includes/specials/SpecialUserlogin.php

   1 <?php
   2 /**
   3  * Implements Special:UserLogin
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  * http://www.gnu.org/copyleft/gpl.html
  19  *
  20  * @file
  21  * @ingroup SpecialPage
  22  */
  23
  24 /**
  25  * Implements Special:UserLogin
  26  *
  27  * @ingroup SpecialPage
  28  */
  29 class LoginForm extends SpecialPage {
  30
  31         const SUCCESS = 0;
  32         const NO_NAME = 1;
  33         const ILLEGAL = 2;
  34         const WRONG_PLUGIN_PASS = 3;
  35         const NOT_EXISTS = 4;
  36         const WRONG_PASS = 5;
  37         const EMPTY_PASS = 6;
  38         const RESET_PASS = 7;
  39         const ABORTED = 8;
  40         const CREATE_BLOCKED = 9;
  41         const THROTTLED = 10;
  42         const USER_BLOCKED = 11;
  43         const NEED_TOKEN = 12;
  44         const WRONG_TOKEN = 13;
  45
  46         var $mUsername, $mPassword, $mRetype, $mReturnTo, $mCookieCheck, $mPosted;
  47         var $mAction, $mCreateaccount, $mCreateaccountMail;
  48         var $mLoginattempt, $mRemember, $mEmail, $mDomain, $mLanguage;
  49         var $mSkipCookieCheck, $mReturnToQuery, $mToken, $mStickHTTPS;
  50         var $mType, $mReason, $mRealName;
  51         var $mAbortLoginErrorMsg = 'login-abort-generic';
  52
  53         /**
  54          * @var ExternalUser
  55          */
  56         private $mExtUser = null;
  57
  58         /**
  59          * @param WebRequest $request
  60          */
  61         public function __construct( $request = null ) {
  62                 parent::__construct( 'Userlogin' );
  63
  64                 if ( $request === null ) {
  65                         global $wgRequest;
  66                         $this->load( $wgRequest );
  67                 } else {
  68                         $this->load( $request );
  69                 }
  70         }
  71
  72         /**
  73          * Loader
  74          *
  75          * @param $request WebRequest object
  76          */
  77         function load( $request ) {
  78                 global $wgAuth, $wgHiddenPrefs, $wgEnableEmail, $wgRedirectOnLogin;
  79
  80                 $this->mType = $request->getText( 'type' );
  81                 $this->mUsername = $request->getText( 'wpName' );
  82                 $this->mPassword = $request->getText( 'wpPassword' );
  83                 $this->mRetype = $request->getText( 'wpRetype' );
  84                 $this->mDomain = $request->getText( 'wpDomain' );
  85                 $this->mReason = $request->getText( 'wpReason' );
  86                 $this->mReturnTo = $request->getVal( 'returnto' );
  87                 $this->mReturnToQuery = $request->getVal( 'returntoquery' );
  88                 $this->mCookieCheck = $request->getVal( 'wpCookieCheck' );
  89                 $this->mPosted = $request->wasPosted();
  90                 $this->mCreateaccount = $request->getCheck( 'wpCreateaccount' );
  91                 $this->mCreateaccountMail = $request->getCheck( 'wpCreateaccountMail' )
  92                                                                         && $wgEnableEmail;
  93                 $this->mLoginattempt = $request->getCheck( 'wpLoginattempt' );
  94                 $this->mAction = $request->getVal( 'action' );
  95                 $this->mRemember = $request->getCheck( 'wpRemember' );
  96                 $this->mStickHTTPS = $request->getCheck( 'wpStickHTTPS' );
  97                 $this->mLanguage = $request->getText( 'uselang' );
  98                 $this->mSkipCookieCheck = $request->getCheck( 'wpSkipCookieCheck' );
  99                 $this->mToken = ( $this->mType == 'signup' ) ? $request->getVal( 'wpCreateaccountToken' ) : $request->getVal( 'wpLoginToken' );
 100
 101                 if ( $wgRedirectOnLogin ) {
 102                         $this->mReturnTo = $wgRedirectOnLogin;
 103                         $this->mReturnToQuery = '';
 104                 }
 105
 106                 if( $wgEnableEmail ) {
 107                         $this->mEmail = $request->getText( 'wpEmail' );
 108                 } else {
 109                         $this->mEmail = '';
 110                 }
 111                 if( !in_array( 'realname', $wgHiddenPrefs ) ) {
 112                         $this->mRealName = $request->getText( 'wpRealName' );
 113                 } else {
 114                         $this->mRealName = '';
 115                 }
 116
 117                 if( !$wgAuth->validDomain( $this->mDomain ) ) {
 118                         $this->mDomain = 'invaliddomain';
 119                 }
 120                 $wgAuth->setDomain( $this->mDomain );
 121
 122                 # When switching accounts, it sucks to get automatically logged out
 123                 $returnToTitle = Title::newFromText( $this->mReturnTo );
 124                 if( is_object( $returnToTitle ) && $returnToTitle->isSpecial( 'Userlogout' ) ) {
 125                         $this->mReturnTo = '';
 126                         $this->mReturnToQuery = '';
 127                 }
 128         }
 129
 130         public function execute( $par ) {
 131                 if ( session_id() == '' ) {
 132                         wfSetupSession();
 133                 }
 134
 135                 if ( $par == 'signup' ) { # Check for [[Special:Userlogin/signup]]
 136                         $this->mType = 'signup';
 137                 }
 138
 139                 if ( !is_null( $this->mCookieCheck ) ) {
 140                         $this->onCookieRedirectCheck( $this->mCookieCheck );
 141                         return;
 142                 } elseif( $this->mPosted ) {
 143                         if( $this->mCreateaccount ) {
 144                                 return $this->addNewAccount();
 145                         } elseif ( $this->mCreateaccountMail ) {
 146                                 return $this->addNewAccountMailPassword();
 147                         } elseif ( ( 'submitlogin' == $this->mAction ) || $this->mLoginattempt ) {
 148                                 return $this->processLogin();
 149                         }
 150                 }
 151                 $this->mainLoginForm( '' );
 152         }
 153
 154         /**
 155          * @private
 156          */
 157         function addNewAccountMailPassword() {
