* (bug 6029) Improvement to German localisation (de)

[mediawiki.git] / includes / User.php

<?php
/**
 * See user.txt
 *
 * @package MediaWiki
 */

/**
 *
 */
require_once( 'WatchedItem.php' );

# Number of characters in user_token field
define( 'USER_TOKEN_LENGTH', 32 );

# Serialized record version
define( 'MW_USER_VERSION', 3 );

/**
 *
 * @package MediaWiki
 */
class User {
        /*
         * When adding a new private variable, dont forget to add it to __sleep()
         */
        /**@{{
         * @private
         */
        var $mBlockedby;        //!<
        var $mBlockreason;      //!<
        var $mDataLoaded;       //!<
        var $mEmail;            //!<
        var $mEmailAuthenticated; //!<
        var $mGroups;           //!<
        var $mHash;                     //!<
        var $mId;                       //!<
        var $mName;                     //!<
        var $mNewpassword;      //!<
        var $mNewtalk;          //!<
        var $mOptions;          //!<
        var $mPassword;         //!<
        var $mRealName;         //!<
        var $mRegistration;     //!<
        var $mRights;           //!<
        var $mSkin;                     //!<
        var $mToken;            //!<
        var $mTouched;          //!<
        var $mVersion;          //!< serialized version
        /**@}} */

        /** Constructor using User:loadDefaults() */
        function User() {
                $this->loadDefaults();
                $this->mVersion = MW_USER_VERSION;
        }

        /**
         * Static factory method
         * @param string $name Username, validated by Title:newFromText()
         * @param bool $validate Validate username
         * @return User
         * @static
         */
        function newFromName( $name, $validate = true ) {
                # Force usernames to capital
                global $wgContLang;
                $name = $wgContLang->ucfirst( $name );

                # Clean up name according to title rules
                $t = Title::newFromText( $name );
                if( is_null( $t ) ) {
                        return null;
                }

                # Reject various classes of invalid names
                $canonicalName = $t->getText();
                global $wgAuth;
                $canonicalName = $wgAuth->getCanonicalName( $t->getText() );

                if( $validate && !User::isValidUserName( $canonicalName ) ) {
                        return null;
                }

                $u = new User();
                $u->setName( $canonicalName );
                $u->setId( $u->idFromName( $canonicalName ) );
                return $u;
        }

        /**
         * Factory method to fetch whichever use has a given email confirmation code.
         * This code is generated when an account is created or its e-mail address
         * has changed.
         *
         * If the code is invalid or has expired, returns NULL.
         *
         * @param string $code
         * @return User
         * @static
         */
        function newFromConfirmationCode( $code ) {
                $dbr =& wfGetDB( DB_SLAVE );
                $name = $dbr->selectField( 'user', 'user_name', array(
                        'user_email_token' => md5( $code ),
                        'user_email_token_expires > ' . $dbr->addQuotes( $dbr->timestamp() ),
                        ) );
                if( is_string( $name ) ) {
                        return User::newFromName( $name );
                } else {
                        return null;
                }
        }

        /**
         * Serialze sleep function, for better cache efficiency and avoidance of
         * silly "incomplete type" errors when skins are cached. The array should
         * contain names of private variables (see at top of User.php).
         */
        function __sleep() {
                return array(
'mBlockedby',
'mBlockreason',
'mDataLoaded',
'mEmail',
'mEmailAuthenticated',
'mGroups',
'mHash',
'mId',
'mName',
'mNewpassword',
'mNewtalk',
'mOptions',
'mPassword',
'mRealName',
'mRegistration',
'mRights',
'mToken',
'mTouched',
'mVersion',
);
        }

        /**
         * Get username given an id.
         * @param integer $id Database user id
         * @return string Nickname of a user
         * @static
         */
        function whoIs( $id )   {
                $dbr =& wfGetDB( DB_SLAVE );
                return $dbr->selectField( 'user', 'user_name', array( 'user_id' => $id ), 'User::whoIs' );
        }

        /**
         * Get real username given an id.
         * @param integer $id Database user id
         * @return string Realname of a user
         * @static
         */
        function whoIsReal( $id )       {
                $dbr =& wfGetDB( DB_SLAVE );
                return $dbr->selectField( 'user', 'user_real_name', array( 'user_id' => $id ), 'User::whoIsReal' );
        }

        /**
         * Get database id given a user name
         * @param string $name Nickname of a user
         * @return integer|null Database user id (null: if non existent
         * @static
         */
        function idFromName( $name ) {
                $fname = "User::idFromName";

                $nt = Title::newFromText( $name );
                if( is_null( $nt ) ) {
                        # Illegal name
                        return null;
                }
                $dbr =& wfGetDB( DB_SLAVE );
                $s = $dbr->selectRow( 'user', array( 'user_id' ), array( 'user_name' => $nt->getText() ), $fname );

                if ( $s === false ) {
                        return 0;
                } else {
                        return $s->user_id;
                }
        }

        /**
         * does the string match an anonymous IPv4 address?
         *
         * Note: We match \d{1,3}\.\d{1,3}\.\d{1,3}\.xxx as an anonymous IP
         * address because the usemod software would "cloak" anonymous IP
         * addresses like this, if we allowed accounts like this to be created
         * new users could get the old edits of these anonymous users.
         *
         * @bug 3631
         *
         * @static
         * @param string $name Nickname of a user
         * @return bool
         */
        function isIP( $name ) {
                return preg_match("/^\d{1,3}\.\d{1,3}\.\d{1,3}\.(?:xxx|\d{1,3})$/",$name);
                /*return preg_match("/^
                        (?:[01]?\d{1,2}|2(:?[0-4]\d|5[0-5]))\.
                        (?:[01]?\d{1,2}|2(:?[0-4]\d|5[0-5]))\.
                        (?:[01]?\d{1,2}|2(:?[0-4]\d|5[0-5]))\.
                        (?:[01]?\d{1,2}|2(:?[0-4]\d|5[0-5]))
                $/x", $name);*/
        }

        /**
         * Is the input a valid username?
         *
         * Checks if the input is a valid username, we don't want an empty string,
         * an IP address, anything that containins slashes (would mess up subpages),
         * is longer than the maximum allowed username size or doesn't begin with
         * a capital letter.
         *
         * @param string $name
         * @return bool
         * @static
         */
        function isValidUserName( $name ) {
                global $wgContLang, $wgMaxNameChars;

                if ( $name == ''
                || User::isIP( $name )
                || strpos( $name, '/' ) !== false
                || strlen( $name ) > $wgMaxNameChars
                || $name != $wgContLang->ucfirst( $name ) )
                        return false;

                // Ensure that the name can't be misresolved as a different title,
                // such as with extra namespace keys at the start.
                $parsed = Title::newFromText( $name );
                if( is_null( $parsed )
                        || $parsed->getNamespace()
                        || strcmp( $name, $parsed->getPrefixedText() ) )
                        return false;
                
                // Check an additional blacklist of troublemaker characters.
                // Should these be merged into the title char list?
                $unicodeBlacklist = '/[' .
                        '\x{0080}-\x{009f}' . # iso-8859-1 control chars
                        '\x{00a0}' .          # non-breaking space
                        '\x{2000}-\x{200f}' . # various whitespace
                        '\x{2028}-\x{202f}' . # breaks and control chars
                        '\x{3000}' .          # ideographic space
                        '\x{e000}-\x{f8ff}' . # private use
                        ']/u';
                if( preg_match( $unicodeBlacklist, $name ) ) {
                        return false;
                }
                
                return true;
        }

        /**
         * Is the input a valid password?
         *
         * @param string $password
         * @return bool
         * @static
         */
        function isValidPassword( $password ) {
                global $wgMinimalPasswordLength;
                return strlen( $password ) >= $wgMinimalPasswordLength;
        }

