/includes/User.php

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<?php
/**
 * Implements the User class for the %MediaWiki software.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 * http://www.gnu.org/copyleft/gpl.html
 *
 * @file
 */

/**
 * Int Number of characters in user_token field.
 * @ingroup Constants
 */
define( 'USER_TOKEN_LENGTH', 32 );

/**
 * Int Serialized record version.
 * @ingroup Constants
 */
define( 'MW_USER_VERSION', 8 );

/**
 * String Some punctuation to prevent editing from broken text-mangling proxies.
 * @ingroup Constants
 */
define( 'EDIT_TOKEN_SUFFIX', '+\\' );

/**
 * Thrown by User::setPassword() on error.
 * @ingroup Exception
 */
class PasswordError extends MWException {
	// NOP
}

/**
 * The User object encapsulates all of the user-specific settings (user_id,
 * name, rights, password, email address, options, last login time). Client
 * classes use the getXXX() functions to access these fields. These functions
 * do all the work of determining whether the user is logged in,
 * whether the requested option can be satisfied from cookies or
 * whether a database query is needed. Most of the settings needed
 * for rendering normal pages are set in the cookie to minimize use
 * of the database.
 */
class User {
	/**
	 * Global constants made accessible as class constants so that autoloader
	 * magic can be used.
	 */
	const USER_TOKEN_LENGTH = USER_TOKEN_LENGTH;
	const MW_USER_VERSION = MW_USER_VERSION;
	const EDIT_TOKEN_SUFFIX = EDIT_TOKEN_SUFFIX;

	/**
	 * Array of Strings List of member variables which are saved to the
	 * shared cache (memcached). Any operation which changes the
	 * corresponding database fields must call a cache-clearing function.
	 * @showinitializer
	 */
	static $mCacheVars = array(
		// user table
		'mId',
		'mName',
		'mRealName',
		'mPassword',
		'mNewpassword',
		'mNewpassTime',
		'mEmail',
		'mTouched',
		'mToken',
		'mEmailAuthenticated',
		'mEmailToken',
		'mEmailTokenExpires',
		'mRegistration',
		'mEditCount',
		// user_groups table
		'mGroups',
		// user_properties table
		'mOptionOverrides',
	);

	/**
	 * Array of Strings Core rights.
	 * Each of these should have a corresponding message of the form
	 * "right-$right".
	 * @showinitializer
	 */
	static $mCoreRights = array(
		'apihighlimits',
		'autoconfirmed',
		'autopatrol',
		'bigdelete',
		'block',
		'blockemail',
		'bot',
		'browsearchive',
		'createaccount',
		'createpage',
		'createtalk',
		'delete',
		'deletedhistory',
		'deletedtext',
		'deleterevision',
		'edit',
		'editinterface',
		'editusercssjs', #deprecated
		'editusercss',
		'edituserjs',
		'hideuser',
		'import',
		'importupload',
		'ipblock-exempt',
		'markbotedits',
		'mergehistory',
		'minoredit',
		'move',
		'movefile',
		'move-rootuserpages',
		'move-subpages',
		'nominornewtalk',
		'noratelimit',
		'override-export-depth',
		'patrol',
		'protect',
		'proxyunbannable',
		'purge',
		'read',
		'reupload',
		'reupload-shared',
		'rollback',
		'sendemail',
		'siteadmin',
		'suppressionlog',
		'suppressredirect',
		'suppressrevision',
		'unblockself',
		'undelete',
		'unwatchedpages',
		'upload',
		'upload_by_url',
		'userrights',
		'userrights-interwiki',
		'writeapi',
	);
	/**
	 * String Cached results of getAllRights()
	 */
	static $mAllRights = false;

	/** @name Cache variables */
	//@{
	var $mId, $mName, $mRealName, $mPassword, $mNewpassword, $mNewpassTime,
		$mEmail, $mTouched, $mToken, $mEmailAuthenticated,
		$mEmailToken, $mEmailTokenExpires, $mRegistration, $mGroups, $mOptionOverrides,
		$mCookiePassword, $mEditCount, $mAllowUsertalk;
	//@}

	/**
	 * Bool Whether the cache variables have been loaded.
	 */
	//@{
	var $mOptionsLoaded;

	/**
	 * Array with already loaded items or true if all items have been loaded.
	 */
	private $mLoadedItems = array();
	//@}

	/**
	 * String Initialization data source if mLoadedItems!==true. May be one of:
	 *  - 'defaults'   anonymous user initialised from class defaults
	 *  - 'name'       initialise from mName
	 *  - 'id'         initialise from mId
	 *  - 'session'    log in from cookies or session if possible
	 *
	 * Use the User::newFrom*() family of functions to set this.
	 */
	var $mFrom;

	/**
	 * Lazy-initialized variables, invalidated with clearInstanceCache
	 */
	var $mNewtalk, $mDatePreference, $mBlockedby, $mHash, $mRights,
		$mBlockreason, $mEffectiveGroups, $mImplicitGroups, $mFormerGroups, $mBlockedGlobally,
		$mLocked, $mHideName, $mOptions;

	/**
	 * @var WebRequest
	 */
	private $mRequest;

	/**
	 * @var Block
	 */
	var $mBlock;

	/**
	 * @var Block
	 */
	private $mBlockedFromCreateAccount = false;

	static $idCacheByName = array();

	/**
	 * Lightweight constructor for an anonymous user.
	 * Use the User::newFrom* factory functions for other kinds of users.
	 *
	 * @see newFromName()
	 * @see newFromId()
	 * @see newFromConfirmationCode()
	 * @see newFromSession()
	 * @see newFromRow()
	 */
	function __construct() {
		$this->clearInstanceCache( 'defaults' );
	}

	/**
	 * @return String
	 */
	function __toString(){
		return $this->getName();
	}

	/**
	 * Load the user table data for this object from the source given by mFrom.
	 */
	public function load() {
		if ( $this->mLoadedItems === true ) {
			return;
		}
		wfProfileIn( __METHOD__ );

		# Set it now to avoid infinite recursion in accessors
		$this->mLoadedItems = true;

		switch ( $this->mFrom ) {
			case 'defaults':
				$this->loadDefaults();
				break;
			case 'name':
				$this->mId = self::idFromName( $this->mName );
				if ( !$this->mId ) {
					# Nonexistent user placeholder object
					$this->loadDefaults( $this->mName );
				} else {
					$this->loadFromId();
				}
				break;
			case 'id':
				$this->loadFromId();
				break;
			case 'session':
				$this->loadFromSession();
				wfRunHooks( 'UserLoadAfterLoadFromSession', array( $this ) );
				break;
			default:
				throw new MWException( "Unrecognised value for User->mFrom: \"{$this->mFrom}\"" );
		}
		wfProfileOut( __METHOD__ );
	}

