includes/specials/SpecialUserlogin.php

   1 <?php
   2 /**
   3  * @file
   4  * @ingroup SpecialPage
   5  */
   6
   7 /**
   8  * constructor
   9  */
  10 function wfSpecialUserlogin( $par = '' ) {
  11         global $wgRequest;
  12         if( session_id() == '' ) {
  13                 wfSetupSession();
  14         }
  15
  16         $form = new LoginForm( $wgRequest, $par );
  17         $form->execute();
  18 }
  19
  20 /**
  21  * implements Special:Login
  22  * @ingroup SpecialPage
  23  */
  24 class LoginForm {
  25
  26         const SUCCESS = 0;
  27         const NO_NAME = 1;
  28         const ILLEGAL = 2;
  29         const WRONG_PLUGIN_PASS = 3;
  30         const NOT_EXISTS = 4;
  31         const WRONG_PASS = 5;
  32         const EMPTY_PASS = 6;
  33         const RESET_PASS = 7;
  34         const ABORTED = 8;
  35         const CREATE_BLOCKED = 9;
  36         const THROTTLED = 10;
  37         const USER_BLOCKED = 11;
  38         const NEED_TOKEN = 12;
  39         const WRONG_TOKEN = 13;
  40
  41         var $mName, $mPassword, $mRetype, $mReturnTo, $mCookieCheck, $mPosted;
  42         var $mAction, $mCreateaccount, $mCreateaccountMail, $mMailmypassword;
  43         var $mLoginattempt, $mRemember, $mEmail, $mDomain, $mLanguage;
  44         var $mSkipCookieCheck, $mReturnToQuery, $mToken;
  45
  46         private $mExtUser = null;
  47
  48         /**
  49          * Constructor
  50          * @param $request WebRequest: a WebRequest object passed by reference
  51          * @param $par String: subpage parameter
  52          */
  53         function LoginForm( &$request, $par = '' ) {
  54                 global $wgAuth, $wgHiddenPrefs, $wgEnableEmail, $wgRedirectOnLogin;
  55
  56                 $this->mType = ( $par == 'signup' ) ? $par : $request->getText( 'type' ); # Check for [[Special:Userlogin/signup]]
  57                 $this->mName = $request->getText( 'wpName' );
  58                 $this->mPassword = $request->getText( 'wpPassword' );
  59                 $this->mRetype = $request->getText( 'wpRetype' );
  60                 $this->mDomain = $request->getText( 'wpDomain' );
  61                 $this->mReturnTo = $request->getVal( 'returnto' );
  62                 $this->mReturnToQuery = $request->getVal( 'returntoquery' );
  63                 $this->mCookieCheck = $request->getVal( 'wpCookieCheck' );
  64                 $this->mPosted = $request->wasPosted();
  65                 $this->mCreateaccount = $request->getCheck( 'wpCreateaccount' );
  66                 $this->mCreateaccountMail = $request->getCheck( 'wpCreateaccountMail' )
  67                                             && $wgEnableEmail;
  68                 $this->mMailmypassword = $request->getCheck( 'wpMailmypassword' )
  69                                          && $wgEnableEmail;
  70                 $this->mLoginattempt = $request->getCheck( 'wpLoginattempt' );
  71                 $this->mAction = $request->getVal( 'action' );
  72                 $this->mRemember = $request->getCheck( 'wpRemember' );
  73                 $this->mLanguage = $request->getText( 'uselang' );
  74                 $this->mSkipCookieCheck = $request->getCheck( 'wpSkipCookieCheck' );
  75                 $this->mToken = ($this->mType == 'signup' ) ? $request->getVal( 'wpCreateaccountToken' ) : $request->getVal( 'wpLoginToken' );
  76
  77                 if ( $wgRedirectOnLogin ) {
  78                         $this->mReturnTo = $wgRedirectOnLogin;
  79                         $this->mReturnToQuery = '';
  80                 }
  81
  82                 if( $wgEnableEmail ) {
  83                         $this->mEmail = $request->getText( 'wpEmail' );
  84                 } else {
  85                         $this->mEmail = '';
  86                 }
  87                 if( !in_array( 'realname', $wgHiddenPrefs ) ) {
  88                     $this->mRealName = $request->getText( 'wpRealName' );
  89                 } else {
  90                     $this->mRealName = '';
  91                 }
  92
  93                 if( !$wgAuth->validDomain( $this->mDomain ) ) {
  94                         $this->mDomain = 'invaliddomain';
  95                 }
  96                 $wgAuth->setDomain( $this->mDomain );
  97
  98                 # When switching accounts, it sucks to get automatically logged out
  99                 $returnToTitle = Title::newFromText( $this->mReturnTo );
 100                 if( is_object( $returnToTitle ) && $returnToTitle->isSpecial( 'Userlogout' ) ) {
 101                         $this->mReturnTo = '';
 102                         $this->mReturnToQuery = '';
 103                 }
 104         }
 105
 106         function execute() {
 107                 if ( !is_null( $this->mCookieCheck ) ) {
 108                         $this->onCookieRedirectCheck( $this->mCookieCheck );
 109                         return;
 110                 } else if( $this->mPosted ) {
 111                         if( $this->mCreateaccount ) {
 112                                 return $this->addNewAccount();
 113                         } else if ( $this->mCreateaccountMail ) {
 114                                 return $this->addNewAccountMailPassword();
 115                         } else if ( $this->mMailmypassword ) {
 116                                 return $this->mailPassword();
 117                         } else if ( ( 'submitlogin' == $this->mAction ) || $this->mLoginattempt ) {
 118                                 return $this->processLogin();
 119                         }
 120                 }
 121                 $this->mainLoginForm( '' );
 122         }
 123
 124         /**
 125          * @private
 126          */
 127         function addNewAccountMailPassword() {
 128                 global $wgOut;
 129
 130                 if ( $this->mEmail == '' ) {
 131                         $this->mainLoginForm( wfMsg( 'noemail', htmlspecialchars( $this->mName ) ) );
 132                         return;
 133                 }
 134
 135                 $u = $this->addNewaccountInternal();
 136
 137                 if ($u == null) {
 138                         return;
 139                 }
 140
 141                 // Wipe the initial password and mail a temporary one
 142                 $u->setPassword( null );
 143                 $u->saveSettings();
 144                 $result = $this->mailPasswordInternal( $u, false, 'createaccount-title', 'createaccount-text' );
 145
 146                 wfRunHooks( 'AddNewAccount', array( $u, true ) );
 147                 $u->addNewUserLogEntry();
 148
 149                 $wgOut->setPageTitle( wfMsg( 'accmailtitle' ) );
 150                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
 151                 $wgOut->setArticleRelated( false );
 152
 153                 if( WikiError::isError( $result ) ) {
 154                         $this->mainLoginForm( wfMsg( 'mailerror', $result->getMessage() ) );
 155                 } else {
 156                         $wgOut->addWikiMsg( 'accmailtext', $u->getName(), $u->getEmail() );
 157                         $wgOut->returnToMain( false );
 158                 }
 159                 $u = 0;
 160         }
 161
 162
 163         /**
 164          * @private
 165          */
 166         function addNewAccount() {
 167                 global $wgUser, $wgEmailAuthentication;
 168
 169                 # Create the account and abort if there's a problem doing so
 170                 $u = $this->addNewAccountInternal();
 171                 if( $u == null )
 172                         return;
 173
 174                 # If we showed up language selection links, and one was in use, be
