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<?php
/*
* StatusNet - the distributed open-source microblogging tool
* Copyright (C) 2008, 2009, StatusNet, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
class Nickname
{
/**
* Regex fragment for pulling an arbitrarily-formated nickname.
*
* Not guaranteed to be valid after normalization; run the string through
* Nickname::normalize() to get the canonical form, or Nickname::isValid()
* if you just need to check if it's properly formatted.
*
* This and CANONICAL_FMT replace the old NICKNAME_FMT, but be aware
* that these should not be enclosed in []s.
*/
const DISPLAY_FMT = '[0-9a-zA-Z_]+';
/**
* Regex fragment for checking a canonical nickname.
*
* Any non-matching string is not a valid canonical/normalized nickname.
* Matching strings are valid and canonical form, but may still be
* unavailable for registration due to blacklisting et.
*
* Only the canonical forms should be stored as keys in the database;
* there are multiple possible denormalized forms for each valid
* canonical-form name.
*
* This and DISPLAY_FMT replace the old NICKNAME_FMT, but be aware
* that these should not be enclosed in []s.
*/
const CANONICAL_FMT = '[0-9a-z]{1,64}';
/**
* Maximum number of characters in a canonical-form nickname.
*/
const MAX_LEN = 64;
/**
* Nice simple check of whether the given string is a valid input nickname,
* which can be normalized into an internally canonical form.
*
* Note that valid nicknames may be in use or reserved.
*
* @param string $str
* @return boolean
*/
public static function isValid($str)
{
try {
self::normalize($str);
return true;
} catch (NicknameException $e) {
return false;
}
}
/**
* Validate an input nickname string, and normalize it to its canonical form.
* The canonical form will be returned, or an exception thrown if invalid.
*
* @param string $str
* @return string Normalized canonical form of $str
*
* @throws NicknameException (base class)
* @throws NicknameInvalidException
* @throws NicknameEmptyException
* @throws NicknameTooLongException
*/
public static function normalize($str)
{
$str = trim($str);
$str = str_replace('_', '', $str);
$str = mb_strtolower($str);
$len = mb_strlen($str);
if ($len < 1) {
throw new NicknameEmptyException();
} else if ($len > self::MAX_LEN) {
throw new NicknameTooLongException();
}
if (!self::isCanonical($str)) {
throw new NicknameInvalidException();
}
return $str;
}
/**
* Is the given string a valid canonical nickname form?
*
* @param string $str
* @return boolean
*/
public static function isCanonical($str)
{
return preg_match('/^(?:' . self::CANONICAL_FMT . ')$/', $str);
}
}
class NicknameException extends ClientException
{
function __construct($msg=null, $code=400)
{
if ($msg === null) {
$msg = $this->defaultMessage();
}
parent::__construct($msg, $code);
}
/**
* Default localized message for this type of exception.
* @return string
*/
protected function defaultMessage()
{
return null;
}
}
class NicknameInvalidException extends NicknameException {
/**
* Default localized message for this type of exception.
* @return string
*/
protected function defaultMessage()
{
// TRANS: Validation error in form for registration, profile and group settings, etc.
return _('Nickname must have only lowercase letters and numbers and no spaces.');
}
}
class NicknameEmptyException extends NicknameException
{
/**
* Default localized message for this type of exception.
* @return string
*/
protected function defaultMessage()
{
// TRANS: Validation error in form for registration, profile and group settings, etc.
return _('Nickname cannot be empty.');
}
}
class NicknameTooLongException extends NicknameInvalidException
{
/**
* Default localized message for this type of exception.
* @return string
*/
protected function defaultMessage()
{
// TRANS: Validation error in form for registration, profile and group settings, etc.
return sprintf(_m('Nickname cannot be more than %d character long.',
'Nickname cannot be more than %d characters long.',
Nickname::MAX_LEN),
Nickname::MAX_LEN);
}
}
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