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, $wgRequest;
 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 = $wgRequest->getIP();
 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                 // Hook point to change $wgAccountCreationThrottle
 381                 wfRunHooks( 'ChangeAccountCreationThrottle', array( $ip, &$wgAccountCreationThrottle ) );
 382
 383                 if ( $wgAccountCreationThrottle && $wgUser->isPingLimitable() ) {
 384                         $key = wfMemcKey( 'acctcreate', 'ip', $ip );
 385                         $value = $wgMemc->get( $key );
 386                         if ( !$value ) {
 387                                 $wgMemc->set( $key, 0, 86400 );
 388                         }
 389                         if ( $value >= $wgAccountCreationThrottle ) {
 390                                 $this->throttleHit( $wgAccountCreationThrottle );
 391                                 return false;
 392                         }
 393                         $wgMemc->incr( $key );
 394                 }
 395
 396                 if( !$wgAuth->addUser( $u, $this->mPassword, $this->mEmail, $this->mRealName ) ) {
 397                         $this->mainLoginForm( wfMsg( 'externaldberror' ) );
 398                         return false;
 399                 }
 400
 401                 self::clearCreateaccountToken();
 402                 return $this->initUser( $u, false );
 403         }
 404
 405         /**
 406          * Actually add a user to the database.
 407          * Give it a User object that has been initialised with a name.
 408          *
 409          * @param $u User object.
 410          * @param $autocreate boolean -- true if this is an autocreation via auth plugin
 411          * @return User object.
 412          * @private
 413          */
 414         function initUser( $u, $autocreate ) {
 415                 global $wgAuth;
 416
 417                 $u->addToDatabase();
 418
 419                 if ( $wgAuth->allowPasswordChange() ) {
 420                         $u->setPassword( $this->mPassword );
 421                 }
 422
 423                 $u->setEmail( $this->mEmail );
 424                 $u->setRealName( $this->mRealName );
 425                 $u->setToken();
 426
 427                 $wgAuth->initUser( $u, $autocreate );
 428
 429                 if ( $this->mExtUser ) {
 430                         $this->mExtUser->linkToLocal( $u->getId() );
 431                         $email = $this->mExtUser->getPref( 'emailaddress' );
 432                         if ( $email && !$this->mEmail ) {
 433                                 $u->setEmail( $email );
 434                         }
 435                 }
 436
 437                 $u->setOption( 'rememberpassword', $this->mRemember ? 1 : 0 );
 438                 $u->saveSettings();
 439
 440                 # Update user count
 441                 $ssUpdate = new SiteStatsUpdate( 0, 0, 0, 0, 1 );
 442                 $ssUpdate->doUpdate();
 443
 444                 return $u;
 445         }
 446
 447         /**
 448          * Internally authenticate the login request.
 449          *
 450          * This may create a local account as a side effect if the
 451          * authentication plugin allows transparent local account
 452          * creation.
 453          */
 454         public function authenticateUserData() {
 455                 global $wgUser, $wgAuth;
 456
 457                 if ( $this->mUsername == '' ) {
 458                         return self::NO_NAME;
 459                 }
 460
 461                 // We require a login token to prevent login CSRF
 462                 // Handle part of this before incrementing the throttle so
 463                 // token-less login attempts don't count towards the throttle
 464                 // but wrong-token attempts do.
 465
 466                 // If the user doesn't have a login token yet, set one.
 467                 if ( !self::getLoginToken() ) {
 468                         self::setLoginToken();
 469                         return self::NEED_TOKEN;
 470                 }
 471                 // If the user didn't pass a login token, tell them we need one
 472                 if ( !$this->mToken ) {
 473                         return self::NEED_TOKEN;
 474                 }
 475
 476                 $throttleCount = self::incLoginThrottle( $this->mUsername );
 477                 if ( $throttleCount === true ) {
 478                         return self::THROTTLED;
 479                 }
 480
 481                 // Validate the login token
 482                 if ( $this->mToken !== self::getLoginToken() ) {
 483                         return self::WRONG_TOKEN;
 484                 }
 485
 486                 // Load $wgUser now, and check to see if we're logging in as the same
 487                 // name. This is necessary because loading $wgUser (say by calling
 488                 // getName()) calls the UserLoadFromSession hook, which potentially
 489                 // creates the user in the database. Until we load $wgUser, checking
 490                 // for user existence using User::newFromName($name)->getId() below
 491                 // will effectively be using stale data.