	/**
	 * Load user table data, given mId has already been set.
	 * @return Bool false if the ID does not exist, true otherwise
	 */
	public function loadFromId() {
		global $wgMemc;
		if ( $this->mId == 0 ) {
			$this->loadDefaults();
			return false;
		}

		# Try cache
		$key = wfMemcKey( 'user', 'id', $this->mId );
		$data = $wgMemc->get( $key );
		if ( !is_array( $data ) || $data['mVersion'] < MW_USER_VERSION ) {
			# Object is expired, load from DB
			$data = false;
		}

		if ( !$data ) {
			wfDebug( "User: cache miss for user {$this->mId}\n" );
			# Load from DB
			if ( !$this->loadFromDatabase() ) {
				# Can't load from ID, user is anonymous
				return false;
			}
			$this->saveToCache();
		} else {
			wfDebug( "User: got user {$this->mId} from cache\n" );
			# Restore from cache
			foreach ( self::$mCacheVars as $name ) {
				$this->$name = $data[$name];
			}
		}
		return true;
	}

	/**
	 * Save user data to the shared cache
	 */
	public function saveToCache() {
		$this->load();
		$this->loadGroups();
		$this->loadOptions();
		if ( $this->isAnon() ) {
			// Anonymous users are uncached
			return;
		}
		$data = array();
		foreach ( self::$mCacheVars as $name ) {
			$data[$name] = $this->$name;
		}
		$data['mVersion'] = MW_USER_VERSION;
		$key = wfMemcKey( 'user', 'id', $this->mId );
		global $wgMemc;
		$wgMemc->set( $key, $data );
	}

	/** @name newFrom*() static factory methods */
	//@{

	/**
	 * Static factory method for creation from username.
	 *
	 * This is slightly less efficient than newFromId(), so use newFromId() if
	 * you have both an ID and a name handy.
	 *
	 * @param $name String Username, validated by Title::newFromText()
	 * @param $validate String|Bool Validate username. Takes the same parameters as
	 *    User::getCanonicalName(), except that true is accepted as an alias
	 *    for 'valid', for BC.
	 *
	 * @return User object, or false if the username is invalid
	 *    (e.g. if it contains illegal characters or is an IP address). If the
	 *    username is not present in the database, the result will be a user object
	 *    with a name, zero user ID and default settings.
	 */
	public static function newFromName( $name, $validate = 'valid' ) {
		if ( $validate === true ) {
			$validate = 'valid';
		}
		$name = self::getCanonicalName( $name, $validate );
		if ( $name === false ) {
			return false;
		} else {
			# Create unloaded user object
			$u = new User;
			$u->mName = $name;
			$u->mFrom = 'name';
			$u->setItemLoaded( 'name' );
			return $u;
		}
	}

	/**
	 * Static factory method for creation from a given user ID.
	 *
	 * @param $id Int Valid user ID
	 * @return User The corresponding User object
	 */
	public static function newFromId( $id ) {
		$u = new User;
		$u->mId = $id;
		$u->mFrom = 'id';
		$u->setItemLoaded( 'id' );
		return $u;
	}

	/**
	 * Factory method to fetch whichever user 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 $code String Confirmation code
	 * @return User object, or null
	 */
	public static function newFromConfirmationCode( $code ) {
		$dbr = wfGetDB( DB_SLAVE );
		$id = $dbr->selectField( 'user', 'user_id', array(
			'user_email_token' => md5( $code ),
			'user_email_token_expires > ' . $dbr->addQuotes( $dbr->timestamp() ),
			) );
		if( $id !== false ) {
			return User::newFromId( $id );
		} else {
			return null;
		}
	}

	/**
	 * Create a new user object using data from session or cookies. If the
	 * login credentials are invalid, the result is an anonymous user.
	 *
	 * @param $request WebRequest object to use; $wgRequest will be used if
	 *        ommited.
	 * @return User object
	 */
	public static function newFromSession( WebRequest $request = null ) {
		$user = new User;
		$user->mFrom = 'session';
		$user->mRequest = $request;
		return $user;
	}

	/**
	 * Create a new user object from a user row.
	 * The row should have the following fields from the user table in it:
	 * - either user_name or user_id to load further data if needed (or both)
	 * - user_real_name
	 * - all other fields (email, password, etc.)
	 * It is useless to provide the remaining fields if either user_id,
	 * user_name and user_real_name are not provided because the whole row
	 * will be loaded once more from the database when accessing them.
	 *
	 * @param $row Array A row from the user table
	 * @return User
	 */
	public static function newFromRow( $row ) {
		$user = new User;
		$user->loadFromRow( $row );
		return $user;
	}

	//@}

	/**
	 * Get the username corresponding to a given user ID
	 * @param $id Int User ID
	 * @return String|false The corresponding username
	 */
	public static function whoIs( $id ) {
		$dbr = wfGetDB( DB_SLAVE );
		return $dbr->selectField( 'user', 'user_name', array( 'user_id' => $id ), __METHOD__ );
	}

	/**
	 * Get the real name of a user given their user ID
	 *
	 * @param $id Int User ID
	 * @return String|false The corresponding user's real name
	 */
	public static function whoIsReal( $id ) {
		$dbr = wfGetDB( DB_SLAVE );
		return $dbr->selectField( 'user', 'user_real_name', array( 'user_id' => $id ), __METHOD__ );
	}

	/**
	 * Get database id given a user name
	 * @param $name String Username
	 * @return Int|Null The corresponding user's ID, or null if user is nonexistent
	 */
	public static function idFromName( $name ) {
		$nt = Title::makeTitleSafe( NS_USER, $name );
		if( is_null( $nt ) ) {
			# Illegal name
			return null;
		}

		if ( isset( self::$idCacheByName[$name] ) ) {
			return self::$idCacheByName[$name];
		}

		$dbr = wfGetDB( DB_SLAVE );
		$s = $dbr->selectRow( 'user', array( 'user_id' ), array( 'user_name' => $nt->getText() ), __METHOD__ );

		if ( $s === false ) {
			$result = null;
		} else {
			$result = $s->user_id;
		}

		self::$idCacheByName[$name] = $result;

		if ( count( self::$idCacheByName ) > 1000 ) {
			self::$idCacheByName = array();
		}

		return $result;
	}

	/**
	 * Reset the cache used in idFromName(). For use in tests.
	 */
	public static function resetIdByNameCache() {
		self::$idCacheByName = array();
	}