 175                 # smart (and sensible) and save that language as the user's preference
 176                 global $wgLoginLanguageSelector;
 177                 if( $wgLoginLanguageSelector && $this->mLanguage )
 178                         $u->setOption( 'language', $this->mLanguage );
 179
 180                 # Send out an email authentication message if needed
 181                 if( $wgEmailAuthentication && User::isValidEmailAddr( $u->getEmail() ) ) {
 182                         global $wgOut;
 183                         $error = $u->sendConfirmationMail();
 184                         if( WikiError::isError( $error ) ) {
 185                                 $wgOut->addWikiMsg( 'confirmemail_sendfailed', $error->getMessage() );
 186                         } else {
 187                                 $wgOut->addWikiMsg( 'confirmemail_oncreate' );
 188                         }
 189                 }
 190
 191                 # Save settings (including confirmation token)
 192                 $u->saveSettings();
 193
 194                 # If not logged in, assume the new account as the current one and set
 195                 # session cookies then show a "welcome" message or a "need cookies"
 196                 # message as needed
 197                 if( $wgUser->isAnon() ) {
 198                         $wgUser = $u;
 199                         $wgUser->setCookies();
 200                         wfRunHooks( 'AddNewAccount', array( $wgUser, false ) );
 201                         $wgUser->addNewUserLogEntry();
 202                         if( $this->hasSessionCookie() ) {
 203                                 return $this->successfulCreation();
 204                         } else {
 205                                 return $this->cookieRedirectCheck( 'new' );
 206                         }
 207                 } else {
 208                         # Confirm that the account was created
 209                         global $wgOut;
 210                         $self = SpecialPage::getTitleFor( 'Userlogin' );
 211                         $wgOut->setPageTitle( wfMsgHtml( 'accountcreated' ) );
 212                         $wgOut->setArticleRelated( false );
 213                         $wgOut->setRobotPolicy( 'noindex,nofollow' );
 214                         $wgOut->addHTML( wfMsgWikiHtml( 'accountcreatedtext', $u->getName() ) );
 215                         $wgOut->returnToMain( false, $self );
 216                         wfRunHooks( 'AddNewAccount', array( $u, false ) );
 217                         $u->addNewUserLogEntry();
 218                         return true;
 219                 }
 220         }
 221
 222         /**
 223          * @private
 224          */
 225         function addNewAccountInternal() {
 226                 global $wgUser, $wgOut;
 227                 global $wgMemc, $wgAccountCreationThrottle;
 228                 global $wgAuth, $wgMinimalPasswordLength;
 229                 global $wgEmailConfirmToEdit;
 230
 231                 // If the user passes an invalid domain, something is fishy
 232                 if( !$wgAuth->validDomain( $this->mDomain ) ) {
 233                         $this->mainLoginForm( wfMsg( 'wrongpassword' ) );
 234                         return false;
 235                 }
 236
 237                 // If we are not allowing users to login locally, we should be checking
 238                 // to see if the user is actually able to authenticate to the authenti-
 239                 // cation server before they create an account (otherwise, they can
 240                 // create a local account and login as any domain user). We only need
 241                 // to check this for domains that aren't local.
 242                 if( 'local' != $this->mDomain && $this->mDomain != '' ) {
 243                         if( !$wgAuth->canCreateAccounts() && ( !$wgAuth->userExists( $this->mName ) || !$wgAuth->authenticate( $this->mName, $this->mPassword ) ) ) {
 244                                 $this->mainLoginForm( wfMsg( 'wrongpassword' ) );
 245                                 return false;
 246                         }
 247                 }
 248
 249                 if ( wfReadOnly() ) {
 250                         $wgOut->readOnlyPage();
 251                         return false;
 252                 }
 253
 254                 # Request forgery checks.
 255                 if ( !self::getCreateaccountToken() ) {
 256                         self::setCreateaccountToken();
 257                         $this->mainLoginForm( wfMsg( 'sessionfailure' ) );
 258                         return false;
 259                 }
 260
 261                 # The user didn't pass a createaccount token
 262                 if ( !$this->mToken ) {
 263                         $this->mainLoginForm( wfMsg( 'sessionfailure' ) );
 264                         return false;
 265                 }
 266
 267                 # Validate the createaccount token
 268                 if ( $this->mToken !== self::getCreateaccountToken() ) {
 269                         $this->mainLoginForm( wfMsg( 'sessionfailure' ) );
 270                         return false;
 271                 }
 272
 273                 # Check permissions
 274                 if ( !$wgUser->isAllowed( 'createaccount' ) ) {
 275                         $this->userNotPrivilegedMessage();
 276                         return false;
 277                 } elseif ( $wgUser->isBlockedFromCreateAccount() ) {
 278                         $this->userBlockedMessage();
 279                         return false;
 280                 }
 281
 282                 $ip = wfGetIP();
 283                 if ( $wgUser->isDnsBlacklisted( $ip, true /* check $wgProxyWhitelist */ ) ) {
 284                         $this->mainLoginForm( wfMsg( 'sorbs_create_account_reason' ) . ' (' . htmlspecialchars( $ip ) . ')' );
 285                         return false;
 286                 }
 287
 288                 # Now create a dummy user ($u) and check if it is valid
 289                 $name = trim( $this->mName );
 290                 $u = User::newFromName( $name, 'creatable' );
 291                 if ( !is_object( $u ) ) {
 292                         $this->mainLoginForm( wfMsg( 'noname' ) );
 293                         return false;
 294                 }
 295
 296                 if ( 0 != $u->idForName() ) {
 297                         $this->mainLoginForm( wfMsg( 'userexists' ) );
 298                         return false;
 299                 }
 300
 301                 if ( 0 != strcmp( $this->mPassword, $this->mRetype ) ) {
 302                         $this->mainLoginForm( wfMsg( 'badretype' ) );
 303                         return false;
 304                 }
 305
 306                 # check for minimal password length
 307                 $valid = $u->getPasswordValidity( $this->mPassword );
 308                 if ( $valid !== true ) {
 309                         if ( !$this->mCreateaccountMail ) {
 310                                 $this->mainLoginForm( wfMsgExt( $valid, array( 'parsemag' ), $wgMinimalPasswordLength ) );
 311                                 return false;
 312                         } else {
 313                                 # do not force a password for account creation by email
 314                                 # set invalid password, it will be replaced later by a random generated password
 315                                 $this->mPassword = null;
 316                         }
 317                 }
 318
 319                 # if you need a confirmed email address to edit, then obviously you
 320                 # need an email address.