 158                 global $wgOut;
 159
 160                 if ( $this->mEmail == '' ) {
 161                         $this->mainLoginForm( wfMsgExt( 'noemailcreate', array( 'parsemag', 'escape' ) ) );
 162                         return;
 163                 }
 164
 165                 $u = $this->addNewaccountInternal();
 166
 167                 if ( $u == null ) {
 168                         return;
 169                 }
 170
 171                 // Wipe the initial password and mail a temporary one
 172                 $u->setPassword( null );
 173                 $u->saveSettings();
 174                 $result = $this->mailPasswordInternal( $u, false, 'createaccount-title', 'createaccount-text' );
 175
 176                 wfRunHooks( 'AddNewAccount', array( $u, true ) );
 177                 $u->addNewUserLogEntry( true, $this->mReason );
 178
 179                 $wgOut->setPageTitle( wfMsg( 'accmailtitle' ) );
 180
 181                 if( !$result->isGood() ) {
 182                         $this->mainLoginForm( wfMsg( 'mailerror', $result->getWikiText() ) );
 183                 } else {
 184                         $wgOut->addWikiMsg( 'accmailtext', $u->getName(), $u->getEmail() );
 185                         $wgOut->returnToMain( false );
 186                 }
 187         }
 188
 189         /**
 190          * @private
 191          */
 192         function addNewAccount() {
 193                 global $wgUser, $wgEmailAuthentication, $wgOut;
 194
 195                 # Create the account and abort if there's a problem doing so
 196                 $u = $this->addNewAccountInternal();
 197                 if( $u == null ) {
 198                         return;
 199                 }
 200
 201                 # If we showed up language selection links, and one was in use, be
 202                 # smart (and sensible) and save that language as the user's preference
 203                 global $wgLoginLanguageSelector;
 204                 if( $wgLoginLanguageSelector && $this->mLanguage ) {
 205                         $u->setOption( 'language', $this->mLanguage );
 206                 }
 207
 208                 # Send out an email authentication message if needed
 209                 if( $wgEmailAuthentication && Sanitizer::validateEmail( $u->getEmail() ) ) {
 210                         $status = $u->sendConfirmationMail();
 211                         if( $status->isGood() ) {
 212                                 $wgOut->addWikiMsg( 'confirmemail_oncreate' );
 213                         } else {
 214                                 $wgOut->addWikiText( $status->getWikiText( 'confirmemail_sendfailed' ) );
 215                         }
 216                 }
 217
 218                 # Save settings (including confirmation token)
 219                 $u->saveSettings();
 220
 221                 # If not logged in, assume the new account as the current one and set
 222                 # session cookies then show a "welcome" message or a "need cookies"
 223                 # message as needed
 224                 if( $wgUser->isAnon() ) {
 225                         $wgUser = $u;
 226                         $wgUser->setCookies();
 227                         // This should set it for OutputPage and the Skin
 228                         // which is needed or the personal links will be
 229                         // wrong.
 230                         RequestContext::getMain()->setUser( $u );
 231                         wfRunHooks( 'AddNewAccount', array( $wgUser, false ) );
 232                         $wgUser->addNewUserLogEntry();
 233                         if( $this->hasSessionCookie() ) {
 234                                 return $this->successfulCreation();
 235                         } else {
 236                                 return $this->cookieRedirectCheck( 'new' );
 237                         }
 238                 } else {
 239                         # Confirm that the account was created
 240                         $self = SpecialPage::getTitleFor( 'Userlogin' );
 241                         $wgOut->setPageTitle( wfMsgHtml( 'accountcreated' ) );
 242                         $wgOut->addWikiMsg( 'accountcreatedtext', $u->getName() );
 243                         $wgOut->returnToMain( false, $self );
 244                         wfRunHooks( 'AddNewAccount', array( $u, false ) );
 245                         $u->addNewUserLogEntry( false, $this->mReason );
 246                         return true;
 247                 }
 248         }
 249
 250         /**
 251          * @private
 252          */
 253         function addNewAccountInternal() {
 254                 global $wgUser, $wgOut;
 255                 global $wgMemc, $wgAccountCreationThrottle;
 256                 global $wgAuth, $wgMinimalPasswordLength;
 257                 global $wgEmailConfirmToEdit;
 258
 259                 // If the user passes an invalid domain, something is fishy
 260                 if( !$wgAuth->validDomain( $this->mDomain ) ) {
 261                         $this->mainLoginForm( wfMsg( 'wrongpassword' ) );
 262                         return false;
 263                 }
 264
 265                 // If we are not allowing users to login locally, we should be checking
 266                 // to see if the user is actually able to authenticate to the authenti-
 267                 // cation server before they create an account (otherwise, they can
 268                 // create a local account and login as any domain user). We only need
 269                 // to check this for domains that aren't local.
 270                 if( 'local' != $this->mDomain && $this->mDomain != '' ) {
 271                         if( !$wgAuth->canCreateAccounts() && ( !$wgAuth->userExists( $this->mUsername )
 272                                 || !$wgAuth->authenticate( $this->mUsername, $this->mPassword ) ) ) {
 273                                 $this->mainLoginForm( wfMsg( 'wrongpassword' ) );
 274                                 return false;
 275                         }
 276                 }
 277
 278                 if ( wfReadOnly() ) {
 279                         $wgOut->readOnlyPage();
 280                         return false;
 281                 }
 282
 283                 # Request forgery checks.
