          */
 143         var $objectCaches = array(
 144                 'xcache' => 'xcache_get',
 145                 'apc' => 'apc_fetch',
 146                 'eaccel' => 'eaccelerator_get',
 147                 'wincache' => 'wincache_ucache_get'
 148         );
 149
 150         /**
 151          * User rights profiles
 152          */
 153         var $rightsProfiles = array(
 154                 'wiki' => array(),
 155                 'no-anon' => array(
 156                         '*' => array( 'edit' => false )
 157                 ),
 158                 'fishbowl' => array(
 159                         '*' => array(
 160                                 'createaccount' => false,
 161                                 'edit' => false,
 162                         ),
 163                 ),
 164                 'private' => array(
 165                         '*' => array(
 166                                 'createaccount' => false,
 167                                 'edit' => false,
 168                                 'read' => false,
 169                         ),
 170                 ),
 171         );
 172
 173         /**
 174          * License types
 175          */
 176         var $licenses = array(
 177                 'none' => array(
 178                         'url' => '',
 179                         'icon' => '',
 180                         'text' => ''
 181                 ),
 182                 'cc-by-sa' => array(
 183                         'url' => 'http://creativecommons.org/licenses/by-sa/3.0/',
 184                         'icon' => '{$wgStylePath}/common/images/cc-by-sa.png',
 185                 ),
 186                 'cc-by-nc-sa' => array(
 187                         'url' => 'http://creativecommons.org/licenses/by-nc-sa/3.0/',
 188                         'icon' => '{$wgStylePath}/common/images/cc-by-nc-sa.png',
 189                 ),
 190                 'pd' => array(
 191                         'url' => 'http://creativecommons.org/licenses/publicdomain/',
 192                         'icon' => '{$wgStylePath}/common/images/public-domain.png',
 193                 ),
 194                 'gfdl-old' => array(
 195                         'url' => 'http://www.gnu.org/licenses/old-licenses/fdl-1.2.html',
 196                         'icon' => '{$wgStylePath}/common/images/gnu-fdl.png',
 197                 ),
 198                 'gfdl-current' => array(
 199                         'url' => 'http://www.gnu.org/copyleft/fdl.html',
 200                         'icon' => '{$wgStylePath}/common/images/gnu-fdl.png',
 201                 ),
 202                 'cc-choose' => array(
 203                         // details will be filled in by the selector
 204                         'url' => '',
 205                         'icon' => '',
 206                         'text' => '',
 207                 ),
 208         );
 209         /**
 210          * Cached Title and ParserOptions used by parse()
 211          * @private
 212          */
 213         var $parserTitle, $parserOptions;
 214
 215         /**
 216          * Constructor, always call this from child classes
 217          */
 218         function __construct() {
 219                 // Disable the i18n cache and LoadBalancer
 220                 Language::getLocalisationCache()->disableBackend();
 221                 LBFactory::disableBackend();
 222
 223                 // Load the installer's i18n file
 224                 global $wgExtensionMessagesFiles;
 225                 $wgExtensionMessagesFiles['MediawikiInstaller'] =
 226                         './includes/installer/Installer.i18n.php';
 227
 228                 global $wgUser;
 229                 $wgUser = User::newFromId( 0 );
 230                 // Having a user with id = 0 safeguards us from DB access via User::loadOptions()
 231
 232                 // Set our custom <doclink> hook
 233                 global $wgHooks;
 234                 $wgHooks['ParserFirstCallInit'][] = array( $this, 'registerDocLink' );
 235
 236                 $this->settings = $this->internalDefaults;
 237                 foreach ( $this->defaultVarNames as $var ) {
 238                         $this->settings[$var] = $GLOBALS[$var];
 239                 }
 240                 foreach ( $this->dbTypes as $type ) {
 241                         $installer = $this->getDBInstaller( $type );
 242                         if ( !$installer->isCompiled() ) {
 243                                 continue;
 244                         }
 245                         $defaults = $installer->getGlobalDefaults();
 246                         foreach ( $installer->getGlobalNames() as $var ) {
 247                                 if ( isset( $defaults[$var] ) ) {
 248                                         $this->settings[$var] = $defaults[$var];
 249                                 } else {
 250                                         $this->settings[$var] = $GLOBALS[$var];
 251                                 }
 252                         }
 253                 }
 254
 255                 $this->parserTitle = Title::newFromText( 'Installer' );
 256                 $this->parserOptions = new ParserOptions;
 257                 $this->parserOptions->setEditSection( false );
 258         }
 259
 260         /**
 261          * UI interface for displaying a short message
 262          * The parameters are like parameters to wfMsg().
