SpecialUserlogin.php

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<?php
class LoginForm extends SpecialPage {

        const SUCCESS = 0;
        const NO_NAME = 1;
        const ILLEGAL = 2;
        const WRONG_PLUGIN_PASS = 3;
        const NOT_EXISTS = 4;
        const WRONG_PASS = 5;
        const EMPTY_PASS = 6;
        const RESET_PASS = 7;
        const ABORTED = 8;
        const CREATE_BLOCKED = 9;
        const THROTTLED = 10;
        const USER_BLOCKED = 11;
        const NEED_TOKEN = 12;
        const WRONG_TOKEN = 13;

        var $mUsername, $mPassword, $mRetype, $mReturnTo, $mCookieCheck, $mPosted;
        var $mAction, $mCreateaccount, $mCreateaccountMail;
        var $mLoginattempt, $mRemember, $mEmail, $mDomain, $mLanguage;
        var $mSkipCookieCheck, $mReturnToQuery, $mToken, $mStickHTTPS;
        var $mType, $mReason, $mRealName;
        var $mAbortLoginErrorMsg = 'login-abort-generic';
        private $mLoaded = false;

        private $mExtUser = null;

        private $mOverrideRequest = null;

        public function __construct( $request = null ) {
                parent::__construct( 'Userlogin' );

                $this->mOverrideRequest = $request;
        }

        function load() {
                global $wgAuth, $wgHiddenPrefs, $wgEnableEmail;

                if ( $this->mLoaded ) {
                        return;
                }
                $this->mLoaded = true;

                if ( $this->mOverrideRequest === null ) {
                        $request = $this->getRequest();
                } else {
                        $request = $this->mOverrideRequest;
                }

                $this->mType = $request->getText( 'type' );
                $this->mUsername = $request->getText( 'wpName' );
                $this->mPassword = $request->getText( 'wpPassword' );
                $this->mRetype = $request->getText( 'wpRetype' );
                $this->mDomain = $request->getText( 'wpDomain' );
                $this->mReason = $request->getText( 'wpReason' );
                $this->mCookieCheck = $request->getVal( 'wpCookieCheck' );
                $this->mPosted = $request->wasPosted();
                $this->mCreateaccount = $request->getCheck( 'wpCreateaccount' );
                $this->mCreateaccountMail = $request->getCheck( 'wpCreateaccountMail' )
                                                                        && $wgEnableEmail;
                $this->mLoginattempt = $request->getCheck( 'wpLoginattempt' );
                $this->mAction = $request->getVal( 'action' );
                $this->mRemember = $request->getCheck( 'wpRemember' );
                $this->mStickHTTPS = $request->getCheck( 'wpStickHTTPS' );
                $this->mLanguage = $request->getText( 'uselang' );
                $this->mSkipCookieCheck = $request->getCheck( 'wpSkipCookieCheck' );
                $this->mToken = ( $this->mType == 'signup' ) ? $request->getVal( 'wpCreateaccountToken' ) : $request->getVal( 'wpLoginToken' );
                $this->mReturnTo = $request->getVal( 'returnto', '' );
                $this->mReturnToQuery = $request->getVal( 'returntoquery', '' );

                if( $wgEnableEmail ) {
                        $this->mEmail = $request->getText( 'wpEmail' );
                } else {
                        $this->mEmail = '';
                }
                if( !in_array( 'realname', $wgHiddenPrefs ) ) {
                        $this->mRealName = $request->getText( 'wpRealName' );
                } else {
                        $this->mRealName = '';
                }

                if( !$wgAuth->validDomain( $this->mDomain ) ) {
                        $this->mDomain = $wgAuth->getDomain();
                }
                $wgAuth->setDomain( $this->mDomain );

                # 1. When switching accounts, it sucks to get automatically logged out
                # 2. Do not return to PasswordReset after a successful password change
                #    but goto Wiki start page (Main_Page) instead ( bug 33997 )
                $returnToTitle = Title::newFromText( $this->mReturnTo );
                if( is_object( $returnToTitle ) && (
                        $returnToTitle->isSpecial( 'Userlogout' )
                        || $returnToTitle->isSpecial( 'PasswordReset' ) ) ) {
                        $this->mReturnTo = '';
                        $this->mReturnToQuery = '';
                }
        }

        function getDescription() {
                return $this->msg( $this->getUser()->isAllowed( 'createaccount' ) ?
                        'userlogin' : 'userloginnocreate' )->text();
        }

        public function execute( $par ) {
                if ( session_id() == '' ) {
                        wfSetupSession();
                }

                $this->load();
                $this->setHeaders();

                global $wgSecureLogin;
                if (
                        $this->mType !== 'signup' &&
                        $wgSecureLogin &&
                        WebRequest::detectProtocol() !== 'https'
                ) {
                        $title = $this->getFullTitle();
                        $query = array(
                                'returnto' => $this->mReturnTo,
                                'returntoquery' => $this->mReturnToQuery,
                                'wpStickHTTPS' => $this->mStickHTTPS
                        );
                        $url = $title->getFullURL( $query, false, PROTO_HTTPS );
                        $this->getOutput()->redirect( $url );
                        return;
                }

                if ( $par == 'signup' ) { # Check for [[Special:Userlogin/signup]]
                        $this->mType = 'signup';
                }

                if ( !is_null( $this->mCookieCheck ) ) {
                        $this->onCookieRedirectCheck( $this->mCookieCheck );
                        return;
                } elseif( $this->mPosted ) {
                        if( $this->mCreateaccount ) {
                                $this->addNewAccount();
                                return;
                        } elseif ( $this->mCreateaccountMail ) {
                                $this->addNewAccountMailPassword();
                                return;
                        } elseif ( ( 'submitlogin' == $this->mAction ) || $this->mLoginattempt ) {
                                $this->processLogin();
                                return;
                        }
                }
                $this->mainLoginForm( '' );
        }

        function addNewAccountMailPassword() {
                if ( $this->mEmail == '' ) {
                        $this->mainLoginForm( $this->msg( 'noemailcreate' )->escaped() );
                        return;
                }