 284                 if ( !self::getCreateaccountToken() ) {
 285                         self::setCreateaccountToken();
 286                         $this->mainLoginForm( wfMsgExt( 'nocookiesfornew', array( 'parseinline' ) ) );
 287                         return false;
 288                 }
 289
 290                 # The user didn't pass a createaccount token
 291                 if ( !$this->mToken ) {
 292                         $this->mainLoginForm( wfMsg( 'sessionfailure' ) );
 293                         return false;
 294                 }
 295
 296                 # Validate the createaccount token
 297                 if ( $this->mToken !== self::getCreateaccountToken() ) {
 298                         $this->mainLoginForm( wfMsg( 'sessionfailure' ) );
 299                         return false;
 300                 }
 301
 302                 # Check permissions
 303                 if ( !$wgUser->isAllowed( 'createaccount' ) ) {
 304                         $wgOut->permissionRequired( 'createaccount' );
 305                         return false;
 306                 } elseif ( $wgUser->isBlockedFromCreateAccount() ) {
 307                         $this->userBlockedMessage( $wgUser->isBlockedFromCreateAccount() );
 308                         return false;
 309                 }
 310
 311                 $ip = wfGetIP();
 312                 if ( $wgUser->isDnsBlacklisted( $ip, true /* check $wgProxyWhitelist */ ) ) {
 313                         $this->mainLoginForm( wfMsg( 'sorbs_create_account_reason' ) . ' (' . htmlspecialchars( $ip ) . ')' );
 314                         return false;
 315                 }
 316
 317                 # Now create a dummy user ($u) and check if it is valid
 318                 $name = trim( $this->mUsername );
 319                 $u = User::newFromName( $name, 'creatable' );
 320                 if ( !is_object( $u ) ) {
 321                         $this->mainLoginForm( wfMsg( 'noname' ) );
 322                         return false;
 323                 }
 324
 325                 if ( 0 != $u->idForName() ) {
 326                         $this->mainLoginForm( wfMsg( 'userexists' ) );
 327                         return false;
 328                 }
 329
 330                 if ( 0 != strcmp( $this->mPassword, $this->mRetype ) ) {
 331                         $this->mainLoginForm( wfMsg( 'badretype' ) );
 332                         return false;
 333                 }
 334
 335                 # check for minimal password length
 336                 $valid = $u->getPasswordValidity( $this->mPassword );
 337                 if ( $valid !== true ) {
 338                         if ( !$this->mCreateaccountMail ) {
 339                                 if ( is_array( $valid ) ) {
 340                                         $message = array_shift( $valid );
 341                                         $params = $valid;
 342                                 } else {
 343                                         $message = $valid;
 344                                         $params = array( $wgMinimalPasswordLength );
 345                                 }
 346                                 $this->mainLoginForm( wfMsgExt( $message, array( 'parsemag' ), $params ) );
 347                                 return false;
 348                         } else {
 349                                 # do not force a password for account creation by email
 350                                 # set invalid password, it will be replaced later by a random generated password
 351                                 $this->mPassword = null;
 352                         }
 353                 }
 354
 355                 # if you need a confirmed email address to edit, then obviously you
 356                 # need an email address.
 357                 if ( $wgEmailConfirmToEdit && empty( $this->mEmail ) ) {
 358                         $this->mainLoginForm( wfMsg( 'noemailtitle' ) );
 359                         return false;
 360                 }
 361
 362                 if( !empty( $this->mEmail ) && !Sanitizer::validateEmail( $this->mEmail ) ) {
 363                         $this->mainLoginForm( wfMsg( 'invalidemailaddress' ) );
 364                         return false;
 365                 }
 366
 367                 # Set some additional data so the AbortNewAccount hook can be used for
 368                 # more than just username validation
 369                 $u->setEmail( $this->mEmail );
 370                 $u->setRealName( $this->mRealName );
 371
 372                 $abortError = '';
 373                 if( !wfRunHooks( 'AbortNewAccount', array( $u, &$abortError ) ) ) {
 374                         // Hook point to add extra creation throttles and blocks
 375                         wfDebug( "LoginForm::addNewAccountInternal: a hook blocked creation\n" );
 376                         $this->mainLoginForm( $abortError );
 377                         return false;
 378                 }
 379
 380                 if ( $wgAccountCreationThrottle && $wgUser->isPingLimitable() ) {
 381                         $key = wfMemcKey( 'acctcreate', 'ip', $ip );
 382                         $value = $wgMemc->get( $key );
 383                         if ( !$value ) {
 384                                 $wgMemc->set( $key, 0, 86400 );
 385                         }
 386                         if ( $value >= $wgAccountCreationThrottle ) {
 387                                 $this->throttleHit( $wgAccountCreationThrottle );
 388                                 return false;
 389                         }
 390                         $wgMemc->incr( $key );
 391                 }
 392
 393                 if( !$wgAuth->addUser( $u, $this->mPassword, $this->mEmail, $this->mRealName ) ) {
 394                         $this->mainLoginForm( wfMsg( 'externaldberror' ) );
 395                         return false;
 396                 }
 397
 398                 self::clearCreateaccountToken();
 399                 return $this->initUser( $u, false );
 400         }
 401
 402         /**
 403          * Actually add a user to the database.
 404          * Give it a User object that has been initialised with a name.
 405          *
 406          * @param $u User object.
 407          * @param $autocreate boolean -- true if this is an autocreation via auth plugin
 408          * @return User object.
 409          * @private
 410          */
 411         function initUser( $u, $autocreate ) {
 412                 global $wgAuth;
 413
 414                 $u->addToDatabase();
 415
 416                 if ( $wgAuth->allowPasswordChange() ) {
 417                         $u->setPassword( $this->mPassword );
 418                 }
 419
 420                 $u->setEmail( $this->mEmail );
 421                 $u->setRealName( $this->mRealName );
 422                 $u->setToken();
 423
 424                 $wgAuth->initUser( $u, $autocreate );
 425
 426                 if ( $this->mExtUser ) {
 427                         $this->mExtUser->linkToLocal( $u->getId() );
 428                         $email = $this->mExtUser->getPref( 'emailaddress' );
 429                         if ( $email && !$this->mEmail ) {
 430                                 $u->setEmail( $email );
 431                         }
 432                 }
 433
 434                 $u->setOption( 'rememberpassword', $this->mRemember ? 1 : 0 );
 435                 $u->saveSettings();
 436
 437                 # Update user count
 438                 $ssUpdate = new SiteStatsUpdate( 0, 0, 0, 0, 1 );
 439                 $ssUpdate->doUpdate();
 440
 441                 return $u;
 442         }
 443
 444         /**
 445          * Internally authenticate the login request.
 446          *
 447          * This may create a local account as a side effect if the
 448          * authentication plugin allows transparent local account
 449          * creation.
 450          */
 451         public function authenticateUserData() {
 452                 global $wgUser, $wgAuth;
 453
 454                 if ( $this->mUsername == '' ) {
 455                         return self::NO_NAME;
 456                 }
 457
 458                 // We require a login token to prevent login CSRF
 459                 // Handle part of this before incrementing the throttle so
 460                 // token-less login attempts don't count towards the throttle
 461                 // but wrong-token attempts do.
 462
 463                 // If the user doesn't have a login token yet, set one.
 464                 if ( !self::getLoginToken() ) {
 465                         self::setLoginToken();
 466                         return self::NEED_TOKEN;
 467                 }
 468                 // If the user didn't pass a login token, tell them we need one
 469                 if ( !$this->mToken ) {
 470                         return self::NEED_TOKEN;
 471                 }
 472
 473                 $throttleCount = self::incLoginThrottle( $this->mUsername );
 474                 if ( $throttleCount === true ) {
 475                         return self::THROTTLED;
 476                 }
 477
 478                 // Validate the login token
 479                 if ( $this->mToken !== self::getLoginToken() ) {
 480                         return self::WRONG_TOKEN;
 481                 }
 482
 483                 // Load $wgUser now, and check to see if we're logging in as the same
 484                 // name. This is necessary because loading $wgUser (say by calling
 485                 // getName()) calls the UserLoadFromSession hook, which potentially
 486                 // creates the user in the database. Until we load $wgUser, checking
 487                 // for user existence using User::newFromName($name)->getId() below
 488                 // will effectively be using stale data.