 263          * The messages will be in wikitext format, which will be converted to an
 264          * output format such as HTML or text before being sent to the user.
 265          */
 266         abstract function showMessage( $msg /*, ... */ );
 267
 268         abstract function showStatusMessage( $status );
 269
 270         /**
 271          * Get a list of known DB types
 272          */
 273         function getDBTypes() {
 274                 return $this->dbTypes;
 275         }
 276
 277         /**
 278          * Get an instance of InstallerDBType for the specified DB type
 279          * @param $type Mixed: DB installer for which is needed, false to use default
 280          */
 281         function getDBInstaller( $type = false ) {
 282                 if ( !$type ) {
 283                         $type = $this->getVar( 'wgDBtype' );
 284                 }
 285                 if ( !isset( $this->dbInstallers[$type] ) ) {
 286                         $class = ucfirst( $type ). 'Installer';
 287                         $this->dbInstallers[$type] = new $class( $this );
 288                 }
 289                 return $this->dbInstallers[$type];
 290         }
 291
 292         /**
 293          * Do initial checks of the PHP environment. Set variables according to
 294          * the observed environment.
 295          *
 296          * It's possible that this may be called under the CLI SAPI, not the SAPI
 297          * that the wiki will primarily run under. In that case, the subclass should
 298          * initialise variables such as wgScriptPath, before calling this function.
 299          *
 300          * Under the web subclass, it can already be assumed that PHP 5+ is in use
 301          * and that sessions are working.
 302          */
 303         function doEnvironmentChecks() {
 304                 $this->showMessage( 'config-env-php', phpversion() );
 305
 306                 $good = true;
 307                 foreach ( $this->envChecks as $check ) {
 308                         $status = $this->$check();
 309                         if ( $status === false ) {
 310                                 $good = false;
 311                         }
 312                 }
 313                 $this->setVar( '_Environment', $good );
 314                 if ( $good ) {
 315                         $this->showMessage( 'config-env-good' );
 316                 } else {
 317                         $this->showMessage( 'config-env-bad' );
 318                 }
 319                 return $good;
 320         }
 321
 322         /**
 323          * Get an MW configuration variable, or internal installer configuration variable.
 324          * The defaults come from $GLOBALS (ultimately DefaultSettings.php).
 325          * Installer variables are typically prefixed by an underscore.
 326          */
 327         function getVar( $name, $default = null ) {
 328                 if ( !isset( $this->settings[$name] ) ) {
 329                         return $default;
 330                 } else {
 331                         return $this->settings[$name];
 332                 }
 333         }
 334
 335         /**
 336          * Set a MW configuration variable, or internal installer configuration variable.
 337          */
 338         function setVar( $name, $value ) {
 339                 $this->settings[$name] = $value;
 340         }
 341
 342         /**
 343          * Exports all wg* variables stored by the installer into global scope
 344          */
 345         function exportVars() {
 346                 foreach ( $this->settings as $name => $value ) {
 347                         if ( substr( $name, 0, 2 ) == 'wg' ) {
 348                                 $GLOBALS[$name] = $value;
 349                         }
 350                 }
 351         }
 352
 353         /**
 354          * Get a fake password for sending back to the user in HTML.
 355          * This is a security mechanism to avoid compromise of the password in the
 356          * event of session ID compromise.
 357          */
 358         function getFakePassword( $realPassword ) {
 359                 return str_repeat( '*', strlen( $realPassword ) );
 360         }
 361
 362         /**
 363          * Set a variable which stores a password, except if the new value is a
 364          * fake password in which case leave it as it is.