 492                 if ( $wgUser->getName() === $this->mUsername ) {
 493                         wfDebug( __METHOD__ . ": already logged in as {$this->mUsername}\n" );
 494                         return self::SUCCESS;
 495                 }
 496
 497                 $this->mExtUser = ExternalUser::newFromName( $this->mUsername );
 498
 499                 # TODO: Allow some magic here for invalid external names, e.g., let the
 500                 # user choose a different wiki name.
 501                 $u = User::newFromName( $this->mUsername );
 502                 if( !( $u instanceof User ) || !User::isUsableName( $u->getName() ) ) {
 503                         return self::ILLEGAL;
 504                 }
 505
 506                 $isAutoCreated = false;
 507                 if ( 0 == $u->getID() ) {
 508                         $status = $this->attemptAutoCreate( $u );
 509                         if ( $status !== self::SUCCESS ) {
 510                                 return $status;
 511                         } else {
 512                                 $isAutoCreated = true;
 513                         }
 514                 } else {
 515                         global $wgExternalAuthType, $wgAutocreatePolicy;
 516                         if ( $wgExternalAuthType && $wgAutocreatePolicy != 'never'
 517                         && is_object( $this->mExtUser )
 518                         && $this->mExtUser->authenticate( $this->mPassword ) ) {
 519                                 # The external user and local user have the same name and
 520                                 # password, so we assume they're the same.
 521                                 $this->mExtUser->linkToLocal( $u->getID() );
 522                         }
 523
 524                         $u->load();
 525                 }
 526
 527                 // Give general extensions, such as a captcha, a chance to abort logins
 528                 $abort = self::ABORTED;
 529                 if( !wfRunHooks( 'AbortLogin', array( $u, $this->mPassword, &$abort, &$this->mAbortLoginErrorMsg ) ) ) {
 530                         return $abort;
 531                 }
 532
 533                 global $wgBlockDisablesLogin;
 534                 if ( !$u->checkPassword( $this->mPassword ) ) {
 535                         if( $u->checkTemporaryPassword( $this->mPassword ) ) {
 536                                 // The e-mailed temporary password should not be used for actu-
 537                                 // al logins; that's a very sloppy habit, and insecure if an
 538                                 // attacker has a few seconds to click "search" on someone's o-
 539                                 // pen mail reader.
 540                                 //
 541                                 // Allow it to be used only to reset the password a single time
 542                                 // to a new value, which won't be in the user's e-mail ar-
 543                                 // chives.
 544                                 //
 545                                 // For backwards compatibility, we'll still recognize it at the
 546                                 // login form to minimize surprises for people who have been
 547                                 // logging in with a temporary password for some time.
 548                                 //
 549                                 // As a side-effect, we can authenticate the user's e-mail ad-
 550                                 // dress if it's not already done, since the temporary password
 551                                 // was sent via e-mail.
 552                                 if( !$u->isEmailConfirmed() ) {
 553                                         $u->confirmEmail();
 554                                         $u->saveSettings();
 555                                 }
 556
 557                                 // At this point we just return an appropriate code/ indicating
 558                                 // that the UI should show a password reset form; bot inter-
 559                                 // faces etc will probably just fail cleanly here.
 560                                 $retval = self::RESET_PASS;
 561                         } else {
 562                                 $retval = ( $this->mPassword  == '' ) ? self::EMPTY_PASS : self::WRONG_PASS;
 563                         }
 564                 } elseif ( $wgBlockDisablesLogin && $u->isBlocked() ) {
 565                         // If we've enabled it, make it so that a blocked user cannot login
 566                         $retval = self::USER_BLOCKED;
 567                 } else {
 568                         $wgAuth->updateUser( $u );
 569                         $wgUser = $u;
 570
 571                         // Please reset throttle for successful logins, thanks!
 572                         if ( $throttleCount ) {
 573                                 self::clearLoginThrottle( $this->mUsername );
 574                         }
 575
 576                         if ( $isAutoCreated ) {
 577                                 // Must be run after $wgUser is set, for correct new user log
 578                                 wfRunHooks( 'AuthPluginAutoCreate', array( $wgUser ) );
 579                         }
 580
 581                         $retval = self::SUCCESS;
 582                 }
 583                 wfRunHooks( 'LoginAuthenticateAudit', array( $u, $this->mPassword, $retval ) );
 584                 return $retval;
 585         }
 586
 587         /*
 588          * Increment the login attempt throttle hit count for the (username,current IP)
 589          * tuple unless the throttle was already reached.