 489                 if ( $wgUser->getName() === $this->mUsername ) {
 490                         wfDebug( __METHOD__ . ": already logged in as {$this->mUsername}\n" );
 491                         return self::SUCCESS;
 492                 }
 493
 494                 $this->mExtUser = ExternalUser::newFromName( $this->mUsername );
 495
 496                 # TODO: Allow some magic here for invalid external names, e.g., let the
 497                 # user choose a different wiki name.
 498                 $u = User::newFromName( $this->mUsername );
 499                 if( !( $u instanceof User ) || !User::isUsableName( $u->getName() ) ) {
 500                         return self::ILLEGAL;
 501                 }
 502
 503                 $isAutoCreated = false;
 504                 if ( 0 == $u->getID() ) {
 505                         $status = $this->attemptAutoCreate( $u );
 506                         if ( $status !== self::SUCCESS ) {
 507                                 return $status;
 508                         } else {
 509                                 $isAutoCreated = true;
 510                         }
 511                 } else {
 512                         global $wgExternalAuthType, $wgAutocreatePolicy;
 513                         if ( $wgExternalAuthType && $wgAutocreatePolicy != 'never'
 514                         && is_object( $this->mExtUser )
 515                         && $this->mExtUser->authenticate( $this->mPassword ) ) {
 516                                 # The external user and local user have the same name and
 517                                 # password, so we assume they're the same.
 518                                 $this->mExtUser->linkToLocal( $u->getID() );
 519                         }
 520
 521                         $u->load();
 522                 }
 523
 524                 // Give general extensions, such as a captcha, a chance to abort logins
 525                 $abort = self::ABORTED;
 526                 if( !wfRunHooks( 'AbortLogin', array( $u, $this->mPassword, &$abort, &$this->mAbortLoginErrorMsg ) ) ) {
 527                         return $abort;
 528                 }
 529
 530                 global $wgBlockDisablesLogin;
 531                 if ( !$u->checkPassword( $this->mPassword ) ) {
 532                         if( $u->checkTemporaryPassword( $this->mPassword ) ) {
 533                                 // The e-mailed temporary password should not be used for actu-
 534                                 // al logins; that's a very sloppy habit, and insecure if an
 535                                 // attacker has a few seconds to click "search" on someone's o-
 536                                 // pen mail reader.
 537                                 //
 538                                 // Allow it to be used only to reset the password a single time
 539                                 // to a new value, which won't be in the user's e-mail ar-
 540                                 // chives.
 541                                 //
 542                                 // For backwards compatibility, we'll still recognize it at the
 543                                 // login form to minimize surprises for people who have been
 544                                 // logging in with a temporary password for some time.
 545                                 //
 546                                 // As a side-effect, we can authenticate the user's e-mail ad-
 547                                 // dress if it's not already done, since the temporary password
 548                                 // was sent via e-mail.
 549                                 if( !$u->isEmailConfirmed() ) {
 550                                         $u->confirmEmail();
 551                                         $u->saveSettings();
 552                                 }
 553
 554                                 // At this point we just return an appropriate code/ indicating
 555                                 // that the UI should show a password reset form; bot inter-
 556                                 // faces etc will probably just fail cleanly here.
 557                                 $retval = self::RESET_PASS;
 558                         } else {
 559                                 $retval = ( $this->mPassword  == '' ) ? self::EMPTY_PASS : self::WRONG_PASS;
 560                         }
 561                 } elseif ( $wgBlockDisablesLogin && $u->isBlocked() ) {
 562                         // If we've enabled it, make it so that a blocked user cannot login
 563                         $retval = self::USER_BLOCKED;
 564                 } else {
 565                         $wgAuth->updateUser( $u );
 566                         $wgUser = $u;
 567
 568                         // Please reset throttle for successful logins, thanks!
 569                         if ( $throttleCount ) {
 570                                 self::clearLoginThrottle( $this->mUsername );
 571                         }
 572
 573                         if ( $isAutoCreated ) {
 574                                 // Must be run after $wgUser is set, for correct new user log
 575                                 wfRunHooks( 'AuthPluginAutoCreate', array( $wgUser ) );
 576                         }
 577
 578                         $retval = self::SUCCESS;
 579                 }
 580                 wfRunHooks( 'LoginAuthenticateAudit', array( $u, $this->mPassword, $retval ) );
 581                 return $retval;
 582         }
 583
 584         /*
 585          * Increment the login attempt throttle hit count for the (username,current IP)
 586          * tuple unless the throttle was already reached.
 587          * @param $username string The user name
 588          * @return Bool|Integer The integer hit count or True if it is already at the limit
 589          */
 590         public static function incLoginThrottle( $username ) {
 591                 global $wgPasswordAttemptThrottle, $wgMemc;
 592                 $username = trim( $username ); // sanity
 593
 594                 $throttleCount = 0;
 595                 if ( is_array( $wgPasswordAttemptThrottle ) ) {
 596                         $throttleKey = wfMemcKey( 'password-throttle', wfGetIP(), md5( $username ) );
 597                         $count = $wgPasswordAttemptThrottle['count'];
 598                         $period = $wgPasswordAttemptThrottle['seconds'];
 599
 600                         $throttleCount = $wgMemc->get( $throttleKey );
 601                         if ( !$throttleCount ) {
 602                                 $wgMemc->add( $throttleKey, 1, $period ); // start counter
 603                         } elseif ( $throttleCount < $count ) {
 604                                 $wgMemc->incr( $throttleKey );
 605                         } elseif ( $throttleCount >= $count ) {
 606                                 return true;
 607                         }
 608                 }
 609
 610                 return $throttleCount;
 611         }
 612
 613         /*
 614          * Clear the login attempt throttle hit count for the (username,current IP) tuple.