 365          */
 366         function setPassword( $name, $value ) {
 367                 if ( !preg_match( '/^\*+$/', $value ) ) {
 368                         $this->setVar( $name, $value );
 369                 }
 370         }
 371
 372         /** Check if we're installing the latest version */
 373         function envLatestVersion() {
 374                 global $wgVersion;
 375                 $latestInfoUrl = 'http://www.mediawiki.org/w/api.php?action=mwreleases&format=json';
 376                 $latestInfo = Http::get( $latestInfoUrl );
 377                 if( !$latestInfo ) {
 378                         $this->showMessage( 'config-env-latest-can-not-check', $latestInfoUrl );
 379                         return;
 380                 }
 381                 $latestInfo = FormatJson::decode($latestInfo);
 382                 if ($latestInfo === false || !isset( $latestInfo->mwreleases ) ) {
 383                         # For when the request is successful but there's e.g. some silly man in
 384                         # the middle firewall blocking us, e.g. one of those annoying airport ones
 385                         $this->showMessage( 'config-env-latest-data-invalid', $latestInfoUrl );
 386                         return;
 387                 }
 388                 foreach( $latestInfo->mwreleases as $rel ) {
 389                         if( isset( $rel->current ) )
 390                                 $currentVersion = $rel->version;
 391                 }
 392                 if( version_compare( $wgVersion, $currentVersion, '<' ) ) {
 393                         $this->showMessage( 'config-env-latest-old' );
 394                         $this->showHelpBox( 'config-env-latest-help', $wgVersion, $currentVersion );
 395                 } elseif( version_compare( $wgVersion, $currentVersion, '>' ) ) {
 396                         $this->showMessage( 'config-env-latest-new' );
 397                 }
 398                 $this->showMessage( 'config-env-latest-ok' );
 399         }
 400
 401         /** Environment check for DB types */
 402         function envCheckDB() {
 403                 $compiledDBs = array();
 404                 $goodNames = array();
 405                 $allNames = array();
 406                 foreach ( $this->dbTypes as $name ) {
 407                         $db = $this->getDBInstaller( $name );
 408                         $readableName = wfMsg( 'config-type-' . $name );
 409                         if ( $db->isCompiled() ) {
 410                                 $compiledDBs[] = $name;
 411                                 $goodNames[] = $readableName;
 412                         }
 413                         $allNames[] = $readableName;
 414                 }
 415                 $this->setVar( '_CompiledDBs', $compiledDBs );
 416
 417                 global $wgLang;
 418                 if ( !$compiledDBs ) {
 419                         $this->showMessage( 'config-no-db' );
 420                         $this->showHelpBox( 'config-no-db-help', $wgLang->commaList( $allNames ) );
 421                         return false;
 422                 }
 423                 $this->showMessage( 'config-have-db', $wgLang->commaList( $goodNames ) );
 424         }
 425
 426         /** Environment check for register_globals */
 427         function envCheckRegisterGlobals() {
 428                 if( wfIniGetBool( "magic_quotes_runtime" ) ) {
 429                         $this->showMessage( 'config-register-globals' );
 430                 }
 431         }
 432
 433         /** Environment check for magic_quotes_runtime */
 434         function envCheckMagicQuotes() {
 435                 if( wfIniGetBool( "magic_quotes_runtime" ) ) {
 436                         $this->showMessage( 'config-magic-quotes-runtime' );
 437                         return false;
 438                 }
 439         }
 440
 441         /** Environment check for magic_quotes_sybase */
 442         function envCheckMagicSybase() {
 443                 if ( wfIniGetBool( 'magic_quotes_sybase' ) ) {
 444                         $this->showMessage( 'config-magic-quotes-sybase' );
 445                         return false;
 446                 }
 447         }
 448
 449         /* Environment check for mbstring.func_overload */
 450         function envCheckMbstring() {
 451                 if ( wfIniGetBool( 'mbstring.func_overload' ) ) {
 452                         $this->showMessage( 'config-mbstring' );
 453                         return false;
 454                 }
 455         }
 456
 457         /** Environment check for zend.ze1_compatibility_mode */
 458         function envCheckZE1() {
 459                 if ( wfIniGetBool( 'zend.ze1_compatibility_mode' ) ) {
 460                         $this->showMessage( 'config-ze1' );
 461                         return false;
 462                 }
 463         }
 464
 465         /** Environment check for safe_mode */
 466         function envCheckSafeMode() {