	/**
	 * Does the string match an anonymous IPv4 address?
	 *
	 * This function exists for username validation, in order to reject
	 * usernames which are similar in form to IP addresses. Strings such
	 * as 300.300.300.300 will return true because it looks like an IP
	 * address, despite not being strictly valid.
	 *
	 * 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.
	 *
	 * @param $name String to match
	 * @return Bool
	 */
	public static function isIP( $name ) {
		return preg_match('/^\d{1,3}\.\d{1,3}\.\d{1,3}\.(?:xxx|\d{1,3})$/',$name) || IP::isIPv6($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 $name String to match
	 * @return Bool
	 */
	public static function isValidUserName( $name ) {
		global $wgContLang, $wgMaxNameChars;

		if ( $name == ''
		|| User::isIP( $name )
		|| strpos( $name, '/' ) !== false
		|| strlen( $name ) > $wgMaxNameChars
		|| $name != $wgContLang->ucfirst( $name ) ) {
			wfDebugLog( 'username', __METHOD__ .
				": '$name' invalid due to empty, IP, slash, length, or lowercase" );
			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, $parsed->getPrefixedText() ) ) {
			wfDebugLog( 'username', __METHOD__ .
				": '$name' invalid due to ambiguous prefixes" );
			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, $name ) ) {
			wfDebugLog( 'username', __METHOD__ .
				": '$name' invalid due to blacklisted characters" );
			return false;
		}

		return true;
	}

	/**
	 * Usernames which fail to pass this function will be blocked
	 * from user login and new account registrations, but may be used
	 * internally by batch processes.
	 *
	 * If an account already exists in this form, login will be blocked
	 * by a failure to pass this function.
	 *
	 * @param $name String to match
	 * @return Bool
	 */
	public static function isUsableName( $name ) {
		global $wgReservedUsernames;
		// Must be a valid username, obviously ;)
		if ( !self::isValidUserName( $name ) ) {
			return false;
		}

		static $reservedUsernames = false;
		if ( !$reservedUsernames ) {
			$reservedUsernames = $wgReservedUsernames;
			wfRunHooks( 'UserGetReservedNames', array( &$reservedUsernames ) );
		}

		// Certain names may be reserved for batch processes.
		foreach ( $reservedUsernames as $reserved ) {
			if ( substr( $reserved, 0, 4 ) == 'msg:' ) {
				$reserved = wfMsgForContent( substr( $reserved, 4 ) );
			}
			if ( $reserved == $name ) {
				return false;
			}
		}
		return true;
	}

	/**
	 * Usernames which fail to pass this function will be blocked
	 * from new account registrations, but may be used internally
	 * either by batch processes or by user accounts which have
	 * already been created.
	 *
	 * Additional blacklisting may be added here rather than in
	 * isValidUserName() to avoid disrupting existing accounts.
	 *
	 * @param $name String to match
	 * @return Bool
	 */
	public static function isCreatableName( $name ) {
		global $wgInvalidUsernameCharacters;

		// Ensure that the username isn't longer than 235 bytes, so that
		// (at least for the builtin skins) user javascript and css files
		// will work. (bug 23080)
		if( strlen( $name ) > 235 ) {
			wfDebugLog( 'username', __METHOD__ .
				": '$name' invalid due to length" );
			return false;
		}

		// Preg yells if you try to give it an empty string
		if( $wgInvalidUsernameCharacters !== '' ) {
			if( preg_match( '/[' . preg_quote( $wgInvalidUsernameCharacters, '/' ) . ']/', $name ) ) {
				wfDebugLog( 'username', __METHOD__ .
					": '$name' invalid due to wgInvalidUsernameCharacters" );
				return false;
			}
		}

		return self::isUsableName( $name );
	}

	/**
	 * Is the input a valid password for this user?
	 *
	 * @param $password String Desired password
	 * @return Bool
	 */
	public function isValidPassword( $password ) {
		//simple boolean wrapper for getPasswordValidity
		return $this->getPasswordValidity( $password ) === true;
	}

	/**
	 * Given unvalidated password input, return error message on failure.
	 *
	 * @param $password String Desired password
	 * @return mixed: true on success, string or array of error message on failure
	 */
	public function getPasswordValidity( $password ) {
		global $wgMinimalPasswordLength, $wgContLang;

		static $blockedLogins = array(
			'Useruser' => 'Passpass', 'Useruser1' => 'Passpass1', # r75589
			'Apitestsysop' => 'testpass', 'Apitestuser' => 'testpass' # r75605
		);

		$result = false; //init $result to false for the internal checks

		if( !wfRunHooks( 'isValidPassword', array( $password, &$result, $this ) ) )
			return $result;

		if ( $result === false ) {
			if( strlen( $password ) < $wgMinimalPasswordLength ) {
				return 'passwordtooshort';
			} elseif ( $wgContLang->lc( $password ) == $wgContLang->lc( $this->mName ) ) {
				return 'password-name-match';
			} elseif ( isset( $blockedLogins[ $this->getName() ] ) && $password == $blockedLogins[ $this->getName() ] ) {
				return 'password-login-forbidden';
			} else {
				//it seems weird returning true here, but this is because of the
				//initialization of $result to false above. If the hook is never run or it
				//doesn't modify $result, then we will likely get down into this if with
				//a valid password.
				return true;
			}
		} elseif( $result === true ) {
			return true;
		} else {
			return $result; //the isValidPassword hook set a string $result and returned true
		}
	}

	/**
	 * Does a string look like an e-mail address?
	 *
	 * This validates an email address using an HTML5 specification found at:
	 * http://www.whatwg.org/specs/web-apps/current-work/multipage/states-of-the-type-attribute.html#valid-e-mail-address
	 * Which as of 2011-01-24 says:
	 *
	 *     A valid e-mail address is a string that matches the ABNF production
	 *   1*( atext / "." ) "@" ldh-str *( "." ldh-str ) where atext is defined
	 *   in RFC 5322 section 3.2.3, and ldh-str is defined in RFC 1034 section
	 *   3.5.
	 *
	 * This function is an implementation of the specification as requested in
	 * bug 22449.
	 *
	 * Client-side forms will use the same standard validation rules via JS or
	 * HTML 5 validation; additional restrictions can be enforced server-side
	 * by extensions via the 'isValidEmailAddr' hook.
	 *
	 * Note that this validation doesn't 100% match RFC 2822, but is believed
	 * to be liberal enough for wide use. Some invalid addresses will still
	 * pass validation here.
	 *
	 * @param $addr String E-mail address
	 * @return Bool
	 * @deprecated since 1.18 call Sanitizer::isValidEmail() directly
	 */
	public static function isValidEmailAddr( $addr ) {
		wfDeprecated( __METHOD__, '1.18' );
		return Sanitizer::validateEmail( $addr );
	}