 321                 if ( $wgEmailConfirmToEdit && empty( $this->mEmail ) ) {
 322                         $this->mainLoginForm( wfMsg( 'noemailtitle' ) );
 323                         return false;
 324                 }
 325
 326                 if( !empty( $this->mEmail ) && !User::isValidEmailAddr( $this->mEmail ) ) {
 327                         $this->mainLoginForm( wfMsg( 'invalidemailaddress' ) );
 328                         return false;
 329                 }
 330
 331                 # Set some additional data so the AbortNewAccount hook can be used for
 332                 # more than just username validation
 333                 $u->setEmail( $this->mEmail );
 334                 $u->setRealName( $this->mRealName );
 335
 336                 $abortError = '';
 337                 if( !wfRunHooks( 'AbortNewAccount', array( $u, &$abortError ) ) ) {
 338                         // Hook point to add extra creation throttles and blocks
 339                         wfDebug( "LoginForm::addNewAccountInternal: a hook blocked creation\n" );
 340                         $this->mainLoginForm( $abortError );
 341                         return false;
 342                 }
 343
 344                 if ( $wgAccountCreationThrottle && $wgUser->isPingLimitable() ) {
 345                         $key = wfMemcKey( 'acctcreate', 'ip', $ip );
 346                         $value = $wgMemc->get( $key );
 347                         if ( !$value ) {
 348                                 $wgMemc->set( $key, 0, 86400 );
 349                         }
 350                         if ( $value >= $wgAccountCreationThrottle ) {
 351                                 $this->throttleHit( $wgAccountCreationThrottle );
 352                                 return false;
 353                         }
 354                         $wgMemc->incr( $key );
 355                 }
 356
 357                 if( !$wgAuth->addUser( $u, $this->mPassword, $this->mEmail, $this->mRealName ) ) {
 358                         $this->mainLoginForm( wfMsg( 'externaldberror' ) );
 359                         return false;
 360                 }
 361
 362                 self::clearCreateaccountToken();
 363                 return $this->initUser( $u, false );
 364         }
 365
 366         /**
 367          * Actually add a user to the database.
 368          * Give it a User object that has been initialised with a name.
 369          *
 370          * @param $u User object.
 371          * @param $autocreate boolean -- true if this is an autocreation via auth plugin
 372          * @return User object.
 373          * @private
 374          */
 375         function initUser( $u, $autocreate ) {
 376                 global $wgAuth;
 377
 378                 $u->addToDatabase();
 379
 380                 if ( $wgAuth->allowPasswordChange() ) {
 381                         $u->setPassword( $this->mPassword );
 382                 }
 383
 384                 $u->setEmail( $this->mEmail );
 385                 $u->setRealName( $this->mRealName );
 386                 $u->setToken();
 387
 388                 $wgAuth->initUser( $u, $autocreate );
 389
 390                 if ( $this->mExtUser ) {
 391                         $this->mExtUser->linkToLocal( $u->getId() );
 392                         $email = $this->mExtUser->getPref( 'emailaddress' );
 393                         if ( $email && !$this->mEmail ) {
 394                                 $u->setEmail( $email );
 395                         }
 396                 }
 397
 398                 $u->setOption( 'rememberpassword', $this->mRemember ? 1 : 0 );
 399                 $u->saveSettings();
 400
 401                 # Update user count
 402                 $ssUpdate = new SiteStatsUpdate( 0, 0, 0, 0, 1 );
 403                 $ssUpdate->doUpdate();
 404
 405                 return $u;
 406         }
 407
 408         /**
 409          * Internally authenticate the login request.
 410          *
 411          * This may create a local account as a side effect if the
 412          * authentication plugin allows transparent local account
 413          * creation.
 414          */
 415         public function authenticateUserData() {
 416                 global $wgUser, $wgAuth;
 417                 if ( $this->mName == '' ) {
 418                         return self::NO_NAME;
 419                 }
 420
 421                 // We require a login token to prevent login CSRF
 422                 // Handle part of this before incrementing the throttle so
 423                 // token-less login attempts don't count towards the throttle
 424                 // but wrong-token attempts do.
 425
 426                 // If the user doesn't have a login token yet, set one.
 427                 if ( !self::getLoginToken() ) {
 428                         self::setLoginToken();
 429                         return self::NEED_TOKEN;
 430                 }
 431                 // If the user didn't pass a login token, tell them we need one
 432                 if ( !$this->mToken ) {
 433                         return self::NEED_TOKEN;
 434                 }
 435
 436                 global $wgPasswordAttemptThrottle;
 437
 438                 $throttleCount = 0;
 439                 if ( is_array( $wgPasswordAttemptThrottle ) ) {
 440                         $throttleKey = wfMemcKey( 'password-throttle', wfGetIP(), md5( $this->mName ) );
 441                         $count = $wgPasswordAttemptThrottle['count'];
 442                         $period = $wgPasswordAttemptThrottle['seconds'];
 443
 444                         global $wgMemc;
 445                         $throttleCount = $wgMemc->get( $throttleKey );
 446                         if ( !$throttleCount ) {
 447                                 $wgMemc->add( $throttleKey, 1, $period ); // start counter
 448                         } else if ( $throttleCount < $count ) {
 449                                 $wgMemc->incr($throttleKey);
 450                         } else if ( $throttleCount >= $count ) {
 451                                 return self::THROTTLED;
 452                         }
 453                 }
 454
 455                 // Validate the login token
 456                 if ( $this->mToken !== self::getLoginToken() ) {
 457                         return self::WRONG_TOKEN;
 458                 }
 459
 460                 // Load $wgUser now, and check to see if we're logging in as the same
 461                 // name. This is necessary because loading $wgUser (say by calling
 462                 // getName()) calls the UserLoadFromSession hook, which potentially
 463                 // creates the user in the database. Until we load $wgUser, checking
 464                 // for user existence using User::newFromName($name)->getId() below
 465                 // will effectively be using stale data.