 467                 if ( wfIniGetBool( 'safe_mode' ) ) {
 468                         $this->setVar( '_SafeMode', true );
 469                         $this->showMessage( 'config-safe-mode' );
 470                 }
 471         }
 472
 473         /** Environment check for the XML module */
 474         function envCheckXML() {
 475                 if ( !function_exists( "utf8_encode" ) ) {
 476                         $this->showMessage( 'config-xml-bad' );
 477                         return false;
 478                 }
 479                 $this->showMessage( 'config-xml-good' );
 480         }
 481
 482         /** Environment check for the PCRE module */
 483         function envCheckPCRE() {
 484                 if ( !function_exists( 'preg_match' ) ) {
 485                         $this->showMessage( 'config-pcre' );
 486                         return false;
 487                 }
 488         }
 489
 490         /** Environment check for available memory */
 491         function envCheckMemory() {
 492                 $limit = ini_get( 'memory_limit' );
 493                 if ( !$limit || $limit == -1 ) {
 494                         $this->showMessage( 'config-memory-none' );
 495                         return true;
 496                 }
 497                 $n = intval( $limit );
 498                 if( preg_match( '/^([0-9]+)[Mm]$/', trim( $limit ), $m ) ) {
 499                         $n = intval( $m[1] * (1024*1024) );
 500                 }
 501                 if( $n < $this->minMemorySize*1024*1024 ) {
 502                         $newLimit = "{$this->minMemorySize}M";
 503                         if( false === ini_set( "memory_limit", $newLimit ) ) {
 504                                 $this->showMessage( 'config-memory-bad', $limit );
 505                         } else {
 506                                 $this->showMessage( 'config-memory-raised', $limit, $newLimit );
 507                                 $this->setVar( '_RaiseMemory', true );
 508                         }
 509                 } else {
 510                         $this->showMessage( 'config-memory-ok', $limit );
 511                 }
 512         }
 513
 514         /** Environment check for compiled object cache types */
 515         function envCheckCache() {
 516                 $caches = array();
 517                 foreach ( $this->objectCaches as $name => $function ) {
 518                         if ( function_exists( $function ) ) {
 519                                 $caches[$name] = true;
 520                                 $this->showMessage( 'config-' . $name );
 521                         }
 522                 }
 523                 if ( !$caches ) {
 524                         $this->showMessage( 'config-no-cache' );
 525                 }
 526                 $this->setVar( '_Caches', $caches );
 527         }
 528
 529         /** Search for GNU diff3 */
 530         function envCheckDiff3() {
 531                 $paths = array_merge(
 532                         array(
 533                                 "/usr/bin",
 534                                 "/usr/local/bin",
 535                                 "/opt/csw/bin",
 536                                 "/usr/gnu/bin",
 537                                 "/usr/sfw/bin" ),
 538                         explode( PATH_SEPARATOR, getenv( "PATH" ) ) );
 539                 $names = array( "gdiff3", "diff3", "diff3.exe" );
 540
 541                 $versionInfo = array( '$1 --version 2>&1', 'diff3 (GNU diffutils)' );
 542                 $haveDiff3 = false;
 543                 foreach ( $paths as $path ) {
 544                         $exe = $this->locateExecutable( $path, $names, $versionInfo );
 545                         if ($exe !== false) {
 546                                 $this->setVar( 'wgDiff3', $exe );
 547                                 $haveDiff3 = true;
 548                                 break;
 549                         }
 550                 }
 551                 if ( $haveDiff3 ) {
 552                         $this->showMessage( 'config-diff3-good', $exe );
 553                 } else {
 554                         $this->setVar( 'wgDiff3', false );
 555                         $this->showMessage( 'config-diff3-bad' );
 556                 }
 557         }
 558
 559         /**
 560          * Search a path for any of the given executable names. Returns the
 561          * executable name if found. Also checks the version string returned
 562          * by each executable
 563          *
 564          * @param $path String: path to search
 565          * @param $names Array of executable names
 566          * @param $versionInfo Boolean false or array with two members:
 567          *       0 => Command to run for version check, with $1 for the path
 568          *       1 => String to compare the output with
 569          *
 570          * If $versionInfo is not false, only executables with a version
 571          * matching $versionInfo[1] will be returned.