        /**
         * Does the string match roughly an email address ?
         *
         * There used to be a regular expression here, it got removed because it
         * rejected valid addresses. Actually just check if there is '@' somewhere
         * in the given address.
         *
         * @todo Check for RFC 2822 compilance
         * @bug 959
         *
         * @param string $addr email address
         * @static
         * @return bool
         */
        function isValidEmailAddr ( $addr ) {
                return ( trim( $addr ) != '' ) &&
                        (false !== strpos( $addr, '@' ) );
        }

        /**
         * Count the number of edits of a user
         *
         * @param int $uid The user ID to check
         * @return int
         */
        function edits( $uid ) {
                $fname = 'User::edits';

                $dbr =& wfGetDB( DB_SLAVE );
                return $dbr->selectField(
                        'revision', 'count(*)',
                        array( 'rev_user' => $uid ),
                        $fname
                );
        }

        /**
         * probably return a random password
         * @return string probably a random password
         * @static
         * @todo Check what is doing really [AV]
         */
        function randomPassword() {
                global $wgMinimalPasswordLength;
                $pwchars = 'ABCDEFGHJKLMNPQRSTUVWXYZabcdefghjkmnpqrstuvwxyz';
                $l = strlen( $pwchars ) - 1;

                $pwlength = max( 7, $wgMinimalPasswordLength );
                $digit = mt_rand(0, $pwlength - 1);
                $np = '';
                for ( $i = 0; $i < $pwlength; $i++ ) {
                        $np .= $i == $digit ? chr( mt_rand(48, 57) ) : $pwchars{ mt_rand(0, $l)};
                }
                return $np;
        }

        /**
         * Set properties to default
         * Used at construction. It will load per language default settings only
         * if we have an available language object.
         */
        function loadDefaults() {
                static $n=0;
                $n++;
                $fname = 'User::loadDefaults' . $n;
                wfProfileIn( $fname );

                global $wgCookiePrefix;
                global $wgNamespacesToBeSearchedDefault;

                $this->mId = 0;
                $this->mNewtalk = -1;
                $this->mName = false;
                $this->mRealName = $this->mEmail = '';
                $this->mEmailAuthenticated = null;
                $this->mPassword = $this->mNewpassword = '';
                $this->mRights = array();
                $this->mGroups = array();
                $this->mOptions = User::getDefaultOptions();

                foreach( $wgNamespacesToBeSearchedDefault as $nsnum => $val ) {
                        $this->mOptions['searchNs'.$nsnum] = $val;
                }
                unset( $this->mSkin );
                $this->mDataLoaded = false;
                $this->mBlockedby = -1; # Unset
                $this->setToken(); # Random
                $this->mHash = false;

                if ( isset( $_COOKIE[$wgCookiePrefix.'LoggedOut'] ) ) {
                        $this->mTouched = wfTimestamp( TS_MW, $_COOKIE[$wgCookiePrefix.'LoggedOut'] );
                }
                else {
                        $this->mTouched = '0'; # Allow any pages to be cached
                }

                $this->mRegistration = wfTimestamp( TS_MW );

                wfProfileOut( $fname );
        }

        /**
         * Combine the language default options with any site-specific options
         * and add the default language variants.
         *
         * @return array
         * @static
         * @private
         */
        function getDefaultOptions() {
                /**
                 * Site defaults will override the global/language defaults
                 */
                global $wgContLang, $wgDefaultUserOptions;
                $defOpt = $wgDefaultUserOptions + $wgContLang->getDefaultUserOptions();

                /**
                 * default language setting
                 */
                $variant = $wgContLang->getPreferredVariant();
                $defOpt['variant'] = $variant;
                $defOpt['language'] = $variant;

                return $defOpt;
        }

        /**
         * Get a given default option value.
         *
         * @param string $opt
         * @return string
         * @static
         * @public
         */
        function getDefaultOption( $opt ) {
                $defOpts = User::getDefaultOptions();
                if( isset( $defOpts[$opt] ) ) {
                        return $defOpts[$opt];
                } else {
                        return '';
                }
        }

        /**
         * Get blocking information
         * @private
         * @param bool $bFromSlave Specify whether to check slave or master. To improve performance,
         *  non-critical checks are done against slaves. Check when actually saving should be done against
         *  master.
         */
        function getBlockedStatus( $bFromSlave = true ) {
                global $wgEnableSorbs, $wgProxyWhitelist;

                if ( -1 != $this->mBlockedby ) {
                        wfDebug( "User::getBlockedStatus: already loaded.\n" );
                        return;
                }

                $fname = 'User::getBlockedStatus';
                wfProfileIn( $fname );
                wfDebug( "$fname: checking...\n" );

                $this->mBlockedby = 0;
                $ip = wfGetIP();

                # User/IP blocking
                $block = new Block();
                $block->fromMaster( !$bFromSlave );
                if ( $block->load( $ip , $this->mId ) ) {
                        wfDebug( "$fname: Found block.\n" );
                        $this->mBlockedby = $block->mBy;
                        $this->mBlockreason = $block->mReason;
                        if ( $this->isLoggedIn() ) {
                                $this->spreadBlock();
                        }
                } else {
                        wfDebug( "$fname: No block.\n" );
                }

                # Proxy blocking
                # FIXME ? proxyunbannable is to deprecate the old isSysop()
                if ( !$this->isAllowed('proxyunbannable') && !in_array( $ip, $wgProxyWhitelist ) ) {

                        # Local list
                        if ( wfIsLocallyBlockedProxy( $ip ) ) {
                                $this->mBlockedby = wfMsg( 'proxyblocker' );
                                $this->mBlockreason = wfMsg( 'proxyblockreason' );
                        }

                        # DNSBL
                        if ( !$this->mBlockedby && $wgEnableSorbs && !$this->getID() ) {
                                if ( $this->inSorbsBlacklist( $ip ) ) {
                                        $this->mBlockedby = wfMsg( 'sorbs' );
                                        $this->mBlockreason = wfMsg( 'sorbsreason' );
                                }
                        }
                }

                # Extensions
                wfRunHooks( 'GetBlockedStatus', array( &$this ) );

                wfProfileOut( $fname );
        }

        function inSorbsBlacklist( $ip ) {
                global $wgEnableSorbs;
                return $wgEnableSorbs &&
                        $this->inDnsBlacklist( $ip, 'http.dnsbl.sorbs.net.' );
        }

        function inOpmBlacklist( $ip ) {
                global $wgEnableOpm;
                return $wgEnableOpm &&
                        $this->inDnsBlacklist( $ip, 'opm.blitzed.org.' );
        }

        function inDnsBlacklist( $ip, $base ) {
                $fname = 'User::inDnsBlacklist';
                wfProfileIn( $fname );

                $found = false;
                $host = '';

                if ( preg_match( '/^(\d{1,3})\.(\d{1,3})\.(\d{1,3})\.(\d{1,3})$/', $ip, $m ) ) {
                        # Make hostname
                        for ( $i=4; $i>=1; $i-- ) {
                                $host .= $m[$i] . '.';
                        }
                        $host .= $base;