 466                 if ( $wgUser->getName() === $this->mName ) {
 467                         wfDebug( __METHOD__.": already logged in as {$this->mName}\n" );
 468                         return self::SUCCESS;
 469                 }
 470
 471                 $this->mExtUser = ExternalUser::newFromName( $this->mName );
 472
 473                 # TODO: Allow some magic here for invalid external names, e.g., let the
 474                 # user choose a different wiki name.
 475                 $u = User::newFromName( $this->mName );
 476                 if( !( $u instanceof User ) || !User::isUsableName( $u->getName() ) ) {
 477                         return self::ILLEGAL;
 478                 }
 479
 480                 $isAutoCreated = false;
 481                 if ( 0 == $u->getID() ) {
 482                         $status = $this->attemptAutoCreate( $u );
 483                         if ( $status !== self::SUCCESS ) {
 484                                 return $status;
 485                         } else {
 486                                 $isAutoCreated = true;
 487                         }
 488                 } else {
 489                         global $wgExternalAuthType, $wgAutocreatePolicy;
 490                         if ( $wgExternalAuthType && $wgAutocreatePolicy != 'never'
 491                         && is_object( $this->mExtUser )
 492                         && $this->mExtUser->authenticate( $this->mPassword ) ) {
 493                                 # The external user and local user have the same name and
 494                                 # password, so we assume they're the same.
 495                                 $this->mExtUser->linkToLocal( $u->getID() );
 496                         }
 497
 498                         $u->load();
 499                 }
 500
 501                 // Give general extensions, such as a captcha, a chance to abort logins
 502                 $abort = self::ABORTED;
 503                 if( !wfRunHooks( 'AbortLogin', array( $u, $this->mPassword, &$abort ) ) ) {
 504                         return $abort;
 505                 }
 506
 507                 global $wgBlockDisablesLogin;
 508                 if (!$u->checkPassword( $this->mPassword )) {
 509                         if( $u->checkTemporaryPassword( $this->mPassword ) ) {
 510                                 // The e-mailed temporary password should not be used for actu-
 511                                 // al logins; that's a very sloppy habit, and insecure if an
 512                                 // attacker has a few seconds to click "search" on someone's o-
 513                                 // pen mail reader.
 514                                 //
 515                                 // Allow it to be used only to reset the password a single time
 516                                 // to a new value, which won't be in the user's e-mail ar-
 517                                 // chives.
 518                                 //
 519                                 // For backwards compatibility, we'll still recognize it at the
 520                                 // login form to minimize surprises for people who have been
 521                                 // logging in with a temporary password for some time.
 522                                 //
 523                                 // As a side-effect, we can authenticate the user's e-mail ad-
 524                                 // dress if it's not already done, since the temporary password
 525                                 // was sent via e-mail.
 526                                 if( !$u->isEmailConfirmed() ) {
 527                                         $u->confirmEmail();
 528                                         $u->saveSettings();
 529                                 }
 530
 531                                 // At this point we just return an appropriate code/ indicating
 532                                 // that the UI should show a password reset form; bot inter-
 533                                 // faces etc will probably just fail cleanly here.
 534                                 $retval = self::RESET_PASS;
 535                         } else {
 536                                 $retval = ($this->mPassword  == '') ? self::EMPTY_PASS : self::WRONG_PASS;
 537                         }
 538                 } elseif ( $wgBlockDisablesLogin && $u->isBlocked() ) {
 539                         // If we've enabled it, make it so that a blocked user cannot login
 540                         $retval = self::USER_BLOCKED;
 541                 } else {
 542                         $wgAuth->updateUser( $u );
 543                         $wgUser = $u;
 544
 545                         // Please reset throttle for successful logins, thanks!
 546                         if($throttleCount) {
 547                                 $wgMemc->delete($throttleKey);
 548                         }
 549
 550                         if ( $isAutoCreated ) {
 551                                 // Must be run after $wgUser is set, for correct new user log
 552                                 wfRunHooks( 'AuthPluginAutoCreate', array( $wgUser ) );
 553                         }
 554
 555                         $retval = self::SUCCESS;
 556                 }
 557                 wfRunHooks( 'LoginAuthenticateAudit', array( $u, $this->mPassword, $retval ) );
 558                 return $retval;
 559         }
 560
 561         /**
 562          * Attempt to automatically create a user on login. Only succeeds if there
 563          * is an external authentication method which allows it.
 564          * @return integer Status code
 565          */
 566         function attemptAutoCreate( $user ) {
 567                 global $wgAuth, $wgUser, $wgAutocreatePolicy;
 568
 569                 if ( $wgUser->isBlockedFromCreateAccount() ) {
 570                         wfDebug( __METHOD__.": user is blocked from account creation\n" );
 571                         return self::CREATE_BLOCKED;
 572                 }
 573
 574                 /**
 575                  * If the external authentication plugin allows it, automatically cre-
 576                  * ate a new account for users that are externally defined but have not
 577                  * yet logged in.
 578                  */
 579                 if ( $this->mExtUser ) {
 580                         # mExtUser is neither null nor false, so use the new ExternalAuth
 581                         # system.
 582                         if ( $wgAutocreatePolicy == 'never' ) {
 583                                 return self::NOT_EXISTS;
 584                         }
 585                         if ( !$this->mExtUser->authenticate( $this->mPassword ) ) {
 586                                 return self::WRONG_PLUGIN_PASS;
 587                         }
 588                 } else {
 589                         # Old AuthPlugin.