                $u = $this->addNewaccountInternal();

                if ( $u == null ) {
                        return;
                }

                // Wipe the initial password and mail a temporary one
                $u->setPassword( null );
                $u->saveSettings();
                $result = $this->mailPasswordInternal( $u, false, 'createaccount-title', 'createaccount-text' );

                wfRunHooks( 'AddNewAccount', array( $u, true ) );
                $u->addNewUserLogEntry( true, $this->mReason );

                $out = $this->getOutput();
                $out->setPageTitle( $this->msg( 'accmailtitle' ) );

                if( !$result->isGood() ) {
                        $this->mainLoginForm( $this->msg( 'mailerror', $result->getWikiText() )->text() );
                } else {
                        $out->addWikiMsg( 'accmailtext', $u->getName(), $u->getEmail() );
                        $this->executeReturnTo( 'success' );
                }
        }

        function addNewAccount() {
                global $wgUser, $wgEmailAuthentication, $wgLoginLanguageSelector;

                # Create the account and abort if there's a problem doing so
                $u = $this->addNewAccountInternal();
                if( $u == null ) {
                        return false;
                }

                # If we showed up language selection links, and one was in use, be
                # smart (and sensible) and save that language as the user's preference
                if( $wgLoginLanguageSelector && $this->mLanguage ) {
                        $u->setOption( 'language', $this->mLanguage );
                }

                $out = $this->getOutput();

                # Send out an email authentication message if needed
                if( $wgEmailAuthentication && Sanitizer::validateEmail( $u->getEmail() ) ) {
                        $status = $u->sendConfirmationMail();
                        if( $status->isGood() ) {
                                $out->addWikiMsg( 'confirmemail_oncreate' );
                        } else {
                                $out->addWikiText( $status->getWikiText( 'confirmemail_sendfailed' ) );
                        }
                }

                # Save settings (including confirmation token)
                $u->saveSettings();

                # If not logged in, assume the new account as the current one and set
                # session cookies then show a "welcome" message or a "need cookies"
                # message as needed
                if( $this->getUser()->isAnon() ) {
                        $u->setCookies();
                        $wgUser = $u;
                        // This should set it for OutputPage and the Skin
                        // which is needed or the personal links will be
                        // wrong.
                        $this->getContext()->setUser( $u );
                        wfRunHooks( 'AddNewAccount', array( $u, false ) );
                        $u->addNewUserLogEntry();
                        if( $this->hasSessionCookie() ) {
                                $this->successfulCreation();
                        } else {
                                $this->cookieRedirectCheck( 'new' );
                        }
                } else {
                        # Confirm that the account was created
                        $out->setPageTitle( $this->msg( 'accountcreated' ) );
                        $out->addWikiMsg( 'accountcreatedtext', $u->getName() );
                        $out->addReturnTo( $this->getTitle() );
                        wfRunHooks( 'AddNewAccount', array( $u, false ) );
                        $u->addNewUserLogEntry( false, $this->mReason );
                }
                return true;
        }

        function addNewAccountInternal() {
                global $wgAuth, $wgMemc, $wgAccountCreationThrottle,
                        $wgMinimalPasswordLength, $wgEmailConfirmToEdit;

                // If the user passes an invalid domain, something is fishy
                if( !$wgAuth->validDomain( $this->mDomain ) ) {
                        $this->mainLoginForm( $this->msg( 'wrongpassword' )->text() );
                        return false;
                }

                // If we are not allowing users to login locally, we should be checking
                // to see if the user is actually able to authenticate to the authenti-
                // cation server before they create an account (otherwise, they can
                // create a local account and login as any domain user). We only need
                // to check this for domains that aren't local.
                if( 'local' != $this->mDomain && $this->mDomain != '' ) {
                        if( !$wgAuth->canCreateAccounts() && ( !$wgAuth->userExists( $this->mUsername )
                                || !$wgAuth->authenticate( $this->mUsername, $this->mPassword ) ) ) {
                                $this->mainLoginForm( $this->msg( 'wrongpassword' )->text() );
                                return false;
                        }
                }

                if ( wfReadOnly() ) {
                        throw new ReadOnlyError;
                }

                # Request forgery checks.
                if ( !self::getCreateaccountToken() ) {
                        self::setCreateaccountToken();
                        $this->mainLoginForm( $this->msg( 'nocookiesfornew' )->parse() );
                        return false;
                }

                # The user didn't pass a createaccount token
                if ( !$this->mToken ) {
                        $this->mainLoginForm( $this->msg( 'sessionfailure' )->text() );
                        return false;
                }

                # Validate the createaccount token
                if ( $this->mToken !== self::getCreateaccountToken() ) {
                        $this->mainLoginForm( $this->msg( 'sessionfailure' )->text() );
                        return false;
                }

                # Check permissions
                $currentUser = $this->getUser();
                if ( !$currentUser->isAllowed( 'createaccount' ) ) {
                        throw new PermissionsError( 'createaccount' );
                } elseif ( $currentUser->isBlockedFromCreateAccount() ) {
                        $this->userBlockedMessage( $currentUser->isBlockedFromCreateAccount() );
                        return false;
                }