                        # Send query
                        $ipList = gethostbynamel( $host );

                        if ( $ipList ) {
                                wfDebug( "Hostname $host is {$ipList[0]}, it's a proxy says $base!\n" );
                                $found = true;
                        } else {
                                wfDebug( "Requested $host, not found in $base.\n" );
                        }
                }

                wfProfileOut( $fname );
                return $found;
        }

        /**
         * Primitive rate limits: enforce maximum actions per time period
         * to put a brake on flooding.
         *
         * Note: when using a shared cache like memcached, IP-address
         * last-hit counters will be shared across wikis.
         *
         * @return bool true if a rate limiter was tripped
         * @public
         */
        function pingLimiter( $action='edit' ) {
                global $wgRateLimits, $wgRateLimitsExcludedGroups;
                if( !isset( $wgRateLimits[$action] ) ) {
                        return false;
                }
                
                # Some groups shouldn't trigger the ping limiter, ever
                foreach( $this->getGroups() as $group ) {
                        if( array_search( $group, $wgRateLimitsExcludedGroups ) !== false )
                                return false;
                }
                
                global $wgMemc, $wgDBname, $wgRateLimitLog;
                $fname = 'User::pingLimiter';
                wfProfileIn( $fname );

                $limits = $wgRateLimits[$action];
                $keys = array();
                $id = $this->getId();
                $ip = wfGetIP();

                if( isset( $limits['anon'] ) && $id == 0 ) {
                        $keys["$wgDBname:limiter:$action:anon"] = $limits['anon'];
                }

                if( isset( $limits['user'] ) && $id != 0 ) {
                        $keys["$wgDBname:limiter:$action:user:$id"] = $limits['user'];
                }
                if( $this->isNewbie() ) {
                        if( isset( $limits['newbie'] ) && $id != 0 ) {
                                $keys["$wgDBname:limiter:$action:user:$id"] = $limits['newbie'];
                        }
                        if( isset( $limits['ip'] ) ) {
                                $keys["mediawiki:limiter:$action:ip:$ip"] = $limits['ip'];
                        }
                        if( isset( $limits['subnet'] ) && preg_match( '/^(\d+\.\d+\.\d+)\.\d+$/', $ip, $matches ) ) {
                                $subnet = $matches[1];
                                $keys["mediawiki:limiter:$action:subnet:$subnet"] = $limits['subnet'];
                        }
                }

                $triggered = false;
                foreach( $keys as $key => $limit ) {
                        list( $max, $period ) = $limit;
                        $summary = "(limit $max in {$period}s)";
                        $count = $wgMemc->get( $key );
                        if( $count ) {
                                if( $count > $max ) {
                                        wfDebug( "$fname: tripped! $key at $count $summary\n" );
                                        if( $wgRateLimitLog ) {
                                                @error_log( wfTimestamp( TS_MW ) . ' ' . $wgDBname . ': ' . $this->getName() . " tripped $key at $count $summary\n", 3, $wgRateLimitLog );
                                        }
                                        $triggered = true;
                                } else {
                                        wfDebug( "$fname: ok. $key at $count $summary\n" );
                                }
                        } else {
                                wfDebug( "$fname: adding record for $key $summary\n" );
                                $wgMemc->add( $key, 1, intval( $period ) );
                        }
                        $wgMemc->incr( $key );
                }

                wfProfileOut( $fname );
                return $triggered;
        }

        /**
         * Check if user is blocked
         * @return bool True if blocked, false otherwise
         */
        function isBlocked( $bFromSlave = true ) { // hacked from false due to horrible probs on site
                wfDebug( "User::isBlocked: enter\n" );
                $this->getBlockedStatus( $bFromSlave );
                return $this->mBlockedby !== 0;
        }

        /**
         * Check if user is blocked from editing a particular article
         */
        function isBlockedFrom( $title, $bFromSlave = false ) {
                global $wgBlockAllowsUTEdit;
                $fname = 'User::isBlockedFrom';
                wfProfileIn( $fname );
                wfDebug( "$fname: enter\n" );

                if ( $wgBlockAllowsUTEdit && $title->getText() === $this->getName() &&
                  $title->getNamespace() == NS_USER_TALK )
                {
                        $blocked = false;
                        wfDebug( "$fname: self-talk page, ignoring any blocks\n" );
                } else {
                        wfDebug( "$fname: asking isBlocked()\n" );
                        $blocked = $this->isBlocked( $bFromSlave );
                }
                wfProfileOut( $fname );
                return $blocked;
        }

        /**
         * Get name of blocker
         * @return string name of blocker
         */
        function blockedBy() {
                $this->getBlockedStatus();
                return $this->mBlockedby;
        }

        /**
         * Get blocking reason
         * @return string Blocking reason
         */
        function blockedFor() {
                $this->getBlockedStatus();
                return $this->mBlockreason;
        }

        /**
         * Initialise php session
         */
        function SetupSession() {
                global $wgSessionsInMemcached, $wgCookiePath, $wgCookieDomain;
                if( $wgSessionsInMemcached ) {
                        require_once( 'MemcachedSessions.php' );
                } elseif( 'files' != ini_get( 'session.save_handler' ) ) {
                        # If it's left on 'user' or another setting from another
                        # application, it will end up failing. Try to recover.
                        ini_set ( 'session.save_handler', 'files' );
                }
                session_set_cookie_params( 0, $wgCookiePath, $wgCookieDomain );
                session_cache_limiter( 'private, must-revalidate' );
                @session_start();
        }

        /**
         * Create a new user object using data from session
         * @static
         */
        function loadFromSession() {
                global $wgMemc, $wgDBname, $wgCookiePrefix;

                if ( isset( $_SESSION['wsUserID'] ) ) {
                        if ( 0 != $_SESSION['wsUserID'] ) {
                                $sId = $_SESSION['wsUserID'];
                        } else {
                                return new User();
                        }
                } else if ( isset( $_COOKIE["{$wgCookiePrefix}UserID"] ) ) {
                        $sId = intval( $_COOKIE["{$wgCookiePrefix}UserID"] );
                        $_SESSION['wsUserID'] = $sId;
                } else {
                        return new User();
                }
                if ( isset( $_SESSION['wsUserName'] ) ) {
                        $sName = $_SESSION['wsUserName'];
                } else if ( isset( $_COOKIE["{$wgCookiePrefix}UserName"] ) ) {
                        $sName = $_COOKIE["{$wgCookiePrefix}UserName"];
                        $_SESSION['wsUserName'] = $sName;
                } else {
                        return new User();
                }

                $passwordCorrect = FALSE;
                $user = $wgMemc->get( $key = "$wgDBname:user:id:$sId" );
                if( !is_object( $user ) || $user->mVersion < MW_USER_VERSION ) {
                        # Expire old serialized objects; they may be corrupt.
                        $user = false;
                }
                if($makenew = !$user) {
                        wfDebug( "User::loadFromSession() unable to load from memcached\n" );
                        $user = new User();
                        $user->mId = $sId;
                        $user->loadFromDatabase();
                } else {
                        wfDebug( "User::loadFromSession() got from cache!\n" );
                }

                if ( isset( $_SESSION['wsToken'] ) ) {
                        $passwordCorrect = $_SESSION['wsToken'] == $user->mToken;
                } else if ( isset( $_COOKIE["{$wgCookiePrefix}Token"] ) ) {
                        $passwordCorrect = $user->mToken == $_COOKIE["{$wgCookiePrefix}Token"];
                } else {
                        return new User(); # Can't log in from session
                }

                if ( ( $sName == $user->mName ) && $passwordCorrect ) {
                        if($makenew) {
                                if($wgMemc->set( $key, $user ))
                                        wfDebug( "User::loadFromSession() successfully saved user\n" );
                                else
                                        wfDebug( "User::loadFromSession() unable to save to memcached\n" );
                        }
                        return $user;
                }
                return new User(); # Can't log in from session
        }