 615          * @param $username string The user name
 616          * @return void
 617          */
 618         public static function clearLoginThrottle( $username ) {
 619                 global $wgMemc;
 620                 $username = trim( $username ); // sanity
 621
 622                 $throttleKey = wfMemcKey( 'password-throttle', wfGetIP(), md5( $username ) );
 623                 $wgMemc->delete( $throttleKey );
 624         }
 625
 626         /**
 627          * Attempt to automatically create a user on login. Only succeeds if there
 628          * is an external authentication method which allows it.
 629          *
 630          * @param $user User
 631          *
 632          * @return integer Status code
 633          */
 634         function attemptAutoCreate( $user ) {
 635                 global $wgAuth, $wgUser, $wgAutocreatePolicy;
 636
 637                 if ( $wgUser->isBlockedFromCreateAccount() ) {
 638                         wfDebug( __METHOD__ . ": user is blocked from account creation\n" );
 639                         return self::CREATE_BLOCKED;
 640                 }
 641
 642                 /**
 643                  * If the external authentication plugin allows it, automatically cre-
 644                  * ate a new account for users that are externally defined but have not
 645                  * yet logged in.
 646                  */
 647                 if ( $this->mExtUser ) {
 648                         # mExtUser is neither null nor false, so use the new ExternalAuth
 649                         # system.
 650                         if ( $wgAutocreatePolicy == 'never' ) {
 651                                 return self::NOT_EXISTS;
 652                         }
 653                         if ( !$this->mExtUser->authenticate( $this->mPassword ) ) {
 654                                 return self::WRONG_PLUGIN_PASS;
 655                         }
 656                 } else {
 657                         # Old AuthPlugin.
 658                         if ( !$wgAuth->autoCreate() ) {
 659                                 return self::NOT_EXISTS;
 660                         }
 661                         if ( !$wgAuth->userExists( $user->getName() ) ) {
 662                                 wfDebug( __METHOD__ . ": user does not exist\n" );
 663                                 return self::NOT_EXISTS;
 664                         }
 665                         if ( !$wgAuth->authenticate( $user->getName(), $this->mPassword ) ) {
 666                                 wfDebug( __METHOD__ . ": \$wgAuth->authenticate() returned false, aborting\n" );
 667                                 return self::WRONG_PLUGIN_PASS;
 668                         }
 669                 }
 670
 671                 $abortError = '';
 672                 if( !wfRunHooks( 'AbortAutoAccount', array( $user, &$abortError ) ) ) {
 673                         // Hook point to add extra creation throttles and blocks
 674                         wfDebug( "LoginForm::attemptAutoCreate: a hook blocked creation: $abortError\n" );
 675                         $this->mAbortLoginErrorMsg = $abortError;
 676                         return self::ABORTED;
 677                 }
 678
 679                 wfDebug( __METHOD__ . ": creating account\n" );
 680                 $this->initUser( $user, true );
 681                 return self::SUCCESS;
 682         }
 683
 684         function processLogin() {
 685                 global $wgUser;
 686
 687                 switch ( $this->authenticateUserData() ) {
 688                         case self::SUCCESS:
 689                                 # We've verified now, update the real record
 690                                 if( (bool)$this->mRemember != (bool)$wgUser->getOption( 'rememberpassword' ) ) {
 691                                         $wgUser->setOption( 'rememberpassword', $this->mRemember ? 1 : 0 );
 692                                         $wgUser->saveSettings();
 693                                 } else {
 694                                         $wgUser->invalidateCache();
 695                                 }
 696                                 $wgUser->setCookies();
 697                                 self::clearLoginToken();
 698
 699                                 // Reset the throttle
 700                                 $key = wfMemcKey( 'password-throttle', wfGetIP(), md5( $this->mUsername ) );
 701                                 global $wgMemc;
 702                                 $wgMemc->delete( $key );
 703
 704                                 if( $this->hasSessionCookie() || $this->mSkipCookieCheck ) {
 705                                         /* Replace the language object to provide user interface in
 706                                          * correct language immediately on this first page load.
 707                                          */
 708                                         global $wgLang, $wgRequest;
 709                                         $code = $wgRequest->getVal( 'uselang', $wgUser->getOption( 'language' ) );
 710                                         $wgLang = Language::factory( $code );
 711                                         return $this->successfulLogin();
 712                                 } else {
 713                                         return $this->cookieRedirectCheck( 'login' );
 714                                 }
 715                                 break;
 716
 717                         case self::NEED_TOKEN:
 718                                 $this->mainLoginForm( wfMsgExt( 'nocookiesforlogin', array( 'parseinline' ) ) );
 719                                 break;
 720                         case self::WRONG_TOKEN:
 721                                 $this->mainLoginForm( wfMsg( 'sessionfailure' ) );
 722                                 break;
 723                         case self::NO_NAME:
 724                         case self::ILLEGAL:
 725                                 $this->mainLoginForm( wfMsg( 'noname' ) );
 726                                 break;
 727                         case self::WRONG_PLUGIN_PASS:
 728                                 $this->mainLoginForm( wfMsg( 'wrongpassword' ) );
 729                                 break;
 730                         case self::NOT_EXISTS:
 731                                 if( $wgUser->isAllowed( 'createaccount' ) ) {
 732                                         $this->mainLoginForm( wfMsgExt( 'nosuchuser', 'parseinline',
 733                                            wfEscapeWikiText( $this->mUsername ) ) );
 734                                 } else {
 735                                         $this->mainLoginForm( wfMsg( 'nosuchusershort',
 736                                                 wfEscapeWikiText( $this->mUsername ) ) );
 737                                 }
 738                                 break;
 739                         case self::WRONG_PASS:
 740                                 $this->mainLoginForm( wfMsg( 'wrongpassword' ) );
 741                                 break;
 742                         case self::EMPTY_PASS:
 743                                 $this->mainLoginForm( wfMsg( 'wrongpasswordempty' ) );
 744                                 break;
 745                         case self::RESET_PASS:
 746                                 $this->resetLoginForm( wfMsg( 'resetpass_announce' ) );