                # Include checks that will include GlobalBlocking (Bug 38333)
                $permErrors = $this->getTitle()->getUserPermissionsErrors( 'createaccount', $currentUser, true );
                if ( count( $permErrors ) ) {
                                throw new PermissionsError( 'createaccount', $permErrors );
                }

                $ip = $this->getRequest()->getIP();
                if ( $currentUser->isDnsBlacklisted( $ip, true /* check $wgProxyWhitelist */ ) ) {
                        $this->mainLoginForm( $this->msg( 'sorbs_create_account_reason' )->text() . ' ' . $this->msg( 'parentheses', $ip )->escaped() );
                        return false;
                }

                # Now create a dummy user ($u) and check if it is valid
                $name = trim( $this->mUsername );
                $u = User::newFromName( $name, 'creatable' );
                if ( !is_object( $u ) ) {
                        $this->mainLoginForm( $this->msg( 'noname' )->text() );
                        return false;
                }

                if ( 0 != $u->idForName() ) {
                        $this->mainLoginForm( $this->msg( 'userexists' )->text() );
                        return false;
                }

                if ( 0 != strcmp( $this->mPassword, $this->mRetype ) ) {
                        $this->mainLoginForm( $this->msg( 'badretype' )->text() );
                        return false;
                }

                # check for minimal password length
                $valid = $u->getPasswordValidity( $this->mPassword );
                if ( $valid !== true ) {
                        if ( !$this->mCreateaccountMail ) {
                                if ( is_array( $valid ) ) {
                                        $message = array_shift( $valid );
                                        $params = $valid;
                                } else {
                                        $message = $valid;
                                        $params = array( $wgMinimalPasswordLength );
                                }
                                $this->mainLoginForm( $this->msg( $message, $params )->text() );
                                return false;
                        } else {
                                # do not force a password for account creation by email
                                # set invalid password, it will be replaced later by a random generated password
                                $this->mPassword = null;
                        }
                }

                # if you need a confirmed email address to edit, then obviously you
                # need an email address.
                if ( $wgEmailConfirmToEdit && empty( $this->mEmail ) ) {
                        $this->mainLoginForm( $this->msg( 'noemailtitle' )->text() );
                        return false;
                }

                if( !empty( $this->mEmail ) && !Sanitizer::validateEmail( $this->mEmail ) ) {
                        $this->mainLoginForm( $this->msg( 'invalidemailaddress' )->text() );
                        return false;
                }

                # Set some additional data so the AbortNewAccount hook can be used for
                # more than just username validation
                $u->setEmail( $this->mEmail );
                $u->setRealName( $this->mRealName );

                $abortError = '';
                if( !wfRunHooks( 'AbortNewAccount', array( $u, &$abortError ) ) ) {
                        // Hook point to add extra creation throttles and blocks
                        wfDebug( "LoginForm::addNewAccountInternal: a hook blocked creation\n" );
                        $this->mainLoginForm( $abortError );
                        return false;
                }

                // Hook point to check for exempt from account creation throttle
                if ( !wfRunHooks( 'ExemptFromAccountCreationThrottle', array( $ip ) ) ) {
                        wfDebug( "LoginForm::exemptFromAccountCreationThrottle: a hook allowed account creation w/o throttle\n" );
                } else {
                        if ( ( $wgAccountCreationThrottle && $currentUser->isPingLimitable() ) ) {
                                $key = wfMemcKey( 'acctcreate', 'ip', $ip );
                                $value = $wgMemc->get( $key );
                                if ( !$value ) {
                                        $wgMemc->set( $key, 0, 86400 );
                                }
                                if ( $value >= $wgAccountCreationThrottle ) {
                                        $this->throttleHit( $wgAccountCreationThrottle );
                                        return false;
                                }
                                $wgMemc->incr( $key );
                        }
                }

                if( !$wgAuth->addUser( $u, $this->mPassword, $this->mEmail, $this->mRealName ) ) {
                        $this->mainLoginForm( $this->msg( 'externaldberror' )->text() );
                        return false;
                }

                self::clearCreateaccountToken();

                $status = $this->initUser( $u, false );
                if ( !$status->isOK() ) {
                        $this->mainLoginForm( $status->getHTML() );
                        return false;
                }
                return $status->value;
        }

        function initUser( $u, $autocreate ) {
                global $wgAuth;

                $status = $u->addToDatabase();
                if ( !$status->isOK() ) {
                        return $status;
                }

                if ( $wgAuth->allowPasswordChange() ) {
                        $u->setPassword( $this->mPassword );
                }

                $u->setEmail( $this->mEmail );
                $u->setRealName( $this->mRealName );
                $u->setToken();

                $wgAuth->initUser( $u, $autocreate );

                if ( $this->mExtUser ) {
                        $this->mExtUser->linkToLocal( $u->getId() );
                        $email = $this->mExtUser->getPref( 'emailaddress' );
                        if ( $email && !$this->mEmail ) {
                                $u->setEmail( $email );
                        }
                }

                $u->setOption( 'rememberpassword', $this->mRemember ? 1 : 0 );
                $u->saveSettings();

                # Update user count
                DeferredUpdates::addUpdate( new SiteStatsUpdate( 0, 0, 0, 0, 1 ) );

                return Status::newGood( $u );
        }

        public function authenticateUserData() {
                global $wgUser, $wgAuth;

                $this->load();

                if ( $this->mUsername == '' ) {
                        return self::NO_NAME;
                }

                // We require a login token to prevent login CSRF
                // Handle part of this before incrementing the throttle so
                // token-less login attempts don't count towards the throttle
                // but wrong-token attempts do.