 572          */
 573         function locateExecutable( $path, $names, $versionInfo = false ) {
 574                 if (!is_array($names))
 575                         $names = array($names);
 576
 577                 foreach ($names as $name) {
 578                         $command = "$path/$name";
 579                         if ( @file_exists( $command ) ) {
 580                                 if ( !$versionInfo )
 581                                         return $command;
 582
 583                                 $file = str_replace( '$1', $command, $versionInfo[0] );
 584                                 # Should maybe be wfShellExec( $file), but runs into a ulimit, see
 585                                 # http://www.mediawiki.org/w/index.php?title=New-installer_issues&diff=prev&oldid=335456
 586                                 if ( strstr( `$file`, $versionInfo[1]) !== false )
 587                                         return $command;
 588                         }
 589                 }
 590                 return false;
 591         }
 592
 593         /** Environment check for ImageMagick and GD */
 594         function envCheckGraphics() {
 595                 $imcheck = array( "/usr/bin", "/opt/csw/bin", "/usr/local/bin", "/sw/bin", "/opt/local/bin" );
 596                 foreach( $imcheck as $dir ) {
 597                         $im = "$dir/convert";
 598                         if( @file_exists( $im ) ) {
 599                                 $this->showMessage( 'config-imagemagick', $im );
 600                                 $this->setVar( 'wgImageMagickConvertCommand', $im );
 601                                 return true;
 602                         }
 603                 }
 604                 if ( function_exists( 'imagejpeg' ) ) {
 605                         $this->showMessage( 'config-gd' );
 606                         return true;
 607                 }
 608                 $this->showMessage( 'no-scaling' );
 609         }
 610
 611         /** Environment check for setting $IP and $wgScriptPath */
 612         function envCheckPath() {
 613                 $IP = dirname( dirname( dirname( __FILE__ ) ) );
 614                 $this->setVar( 'IP', $IP );
 615                 $this->showMessage( 'config-dir', $IP );
 616
 617                 // PHP_SELF isn't available sometimes, such as when PHP is CGI but
 618                 // cgi.fix_pathinfo is disabled. In that case, fall back to SCRIPT_NAME
 619                 // to get the path to the current script... hopefully it's reliable. SIGH
 620                 if ( !empty( $_SERVER['PHP_SELF'] ) ) {
 621                         $path = $_SERVER['PHP_SELF'];
 622                 } elseif ( !empty( $_SERVER['SCRIPT_NAME'] ) ) {
 623                         $path = $_SERVER['SCRIPT_NAME'];
 624                 } elseif ( $this->getVar( 'wgScriptPath' ) ) {
 625                         // Some kind soul has set it for us already (e.g. debconf)
 626                         return true;
 627                 } else {
 628                         $this->showMessage( 'config-no-uri' );
 629                         return false;
 630                 }
 631                 $uri = preg_replace( '{^(.*)/config.*$}', '$1', $path );
 632                 $this->setVar( 'wgScriptPath', $uri );
 633                 $this->showMessage( 'config-uri', $uri );
 634         }
 635
 636         /** Environment check for writable config/ directory */
 637         function envCheckWriteableDir() {
 638                 $ipDir = $this->getVar( 'IP' );
 639                 $configDir = $ipDir . '/config';
 640                 if( !is_writeable( $configDir ) ) {
 641                         $webserverGroup = self::maybeGetWebserverPrimaryGroup();
 642                         if ( $webserverGroup !== null ) {
 643                                 $this->showMessage( 'config-dir-not-writable-group', $ipDir, $webserverGroup );
 644                         } else {
 645                                 $this->showMessage( 'config-dir-not-writable-nogroup', $ipDir, $webserverGroup );
 646                         }
 647                         return false;
 648                 }
 649         }
 650
 651         /** Environment check for setting the preferred PHP file extension */
 652         function envCheckExtension() {
 653                 // FIXME: detect this properly
 654                 if ( defined( 'MW_INSTALL_PHP5_EXT' ) ) {
 655                         $ext = 'php5';
 656                 } else {
 657                         $ext = 'php';
 658                 }
 659                 $this->setVar( 'wgScriptExtension', ".$ext" );
 660                 $this->showMessage( 'config-file-extension', $ext );
 661         }
 662
 663         function envCheckShellLocale() {
 664                 # Give up now if we're in safe mode or open_basedir
 665                 # It's theoretically possible but tricky to work with
 666                 if ( wfIniGetBool( "safe_mode" ) || ini_get( 'open_basedir' ) || !function_exists( 'exec' ) ) {
 667                         return true;
 668                 }
 669
 670                 $os = php_uname( 's' );
 671                 $supported = array( 'Linux', 'SunOS', 'HP-UX' ); # Tested these