 747                                 break;
 748                         case self::CREATE_BLOCKED:
 749                                 $this->userBlockedMessage( $wgUser->mBlock );
 750                                 break;
 751                         case self::THROTTLED:
 752                                 $this->mainLoginForm( wfMsg( 'login-throttled' ) );
 753                                 break;
 754                         case self::USER_BLOCKED:
 755                                 $this->mainLoginForm( wfMsgExt( 'login-userblocked',
 756                                         array( 'parsemag', 'escape' ), $this->mUsername ) );
 757                                 break;
 758                         case self::ABORTED:
 759                                 $this->mainLoginForm( wfMsg( $this->mAbortLoginErrorMsg  ) );
 760                                 break;
 761                         default:
 762                                 throw new MWException( 'Unhandled case value' );
 763                 }
 764         }
 765
 766         function resetLoginForm( $error ) {
 767                 global $wgOut;
 768                 $wgOut->addHTML( Xml::element('p', array( 'class' => 'error' ), $error ) );
 769                 $reset = new SpecialChangePassword();
 770                 $reset->execute( null );
 771         }
 772
 773         /**
 774          * @param $u User object
 775          * @param $throttle Boolean
 776          * @param $emailTitle String: message name of email title
 777          * @param $emailText String: message name of email text
 778          * @return Status object
 779          * @private
 780          */
 781         function mailPasswordInternal( $u, $throttle = true, $emailTitle = 'passwordremindertitle', $emailText = 'passwordremindertext' ) {
 782                 global $wgServer, $wgScript, $wgUser, $wgNewPasswordExpiry;
 783
 784                 if ( $u->getEmail() == '' ) {
 785                         return Status::newFatal( 'noemail', $u->getName() );
 786                 }
 787                 $ip = wfGetIP();
 788                 if( !$ip ) {
 789                         return Status::newFatal( 'badipaddress' );
 790                 }
 791
 792                 wfRunHooks( 'User::mailPasswordInternal', array( &$wgUser, &$ip, &$u ) );
 793
 794                 $np = $u->randomPassword();
 795                 $u->setNewpassword( $np, $throttle );
 796                 $u->saveSettings();
 797                 $userLanguage = $u->getOption( 'language' );
 798                 $m = wfMsgExt( $emailText, array( 'parsemag', 'language' => $userLanguage ), $ip, $u->getName(), $np,
 799                                 $wgServer . $wgScript, round( $wgNewPasswordExpiry / 86400 ) );
 800                 $result = $u->sendMail( wfMsgExt( $emailTitle, array( 'parsemag', 'language' => $userLanguage ) ), $m );
 801
 802                 return $result;
 803         }
 804
 805
 806         /**
 807          * Run any hooks registered for logins, then HTTP redirect to
 808          * $this->mReturnTo (or Main Page if that's undefined).  Formerly we had a
 809          * nice message here, but that's really not as useful as just being sent to
 810          * wherever you logged in from.  It should be clear that the action was
 811          * successful, given the lack of error messages plus the appearance of your
 812          * name in the upper right.
 813          *
 814          * @private
 815          */
 816         function successfulLogin() {
 817                 global $wgUser, $wgOut;
 818
 819                 # Run any hooks; display injected HTML if any, else redirect
 820                 $injected_html = '';
 821                 wfRunHooks( 'UserLoginComplete', array( &$wgUser, &$injected_html ) );
 822
 823                 if( $injected_html !== '' ) {
 824                         $this->displaySuccessfulLogin( 'loginsuccess', $injected_html );
 825                 } else {
 826                         $titleObj = Title::newFromText( $this->mReturnTo );
 827                         if ( !$titleObj instanceof Title ) {
 828                                 $titleObj = Title::newMainPage();
 829                         }
 830                         $redirectUrl = $titleObj->getFullURL( $this->mReturnToQuery );
 831                         global $wgSecureLogin;
 832                         if( $wgSecureLogin && !$this->mStickHTTPS ) {
 833                                 $redirectUrl = preg_replace( '/^https:/', 'http:', $redirectUrl );
 834                         }
 835                         $wgOut->redirect( $redirectUrl );
 836                 }
 837         }
 838
 839         /**
 840          * Run any hooks registered for logins, then display a message welcoming
 841          * the user.
 842          *
 843          * @private
 844          */
 845         function successfulCreation() {
 846                 global $wgUser;
 847                 # Run any hooks; display injected HTML
 848                 $injected_html = '';
 849                 $welcome_creation_msg = 'welcomecreation';
 850
 851                 wfRunHooks( 'UserLoginComplete', array( &$wgUser, &$injected_html ) );
 852
 853                 //let any extensions change what message is shown
 854                 wfRunHooks( 'BeforeWelcomeCreation', array( &$welcome_creation_msg, &$injected_html ) );
 855
 856                 $this->displaySuccessfulLogin( $welcome_creation_msg, $injected_html );
 857         }
 858
 859         /**
 860          * Display a "login successful" page.
 861          */
 862         private function displaySuccessfulLogin( $msgname, $injected_html ) {
 863                 global $wgOut, $wgUser;
 864
 865                 $wgOut->setPageTitle( wfMsg( 'loginsuccesstitle' ) );
 866                 if( $msgname ){
 867                         $wgOut->addWikiMsg( $msgname, wfEscapeWikiText( $wgUser->getName() ) );
 868                 }
 869
 870                 $wgOut->addHTML( $injected_html );
 871
 872                 if ( !empty( $this->mReturnTo ) ) {
 873                         $wgOut->returnToMain( null, $this->mReturnTo, $this->mReturnToQuery );
 874                 } else {
 875                         $wgOut->returnToMain( null );
 876                 }
 877         }
 878
 879         /**
 880          * Output a message that informs the user that they cannot create an account because
 881          * there is a block on them or their IP which prevents account creation.  Note that
 882          * User::isBlockedFromCreateAccount(), which gets this block, ignores the 'hardblock'
 883          * setting on blocks (bug 13611).
 884          * @param $block Block the block causing this error
 885          */
 886         function userBlockedMessage( Block $block ) {
 887                 global $wgOut;
 888
 889                 # Let's be nice about this, it's likely that this feature will be used
 890                 # for blocking large numbers of innocent people, e.g. range blocks on
 891                 # schools. Don't blame it on the user. There's a small chance that it
 892                 # really is the user's fault, i.e. the username is blocked and they
 893                 # haven't bothered to log out before trying to create an account to
 894                 # evade it, but we'll leave that to their guilty conscience to figure
 895                 # out.