                // If the user doesn't have a login token yet, set one.
                if ( !self::getLoginToken() ) {
                        self::setLoginToken();
                        return self::NEED_TOKEN;
                }
                // If the user didn't pass a login token, tell them we need one
                if ( !$this->mToken ) {
                        return self::NEED_TOKEN;
                }

                $throttleCount = self::incLoginThrottle( $this->mUsername );
                if ( $throttleCount === true ) {
                        return self::THROTTLED;
                }

                // Validate the login token
                if ( $this->mToken !== self::getLoginToken() ) {
                        return self::WRONG_TOKEN;
                }

                // Load the current user now, and check to see if we're logging in as
                // the same name. This is necessary because loading the current user
                // (say by calling getName()) calls the UserLoadFromSession hook, which
                // potentially creates the user in the database. Until we load $wgUser,
                // checking for user existence using User::newFromName($name)->getId() below
                // will effectively be using stale data.
                if ( $this->getUser()->getName() === $this->mUsername ) {
                        wfDebug( __METHOD__ . ": already logged in as {$this->mUsername}\n" );
                        return self::SUCCESS;
                }

                $this->mExtUser = ExternalUser::newFromName( $this->mUsername );

                # TODO: Allow some magic here for invalid external names, e.g., let the
                # user choose a different wiki name.
                $u = User::newFromName( $this->mUsername );
                if( !( $u instanceof User ) || !User::isUsableName( $u->getName() ) ) {
                        return self::ILLEGAL;
                }

                $isAutoCreated = false;
                if ( 0 == $u->getID() ) {
                        $status = $this->attemptAutoCreate( $u );
                        if ( $status !== self::SUCCESS ) {
                                return $status;
                        } else {
                                $isAutoCreated = true;
                        }
                } else {
                        global $wgExternalAuthType, $wgAutocreatePolicy;
                        if ( $wgExternalAuthType && $wgAutocreatePolicy != 'never'
                        && is_object( $this->mExtUser )
                        && $this->mExtUser->authenticate( $this->mPassword ) ) {
                                # The external user and local user have the same name and
                                # password, so we assume they're the same.
                                $this->mExtUser->linkToLocal( $u->getID() );
                        }

                        $u->load();
                }

                // Give general extensions, such as a captcha, a chance to abort logins
                $abort = self::ABORTED;
                if( !wfRunHooks( 'AbortLogin', array( $u, $this->mPassword, &$abort, &$this->mAbortLoginErrorMsg ) ) ) {
                        return $abort;
                }

                global $wgBlockDisablesLogin;
                if ( !$u->checkPassword( $this->mPassword ) ) {
                        if( $u->checkTemporaryPassword( $this->mPassword ) ) {
                                // The e-mailed temporary password should not be used for actu-
                                // al logins; that's a very sloppy habit, and insecure if an
                                // attacker has a few seconds to click "search" on someone's o-
                                // pen mail reader.
                                //
                                // Allow it to be used only to reset the password a single time
                                // to a new value, which won't be in the user's e-mail ar-
                                // chives.
                                //
                                // For backwards compatibility, we'll still recognize it at the
                                // login form to minimize surprises for people who have been
                                // logging in with a temporary password for some time.
                                //
                                // As a side-effect, we can authenticate the user's e-mail ad-
                                // dress if it's not already done, since the temporary password
                                // was sent via e-mail.
                                if( !$u->isEmailConfirmed() ) {
                                        $u->confirmEmail();
                                        $u->saveSettings();
                                }

                                // At this point we just return an appropriate code/ indicating
                                // that the UI should show a password reset form; bot inter-
                                // faces etc will probably just fail cleanly here.
                                $retval = self::RESET_PASS;
                        } else {
                                $retval = ( $this->mPassword  == '' ) ? self::EMPTY_PASS : self::WRONG_PASS;
                        }
                } elseif ( $wgBlockDisablesLogin && $u->isBlocked() ) {
                        // If we've enabled it, make it so that a blocked user cannot login
                        $retval = self::USER_BLOCKED;
                } else {
                        $wgAuth->updateUser( $u );
                        $wgUser = $u;
                        // This should set it for OutputPage and the Skin
                        // which is needed or the personal links will be
                        // wrong.
                        $this->getContext()->setUser( $u );

                        // Please reset throttle for successful logins, thanks!
                        if ( $throttleCount ) {
                                self::clearLoginThrottle( $this->mUsername );
                        }

                        if ( $isAutoCreated ) {
                                // Must be run after $wgUser is set, for correct new user log
                                wfRunHooks( 'AuthPluginAutoCreate', array( $u ) );
                        }

                        $retval = self::SUCCESS;
                }
                wfRunHooks( 'LoginAuthenticateAudit', array( $u, $this->mPassword, $retval ) );
                return $retval;
        }

        public static function incLoginThrottle( $username ) {
                global $wgPasswordAttemptThrottle, $wgMemc, $wgRequest;
                $username = trim( $username ); // sanity

                $throttleCount = 0;
                if ( is_array( $wgPasswordAttemptThrottle ) ) {
                        $throttleKey = wfMemcKey( 'password-throttle', $wgRequest->getIP(), md5( $username ) );
                        $count = $wgPasswordAttemptThrottle['count'];
                        $period = $wgPasswordAttemptThrottle['seconds'];