	/**
	 * Given unvalidated user input, return a canonical username, or false if
	 * the username is invalid.
	 * @param $name String User input
	 * @param $validate String|Bool type of validation to use:
	 *                - false        No validation
	 *                - 'valid'      Valid for batch processes
	 *                - 'usable'     Valid for batch processes and login
	 *                - 'creatable'  Valid for batch processes, login and account creation
	 *
	 * @return bool|string
	 */
	public static function getCanonicalName( $name, $validate = 'valid' ) {
		# Force usernames to capital
		global $wgContLang;
		$name = $wgContLang->ucfirst( $name );

		# Reject names containing '#'; these will be cleaned up
		# with title normalisation, but then it's too late to
		# check elsewhere
		if( strpos( $name, '#' ) !== false )
			return false;

		# Clean up name according to title rules
		$t = ( $validate === 'valid' ) ?
			Title::newFromText( $name ) : Title::makeTitle( NS_USER, $name );
		# Check for invalid titles
		if( is_null( $t ) ) {
			return false;
		}

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

		switch ( $validate ) {
			case false:
				break;
			case 'valid':
				if ( !User::isValidUserName( $name ) ) {
					$name = false;
				}
				break;
			case 'usable':
				if ( !User::isUsableName( $name ) ) {
					$name = false;
				}
				break;
			case 'creatable':
				if ( !User::isCreatableName( $name ) ) {
					$name = false;
				}
				break;
			default:
				throw new MWException( 'Invalid parameter value for $validate in ' . __METHOD__ );
		}
		return $name;
	}

	/**
	 * Count the number of edits of a user
	 * @todo It should not be static and some day should be merged as proper member function / deprecated -- domas
	 *
	 * @param $uid Int User ID to check
	 * @return Int the user's edit count
	 */
	public static function edits( $uid ) {
		wfProfileIn( __METHOD__ );
		$dbr = wfGetDB( DB_SLAVE );
		// check if the user_editcount field has been initialized
		$field = $dbr->selectField(
			'user', 'user_editcount',
			array( 'user_id' => $uid ),
			__METHOD__
		);

		if( $field === null ) { // it has not been initialized. do so.
			$dbw = wfGetDB( DB_MASTER );
			$count = $dbr->selectField(
				'revision', 'count(*)',
				array( 'rev_user' => $uid ),
				__METHOD__
			);
			$dbw->update(
				'user',
				array( 'user_editcount' => $count ),
				array( 'user_id' => $uid ),
				__METHOD__
			);
		} else {
			$count = $field;
		}
		wfProfileOut( __METHOD__ );
		return $count;
	}

	/**
	 * Return a random password.
	 *
	 * @return String new random password
	 */
	public static function randomPassword() {
		global $wgMinimalPasswordLength;
		// Decide the final password length based on our min password length, stopping at a minimum of 10 chars
		$length = max( 10, $wgMinimalPasswordLength );
		// Multiply by 1.25 to get the number of hex characters we need
		$length = $length * 1.25;
		// Generate random hex chars
		$hex = MWCryptRand::generateHex( $length );
		// Convert from base 16 to base 32 to get a proper password like string
		return wfBaseConvert( $hex, 16, 32 );
	}

	/**
	 * Set cached properties to default.
	 *
	 * @note This no longer clears uncached lazy-initialised properties;
	 *       the constructor does that instead.
	 *
	 * @param $name string
	 */
	public function loadDefaults( $name = false ) {
		wfProfileIn( __METHOD__ );

		$this->mId = 0;
		$this->mName = $name;
		$this->mRealName = '';
		$this->mPassword = $this->mNewpassword = '';
		$this->mNewpassTime = null;
		$this->mEmail = '';
		$this->mOptionOverrides = null;
		$this->mOptionsLoaded = false;

		$loggedOut = $this->getRequest()->getCookie( 'LoggedOut' );
		if( $loggedOut !== null ) {
			$this->mTouched = wfTimestamp( TS_MW, $loggedOut );
		} else {
			$this->mTouched = '0'; # Allow any pages to be cached
		}

		$this->mToken = null; // Don't run cryptographic functions till we need a token
		$this->mEmailAuthenticated = null;
		$this->mEmailToken = '';
		$this->mEmailTokenExpires = null;
		$this->mRegistration = wfTimestamp( TS_MW );
		$this->mGroups = array();

		wfRunHooks( 'UserLoadDefaults', array( $this, $name ) );

		wfProfileOut( __METHOD__ );
	}

	/**
	 * Return whether an item has been loaded.
	 *
	 * @param $item String: item to check. Current possibilities:
	 *              - id
	 *              - name
	 *              - realname
	 * @param $all String: 'all' to check if the whole object has been loaded
	 *        or any other string to check if only the item is available (e.g.
	 *        for optimisation)
	 * @return Boolean
	 */
	public function isItemLoaded( $item, $all = 'all' ) {
		return ( $this->mLoadedItems === true && $all === 'all' ) ||
			( isset( $this->mLoadedItems[$item] ) && $this->mLoadedItems[$item] === true );
	}

	/**
	 * Set that an item has been loaded
	 *
	 * @param $item String
	 */
	private function setItemLoaded( $item ) {
		if ( is_array( $this->mLoadedItems ) ) {
			$this->mLoadedItems[$item] = true;
		}
	}

	/**
	 * Load user data from the session or login cookie. If there are no valid
	 * credentials, initialises the user as an anonymous user.
	 * @return Bool True if the user is logged in, false otherwise.
	 */
	private function loadFromSession() {
		global $wgExternalAuthType, $wgAutocreatePolicy;

		$result = null;
		wfRunHooks( 'UserLoadFromSession', array( $this, &$result ) );
		if ( $result !== null ) {
			return $result;
		}

		if ( $wgExternalAuthType && $wgAutocreatePolicy == 'view' ) {
			$extUser = ExternalUser::newFromCookie();
			if ( $extUser ) {
				# TODO: Automatically create the user here (or probably a bit
				# lower down, in fact)
			}
		}

		$request = $this->getRequest();