 590          * @param $username string The user name
 591          * @return Bool|Integer The integer hit count or True if it is already at the limit
 592          */
 593         public static function incLoginThrottle( $username ) {
 594                 global $wgPasswordAttemptThrottle, $wgMemc, $wgRequest;
 595                 $username = trim( $username ); // sanity
 596
 597                 $throttleCount = 0;
 598                 if ( is_array( $wgPasswordAttemptThrottle ) ) {
 599                         $throttleKey = wfMemcKey( 'password-throttle', $wgRequest->getIP(), md5( $username ) );
 600                         $count = $wgPasswordAttemptThrottle['count'];
 601                         $period = $wgPasswordAttemptThrottle['seconds'];
 602
 603                         $throttleCount = $wgMemc->get( $throttleKey );
 604                         if ( !$throttleCount ) {
 605                                 $wgMemc->add( $throttleKey, 1, $period ); // start counter
 606                         } elseif ( $throttleCount < $count ) {
 607                                 $wgMemc->incr( $throttleKey );
 608                         } elseif ( $throttleCount >= $count ) {
 609                                 return true;
 610                         }
 611                 }
 612
 613                 return $throttleCount;
 614         }
 615
 616         /*
 617          * Clear the login attempt throttle hit count for the (username,current IP) tuple.
 618          * @param $username string The user name
 619          * @return void
 620          */
 621         public static function clearLoginThrottle( $username ) {
 622                 global $wgMemc, $wgRequest;
 623                 $username = trim( $username ); // sanity
 624
 625                 $throttleKey = wfMemcKey( 'password-throttle', $wgRequest->getIP(), md5( $username ) );
 626                 $wgMemc->delete( $throttleKey );
 627         }
 628
 629         /**
 630          * Attempt to automatically create a user on login. Only succeeds if there
 631          * is an external authentication method which allows it.
 632          *
 633          * @param $user User
 634          *
 635          * @return integer Status code
 636          */
 637         function attemptAutoCreate( $user ) {
 638                 global $wgAuth, $wgUser, $wgAutocreatePolicy;
 639
 640                 if ( $wgUser->isBlockedFromCreateAccount() ) {
 641                         wfDebug( __METHOD__ . ": user is blocked from account creation\n" );
 642                         return self::CREATE_BLOCKED;
 643                 }
 644
 645                 /**
 646                  * If the external authentication plugin allows it, automatically cre-
 647                  * ate a new account for users that are externally defined but have not
 648                  * yet logged in.
 649                  */
 650                 if ( $this->mExtUser ) {
 651                         # mExtUser is neither null nor false, so use the new ExternalAuth
 652                         # system.
 653                         if ( $wgAutocreatePolicy == 'never' ) {
 654                                 return self::NOT_EXISTS;
 655                         }
 656                         if ( !$this->mExtUser->authenticate( $this->mPassword ) ) {
 657                                 return self::WRONG_PLUGIN_PASS;
 658                         }
 659                 } else {
 660                         # Old AuthPlugin.
 661                         if ( !$wgAuth->autoCreate() ) {
 662                                 return self::NOT_EXISTS;
 663                         }
 664                         if ( !$wgAuth->userExists( $user->getName() ) ) {
 665                                 wfDebug( __METHOD__ . ": user does not exist\n" );
 666                                 return self::NOT_EXISTS;
 667                         }
 668                         if ( !$wgAuth->authenticate( $user->getName(), $this->mPassword ) ) {
 669                                 wfDebug( __METHOD__ . ": \$wgAuth->authenticate() returned false, aborting\n" );
 670                                 return self::WRONG_PLUGIN_PASS;
 671                         }
 672                 }
 673
 674                 $abortError = '';
 675                 if( !wfRunHooks( 'AbortAutoAccount', array( $user, &$abortError ) ) ) {
 676                         // Hook point to add extra creation throttles and blocks
 677                         wfDebug( "LoginForm::attemptAutoCreate: a hook blocked creation: $abortError\n" );
 678                         $this->mAbortLoginErrorMsg = $abortError;
 679                         return self::ABORTED;
 680                 }
 681
 682                 wfDebug( __METHOD__ . ": creating account\n" );
 683                 $this->initUser( $user, true );
 684                 return self::SUCCESS;
 685         }
 686
 687         function processLogin() {
 688                 global $wgUser, $wgRequest, $wgLang;
 689
 690                 switch ( $this->authenticateUserData() ) {
 691                         case self::SUCCESS:
 692                                 # We've verified now, update the real record
 693                                 if( (bool)$this->mRemember != (bool)$wgUser->getOption( 'rememberpassword' ) ) {
 694                                         $wgUser->setOption( 'rememberpassword', $this->mRemember ? 1 : 0 );
 695                                         $wgUser->saveSettings();
 696                                 } else {
 697                                         $wgUser->invalidateCache();
 698                                 }
 699                                 $wgUser->setCookies();
 700                                 self::clearLoginToken();
 701
 702                                 // Reset the throttle
 703                                 $key = wfMemcKey( 'password-throttle', $wgRequest->getIP(), md5( $this->mUsername ) );
 704                                 global $wgMemc;
 705                                 $wgMemc->delete( $key );
 706
 707                                 if( $this->hasSessionCookie() || $this->mSkipCookieCheck ) {
 708                                         /* Replace the language object to provide user interface in
 709                                          * correct language immediately on this first page load.