                        $throttleCount = $wgMemc->get( $throttleKey );
                        if ( !$throttleCount ) {
                                $wgMemc->add( $throttleKey, 1, $period ); // start counter
                        } elseif ( $throttleCount < $count ) {
                                $wgMemc->incr( $throttleKey );
                        } elseif ( $throttleCount >= $count ) {
                                return true;
                        }
                }

                return $throttleCount;
        }

        public static function clearLoginThrottle( $username ) {
                global $wgMemc, $wgRequest;
                $username = trim( $username ); // sanity

                $throttleKey = wfMemcKey( 'password-throttle', $wgRequest->getIP(), md5( $username ) );
                $wgMemc->delete( $throttleKey );
        }

        function attemptAutoCreate( $user ) {
                global $wgAuth, $wgAutocreatePolicy;

                if ( $this->getUser()->isBlockedFromCreateAccount() ) {
                        wfDebug( __METHOD__ . ": user is blocked from account creation\n" );
                        return self::CREATE_BLOCKED;
                }

                if ( $this->mExtUser ) {
                        # mExtUser is neither null nor false, so use the new ExternalAuth
                        # system.
                        if ( $wgAutocreatePolicy == 'never' ) {
                                return self::NOT_EXISTS;
                        }
                        if ( !$this->mExtUser->authenticate( $this->mPassword ) ) {
                                return self::WRONG_PLUGIN_PASS;
                        }
                } else {
                        # Old AuthPlugin.
                        if ( !$wgAuth->autoCreate() ) {
                                return self::NOT_EXISTS;
                        }
                        if ( !$wgAuth->userExists( $user->getName() ) ) {
                                wfDebug( __METHOD__ . ": user does not exist\n" );
                                return self::NOT_EXISTS;
                        }
                        if ( !$wgAuth->authenticate( $user->getName(), $this->mPassword ) ) {
                                wfDebug( __METHOD__ . ": \$wgAuth->authenticate() returned false, aborting\n" );
                                return self::WRONG_PLUGIN_PASS;
                        }
                }

                $abortError = '';
                if( !wfRunHooks( 'AbortAutoAccount', array( $user, &$abortError ) ) ) {
                        // Hook point to add extra creation throttles and blocks
                        wfDebug( "LoginForm::attemptAutoCreate: a hook blocked creation: $abortError\n" );
                        $this->mAbortLoginErrorMsg = $abortError;
                        return self::ABORTED;
                }

                wfDebug( __METHOD__ . ": creating account\n" );
                $status = $this->initUser( $user, true );

                if ( !$status->isOK() ) {
                        $errors = $status->getErrorsByType( 'error' );
                        $this->mAbortLoginErrorMsg = $errors[0]['message'];
                        return self::ABORTED;
                }

                return self::SUCCESS;
        }

        function processLogin() {
                global $wgMemc, $wgLang;

                switch ( $this->authenticateUserData() ) {
                        case self::SUCCESS:
                                global $wgSecureLogin;
                                # We've verified now, update the real record
                                $user = $this->getUser();
                                if( (bool)$this->mRemember != (bool)$user->getOption( 'rememberpassword' ) ) {
                                        $user->setOption( 'rememberpassword', $this->mRemember ? 1 : 0 );
                                        $user->saveSettings();
                                } else {
                                        $user->invalidateCache();
                                }

                                if( $wgSecureLogin && !$this->mStickHTTPS ) {
                                        $user->setCookies( null, false );
                                } else {
                                        $user->setCookies();
                                }
                                self::clearLoginToken();

                                // Reset the throttle
                                $request = $this->getRequest();
                                $key = wfMemcKey( 'password-throttle', $request->getIP(), md5( $this->mUsername ) );
                                $wgMemc->delete( $key );

                                if( $this->hasSessionCookie() || $this->mSkipCookieCheck ) {
                                        /* Replace the language object to provide user interface in
                                         * correct language immediately on this first page load.
                                         */
                                        $code = $request->getVal( 'uselang', $user->getOption( 'language' ) );
                                        $userLang = Language::factory( $code );
                                        $wgLang = $userLang;
                                        $this->getContext()->setLanguage( $userLang );
                                        $this->successfulLogin();
                                } else {
                                        $this->cookieRedirectCheck( 'login' );
                                }
                                break;

                        case self::NEED_TOKEN:
                                $this->mainLoginForm( $this->msg( 'nocookiesforlogin' )->parse() );
                                break;
                        case self::WRONG_TOKEN:
                                $this->mainLoginForm( $this->msg( 'sessionfailure' )->text() );
                                break;
                        case self::NO_NAME:
                        case self::ILLEGAL:
                                $this->mainLoginForm( $this->msg( 'noname' )->text() );
                                break;
                        case self::WRONG_PLUGIN_PASS:
                                $this->mainLoginForm( $this->msg( 'wrongpassword' )->text() );
                                break;
                        case self::NOT_EXISTS:
                                if( $this->getUser()->isAllowed( 'createaccount' ) ) {
                                        $this->mainLoginForm( $this->msg( 'nosuchuser',
                                                wfEscapeWikiText( $this->mUsername ) )->parse() );
                                } else {
                                        $this->mainLoginForm( $this->msg( 'nosuchusershort',
                                                wfEscapeWikiText( $this->mUsername ) )->text() );
                                }
                                break;
                        case self::WRONG_PASS:
                                $this->mainLoginForm( $this->msg( 'wrongpassword' )->text() );
                                break;
                        case self::EMPTY_PASS:
                                $this->mainLoginForm( $this->msg( 'wrongpasswordempty' )->text() );
                                break;
                        case self::RESET_PASS:
                                $this->resetLoginForm( $this->msg( 'resetpass_announce' )->text() );
                                break;
                        case self::CREATE_BLOCKED:
                                $this->userBlockedMessage( $this->getUser()->mBlock );
                                break;
                        case self::THROTTLED:
                                $this->mainLoginForm( $this->msg( 'login-throttled' )->text() );
                                break;
                        case self::USER_BLOCKED:
                                $this->mainLoginForm( $this->msg( 'login-userblocked',
                                        $this->mUsername )->escaped() );
                                break;
                        case self::ABORTED:
                                $this->mainLoginForm( $this->msg( $this->mAbortLoginErrorMsg )->text() );
                                break;
                        default:
                                throw new MWException( 'Unhandled case value' );
                }
        }