        /**
         * Load a user from the database
         */
        function loadFromDatabase() {
                $fname = "User::loadFromDatabase";

                # Counter-intuitive, breaks various things, use User::setLoaded() if you want to suppress
                # loading in a command line script, don't assume all command line scripts need it like this
                #if ( $this->mDataLoaded || $wgCommandLineMode ) {
                if ( $this->mDataLoaded ) {
                        return;
                }

                # Paranoia
                $this->mId = intval( $this->mId );

                /** Anonymous user */
                if( !$this->mId ) {
                        /** Get rights */
                        $this->mRights = $this->getGroupPermissions( array( '*' ) );
                        $this->mDataLoaded = true;
                        return;
                } # the following stuff is for non-anonymous users only

                $dbr =& wfGetDB( DB_SLAVE );
                $s = $dbr->selectRow( 'user', array( 'user_name','user_password','user_newpassword','user_email',
                  'user_email_authenticated',
                  'user_real_name','user_options','user_touched', 'user_token', 'user_registration' ),
                  array( 'user_id' => $this->mId ), $fname );

                if ( $s !== false ) {
                        $this->mName = $s->user_name;
                        $this->mEmail = $s->user_email;
                        $this->mEmailAuthenticated = wfTimestampOrNull( TS_MW, $s->user_email_authenticated );
                        $this->mRealName = $s->user_real_name;
                        $this->mPassword = $s->user_password;
                        $this->mNewpassword = $s->user_newpassword;
                        $this->decodeOptions( $s->user_options );
                        $this->mTouched = wfTimestamp(TS_MW,$s->user_touched);
                        $this->mToken = $s->user_token;
                        $this->mRegistration = wfTimestampOrNull( TS_MW, $s->user_registration );

                        $res = $dbr->select( 'user_groups',
                                array( 'ug_group' ),
                                array( 'ug_user' => $this->mId ),
                                $fname );
                        $this->mGroups = array();
                        while( $row = $dbr->fetchObject( $res ) ) {
                                $this->mGroups[] = $row->ug_group;
                        }
                        $implicitGroups = array( '*', 'user' );

                        global $wgAutoConfirmAge;
                        $accountAge = time() - wfTimestampOrNull( TS_UNIX, $this->mRegistration );
                        if( $accountAge >= $wgAutoConfirmAge ) {
                                $implicitGroups[] = 'autoconfirmed';
                        }

                        $effectiveGroups = array_merge( $implicitGroups, $this->mGroups );
                        $this->mRights = $this->getGroupPermissions( $effectiveGroups );
                }

                $this->mDataLoaded = true;
        }

        function getID() { return $this->mId; }
        function setID( $v ) {
                $this->mId = $v;
                $this->mDataLoaded = false;
        }

        function getName() {
                $this->loadFromDatabase();
                if ( $this->mName === false ) {
                        $this->mName = wfGetIP();
                }
                return $this->mName;
        }

        function setName( $str ) {
                $this->loadFromDatabase();
                $this->mName = $str;
        }


        /**
         * Return the title dbkey form of the name, for eg user pages.
         * @return string
         * @public
         */
        function getTitleKey() {
                return str_replace( ' ', '_', $this->getName() );
        }

        function getNewtalk() {
                $this->loadFromDatabase();

                # Load the newtalk status if it is unloaded (mNewtalk=-1)
                if( $this->mNewtalk === -1 ) {
                        $this->mNewtalk = false; # reset talk page status

                        # Check memcached separately for anons, who have no
                        # entire User object stored in there.
                        if( !$this->mId ) {
                                global $wgDBname, $wgMemc;
                                $key = "$wgDBname:newtalk:ip:" . $this->getName();
                                $newtalk = $wgMemc->get( $key );
                                if( is_integer( $newtalk ) ) {
                                        $this->mNewtalk = (bool)$newtalk;
                                } else {
                                        $this->mNewtalk = $this->checkNewtalk( 'user_ip', $this->getName() );
                                        $wgMemc->set( $key, $this->mNewtalk, time() ); // + 1800 );
                                }
                        } else {
                                $this->mNewtalk = $this->checkNewtalk( 'user_id', $this->mId );
                        }
                }

                return (bool)$this->mNewtalk;
        }

        /**
         * Return the talk page(s) this user has new messages on.
         */
        function getNewMessageLinks() {
        global  $wgDBname;
                $talks = array();
                if (!wfRunHooks('UserRetrieveNewTalks', array(&$this, &$talks)))
                        return $talks;

                if (!$this->getNewtalk())
                        return array();
                $up = $this->getUserPage();
                $utp = $up->getTalkPage();
                return array(array("wiki" => $wgDBname, "link" => $utp->getLocalURL()));
        }

                
        /**
         * Perform a user_newtalk check on current slaves; if the memcached data
         * is funky we don't want newtalk state to get stuck on save, as that's
         * damn annoying.
         *
         * @param string $field
         * @param mixed $id
         * @return bool
         * @private
         */
        function checkNewtalk( $field, $id ) {
                $fname = 'User::checkNewtalk';
                $dbr =& wfGetDB( DB_SLAVE );
                $ok = $dbr->selectField( 'user_newtalk', $field,
                        array( $field => $id ), $fname );
                return $ok !== false;
        }

        /**
         * Add or update the
         * @param string $field
         * @param mixed $id
         * @private
         */
        function updateNewtalk( $field, $id ) {
                $fname = 'User::updateNewtalk';
                if( $this->checkNewtalk( $field, $id ) ) {
                        wfDebug( "$fname already set ($field, $id), ignoring\n" );
                        return false;
                }
                $dbw =& wfGetDB( DB_MASTER );
                $dbw->insert( 'user_newtalk',
                        array( $field => $id ),
                        $fname,
                        'IGNORE' );
                wfDebug( "$fname: set on ($field, $id)\n" );
                return true;
        }

        /**
         * Clear the new messages flag for the given user
         * @param string $field
         * @param mixed $id
         * @private
         */
        function deleteNewtalk( $field, $id ) {
                $fname = 'User::deleteNewtalk';
                if( !$this->checkNewtalk( $field, $id ) ) {
                        wfDebug( "$fname: already gone ($field, $id), ignoring\n" );
                        return false;
                }
                $dbw =& wfGetDB( DB_MASTER );
                $dbw->delete( 'user_newtalk',
                        array( $field => $id ),
                        $fname );
                wfDebug( "$fname: killed on ($field, $id)\n" );
                return true;
        }

        /**
         * Update the 'You have new messages!' status.
         * @param bool $val
         */
        function setNewtalk( $val ) {
                if( wfReadOnly() ) {
                        return;
                }

                $this->loadFromDatabase();
                $this->mNewtalk = $val;

                $fname = 'User::setNewtalk';

                if( $this->isAnon() ) {
                        $field = 'user_ip';
                        $id = $this->getName();
                } else {
                        $field = 'user_id';
                        $id = $this->getId();
                }

                if( $val ) {
                        $changed = $this->updateNewtalk( $field, $id );
                } else {
                        $changed = $this->deleteNewtalk( $field, $id );
                }

                if( $changed ) {
                        if( $this->isAnon() ) {
                                // Anons have a separate memcached space, since
                                // user records aren't kept for them.
                                global $wgDBname, $wgMemc;
                                $key = "$wgDBname:newtalk:ip:$val";
                                $wgMemc->set( $key, $val ? 1 : 0 );
                        } else {
                                if( $val ) {
                                        // Make sure the user page is watched, so a notification
                                        // will be sent out if enabled.
                                        $this->addWatch( $this->getTalkPage() );
                                }
                        }
                        $this->invalidateCache();
                        $this->saveSettings();
                }
        }

        function invalidateCache() {
                global $wgClockSkewFudge;
                $this->loadFromDatabase();
                $this->mTouched = wfTimestamp(TS_MW, time() + $wgClockSkewFudge );
                # Don't forget to save the options after this or
                # it won't take effect!
        }

        function validateCache( $timestamp ) {
                $this->loadFromDatabase();
                return ($timestamp >= $this->mTouched);
        }