 710                                          */
 711                                         $code = $wgRequest->getVal( 'uselang', $wgUser->getOption( 'language' ) );
 712                                         $wgLang = Language::factory( $code );
 713                                         return $this->successfulLogin();
 714                                 } else {
 715                                         return $this->cookieRedirectCheck( 'login' );
 716                                 }
 717                                 break;
 718
 719                         case self::NEED_TOKEN:
 720                                 $this->mainLoginForm( wfMsgExt( 'nocookiesforlogin', array( 'parseinline' ) ) );
 721                                 break;
 722                         case self::WRONG_TOKEN:
 723                                 $this->mainLoginForm( wfMsg( 'sessionfailure' ) );
 724                                 break;
 725                         case self::NO_NAME:
 726                         case self::ILLEGAL:
 727                                 $this->mainLoginForm( wfMsg( 'noname' ) );
 728                                 break;
 729                         case self::WRONG_PLUGIN_PASS:
 730                                 $this->mainLoginForm( wfMsg( 'wrongpassword' ) );
 731                                 break;
 732                         case self::NOT_EXISTS:
 733                                 if( $wgUser->isAllowed( 'createaccount' ) ) {
 734                                         $this->mainLoginForm( wfMsgExt( 'nosuchuser', 'parseinline',
 735                                            wfEscapeWikiText( $this->mUsername ) ) );
 736                                 } else {
 737                                         $this->mainLoginForm( wfMsg( 'nosuchusershort',
 738                                                 wfEscapeWikiText( $this->mUsername ) ) );
 739                                 }
 740                                 break;
 741                         case self::WRONG_PASS:
 742                                 $this->mainLoginForm( wfMsg( 'wrongpassword' ) );
 743                                 break;
 744                         case self::EMPTY_PASS:
 745                                 $this->mainLoginForm( wfMsg( 'wrongpasswordempty' ) );
 746                                 break;
 747                         case self::RESET_PASS:
 748                                 $this->resetLoginForm( wfMsg( 'resetpass_announce' ) );
 749                                 break;
 750                         case self::CREATE_BLOCKED:
 751                                 $this->userBlockedMessage( $wgUser->mBlock );
 752                                 break;
 753                         case self::THROTTLED:
 754                                 $this->mainLoginForm( wfMsg( 'login-throttled' ) );
 755                                 break;
 756                         case self::USER_BLOCKED:
 757                                 $this->mainLoginForm( wfMsgExt( 'login-userblocked',
 758                                         array( 'parsemag', 'escape' ), $this->mUsername ) );
 759                                 break;
 760                         case self::ABORTED:
 761                                 $this->mainLoginForm( wfMsg( $this->mAbortLoginErrorMsg  ) );
 762                                 break;
 763                         default:
 764                                 throw new MWException( 'Unhandled case value' );
 765                 }
 766         }
 767
 768         function resetLoginForm( $error ) {
 769                 global $wgOut;
 770                 $wgOut->addHTML( Xml::element('p', array( 'class' => 'error' ), $error ) );
 771                 $reset = new SpecialChangePassword();
 772                 $reset->execute( null );
 773         }
 774
 775         /**
 776          * @param $u User object
 777          * @param $throttle Boolean
 778          * @param $emailTitle String: message name of email title
 779          * @param $emailText String: message name of email text
 780          * @return Status object
 781          * @private
 782          */
 783         function mailPasswordInternal( $u, $throttle = true, $emailTitle = 'passwordremindertitle', $emailText = 'passwordremindertext' ) {
 784                 global $wgServer, $wgScript, $wgUser, $wgNewPasswordExpiry, $wgRequest;
 785
 786                 if ( $u->getEmail() == '' ) {
 787                         return Status::newFatal( 'noemail', $u->getName() );
 788                 }