		$cookieId = $request->getCookie( 'UserID' );
		$sessId = $request->getSessionData( 'wsUserID' );

		if ( $cookieId !== null ) {
			$sId = intval( $cookieId );
			if( $sessId !== null && $cookieId != $sessId ) {
				$this->loadDefaults(); // Possible collision!
				wfDebugLog( 'loginSessions', "Session user ID ($sessId) and
					cookie user ID ($sId) don't match!" );
				return false;
			}
			$request->setSessionData( 'wsUserID', $sId );
		} elseif ( $sessId !== null && $sessId != 0 ) {
			$sId = $sessId;
		} else {
			$this->loadDefaults();
			return false;
		}

		if ( $request->getSessionData( 'wsUserName' ) !== null ) {
			$sName = $request->getSessionData( 'wsUserName' );
		} elseif ( $request->getCookie( 'UserName' ) !== null ) {
			$sName = $request->getCookie( 'UserName' );
			$request->setSessionData( 'wsUserName', $sName );
		} else {
			$this->loadDefaults();
			return false;
		}

		$proposedUser = User::newFromId( $sId );
		if ( !$proposedUser->isLoggedIn() ) {
			# Not a valid ID
			$this->loadDefaults();
			return false;
		}

		global $wgBlockDisablesLogin;
		if( $wgBlockDisablesLogin && $proposedUser->isBlocked() ) {
			# User blocked and we've disabled blocked user logins
			$this->loadDefaults();
			return false;
		}

		if ( $request->getSessionData( 'wsToken' ) ) {
			$passwordCorrect = $proposedUser->getToken( false ) === $request->getSessionData( 'wsToken' );
			$from = 'session';
		} elseif ( $request->getCookie( 'Token' ) ) {
			$passwordCorrect = $proposedUser->getToken( false ) === $request->getCookie( 'Token' );
			$from = 'cookie';
		} else {
			# No session or persistent login cookie
			$this->loadDefaults();
			return false;
		}

		if ( ( $sName === $proposedUser->getName() ) && $passwordCorrect ) {
			$this->loadFromUserObject( $proposedUser );
			$request->setSessionData( 'wsToken', $this->mToken );
			wfDebug( "User: logged in from $from\n" );
			return true;
		} else {
			# Invalid credentials
			wfDebug( "User: can't log in from $from, invalid credentials\n" );
			$this->loadDefaults();
			return false;
		}
	}

	/**
	 * Load user and user_group data from the database.
	 * $this->mId must be set, this is how the user is identified.
	 *
	 * @return Bool True if the user exists, false if the user is anonymous
	 */
	public function loadFromDatabase() {
		# Paranoia
		$this->mId = intval( $this->mId );

		/** Anonymous user */
		if( !$this->mId ) {
			$this->loadDefaults();
			return false;
		}

		$dbr = wfGetDB( DB_MASTER );
		$s = $dbr->selectRow( 'user', '*', array( 'user_id' => $this->mId ), __METHOD__ );

		wfRunHooks( 'UserLoadFromDatabase', array( $this, &$s ) );

		if ( $s !== false ) {
			# Initialise user table data
			$this->loadFromRow( $s );
			$this->mGroups = null; // deferred
			$this->getEditCount(); // revalidation for nulls
			return true;
		} else {
			# Invalid user_id
			$this->mId = 0;
			$this->loadDefaults();
			return false;
		}
	}

	/**
	 * Initialize this object from a row from the user table.
	 *
	 * @param $row Array Row from the user table to load.
	 */
	public function loadFromRow( $row ) {
		$all = true;

		$this->mGroups = null; // deferred

		if ( isset( $row->user_name ) ) {
			$this->mName = $row->user_name;
			$this->mFrom = 'name';
			$this->setItemLoaded( 'name' );
		} else {
			$all = false;
		}

		if ( isset( $row->user_real_name ) ) {
			$this->mRealName = $row->user_real_name;
			$this->setItemLoaded( 'realname' );
		} else {
			$all = false;
		}

		if ( isset( $row->user_id ) ) {
			$this->mId = intval( $row->user_id );
			$this->mFrom = 'id';
			$this->setItemLoaded( 'id' );
		} else {
			$all = false;
		}

		if ( isset( $row->user_editcount ) ) {
			$this->mEditCount = $row->user_editcount;
		} else {
			$all = false;
		}

		if ( isset( $row->user_password ) ) {
			$this->mPassword = $row->user_password;
			$this->mNewpassword = $row->user_newpassword;
			$this->mNewpassTime = wfTimestampOrNull( TS_MW, $row->user_newpass_time );
			$this->mEmail = $row->user_email;
			if ( isset( $row->user_options ) ) {
				$this->decodeOptions( $row->user_options );
			}
			$this->mTouched = wfTimestamp( TS_MW, $row->user_touched );
			$this->mToken = $row->user_token;
			if ( $this->mToken == '' ) {
				$this->mToken = null;
			}
			$this->mEmailAuthenticated = wfTimestampOrNull( TS_MW, $row->user_email_authenticated );
			$this->mEmailToken = $row->user_email_token;
			$this->mEmailTokenExpires = wfTimestampOrNull( TS_MW, $row->user_email_token_expires );
			$this->mRegistration = wfTimestampOrNull( TS_MW, $row->user_registration );
		} else {
			$all = false;
		}

		if ( $all ) {
			$this->mLoadedItems = true;
		}
	}

	/**
	 * Load the data for this user object from another user object.
	 *
	 * @param $user User
	 */
	protected function loadFromUserObject( $user ) {
		$user->load();
		$user->loadGroups();
		$user->loadOptions();
		foreach ( self::$mCacheVars as $var ) {
			$this->$var = $user->$var;
		}
	}

	/**
	 * Load the groups from the database if they aren't already loaded.
	 */
	private function loadGroups() {
		if ( is_null( $this->mGroups ) ) {
			$dbr = wfGetDB( DB_MASTER );
			$res = $dbr->select( 'user_groups',
				array( 'ug_group' ),
				array( 'ug_user' => $this->mId ),
				__METHOD__ );
			$this->mGroups = array();
			foreach ( $res as $row ) {
				$this->mGroups[] = $row->ug_group;
			}
		}
	}