        /**
         * Encrypt a password.
         * It can eventuall salt a password @see User::addSalt()
         * @param string $p clear Password.
         * @return string Encrypted password.
         */
        function encryptPassword( $p ) {
                return wfEncryptPassword( $this->mId, $p );
        }

        # Set the password and reset the random token
        function setPassword( $str ) {
                $this->loadFromDatabase();
                $this->setToken();
                $this->mPassword = $this->encryptPassword( $str );
                $this->mNewpassword = '';
        }

        # Set the random token (used for persistent authentication)
        function setToken( $token = false ) {
                global $wgSecretKey, $wgProxyKey, $wgDBname;
                if ( !$token ) {
                        if ( $wgSecretKey ) {
                                $key = $wgSecretKey;
                        } elseif ( $wgProxyKey ) {
                                $key = $wgProxyKey;
                        } else {
                                $key = microtime();
                        }
                        $this->mToken = md5( $key . mt_rand( 0, 0x7fffffff ) . $wgDBname . $this->mId );
                } else {
                        $this->mToken = $token;
                }
        }


        function setCookiePassword( $str ) {
                $this->loadFromDatabase();
                $this->mCookiePassword = md5( $str );
        }

        function setNewpassword( $str ) {
                $this->loadFromDatabase();
                $this->mNewpassword = $this->encryptPassword( $str );
        }

        function getEmail() {
                $this->loadFromDatabase();
                return $this->mEmail;
        }

        function getEmailAuthenticationTimestamp() {
                $this->loadFromDatabase();
                return $this->mEmailAuthenticated;
        }

        function setEmail( $str ) {
                $this->loadFromDatabase();
                $this->mEmail = $str;
        }

        function getRealName() {
                $this->loadFromDatabase();
                return $this->mRealName;
        }

        function setRealName( $str ) {
                $this->loadFromDatabase();
                $this->mRealName = $str;
        }

        /**
         * @param string $oname The option to check
         * @return string
         */
        function getOption( $oname ) {
                $this->loadFromDatabase();
                if ( array_key_exists( $oname, $this->mOptions ) ) {
                        return trim( $this->mOptions[$oname] );
                } else {
                        return '';
                }
        }

        /**
         * @param string $oname The option to check
         * @return bool False if the option is not selected, true if it is
         */
        function getBoolOption( $oname ) {
                return (bool)$this->getOption( $oname );
        }
        
        /**
         * Get an option as an integer value from the source string.
         * @param string $oname The option to check
         * @param int $default Optional value to return if option is unset/blank.
         * @return int
         */
        function getIntOption( $oname, $default=0 ) {
                $val = $this->getOption( $oname );
                if( $val == '' ) {
                        $val = $default;
                }
                return intval( $val );
        }

        function setOption( $oname, $val ) {
                $this->loadFromDatabase();
                if ( $oname == 'skin' ) {
                        # Clear cached skin, so the new one displays immediately in Special:Preferences
                        unset( $this->mSkin );
                }
                // Filter out any newlines that may have passed through input validation.
                // Newlines are used to separate items in the options blob.
                $val = str_replace( "\r\n", "\n", $val );
                $val = str_replace( "\r", "\n", $val );
                $val = str_replace( "\n", " ", $val );
                $this->mOptions[$oname] = $val;
                $this->invalidateCache();
        }

        function getRights() {
                $this->loadFromDatabase();
                return $this->mRights;
        }

        /**
         * Get the list of explicit group memberships this user has.
         * The implicit * and user groups are not included.
         * @return array of strings
         */
        function getGroups() {
                $this->loadFromDatabase();
                return $this->mGroups;
        }

        /**
         * Get the list of implicit group memberships this user has.
         * This includes all explicit groups, plus 'user' if logged in
         * and '*' for all accounts.
         * @return array of strings
         */
        function getEffectiveGroups() {
                $base = array( '*' );
                if( $this->isLoggedIn() ) {
                        $base[] = 'user';
                }
                return array_merge( $base, $this->getGroups() );
        }

        /**
         * Add the user to the given group.
         * This takes immediate effect.
         * @string $group
         */
        function addGroup( $group ) {
                $dbw =& wfGetDB( DB_MASTER );
                $dbw->insert( 'user_groups',
                        array(
                                'ug_user'  => $this->getID(),
                                'ug_group' => $group,
                        ),
                        'User::addGroup',
                        array( 'IGNORE' ) );

                $this->mGroups = array_merge( $this->mGroups, array( $group ) );
                $this->mRights = User::getGroupPermissions( $this->getEffectiveGroups() );

                $this->invalidateCache();
                $this->saveSettings();
        }

        /**
         * Remove the user from the given group.
         * This takes immediate effect.
         * @string $group
         */
        function removeGroup( $group ) {
                $dbw =& wfGetDB( DB_MASTER );
                $dbw->delete( 'user_groups',
                        array(
                                'ug_user'  => $this->getID(),
                                'ug_group' => $group,
                        ),
                        'User::removeGroup' );

                $this->mGroups = array_diff( $this->mGroups, array( $group ) );
                $this->mRights = User::getGroupPermissions( $this->getEffectiveGroups() );

                $this->invalidateCache();
                $this->saveSettings();
        }


        /**
         * A more legible check for non-anonymousness.
         * Returns true if the user is not an anonymous visitor.
         *
         * @return bool
         */
        function isLoggedIn() {
                return( $this->getID() != 0 );
        }

        /**
         * A more legible check for anonymousness.
         * Returns true if the user is an anonymous visitor.
         *
         * @return bool
         */
        function isAnon() {
                return !$this->isLoggedIn();
        }

        /**
         * Deprecated in 1.6, die in 1.7, to be removed in 1.8
         * @deprecated
         */
        function isSysop() {
                wfDebugDieBacktrace( "Call to deprecated (v1.7) User::isSysop() method\n" );
                #return $this->isAllowed( 'protect' );
        }

        /**
         * Deprecated in 1.6, die in 1.7, to be removed in 1.8
         * @deprecated
         */
        function isDeveloper() {
                wfDebugDieBacktrace( "Call to deprecated (v1.7) User::isDeveloper() method\n" );
                #return $this->isAllowed( 'siteadmin' );
        }

        /**
         * Deprecated in 1.6, die in 1.7, to be removed in 1.8
         * @deprecated
         */
        function isBureaucrat() {
                wfDebugDieBacktrace( "Call to deprecated (v1.7) User::isBureaucrat() method\n" );
                #return $this->isAllowed( 'makesysop' );
        }

        /**
         * Whether the user is a bot
         * @todo need to be migrated to the new user level management sytem
         */
        function isBot() {
                $this->loadFromDatabase();
                return in_array( 'bot', $this->mRights );
        }

        /**
         * Check if user is allowed to access a feature / make an action
         * @param string $action Action to be checked (see $wgAvailableRights in Defines.php for possible actions).
         * @return boolean True: action is allowed, False: action should not be allowed
         */
        function isAllowed($action='') {
                if ( $action === '' )
                        // In the spirit of DWIM
                        return true;