 789                 $ip = $wgRequest->getIP();
 790                 if( !$ip ) {
 791                         return Status::newFatal( 'badipaddress' );
 792                 }
 793
 794                 wfRunHooks( 'User::mailPasswordInternal', array( &$wgUser, &$ip, &$u ) );
 795
 796                 $np = $u->randomPassword();
 797                 $u->setNewpassword( $np, $throttle );
 798                 $u->saveSettings();
 799                 $userLanguage = $u->getOption( 'language' );
 800                 $m = wfMsgExt( $emailText, array( 'parsemag', 'language' => $userLanguage ), $ip, $u->getName(), $np,
 801                                 $wgServer . $wgScript, round( $wgNewPasswordExpiry / 86400 ) );
 802                 $result = $u->sendMail( wfMsgExt( $emailTitle, array( 'parsemag', 'language' => $userLanguage ) ), $m );
 803
 804                 return $result;
 805         }
 806
 807
 808         /**
 809          * Run any hooks registered for logins, then HTTP redirect to
 810          * $this->mReturnTo (or Main Page if that's undefined).  Formerly we had a
 811          * nice message here, but that's really not as useful as just being sent to
 812          * wherever you logged in from.  It should be clear that the action was
 813          * successful, given the lack of error messages plus the appearance of your
 814          * name in the upper right.
 815          *
 816          * @private
 817          */
 818         function successfulLogin() {
 819                 global $wgUser, $wgOut;
 820
 821                 # Run any hooks; display injected HTML if any, else redirect
 822                 $injected_html = '';
 823                 wfRunHooks( 'UserLoginComplete', array( &$wgUser, &$injected_html ) );
 824
 825                 if( $injected_html !== '' ) {
 826                         $this->displaySuccessfulLogin( 'loginsuccess', $injected_html );
 827                 } else {
 828                         $titleObj = Title::newFromText( $this->mReturnTo );
 829                         if ( !$titleObj instanceof Title ) {
 830                                 $titleObj = Title::newMainPage();
 831                         }
 832                         $redirectUrl = $titleObj->getFullURL( $this->mReturnToQuery );
 833                         global $wgSecureLogin;
 834                         if( $wgSecureLogin && !$this->mStickHTTPS ) {
 835                                 $redirectUrl = preg_replace( '/^https:/', 'http:', $redirectUrl );
 836                         }
 837                         $wgOut->redirect( $redirectUrl );
 838                 }
 839         }
 840
 841         /**
 842          * Run any hooks registered for logins, then display a message welcoming
 843          * the user.
 844          *
 845          * @private
 846          */
 847         function successfulCreation() {
 848                 global $wgUser;
 849                 # Run any hooks; display injected HTML
 850                 $injected_html = '';
 851                 $welcome_creation_msg = 'welcomecreation';
 852
 853                 wfRunHooks( 'UserLoginComplete', array( &$wgUser, &$injected_html ) );
 854
 855                 //let any extensions change what message is shown
 856                 wfRunHooks( 'BeforeWelcomeCreation', array( &$welcome_creation_msg, &$injected_html ) );
 857
 858                 $this->displaySuccessfulLogin( $welcome_creation_msg, $injected_html );
 859         }
 860
 861         /**
 862          * Display a "login successful" page.
 863          */
 864         private function displaySuccessfulLogin( $msgname, $injected_html ) {
 865                 global $wgOut, $wgUser;
 866
 867                 $wgOut->setPageTitle( wfMsg( 'loginsuccesstitle' ) );
 868                 if( $msgname ){
 869                         $wgOut->addWikiMsg( $msgname, wfEscapeWikiText( $wgUser->getName() ) );
 870                 }
 871
 872                 $wgOut->addHTML( $injected_html );
 873
 874                 if ( !empty( $this->mReturnTo ) ) {
 875                         $wgOut->returnToMain( null, $this->mReturnTo, $this->mReturnToQuery );
 876                 } else {
 877                         $wgOut->returnToMain( null );
 878                 }
 879         }
 880
 881         /**
 882          * Output a message that informs the user that they cannot create an account because
 883          * there is a block on them or their IP which prevents account creation.  Note that
 884          * User::isBlockedFromCreateAccount(), which gets this block, ignores the 'hardblock'
 885          * setting on blocks (bug 13611).