 896
 897                 $wgOut->setPageTitle( wfMsg( 'cantcreateaccounttitle' ) );
 898
 899                 $block_reason = $block->mReason;
 900                 if ( strval( $block_reason ) === '' ) {
 901                         $block_reason = wfMsg( 'blockednoreason' );
 902                 }
 903
 904                 $wgOut->addWikiMsg(
 905                         'cantcreateaccount-text',
 906                         $block->getTarget(),
 907                         $block_reason,
 908                         $block->getBlocker()->getName()
 909                 );
 910
 911                 $wgOut->returnToMain( false );
 912         }
 913
 914         /**
 915          * @private
 916          */
 917         function mainLoginForm( $msg, $msgtype = 'error' ) {
 918                 global $wgUser, $wgOut, $wgHiddenPrefs;
 919                 global $wgEnableEmail, $wgEnableUserEmail;
 920                 global $wgRequest, $wgLoginLanguageSelector;
 921                 global $wgAuth, $wgEmailConfirmToEdit, $wgCookieExpiration;
 922                 global $wgSecureLogin, $wgPasswordResetRoutes;
 923
 924                 $titleObj = SpecialPage::getTitleFor( 'Userlogin' );
 925
 926                 if ( $this->mType == 'signup' ) {
 927                         // Block signup here if in readonly. Keeps user from
 928                         // going through the process (filling out data, etc)
 929                         // and being informed later.
 930                         if ( wfReadOnly() ) {
 931                                 $wgOut->readOnlyPage();
 932                                 return;
 933                         } elseif ( $wgUser->isBlockedFromCreateAccount() ) {
 934                                 $this->userBlockedMessage( $wgUser->isBlockedFromCreateAccount() );
 935                                 return;
 936                         } elseif ( count( $permErrors = $titleObj->getUserPermissionsErrors( 'createaccount', $wgUser, true ) )>0 ) {
 937                                 $wgOut->showPermissionsErrorPage( $permErrors, 'createaccount' );
 938                                 return;
 939                         }
 940                 }
 941
 942                 if ( $this->mUsername == '' ) {
 943                         if ( $wgUser->isLoggedIn() ) {
 944                                 $this->mUsername = $wgUser->getName();
 945                         } else {
 946                                 $this->mUsername = $wgRequest->getCookie( 'UserName' );
 947                         }
 948                 }
 949
 950                 if ( $this->mType == 'signup' ) {
 951                         $template = new UsercreateTemplate();
 952                         $q = 'action=submitlogin&type=signup';
 953                         $linkq = 'type=login';
 954                         $linkmsg = 'gotaccount';
 955                 } else {
 956                         $template = new UserloginTemplate();
 957                         $q = 'action=submitlogin&type=login';
 958                         $linkq = 'type=signup';
 959                         $linkmsg = 'nologin';
 960                 }
 961
 962                 if ( !empty( $this->mReturnTo ) ) {
 963                         $returnto = '&returnto=' . wfUrlencode( $this->mReturnTo );
 964                         if ( !empty( $this->mReturnToQuery ) ) {
 965                                 $returnto .= '&returntoquery=' .
 966                                         wfUrlencode( $this->mReturnToQuery );
 967                         }
 968                         $q .= $returnto;
 969                         $linkq .= $returnto;
 970                 }
 971
 972                 # Pass any language selection on to the mode switch link
 973                 if( $wgLoginLanguageSelector && $this->mLanguage ) {
 974                         $linkq .= '&uselang=' . $this->mLanguage;
 975                 }
 976
 977                 $link = '<a href="' . htmlspecialchars ( $titleObj->getLocalURL( $linkq ) ) . '">';
 978                 $link .= wfMsgHtml( $linkmsg . 'link' ); # Calling either 'gotaccountlink' or 'nologinlink'
 979                 $link .= '</a>';
 980
 981                 # Don't show a "create account" link if the user can't
 982                 if( $this->showCreateOrLoginLink( $wgUser ) ) {
 983                         $template->set( 'link', wfMsgExt( $linkmsg, array( 'parseinline', 'replaceafter' ), $link ) );
 984                 } else {
 985                         $template->set( 'link', '' );
 986                 }
 987
 988                 $resetLink = $this->mType == 'signup'
 989                         ? null
 990                         : is_array( $wgPasswordResetRoutes ) && in_array( true, array_values( $wgPasswordResetRoutes ) );
 991
 992                 $template->set( 'header', '' );
 993                 $template->set( 'name', $this->mUsername );
 994                 $template->set( 'password', $this->mPassword );
 995                 $template->set( 'retype', $this->mRetype );
 996                 $template->set( 'email', $this->mEmail );
 997                 $template->set( 'realname', $this->mRealName );
 998                 $template->set( 'domain', $this->mDomain );
 999                 $template->set( 'reason', $this->mReason );
1000
1001                 $template->set( 'action', $titleObj->getLocalURL( $q ) );
1002                 $template->set( 'message', $msg );
1003                 $template->set( 'messagetype', $msgtype );
1004                 $template->set( 'createemail', $wgEnableEmail && $wgUser->isLoggedIn() );
1005                 $template->set( 'userealname', !in_array( 'realname', $wgHiddenPrefs ) );
1006                 $template->set( 'useemail', $wgEnableEmail );
1007                 $template->set( 'emailrequired', $wgEmailConfirmToEdit );
1008                 $template->set( 'emailothers', $wgEnableUserEmail );
1009                 $template->set( 'canreset', $wgAuth->allowPasswordChange() );
1010                 $template->set( 'resetlink', $resetLink );
1011                 $template->set( 'canremember', ( $wgCookieExpiration > 0 ) );
1012                 $template->set( 'usereason', $wgUser->isLoggedIn() );
1013                 $template->set( 'remember', $wgUser->getOption( 'rememberpassword' ) || $this->mRemember );
1014                 $template->set( 'cansecurelogin', ( $wgSecureLogin === true ) );
1015                 $template->set( 'stickHTTPS', $this->mStickHTTPS );
1016
1017                 if ( $this->mType == 'signup' ) {
1018                         if ( !self::getCreateaccountToken() ) {
1019                                 self::setCreateaccountToken();
1020                         }
1021                         $template->set( 'token', self::getCreateaccountToken() );
1022                 } else {
1023                         if ( !self::getLoginToken() ) {
1024                                 self::setLoginToken();
1025                         }
1026                         $template->set( 'token', self::getLoginToken() );
1027                 }
1028
1029                 # Prepare language selection links as needed
1030                 if( $wgLoginLanguageSelector ) {
1031                         $template->set( 'languages', $this->makeLanguageSelector() );
1032                         if( $this->mLanguage )
1033                                 $template->set( 'uselang', $this->mLanguage );
1034                 }
1035
1036                 // Give authentication and captcha plugins a chance to modify the form
1037                 $wgAuth->modifyUITemplate( $template, $this->mType );
1038                 if ( $this->mType == 'signup' ) {
1039                         wfRunHooks( 'UserCreateForm', array( &$template ) );
1040                 } else {
1041                         wfRunHooks( 'UserLoginForm', array( &$template ) );
1042                 }
1043
1044                 // Changes the title depending on permissions for creating account
1045                 if ( $wgUser->isAllowed( 'createaccount' ) ) {
1046                         $wgOut->setPageTitle( wfMsg( 'userlogin' ) );
1047                 } else {
1048                         $wgOut->setPageTitle( wfMsg( 'userloginnocreate' ) );
1049                 }
1050
1051                 $wgOut->disallowUserJs(); // just in case...