	/**
	 * Add the user to the group if he/she meets given criteria.
	 *
	 * Contrary to autopromotion by \ref $wgAutopromote, the group will be
	 *   possible to remove manually via Special:UserRights. In such case it
	 *   will not be re-added automatically. The user will also not lose the
	 *   group if they no longer meet the criteria.
	 *
	 * @param $event String key in $wgAutopromoteOnce (each one has groups/criteria)
	 *
	 * @return array Array of groups the user has been promoted to.
	 *
	 * @see $wgAutopromoteOnce
	 */
	public function addAutopromoteOnceGroups( $event ) {
		global $wgAutopromoteOnceLogInRC;

		$toPromote = array();
		if ( $this->getId() ) {
			$toPromote = Autopromote::getAutopromoteOnceGroups( $this, $event );
			if ( count( $toPromote ) ) {
				$oldGroups = $this->getGroups(); // previous groups
				foreach ( $toPromote as $group ) {
					$this->addGroup( $group );
				}
				$newGroups = array_merge( $oldGroups, $toPromote ); // all groups

				$log = new LogPage( 'rights', $wgAutopromoteOnceLogInRC /* in RC? */ );
				$log->addEntry( 'autopromote',
					$this->getUserPage(),
					'', // no comment
					// These group names are "list to texted"-ed in class LogPage.
					array( implode( ', ', $oldGroups ), implode( ', ', $newGroups ) )
				);
			}
		}
		return $toPromote;
	}

	/**
	 * Clear various cached data stored in this object.
	 * @param $reloadFrom bool|String Reload user and user_groups table data from a
	 *   given source. May be "name", "id", "defaults", "session", or false for
	 *   no reload.
	 */
	public function clearInstanceCache( $reloadFrom = false ) {
		$this->mNewtalk = -1;
		$this->mDatePreference = null;
		$this->mBlockedby = -1; # Unset
		$this->mHash = false;
		$this->mRights = null;
		$this->mEffectiveGroups = null;
		$this->mImplicitGroups = null;
		$this->mOptions = null;

		if ( $reloadFrom ) {
			$this->mLoadedItems = array();
			$this->mFrom = $reloadFrom;
		}
	}

	/**
	 * Combine the language default options with any site-specific options
	 * and add the default language variants.
	 *
	 * @return Array of String options
	 */
	public static function getDefaultOptions() {
		global $wgNamespacesToBeSearchedDefault, $wgDefaultUserOptions, $wgContLang, $wgDefaultSkin;

		$defOpt = $wgDefaultUserOptions;
		# default language setting
		$variant = $wgContLang->getDefaultVariant();
		$defOpt['variant'] = $variant;
		$defOpt['language'] = $variant;
		foreach( SearchEngine::searchableNamespaces() as $nsnum => $nsname ) {
			$defOpt['searchNs'.$nsnum] = !empty( $wgNamespacesToBeSearchedDefault[$nsnum] );
		}
		$defOpt['skin'] = $wgDefaultSkin;

		// FIXME: Ideally we'd cache the results of this function so the hook is only run once,
		// but that breaks the parser tests because they rely on being able to change $wgContLang
		// mid-request and see that change reflected in the return value of this function.
		// Which is insane and would never happen during normal MW operation, but is also not
		// likely to get fixed unless and until we context-ify everything.
		// See also https://www.mediawiki.org/wiki/Special:Code/MediaWiki/101488#c25275
		wfRunHooks( 'UserGetDefaultOptions', array( &$defOpt ) );

		return $defOpt;
	}

	/**
	 * Get a given default option value.
	 *
	 * @param $opt String Name of option to retrieve
	 * @return String Default option value
	 */
	public static function getDefaultOption( $opt ) {
		$defOpts = self::getDefaultOptions();
		if( isset( $defOpts[$opt] ) ) {
			return $defOpts[$opt];
		} else {
			return null;
		}
	}


	/**
	 * Get blocking information
	 * @param $bFromSlave Bool Whether to check the slave database first. To
	 *                    improve performance, non-critical checks are done
	 *                    against slaves. Check when actually saving should be
	 *                    done against master.
	 */
	private function getBlockedStatus( $bFromSlave = true ) {
		global $wgProxyWhitelist, $wgUser;

		if ( -1 != $this->mBlockedby ) {
			return;
		}

		wfProfileIn( __METHOD__ );
		wfDebug( __METHOD__.": checking...\n" );

		// Initialize data...
		// Otherwise something ends up stomping on $this->mBlockedby when
		// things get lazy-loaded later, causing false positive block hits
		// due to -1 !== 0. Probably session-related... Nothing should be
		// overwriting mBlockedby, surely?
		$this->load();

		# We only need to worry about passing the IP address to the Block generator if the
		# user is not immune to autoblocks/hardblocks, and they are the current user so we
		# know which IP address they're actually coming from
		if ( !$this->isAllowed( 'ipblock-exempt' ) && $this->getID() == $wgUser->getID() ) {
			$ip = $this->getRequest()->getIP();
		} else {
			$ip = null;
		}

		# User/IP blocking
		$block = Block::newFromTarget( $this->getName(), $ip, !$bFromSlave );

		# Proxy blocking
		if ( !$block instanceof Block && $ip !== null && !$this->isAllowed( 'proxyunbannable' )
			&& !in_array( $ip, $wgProxyWhitelist ) ) 
		{
			# Local list
			if ( self::isLocallyBlockedProxy( $ip ) ) {
				$block = new Block;
				$block->setBlocker( wfMsg( 'proxyblocker' ) );
				$block->mReason = wfMsg( 'proxyblockreason' );
				$block->setTarget( $ip );
			} elseif ( $this->isAnon() && $this->isDnsBlacklisted( $ip ) ) {
				$block = new Block;
				$block->setBlocker( wfMsg( 'sorbs' ) );
				$block->mReason = wfMsg( 'sorbsreason' );
				$block->setTarget( $ip );
			}
		}

		if ( $block instanceof Block ) {
			wfDebug( __METHOD__ . ": Found block.\n" );
			$this->mBlock = $block;
			$this->mBlockedby = $block->getByName();
			$this->mBlockreason = $block->mReason;
			$this->mHideName = $block->mHideName;
			$this->mAllowUsertalk = !$block->prevents( 'editownusertalk' );
		} else {
			$this->mBlockedby = '';
			$this->mHideName = 0;
			$this->mAllowUsertalk = false;
		}

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

		wfProfileOut( __METHOD__ );
	}

	/**
	 * Whether the given IP is in a DNS blacklist.
	 *
	 * @param $ip String IP to check
	 * @param $checkWhitelist Bool: whether to check the whitelist first
	 * @return Bool True if blacklisted.
	 */
	public function isDnsBlacklisted( $ip, $checkWhitelist = false ) {
		global $wgEnableSorbs, $wgEnableDnsBlacklist,
			$wgSorbsUrl, $wgDnsBlacklistUrls, $wgProxyWhitelist;

		if ( !$wgEnableDnsBlacklist && !$wgEnableSorbs )
			return false;

		if ( $checkWhitelist && in_array( $ip, $wgProxyWhitelist ) )
			return false;