 886          * @param $block Block the block causing this error
 887          */
 888         function userBlockedMessage( Block $block ) {
 889                 global $wgOut;
 890
 891                 # Let's be nice about this, it's likely that this feature will be used
 892                 # for blocking large numbers of innocent people, e.g. range blocks on
 893                 # schools. Don't blame it on the user. There's a small chance that it
 894                 # really is the user's fault, i.e. the username is blocked and they
 895                 # haven't bothered to log out before trying to create an account to
 896                 # evade it, but we'll leave that to their guilty conscience to figure
 897                 # out.
 898
 899                 $wgOut->setPageTitle( wfMsg( 'cantcreateaccounttitle' ) );
 900
 901                 $block_reason = $block->mReason;
 902                 if ( strval( $block_reason ) === '' ) {
 903                         $block_reason = wfMsg( 'blockednoreason' );
 904                 }
 905
 906                 $wgOut->addWikiMsg(
 907                         'cantcreateaccount-text',
 908                         $block->getTarget(),
 909                         $block_reason,
 910                         $block->getBlocker()->getName()
 911                 );
 912
 913                 $wgOut->returnToMain( false );
 914         }
 915
 916         /**
 917          * @private
 918          */
 919         function mainLoginForm( $msg, $msgtype = 'error' ) {
 920                 global $wgUser, $wgOut, $wgHiddenPrefs;
 921                 global $wgEnableEmail, $wgEnableUserEmail;
 922                 global $wgRequest, $wgLoginLanguageSelector;
 923                 global $wgAuth, $wgEmailConfirmToEdit, $wgCookieExpiration;
 924                 global $wgSecureLogin, $wgPasswordResetRoutes;
 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( $wgUser->isBlockedFromCreateAccount() );
 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->mUsername == '' ) {
 945                         if ( $wgUser->isLoggedIn() ) {
 946                                 $this->mUsername = $wgUser->getName();
 947                         } else {
 948                                 $this->mUsername = $wgRequest->getCookie( 'UserName' );
 949                         }
 950                 }
 951
 952                 if ( $this->mType == 'signup' ) {
 953                         $template = new UsercreateTemplate();
 954                         $q = 'action=submitlogin&type=signup';
 955                         $linkq = 'type=login';
 956                         $linkmsg = 'gotaccount';
 957                 } else {
 958                         $template = new UserloginTemplate();
 959                         $q = 'action=submitlogin&type=login';
 960                         $linkq = 'type=signup';
 961                         $linkmsg = 'nologin';
 962                 }
 963
 964                 if ( !empty( $this->mReturnTo ) ) {
 965                         $returnto = '&returnto=' . wfUrlencode( $this->mReturnTo );
 966                         if ( !empty( $this->mReturnToQuery ) ) {
 967                                 $returnto .= '&returntoquery=' .