 590                         if ( !$wgAuth->autoCreate() ) {
 591                                 return self::NOT_EXISTS;
 592                         }
 593                         if ( !$wgAuth->userExists( $user->getName() ) ) {
 594                                 wfDebug( __METHOD__.": user does not exist\n" );
 595                                 return self::NOT_EXISTS;
 596                         }
 597                         if ( !$wgAuth->authenticate( $user->getName(), $this->mPassword ) ) {
 598                                 wfDebug( __METHOD__.": \$wgAuth->authenticate() returned false, aborting\n" );
 599                                 return self::WRONG_PLUGIN_PASS;
 600                         }
 601                 }
 602
 603                 wfDebug( __METHOD__.": creating account\n" );
 604                 $user = $this->initUser( $user, true );
 605                 return self::SUCCESS;
 606         }
 607
 608         function processLogin() {
 609                 global $wgUser, $wgAuth;
 610
 611                 switch ( $this->authenticateUserData() ) {
 612                         case self::SUCCESS:
 613                                 # We've verified now, update the real record
 614                                 if( (bool)$this->mRemember != (bool)$wgUser->getOption( 'rememberpassword' ) ) {
 615                                         $wgUser->setOption( 'rememberpassword', $this->mRemember ? 1 : 0 );
 616                                         $wgUser->saveSettings();
 617                                 } else {
 618                                         $wgUser->invalidateCache();
 619                                 }
 620                                 $wgUser->setCookies();
 621                                 self::clearLoginToken();
 622
 623                                 // Reset the throttle
 624                                 $key = wfMemcKey( 'password-throttle', wfGetIP(), md5( $this->mName ) );
 625                                 global $wgMemc;
 626                                 $wgMemc->delete( $key );
 627
 628                                 if( $this->hasSessionCookie() || $this->mSkipCookieCheck ) {
 629                                         /* Replace the language object to provide user interface in
 630                                          * correct language immediately on this first page load.
 631                                          */
 632                                         global $wgLang, $wgRequest;
 633                                         $code = $wgRequest->getVal( 'uselang', $wgUser->getOption( 'language' ) );
 634                                         $wgLang = Language::factory( $code );
 635                                         return $this->successfulLogin();
 636                                 } else {
 637                                         return $this->cookieRedirectCheck( 'login' );
 638                                 }
 639                                 break;
 640
 641                         case self::NEED_TOKEN:
 642                         case self::WRONG_TOKEN:
 643                                 $this->mainLoginForm( wfMsg( 'sessionfailure' ) );
 644                                 break;
 645                         case self::NO_NAME:
 646                         case self::ILLEGAL:
 647                                 $this->mainLoginForm( wfMsg( 'noname' ) );
 648                                 break;
 649                         case self::WRONG_PLUGIN_PASS:
 650                                 $this->mainLoginForm( wfMsg( 'wrongpassword' ) );
 651                                 break;
 652                         case self::NOT_EXISTS:
 653                                 if( $wgUser->isAllowed( 'createaccount' ) ){
 654                                         $this->mainLoginForm( wfMsgWikiHtml( 'nosuchuser', htmlspecialchars( $this->mName ) ) );
 655                                 } else {
 656                                         $this->mainLoginForm( wfMsg( 'nosuchusershort', htmlspecialchars( $this->mName ) ) );
 657                                 }
 658                                 break;
 659                         case self::WRONG_PASS:
 660                                 $this->mainLoginForm( wfMsg( 'wrongpassword' ) );
 661                                 break;
 662                         case self::EMPTY_PASS:
 663                                 $this->mainLoginForm( wfMsg( 'wrongpasswordempty' ) );
 664                                 break;
 665                         case self::RESET_PASS:
 666                                 $this->resetLoginForm( wfMsg( 'resetpass_announce' ) );
 667                                 break;
 668                         case self::CREATE_BLOCKED:
 669                                 $this->userBlockedMessage();
 670                                 break;
 671                         case self::THROTTLED:
 672                                 $this->mainLoginForm( wfMsg( 'login-throttled' ) );
 673                                 break;
 674                         case self::USER_BLOCKED:
 675                                 $this->mainLoginForm( wfMsgExt( 'login-userblocked',
 676                                         array( 'parsemag', 'escape' ), $this->mName ) );
 677                                 break;
 678                         default:
 679                                 throw new MWException( "Unhandled case value" );
 680                 }
 681         }
 682
 683         function resetLoginForm( $error ) {
 684                 global $wgOut;
 685                 $wgOut->addHTML( Xml::element('p', array( 'class' => 'error' ), $error ) );
 686                 $reset = new SpecialResetpass();
 687                 $reset->execute( null );
 688         }
 689
 690         /**
 691          * @private
 692          */
 693         function mailPassword() {
 694                 global $wgUser, $wgOut, $wgAuth;
 695
 696                 if ( wfReadOnly() ) {
 697                         $wgOut->readOnlyPage();
 698                         return false;
 699                 }
 700
 701                 if( !$wgAuth->allowPasswordChange() ) {
 702                         $this->mainLoginForm( wfMsg( 'resetpass_forbidden' ) );
 703                         return;
 704                 }
 705
 706                 # Check against blocked IPs so blocked users can't flood admins
 707                 # with password resets
 708                 if( $wgUser->isBlocked() ) {
 709                         $this->mainLoginForm( wfMsg( 'blocked-mailpassword' ) );
 710                         return;
 711                 }
 712
 713                 # Check for hooks
 714                 $error = null;
 715                 if ( ! wfRunHooks( 'UserLoginMailPassword', array( $this->mName, &$error ) ) ) {
 716                         $this->mainLoginForm( $error );
 717                         return;
 718                 }
 719
 720                 # If the user doesn't have a login token yet, set one.
 721                 if ( !self::getLoginToken() ) {
 722                         self::setLoginToken();
 723                         $this->mainLoginForm( wfMsg( 'sessionfailure' ) );
 724                         return;
 725                 }
 726
 727                 # If the user didn't pass a login token, tell them we need one
 728                 if ( !$this->mToken ) {
 729                         $this->mainLoginForm( wfMsg( 'sessionfailure' ) );
 730                         return;
 731                 }
 732
 733                 # Check against the rate limiter
 734                 if( $wgUser->pingLimiter( 'mailpassword' ) ) {
 735                         $wgOut->rateLimited();
 736                         return;
 737                 }
 738
 739                 if ( $this->mName == '' ) {
 740                         $this->mainLoginForm( wfMsg( 'noname' ) );
 741                         return;
 742                 }
 743                 $u = User::newFromName( $this->mName );
 744                 if( !$u instanceof User ) {
 745                         $this->mainLoginForm( wfMsg( 'noname' ) );
 746                         return;
 747                 }
 748                 if ( 0 == $u->getID() ) {
 749                         $this->mainLoginForm( wfMsgWikiHtml( 'nosuchuser', htmlspecialchars( $u->getName() ) ) );
 750                         return;
 751                 }
 752
 753                 # Validate the login token
 754                 if ( $this->mToken !== self::getLoginToken() ) {
 755                         $this->mainLoginForm( wfMsg( 'sessionfailure' ) );
 756                         return;
 757                 }
 758
 759                 # Check against password throttle
 760                 if ( $u->isPasswordReminderThrottled() ) {
 761                         global $wgPasswordReminderResendTime;
 762                         # Round the time in hours to 3 d.p., in case someone is specifying
 763                         # minutes or seconds.