		$urls = array_merge( $wgDnsBlacklistUrls, (array)$wgSorbsUrl );
		return $this->inDnsBlacklist( $ip, $urls );
	}

	/**
	 * Whether the given IP is in a given DNS blacklist.
	 *
	 * @param $ip String IP to check
	 * @param $bases String|Array of Strings: URL of the DNS blacklist
	 * @return Bool True if blacklisted.
	 */
	public function inDnsBlacklist( $ip, $bases ) {
		wfProfileIn( __METHOD__ );

		$found = false;
		// @todo FIXME: IPv6 ???  (http://bugs.php.net/bug.php?id=33170)
		if( IP::isIPv4( $ip ) ) {
			# Reverse IP, bug 21255
			$ipReversed = implode( '.', array_reverse( explode( '.', $ip ) ) );

			foreach( (array)$bases as $base ) {
				# Make hostname
				# If we have an access key, use that too (ProjectHoneypot, etc.)
				if( is_array( $base ) ) {
					if( count( $base ) >= 2 ) {
						# Access key is 1, base URL is 0
						$host = "{$base[1]}.$ipReversed.{$base[0]}";
					} else {
						$host = "$ipReversed.{$base[0]}";
					}
				} else {
					$host = "$ipReversed.$base";
				}

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

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

		wfProfileOut( __METHOD__ );
		return $found;
	}

	/**
	 * Check if an IP address is in the local proxy list
	 *
	 * @param $ip string
	 *
	 * @return bool
	 */
	public static function isLocallyBlockedProxy( $ip ) {
		global $wgProxyList;

		if ( !$wgProxyList ) {
			return false;
		}
		wfProfileIn( __METHOD__ );

		if ( !is_array( $wgProxyList ) ) {
			# Load from the specified file
			$wgProxyList = array_map( 'trim', file( $wgProxyList ) );
		}

		if ( !is_array( $wgProxyList ) ) {
			$ret = false;
		} elseif ( array_search( $ip, $wgProxyList ) !== false ) {
			$ret = true;
		} elseif ( array_key_exists( $ip, $wgProxyList ) ) {
			# Old-style flipped proxy list
			$ret = true;
		} else {
			$ret = false;
		}
		wfProfileOut( __METHOD__ );
		return $ret;
	}

	/**
	 * Is this user subject to rate limiting?
	 *
	 * @return Bool True if rate limited
	 */
	public function isPingLimitable() {
		global $wgRateLimitsExcludedIPs;
		if( in_array( $this->getRequest()->getIP(), $wgRateLimitsExcludedIPs ) ) {
			// No other good way currently to disable rate limits
			// for specific IPs. :P
			// But this is a crappy hack and should die.
			return false;
		}
		return !$this->isAllowed('noratelimit');
	}

	/**
	 * 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.
	 *
	 * @param $action String Action to enforce; 'edit' if unspecified
	 * @return Bool True if a rate limiter was tripped
	 */
	public function pingLimiter( $action = 'edit' ) {
		# Call the 'PingLimiter' hook
		$result = false;
		if( !wfRunHooks( 'PingLimiter', array( &$this, $action, $result ) ) ) {
			return $result;
		}

		global $wgRateLimits;
		if( !isset( $wgRateLimits[$action] ) ) {
			return false;
		}

		# Some groups shouldn't trigger the ping limiter, ever
		if( !$this->isPingLimitable() )
			return false;

		global $wgMemc, $wgRateLimitLog;
		wfProfileIn( __METHOD__ );

		$limits = $wgRateLimits[$action];
		$keys = array();
		$id = $this->getId();
		$ip = $this->getRequest()->getIP();
		$userLimit = false;

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

		if( isset( $limits['user'] ) && $id != 0 ) {
			$userLimit = $limits['user'];
		}
		if( $this->isNewbie() ) {
			if( isset( $limits['newbie'] ) && $id != 0 ) {
				$keys[wfMemcKey( 'limiter', $action, 'user', $id )] = $limits['newbie'];
			}
			if( isset( $limits['ip'] ) ) {
				$keys["mediawiki:limiter:$action:ip:$ip"] = $limits['ip'];
			}
			$matches = array();
			if( isset( $limits['subnet'] ) && preg_match( '/^(\d+\.\d+\.\d+)\.\d+$/', $ip, $matches ) ) {
				$subnet = $matches[1];
				$keys["mediawiki:limiter:$action:subnet:$subnet"] = $limits['subnet'];
			}
		}
		// Check for group-specific permissions
		// If more than one group applies, use the group with the highest limit
		foreach ( $this->getGroups() as $group ) {
			if ( isset( $limits[$group] ) ) {
				if ( $userLimit === false || $limits[$group] > $userLimit ) {
					$userLimit = $limits[$group];
				}
			}
		}
		// Set the user limit key
		if ( $userLimit !== false ) {
			wfDebug( __METHOD__ . ": effective user limit: $userLimit\n" );
			$keys[ wfMemcKey( 'limiter', $action, 'user', $id ) ] = $userLimit;
		}

		$triggered = false;
		foreach( $keys as $key => $limit ) {
			list( $max, $period ) = $limit;
			$summary = "(limit $max in {$period}s)";
			$count = $wgMemc->get( $key );
			// Already pinged?
			if( $count ) {
				if( $count > $max ) {
					wfDebug( __METHOD__ . ": tripped! $key at $count $summary\n" );
					if( $wgRateLimitLog ) {
						wfSuppressWarnings();
						file_put_contents( $wgRateLimitLog, wfTimestamp( TS_MW ) . ' ' . wfWikiID() . ': ' . $this->getName() . " tripped $key at $count $summary\n", FILE_APPEND );
						wfRestoreWarnings();
					}
					$triggered = true;
				} else {
					wfDebug( __METHOD__ . ": ok. $key at $count $summary\n" );
				}
			} else {
				wfDebug( __METHOD__ . ": adding record for $key $summary\n" );
				$wgMemc->add( $key, 0, intval( $period ) ); // first ping
			}
			$wgMemc->incr( $key );
		}

		wfProfileOut( __METHOD__ );
		return $triggered;
	}

	/**
	 * Check if user is blocked
	 *
	 * @param $bFromSlave Bool Whether to check the slave database instead of the master
	 * @return Bool True if blocked, false otherwise
	 */
	public function isBlocked( $bFromSlave = true ) { // hacked from false due to horrible probs on site
		return $this->getBlock( $bFromSlave ) instanceof Block && $this->getBlock()->prevents( 'edit' );
	}