 968                                         wfUrlencode( $this->mReturnToQuery );
 969                         }
 970                         $q .= $returnto;
 971                         $linkq .= $returnto;
 972                 }
 973
 974                 # Pass any language selection on to the mode switch link
 975                 if( $wgLoginLanguageSelector && $this->mLanguage ) {
 976                         $linkq .= '&uselang=' . $this->mLanguage;
 977                 }
 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', wfMsgExt( $linkmsg, array( 'parseinline', 'replaceafter' ), $link ) );
 986                 } else {
 987                         $template->set( 'link', '' );
 988                 }
 989
 990                 $resetLink = $this->mType == 'signup'
 991                         ? null
 992                         : is_array( $wgPasswordResetRoutes ) && in_array( true, array_values( $wgPasswordResetRoutes ) );
 993
 994                 $template->set( 'header', '' );
 995                 $template->set( 'name', $this->mUsername );
 996                 $template->set( 'password', $this->mPassword );
 997                 $template->set( 'retype', $this->mRetype );
 998                 $template->set( 'email', $this->mEmail );
 999                 $template->set( 'realname', $this->mRealName );
1000                 $template->set( 'domain', $this->mDomain );
1001                 $template->set( 'reason', $this->mReason );
1002
1003                 $template->set( 'action', $titleObj->getLocalURL( $q ) );
1004                 $template->set( 'message', $msg );
1005                 $template->set( 'messagetype', $msgtype );
1006                 $template->set( 'createemail', $wgEnableEmail && $wgUser->isLoggedIn() );
1007                 $template->set( 'userealname', !in_array( 'realname', $wgHiddenPrefs ) );
1008                 $template->set( 'useemail', $wgEnableEmail );
1009                 $template->set( 'emailrequired', $wgEmailConfirmToEdit );
1010                 $template->set( 'emailothers', $wgEnableUserEmail );
1011                 $template->set( 'canreset', $wgAuth->allowPasswordChange() );
1012                 $template->set( 'resetlink', $resetLink );
1013                 $template->set( 'canremember', ( $wgCookieExpiration > 0 ) );
1014                 $template->set( 'usereason', $wgUser->isLoggedIn() );
1015                 $template->set( 'remember', $wgUser->getOption( 'rememberpassword' ) || $this->mRemember );
1016                 $template->set( 'cansecurelogin', ( $wgSecureLogin === true ) );
1017                 $template->set( 'stickHTTPS', $this->mStickHTTPS );
1018
1019                 if ( $this->mType == 'signup' ) {
1020                         if ( !self::getCreateaccountToken() ) {
1021                                 self::setCreateaccountToken();
1022                         }
1023                         $template->set( 'token', self::getCreateaccountToken() );
1024                 } else {
1025                         if ( !self::getLoginToken() ) {
1026                                 self::setLoginToken();
1027                         }
1028                         $template->set( 'token', self::getLoginToken() );
1029                 }
1030
1031                 # Prepare language selection links as needed
1032                 if( $wgLoginLanguageSelector ) {
1033                         $template->set( 'languages', $this->makeLanguageSelector() );
1034                         if( $this->mLanguage )
1035                                 $template->set( 'uselang', $this->mLanguage );
1036                 }
1037
1038                 // Give authentication and captcha plugins a chance to modify the form
1039                 $wgAuth->modifyUITemplate( $template, $this->mType );
1040                 if ( $this->mType == 'signup' ) {
1041                         wfRunHooks( 'UserCreateForm', array( &$template ) );
1042                 } else {
1043                         wfRunHooks( 'UserLoginForm', array( &$template ) );
1044                 }
1045
1046                 // Changes the title depending on permissions for creating account
1047                 if ( $wgUser->isAllowed( 'createaccount' ) ) {
1048                         $wgOut->setPageTitle( wfMsg( 'userlogin' ) );
1049                 } else {
1050                         $wgOut->setPageTitle( wfMsg( 'userloginnocreate' ) );
1051                 }
1052
1053                 $wgOut->disallowUserJs(); // just in case...
1054                 $wgOut->addTemplate( $template );
1055         }
1056
1057         /**
1058          * @private
1059          *
1060          * @param $user User
1061          *
1062          * @return Boolean
1063          */
1064         function showCreateOrLoginLink( &$user ) {
1065                 if( $this->mType == 'signup' ) {
1066                         return true;
1067                 } elseif( $user->isAllowed( 'createaccount' ) ) {
1068                         return true;
1069                 } else {
1070                         return false;
1071                 }
1072         }
1073
1074         /**
1075          * Check if a session cookie is present.
1076          *
1077          * This will not pick up a cookie set during _this_ request, but is meant
1078          * to ensure that the client is returning the cookie which was set on a
1079          * previous pass through the system.