 764                         $this->mainLoginForm( wfMsgExt( 'throttled-mailpassword', array( 'parsemag' ),
 765                                 round( $wgPasswordReminderResendTime, 3 ) ) );
 766                         return;
 767                 }
 768
 769                 $result = $this->mailPasswordInternal( $u, true, 'passwordremindertitle', 'passwordremindertext' );
 770                 if( WikiError::isError( $result ) ) {
 771                         $this->mainLoginForm( wfMsg( 'mailerror', $result->getMessage() ) );
 772                 } else {
 773                         $this->mainLoginForm( wfMsg( 'passwordsent', $u->getName() ), 'success' );
 774                         self::clearLoginToken();
 775                 }
 776         }
 777
 778
 779         /**
 780          * @param $u User object
 781          * @param $throttle Boolean
 782          * @param $emailTitle String: message name of email title
 783          * @param $emailText String: message name of email text
 784          * @return Mixed: true on success, WikiError on failure
 785          * @private
 786          */
 787         function mailPasswordInternal( $u, $throttle = true, $emailTitle = 'passwordremindertitle', $emailText = 'passwordremindertext' ) {
 788                 global $wgServer, $wgScript, $wgUser, $wgNewPasswordExpiry;
 789
 790                 if ( $u->getEmail() == '' ) {
 791                         return new WikiError( wfMsg( 'noemail', $u->getName() ) );
 792                 }
 793                 $ip = wfGetIP();
 794                 if( !$ip ) {
 795                         return new WikiError( wfMsg( 'badipaddress' ) );
 796                 }
 797
 798                 wfRunHooks( 'User::mailPasswordInternal', array(&$wgUser, &$ip, &$u) );
 799
 800                 $np = $u->randomPassword();
 801                 $u->setNewpassword( $np, $throttle );
 802                 $u->saveSettings();
 803                 $userLanguage = $u->getOption( 'language' );
 804                 $m = wfMsgExt( $emailText, array( 'parsemag', 'language' => $userLanguage ), $ip, $u->getName(), $np,
 805                                 $wgServer . $wgScript, round( $wgNewPasswordExpiry / 86400 ) );
 806                 $result = $u->sendMail( wfMsgExt( $emailTitle, array( 'parsemag', 'language' => $userLanguage ) ), $m );
 807
 808                 return $result;
 809         }
 810
 811
 812         /**
 813          * Run any hooks registered for logins, then HTTP redirect to
 814          * $this->mReturnTo (or Main Page if that's undefined).  Formerly we had a
 815          * nice message here, but that's really not as useful as just being sent to
 816          * wherever you logged in from.  It should be clear that the action was
 817          * successful, given the lack of error messages plus the appearance of your
 818          * name in the upper right.
 819          *
 820          * @private
 821          */
 822         function successfulLogin() {
 823                 global $wgUser, $wgOut;
 824
 825                 # Run any hooks; display injected HTML if any, else redirect
 826                 $injected_html = '';
 827                 wfRunHooks('UserLoginComplete', array(&$wgUser, &$injected_html));
 828
 829                 if( $injected_html !== '' ) {
 830                         $this->displaySuccessfulLogin( 'loginsuccess', $injected_html );
 831                 } else {
 832                         $titleObj = Title::newFromText( $this->mReturnTo );
 833                         if ( !$titleObj instanceof Title ) {
 834                                 $titleObj = Title::newMainPage();
 835                         }
 836                         $wgOut->redirect( $titleObj->getFullURL( $this->mReturnToQuery ) );
 837                 }
 838         }
 839
 840         /**
 841          * Run any hooks registered for logins, then display a message welcoming
 842          * the user.
 843          *
 844          * @private
 845          */
 846         function successfulCreation() {
 847                 global $wgUser, $wgOut;
 848
 849                 # Run any hooks; display injected HTML
 850                 $injected_html = '';
 851                 wfRunHooks('UserLoginComplete', array(&$wgUser, &$injected_html));
 852
 853                 $this->displaySuccessfulLogin( 'welcomecreation', $injected_html );
 854         }
 855
 856         /**
 857          * Display a "login successful" page.
 858          */
 859         private function displaySuccessfulLogin( $msgname, $injected_html ) {
 860                 global $wgOut, $wgUser;
 861
 862                 $wgOut->setPageTitle( wfMsg( 'loginsuccesstitle' ) );
 863                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
 864                 $wgOut->setArticleRelated( false );
 865                 $wgOut->addWikiMsg( $msgname, $wgUser->getName() );
 866                 $wgOut->addHTML( $injected_html );
 867
 868                 if ( !empty( $this->mReturnTo ) ) {
 869                         $wgOut->returnToMain( null, $this->mReturnTo, $this->mReturnToQuery );
 870                 } else {
 871                         $wgOut->returnToMain( null );
 872                 }
 873         }
 874
 875         /** */
 876         function userNotPrivilegedMessage($errors) {
 877                 global $wgOut;
 878
 879                 $wgOut->setPageTitle( wfMsg( 'permissionserrors' ) );
 880                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
 881                 $wgOut->setArticleRelated( false );
 882
 883                 $wgOut->addWikitext( $wgOut->formatPermissionsErrorMessage( $errors, 'createaccount' ) );
 884                 // Stuff that might want to be added at the end. For example, instruc-
 885                 // tions if blocked.
 886                 $wgOut->addWikiMsg( 'cantcreateaccount-nonblock-text' );
 887
 888                 $wgOut->returnToMain( false );
 889         }
 890
 891         /** */
 892         function userBlockedMessage() {
 893                 global $wgOut, $wgUser;
 894
 895                 # Let's be nice about this, it's likely that this feature will be used
 896                 # for blocking large numbers of innocent people, e.g. range blocks on
 897                 # schools. Don't blame it on the user. There's a small chance that it
 898                 # really is the user's fault, i.e. the username is blocked and they
 899                 # haven't bothered to log out before trying to create an account to
 900                 # evade it, but we'll leave that to their guilty conscience to figure
 901                 # out.