 672                 if ( !in_array( $os, $supported ) ) {
 673                         return true;
 674                 }
 675
 676                 # Get a list of available locales
 677                 $lines = $ret = false;
 678                 exec( '/usr/bin/locale -a', $lines, $ret );
 679                 if ( $ret ) {
 680                         return true;
 681                 }
 682
 683                 $lines = wfArrayMap( 'trim', $lines );
 684                 $candidatesByLocale = array();
 685                 $candidatesByLang = array();
 686                 foreach ( $lines as $line ) {
 687                         if ( $line === '' ) {
 688                                 continue;
 689                         }
 690                         if ( !preg_match( '/^([a-zA-Z]+)(_[a-zA-Z]+|)\.(utf8|UTF-8)(@[a-zA-Z_]*|)$/i', $line, $m ) ) {
 691                                 continue;
 692                         }
 693                         list( $all, $lang, $territory, $charset, $modifier ) = $m;
 694                         $candidatesByLocale[$m[0]] = $m;
 695                         $candidatesByLang[$lang][] = $m;
 696                 }
 697
 698                 # Try the current value of LANG
 699                 if ( isset( $candidatesByLocale[ getenv( 'LANG' ) ] ) ) {
 700                         $this->setVar( 'wgShellLocale', getenv( 'LANG' ) );
 701                         $this->showMessage( 'config-shell-locale', getenv( 'LANG' ) );
 702                         return true;
 703                 }
 704
 705                 # Try the most common ones
 706                 $commonLocales = array( 'en_US.UTF-8', 'en_US.utf8', 'de_DE.UTF-8', 'de_DE.utf8' );
 707                 foreach ( $commonLocales as $commonLocale ) {
 708                         if ( isset( $candidatesByLocale[$commonLocale] ) ) {
 709                                 $this->setVar( 'wgShellLocale', $commonLocale );
 710                                 $this->showMessage( 'config-shell-locale', $commonLocale );
 711                                 return true;
 712                         }
 713                 }
 714
 715                 # Is there an available locale in the Wiki's language?
 716                 $wikiLang = $this->getVar( 'wgLanguageCode' );
 717                 if ( isset( $candidatesByLang[$wikiLang] ) ) {
 718                         $m = reset( $candidatesByLang[$wikiLang] );
 719                         $this->setVar( 'wgShellLocale', $m[0] );
 720                         $this->showMessage( 'config-shell-locale', $m[0] );
 721                         return true;
 722                 }
 723
 724                 # Are there any at all?
 725                 if ( count( $candidatesByLocale ) ) {
 726                         $m = reset( $candidatesByLocale );
 727                         $this->setVar( 'wgShellLocale', $m[0] );
 728                         $this->showMessage( 'config-shell-locale', $m[0] );
 729                         return true;
 730                 }
 731
 732                 # Give up
 733                 return true;
 734         }
 735
 736         function envCheckUploadsDirectory() {
 737                 global $IP, $wgServer;
 738                 $dir = $IP . '/images/';
 739                 $url = $wgServer . $this->getVar( 'wgScriptPath' ) . '/images/';
 740                 $safe = !$this->dirIsExecutable( $dir, $url );
 741                 if ( $safe ) {
 742                         $this->showMessage( 'config-uploads-safe' );
 743                 } else {
 744                         $this->showMessage( 'config-uploads-not-safe', $dir );
 745                 }
 746         }
 747
 748         /**
 749          * Checks if scripts located in the given directory can be executed via the given URL
 750          */
 751         function dirIsExecutable( $dir, $url ) {
 752                 $scriptTypes = array(
 753                         'php' => array(
 754                                 "<?php echo 'ex' . 'ec';",
 755                                 "#!/var/env php5\n<?php echo 'ex' . 'ec';",
 756                         ),
 757                 );
 758                 // it would be good to check other popular languages here, but it'll be slow
 759
 760                 wfSuppressWarnings();
 761                 foreach ( $scriptTypes as $ext => $contents ) {
 762                         foreach ( $contents as $source ) {
 763                                 $file = 'exectest.' . $ext;
 764                                 if ( !file_put_contents( $dir . $file, $source ) ) {
 765                                         break;
 766                                 }
 767                                 $text = Http::get( $url . $file );
 768                                 unlink( $dir . $file );
 769                                 if ( $text == 'exec' ) {
 770                                         wfRestoreWarnings();
 771                                         return $ext;
 772                                 }
 773                         }
 774                 }
 775                 wfRestoreWarnings();
 776                 return false;
 777         }
 778
 779         /**
 780          * Convert wikitext $text to HTML.