1080          *
1081          * @private
1082          */
1083         function hasSessionCookie() {
1084                 global $wgDisableCookieCheck, $wgRequest;
1085                 return $wgDisableCookieCheck ? true : $wgRequest->checkSessionCookie();
1086         }
1087
1088         /**
1089          * Get the login token from the current session
1090          */
1091         public static function getLoginToken() {
1092                 global $wgRequest;
1093                 return $wgRequest->getSessionData( 'wsLoginToken' );
1094         }
1095
1096         /**
1097          * Randomly generate a new login token and attach it to the current session
1098          */
1099         public static function setLoginToken() {
1100                 global $wgRequest;
1101                 // Use User::generateToken() instead of $user->editToken()
1102                 // because the latter reuses $_SESSION['wsEditToken']
1103                 $wgRequest->setSessionData( 'wsLoginToken', User::generateToken() );
1104         }
1105
1106         /**
1107          * Remove any login token attached to the current session
1108          */
1109         public static function clearLoginToken() {
1110                 global $wgRequest;
1111                 $wgRequest->setSessionData( 'wsLoginToken', null );
1112         }
1113
1114         /**
1115          * Get the createaccount token from the current session
1116          */
1117         public static function getCreateaccountToken() {
1118                 global $wgRequest;
1119                 return $wgRequest->getSessionData( 'wsCreateaccountToken' );
1120         }
1121
1122         /**
1123          * Randomly generate a new createaccount token and attach it to the current session
1124          */
1125         public static function setCreateaccountToken() {
1126                 global $wgRequest;
1127                 $wgRequest->setSessionData( 'wsCreateaccountToken', User::generateToken() );
1128         }
1129
1130         /**
1131          * Remove any createaccount token attached to the current session
1132          */
1133         public static function clearCreateaccountToken() {
1134                 global $wgRequest;
1135                 $wgRequest->setSessionData( 'wsCreateaccountToken', null );
1136         }
1137
1138         /**
1139          * @private
1140          */
1141         function cookieRedirectCheck( $type ) {
1142                 global $wgOut;
1143
1144                 $titleObj = SpecialPage::getTitleFor( 'Userlogin' );
1145                 $query = array( 'wpCookieCheck' => $type );
1146                 if ( $this->mReturnTo ) {
1147                         $query['returnto'] = $this->mReturnTo;
1148                 }
1149                 $check = $titleObj->getFullURL( $query );
1150
1151                 return $wgOut->redirect( $check );
1152         }
1153
1154         /**
1155          * @private
1156          */
1157         function onCookieRedirectCheck( $type ) {
1158                 if ( !$this->hasSessionCookie() ) {
1159                         if ( $type == 'new' ) {
1160                                 return $this->mainLoginForm( wfMsgExt( 'nocookiesnew', array( 'parseinline' ) ) );
1161                         } elseif ( $type == 'login' ) {
1162                                 return $this->mainLoginForm( wfMsgExt( 'nocookieslogin', array( 'parseinline' ) ) );
1163                         } else {
1164                                 # shouldn't happen
1165                                 return $this->mainLoginForm( wfMsg( 'error' ) );
1166                         }
1167                 } else {
1168                         return $this->successfulLogin();
1169                 }
1170         }
1171
1172         /**
1173          * @private
1174          */
1175         function throttleHit( $limit ) {
1176                 $this->mainLoginForm( wfMsgExt( 'acct_creation_throttle_hit', array( 'parseinline' ), $limit ) );
1177         }
1178
1179         /**
1180          * Produce a bar of links which allow the user to select another language
1181          * during login/registration but retain "returnto"
1182          *
1183          * @return string
1184          */
1185         function makeLanguageSelector() {
1186                 global $wgLang;
1187
1188                 $msg = wfMessage( 'loginlanguagelinks' )->inContentLanguage();
1189                 if( !$msg->isBlank() ) {
1190                         $langs = explode( "\n", $msg->text() );
1191                         $links = array();
1192                         foreach( $langs as $lang ) {
1193                                 $lang = trim( $lang, '* ' );
1194                                 $parts = explode( '|', $lang );
1195                                 if ( count( $parts ) >= 2 ) {
1196                                         $links[] = $this->makeLanguageSelectorLink( $parts[0], trim( $parts[1] ) );
1197                                 }
1198                         }
1199                         return count( $links ) > 0 ? wfMsgHtml( 'loginlanguagelabel', $wgLang->pipeList( $links ) ) : '';
1200                 } else {
1201                         return '';
1202                 }
1203         }
1204
1205         /**
1206          * Create a language selector link for a particular language
1207          * Links back to this page preserving type and returnto
1208          *
1209          * @param $text Link text
1210          * @param $lang Language code
1211          */
1212         function makeLanguageSelectorLink( $text, $lang ) {
1213                 $self = SpecialPage::getTitleFor( 'Userlogin' );
1214                 $attr = array( 'uselang' => $lang );
1215                 if( $this->mType == 'signup' ) {
1216                         $attr['type'] = 'signup';
1217                 }
1218                 if( $this->mReturnTo ) {
1219                         $attr['returnto'] = $this->mReturnTo;
1220                 }
1221                 return Linker::linkKnown(
1222                         $self,
1223                         htmlspecialchars( $text ),
1224                         array(),
1225                         $attr
1226                 );
1227         }
1228 }