                $this->loadFromDatabase();
                return in_array( $action , $this->mRights );
        }

        /**
         * Load a skin if it doesn't exist or return it
         * @todo FIXME : need to check the old failback system [AV]
         */
        function &getSkin() {
                global $IP, $wgRequest;
                if ( ! isset( $this->mSkin ) ) {
                        $fname = 'User::getSkin';
                        wfProfileIn( $fname );

                        # get the user skin
                        $userSkin = $this->getOption( 'skin' );
                        $userSkin = $wgRequest->getVal('useskin', $userSkin);

                        $this->mSkin =& Skin::newFromKey( $userSkin );
                        wfProfileOut( $fname );
                }
                return $this->mSkin;
        }

        /**#@+
         * @param string $title Article title to look at
         */

        /**
         * Check watched status of an article
         * @return bool True if article is watched
         */
        function isWatched( $title ) {
                $wl = WatchedItem::fromUserTitle( $this, $title );
                return $wl->isWatched();
        }

        /**
         * Watch an article
         */
        function addWatch( $title ) {
                $wl = WatchedItem::fromUserTitle( $this, $title );
                $wl->addWatch();
                $this->invalidateCache();
        }

        /**
         * Stop watching an article
         */
        function removeWatch( $title ) {
                $wl = WatchedItem::fromUserTitle( $this, $title );
                $wl->removeWatch();
                $this->invalidateCache();
        }

        /**
         * Clear the user's notification timestamp for the given title.
         * If e-notif e-mails are on, they will receive notification mails on
         * the next change of the page if it's watched etc.
         */
        function clearNotification( &$title ) {
                global $wgUser, $wgUseEnotif;


                if ($title->getNamespace() == NS_USER_TALK &&
                        $title->getText() == $this->getName() ) {
                        if (!wfRunHooks('UserClearNewTalkNotification', array(&$this)))
                                return;
                        $this->setNewtalk( false );
                }

                if( !$wgUseEnotif ) {
                        return;
                }

                if( $this->isAnon() ) {
                        // Nothing else to do...
                        return;
                }

                // Only update the timestamp if the page is being watched.
                // The query to find out if it is watched is cached both in memcached and per-invocation,
                // and when it does have to be executed, it can be on a slave
                // If this is the user's newtalk page, we always update the timestamp
                if ($title->getNamespace() == NS_USER_TALK &&
                        $title->getText() == $wgUser->getName())
                {
                        $watched = true;
                } elseif ( $this->getID() == $wgUser->getID() ) {
                        $watched = $title->userIsWatching();
                } else {
                        $watched = true;
                }

                // If the page is watched by the user (or may be watched), update the timestamp on any
                // any matching rows
                if ( $watched ) {
                        $dbw =& wfGetDB( DB_MASTER );
                        $success = $dbw->update( 'watchlist',
                                        array( /* SET */
                                                'wl_notificationtimestamp' => NULL
                                        ), array( /* WHERE */
                                                'wl_title' => $title->getDBkey(),
                                                'wl_namespace' => $title->getNamespace(),
                                                'wl_user' => $this->getID()
                                        ), 'User::clearLastVisited'
                        );
                }
        }

        /**#@-*/

        /**
         * Resets all of the given user's page-change notification timestamps.
         * If e-notif e-mails are on, they will receive notification mails on
         * the next change of any watched page.
         *
         * @param int $currentUser user ID number
         * @public
         */
        function clearAllNotifications( $currentUser ) {
                global $wgUseEnotif;
                if ( !$wgUseEnotif ) {
                        $this->setNewtalk( false );
                        return;
                }
                if( $currentUser != 0 )  {

                        $dbw =& wfGetDB( DB_MASTER );
                        $success = $dbw->update( 'watchlist',
                                array( /* SET */
                                        'wl_notificationtimestamp' => 0
                                ), array( /* WHERE */
                                        'wl_user' => $currentUser
                                ), 'UserMailer::clearAll'
                        );

                #       we also need to clear here the "you have new message" notification for the own user_talk page
                #       This is cleared one page view later in Article::viewUpdates();
                }
        }

        /**
         * @private
         * @return string Encoding options
         */
        function encodeOptions() {
                $a = array();
                foreach ( $this->mOptions as $oname => $oval ) {
                        array_push( $a, $oname.'='.$oval );
                }
                $s = implode( "\n", $a );
                return $s;
        }

        /**
         * @private
         */
        function decodeOptions( $str ) {
                $a = explode( "\n", $str );
                foreach ( $a as $s ) {
                        if ( preg_match( "/^(.[^=]*)=(.*)$/", $s, $m ) ) {
                                $this->mOptions[$m[1]] = $m[2];
                        }
                }
        }

        function setCookies() {
                global $wgCookieExpiration, $wgCookiePath, $wgCookieDomain, $wgCookieSecure, $wgCookiePrefix;
                if ( 0 == $this->mId ) return;
                $this->loadFromDatabase();
                $exp = time() + $wgCookieExpiration;

                $_SESSION['wsUserID'] = $this->mId;
                setcookie( $wgCookiePrefix.'UserID', $this->mId, $exp, $wgCookiePath, $wgCookieDomain, $wgCookieSecure );

                $_SESSION['wsUserName'] = $this->getName();
                setcookie( $wgCookiePrefix.'UserName', $this->getName(), $exp, $wgCookiePath, $wgCookieDomain, $wgCookieSecure );

                $_SESSION['wsToken'] = $this->mToken;
                if ( 1 == $this->getOption( 'rememberpassword' ) ) {
                        setcookie( $wgCookiePrefix.'Token', $this->mToken, $exp, $wgCookiePath, $wgCookieDomain, $wgCookieSecure );
                } else {
                        setcookie( $wgCookiePrefix.'Token', '', time() - 3600 );
                }
        }

        /**
         * Logout user
         * It will clean the session cookie
         */
        function logout() {
                global $wgCookiePath, $wgCookieDomain, $wgCookieSecure, $wgCookiePrefix;
                $this->loadDefaults();
                $this->setLoaded( true );

                $_SESSION['wsUserID'] = 0;

                setcookie( $wgCookiePrefix.'UserID', '', time() - 3600, $wgCookiePath, $wgCookieDomain, $wgCookieSecure );
                setcookie( $wgCookiePrefix.'Token', '', time() - 3600, $wgCookiePath, $wgCookieDomain, $wgCookieSecure );

                # Remember when user logged out, to prevent seeing cached pages
                setcookie( $wgCookiePrefix.'LoggedOut', wfTimestampNow(), time() + 86400, $wgCookiePath, $wgCookieDomain, $wgCookieSecure );
        }

        /**
         * Save object settings into database
         */
        function saveSettings() {
                global $wgMemc, $wgDBname;
                $fname = 'User::saveSettings';

                if ( wfReadOnly() ) { return; }
                if ( 0 == $this->mId ) { return; }

                $dbw =& wfGetDB( DB_MASTER );
                $dbw->update( 'user',
                        array( /* SET */
                                'user_name' => $this->mName,
                                'user_password' => $this->mPassword,
                                'user_newpassword' => $this->mNewpassword,
                                'user_real_name' => $this->mRealName,
                                'user_email' => $this->mEmail,
                                'user_email_authenticated' => $dbw->timestampOrNull( $this->mEmailAuthenticated ),
                                'user_options' => $this->encodeOptions(),
                                'user_touched' => $dbw->timestamp($this->mTouched),
                                'user_token' => $this->mToken
                        ), array( /* WHERE */
                                'user_id' => $this->mId
                        ), $fname
                );
                $wgMemc->delete( "$wgDBname:user:id:$this->mId" );
        }