1052                 $wgOut->addTemplate( $template );
1053         }
1054
1055         /**
1056          * @private
1057          *
1058          * @param $user User
1059          *
1060          * @return Boolean
1061          */
1062         function showCreateOrLoginLink( &$user ) {
1063                 if( $this->mType == 'signup' ) {
1064                         return true;
1065                 } elseif( $user->isAllowed( 'createaccount' ) ) {
1066                         return true;
1067                 } else {
1068                         return false;
1069                 }
1070         }
1071
1072         /**
1073          * Check if a session cookie is present.
1074          *
1075          * This will not pick up a cookie set during _this_ request, but is meant
1076          * to ensure that the client is returning the cookie which was set on a
1077          * previous pass through the system.
1078          *
1079          * @private
1080          */
1081         function hasSessionCookie() {
1082                 global $wgDisableCookieCheck, $wgRequest;
1083                 return $wgDisableCookieCheck ? true : $wgRequest->checkSessionCookie();
1084         }
1085
1086         /**
1087          * Get the login token from the current session
1088          */
1089         public static function getLoginToken() {
1090                 global $wgRequest;
1091                 return $wgRequest->getSessionData( 'wsLoginToken' );
1092         }
1093
1094         /**
1095          * Randomly generate a new login token and attach it to the current session
1096          */
1097         public static function setLoginToken() {
1098                 global $wgRequest;
1099                 // Use User::generateToken() instead of $user->editToken()
1100                 // because the latter reuses $_SESSION['wsEditToken']
1101                 $wgRequest->setSessionData( 'wsLoginToken', User::generateToken() );
1102         }
1103
1104         /**
1105          * Remove any login token attached to the current session
1106          */
1107         public static function clearLoginToken() {
1108                 global $wgRequest;
1109                 $wgRequest->setSessionData( 'wsLoginToken', null );
1110         }
1111
1112         /**
1113          * Get the createaccount token from the current session
1114          */
1115         public static function getCreateaccountToken() {
1116                 global $wgRequest;
1117                 return $wgRequest->getSessionData( 'wsCreateaccountToken' );
1118         }
1119
1120         /**
1121          * Randomly generate a new createaccount token and attach it to the current session
1122          */
1123         public static function setCreateaccountToken() {
1124                 global $wgRequest;
1125                 $wgRequest->setSessionData( 'wsCreateaccountToken', User::generateToken() );
1126         }
1127
1128         /**
1129          * Remove any createaccount token attached to the current session
1130          */
1131         public static function clearCreateaccountToken() {
1132                 global $wgRequest;
1133                 $wgRequest->setSessionData( 'wsCreateaccountToken', null );
1134         }
1135
1136         /**
1137          * @private
1138          */
1139         function cookieRedirectCheck( $type ) {
1140                 global $wgOut;
1141
1142                 $titleObj = SpecialPage::getTitleFor( 'Userlogin' );
1143                 $query = array( 'wpCookieCheck' => $type );
1144                 if ( $this->mReturnTo ) {
1145                         $query['returnto'] = $this->mReturnTo;
1146                 }
1147                 $check = $titleObj->getFullURL( $query );
1148
1149                 return $wgOut->redirect( $check );
1150         }
1151
1152         /**
1153          * @private
1154          */
1155         function onCookieRedirectCheck( $type ) {
1156                 if ( !$this->hasSessionCookie() ) {
1157                         if ( $type == 'new' ) {
1158                                 return $this->mainLoginForm( wfMsgExt( 'nocookiesnew', array( 'parseinline' ) ) );
1159                         } elseif ( $type == 'login' ) {
1160                                 return $this->mainLoginForm( wfMsgExt( 'nocookieslogin', array( 'parseinline' ) ) );
1161                         } else {
1162                                 # shouldn't happen
1163                                 return $this->mainLoginForm( wfMsg( 'error' ) );
1164                         }
1165                 } else {
1166                         return $this->successfulLogin();
1167                 }
1168         }
1169
1170         /**
1171          * @private
1172          */
1173         function throttleHit( $limit ) {
1174                 $this->mainLoginForm( wfMsgExt( 'acct_creation_throttle_hit', array( 'parseinline' ), $limit ) );
1175         }
1176
1177         /**
1178          * Produce a bar of links which allow the user to select another language
1179          * during login/registration but retain "returnto"
1180          *
1181          * @return string
1182          */
1183         function makeLanguageSelector() {
1184                 global $wgLang;
1185
1186                 $msg = wfMessage( 'loginlanguagelinks' )->inContentLanguage();
1187                 if( !$msg->isBlank() ) {
1188                         $langs = explode( "\n", $msg->text() );
1189                         $links = array();
1190                         foreach( $langs as $lang ) {
1191                                 $lang = trim( $lang, '* ' );
1192                                 $parts = explode( '|', $lang );
1193                                 if ( count( $parts ) >= 2 ) {
1194                                         $links[] = $this->makeLanguageSelectorLink( $parts[0], trim( $parts[1] ) );
1195                                 }
1196                         }
1197                         return count( $links ) > 0 ? wfMsgHtml( 'loginlanguagelabel', $wgLang->pipeList( $links ) ) : '';
1198                 } else {
1199                         return '';
1200                 }
1201         }
1202
1203         /**
1204          * Create a language selector link for a particular language
1205          * Links back to this page preserving type and returnto
1206          *
1207          * @param $text Link text
1208          * @param $lang Language code
1209          */
1210         function makeLanguageSelectorLink( $text, $lang ) {
1211                 $self = SpecialPage::getTitleFor( 'Userlogin' );
1212                 $attr = array( 'uselang' => $lang );
1213                 if( $this->mType == 'signup' ) {
1214                         $attr['type'] = 'signup';
1215                 }
1216                 if( $this->mReturnTo ) {
1217                         $attr['returnto'] = $this->mReturnTo;
1218                 }
1219                 return Linker::linkKnown(
1220                         $self,
1221                         htmlspecialchars( $text ),
1222                         array(),
1223                         $attr
1224                 );
1225         }
1226 }