 902
 903                 $wgOut->setPageTitle( wfMsg( 'cantcreateaccounttitle' ) );
 904                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
 905                 $wgOut->setArticleRelated( false );
 906
 907                 $ip = wfGetIP();
 908                 $blocker = User::whoIs( $wgUser->mBlock->mBy );
 909                 $block_reason = $wgUser->mBlock->mReason;
 910
 911                 if ( strval( $block_reason ) === '' ) {
 912                         $block_reason = wfMsg( 'blockednoreason' );
 913                 }
 914                 $wgOut->addWikiMsg( 'cantcreateaccount-text', $ip, $block_reason, $blocker );
 915                 $wgOut->returnToMain( false );
 916         }
 917
 918         /**
 919          * @private
 920          */
 921         function mainLoginForm( $msg, $msgtype = 'error' ) {
 922                 global $wgUser, $wgOut, $wgHiddenPrefs, $wgEnableEmail;
 923                 global $wgCookiePrefix, $wgLoginLanguageSelector;
 924                 global $wgAuth, $wgEmailConfirmToEdit, $wgCookieExpiration;
 925
 926                 $titleObj = SpecialPage::getTitleFor( 'Userlogin' );
 927
 928                 if ( $this->mType == 'signup' ) {
 929                         // Block signup here if in readonly. Keeps user from
 930                         // going through the process (filling out data, etc)
 931                         // and being informed later.
 932                         if ( wfReadOnly() ) {
 933                                 $wgOut->readOnlyPage();
 934                                 return;
 935                         } elseif ( $wgUser->isBlockedFromCreateAccount() ) {
 936                                 $this->userBlockedMessage();
 937                                 return;
 938                         } elseif ( count( $permErrors = $titleObj->getUserPermissionsErrors( 'createaccount', $wgUser, true ) )>0 ) {
 939                                 $wgOut->showPermissionsErrorPage( $permErrors, 'createaccount' );
 940                                 return;
 941                         }
 942                 }
 943
 944                 if ( $this->mName == '' ) {
 945                         if ( $wgUser->isLoggedIn() ) {
 946                                 $this->mName = $wgUser->getName();
 947                         } else {
 948                                 $this->mName = isset( $_COOKIE[$wgCookiePrefix.'UserName'] ) ? $_COOKIE[$wgCookiePrefix.'UserName'] : null;
 949                         }
 950                 }
 951
 952                 $titleObj = SpecialPage::getTitleFor( 'Userlogin' );
 953
 954                 if ( $this->mType == 'signup' ) {
 955                         $template = new UsercreateTemplate();
 956                         $q = 'action=submitlogin&type=signup';
 957                         $linkq = 'type=login';
 958                         $linkmsg = 'gotaccount';
 959                 } else {
 960                         $template = new UserloginTemplate();
 961                         $q = 'action=submitlogin&type=login';
 962                         $linkq = 'type=signup';
 963                         $linkmsg = 'nologin';
 964                 }
 965
 966                 if ( !empty( $this->mReturnTo ) ) {
 967                         $returnto = '&returnto=' . wfUrlencode( $this->mReturnTo );
 968                         if ( !empty( $this->mReturnToQuery ) )
 969                                 $returnto .= '&returntoquery=' .
 970                                         wfUrlencode( $this->mReturnToQuery );
 971                         $q .= $returnto;
 972                         $linkq .= $returnto;
 973                 }
 974
 975                 # Pass any language selection on to the mode switch link
 976                 if( $wgLoginLanguageSelector && $this->mLanguage )
 977                         $linkq .= '&uselang=' . $this->mLanguage;
 978
 979                 $link = '<a href="' . htmlspecialchars ( $titleObj->getLocalUrl( $linkq ) ) . '">';
 980                 $link .= wfMsgHtml( $linkmsg . 'link' ); # Calling either 'gotaccountlink' or 'nologinlink'
 981                 $link .= '</a>';
 982
 983                 # Don't show a "create account" link if the user can't
 984                 if( $this->showCreateOrLoginLink( $wgUser ) )
 985                         $template->set( 'link', wfMsgWikiHtml( $linkmsg, $link ) );
 986                 else
 987                         $template->set( 'link', '' );
 988
 989                 $template->set( 'header', '' );
 990                 $template->set( 'name', $this->mName );
 991                 $template->set( 'password', $this->mPassword );
 992                 $template->set( 'retype', $this->mRetype );
 993                 $template->set( 'email', $this->mEmail );
 994                 $template->set( 'realname', $this->mRealName );
 995                 $template->set( 'domain', $this->mDomain );
 996
 997                 $template->set( 'action', $titleObj->getLocalUrl( $q ) );
 998                 $template->set( 'message', $msg );
 999                 $template->set( 'messagetype', $msgtype );
1000                 $template->set( 'createemail', $wgEnableEmail && $wgUser->isLoggedIn() );
1001                 $template->set( 'userealname', !in_array( 'realname', $wgHiddenPrefs ) );
1002                 $template->set( 'useemail', $wgEnableEmail );
1003                 $template->set( 'emailrequired', $wgEmailConfirmToEdit );
1004                 $template->set( 'canreset', $wgAuth->allowPasswordChange() );
1005                 $template->set( 'canremember', ( $wgCookieExpiration > 0 ) );
1006                 $template->set( 'remember', $wgUser->getOption( 'rememberpassword' ) or $this->mRemember  );
1007
1008                 if ( $this->mType == 'signup' ) {
1009                         if ( !self::getCreateaccountToken() ) {
1010                                 self::setCreateaccountToken();
1011                         }
1012                         $template->set( 'token', self::getCreateaccountToken() );
1013                 } else {
1014                         if ( !self::getLoginToken() ) {
1015                                 self::setLoginToken();
1016                         }
1017                         $template->set( 'token', self::getLoginToken() );
1018                 }
1019
1020                 # Prepare language selection links as needed
1021                 if( $wgLoginLanguageSelector ) {
1022                         $template->set( 'languages', $this->makeLanguageSelector() );
1023                         if( $this->mLanguage )
1024                                 $template->set( 'uselang', $this->mLanguage );
1025                 }
1026
1027                 // Give authentication and captcha plugins a chance to modify the form
1028                 $wgAuth->modifyUITemplate( $template, $this->mType );
1029                 if ( $this->mType == 'signup' ) {
1030                         wfRunHooks( 'UserCreateForm', array( &$template ) );
1031                 } else {
1032                         wfRunHooks( 'UserLoginForm', array( &$template ) );
1033                 }
1034
1035                 //Changes the title depending on permissions for creating account
1036                 if ( $wgUser->isAllowed( 'createaccount' ) ) {
1037                         $wgOut->setPageTitle( wfMsg( 'userlogin' ) );
1038                 } else {
1039                         $wgOut->setPageTitle( wfMsg( 'userloginnocreate' ) );
1040                 }
1041
1042                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
1043                 $wgOut->setArticleRelated( false );
1044                 $wgOut->disallowUserJs();  // just in case...