        /**
         * Checks if a user with the given name exists, returns the ID
         */
        function idForName() {
                $fname = 'User::idForName';

                $gotid = 0;
                $s = trim( $this->getName() );
                if ( 0 == strcmp( '', $s ) ) return 0;

                $dbr =& wfGetDB( DB_SLAVE );
                $id = $dbr->selectField( 'user', 'user_id', array( 'user_name' => $s ), $fname );
                if ( $id === false ) {
                        $id = 0;
                }
                return $id;
        }

        /**
         * Add user object to the database
         */
        function addToDatabase() {
                $fname = 'User::addToDatabase';
                $dbw =& wfGetDB( DB_MASTER );
                $seqVal = $dbw->nextSequenceValue( 'user_user_id_seq' );
                $dbw->insert( 'user',
                        array(
                                'user_id' => $seqVal,
                                'user_name' => $this->mName,
                                'user_password' => $this->mPassword,
                                'user_newpassword' => $this->mNewpassword,
                                'user_email' => $this->mEmail,
                                'user_email_authenticated' => $dbw->timestampOrNull( $this->mEmailAuthenticated ),
                                'user_real_name' => $this->mRealName,
                                'user_options' => $this->encodeOptions(),
                                'user_token' => $this->mToken,
                                'user_registration' => $dbw->timestamp( $this->mRegistration ),
                        ), $fname
                );
                $this->mId = $dbw->insertId();
        }

        function spreadBlock() {
                # If the (non-anonymous) user is blocked, this function will block any IP address
                # that they successfully log on from.
                $fname = 'User::spreadBlock';

                wfDebug( "User:spreadBlock()\n" );
                if ( $this->mId == 0 ) {
                        return;
                }

                $userblock = Block::newFromDB( '', $this->mId );
                if ( !$userblock->isValid() ) {
                        return;
                }

                # Check if this IP address is already blocked
                $ipblock = Block::newFromDB( wfGetIP() );
                if ( $ipblock->isValid() ) {
                        # If the user is already blocked. Then check if the autoblock would
                        # excede the user block. If it would excede, then do nothing, else
                        # prolong block time
                        if ($userblock->mExpiry &&
                                ($userblock->mExpiry < Block::getAutoblockExpiry($ipblock->mTimestamp))) {
                                return;
                        }
                        # Just update the timestamp
                        $ipblock->updateTimestamp();
                        return;
                }

                # Make a new block object with the desired properties
                wfDebug( "Autoblocking {$this->mName}@" . wfGetIP() . "\n" );
                $ipblock->mAddress = wfGetIP();
                $ipblock->mUser = 0;
                $ipblock->mBy = $userblock->mBy;
                $ipblock->mReason = wfMsg( 'autoblocker', $this->getName(), $userblock->mReason );
                $ipblock->mTimestamp = wfTimestampNow();
                $ipblock->mAuto = 1;
                # If the user is already blocked with an expiry date, we don't
                # want to pile on top of that!
                if($userblock->mExpiry) {
                        $ipblock->mExpiry = min ( $userblock->mExpiry, Block::getAutoblockExpiry( $ipblock->mTimestamp ));
                } else {
                        $ipblock->mExpiry = Block::getAutoblockExpiry( $ipblock->mTimestamp );
                }

                # Insert it
                $ipblock->insert();

        }

        /**
         * Generate a string which will be different for any combination of
         * user options which would produce different parser output.
         * This will be used as part of the hash key for the parser cache,
         * so users will the same options can share the same cached data
         * safely.
         *
         * Extensions which require it should install 'PageRenderingHash' hook,
         * which will give them a chance to modify this key based on their own
         * settings.
         *
         * @return string
         */
        function getPageRenderingHash() {
                global $wgContLang;
                if( $this->mHash ){
                        return $this->mHash;
                }

                // stubthreshold is only included below for completeness,
                // it will always be 0 when this function is called by parsercache.

                $confstr =        $this->getOption( 'math' );
                $confstr .= '!' . $this->getOption( 'stubthreshold' );
                $confstr .= '!' . $this->getOption( 'date' );
                $confstr .= '!' . ($this->getOption( 'numberheadings' ) ? '1' : '');
                $confstr .= '!' . $this->getOption( 'language' );
                $confstr .= '!' . $this->getOption( 'thumbsize' );
                // add in language specific options, if any
                $extra = $wgContLang->getExtraHashOptions();
                $confstr .= $extra;

                // Give a chance for extensions to modify the hash, if they have
                // extra options or other effects on the parser cache.
                wfRunHooks( 'PageRenderingHash', array( &$confstr ) );

                $this->mHash = $confstr;
                return $confstr;
        }

        function isAllowedToCreateAccount() {
                return $this->isAllowed( 'createaccount' ) && !$this->isBlocked();
        }

        /**
         * Set mDataLoaded, return previous value
         * Use this to prevent DB access in command-line scripts or similar situations
         */
        function setLoaded( $loaded ) {
                return wfSetVar( $this->mDataLoaded, $loaded );
        }

        /**
         * Get this user's personal page title.
         *
         * @return Title
         * @public
         */
        function getUserPage() {
                return Title::makeTitle( NS_USER, $this->getName() );
        }

        /**
         * Get this user's talk page title.
         *
         * @return Title
         * @public
         */
        function getTalkPage() {
                $title = $this->getUserPage();
                return $title->getTalkPage();
        }

        /**
         * @static
         */
        function getMaxID() {
                static $res; // cache

                if ( isset( $res ) )
                        return $res;
                else {
                        $dbr =& wfGetDB( DB_SLAVE );
                        return $res = $dbr->selectField( 'user', 'max(user_id)', false, 'User::getMaxID' );
                }
        }

        /**
         * Determine whether the user is a newbie. Newbies are either
         * anonymous IPs, or the most recently created accounts.
         * @return bool True if it is a newbie.
         */
        function isNewbie() {
                return !$this->isAllowed( 'autoconfirmed' );
        }

        /**
         * Check to see if the given clear-text password is one of the accepted passwords
         * @param string $password User password.
         * @return bool True if the given password is correct otherwise False.
         */
        function checkPassword( $password ) {
                global $wgAuth, $wgMinimalPasswordLength;
                $this->loadFromDatabase();

                // Even though we stop people from creating passwords that
                // are shorter than this, doesn't mean people wont be able
                // to. Certain authentication plugins do NOT want to save
                // domain passwords in a mysql database, so we should
                // check this (incase $wgAuth->strict() is false).
                if( strlen( $password ) < $wgMinimalPasswordLength ) {
                        return false;
                }

                if( $wgAuth->authenticate( $this->getName(), $password ) ) {
                        return true;
                } elseif( $wgAuth->strict() ) {
                        /* Auth plugin doesn't allow local authentication */
                        return false;
                }
                $ep = $this->encryptPassword( $password );
                if ( 0 == strcmp( $ep, $this->mPassword ) ) {
                        return true;
                } elseif ( ($this->mNewpassword != '') && (0 == strcmp( $ep, $this->mNewpassword )) ) {
                        return true;
                } elseif ( function_exists( 'iconv' ) ) {
                        # Some wikis were converted from ISO 8859-1 to UTF-8, the passwords can't be converted
                        # Check for this with iconv
                        $cp1252hash = $this->encryptPassword( iconv( 'UTF-8', 'WINDOWS-1252', $password ) );
                        if ( 0 == strcmp( $cp1252hash, $this->mPassword ) ) {
                                return true;
                        }
                }
                return false;
        }