        function resetLoginForm( $error ) {
                $this->getOutput()->addHTML( Xml::element('p', array( 'class' => 'error' ), $error ) );
                $reset = new SpecialChangePassword();
                $reset->setContext( $this->getContext() );
                $reset->execute( null );
        }

        function mailPasswordInternal( $u, $throttle = true, $emailTitle = 'passwordremindertitle', $emailText = 'passwordremindertext' ) {
                global $wgCanonicalServer, $wgScript, $wgNewPasswordExpiry;

                if ( $u->getEmail() == '' ) {
                        return Status::newFatal( 'noemail', $u->getName() );
                }
                $ip = $this->getRequest()->getIP();
                if( !$ip ) {
                        return Status::newFatal( 'badipaddress' );
                }

                $currentUser = $this->getUser();
                wfRunHooks( 'User::mailPasswordInternal', array( &$currentUser, &$ip, &$u ) );

                $np = $u->randomPassword();
                $u->setNewpassword( $np, $throttle );
                $u->saveSettings();
                $userLanguage = $u->getOption( 'language' );
                $m = $this->msg( $emailText, $ip, $u->getName(), $np, '<' . $wgCanonicalServer . $wgScript . '>',
                        round( $wgNewPasswordExpiry / 86400 ) )->inLanguage( $userLanguage )->text();
                $result = $u->sendMail( $this->msg( $emailTitle )->inLanguage( $userLanguage )->text(), $m );

                return $result;
        }


        function successfulLogin() {
                # Run any hooks; display injected HTML if any, else redirect
                $currentUser = $this->getUser();
                $injected_html = '';
                wfRunHooks( 'UserLoginComplete', array( &$currentUser, &$injected_html ) );

                if( $injected_html !== '' ) {
                        $this->displaySuccessfulLogin( 'loginsuccess', $injected_html );
                } else {
                        $this->executeReturnTo( 'successredirect' );
                }
        }

        function successfulCreation() {
                # Run any hooks; display injected HTML
                $currentUser = $this->getUser();
                $injected_html = '';
                $welcome_creation_msg = 'welcomecreation';

                wfRunHooks( 'UserLoginComplete', array( &$currentUser, &$injected_html ) );

                wfRunHooks( 'BeforeWelcomeCreation', array( &$welcome_creation_msg, &$injected_html ) );

                $this->displaySuccessfulLogin( $welcome_creation_msg, $injected_html );
        }

        private function displaySuccessfulLogin( $msgname, $injected_html ) {
                $out = $this->getOutput();
                $out->setPageTitle( $this->msg( 'loginsuccesstitle' ) );
                if( $msgname ){
                        $out->addWikiMsg( $msgname, wfEscapeWikiText( $this->getUser()->getName() ) );
                }

                $out->addHTML( $injected_html );

                $this->executeReturnTo( 'success' );
        }

        function userBlockedMessage( Block $block ) {
                # Let's be nice about this, it's likely that this feature will be used
                # for blocking large numbers of innocent people, e.g. range blocks on
                # schools. Don't blame it on the user. There's a small chance that it
                # really is the user's fault, i.e. the username is blocked and they
                # haven't bothered to log out before trying to create an account to
                # evade it, but we'll leave that to their guilty conscience to figure
                # out.

                $out = $this->getOutput();
                $out->setPageTitle( $this->msg( 'cantcreateaccounttitle' ) );

                $block_reason = $block->mReason;
                if ( strval( $block_reason ) === '' ) {
                        $block_reason = $this->msg( 'blockednoreason' )->text();
                }

                $out->addWikiMsg(
                        'cantcreateaccount-text',
                        $block->getTarget(),
                        $block_reason,
                        $block->getByName()
                );

                $this->executeReturnTo( 'error' );
        }

        private function executeReturnTo( $type ) {
                global $wgRedirectOnLogin, $wgSecureLogin;

                if ( $type != 'error' && $wgRedirectOnLogin !== null ) {
                        $returnTo = $wgRedirectOnLogin;
                        $returnToQuery = array();
                } else {
                        $returnTo = $this->mReturnTo;
                        $returnToQuery = wfCgiToArray( $this->mReturnToQuery );
                }