1045                 $wgOut->addTemplate( $template );
1046         }
1047
1048         /**
1049          * @private
1050          */
1051         function showCreateOrLoginLink( &$user ) {
1052                 if( $this->mType == 'signup' ) {
1053                         return( true );
1054                 } elseif( $user->isAllowed( 'createaccount' ) ) {
1055                         return( true );
1056                 } else {
1057                         return( false );
1058                 }
1059         }
1060
1061         /**
1062          * Check if a session cookie is present.
1063          *
1064          * This will not pick up a cookie set during _this_ request, but is meant
1065          * to ensure that the client is returning the cookie which was set on a
1066          * previous pass through the system.
1067          *
1068          * @private
1069          */
1070         function hasSessionCookie() {
1071                 global $wgDisableCookieCheck, $wgRequest;
1072                 return $wgDisableCookieCheck ? true : $wgRequest->checkSessionCookie();
1073         }
1074
1075         /**
1076          * Get the login token from the current session
1077          */
1078         public static function getLoginToken() {
1079                 global $wgRequest;
1080                 return $wgRequest->getSessionData( 'wsLoginToken' );
1081         }
1082
1083         /**
1084          * Randomly generate a new login token and attach it to the current session
1085          */
1086         public static function setLoginToken() {
1087                 global $wgRequest;
1088                 // Use User::generateToken() instead of $user->editToken()
1089                 // because the latter reuses $_SESSION['wsEditToken']
1090                 $wgRequest->setSessionData( 'wsLoginToken', User::generateToken() );
1091         }
1092
1093         /**
1094          * Remove any login token attached to the current session
1095          */
1096         public static function clearLoginToken() {
1097                 global $wgRequest;
1098                 $wgRequest->setSessionData( 'wsLoginToken', null );
1099         }
1100
1101         /**
1102          * Get the createaccount token from the current session
1103          */
1104         public static function getCreateaccountToken() {
1105                 global $wgRequest;
1106                 return $wgRequest->getSessionData( 'wsCreateaccountToken' );
1107         }
1108
1109         /**
1110          * Randomly generate a new createaccount token and attach it to the current session
1111          */
1112         public static function setCreateaccountToken() {
1113                 global $wgRequest;
1114                 $wgRequest->setSessionData( 'wsCreateaccountToken', User::generateToken() );
1115         }
1116
1117         /**
1118          * Remove any createaccount token attached to the current session
1119          */
1120         public static function clearCreateaccountToken() {
1121                 global $wgRequest;
1122                 $wgRequest->setSessionData( 'wsCreateaccountToken', null );
1123         }
1124
1125         /**
1126          * @private
1127          */
1128         function cookieRedirectCheck( $type ) {
1129                 global $wgOut;
1130
1131                 $titleObj = SpecialPage::getTitleFor( 'Userlogin' );
1132                 $query = array( 'wpCookieCheck' => $type );
1133                 if ( $this->mReturnTo ) $query['returnto'] = $this->mReturnTo;
1134                 $check = $titleObj->getFullURL( $query );
1135
1136                 return $wgOut->redirect( $check );
1137         }
1138
1139         /**
1140          * @private
1141          */
1142         function onCookieRedirectCheck( $type ) {
1143                 if ( !$this->hasSessionCookie() ) {
1144                         if ( $type == 'new' ) {
1145                                 return $this->mainLoginForm( wfMsgExt( 'nocookiesnew', array( 'parseinline' ) ) );
1146                         } else if ( $type == 'login' ) {
1147                                 return $this->mainLoginForm( wfMsgExt( 'nocookieslogin', array( 'parseinline' ) ) );
1148                         } else {
1149                                 # shouldn't happen
1150                                 return $this->mainLoginForm( wfMsg( 'error' ) );
1151                         }
1152                 } else {
1153                         return $this->successfulLogin();
1154                 }
1155         }
1156
1157         /**
1158          * @private
1159          */
1160         function throttleHit( $limit ) {
1161                 $this->mainLoginForm( wfMsgExt( 'acct_creation_throttle_hit', array( 'parseinline' ), $limit ) );
1162         }
1163
1164         /**
1165          * Produce a bar of links which allow the user to select another language
1166          * during login/registration but retain "returnto"
1167          *
1168          * @return string
1169          */
1170         function makeLanguageSelector() {
1171                 global $wgLang;
1172
1173                 $msg = wfMsgForContent( 'loginlanguagelinks' );
1174                 if( $msg != '' && !wfEmptyMsg( 'loginlanguagelinks', $msg ) ) {
1175                         $langs = explode( "\n", $msg );
1176                         $links = array();
1177                         foreach( $langs as $lang ) {
1178                                 $lang = trim( $lang, '* ' );
1179                                 $parts = explode( '|', $lang );
1180                                 if (count($parts) >= 2) {
1181                                         $links[] = $this->makeLanguageSelectorLink( $parts[0], $parts[1] );
1182                                 }
1183                         }
1184                         return count( $links ) > 0 ? wfMsgHtml( 'loginlanguagelabel', $wgLang->pipeList( $links ) ) : '';
1185                 } else {
1186                         return '';
1187                 }
1188         }
1189
1190         /**
1191          * Create a language selector link for a particular language
1192          * Links back to this page preserving type and returnto
1193          *
1194          * @param $text Link text
1195          * @param $lang Language code
1196          */
1197         function makeLanguageSelectorLink( $text, $lang ) {
1198                 global $wgUser;
1199                 $self = SpecialPage::getTitleFor( 'Userlogin' );
1200                 $attr = array( 'uselang' => $lang );
1201                 if( $this->mType == 'signup' )
1202                         $attr['type'] = 'signup';
1203                 if( $this->mReturnTo )
1204                         $attr['returnto'] = $this->mReturnTo;
1205                 $skin = $wgUser->getSkin();
1206                 return $skin->linkKnown(
1207                         $self,
1208                         htmlspecialchars( $text ),
1209                         array(),
1210                         $attr
1211                 );
1212         }
1213 }