        /**
         * Initialize (if necessary) and return a session token value
         * which can be used in edit forms to show that the user's
         * login credentials aren't being hijacked with a foreign form
         * submission.
         *
         * @param mixed $salt - Optional function-specific data for hash.
         *                      Use a string or an array of strings.
         * @return string
         * @public
         */
        function editToken( $salt = '' ) {
                if( !isset( $_SESSION['wsEditToken'] ) ) {
                        $token = $this->generateToken();
                        $_SESSION['wsEditToken'] = $token;
                } else {
                        $token = $_SESSION['wsEditToken'];
                }
                if( is_array( $salt ) ) {
                        $salt = implode( '|', $salt );
                }
                return md5( $token . $salt );
        }

        /**
         * Generate a hex-y looking random token for various uses.
         * Could be made more cryptographically sure if someone cares.
         * @return string
         */
        function generateToken( $salt = '' ) {
                $token = dechex( mt_rand() ) . dechex( mt_rand() );
                return md5( $token . $salt );
        }

        /**
         * Check given value against the token value stored in the session.
         * A match should confirm that the form was submitted from the
         * user's own login session, not a form submission from a third-party
         * site.
         *
         * @param string $val - the input value to compare
         * @param string $salt - Optional function-specific data for hash
         * @return bool
         * @public
         */
        function matchEditToken( $val, $salt = '' ) {
                global $wgMemc;
                $sessionToken = $this->editToken( $salt );
                if ( $val != $sessionToken ) {
                        wfDebug( "User::matchEditToken: broken session data\n" );
                }
                return $val == $sessionToken;
        }

        /**
         * Generate a new e-mail confirmation token and send a confirmation
         * mail to the user's given address.
         *
         * @return mixed True on success, a WikiError object on failure.
         */
        function sendConfirmationMail() {
                global $wgContLang;
                $url = $this->confirmationTokenUrl( $expiration );
                return $this->sendMail( wfMsg( 'confirmemail_subject' ),
                        wfMsg( 'confirmemail_body',
                                wfGetIP(),
                                $this->getName(),
                                $url,
                                $wgContLang->timeanddate( $expiration, false ) ) );
        }

        /**
         * Send an e-mail to this user's account. Does not check for
         * confirmed status or validity.
         *
         * @param string $subject
         * @param string $body
         * @param strong $from Optional from address; default $wgPasswordSender will be used otherwise.
         * @return mixed True on success, a WikiError object on failure.
         */
        function sendMail( $subject, $body, $from = null ) {
                if( is_null( $from ) ) {
                        global $wgPasswordSender;
                        $from = $wgPasswordSender;
                }

                require_once( 'UserMailer.php' );
                $to = new MailAddress( $this );
                $sender = new MailAddress( $from );
                $error = userMailer( $to, $sender, $subject, $body );

                if( $error == '' ) {
                        return true;
                } else {
                        return new WikiError( $error );
                }
        }

        /**
         * Generate, store, and return a new e-mail confirmation code.
         * A hash (unsalted since it's used as a key) is stored.
         * @param &$expiration mixed output: accepts the expiration time
         * @return string
         * @private
         */
        function confirmationToken( &$expiration ) {
                $fname = 'User::confirmationToken';

                $now = time();
                $expires = $now + 7 * 24 * 60 * 60;
                $expiration = wfTimestamp( TS_MW, $expires );

                $token = $this->generateToken( $this->mId . $this->mEmail . $expires );
                $hash = md5( $token );

                $dbw =& wfGetDB( DB_MASTER );
                $dbw->update( 'user',
                        array( 'user_email_token'         => $hash,
                               'user_email_token_expires' => $dbw->timestamp( $expires ) ),
                        array( 'user_id'                  => $this->mId ),
                        $fname );

                return $token;
        }

        /**
         * Generate and store a new e-mail confirmation token, and return
         * the URL the user can use to confirm.
         * @param &$expiration mixed output: accepts the expiration time
         * @return string
         * @private
         */
        function confirmationTokenUrl( &$expiration ) {
                $token = $this->confirmationToken( $expiration );
                $title = Title::makeTitle( NS_SPECIAL, 'Confirmemail/' . $token );
                return $title->getFullUrl();
        }

        /**
         * Mark the e-mail address confirmed and save.
         */
        function confirmEmail() {
                $this->loadFromDatabase();
                $this->mEmailAuthenticated = wfTimestampNow();
                $this->saveSettings();
                return true;
        }

        /**
         * Is this user allowed to send e-mails within limits of current
         * site configuration?
         * @return bool
         */
        function canSendEmail() {
                return $this->isEmailConfirmed();
        }

        /**
         * Is this user allowed to receive e-mails within limits of current
         * site configuration?
         * @return bool
         */
        function canReceiveEmail() {
                return $this->canSendEmail() && !$this->getOption( 'disablemail' );
        }

        /**
         * Is this user's e-mail address valid-looking and confirmed within
         * limits of the current site configuration?
         *
         * If $wgEmailAuthentication is on, this may require the user to have
         * confirmed their address by returning a code or using a password
         * sent to the address from the wiki.
         *
         * @return bool
         */
        function isEmailConfirmed() {
                global $wgEmailAuthentication;
                $this->loadFromDatabase();
                $confirmed = true;
                if( wfRunHooks( 'EmailConfirmed', array( &$this, &$confirmed ) ) ) {
                        if( $this->isAnon() )
                                return false;
                        if( !$this->isValidEmailAddr( $this->mEmail ) )
                                return false;
                        if( $wgEmailAuthentication && !$this->getEmailAuthenticationTimestamp() )
                                return false;
                        return true;
                } else {
                        return $confirmed;
                }
        }

        /**
         * @param array $groups list of groups
         * @return array list of permission key names for given groups combined
         * @static
         */
        function getGroupPermissions( $groups ) {
                global $wgGroupPermissions;
                $rights = array();
                foreach( $groups as $group ) {
                        if( isset( $wgGroupPermissions[$group] ) ) {
                                $rights = array_merge( $rights,
                                        array_keys( array_filter( $wgGroupPermissions[$group] ) ) );
                        }
                }
                return $rights;
        }

        /**
         * @param string $group key name
         * @return string localized descriptive name for group, if provided
         * @static
         */
        function getGroupName( $group ) {
                $key = "group-$group";
                $name = wfMsg( $key );
                if( $name == '' || $name == "&lt;$key&gt;" ) {
                        return $group;
                } else {
                        return $name;
                }
        }

        /**
         * @param string $group key name
         * @return string localized descriptive name for member of a group, if provided
         * @static
         */
        function getGroupMember( $group ) {
                $key = "group-$group-member";
                $name = wfMsg( $key );
                if( $name == '' || $name == "&lt;$key&gt;" ) {
                        return $group;
                } else {
                        return $name;
                }
        }


        /**
         * Return the set of defined explicit groups.
         * The * and 'user' groups are not included.
         * @return array
         * @static
         */
        function getAllGroups() {
                global $wgGroupPermissions;
                return array_diff(
                        array_keys( $wgGroupPermissions ),
                        array( '*', 'user', 'autoconfirmed' ) );
        }
        
        /**
         * Get the title of a page describing a particular group
         *
         * @param $group Name of the group
         * @return mixed
         */
        function getGroupPage( $group ) {
                $page = wfMsgForContent( 'grouppage-' . $group );
                if( !wfEmptyMsg( 'grouppage-' . $group, $page ) ) {
                        $title = Title::newFromText( $page );
                        if( is_object( $title ) )
                                return $title;
                }
                return false;
        }
        
        
}

?>