                $returnToTitle = Title::newFromText( $returnTo );
                if ( !$returnToTitle ) {
                        $returnToTitle = Title::newMainPage();
                }

                if ( $wgSecureLogin && !$this->mStickHTTPS ) {
                        $options = array( 'http' );
                        $proto = PROTO_HTTP;
                } elseif( $wgSecureLogin ) {
                        $options = array( 'https' );
                        $proto = PROTO_HTTPS;
                } else {
                        $options = array();
                        $proto = PROTO_RELATIVE;
                }

                if ( $type == 'successredirect' ) {
                        $redirectUrl = $returnToTitle->getFullURL( $returnToQuery, false, $proto );
                        $this->getOutput()->redirect( $redirectUrl );
                } else {
                        $this->getOutput()->addReturnTo( $returnToTitle, $returnToQuery, null, $options );
                }
        }

        function mainLoginForm( $msg, $msgtype = 'error' ) {
                global $wgEnableEmail, $wgEnableUserEmail;
                global $wgHiddenPrefs, $wgLoginLanguageSelector;
                global $wgAuth, $wgEmailConfirmToEdit, $wgCookieExpiration;
                global $wgSecureLogin, $wgPasswordResetRoutes;

                $titleObj = $this->getTitle();
                $user = $this->getUser();

                if ( $this->mType == 'signup' ) {
                        // Block signup here if in readonly. Keeps user from
                        // going through the process (filling out data, etc)
                        // and being informed later.
                        $permErrors = $titleObj->getUserPermissionsErrors( 'createaccount', $user, true );
                        if ( count( $permErrors ) ) {
                                throw new PermissionsError( 'createaccount', $permErrors );
                        } elseif ( $user->isBlockedFromCreateAccount() ) {
                                $this->userBlockedMessage( $user->isBlockedFromCreateAccount() );
                                return;
                        } elseif ( wfReadOnly() ) {
                                throw new ReadOnlyError;
                        }
                }

                if ( $this->mUsername == '' ) {
                        if ( $user->isLoggedIn() ) {
                                $this->mUsername = $user->getName();
                        } else {
                                $this->mUsername = $this->getRequest()->getCookie( 'UserName' );
                        }
                }

                if ( $this->mType == 'signup' ) {
                        $template = new UsercreateTemplate();
                        $q = 'action=submitlogin&type=signup';
                        $linkq = 'type=login';
                        $linkmsg = 'gotaccount';
                } else {
                        $template = new UserloginTemplate();
                        $q = 'action=submitlogin&type=login';
                        $linkq = 'type=signup';
                        $linkmsg = 'nologin';
                }

                if ( $this->mReturnTo !== '' ) {
                        $returnto = '&returnto=' . wfUrlencode( $this->mReturnTo );
                        if ( $this->mReturnToQuery !== '' ) {
                                $returnto .= '&returntoquery=' .
                                        wfUrlencode( $this->mReturnToQuery );
                        }
                        $q .= $returnto;
                        $linkq .= $returnto;
                }

                # Don't show a "create account" link if the user can't
                if( $this->showCreateOrLoginLink( $user ) ) {
                        # Pass any language selection on to the mode switch link
                        if( $wgLoginLanguageSelector && $this->mLanguage ) {
                                $linkq .= '&uselang=' . $this->mLanguage;
                        }
                        $link = Html::element( 'a', array( 'href' => $titleObj->getLocalURL( $linkq ) ),
                                $this->msg( $linkmsg . 'link' )->text() ); # Calling either 'gotaccountlink' or 'nologinlink'

                        $template->set( 'link', $this->msg( $linkmsg )->rawParams( $link )->parse() );
                } else {
                        $template->set( 'link', '' );
                }

                $resetLink = $this->mType == 'signup'
                        ? null
                        : is_array( $wgPasswordResetRoutes ) && in_array( true, array_values( $wgPasswordResetRoutes ) );

                $template->set( 'header', '' );
                $template->set( 'name', $this->mUsername );
                $template->set( 'password', $this->mPassword );
                $template->set( 'retype', $this->mRetype );
                $template->set( 'email', $this->mEmail );
                $template->set( 'realname', $this->mRealName );
                $template->set( 'domain', $this->mDomain );
                $template->set( 'reason', $this->mReason );

                $template->set( 'action', $titleObj->getLocalURL( $q ) );
                $template->set( 'message', $msg );
                $template->set( 'messagetype', $msgtype );
                $template->set( 'createemail', $wgEnableEmail && $user->isLoggedIn() );
                $template->set( 'userealname', !in_array( 'realname', $wgHiddenPrefs ) );
                $template->set( 'useemail', $wgEnableEmail );
                $template->set( 'emailrequired', $wgEmailConfirmToEdit );
                $template->set( 'emailothers', $wgEnableUserEmail );
                $template->set( 'canreset', $wgAuth->allowPasswordChange() );
                $template->set( 'resetlink', $resetLink );
                $template->set( 'canremember', ( $wgCookieExpiration > 0 ) );
                $template->set( 'usereason', $user->isLoggedIn() );
                $template->set( 'remember', $user->getOption( 'rememberpassword' ) || $this->mRemember );
                $template->set( 'cansecurelogin', ( $wgSecureLogin === true ) );
                $template->set( 'stickHTTPS', $this->mStickHTTPS );

                if ( $this->mType == 'signup' ) {
                        if ( !self::getCreateaccountToken() ) {
                                self::setCreateaccountToken();
                        }
                        $template->set( 'token', self::getCreateaccountToken() );
                } else {
                        if ( !self::getLoginToken() ) {
                                self::setLoginToken();
                        }
                        $template->set( 'token', self::getLoginToken() );
                }

                # Prepare language selection links as needed
                if( $wgLoginLanguageSelector ) {
                        $template->set( 'languages', $this->makeLanguageSelector() );
                        if( $this->mLanguage ) {
                                $template->set( 'uselang', $this->mLanguage );
                        }
                }