	/**
	 * Get the block affecting the user, or null if the user is not blocked
	 *
	 * @param $bFromSlave Bool Whether to check the slave database instead of the master
	 * @return Block|null
	 */
	public function getBlock( $bFromSlave = true ){
		$this->getBlockedStatus( $bFromSlave );
		return $this->mBlock instanceof Block ? $this->mBlock : null;
	}

	/**
	 * Check if user is blocked from editing a particular article
	 *
	 * @param $title Title to check
	 * @param $bFromSlave Bool whether to check the slave database instead of the master
	 * @return Bool
	 */
	function isBlockedFrom( $title, $bFromSlave = false ) {
		global $wgBlockAllowsUTEdit;
		wfProfileIn( __METHOD__ );

		$blocked = $this->isBlocked( $bFromSlave );
		$allowUsertalk = ( $wgBlockAllowsUTEdit ? $this->mAllowUsertalk : false );
		# If a user's name is suppressed, they cannot make edits anywhere
		if ( !$this->mHideName && $allowUsertalk && $title->getText() === $this->getName() &&
		  $title->getNamespace() == NS_USER_TALK ) {
			$blocked = false;
			wfDebug( __METHOD__ . ": self-talk page, ignoring any blocks\n" );
		}

		wfRunHooks( 'UserIsBlockedFrom', array( $this, $title, &$blocked, &$allowUsertalk ) );

		wfProfileOut( __METHOD__ );
		return $blocked;
	}

	/**
	 * If user is blocked, return the name of the user who placed the block
	 * @return String name of blocker
	 */
	public function blockedBy() {
		$this->getBlockedStatus();
		return $this->mBlockedby;
	}

	/**
	 * If user is blocked, return the specified reason for the block
	 * @return String Blocking reason
	 */
	public function blockedFor() {
		$this->getBlockedStatus();
		return $this->mBlockreason;
	}

	/**
	 * If user is blocked, return the ID for the block
	 * @return Int Block ID
	 */
	public function getBlockId() {
		$this->getBlockedStatus();
		return ( $this->mBlock ? $this->mBlock->getId() : false );
	}

	/**
	 * Check if user is blocked on all wikis.
	 * Do not use for actual edit permission checks!
	 * This is intented for quick UI checks.
	 *
	 * @param $ip String IP address, uses current client if none given
	 * @return Bool True if blocked, false otherwise
	 */
	public function isBlockedGlobally( $ip = '' ) {
		if( $this->mBlockedGlobally !== null ) {
			return $this->mBlockedGlobally;
		}
		// User is already an IP?
		if( IP::isIPAddress( $this->getName() ) ) {
			$ip = $this->getName();
		} elseif( !$ip ) {
			$ip = $this->getRequest()->getIP();
		}
		$blocked = false;
		wfRunHooks( 'UserIsBlockedGlobally', array( &$this, $ip, &$blocked ) );
		$this->mBlockedGlobally = (bool)$blocked;
		return $this->mBlockedGlobally;
	}

	/**
	 * Check if user account is locked
	 *
	 * @return Bool True if locked, false otherwise
	 */
	public function isLocked() {
		if( $this->mLocked !== null ) {
			return $this->mLocked;
		}
		global $wgAuth;
		$authUser = $wgAuth->getUserInstance( $this );
		$this->mLocked = (bool)$authUser->isLocked();
		return $this->mLocked;
	}

	/**
	 * Check if user account is hidden
	 *
	 * @return Bool True if hidden, false otherwise
	 */
	public function isHidden() {
		if( $this->mHideName !== null ) {
			return $this->mHideName;
		}
		$this->getBlockedStatus();
		if( !$this->mHideName ) {
			global $wgAuth;
			$authUser = $wgAuth->getUserInstance( $this );
			$this->mHideName = (bool)$authUser->isHidden();
		}
		return $this->mHideName;
	}

	/**
	 * Get the user's ID.
	 * @return Int The user's ID; 0 if the user is anonymous or nonexistent
	 */
	public function getId() {
		if( $this->mId === null && $this->mName !== null
		&& User::isIP( $this->mName ) ) {
			// Special case, we know the user is anonymous
			return 0;
		} elseif( !$this->isItemLoaded( 'id' ) ) {
			// Don't load if this was initialized from an ID
			$this->load();
		}
		return $this->mId;
	}

	/**
	 * Set the user and reload all fields according to a given ID
	 * @param $v Int User ID to reload
	 */
	public function setId( $v ) {
		$this->mId = $v;
		$this->clearInstanceCache( 'id' );
	}

	/**
	 * Get the user name, or the IP of an anonymous user
	 * @return String User's name or IP address
	 */
	public function getName() {
		if ( $this->isItemLoaded( 'name', 'only' ) ) {
			# Special case optimisation
			return $this->mName;
		} else {
			$this->load();
			if ( $this->mName === false ) {
				# Clean up IPs
				$this->mName = IP::sanitizeIP( $this->getRequest()->getIP() );
			}
			return $this->mName;
		}
	}

	/**
	 * Set the user name.
	 *
	 * This does not reload fields from the database according to the given
	 * name. Rather, it is used to create a temporary "nonexistent user" for
	 * later addition to the database. It can also be used to set the IP
	 * address for an anonymous user to something other than the current
	 * remote IP.
	 *
	 * @note User::newFromName() has rougly the same function, when the named user
	 * does not exist.
	 * @param $str String New user name to set
	 */
	public function setName( $str ) {
		$this->load();
		$this->mName = $str;
	}

	/**
	 * Get the user's name escaped by underscores.
	 * @return String Username escaped by underscores.
	 */
	public function getTitleKey() {
		return str_replace( ' ', '_', $this->getName() );
	}

	/**
	 * Check if the user has new messages.
	 * @return Bool True if the user has new messages
	 */
	public function getNewtalk() {
		$this->load();

		# 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 $wgMemc;
				$key = wfMemcKey( 'newtalk', 'ip', $this->getName() );
				$newtalk = $wgMemc->get( $key );
				if( strval( $newtalk ) !== '' ) {
					$this->mNewtalk = (bool)$newtalk;
				} else {
					// Since we are caching this, make sure it is…