 781          *
 782          * This is potentially error prone since many parser features require a complete
 783          * installed MW database. The solution is to just not use those features when you
 784          * write your messages. This appears to work well enough. Basic formatting and
 785          * external links work just fine.
 786          *
 787          * But in case a translator decides to throw in a #ifexist or internal link or
 788          * whatever, this function is guarded to catch attempted DB access and to present
 789          * some fallback text.
 790          *
 791          * @param $text String
 792          * @param $lineStart Boolean
 793          * @return String
 794          */
 795         function parse( $text, $lineStart = false ) {
 796                 global $wgParser;
 797                 try {
 798                         $out = $wgParser->parse( $text, $this->parserTitle, $this->parserOptions, $lineStart );
 799                         $html = $out->getText();
 800                 } catch ( DBAccessError $e ) {
 801                         $html = '<!--DB access attempted during parse-->  ' . htmlspecialchars( $text );
 802                         if ( !empty( $this->debug ) ) {
 803                                 $html .= "<!--\n" . $e->getTraceAsString() . "\n-->";
 804                         }
 805                 }
 806                 return $html;
 807         }
 808
 809         /**
 810          * Register tag hook below
 811          */
 812         function registerDocLink( &$parser ) {
 813                 $parser->setHook( 'doclink', array( $this, 'docLink' ) );
 814                 return true;
 815         }
 816
 817         /**
 818          * Extension tag hook for a documentation link
 819          */
 820         function docLink( $linkText, $attribs, $parser ) {
 821                 $url = $this->getDocUrl( $attribs['href'] );
 822                 return '<a href="' . htmlspecialchars( $url ) . '">' .
 823                         htmlspecialchars( $linkText ) .
 824                         '</a>';
 825         }
 826
 827         /**
 828          * Overridden by WebInstaller to provide lastPage parameters
 829          */
 830         protected function getDocUrl( $page ) {
 831                 return "{$_SERVER['PHP_SELF']}?page=" . urlencode( $attribs['href'] );
 832         }
 833
 834         public function findExtensions() {
 835                 if( $this->getVar( 'IP' ) === null ) {
 836                         return false;
 837                 }
 838                 $exts = array();
 839                 $dir = $this->getVar( 'IP' ) . '/extensions';
 840                 $dh = opendir( $dir );
 841                 while ( ( $file = readdir( $dh ) ) !== false ) {
 842                         if( file_exists( "$dir/$file/$file.php" ) ) {
 843                                 $exts[] = $file;
 844                         }
 845                 }
 846                 $this->setVar( '_Extensions', $exts );
 847                 return $exts;
 848         }
 849
 850         public function getInstallSteps() {
 851                 if( $this->getVar( '_UpgradeDone' ) ) {
 852                         $this->installSteps = array( 'localsettings' );
 853                 }
 854                 if( count( $this->getVar( '_Extensions' ) ) ) {
 855                         array_unshift( $this->installSteps, 'extensions' );
 856                 }
 857                 return $this->installSteps;
 858         }
 859
 860         public function installExtensions() {
 861                 global $wgHooks, $wgAutoloadClasses;
 862                 $exts = $this->getVar( '_Extensions' );
 863                 $path = $this->getVar( 'IP' ) . '/extensions';
 864                 foreach( $exts as $e ) {
 865                         require( "$path/$e/$e.php" );
 866                 }
 867                 return Status::newGood();
 868         }
 869
 870         public function installDatabase() {
 871                 $installer = $this->getDBInstaller( $this->getVar( 'wgDBtype' ) );
 872                 $status = $installer->setupDatabase();
 873                 return $status;
 874         }
 875
 876         public function installUser() {
 877                 $installer = $this->getDBInstaller( $this->getVar( 'wgDBtype' ) );
 878                 $status = $installer->setupUser();
 879                 return $status;
 880         }
 881
 882         public function installTables() {
 883                 $installer = $this->getDBInstaller();
 884                 $status = $installer->createTables();
 885                 if( $status->isOK() ) {
 886                         LBFactory::enableBackend();
 887                 }
 888                 return $status;
 889         }
 890
 891         public function installInterwiki() {
 892                 $installer = $this->getDBInstaller();
 893                 return $installer->populateInterwikiTable();
 894         }
 895
 896         public function installSecretKey() {
 897                 if ( wfIsWindows() ) {
 898                         $file = null;
 899                 } else {
 900                         wfSuppressWarnings();
 901                         $file = fopen( "/dev/urandom", "r" );
 902                         wfRestoreWarnings();
 903                 }
 904
 905                 $status = Status::newGood();
 906
 907                 if ( $file ) {
 908                         $secretKey = bin2hex( fread( $file, 32 ) );
 909                         fclose( $file );
 910                 } else {
 911                         $secretKey = "";
 912                         for ( $i=0; $i<8; $i++ ) {
 913                                 $secretKey .= dechex(mt_rand(0, 0x7fffffff));
 914                         }
 915                         $status->warning( 'config-insecure-secretkey' );
 916                 }
 917                 $this->setVar( 'wgSecretKey', $secretKey );
 918
 919                 return $status;
 920         }
 921
 922         public function installSysop() {
 923                 $name = $this->getVar( '_AdminName' );
 924                 $user = User::newFromName( $name );
 925                 if ( !$user ) {
 926                         // we should've validated this earlier anyway!