                // Use loginend-https for HTTPS requests if it's not blank, loginend otherwise
                // Ditto for signupend
                $usingHTTPS = WebRequest::detectProtocol() == 'https';
                $loginendHTTPS = $this->msg( 'loginend-https' );
                $signupendHTTPS = $this->msg( 'signupend-https' );
                if ( $usingHTTPS && !$loginendHTTPS->isBlank() ) {
                        $template->set( 'loginend', $loginendHTTPS->parse() );
                } else {
                        $template->set( 'loginend', $this->msg( 'loginend' )->parse() );
                }
                if ( $usingHTTPS && !$signupendHTTPS->isBlank() ) {
                        $template->set( 'signupend', $signupendHTTPS->parse() );
                } else {
                        $template->set( 'signupend', $this->msg( 'signupend' )->parse() );
                }

                // Give authentication and captcha plugins a chance to modify the form
                $wgAuth->modifyUITemplate( $template, $this->mType );
                if ( $this->mType == 'signup' ) {
                        wfRunHooks( 'UserCreateForm', array( &$template ) );
                } else {
                        wfRunHooks( 'UserLoginForm', array( &$template ) );
                }

                $out = $this->getOutput();
                $out->disallowUserJs(); // just in case...
                $out->addTemplate( $template );
        }

        function showCreateOrLoginLink( &$user ) {
                if( $this->mType == 'signup' ) {
                        return true;
                } elseif( $user->isAllowed( 'createaccount' ) ) {
                        return true;
                } else {
                        return false;
                }
        }

        function hasSessionCookie() {
                global $wgDisableCookieCheck;
                return $wgDisableCookieCheck ? true : $this->getRequest()->checkSessionCookie();
        }

        public static function getLoginToken() {
                global $wgRequest;
                return $wgRequest->getSessionData( 'wsLoginToken' );
        }

        public static function setLoginToken() {
                global $wgRequest;
                // Generate a token directly instead of using $user->editToken()
                // because the latter reuses $_SESSION['wsEditToken']
                $wgRequest->setSessionData( 'wsLoginToken', MWCryptRand::generateHex( 32 ) );
        }

        public static function clearLoginToken() {
                global $wgRequest;
                $wgRequest->setSessionData( 'wsLoginToken', null );
        }

        public static function getCreateaccountToken() {
                global $wgRequest;
                return $wgRequest->getSessionData( 'wsCreateaccountToken' );
        }

        public static function setCreateaccountToken() {
                global $wgRequest;
                $wgRequest->setSessionData( 'wsCreateaccountToken', MWCryptRand::generateHex( 32 ) );
        }

        public static function clearCreateaccountToken() {
                global $wgRequest;
                $wgRequest->setSessionData( 'wsCreateaccountToken', null );
        }

        function cookieRedirectCheck( $type ) {
                $titleObj = SpecialPage::getTitleFor( 'Userlogin' );
                $query = array( 'wpCookieCheck' => $type );
                if ( $this->mReturnTo !== '' ) {
                        $query['returnto'] = $this->mReturnTo;
                        $query['returntoquery'] = $this->mReturnToQuery;
                }
                $check = $titleObj->getFullURL( $query );

                $this->getOutput()->redirect( $check );
        }

        function onCookieRedirectCheck( $type ) {
                if ( !$this->hasSessionCookie() ) {
                        if ( $type == 'new' ) {
                                $this->mainLoginForm( $this->msg( 'nocookiesnew' )->parse() );
                        } elseif ( $type == 'login' ) {
                                $this->mainLoginForm( $this->msg( 'nocookieslogin' )->parse() );
                        } else {
                                # shouldn't happen
                                $this->mainLoginForm( $this->msg( 'error' )->text() );
                        }
                } else {
                        $this->successfulLogin();
                }
        }

        function throttleHit( $limit ) {
                $this->mainLoginForm( $this->msg( 'acct_creation_throttle_hit' )->numParams( $limit )->parse() );
        }

        function makeLanguageSelector() {
                $msg = $this->msg( 'loginlanguagelinks' )->inContentLanguage();
                if( !$msg->isBlank() ) {
                        $langs = explode( "\n", $msg->text() );
                        $links = array();
                        foreach( $langs as $lang ) {
                                $lang = trim( $lang, '* ' );
                                $parts = explode( '|', $lang );
                                if ( count( $parts ) >= 2 ) {
                                        $links[] = $this->makeLanguageSelectorLink( $parts[0], trim( $parts[1] ) );
                                }
                        }
                        return count( $links ) > 0 ? $this->msg( 'loginlanguagelabel' )->rawParams(
                                $this->getLanguage()->pipeList( $links ) )->escaped() : '';
                } else {
                        return '';
                }
        }

        function makeLanguageSelectorLink( $text, $lang ) {
                if( $this->getLanguage()->getCode() == $lang ) {
                        // no link for currently used language
                        return htmlspecialchars( $text );
                }
                $query = array( 'uselang' => $lang );
                if( $this->mType == 'signup' ) {
                        $query['type'] = 'signup';
                }
                if( $this->mReturnTo !== '' ) {
                        $query['returnto'] = $this->mReturnTo;
                        $query['returntoquery'] = $this->mReturnToQuery;
                }

                $attr = array();
                $targetLanguage = Language::factory( $lang );
                $attr['lang'] = $attr['hreflang'] = $targetLanguage->getHtmlCode();

                return Linker::linkKnown(
                        $this->getTitle(),
                        htmlspecialchars( $text ),
                        $attr,
                        $query
                );
        }
}