 927                         return Status::newFatal( 'config-admin-error-user', $name );
 928                 }
 929                 if ( $user->idForName() == 0 ) {
 930                         $user->addToDatabase();
 931                         try {
 932                                 $user->setPassword( $this->getVar( '_AdminPassword' ) );
 933                         } catch( PasswordError $pwe ) {
 934                                 return Status::newFatal( 'config-admin-error-password', $name, $pwe->getMessage() );
 935                         }
 936                         $user->addGroup( 'sysop' );
 937                         $user->addGroup( 'bureaucrat' );
 938                         $user->saveSettings();
 939                 }
 940                 return Status::newGood();
 941         }
 942
 943         public function installLocalsettings() {
 944                 $localSettings = new LocalSettingsGenerator( $this );
 945                 return $localSettings->writeLocalSettings();
 946         }
 947
 948         /**
 949          * Determine if LocalSettings exists. If it does, return an appropriate
 950          * status for whether we should can upgrade or not
 951          * @return Status
 952          */
 953         function getLocalSettingsStatus() {
 954                 global $IP;
 955
 956                 $status = Status::newGood();
 957
 958                 wfSuppressWarnings();
 959                 $ls = file_exists( "$IP/LocalSettings.php" );
 960                 wfRestoreWarnings();
 961
 962                 if( $ls ) {
 963                         if( $this->parent->getDBInstaller()->needsUpgrade() ) {
 964                                 $status->warning( 'config-localsettings-upgrade' );
 965                         }
 966                         else {
 967                                 $status->fatal( 'config-localsettings-noupgrade' );
 968                         }
 969                 }
 970                 return $status;
 971         }
 972
 973         /**
 974          * On POSIX systems return the primary group of the webserver we're running under.
 975          * On other systems just returns null.
 976          *
 977          * This is used to advice the user that he should chgrp his config/data/images directory as the
 978          * webserver user before he can install.
 979          *
 980          * Public because SqliteInstaller needs it, and doesn't subclass Installer.
 981          *
 982          * @return String
 983          */
 984         public static function maybeGetWebserverPrimaryGroup() {
 985                 if ( ! function_exists('posix_getegid') || ! function_exists('posix_getpwuid') ) {
 986                         # I don't know this, this isn't UNIX
 987                         return null;
 988                 }
 989
 990                 # posix_getegid() *not* getmygid() because we want the group of the webserver,
 991                 # not whoever owns the current script
 992                 $gid = posix_getegid();
 993                 $getpwuid = posix_getpwuid( $gid );
 994                 $group = $getpwuid["name"];
 995
 996                 return $group;
 997         }
 998
 999         /**
1000          * Override the necessary bits of the config to run an installation
1001          */
1002         public static function overrideConfig() {
1003                 define( 'MW_NO_SESSION', 1 );
1004
1005                 // Don't access the database
1006                 $GLOBALS['wgUseDatabaseMessages'] = false;
1007                 // Debug-friendly
1008                 $GLOBALS['wgShowExceptionDetails'] = true;
1009                 // Don't break forms
1010                 $GLOBALS['wgExternalLinkTarget'] = '_blank';
1011
1012                 // Extended debugging. Maybe disable before release?
1013                 $GLOBALS['wgShowSQLErrors'] = true;
1014                 $GLOBALS['wgShowDBErrorBacktrace'] = true;
1015         }
1016 }